Battery pack and method for manufacturing the same

Abstract

To provide a battery pack in which the mounting efficiency of a stack of battery cells is improved, and a manufacturing method thereof.SOLUTION: A battery pack includes a first stack and a second stack, and a case member having an internal space for housing the first stack and the second stack, and side walls defining the internal space, and each of the first stack and the second stack includes a plurality of battery cells aligned in a first direction, end plates at ends of the plurality of battery cells, and a restraining member that restrains the plurality of battery cells and the end plates along the first direction, and the first stack and the second stack are arranged to be aligned in a second direction perpendicular to the first direction, the end plates aligned in the second direction engage with each other, and the end plates continuously traverse the internal space along the second direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present technology relates to a battery pack and a method for manufacturing the same.

Background Art

[0002] A battery pack configured by housing a laminate including a plurality of battery cells in a case has been conventionally known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Summary of the Invention

Problems to be Solved by the Invention

[0004] It is required to improve the mounting efficiency of the laminate housed in the case while ensuring the strength of the case. Conventional battery packs do not necessarily have a sufficient configuration from the above viewpoints.

[0005] An object of the present technology is to provide a battery pack in which the mounting efficiency of a laminate of battery cells is improved and a method for manufacturing the same.

Means for Solving the Problems

[0006] The present technology provides the following battery pack and a method for manufacturing the same.

[0007] [1] A battery pack comprising a first laminate and a second laminate, a case member having an internal space for housing the first laminate and the second laminate, and side walls defining the internal space, wherein the first laminate and the second laminate each include a plurality of battery cells arranged in a first direction, end plates at the ends of the plurality of battery cells, and a restraining member for restraining the plurality of battery cells and the end plates along the first direction, the first laminate and the second laminate are provided so as to be arranged in a second direction orthogonal to the first direction, the end plates arranged in the second direction engage with each other, and the end plates continuously cross the internal space along the second direction.

[0008] [2] A battery pack comprising a laminate including a plurality of battery cells, a case member having an internal space for housing the laminate, and side walls defining the internal space, wherein the laminate includes a plurality of battery cells arranged in a first direction, end plates at the ends of the plurality of battery cells, and a restraining member for restraining the plurality of battery cells and the end plates along the first direction, an end plate arranged in a second direction orthogonal to the first direction engages with the side wall, and the end plate continuously crosses the internal space along the second direction.

[0009] [3] The side walls include a pair of first side walls facing each other along the first direction and a pair of second side walls facing each other along the second direction, and the end plate is provided so as to reach from one of the pair of second side walls to the other at an intermediate position between the pair of first side walls in the first direction. The battery pack according to [1] or [2].

[0010] [4] The side walls include a pair of first side walls facing each other along the first direction and a pair of second side walls facing each other along the second direction, and the end plate is provided so as to reach from one of the pair of second side walls to the other at a position adjacent to at least one of the pair of first side walls. The battery pack according to [1] or [2].

[0011] [5]A battery pack includes a first laminate and a second laminate, a case member having an internal space for housing the first laminate and the second laminate, and side walls defining the internal space. The first laminate and the second laminate each include a plurality of battery cells arranged in a first direction, an intermediate plate located in the middle of the plurality of battery cells, and a restraining member for restraining the plurality of battery cells and the intermediate plate along the first direction. The first laminate and the second laminate are provided so as to be arranged in a second direction orthogonal to the first direction, intermediate plates arranged in the second direction engage with each other, and the intermediate plate continuously crosses the internal space along the second direction.

[0012] [6]A battery pack includes a laminate including a plurality of battery cells, a case member having an internal space for housing the laminate, and side walls defining the internal space. The laminate includes a plurality of battery cells arranged in a first direction, an intermediate plate located in the middle of the plurality of battery cells, and a restraining member for restraining the plurality of battery cells and the intermediate plate along the first direction. An intermediate plate arranged in a second direction orthogonal to the first direction engages with the side wall, and the intermediate plate continuously crosses the internal space along the second direction.

[0013] [7]The first laminate and the second laminate are formed to be elastically deformable along the first direction, the battery pack according to [1], or [3] to [5].

[0014] [8]The laminate is formed to be elastically deformable along the first direction, the battery pack according to [2] to [4], or [6].

