Electricity storage device

Abstract

The invention relates to a power storage device. A power storage device includes a plurality of power storage cells, a first heat transfer member, a second heat transfer member, a first connection member, and a second connection member. The first heat transfer member faces a portion on one side of the safety valve in the second direction. And the second heat conduction component is opposite to a part on the other side of the safety valve in the second direction. The first connection member is provided between the first heat transfer member and the valve installation surface of each of the odd-numbered electricity storage cells arranged from the one-end-side electricity storage cell toward the other-end-side electricity storage cell. The second connection member is provided between the second heat transfer member and the valve installation surface of each of the even-numbered electricity storage cells arranged from the one-end-side electricity storage cell toward the other-end-side electricity storage cell.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an electrical storage device. BACKGROUND

[0002] For example, a power battery pack provided with a plurality of single cells and a housing device is disclosed in Japanese Laid-Open Patent Publication No. 2022-525014. An external terminal and an explosion-proof valve are provided on the side surface of the housing of each single cell. SUMMARY

[0003] In the electrical storage device described in Japanese Laid-Open Patent Publication No. 2022-525014, there is room for improvement in the resistance to heat transfer between electrical storage units adjacent to each other.

[0004] An object of the present disclosure is to provide an electrical storage device capable of suppressing heat transfer between electrical storage units adjacent to each other.

[0005] The electrical storage device of one aspect of the present disclosure is provided with: a plurality of electrical storage units arranged in a manner arranged along a first direction; a first heat conduction member having a shape extending in a manner reaching from a one-end-side electrical storage unit to a other-end-side electrical storage unit, the one-end-side electrical storage unit being an electrical storage unit arranged at one end in the first direction among the plurality of electrical storage units, the other-end-side electrical storage unit being an electrical storage unit arranged at the other end in the first direction among the plurality of electrical storage units; a second heat conduction member having a shape extending in a manner reaching from the one-end-side electrical storage unit to the other-end-side electrical storage unit; a first connection member connecting the first heat conduction member and the plurality of electrical storage units; and a second connection member connecting the second heat conduction member and the plurality of electrical storage units, each of the electrical storage units having a unit housing including a valve arrangement surface provided with a safety valve, the first heat conduction member facing a portion of the safety valve on one side in a second direction orthogonal to both the first direction and an up-down direction among the valve arrangement surfaces, the second heat conduction member facing a portion of the safety valve on the other side in the second direction among the valve arrangement surfaces, the first connection member being arranged between the valve arrangement surfaces of each of the electrical storage units arranged as an odd number from the one-end-side electrical storage unit toward the other-end-side electrical storage unit among the plurality of electrical storage units and the first heat conduction member, and the second connection member being arranged between the valve arrangement surfaces of each of the electrical storage units arranged as an even number from the one-end-side electrical storage unit toward the other-end-side electrical storage unit among the plurality of electrical storage units and the second heat conduction member.

[0006] According to the present disclosure, it is possible to provide an electrical storage device capable of suppressing heat transfer between electrical storage units adjacent to each other. BRIEF DESCRIPTION OF DRAWINGS

[0007] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals denote the same elements, wherein:

[0008] Figure 1 This is a schematic diagram of a vehicle equipped with an energy storage device according to one embodiment of the present disclosure.

[0009] Figure 2 It is a three-dimensional view that roughly represents the energy storage device, frame components, front components, and rear components.

[0010] Figure 3 yes Figure 2 A sectional view along line III-III.

[0011] Figure 4 yes Figure 3 A cross-sectional view along line IV-IV.

[0012] Figure 5 It is a bottom view of the battery pack and its various heat-conducting components.

[0013] Figure 6 This is a bottom view of a modified example of the battery pack and its various heat-conducting components. Detailed Implementation

[0014] Embodiments of this disclosure will be described with reference to the accompanying drawings. It should be noted that in the drawings referred to below, the same or equivalent components are labeled with the same reference numerals.

