Power storage device

Abstract

To provide a power storage device capable of suppressing damage to a valve installation surface of a cell case, the valve installation surface including a safety valve.SOLUTION: A power storage device 10 includes at least one power storage cell and a cooler 200 for cooling the at least one power storage cell. The at least one power storage cell has a valve installation surface 121 including a safety valve SV. The cooler 200 is in thermal contact with the valve installation surface 121. The cooler 200 has a through hole h provided at a position facing the safety valve SV.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. The side of the case of each cell is provided with an external terminal and an explosion-proof valve. A module top plate with a cooling structure is disposed on the top surface of the cells. [Prior art documents] [Patent documents]

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

[0004] In the power battery pack described in JP 2022-525014 A, if a short circuit or the like occurs in any of the cells, high-temperature gas will leak from the explosion-proof valve of that cell. At this time, there is a concern that the side of the cell case, including the explosion-proof valve, will be damaged due to high heat, etc., and gas will leak from parts of the cell case other than the explosion-proof valve.

[0005] An object of the present disclosure is to provide an energy storage device that can suppress damage to a valve installation surface, including a safety valve, of a cell case. [Means for solving the problem]

[0006] A storage device according to one aspect of the present disclosure includes at least one storage cell and a cooler that cools the at least one storage cell, wherein the at least one storage cell has a valve mounting surface that includes a safety valve, the cooler is in thermal contact with the valve mounting surface, and the cooler has a through hole provided in a position opposite the safety valve. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an electricity storage device that can suppress damage to the valve installation surface of the cell case, including the safety valve. [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. 2 is a plan view schematically illustrating a cooler. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] FIG. 10 is a cross-sectional view schematically showing a modified example of the electricity storage device. [Figure 8] FIG. 10 is a cross-sectional view schematically showing a modified example of the electricity storage device. [Figure 9] FIG. 10 is a cross-sectional view schematically showing a modified example of the electricity storage device. 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 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.

[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. 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, a first cross frame 23, and a second cross frame 24.

[0013] The pair of first frames 21 face each other in a first direction. Each first frame 21 has a shape extending along a second direction that is perpendicular to both the first direction and the up-down direction. For example, the first direction may be a direction parallel to the front-to-rear direction of the vehicle 1, and the second direction may be a direction parallel to the left-to-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 first cross frame 23 is disposed between the pair of first frames 21 and connects the pair of second frames 22 to each other.

[0016] The second cross frame 24 is disposed between the pair of first frames 21 and connects the pair of second frames 22. The second cross frame 24 is spaced apart from the first cross frame 23 in the first direction. Each of the first cross frame 23 and the second cross frame 24 constitutes, for example, a seat cross.

[0017] The energy storage device 10 is attached to a frame member 20. As shown in Fig. 2, the energy storage device 10 is disposed below the first cross frame 23 and the second cross frame 24. As shown in Figs. 1 to 4, the energy storage device 10 includes four energy storage stacks 11 to 14, a cooler 200, a heat insulating plate 250, a housing 300, a reinforcing member 620, and an equipment unit 800. The number of energy storage stacks is not limited to four.

[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 plurality of (for example, 50) power storage cells 100 arranged side by side along a first direction. 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 a 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 an electrode assembly 110, a cell case 120, and a pair of external terminals .

[0021] The electrode assembly 110 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 110 is formed in a shape that is long in the second direction.

[0022] The cell case 120 houses the electrode assembly 110. The cell case 120 is formed in a rectangular parallelepiped shape. The cell case 120 is made of a metal such as aluminum. The cell case 120 includes a valve mounting surface 121 and a terminal mounting surface 122.

[0023] A safety valve SV is provided on the valve installation surface 121. In this embodiment, the valve installation surface 121 is formed by the lower surface of the cell casing 120. In Fig. 4, the discharge direction of gas that can be discharged from the safety valve SV is indicated by a two-dot chain line.

[0024] An external terminal 130 is provided on the terminal installation surface 122. In this embodiment, the terminal installation surface 122 is configured by a side surface of the cell case 120 in the second direction.

