Power storage device

Abstract

To provide a power storage device capable of suppressing damage to a valve installation surface including a safety valve of a cell case.SOLUTION: A power storage device 10 includes: at least one power storage cell including a safety valve SV on a lower surface; a lower case 310 including a bottom surface 312 positioned below the at least one power storage cell; and a space forming member 340 provided between the bottom surface of the lower case and the at least one power storage cell and forming a space S together with the bottom surface of the lower case, the space forming member 340 having a through hole 343h provided below 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 escape from the explosion-proof valve of that cell, and there is a concern that the contents of the cell (so-called debris) will be expelled through the explosion-proof valve and adhere to the external terminals, etc.

[0005] An object of the present disclosure is to provide an electricity storage device that can prevent substances contained in the electricity storage cells, which are contained in the gas discharged from the safety valve SV, from adhering to the electricity storage cells. [Means for solving the problem]

[0006] An energy storage device according to one aspect of the present disclosure includes at least one energy storage cell including a safety valve arranged on its underside, a lower case including a bottom surface located below the at least one energy storage cell, and a space-forming member provided between the bottom surface of the lower case and the at least one energy storage cell, the space-forming member forming a space together with the bottom surface of the lower case, the space-forming member having a through hole provided below the safety valve. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an electricity storage device that can prevent substances contained in the electricity storage cells, which are contained in the gas discharged from the safety valve SV, from adhering to the 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 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 space forming member. [Figure 8] FIG. 8 is a perspective view schematically showing the space forming member shown in FIG. 7. [Figure 9] FIG. 10 is a cross-sectional view schematically showing a modified example of the space forming member. [Figure 10] FIG. 10 is a perspective view schematically showing the space forming member shown in FIG. 9. [Figure 11] 10 is a cross-sectional view that schematically shows an electricity storage device that includes the space forming member shown in FIG. [Figure 12]FIG. 10 is a cross-sectional view schematically showing a modified example of the electricity storage device. [Figure 13] FIG. 10 is a cross-sectional view schematically showing a modified example of the space forming member. [Figure 14] FIG. 14 is a perspective view schematically showing the space forming member shown in FIG. 13. 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 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 case 120. That is, the safety valve SV is provided on the lower surface of the cell case 120 in the energy storage cell 100. Note that 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, a through hole h is provided in each cooling section 210. The through hole h extends in the first direction. The through hole h is provided in a position of the cooling section 210 facing the safety valve SV of each energy storage cell 100. Note that the same number of through holes h as the number of energy storage cells 100 in each energy storage stack may be provided in the cooling section 210. The 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, the through hole h is provided in the center of the cooling section 210 in the second direction.

[0031] 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.

[0032] The connecting portion 230 connects the four cooling portions 210 to one another. As shown in FIG.

[0033] 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.

[0034] 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.

[0035] As shown in FIGS. 5 and 6, an inlet portion 236 and an outlet portion 238 are connected to the connecting portion 230.

[0036] 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.

[0037] 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.

[0038] 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, a space forming member 340, a protective plate 350, and a cross member 360.

[0039] The lower case 310 is open upward and has a bottom surface 312 and a peripheral wall 314.

[0040] 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.

[0041] Peripheral wall 314 stands upright from the peripheral edge of bottom surface 312. Peripheral wall 314 has a shape that surrounds the lower part of each of power storage stacks 11-14.

[0042] 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.

[0043] The panel member 330 is provided below the lower case 310. The panel member 330 is joined to the lower surface of the bottom surface 312. 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.

[0044] The space forming member 340 forms a space S (see FIGS. 3 and 4) together with the bottom surface 312 of the lower case 310. The space forming member 340 is provided between the bottom surface 312 of the lower case 310 and at least one energy storage cell 100. Specifically, the space forming member 340 is provided between the bottom surface 312 and each of the energy storage stacks 11 to 14. That is, in this embodiment, four spaces S are formed inside the housing 300. Note that the space forming member 340 and the lower case 310 may be formed integrally.