[0015] Figure 1 This is a schematic diagram of a vehicle equipped with an energy storage device according to one embodiment of the present disclosure. Figure 2 It is a three-dimensional drawing that roughly represents the energy storage device, frame components, and vehicle skeleton. Figure 3 yes Figure 2 A sectional view along line III-III. Figure 4 yes Figure 3 A cross-sectional view along line IV-IV.

[0016] like Figure 1 As shown, vehicle 1 includes a vehicle body 2 and an electric storage device 10. Examples of vehicles 1 include hybrid electric vehicles, plug-in hybrid electric vehicles, and battery electric vehicles.

[0017] like Figure 1 as well as Figure 2As shown, the vehicle body 2 includes a frame member 20, a front structure member 31, and a rear structure 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 member 23.

[0018] The pair of first frames 21 face each other in a first direction. The first direction can also be a direction parallel to the front-rear direction of the vehicle 1. In Figure 2 In the example shown, the first frame 21 disposed at the front has a shape extending along a second direction orthogonal to both the first direction and the up-down direction. The first frame 21 disposed at the rear has a shape extending along the second direction and protruding toward the rear. The second direction can also be a direction parallel to the left-right direction (width direction) of the vehicle 1.

[0019] 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. The end portions of each second frame 22 in the first direction are connected to the first frame 21. The pair of second frames 22, together with the pair of first frames 21, form a substantially square cylindrical shape that encloses the power storage device 10.

[0020] The cross member 23 is disposed between the pair of first frames 21 and links the pair of second frames 22 to each other. The cross member 23 constitutes, for example, a seat cross member.

[0021] The front structure member 31 is connected to the front portion of the frame member 20. The rear structure member 32 is connected to the rear portion of the frame member 20. Each structure member 31, 32 can also be formed by aluminum die casting.

[0022] The power storage device 10 is mounted to the frame member 20. As Figure 2 and Figure 3 As shown, the power storage device 10 is disposed below the cross member 23. As Figures 1 to 4 As shown, 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 frame 200, a structure member 300, a reinforcement 400, a cooler 500, and a cover member 600. Note that the number of power storage stacks is not limited to four. Note that, in Figure 2 , the illustration of the cover member 600 is omitted.

[0023] Each power storage stack 11 to 14 includes at least one power storage cell 100. In the present embodiment, each power storage stack 11 to 14 includes a group of power storage cells including a plurality of (for example, 50) power storage cells 100 disposed in a manner aligned along the first direction. Each power storage stack 11 to 14 can also include a plurality of spacers 105 (refer to Figure 5). Each spacer 105 is arranged between a pair of power storage units 100 adjacent to each other in the group of power storage units. Each power storage stack 11 to 14 is formed in a rectangular parallelepiped shape that is long in the first direction. As shown in Figure 2 , the four power storage stacks 11 to 14 are arranged in a manner of being aligned in the second direction.

[0024] As shown in Figure 3 , on both sides of the plurality of power storage units 100 in the first direction, a pair of end plates 51 that sandwich the plurality of power storage units 100 from both sides in the first direction is provided. On the outer side of each end plate 51 in the first direction, a smart battery management 52 is arranged.

[0025] As shown in Figure 4 , each power storage unit 100 has a unit main body 110 and a pair of external terminals 120. Note that, in Figure 4 , a part of the power storage units 100 included in the first power storage unit group 11A of the first power storage stack 11 and the power storage units 100 included in the second power storage unit group 12A of the second power storage stack 12 are shown.

[0026] The unit main body 110 has an electrode body 112 and a unit case 114. The thickness direction of the unit main body 110 corresponds to the first direction. The width direction of the unit main body 110 (a direction orthogonal to both the thickness direction and the up-down direction) corresponds to the second direction.

[0027] The electrode body 112 can be configured of a jelly-roll in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween, or can be configured of a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The electrode body 112 is formed in a shape that is long in the second direction.

[0028] The unit case 114 accommodates the electrode body 112. The unit case 114 is formed in a rectangular parallelepiped shape. The unit case 114 is configured of a metal such as aluminum. The unit case 114 includes a valve arrangement surface 114a and a terminal arrangement surface 114b.