[0025] Each external terminal 130 is provided on a terminal installation surface 122 (a side surface in the second direction in this embodiment) of the cell casing 120. One of the pair of external terminals 130 is provided on the terminal installation surface 122 on one side of the cell casing 120 in the second direction. The other of the pair of external terminals 130 is provided on the terminal installation surface 122 on the other side of the cell casing 120 in the second direction.

[0026] The cooler 200 cools at least one energy storage cell 100. In this embodiment, the cooler 200 cools each of the energy storage stacks 11 to 14. A cooling medium (oil or the like) flows inside the cooler 200.

[0027] Fig. 5 is a plan view schematically showing the cooler. Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 5. As shown in Figs. 5 and 6, the cooler 200 has four cooling sections 210, a folded section 220, and a connecting section 230.

[0028] Each cooling section 210 has a shape that extends elongatedly in the first direction. Each cooling section 210 cools one energy storage stack. In FIG. 5, each energy storage stack 11 to 14 is indicated by a two-dot chain line. As shown in FIG. 4, each cooling section 210 is in thermal contact with the valve installation surface 121 of each energy storage cell 100. Each cooling section 210 is in thermal contact with the valve installation surface 121 of each energy storage cell 100 via a thermally conductive adhesive 910. The thermally conductive adhesive 910 extends along the first direction. In addition, being in thermal contact includes a mode in which the cooling section 210 is in direct contact with the valve installation surface 121 and a mode in which the cooling section 210 is in indirect contact with the valve installation surface 121 via a thermally conductive member (such as an adhesive or a fixing member). Each cooling section 210 may be formed by extrusion molding of a metal such as aluminum. As shown in FIGS. 4 and 5, each cooling section 210 has an upstream flow path 211 and a downstream flow path 212.

[0029] The upstream flow path 211 is provided on the upstream side in the flow direction of the cooling medium. The downstream flow path 212 is provided on the downstream side in the flow direction of the cooling medium. As shown in FIG. 5 , the upstream flow path 211 and the downstream flow path 212 have a shape that extends along a first direction. The upstream flow path 211 and the downstream flow path 212 are adjacent to each other in a second direction. The cooling medium flows through the upstream flow path 211 from one side to the other side in the first direction, and flows through the downstream flow path 212 from the other side to one side in the first direction.

[0030] As shown in Fig. 4 and Fig. 5, each cooling section 210 is provided with a plurality of through holes h. The plurality of through holes h are provided at intervals from one another in the first direction. Each through hole h is provided in a position of the cooling section 210 facing the safety valve SV of each energy storage cell 100. The number of through holes h is the same as the number of energy storage cells 100 in each energy storage stack. Each through hole h is provided in a portion of the cooling section 210 between the upstream flow path 211 and the downstream flow path 212. In this embodiment, each through hole h is provided in the center of the cooling section 210 in the second direction.

[0031] 4 and 5, of the four cooling sections 210, the two cooling sections 210 arranged outermost in the second direction have outer edge sections 213 and opposing edge sections 214. Of the four cooling sections 210, each cooling section 210 other than the two cooling sections 210 arranged outermost in the second direction has a pair of opposing edge sections 214.

[0032] The outer edge 213 is formed by the outer edge of the cooling unit 210 in the second direction. No space is formed in the outer edge 213 through which the cooling medium flows. The opposing edge 214 is formed by an edge that faces the cooling unit 210, which is arranged at a position opposite the opposing edge 214 in the second direction. No space is formed in the opposing edge 214 through which the cooling medium flows.

[0033] The turning portion 220 connects the downstream end of the upstream flow passage 211 and the upstream end of the downstream flow passage 212. Therefore, as shown by the arrows in Fig. 5, the cooling medium flows through the upstream flow passage 211, the turning portion 220, and the downstream flow passage 212 in this order.

[0034] The connecting portion 230 connects the four cooling portions 210 to one another. As shown in FIG.

