JP2017152164A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of efficiently discharging water when the water flows into a structure for ventilation. A power storage device (1) including an exterior body (10) and a power storage element (100) housed inside the exterior body (10), the exterior body (10) having a ventilation chamber that communicates the inside and the outside of the exterior body (10). The ventilation chamber 60 includes a front wall 63 having a through hole 70 communicating with the outside, a back wall 64 disposed at a position facing the front wall 63, the through hole 70 and the back wall. A first wall 65 arranged between the first wall 65 and a side wall 68b extending along a first direction intersecting the front wall 63 and arranged with a gap 67 between the first wall 65 and the side wall 68b. The gap 67 is formed from the front wall 63 to the back wall 64 along the first direction. [Selection diagram] Fig. 5

Description

  The present invention relates to a power storage device including an exterior body.

  In a power storage device including an exterior body and a power storage element housed inside the exterior body, a configuration for discharging exhaust from a safety valve or the like included in the power storage element to the outside of the exterior body is known.

  For example, the exterior body included in the power storage device described in Patent Document 1 includes a communication portion that connects the internal space and the external space of the exterior body and forms a communication portion that extends in the X-axis direction. The communication unit includes a plurality of shielding plates that are arranged so as to prevent the substance in the communication path from moving in the X-axis direction and to maintain communication through the communication path between the internal space and the external space. As described above, the exterior body has the communication path, so that exhaust from the inside of the exterior body to the outside can be performed, and the plurality of shielding plates are placed in the communication path, so that the exterior body is scattered. It is possible to prevent the incoming foreign matter from entering the internal space of the exterior body.

JP2015-056323A

  For example, in a power storage device mounted on a machine or device used outdoors, when a passage that connects the interior and exterior of the exterior body is provided in the exterior body, water such as rainwater flows into the passage. In some cases, the inflowing water may stay in any place in the exterior body. In this case, the function of the elements included in the power storage device may be impaired by the accumulated water, for example.

  In view of the above-described conventional problems, an object of the present invention is to provide a power storage device that can efficiently discharge water when water flows into a structure for ventilation.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including an exterior body and a power storage element housed in the exterior body. A ventilation chamber that communicates the inside and the exterior of the exterior body is provided, and the ventilation chamber has a front wall in which a through hole that communicates with the outside is formed, and a rear wall that is disposed at a position facing the front wall. A wall, a first wall disposed between the through-hole and the back wall, and a first wall extending in a first direction intersecting the front wall, with a gap between the first wall and the first wall. And the gap is formed from the front wall to the back wall along the first direction.

  According to this configuration, since the exterior body has the ventilation chamber, an excessive increase in the internal pressure of the exterior body is suppressed. Further, since the first wall is arranged on the back side of the through hole (inside the ventilation chamber), even when water flows in from the through hole at a high speed, the momentum is weakened by the first wall. It is done. As a result, the inflow of water into the exterior body through the ventilation chamber is suppressed. Furthermore, since there is a gap formed from the front wall to the back wall between the first wall and the side wall, a fluid passage along the first direction is formed by this gap. Thereby, even if water flows into the ventilation chamber, drainage from the ventilation chamber is promoted.

  Therefore, the power storage device of this aspect is a power storage device capable of efficiently discharging water when water flows into the structure for ventilation.

  In the power storage device according to one embodiment of the present invention, the ventilation chamber further includes a second wall that is disposed between the first wall and the back wall and that forms the gap between the side wall. It is good.

  According to this configuration, since the second wall is further provided in the ventilation chamber, the flow path of the water flowing in from the through hole is limited, and the progress to the back can be reduced. Moreover, since the clearance gap used as the fluid channel | path exists also between a side wall and the 2nd wall, the drainage property is not impaired.

  In the power storage device according to one embodiment of the present invention, the plurality of second walls are arranged in the first direction in the ventilation chamber, and the first wall and the plurality of second walls are arranged. Each of these may be shifted and arranged in a direction crossing the first direction.

  According to this configuration, the presence of three or more walls in the ventilation chamber improves the effect of weakening the momentum of the water flowing in from the through hole. Specifically, three or more walls that are resistant to the fluid flowing into the ventilation chamber from the outside are arranged, and each of the three or more walls arranged in the first direction has a staggered distance from the side wall, for example. Are lined up. That is, the ventilation chamber has a maze structure that forms a zigzag flow path of water, and as a result, the effect of efficiently reducing the momentum of the water that has flowed into the ventilation chamber (for example, the “labyrinth effect”). ) Is played. Further, for example, since gaps (fluid passages) are formed on the left and right sides of three or more walls, the drainage performance of the water that has flowed into the ventilation chamber is improved.

  In the power storage device according to one embodiment of the present invention, at least part of the bottom surface of the vent chamber may have a height difference so that the through hole side is lowered.

  According to this configuration, for example, the water flowing into the ventilation chamber is discharged from the through hole (drainage from the ventilation chamber) more efficiently.

  In the power storage device according to one embodiment of the present invention, the exterior body may further include a vent pipe that is disposed outside the front wall and communicates with the through hole.

  According to this configuration, since the direction of exhaust from the exterior body is restricted to the axial direction of the vent pipe, for example, it is easy to design a machine or device on which the power storage device is mounted in consideration of exhaust processing. Become. In addition, since the flow of water from the exterior of the exterior body toward the through hole is restricted in the axial direction of the vent pipe, the water flowing from the through hole can go to the gap formed between the first wall and the side wall. Can be reduced. That is, the effectiveness of the first wall as a member that obstructs the flow of water flowing from the outside is enhanced.

  In the power storage device according to one embodiment of the present invention, the front wall may include a mesh portion that forms the plurality of through holes.

  According to this configuration, each of the plurality of holes of the mesh portion functions as a through hole for ventilation. Therefore, the entry of relatively large foreign matter through the through hole is suppressed.

  In the power storage device according to one embodiment of the present invention, the ventilation chamber may further include an opening that is disposed at a position that does not overlap the gap in plan view and communicates with the interior of the exterior body.

  According to this configuration, the possibility that the water that has flowed into the ventilation chamber flows into the space in the exterior body in which the power storage element and the like are disposed through the opening for ventilation is reduced.

  In the power storage device according to one embodiment of the present invention, the ventilation chamber may further include a ventilation waterproof film that covers the opening.

  According to this configuration, even if the water that has flowed into the ventilation chamber reaches the position of the opening, the ventilation waterproof film prevents water from entering the exterior body from the opening. be able to.

  Note that the present invention can be realized not only as such a power storage device but also as an exterior body included in the power storage device according to any one of the above aspects.

  According to the power storage device of the present invention, when water flows into the structure for ventilation, the water can be efficiently discharged.

It is a perspective view which shows the external appearance of the electrical storage apparatus which concerns on embodiment. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage apparatus which concerns on embodiment. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage unit which concerns on embodiment. It is a disassembled perspective view which shows the structure outline | summary of the exterior body which concerns on embodiment. It is a partial expansion perspective view which shows the structure outline | summary of the ventilation chamber which the exterior body which concerns on embodiment has. FIG. 6 is a plan view corresponding to FIG. 5. It is a 1st section perspective view showing the internal structure of the ventilation room concerning an embodiment. It is a 2nd cross-sectional perspective view which shows the internal structure of the ventilation chamber which concerns on embodiment. It is sectional drawing which shows the outline | summary of the ventilation structure of the electrical storage apparatus which concerns on the modification 1 of embodiment. It is sectional drawing which shows the outline | summary of the ventilation structure of the electrical storage apparatus which concerns on the modification 2 of embodiment. It is sectional drawing which shows the outline | summary of the ventilation structure of the electrical storage apparatus which concerns on the modification 3 of embodiment. It is sectional drawing which shows the outline | summary of the ventilation structure of the electrical storage apparatus which concerns on the modification 4 of embodiment. It is sectional drawing which shows the outline | summary of the ventilation structure of the electrical storage apparatus which concerns on the modification 5 of embodiment.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Note that each of the embodiments and modifications described below is a specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, the steps in the manufacturing method, the order of the steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Absent. In addition, among the constituent elements in the following embodiments and modifications, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  Each figure in the accompanying drawings is a schematic diagram and is not necessarily illustrated strictly. Furthermore, in each figure, the same code | symbol is attached | subjected about the same or similar component. Further, in the following description of the embodiments, expressions with “substantially” such as approximately half and approximately horizontal may be used. For example, substantially horizontal means not only that it is completely horizontal, but also that it is substantially horizontal, that is, it includes, for example, a difference of about several percent. The same applies to expressions involving other “abbreviations”.

(Embodiment)
First, the configuration of power storage device 1 according to the embodiment will be described.

  FIG. 1 is a perspective view showing an external appearance of a power storage device 1 according to the embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device 1 according to the embodiment is disassembled.

