Battery pack

Abstract

To effectively use a space in a battery pack adopting Cell-to-Pack structure.SOLUTION: A first laminate 10A includes a plurality of first battery cells arranged in first direction. A plate-like first electroconductive members 400 electrically connects the first laminate 10A and a second laminate 10B. A plate-like second electroconductive member 410 electrically connects a third laminate 10C with an electrical appliance 50. A case 20 includes a pair of side walls 21 that supports the first laminate 10A, the second laminate 10B, and the third laminate 10C from both sides in a first direction. In a second direction orthogonal to the first direction, the electrical appliance 50, the first laminate 10A, the second laminate 10B, and the third laminate 10C are arranged in this order. In a third direction orthogonal to the first direction and to the second direction, the first electroconductive members 400 and the second electroconductive member 410 are overlapped each other.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present technology relates to battery packs. [Background technology]

[0002] International Publication No. 2021 / 123714 (Patent Document 1) is a prior art document that discloses the configuration of a battery pack. The battery pack described in Patent Document 1 discloses a configuration in which multiple bus bars that connect multiple battery modules are arranged on the same plane on multiple battery modules. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 123714 Summary of the Invention [Problem to be solved by the invention]

[0004] Battery packs are beginning to adopt a cell-to-pack structure in which a stack containing multiple battery cells is housed directly in a case without using end plates and bind bars (module structure) to restrain the multiple battery cells. If the bus bar configuration of the battery pack described in Patent Document 1 is applied to a battery pack that employs a cell-to-pack structure, there is room to effectively utilize the space within the battery pack in order to improve energy density.

[0005] The present technology has been made to solve the above-mentioned problems, and aims to provide a battery pack that can effectively utilize the space within the battery pack that employs a cell-to-pack structure. [Means for solving the problem]

[0006] The present technology provides the following battery pack. [1] a first stack including a plurality of first battery cells arranged in a first direction; a second stack including a plurality of second battery cells aligned in the first direction; a third stack including a plurality of third battery cells aligned in the first direction; an electric device electrically connected to the first stack, the second stack, and the third stack; a case that accommodates the first stack, the second stack, the third stack, and the electrical device; a plate-shaped first conductive member that electrically connects the first laminate and the second laminate; a plate-shaped second conductive member that electrically connects the third laminate and the electrical device; the case includes a pair of side walls that support the first stack, the second stack, and the third stack from both sides in the first direction; the electrical device, the first stack, the second stack, and the third stack are arranged in this order in a second direction perpendicular to the first direction; The battery pack, wherein the first conductive member and the second conductive member overlap in a third direction perpendicular to the first direction and the second direction. [2] further comprising a bus bar module disposed on the first stack, the second stack, and the third stack; the bus bar module includes a fastening member that fixes the first conductive member to the first laminate and the second laminate, and a cover member having a cover portion that covers at least a portion of the first conductive member and the fastening member, The battery pack according to [1], wherein the second conductive member and the cover portion overlap in the third direction. [3] the cover portion has a gap with respect to at least a portion of the first conductive member and the fastening member, The battery pack according to [2], wherein the cover portion is movable in the third direction by the distance of the gap and is capable of contacting the second conductive member. [4] The battery pack according to [2] or [3], wherein the cover member has a fixing portion capable of fixing the first conductive member and the second conductive member on the bus bar module. [5] a control board disposed on at least the first stack of the first stack, the second stack, and the third stack in the third direction; a board cover that covers the control board from the third direction, The battery pack according to any one of [1] to [4], wherein the board cover portion supports the second conductive member. [6] The battery pack according to any one of [1] to [5], wherein each of the first conductive member and the second conductive member extends in the second direction. [Effects of the Invention]

