Battery pack

Abstract

The invention provides a battery pack capable of effectively utilizing the space in the battery pack adopting a battery-to-battery pack structure. The first stacked body includes a plurality of first battery cells arranged in a first direction. A plate-shaped first conductive member electrically connects the first laminate and the second laminate. The plate-shaped second conductive member electrically connects the third laminate and the electrical device. The case includes a pair of side walls that support the first, second, and third laminated bodies from both sides in the first direction. The electrical device, the first laminate, the second laminate, and the third laminate are arranged in this order in a second direction orthogonal to the first direction. The first conductive member and the second conductive member overlap in a third direction orthogonal to the first direction and the second direction.

Description

Technical Field

[0001] The present technology relates to a battery pack. Background Art

[0002] As a prior art document that discloses the structure of a battery pack, there is International Publication No. 2021 / 123714. In the battery pack described in International Publication No. 2021 / 123714, a structure is disclosed in which a plurality of bus bars that connect battery modules to each other are arranged on the same plane on a plurality of battery modules.

[0003] In the battery pack, instead of using end plates and connecting rods (module structure) that constrain multiple battery cells, a cell-to-pack structure is being adopted in which a stack of multiple battery cells is directly housed in a housing. When the structure of the bus bar of the battery pack described in International Publication No. 2021 / 123714 is applied to a battery pack adopting a cell-to-pack structure, there is room for effectively utilizing the space in the battery pack in order to increase the energy density. Summary of the invention

[0004] The present technology has been made to solve the above-mentioned problems, and an object of the present technology is to provide a battery pack capable of effectively utilizing the space inside a battery pack that adopts a battery-to-battery pack structure.

[0005] This technology provides the following battery packs. [1]

[0007] A battery pack, comprising:

[0008] a first stack including a plurality of first battery cells arranged in a first direction;

[0009] a second stack including a plurality of second battery cells arranged in the first direction;

[0010] a third stack including a plurality of third battery cells arranged in the first direction;

[0011] an electrical device electrically connected to the first stack, the second stack, and the third stack;

[0012] a housing that accommodates the first stack, the second stack, the third stack, and the electrical device;

[0013] a plate-shaped first conductive member electrically connecting the first stacked body and the second stacked body; and

[0014] a plate-shaped second conductive member, the second conductive member electrically connecting the third stacked body and the electrical device,

[0015] The housing includes a pair of side walls supporting the first stack, the second stack, and the third stack from both sides in the first direction.

[0016] In a second direction orthogonal to the first direction, the electrical device, the first stack, the second stack, and the third stack are arranged in sequence.

[0017] The first conductive member overlaps with the second conductive member in a third direction that is orthogonal to the first direction and the second direction. [2]

[0019] The battery pack according to [1] further comprises a bus bar module, wherein the bus bar module is arranged on the first stack, the second stack, and the third stack.

[0020] The bus bar module includes: a fastening member that fixes the first conductive member to the first stack and the second stack; and a cover member that includes a cover portion that covers at least a portion of the first conductive member and the fastening member.

[0021] In the third direction, the second conductive member overlaps with the cover portion. [3]

[0023] According to the battery pack described in [2], the cover portion has a gap with respect to at least a portion of the first conductive member and the fastening member.

[0024] The cover portion is movable in the third direction by an amount corresponding to the gap and is capable of coming into contact with the second conductive member. [4]

[0026] In the battery pack described in [2] or [3], the cover member has a fixing portion capable of fixing the first conductive member and the second conductive member to the bus bar module. [5]

[0028] The battery pack according to any one of [1] to [4], further comprising:

[0029] a control substrate, the control substrate being arranged on at least the first stack among the first stack, the second stack, and the third stack in the third direction; and

[0030] a substrate cover portion, the substrate cover portion covering the control substrate from the third direction,

[0031] The substrate cover portion supports the second conductive member. [6]

[0033] According to the battery pack described in any one of [1] to [5], the first conductive member and the second conductive member each extend along the second direction.

[0034] The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a perspective view showing the structure of the battery pack according to the first embodiment of the present technology.

[0036] Figure 2 This is a perspective view showing the internal structure of the battery pack according to the first embodiment of the present technology.

[0037] Figure 3 This is a perspective view showing the structure of the battery cell according to the first embodiment of the present technology.