  In these figures, the Z-axis direction is shown as the vertical direction, and the Z-axis direction will be described below as the vertical direction. However, depending on the usage, the Z-axis direction may not be the vertical direction. The axial direction is not limited to the vertical direction. The same applies to the following drawings.

  The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 1 is a battery module used for power storage use, power supply use, and the like. Specifically, the power storage device 1 is used as a battery for starting an engine of a moving body such as an automobile, a motorcycle, a watercraft, a snowmobile, an agricultural machine, and a construction machine. The power storage device 1 can supply power to an external load by itself (single unit) or can be charged from an external power source by itself (single unit). In other words, there is a configuration in which a plurality of battery modules (power storage devices) are connected as a power source for power such as an electric vehicle or a plug-in hybrid electric vehicle and housed in a case to form a battery pack, but the power storage device 1 in the present embodiment is This is different from such a configuration. Note that a battery pack may be configured by electrically connecting a plurality of power storage devices 1 according to an external load or an external power source.

  As shown in FIGS. 1 and 2, the power storage device 1 according to the present embodiment includes an exterior body 10 having a lid 11 and a container 12, a power storage unit 20 accommodated inside the exterior body 10, a holding member 30, and And bus bars 41, 42 and the like.

  The exterior body 10 is a rectangular (box-shaped) structure that constitutes the exterior body of the power storage device 1. That is, the exterior body 10 is disposed outside the power storage unit 20, the holding member 30, and the bus bars 41 and 42, and the power storage unit 20 and the like are disposed at predetermined positions to protect the power storage unit 20 and the like from an impact or the like. . The exterior body 10 is made of an insulating resin material such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polybutylene terephthalate (PBT), or ABS resin. Yes. Thus, the outer package 10 avoids the storage unit 20 and the like from coming into contact with an external metal member or the like.

  The lid 11 included in the outer package 10 is a flat rectangular cover member that closes the opening 12 a of the container 12, and is provided with a positive external terminal 13 and a negative external terminal 14. The power storage device 1 charges electricity from the outside via the positive electrode external terminal 13 and the negative electrode external terminal 14 and discharges electricity to the outside. The container 12 is a bottomed rectangular cylindrical housing having an opening, and houses the power storage unit 20, the holding member 30, the bus bars 41 and 42, and the like.

  The lid 11 and the container 12 may be formed of members of the same material, or may be formed of members of different materials. In addition, although electrical devices such as a circuit board and a relay are disposed inside the lid 11, illustration and description of the electrical devices are omitted.

  Here, the exterior body 10 according to the present embodiment has a structure that allows gas to move between the inside and the outside and prevents the inflow of water from the outside to the inside. That is, the exterior body 10 has a structure that connects the interior and exterior of the exterior body 10. Thereby, the gas inside the exterior body 10 can be discharged to the outside of the exterior body 10. Further, gas outside the exterior body 10 can be taken into the interior of the exterior body 10. The structure for ventilation will be described later with reference to FIGS.

  The power storage unit 20 includes a plurality of power storage elements 100 (in this embodiment, twelve power storage elements 100) and a plurality of bus bars 200, and a positive external terminal 13 and a negative external terminal provided on the lid 11 14 is electrically connected. That is, the positive electrode terminal of any one of the plurality of power storage elements 100 is electrically connected to the positive external terminal 13 via the bus bar 200. In addition, the negative electrode terminal of any one of the plurality of power storage elements 100 is electrically connected to the negative electrode external terminal 14 via the bus bar 200.

  In addition, the power storage units 20 are arranged in the container 12 so as to be arranged in the X-axis direction in a state where the plurality of power storage elements 100 are placed vertically. The power storage unit 20 is accommodated inside the exterior body 10 with the lid 11 covered from above. The detailed configuration of the power storage unit 20 will be described later.

  The holding member 30 holds the bus bars 41 and 42 and other electrical components such as relays and wirings (not shown), insulation between the bus bars 41 and 42 and other members, and the bus bar 41. , 42 and the like. In particular, the holding member 30 positions the bus bars 41 and 42 with respect to the bus bar 200, the positive external terminal 13, and the negative external terminal 14 in the power storage unit 20.

  Specifically, holding member 30 is placed above power storage unit 20 (Z-axis direction plus side) and positioned with respect to power storage unit 20. Further, the bus bars 41 and 42 are placed on the holding member 30 and positioned. The lid 11 is disposed on the holding member 30. Accordingly, the bus bars 41 and 42 are positioned with respect to the bus bar 200 in the power storage unit 20 and the positive external terminal 13 and the negative external terminal 14 provided on the lid 11.

  The holding member 30 is formed of an insulating resin material such as PC, PP, PE, PPS, PBT, or ABS resin. However, the holding member 30 is formed of any material as long as it is an insulating member. It doesn't matter.

  The bus bars 41 and 42 electrically connect the bus bar 200 in the power storage unit 20 to the positive external terminal 13 and the negative external terminal 14 provided on the lid 11. That is, the bus bar 41 is a conductive member that electrically connects the bus bar 200 disposed at one end in the power storage unit 20 and the positive external terminal 13. The bus bar 42 is a conductive member that electrically connects the bus bar 200 disposed at the other end in the power storage unit 20 and the negative electrode external terminal 14.

  The bus bars 41 and 42 are made of, for example, copper as a conductive member, but the material of the bus bars 41 and 42 is not particularly limited. Further, the bus bars 41 and 42 may be formed of members made of the same material, or may be formed of members made of different materials.

  Next, the configuration of the power storage unit 20 will be described in detail.

  FIG. 3 is an exploded perspective view showing each component when the power storage unit 20 according to the embodiment is disassembled.

  As shown in the figure, the power storage unit 20 includes a plurality of power storage elements 100, a plurality of bus bars 200, a plurality of spacers 300, a pair of clamping members 400, a plurality of restraining members 500, a bus bar frame 600, And a heat shield plate 700.

  The power storage element 100 is a secondary battery (unit cell) that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 100 has a flat rectangular shape and is disposed adjacent to the spacer 300. That is, each of the plurality of power storage elements 100 is alternately arranged with each of the plurality of spacers 300 and arranged in the X-axis direction. In the present embodiment, twelve power storage elements 100 are arranged adjacent to eleven spacers 300 alternately. In addition, the electrical storage element 100 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it.

  As shown in the figure, the electricity storage device 100 includes a case 110, a positive electrode terminal 120, and a negative electrode terminal 130. In addition, an electrode body (power generation element), a current collector (a positive electrode current collector and a negative electrode current collector), and the like are disposed inside the case 110, and an electrolytic solution (nonaqueous electrolyte) and the like are enclosed therein. However, detailed description is omitted.

  The case 110 includes a case main body having a rectangular cylindrical shape made of metal and having a bottom, and a metal lid plate that closes the opening of the container main body. In addition, the case 110 has a structure in which after the electrode body and the like are accommodated therein, the inside is sealed by welding the lid plate and the container body. As described above, the case 110 has a rectangular parallelepiped having a cover plate on the positive side in the Z-axis direction, a long side surface on both side surfaces in the X-axis direction, a short side surface on both side surfaces in the Y-axis direction, and a bottom surface on the negative side in the Z-axis direction. It is a container of shape. The material of the case 110 is not particularly limited, but is preferably a weldable metal such as stainless steel, aluminum, or aluminum alloy.

  A safety valve 105 is provided on the cover plate of the case 110. The safety valve 105 is provided in each power storage element 100 as a safety mechanism that opens when the internal pressure of the case 110 rises and releases the gas inside the case 110. Note that not all of the plurality of power storage elements 100 included in the power storage device 1 include the safety valve 105, and it is sufficient that at least one power storage element 100 includes the safety valve 105.

  The positive electrode terminal 120 is an electrode terminal electrically connected to the positive electrode of the electrode body through a positive electrode current collector, and the negative electrode terminal 130 is electrically connected to the negative electrode of the electrode body through a negative electrode current collector. These are connected electrode terminals, both of which are attached to the cover plate of the case 110. That is, the positive electrode terminal 120 and the negative electrode terminal 130 lead the electricity stored in the electrode body to the external space of the power storage element 100, and introduce electricity into the internal space of the power storage element 100 in order to store electricity in the electrode body. This is a metal electrode terminal. In the present embodiment, power storage element 100 is arranged with positive electrode terminal 120 and negative electrode terminal 130 facing upward.

  Bus bar 200 is a conductive member that is electrically connected to each of a plurality of power storage elements 100 in power storage unit 20. That is, the bus bar 200 is a conductive member that is electrically connected to each electrode terminal included in the plurality of power storage elements 100, and electrically connects any one of the electrode terminals included in the plurality of power storage elements 100. Specifically, the bus bar 200 is disposed on the surface of each electrode terminal included in the plurality of power storage elements 100 and connected (joined) to the electrode terminal.