[0035] The connecting portion main body 232 connects the four cooling portions 210 to one another. Therefore, the cooling media that have flowed through each downstream flow path 212 join together inside the connecting portion main body 232. The connecting portion main body 232 may be formed in a substantially rectangular parallelepiped shape.

[0036] The partition wall 234 divides the interior of the connecting portion main body 232 into two spaces. In this embodiment, as shown in FIG. 6, the partition wall 234 divides the interior of the connecting portion main body 232 into upper and lower halves. The upstream ends of the upstream flow paths 211 are connected to the space above the partition wall 234 in the connecting portion main body 232 (hereinafter referred to as the "upstream space S11"), and the downstream ends of the downstream flow paths 212 are connected to the space below the partition wall 234 in the connecting portion main body 232 (hereinafter referred to as the "downstream space S12"). Therefore, the cooling medium that flows into the upstream space S11 flows into each upstream flow path 211. The cooling medium that flows out of each downstream flow path 212 flows into the downstream space S12.

[0037] As shown in FIGS. 5 and 6, an inlet portion 236 and an outlet portion 238 are connected to the connecting portion 230.

[0038] The inlet portion 236 communicates between the upstream space S11 inside the connecting portion main body 232 and the outside of the connecting portion main body 232. Therefore, the cooling medium flows from the outside of the connecting portion main body 232 into the upstream space S11 inside the connecting portion main body 232 through the inlet portion 236. In this embodiment, the inlet portion 236 is connected to the upper surface of the connecting portion main body 232.

[0039] The outflow portion 238 communicates between the downstream space S12 in the connecting portion main body 232 and the outside of the connecting portion main body 232. Therefore, the cooling medium flows out from the downstream space S12 of the connecting portion main body 232 to the outside of the connecting portion main body 232 through the outflow portion 238. In this embodiment, the outflow portion 238 is connected to the upper part of the connecting portion main body 232 and the partition wall 234. Note that the cooling medium flowing out of the connecting portion main body 232 through the outflow portion 238 has a higher temperature than the cooling medium flowing into the connecting portion main body 232 through the inflow portion 236.

[0040] As shown in Fig. 4, the heat insulating plate 250 is disposed between the through hole h of the cooler 200 and the safety valve SV of the energy storage cell 100. The heat insulating plate 250 is placed on the cooling unit 210. The heat insulating plate 250 is made of, for example, mica, which is a natural inorganic mineral solidified by heat pressing. The heat insulating plate 250 has a shape that covers the through hole h. A notch may be formed in the portion of the heat insulating plate 250 that overlaps with the periphery of the through hole h.

[0041] The housing 300 houses at least one energy storage cell 100. In this embodiment, the housing 300 houses four energy storage stacks 11 to 14 and a cooler 200. As shown in FIG. 4 , the housing 300 has a lower case 310, an upper cover 320, a panel member 330, and a cross member 360.

[0042] The lower case 310 is open upward and has a bottom surface 312, a step portion 313, and a peripheral wall 314.

[0043] The bottom surface 312 is located below each of the power storage stacks 11 to 14. The bottom surface 312 may be formed in a flat plate shape. A smoke exhaust path S (see FIGS. 3 and 4) is formed between the bottom surface 312 and the cooler 200. More specifically, a smoke exhaust path S is formed between the bottom surface 312 and each cooling section 210. That is, in this embodiment, four smoke exhaust paths S are formed within the housing 300. Each smoke exhaust path S is connected to a common space within the housing 300 at an end of the smoke exhaust path S in the first direction. The smoke exhaust path S is a path for discharging gas discharged from the safety valve SV to the outside of the housing 300.

[0044] The step portion 313 is formed on the peripheral edge of the bottom surface 312. The step portion 313 is formed at a position higher than the bottom surface 312. As shown in FIG. 4 , the step portion 313 supports the outer edge portion 213 of the cooling portion 210 via an adhesive member 920.

[0045] Peripheral wall 314 stands up from the peripheral edge of step portion 313. Peripheral wall 314 has a shape that surrounds the lower part of each of power storage stacks 11-14.