[0045] 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 to the outside of the housing 300. Each smoke exhaust path S is connected to a common space within the housing 300 at the end of the smoke exhaust path S in the first direction.

[0046] The space forming member 340 has through holes 343h provided below the safety valves SV. When gas is discharged from the safety valves SV of the energy storage cells 100, the gas flows into the smoke exhaust path S through the through holes 343h. In this embodiment, the through holes 343h are provided in the space forming member 340 at positions facing the respective safety valves SV.

[0047] 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.

[0048] As shown in FIG. 4, the space forming member 340 has a base portion 341 , a support portion 342 , and a connecting portion 343 .

[0049] The base portion 341 is connected to the bottom surface 312 of the lower case 310 by welding or the like. The base portion 341 is formed flat.

[0050] The support portion 342 protrudes from the base portion 341. The support portion 342 supports the cooler 200. That is, the cooler 200 is disposed between the lower surface of the cell case 120 and the space forming member 340. The support portion 342 has a first support portion 342a and a second support portion 342b.

[0051] The first support portion 342a supports the upstream flow path 211. More specifically, the first support portion 342a supports the upstream flow path 211 via an adhesive member 920. The first support portion 342a is formed in a flat plate shape.

[0052] The second support portion 342b supports the downstream flow path 212. More specifically, the second support portion 342b supports the downstream flow path 212 via an adhesive member 920. The second support portion 342b is formed in a flat plate shape.

[0053] The connecting portion 343 connects the first support portion 342a and the second support portion 342b. In this embodiment, the connecting portion 343 protrudes from the first support portion 342a and the second support portion 342b. As shown in FIG. 4, the connecting portion 343 is located within a through-hole h of the cooler 200. In other words, the connecting portion 343 overlaps with the upstream flow path 211 and the downstream flow path 212 in the second direction. A through-hole 343h is provided in a portion of the connecting portion 343 facing the safety valve SV.

[0054] As shown in Fig. 4, a heat insulating plate 250 may be placed on the connecting portion 343. The heat insulating plate 250 is provided between each through hole 343h of the space forming member 340 and the safety valve SV of the energy storage cell 100. Each heat insulating plate 250 is made of, for example, mica, which is a natural inorganic mineral solidified by heat pressing. Each heat insulating plate 250 has a shape that covers the through hole 343h. A notch may be formed in each heat insulating plate 250 at a portion that overlaps the edge of the through hole 343h.

[0055] The protective plate 350 is disposed on the bottom surface 312 of the lower case 310. The protective plate 350 receives the blast discharged from the safety valve SV. The protective plate 350 is made of, for example, mica, which is a natural inorganic mineral solidified by heat pressing.

[0056] The cross member 360 is connected by welding or the like to a portion of the base 341 between a pair of adjacent power storage stacks. For example, FIG. 4 shows a cross member 360 connected to the base 341 provided at a portion 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).

[0057] As shown in FIG. 4, the cross member 360 has a reinforcing portion 362 and a connecting bottom surface 364 .

[0058] The reinforcing portion 362 has a shape that is convex in a direction away from the base portion 341. 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.

[0059] The connection bottom surface 364 extends outward in the second direction from the lower end of the reinforcing portion 362. The connection bottom surface 364 is connected to the base portion 341 by welding or the like. The connection bottom surface 364 is formed flat.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] The electronic control unit 816 is disposed above the junction box 812 .

[0065] The equipment cover 830 houses the junction box 812 , the power supply unit 814 , the electronic control unit 816 , and the second cooler 824 .

[0066] 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 destroys the heat insulating plate 250 and flows into the smoke exhaust path S through the through-hole 343h. This prevents the contents of the energy storage cells 100 (so-called debris) contained in the gas from adhering to the external terminals 130 of the energy storage cells 100, etc.

[0067] Furthermore, since the valve mounting surface 121 of the energy storage cell 100 is cooled by the cooler 200, damage to the valve mounting surface 121 when gas flows out from the safety valve SV is suppressed.

