JP2018133152A - Battery module and battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a battery pack with a simple configuration.SOLUTION: A battery module includes: a battery laminate comprising battery cells and partition members alternately laminated therein; a holding member to hold a plurality of connection conductors electrically connecting a plurality of terminals; a tightly binding member which tightly binds the battery laminate; and a fixing member which fixes the holding member to the tightly binding member. Each partition member is a sheet-like electrically insulating member which electrically isolates between battery cells adjacent to each other in a lamination direction of the battery laminate and which is molded such that an outer shape conforms to the size and the shape of the outer shape of the lamination plane of each battery cell. The fixing member is provided to a corner at which a first lamination plane and a second lamination plane of the battery laminate intersect with each other and which is continuous in the lamination direction of the battery laminate, and is engaged to the holding member and the tightly binding member to fix the holding member to the tightly binding member.SELECTED DRAWING: Figure 2

Description

The present invention relates to a battery module and a battery pack including the battery module.

A battery pack used as a driving power source or an auxiliary power source for an electric vehicle or a hybrid electric vehicle is mounted on a floor of a loading platform of a vehicle or a floor under a seat in a state where the battery is housed in a case. The battery pack mounting space is so small that it becomes a small car. For this reason, the battery pack is required to be downsized corresponding to the mounting space.
As a means for achieving the downsizing of the battery pack, simplification of the components of the battery module constituting the battery pack can be considered. For example, in the power supply device described in Patent Document 1, the spacer disposed between the stacked battery cells is used as an insulating sheet to reduce the size.

Japanese Patent Laying-Open No. 2015-187912 (see paragraph 0038 and FIG. 15)

Accompanying the simplification of the component parts, the attached functions that the component parts have may be impaired. For example, if the spacer disposed between the battery cells has an attached function for fixing the bus bar holder that holds the bus bar that electrically connects the battery cells, the bus bar holder can be used along with the spacer sheeting. It will not be possible to have the attached function to fix the. As a structure for fixing the bus bar holder to the spacer, for example, there is an engagement structure by snap fit. In this case, with the formation of the spacer sheet, it becomes difficult to form elastic protrusions on the spacer side.

In addition, it is possible to replace the attached function provided to the component with another component. However, in order to offset the simplification of the component parts, another problem may occur such as an increase in the number of parts or a complicated structure, resulting in an increase in part costs.
An object of the present invention is to reduce the size of a battery pack with a simple configuration.

One of the representative inventions of the present application that solves the above problems is characterized by a battery module that constitutes a battery pack. Specifically, in the battery module, a plurality of battery cells and partition members are alternately stacked, and a terminal provided on the outer surface of the rectangular container of the plurality of battery cells is a stack of the battery cells and the partition member. A battery stack disposed on a first stack surface that is one of the stack surfaces formed by the plurality of contacts, and a plurality of terminals that are provided on the first stack surface of the battery stack and electrically connect the plurality of terminals. A holding member that holds the connection conductor, a lashing member that lashes the battery stack, and a fixing member that fixes the holding member to the lashing member, the partition member of the battery stack A sheet-like electrical insulating member that is electrically isolated between battery cells adjacent in the stacking direction and is shaped so that the outer shape conforms to the size and shape of the outer shape of the stacked surface of the battery cells. The members are both ends in the stacking direction of the battery stack A pair of first lashing members that are arranged corresponding to the end faces and press the end faces from both sides in the stacking direction of the battery laminate, and arranged corresponding to a pair of second laminated faces that intersect the first laminated face. And a second lashing member extending in the stacking direction of the battery stack and fixed to the pair of first lashing members, wherein the fixing member includes the first lamination surface and the first lashing member. Two crossing surfaces are provided, and are provided at corners that are continuous in the stacking direction of the battery stack, and engage with each of the holding member and the second securing member to attach the holding member to the second fixing member. It is fixed to the binding member.

  According to one of the representative inventions of the present application, it is possible to reduce the size of the battery pack with a simple configuration.

