JP2013110041A - Battery unit - Google Patents

Abstract

Provided is a battery unit in which an electrode terminal and a safety valve provided on the same surface of a battery can be arranged at predetermined positions in a direction orthogonal to the electrode terminal forming surface even if the dimensions of the battery vary. To do.
A holding sheet 80 urges a cell 14 from a counter electrode terminal forming surface side toward an electrode terminal forming surface side, and a packing 31 causes the cell 14 to move from the electrode terminal forming surface side to the counter electrode terminal. It is larger than the urging force that urges toward the forming surface side.
[Selection] Figure 3

Description

  The present invention relates to a battery unit including a battery having an electrode terminal and a safety valve on the same end surface of an exterior case.

  As a prior art, there is a battery pack which is a battery unit disclosed in Patent Document 1 below. In this battery pack, a rubber insulating sheet is interposed between the bottom surface of the housing and the end portions on the counter electrode side of the plurality of batteries. A rubber cap is attached to an end of each battery on the electrode side so that only a pair of electrodes protrudes, and the battery is held in the casing by pressing the cap with a holding plate.

JP 2010-49808 A

  However, in the above-described conventional battery pack, each battery is positioned with respect to the housing via the insulating sheet on the opposite electrode side and the cap on the electrode side. For this reason, there is a problem that the electrode position in the protruding direction of the electrode (direction orthogonal to the electrode formation surface) is likely to vary due to the dimensional variation of the battery, the dimensional variation of the insulating sheet and the cap, and the like. If the positions of the electrodes vary, there may be a problem that excessive stress is applied to the connection portion such as a bus bar to the electrodes.

  Further, although not disclosed in the battery pack of Patent Document 1, when a safety valve for discharging abnormal gas is provided on the electrode forming surface of the battery, the dimensional variation of the battery, the dimensions of the insulating sheet and the cap There is a problem that the position of the safety valve tends to vary due to variations and the like. If the position of the safety valve varies, it may be difficult to seal between the components constituting the exhaust system, and there may be a problem that gas, electrolyte, etc. leak from the exhaust system when the safety valve is opened.

  The present invention has been made in view of the above points, and even if the dimensions of the battery vary, the electrode terminal and the safety valve provided on the same surface of the battery are in a predetermined position in the direction orthogonal to the electrode terminal forming surface. It aims at providing the battery unit which can be arrange | positioned.

In order to achieve the above object, in the invention described in claim 1,
A battery (10-14) having an electrode terminal composed of a positive electrode terminal (10b-14b) and a negative electrode terminal (10a-14a) provided on one end surface of the outer case;
A safety valve (10c to 14c) that is provided on one end surface of the outer case on which the electrode terminal is formed and that breaks and opens when the internal pressure of the battery becomes abnormal;
A case body (7, 8) having a battery positioning reference wall (8d) with which an end face of the outer case excluding the electrode terminal and the position where the safety valve is disposed comes into contact;
A duct portion having a fluid introduction port (61a) corresponding to the safety valve and an inner wall surface facing the safety valve with the fluid introduction port interposed therebetween so that the safety valve is exposed to the internal fluid passage through the fluid introduction port (6) and
An elastic member (80) provided between the other end surface of the exterior case and the case body and biasing the battery from the other end surface side toward the one end surface side;
A sealing member (30, which is made of an elastic body, is provided so as to surround the safety valve and the fluid introduction port, and is compressed between one end face of the outer case and the duct portion, and hermetically seals between the outer case and the duct portion. 31), and
The biasing force that the elastic member biases the battery from the other end surface side toward the one end surface side is larger than the biasing force that the seal member biases the battery from the one end surface side toward the other end surface side. .

  According to this, the biasing force that the elastic member biases the battery from the other end surface side toward the one end surface side is larger than the biasing force that the seal member biases the battery from the one end surface side toward the other end surface side. For this reason, the end surface of the battery outer case excluding the positions where the electrode terminals and the safety valve are disposed is surely brought into contact with the battery positioning reference wall of the case body. Therefore, even if the battery dimensions and the like vary, the electrode terminal and the safety valve provided on the same surface of the battery can be disposed at predetermined positions in the direction orthogonal to the electrode terminal forming surface.

