Power storage device

Abstract

To provide a power storage device in which bottom part can be replaced.SOLUTION: A power storage device 10 includes: at least one power-storage cell 100 including a safety valve SV arranged on a lower surface; a lower case 310 including a bottom surface 312 located below the at least one power-storage cell; a structural member 340 fixed to the lower case; a space-forming member 350 fixed to the structural member and forming a space S together with the bottom surface of the lower case; and fastening members B1 and B2 for fastening the space-forming member to the structural member. The space-forming member 350 has a through hole 354h 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-A-2024-502583 discloses a battery pack including a battery stack, a tray that houses the battery stack, and a bottom structural adhesive provided between the tray and the battery stack. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2024-502583 Summary of the Invention [Problem to be solved by the invention]

[0004] In a battery pack such as that described in JP-A-2024-502583, the bottom portion of the housing is susceptible to external force input from below, and therefore it is desirable that the bottom portion be replaceable.

[0005] An object of the present disclosure is to provide an electricity storage device whose bottom portion is replaceable. [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, a structural member fixed to the lower case, a space-forming member fixed to the structural member and forming a space together with the bottom surface of the lower case, and a fastening member fastening the space-forming member to the structural member, wherein the space-forming member has a through hole provided below the safety valve.

[0007] According to another aspect of the present disclosure, there is provided an energy storage device comprising: at least one energy storage cell including a safety valve arranged on an underside thereof; a lower case including a bottom surface located below the at least one energy storage cell; a panel member provided below the bottom surface of the lower case, the panel member forming a space between the panel member and the bottom surface of the lower case; and a fastening member fastening the panel member to the lower case, wherein the bottom surface of the lower case has an opening provided below the safety valve. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide an electricity storage device whose bottom portion is replaceable. [Brief explanation of the drawings]

[0009] [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. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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.

[0011] 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.

[0012] 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).

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] As shown in FIG. 4, each storage cell 100 has an electrode assembly 110, a cell case 120, and a pair of external terminals .

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The connecting portion 230 connects the four cooling portions 210 to one another. As shown in FIG.

[0034] 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.

[0035] 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.

[0036] As shown in FIGS. 5 and 6, an inlet portion 236 and an outlet portion 238 are connected to the connecting portion 230.

[0037] 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.

[0038] 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.

[0039] 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 structural member 340, a space forming member 350, and fastening members B1 and B2.

[0040] The lower case 310 is open upward and has a bottom surface 312 and a peripheral wall 314.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] The structural member 340 is fixed to the lower case 310. The structural member 340 is used to attach the space forming member 350 to the lower case 310. The structural member 340 has a first pedestal 340A and a second pedestal 340B.

[0046] The first seat 340A is provided on one side of the through hole h in the second direction. The first seat 340A is connected to the inner surface of the lower case 310 by welding or the like. The first seat 340A includes a first seat portion 341. The first seat portion 341 is formed substantially parallel to the bottom surface 312.

[0047] The second seat 340B is provided on the other side of the through hole h in the second direction. The second seat 340B is connected to the inner surface of the lower case 310 by welding or the like. The second seat 340B includes a second seat portion 342. The second seat portion 342 is formed substantially parallel to the bottom surface 312.

[0048] As shown in FIG. 4, the second base 340B includes a reinforcing portion 343. The reinforcing portion 343 reinforces the lower case 310. The reinforcing portion 343 is connected to the second seat portion 342. The reinforcing portion 343 is connected to a portion of the bottom surface 312 of the lower case 310, between a plurality of first energy storage cells 101 (see FIG. 4) included in the energy storage stack 11 arranged outermost in the second direction and a plurality of second energy storage cells 102 (see FIG. 4) included in the energy storage stack 12 adjacent to the energy storage stack 11. The reinforcing portion 343 extends along the first direction. The reinforcing portion 343 is connected to the peripheral wall 314. The reinforcing portion 343 may be connected to the pair of first frames 21 via brackets (not shown).

[0049] As shown in FIG. 4, the reinforcing portion 343 has a reinforcing portion main body 344 and a connecting bottom surface 345.