The perspective view which shows the external appearance of a battery pack. The top view which shows the internal structure of a battery pack when an upper cover is removed. The perspective view which shows the whole structure of the battery module accommodated in the inside of a battery pack. The disassembled perspective view which shows the structure of the battery module accommodated in the inside of a battery pack. The perspective view which shows the structure of a terminal block. The perspective view seen from the opposite direction of FIG. The perspective view seen from the back side of FIG. The perspective view which shows the structure of a relay unit. The perspective view seen from the back side of FIG.

Embodiments of a battery pack according to the present invention will be described below with reference to the drawings.
FIG. 1 is an external perspective view as an embodiment of a battery pack. The battery pack 1 includes a case composed of a case body 2 and an upper cover 3. HV terminals 21 and 81 are provided at both longitudinal ends of the upper surface of the battery pack 1. The HV terminals 21 and 81 are external terminals, and the battery pack 1 connects the HV cables to the HV terminals 21 and 81 to supply (discharge) electric power to an electric vehicle, a hybrid electric vehicle, or an electric device, or In addition, power can be received (charged) from the drive source of the hybrid electric vehicle. In the present embodiment, the HV terminal 21 is on the negative electrode side, and the HV terminal 81 is on the positive electrode side.

  A signal connector 4 is disposed on the side surface of the battery pack 1. The signal connector 4 is a signal connector for the controller (circuit unit) of the battery pack 1 and is connected to the controller on the vehicle side to receive information exchange and power supply.

FIG. 2 is an exploded perspective view of the battery pack 1 shown in FIG. The case body 2 is a metal container having a bottom portion 2a and opened upward. The upper cover 3 is a lid member that covers the opening of the case body 2 and is formed of a resin such as PP (polypropylene). A plurality of engaging recesses are provided on the outer peripheral surface of the case body 2 on the opening side. A plurality of engagement elastic projections are provided on the edge of the upper cover 3 at positions corresponding to the plurality of engagement recesses of the case body 2. By engaging the plurality of engaging recesses of the case body 2 and the plurality of engaging protrusions 3 a of the upper cover 3, the upper cover 3 is attached and fixed to the case body 2.
Inside the case main body 2, a battery module having a configuration in which a plurality of battery cells 5 and partition members 6 are alternately stacked and pressed by a pair of end plates 7 from both ends in the stacking direction is disposed in the center. Yes. In a region facing one end of the battery module in the stacking direction of the battery stack, a relay unit 8 that controls electrical connection between the battery module and the positive terminal 81 is disposed. In addition, in a region facing the other end of the battery module in the stacking direction of the battery stack, a terminal in which a circuit unit, a cooling fan, or the like that detects the voltage of the plurality of battery cells and monitors the state of the battery cells is integrated A table 9 is arranged. In addition, the battery module includes a side plate 10 disposed on both sides of the short side surface of the battery stack, and a bus bar holder (holding member) 11 disposed on the upper portion (upper cover 3 side) of the battery stack.

<Battery module>
FIG. 3 is an external perspective view of the battery module 100, and FIG. 4 is an exploded perspective view of the battery module 100. The battery module 100 includes a battery stack in which a plurality of battery cells 5 and partition members 6 are alternately stacked. Here, the partition member 6 is arrange | positioned at the both ends of the battery laminated body. The battery stack is secured by a securing member. The securing member includes a pair of end plates 7 and a pair of side plates 10. The plurality of battery cells 5 are electrically connected by a plurality of bus bars. The bus bar is a plate-like connection conductor. In the present embodiment, the plurality of battery cells 5 are electrically connected in series by a plurality of bus bars. In addition, as an electrical connection of the plurality of battery cells 5, parallel connection or series-parallel connection is also possible. The plurality of bus bars are held by a bus bar holder 11. The bus bar holder 11 is placed on one surface of the battery stack, and is fixed to the pair of side plates 10 by a joint member (fixing member) 19.
The battery module 100 thus configured is housed and fixed inside the case body 2 such that the stacking direction of the battery stack is oriented in the same direction as the longitudinal direction of the housing case. An electrically insulating elastic sheet (not shown) having thermal conductivity is interposed between the battery module 100 and the bottom surface of the case body 2. Thereby, the plurality of battery cells 5 are thermally connected to the case body 2 in a state of being electrically isolated from the case body 2.