[0046] As shown in FIG. 3, an explosion-proof valve 390 is provided in a portion of the peripheral wall 314 that faces the smoke exhaust path S in the first direction. The explosion-proof valve 390 is provided in the common space within the housing 300. The explosion-proof valve 390 releases pressure within the housing 300. The explosion-proof valve 390 opens when the pressure within the housing 300 reaches or exceeds a reference value. The explosion-proof valve 390 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 300 through the explosion-proof valve 390.

[0047] The upper cover 320, together with the lower case 310, houses the plurality of energy storage cells 100. In this embodiment, the upper cover 320, together with the lower case 310, houses the four energy storage stacks 11-14 and the cooler 200 in a sealed state. The upper cover 320 has an upper wall 322 formed above each of the energy storage stacks 11-14. A bead extending along the second direction may be formed on the upper wall 322. The peripheral edge of the upper cover 320 is connected to the peripheral edge of the lower case 310 by bolts or the like via a sealing member.

[0048] The panel member 330 is provided below the lower case 310. The panel member 330 has a function of protecting the lower case 310. The panel member 330 may be formed in a flat plate shape. As shown in FIG. 4 , the peripheral edge of the panel member 330 is connected to the lower case 310 via a bracket 80.

[0049] The bottom surface 312 and the panel member 330 of the lower case 310 are located below the plurality of energy storage cells 100. A smoke exhaust path S is formed between the bottom surface 312 and the panel member 330 and the cooler 200. That is, in this embodiment, the bottom surface 312 and the panel member 330 form a "bottom wall 350."

[0050] The cross member 360 is connected to a portion of the bottom surface 312 of the lower case 310 between a pair of adjacent power storage stacks. For example, FIG. 4 shows the cross member 360 connected to a portion of the bottom surface 312 between a plurality of first power storage cells 101 (see FIG. 4) included in the power storage stack 11 arranged outermost in the second direction and a plurality of second power storage cells 102 (see FIG. 4) included in the power storage stack 12 adjacent to the power storage stack 11. The cross member 360 extends along the first direction. The cross member 360 is connected to the peripheral wall 314. The cross member 360 may be connected to the pair of first frames 21 via brackets (not shown).

[0051] As shown in FIG. 4, the cross member 360 has a reinforcing portion 362 , a connecting bottom surface 364 , and a supporting portion 366 .

[0052] The reinforcing portion 362 has a shape that is convex in a direction away from the bottom surface 312. The reinforcing portion 362 is disposed below the external terminals 130 of the energy storage cell 100. The reinforcing portion 362 overlaps in the up-down direction with both of a pair of external terminals 130 that face each other in the second direction.

[0053] The connecting bottom surface 364 extends outward in the second direction from the lower end of the reinforcing portion 362. The connecting bottom surface 364 is connected to the bottom surface 312 of the lower case 310 by welding or the like. The connecting bottom surface 364 is formed flat.

[0054] The support portion 366 extends outward in the second direction from the connecting bottom surface 364. The support portion 366 is spaced upward from the bottom surface 312 of the lower case 310. The support portion 366 is formed flat. The support portion 366 supports the cooler 200. Specifically, the support portion 366 supports the opposing edge portions 214 of each cooling portion 210 via adhesive members 920. The support portion 366 forms a smoke exhaust path S together with the cooler 200 and the bottom surface 312 of the lower case 310.

[0055] 3 and 4, reinforcing member 620 is disposed on upper cover 320. More specifically, reinforcing member 620 is placed on upper wall 322. Reinforcing member 620 has a function of dispersing a load that is locally applied from above to power storage device 10 by an occupant of vehicle 1.

[0056] 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 upper cover 320 in the front-rear 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 first cooler 822, a second cooler 824, and an equipment cover 830.

[0057] The junction box 812 is disposed above the upper cover 320. The junction box 812 houses a relay, a fuse, etc. The junction box 812 is cooled by a first cooler 822 disposed between the junction box 812 and the upper cover 320.

