Power storage device

Abstract

To provide a power storage device enabling improvement in volumetric efficiency.SOLUTION: A power storage device 10 includes: a first power storage stack 11 including a plurality of power storage cells 100; a second power storage stack 12 including a plurality of power storage cells 100; and a partition wall 240 separating the first and second power storage stacks from each other. The power storage cells 100 each include a cell body 110 and an external terminal 120. The partition wall 240 includes: an upper partition portion 241 located at a higher position than an external terminal; a lower partition portion 242 located at a lower position than the external terminal; and a connecting portion 243 located between a pair of the external terminals 120 adjacent to each other in a second direction, and connecting the upper and lower partition portions to each other. A width of the connecting portion 243 is smaller than a width of the upper partition portion 241 and a width of the lower partition portion 242.SELECTED DRAWING: Figure 4

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 electricity storage device described in JP-A-2022-525014, improvement in volumetric efficiency is desired.

[0005] An object of the present disclosure is to provide an electricity storage device that can improve volumetric efficiency. [Means for solving the problem]

[0006] A storage device according to one aspect of the present disclosure includes a first storage stack including a plurality of storage cells arranged along a first direction; a second storage stack facing the first storage stack in a second direction perpendicular to both the first direction and the vertical direction and including a plurality of storage cells arranged along the first direction; and a partition wall separating the first storage stack and the second storage stack, wherein each of the storage cells includes a cell body and an external terminal protruding from the cell body in the second direction, and the partition wall has an upper partition portion provided at a position higher than the external terminal, a lower partition portion provided at a position lower than the external terminal, and a connecting portion provided between a pair of the external terminals adjacent to each other in the second direction and connecting the upper partition portion and the lower partition portion, and the width of the connecting portion in the second direction is smaller than the width of the upper partition portion in the second direction and the width of the lower partition portion in the second direction. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an electricity storage device that can improve volumetric efficiency. [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 a plan view schematically showing a frame and a partition wall. [Figure 7] FIG. 2 is a cross-sectional view schematically showing the vicinity of a partition wall. 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.

[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 a 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 member 300, 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] As shown in Fig. 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 disposed on the outer side of each end plate 51 in the first direction. As shown in Figs. 4, 5, and 7, restraint bands 53 are connected to the pair of end plates 51. The restraint bands 53 restrain each of the storage stacks 11 to 14 from both sides in the first direction.

[0020] 4 to 6, each energy storage cell 100 has a cell body 110 and a pair of external terminals 120. Note that Fig. 4 shows the energy storage cells 100 included in the first energy storage stack 11 and some of the energy storage cells 100 included in the second energy 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 and 5, a safety valve SV is provided on the lower surface 114a of the cell case 114.

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

[0026] The housing 200 houses four power storage stacks 11 to 14. As shown in Fig. 4 to Fig. 6, the housing 200 has a frame body 210, a top wall 220, a bottom wall 230, and a plurality of (three in this embodiment) partition walls 240. Note that the top wall 220 is not shown in Fig. 6.

[0027] The frame body 210 surrounds the four power storage stacks 11 to 14. The frame body 210 may be formed in a rectangular cylindrical shape. The frame body 210 is formed by aluminum die-casting, for example. As shown in FIGS. 3 to 6 , the frame body 210 has a pair of side walls 212, a pair of connecting walls 214, and a fixing portion 216.

[0028] 4 to 6, each side wall 212 is disposed on the outer side of the plurality of power storage stacks in the second direction. That is, a pair of side walls 212 is disposed at positions sandwiching the four power 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 of the power storage stacks 11 to 14 in the first direction.

[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.

[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 body 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 and 5 , 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. 4, 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 wall 230 is disposed below at least one energy storage cell 100. In this embodiment, the bottom wall 230 is disposed below the four energy storage stacks 11 to 14. The bottom wall 230 is connected to the lower part of the frame body 210. More specifically, the bottom wall 230 is connected to the lower end parts of the side walls 212 and the lower end parts of the connecting walls 214 by adhesive members 350 (see FIGS. 4 and 5). The bottom wall 230 may be fastened to the lower part of the frame body 210 by bolts. The bottom wall 230 is preferably formed in a flat plate shape.

[0035] Each partition wall 240 separates a pair of power storage stacks 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 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 extends downward from the top wall 220. 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.

[0036] As shown in FIGS. 4, 5 and 7, each partition wall 240 has an upper partition portion 241, a lower partition portion 242, and a connecting portion 243.

[0037] The upper partition 241 is provided at a position higher than the external terminals 120. The upper partition 241 is connected to the top wall 220. Specifically, the upper surface of the upper partition 241 is connected to the lower surface of the top portion 222 of the top wall 220 by welding, bonding, fastening, or the like. The upper partition 241 may be formed to be hollow. In this embodiment, the upper partition 241 is formed to be a rectangular tube extending in the first direction. The upper partition 241 is disposed between a pair of restraint bands 53 adjacent to each other in the second direction.