<Battery cell>
The battery cell 5 is a flat rectangular lithium ion secondary battery. The battery cell 5 may be another secondary battery such as a nickel metal hydride battery. In the battery cell 5, a power generation element (not shown) is accommodated in a battery container formed by joining a battery can 52 and a battery lid 51, and a non-aqueous electrolyte is injected. The power generation element is formed by flattening a metal foil (made of aluminum or aluminum alloy) coated with a positive electrode mixture and a metal foil (made of copper or copper alloy) coated with a negative electrode mixture through a separator which is an insulating member. A plurality of wound bodies or a plurality of laminated bodies are used.

  The battery can 52 is a metal container formed by deep drawing from a metal plate made of aluminum or an aluminum alloy, has an opening, and is formed so that the depth dimension is larger than the dimension of the short side of the opening. It is a flat rectangular container with a bottom. The battery lid 51 is a flat plate member formed by stamping from a member of the same material as the battery can 52 so that the outer shape conforms to the size and shape of the opening of the battery can 52. And is fixedly welded to the edge of the opening of the battery can 52 by a joining method such as laser beam welding. According to the outer container formed in this way, the pair of wide side surfaces having the largest area and facing each other, and the smallest area, arranged at both ends in the wide direction (longitudinal direction) of the wide side surface, facing each other, Appearance of a flat rectangular parallelepiped (hexahedron) having a pair of narrow side surfaces that intersect the wide side surfaces at right angles, a bottom surface that intersects the wide side surfaces 111W at right angles, and a top surface that faces the bottom surface and intersects the wide side surfaces at right angles Presents.

  A positive electrode terminal 53 and a negative electrode terminal 54 protrude from both ends of the battery lid 51 in the longitudinal direction so as to protrude outward (upward) from the outer surface. The positive electrode terminal 53 and the negative electrode terminal 54 are input / output terminals for outputting (discharging) the electric power stored in the electric storage element to the outside or inputting (charging) electric power generated outside to the electric storage element, Each is electrically connected to the metal foil of the corresponding electrode of the electricity storage element.

  A liquid injection port and a safety valve are formed between the positive terminal 53 and the negative terminal 54 of the battery lid 51. The liquid injection port is an injection port for injecting the electrolytic solution into the exterior container, and is sealed by welding with a laser beam or the like after injecting the electrolytic solution. The safety valve is configured to be cleaved when the internal pressure of the outer container rises to a predetermined value or more to release the internal pressure of the outer container.

<Battery laminate>
The plurality of battery cells 5 are stacked in one direction so that the wide side surface is a stacked surface. At this time, the plurality of battery cells 5 are stacked such that the positive electrode terminal 53 and the negative electrode terminal 54 are disposed on the first stacked surface 140 </ b> R formed by the upper surface of the battery cell 5 and the end surface of the edge of the partition member 6. . The plurality of battery cells 5 are stacked such that the directions of the stacked surfaces of adjacent battery cells 5 are opposite to each other via the partition member 6 in the stacking direction of the battery stack. In other words, the plurality of battery cells 5 are reversed 180 degrees around the center of the battery lid 51 with respect to one of the battery cells 5 adjacent in the stacking direction of the battery stack via the partition member 6. Is laminated. By being laminated in this manner, terminals in which positive electrode terminals 53 and negative electrode terminals 54 are alternately arranged in a row in the lamination direction at both ends in the direction orthogonal to the lamination direction of the first lamination surface 140R of the battery laminate. An array is formed. In the present embodiment, a case where twelve battery cells 5 are stacked is shown.

