Battery pack

Abstract

This battery pack features a configuration that effectively utilizes the space within the case, thereby suppressing the need to increase the size of the case. [Solution] A battery pack 1 comprises a battery module 20 including a plurality of battery cells 2 arranged in a first direction, and a case 40 that houses two or more battery modules 20, wherein the case 40 includes a case body 43 having a bottom 41 and a side wall portion 42 surrounding the bottom 41, a lid 44 covering an opening 43a of the case body 43, and a partition plate 45 separating the battery module 20 located on the bottom 41 side from the battery module 20 located on the lid 44 side, wherein the partition plate 45 is fixed to the side wall portion 42 so that one battery module 20 is located between the partition plate 45 and the bottom 41, and another battery module 20 is located between the partition plate 45 and the lid 44.

Description

Technical Field

[0001] This technology relates to a battery pack.

Background Art

[0002] A structure in which battery modules are arranged in two stages inside the case of a battery pack is disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2023-012759). By arranging the battery modules in two stages, improvement in the energy density and miniaturization of the battery pack can be achieved. <00000​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​[1] A battery pack comprising a battery module including a plurality of battery cells arranged in a first direction, and a case housing two or more of the battery modules, wherein the case includes a case body having a bottom and a side wall surrounding the bottom, a lid covering an opening in the case body, and a partition plate separating the battery modules located on the bottom side from the battery modules located on the lid side, wherein the partition plate is fixed to the side wall so that one of the battery modules is located between the partition plate and the bottom, and another battery module is located between the partition plate and the lid.

[0007] [2] The battery pack according to [1], wherein the side wall portion includes a first side wall portion located in a second direction perpendicular to the first direction and a second side wall portion located opposite to the first side wall portion, the first side wall portion is provided with a first main step portion on which one end of the partition plate is placed, and the second side wall portion is provided with a second main step portion on which the other end of the partition plate is placed, and the partition plate is arranged to bridge the space between the first main step portion and the second main step portion.

[0008] [3] The battery pack according to [1] or [2], wherein the battery module includes a first end and a second end located in the first direction, a first support member is fixed to the first end, extending in a second direction perpendicular to the first direction and having both ends protruding from the end of the battery module, a second support member is fixed to the second end, extending in the second direction and having both ends protruding from the end of the battery module, the bottom-side battery module positioned between the partition plate and the bottom has the first support member and the second support member fixed to the side wall, and the lid-side battery module positioned between the partition plate and the lid has the first support member and the second support member fixed to the partition plate.

[0009] [4] The battery pack according to [3], wherein the side wall portion includes a first side wall portion located in a second direction perpendicular to the first direction and a second side wall portion located opposite to the first side wall portion, and with respect to the battery module on the bottom side, one end of the first support member and one end of the second support member are fixed to the first side wall portion, and the other end of the first support member and the other end of the second support member are fixed to the second side wall portion.

[0010] [5] The battery pack described in [4], wherein two battery modules are arranged side by side in the second direction on the bottom side, a bottom vertical wall extending in the first direction is provided at the bottom between the two battery modules, the other end of the first support member of one battery module is fixed to the bottom vertical wall, the other end of the second support member of one battery module is fixed to the bottom vertical wall, the other end of the second support member of the other battery module is fixed to the bottom vertical wall, and the partition plate is fixedly supported to the bottom vertical wall.

[0011] [6] The battery pack according to any one of [3] to [5], wherein the side wall portion includes a first side wall portion located in a second direction perpendicular to the first direction and a second side wall portion located opposite to the first side wall portion, and the partition plate has a main plate located parallel to the bottom portion, a first side wall plate located on the side of the first side wall portion, and a second side wall plate located on the side of the second side wall portion, with one end of the first support member and one end of the second support member fixed to the first side wall plate, and the other end of the first support member and the other end of the second support member fixed to the second side wall plate.

[0012] [7] The battery pack according to [6], wherein two battery modules are arranged in the second direction on the lid side, and a partition plate between the two battery modules is provided with a partition plate vertical wall extending in the first direction, the other end of the first support member of one battery module is fixed to the partition plate vertical wall, and the other end of the first support member of the other battery module is fixed to the partition plate vertical wall, and the other end of the second support member of one battery module is fixed to the partition plate vertical wall, and the other end of the second support member of the other battery module is fixed to the partition plate vertical wall.

