Battery module

Abstract

To reduce the volume of a battery module in a condition where a space for performing a certain function is present.SOLUTION: A battery module 10 comprises a plurality of battery cells 100 and a structure 200. The plurality of battery cells 100 and the structure 200 are disposed so as to be aligned with one another. The structure 200 defines a first hollow space 210 and a second hollow space 220.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a battery module. [Background technology]

[0002] In recent years, various battery modules have been developed, each of which includes a plurality of battery cells.

[0003] Patent Document 1 describes a battery pack. The battery pack includes a plurality of battery cells and a housing that houses the plurality of battery cells. The plurality of battery cells are grouped into a first battery group and a second battery group. The housing has a beam disposed between the first battery group and the second battery group. The beam forms a path for discharging heat and gas.

[0004] Patent Document 2 describes a battery wiring module used in a cell group including a plurality of cells. The battery wiring module includes a plurality of bus bars and a flexible printed circuit (FPC). Each bus bar connects a positive terminal of one of adjacent cells to a negative terminal of the other adjacent cell. The FPC has a plurality of voltage detection lines connected to the plurality of bus bars. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] US Patent Application Publication No. 2022 / 0123423 [Patent Document 2] Japanese Patent Application Publication No. 2017-27831 Summary of the Invention [Problem to be solved by the invention]

[0006] A battery module may require spaces to perform certain functions, such as spaces for passing wiring electrically connected to the battery cells, spaces for passing gas generated from the battery cells when the battery cells abnormally heat up, etc. However, if such spaces are simply provided inside the battery module, it may be difficult to reduce the volume of the battery module.

[0007] One object of the present invention is to reduce the volume of a battery module while still providing sufficient space for certain functions. Other objects of the present invention will become apparent from the description herein. [Means for solving the problem]

[0008] One aspect of the present invention is as follows. 1. A plurality of battery cells; a structure; Equipped with the plurality of battery cells and the structure are arranged side by side, The structure defines a hollow space. 2. The battery module described in 1., wherein at least a portion of the structure is located between at least one battery cell and at least one other battery cell. 3. Further comprising wiring electrically connected to the battery cell; 3. The battery module according to 1. or 2., wherein at least a portion of the wiring passes through the hollow space. 4. The battery module according to any one of 1 to 3, wherein at least a portion of the structure has heat insulating properties. 5. The battery module according to any one of 1. to 4., wherein the structure reinforces the plurality of battery cells. 6. The battery module according to any one of 1. to 5., wherein the hollow space serves as a passage for gas generated from the battery cells. 7. The battery module according to any one of 1. to 6., wherein the structure defines a plurality of the hollow spaces that are separated from one another. [Effects of the Invention]

[0009] According to the above aspect of the present invention, the volume of the battery module can be reduced while still providing space for performing certain functions. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a battery module according to an embodiment. [Figure 2] FIG. 2 is a top view of the battery module according to the embodiment. [Figure 3] 10A to 10C are diagrams illustrating an example of a method of using the battery module according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, similar components are designated by similar reference numerals, and the description thereof will be omitted as appropriate.

[0012] Fig. 1 is a perspective view of a battery module 10 according to an embodiment, and Fig. 2 is a top view of the battery module 10 according to an embodiment.

[0013] For the purpose of explanation, the X, Y, and Z directions are shown in each figure. The X direction indicates the front-rear direction of the battery module 10. The Y direction is perpendicular to the X direction. The Y direction indicates the left-right direction of the battery module 10. The Z direction is perpendicular to both the X and Y directions. The Z direction indicates the up-down direction of the battery module 10. The arrow pointing to the X direction, the arrow pointing to the Y direction, and the arrow pointing to the Z direction indicate the front, left, and up directions of the battery module 10, respectively. In FIG. 2, the white circle with a black dot indicating the Z direction indicates that the arrow pointing to the Z direction extends from the back to the front of the page. The relationship between the X direction, Y direction, and Z direction and the front-rear direction, left-right direction, and up-down direction of the battery module 10 is not limited to the example described in the embodiment.

[0014] Hereinafter, as needed, the side indicated by the arrow indicating the X direction will be referred to as the +X side, and the side opposite the side indicated by the arrow indicating the X direction will be referred to as the -X side. Hereinafter, as needed, the side indicated by the arrow indicating the Y direction will be referred to as the +Y side, and the side opposite the side indicated by the arrow indicating the Y direction will be referred to as the -Y side. Hereinafter, as needed, the side indicated by the arrow indicating the Z direction will be referred to as the +Z side, and the side opposite the side indicated by the arrow indicating the Z direction will be referred to as the -Z side.

