Electric power storage device

Abstract

To provide an electric power storage device that allows easy attachment and detachment of a bottom plate.SOLUTION: An electric power storage device 10 includes: at least one power storage cell 100; a top wall 220 provided above the power storage cell; opposing walls 212, 240 facing the power storage cell in a width direction; a support portion 300 supporting the power storage cell; and a bottom plate 230 disposed below the power storage cell. The bottom plate 230 has a flatly formed connection surface 231a. At least one of the opposing wall and the support portion is formed at a position closest to the connection surface 231a of the bottom plate 230 and has flatly formed bottom surfaces 212a, 310a. The connection surface 231a of the bottom plate 230 is connected to the bottom surface.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] For example, JP 2022-525014 A discloses a power battery pack including a plurality of cells and a housing device. An external terminal and an explosion-proof valve are provided on the side of the case of each cell. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2022-525014 Summary of the Invention [Problem to be solved by the invention]

[0004] In the power battery pack described in JP-A-2022-525014, it is difficult to attach and detach (replace) the bottom of the storage device.

[0005] An object of the present disclosure is to provide an electricity storage device that allows for simple attachment and detachment of a bottom plate. [Means for solving the problem]

[0006] A storage device according to one aspect of the present disclosure includes at least one storage cell, a top wall provided above the at least one storage cell, an opposing wall facing the at least one storage cell in a width direction perpendicular to both the thickness direction and the up-down direction of the at least one storage cell, a support portion connected to the opposing wall and supporting the at least one storage cell, and a bottom plate arranged below the at least one storage cell, wherein the bottom plate has a flat connection surface, and at least one of the opposing wall and the support portion is formed at a position closest to the connection surface of the bottom plate and has a flat bottom surface, and the connection surface of the bottom plate is connected to the bottom surface. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an electricity storage device in which the bottom plate can be easily attached and detached. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram schematically illustrating a vehicle including a power storage device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view schematically showing the power storage device and a frame member. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. [Figure 6] FIG. 2 is an enlarged cross-sectional view of the electricity storage device. [Figure 7] FIG. 2 is a plan view schematically showing a frame and a partition wall. [Figure 8] 10A and 10B are cross-sectional views schematically showing modified examples of the opposing wall and the support portion. [Figure 9] 10A and 10B are cross-sectional views schematically showing modified examples of the opposing wall and the support portion. [Figure 10] 10A and 10B are cross-sectional views schematically showing modified examples of the opposing wall and the support portion. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0010] Fig. 1 is a diagram schematically showing a vehicle including a power storage device according to an embodiment of the present disclosure. Fig. 2 is a perspective view schematically showing the power storage device and a frame member. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. Fig. 5 is an exploded cross-sectional view of the power storage device. Fig. 6 is an enlarged cross-sectional view of the power storage device.

[0011] 1, a vehicle 1 includes a vehicle body 2 and a power storage device 10. Examples of the vehicle 1 include a hybrid electric vehicle, a plug-in hybrid electric vehicle, and an electric vehicle (battery electric vehicle).

[0012] 1 and 2, the vehicle body 2 includes a frame member 20, a front component member 31, and a rear component member 32. The frame member 20 is disposed at the bottom of the vehicle body 2. The frame member 20 has a pair of first frames 21, a pair of second frames 22, and a cross frame 23.

[0013] The pair of first frames 21 face each other in a first direction. The first direction may be a direction parallel to the longitudinal direction of the vehicle 1. In the example shown in FIG. 2, the first frame 21 disposed at the front has a shape extending along a second direction perpendicular to both the first direction and the up-down direction. The first frame 21 disposed at the rear has a shape extending in the second direction and convex rearward. The second direction may be a direction parallel to the left-right direction (width direction) of the vehicle 1.

[0014] The pair of second frames 22 face each other in the second direction. Each second frame 22 has a shape extending along the first direction. An end of each second frame 22 in the first direction is connected to the first frame 21. The pair of second frames 22, together with the pair of first frames 21, are formed in a substantially rectangular tubular shape that surrounds the power storage device 10.

[0015] The cross frame 23 is disposed between the pair of first frames 21 and connects the pair of second frames 22. The cross frame 23 constitutes, for example, a seat cross. A spacer 23a is disposed on the underside of the cross frame 23.