[0015] [9] A method for manufacturing the battery pack according to [1], or [3] to [5], comprising the steps of preparing a plate member having heat dissipation properties, preparing a first laminate and a second laminate, providing the first laminate and the second laminate on the plate member such that the first laminate and the second laminate are arranged in a second direction, attaching side walls to the plate member so as to sandwich the first laminate and the second laminate along a first direction and a second direction, and closing the internal space by providing a lid member. A method for manufacturing a battery pack.

[0016]

[10] A method for manufacturing the battery pack according to [2] to [4], or [6], comprising the steps of preparing a plate member having heat dissipation properties, preparing a laminate, providing the laminate on the plate member, attaching side walls to the plate member so as to sandwich the laminate along a first direction and a second direction, and closing the internal space by providing a lid member. A method for manufacturing a battery pack.

Effect of the Invention

[0017] According to the present technology, by making the end plate or the intermediate plate function as a part of the structural material of the case member, the rigidity of the case member can be improved without adding other members. As a result, the internal space of the case member is enlarged, and the mounting efficiency of the laminate including a plurality of battery cells can be improved.

Brief Description of the Drawings

[0018]

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Embodiments for Carrying Out the Invention

[0019] Embodiments of the present technology will be described below. In cases where the same or corresponding parts are given the same reference numerals, the description thereof may not be repeated.

[0020] In the embodiments described below, when referring to the number, quantity, etc., unless otherwise specified, the scope of the present technology is not necessarily limited to such number, quantity, etc. Also, in the following embodiments, each component is not necessarily essential to the present technology, unless otherwise specified. Further, the present technology is not limited to necessarily achieving all of the effects described in the present embodiments.

[0021] In this specification, the descriptions of "comprise", "include", and "have" are in an open - ended format. That is, when a certain configuration is included, other configurations outside of the said configuration may or may not be included.

[0022] Also, in this specification, when geometric terms and terms representing positional and directional relationships, such as "parallel", "orthogonal", "diagonal 45°", "coaxial", "along", etc., are used, these terms allow for manufacturing errors or slight variations. When terms representing relative positional relationships such as "upper side" and "lower side" are used in this specification, these terms are used to indicate the relative positional relationship in one state, and the relative positional relationship can be reversed or rotated at an arbitrary angle depending on the installation direction of each mechanism (for example, turning the entire mechanism upside down, etc.).

[0023] In this specification, "battery" is not limited to lithium - ion batteries, and may include other batteries such as nickel - metal hydride batteries and sodium - ion batteries.

[0024] In this specification, a "battery cell" can be mounted on a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), etc. However, the use of the "battery cell" is not limited to in-vehicle use.

[0025] FIG. 1 is a perspective view of the battery pack 300. The battery pack 300 shown in FIG. 1 includes battery cells 100 and separators 200 (inter-cell separators). The battery cells 100 and the separators 200 are alternately arranged along the Y-axis direction (the first direction).

[0026] The battery cells 100 are rectangular battery cells, and a plurality of them are provided along the Y-axis direction. The plurality of battery cells 100 are electrically connected to each other via a bus bar (not shown).

[0027] The separators 200 are provided between the plurality of battery cells 100. The separators 200 prevent unintentional electrical conduction between adjacent battery cells 100. The separators 200 ensure the electrical insulation between adjacent battery cells 100.

[0028] FIG. 2 is a perspective view of the battery cell 100. As shown in FIG. 2, the battery cell 100 has a rectangular shape. The battery cell 100 has an electrode terminal 110, a battery case 120, and a gas discharge valve 130.

[0029] The electrode terminal 110 is formed on the battery case 120. The electrode terminal 110 has a positive electrode terminal 111 and a negative electrode terminal 112 arranged along the X-axis direction (the second direction) orthogonal to the Y-axis direction (the first direction). The positive electrode terminal 111 and the negative electrode terminal 112 are provided apart from each other in the X-axis direction.

[0030] The battery case 120 has a rectangular parallelepiped shape and forms the exterior of the battery cell 100. The battery case 120 includes a case body 120A that houses an electrode body and an electrolytic solution (not shown), and a sealing plate 120B that seals the opening of the case body 120A. The sealing plate 120B is joined to the case body 120A by welding.

[0031] The battery case 120 has an upper surface 121, a lower surface 122, a first side surface 123, a second side surface 124, and two third side surfaces 125.

[0032] The upper surface 121 is a plane orthogonal to the Z-axis direction (the third direction) that is orthogonal to the Y-axis direction and the X-axis direction. An electrode terminal 110 is disposed on the upper surface 121. The lower surface 122 faces the upper surface 121 along the Z-axis direction.

