Battery pack

Abstract

To provide a battery pack of a cell-to-pack system, capable of strongly fixing both members arranged to a circumference of a plurality of battery cells.SOLUTION: A battery pack comprises: a plurality of laminated battery cells 11; a case side part 23 that includes a vertical plate part 27 that is contacted to the battery cell 11 in a lamination direction of the battery cells 11, and to which a reaction force in the lamination direction of each battery cells 11 is applied from the plurality of battery cells 11, and a lateral plate part 26 protruding in a direction of the reaction force from the vertical plate part 27; a plate member 31 that is overlapped with the lateral plate part 26 in a thickness direction of the lateral plate part 26; and a connection member 50 that connects the lateral plate part 26 to the plate member 31.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This invention relates to a battery pack.

Background Art

[0002] For example, International Publication No. 2016 / 174855 (Patent Document 1) discloses a power supply device including a battery laminate in which a plurality of secondary battery cells are laminated, end plates that cover both end faces of the battery laminate, and a battery fastening member that sandwiches the battery laminate between the end plates.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As a structure of a battery pack, there are a module method in which a module is formed by integrally restraining a plurality of battery cells between end plates and then the modules are combined to form a pack, and a cell-to-pack method in which a plurality of battery cells are combined to directly form a pack. In the cell-to-pack method, since the restraining force of a plurality of battery cells acts as a reaction force on the periphery of the plurality of battery cells, it is required that members arranged around the plurality of battery cells be firmly fixed to each other.

[0005] Therefore, an object of this invention is to solve the above problems, and to provide a battery pack capable of firmly fixing members arranged around a plurality of battery cells in a cell-to-pack type battery pack.

Means for Solving the Problems

[0006] [1] A battery pack comprising: a plurality of battery cells to be stacked; a vertical plate portion that abuts against the battery cells in the stacking direction of the battery cells and to which a reaction force in the stacking direction of the battery cells is applied from the plurality of battery cells; a first member having a horizontal plate portion that protrudes from the vertical plate portion in the direction of the reaction force; a second member that is overlapped with the horizontal plate portion in the thickness direction of the horizontal plate portion; and a connecting member that connects the horizontal plate portion to the second member.

[0007] According to the battery pack configured as described above, by providing the horizontal plate portion on the first member, the horizontal plate portion is connected to the second member by the connecting member. Thereby, it becomes possible to fix the first member and the second member while receiving the reaction force from the plurality of battery cells by the connecting member. Therefore, in a Cell-to-Pack type battery pack, the first member and the second member can be firmly fixed.

[0008] [2] The battery pack according to [1], further comprising a resin member made of resin and inserted into a part or the whole between the horizontal plate portion and the second member.

[0009] According to the battery pack configured as described above, by sealing the space between the horizontal plate portion and the second member with the resin member made of resin, it is possible to prevent foreign matter from entering the plurality of battery cells.

[0010] [3] The battery pack according to [2], wherein the resin member is an adhesive.

[0011] According to the battery pack configured as described above, the reaction force from the plurality of battery cells can be received by the adhesive in addition to the connecting member.

[0012] [4] The battery pack according to any one of [1] to [3], wherein the first member and the second member are made of the same type of metal.

[0013] According to the battery pack configured as described above, since the material metal is the same for the first member and the second member, there is no difference in the linear expansion coefficient, and it is difficult for a difference to occur in the amount of thermal deformation of the first member and the second member. For this reason, it is difficult for distortion due to a change in the ambient temperature to occur in the structure of the battery pack.

[0014] [5] The battery pack according to any one of [1] to [3], wherein the first member is made of metal and the second member is made of a different type of metal from the first member.

[0015] According to the battery pack configured as described above, the first member made of metal and the second member made of a different type of metal from the first member can be firmly fixed. Further, in a configuration in which the battery pack is made of resin and further includes a resin member inserted between a part or the entire surface between the horizontal plate portion and the second member, when a difference occurs in the amount of thermal deformation of the first member and the second member due to a difference in the linear expansion coefficient of the material metal, the difference in the amount of deformation can be absorbed by the resin member.

[0016] [6] The battery pack according to any one of [1] to [5], wherein the connection member includes a bolt, a flow drill screw, a pin, or a rivet.

[0017] According to the battery pack configured as described above, the reaction force from a plurality of battery cells can be received by a bolt, a flow drill screw, a pin, or a rivet.