[0016] The front component member 31 is connected to a front portion of the frame member 20. The rear component member 32 is connected to a rear portion of the frame member 20. Each of the component members 31, 32 may be formed by aluminum die casting.

[0017] The power storage device 10 is attached to a frame member 20. As shown in Figs. 2 to 6, the power storage device 10 is disposed below the cross frame 23. As shown in Figs. 1 to 6, the power storage device 10 includes four power storage stacks 11 to 14, a housing 200, a support portion 300, an adhesive member 350, a cooler 500, and an equipment unit 800. The number of power storage stacks is not limited to four. The equipment unit 800 is not shown in Fig. 2.

[0018] Each of the power storage stacks 11 to 14 includes at least one power storage cell 100. In this embodiment, each of the power storage stacks 11 to 14 includes a power storage cell group including a plurality of (for example, 50) power storage cells 100 arranged side by side along the first direction. Each of the power storage stacks 11 to 14 may further include a plurality of spacers. Each spacer is arranged between a pair of adjacent power storage cells 100 in the power storage cell group. Each of the power storage stacks 11 to 14 is formed in the shape of a rectangular parallelepiped that is long in the first direction. As shown in FIG. 2, the four power storage stacks 11 to 14 are arranged side by side along the second direction.

[0019] 3, a pair of end plates 51 are provided on both sides of the plurality of storage cells 100 in the first direction to sandwich the plurality of storage cells 100 from both sides in the first direction. A monitoring unit (Smart Battery Management) 52 is arranged on the outside of each end plate 51 in the first direction.

[0020] 4 to 6, each storage cell 100 has a cell body 110 and a pair of external terminals 120. Note that Fig. 6 shows the storage cells 100 included in the first storage cell group 11A of the first storage stack 11 and some of the storage cells 100 included in the second storage cell group 12A of the second storage stack 12.

[0021] The cell body 110 has an electrode assembly 112 and a cell case 114. The thickness direction of the cell body 110 corresponds to the first direction. The width direction of the cell body 110 (the direction perpendicular to both the thickness direction and the up-down direction) corresponds to the second direction.

[0022] The electrode assembly 112 may be formed as a wound body in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween, or may be formed as a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The electrode assembly 112 is formed in a shape that is long in the second direction.

[0023] The cell case 114 houses the electrode assembly 112. The cell case 114 is formed in a rectangular parallelepiped shape and is made of a metal such as aluminum.

[0024] As shown in FIGS. 4 to 6, the cell case 114 has a lower surface 114a provided with a safety valve SV.

[0025] Each external terminal 120 protrudes in the second direction from a side surface 114b of the cell casing 114 in the second direction. One of the pair of external terminals 120 protrudes from one side surface 114b of the cell casing 114 in the second direction. The other of the pair of external terminals 120 protrudes from the other side surface 114b of the cell casing 114 in the second direction.

[0026] The housing 200 houses four power storage stacks 11 to 14. As shown in Fig. 4 to Fig. 7, the housing 200 has a frame body 210, a top wall 220, a bottom plate 230, and a plurality of (three in this embodiment) partition walls 240. Note that the top wall 220 is not shown in Fig. 7.

[0027] The frame body 210 surrounds the four power storage stacks 11 to 14. The frame body 210 may be formed in a rectangular tubular shape. The frame body 210 is formed by, for example, aluminum die-casting. As shown in FIGS. 3 to 7 , the frame body 210 has a pair of side walls 212, a pair of connecting walls 214, and a fixing portion 216.

[0028] 4 and 7, each side wall 212 is disposed outside the plurality of energy storage cell groups in the second direction. That is, a pair of side walls 212 is disposed at positions sandwiching the four energy storage stacks 11 to 14 in the second direction. Each side wall 212 extends along the first direction. The length of each side wall 212 in the first direction is longer than the length of each energy storage stack 11 to 14 in the first direction. Each side wall 212 has a lower surface 212a that is formed flat.

[0029] A pair of connecting walls 214 are provided on both sides of at least one energy storage cell 100 in the first direction (thickness direction). Each connecting wall 214 connects a pair of side walls 212 to each other. In this embodiment, the connecting wall 214 arranged on one side in the first direction (the front side in the longitudinal direction of the vehicle) connects one end (front end) of each side wall 212 in the first direction to each other. The connecting wall 214 arranged on the other side in the first direction (the rear side in the longitudinal direction of the vehicle) connects the other end (rear end) of each side wall 212 in the first direction to each other. The lower surface of each connecting wall 214 is formed flat.

