Power storage device

Abstract

Provided is an electricity storage device capable of suppressing heat transfer between adjacent electricity storage cells. [Solution] The energy storage device (10) includes a plurality of energy storage cells (100), a first heat conduction member (151), a second heat conduction member (152), a first connection member (161), and a second connection member (162). The first heat conduction member (151) faces a portion of a valve installation surface (114a) on one side of a safety valve (SV) in a second direction, and the second heat conduction member (152) faces a portion of the valve installation surface (114a) on the other side of the safety valve (SV) in the second direction. The first connection member (161) is provided between the first heat conduction member and the valve installation surface of each odd-numbered energy storage cell from the one-end energy storage cell (101) to the other-end energy storage cell (102). The second connection member (162) is provided between the second heat conduction member and the valve installation surface of each even-numbered energy storage cell from the one-end energy storage cell (101) to the other-end energy storage cell (102).

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, there is room for improvement in resistance to heat transfer between adjacent electricity storage cells.

[0005] An object of the present disclosure is to provide an electricity storage device that can suppress heat transfer between adjacent electricity storage cells. [Means for solving the problem]

[0006] An energy storage device according to one aspect of the present disclosure includes: a plurality of energy storage cells arranged to be aligned along a first direction; a first heat conducting member having a shape extending from a one-end side energy storage cell arranged at one end in the first direction among the plurality of energy storage cells to an other-end side energy storage cell arranged at the other end in the first direction among the plurality of energy storage cells; a second heat conducting member having a shape extending from the one-end side energy storage cell to the other-end side energy storage cell; a first connection member connecting the first heat conducting member to the plurality of energy storage cells; and a second connection member connecting the second heat conducting member to the plurality of energy storage cells, wherein each of the energy storage cells has a cell case including a valve installation surface on which a safety valve is provided, The first heat conduction member faces a portion of the valve installation surface on one side of the safety valve in a second direction perpendicular to both the first direction and the up-and-down direction, the second heat conduction member faces a portion of the valve installation surface on the other side of the safety valve in the second direction, the first connection member is provided between the first heat conduction member and the valve installation surface of each of the plurality of storage cells that are arranged in odd numbers from the one-end side storage cell to the other-end side storage cell, and the second connection member is provided between the second heat conduction member and the valve installation surface of each of the plurality of storage cells that are arranged in even numbers from the one-end side storage cell to the other-end side storage cell. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an electricity storage device that is capable of suppressing heat transfer between adjacent electricity storage cells. [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, a frame member, a front component member, and a rear component 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. 2 is a bottom view of the electricity storage stack and each heat conduction member. [Figure 6] 10A and 10B are bottom views of modified examples of the electricity storage stack and the heat conduction members. 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 illustrating a vehicle including a power storage device according to an embodiment of the present disclosure. Fig. 2 is a perspective view schematically illustrating the power storage device, a frame member, and a vehicle frame. 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.

[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 forms, for example, a seat cross.

[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 and 3, the power storage device 10 is disposed below a cross frame 23. As shown in FIGS. 1 to 4, the power storage device 10 includes four power storage stacks 11 to 14, a first heat conduction member 151, a second heat conduction member 152, a first connection member 161, a second connection member 162, a housing 200, a structural member 300, a reinforcing portion 400, a cooler 500, and a covering member 600. The number of power storage stacks is not limited to four. The covering member 600 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 (e.g., 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 105 (see FIG. 5). Each spacer 105 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] As shown in Fig. 4, each storage cell 100 has a cell body 110 and a pair of external terminals 120. Note that Fig. 4 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. The cell case 114 is made of a metal such as aluminum. The cell case 114 includes a valve mounting surface 114a and a terminal mounting surface 114b.

[0024] A safety valve SV is provided on the valve installation surface 114a. In this embodiment, the valve installation surface 114a is configured on the lower surface of the cell casing 114. However, the valve installation surface 114a may also be configured on the upper surface of the cell casing 114.

[0025] External terminals 120 are provided on the terminal installation surface 114b. In this embodiment, the terminal installation surface 114b is configured by a side surface of the cell case 114 in the second direction. That is, each external terminal 120 protrudes in the second direction from the side surface of the cell case 114 in the second direction. One of the pair of external terminals 120 protrudes from the side surface of the cell case 114 on one side in the second direction. The other of the pair of external terminals 120 protrudes from the side surface of the cell case 114 on the other side in the second direction.