[0038] Figure 4 It is a perspective view showing the positional relationship between the first conductive member and the second conductive member.

[0039] Figure 5 It is a perspective view showing the structure of a cover portion included in the bus bar module.

[0040] Figure 6 Observe from the direction of the arrow on line VI-VI Figure 5 A cross-sectional view of the structure around the hood.

[0041] Figure 7 It is a perspective view showing a state in which a conductive member is fixed to a fixing portion provided in a bus bar module.

[0042] Figure 8 This is a perspective view showing the structure of a substrate member included in the battery pack according to the first embodiment of the present technology.

[0043] Fig. 9 Observe from the direction of the arrow on line IX-IX Figure 8 A cross-sectional view of a structure near a substrate member.

[0044] Fig.10 This is a perspective view showing the structure of a conductive member included in a battery pack according to a second embodiment of the present technology. DETAILED DESCRIPTION

[0045] Hereinafter, embodiments of the present technology will be described. It should be noted that the same reference numerals may be given to the same or corresponding parts, and description thereof may not be repeated.

[0046] It should be noted that, in the embodiments described below, when the number, amount, etc. are mentioned, except for the cases specifically described, the scope of the present technology is not necessarily limited to the number, amount, etc. In addition, in the following embodiments, except for the cases specifically described, each component is not necessarily essential to the present technology. In addition, the present technology is not necessarily limited to achieving all the effects mentioned in the present embodiment.

[0047] It should be noted that in this specification, the descriptions of “comprise”, “include”, and “have” are open-ended. That is, when a certain structure is included, other structures other than the structure may or may not be included.

[0048] In addition, in this specification, when geometrical terms and terms indicating position / direction relationships, such as "parallel", "orthogonal", "inclined at 45°", "coaxial", "along", etc., are used, these terms allow for manufacturing errors or slight variations. In this specification, when terms such as "upper side" and "lower side" are used to indicate relative positional relationships, these terms are used as terms indicating relative positional relationships in one state, and the relative positional relationships can be reversed or rotated to any angle depending on the installation direction of each mechanism (for example, turning the entire mechanism upside down, etc.).

[0049] In this specification, "battery" is not limited to lithium-ion batteries, and may include other batteries such as nickel-hydrogen batteries and sodium-ion batteries. In this specification, "electrode" may be collectively referred to as positive electrode and negative electrode.

[0050] In addition, the "battery pack" in this specification can be installed in a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), an electric vehicle (BEV), etc. However, the use of the "battery pack" in this specification is not limited to vehicle-mounted use.

[0051] It should be noted that in the drawings, the direction in which the plurality of stacked bodies and the electrical devices are arranged is set as the X direction as the second direction, the direction in which the plurality of battery cells are arranged is set as the Y direction as the first direction, and the direction in which the first conductive member and the second conductive member are arranged is set as the Z direction as the third direction. In addition, in order to facilitate understanding of the present technology, there are portions in which the dimensional ratios of the various structures in the drawings are changed from the actual dimensional ratios.

[0052] (Implementation method 1)

[0053] Figure 1 This is a perspective view showing the structure of the battery pack according to the first embodiment of the present technology. Figure 2 is a perspective view showing the internal structure of the battery pack according to the first embodiment of the present technology. Figure 1 and Figure 2 In the figure, a substrate member 60 described later is omitted.

[0054] like Figure 1 and Figure 2 As shown, the battery pack 1 of the present embodiment includes a stacked body 10 , a case 20 , a bus bar module 30 , a conductive member 40 , and an electric device 50 .

[0055] The stack 10 includes a first stack 10A, a second stack 10B, and a third stack 10C. The first stack 10A includes a plurality of first battery cells arranged in a first direction (Y direction). The second stack 10B includes a plurality of second battery cells arranged in a first direction (Y direction). The third stack 10C includes a plurality of third battery cells arranged in a first direction (Y direction). Figure 3 )'s first battery cell, the second battery cell, and the third battery cell will be described in detail later.

[0056] The housing 20 accommodates the first stack 10A, the second stack 10B, the third stack 10C, and the electric device 50 .

[0057] The housing 20 includes a pair of side walls 21. The pair of side walls 21 includes a side wall 22 on one side and a side wall 23 on the other side.