[0033] Each of the first side surface 123 and the second side surface 124 consists of a plane orthogonal to the Y-axis direction. Each of the first side surface 123 and the second side surface 124 has the largest area among the plurality of side surfaces that the battery case 120 has. Each of the first side surface 123 and the second side surface 124 has a rectangular shape when viewed in the Y-axis direction. Each of the first side surface 123 and the second side surface 124 has a rectangular shape in which the X-axis direction is the longitudinal direction and the Z-axis direction is the short-side direction when viewed in the Y-axis direction.

[0034] The plurality of battery cells 100 are stacked such that the first side surfaces 123 face each other and the second side surfaces 124 face each other between the battery cells 100 adjacent to each other in the Y-axis direction. As a result, the positive electrode terminals 111 and the negative electrode terminals 112 are arranged alternately in the Y-axis direction in which the plurality of battery cells 100 are stacked.

[0035] The gas discharge valve 130 is provided on the upper surface 121. The gas discharge valve 130 discharges the gas inside the battery case 120 to the outside of the battery case 120 when the temperature of the battery cell 100 rises (thermal runaway) and the internal pressure of the battery case 120 becomes a predetermined value or more due to the gas generated inside the battery case 120.

[0036] FIG. 3 is a top view showing a state in which the assembled batteries 300A, 300B, 300C, and 300D are housed in the case member 500 of the battery pack 1. FIG. 4 is a top view showing the plurality of assembled batteries 300A, 300B, 300C, and 300D shown in FIG. 3. FIG. 5 is a view showing a state in which the case member 500 is disassembled into a bottom surface and side walls.

[0037] As shown in FIGS. 3 and 4, the battery pack 1 includes the assembled battery 300A and end plates 400A (first laminate) provided at both ends thereof, the assembled battery 300B and end plates 400B (second laminate) provided at both ends thereof, the assembled battery 300C and end plates 400C (third laminate) provided at both ends thereof, and the assembled battery 300D and end plates 400D (fourth laminate) provided at both ends thereof.

[0038] The assembled battery 300A and the end plate 400A, and the assembled battery 300B and the end plate 400B are provided so as to be arranged in the X-axis direction (second direction). Similarly, the assembled battery 300C and the end plate 400C, and the assembled battery 300D and the end plate 400D are provided so as to be arranged in the X-axis direction.

[0039] The assembled battery 300A and the end plate 400A, and the assembled battery 300C and the end plate 400C are provided so as to be arranged in the Y-axis direction (first direction). Similarly, the assembled battery 300B and the end plate 400B, and the assembled battery 300D and the end plate 400D are provided so as to be arranged in the Y-axis direction.

[0040] The case member 500 includes a pair of first side walls 510 facing each other along the Y-axis direction, and a pair of second side walls 520 facing each other along the X-axis direction. The first side wall 510 and the second side wall 520 define the internal space of the case member 500.

[0041] One end plate 400A (the left side in the figure) provided at both ends of the battery pack 300A is continuously provided with the end plate 400B at a position adjacent to the first side wall 510. As a result, at the position adjacent to the first side wall 510, the end plates 400A and 400B continuously cross the internal space of the case member 500 along the X-axis direction, reaching from one second side wall 520 to the other second side wall 520.

[0042] The other end plate 400A (the right side in the figure) is continuously provided with the end plate 400B at an intermediate position between the pair of first side walls 510. As a result, at the intermediate position between the pair of first side walls 510, the end plates 400A and 400B continuously cross the internal space of the case member 500 along the X-axis direction, reaching from one second side wall 520 to the other second side wall 520.

[0043] Similarly, one end plate 400C (the right side in the figure) provided at both ends of the battery pack 300C is continuously provided with the end plate 400D at a position adjacent to the first side wall 510. As a result, at the position adjacent to the first side wall 510, the end plates 400C and 400D continuously cross the internal space of the case member 500 along the X-axis direction, reaching from one second side wall 520 to the other second side wall 520.

[0044] Also, the other end plate 400C (the left side in the figure) is continuously provided with the end plate 400D at an intermediate position between the pair of first side walls 510. As a result, at the intermediate position between the pair of first side walls 510, the end plates 400C and 400D continuously cross the internal space of the case member 500 along the X-axis direction, reaching from one second side wall 520 to the other second side wall 520.