[0068] Then, 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. Here, each of the through-holes 343h 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, and therefore 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 cells 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.

[0069] Furthermore, since the heat insulating plate 250 is placed on the connecting portion 343 that protrudes from the first support portion 342a and the second support portion 342b, the distance between the safety valve SV and the heat insulating plate 250 is small. Therefore, the blast discharged from the safety valve SV of one energy storage cell 100 is prevented from bouncing off the heat insulating plate 250 and heading toward the safety valve SV of the energy storage cell 100 adjacent to the one energy storage cell 100.

[0070] Modifications of the above embodiment will now be described.

[0071] <First Modification> 7 and 8, the connecting portion 343 of the space forming member 340 may be configured as a recess (hereinafter referred to as "recess 343") recessed downward from the support portion 342. The recess 343 forms a single space extending in the first direction (the arrangement direction of the plurality of storage cells 100) between the recess 343 and the plurality of energy storage cells 100. The recess 343 includes a receiving portion 344 and a connecting surface 345.

[0072] The receiving portion 344 receives the blast discharged from the safety valve SV. The receiving portion 344 is disposed between the safety valve SV and the bottom surface 312 of the lower case 310. The receiving portion 344 is spaced upward from the bottom surface 312. The receiving portion 344 has a shape that extends in the first direction. The receiving portion 344 is formed in a flat plate shape.

[0073] The connecting surface 345 connects the edge of the receiving portion 344 in the second direction (the direction perpendicular to both the arrangement direction and the up-down direction) to the support portion 342. Each through hole 343h is provided in the connecting surface 345.

[0074] In this example, the heat insulating plate 250 is attached to the lower surface of the cell case 120 so as to cover the safety valve SV. This prevents the blast discharged from the safety valve SV of one energy storage cell 100 from bouncing off the receiving portion 344 or the like and coming into contact with the safety valve SV of the energy storage cell 100 adjacent to the one energy storage cell 100.

[0075] <Second Modification> 9 to 11, the connecting portion 343 of the space forming member 340 may include a plurality of recesses 346. The plurality of recesses 346 are formed to be aligned at intervals along the first direction. Each recess 346 is provided in a position facing the safety valve SV. Each recess 346 has a receiving portion 344 and a connecting surface 345.

[0076] The receiving portion 344 receives the blast discharged from the safety valve SV. The receiving portion 344 is disposed between the safety valve SV and the bottom surface 312 of the lower case 310. The receiving portion 344 is spaced upward from the bottom surface 312. The receiving portion 344 is formed in a flat plate shape.

[0077] The connecting surface 345 connects the edge of the receiving portion 344 in the second direction to the support portion 342. Each through-hole 343h opens in a direction parallel to the arrangement direction of the plurality of energy storage cells 100 (first direction).

[0078] In this example as well, the heat insulating plate 250 is attached to the lower surface of the cell casing 120 so as to cover the safety valve SV.

[0079] <Third Modification> 12, the housing 300 may further include a support member 370 that is provided between the receiving portion 344 and the bottom surface 312 of the lower case 310 and supports the receiving portion 344. The support member 370 prevents the support portion 342 from bending toward the bottom surface 312 due to a load acting on the support portion 342 via a thermally conductive adhesive 910 or the like. The support member 370 includes an elastic member 371. The support member 370 has a buffering function that prevents the support portion 342 and the recessed portion 343 from being displaced (vibrated) relative to the bottom surface 312 due to vibration or the like.

[0080] In this embodiment, deformation of the support portion 342 and relative displacement between the support portion 342 and the recessed portion 343 are suppressed.

[0081] In this example as well, the heat insulating plate 250 is attached to the lower surface of the cell casing 120 so as to cover the safety valve SV.

[0082] <Fourth Modification> 13 and 14, the space forming member 340 may further include a seating portion 347 that is recessed from the receiving portion 344 toward the bottom surface 312 of the lower case 310 and that comes into contact with the bottom surface 312. The seating portion 347 is connected to the bottom surface 312 by welding or the like.