[0058] The pair of side walls 21 supports 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, the side wall 22 on one side and the side wall 23 on the other side 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 of the present embodiment adopts a battery-to-battery pack structure in which the stack 10 including a plurality of battery cells is directly accommodated in the housing 20.

[0059] The bus bar module 30 is disposed on the stacked body 10. The bus bar module 30 insulates the stacked body 10 from other components disposed on the stacked body 10. The bus bar module 30 electrically connects a plurality of battery cells in the stacked body 10 to each other via inter-cell bus bars (not shown).

[0060] The bus bar module 30 includes a first bus bar module 30A arranged on the first stack 10A, a second bus bar module 30B arranged on the second stack 10B, and a third bus bar module 30C arranged on the third stack 10C.

[0061] The conductive member 40 is provided to electrically connect the laminated bodies to each other and the laminated body 10 and the electric device 50. The conductive member 40 is made of copper, for example.

[0062] 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 .

[0063] The first conductive member 400 and the second conductive member 410 are disposed close 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 in the second direction (X direction) while being bent.

[0064] The first conductive member 400 electrically connects the first stack 10A and the second stack 10B. The second conductive member 410 electrically connects the third stack 10C and the electric device 50.

[0065] The third conductive member 420 and the fourth conductive member 430 are disposed close to the other side wall 23 of the pair of side walls 21. The third conductive member 420 extends along the X direction while being bent. The fourth conductive member 430 extends along the X direction.

[0066] The third conductive member 420 electrically connects the first stack 10A and the electric device 50. The fourth conductive member 430 electrically connects the second stack 10B and the third stack 10C.

[0067] The electrical device 50 is, for example, a junction box for electrically connecting the stack 10 to 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. In addition, the electrical device 50 is not limited to a junction box, and may be a fourth stack in which a plurality of battery cells are arranged in the Y direction, or may be a terminal or a terminal box for connecting the battery pack 1 to an external device.

[0068] In the second direction (X direction) orthogonal to the first direction (Y direction), the electric device 50 , the first stack 10A, the second stack 10B, and the third stack 10C are arranged in this order.

[0069] In the battery pack 1 of the present embodiment, current flows in the order of the electric device 50 , the third conductive member 420 , the first stack 10A, the first conductive member 400 , the second stack 10B, the fourth conductive member 430 , the third stack 10C, the second conductive member 410 , and the electric device 50 .

[0070] Figure 3 1 is a perspective view showing the structure of a battery cell according to Embodiment 1 of the present technology. Figure 3 As shown, the battery cell 100 of the present embodiment includes an electrode terminal 110 , a frame 120 , and a gas exhaust valve 130 .

[0071] The electrode terminal 110 is formed on the frame body 120. The electrode terminal 110 includes 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.

[0072] The frame 120 is a container for accommodating an electrode assembly and an electrolyte solution (not shown). The frame 120 has a substantially rectangular parallelepiped shape. The frame 120 is made of aluminum, an aluminum alloy, iron, or an iron alloy such as stainless steel.

[0073] The frame body 120 includes a sealing plate 121 , a bottom surface 122 , a pair of long side walls 123 , and a pair of short side walls 124 .

[0074] The sealing plate 121 constitutes the upper surface of the frame body 120. The electrode terminal 110 is arranged on the sealing plate 121. The bottom surface 122 faces the sealing plate 121 in the Z direction.

[0075] A pair of long side walls 123 and a pair of short side walls 124 constitute the side surfaces of the frame body 120. The pair of long side walls 123 and the pair of short side walls 124 intersect the sealing plate 121 and the bottom surface 122, respectively. The pair of long side walls 123 each sandwich the electrode body in the Y direction and face each other. The pair of short side walls 124 each sandwich the electrode body in the X direction and face each other. The pair of long side walls 123 each have a larger area than each of the pair of short side walls 124.

[0076] The gas discharge valve 130 breaks when the pressure in the housing 120 reaches a predetermined value or more. As a result, the gas in the housing 120 is discharged to the outside of the housing 120 .

[0077] Figure 4 is a perspective view showing the positional relationship between the first conductive member and the second conductive member. Figure 4As shown, the second conductive member 410 has a first bent portion 411 and a second bent portion 412 .

[0078] The first bent portion 411 is located on the third stacked body 10C side from the center of the second conductive member 410 in the X direction. The second bent portion 412 is located on the electric device 50 side from the center of the second conductive member 410 in the X direction.