[0013] [8] The battery pack according to [7], wherein two of the battery modules are arranged side by side in the second direction on the bottom side, and a bottom vertical wall extending in the first direction is provided at the bottom between the two battery modules, and the partition plate vertical wall is fixed to the bottom vertical wall.

[0014] [9] The battery pack according to any one of items [1] to [8], wherein a bottom-side cooling member is disposed between the battery module and the bottom, and a partition plate-side cooling member is disposed between the battery module and the partition plate. [Effects of the Invention]

[0015] The objective of this technology is to provide a battery pack with a configuration that can suppress the increase in case size by effectively utilizing the space inside the case. [Brief explanation of the drawing]

[0016] [Figure 1] This is a perspective view showing the configuration of the battery pack according to the embodiment. [Figure 2] This is an exploded perspective view of the battery pack in the embodiment. [Figure 3] This is a cross-sectional view taken along the line III-III in Figure 1. [Figure 4] This is a cross-sectional view taken along line IV in Figure 1. [Modes for carrying out the invention]

[0017] The embodiments of the present technology will be described below. The same or corresponding parts may be denoted by the same reference numerals, and the description thereof may not be repeated.

[0018] In the embodiments described below, when referring to the number, amount, etc., unless otherwise specified, the scope of the present technology is not necessarily limited to such number, amount, etc. In the following embodiments, each component is not necessarily essential for the present technology, unless otherwise specified. The present technology is not limited to necessarily achieving all the effects described in the present embodiments.

[0019] In this specification, the descriptions of "comprise", "include", and "have" are in an open - ended form. That is, when including a certain configuration, other configurations outside the said configuration may or may not be included.

[0020] In this specification, when geometric terms and terms representing positional and directional relationships, such as "parallel", "orthogonal", "diagonal 45°", "coaxial", "along", etc., are used, these terms allow for manufacturing errors or slight variations. In this specification, when terms representing relative positional relationships such as "upper side", "lower side", etc., are used, these terms are used to indicate the relative positional relationship in one state, and depending on the installation direction of each mechanism (for example, turning the entire mechanism upside down, etc.), the relative positional relationship can be reversed or rotated at an arbitrary angle.

[0021] In this specification, the "battery" is not limited to a lithium - ion battery and may include other batteries such as nickel - hydrogen batteries and sodium - ion batteries. In this specification, the "electrode" may be a general term for the positive electrode and the negative electrode.

[0022] The "battery pack" in this specification can be mounted on hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), battery electric vehicles (BEV), etc. The use of the "battery pack" in this specification is not limited to in-vehicle use.

[0023] In the following description, the direction in which a plurality of battery cells are arranged in one battery module is the first direction (X direction in the figure), the battery modules are arranged in parallel in the same plane, and the direction orthogonal to the first direction (X direction in the figure) is the second direction (Y direction in the figure), and the direction in which the battery modules are arranged in two stages is the third direction (Z direction in the figure). For the sake of easy understanding of this technology, there are some places where the dimensional ratios of each component in the drawings are shown as changed from the actual dimensional ratios.

[0024] (Battery Pack 1) Referring to FIGS. 1 and 2, the overall configuration of the battery pack 1 will be described. The battery pack 1 includes a battery module 20 including a plurality of battery cells 2 arranged in the first direction (X direction), and a case 40 that houses two or more of the battery modules 20. The battery cell 2 has a rectangular external shape. In the battery module 20, a plurality of battery cells 2 arranged in the first direction are fixed to be integrated by a binding bar 20b or the like.

[0025] In this embodiment, inside the case 40, the battery modules 20 are arranged in two rows in the second direction (Y direction), and the battery modules 20 are stacked in two stages in the third direction (Z direction), and a total of four battery modules 20 are housed in the case 40. The number of battery modules 20 housed in the case 40 may be one or more as long as the battery modules 20 are stacked in two stages in the third direction (Z direction).

[0026] Inside the case 40, as shown in the diagram, a bottom-side cooling member 50, two rows of battery modules 20, a partition plate 45, a partition plate-side cooling member 51, and two rows of battery modules 20 are housed from bottom to top, and the top opening 43a of the case 40 is closed by a lid 44. The lid 44 is fixed to the case 40 using bolts or the like (not shown).

[0027] The partition plate 45 is fixed to the side wall portion 42 of the case 40, so that one or more battery modules 20 are placed between the partition plate 45 and the bottom portion 41, and one or more battery modules 20 are placed between the partition plate 45 and the lid 44.