[0030] The fixing portion 216 is a portion that is connected to the frame member 20. The fixing portion 216 has a shape that protrudes outward from the outer surface of the first frame 21 and the outer surface of the second frame 22. The fixing portion 216 is fastened to each of the frames 21, 22 from below with a bolt B1.

[0031] The top wall 220 is provided above at least one energy storage cell 100. In this embodiment, the top wall 220 is provided above the four energy storage stacks 11 to 14. The top wall 220 covers the four energy storage stacks 11 to 14. The top wall 220 is connected to the upper end of the frame 210. Specifically, the top wall 220 is connected to the upper end of each side wall 212 and the upper end of each connecting wall 214 by welding or the like. As shown in FIGS. 4 to 6 , the top wall 220 has a top portion 222 and four recesses 224.

[0032] The top portion 222 is formed flat. The top portion 222 overlaps with the ends of each power storage stack in the second direction in the up-down direction. A spacer 23a is provided between the top portion 222 and the cross frame 23.

[0033] Each recess 224 is recessed downward from the top portion 222. Each recess 224 is formed flat. Each recess 224 is formed above the center of each energy storage stack 11 to 14 in the second direction. As shown in FIG. 6, the length of each recess 224 in the second direction is shorter than the length of the energy storage cell 100 in the second direction. Each recess 224 is in contact with the upper surface of the cell casing 114 via a thermally conductive adhesive 910.

[0034] The bottom plate 230 is disposed below at least one energy storage cell 100. In this embodiment, the bottom plate 230 is disposed below the four energy storage stacks 11 to 14. The bottom plate 230 is connected to the lower part of the frame body 210. The bottom plate 230 may be fastened to the lower part of the frame body 210 by bolts.

[0035] The bottom plate 230 has an upper surface 231 and a lower surface 232. The upper surface 231 includes a connecting surface 231a that is formed flat. The upper surface 231, including the connecting surface 231a, is formed flat. The lower surface 232 is also formed flat. In other words, the bottom plate 230 is formed in a flat plate shape.

[0036] The adhesive members 350 are disposed between the frame 210 and the bottom plate 230. The adhesive members 350 are provided between the lower surfaces 212a of the side walls 212 and the lower surfaces of the connecting walls 214 and the upper surface 231 of the bottom plate 230.

[0037] Each partition wall 240 separates a pair of storage cell groups facing each other in the second direction. Each partition wall 240 is disposed between a pair of external terminals 120 facing each other in the second direction. Each partition wall 240 extends downward from the top wall 220. An upper end of the partition wall 240 is connected to the lower surface of the top portion 222 of the top wall 220 by welding, bonding, fastening, or the like. Each partition wall 240 extends in the first direction. An end of each partition wall 240 in the first direction may be connected to the connecting wall 214 of the frame body 210 or may be spaced apart from the connecting wall 214. Each partition wall 240 is connected to the cross frame 23 via the top wall 220 and a spacer 23a. Each partition wall 240 may be formed by extrusion molding of a metal such as aluminum.

[0038] Each partition wall 240 and each side wall 212 constitutes an "opposing wall" that faces the energy storage cell 100 in the second direction (width direction). In other words, each partition wall 240 and each side wall 212 is an example of an "opposing wall" in the present disclosure.

[0039] The support portion 300 supports at least one energy storage cell 100. The support portion 300 supports the lower surfaces 114a of both ends of the energy storage cell 100 in the second direction. The support portion 300 supports four energy storage stacks 11 to 14. The support portion 300 is connected to the opposing walls. As shown in FIGS. 4 and 5, the energy storage device 10 in this embodiment includes five support portions 300 arranged at intervals from each other in the second direction. Each support portion 300 has a support portion main body 310 and an adhesive member 320.

[0040] The support body 310 is disposed at a position where it overlaps in the up-down direction with each end of a pair of energy storage cells 100 that face each other in the second direction. The support body 310 has a shape that exposes downward a portion of the lower surface 114a of the cell casing 114 other than a portion that overlaps in the up-down direction with the support body 310 (a portion including the safety valve SV). In other words, a portion of the lower surface 114a of the cell casing 114 that does not overlap in the up-down direction with the support body 310 is exposed downward. The support body 310 extends in the first direction. The support body 310 may be formed by extrusion molding of a metal such as aluminum.