[0083] The seating portion 347 is provided at a position where it does not come into contact with the blast heading toward the smoke exhaust path S through the through holes 343h. The seating portion 347 is formed at the boundary between the receiving portion 344 and the connecting surface 345. The seating portion 347 is formed at a portion of the receiving portion 344 that is located between a pair of through holes 343h that are adjacent to each other in the first direction. In this example, a plurality of seating portions 347 formed at the boundary between the connecting surface 345 and an edge on one side of the receiving portion 344 in the second direction, and a plurality of seating portions 347 formed at the boundary between the connecting surface 345 and an edge on the other side of the receiving portion 344 in the second direction, are arranged alternately in the first direction.

[0084] In this embodiment, the receiving portion 344 is supported by the seating portion 347, so that deformation of the support portion 342 and relative displacement between the support portion 342 and the recessed portion 343 are suppressed.

[0085] In this example as well, the heat insulating plate 250 is attached to the lower surface of the cell casing 120 so as to cover the safety valve SV.

[0086] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0087] [Aspect 1] At least one storage cell including a safety valve disposed on a lower surface thereof; a lower case including a bottom surface located below the at least one storage cell; a space forming member provided between the bottom surface of the lower case and the at least one power storage cell, the space forming member forming a space together with the bottom surface of the lower case, The space forming member has a through hole provided below the safety valve.

[0088] In this energy storage device, gas discharged downward from the safety valve of the energy storage cell flows through the through hole into the space formed between the bottom surface of the lower case and the space-forming member, thereby preventing the contents of the energy storage cell (so-called debris) contained in the gas from adhering to the energy storage cell.

[0089] [Aspect 2] an upper cover that houses, together with the lower case, the at least one power storage cell; a cooler that cools the at least one power storage cell, the at least one storage cell includes a plurality of storage cells; Each of the storage cells is An electrode body; a cell case that accommodates the electrode assembly; an external terminal electrically connected to the electrode body and provided outside the cell casing; the safety valve is provided on the lower surface of the cell casing, 2. The power storage device according to claim 1, wherein the cooler is disposed between the lower surface of the cell case and the space forming member.

[0090] In this aspect, the lower surface of the storage cell, i.e., the surface on which the safety valve is provided, is cooled by the cooler, so that damage to the lower surface when gas flows out from the safety valve is suppressed.

[0091] [Aspect 3] The power storage device according to aspect 1 or 2, further comprising: a protective plate disposed on the bottom surface of the lower case and configured to receive blast discharged from the safety valve.

[0092] In this aspect, the protection plate receives the blast, so damage to the bottom surface of the lower case caused by the impact of the blast is suppressed.

[0093] [Aspect 4] The energy storage device according to aspect 1 or 2, wherein the space forming member includes a receiving portion disposed between the safety valve and the bottom surface of the lower case, the receiving portion receiving the blast discharged from the safety valve.

[0094] In this embodiment, the receiving portion receives the blast, thereby suppressing damage to the bottom surface of the lower case due to the impact of the blast. Furthermore, because a part of the space-forming member constitutes the receiving portion, the number of parts is reduced compared to when a dedicated member is provided for receiving the blast.

[0095] [Aspect 5] The space forming member is a support portion that supports the cooler; a recess that is recessed downward from the support portion and includes the receiving portion.

[0096] In this embodiment, the blast is received at a position recessed downward from the support portion that supports the cooler, thereby preventing the blast from coming into contact with the cooler.

[0097] [Aspect 6] the recess forms a single space between the recess and the plurality of storage cells, the space extending in an arrangement direction of the plurality of storage cells, the recess further has a connecting surface that connects an edge of the receiving portion and the support portion in an orthogonal direction that is orthogonal to both the arrangement direction and the up-down direction, 6. The power storage device according to aspect 5, wherein the through-hole is provided in the connecting surface.