[0058] The power supply unit 814 is disposed above the junction box 812. The power supply unit 814 is cooled by a second 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 second cooler 824 .

[0061] In the energy storage device 10 described above, when gas is discharged from the safety valve SV due to a short circuit or the like in any of the energy storage cells 100, the gas destroys the heat insulating plate 250 and flows into the smoke exhaust path S. That is, in the energy storage device 10 of this embodiment, the cooler 200 has the through-hole h, which prevents damage to the cooler 200 caused by gas flowing out from the safety valve SV of the energy storage cell 100 coming into contact with the cooler 200. Furthermore, because the valve installation surface 121 of the energy storage cell 100 is cooled by the cooler 200, damage to the valve installation surface 121 when gas flows out from the safety valve SV is prevented.

[0062] The gas that has flowed into the smoke exhaust path S spreads in a first direction and is discharged from the housing 300 through the explosion-proof valve 390 as shown in Fig. 3. At this time, the gas spreading in the first direction through the smoke exhaust path S is cooled by the cooling unit 210 of the cooler 200. Furthermore, since each of the through-holes h provided at a position facing the safety valve SV of the other energy storage cells 100 different from the energy storage cell 100 that has discharged the gas is blocked by the heat insulating plate 250, the gas spreading through the smoke exhaust path S is prevented from coming into contact with the valve installation surface 121 of the other energy storage cell 100. Therefore, the energy storage cells 100 other than the energy storage cell 100 that has discharged the gas are prevented from being heated by the gas.

[0063] Modifications of the above embodiment will now be described.

[0064] <First Modification> 7, the energy storage device 10 may further include a heat insulating member 700 made of a heat insulating material. The heat insulating member 700 is disposed in the smoke exhaust path S. The heat insulating member 700 is disposed so as to be in contact with the lower surface of the cooler 200. The heat insulating member 700 has a first contact portion 711, a second contact portion 712, and an interposed portion 713.

[0065] The first contact portion 711 contacts the lower surface of the upstream flow path 211 of each cooling portion 210. The second contact portion 712 contacts the lower surface of the downstream flow path 212 of each cooling portion 210.

[0066] The interposed portion 713 is interposed between the lower surface of the cooler 200 and the bottom surface 312 of the lower case 310. The interposed portion 713 connects the inner end of the first contact portion 711 and the inner end of the second contact portion 712 in the second direction.

[0067] The power storage device 10 may further include at least one water absorbing member 750. In the example shown in Fig. 7, the at least one water absorbing member 750 includes two water absorbing members 750. One water absorbing member 750 is disposed below the first contact portion 711. The other water absorbing member 750 is disposed below the second contact portion 712.

[0068] <Second Modification> 8, the cooler 200 may be disposed between the bottom surface 312 of the lower case 310 and the panel member 330. In this example, a smoke exhaust path S is formed between the bottom surface 312 and the panel member 330. That is, in this example, only the panel member 330 constitutes the "bottom wall." In this example, water, for example, may be used as the cooling medium.

[0069] The bottom surface 312 of the lower case 310 has a first bottom surface 312a, a second bottom surface 312b, and an intermediate bottom surface 312c.

[0070] The first bottom surface 312a is connected to the upstream flow path 211 via a thermally conductive adhesive 910. The first bottom surface 312a is connected to the valve installation surface 121 of the energy storage cell 100 via the thermally conductive adhesive 910. In other words, the energy storage cell 100 is in thermal contact with the upstream flow path 211 via the thermally conductive adhesive 910. The first bottom surface 312a is formed flat.

[0071] The second bottom surface 312b is connected to the downstream flow path 212 via a thermally conductive adhesive 910. The second bottom surface 312b is connected to the valve installation surface 121 of the energy storage cell 100 via the thermally conductive adhesive 910. In other words, the energy storage cell 100 is in thermal contact with the downstream flow path 212 via the thermally conductive adhesive 910. The second bottom surface 312b is formed flat.