  The battery stack is formed by the narrow side surface of the battery cell 5 and the end surface of the edge of the partition member 6 in addition to the first stack surface 140R, and is opposed to each other and intersects the first stack surface 140R at a right angle. The second stacked surface 140S is formed by the bottom surface of the battery cell 5 and the end surface of the edge of the partition member 6, and is opposed to the first stacked surface 140R and intersects the second stacked surface 140S at a right angle. It has. Further, both ends in the stacking direction of the battery stack are formed by a surface opposite to the surface facing the battery cell 5 of the partition member 6, and a pair of intersecting at right angles to each of the first to third stacking surfaces. It becomes the end face.

  The battery stack thus formed has a rectangular parallelepiped (hexahedron) appearance, the stacking direction is the longitudinal direction (X direction indicating the lateral direction of the rectangular plane), and the opposing direction of the second stacking surface 140S (perpendicular to the stacking direction). Is the short direction (Y direction indicating the longitudinal direction of the rectangular plane), and the facing direction (direction orthogonal to the stacking direction) between the first stacked surface 140R and the third stacked surface is the height direction (perpendicular to the rectangular plane). Z direction indicating the direction). Each direction is defined regardless of which surface of the battery stack is the installation surface. For this reason, for example, when the second stacked surface 140S becomes the installation surface, the opposing direction of the first stacked surface 140R and the third stacked surface is a horizontal direction with respect to the installation surface, but will be described as a height direction. .

<Partition member>
The partition member 6 is an electrical insulation member formed into a sheet shape from a resin having electrical insulation properties in order to electrically isolate the battery cells 5 adjacent in the stacking direction of the battery stack. For example, the partition member 6 is formed of a resin such as PBT (polybutylene terephthalate). The outer shape of the partition member 6 is formed so as to conform to the size and shape of the outer shape of the stacked surface (wide side surface) of the battery cell 5.

In addition, the partition members 6 disposed at both ends of the battery stack are electrically connected to each other in order to electrically isolate the battery cells 5 located at both ends of the battery stack in the stacking direction and end plates 7 described later. It is an electrical insulation member formed into a sheet shape from an insulating resin. The outer shape of the partition member 6 is formed so as to conform to the size and shape of the outer shape of the stacked surface (wide side surface 111W) of the battery cell 5 and the surface facing the end plate 7.
Thus, by making the partition member 6 into a sheet shape, the unit price can be reduced compared to a battery module in which the cell holder that holds the battery cell is the partition member. Moreover, the size of a battery laminated body can be reduced by making the partition member 6 into a sheet form. Further, by providing the joint member 19 with the function of aligning and holding each battery cell and the partition member, and the fixing function of the bus bar holder 11, the size of the entire battery module is reduced, and as a result, the size of the battery pack is also reduced. It becomes. Details of the joint member 19 will be described later.
On both ends of the opposing surfaces in the longitudinal direction (the same direction as the short direction of the battery stack) of the partition member 6 facing the stacking surface (wide side surface) of the battery cells 5 adjacent in the stacking direction of the battery stack A plurality of linear protrusions 121 projecting toward the battery cell 5 side from the center of the battery and extending continuously in the longitudinal direction have a plurality of predetermined intervals in the short direction (the same direction as the height direction of the battery stack). Open and formed. In the present embodiment, three protrusions 121 are formed at both ends in the longitudinal direction. In addition, the opposing surface of the partition member 6 which opposes the end plate 7 is a plane, and the protrusion is not provided.

  The protrusions 121 are provided at positions corresponding to both ends in the longitudinal direction of the wide side surface of the battery cell 5, and when the battery cells 5 are stacked, the both longitudinal ends of the wide side surface of the battery cell 5 are connected to the battery cell 5. It functions as a pressing part that is pressed with a pressure larger than the central part of the wide side surface. The part of the battery cell 5 that is pressed by the protrusion 121 is a position that deviates from the position where the mixture of the electricity storage elements is stacked, and does not affect the charge / discharge characteristics of the battery cell 5. The damage of the battery cell 5 due to pressurization can be prevented.