[0015] The battery module 10 includes a plurality of battery cells 100 and a structure 200. Each battery cell 100 has a battery element 110, a pair of terminals 120, a pair of lid materials 130, and an exterior film 140. In Fig. 2, the pair of lid materials 130 and the exterior film 140 present inside the exterior film 140 are shown by dashed lines.

[0016] The X-direction dimension of the battery cell 100 is the dimension in the longitudinal direction of the battery cell 100. The Z-direction dimension of the battery cell 100 is the dimension in the lateral direction of the battery cell 100. The Y-direction dimension of the battery cell 100 is the dimension in the thickness direction of the battery cell 100. The shape of the battery cell 100 is not limited to this example.

[0017] The battery element 110 has a substantially rectangular parallelepiped shape. The dimension of the battery element 110 in the X direction is the dimension in the longitudinal direction of the battery element 110. The dimension of the battery element 110 in the Z direction is the dimension in the lateral direction of the battery element 110. The dimension of the battery element 110 in the Y direction is the dimension in the thickness direction of the battery element 110. The shape of the battery element 110 is not limited to this example.

[0018] The battery element 110 includes at least one positive electrode (not shown), at least one negative electrode (not shown), and at least one separator (not shown). For example, multiple positive electrodes and multiple negative electrodes are alternately stacked in the Y direction. At least a portion of the separator is located between adjacent positive electrodes and negative electrodes in the Y direction. For example, multiple sheet-like separators may each be located between adjacent positive electrodes and negative electrodes in the Y direction. Alternatively, a single sheet-like separator may have a zigzag shape that passes through the region between adjacent positive electrodes and negative electrodes in the Y direction. Alternatively, the positive electrode, negative electrode, and separator may be wound so that the separator is located between the positive electrode and negative electrode. In one example, the positive electrode, negative electrode, and separator are wound with both surfaces of one of the positive electrode and negative electrode covered by the separator. In another example, a stack including multiple unit stacks each including a positive electrode, a separator, and a negative electrode in this order may be wound. However, the winding structure of the positive electrode, negative electrode, and separator is not limited to these examples.

[0019] The battery cell 100 may be an all-solid-state battery. In an all-solid-state battery, a solid electrolyte layer is provided in the portion corresponding to the separator. An all-solid-state battery does not contain an electrolyte solution. Hereinafter, unless otherwise specified, the battery cell 100 will be described as a battery cell containing an electrolyte solution.

[0020] A pair of terminals 120 are located on both sides of the battery element 110 in the X direction. Each terminal 120 is, for example, a conductor such as metal. One of the pair of terminals 120 and the positive electrode of the battery element 110 are electrically connected to each other. The other of the pair of terminals 120 and the negative electrode of the battery element 110 are electrically connected to each other. Therefore, the polarities of the pair of terminals 120 of each battery element 110 are opposite to each other.

[0021] The pair of lid members 130 cover both end faces of the battery element 110 in the X direction. Each lid member 130 is, for example, a resin body. When viewed from the X direction, each lid member 130 has a substantially rectangular shape with a pair of short sides parallel to the Y direction and a pair of long sides parallel to the Z direction. The +X-side terminal 120 at least partially protrudes toward the +X side from the +X-side surface of the +X-side lid member 130 when the +X-side lid member 130 covers the +X-side end face of the battery element 110. The −X-side terminal 120 at least partially protrudes toward the −X side from the −X-side surface of the −X-side lid member 130 when the −X-side lid member 130 covers the −X-side end face of the battery element 110.

[0022] As shown in FIG. 1 , each lid member 130 includes a valve 132. The valve 132 is located on the +Z side relative to the terminal 120. However, the number and location of the valves 132 are not limited to this example. When the battery cell 100 generates abnormal heat, gas may be generated from inside the battery cell 100. For example, when the battery cell 100 generates abnormal heat, gas may be generated from the battery element 110 or the electrolyte inside the battery cell 100. When gas is generated from inside the battery cell 100, the valve 132 opens to discharge the gas from inside the battery cell 100 to the outside of the battery cell 100. Thus, the valve 132 serves as a gas discharge portion for discharging gas generated from inside the battery cell 100. In one example, the valve 132 is formed by partially thinning the thickness of the lid member 130. However, the structure of the valve 132 is not limited to this example.