[0029] A safety valve SV is provided on the valve arrangement surface 114a. In the present embodiment, the valve arrangement surface 114a is configured of a lower surface of the unit case 114. However, the valve arrangement surface 114a can be configured of an upper surface of the unit case 114.

[0030] An external terminal 120 is provided on the terminal placement surface 114b. In the present embodiment, the terminal placement surface 114b is constituted by the side surface of the unit housing 114 in the second direction. That is, each external terminal 120 protrudes in the second direction from the side surface of the unit housing 114 in the second direction. One of the pair of external terminals 120 protrudes in the second direction from the side surface of the unit housing 114 on one side. The other of the pair of external terminals 120 protrudes in the second direction from the side surface of the unit housing 114 on the other side.

[0031] As shown in FIG. 1, the first heat conducting member 151 has a shape extending in such a manner as to reach the other end side electric storage unit 102 from the one end side electric storage unit 101. The one end side electric storage unit 101 is an electric storage unit 100 of the end portion arranged on one side in the first direction among the plurality of electric storage units 100. The other end side electric storage unit 102 is an electric storage unit 100 of the end portion arranged on the other side in the first direction among the plurality of electric storage units 100. Figure 5

[0032] The first heat conducting member 151 faces a portion of the safety valve SV on one side in the second direction in the valve placement surface 114a. The first heat conducting member 151 can also be formed in a flat plate shape. The first heat conducting member 151 is constituted by a material having heat conductivity. The first heat conducting member 151 is constituted by alumina or the like. The first heat conducting member 151 does not overlap the safety valve SV in the up and down direction.

[0033] The second heat conducting member 152 has a shape extending in such a manner as to reach the other end side electric storage unit 102 from the one end side electric storage unit 101. The second heat conducting member 152 faces a portion of the safety valve SV on the other side in the second direction in the valve placement surface 114a. The second heat conducting member 152 can also be formed in a flat plate shape. The second heat conducting member 152 is constituted by a material having heat conductivity. The second heat conducting member 152 is constituted by alumina or the like. The second heat conducting member 152 does not overlap the safety valve SV in the up and down direction.

[0034] The first connecting member 161 connects the first heat conducting member 151 and the plurality of electric storage units 100. The first connecting member 161 is provided between the valve placement surface 114a of each electric storage unit 100 arranged as the odd number on the other end side electric storage unit 102 side from the one end side electric storage unit 101 among the plurality of electric storage units 100 and the first heat conducting member 151. The first connecting member 161 is preferably constituted by a heat conductive adhesive. Note that, in the present embodiment, each first connecting member 161 is indicated by a diagonal line. Figure 5

[0035] ​​The second connecting member 162 connects the second heat conducting member 152 and the plurality of power storage units 100. The second connecting member 162 is provided between the valve arrangement surface 114a of each power storage unit 100 configured as the even-numbered one from the one-end side power storage unit 101 toward the other-end side power storage unit 102 and the second heat conducting member 152. The second connecting member 162 is preferably composed of a thermally conductive adhesive. Note that in Figure 5 , each second connecting member 162 is indicated by a diagonal line.

[0036] The frame 200 houses the plurality of power storage units 100. In the present embodiment, the frame 200 houses the four power storage stacks 11 to 14. As shown in Figure 4 , the frame 200 has a lower case 210, an upper cover 220, and a panel member 230.

[0037] The lower case 210 is open upward. The lower case 210 has a bottom wall 212 and a peripheral wall 215.

[0038] The bottom wall 212 is located below each of the power storage stacks 11 to 14. The bottom wall 212 can also be formed in a flat plate shape.

[0039] The peripheral wall 215 stands from the peripheral edge portion of the bottom wall 212. The peripheral wall 215 has a shape that collectively surrounds the lower portions of the power storage stacks 11 to 14.