[0028] (Case 40) The specific configuration of case 40 will be described with reference to Figures 2 and 3. Case 40 includes a case body 43 and a lid 44. The case body 43 has a bottom 41 and side walls 42 surrounding the bottom 41. Inside the case body 43, a partition plate 45 is arranged to separate the battery module 20 located on the bottom 41 side from the battery module 20 located on the lid 44 side.

[0029] The side wall portion 42 includes a first side wall portion 42a located in a second direction (Y direction) perpendicular to the first direction (X direction), and a second side wall portion 42b positioned opposite the first side wall portion 42a. Furthermore, the side wall portion 42 includes a third side wall portion 42c located in the first direction (X direction), and a fourth side wall portion 42d positioned opposite the third side wall portion 42c.

[0030] In this embodiment, the bottom portion 41 is rectangular in shape, and a first side wall portion 42a, a second side wall portion 42b, a third side wall portion 42c, and a fourth side wall portion 42d are provided surrounding the bottom portion 41 to constitute a box-shaped case body 43.

[0031] A first main step portion 42a1 for supporting the partition plate 45 is provided on the inner circumferential surface of the first side wall portion 42a, extending in the first direction (X direction). A second main step portion 42b1 for supporting the partition plate 45 is provided on the inner circumferential surface of the second side wall portion 42b, extending in the first direction (X direction).

[0032] An eleventh auxiliary step portion 42a11 is provided in the region of the inner circumferential surface of the first side wall portion 42a adjacent to the third side wall portion 42c, for resting one end of the first support member 21, which will be described later. A twelfth auxiliary step portion 42a12 is provided in the region of the inner circumferential surface of the first side wall portion 42a adjacent to the fourth side wall portion 42d, for resting one end of the second support member 22, which will be described later.

[0033] A 21st auxiliary step portion 42b11 for resting the other end of the first support member 21 is provided in the region of the inner circumferential surface of the second side wall portion 42b that is close to the third side wall portion 42c. A 22nd auxiliary step portion 42b12 for resting the other end of the second support member 22 is provided in the region of the inner circumferential surface of the second side wall portion 42b that is close to the fourth side wall portion 42d.

[0034] In this embodiment, a configuration is adopted in which two rows of battery modules 20 are arranged in the second direction (Y direction). Therefore, a bottom vertical wall 42e extending in the first direction (X direction) is provided at the bottom 41 between the two battery modules 20.

[0035] A 31st auxiliary step portion 42e11 is provided in the region adjacent to the third side wall portion 42c of the bottom vertical wall 42e for resting the other end and one end of the first support member 21. A 32nd auxiliary step portion 42e12 is provided in the region adjacent to the fourth side wall portion 42d of the bottom vertical wall 42e for resting the other end and one end of the second support member 22.

[0036] (Partition plate 45) The specific configuration of the partition plate 45 will be described with reference to Figures 2 and 3. The partition plate 45 serves to separate the battery module 20 located on the bottom side 41 (bottom side) from the battery module 20 located on the lid side 44 (lid side).

[0037] The partition plate 45 includes a main plate 46 positioned parallel to the bottom portion 41, a first side wall plate 47 located on the side of the first side wall portion 42a, and a second side wall plate 48 located on the side of the second side wall portion 42b. The first side wall plate 47 and the second side wall plate 48 are positioned upright relative to the main plate 46 and extend in a first direction (X direction).

[0038] One end of the main plate 46 is fixed to the first main step portion 42a1 provided on the first side wall portion 42a, and the other end of the main plate 46 is fixed to the second main step portion 42b1 provided on the second side wall portion 42b. As a result, the partition plate 45 is positioned to bridge the gap between the first main step portion 42a1 and the second main step portion 42b1.

[0039] Specifically, the first side wall plate 47 has multiple bolt through holes BH1 that penetrate in the third direction (Z direction) and are provided at a predetermined pitch along the first direction (X direction). Multiple screw holes BH2 are provided in the first main step portion 42a1 at positions opposite to the bolt through holes BH1. By fastening bolts B1 that have passed through the bolt through holes BH1 into the screw holes BH2, one end of the main plate 46 is fastened and fixed to the first main step portion 42a1.