[0072] The intermediate bottom surface 312c connects the first bottom surface 312a and the second bottom surface 312b. An opening 312h is provided in the intermediate bottom surface 312c at a location facing the safety valve SV. A heat insulating plate 250 is placed on the intermediate bottom surface 312c to close the opening 312h.

[0073] A heat insulating plate 251 may be provided on the panel member 330 at a location facing the safety valve SV.

[0074] <Third Modification> 9, the upper surface of the cell casing 120 may form the valve mounting surface 121. In this case, the cooler 200 is in thermal contact with the upper surface of each energy storage cell 100 via a thermally conductive adhesive 910.

[0075] The pair of external terminals 130 may also be provided on the upper surface of the cell casing 120. In other words, the upper surface of the cell casing 120 may constitute both the valve mounting surface 121 and the terminal mounting surface 122.

[0076] In this example, a heat insulating plate 251 is provided on the lower surface of the upper wall 322. A bottom plate 500 is provided on the bottom surface 312 of the lower case 310. Each energy storage cell 100 is supported on the bottom plate 500 via an adhesive member 920.

[0077] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0078] [Aspect 1] at least one storage cell; a cooler that cools the at least one energy storage cell, the at least one storage cell has a valve mounting surface including a safety valve; the cooler is in thermal contact with the valve mounting surface; The cooler has a through hole provided at a position opposite the safety valve.

[0079] In this energy storage device, the cooler has a through hole, which prevents damage to the cooler caused by gas flowing out of the safety valve of the energy storage cell coming into contact with the cooler.Furthermore, the valve installation surface of the energy storage cell is cooled by the cooler, which prevents damage to the valve installation surface when gas flows out of the safety valve.

[0080] [Aspect 2] The at least one storage cell is An electrode body; a cell case that accommodates the electrode assembly and includes the valve installation surface; an external terminal electrically connected to the electrode body and provided outside the cell casing; 2. The power storage device according to aspect 1, wherein the external terminal is provided on a surface of the cell case that is different from the valve installation surface.

[0081] In this aspect, the safety valve and the external terminal are provided on different surfaces of the cell case, so that the external terminal is prevented from becoming too hot when gas is discharged from the safety valve.

[0082] [Aspect 3] Further comprising a housing that houses the at least one power storage cell; the at least one storage cell includes a plurality of storage cells; the valve installation surface of each of the energy storage cells is formed by a lower surface of the cell case, the housing includes a bottom wall located below the plurality of power storage cells, 3. The power storage device according to claim 2, wherein a smoke exhaust path is formed between the cooler and the bottom wall.

[0083] In this embodiment, the gas flowing out from the safety valve of each storage cell is cooled by the cooler.

[0084] [Aspect 4] The housing includes: a lower case that opens upward; an upper cover that houses the plurality of power storage cells together with the lower case, the lower case includes a bottom surface, 4. The power storage device according to aspect 3, wherein the smoke exhaust path is formed between the cooler and the bottom surface of the lower case.

[0085] [Aspect 5] The plurality of storage cells include a plurality of first storage cells arranged in a line along a first direction; a plurality of second storage cells that face the plurality of first storage cells in a second direction that is orthogonal to both the first direction and the up-and-down direction and are arranged side by side along the first direction, the housing further includes a cross member connected to a portion of the bottom surface of the lower case between the plurality of first storage cells and the plurality of second storage cells and extending along the first direction, the cross member has a support portion that supports the cooler, The power storage device according to aspect 4, wherein the support portion, together with the cooler and the bottom surface of the lower case, defines the smoke exhaust space.

[0086] In this embodiment, the number of parts is reduced compared to when the cooler is supported by a dedicated support member.

[0087] [Aspect 6] The cooling device further includes a heat insulating member made of a heat insulating material and arranged to contact the lower surface of the cooling device. 6. The power storage device according to aspect 4 or 5, wherein the heat insulating member includes an interposition portion interposed between the lower surface of the cooler and the bottom surface of the lower case.

[0088] In this embodiment, condensation in the cooler is suppressed, and further, an external force acting upward on the bottom wall is transmitted to the cooler via the interposition portion, thereby dispersing the external force effectively.