[0040] The upper cover 220 is arranged above the plurality of power storage units 100. In the present embodiment, the upper cover 220 is arranged above the four power storage stacks 11 to 14. The upper cover 220 houses the four power storage stacks 11 to 14 in a sealed state together with the lower case 210. The peripheral edge portion of the upper cover 220 is connected to the peripheral edge portion of the lower case 210 via a sealing member by a bolt or the like.

[0041] As shown in Figure 4 , the upper cover 220 has an upper wall 225. The upper wall 225 is provided above at least one power storage unit 100. In the present embodiment, the upper wall 225 is provided above the four power storage stacks 11 to 14. The upper wall 225 has a top portion 225a and four recessed portions 225b.

[0042] The top portion 225a is formed flat. The top portion 225a overlaps the end portion of each power storage stack in the second direction in the up-down direction.

[0043] Each recessed portion 225b is recessed downward from the top portion 225a. Each recessed portion 225b is formed flat. Each recessed portion 225b is formed above the central portion of each power storage stack 11 to 14 in the second direction. As shown in Figure 4As shown, the length of each recess 225b in the second direction is shorter than the length of the power storage unit 100 in the second direction. Each recess 225b is in contact with the upper surface of the unit case 114 via a thermally conductive adhesive 910.

[0044] 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 can also be formed in a flat plate shape. As Figure 4 As shown, the peripheral edge portion of the panel member 230 is connected to the lower case 210 via the bracket 80.

[0045] The structure member 300 is provided to the bottom wall 212. Each power storage stack 11 to 14, the bottom wall 212, and the structure member 300 define a space S below each power storage stack 11 to 14. In the present embodiment, the structure member 300 defines the space S below each power storage stack 11 to 14 together with each power storage stack 11 to 14 and the bottom wall 212. That is, in the present embodiment, four spaces S are formed in the frame 200.

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

[0047] As Figure 3 As shown, an explosion-proof valve 290 is provided in the peripheral wall 215 at a portion facing the smoke exhaust path S in the first direction. The explosion-proof valve 290 is provided in the above-mentioned common space in the frame 200. The explosion-proof valve 290 releases pressure in the frame 200. The explosion-proof valve 290 opens when the pressure in the frame 200 reaches a reference value or more. The explosion-proof valve 290 is constituted by a check valve. As Figure 3 As shown, in the case where gas is discharged from any one of the power storage units 100, the gas diffuses in the first direction through the smoke exhaust path S and is exhausted to the outside of the frame 200 through the explosion-proof valve 290.

[0048] As Figure 4 As shown, the structure member 300 is in contact with both end portions of the valve arrangement surface 114a of each power storage unit 100 in the second direction and the bottom wall 212. The structure member 300 can also support each power storage stack 11 to 14. In the present embodiment, the structure member 300 has a base portion 310 and a seal portion 320.

[0049] A pair of base portions 310 is connected to the bottom wall 212. The pair of base portions 310 is disposed at positions facing each other across the safety valve SV in the second direction (width direction).

[0050] Each seal portion 320 is in contact with the valve placement surface 114a of the power storage unit 100 and the base portion 310. Each seal portion 320 can also be formed of polyurethane resin. Each seal portion 320 extends in the first direction. An inner surface of the seal portion 320 in the second direction is in contact with the smoke exhaust path S.

[0051] The reinforcement portion 400 reinforces the bottom wall 212. The reinforcement portion 400 is disposed between a pair of power storage stacks (a pair of power storage unit groups) adjacent to each other in the second direction. Specifically, as shown in FIG. 2, the reinforcement portion 400 is disposed between a pair of unit 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 reinforcement portion 400 overlaps both of the pair of external terminals 120 facing each other in the second direction in the up-down direction. Figure 4

[0052] The reinforcement portion 400 extends along the first direction. An end portion of the reinforcement portion 400 in the first direction can be in contact with the peripheral wall 215 or can be away from the peripheral wall 215. The reinforcement portion 400 is connected to the base portion 310. In the present embodiment, the reinforcement portion 400 is connected to the protrusion portion 312 (not shown) of the base portion 310 by welding or the like. That is, the reinforcement portion 400 has a function as a linking portion that links the structural member 300 disposed below one of the pair of power storage stacks (for example, the first power storage stack 11 and the second power storage stack 12) and the structural member 300 disposed below the other of the pair of power storage stacks. The reinforcement portion 400 has a shape protruding upward from the base portion 310.