  In the present embodiment, five bus bars 200 are arranged, and twelve power storage elements 100 include four sets of three power storage elements 100 connected in parallel by the five bus bars 200. The configuration is connected in series. In addition, the bus bar 200 disposed at the end is connected to the above-described bus bars 41 and 42, and is thereby electrically connected to the positive external terminal 13 and the negative external terminal 14.

  The bus bar 200 is made of, for example, aluminum as a conductive member, but the material of the bus bar 200 is not particularly limited. Further, the bus bars 200 may all be formed of members of the same material, or any of the bus bars 200 may be formed of members of different materials. Further, the number of bus bars 200, the number of power storage elements 100 connected in parallel, the number of sets of power storage elements 100 connected in series, and the like are not limited to the above.

  The spacer 300 is a plate-like member that is disposed on the side (X-axis direction plus side or minus side) of the electricity storage element 100 and insulates the electricity storage element 100 from other members. For example, the spacer 300 is made of an insulating resin such as PC, PP, PE, PPS, PBT, or ABS resin. That is, the spacer 300 is disposed between two adjacent power storage elements 100 and insulates between the two power storage elements 100. In the present embodiment, eleven spacers 300 are arranged between each of the twelve power storage elements 100. The spacer 300 may be formed of any material as long as it is an insulating member, or may be formed of the same material, or any of the spacers may be made of different materials. It may be formed of any member.

  In addition, the spacer 300 is formed so as to cover approximately half of the front side or back side of the power storage element 100 (substantially half when divided into two in the X-axis direction). In other words, the recesses are formed on both the front side and the back side (both sides in the X-axis direction) of the spacer 300, and approximately half of the power storage element 100 is inserted into the recesses. With such a configuration, the spacer 300 on the side of the power storage element 100 covers most of the power storage element 100, so that the insulating property between the power storage element 100 and another conductive member is covered by the spacer 300. Can be improved.

  The spacer 300 has a spacer protrusion 310 that protrudes upward and engages with the holding member 30. Thereby, even if the holding member 30 tries to move upward, the upward movement of the holding member 30 is suppressed by the spacer protrusion 310 of the spacer 300.

  The clamping member 400 and the restraining member 500 are members that press the power storage element 100 from the outside in the stacking direction of the electrode bodies of the power storage element 100. That is, the sandwiching member 400 and the restraining member 500 press the respective power storage elements 100 included in the plurality of power storage elements 100 from both sides by sandwiching the plurality of power storage elements 100 from both sides in the stacking direction. Note that the stacking direction of the electrode bodies of the power storage element 100 is a direction in which the positive electrode, the negative electrode, and the separator of the electrode body are stacked, and is the same direction as the arrangement direction (X-axis direction) of the plurality of power storage elements 100. That is, the plurality of power storage elements 100 are arranged in the stacking direction.

  Specifically, the clamping member 400 is a flat plate member (end plate) disposed on both sides in the X-axis direction of the plurality of power storage elements 100, and the plurality of power storage elements 100 and the plurality of spacers 300 are connected to the plurality of power storage elements. The element 100 and the plurality of spacers 300 are sandwiched and held from both sides in the arrangement direction (X-axis direction). The sandwiching member 400 is formed of a metal (conductive) member such as steel or stainless steel from the viewpoint of strength or the like, but is not limited thereto, and is formed of an insulating member having high strength, for example. May be. In the case where the sandwiching member 400 is formed of a conductive member, in order to ensure insulation between the sandwiching member 400 and the power storage element 100, between the sandwiching member 400 and the power storage element 100, An insulating member similar to the spacer 300 is disposed.

  The restraining member 500 is a long and flat member (constraint bar) that is attached to the sandwiching member 400 at both ends and restrains the plurality of power storage elements 100. That is, the constraining member 500 is disposed so as to straddle the plurality of power storage elements 100 and the plurality of spacers 300, and is constrained in the arrangement direction (X-axis direction) with respect to the plurality of power storage elements 100 and the plurality of spacers 300. Giving power.

  In the present embodiment, two restraining members 500 are arranged on both sides (Y-axis direction both sides) of the plurality of power storage elements 100, and the plurality of power storage elements 100 are separated from the both sides by the two restraining members 500. Hold and restrain. The restraining member 500 is preferably formed of a metal member such as steel or stainless steel as in the case of the sandwiching member 400, but may be formed of a member other than metal.

  The bus bar frame 600 is a member that can insulate the bus bar 200 from other members and regulate the position of the bus bar 200. In particular, the bus bar frame 600 positions the bus bar 200 with respect to the plurality of power storage elements 100 in the power storage unit 20.

  Specifically, bus bar frame 600 is placed above the plurality of power storage elements 100 (Z-axis direction plus side) and positioned with respect to the plurality of power storage elements 100. In addition, the bus bar 200 is placed and positioned on the bus bar frame 600. As a result, the bus bar 200 is positioned with respect to the plurality of power storage elements 100, and each of the plurality of power storage elements 100 has through the bus bar opening 610 that is a through hole formed in the bus bar frame 600. Bonded to the electrode terminal.

  The bus bar frame 600 is formed of an insulating resin material such as PC, PP, PE, PPS, PBT, or ABS resin. However, the bus bar frame 600 is formed of any material as long as it is an insulating member. It doesn't matter. However, in the present embodiment, the bus bar frame 600 is made of a material having a relatively high rigidity (a material having a higher rigidity than the holding member 30) in order to secure a function of fixing the holding member 30 to the power storage element 100. It is preferable that it is formed.

  The heat shield plate 700 is a plate-like member having heat insulation disposed inside the exhaust passage of the safety valve 105 of each power storage element 100. Specifically, the heat shield plate 700 is disposed above the bus bar frame 600 so as to be positioned above the safety valve of each power storage element 100. In the present embodiment, the safety valves 105 of each of the plurality of power storage elements 100 are arranged on a straight line along the X-axis direction, and the heat shield plate 700 is located above each safety valve 105 and extends in the X-axis direction. It has a long shape.

  The heat shield plate 700 protects electrical equipment such as a circuit board disposed above the power storage unit 20 from the heat of the gas when gas is discharged from the safety valve of the power storage element 100, for example, in the event of an abnormality. In addition, the exterior body 10 is provided with a through hole (described later with reference to FIG. 5 and the like) that communicates the inside and the exterior of the exterior body 10, and the gas that collides with the heat shield plate 700 passes through the exterior through It is guided outside the body 10.

  In this embodiment, the heat shield plate 700 is formed of a metal material such as stainless steel having low thermal conductivity. However, the present invention is not limited to this, and any material that has high heat resistance and low thermal conductivity may be used. For example, it may be formed of a resin such as PPS or PBT reinforced with glass fiber, or ceramic.

  A structure for discharging the gas released from one or more power storage elements 100 to the outside of the exterior body 10 in the power storage device 1 configured as described above will be described with reference to FIGS.

  FIG. 4 is an exploded perspective view showing a configuration outline of the exterior body 10 according to the embodiment. Specifically, in FIG. 4, the exterior body 10 is separated into a lid 11 and a container 12, and the lid 11 is further separated into a lower lid 11a and an upper lid 11b. Further, illustration of other elements such as a plurality of power storage elements 100 accommodated in the exterior body 10 is omitted.

  FIG. 5 is a partially enlarged perspective view showing a configuration outline of the ventilation chamber 60 included in the exterior body 10 according to the embodiment, and FIG. 6 is a plan view corresponding to FIG. 5. 5 and 6, the illustration of the upper lid 11b is omitted, and the first member 91 and the second member 92 are illustrated separately from the ventilation chamber 60. In FIG. 6, the region penetrating the lower lid 11 a is shown with dots so that it can be easily distinguished from other elements.

  As shown in FIGS. 4 to 6, the exterior body 10 according to the present embodiment is provided with a ventilation chamber 60 that communicates the inside and the exterior of the exterior body 10. The ventilation chamber 60 is disposed between the front wall 63 in which the through hole 70 communicating with the outside is formed, the back wall 64 disposed at a position facing the front wall 63, and the through hole 70 and the back wall 64. The first wall 65 and a side wall 68 b that extends along the first direction intersecting the front wall 63 and is disposed with a gap 67 between the first wall 65 and the first wall 65.

  In the present embodiment, the front wall 63 is arranged in a posture parallel to the Y-axis direction, and the first direction coincides with the X-axis direction. Further, in the present embodiment, for example, as shown in FIG. 6, the gap 67 (represented by a thick dotted line in FIG. 6) is formed from the front wall 63 to the back wall 64 along the first direction. Has been. The gap 67 is a linear space as a whole through which the fluid can pass, and can be rephrased as a fluid passage or a fluid straight path.