[0045] As shown in FIG. 5, the pair of first side walls 510 and the pair of second side walls 520 are prepared as separate members and are each joined to the bottom surface 530. The pair of first side walls 510 are provided so as to face each other in the Y-axis direction, and the other pair of second side walls 520 are provided so as to face each other in the X-axis direction.

[0046] FIG. 6 is an exploded perspective view of the battery pack 1. FIGS. 7 to 12 are diagrams showing the respective steps of the manufacturing method of the battery pack 1. The manufacturing process of the battery pack 1 will be described with reference to FIGS. 6 to 12.

[0047] As shown in FIG. 6, the case member 500 for housing a plurality of battery modules 1A includes a first side wall 510, a second side wall 520, a bottom surface 530, and a lid member 540.

[0048] As shown in FIG. 7, the battery module 1A housed in the case member 500 includes a restraining member 600 that restrains the end plates 400 provided at both ends of the assembled battery 300 in the Y-axis direction, and a control board 700 provided on the assembled battery 300. The end plate 400 is formed so as to protrude more than the restraining member 600 in the X-axis direction.

[0049] As shown in FIG. 8, a bottom surface 530 (plate member) having heat dissipation properties is prepared. The bottom surface 530 can be formed of a metal such as aluminum, for example. As in the example of FIG. 8, a coolant 800 may be applied on the bottom surface 530. The coolant 800 can also function as an adhesive for temporarily fixing the battery module 1A fixed to the bottom surface 530 and the first side wall 510 and the second side wall 520. A refrigerant passage (not shown) may be formed in the bottom surface 530.

[0050] As shown in FIG. 9, a plurality of battery modules 1A are arranged along the X-axis direction and the Y-axis direction, respectively, and combined with each other. From that state, as shown in FIG. 10, the bottom surface 530 is attached from the bottom surface side (opposite side of the control board 700) of the battery module 1A.

[0051] Note that the number of battery modules 1A to be combined can be appropriately changed. In the examples of FIGS. 9 and 10, three battery modules 1A are arranged in the X-axis direction and the Y-axis direction, respectively. However, for example, a plurality of battery modules 1A may be arranged only in the Y-axis direction, or a plurality of battery modules 1A may be arranged only in the X-axis direction.

[0052] From the state of FIG. 10, as shown in FIG. 11, a pair of first side walls 510 are provided so as to sandwich the plurality of combined battery modules 1A in the Y-axis direction, and a pair of second side walls 520 are provided so as to sandwich the plurality of combined battery modules 1A in the X-axis direction. The first side walls 510 and the second side walls 520 are each mounted on the bottom surface 530. After the first side walls 510, the second side walls 520, and the bottom surface 530 are temporarily fixed to the bottom surface 530, they are joined to each other, for example, by welding.

[0053] After the first side walls 510 and the second side walls 520 are mounted on the bottom surface 530, as shown in FIG. 12, a lid member 540 is attached to the first side walls 510 and the second side walls 520. Thereby, the internal space of the case member 500 is closed.

[0054] As shown in FIG. 13, the end plates 400A and 400B that are continuously provided in the X-axis direction are engaged with each other. Similarly, the end plates 400C and 400D that are continuously provided in the X-axis direction are engaged with each other.

[0055] As schematically shown in FIG. 14, the end plates 400A and 400B are engaged with each other when the convex portion 410 provided at the tip of the end plate 400B fits into the concave portion 420 provided at the tip of the end plate 400A, and the movement in two directions (the X-axis direction and the Y-axis direction) is restricted. Similarly, the end plates 400C and 400D are engaged with each other when the convex portion 410 provided at the tip of the end plate 400C fits into the concave portion 420 provided at the tip of the end plate 400D, and the movement in two directions (the X-axis direction and the Y-axis direction) is restricted.

[0056] However, the scope of the present technology is not limited to the examples of FIGS. 13 and 14, and the shapes, numbers, arrangements, etc. of the convex portion 410 and the concave portion 420 can be appropriately changed.

[0057] As shown in FIG. 15, the end plates 400B and 400D that reach the second side wall 520 of the case member 500 are engaged with the second side wall 520.

[0058] As schematically shown in FIG. 16, by fitting the tips of the end plates 400B and 400D into the recess 520A provided in the second side wall 520, the end plates 400B and 400D are engaged with the second side wall 520, and the movement in two directions (X-axis direction and Y-axis direction) is restricted.

[0059] However, the scope of the present technology is not limited to the examples of FIGS. 15 and 16. For example, a structure may be employed in which a convex portion is provided on the side of the second side wall 520 and a concave portion is provided on the side of the end plate 400. Further, the shape, number, arrangement, etc. of the convex and concave portions can be appropriately changed.