[0089] [Aspect 7] 7. The power storage device according to claim 6, further comprising: a water absorbing member provided between the heat insulating member and the bottom surface of the lower case.

[0090] In this embodiment, water is prevented from accumulating in the smoke exhaust space.

[0091] 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]

[0092] REFERENCE SIGNS LIST 1 vehicle, 10 energy storage device, 11 to 14 energy storage stack, 20 frame member, 21 first frame, 22 second frame, 23 first cross frame, 24 second cross frame, 51 end plate, 52 monitoring unit, 100 energy storage cell, 101 first energy storage cell, 102 second energy storage cell, 110 electrode body, 120 cell case, 121 valve installation surface, 122 terminal installation surface, 130 external terminal, 200 cooler, 210 cooling section, 211 upstream flow path, 212 downstream flow path, 213 outer edge portion, 214 opposing edge portion, 220 folded portion, 230 connecting portion, 232 connecting portion main body, 234 partition wall, 236 inlet portion, 238 outlet portion, 250 heat insulating plate, 251 heat insulating plate, 300 housing, 310 Lower case, 312 bottom surface, 313 stepped portion, 314 peripheral wall, 320 upper cover, 322 top wall, 330 panel member, 350 bottom wall, 360 cross member, 362 reinforcing portion, 364 connecting bottom surface, 366 support portion, 390 explosion-proof valve, 500 bottom plate, 620 reinforcing member, 700 heat insulating member, 711 first contact portion, 712 second contact portion, 713 interposition portion, 750 water absorption member, 800 equipment unit, 812 junction box, 814 power supply unit, 816 electronic control unit, 822 first cooler, 824 second cooler, 830 equipment cover, 910 thermally conductive adhesive, 920 adhesive member, h through hole, S smoke exhaust path, SV safety valve.

Claims

1. at least one storage cell; a cooler that cools the at least one power storage cell, the at least one storage cell has a valve mounting surface including a safety valve; the cooler is in thermal contact with the valve mounting surface; The cooler has a through hole provided at a position opposite the safety valve.

2. The at least one storage cell is An electrode body; a cell case that accommodates the electrode assembly and includes the valve installation surface; an external terminal electrically connected to the electrode body and provided outside the cell casing; The power storage device according to claim 1 , wherein the external terminal is provided on a surface of the cell case that is different from the valve installation surface.

3. Further comprising a housing that houses the at least one power storage cell; the at least one storage cell includes a plurality of storage cells; the valve installation surface of each of the energy storage cells is formed by a lower surface of the cell case, the housing includes a bottom wall located below the plurality of power storage cells, The electricity storage device according to claim 2 , wherein a smoke exhaust path is formed between the cooler and the bottom wall.

4. The housing includes: a lower case that opens upward; an upper cover that houses the plurality of power storage cells together with the lower case, the lower case includes a bottom surface, The power storage device according to claim 3 , wherein the smoke exhaust path is formed between the cooler and the bottom surface of the lower case.

5. The plurality of storage cells are a plurality of first storage cells arranged to be aligned along a first direction; a plurality of second storage cells that face the plurality of first storage cells in a second direction that is orthogonal to both the first direction and the up-and-down direction and are arranged side by side along the first direction, the housing further includes a cross member connected to a portion of the bottom surface of the lower case between the plurality of first storage cells and the plurality of second storage cells and extending along the first direction, the cross member has a support portion that supports the cooler, The power storage device according to claim 4 , wherein the support portion forms the smoke exhaust path together with the cooler and the bottom surface of the lower case.

6. The cooling device further includes a heat insulating member made of a heat insulating material and arranged to contact the lower surface of the cooling device. The power storage device according to claim 4 , wherein the heat insulating member includes an interposition portion interposed between the lower surface of the cooler and the bottom surface of the lower case.

7. The power storage device according to claim 6 , further comprising a water absorbing member provided between the heat insulating member and the bottom surface of the lower case.

Images