[0007] This technology makes it possible to effectively utilize the space inside a battery pack that employs a cell-to-pack structure. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a configuration of a battery pack according to a first embodiment of the present technology; [Figure 2] 1 is a perspective view showing an internal structure of a battery pack according to a first embodiment of the present technology; [Figure 3] 1 is a perspective view showing a configuration of a battery cell according to a first embodiment of the present technology. [Figure 4] FIG. 3 is a perspective view showing the positional relationship between a first conductive member and a second conductive member. [Figure 5] FIG. 2 is a perspective view showing the configuration of a cover portion included in the bus bar module. [Figure 6] 6 is a cross-sectional view of the structure around the cover portion of FIG. 5, as viewed from the direction of the arrows along line VI-VI. [Figure 7] FIG. 10 is a perspective view showing a state in which the conductive member is fixed to a fixing portion provided on the bus bar module. [Figure 8]1 is a perspective view showing a configuration of a substrate member included in a battery pack according to a first embodiment of the present technology. [Figure 9] 9 is a cross-sectional view of the configuration in the vicinity of the substrate member of FIG. 8, as viewed in the direction of the arrows along line IX-IX. [Figure 10] 10 is a perspective view showing a configuration of a conductive member included in a battery pack according to a second embodiment of the present technology. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present technology will be described. Note that the same or corresponding parts are denoted by the same reference characters, and description thereof may not be repeated.

[0010] In the embodiments described below, when numbers, amounts, etc. are mentioned, the scope of the present technology is not necessarily limited to those numbers, amounts, etc., unless otherwise specified. Furthermore, in the following embodiments, each component is not necessarily essential to the present technology, unless otherwise specified. Furthermore, the present technology is not necessarily limited to those that achieve all of the effects and advantages mentioned in the present embodiments.

[0011] In this specification, the terms "comprise," "include," and "have" are open-ended. That is, when a certain feature is included, other features may or may not be included.

[0012] Furthermore, when geometric terms and terms expressing positional and directional relationships are used in this specification, such as "parallel," "orthogonal," "45° diagonal," "coaxial," and "along," these terms allow for manufacturing errors and slight variations. When terms expressing relative positional relationships, such as "upper side" and "lower side," are used in this specification, these terms are used to indicate relative positional relationships in a single state, and the relative positional relationships can be reversed or rotated to any angle depending on the installation direction of each mechanism (for example, by turning the entire mechanism upside down).

[0013] In this specification, the term "battery" is not limited to lithium-ion batteries, but may include other batteries such as nickel-metal hydride batteries and sodium-ion batteries. In this specification, the term "electrode" may collectively refer to a positive electrode and a negative electrode.

[0014] Furthermore, the "battery pack" in this specification can be mounted in hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), etc. However, the use of the "battery pack" in this specification is not limited to vehicle use.

[0015] In the drawings, the direction in which the multiple laminates and electrical devices are arranged is the X direction as a second direction, the direction in which the multiple battery cells are arranged is the Y direction as a first direction, and the direction in which the first conductive member and the second conductive member are arranged is the Z direction as a third direction. Also, to facilitate understanding of the present technology, the dimensional ratios of each component in the drawings may be changed from the actual dimensional ratios.

[0016] (Embodiment 1) Fig. 1 is a perspective view showing a configuration of a battery pack according to embodiment 1 of the present technology. Fig. 2 is a perspective view showing an internal structure of the battery pack according to embodiment 1 of the present technology. Note that a substrate member 60, which will be described later, is omitted from Figs. 1 and 2.

[0017] As shown in FIGS. 1 and 2, a battery pack 1 in this embodiment includes a laminate 10, a case 20, a bus bar module 30, a conductive member 40, and an electric device 50.

[0018] The laminate 10 includes a first laminate 10A, a second laminate 10B, and a third laminate 10C. The first laminate 10A includes a plurality of first battery cells arranged in a first direction (Y direction). The second laminate 10B includes a plurality of second battery cells arranged in the first direction (Y direction). The third laminate 10C includes a plurality of third battery cells arranged in the first direction (Y direction). Details of the first, second, and third battery cells that make up the battery cells 100 (see FIG. 3) will be described later.