[0050] The reinforcing portion main body 344 has a shape that is convex in a direction away from the bottom surface 312 of the lower case 310. The reinforcing portion main body 344 is disposed below the external terminals 130 of the energy storage cell 100. The reinforcing portion main body 344 overlaps in the up-down direction with both of a pair of external terminals 130 that face each other in the second direction.

[0051] The connecting bottom surface 345 extends outward in the second direction from the lower end of the reinforcing portion main body 344. The connecting bottom surface 345 is connected to the bottom surface 312 of the lower case 310 by welding or the like. The connecting bottom surface 345 connects the reinforcing portion main body 344 and the second seat portion 342. The connecting bottom surface 345 is formed flat.

[0052] The space forming member 350 forms a space S (see FIGS. 3 and 4) together with the bottom surface 312 of the lower case 310. The space forming member 350 is fixed to the structural member 340. The space forming member 350 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 350 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.

[0053] 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.

[0054] The space forming member 350 has through holes 354h 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 354h. In this embodiment, the through holes 354h are provided in the space forming member 350 at positions facing the respective safety valves SV.

[0055] 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.

[0056] As shown in FIG. 4, the space forming member 350 has a first mounting portion 351, a second mounting portion 352, a support portion 353, and a connecting portion 354.

[0057] The first mounting portion 351 is placed on the first seat portion 341 of the first pedestal 340A. In other words, the first seat portion 341 supports the first mounting portion 351. The first mounting portion 351 is formed flat.

[0058] The second mounting portion 352 is placed on the second seat portion 342 of the second pedestal 340B. In other words, the second seat portion 342 supports the second mounting portion 352. The second mounting portion 352 is formed flat.

[0059] 4, in this embodiment, the second seat 340B further includes a first seat portion 341 that supports a first mounting portion 351 of the space forming member 350 that is disposed below the plurality of energy storage cells 102. The first seat portion 341 is connected to a reinforcing portion 343.

[0060] The support portion 353 protrudes from the first mounting portion 351 and the second mounting portion 352. The support portion 353 supports the cooler 200. That is, the cooler 200 is disposed between the lower surface of the cell casing 120 and the space forming member 350. The support portion 353 has a first support portion 353a and a second support portion 353b.

[0061] The first support portion 353a supports the upstream flow path 211. More specifically, the first support portion 353a supports the upstream flow path 211 via an adhesive member 920. The first support portion 353a is formed in a flat plate shape.

[0062] The second support portion 353b supports the downstream flow path 212. More specifically, the second support portion 353b supports the downstream flow path 212 via an adhesive member 920. The second support portion 353b is formed in a flat plate shape.

[0063] The connecting portion 354 connects the first support portion 353a and the second support portion 353b. In this embodiment, the connecting portion 354 protrudes from the first support portion 353a and the second support portion 353b. As shown in FIG. 4, the connecting portion 354 is located within a through-hole h of the cooler 200. In other words, the connecting portion 354 overlaps with the upstream flow path 211 and the downstream flow path 212 in the second direction. A through-hole 354h is provided in a portion of the connecting portion 354 facing the safety valve SV.

[0064] As shown in Fig. 4, a heat insulating plate 250 may be placed on the connecting portion 354. The heat insulating plate 250 is provided between each through hole 354h of the space forming member 350 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 354h. A notch may be formed in each heat insulating plate 250 at a portion that overlaps the edge of the through hole 354h.

[0065] 4, a protective plate 380 may be disposed on the bottom surface 312 of the lower case 310. The protective plate 380 receives the blast discharged from the safety valve SV. The protective plate 380 is disposed on a portion of the bottom surface 312 that is located below the through-hole 354h of the space forming member 350. The protective plate 380 is made of a heat insulating material (for example, mica, which is made by solidifying natural inorganic minerals by heat pressing).

[0066] The fastening members B1 and B2 fasten the space forming member 350 to the structural member 340. In this embodiment, the fastening members B1 and B2 include a first fastening portion B1 and a second fastening portion B2.