  In the invention according to claim 2, a plurality of batteries are arranged side by side, and a plurality of fluid inlets are formed in the duct portion corresponding to safety valves of the plurality of batteries. It is characterized by comprising bus bars (21 to 24) for connecting the electrode terminals.

  According to this, in a battery unit including an assembled battery in which a plurality of batteries are combined, the electrode terminals and safety valves of the plurality of batteries can be respectively disposed at predetermined positions in a direction orthogonal to the electrode terminal forming surface. . Therefore, it is possible to suppress an excessive stress from being applied to the connection portion of the bus bar to the electrode terminal, and it is possible to reliably seal between the plurality of batteries and the duct portion with the seal member.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a front view which shows schematic structure of the assembled battery and control board in 1st Embodiment to which this invention is applied. It is a front view which shows schematic structure of the assembled battery, control board, and smoke exhaust duct which comprise the principal part of the battery pack which is the battery unit of 1st Embodiment. It is the III-III sectional view taken on the line of FIG. It is a perspective view for demonstrating arrangement | positioning of the assembled battery and smoke exhaust duct of 1st Embodiment. It is a top view for demonstrating arrangement | positioning of the assembled battery and smoke exhaust duct of 1st Embodiment. It is a disassembled perspective view for demonstrating the structure of the assembled battery and smoke exhaust duct of 1st Embodiment. It is a disassembled perspective view for demonstrating the structure of the assembled battery of 1st Embodiment. It is a top view in the state where a cover was removed about a battery pack provided with an assembled battery, a control board, and a flue gas duct of a 1st embodiment. It is a perspective view of the battery pack equipped with the cover of the first embodiment.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where only a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those described previously. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination is not particularly troublesome.

(First embodiment)
FIG. 1 is a front view showing a schematic configuration of an assembled battery and a control board in a first embodiment to which the present invention is applied, and FIG. 2 is an assembled battery and a control that constitute a main part of a battery pack that is a battery unit. It is a front view which shows schematic structure of a board | substrate and the duct for flue gas. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a perspective view for explaining the arrangement of the assembled battery and the exhaust duct, and FIG. 5 is a plan view for explaining the arrangement of the assembled battery and the exhaust duct.

  FIG. 6 is an exploded perspective view for explaining the configuration of the assembled battery and the smoke exhaust duct, and FIG. 7 is an exploded perspective view for explaining the configuration of the assembled battery. FIG. 8 is a plan view of the battery pack including the assembled battery, the control board, and the smoke exhaust duct with the cover removed, and FIG. 9 is a perspective view of the battery pack with the cover attached.

  The battery pack shown in FIG. 9 is mounted on an idle stop vehicle having an idle stop function that stops the engine when the vehicle stops from the running state even when the ignition switch is on, for example. The assembled battery in the battery pack is configured by connecting a plurality of unit cells made of secondary batteries such as lithium ion batteries in series with a bus bar or the like, and is used as an auxiliary battery for a lead storage battery. The battery pack is disposed, for example, under the front seat in the vehicle interior.

  The battery pack may be used for, for example, a hybrid vehicle using a traveling drive source by combining an internal combustion engine and a motor driven by electric power charged in the battery, an electric vehicle using a motor as a traveling drive source, and the like. The secondary battery that constitutes the battery pack assembly is, for example, a nickel hydride secondary battery, a lithium ion battery, or an organic radical battery. The secondary battery is housed in a case and is placed under a car seat, between a rear seat and a trunk room. Can be arranged in a space between the driver seat and the passenger seat.

  The plurality of single cells constituting the assembled battery 1 of the present embodiment has an outer case that constitutes an outer shell such as an aluminum can, for example, and includes a positive electrode terminal and a negative electrode terminal that protrude from one end surface of the rectangular parallelepiped outer case. Each has an electrode terminal. The assembled battery 1 includes a plurality of bus bars that connect the electrode terminals so that the plurality of unit cells are connected in series.