[0041] 5 and 6, the support body 310 has a flat lower surface 310a. In this embodiment, this lower surface 310a is formed flush with the lower surfaces 212a of the side walls 212. In addition, in FIGS. 4 and 6, an imaginary plane L including the lower surfaces 212a of the side walls 212 and the lower surface 310a of the support body 310 is shown by a two-dot chain line.

[0042] Each of the three support body bodies 310 arranged in the center in the second direction is fastened to the lower end of the partition wall 240 by a bolt B2. Each of the pair of support body bodies 310 arranged on the outer sides in the second direction is fastened to the lower part of the side wall 212 by a bolt B2. As shown in FIGS. 5 and 6, a notch 212s that receives the support body 310 is formed in the lower part of each side wall 212. The support body 310 is positioned within the notch 212s.

[0043] The adhesive member 320 adheres the end of the support portion main body 310 in the second direction to the lower surface 114a of the energy storage cell 100.

[0044] At least one of the opposing wall and the support part 300 is formed at a position closest to the connection surface 231a of the bottom plate 230 and has a flat bottom surface. In this embodiment, the bottom surface is formed by both the lower surface 212a of each side wall 212 and the lower surface 310a of the support part main body 310. The connection surface 231a of the bottom plate 230 is connected to the bottom surface by an adhesive member 350. Note that "the position closest to the connection surface 231a of the bottom plate 230" means the position at which the length from the connection surface 231a of the bottom plate 230 along the direction perpendicular to the connection surface 231a is the shortest.

[0045] 6, a pair of support portions 300 adjacent to each other in the second direction are in contact with the lower surfaces 114a of the ends of the energy storage cells 100 in the second direction and the bottom plate 230. The pair of support portions 300, together with the energy storage cells 100 and the bottom plate 230, define spaces S below each of the energy storage stacks 11 to 14. That is, in this embodiment, four spaces S are formed inside the housing 200.

[0046] As shown in Fig. 3, each space S extends in a first direction. Each space S functions as a smoke exhaust path (hereinafter referred to as a "smoke exhaust path S"). The smoke exhaust path S is a path for discharging gas discharged from the safety valve SV of the energy storage cell 100 to the outside of the casing 200. Each smoke exhaust path S is connected to a common space within the casing 200 at an end of the smoke exhaust path S in the first direction.

[0047] As shown in FIG. 3, an explosion-proof valve 290 is provided in a portion of the connecting wall 214 that faces the smoke exhaust path S in the first direction. The explosion-proof valve 290 is provided in the common space within the housing 200. The explosion-proof valve 290 releases pressure within the housing 200. The explosion-proof valve 290 opens when the pressure within the housing 200 reaches or exceeds a reference value. The explosion-proof valve 290 is configured as a check valve. As shown in FIG. 3, when gas is exhausted from any of the energy storage cells 100, the gas spreads in the first direction through the smoke exhaust path S and is exhausted to the outside of the housing 200 through the explosion-proof valve 290.

[0048] The cooler 500 cools at least one energy storage cell 100. A cooling medium (water, etc.) flows through the cooler 500. As shown in FIGS. 2 to 6, the cooler 500 is provided on the top wall 220. More specifically, the cooler 500 is disposed in the recess 224 of the top wall 220.

[0049] The cooler 500 is in thermal contact with at least one energy storage cell 100 via the top wall 220. In this embodiment, a thermally conductive adhesive 910 (see FIG. 6) extending along the first direction is provided between the cooler 500 and the recess 224. That is, in this embodiment, the cooler 500 is in thermal contact with each of the energy storage stacks 11 to 14 via the top wall 220 and the thermally conductive adhesive 910. Note that being in thermal contact includes a case in which the cooler 500 is in contact with the energy storage cell 100 only via the top wall 220, and a case in which the cooler 500 is in indirect contact with the energy storage cell 100 via a thermally conductive member (such as an adhesive or a fixing member).

[0050] The cooler 500 forms at least a part of the floor 30 of the vehicle compartment (see FIG. 3). In addition to the cooler 500, the floor 30 of the vehicle compartment may include floor components (covering members, buffer members, carpet, etc.) placed on the cooler 500. Note that illustration of the floor components is omitted in FIGS. 2 and 4 to 6.