<End plate>
The end plate 7 is a metal block body that presses the battery stack from both ends in the stacking direction. The end plate 7 is cast by casting so that the outer shape conforms to the size and shape of the stack surface (wide side surface) of the battery cell 5. Molded.
A plurality of recesses 151 are formed in the central portion on the surface (inner side) of the end plate 7 facing the partition member 6. In the present embodiment, four recesses 151 are formed so that an array of 2 rows and 2 columns is formed in the central portion.

  On the surface opposite to the surface facing the partition member 6 of the end plate 7 (outside), irregularities are formed in the longitudinal direction (the same direction as the short direction of the battery stack). In the present embodiment, a thin portion (concave portion) is formed at the center in the longitudinal direction of the end plate 7, and a thick portion (convex portion) is formed at both longitudinal ends of the end plate 7. The dent surface of the thin part facing the stacking direction of the battery stack is a flat surface. The protruding surface of the thick part facing the stacking direction of the battery stack is a flat surface.

  The thick portion constitutes a screw fastening portion that is screwed in a state where the screw fastening portion of the side plate 10 and the end plate 7 is abutted, and a plurality of screw holes 155 into which the screws 154 are screwed are projected. Formed on the surface. In the present embodiment, two screw holes 155 are formed in each thick portion. A nut that can accommodate a nut on one end surface (on the first stacking surface 140R side of the battery stack) of the thick portion in the short direction (the same direction as the height direction of the battery stack) of the end plate 7 A storage part is formed. The nut storage portion is provided to receive the rotational torque received by the nut at the time of screw fastening by the end plate 7, and has a shape that can prevent rotation of the stored nut by screw fastening. In addition, a nut is demonstrated in detail in description of the bus-bar holder 11 mentioned later.

<Side plate>
The side plate 10 is screwed to the pair of end plates 7 in a state where the battery stack is pressed by the pair of end plates 7 so that the dimension in the stacking direction of the battery stack becomes a predetermined dimension, and the pair of ends It is a metal plate-like covering member that holds the pressed state of the battery stack by the plate 7, and is the entire length of the pair of second stack surfaces 140S of the battery stack and the longitudinal direction of the pair of end plates 7 (short of the battery stack). The same direction as the hand direction) covers the end faces facing both directions. An electrically insulating elastic sheet (not shown) is interposed between the entire surface of the pair of second stacked surfaces 140 </ b> S of the battery stack and the end surfaces of the pair of end plates 7 facing in the longitudinal direction and the side plate 10. Thus, the plurality of battery cells 5 are thermally connected to the side plate 10 while being electrically isolated from the side plate 10.

  Screw fastening portions 161 are formed at the edges of both ends of the side plate 10 in the longitudinal direction (the same direction as the longitudinal direction of the battery stack). The screw fastening portion 161 is bent inward (battery laminate side) at a right angle, and is abutted against the thick portion of the end plate 7 from the outside in the stacking direction of the battery laminate and is screwed to the thick portion.

  A battery module fixing portion 162 is formed at the edge of one side (the third stacked surface side of the battery stack) of the side plate 10 in the short direction (the same direction as the height direction of the battery stack). The battery module fixing portion 162 is bent outward at a right angle (opposite to the battery stack side), but is abutted against the bottom surface of the case body 2 and screwed to the case body 2. The battery module fixing part 162 has a plurality of semi-elliptical notches 163 into which a plurality of bolts (not shown) protruding from the bottom surface of the case body 2 toward the opening side of the case body 2 are inserted. 10 are formed at predetermined intervals in the longitudinal direction (the same direction as the longitudinal direction of the battery stack). In the present embodiment, three notches 163 are formed. When the nut is screwed into the bolt with the bolt inserted through the notch 163, the battery module fixing portion 162 is fastened and fixed to the bottom surface of the case body 2. Thereby, the battery module 100 is fixed to the case body 2. Further, the case main body 2 and the battery module fixing portion 162 are thermally connected.