[0038] The lower partition 242 is provided at a position lower than the external terminals 120. The lower partition 242 may be formed to be hollow. In this embodiment, the lower partition 242 is formed to be a rectangular tube extending in the first direction. The lower partition 242 is disposed between a pair of restraint bands 53 adjacent to each other in the second direction.

[0039] The connecting portion 243 connects the upper partition portion 241 and the lower partition portion 242. The connecting portion 243 is provided between a pair of external terminals 120 adjacent to each other in the second direction. The connecting portion 243 is formed in a flat plate shape. The width of the connecting portion 243 in the second direction is smaller than the width of the upper partition portion 241 in the second direction and the width of the lower partition portion 242 in the second direction.

[0040] 5 and 7, the upper partition 241 has an upper facing portion 241s that faces the external terminal 120 in the vertical direction. The lower partition 242 has a lower facing portion 242s that faces the external terminal 120 in the vertical direction. In other words, the upper partition 241 and the lower partition 242 overlap with the external terminal 120 in the vertical direction.

[0041] As shown in FIG. 7, the restraint band 53 has an upper intermediate portion 53a and a lower intermediate portion 53b.

[0042] The upper intervening portion 53a is interposed between each of the power storage stacks 11 to 14 and the upper partition portion 241. The lower intervening portion 53b is interposed between each of the power storage stacks 11 to 14 and the lower partition portion 242. A lower surface 53c of the lower intervening portion 53b may be formed flush with a lower surface 242a of the lower partition portion 242.

[0043] 7, the distance L1 between the upper interposition portion 53a and the upper partition portion 241 is smaller than the distance L2 between the external terminal 120 and the connecting portion 243. Similarly, the distance between the lower interposition portion 53b and the lower partition portion 242 is smaller than the distance L2. The distance between the lower interposition portion 53b and the lower partition portion 242 may be the same as the distance L1 between the upper interposition portion 53a and the upper partition portion 241.

[0044] The support member 300 supports the lower surfaces 114a of the ends of a pair of energy storage cells 100 adjacent to each other in the second direction. The support member 300 is connected to the lower partition portion 242 of the partition wall 240. As shown in Fig. 5, the energy storage device 10 in this embodiment includes five support members 300 arranged at intervals from each other in the second direction. Each support member 300 has a support member body 310 and an adhesive member 320.

[0045] The support member 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 member body 310 has a shape that exposes downward a portion of the lower surface 114a of the cell case 114 other than the portion that overlaps in the up-down direction with the support member body 310 (a portion including the safety valve SV). In other words, the portion of the lower surface 114a of the cell case 114 that does not overlap in the up-down direction with the support member body 310 is exposed downward. The support member body 310 extends in the first direction. The support member body 310 may be formed by extrusion molding of a metal such as aluminum.

[0046] Each of the three support member bodies 310 arranged in the center in the second direction is fastened by a bolt B2 to the lower end of the lower partition 242. Each of the pair of support member bodies 310 arranged on the outer sides in the second direction is fastened by a bolt B2 to the lower part of the side wall 212. As shown in Figures 4 and 5, a notch 212s for receiving the support member body 310 is formed in the lower part of each side wall 212.

[0047] The support member body 310 has a lower surface 310a formed flush with the lower surfaces 212a of each side wall 212. The lower surface 310a of the support member body 310 is connected to the bottom wall 230 by an adhesive member 350. Note that in Fig. 6, an imaginary plane L including the lower surfaces 212a of the side walls 212 and the lower surface 310a of the support member body 310 is indicated by a two-dot chain line.

[0048] The adhesive member 320 adheres the end of the support member body 310 in the second direction to the lower surface 114a of the energy storage cell 100.

[0049] 4, a pair of support members 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 wall 230. The pair of support members 300, together with the energy storage cells 100 and the bottom wall 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.

[0050] 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.

[0051] 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.

[0052] 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 4, 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.

[0053] 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. 4) 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).

[0054] 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, 4, and 5.

[0055] 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.

[0056] The junction box 812 is disposed above the top wall 220. The junction box 812 houses a relay, a fuse, and the like.

[0057] 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.

[0058] 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.

[0059] The electronic control unit 816 is disposed above the junction box 812 .

[0060] The equipment cover 830 houses the junction box 812 , the power supply unit 814 , the electronic control unit 816 , and the unit cooler 824 .

[0061] 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.

[0062] Furthermore, in this energy storage device 10, the width of the connecting portion 243 provided between a pair of external terminals 120 is smaller than the width of the upper partition portion 241 and the width of the lower partition portion 242, so that it is possible to arrange each energy storage stack 11 to 14 close to each other, i.e., to improve the volumetric efficiency of the energy storage device 10.