[0018] [7] The battery pack according to [1], wherein the connection member includes an adhesive inserted between the horizontal plate portion and the second member, and a bent portion that is bent 90° from the tip of the second member in the direction of the reaction force and against which the horizontal plate portion abuts in the direction of the reaction force.

[0019] According to the battery pack configured as described above, the reaction force from a plurality of battery cells can be received by the bent portion of the second member and the adhesive.

Advantages of the Invention

[0020] As described above, according to this invention, in a cell-to-pack type battery pack, it is possible to provide a battery pack capable of firmly fixing members arranged around a plurality of battery cells to each other.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0022] Embodiments of this invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same numbers.

[0023] FIG. 1 is an exploded perspective view of a battery pack according to an embodiment of the present invention. FIG. 2 is a perspective view showing a battery cell constituting the battery pack in FIG. 1. FIG. 3 is a cross-sectional view showing the battery pack as viewed in the arrow direction on line III-III in FIG. 1.

[0024] Referring to FIGS. 1 to 3, the battery pack 100 is used as a driving power source for vehicles such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or a battery electric vehicle (BEV).

[0025] In this specification, for the sake of convenience in explaining the structure of the battery pack 100, an axis extending in the stacking direction of a plurality of battery cells 11 described later and in the horizontal direction is referred to as the "Y-axis", an axis extending in a direction orthogonal to the Y-axis and in the horizontal direction is referred to as the "X-axis", and an axis extending in the vertical direction is referred to as the "Z-axis".

[0026] First, the overall structure of the battery pack 100 will be described. The battery pack 100 has a plurality of battery cells 11. The plurality of battery cells 11 are stacked in the Y-axis direction. The battery cell 11 is a lithium-ion battery. The battery cell 11 is rectangular and has a thin plate shape of a rectangular parallelepiped. The plurality of battery cells 11 are stacked such that the Y-axis direction becomes the thickness direction of the battery cell 11.

[0027] The battery cell 11 has an exterior body 12. The exterior body 12 is formed of a rectangular parallelepiped-shaped housing and forms the appearance of the battery cell 11. An electrode body and an electrolytic solution are housed in the exterior body 12.

[0028] The exterior body 12 has a first side surface 13, a second side surface 14, a top surface 15, and a bottom surface 16. Each of the first side surface 13 and the second side surface 14 is formed of a plane orthogonal to the Y-axis. The first side surface 13 and the second side surface 14 face opposite sides in the Y-axis direction. Each of the first side surface 13 and the second side surface 14 has the largest area among the plurality of side surfaces of the exterior body 12.

[0029] Each of the top surface 15 and the bottom surface 16 is a plane orthogonal to the Z-axis. The top surface 15 faces upward. The bottom surface 16 faces downward. A gas discharge valve 17 is provided on the top surface 15 for discharging the gas generated inside the exterior body 12 to the outside of the exterior body 12 when the internal pressure of the exterior body 12 becomes a predetermined value or more due to the gas generated inside the exterior body 12.

[0030] The battery cell 11 further has electrode terminals 18 in which a positive electrode terminal 18P and a negative electrode terminal 18N are paired. The electrode terminals 18 are provided on the top surface 15. The positive electrode terminal 18P and the negative electrode terminal 18N are provided apart from each other in the X-axis direction. The positive electrode terminal 18P and the negative electrode terminal 18N are provided on both sides of the gas discharge valve 17 in the X-axis direction, respectively.

[0031] Among the plurality of battery cells 11 adjacent to each other in the Y-axis direction, the first side surfaces 13 face each other, and the second side surfaces 14 face each other so as to be laminated. Thereby, in the Y-axis direction in which the plurality of battery cells 11 are laminated, the positive electrode terminals 18P and the negative electrode terminals 18N are arranged alternately. Between the battery cells 11, 11 adjacent to each other in the Y-axis direction, the positive electrode terminals 18P and the negative electrode terminals 18N arranged in the Y-axis direction are connected to each other by a bus bar (not shown). The plurality of battery cells 11 are electrically connected in series to each other.

[0032] A cell stack 10 (10A, 10B) is constituted by a plurality of battery cells 11 laminated in the Y-axis direction. The cell stack 10 has a rectangular parallelepiped shape. As a typical example, the length of the cell stack 10 in the Y-axis direction is larger than the length of the cell stack 10 in the Z-axis direction and larger than the length of the cell stack 10 in the X-axis direction. The cell stack 10A and the cell stack 10B are arranged side by side in the X-axis direction with a space therebetween.