[0079] The second conductive member 410 is bent upward in the Z direction from the third stack 10C toward the electric device 50 at the first bent portion 411. The second conductive member 410 is bent downward in the Z direction from the third stack 10C toward the electric device 50 at the second bent portion 412.

[0080] The first conductive member 400 is disposed between the first curved portion 411 and the second curved portion 412 of the second conductive member 410 in the X direction. Thus, in the third direction (Z direction) orthogonal to the first direction (Y direction) and the second direction (X direction), the first conductive member 400 overlaps with the second conductive member 410. In the present embodiment, the first conductive member 400 is disposed below the second conductive member 410 in the Z direction.

[0081] The second conductive member 410 has a three-dimensional shape by having the first bent portion 411 and the second bent portion 412. Since the upper surfaces of the second bus bar module 30B and the third bus bar module 30C are located at different positions from the upper surface of the electric device 50 in the Z direction, a step may be formed in the Z direction. In this case, the second conductive member 410 can easily cope with the step by arbitrarily changing the bending angles of the first bent portion 411 and the second bent portion 412.

[0082] The second conductive member 410 is formed, for example, by punching such as stamping. Assuming that the first conductive member and the second conductive member are arranged on the same plane on the stack 10, the second conductive member becomes a structure extending in multiple directions on the XY plane. The material other than the part that becomes the second conductive member when the second conductive member is formed becomes waste. On the other hand, the second conductive member 410 in the present embodiment is composed of a straight line material extending in the X direction when viewed from the Z direction. Therefore, when the second conductive member 410 is formed, the part that becomes waste becomes less. As a result, the yield rate when the second conductive member 410 is formed is improved.

[0083] Figure 5 It is a perspective view showing the structure of a cover portion included in the bus bar module. Figure 6 Observe from the direction of the arrow on line VI-VI Figure 5 A cross-sectional view of the structure around the hood.

[0084] like Figure 4~Figure 6 As shown, the bus bar module 30 includes a plate member 300 , a cover member 310 , and a fastening member 330 .

[0085] The plate member 300 is a plate-shaped member having insulating properties and provided on the battery cell 100. The plate member 300 is provided with a fastening member 330, an inter-cell bus bar, and the like.

[0086] The cover member 310 covers the fastening member 330 and the inter-unit bus bar, etc. The cover member 310 includes a main body portion 311, a cover portion 320, and a holding mechanism. The main body portion 311 is a portion that mainly covers the inter-unit bus bar, etc.

[0087] The cover portion 320 covers at least a portion of the first conductive member 400 and the fastening member 330 . The cover portion 320 is disposed inside the opening portion 312 provided in the main body portion 311 .

[0088] The cover 320 has a recess 321, an operating portion 322, and a hinged portion (not shown). The first conductive member 400 is inserted into the recess 321. The operating portion 322 is provided on the side of the cover 320 opposite to the side on which one side wall 22 is provided in the Y direction. The cover 320 can be opened and closed relative to the main body 311 by the operating portion 322. The hinged portion is located on the side opposite to the side on which the first conductive member 400 is provided relative to the fastening member 330 in the X direction. The hinged portion allows the cover 320 to rotate around the axis ( Figure 5 DR1 direction) in the direction of rotation.

[0089] The holding mechanism holds the cover 320 in an open state relative to the main body 311. The holding mechanism includes an extension portion 323 and a claw portion 314. The extension portion 323 is disposed on the cover 320. The extension portion 323 extends in one direction and can be elastically deformed. The claw portion 314 is disposed on the main body 311. The claw portion 314 can engage with the extension portion 323. The extension portion 323 is elastically deformed and the extension portion 323 and the claw portion 314 are engaged, thereby being able to hold the cover 320 in an open state relative to the main body 311.

[0090] 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 includes a bolt member 331 and a nut member 332. The bolt member 331 is inserted into the hole 401 of the first conductive member 400. The bolt member 331 and the nut member 332 are screwed together in a state where the first conductive member 400 is arranged between the bolt member 331 and the nut member 332.

[0091] like Figure 4As shown, in the third direction (Z direction), the second conductive member 410 overlaps the cover portion 320. The cover portion 320 is located between the fastening member 330 and the second conductive member 410, so interference between the fastening member 330 and the second conductive member 410 can be prevented.