[0019] The case 20 accommodates the first laminate 10A, the second laminate 10B, the third laminate 10C, and the electric device 50.

[0020] The case 20 includes a pair of side walls 21. The pair of side walls 21 includes one side wall 22 and the other side wall 23.

[0021] The pair of side walls 21 support the first stack 10A, the second stack 10B, and the third stack 10C from both sides in the first direction (Y direction). In the present embodiment, one side wall 22 and the other side wall 23 directly support the first stack 10A, the second stack 10B, and the third stack 10C from both sides in the Y direction. In this way, the battery pack 1 according to the present embodiment employs a cell-to-pack structure in which the stack 10 including a plurality of battery cells is housed directly in the case 20.

[0022] The bus bar module 30 is disposed on the laminate 10. The bus bar module 30 insulates the laminate 10 from other components disposed on the laminate 10. The bus bar module 30 electrically connects the multiple battery cells in the laminate 10 together via inter-cell bus bars (not shown).

[0023] The busbar module 30 includes a first busbar module 30A arranged on the first laminate 10A, a second busbar module 30B arranged on the second laminate 10B, and a third busbar module 30C arranged on the third laminate 10C.

[0024] The conductive members 40 are provided to electrically connect the laminates to each other, and to electrically connect the laminate 10 to the electrical device 50. The conductive members 40 are made of, for example, copper.

[0025] The conductive member 40 includes a plate-shaped first conductive member 400, a plate-shaped second conductive member 410, a plate-shaped third conductive member 420, and a plate-shaped fourth conductive member 430.

[0026] The first conductive member 400 and the second conductive member 410 are disposed adjacent to one side wall 22 of the pair of side walls 21. The first conductive member 400 extends in the second direction (X direction). The second conductive member 410 extends along the second direction (X direction) while bending.

[0027] The first conductive member 400 electrically connects the first laminate 10A and the second laminate 10B. The second conductive member 410 electrically connects the third laminate 10C and the electric device 50.

[0028] The third conductive member 420 and the fourth conductive member 430 are disposed adjacent to the other side wall 23 of the pair of side walls 21. The third conductive member 420 extends in the X direction while bending. The fourth conductive member 430 extends in the X direction.

[0029] The third conductive member 420 electrically connects the first laminate 10A to the electric device 50. The fourth conductive member 430 electrically connects the second laminate 10B to the third laminate 10C.

[0030] The electrical device 50 is, for example, a junction box for electrically connecting the stack 10 and an external device of the battery pack 1. The electrical device 50 is electrically connected to the first stack 10A, the second stack 10B, and the third stack 10C. Note that the electrical device 50 is not limited to a junction box, and may be a fourth stack in which multiple battery cells are arranged in the Y direction, or a terminal or terminal box for connecting the battery pack 1 and an external device.

[0031] In a second direction (X direction) perpendicular to the first direction (Y direction), the electric device 50, the first laminate 10A, the second laminate 10B, and the third laminate 10C are arranged in this order.

[0032] In the battery pack 1 of this embodiment, current flows through the electrical device 50, the third conductive member 420, the first laminate 10A, the first conductive member 400, the second laminate 10B, the fourth conductive member 430, the third laminate 10C, the second conductive member 410, and the electrical device 50 in that order.

[0033] 3 is a perspective view showing a configuration of a battery cell according to embodiment 1 of the present technology. As shown in FIG. 3, a battery cell 100 according to the present embodiment includes an electrode terminal 110, a housing 120, and a gas release valve 130.

[0034] The electrode terminal 110 is formed on the housing 120. The electrode terminal 110 has a positive electrode terminal 111 and a negative electrode terminal 112. The positive electrode terminal 111 and the negative electrode terminal 112 are arranged side by side in the X direction.