  In the present embodiment, as shown in FIGS. 5 and 6, the ventilation chamber 60 has three side walls (side walls 68a, 68b, 68c) that extend in the X-axis direction and are aligned in the Y-axis direction. The side walls 68a and 68c at both ends in the Y-axis direction are walls at both ends in the Y-axis direction of the ventilation chamber 60. The bottom surface 69 (a part of the lower lid 11a) and the upper lid 11b are walls in the Z-axis direction (vertical direction) of the ventilation chamber 60. In other words, the ventilation chamber 60 is a space (ventilation space) for ventilation surrounded by the side walls 68a and 68c, the front wall 63, the back wall 64, the bottom surface 69, and the upper lid 11b.

  It can also be said that each of the front wall 63 and the back wall 64 is a side wall (that is, a side wall) in the X-axis direction in the ventilation chamber 60.

  In such a configuration, the ventilation chamber 60 is provided with an opening communicating with the outside of the exterior body 10. Specifically, the ventilation chamber 60 is provided with a first opening 81 and a second opening 82, and each of the first opening 81 and the second opening 82 passes through the through hole 70. The exterior body 10 communicates with the outside.

  That is, power storage device 1 according to the present embodiment includes exterior body 10 having first opening 81 and second opening 82 that communicate with the outside. The power storage device 1 further covers the first opening 91, covers the waterproof and breathable first member 91 and the second opening 82, and the internal pressure of the exterior body 10 exceeds a predetermined pressure. And a second member 92 for releasing the internal pressure.

  Moreover, the electrical storage apparatus 1 can also be expressed as follows. The power storage device 1 includes an exterior body 10 having a lid 11 and a container 12. The lid 11 includes a lower lid 11a that covers an opening 12a of the container 12, an upper lid 11b that is provided on the lower lid 11a, a lower lid 11a, And side walls such as a side wall 68a connecting the upper lid 11b. A ventilation chamber 60 is formed by side walls such as the lower lid 11a, the upper lid 11b, and the side wall 68a, and a through hole 70 that communicates the outside with the ventilation chamber 60 is formed in one side wall. The lower lid 11a covers the first opening 81 and the second opening 82 that communicate the space in the container 12 and the 60 vent chamber 60, and the first opening 81, and has a waterproof and breathable first member. 91 and a second member 92 that covers the second opening 82 and releases the internal pressure when the internal pressure of the exterior body 10 exceeds a predetermined pressure.

  Thus, the exterior body 10 has two openings (first opening 81 and second opening 82), and members having different functions (first member 91 and first opening 91) in the respective openings. By disposing the two members 92), the respective openings can have different functions. In the present embodiment, simply speaking, the first opening 81 degasses the exterior body 10 at the normal time, and the second opening 82 allows the gas from the exterior body 10 in an emergency (emergency). Degassing is done. In addition, the first opening 81 functions not only as an exhaust from the inside of the exterior body 10 to the outside, but also as an opening for intake (intake) of gas from the outside to the inside of the exterior body 10. That is, the first opening 81 has a function (pressure balance function) for reducing the pressure difference between the inside and outside of the exterior body 10 in a normal state.

  Further, when two members having different functions are arranged side by side in one opening, for example, a structure or a manufacturing process may be complicated in order not to generate a gap between the two members. However, in the present embodiment, since the member for closing each of the first opening 81 and the second opening 82 is disposed, the above-described normal gas venting function, pressure balancing function, and emergency (emergency) The gas storage function (internal pressure control function) is provided in the power storage device 1 with a relatively simple structure or manufacturing process.

  Specifically, in the present embodiment, the first member 91 is a sheet-like member, and more specifically, a film (breathable waterproof film) having a function of allowing gas to pass and not allowing liquid to pass. is there. The first member 91 is a film made of a waterproof and moisture-permeable material having waterproofness and air permeability (moisture permeability) such as Gore-Tex (registered trademark) and TEMISH (registered trademark).

  In the present embodiment, the second member 92 is a sheet-like member, and more specifically, a film having a function of preventing gas and liquid from passing therethrough. The second member 92 is a member that releases (depressurizes) the pressure when the pressure inside the exterior body 10 exceeds a predetermined pressure. As a material of the second member 92, for example, a resin film, a metal foil, or the like is employed.

  The sheet-like first member 91 is joined to the periphery of the first opening 81, and the sheet-like second member 92 is joined to the periphery of the second opening 82. For this bonding, for example, an adhesive, a pressure-sensitive adhesive, a double-sided pressure-sensitive adhesive tape, or the like can be used. Moreover, this joining may be performed by welding. Therefore, each of the first member 91 and the second member 92 can be arranged relatively easily.

  As described above, in the power storage device 1 according to the present embodiment, the pressure difference between the inside and the outside of the exterior body 10 in the normal state is caused by the first opening 81 and the through holes 70 (a plurality of through holes 70 in the present embodiment). It is reduced by the gas coming and going through. Further, for example, when the internal pressure of the exterior body 10 suddenly increases, such as when gas is ejected from the safety valve 105 of any one of the energy storage devices 100, the second member 92 can be peeled off to open the second opening 82. Thus, the increased internal pressure of the exterior body 10 is reduced. As a result, for example, destruction of the exterior body 10 due to excessive increase in the internal pressure of the exterior body 10 is prevented.

  Further, in the present embodiment, as shown in FIG. 6, the second member 92 is connected to the open valve portion 92a joined to the peripheral edge of the second opening portion 82 and the open valve portion 92a. And a fixing portion 92b fixed to the outer portion.

  That is, the release valve portion 92a is a portion that directly receives the internal pressure of the exterior body 10, and when the internal pressure of the exterior body 10 exceeds a predetermined internal pressure, the release valve portion 92a starts from the periphery of the second opening portion 82. As a result, the internal pressure of the exterior body 10 is reduced. Further, in this case, since the pressure that worked in the direction of peeling the open valve portion 92a with respect to the open valve portion 92a is almost eliminated, the state where the fixed portion 92b is fixed to the outer portion of the peripheral edge is maintained.

  Therefore, for example, even when the release valve portion 92a is peeled off so as to open the second opening portion 82 due to a rapid increase in the internal pressure of the exterior body 10, the second member 92 is fixed by the fixing portion 92b. The position of Thereby, the possibility that the second member 92 hinders the release of gas from the inside of the exterior body 10 to the outside is reduced, for example.

  Note that the attachment strength of the second member 92 to the second opening 82 may be lower than the attachment strength of the first member 91 to the first opening 81. In this case, the second member 92 is easily detached from the second opening 82 because the attachment strength is low. Therefore, when the internal pressure of the exterior body 10 increases rapidly, the effectiveness of the second member 92 having a function of releasing the internal pressure is improved.

  In addition, the attachment strength of each of the first member 91 and the second member 92 is, for example, the amount, type, and plan view of the adhesive to be bonded to the exterior body 10 (the same applies when viewed from the Z-axis direction plus side). It can be adjusted by changing the area or application position. For example, the bonding of the first member 91 to the periphery of the first opening 81 (first bonding) and the bonding of the second member 92 to the periphery of the second opening 82 (second bonding) are the same type. It is assumed that the adhesive is used. In this case, the amount of the adhesive used for the second bonding is made smaller than the amount of the adhesive used for the first bonding. Thereby, the attachment strength of the second member 92 to the second opening 82 is lower than the attachment strength of the first member 91 to the first opening 81.

  For example, when each of the first member 91 and the second member 92 is joined to the exterior body 10 by welding, the first member 91 and the second member 92 are changed by changing the welding area or the welding position in a plan view. It is also possible to adjust the mounting strength.

  Further, as a method for comparing the mounting strength, for example, a tensile test on the first member 91 and the second member 92 is exemplified. That is, the member connected to the first member 91 and the second member 92 by a technique such as adhesion or adsorption is the side on which the first member 91 and the second member 92 are joined (in this embodiment, the Z axis direction plus side). Pull on). As a result, it can be determined that the attachment strength of the first member 91 and the second member 92 that is first removed from the exterior body 10 is low. Moreover, the attachment strength between the 1st member 91 and the 2nd member 92 can also be compared by measuring and comparing the tension | tensile_strength required for each removal of the 1st member 91 and the 2nd member 92. FIG.

  Here, when the power storage device 1 is mounted on a machine or device used outdoors, such as an automobile, water such as rainwater may reach the through hole 70 provided in the ventilation chamber 60. . That is, there is a possibility that water such as rainwater flows into the ventilation chamber 60. In particular, when the machine or device on which the power storage device 1 is mounted is exposed to severe wind and rain, there is a possibility that water may flow into the ventilation chamber 60 with a strong momentum.

  However, in the ventilation chamber 60 according to the present embodiment, the first wall 65 is disposed on the back side of the through hole 70 (inside the ventilation chamber 60), so that water flows from the through hole 70 at a high speed. Even in that case, the momentum is weakened by the first wall 65. As a result, the inflow of water into the exterior body 10 (the space in which the power storage element 100 and the like are accommodated) via the ventilation chamber 60 is suppressed.