  An engaging portion 164 is formed at the edge of the other side end (on the first stacking surface 140R side of the battery stack) of the side plate 10 in the short side direction (the same direction as the height direction of the battery stack). The engaging portion 164 is a portion that is engaged with the joint member 19 and functions as a fixing portion that fixes the bus bar holder 11 engaged with the joint member 19, and is a tip portion bent inward (battery stack side) at a right angle. And a connecting portion that extends straight from the main body portion of the side plate 10 toward the outside in the short-side direction and connects the tip portion and the main body portion of the side plate 10. A plurality of engagement holes 165 (through holes) through which the plurality of elastic engagement protrusions of the joint member 19 are inserted and hooked at the connecting portion of the engagement portion 164 are in the longitudinal direction of the side plate 10 (longitudinal direction of the battery stack). In the same direction) with a predetermined interval. In the present embodiment, four engagement holes 165 are formed. When the elastic engagement protrusion of the joint member 19 is inserted into the engagement hole 165 and is caught, the bus bar holder 11 engaged with the joint member 19 is fixed to the side plate 10.

<Bus bar holder>
The bus bar holder 11 is placed on the first stack surface 140R of the battery stack so as to cover the first stack surface 140R of the battery stack. The bus bar holder 11 is a molded body that is molded from a resin such as PP (polypropylene) or PPE (modified polyphenylene ether) so that the outer shape conforms to the size and shape of the first stacked surface 140R of the battery stack. Yes, it is engaged and fixed to a joint member 19 engaged with a pair of side plates 10.

  At both ends in the short direction of the bus bar holder 11 (the same direction as the short direction of the battery stack), the longitudinal direction of the bus bar holder 11 (the same as the long direction of the battery stack) corresponds to the terminal array of the battery stack. Direction) A pair of bus bar holding portions are provided from one side to the other side and have a plurality of bus bar storage portions divided by walls in the longitudinal direction of the bus bar holder 11. Each of the plurality of bus bar storage portions stores a bus bar that is joined to one positive terminal 53 and the other negative terminal 54 of the battery cell 5 adjacent in the stacking direction of the battery stack. Since welding is used to join the positive electrode terminal 53 and the negative electrode terminal 54 to the bus bar, an opening is formed on the battery stack side of the bus bar housing portion so that the bus bar is exposed to the battery stack side.

  Inside the pair of bus bar holding portions, a pair of wiring routing portions are provided extending from one side to the other side in the longitudinal direction of the bus bar holder 11 and for routing a plurality of lead wires connected to the plurality of bus bars. Has been.

  A gas is provided between the pair of wiring routing portions from one side to the other side in the longitudinal direction of the bus bar holder 11 and covers the battery stack so as to face the array of safety valves of the plurality of battery cells 5. A discharge part is formed.

  A plurality of elastic engagement protrusions 185 that are engaged with the joint member 19 are formed on the edges of both ends in the short direction of the bus bar holder 11 at predetermined intervals in the longitudinal direction of the bus bar holder 11. In the present embodiment, six elastic engagement protrusions 185 are formed on one end and the other end of the bus bar holder 11 in the short direction. The elastic engagement protrusion 185 is inserted into the engagement recess of the joint member 19 and is caught. Thereby, the bus bar holder 11 is engaged with the joint member 19 and is fixed to the side plate 10 with which the joint member 19 is engaged.

  The bus bar holding portion, the wiring routing portion, the gas discharge portion, and the elastic engagement protrusion are integrally formed by a resin mold.

<Joint material>
The joint member 19 is a molded body molded from a resin such as PP (polypropylene) or PPE (modified polyphenylene ether), for example, and the first laminated surface 140R and the second laminated surface 140S of the battery laminated body intersect at a right angle. It arrange | positions at a corner | angular part and is extended in the longitudinal direction of the battery laminated body along the corner | angular part.

  The side (inner side) of the joint member 19 that faces the battery stack has a shape that abuts on each of the first stack surface 140R and the second stack surface 140S of the battery stack, that is, an L-shaped cross-sectional shape in which two planes are orthogonal. ing.