[0023] The exterior film 140 is wrapped around the battery element 110 and the pair of lid members 130 in the X direction. The outer peripheral surface around the X direction of the lid member 130 on the +X side and the inner peripheral surface around the X direction of the end of the +X side of the exterior film 140 are joined to each other by a joining method such as heat fusion. The outer peripheral surface around the X direction of the lid member 130 on the -X side and the inner peripheral surface around the X direction of the end of the -X side of the exterior film 140 are joined to each other by a joining method such as heat fusion. Portions of the exterior film 140 are joined to each other by a joining method such as heat fusion at least in parts around the X direction of the battery element 110. Thus, the battery element 110 is sealed by the exterior film 140.

[0024] The structure 200 has a substantially rectangular parallelepiped shape. The dimension of the structure 200 in the X direction is the dimension in the longitudinal direction of the structure 200. The dimension of the structure 200 in the Z direction is the dimension in the lateral direction of the structure 200. The dimension of the structure 200 in the Y direction is the dimension in the thickness direction of the structure 200. The shape of the structure 200 is not limited to this example.

[0025] The multiple battery cells 100 and the structure 200 are arranged side by side in the Y direction. In the embodiment, at least a portion of the structure 200 is located between at least one battery cell 100 and at least one other battery cell 100 in the Y direction. Therefore, the structure 200 can insulate the at least one battery cell 100 located on the −Y side of the structure 200 from the at least one other battery cell 100 located on the +Y side of the structure 200. Therefore, even if abnormal heat generation occurs in the at least one battery cell 100, the structure 200 can suppress heat conduction between the at least one battery cell 100 located on the −Y side of the structure 200 and the at least one other battery cell 100 located on the +Y side of the structure 200.

[0026] In the example shown in FIGS. 1 and 2 , the structure 200 is located between three battery cells 100 arranged side by side in the Y direction and three other battery cells 100 arranged side by side in the Y direction. Therefore, the structure 200 is located approximately in the center in the Y direction of a stacked structure including six battery cells 100 and structures 200. However, the number and positions of the plurality of battery cells 100 and structures 200 are not limited to those shown in FIGS. 1 and 2 . As long as the plurality of battery cells 100 and structures 200 are arranged side by side in the Y direction, at least one structure 200 can be located at any position relative to the plurality of battery cells 100. In one example, the structure 200 may be located offset in the Y direction from approximately the center of the battery module 10 in the Y direction. In this example, the structure 200 may be located on the −Y side of the battery cell 100 located at the −Y end, or on the +Y side of the battery cell 100 located at the +Y end. Alternatively, the plurality of structures 200 may be located offset from each other in the Y direction.

[0027] In the example shown in FIGS. 1 and 2 , the multiple battery cells 100 and the structures 200 are arranged side by side at approximately equal pitches in the Y direction. Specifically, the Y direction dimensions of each battery cell 100 and the Y direction dimensions of the structures 200 are approximately equal. Therefore, the multiple battery cells 100 and the structures 200 can be easily arranged side by side at approximately equal pitches in the Y direction. However, the Y direction dimensions of each battery cell 100 and the Y direction dimensions of the structures 200 may be different from each other. Alternatively, or in addition, the Y direction pitch of the multiple battery cells 100 and the structures 200 may be different depending on the position of the battery module 10 in the Y direction. The battery cells 100 adjacent to each other in the Y direction may be in contact with each other, or may be arranged side by side with a member such as a compression pad (not shown) interposed therebetween. The battery cells 100 and the structures 200 adjacent to each other in the Y direction may also be in contact with each other, or may be arranged side by side with a member such as a compression pad (not shown) interposed therebetween.

[0028] The plurality of battery cells 100 are electrically connected in series, in parallel, or in a combination of series and parallel.

[0029] An example will be described in which multiple battery cells 100 are connected in series. In this example, the polarities of the +X-side terminals 120 of adjacent battery cells 100 in the Y direction are different from each other, and the polarities of the -X-side terminals 120 of adjacent battery cells 100 in the Y direction are different from each other. The multiple battery cells 100 are connected in series in order from the battery cell 100 at one end in the Y direction to the battery cell 100 at the other end in the Y direction, with the +X-side terminals 120 of adjacent battery cells 100 in the Y direction electrically connected to each other via a bus bar (not shown) or the -X-side terminals 120 of adjacent battery cells 100 in the Y direction electrically connected to each other via a bus bar (not shown).