[0051] The equipment unit 800 is disposed, for example, at an end in the first direction. In this embodiment, the equipment unit 800 is disposed on the rear part of the top wall 220 in the longitudinal direction of the vehicle 1. The equipment unit 800 has a junction box 812, an electricity supply unit 814, an electronic control unit 816, a unit cooler 824, and an equipment cover 830.

[0052] The junction box 812 is disposed above the top wall 220. The junction box 812 houses a relay, a fuse, and the like.

[0053] 3, the cooler 500 has an interposed portion 518 interposed between the top wall 220 and the junction box 812. The junction box 812 is cooled by the interposed portion 518.

[0054] The power supply unit 814 is disposed above the junction box 812. The power supply unit 814 is cooled by a unit cooler 824 disposed above the power supply unit 814.

[0055] The electronic control unit 816 is disposed above the junction box 812 .

[0056] The equipment cover 830 houses the junction box 812 , the power supply unit 814 , the electronic control unit 816 , and the unit cooler 824 .

[0057] In the energy storage device 10 described above, when gas is discharged downward from the safety valve SV due to a short circuit or the like in any of the energy storage cells 100, the gas flows into the smoke exhaust path S. The gas that flows into the smoke exhaust path S then spreads in a first direction and is discharged from the housing 200 through the explosion-proof valve 290 as shown in FIG. 3. This prevents the contents of the energy storage cells 100 (so-called debris) contained in the gas from adhering to the external terminals 120 of the energy storage cells 100, etc.

[0058] Furthermore, in this energy storage device 10, the bottom surface of at least one of the opposing walls (side wall 212 and partition wall 240) and support portion 300 and the connecting surface 231a of the bottom plate 230 are both formed flat, which makes it easy to attach and detach the bottom plate 230 to and from the bottom surface. Therefore, if the bottom plate 230 is damaged, it can be easily replaced.

[0059] Additionally, in the above embodiment, since both the bottom surface and the upper surface 231 of the bottom plate 230 are formed flat, the adhesive member 350 can be cut by moving a member capable of cutting the adhesive member 350 (such as a wire rod or a blade made of high-tensile steel) between the bottom surface and the upper surface 231 of the bottom plate 230 in the second direction. This makes it possible to remove the bottom plate 230.

[0060] Modifications of the above embodiment will now be described.

[0061] <First Modification> 8, the support body 310 may be connected to the lower surface 212a of the side wall 212. The support body 310 is connected to the lower surface 212a of the side wall 212 by, for example, a bolt B2. In this example, the bottom surface, i.e., the surface formed closest to the upper surface 231 of the bottom plate 230 and formed flat, is made up of the lower surface 310a of the support body 310.

[0062] <Second Modification> 9, the support body 310 may be integrally formed from the same material as the side wall 212. The side wall 212 and the support body 310 are formed, for example, by aluminum die-casting. In this example, the bottom surface, i.e., the surface closest to the upper surface 231 of the bottom plate 230, is formed as a flat surface consisting of both the lower surface 212a of the side wall 212 and the lower surface 310a of the support body 310.

[0063] <Third Modification> 10, the support body 310 may be connected to a portion of the side wall 212 that is higher than the lower surface 212a. The side wall 212 and the support body 310 are formed by, for example, aluminum die-casting. In this example, the support body 310 is formed at a position closest to the bottom surface, i.e., the upper surface 231 of the bottom plate 230, and the flat surface is formed by the lower surface 212a of the side wall 212, not the lower surface 310a of the support body 310. The lower surface 310a of the support body 310 is formed higher than the lower surface 212a of the side wall 212 that forms the bottom surface.

[0064] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0065] [Aspect 1] at least one storage cell; a top wall provided above the at least one energy storage cell; an opposing wall opposing the at least one storage cell in a width direction perpendicular to both a thickness direction and a vertical direction of the at least one storage cell; a support portion connected to the opposing wall and supporting the at least one energy storage cell; a bottom plate disposed below the at least one storage cell; The bottom plate has a flat upper surface, At least one of the opposing wall and the support portion is formed at a position closest to the top surface of the bottom plate and has a flat bottom surface, The bottom plate is connected to the bottom surface of the power storage device.