  On the opposite side (outer side) of the joint member 19 to the battery stack, a first plane portion having a plane parallel to the first stack surface 140R of the battery stack, and the first stack of the battery stack. A second plane part having a plane parallel to the surface 140R and positioned lower than the first plane, and a plane parallel to the second laminated surface 140S, the short direction of the joint member 19 It is comprised from the 3rd plane part which cross | intersects at right angles to the edge of the 1st plane part in the one side of the (short direction of a battery laminated body) and the edge of the 2nd plane part in the transversal direction other side of the joint member 19. It has a stepped or stepped cross section.

  A plurality of engagement recesses 194 are formed in the first flat surface portion of the joint member 19 corresponding to the plurality of elastic engagement protrusions 185 that protrude toward the joint member 19 side from the short-side edge of the bus bar holder 11. Has been. If the short edge of the bus bar holder 11 is placed on the first flat surface portion 191 of the joint member 19 so as to abut against each other, each of the plurality of elastic engagement protrusions 185 of the bus bar holder 11 is associated with the corresponding engagement of the joint member 19. It is inserted into the concavity 194 and caught. Thereby, the bus bar holder 11 can be engaged with the joint member 19.

  A plurality of elastic engagement protrusions 195 projecting toward the side plate 10 are formed on the edge of the second flat portion 192 of the joint member 19 corresponding to the plurality of engagement holes 165 of the side plate 10. When the joint member 19 is pressed against the side plate 10 so that the front end portion of the side plate 10 abuts on the second flat portion of the joint member 19, each of the plurality of elastic engagement protrusions 195 of the joint member 19 is It is inserted into the corresponding engagement hole 165 of the plate 10 and caught. Thereby, the joint member 19 can be engaged with the side plate 10.

  The engagement order of the side plate 10, the bus bar holder 11, and the joint member 19 is as follows. First, the joint member 19 is disposed so as to contact each of the first laminated surface 140R and the second laminated surface 140S of the battery laminated body in which a plurality of battery cells 5 and partition members 6 are alternately laminated, and a pair of end plates 7 pressurizes and holds the battery stack. In this state, after engaging the joint member 19 with the side plate 10, the bus bar holder 11 is engaged with the joint member 19. According to this configuration, the first stacked surface 140R and the second stacked surface 140S of the battery stack are pressed by the joint member 19 having an L-shaped cross-section, whereby the planar direction positions of the plurality of battery cells 5 and the partition member 6 can be simplified. Can be aligned. In addition, even during and after assembly, since the three surfaces of the battery stack are held by the joint member 19, it is possible to prevent positional deviation in the vertical and horizontal directions. As described above, by using the joint member of the present embodiment, each battery cell 5 can be held and aligned with a simple structure with high accuracy and in a simple manner.

<Terminal block>
A perspective view of the terminal block is shown in FIGS. The terminal block 9 includes a negative HV terminal 21, a fan 22, and a circuit unit 12. The fan 22 is accommodated in a space provided in the lower center of the terminal block 9. The circuit unit 12 includes a circuit board, and is attached to a surface of the terminal block opposite to the battery module with bolts. The circuit board detects the voltage of each of the plurality of battery cells 5, the temperature of the predetermined battery cell 5, the voltage or current of the electrical connection body of the plurality of battery cells 5, and the like. Circuit elements and connectors for monitoring the state, controlling input / output (charging / discharging) of the battery module 100, and monitoring and controlling the entire battery pack 1 are mounted.

  The terminal block 9 is provided with a partition plate 24 and a protruding portion 25. The partition plate 24 closes the gap between the case body 2 and the projecting portion 25 is provided to close the gap between the battery module 100. The terminal block 9 is provided with an opening 26. The refrigerant sucked by the fan 22 moves to the flow path side formed by the battery module fixing portion 162 of the side plate and the case body 2 through the opening 26. Thereby, the inside air of the storage case of the battery pack 1 is circulated to cool the battery cells.