[0053] The cooler 500 cools at least one power storage unit 100. A cooling medium (water or the like) flows in the cooler 500. As shown in FIG. 2, the cooler 500 is disposed on the upper wall 225. More specifically, the cooler 500 is disposed in the recessed portion 225b of the upper wall 225. Figures 2 to 4

[0054] The cooler 500 is in thermal contact with at least one power storage unit 100 via the upper wall 225. In the present embodiment, between the cooler 500 and the recessed portion 225b, a thermally conductive adhesive 910 extending along the first direction is provided. That is, in the present embodiment, the cooler 500 is in thermal contact with each power storage stack 11 to 14 via the upper wall 225 and the thermally conductive adhesive 910. Note that the thermal contact includes a manner in which the cooler 500 is in contact with the power storage unit 100 only via the upper wall 225, and a manner in which the cooler 500 is in contact with the power storage unit 100 indirectly via a member having thermal conductivity (an adhesive, a fixing member, or the like).

[0055] The cover member 600 covers the cooler 500. The cover member 600 can also be formed of a material having thermal insulation. Note that in the present embodiment, the cover member 600 is in contact with the upper wall 225.​​Figure 2 and Figure 3 In the above, the illustration of the cover member 600 is omitted.

[0056] The cooler 500 and the cover member 600 form at least a portion of a floor portion 30 (refer to Figure 3 ) of a vehicle cabin. The floor portion 30 of the vehicle cabin can include, in addition to the cooler 500 and the cover member 600, a floor constituting member (a cushion member, a carpet, or the like) disposed on the cover member 600. Note that, in the above, the illustration of the floor constituting member is omitted. Figure 2 and Figure 4 In the above, the illustration of the cover member 600 is omitted.

[0057] In the above-described electricity storage device 10, when gas is discharged from the safety valve SV toward the lower side due to a short circuit or the like in any one of the electricity storage cells 100, the gas flows into the smoke exhaust path S. Then, the gas that has flowed into the smoke exhaust path S is diffused in the first direction and is discharged from the frame 200 through the explosion-proof valve 290 as shown in Figure 3 . Thus, it is possible to suppress the adhesion of the contents (so-called fragments) of the electricity storage cell 100 contained in the above-described gas to the external terminal 120 or the like of the electricity storage cell 100.

[0058] Further, in the electricity storage device 10, since the heat transfer path that connects the electricity storage cells 100 disposed at every other one of the plurality of electricity storage cells 100 included in each of the electricity storage stacks 11 to 14 is formed, it is possible to suppress the heat transfer between the electricity storage cells 100 adjacent to each other.

[0059] Further, since the first heat conducting member 151 and the second heat conducting member 152 are disposed below each of the electricity storage stacks 11 to 14, it is possible to suppress the collision of the bottom wall 212 with the valve setting surface 114a of the cell case 114 when a load acts on the electricity storage device 10 from the lower side. Thus, it is possible to effectively maintain the shape of the safety valve SV.

[0060] In the above-described embodiment, as shown in Figure 6 , the first heat conducting member 151 can also have a first outer heat conducting element 151a and a first inner heat conducting element 151b, and the second heat conducting member 152 can also have a second outer heat conducting element 152a and a second inner heat conducting element 152b.

[0061] The first outer heat conducting element 151a is disposed on the outer side in the second direction. The first outer heat conducting element 151a is formed in a flat plate shape.

[0062] The first inner heat conducting member 151b is arranged on the inner side in the second direction. The first inner heat conducting member 151b is arranged between the first outer heat conducting member 151a and each safety valve SV. The first inner heat conducting member 151b is spaced apart from the first outer heat conducting member 151a in the second direction.