  Even if the water that has flowed into the ventilation chamber 60 reaches the position of the first opening 81 and the second opening 82, the first member 91 and the second member 92 do not allow water to pass through. Since it has a function, the inflow of the water from the 1st opening part 81 and the 2nd opening part 82 to the inside of the exterior body 10 is prevented.

  Here, for example, when water flowing into the ventilation chamber 60 from the outside is stored on the first member 91, the function of the first member 91 as the ventilation waterproof film may be impaired. For example, when the situation where the 2nd member 92 is immersed in water arises, there exists a possibility that the deficiency may arise in operation | movement (opening | release at the time of the internal pressure rise of the exterior body 10) of the 2nd member 92.

  However, in the present embodiment, there is a gap 67 formed from the front wall 63 to the back wall 64 between the first wall 65 and the side wall 68b, and this gap 67 causes the first direction (X-axis). A fluid passage along the direction) is formed. Thereby, even if water flows into the ventilation chamber 60, drainage from the ventilation chamber 60 is promoted. As a result, the possibility of occurrence of problems due to the water being stored in the ventilation chamber 60 is reduced.

  In addition, the ventilation chamber 60 basically has a simple structure composed of a plurality of walls, so that the resistance to the inflowing water can be increased and the discharge of the inflowing water can be promoted. That is, since the vent chamber 60 allows the exhaust from the inside of the exterior body 10 to the outside, while allowing the inflow of water from the outside to the inside of the vent chamber 60, the comparatively simple structure, The discharge of the inflowing water from the ventilation chamber 60 is promoted.

  In the present embodiment, the axis of the through hole 70 (virtual straight line passing through the center of the hole or opening and parallel to the through direction, the same applies hereinafter), the first opening 81 and the second opening 82. If we focus on the axis, the following can be said.

  The exterior body 10 is provided with a ventilation chamber 60 in which a first opening 81 and a second opening 82 and a through hole 70 communicating with the outside are disposed. The first opening 81 and the second opening 82 are arranged at positions that communicate with the outside through the through hole 70. In such a structure, the axial direction of the first opening 81 is the first axial direction, the axial direction of the second opening 82 is the second axial direction, and the axial direction of the through hole 70 is the third axial direction. And In this case, the first axis direction and the second axis direction intersect with the third axis direction.

  Specifically, in the present embodiment, both the first axis direction and the second axis direction are the Z-axis direction, and the third axis direction is the X-axis direction. That is, the first axis direction and the second axis direction are in a relationship intersecting with the third axis direction.

  Therefore, even if water flows in from the through hole 70 at a high speed, the direction of the axis of the through hole 70 and the opening disposed in the vent chamber 60 (in the present embodiment, the first opening) 81 and the direction of the axis of the second opening 82) intersects with each other, so that, in terms of structure, the opening (in this embodiment, the first opening 81 and the second opening 82) has an axis of the opening. The possibility of water coming from the direction is reduced. That is, the possibility that water is directed toward the opening from a direction that easily passes through the opening is reduced.

  Note that it is sufficient that at least one of the first axis direction and the second axis direction intersects the third axis direction. Thereby, about at least one of the 1st opening part 81 and the 2nd opening part 82 corresponding to the said at least one, possibility that the water which flowed into the ventilation chamber 60 will come toward from an axial direction is reduced.

  Further, it is not necessary that both the first opening 81 and the second opening 82 are disposed in the ventilation chamber 60, and one of the first opening 81 and the second opening 82 is the ventilation chamber of the exterior body 10. It may be arranged in a part different from 60. Even in this case, the axial direction (first axial direction or second axial direction) of the opening disposed in the ventilation chamber 60 intersects the axial direction (third axial direction) of the through hole 70. By being, the possibility that water will approach the opening from the axial direction of the opening is reduced. An example of a structure in which one of the first opening 81 and the second opening 82 is disposed other than the ventilation chamber 60 will be described later as a fourth modification.

  In the present embodiment, the ventilation chamber 60 further includes a second wall 66 that is disposed between the first wall 65 and the back wall 64 and that forms a gap 67 between the side wall 68b.

  As described above, the second wall 66 is further provided in the ventilation chamber 60, whereby the momentum of the water flowing from the through hole 70 is further weakened. Moreover, since the clearance gap 67 used as the fluid passage exists also between the side wall 68b and the 2nd wall 66, the good drainage property is not impaired.

  More specifically, a plurality of second walls 66 are arranged side by side in the first direction (X-axis direction) in the ventilation chamber 60. In the present embodiment, the two second walls 66 are arranged side by side in the X-axis direction between the first wall 65 and the back wall 64. Furthermore, each of the first wall 65 and the plurality of second walls 66 is shifted and arranged in a direction intersecting the first direction (X-axis direction). Specifically, the three walls (the first wall 65 and the two second walls 66) are alternately shifted to the plus side and the minus side in the Y-axis direction. That is, in plan view, the first wall 65 and the two second walls 66 are arranged in a zigzag manner, and a fluid straight path (gap 67) is secured.

  In other words, in the present embodiment, three walls serving as resistance to water flowing into the ventilation chamber 60 from the outside are arranged, and each of the three walls arranged in the X-axis direction has a distance from the side wall 68b, for example. They are arranged in a staggered manner. That is, when the direction of the back wall 64 is viewed from the through hole 70 side, for example, the right end of one of the two walls adjacent in the front-rear direction (X-axis direction) is the right of the other wall. It protrudes to the right side of the end of. Further, for example, the positional relationship between the side wall and each wall, the distance in the Y axis direction to the side wall of each of the plurality of walls adjacent in the X axis direction is large or small. In the present embodiment, the first wall 65 and the two second walls 66 are arranged such that the distance from the side wall 68c is in the order of large, small, and large.

  Therefore, the behavior of the water flowing in from the through hole 70 is described as follows, for example. Most of the water that has flowed in through the through hole 70 and collided with the first wall 65 has a larger gap between the left and right gaps of the first wall 65 (in this embodiment, as viewed from the through hole 70. However, the momentum of the water is considerably reduced at the time of the collision. Note that the momentum of the water that has flowed into the gap having the smaller width (in this embodiment, the gap on the right side when viewed from the through hole 70) is further reduced.

  The water flowing into the gap on the left side of the first wall 65 collides with the second wall 66 due to the presence of the second wall 66 on the traveling path, and the momentum is further weakened. In addition, most of the water that has collided with the second wall 66 is guided to the larger gap (the right gap as viewed from the through hole 70 in this embodiment) of the left and right gaps of the second wall 66. It is burned. In this way, the water that has flowed from the through hole 70 roughly collides with the wall, progresses to the larger one of the left and right gaps of the wall, collides with the wall located on the traveling path, Meandering left and right while

  That is, the ventilation chamber 60 has a maze structure that forms a zigzag-shaped water flow path, and as a result, an effect (labyrinth effect) of efficiently reducing the momentum of the water flowing into the ventilation chamber 60 is achieved. The

  In addition, it is not essential that the plurality of walls in the ventilation chamber 60 are shifted in the direction intersecting the first direction (X-axis direction). That is, for example, the central axes of the plurality of walls in the Y-axis direction may coincide. In this case, for example, even if the second wall 66 located at the back of the first wall 65 is formed in a position and size hidden by the first wall 65 when viewed from the through hole 70 side. Good. Even in this case, after colliding with the first wall 65, at least part of the water that has flowed from the left or right of the first wall 65 to the back side (the second wall 66 side) is caused by the second wall 66. The movement in the direction of the back wall 64 is hindered. Thereby, compared with the case where the 2nd wall 66 is not arrange | positioned, the momentum of the water which flowed into the ventilation chamber 60 can be reduced more.

  Further, from the viewpoint of suppressing the intrusion of water into the exterior body 10 through the ventilation chamber 60, when the second wall 66 located behind the first wall 65 is viewed from the through hole 70 side. The first wall 65 is preferably formed at a position and size that protrude from both the left and right sides. In this case, the water guided to the left and right gaps of the first wall 65 after colliding with the first wall 65 moves in the direction of the back wall 64 because the second wall 66 exists on the traveling path. Is disturbed. Accordingly, it is possible to efficiently reduce the momentum of water that travels through both the left and right sides of the first wall 65.

  Further, in the ventilation chamber 60 according to the present embodiment, for example, as shown in FIG. 6, a gap is formed between the three walls and the left and right side walls (side wall 68b and side wall 68c). Therefore, the drainage of the water that has flowed into the ventilation chamber 60 is improved.