[0092] like Figure 5 and Figure 6 As shown, the cover 320 has a gap G with respect to at least a portion of the first conductive member 400 and the fastening member 330 . Thus, the cover 320 can move in the third direction (Z direction) by an amount corresponding to the gap G. The cover 320 can abut against the second conductive member 410 .

[0093] Figure 7 1 is a perspective view showing a state where a conductive member is fixed to a fixing portion provided in a bus bar module. Figure 7 , a state in which the first conductive member 400 among the conductive members 40 is fixed is illustrated.

[0094] like Figure 7 As shown, the cover member 310 has a fixing portion 315. The fixing portion 315 can fix the first conductive member 400 to the second bus bar module 30B.

[0095] Specifically, the fixing portion 315 has a structure in which a pair of hooks face each other. The first conductive member 400 is inserted between the pair of hooks. The top ends of the pair of hooks are elastically deformed, and the gap between the pair of hooks is expanded. After the first conductive member 400 is inserted, the elastic deformation of the pair of hooks is restored. The top ends of the pair of hooks are in contact with the upper surface portion of the first conductive member 400. Thus, the first conductive member 400 is fixed to the fixing portion 315.

[0096] In this embodiment, the guide members 316 are provided on both sides of the fixing portion 315 in the X direction. The guide members 316 fix the first conductive member 400 in a direction perpendicular to the direction in which the first conductive member 400 extends. The fixing portion 315 positions the first conductive member 400 in the Z direction, and the guide members 316 positions the first conductive member 400 in the Y direction.

[0097] The conductive members 40 other than the first conductive member 400 including the second conductive member 410 can also be fixed to the bus bar module 30 by the fixing portion 315. The fixing portion 315 may be a structure for positioning the conductive member 40 in both the Z direction and the Y direction.

[0098] Figure 8 This is a perspective view showing the structure of a substrate member included in the battery pack according to the first embodiment of the present technology. Fig. 9 Observe from the direction of the arrow on line IX-IX Figure 8A cross-sectional view of a structure near a substrate member.

[0099] like Figure 8 and Fig. 9 As shown, the battery pack 1 of the present embodiment further includes a substrate member 60 . The substrate member 60 detects the temperature of each of the plurality of battery cells 100 and controls the current value and the like. The substrate member 60 includes a control substrate 600 and a substrate cover 610 .

[0100] The control substrate 600 is disposed on at least the first stack 10A among the first stack 10A, the second stack 10B, and the third stack 10C in the third direction (Z direction). The control substrate 600 in this embodiment is disposed only on the first stack 10A via the first bus bar module 30A in the Z direction.

[0101] The substrate cover 610 has insulating properties and covers the control substrate 600 from the third direction (Z direction). The substrate cover 610 has an extended surface portion 611 and a folded portion 612 .

[0102] The extended surface portion 611 is a portion extending from the end of the upper surface of the substrate cover portion 610 on the side of the side wall 22 in the Y direction so as to cover the second conductive member 410. The folded portion 612 is a portion folded back at the end of the extended surface portion 611 in the Y direction so as to be located on the lower surface side of the second conductive member 410 in the Z direction.

[0103] The second conductive member 410 is supported by the extended surface portion 611 and the folded portion 612. Thus, the substrate cover portion 610 supports the second conductive member 410. The substrate cover portion 610 having insulating properties ensures insulating properties and suppresses vibration of the second conductive member 410.

[0104] In the battery pack 1 according to the first embodiment of the present technology, by overlapping the first conductive member 400 and the second conductive member 410 in the third direction (Z direction), the occupied area of ​​the conductive member 40 above the stacked body 10 when viewed from the Z direction can be reduced compared to the case where the first conductive member and the second conductive member are arranged on the same plane on the stacked body 10. As a result, it is possible to ensure space for arranging components other than the conductive member 40 above the stacked body 10, so that the space in the battery pack 1 can be effectively used.

[0105] In the battery pack 1 according to the first embodiment of the present technology, by disposing the cover portion 320 between the first conductive member 400 and the second conductive member 410 , interference between the first conductive member 400 and the second conductive member 410 can be suppressed.

[0106] In the battery pack 1 of embodiment 1 of the present technology, the cover portion 320 has a gap G relative to the first conductive member 400 and the fastening member 330, so that the cover portion 320 can move up and down in the Z direction. Therefore, when the second conductive member 410 vibrates, it can abut against the cover portion 320, and the vibration of the second conductive member 410 can be absorbed by the cover portion 320.