[0060] In the battery pack 1 according to the present embodiment, the end plates 400 are engaged with each other, and the end plate 400 and the second side wall 520 are engaged with each other, so that the end plate 400 continuously crosses the internal space of the case member 500 along the X-axis direction. Therefore, the end plate 400 can function as a part of the structural material for reinforcing the case member 500.

[0061] FIG. 17 is a diagram showing a structure for restraining the assembled battery 300. FIG. 18 is an enlarged view showing the periphery of the engaging portion between the end plate 400 and the restraining member 600 in FIG. 17.

[0062] As shown in FIGS. 17 and 18, the laminate of the battery cells 100 and the separators 200 laminated in the Y-axis direction is sandwiched between two end plates 400. The battery cells 100 and the separators 200 are pressed by the end plates 400 and are restrained between the two end plates 400.

[0063] The end plates 400 are arranged at both ends of the laminate of the battery cells 100 and the separators 200 in the Y-axis direction. The restraining member 600 connects the two end plates 400 to each other.

[0064] The separator 200 can be formed of, for example, an elastically deformable rubber-like material. Thereby, the laminate of the battery cell 100 and the end plate 400 is formed to be elastically deformable along the Y-axis direction. This elastic deformation may occur, for example, on the entire laminate of the battery cell 100 and the end plate 400 on the order of about several millimeters.

[0065] With a compressive force in the Y-axis direction acting on the laminate of the battery cell 100 and the end plate 400, the restraining member 600 is fixed to the end plate 400. At this time, as shown in part A of FIG. 18, there is a slight gap at the engaging portion between the end plate 400 and the restraining member 600. After releasing the compressive force, a tensile force acts on the restraining member 600 that connects the two end plates 400. As a reaction, the restraining member 600 presses the two end plates 400 in a direction approaching each other.

[0066] FIG. 19 is a perspective view of a modified example of the battery module 1A. FIG. 20 is a cross-sectional view taken along line XX-XX in FIG. 19.

[0067] In the modified example shown in FIGS. 19 and 20, an intermediate plate 900 is provided in the intermediate portion in the Y-axis direction of the battery module 1A, and a convex portion 910 that can engage with another battery module 1A or the second side wall 520 of the case member 500 is provided on the intermediate plate 900.

[0068] As shown in FIG. 20, the convex portion 910 is provided so as to protrude outward in the X-axis direction from the restraining member 600. At the root portion of the convex portion 910, the restraining member 600 and the intermediate plate are engaged.

[0069] Also in this modified example, the end plate 400 protrudes outward in the X-axis direction from the restraining member 600. However, the convex portion 910 of the intermediate plate 900 protrudes more outward in the X-axis direction than the end plate 400.

[0070] According to the battery module 1A according to the modification shown in FIGS. 19 and 20, the intermediate plate 900 can function as part of a structural material for reinforcing the case member 500. Further, unevenness is provided at the tip of the intermediate plate 900 (similar to the end plates 400A, 400B, 400C, and 400D shown in FIGS. 13 to 16), and the intermediate plates 900 or the intermediate plate 900 and the case member 500 are engaged with each other to restrain relative movement in two directions (the X-axis direction and the Y-axis direction).

[0071] FIGS. 21 and 22 are graphs showing the stress-displacement relationships in the shear direction and the tensile direction of the coolant 800, respectively. As the coolant 800, for example, a silicone gap filler having a thermal conductivity of about 2.0 W / m·K and compressible after curing can be used. When the straight line 10A shown in FIG. 21 is the design target value of the stress-displacement relationship in the shear direction, a material having the characteristics shown by the curve 20A can be used. Also, when the straight line 10B in FIG. 22 is the design target value of the stress-displacement relationship in the tensile direction, a material having the characteristics shown by the curve 20B can be used. As a material having the characteristics shown by the curves 20A and 20B, for example, TC-5515 manufactured by Dow Corning can be used.

[0072] In the battery pack 1 according to the present embodiment, by causing the end plate 400 and the intermediate plate 900 (one or both) to function as part of the structural material of the case member 500 as described above, the rigidity of the case member 500 can be improved without adding other members. As a result, the internal space of the case member 500 is enlarged, and the mounting efficiency of the laminate including the plurality of battery cells 100 can be improved.