[0063] The second outer heat conducting member 152a is arranged on the outer side in the second direction. The second outer heat conducting member 152a is formed in a flat plate shape.

[0064] The second inner heat conducting member 152b is arranged on the inner side in the second direction. The second inner heat conducting member 152b is arranged between the second outer heat conducting member 152a and each safety valve SV. The second inner heat conducting member 152b is spaced apart from the second outer heat conducting member 152a in the second direction.

[0065] The first connecting member 161 can also have a first outer connecting member 161a and a first inner connecting member 161b, and the second connecting member 162 can also have a second outer connecting member 162a and a second inner connecting member 162b.

[0066] The first outer connecting member 161a is provided between each of the plurality of power storage units 100 arranged at intervals of three in the first direction and the first outer heat conducting member 151a.

[0067] The first inner connecting member 161b is provided between each of the plurality of power storage units 100 other than the power storage unit 100 in contact with the first outer connecting member 161a and the first inner heat conducting member 151b, and arranged at intervals of three in the first direction.

[0068] The second outer connecting member 162a is provided between each of the plurality of power storage units 100 arranged at intervals of three in the first direction and the second outer heat conducting member 152a.

[0069] The second inner connecting member 162b is provided between each of the plurality of power storage units 100 other than the power storage unit 100 in contact with the second outer connecting member 162a and the second inner heat conducting member 152b, and arranged at intervals of three in the first direction.

[0070] The person skilled in the art understands that the above-described exemplary embodiments are specific examples of the following modes.

[0071] [Mode 1]

[0072] A power storage device, wherein the power storage device includes:

[0073] a plurality of power storage units arranged in a row along a first direction;

[0074] a first heat conductive member having a shape extending from a one-end side power storage unit to another-end side power storage unit, the one-end side power storage unit being a power storage unit disposed at one end in the first direction among the plurality of power storage units, the another-end side power storage unit being a power storage unit disposed at another end in the first direction among the plurality of power storage units;

[0075] a second heat conductive member having a shape extending from the one-end side power storage unit to the another-end side power storage unit;

[0076] a first connecting member connecting the first heat conductive member and the plurality of power storage units; and

[0077] a second connecting member connecting the second heat conductive member and the plurality of power storage units,

[0078] each of the power storage units has a unit case including a valve disposed surface in which a safety valve is disposed,

[0079] the first heat conductive member faces a portion of the safety valve on one side in a second direction orthogonal to both the first direction and an up-down direction in the valve disposed surface,

[0080] the second heat conductive member faces a portion of the safety valve on another side in the second direction in the valve disposed surface,

[0081] the first connecting member is disposed between the valve disposed surface of each of the power storage units disposed as an odd number from the one-end side power storage unit toward the another-end side power storage unit and the first heat conductive member,

[0082] the second connecting member is disposed between the valve disposed surface of each of the power storage units disposed as an even number from the one-end side power storage unit toward the another-end side power storage unit and the second heat conductive member.

[0083] In the power storage device, since a heat transfer path connecting each of the power storage units disposed at every other one among the plurality of power storage units is formed, heat transfer between the power storage units adjacent to each other can be suppressed.

[0084] [Mode 2]

[0085] In the power storage device according to Mode 1,

[0086] the first heat conductive member has:

[0087] a first outer heat conductive element; and

[0088] a first inner side heat conducting element disposed between the first outer side heat conducting element and each of the safety valves,

[0089] The second heat conducting member has:

[0090] a second outer side heat conducting element; and

[0091] a second inner side heat conducting element disposed between the second outer side heat conducting element and each of the safety valves,

[0092] The first connecting member has:

[0093] a first outer side connecting element disposed between each of the power storage units arranged every three in the first direction and the first outer side heat conducting element; and

[0094] a first inner side connecting element disposed between each of the power storage units arranged every three in the first direction and the first inner side heat conducting element, except for the power storage units in contact with the first outer side connecting element among the plurality of power storage units,

[0095] The second connecting member has:

[0096] a second outer side connecting element disposed between each of the power storage units arranged every three in the first direction and the second outer side heat conducting element; and

[0097] a second inner side connecting element disposed between each of the power storage units arranged every three in the first direction and the second inner side heat conducting element, except for the power storage units in contact with the second outer side connecting element among the plurality of power storage units.