[0035] The housing 120 is a container that houses an electrode assembly and an electrolyte (not shown). The housing 120 has a substantially rectangular parallelepiped shape. The housing 120 is made of aluminum, an aluminum alloy, iron, or an iron alloy such as stainless steel.

[0036] The housing 120 has a sealing plate 121, a bottom surface 122, a pair of long side walls 123, and a pair of short side walls .

[0037] The sealing plate 121 forms the upper surface of the housing 120. The electrode terminals 110 are arranged on the sealing plate 121. The bottom surface 122 faces the sealing plate 121 in the Z direction.

[0038] The pair of long side walls 123 and the pair of short side walls 124 form the side surfaces of the housing 120. The pair of long side walls 123 and the pair of short side walls 124 intersect with the sealing plate 121 and the bottom surface 122, respectively. The pair of long side walls 123 face each other in the Y direction with the electrode body therebetween. The pair of short side walls 124 face each other in the X direction with the electrode body therebetween. Each of the pair of long side walls 123 has a larger area than each of the pair of short side walls 124.

[0039] The gas exhaust valve 130 breaks when the pressure inside the housing 120 reaches or exceeds a predetermined value, thereby allowing the gas inside the housing 120 to be exhausted to the outside of the housing 120.

[0040] 4 is a perspective view showing the positional relationship between the first conductive member and the second conductive member. As shown in FIG. 4, the second conductive member 410 has a first bent portion 411 and a second bent portion 412.

[0041] The first bent portion 411 is located on the third laminate 10C side in the X direction from the center of the second conductive member 410. The second bent portion 412 is located on the electric device 50 side in the X direction from the center of the second conductive member 410.

[0042] The second conductive member 410 is bent upward in the Z direction at a first bent portion 411 from the third laminate 10C toward the electric device 50. The second conductive member 410 is bent downward in the Z direction at a second bent portion 412 from the third laminate 10C toward the electric device 50.

[0043] The first conductive member 400 is disposed between the first bent portion 411 and the second bent portion 412 of the second conductive member 410 in the X direction. As a result, the first conductive member 400 and the second conductive member 410 overlap in a third direction (Z direction) that is perpendicular to the first direction (Y direction) and the second direction (X direction). In the present embodiment, the first conductive member 400 is disposed below the second conductive member 410 in the Z direction.

[0044] The second conductive member 410 has a three-dimensional shape due to the first bent portion 411 and the second bent portion 412. A step may be formed in the Z direction due to differences in the Z-direction between the top surface of the second busbar module 30B and the top surface of the electric device 50 and the top surface of the second busbar module 30B and the third busbar module 30C. In this case, the second conductive member 410 can easily accommodate the step by arbitrarily changing the bending angles of the first bent portion 411 and the second bent portion 412.

[0045] The second conductive member 410 is formed by punching, for example, press working. If the first conductive member and the second conductive member are arranged on the same plane on the laminate 10, the second conductive member will be configured to extend in multiple directions on the XY plane. When forming this second conductive member, material other than the portion that will become the second conductive member will be discarded. On the other hand, the second conductive member 410 in this embodiment is composed of a linear material that extends in the X direction when viewed from the Z direction. Therefore, when forming the second conductive member 410, less material will be discarded. As a result, the yield when forming the second conductive member 410 is improved.

[0046] Fig. 5 is a perspective view showing the configuration of a cover part provided in the bus bar module, and Fig. 6 is a cross-sectional view of the structure around the cover part of Fig. 5 as seen from the direction of the arrows along line VI-VI.

[0047] As shown in FIGS. 4 to 6, the bus bar module 30 includes a plate member 300, a cover member 310, and a fastening member 330.

[0048] The plate member 300 is an insulating plate-shaped member that is provided on the battery cells 100. On the plate member 300, fastening members 330, inter-cell bus bars, and the like are arranged.

[0049] Cover member 310 covers fastening members 330, inter-cell bus bars, etc. Cover member 310 has a main body portion 311, a cover portion 320, and a holding mechanism. Main body portion 311 is a portion that mainly covers inter-cell bus bars, etc.