[0067] The first fastening portion B1 fastens the first mounting portion 351 to the first seat portion 341 of the first pedestal 340A. An example of the first fastening portion B1 is a bolt. The first fastening portion B1 may be connected to the first seat portion 341 by welding or the like. The first mounting portion 351 is fastened to the first seat portion 341 by the first fastening portion B1 and a nut N1.

[0068] The second fastening portion B2 fastens the second mounting portion 352 to the second seat portion 342 of the second pedestal 340B. An example of the second fastening portion B2 is a bolt. The second fastening portion B2 may be connected to the second seat portion 342 by welding or the like. The second mounting portion 352 is fastened to the second seat portion 342 by the second fastening portion B2 and a nut N2.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] The electronic control unit 816 is disposed above the junction box 812 .

[0074] The equipment cover 830 houses the junction box 812 , the power supply unit 814 , the electronic control unit 816 , and the second cooler 824 .

[0075] 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 354h. 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.

[0076] 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.

[0077] 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 354h 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.

[0078] Furthermore, since the heat insulating plate 250 is placed on the connecting portion 354 that protrudes from the first support portion 353a and the second support portion 353b, 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.

[0079] Furthermore, since the space forming member 350 is fastened to the structural member 340 by fastening members B1 and B2, if the panel member 330 is damaged due to the energy storage device 10 being subjected to an external force from below, for example, it is possible to replace the unit consisting of the lower case 310, the panel member 330 and the structural member 340 (the bottom part of the energy storage device 10) by breaking the sealing material between the lower case 310 and the upper cover 320 and removing the fastening parts B1 and B2.

[0080] Modifications of the above embodiment will now be described.

[0081] 7, a space S may be formed between the bottom surface 312 of the lower case 310 and the panel member 330, and the cooler 200 may be disposed in the space S. In this example, the panel member 330 forms the space S together with the bottom surface 312, and the space forming member 350 in the above embodiment is omitted.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] In this example, a cross member 360 is connected to the bottom surface 312 of the lower case 310. The cross member 360 is connected by welding or the like to a portion of the bottom surface 312 between a pair of adjacent power storage stacks. The cross member 360 has a structure similar to that of the reinforcing portion 343 in the above embodiment.

[0087] The panel member 330 is fastened to the bottom surface 312 of the lower case 310 by fastening members B1 and B2. Specifically, the panel member 330 has a first clamped portion 331 and a second clamped portion 332.

[0088] The first clamped portion 331 is clamped between a first fastening portion B1 and a nut N1. The first fastening portion B1 is fixed to a bracket 370 that is connected to the lower case 310 by welding or the like. The first fastening portion B1 may be welded to the bracket 370.

[0089] The second clamped portion 332 is clamped between a portion of the bottom surface 312 of the lower case 310 between the first energy storage cell 101 and the second energy storage cell 102 and the nut N2. The nut N2 is connected to the lower surface of the second clamped portion 332 by welding or the like. The second fastening portion B2 is screwed into the nut N2, thereby clamping the second clamped portion 332.

[0090] In this example of the energy storage device 10, the panel member 330 is fastened to the lower case 310 by fastening members B1 and B2, and therefore by removing the fastening members B1 and B2, the panel member 330 that forms the bottom part of the energy storage device 10 can be removed from the lower case 310.

[0091] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0092] [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 structural member fixed to the lower case; a space forming member fixed to the structural member and forming a space together with the bottom surface of the lower case; a fastening member that fastens the space forming member to the structural member, The space forming member has a through hole provided below the safety valve.

[0093] In this energy storage device, the space-forming member is fastened to the structural member by a fastening member, so that by removing the fastening member, the lower case that forms the bottom part of the energy storage device can be removed from the space-forming member together with the structural member.

[0094] [Aspect 2] the at least one storage cell includes a plurality of storage cells arranged in a line along a first direction; The structural member is a first seat provided on one side of the through hole in a second direction perpendicular to both the first direction and the vertical direction; a second seat provided on the other side of the through hole in the second direction, The space forming member is a first placement portion placed on the first base; a second mounting portion mounted on the second base, The fastening member is a first fastening portion that fastens the first mounting portion to the first base; a second fastening portion that fastens the second mounting portion to the second base.