  As shown in FIG. 1, in the present embodiment, the assembled battery 1 includes five unit cells 10, 11, 12, 13, and 14 as an example.

  Each of the five single cells 10 to 14 is housed in a predetermined position in the battery case 7, thereby constituting the assembled battery 1 together. The five single cells 10 to 14 constituting the assembled battery 1 include a plurality of first stacked battery groups 2 and second stacked battery groups 3 formed by stacking single cells in the thickness direction X of a rectangular parallelepiped outer case. Form. The first stacked battery group 2 is configured by stacking the cell 10, the cell 13, and the cell 14 in the thickness direction X with a predetermined interval. The second stacked battery group 3 is configured by stacking the unit cells 11 and the unit cells 12 in the thickness direction X with a predetermined interval.

  The negative electrode terminal 10a of the unit cell 10 is electrically connected to the bus bar 20, and further connected to the vehicle ground by connecting the bus bar 20 to the vehicle side by screwing or the like. The end portion of the bus bar 20 extends laterally from the lower part of the first stacked battery group 2, that is, has a shape extending laterally from the lower side surface of the assembled battery 1 </ b> C. The positive terminal 10 b of the unit cell 10 is connected to the negative terminal 11 a of the unit cell 11 by a bus bar 21. The positive terminal 11 b of the unit cell 11 is connected to the negative terminal 12 a of the unit cell 12 by the bus bar 22. The positive terminal 12 b of the unit cell 12 is connected to the negative terminal 13 a of the unit cell 13 by the bus bar 23.

  The positive terminal 13 b of the unit cell 13 is connected to the negative terminal 14 a of the unit cell 14 by the bus bar 24. The positive terminal 14 b of the unit cell 14 is electrically connected to the bus bar 25, and is further electrically connected to the power board 50 when the bus bar 25 is connected to the power board 50 by screwing or soldering. Thereby, all the single cells 10-14 of the assembled battery 1 are electrically connected in series via each bus bar so that an electric current may flow like a meander in front view, as shown with the broken line of FIG. As described above, the bus bars 20 to 25 are configured not to connect adjacent battery terminals in an oblique direction but to connect only in the vertical direction and the horizontal direction.

  A safety valve is provided in the outer case of each unit cell. Each safety valve is positioned between the positive electrode terminal and the negative electrode terminal, and is set so as to be broken and opened when the internal pressure of the unit cell becomes an abnormal pressure. In each unit cell, the electrode terminal and the safety valve are provided on the same surface of the outer case. An end surface (electrode terminal forming surface) of the outer case provided with the electrode terminal and the safety valve corresponds to one end surface of the outer case in the present embodiment. Further, the end surface (the counter electrode terminal forming surface) opposite to the end surface of the outer case provided with the electrode terminal and the safety valve corresponds to the other end surface of the outer case in the present embodiment.

  The safety valve is configured, for example, by sticking and closing a thin metal film in a hole opened in the end face of the outer case of the unit cell. In this case, when the internal pressure of the unit cell becomes abnormal, the metal film is broken and the hole of the outer case is opened, and the gas inside the unit cell is released to the outside of the outer case. As a result, the internal pressure of the cell decreases, and the cell itself can be prevented from bursting. As shown in FIG. 1, the safety valve 10c, the safety valve 13c, and the safety valve 14c are arranged so as to be aligned in the thickness direction X, and the safety valve 11c and the safety valve 12c are arranged so as to be aligned in the thickness direction X, as viewed from the front.

  As shown in FIGS. 6 and 7, the insulating cover 8 insulates the bus bars 20 to 25 and the outer case of the cells 10 to 14 and covers at least the end surface portion of the outer case excluding the safety valves 10 c to 14 c and the electrode terminals. It is provided as follows. That is, when the insulating cover 8 is mounted so as to cover the end face of the outer case, the insulating cover 8 is formed with an opening larger than the safety valve at a corresponding position of each safety valve and corresponding to each electrode terminal. An opening larger than the electrode terminal is formed at the position. Therefore, each safety valve and each electrode terminal are inside the respective openings and are not covered with the insulating cover 8 in a state where the insulating cover 8 is attached to the assembled battery 1 housed in the battery case 7 and integrated. Will be exposed.