[0063] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0064] [Aspect 1] a first storage stack including a plurality of storage cells arranged along a first direction; a second power storage stack facing the first power storage stack in a second direction perpendicular to both the first direction and the up-and-down direction and including a plurality of power storage cells arranged along the first direction; a partition wall that separates the first power storage stack and the second power storage stack, Each of the storage cells is A cell body; an external terminal protruding from the cell body in the second direction; The partition wall is an upper partition portion provided at a position higher than the external terminals; a lower partition portion provided at a position lower than the external terminals; a connecting portion provided between a pair of the external terminals adjacent to each other in the second direction and connecting the upper partition portion and the lower partition portion, The width of the connecting portion in the second direction is smaller than the width of the upper partition portion in the second direction and the width of the lower partition portion in the second direction.

[0065] In this energy storage device, the width of the connecting portion provided between a pair of external terminals is smaller than the width of the upper partition portion and the width of the lower partition portion, so that the first energy storage stack and the second energy storage stack can be arranged close to each other, i.e., the volumetric efficiency of the energy storage device can be improved.

[0066] [Aspect 2] the upper partition portion has an upper opposing portion that faces the external terminal in the vertical direction, 2. The power storage device according to aspect 1, wherein the lower partition has a lower opposing portion that faces the external terminal in the up-down direction.

[0067] In this embodiment, the overall length of the first power storage stack and the second power storage stack in the second direction is reduced.

[0068] [Aspect 3] an upper interposition portion interposed between each of the first and second power storage stacks and the upper partition portion; a lower interposition portion interposed between each of the first power storage stack and the second power storage stack and the lower partition portion, The energy storage device of aspect 2, wherein at least one of the distance between the upper interposition portion and the upper partition portion and the distance between the lower interposition portion and the lower partition portion is smaller than the distance between the external terminal and the connecting portion.

[0069] In this aspect, when the first and second storage stacks move toward each other due to vibration or the like, the upper intervening portion and the upper partition portion, or the lower intervening portion and the lower partition portion, come into contact with each other before the external terminals come into contact with the connecting portion, thereby suppressing damage to the external terminals or the occurrence of short circuits.

[0070] [Aspect 4] a top wall provided above the first power storage stack and the second power storage stack; a bottom wall disposed below the first power storage stack and the second power storage stack; a support member connected to the partition wall and supporting a lower surface of the first power storage stack and the second power storage stack, The upper partition is connected to the top wall, The support member is connected to the lower partition, 4. The power storage device according to any one of aspects 1 to 3, wherein the bottom wall is connected to the support member.

[0071] In this aspect, since the partition wall and the support member are interposed between the top wall and the bottom wall, for example, when a downward load acts on the top wall from above, the load is received by the bottom wall via the partition wall and the support member, thereby suppressing input of the load to the energy storage cells and resulting damage to the energy storage cells.

[0072] 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]

[0073] REFERENCE SIGNS LIST 1 vehicle, 2 vehicle body, 10 energy storage device, 11 to 14 energy storage stack, 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, 53 restraint band, 53a upper intermediate portion, 53b lower intermediate portion, 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, 212a lower surface, 212s notch, 214 connecting wall, 216 fixing portion, 220 top wall, 222 top portion, 224 recess, 226 lower element, 226a groove, 228 upper element, 230 Bottom wall, 240 partition wall, 241 upper partition portion, 241s upper opposing portion, 242 lower partition portion, 242s lower opposing portion, 243 connecting portion, 290 explosion-proof valve, 300 support member, 310 support member main body, 310a lower surface, 320 adhesive member, 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 path), SV safety valve.

Claims

1. a first storage stack including a plurality of storage cells arranged along a first direction; a second power storage stack facing the first power storage stack in a second direction perpendicular to both the first direction and the up-and-down direction and including a plurality of power storage cells arranged along the first direction; a partition wall that separates the first power storage stack and the second power storage stack, Each of the storage cells is A cell body; an external terminal protruding from the cell body in the second direction; The partition wall is an upper partition portion provided at a position higher than the external terminals; a lower partition portion provided at a position lower than the external terminals; a connecting portion provided between a pair of the external terminals adjacent to each other in the second direction and connecting the upper partition portion and the lower partition portion, a width of the connecting portion in the second direction being smaller than a width of the upper partition portion in the second direction and a width of the lower partition portion in the second direction;

2. the upper partition portion has an upper opposing portion that faces the external terminal in the vertical direction, The power storage device according to claim 1 , wherein the lower partition portion has a lower opposing portion that faces the external terminal in the vertical direction.

3. an upper interposition portion interposed between each of the first and second power storage stacks and the upper partition portion; a lower interposition portion interposed between each of the first power storage stack and the second power storage stack and the lower partition portion, 3. The energy storage device according to claim 2, wherein at least one of a distance between the upper interposition portion and the upper partition portion and a distance between the lower interposition portion and the lower partition portion is smaller than a distance between the external terminal and the connecting portion.

4. a top wall provided above the first power storage stack and the second power storage stack; a bottom wall disposed below the first power storage stack and the second power storage stack; a support member connected to the partition wall and supporting a lower surface of the first power storage stack and the second power storage stack, The upper partition is connected to the top wall, The support member is connected to the lower partition, The power storage device according to claim 1 , wherein the bottom wall is connected to the support member.

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