[0050] Cover portion 320 covers at least a portion of first conductive member 400 and fastening member 330. Cover portion 320 is disposed inside opening 312 provided in main body portion 311.

[0051] The cover part 320 has a recess 321, an operating part 322, and a hinge part (not shown). The first conductive member 400 is inserted into the recess 321. The operating part 322 is provided on the side of the cover part 320 opposite to the side on which one side wall 22 is arranged in the Y direction. The operating part 322 enables the cover part 320 to be opened and closed relative to the main body part 311. The hinge part is located on the side opposite to the side on which the first conductive member 400 is arranged with respect to the fastening member 330 in the X direction. The hinge part rotates the cover part 320 around an axis in a first direction (direction DR1 in FIG. 5) when opening or closing the cover part 320.

[0052] The holding mechanism holds the cover portion 320 in an open state relative to the main body portion 311. The holding mechanism has an extension portion 323 and a claw portion 314. The extension portion 323 is arranged on the cover portion 320. The extension portion 323 extends in one direction and is elastically deformable. The claw portion 314 is arranged on the main body portion 311. The extension portion 323 is engageable with the claw portion 314. The extension portion 323 is elastically deformed to engage with the extension portion 323 and the claw portion 314, thereby holding the cover portion 320 in an open state relative to the main body portion 311.

[0053] The fastening member 330 fixes the first conductive member 400 to the first stack 10A and the second stack 10B. The fastening member 330 in this embodiment has a bolt member 331 and a nut member 332. The bolt member 331 is inserted into a hole 401 of the first conductive member 400. With the first conductive member 400 disposed between the bolt member 331 and the nut member 332, the bolt member 331 is screwed into the nut member 332.

[0054] 4, the second conductive member 410 and the cover portion 320 overlap in the third direction (Z direction). The cover portion 320 is located between the fastening member 330 and the second conductive member 410, and therefore, interference between the fastening member 330 and the second conductive member 410 can be prevented.

[0055] 5 and 6, the cover portion 320 has a gap G with respect to at least a portion of the first conductive member 400 and the fastening member 330. This allows the cover portion 320 to move in the third direction (Z direction) by the amount of the gap G. The cover portion 320 can come into contact with the second conductive member 410.

[0056] Fig. 7 is a perspective view showing a state in which the conductive members are fixed to fixing portions provided on the bus bar module, illustrating a state in which the first conductive member 400 of the conductive member 40 is fixed.

[0057] 7, the cover member 310 has a fixing portion 315. The fixing portion 315 is capable of fixing the first conductive member 400 onto the second bus bar module 30B.

[0058] Specifically, the fixing portion 315 has a configuration in which a pair of hooks face each other. The first conductive member 400 is inserted between the pair of hooks. The tips of the pair of hooks elastically deform, widening the gap between the pair of hooks. After the first conductive member 400 is inserted, the elastic deformation of the pair of hooks returns to its original state. The tips of the pair of hooks come into contact with the upper surface of the first conductive member 400. As a result, the first conductive member 400 is fixed to the fixing portion 315.

[0059] In the present embodiment, guide members 316 are provided on both sides of fixed portion 315 in the X direction. Guide members 316 fix first conductive member 400 in a direction perpendicular to the direction in which first conductive member 400 extends. Fixed portion 315 positions first conductive member 400 in the Z direction, and guide members 316 positions first conductive member 400 in the Y direction.

[0060] Conductive members 40 other than the first conductive member 400, including the second conductive member 410, can also be fixed on the bus bar module 30 by the fixing portion 315. Note that the fixing portion 315 may be configured to position the conductive member 40 in both the Z direction and the Y direction.

[0061] Fig. 8 is a perspective view showing the configuration of a board member included in the battery pack according to embodiment 1 of the present technology. Fig. 9 is a cross-sectional view of the configuration in the vicinity of the board member of Fig. 8, as seen from the direction of the arrows along line IX-IX.