  Furthermore, the insulating cover 8 is provided with recesses for positioning the bus bars as many as the number of bus bars required by the assembled battery 1. Each bus bar has an opening through which the electrode terminal of the unit cell is inserted. When each bus bar corresponding to each concave portion of the insulating cover 8 is fitted, the electrode terminal to be connected is fitted into the opening of each bus bar, and the positional relationship between each cell and the bus bar is appropriately determined. The position of each bus bar 20 is regulated by a positioning process in which each predetermined bus bar is fitted in each concave portion of the insulating cover 8, so that the joining process such as welding or bonding between the bus bar and the electrode terminal to be connected can be performed quickly and accurately. In addition, it is possible to prevent the bus bar from touching the parts that should not be touched, thereby preventing improper connection such as a short circuit or damage to the parts.

  In the present embodiment, the configuration including the battery case 7 and the insulating cover 8 corresponds to a case body that accommodates the cells 10 to 14 that are batteries. As shown in FIGS. 3 and 7, a holding sheet 80 that is an elastic member is interposed between the counter electrode terminal forming surface of each of the cells 10 to 14 and the battery case 7 by being compressed. . The holding sheet 80 is a flat plate member made of, for example, a rubber material that is relatively excellent in heat resistance.

  When the step of connecting a plurality of electrode terminals to be connected by a plurality of bus bars is performed, first, a holding sheet 80 is interposed between the counter electrode terminal forming surface of each unit cell and the battery case 7. However, each unit cell is installed and accommodated in a predetermined position of the battery case 7. Next, the insulating cover 8 is attached to the battery case 7 in which the cells 10 to 14 are accommodated. At this time, the upper and lower portions of the battery case 7 and the insulating cover 8 are fastened by using two clips 33, and the left and right side parts are fastened by using two clips 32.

  In this state, for example, as shown in FIG. 3, each unit cell is pushed in the direction from the counter electrode terminal forming surface toward the electrode terminal forming surface by the urging force of the compressed holding sheet 80. Thereby, the surface part except the arrangement position of the electrode terminal and the safety valve in the electrode terminal forming surface of the outer case of each unit cell is pressed against the wall part of the insulating cover 8 facing the electrode terminal forming surface of the unit cell outer case. It is done. The wall portion facing the electrode terminal forming surface is a reference wall portion 8d for positioning each cell. In FIG. 3, the control board 5 is not shown, and the smoke exhaust duct 6 to be described later shows a cross section in the direction in which a part of the smoke exhaust passage 6 a extends.

  Next, predetermined corresponding bus bars are fitted into the six recesses of the insulating cover 8 assembled integrally with the battery case 7 and the cells 10 to 14. In this state, a corresponding predetermined electrode terminal is inserted through the opening of each bus bar. Furthermore, each bus bar and each electrode terminal are joined, for example, by welding such as laser welding or arc welding, or by adhesion.

  Among the plurality of stacked battery groups 2 and 3, the second stacked battery group 3 is configured so that the number of stacked layers is smaller than that of the adjacent first stacked battery group 2. The second stacked battery group 3 has a stacking height corresponding to two cells 11 and 12, and the first stacked battery group 2 includes three cells 10, 13, and 14. The stacking height of the minute. In this way, the second stacked battery group 3 and the first stacked battery group 2 form a step space 4 due to the difference in the number of stacked layers. In this case, the step space 4 forms a step corresponding to the thickness dimension of about one unit cell. A control board 5 for detecting the state of the plurality of single cells 10 to 14 is arranged in the step space 4. For this reason, the height of the assembled battery 1 including the control board 5 in the thickness direction X can be kept low. Moreover, it is preferable that the upper end part of the control board 5 is installed so as to be within the upper end part in the thickness direction X of the adjacent first stacked battery group 2. In addition, the control board 5 is mounted on a boss standing on a battery case 7 that accommodates a single cell and is fixed with screws.