[0040] Similarly, the second side wall plate 48 has multiple bolt through holes BH1 that penetrate in the third direction (Z direction) at a predetermined pitch along the first direction (X direction). Multiple screw holes BH2 are provided in the second main step portion 42b1 at positions opposite to the bolt through holes BH1. By fastening bolts B1 that have passed through the bolt through holes BH1 into the screw holes BH2, the other end of the main plate 46 is fastened and fixed to the second main step portion 42b1.

[0041] In this embodiment, a configuration is adopted in which two rows of battery modules 20 are arranged in the second direction (Y direction). Therefore, the partition plate 45 between the two battery modules 20 is provided with a partition plate vertical wall 49 extending in the first direction (X direction). Furthermore, the main plate 46 of the partition plate 45 is fixedly supported to the bottom vertical wall 42e.

[0042] Specifically, the partition plate vertical wall 49 has multiple bolt through holes BH1 that penetrate in the third direction (Z direction) and are provided at a predetermined pitch along the first direction (X direction). Multiple screw holes BH2 are provided in the bottom vertical wall 42e at positions opposite to the bolt through holes BH1.

[0043] By fastening bolts B1, which pass through bolt holes BH1 in the partition plate vertical wall 49, to screw holes BH2 in the bottom vertical wall 42e, the main plate 46 of the partition plate 45 is fixedly supported by the bottom vertical wall 42e. By aligning the bottom vertical wall 42e and the partition plate vertical wall 49, deflection of the main plate 46 is suppressed, and the generation of vibrations can be suppressed.

[0044] (Fixing structure of battery module 20) The fixing structure of the battery module 20 will be described below with reference to Figures 2 and 4. The reference numerals shown in Figure 4 mainly indicate the configuration of the third side wall portion 42c (the first end portion 21a of the battery module 20), and the reference numerals in parentheses indicate the configuration of the fourth side wall portion 42d (the second end portion 21b of the battery module 20).

[0045] The battery module 20 includes a first end 21a and a second end 21b located in a first direction (X direction). A first support member 21 is fixed to the first end 21a using bolts B3. The first support member 21 extends in a second direction (Y direction) perpendicular to the first direction (X direction), and both ends of the support member 21 protrude from the end of the battery module 20. A second support member 22 is fixed to the second end 21b. The second support member 22 extends in the second direction (Y direction), and both ends of the support member 22 protrude from the end of the battery module 20.

[0046] (Securing the battery module 20 on the bottom side) The bottom battery module 20 is fixed to the side wall 42 and the bottom vertical wall 42e using a first support member 21 and a second support member 22. Specifically, in the battery module 20 located on the left side in the figure, an 11th auxiliary step 42a11 is provided on the side of the first side wall 42a to the third side wall 42c, and one end of the first support member 21 is fastened and fixed to this 11th auxiliary step 42a11 using a bolt B2. The other end of the first support member 21 is fastened and fixed to the 31st auxiliary step 42e11 of the bottom vertical wall 42e using a bolt B2. Screw holes BH4 are provided in the 11th auxiliary step 42a11 and the 31st auxiliary step 42e11, respectively.

[0047] A 12th auxiliary step portion 42a12 is also provided on the side of the 4th side wall portion 42d of the 1st side wall portion 42a, and one end of the 2nd support member 22 is fastened and fixed to this 12th auxiliary step portion 42a12 using a bolt B2. The other end of the 2nd support member 22 is fastened and fixed to the 32nd auxiliary step portion 42e12 of the bottom vertical wall 42e using a bolt B2. Screw holes BH4 are provided in the 12th auxiliary step portion 42a12 and the 32nd auxiliary step portion 42e12, respectively.

[0048] In the battery module 20 located on the right side of the figure, a 21st auxiliary step portion 42b11 is provided on the side of the second side wall portion 42b to the third side wall portion 42c, and the other end of the first support member 21 is fastened and fixed to this 21st auxiliary step portion 42b11 using a bolt B2. One end of the first support member 21 is fastened and fixed to a 31st auxiliary step portion 42e11 of the bottom vertical wall 42e using a bolt B2. A screw hole BH4 is provided in the 21st auxiliary step portion 42b11.

[0049] A 22nd auxiliary step portion 42b12 is also provided on the side of the 4th side wall portion 42d of the 2nd side wall portion 42b, and the other end of the 2nd support member 22 is fastened and fixed to this 22nd auxiliary step portion 42b12 using bolts B2. One end of the 2nd support member 22 is fastened and fixed to the 32nd auxiliary step portion 42e12 of the bottom vertical wall 42e using bolts B2. A screw hole BH4 is provided in the 22nd auxiliary step portion 42b12.