[0073] As described above, the embodiments of the present technology have been described. However, the embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present technology is indicated 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

[0074] 1 Battery pack, 1A Battery module, 10A, 10B Straight lines, 20A, 20B Curves, 100 Battery cells, 110 Electrode terminals, 111 Positive electrode terminal, 112 Negative electrode terminal, 120 Battery case, 120A Case body, 120B Sealing plate, 121 Upper surface, 122 Lower surface, 123 First side surface, 124 Second side surface, 125 Third side surface, 130 Gas discharge valve, 200 Separator, 300, 300A, 300B, 300C, 300D Battery packs, 400, 400A, 400B, 400C, 400D End plates, 410 Protrusions, 420 Recesses, 500 Case member, 510 First side wall, 520 Second side wall, 520A Recess, 530 Bottom surface, 540 Cover member, 600 Restraining member, 700 Control board, 800 Cooling material, 900 Intermediate plate, 910 Protrusion.

Claims

1. a first laminate and a second laminate; a case member having an internal space for housing the first laminate and the second laminate, and side walls defining the internal space; the first laminate and the second laminate each include: a plurality of battery cells arranged in a first direction; end plates at ends of the plurality of battery cells; and a restraining member for restraining the plurality of battery cells and the end plates along the first direction; the first laminate and the second laminate are provided so as to be arranged in a second direction orthogonal to the first direction; an end plate engaged with the end plates arranged in the second direction, and the end plate continuously crosses the internal space along the second direction, a battery pack.

2. a laminate including a plurality of battery cells; a case member having an internal space for housing the laminate and side walls defining the internal space; the laminate includes: a plurality of battery cells arranged in a first direction; end plates at ends of the plurality of battery cells; and a restraining member for restraining the plurality of battery cells and the end plates along the first direction; an end plate engaged with the side wall, and the end plate continuously crosses the internal space along the second direction, a battery pack.

3. the side walls include a pair of first side walls facing each other in the first direction and a pair of second side walls facing each other in the second direction; the end plate is provided so as to reach from one of the pair of second side walls to the other at an intermediate position in the first direction of the pair of first side walls, the battery pack according to claim 1 or claim 2.

4. The side walls include a pair of first side walls facing each other in the first direction and a pair of second side walls facing each other in the second direction. The end plate is provided so as to reach from one of the pair of second side walls to the other at a position adjacent to at least one of the pair of first side walls. The battery pack according to claim 1 or claim 2.

5. A first laminate and a second laminate, A case member having an internal space for housing the first laminate and the second laminate, and side walls defining the internal space. The first laminate and the second laminate, A plurality of battery cells arranged in a first direction, An intermediate plate in the middle of the plurality of battery cells, Each including a restraining member that restrains the plurality of battery cells and the intermediate plate along the first direction. The first laminate and the second laminate are provided so as to be arranged in a second direction orthogonal to the first direction. The intermediate plates arranged in the second direction engage with each other, and the intermediate plate continuously crosses the internal space along the second direction. The battery pack.

6. A laminate including a plurality of battery cells, A case member having an internal space for housing the laminate and side walls defining the internal space. The laminate, A plurality of battery cells arranged in a first direction, An intermediate plate in the middle of the plurality of battery cells, Each including a restraining member that restrains the plurality of battery cells and the intermediate plate along the first direction. The intermediate plate arranged in a second direction orthogonal to the first direction engages with the side wall, and the intermediate plate continuously crosses the internal space along the second direction. The battery pack.

7. The battery pack according to claim 1 or claim 5, wherein the first laminate and the second laminate are formed to be elastically deformable along the first direction.

8. The battery pack according to claim 2 or claim 6, wherein the laminate is formed to be elastically deformable along the first direction.

9. A method for manufacturing the battery pack according to claim 1 or claim 5, comprising: a step of preparing a plate member having heat dissipation properties; a step of preparing the first laminate and the second laminate; a step of providing the first laminate and the second laminate on the plate member so that the first laminate and the second laminate are arranged in the second direction; a step of attaching the side wall to the plate member so as to sandwich the first laminate and the second laminate along the first direction and the second direction; a step of closing the internal space by providing a lid member.

10. A method for manufacturing the battery pack according to claim 2 or claim 6, comprising: a step of preparing a plate member having heat dissipation properties; a step of preparing the laminate; a step of providing the laminate on the plate member; a step of attaching the side wall to the plate member so as to sandwich the laminate along the first direction and the second direction; a step of closing the internal space by providing a lid member.

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