  In the present embodiment, as shown in FIGS. 5 and 6, the ventilation chamber 60 includes the first ventilation chamber 61 in which the first opening 81 and the second opening 82 are disposed, and the through hole 70. Second vent chamber 62 formed. Specifically, the ventilation chamber 60 is partitioned into a first ventilation chamber 61 and a second ventilation chamber 62 by a side wall 68b, and the side wall 68b is a flow of water from the second ventilation chamber 62 to the first ventilation chamber 61. Functions as an obstructing member. Therefore, the reachability of the water flowing from the through hole 70 to the first opening 81 and the second opening 82 is reduced. That is, the possibility of water intrusion through the first opening 81 or the second opening 82 is reduced.

  As shown in FIGS. 5 and 6, there is a gap between the side wall 68 b and the front wall 63. Therefore, for example, even when water that flows in at a high speed from the through hole 70 reaches the first ventilation chamber 61 through the gap 67 between the side wall 68b and the first wall 65, A gap between the wall 63 functions as a short circuit for drainage. That is, drainage from the first ventilation chamber 61 is efficiently performed.

  In addition, both the 1st opening part 81 and the 2nd opening part 82 do not need to be arrange | positioned in the 1st ventilation chamber 61, for example, either one of the 1st opening part 81 and the 2nd opening part 82 is, The second ventilation chamber 62 or the exterior body 10 may be disposed at a position other than the ventilation chamber 60. In any case, the possibility of reaching the water flowing from the through hole 70 to at least one of the first opening 81 and the second opening 82 disposed in the first ventilation chamber 61 is reduced.

  Further, in the present embodiment, for example, as shown in FIGS. 5 and 6, the exterior body 10 further includes a vent pipe 15 that is disposed outside the front wall 63 and communicates with the through hole 70.

  According to this configuration, the direction of exhaust from the exterior body 10 is restricted to the axial direction of the vent pipe 15, and thus, for example, a design in consideration of exhaust processing for a machine or device on which the power storage device 1 is mounted. Becomes easy.

  In addition, since the flow of water from the exterior of the exterior body 10 toward the through hole 70 is restricted in the axial direction of the vent pipe 15, the water flowing from the through hole 70 is formed between the first wall 65 and the side wall 68b. The possibility of going to the formed gap 67 can be reduced. That is, the effectiveness of the first wall 65 as a member that inhibits the flow of water flowing from the outside is enhanced.

  For example, as shown in FIG. 5, a mesh portion 75 that forms a plurality of through holes 70 is provided on the front wall 63 of the ventilation chamber 60. That is, each of the plurality of holes having a relatively small opening area included in the mesh portion 75 functions as a through hole 70 for ventilation. Therefore, the entry of relatively large foreign matter through the through hole 70 is suppressed.

  Note that the mesh portion 75 may be formed integrally with the front wall 63, for example, in the step of forming the front wall 63, and the front wall 63 and the front wall 63 are formed in one relatively large through hole of the front wall 63. A plurality of through holes may be formed in the front wall 63 by arranging the separate mesh portion 75.

  Here, in the present embodiment, the ventilation chamber 60 includes two openings (the first opening 81 and the second opening 82) that communicate with the interior of the exterior body 10. In plan view, they are arranged at positions that do not overlap the gaps 67.

  Therefore, the possibility that water that has flowed into the ventilation chamber 60 flows into the space in the exterior body 10 in which the power storage element 100 and the like are disposed via the first opening 81 and the second opening 82 is reduced. Is done.

  In the present embodiment, the ventilation chamber 60 has both the first opening 81 and the second opening 82, and in the ventilation chamber 60, the first member 91 is a through hole rather than the second member 92. It is arranged at a position far from 70. More specifically, in the fluid path length, the distance from the through hole 70 closest to one of the first member 91 and the second member 92 among the plurality of through holes 70 to the first member 91. However, the distance from the through hole 70 to the second member 92 is longer.

  Therefore, for example, water that has flowed into the ventilation chamber 60 from the outside via the through hole 70 is difficult to reach the first member 91. As a result, the possibility of water flowing into the exterior body 10 from the first opening 81 is reduced. Specifically, for example, the possibility of occurrence of water leakage or the like through the first member 91 due to the first member 91 being immersed in water is reduced.

  In addition, the bottom surface 69 of the vent chamber 60 according to the present embodiment has a height difference at least in part, so that the water flowing into the vent chamber 60 can be efficiently discharged. This will be described with reference to FIGS.

  FIG. 7 is a first cross-sectional perspective view showing the internal structure of the vent chamber 60 according to the embodiment, and FIG. 8 is a second cross-sectional perspective view showing the internal structure of the vent chamber 60 according to the embodiment. is there. Specifically, FIG. 7 is a diagram showing the ventilation chamber 60 cut along a plane parallel to the YZ plane, and FIG. 8 is a diagram showing the ventilation chamber 60 cut along a plane parallel to the XZ plane. It is. 7 and 8, the container 12 of the outer package 10 is not shown.

  In the present embodiment, as shown in FIGS. 7 and 8, at least a part of the bottom surface 69 of the ventilation chamber 60 has a height difference so that the through hole 70 side is lowered. Thereby, for example, the water flowing into the ventilation chamber 60 is discharged from the through hole 70 (drainage from the ventilation chamber 60) more efficiently.

  Specifically, as shown in FIG. 7, the bottom surface 69 of the first ventilation chamber 61 in which the first opening 81 and the second opening 82 are formed is the second ventilation chamber in which the through hole 70 is formed. It inclines so that it may become low toward 62. FIG. Therefore, the water that flows into the first ventilation chamber 61 is easily returned to the second ventilation chamber 62, and as a result, drainage through the through hole 70 formed in the second ventilation chamber 62 is promoted.

  In addition, as shown in FIG. 8, a part of the second ventilation chamber 62 in which the through hole 70 is formed is inclined so as to become lower toward the front wall 63 in which the through hole 70 is formed. Therefore, the water flowing into the second ventilation chamber 62 from the through hole 70 and the water returning from the first ventilation chamber 61 easily reach the front wall 63, and as a result, the penetration formed in the front wall 63. Drainage through the hole 70 is encouraged.

  In the present embodiment, the mesh portion 75 that forms the plurality of through holes 70 has the through holes 70 at the height of the bottom surface 69 as shown in FIG. It is possible to discharge most of the water flowing into the ventilation chamber 60.

  Further, when attention is paid to the height positions of the first member 91 and the second member 92, the following features are provided. That is, the ventilation chamber 60 has both the first opening 81 and the second opening 82 and is located above the bottom surface of the exterior body 10. In the ventilation chamber 60, the first member 91 is , Located above the second member 92. Specifically, as shown in FIG. 7, the first opening 81 is at a higher position (the positive side in the Z-axis direction) than the second opening 82, and therefore, the first opening 81 blocks the first opening 81. The one member 91 is disposed at a position higher than the second member 92 that closes the second opening 82.

  Therefore, in the general use posture of the power storage device 1, the first member 91 having higher air permeability than the second member 92 is present at a relatively high position. For this reason, for example, even when external water flows into the ventilation chamber 60, the possibility of occurrence of water leakage or the like via the first member 91 due to the first member 91 being immersed in water is reduced.

  Further, the power storage device 1 has a ventilation structure different from the ventilation chamber 60 shown in FIGS. 4 to 8 as a structure (venting structure) for ventilation from one of the inside and the outside of the exterior body 10 to the other. Also good. Therefore, hereinafter, a modified example related to the ventilation structure of the exterior body 10 according to the embodiment will be described focusing on differences from the above embodiment.

(Modification 1)
FIG. 9 is a cross-sectional view illustrating an outline of the ventilation structure of the power storage device 1a according to the first modification of the embodiment. Note that FIG. 9 illustrates a state in which the exterior body 10a included in the power storage device 1a is cut along a plane parallel to the XY plane at the position of the ventilation structure including the first opening 81, the second opening 82, and the like. . Further, the shape of the exterior body 10a is illustrated in a simplified manner so that the feature appears, and the holding member 30, the bus bar 41, and the like are not illustrated. These supplementary matters regarding FIG. 9 also apply to FIGS.

  The power storage device 1a shown in FIG. 9 includes an exterior body 10a having a first opening 81 and a second opening 82, each of which communicates with the outside. The power storage device 1a further covers the first opening, covers the waterproof and breathable first member 91 and the second opening 82, and the pressure inside the exterior body 10a exceeds a predetermined pressure. And a second member 92 for releasing the internal pressure. That is, the power storage device 1a according to the present modification is common to the power storage device 1 according to the embodiment with respect to the above structure.

  However, the power storage device 1a according to the present modification does not have a component that can be clearly distinguished from other parts, such as a ventilation chamber (venting space).