[0050] The other end of the left-side first support member 21 and the one end of the right-side first support member 21 are connected using a so-called seat joint structure, and the two support members are fastened together to the bottom vertical wall 42e with a single bolt B2 without creating any step difference.

[0051] In the above-described configuration, the configuration for supporting both ends of the first support member 21 and the second support member 22 may be such that they are placed on the upper surfaces of the first main step portion 42a1, the second main step portion 42b1, and the bottom vertical wall 42e.

[0052] (Securing the battery module 20 on the lid side) The battery module 20 on the lid side is fixed to the partition plate 45 using a first support member 21 and a second support member 22. Specifically, in the battery module 20 located on the left side in the figure, a first step portion 47a is provided on the side of the third side wall portion 42c of the first side wall plate 47, and one end of the first support member 21 is fastened and fixed to this first step portion 47a using a bolt B2. A fifth step portion 49a is provided on the side of the third side wall portion 42c of the partition plate vertical wall 49, and the other end of the first support member 21 is fastened and fixed to this fifth step portion 49a using a bolt B2. Screw holes BH4 are provided in the first step portion 47a and the fifth step portion 49a, respectively.

[0053] A second step portion 47b is provided on the side of the fourth side wall portion 42d of the first side wall plate 47, and one end of the second support member 22 is fastened and fixed to this second step portion 47b using a bolt B2. A sixth step portion 49b is provided on the side of the fourth side wall portion 42d of the partition plate vertical wall 49, and the other end of the second support member 22 is fastened and fixed to this sixth step portion 49b using a bolt B2. Screw holes BH4 are provided in the second step portion 47b and the sixth step portion 49b, respectively.

[0054] In the battery module 20 located on the right side of the diagram, a third stage portion 48a is provided on the side of the third side wall portion 42c of the second side wall plate 48, and the other end of the first support member 21 is fastened and fixed to this third stage portion 48a using bolts B2. One end of the first support member 21 is fastened and fixed to the fifth stage portion 49a of the partition plate vertical wall 49 using bolts B2. A screw hole BH4 is provided in the third stage portion 48a.

[0055] A fourth step portion 48b is provided on the side of the fourth side wall portion 42d of the second side wall plate 48, and the other end of the second support member 22 is fastened and fixed to this fourth step portion 48b using bolts B2. One end of the second side wall plate 48 is fastened and fixed to the sixth step portion 49b of the partition plate vertical wall 49 using bolts B2. A screw hole BH4 is provided in the fourth step portion 48b.

[0056] The other end of the left-side first support member 21 and the one end of the right-side first support member 21 are connected using a so-called seat joint structure, and the two support members are fastened together to the partition plate vertical wall 49 with a single bolt B2 without creating any step difference.

[0057] In the above-described configuration, the configuration for supporting both ends of the first support member 21 and the second support member 22 may be such that they are placed on the upper surfaces of the first side wall plate 47, the second side wall plate 48, and the partition plate vertical wall 49.

[0058] By adopting the aforementioned fixing structure for the battery module 20, a gap is created between the battery module 20 located on the bottom side and the bottom 41, making it possible to place the bottom-side cooling member 50 in this gap. Similarly, a gap is created between the battery module 20 located on the lid side and the main plate 46, making it possible to place the partition plate-side cooling member 51 in this gap.

[0059] The battery pack 1 described above employs a configuration in which both ends of the partition plate 45 are fixed to the side wall portion 42 of the case body 43. This configuration makes it possible to effectively utilize the space inside the case 40 and suppress the increase in the size of the case 40.

[0060] In the above configuration, a configuration in which the battery modules 20 are arranged in two rows in the second direction (Y direction) and the battery modules 20 are stacked in two layers in the third direction (Z direction) is shown as an example. However, even if there is one or three or more battery modules 20 arranged in the second direction (Y direction) and the battery modules 20 are stacked in three layers in the third direction (Z direction), the same effects and advantages as in this embodiment can be obtained.