  The electrode terminal forming one end of the series connection, that is, in the case of this embodiment, the positive electrode terminal 14 b of the unit cell 14 having the highest potential is set at a position adjacent to the step space 4. The power board 50 is connected to the terminal block 51 and connected to the control board 5 and the vehicle via the wire harness 52. In this way, all the unit cells 10 to 14 constituting the plurality of stacked battery groups 2 and 3 are connected in series.

  The assembled battery 1 includes a smoke exhaust duct 6 provided so as to expose all the safety valves 10c to 14c in a smoke exhaust passage 6a that is an internal fluid passage. The smoke exhaust duct 6 corresponds to a duct portion in the present embodiment. The exhaust duct 6 is made of a heat-resistant material, and is made of, for example, polyphenylene sulfide resin (PPS), polybutylene terephthalate resin (PBT), various resins to which a flame retardant is added, or the like.

  The heat resistance of the smoke exhaust duct 6 is such that even if the inside of the unit cell is in an abnormally high pressure state and the internal gas or electrolyte is blown out due to the break of the safety valve, the duct part does not melt and is not damaged It is to have. The resin constituting the smoke exhaust duct 6 preferably has heat resistance that can withstand 200 ° C. for 1 minute or longer (maintaining the function of the fluid passage). Thereby, it is possible to prevent the control board 5, the power board 50, and the like from being damaged by the gas, the electrolytic solution, and the like.

  The insulating cover 8 has insulating properties, and is formed of a synthetic resin such as polypropylene (PP resin), PP resin containing filler and talc, for example. Furthermore, it is preferable that the insulating cover 8 is formed of a heat-resistant resin as with the smoke exhaust duct 6.

  The smoke exhaust duct 6 is a cylindrical body extending in the horizontal direction, and includes openings larger than the safety valves at positions corresponding to all the safety valves 10 c to 14 c when assembled to the insulating cover 8. When assembled to the insulating cover 8, the peripheral edge of the opening is in close contact with the outer case surface around the safety valves 10 c to 14 c with the packings 30 and 31 sandwiched therebetween.

  The peripheral surface portion of the opening, the packing 30 and the packing 31 contribute to securing air density between the smoke exhausting duct 6 and the outer case. The packings 30 and 31 are made of, for example, a rubber material having relatively excellent heat resistance. The opening described above is an introduction port 61a (see FIG. 3) corresponding to a fluid introduction port for introducing gas or the like into the smoke passage 6a when the safety valve is opened.

  Accordingly, the packings 30 and 31 are made of an elastic body and are provided so as to surround the safety valve and the fluid introduction port, and are compressed between the electrode terminal forming surface of the unit cell outer case and the smoke exhaust duct, This corresponds to a seal member that hermetically seals between the smoke exhaust duct.

  Further, the smoke exhaust duct 6 includes a lead-out duct portion 6b that communicates with the smoke exhaust passage 6a and forms an internal passage extending outward from the side portion. The lead-out duct portion 6b functions to discharge the gas ejected to the smoke exhaust passage 6a to the outside away from the assembled battery 1.

  Instead of providing the packings 30 and 31, a highly flexible resin such as an elastomer may be provided by a two-color molding or the like at a portion of the smoke exhaust duct 6 that presses the periphery of the safety valves 10c to 14c.

  A plurality of metal conductors which are conductive members are insert-molded in the smoke exhaust duct 6. One end of the metal terminal on the left side of the figure is a voltage detection terminal 40. The voltage detection terminal 40 extends so as to protrude upward into the step space 4, and is connected to a control board 5 (specifically, a voltage detection circuit) disposed in the step space 4, as shown in FIG. The The other end of the metal conductor is connected to the bus bar, and a predetermined potential of the assembled battery 1 is transmitted to the voltage detection terminal 40.

  The smoke exhausting duct 6 includes claw portions 6c in which convex portions projecting outward are formed on each of an upper end portion and a lower end portion located near the center in the longitudinal direction (lateral direction). Further, the smoke exhaust duct 6 includes a claw portion 6d in which convex portions projecting outward are formed on each of an upper end portion and a lower end portion located on one side in the longitudinal direction (lateral direction). . On the other hand, the insulating cover 8 is provided with a U-shaped engagement piece 8a that forms a fitting hole at a position corresponding to each of the two claw portions 6c, and each of the two claw portions 6d A U-shaped engagement piece 8b for forming a fitting hole at a corresponding position is provided.