  Even in this case, the first member 91, which is a breathable waterproof film, is disposed in the first opening 81 of the exterior body 10a, and gas and liquid are supplied to the second opening 82 of the exterior body 10a. By disposing the second member 92 that is not allowed to pass therethrough, each opening can have a different function. Specifically, the first opening 81 allows the gas to be released from the outer casing 10a in a normal state and the pressure balance inside and outside the outer casing 10a, and the second opening 82 allows the outer casing in an emergency (emergency). Degassing from 10a is performed.

  Compared to the case where two members having different functions are arranged side by side in one opening, the internal pressure control function in the normal time and emergency (emergency) is relatively simple in structure or manufacturing. In the process, the power storage device 1a is provided.

(Modification 2)
FIG. 10 is a cross-sectional view illustrating an outline of the ventilation structure of the power storage device 1b according to the second modification of the embodiment. In the power storage device 1b shown in FIG. 10, the exterior body 10b is provided with a ventilation chamber 60a in which a first opening 81 and a second opening 82 and a through hole 70 communicating with the outside are arranged. The first opening 81 and the second opening 82 are arranged at positions that communicate with the outside through the through hole 70. In this structure, the direction of the axis of the first opening 81 (first axis 81a) is the first axis, the direction of the axis of the second opening 82 (second axis 82a) is the second axis, and the through hole The direction of the 70 axis line (third axis line 70a) is defined as the third axis direction. In this modification, the first axis direction and the second axis direction are both Z-axis directions, and the third axis direction is the X-axis direction. In this case, the first axis direction and the second axis direction intersect with the third axis direction. That is, the power storage device 1b according to the present modification is common to the power storage device 1 according to the embodiment with respect to the above structure.

  However, in the power storage device 1b according to this modification, walls such as the first wall 65 and the second wall 66 are not arranged in the ventilation chamber 60a. Even in this case, the direction of the axis of the through hole 70 and the direction of the axes of the openings (the first opening 81 and the second opening 82 in this modification) intersect with the ventilation chamber 60a. Therefore, even if water flows in from the through hole 70 at a high speed, the possibility that the water is directed toward the opening from the axial direction of the opening is reduced due to the structure.

  In the present modification, each of the first axis direction and the second axis direction has a relationship of 90 ° with the third axis direction, but this is not essential. For example, it is assumed that the first axis direction and the third axis direction are not parallel and the angle formed by the first axis direction and the third axis direction is not 90 °. Even in this case, since the first axial direction and the third axial direction intersect, even if water flows in from the through hole 70 at a high speed, the first opening 81 has water from the first axial direction. Is less likely to come.

(Modification 3)
FIG. 11 is a cross-sectional view illustrating an outline of the ventilation structure of the power storage device 1c according to the third modification of the embodiment. In the power storage device 1c shown in FIG. 11, the exterior body 10c is provided with a ventilation chamber 60b in which a first opening 81 and a second opening 82 and a through hole 70 communicating with the outside are arranged. Further, the first opening 81 and the second opening 82 are arranged at positions that communicate with the outside through the through hole 70. That is, the power storage device 1c according to the present modification is common to the power storage device 1 according to the above-described embodiment with respect to the above structure.

  However, in the power storage device 1 c according to this modification, the first axis 81 a and the second axis 82 a that are the axes of the first opening 81 and the second opening 82 are the same as the third axis 70 a that is the axis of the through hole 70. Parallel. That is, as shown in FIG. 11, each of the first axis 81a and the second axis 82a is parallel to the X-axis direction, like the third axis 70a, and each of the first axis 81a and the second axis 82a. The third axis 70a does not overlap in the three-dimensional space. In this respect, it differs from the power storage device 1 according to the above embodiment.

  According to this configuration, even when water flows in at a high speed from the through hole 70, the third axis 70a, the axis, the first axis 81a, and the second axis 82a do not overlap. The possibility that water will approach the first opening 81 and the second opening 82 from the axial direction of the opening is reduced.

  It should be noted that at least one of the first axis 81a and the second axis 82a may be in a relationship parallel to the third axis 70a. Thereby, about the at least one of the 1st opening part 81 and the 2nd opening part 82 corresponding to the said at least one, possibility that the water which flowed in from the through-hole 70 will come from an axial direction is reduced.

  Further, one of the first opening 81 and the second opening 82 may be arranged at a position different from the ventilation chamber 60b of the exterior body 10c. Even in this case, since the axis (the first axis 81a or the second axis 82a) of the opening disposed in the ventilation chamber 60b is parallel to the third axis 70a of the through hole 70, the opening The possibility of water coming from the axial direction is reduced.

  In FIG. 11, the back wall 64 in which the first opening 81 and the second opening 82 are disposed may have a convex shape on the X axis direction plus side or minus side. In this case, the first axis 81a and the second axis 82a are inclined in the XY plane, for example, so that the direction of the first axis 81a (first axis direction) and the direction of the second axis 82a (second axis direction) are It intersects with the direction of the third axis 70a (the third axis direction). Therefore, as described in Modification 2 above, even if water flows in from the through hole 70 at a high speed, the first opening 81 and the second opening 82 are structurally provided with each of the openings. The possibility of water coming from the axial direction is reduced.

(Modification 4)
FIG. 12 is a cross-sectional view illustrating an outline of the ventilation structure of the power storage device 1d according to Modification 4 of the embodiment. In the power storage device 1d shown in FIG. 12, the exterior body 10d is provided with a first opening 81 and a second opening 82, and a through hole 70 communicating with the outside. The first opening 81 and the through hole 70 are disposed in the ventilation chamber 60c of the exterior body 10d. That is, the power storage device 1d according to the present modification has the same structure as the power storage device 1 according to the above embodiment.

  However, in the power storage device 1d according to the present modification, the second opening 82 is not disposed in the ventilation chamber 60c but is disposed on one side wall portion of the exterior body 10d. Even in this case, the direction of the third axis 70a of the through hole 70 (third axis direction) and the direction of the first axis 81a of the first opening 81 disposed in the ventilation chamber 60c (first axis direction). Therefore, even if water flows in from the through hole 70 at a high speed, the possibility of water from the first axial direction toward the first opening 81 is reduced due to the structure.

  Note that, as in Modification 3, the first opening 81 may be disposed in the vent chamber 60c so that the first axis 81a is parallel to the third axis 70a. Even in this case, the possibility that water will approach the first opening 81 from the first axial direction is reduced.

  Alternatively, the second opening 82 may be disposed in the ventilation chamber 60c, and the first opening 81 may be disposed in a portion other than the ventilation chamber 60c of the exterior body 10d. In this case, the second opening 82 is arranged so that the direction of the second axis 82a (second axis direction) and the third axis direction intersect with each other, so that the water flowing from the through hole 70 can be The possibility of coming to the opening 82 from the second axial direction is reduced. Further, as in the third modification, the second opening 82 is disposed in the ventilation chamber 60c so that the second axis 82a is parallel to the third axis 70a, so that the second opening 82 has a second axis 82a. The possibility of water coming from the axial direction is reduced.

  Here, for example, it is considered that the first member 91 is a breathable waterproof film having air permeability, and the second member 92 is a member having no air permeability (or lower air permeability than the first member 91). Then, it can be said that it is more advantageous to arrange the first opening 81 (and the first member 91) in the ventilation chamber 60c from the viewpoint of reducing the possibility of intrusion of external water into the exterior body 10d.

  On the other hand, for example, considering that high-temperature gas is discharged from the second opening 82, the second opening 82 (and the second member 92) is used from the viewpoint of reducing the momentum and heat of the high-temperature gas. It can be said that it is more advantageous to arrange this in the ventilation chamber 60c.

  In this modification, the through hole 70 and the second opening 82 are disposed on the same side wall of the exterior body 10d. However, the through hole 70 and the second opening 82 are formed on different side walls. You may arrange. For example, the arrangement position of the second opening 82 in the exterior body 10d may be determined according to the position where the component or the structure for processing the hot gas ejected from the second opening 82 is arranged.

(Modification 5)
FIG. 13 is a cross-sectional view showing an outline of the ventilation structure of power storage device 1e according to Modification 5 of the embodiment.

  In the power storage device 1e shown in FIG. 13, the exterior body 10e is provided with a ventilation chamber 60d in which a first opening 81 and a second opening 82 and a through hole 70 communicating with the outside are arranged. The first opening 81 and the second opening 82 are arranged at positions that communicate with the outside through the through hole 70. That is, the power storage device 1e according to the present modification is common to the power storage device 1 according to the embodiment with respect to the above structure.

  However, in the power storage device 1e according to the present modification, only the first wall 65 is provided between the through hole 70 and the back wall 64. That is, a wall like the second wall 66 is not disposed between the first wall 65 and the back wall 64. Further, in this modification, the exterior body 10e is not provided with the mesh portion 75 that forms the plurality of through holes 70, and only one through hole 70 is formed. Even in this case, since the first wall 65 is arranged on the back side (the inner side of the exterior body 10 e) from the through hole 70, the water flowing in from the through hole 70 collides with the first wall 65. The momentum is weakened. As a result, the possibility that the water flowing in from the through hole 70 reaches the openings (the first opening 81 and the second opening 82 in the present modification) that are disposed in the ventilation chamber 60d is reduced.