[0033] The battery pack 100 further includes a case body 21. The case body 21 is generally composed of a box having a rectangular parallelepiped appearance. A plurality of battery cells 11 are accommodated inside the case body 21 (internal space 70).

[0034] The case body 21 has a plate member 31, a pair of case side portions 23, a pair of case side portions 24, a case top portion 25, and a case bottom portion 22. The plate member 31, together with the pair of case side portions 23, the pair of case side portions 24, and the case top portion 25, partitions and forms the internal space 70. The case bottom portion 22 is disposed at the bottom of the case body 21. The plate member 31 is disposed between the internal space 70 and the case bottom portion 22 in the vertical direction.

[0035] The plate member 31 is made of a plate material with the Z-axis direction being the thickness direction and is disposed parallel to the X-axis - Y-axis plane. The plate member 31 is a cooling plate for dissipating the heat generated by the battery cell 11 to the outside. A refrigerant passage through which the refrigerant flows may be provided inside the plate member 31.

[0036] The internal space 70 is surrounded horizontally by the pair of case side portions 23 and the pair of case side portions 24. The pair of case side portions 23 face each other in the Y-axis direction with the internal space 70 therebetween. The pair of case side portions 24 face each other in the X-axis direction with the internal space 70 therebetween. The pair of case side portions 23 and the pair of case side portions 24 rise upward from the periphery of the case bottom portion 22 and form an opening at the tip. The case top portion 25 faces the plate member 31 with the internal space 70 therebetween in the Z-axis direction. The case top portion 25 closes the opening formed by the upper end portions of the case side portions 23.

[0037] The case body 21 is formed of metal. The plate member 31 is formed of a different type of metal from the case side portions 23, 24 and the case bottom portion 22. The thermal conductivity of the metal forming the plate member 31 is greater than the thermal conductivity of the metal forming the case side portions 23, 24 and the case bottom portion 22. The linear expansion coefficient of the metal forming the plate member 31 is greater than the linear expansion coefficient of the metal forming the case side portions 23, 24 and the case bottom portion 22. As an example, the plate member 31 is formed of aluminum, and the case side portions 23, 24 and the case bottom portion 22 are formed of iron (steel plate).

[0038] The plurality of battery cells 11 are placed on the plate member 31. The plate member 31 is thermally connected to the plurality of battery cells 11. The plate member 31 is connected to the plurality of battery cells 11 so that heat transfer is possible between the plurality of battery cells 11 and the plate member 31.

[0039] The plurality of battery cells 11 are constrained by a pair of case side portions 23 at both ends in the Y-axis direction. The pair of case side portions 23 apply a restraining force (compressive force) in the Y-axis direction to the plurality of battery cells 11.

[0040] The case side portion 23 (corresponding to the "first member" in the present invention) has a vertical plate portion 27 and a horizontal plate portion 26. The vertical plate portion 27 is made of a plate material in which the Y-axis direction is the thickness direction and is arranged parallel to the X-axis - Z-axis plane. The vertical plate portion 27 extends in a strip shape such that the X-axis direction is the longitudinal direction. The vertical plate portion 27 is erected on the plate member 31. The vertical plate portion 27 is in contact with the battery cells 11 in the Y-axis direction, which is the stacking direction of the battery cells 11. As a result of the pair of case side portions 23 applying a restraining force in the Y-axis direction to the plurality of battery cells 11, a reaction force in the Y-axis direction from the plurality of battery cells 11 is applied to the vertical plate portion 27.

[0041] The horizontal plate portion 26 projects from the vertical plate portion 27 in the Y-axis direction to which the above reaction force is applied. The horizontal plate portion 26 is made of a plate material whose Z-axis direction is the thickness direction and which is arranged parallel to the X-axis - Y-axis plane. The horizontal plate portion 26 extends in a strip shape such that the X-axis direction is the longitudinal direction. The horizontal plate portion 26 projects from the lower end portion of the vertical plate portion 27 in a direction away from the plurality of battery cells 11 in the Y-axis direction. The plate member 31 (corresponding to the "second member" in the present invention) is overlapped with the horizontal plate portion 26 in the Z-axis direction which is the thickness direction of the horizontal plate portion 26. The plate member 31 is sandwiched between the case bottom portion 22 and the horizontal plate portion 26 in the Z-axis direction.

[0042] The battery pack 100 further includes a plurality of connection members 50. The connection members 50 connect the horizontal plate portion 26 to the plate member 31. The plurality of connection members 50 are provided at intervals from each other in the X-axis direction.