[0107] In the battery pack 1 according to the first embodiment of the present technology, by fixing the conductive member 40 using the fixing portion 315 of the cover member 310 , a structure strong against vibration can be achieved when the first conductive member 400 and the second conductive member 410 are overlapped in the Z direction.

[0108] In the battery pack 1 of embodiment 1 of the present technology, the second conductive member 410 is supported by the substrate cover portion 610 in the substrate member 60, thereby forming a structure in which the first conductive member 400 and the second conductive member 410 overlap in the Z direction, and even when the second conductive member 410 vibrates, the vibration of the second conductive member 410 can be suppressed.

[0109] In the battery pack 1 of embodiment 1 of the present technology, by extending the first conductive member 400 and the second conductive member 410 respectively in the second direction (X direction), the length of each of the first conductive member 400 and the second conductive member 410 can be shortened compared to the case where the first conductive member 400 and the second conductive member 410 are arranged to be inclined from the X direction, and the upper space in the battery pack 1 can be effectively utilized.

[0110] (Implementation method 2)

[0111] The battery pack of Embodiment 2 is described below. The battery pack of Embodiment 2 is different from the battery pack 1 of Embodiment 1 in the connection structure between the first conductive member and the stacked body, so the same structure as that of the battery pack 1 of Embodiment 1 will not be described repeatedly.

[0112] Fig.10 This is a perspective view showing the structure of a conductive member included in a battery pack according to a second embodiment of the present technology.

[0113] like Fig.10 As shown, the first conductive member 400A of the present embodiment is connected to the laminated body 10 by welding.

[0114] Specifically, a through hole (not shown) is provided in the first conductive member 400A. The through hole is irradiated with laser to form the joint portion 402. Thus, the electrode terminal of the battery cell in the stack is joined to the first conductive member 400A.

[0115] In the battery pack 1 according to the second embodiment of the present technology, by overlapping the first conductive member 400A and the second conductive member 410 in the third direction (Z direction), the occupied area of ​​the conductive member above the stacked body 10 when viewed from the Z direction can be reduced compared to the case where the first conductive member and the second conductive member are arranged on the same plane on the stacked body 10. As a result, it is possible to ensure space for arranging constituent members other than the conductive member above the stacked body 10, so that the space in the battery pack can be effectively used.

[0116] Although the embodiments of the present invention have been described, the embodiments disclosed this time should be considered to be illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the claims, and it is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A battery pack, wherein: The battery pack has: 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 arranged in the first direction; a third stack including a plurality of third battery cells arranged in the first direction; an electrical device electrically connected to the first stack, the second stack, and the third stack; a housing that accommodates the first stack, the second stack, the third stack, and the electrical device; a plate-shaped first conductive member electrically connecting the first stacked body and the second stacked body; and a plate-shaped second conductive member, the second conductive member electrically connecting the third stacked body and the electrical device, The housing includes a pair of side walls supporting the first stack, the second stack, and the third stack from both sides in the first direction. In a second direction orthogonal to the first direction, the electrical device, the first stack, the second stack, and the third stack are arranged in sequence. The first conductive member overlaps with the second conductive member in a third direction that is orthogonal to the first direction and the second direction.

2. The battery pack according to claim 1, wherein: The battery pack further includes a bus bar module, and the bus bar module is arranged 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 stack and the second stack; and a cover member that includes a cover portion that covers at least a portion of the first conductive member and the fastening member. In the third direction, the second conductive member overlaps with the cover portion.

3. The battery pack according to claim 2, wherein: The cover has a gap with respect to at least a portion of the first conductive member and the fastening member. The cover portion is movable in the third direction by an amount corresponding 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 includes a fixing portion capable of fixing the first conductive member and the second conductive member to the bus bar module.

5. The battery pack according to claim 1 or 2, wherein: The battery pack also has: a control substrate, the control substrate being arranged on at least the first stack among the first stack, the second stack, and the third stack in the third direction; as well as a substrate cover portion, the substrate cover portion covering the control substrate from the third direction, The substrate cover portion supports the second conductive member.

6. The battery pack according to claim 1 or 2, wherein: The first conductive member and the second conductive member each extend along the second direction.

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