[0062] 8 and 9, the battery pack 1 according to this embodiment further includes a board member 60. The board member 60 detects the temperature of each of the plurality of battery cells 100 and controls the current value, etc. The board member 60 includes a control board 600 and a board cover part 610.

[0063] The control board 600 is disposed in the third direction (Z direction) on at least the first stack 10A out of the first stack 10A, the second stack 10B, and the third stack 10C. In the present embodiment, the control board 600 is disposed only on the first stack 10A in the Z direction via the first bus bar module 30A.

[0064] The board cover portion 610 has insulating properties. The board cover portion 610 covers the control board 600 from the third direction (Z direction). The board cover portion 610 has an extending surface portion 611 and a folded portion 612.

[0065] The extending surface portion 611 is a portion that extends from an end portion of the upper surface of the board cover portion 610 on one side wall 22 side in the Y direction so as to cover the second conductive member 410. The folded portion 612 is a portion that is folded back at the end portion of the extending surface portion 611 in the Y direction so as to be positioned on the lower surface side of the second conductive member 410 in the Z direction.

[0066] The second conductive member 410 is supported by the extending surface portion 611 and the folded portion 612. In this way, the board cover portion 610 supports the second conductive member 410. The insulating board cover portion 610 can suppress vibration of the second conductive member 410 while ensuring insulation.

[0067] In the battery pack 1 according to the first embodiment of the present technology, the first conductive member 400 and the second conductive member 410 overlap in the third direction (Z direction), which reduces the area occupied by the conductive member 40 above the laminate 10 when viewed from the Z direction, compared to when the first conductive member and the second conductive member are arranged on the same plane on the laminate 10. As a result, space can be secured above the laminate 10 for arranging components other than the conductive member 40, allowing the space within the battery pack 1 to be used effectively.

[0068] In the battery pack 1 according to embodiment 1 of the present technology, the cover portion 320 is disposed between the first conductive member 400 and the second conductive member 410, thereby preventing interference between the first conductive member 400 and the second conductive member 410.

[0069] In the battery pack 1 according to embodiment 1 of the present technology, the cover portion 320 has a gap G with respect to the first conductive member 400 and the fastening member 330, which allows the cover portion 320 to move up and down in the Z direction. Therefore, when the second conductive member 410 vibrates, the cover portion 320 can come into contact with the cover portion 320, thereby absorbing the vibration of the second conductive member 410.

[0070] In the battery pack 1 according to the first embodiment of the present technology, by fixing the conductive member 40 by the fixing portion 315 of the cover member 310, it is possible to make the structure resistant to vibration when the first conductive member 400 and the second conductive member 410 are stacked in the Z direction.

[0071] In the battery pack 1 according to the first embodiment of the present technology, the second conductive member 410 is supported by the substrate cover portion 610 of the substrate member 60, so that the first conductive member 400 and the second conductive member 410 are configured to overlap in the Z direction, and even if the second conductive member 410 vibrates, the vibration of the second conductive member 410 can be suppressed.

[0072] In the battery pack 1 according to the first embodiment of the present technology, by providing each of the first conductive member 400 and the second conductive member 410 to extend in the second direction (X direction), it is possible to effectively utilize the upper space within the battery pack 1 while shortening the length of each of the first conductive member 400 and the second conductive member 410, compared to when each of the first conductive member 400 and the second conductive member 410 is arranged at an angle from the X direction.

[0073] (Embodiment 2) The following describes a battery pack according to embodiment 2. The battery pack according to embodiment 2 has a different connection structure between the first conductive member and the laminate than battery pack 1 according to embodiment 1 of the present technology, and therefore, the description of the configuration that is the same as battery pack 1 according to embodiment 1 of the present technology will not be repeated.

[0074] FIG. 10 is a perspective view showing a configuration of a conductive member included in a battery pack according to a second embodiment of the present technology.