[0043] As shown in FIG. 3, the connection member 50 has a bolt 51 and a nut 56. In the horizontal plate portion 26, the plate member 31, and the case bottom portion 22, holes 41, holes 42, and holes 43 that communicate with each other in the Z-axis direction are provided, respectively. The shaft portion 53 of the bolt 51 is inserted through the hole 43, the hole 42, and the hole 41 from the side of the case bottom portion 22. The head portion 52 of the bolt 51 is in contact with the case bottom portion 22 in the Z-axis direction. The nut 56 is screwed onto the shaft portion 53 that projects from the horizontal plate portion 26 in the +Z-axis direction.

[0044] The size of the bolt 51 is, for example, M8 or more. Assuming an error that occurs during the assembly of the case body 21, the hole 41 provided in the horizontal plate portion 26 may have an elongated hole shape.

[0045] According to such a configuration, in the Cell-to-Pack type battery pack 100, while providing the horizontal plate portion 26 on the case side portion 23, the horizontal plate portion 26 is connected to the plate member 31 by the bolt 51 and the nut 56 constituting the connection member 50. Thereby, by the axial force generated in the connection member 50, while receiving the reaction force in the Y-axis direction from the plurality of battery cells 11 by the connection member 50, the case side portion 23 and the plate member 31 can be firmly fixed.

[0046] In the present embodiment, by configuring the connection member 50 with the bolt 51 and the nut 56, the connection member 50 can be simply configured, and the connection work of the horizontal plate portion 26, the plate member 31, and the case bottom portion 22 can be easily performed.

[0047] The battery pack 100 may further include a resin member 61. In this case, the resin member 61 can be inserted into a part or the entire surface between the horizontal plate portion 26 and the plate member 31. The resin member 61 forms a layer in which the Z-axis direction is the thickness direction and is arranged parallel to the X-axis - Y-axis plane.

[0048] The resin member 61 is made of resin. The resin member 61 may be a sealing material or an adhesive. The form of the sealing material is not particularly limited, and for example, it may be in the form of a sheet, grease, a gap filler, or a gel. The sealing material is composed of a material such as acrylic, urethane, silicone, or modified silicone. The adhesive is composed of a material such as epoxy, acrylic, urethane, silicone, or cyanoacrylate.

[0049] According to such a configuration, by sealing between the horizontal plate portion 26 and the plate member 31 with the resin member 61, it is possible to prevent foreign matter such as water or dust from entering the internal space 70 that houses the plurality of battery cells 11. Further, due to the difference in the linear expansion coefficient of the material metal, when a difference in the amount of thermal deformation occurs between the horizontal plate portion 26 and the plate member 31, and between the plate member 31 and the case bottom portion 22, the resin member 61 can absorb the difference. Further, when the resin member 61 is made of an adhesive, the resin member 61 receives a reaction force in the Y-axis direction from the plurality of battery cells 11 together with the connection member 50. Thereby, the case side portion 23 and the plate member 31 can be fixed more firmly.

[0050] Subsequently, various modified examples of the connection member 50 in FIG. 3 will be described. FIG. 4 is a cross-sectional view showing a first modified example of the connection member in FIG. 3. Referring to FIG. 4, the connection member 50 in this modified example further has a welded portion 57. The welded portion 57 connects the nut 56 to the horizontal plate portion 26. In such a configuration, assuming an error that occurs during the assembly of the case body 21, the hole 42 provided in the plate member 31 may have an elongated hole shape.

[0051] FIG. 5 is a cross-sectional view showing a second modified example of the connection member in FIG. 3. Referring to FIG. 5, the connection member 50 in this modified example further has a female screw portion 58. The female screw portion 58 is provided inside the hole 42 of the plate member 31 by insert molding. The shaft portion 53 of the bolt 51 is screwed into the female screw portion 58 in addition to the nut 56.

[0052] According to such a configuration, since a higher axial force can be obtained in the connection member 50, the case side portion 23 and the plate member 31 can be fixed more firmly. The error that occurs during the assembly of the case body 21 may be absorbed at the case bottom portion 22.