  When the smoke exhaust duct 6 is assembled to the insulating cover 8, the upper and lower two claw portions 6c engage with the inner wall surface of the corresponding engagement piece 8a, and the upper and lower two claw portions 6d correspond. Engages with the inner wall surface of the piece 8b. Thereby, the moving direction of the smoke exhaust duct 6 is regulated, and the packings 30 and 31 are compressed so that the smoke exhaust duct 6 is pressed against the electrode terminal forming surface of the unit cell outer case, and the surfaces of the safety valves 10c to 14c And airtightness between the smoke exhaust passage 6a can be realized.

  The compressed packings 30 and 31 press each unit cell in the direction from the electrode terminal forming surface to the counter electrode terminal forming surface by using the restoring force as an urging force. Here, the force by which the packings 30 and 31 urge each unit cell in the direction from the electrode terminal forming surface to the counter electrode terminal forming surface is such that the holding sheet 80 causes each unit cell to move from the counter electrode terminal forming surface to the electrode terminal forming surface. It is smaller than the force energizing in the direction toward. Therefore, the urging force of the packings 30 and 31 does not separate the electrode terminal forming surface of the outer case of each unit cell from the reference wall portion 8 d of the insulating cover 8.

  As shown in FIGS. 8 and 9, the base 9 is fixed with main components constituting the battery pack such as the assembled battery 1 on which the control board 5 is mounted and fixed, the power board 50, and the terminal block 51. Is supported from below. The base 9 has, for example, insulating properties, and is made of, for example, a synthetic resin such as polypropylene (PP), a filler for improving strength, or PP containing talc. The base 9 includes a fixing portion for fixing to the vehicle side by bolting or the like, and an attachment portion for attaching a cover 60 that covers the assembled battery 1 and the like from above. In this way, the base 9 to which the main components are fixed is covered with the cover 60 and packed, so that the battery pack is mounted on the vehicle.

  The battery monitoring device is a battery ECU that monitors the state of the assembled battery 1 and is mounted on the control board 5. In order to detect information related to the state of the assembled battery 1, the battery monitoring device is connected to the assembled battery 1 through a plurality of detection lines including metal conductors that extend from detection terminals installed at predetermined positions of the assembled battery 1. It is connected. The detection line is, for example, a communication line for transmitting information such as the voltage and temperature of the assembled battery 1 to the battery monitoring device. The detection terminal includes a temperature sensor that detects information related to the state of the assembled battery 1, other various sensors, and the like.

  The battery pack includes electronic components that perform charging, discharging, battery temperature monitoring, and the like of the plurality of single cells 10 to 14. For example, the electronic components include a DC / DC converter, an inverter, a power element mounted on the power board 50, various electronic components mounted on the control board 5, various electronic control devices, and the like. The battery pack is configured to be communicable with a battery monitoring device to which detection results from various sensors that monitor the state of the battery such as voltage and temperature are input, and to control power transmission / reception of the DC / DC converter. A control device that performs the above operation, and a wire harness that connects each device. Moreover, you may make it a battery pack include the air blower which provides ventilation and cools each cell.

  According to the battery pack having the above-described configuration, the holding sheet 80 urges each of the single cells 10 to 14 from the counter electrode terminal forming surface side toward the electrode terminal forming surface side, and the packings 30 and 31 have each single unit. It is larger than the urging force that urges the batteries 10 to 14 from the electrode terminal forming surface side toward the counter electrode terminal forming surface side. Therefore, of the electrode terminal forming surfaces of the outer cases of the single cells 10 to 14, the end surfaces excluding the positions where the electrode terminals and the safety valve are disposed are in contact with the reference wall portion 8 d of the insulating cover 8. Thereby, even if the size of each unit cell 10-14 varies, the electrode terminal and the safety valve provided on the same surface of each unit cell are arranged at predetermined positions in the direction orthogonal to the electrode terminal formation surface. be able to.