[0075] As shown in FIG. 10, a first conductive member 400A according to this embodiment is connected to the laminate 10 by welding.

[0076] Specifically, a through-hole (not shown) is provided in the first conductive member 400A. A laser is irradiated into this through-hole to form a joint 402. This joins the electrode terminal of the battery cell in the stack to the first conductive member 400A.

[0077] In the battery pack 1 according to the second embodiment of the present technology, the first conductive member 400A and the second conductive member 410 also overlap in the third direction (Z direction), which reduces the area occupied by the conductive members above the laminate 10 when viewed from the Z direction, compared to when the first conductive member and the second conductive member are arranged on the same plane on the laminate 10. As a result, space can be secured above the laminate 10 for arranging components other than the conductive members, allowing for effective use of the space within the battery pack.

[0078] Although the embodiments of the present technology have been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present technology is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0079] REFERENCE SIGNS LIST 1 battery pack, 10 laminate, 10A first laminate, 10B second laminate, 10C third laminate, 20 case, 21 pair of side walls, 22 one side wall, 23 other side wall, 30 bus bar module, 30A first bus bar module, 30B second bus bar module, 30C third bus bar module, 40 conductive member, 50 electrical equipment, 60 substrate member, 100 battery cell, 110 electrode terminal, 111 positive electrode terminal, 112 negative electrode terminal, 120 housing, 121 sealing plate, 122 bottom surface, 123 pair of long side walls, 124 pair of short side walls, 130 gas release valve, 300 plate member, 310 cover member, 311 main body portion, 312 opening, 314 claw portion, 315 fixing portion, 316 guide member, 320 Cover portion, 321 recess, 322 operating portion, 323 extension portion, 330 fastening member, 331 bolt member, 332 nut member, 400, 400A first conductive member, 401 hole, 402 joint portion, 410 second conductive member, 411 first bent portion, 412 second bent portion, 420 third conductive member, 430 fourth conductive member, 600 control board, 610 board cover portion, 611 extension surface portion, 612 folded portion, G gap.

Claims

1. a first stack including a plurality of first battery cells arranged in a first direction; a second stack including a plurality of second battery cells aligned in the first direction; a third stack including a plurality of third battery cells aligned in the first direction; an electric device electrically connected to the first stack, the second stack, and the third stack; a case that accommodates the first stack, the second stack, the third stack, and the electrical device; a plate-shaped first conductive member that electrically connects the first stack and the second stack; a plate-shaped second conductive member that electrically connects the third laminate and the electrical device, the case includes a pair of side walls that support the first stack, the second stack, and the third stack from both sides in the first direction, the electrical device, the first stack, the second stack, and the third stack are arranged in this order in a second direction perpendicular to the first direction; The battery pack, wherein the first conductive member and the second conductive member overlap in a third direction perpendicular to the first direction and the second direction.

2. further comprising a bus bar module disposed on the first stack, the second stack, and the third stack; the bus bar module includes a fastening member that fixes the first conductive member to the first laminate and the second laminate, and a cover member having a cover portion that covers at least a portion of the first conductive member and the fastening member, The battery pack according to claim 1 , wherein the second conductive member and the cover portion overlap in the third direction.

3. the cover portion has a gap with respect to at least a portion of the first conductive member and the fastening member, The battery pack according to claim 2 , wherein the cover portion is movable in the third direction by an amount equal to the gap and is capable of coming into contact with the second conductive member.

4. The battery pack according to claim 2 or 3, wherein the cover member has a fixing portion that can fix the first conductive member and the second conductive member on the bus bar module.

5. a control board disposed on at least the first stack of the first stack, the second stack, and the third stack in the third direction; a board cover that covers the control board from the third direction, The battery pack according to claim 1 , wherein the board cover supports the second conductive member.

6. 3. The battery pack according to claim 1, wherein each of the first conductive member and the second conductive member extends in the second direction.

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