[0030] An example will be described in which multiple battery cells 100 are connected in parallel. In this example, the +X side terminals 120 of the multiple battery cells 100 have the same polarity, and the −X side terminals 120 of the multiple battery cells 100 have the same polarity. The multiple battery cells 100 are connected in parallel in a state in which the +X side terminals 120 of the multiple battery cells 100 are electrically connected to each other via a bus bar (not shown), and the −X side terminals 120 of the multiple battery cells 100 are electrically connected to each other via a bus bar (not shown).

[0031] An example will be described in which a plurality of battery cells 100 are connected in a combination of series and parallel. In this example, the plurality of battery cells 100 includes a plurality of cell groups, each including at least two battery cells 100 connected in parallel via a bus bar (not shown). The method of connecting at least two battery cells 100 in parallel in each cell group can be the same as the method of connecting a plurality of battery cells 100 in parallel. The plurality of cell groups are connected in series via a bus bar (not shown). The method of connecting a plurality of cell groups in series can be the same as the method of connecting a plurality of battery cells 100 in series.

[0032] 1 and 2 , three battery cells 100 located on the −Y side of the structure 200 may be connected in parallel, and the other three battery cells 100 located on the +Y side of the structure 200 may be connected in parallel, and the three battery cells 100 located on the −Y side of the structure 200 may be connected in series with the other three battery cells 100 located on the +Y side of the structure 200. Alternatively, three battery cells 100 located on the −Y side of the structure 200 may be connected in series, and the other three battery cells 100 located on the +Y side of the structure 200 may be connected in series with the other three battery cells 100 located on the −Y side of the structure 200. However, the electrical connection of the multiple battery cells 100 is not limited to these examples.

[0033] The structure 200 defines a first hollow space 210 and a second hollow space 220. The first hollow space 210 and the second hollow space 220 penetrate the structure 200 in the X direction. The first hollow space 210 and the second hollow space 220 are aligned in the Z direction. Specifically, the first hollow space 210 and the second hollow space 220 are separated from each other by a portion of the structure 200 between the first hollow space 210 and the second hollow space 220. However, the number and arrangement of the hollow spaces, such as the first hollow space 210 and the second hollow space 220, are not limited to the number and arrangement shown in FIGS. 1 and 2. For example, the structure 200 may define only one hollow space or three or more hollow spaces.

[0034] The first hollow space 210 and the second hollow space 220 can be spaces for performing certain functions, such as spaces for passing wiring electrically connected to the battery cells 100 or spaces for passing gas generated from the battery cells 100 when the battery cells 100 abnormally heat up. Therefore, in the embodiment, the spaces for performing the functions can be arranged side by side in the Y direction together with the plurality of battery cells 100. This allows the volume of the battery module 10 to be smaller than when the spaces for performing the functions are simply provided inside the battery module 10 without using the structure 200. In particular, when the structure 200 includes a plurality of hollow spaces separated from each other, such as the first hollow space 210 and the second hollow space 220, the hollow spaces can be assigned different functions. For example, one of the first hollow space 210 and the second hollow space 220 can be a space for passing wiring electrically connected to the battery cells 100, and the other of the first hollow space 210 and the second hollow space 220 can be a space for passing gas generated from the battery cells 100.

[0035] FIG. 3 is a diagram for explaining an example of a method of using the battery module 10 according to the embodiment.

[0036] The battery module 10 shown in FIG. 3 includes a plurality of battery cells 100, a structure 200, a first voltage detection device 300, a second voltage detection device 400, and a connector 500. For ease of explanation, three battery cells 100 located on the +Y side of the structure 200 are not shown in FIG. 3. In the example shown in FIG. 3, similar to the examples shown in FIGS. 1 and 2, the battery module 10 includes three battery cells 100 located on the +Y side of the structure 200. The first voltage detection device 300 shown in FIG. 3 is a schematic representation of the first voltage detection device 300 as viewed from the X direction. The second voltage detection device 400 shown in FIG. 3 is a schematic representation of the second voltage detection device 400 as viewed from the X direction.

[0037] The battery module 10 will be described with reference to FIG. 3 and, if necessary, with reference to FIGS.