[0095] [Aspect 3] The plurality of storage cells are a plurality of first storage cells arranged in the first direction; a plurality of second storage cells that face the plurality of first storage cells in the second direction and are arranged side by side along the first direction, the first base includes a first seat portion that supports the first mounting portion, The second base is a second seat portion supporting the second placement portion; a reinforcing portion connected to the second seat portion and reinforcing the lower case, 3. The energy storage device according to claim 2, wherein the reinforcing portion is connected to a portion of the bottom surface of the lower case between the plurality of first energy storage cells and the plurality of second energy storage cells and extends along the first direction.

[0096] In this aspect, since the second seat includes a reinforcing portion, the number of parts is reduced compared to when a dedicated reinforcing member for reinforcing the lower case is provided.

[0097] [Aspect 4] 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 panel member provided below the bottom surface of the lower case, the panel member forming a space between the panel member and the bottom surface of the lower case; a fastening member that fastens the panel member to the lower case, The bottom surface of the lower case has an opening provided below the safety valve.

[0098] In this energy storage device, the panel member is fastened to the lower case by fastening members, so that by removing the fastening members, the panel member that forms the bottom portion of the energy storage device can be removed from the lower case.

[0099] [Aspect 5] a cooler disposed in the space and configured to cool the at least one power storage cell; Aspect 5. The power storage device according to aspect 4, wherein the cooler is in thermal contact with the lower surface of the at least one power storage cell via at least the bottom surface of the lower case.

[0100] [Aspect 6] a protective plate disposed on a portion of the bottom surface of the lower case that is positioned below the through hole of the space forming member, 2. The power storage device according to claim 1, wherein the protective plate is made of a heat insulating material.

[0101] 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]

[0102] 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, 331 first clamped portion, 332 second clamped portion, 340 structural member, 340A first base, 340B second base, 341 first seat portion, 342 second seat portion, 343 reinforcing portion, 344 reinforcing portion main body, 345 connecting bottom surface, 350 space forming member, 351 first mounting portion, 352 second mounting portion, 353 support portion, 353a first support portion, 353b second support portion, 354 connecting portion, 354h through hole, 360 cross 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 material, B1 first fastening part (fastening member), B2 second fastening part (fastening 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 structural member fixed to the lower case; a space forming member fixed to the structural member and forming a space together with the bottom surface of the lower case; a fastening member that fastens the space forming member to the structural member, The space forming member has a through hole provided below the safety valve.

2. the at least one storage cell includes a plurality of storage cells arranged in a line along a first direction; The structural member is a first seat provided on one side of the through hole in a second direction perpendicular to both the first direction and the vertical direction; a second seat provided on the other side of the through hole in the second direction, The space forming member is a first mounting portion mounted on the first base; a second mounting portion mounted on the second base, The fastening member is a first fastening portion that fastens the first mounting portion to the first base; The power storage device according to claim 1 , further comprising: a second fastening portion that fastens the second mounting portion to the second base.

3. The plurality of storage cells are a plurality of first storage cells arranged to be aligned along the first direction; a plurality of second storage cells that are arranged to face the plurality of first storage cells in the second direction and to be aligned along the first direction, the first base includes a first seat portion that supports the first mounting portion, The second base is a second seat portion supporting the second placement portion; a reinforcing portion connected to the second seat portion and reinforcing the lower case, 3. The energy storage device according to claim 2, wherein the reinforcing portion is connected to a portion of the bottom surface of the lower case between the plurality of first energy storage cells and the plurality of second energy storage cells, and extends along the first direction.

4. 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 panel member provided below the bottom surface of the lower case, the panel member forming a space between the panel member and the bottom surface of the lower case; a fastening member that fastens the panel member to the lower case, The bottom surface of the lower case has an opening provided below the safety valve.

5. a cooler disposed in the space and configured to cool the at least one power storage cell; The power storage device according to claim 4 , wherein the cooler is in thermal contact with the lower surface of the at least one power storage cell via at least the bottom surface of the lower case.

6. a protective plate disposed on a portion of the bottom surface of the lower case that is positioned below the through hole of the space forming member, The power storage device according to claim 1 , wherein the protective plate is made of a heat insulating material.

Images