[0061] While embodiments of the present technology have been described above, the embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present technology is defined by the claims, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of symbols]

[0062] 1 Battery pack, 2 Battery cells, 20 Battery module, 21 First support member, 21a First end, 21b Second end, 22 Second support member, 40 Case, 41 Bottom, 42 Side wall, 42a1 First main step, 42a First side wall, 42a12 Twelfth auxiliary step, 42a11 Eleventh auxiliary step, 42b1 Second main step, 42b Second side wall, 42b11 Twelfth auxiliary step, 42b12 Twelfth auxiliary step, 42c Third side wall, 42d Fourth side wall, 42e12 Thirty-second auxiliary step, 42e Bottom vertical wall, 42e11 Thirty-first auxiliary step, 43 Case body, 43a Opening, 44 Lid, 45 Partition plate, 46 Main plate, 47 First side wall plate, 47a 1st stage section, 47b 2nd stage section, 48 2nd side wall plate, 48a 3rd stage section, 48b 4th stage section, 49 partition plate vertical wall, 49a 5th stage section, 49b 6th stage section, 50 bottom side cooling member, 51 partition plate side cooling member.

Claims

1. A battery module including multiple battery cells arranged in a first direction, A case for housing two or more of the aforementioned battery modules, A battery pack equipped with, The case includes a case body having a bottom and side walls surrounding the bottom, a lid covering the opening of the case body, and a partition plate separating the battery module located on the bottom side from the battery module located on the lid side. The partition plate is fixed to the side wall so that one battery module is placed between the partition plate and the bottom, and another battery module is placed between the partition plate and the lid. Battery pack.

2. The side wall portion includes a first side wall portion located in a second direction perpendicular to the first direction and a second side wall portion arranged opposite to the first side wall portion. The first side wall portion is provided with a first main step portion on which one end of the partition plate is placed, and the second side wall portion is provided with a second main step portion on which the other end of the partition plate is placed. The partition plate is positioned to bridge the gap between the first main section and the second main section. The battery pack according to claim 1.

3. The battery module includes a first end and a second end located in the first direction, A first support member is fixed to the first end, extending in a second direction perpendicular to the first direction, with both ends protruding from the end of the battery module. A second support member is fixed to the second end, extending in the second direction and having both ends protruding from the end of the battery module. The battery module on the bottom side, which is positioned between the partition plate and the bottom, has the first support member and the second support member fixed to the side wall. The battery module on the lid side, which is positioned between the partition plate and the lid, has the first support member and the second support member fixed to the partition plate. The battery pack according to claim 1.

4. The side wall portion includes a first side wall portion located in a second direction perpendicular to the first direction and a second side wall portion arranged opposite to the first side wall portion. With respect to the battery module on the bottom side, one end of the first support member and one end of the second support member are fixed to the first side wall, and the other end of the first support member and the other end of the second support member are fixed to the second side wall. The battery pack according to claim 3.

5. On the bottom side, two of the battery modules are arranged in the second direction. A bottom wall extending in the first direction is provided at the bottom between the two battery modules. The other end of the first support member of one of the battery modules is fixed to the bottom vertical wall, and the other end of the first support member of the other battery module is fixed to the bottom vertical wall. The other end of the second support member of one of the battery modules is fixed to the bottom vertical wall, and the other end of the second support member of the other battery module is fixed to the bottom vertical wall. The partition plate is fixedly supported by the bottom vertical wall. The battery pack according to claim 4.

6. The side wall portion includes a first side wall portion located in a second direction perpendicular to the first direction and a second side wall portion arranged opposite to the first side wall portion. The partition plate comprises a main plate arranged parallel to the bottom, a first side wall plate located on the side of the first side wall, and a second side wall plate located on the side of the second side wall. One end of the first support member and one end of the second support member are fixed to the first side wall plate. The other end of the first support member and the other end of the second support member are fixed to the second side wall plate. The battery pack according to claim 3.

7. On the lid side, two of the battery modules are arranged in the second direction. The partition plate between the two battery modules is provided with a partition plate vertical wall extending in the first direction. The other end of the first support member of one of the battery modules is fixed to the partition plate vertical wall, and the other end of the first support member of the other battery module is fixed to the partition plate vertical wall. The other end of the second support member of one of the battery modules is fixed to the partition plate vertical wall, and the other end of the second support member of the other battery module is fixed to the partition plate vertical wall. The battery pack according to claim 6.

8. On the bottom side, two of the battery modules are arranged in the second direction. A bottom wall extending in the first direction is provided at the bottom between the two battery modules. The partition plate wall is fixed to the bottom vertical wall. The battery pack according to claim 7.

9. A bottom-side cooling member is positioned between the battery module and the bottom. A cooling member is positioned between the battery module and the partition plate. The battery pack according to claim 1.

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