[0098] [Aspect 7] 6. The power storage device according to aspect 5, wherein the through-holes are open in a direction parallel to an arrangement direction of the plurality of power storage cells.

[0099] [Aspect 8] The power storage device according to any one of aspects 4 to 7, further comprising a support member provided between the receiving portion and the bottom surface of the lower case, the support member supporting the receiving portion.

[0100] In this aspect, the receiving portion is supported by the support member, so deformation of the support portion is suppressed.

[0101] [Aspect 9] Aspect 8. The power storage device according to any one of aspects 4 to 7, wherein the space forming member further includes a seat portion recessed from the receiving portion toward the bottom surface of the lower case and in contact with the bottom surface.

[0102] In this aspect, the receiving portion is supported by the seating portion, so deformation of the support portion is suppressed.

[0103] [Aspect 10] 10. The power storage device of any one of aspects 1 to 9, further comprising a panel member joined to the bottom surface of the lower case.

[0104] In this embodiment, damage to the bottom surface of the lower case is suppressed.

[0105] 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]

[0106] 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, 220 folded section, 230 connection section, 232 connection section main body, 234 partition wall, 236 inlet section, 238 outlet section, 250 heat insulating plate, 300 housing, 310 lower case, 312 bottom surface, 314 peripheral wall, 320 upper cover, 322 Upper wall, 330 panel member, 340 space forming member, 341 base, 342 support portion, 342a first support portion, 342b second support portion, 343 connecting portion (recess), 343h through hole, 344 receiving portion, 345 connecting surface, 346 recess, 347 seating portion, 350 protective plate, 360 cross member, 362 reinforcing portion, 364 connecting bottom surface, 370 support member, 371 elastic member, 390 explosion-proof valve, 620 reinforcing 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 space (smoke exhaust route), SV safety valve.

Claims

1. At least one storage cell including a safety valve disposed on a lower surface thereof; a lower case including a bottom surface located below the at least one storage cell; a space forming member provided between the bottom surface of the lower case and the at least one power storage cell, the space forming member forming a space together with the bottom surface of the lower case, The space forming member has a through hole provided below the safety valve.

2. an upper cover that houses, together with the lower case, the at least one power storage cell; a cooler that cools the at least one power storage cell, the at least one storage cell includes a plurality of storage cells; Each of the storage cells is An electrode body; a cell case that accommodates the electrode assembly; an external terminal electrically connected to the electrode body and provided outside the cell casing; the safety valve is provided on the lower surface of the cell casing, The power storage device according to claim 1 , wherein the cooler is disposed between the lower surface of the cell case and the space forming member.

3. The electricity storage device according to claim 1 , further comprising a protection plate disposed on the bottom surface of the lower case and configured to receive the blast discharged from the safety valve.

4. The power storage device according to claim 2 , wherein the space forming member is disposed between the safety valve and the bottom surface of the lower case, and includes a receiving portion that receives the blast discharged from the safety valve.

5. The space forming member is a support portion that supports the cooler; The power storage device according to claim 4 , further comprising: a recess that is recessed downward from the support portion and includes the receiving portion.

6. the recess forms a single space between the recess and the plurality of storage cells, the space extending in an arrangement direction of the plurality of storage cells, the recess further has a connecting surface that connects an edge of the receiving portion and the support portion in an orthogonal direction that is orthogonal to both the arrangement direction and the up-down direction, The power storage device according to claim 5 , wherein the through-hole is provided in the connecting surface.

7. The power storage device according to claim 5 , wherein the through-holes are open in a direction parallel to an arrangement direction of the plurality of power storage cells.

8. The power storage device according to claim 4 , further comprising a support member provided between the receiving portion and the bottom surface of the lower case, the support member supporting the receiving portion.

9. The power storage device according to claim 4 , wherein the space forming member further includes a seat portion recessed from the receiving portion toward the bottom surface of the lower case and in contact with the bottom surface.

10. The power storage device according to claim 1 , further comprising a panel member joined to the bottom surface of the lower case.

Images