  In the present modification, the exterior body 10 e includes a side wall 68 b that extends along a first direction (X-axis direction) that intersects the front wall 68. Between the side wall 68b and the first wall 65, there is a gap 67 (represented by a thick dotted line in FIG. 13) from the front wall 63 to the back wall 64 along the first direction (X-axis direction). The fluid passage along the first direction (X-axis direction) is formed by the gap 67. Thereby, even if water flows into the ventilation chamber 60d, drainage from the ventilation chamber 60d is promoted. As a result, the possibility of occurrence of problems due to the water being stored in the ventilation chamber 60d is reduced.

(Other embodiments)
The power storage device according to the embodiment of the present invention and the modification thereof has been described above, but the present invention is not limited to the above-described embodiment and the modification. In other words, it should be considered that the embodiment and its modification disclosed this time are illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. In addition, embodiments constructed by arbitrarily combining the constituent elements included in the above-described embodiment and its modifications are also included in the scope of the present invention.

  For example, in the ventilation chamber 60 according to the above embodiment, the gap 67 formed from the front wall 63 to the back wall 64 along the first direction (X-axis direction) is the first wall 65 and the XZ plane. Is formed between the side wall 68b and the side wall 68b. However, the gap 67 forming the fluid passage may be formed between the first wall 65 and the other side wall.

  For example, it can be said that a part of the lower lid 11 a forming the bottom surface 69 of the ventilation chamber 60 is a wall (side wall) located on the negative side of the first wall 65 in the Z-axis direction. That is, even if there is a gap 67 formed from the front wall 63 to the back wall 64 along the first direction between the first wall 65 and the side wall forming the bottom surface 69 of the ventilation chamber 60. Good. That is, the gap 67 may be formed below the first wall 65 (Z-axis direction minus side). In this case, for example, only a part of the first wall 65 is connected to the bottom surface 69, or the first wall 65 is connected to the side wall 68b or the upper lid 11b, so that the first wall 65 is connected to the ventilation chamber. 60 can be fixed in place.

  In the present embodiment, for example, as shown in FIG. 6, a plurality of walls (one first wall 65 and two second walls 66) have a side wall 68 c opposite to the first ventilation chamber 61. There is also a gap formed between the front wall 63 and the back wall 64 along the first direction, but this gap is not essential. For example, at least one of the first wall 65 and the second wall 66 may be connected to the side wall 68c. That is, a gap is formed between the first wall 65 and at least one of the left, right, and right side walls below the first wall 65 from the front wall 63 to the back wall 64 along the first direction. If formed, the effect that drainage from the ventilation chamber 60 is promoted by the gap can be obtained.

  Further, the side wall of the first wall 65 may form a curved surface instead of a flat surface. For example, the shape inside the ventilation chamber 60 may be a tube shape having a tube axis parallel to the first direction, for example. In this case, a gap is formed between the first wall 65 and the side wall forming the curved surface from the front wall 63 to the back wall 64 along the first direction, so that the drainage from the ventilation chamber 60 is performed. Can be obtained.

  Moreover, if the clearance gap 67 forms the straight path along the 1st direction as a whole, the fluid which passes the clearance gap 67 can be discharged | emitted efficiently. Therefore, for example, even if the side wall 68b has a protruding portion that hinders fluid movement, there is a portion where the protruding portion and the first wall 65 do not overlap when viewed from the first direction. For example, a straight path of fluid formed from the front wall 63 to the back wall 64 exists at least partly between the first wall 65 and the side wall 68b.

  In addition, for example, when the first wall 65 is disposed so as to face one through hole 70, if the first wall 65 is disposed at a position that blocks the center of the through hole 70, foreign substances such as water flowing from the through hole 70 can be obtained. Momentum can be reduced efficiently. In addition, when the first wall 65 is disposed in the ventilation chamber 60 in which the plurality of through holes 70 are formed as in the above embodiment, the first wall 65 is located at a position that blocks the center of the distribution region of the plurality of through holes 70. The wall 65 should just be arrange | positioned. Thereby, the momentum of foreign substances, such as water which flows in from a plurality of penetration holes 70, can be reduced efficiently.

  When viewed from the first direction, the first wall 65 is disposed so that the first wall 65 is present in a range that covers all of the one or more through holes 70 of the ventilation chamber 60. The effect of reducing the momentum of foreign matter such as water flowing in from the through hole 70 is further improved.

  Further, the second member 92 is peeled off from the peripheral edge of the second opening 82 to open the second opening 82, thereby suppressing an increase in the internal pressure of the exterior body 10. However, the second member 92 opens the second opening 82 by, for example, breaking or breaking when the internal pressure of the exterior body 10 suddenly increases, and thereby the exterior body 10 An increase in the internal pressure may be suppressed.

  In the above-described embodiment, the first member 91 is arranged in a state of covering the first opening 81 from the side opposite to the power storage element 100, and the second member 92 is the second opening 82, It arrange | positions in the state which covers from the electrical storage element 100 side. Thereby, in the situation where the external pressure of the exterior body 10 is higher than the internal pressure, the differential pressure presses the first member 91 against the peripheral edge of the first opening 81, and the second member 92 presses the peripheral edge of the second opening 82. Works in the direction of pressing. Therefore, for example, when the external pressure of the exterior body 10 is higher than the internal pressure, there is an effect that it is difficult for the occurrence of a situation in which the first member 91 and the second member 92 are detached due to the differential pressure.

  However, the arrangement positions of the first member 91 and the second member 92 are not limited to this. For example, as described above, when the second member 92 is designed to be broken or destroyed when the internal pressure of the exterior body 10 is suddenly increased, the second member 92 has the second opening 82 connected to the power storage element. You may arrange | position in the state which covers from the side by which 100 is arrange | positioned.

  Further, the present invention can be realized not only as such a power storage device but also as an exterior body included in the power storage device.

  The present invention can be applied to a power storage device and the like provided with a power storage element and an exterior body that houses the power storage element.

1, 1a, 1b, 1c, 1d, 1e Power storage device 10, 10a, 10b, 10c, 10d, 10e Outer package 11 Lid 11a Lower lid 11b Upper lid 12 Container 12a Opening 13 Positive external terminal 14 Negative external terminal 15 Vent tube 20 Power storage Unit 30 Holding member 41, 42 Busbar 60, 60a, 60b, 60c, 60d Ventilation chamber 61 First ventilation chamber 62 Second ventilation chamber 63 Front wall 64 Back wall 65 First wall 66 Second wall 67 Clearance 68a, 68b, 68c Side wall 69 Bottom 70 Through-hole 70a Third axis 75 Mesh part 81 First opening 81a First axis 82 Second opening 82a Second axis 91 First member 92 Second member 92a Opening valve part 92b Fixed part 100 Power storage element 105 Safety valve 110 Case 120 Positive electrode terminal 130 Negative electrode terminal 200 Bus bar 300 Spacer 31 0 spacer protrusion 400 clamping member 500 restraining member 600 bus bar frame 610 bus bar opening 700 heat shield plate

Claims (8)

An electrical storage device comprising an exterior body and an electrical storage element accommodated inside the exterior body,
The exterior body is provided with a ventilation chamber that communicates the interior and exterior of the exterior body,
The vent chamber is
A front wall formed with a through hole communicating with the outside;
A back wall disposed at a position facing the front wall;
A first wall disposed between the through hole and the back wall;
A side wall extending along a first direction intersecting the front wall and disposed with a gap between the first wall, and
The gap is formed from the front wall to the back wall along the first direction.
Power storage device. The power storage device according to claim 1, wherein the ventilation chamber further includes a second wall that is disposed between the first wall and the back wall and forms the gap between the side wall and the first wall. A plurality of the second walls are arranged in the first direction in the ventilation chamber,
The power storage device according to claim 2, wherein each of the first wall and the plurality of second walls is shifted in a direction intersecting the first direction. The power storage device according to any one of claims 1 to 3, wherein at least a part of a bottom surface of the ventilation chamber has a height difference so that the through hole side is lowered. The power storage device according to any one of claims 1 to 4, wherein the exterior body further includes a ventilation pipe that is disposed outside the front wall and communicates with the through hole. The power storage device according to any one of claims 1 to 5, wherein a mesh portion that forms a plurality of the through holes is provided on the front wall. The power storage device according to claim 1, wherein the ventilation chamber further includes an opening that is disposed at a position that does not overlap the gap in a plan view and communicates with the inside of the exterior body. The power storage device according to claim 7, wherein the ventilation chamber further includes a ventilation waterproof film that covers the opening.

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