[0026] 5, the first heat conduction member 151 has a shape extending from the one-end storage cell 101 to the other-end storage cell 102. The one-end storage cell 101 is the storage cell 100 arranged at one end in the first direction among the plurality of storage cells 100. The other-end storage cell 102 is the storage cell 100 arranged at the other end in the first direction among the plurality of storage cells 100.

[0027] The first heat conducting member 151 faces a portion of the valve installation surface 114a on one side of the safety valve SV in the second direction. The first heat conducting member 151 may be formed in a flat plate shape. The first heat conducting member 151 is made of a thermally conductive material. The first heat conducting member 151 is made of aluminum oxide or the like. The first heat conducting member 151 does not overlap with the safety valve SV in the vertical direction.

[0028] The second heat conducting member 152 has a shape that extends from the energy storage cell 101 on one end side to the energy storage cell 102 on the other end side. The second heat conducting member 152 faces a portion of the valve installation surface 114a on the other side of the safety valve SV in the second direction. The second heat conducting member 152 may be formed in a flat plate shape. The second heat conducting member 152 is made of a material having thermal conductivity. The second heat conducting member 152 is made of aluminum oxide or the like. The second heat conducting member 152 does not overlap with the safety valve SV in the vertical direction.

[0029] The first connection member 161 connects the first heat conduction member 151 and the plurality of energy storage cells 100. The first connection member 161 is provided between the first heat conduction member 151 and the valve installation surface 114a of each of the energy storage cells 100 arranged in odd-numbered order from the energy storage cell 101 on one end side to the energy storage cell 102 on the other end side among the plurality of energy storage cells 100. The first connection member 161 is preferably made of a heat conductive adhesive. Note that in FIG. 5, each first connection member 161 is indicated by diagonal lines.

[0030] The second connection member 162 connects the second heat conduction member 152 and the plurality of energy storage cells 100. The second connection member 162 is provided between the second heat conduction member 152 and the valve installation surface 114a of each of the energy storage cells 100 arranged in even numbers from the energy storage cell 101 on one end side to the energy storage cell 102 on the other end side among the plurality of energy storage cells 100. The second connection member 162 is preferably made of a heat conductive adhesive. Note that in FIG. 5, each second connection member 162 is indicated by diagonal lines.

[0031] The housing 200 houses a plurality of energy storage cells 100. In this embodiment, the housing 200 houses four energy storage stacks 11 to 14. As shown in FIG. 4 , the housing 200 has a lower case 210, an upper cover 220, and a panel member 230.

[0032] The lower case 210 is open upward and has a bottom wall 212 and a peripheral wall 215.

[0033] The bottom wall 212 is located below each of the power storage stacks 11 to 14. The bottom wall 212 may be formed in a flat plate shape.

[0034] Peripheral wall 215 stands upright from the peripheral edge of bottom wall 212. Peripheral wall 215 has a shape that surrounds the lower portions of each of power storage stacks 11-14.

[0035] The upper cover 220 is disposed above the plurality of energy storage cells 100. In this embodiment, the upper cover 220 is disposed above the four energy storage stacks 11 to 14. The upper cover 220, together with the lower case 210, accommodates the four energy storage stacks 11 to 14 in a sealed state. The periphery of the upper cover 220 is connected to the periphery of the lower case 210 by bolts or the like via a sealing member.

[0036] 4, the upper cover 220 has an upper wall 225. The upper wall 225 is provided above at least one energy storage cell 100. In this embodiment, the upper wall 225 is provided above the four energy storage stacks 11 to 14. The upper wall 225 has a top portion 225a and four recesses 225b.

[0037] The top portion 225a is formed flat and overlaps the ends of the power storage stacks in the second direction in the vertical direction.

[0038] Each recess 225b is recessed downward from the top portion 225a. Each recess 225b is formed flat. Each recess 225b 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 225b in the second direction is shorter than the length of the energy storage cell 100 in the second direction. Each recess 225b is in contact with the upper surface of the cell casing 114 via a thermally conductive adhesive 910.

[0039] The panel member 230 is provided below the lower case 210. The panel member 230 has a function of protecting the lower case 210. The panel member 230 may be formed in a flat plate shape. As shown in FIG. 4 , the peripheral edge of the panel member 230 is connected to the lower case 210 via a bracket 80.