[0053] FIG. 6 is a cross-sectional view showing a third modification of the connecting member in FIG. 3. Referring to FIG. 6, in this modification, the shaft portion 53 of the bolt 51 is inserted through the holes 41, 42, and 43 from the side of the horizontal plate portion 26. The head portion 52 of the bolt 51 is in contact with the horizontal plate portion 26 in the Z-axis direction. The nut 56 is screwed onto the shaft portion 53 protruding in the -Z-axis direction from the case bottom portion 22. Assuming errors that occur during the assembly of the case body 21, the holes 42 and 43 provided in the plate member 31 and the case bottom portion 22 may have an elongated hole shape.

[0054] FIG. 7 is a cross-sectional view showing a fourth modification of the connecting member in FIG. 3. Referring to FIG. 7, the connecting member 50 in this modification has a flow drill screw 81. The flow drill screw 81 connects the horizontal plate portion 26 and the plate member 31. The flow drill screw 81 is mechanically connected to the plate member 31 softened by the frictional heat generated at that time by being inserted into the plate member 31 while rotating at high speed.

[0055] According to such a configuration, compared with the case where a bolt is used for the connecting member 50, it is possible to improve the durability against shear force and suppress the loosening of the connection between the horizontal plate portion 26 and the plate member 31 over time.

[0056] FIG. 8 is a cross-sectional view showing a fifth modification of the connecting member in FIG. 3. Referring to FIG. 8, the connecting member 50 in this modification has a pin 82. The pin 82 is provided integrally with the case side portion 23. The pin 82 protrudes in the -Z-axis direction from the horizontal plate portion 26. The pin 82 is inserted into the holes 42 and 43. The resin member 61 is made of an adhesive and receives the reaction force in the Y-axis direction from the plurality of battery cells 11 together with the pin 82. Assuming errors that occur during the assembly of the case body 21, the hole 42 provided in the plate member 31 may have an elongated hole shape.

[0057] According to such a configuration, by forming the connection member 50 with the pin 82, the connection member 50 can be simply configured. Thereby, the manufacturing cost of the battery pack can be reduced.

[0058] FIG. 9 is a cross-sectional view showing a sixth modification of the connection member in FIG. 3. Referring to FIG. 9, the connection member 50 in this modification has a rivet 83. The rivet 83 is inserted into the holes 41, 42, and 43 and caulked at both ends in the Z-axis direction. Assuming an error that occurs during the assembly of the case body 21, the holes 42 and 43 provided in the plate member 31 and the case bottom 22 may have an elongated hole shape.

[0059] According to such a configuration, by forming the connection member 50 with the rivet 83, the connection member 50 can be simply configured and the connection work of the horizontal plate portion 26, the plate member 31, and the case bottom 22 can be easily performed.

[0060] FIG. 10 is a cross-sectional view showing a seventh modification of the connection member in FIG. 3. Referring to FIG. 10, the connection member 50 in this modification has a bent portion 33 and an adhesive 66.

[0061] The bent portion 33 is provided integrally with the plate member 31. The bent portion 33 is bent 90° from the tip of the plate member 31 in the Y-axis direction. The bent portion 33 is bent in the +Z-axis direction from the tip of the plate member 31. The length of the bent portion 33 in the Z-axis direction is equal to or greater than the total thickness of the horizontal plate portion 26 and the adhesive 66 in the Z-axis direction. The horizontal plate portion 26 is in contact with the bent portion 33 in the Y-axis direction.

[0062] The adhesive 66 is provided in the same form as the resin member 61 interposed between the horizontal plate portion 26 and the plate member 31. The adhesive 66 receives the reaction force in the Y-axis direction from the plurality of battery cells 11 together with the bent portion 33.

[0063] According to such a configuration, by forming the connection member 50 with the adhesive 66 and the bent portion 33, the connection member 50 can be simply configured, and the connection work of the horizontal plate portion 26, the plate member 31, and the case bottom portion 22 can be easily performed.

[0064] FIG. 11 is a cross-sectional view showing an eighth modification of the connection member in FIG. 3. Referring to FIG. 11, in this modification, the entire plate member 31 is housed in the internal space 70. The case bottom portion 22 (corresponding to the "second member" in the present invention in this modification) is overlapped with the horizontal plate portion 26 via the resin member 61 in the Z-axis direction.

[0065] The connection member 50 connects the horizontal plate portion 26 to the case bottom portion 22. The connection member 50 has a bolt 51 and a nut 56. The shaft portion 53 of the bolt 51 is inserted through the hole 43 and the hole 41 from the side of the horizontal plate portion 26. The head portion 52 of the bolt 51 is in contact with the horizontal plate portion 26 in the Z-axis direction. The nut 56 is screwed onto the shaft portion 53 protruding from the case bottom portion 22 in the -Z axis direction.