  In other words, even if the outer case of the unit cell has a slightly poor dimensional accuracy, or there are convex scratches or the like on the outer case, the battery pack can be configured using this.

  Excessive stress is applied to the connection between the electrode terminals and the bus bars 20 to 26 by disposing the electrode terminals and safety valves of the individual cells 10 to 14 at predetermined positions in a direction orthogonal to the electrode terminal formation surface. In addition, the gap between the plurality of single cells 10 to 14 and the exhaust duct 6 is securely sealed with the packings 30 and 31, and when the safety valve is opened, gas, electrolyte or the like leaks and the control board 5 or the like It can prevent adhering to other parts.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the embodiment described above, the holding sheet 80 that is an elastic member is made of rubber, but is not limited thereto. For example, the elastic member may be a spring or the like.

  Moreover, in the said embodiment, although the packings 30 and 31 which are sealing members were rubber | gum, it is not limited to this. For example, the sealing member may be a material obtained by curing a liquid gasket material or an adhesive.

  Moreover, in the said embodiment, although the battery pack using the assembled battery 1 which combined five unit cells was demonstrated, it is not limited to this. The number of batteries may be other than five, and the number of batteries may be one.

  Moreover, in the said embodiment, the case body was comprised with two members, the battery case 7 and the insulation cover 8. FIG. That is, although the case body is formed by combining two members formed separately on the electrode terminal forming surface side and the counter electrode terminal forming surface side, the case body is not limited thereto. The case body may be configured by combining three or more members, or the case body may be configured by one member.

  Moreover, in the said embodiment, although each single cell 10-14 provided the safety valve between a pair of electrode terminals, it is not limited to this. If the safety valve is formed on the electrode terminal forming surface of the battery outer case, the safety valve may not be between the positive terminal and the negative terminal.

  Moreover, in the said embodiment, although the cell 10-14 was a storage battery (secondary battery), it is not limited to this, A primary battery may be sufficient.

1 battery pack 6 smoke exhaust duct (duct)
6a Smoke exhaust passage (fluid passage)
7 Battery case (part of case body)
8 Insulation cover (part of the case body)
8d Reference wall 10-14 Single battery (battery)
10a-14a Negative terminal (electrode terminal)
10b-14b Positive terminal (electrode terminal)
10c-14c Safety valve 20-25 Bus bar 30, 31 Packing (seal member)
61a Inlet (fluid inlet)
80 Holding sheet (elastic member)

Claims (2)

A battery (10-14) having an electrode terminal composed of a positive electrode terminal (10b-14b) and a negative electrode terminal (10a-14a) provided on one end surface of the outer case;
A safety valve (10c-14c) that is provided on the one end surface and that breaks and opens when the internal pressure of the battery becomes an abnormal pressure;
A case body (7, 8) having a reference wall portion (8d) for battery positioning with which the end surface of the one end surface excluding the electrode terminal and the position where the safety valve is disposed contacts; ,
A fluid introduction port (61a) corresponding to the safety valve; and an inner wall surface facing the safety valve across the fluid introduction port. The safety valve is provided in an internal fluid passage (6a) via the fluid introduction port. A duct portion (6) provided to be exposed;
An elastic member (80) provided between the other end surface of the exterior case and the case body and biasing the battery from the other end surface side toward the one end surface side;
A sealing member that is made of an elastic body, is provided so as to surround the safety valve and the fluid inlet, and is compressed between the one end surface and the duct portion to hermetically seal between the exterior case and the duct portion (30, 31)
The urging force by which the elastic member urges the battery from the other end surface side toward the one end surface side, and the urging force by which the seal member urges the battery from the one end surface side toward the other end surface side. A battery unit characterized by being larger than. A plurality of the batteries are juxtaposed,
The duct portion is formed with a plurality of fluid inlets corresponding to the safety valves of the plurality of batteries,
The battery unit according to claim 1, further comprising a bus bar (21 to 24) for connecting the electrode terminals of the plurality of batteries arranged in parallel.

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