[0040] The structural member 300 is provided on the bottom wall 212. Each of the power storage stacks 11 to 14, the bottom wall 212, and the structural member 300 defines a space S below each of the power storage stacks 11 to 14. In this embodiment, the structural member 300, together with each of the power storage stacks 11 to 14 and the bottom wall 212, defines a space S below each of the power storage stacks 11 to 14. That is, in this embodiment, four spaces S are formed inside the housing 200.

[0041] 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.

[0042] As shown in FIG. 3, an explosion-proof valve 290 is provided in a portion of the peripheral wall 215 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 discharged from any of the energy storage cells 100, the gas spreads in the first direction through the smoke exhaust path S and is discharged to the outside of the housing 200 through the explosion-proof valve 290.

[0043] 4, the structural member 300 is in contact with both ends of the valve installation surface 114a of each energy storage cell 100 in the second direction and with the bottom wall 212. The structural member 300 may support each of the energy storage stacks 11 to 14. In this embodiment, the structural member 300 has a pair of base portions 310 and a pair of seal portions 320.

[0044] The pair of base portions 310 are connected to the bottom wall 212. The pair of base portions 310 are arranged at positions facing each other in the second direction (width direction) with the safety valve SV interposed therebetween.

[0045] Each seal portion 320 contacts the valve mounting surface 114a of the energy storage cell 100 and the base portion 310. Each seal portion 320 may be formed of urethane resin. Each seal portion 320 extends in a first direction. The inner surface of each seal portion 320 in the second direction contacts the smoke exhaust path S.

[0046] The reinforcing portion 400 reinforces the bottom wall 212. The reinforcing portion 400 is disposed between a pair of power storage stacks (a pair of power storage cell groups) adjacent to each other in the second direction. Specifically, as shown in Fig. 4, the reinforcing portion 400 is disposed between a pair of cell bodies 110 adjacent to each other in the second direction and below a pair of external terminals 120 adjacent to each other in the second direction. The reinforcing portion 400 overlaps in the up-down direction with both of the pair of external terminals 120 facing each other in the second direction.

[0047] The reinforcing portion 400 extends along the first direction. An end of the reinforcing portion 400 in the first direction may be in contact with the peripheral wall 215 or may be spaced apart from the peripheral wall 215. The reinforcing portion 400 is connected to the base portion 310. In this embodiment, the reinforcing portion 400 is connected to the raised portion 312 of the base portion 310 by welding or the like. That is, the reinforcing portion 400 functions as a connecting portion that connects a structural member 300 provided below one of a pair of adjacent power storage stacks (e.g., the first power storage stack 11 and the second power storage stack 12) to a structural member 300 provided below the other of the pair of power storage stacks. The reinforcing portion 400 has a shape that protrudes upward from the base portion 310.

[0048] The cooler 500 cools at least one energy storage cell 100. A cooling medium (such as water) flows through the cooler 500. As shown in FIGS. 2 to 4, the cooler 500 is provided on the upper wall 225. More specifically, the cooler 500 is provided in the recess 225b of the upper wall 225.

[0049] The cooler 500 is in thermal contact with at least one energy storage cell 100 via the upper wall 225. In this embodiment, a thermally conductive adhesive 910 extending along the first direction is provided between the cooler 500 and the recess 225b. That is, in this embodiment, the cooler 500 is in thermal contact with each of the energy storage stacks 11 to 14 via the upper wall 225 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 upper wall 225, 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 covering member 600 covers the cooler 500. The covering member 600 may be made of a material having heat insulating properties. Note that the covering member 600 is not shown in Figures 2 and 3.

[0051] The cooler 500 and the covering member 600 form at least a part of the floor 30 of the vehicle compartment (see FIG. 3). In addition to the cooler 500 and the covering member 600, the floor 30 of the vehicle compartment may include floor constituent members (such as a buffer member or carpet) placed on the covering member 600. Note that the floor constituent members are not shown in FIGS. 2 and 4.

[0052] 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.

[0053] Furthermore, in this energy storage device 10, a heat transfer path is formed that connects each of the energy storage cells 100 arranged alternately among the multiple energy storage cells 100 included in each of the energy storage stacks 11 to 14, thereby suppressing heat transfer between adjacent energy storage cells 100.