[0066] According to such a configuration, in order to connect the horizontal plate portion 26 and the case bottom portion 22 made of the same kind of metal, it is not necessary to consider the difference in the amount of thermal deformation caused by the difference in the linear expansion coefficient of the material metal.

[0067] The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0068] 10, 10A, 10B cell stack, 11 battery cell, 12 exterior body, 13 first side surface, 14 second side surface, 15 top surface, 16 bottom surface, 17 gas discharge valve, 18 electrode terminal, 18N negative electrode terminal, 18P positive electrode terminal, 21 case body, 22 case bottom, 23, 24 case side portions, 25 case top, 26 horizontal plate portion, 27 vertical plate portion, 31 plate member, 33 bending portion, 41, 42, 43 holes, 50 connecting member, 51 bolt, 52 head portion, 53 shaft portion, 56 nut, 57 welded portion, 58 female screw portion, 61 resin member, 66 adhesive, 70 internal space, 81 flow drill screw, 83 rivet, 100 battery pack.

Claims

1. A plurality of battery cells to be stacked, a pair of first case side portions facing each other in the stacking direction of the battery cells, a pair of second case side portions facing each other in a direction orthogonal to the stacking direction of the battery cells, a case bottom portion, a plate member disposed on the case bottom portion, and a case top portion facing the case bottom portion in the vertical direction, and a case body including the same, the pair of first case side portions, the pair of second case side portions, the case bottom portion, the plate member, and the case top portion form a box shape that forms an internal space for accommodating the plurality of battery cells, the plurality of battery cells are placed on the plate member, each of the first case side portions corresponds to a first member, the first member has a vertical plate portion that abuts on the battery cells in the stacking direction of the battery cells and on which a reaction force in the stacking direction of the battery cells is applied from the plurality of battery cells, and a horizontal plate portion that projects from the vertical plate portion in the direction of the reaction force, the plate member corresponds to a second member, the second member is superposed on the horizontal plate portion in the thickness direction of the horizontal plate portion, and further, a battery pack including a connecting member that connects the horizontal plate portion to the second member.

2. The battery pack according to claim 1, further comprising a resin member made of resin and inserted into a part or the whole between the horizontal plate portion and the second member.

3. The battery pack according to claim 2, wherein the resin member is an adhesive.

4. The battery pack according to any one of claims 1 to 3, wherein the first member and the second member are made of the same type of metal.

5. The first member is made of metal, The battery pack according to any one of claims 1 to 3, wherein the second member is made of a different type of metal from the first member.

6. The battery pack according to any one of claims 1 to 3, wherein the connecting member includes a bolt, a flow drill screw, a pin, or a rivet.

7. A plurality of battery cells to be stacked, a first member having a vertical plate portion that abuts on the battery cells in the stacking direction of the battery cells and on which a reaction force in the stacking direction of the battery cells is applied from the plurality of battery cells, and a horizontal plate portion that projects from the vertical plate portion in the direction of the reaction force, a second member superposed on the horizontal plate portion in the thickness direction of the horizontal plate portion, and a connecting member that connects the horizontal plate portion to the second member, the connecting member is An adhesive interposed between the horizontal plate portion and the second member, A battery pack including a bent portion that is bent 90° from the tip of the second member in the direction of the reaction force and against which the horizontal plate portion abuts in the direction of the reaction force. **Claim 8**: A plurality of battery cells to be stacked, A case body including a pair of first case side portions facing each other in the stacking direction of the battery cells, a pair of second case side portions facing each other in a direction orthogonal to the stacking direction of the battery cells, a case bottom portion, a plate member disposed on the case bottom portion, and a case top portion facing the case bottom portion in the vertical direction. The pair of first case side portions, the pair of second case side portions, the case bottom portion, the plate member, and the case top portion form a box shape that forms an internal space for accommodating the plurality of battery cells. The plurality of battery cells are placed on the plate member. Each of the first case side portions corresponds to a first member. The first member has a vertical plate portion that abuts against the battery cells in the stacking direction of the battery cells and against which a reaction force in the stacking direction of the battery cells is applied from the plurality of battery cells, and a horizontal plate portion that projects from the vertical plate portion in the direction of the reaction force. The case bottom portion corresponds to a second member. The second member is superposed on the horizontal plate portion in the thickness direction of the horizontal plate portion, and further, A battery pack including a connecting member that connects the horizontal plate portion to the second member.

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