  In the battery module of the present embodiment, since the battery stack holding structure using the joint member 19 is adopted, the plurality of battery cells 5 and the side plate 10 are in contact with each other only through an electrically insulating elastic sheet for insulation. It has become a state. That is, it is not necessary to provide a member that inhibits heat transfer other than the electrically insulating elastic sheet between the battery cell 5 and the side plate 10. Therefore, the heat generated from the plurality of battery cells 5 is radiated through the side plate 10 in contact with the refrigerant sent from the fan 22, and the battery cells 5 can be efficiently cooled.

<Relay unit>
FIG. 8 and FIG. 9 show perspective views of the relay unit. The relay unit 8 includes a positive HV terminal 81, a fuse 82, and a relay 83. The relay unit 8 is a junction box electrically connected between the positive electrode side of the bus bar to which the plurality of battery cells 5 are connected and the HV terminal 81 on the positive electrode side, and is electrically connected to the plurality of battery cells 5. The electrical connection between the positive electrode side of the body and the positive electrode external terminal 4 is controlled by turning on and off the switch.

DESCRIPTION OF SYMBOLS 1 Battery pack 2 Case main body 3 Upper cover 5 Battery cell 6 Partition member 7 End plate 8 Relay unit 9 Terminal block 10 Side plate 11 Bus bar holder 12 Circuit unit 19 Joint member

Claims (5)

A plurality of battery cells and partition members are alternately stacked, and a terminal provided on the outer surface of the rectangular container of the plurality of battery cells is one of the stacked surfaces formed by stacking the battery cells and the partition members. A battery stack disposed on the first stacking surface,
A holding member that is provided on the first stack surface of the battery stack and holds a plurality of connection conductors that electrically connect the plurality of terminals;
A lashing member lashing the battery stack;
A fixing member that fixes the holding member to the lashing member,
The partition member is a sheet shape that is electrically isolated between battery cells adjacent to each other in the stacking direction of the battery stack, and whose outer shape conforms to the size and shape of the outer shape of the stacked surface of the battery cells. Is an electrical insulation member of
The lashing member is
A pair of first securing members that are arranged corresponding to the end faces at both ends in the stacking direction of the battery stack, and press the end faces from both sides in the stacking direction of the battery stack;
A second lashing member disposed corresponding to the pair of second lamination surfaces intersecting with the first lamination surface, extending in the lamination direction of the battery stack, and fixed to the pair of first lashing members; Have
The fixing member is provided at a corner where the first stacking surface and the second stacking surface intersect and is continuous in the stacking direction of the battery stack, and each of the holding member and the second securing member Engaging the holding member to the second securing member,
A battery module. The battery module according to claim 1,
The fixing member is
Extending from one end to the other end in the stacking direction of the battery stack,
A first contact portion that contacts an edge of the first laminated surface;
A second contact portion that contacts the edge of the second laminated surface,
A battery module. The battery module according to claim 2,
The fixing member and the second lashing member are engaged by an elastic engagement protrusion provided on the fixing member being inserted and caught in an engagement hole provided in the second lashing member,
The fixing member and the holding member are engaged by an elastic engagement protrusion provided on the holding member being inserted and caught in an engagement recess provided on the fixing member.
A battery module. The battery module according to any one of claims 1 to 3,
The partition member is formed with protrusions projecting toward the laminated surface side of the battery cell from the center part at both ends in the longitudinal direction of the surface facing the battery cell.
A battery module. The battery module according to any one of claims 1 to 4,
A positive external terminal electrically connected to the positive electrode side of the connection conductor;
A negative external terminal electrically connected to the negative side of the connection conductor;
A relay unit for controlling electrical connection between the positive external terminal and the positive side of the connection conductor;
A circuit unit for detecting a voltage of each of the plurality of battery cells and monitoring a state of the plurality of battery cells;
A storage container having an opening, and storing the battery module, the relay unit, and the circuit unit;
With the positive electrode external terminal and the negative electrode external terminal exposed to the outside, a lid that closes the opening of the storage container,
In the container, the positive external terminal and the relay unit are disposed in a region facing one end of the battery module in the stacking direction of the battery stack, and the battery in the stacking direction of the battery stack. The negative electrode exterior and the circuit unit are disposed in a region facing the other end of the module.
A battery pack characterized by that.

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