[0054] In addition, because the first heat conductive member 151 and the second heat conductive member 152 are disposed below each of the power storage stacks 11 to 14, collision of the bottom wall 212 with the valve installation surface 114a of the cell casing 114 is suppressed when a load acts on the power storage device 10 from below. Therefore, the shape of the safety valve SV is effectively maintained.

[0055] In the above embodiment, as shown in FIG. 6, the first heat conducting member 151 may have a first outer heat conducting element 151a and a first inner heat conducting element 151b, and the second heat conducting member 152 may have a second outer heat conducting element 152a and a second inner heat conducting element 152b.

[0056] The first outer heat conducting element 151a is disposed on the outside in the second direction. The first outer heat conducting element 151a is formed in a flat plate shape.

[0057] The first inner heat-conducting element 151b is disposed on the inside in the second direction. The first inner heat-conducting element 151b is disposed between the first outer heat-conducting element 151a and each safety valve SV. The first inner heat-conducting element 151b is spaced apart from the first outer heat-conducting element 151a in the second direction.

[0058] The second outer heat conducting element 152a is disposed on the outside in the second direction and has a flat plate shape.

[0059] The second inner heat-conducting element 152b is disposed on the inside in the second direction. The second inner heat-conducting element 152b is disposed between the second outer heat-conducting element 152a and each safety valve SV. The second inner heat-conducting element 152b is spaced apart from the second outer heat-conducting element 152a in the second direction.

[0060] The first connecting member 161 may have a first outer connecting element 161a and a first inner connecting element 161b, and the second connecting member 162 may have a second outer connecting element 162a and a second inner connecting element 162b.

[0061] The first outer connection elements 161a are provided between every third energy storage cell 100 arranged in the first direction and the first outer heat conducting element 151a.

[0062] The first inner connection element 161b is provided between each of the plurality of storage cells 100 other than the storage cells 100 in contact with the first outer connection element 161a, which are arranged every third storage cell 100 in the first direction, and the first inner heat conduction element 151b.

[0063] The second outer connection elements 162a are provided between every third energy storage cell 100 arranged in the first direction and the second outer heat conducting element 152a.

[0064] The second inner connection element 162b is provided between each of the plurality of storage cells 100 other than the storage cells 100 in contact with the second outer connection element 162a, that is, the storage cells 100 arranged every third cell in the first direction, and the second inner heat conduction element 152b.

[0065] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0066] [Aspect 1] a plurality of storage cells arranged in a line along a first direction; a first heat conduction member having a shape extending from a one-end side storage cell arranged at one end in the first direction among the plurality of storage cells to an other-end side storage cell arranged at the other end in the first direction among the plurality of storage cells; a second heat conduction member having a shape extending from the one end side energy storage cell to the other end side energy storage cell; a first connection member that connects the first heat conduction member and the plurality of energy storage cells; a second connection member that connects the second heat conduction member and the plurality of electricity storage cells, Each of the storage cells has a cell case including a valve mounting surface on which a safety valve is provided, the first heat conduction member faces a portion of the valve installation surface on one side of the safety valve in a second direction perpendicular to both the first direction and the up-down direction, the second heat conduction member faces a portion of the valve installation surface on the other side of the safety valve in the second direction, the first connection member is provided between the valve installation surface of each of the storage cells arranged in odd-numbered order from the one-end side storage cell toward the other-end side storage cell among the plurality of storage cells and the first heat conduction member, the second connection member is provided between the valve installation surface of each of the storage cells arranged in even numbers from the one end side storage cell toward the other end side storage cell among the plurality of storage cells and the second heat conduction member.

[0067] In this electricity storage device, a heat transfer path is formed that connects every other one of the plurality of electricity storage cells, thereby suppressing heat transfer between adjacent electricity storage cells.

[0068] [Aspect 2] The first thermal conductive member is a first outer heat conduction element; a first inner heat conducting element disposed between the first outer heat conducting element and each of the safety valves; The second thermal conductive member is a second outer heat conduction element; a second inner heat conducting element disposed between the second outer heat conducting element and each of the safety valves; The first connecting member is a first outer connection element provided between every third storage cell in the first direction and the first outer heat conducting element; a first inner connection element provided between each of the plurality of power storage cells, other than the power storage cells in contact with the first outer connection element, and every third power storage cell in the first direction, and the first inner heat conducting element; The second connecting member is a second outer connection element provided between every third storage cell in the first direction and the second outer heat conducting element; a second inner connection element provided between each of the plurality of storage cells, other than the storage cells in contact with the second outer connection element, and every third storage cell in the first direction, and the second inner heat conduction element.