[0038] The first voltage detection device 300 is provided to detect the voltages of multiple terminals 120 on the +X side of multiple battery cells 100. The first voltage detection device 300 has a first protector 310, multiple first voltage detection terminals 320, and multiple first voltage detection lines 330.

[0039] The first protector 310 is made of an insulating material such as resin. The first protector 310 defines a plurality of first openings 312. The plurality of first openings 312 are aligned in the Y direction. The first protector 310 covers the +X side portions of the plurality of battery cells 100, with the plurality of terminals 120 on the +X side of the plurality of battery cells 100 exposed toward the +X side through the plurality of first openings 312.

[0040] Each first voltage detection terminal 320 is made of a conductor such as metal. Each first voltage detection terminal 320 and each terminal 120 on the +X side are joined to each other by a joining method such as laser welding. Therefore, each first voltage detection terminal 320 and each terminal 120 on the +X side are electrically connected to each other.

[0041] Each first voltage detection line 330 is, for example, a wire such as a harness. Each of the plurality of first voltage detection terminals 320 and one end of each of the plurality of first voltage detection lines 330 are electrically connected to each other.

[0042] The second voltage detection device 400 is provided to detect the voltages of the multiple terminals 120 on the -X side of the multiple battery cells 100. The second voltage detection device 400 has a second protector 410, multiple second voltage detection terminals 420, and multiple second voltage detection lines 430.

[0043] The second protector 410 is made of an insulating material such as resin. The second protector 410 defines a plurality of second openings 412. The plurality of second openings 412 are aligned in the Y direction. The second protector 410 covers the -X side portions of the plurality of battery cells 100, with the plurality of terminals 120 on the -X side of the plurality of battery cells 100 exposed toward the -X side through the plurality of second openings 412.

[0044] Each second voltage detection terminal 420 is made of a conductor such as metal. Each second voltage detection terminal 420 and each terminal 120 on the -X side are joined to each other by a joining method such as laser welding. Therefore, each second voltage detection terminal 420 and each terminal 120 on the -X side are electrically connected to each other.

[0045] Each second voltage detection line 430 is, for example, a wire such as a harness. Each of the plurality of second voltage detection terminals 420 and one end of each of the plurality of second voltage detection lines 430 are electrically connected to each other.

[0046] The connector 500 is electrically connected to the other end of each of the multiple first voltage detection lines 330 and the other end of each of the multiple second voltage detection lines 430. Therefore, the connector 500 and the multiple terminals 120 on the +X sides of the multiple battery cells 100 are electrically connected to each other via the multiple first voltage detection lines 330, and the connector 500 and the multiple terminals 120 on the −X sides of the multiple battery cells 100 are electrically connected to each other via the multiple second voltage detection lines 430.

[0047] In the example shown in FIG. 3 , the first hollow space 210 and the second hollow space 220 are spaces through which at least a portion of the wiring electrically connected to the battery cells 100 passes. Specifically, the connector 500 is located on the −X side with respect to the center of the multiple battery cells 100 in the X direction. Therefore, each first voltage detection wire 330 needs to be routed from each terminal 120 on the +X side toward the −X side. In the example shown in FIG. 3 , three first voltage detection wires 330 electrically connected to three terminals 120 on the +X side of three battery cells 100 located on the −Y side with respect to the structure 200 are routed toward the −X side through the first hollow space 210. Furthermore, three first voltage detection wires 330 electrically connected to three terminals 120 on the +X side of three battery cells 100 located on the +Y side with respect to the structure 200 are routed toward the −X side through the second hollow space 220. Therefore, each first voltage detection wire 330 can be routed from each terminal 120 on the +X side to the connector 500 via the first hollow space 210 or the second hollow space 220. On the other hand, each second voltage detection wire 430 can be routed from each terminal 120 on the −X side to the connector 500 without passing through the first hollow space 210 and the second hollow space 220. Therefore, in the example shown in Fig. 3, each second voltage detection wire 430 is routed from each terminal 120 on the −X side to the connector 500 without passing through the first hollow space 210 and the second hollow space 220.

[0048] The routing method of the multiple first voltage detection wires 330 and the multiple second voltage detection wires 430 is not limited to the example shown in Fig. 3. For example, all of the six first voltage detection wires 330 shown in Fig. 3 may be routed through only one of the first hollow space 210 and the second hollow space 220. Alternatively, when the connector 500 is located on the +X side with respect to the center portion of the multiple battery cells 100 in the X direction, the multiple first voltage detection wires 330 may be routed without passing through the first hollow space 210 and the second hollow space 220, while the multiple second voltage detection wires 430 may be routed through at least one of the first hollow space 210 and the second hollow space 220.