[0098] [Mode 3]

[0099] In the power storage device according to Mode 1 or 2,

[0100] a cooler that cools the plurality of power storage units is further provided,

[0101] The valve arrangement surface is constituted by a lower surface of the unit case,

[0102] The cooler is disposed above the unit case.

[0103] In this mode, since each of the power storage units is cooled by the cooler, heat transfer between the power storage units can be more effectively suppressed.

[0104] [Mode 4]

[0105] The power storage device according to any one of modes 1 to 3,

[0106] The first connecting member and the second connecting member are made of a thermally conductive adhesive.

[0107] Note that the embodiments disclosed herein should be considered in all respects as illustrative and not restrictive. The scope of the disclosure is indicated not by the above description of embodiments, but by the claims, and includes all modifications within the meaning and range of equivalency of the claims.

Claims

1. An electric power storage device, wherein, The power storage device includes: a plurality of power storage units arranged in a row along a first direction; a first heat conducting member having a shape extending from a one-end-side power storage unit to a other-end-side power storage unit, the one-end-side power storage unit being a power storage unit arranged at one end in the first direction among the plurality of power storage units, the other-end-side power storage unit being a power storage unit arranged at the other end in the first direction among the plurality of power storage units; a second heat conducting member having a shape extending from the one-end-side power storage unit to the other-end-side power storage unit; a first connecting member connecting the first heat conducting member and the plurality of power storage units; and a second connecting member connecting the second heat conducting member and the plurality of power storage units, each of the power storage units has a unit case including a valve arrangement surface provided with a safety valve, the first heat conducting member faces a portion of the safety valve on one side in a second direction orthogonal to both the first direction and an up-down direction among the valve arrangement surfaces, the second heat conducting member faces a portion of the safety valve on the other side in the second direction among the valve arrangement surfaces, the first connecting member is arranged between the valve arrangement surfaces of the power storage units arranged as odd-numbered units from the one-end-side power storage unit toward the other-end-side power storage unit and the first heat conducting member, the second connecting member is arranged between the valve arrangement surfaces of the power storage units arranged as even-numbered units from the one-end-side power storage unit toward the other-end-side power storage unit and the second heat conducting member.

2. The power storage device according to claim 1, wherein the first heat conducting member has: a first outer heat conducting element; and a first inner heat conducting element arranged between the first outer heat conducting element and each of the safety valves, the second heat conducting member has: a second outer heat conducting element; and a second inner heat conducting element arranged between the second outer heat conducting element and each of the safety valves, the first connecting member has: a first outer connecting element arranged between each of the power storage units arranged every three in the first direction and the first outer heat conducting element; and a first inner connecting element arranged between each of the power storage units other than the power storage units in contact with the first outer connecting element among the plurality of power storage units and the first inner heat conducting element arranged every three in the first direction, the second connecting member has: a second outer connecting element arranged between each of the power storage units arranged every three in the first direction and the second outer heat conducting element; and a second inner connecting element arranged between each of the power storage units other than the power storage units in contact with the second outer connecting element among the plurality of power storage units and the second inner heat conducting element arranged every three in the first direction. ​ ​ ​ ​ a second inner connecting member provided between each of the storage battery units other than the storage battery units in contact with the second outer connecting member and the second inner heat conducting member, and arranged every three in the first direction.

3. The power storage device according to claim 1, wherein the power storage device further comprises a cooler that cools the plurality of storage battery units, the valve arrangement surface is constituted by a lower surface of the unit case, the cooler is arranged above the unit case.

4. The power storage device according to claim 1 or 2, wherein the first connecting member and the second connecting member are constituted by a thermally conductive adhesive.

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