[0066] In this energy storage device, the bottom surface of at least one of the opposing wall and the support portion and the top surface of the bottom plate are both flat, which makes it easy to attach and detach the bottom plate to and from the bottom plate, and therefore makes it easy to replace the bottom plate if it is damaged.

[0067] [Aspect 2] Both the opposing wall and the support portion have the bottom surface, the opposing wall has a notch for receiving the support portion, 2. The power storage device according to claim 1, wherein the support portion is located within the notch.

[0068] [Aspect 3] The support portion is connected to a lower surface of the opposing wall, 2. The power storage device according to claim 1, wherein the bottom surface is formed by a lower surface of the support portion.

[0069] [Aspect 4] The opposing wall has the bottom surface, 2. The power storage device according to claim 1, wherein the support portion has a lower surface formed above the bottom surface.

[0070] [Aspect 5] 5. The power storage device according to any one of aspects 1 to 4, wherein the bottom plate has a flat lower surface.

[0071] In this manner, air resistance while the vehicle is running is reduced.

[0072] [Aspect 6] 6. The power storage device of any one of aspects 1 to 5, further comprising an adhesive member provided between the bottom surface and the connection surface of the bottom plate.

[0073] In this embodiment, since the bottom surface and the upper surface of the bottom plate are formed flat, the adhesive member can be cut by moving a member capable of cutting the adhesive member (such as a wire rod or a blade made of high-tensile steel) between the bottom surface and the upper surface of the bottom plate in the second direction, thereby making it possible to remove the bottom plate.

[0074] [Aspect 7] the bottom plate has an upper surface including the connection surface, 7. The power storage device according to any one of aspects 1 to 6, wherein the upper surface is formed flat.

[0075] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present disclosure is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0076] REFERENCE SIGNS LIST 1 vehicle, 2 vehicle body, 10 energy storage device, 11 to 14 energy storage stack, 11A first energy storage cell group, 12A second energy storage cell group, 20 frame member, 21 first frame, 22 second frame, 23 cross frame, 30 floor portion, 31 front component member, 32 rear component member, 51 end plate, 52 monitoring unit, 100 energy storage cell, 110 cell body, 112 electrode body, 114 cell case, 114a lower surface, 120 external terminal, 200 housing, 210 frame body, 212 side wall (opposing wall), 212a lower surface (bottom surface), 212s notch, 214 connecting wall, 216 fixing portion, 220 top wall, 222 top portion, 224 recessed portion, 230 bottom plate, 231 upper surface, 231a Connection surface, 232 underside, 240 partition wall (opposing wall), 290 explosion-proof valve, 300 support part, 310 support part body, 310a underside (bottom), 320 adhesive material, 500 cooler, 800 equipment unit, 812 junction box, 814 power supply unit, 816 electronic control unit, 824 unit cooler, 830 equipment cover, 910 thermally conductive adhesive, S space (smoke exhaust route), SV safety valve.

Claims

1. at least one storage cell; a top wall provided above the at least one storage cell; an opposing wall opposing the at least one storage cell in a width direction perpendicular to both a thickness direction and a vertical direction of the at least one storage cell; a support portion connected to the opposing wall and supporting the at least one energy storage cell; a bottom plate disposed below the at least one storage cell; The bottom plate has a flat connecting surface, At least one of the opposing wall and the support portion is formed at a position closest to the connection surface of the bottom plate and has a flat bottom surface, The connection surface of the bottom plate is connected to the bottom surface.

2. Both the opposing wall and the support portion have the bottom surface, the opposing wall has a notch for receiving the support portion, The power storage device according to claim 1 , wherein the support portion is located within the notch.

3. The support portion is connected to a lower surface of the opposing wall, The power storage device according to claim 1 , wherein the bottom surface is formed by a lower surface of the support portion.

4. The opposing wall has the bottom surface, The power storage device according to claim 1 , wherein the support portion has a lower surface formed above the bottom surface.

5. The power storage device according to claim 1 , wherein the bottom plate has a lower surface that is formed flat.

6. The power storage device according to claim 1 , further comprising an adhesive member provided between the bottom surface and the connecting surface of the bottom plate.

7. the bottom plate has an upper surface including the connection surface, The power storage device according to claim 1 , wherein the upper surface is formed flat.

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