[0069] [Aspect 3] further comprising a cooler that cools the plurality of power storage cells; the valve installation surface is formed by the lower surface of the cell case, 3. The power storage device according to claim 1, wherein the cooler is disposed above the cell case.

[0070] In this embodiment, the cooler cools each of the power storage cells, so that heat transfer between the power storage cells is more effectively suppressed.

[0071] [Aspect 4] Aspect 4. The power storage device according to any one of aspects 1 to 3, wherein the first connecting member and the second connecting member are made of a thermally conductive adhesive.

[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 power storage device, 11 to 14 power storage stack, 11A first power storage cell group, 12A second power storage cell group, 20 frame member, 21 first frame, 22 second frame, 23 cross frame, 31 front component member, 32 rear component member, 51 end plate, 52 monitoring unit, 100 power storage cell, 110 cell body, 112 electrode body, 114 cell case, 114a valve installation surface, 114b terminal installation surface, 120 external terminal, 151 first heat conduction member, 151a first outer heat conduction element, 151b first inner heat conduction element, 152 second heat conduction member, 152a second outer heat conduction element, 152b second inner heat conduction element, 161 first connection member, 161a first outer connection element, 161b first inner connection element, 162 Second connecting member, 162a second outer connecting element, 162b second inner connecting element, 200 housing, 210 lower case, 212 bottom wall, 215 peripheral wall, 220 upper cover, 225 top wall, 225a top portion, 225b recess, 230 panel member, 290 explosion-proof valve, 300 structural member, 310 base portion, 320 sealing portion, 400 reinforcing portion, 500 cooler, 600 covering member, 910 thermally conductive adhesive, S space (smoke exhaust path), SV safety valve.

Claims

1. a plurality of storage cells arranged in a line along a first direction; a first heat conduction member having a shape extending from a one-end side storage cell arranged at one end in the first direction among the plurality of storage cells to an other-end side storage cell arranged at the other end in the first direction among the plurality of storage cells; a second heat conduction member having a shape extending from the one end side energy storage cell to the other end side energy storage cell; a first connection member that connects the first heat conduction member and the plurality of energy storage cells; a second connection member that connects the second heat conduction member and the plurality of electricity storage cells, Each of the storage cells has a cell case including a valve mounting surface on which a safety valve is provided, the first heat conduction member faces a portion of the valve installation surface on one side of the safety valve in a second direction perpendicular to both the first direction and the up-down direction, the second heat conduction member faces a portion of the valve installation surface on the other side of the safety valve in the second direction, the first connection member is provided between the valve installation surface of each of the storage cells arranged in odd-numbered order from the one-end storage cell toward the other-end storage cell among the plurality of storage cells and the first heat conduction member, the second connection member is provided between the valve installation surface of each of the plurality of storage cells that is arranged in an even-numbered order from the one-end storage cell toward the other-end storage cell and the second heat conduction member.

2. The first thermal conductive member is a first outer heat conduction element; a first inner heat conducting element disposed between the first outer heat conducting element and each of the safety valves; The second heat conducting member is a second outer heat conducting element; a second inner heat conducting element disposed between the second outer heat conducting element and each of the safety valves; The first connecting member is a first outer connection element provided between every third storage cell in the first direction and the first outer heat conducting element; a first inner connection element provided between each of the plurality of power storage cells, other than the power storage cells in contact with the first outer connection element, and every third power storage cell in the first direction, and the first inner heat conducting element; The second connecting member is a second outer connection element provided between every third storage cell in the first direction and the second outer heat conducting element; 2. The energy storage device according to claim 1, further comprising: a second inner connection element provided between each of the plurality of energy storage cells, other than the energy storage cells in contact with the second outer connection element, and the second inner heat conducting element, the second inner connection element being arranged at every third energy storage cell in the first direction.

3. further comprising a cooler that cools the plurality of power storage cells; the valve installation surface is formed by the lower surface of the cell case, The power storage device according to claim 1 , wherein the cooler is disposed above the cell case.

4. The power storage device according to claim 1 , wherein the first connecting member and the second connecting member are made of a thermally conductive adhesive.

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