[0049] At least a portion of the structure 200 may have thermal insulation properties. For example, the structure 200 may be made of a thermal insulating material. Alternatively, or in addition, the first hollow space 210 and the second hollow space 220 may have thermal insulation properties. In the example shown in FIGS. 1 to 3 , when at least a portion of the structure 200 has thermal insulation properties, the three battery cells 100 located on the −Y side of the structure 200 can be more effectively insulated from the other three battery cells 100 located on the +Y side of the structure 200 compared to when the structure 200 does not have thermal insulation properties. Therefore, even if abnormal heat generation occurs in at least one battery cell 100, the structure 200 can more effectively suppress heat conduction between the three battery cells 100 located on the −Y side of the structure 200 and the other three battery cells 100 located on the +Y side of the structure 200 compared to when the structure 200 does not have thermal insulation properties. 1 to 3, when at least a portion of the structure 200 has thermal insulation properties, the structure 200 can perform both the functions of insulation and routing of wiring such as the first voltage detection wire 330 and the second voltage detection wire 430. Therefore, the volume of the battery module 10 can be made smaller than when a structure for thermal insulation and a structure for routing of wiring are provided separately.

[0050] The structure 200 may reinforce the multiple battery cells 100. The dimensions of the stacked structure including the multiple battery cells 100 and the structure 200 are relatively large. Therefore, by providing the structure 200 for any part of the multiple battery cells 100, the strength of the multiple battery cells 100 can be reinforced. In the example shown in FIGS. 1 to 3, when the structure 200 reinforces the multiple battery cells 100, the structure 200 can perform both the functions of reinforcement and routing wiring such as the first voltage detection wire 330 and the second voltage detection wire 430. Therefore, the volume of the battery module 10 can be reduced compared to when a structure for the reinforcement function and a structure for the routing wiring function are provided separately.

[0051] The use of the structure 200 is not limited to the example shown in FIG.

[0052] At least one of the first hollow space 210 and the second hollow space 220 may serve as a path for passing gas generated from the valve 132 when the battery cell 100 abnormally heats up. In one example, wiring such as the first voltage detection wire 330 and the second voltage detection wire 430 may be routed through one of the first hollow space 210 and the second hollow space 220, and gas generated from the valve 132 may pass through the other of the first hollow space 210 and the second hollow space 220. In this example, the structure 200 can function as both a gas path and a wiring route for the first voltage detection wire 330, the second voltage detection wire 430, and the like. Therefore, the volume of the battery module 10 can be reduced compared to when a structure for the gas path function and a structure for the wiring route function are separately provided. However, the gas may be passed through both the first hollow space 210 and the second hollow space 220 without passing the wires through either the first hollow space 210 or the second hollow space 220. Alternatively, the gas may be passed through the hollow space through which the wires pass.

[0053] Although the embodiments of the present invention have been described above with reference to the drawings, these are merely examples of the present invention, and various other configurations can also be adopted. [Explanation of symbols]

[0054] 10 battery module, 100 battery cell, 110 battery element, 120 terminal, 130 lid material, 132 valve, 140 exterior film, 200 structure, 210 first hollow space, 220 second hollow space, 300 first voltage detection device, 310 first protector, 312 first opening, 320 first voltage detection terminal, 330 first voltage detection line, 400 second voltage detection device, 410 second protector, 412 second opening, 420 second voltage detection terminal, 430 second voltage detection line, 500 connector

Claims

1. A plurality of battery cells; A structure, Equipped with The plurality of battery cells and the structure are arranged side by side, The structure defines a hollow space.

2. The battery module of claim 1 , wherein at least a portion of the structure is located between at least one battery cell and at least one other battery cell.

3. a wiring electrically connected to the battery cell; The battery module according to claim 1 , wherein at least a portion of the wiring passes through the hollow space.

4. The battery module according to claim 1 , wherein at least a portion of the structure has thermal insulation properties.

5. The battery module according to claim 1 , wherein the structural body reinforces the plurality of battery cells.

6. The battery module according to claim 1 , wherein the hollow space serves as a passage for passing gas generated from the battery cells.

7. The battery module according to claim 1 , wherein the structure defines a plurality of the hollow spaces separated from one another.

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