Power storage device

Abstract

To provide a power storage device that reduces the impact on a vehicle of exhaust gas discharged from a power storage cell, and that can suppress the impact on the outside even when the exhaust gas is discharged to the outside from the power storage device.SOLUTION: A power storage device includes a storage module including a plurality of storage cells, a storage case that houses the storage module, a panel member provided below a cooler, and a path defining member that is provided between the storage case and the panel member and defines a smoke exhaust passage 70, and each of the plurality of storage cells includes a cell case and a cell smoke exhaust valve that is provided at the bottom of the cell case and through which exhaust gas within the cell case is exhausted, and the bottom of the storage case is formed with a plurality of smoke exhaust holes formed in positions opposite the cell smoke exhaust valves.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present disclosure relates to an electricity storage device. [Background technology]

[0002] Various types of energy storage devices have been proposed. For example, the energy storage device described in JP-A-2022-525014 includes an energy storage module including a plurality of energy storage cells and a cooling device for cooling the energy storage cells. Each energy storage cell includes external terminals provided on each side and an explosion-proof valve provided on one side. The cooling device is provided on the upper surface of the energy storage module. [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 above-described electricity storage device, an explosion-proof valve is provided on the side of the electricity storage cell. When exhaust gas is discharged from the explosion-proof valve, it has a significant effect on the adjacent electricity storage cells.

[0005] In addition, it is possible to provide an explosion-proof valve on the top surface of the energy storage cell. However, since the energy storage device is often provided on the bottom of the vehicle, if exhaust gas is discharged from the top surface of the energy storage cell, the exhaust gas may affect the vehicle.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and its purpose is to provide a storage device that reduces the impact on a vehicle of exhaust gas discharged from a storage cell, and that can suppress the impact on the outside even when exhaust gas is discharged from the storage device to the outside. [Means for solving the problem]

[0007] The energy storage device according to the present disclosure comprises an energy storage module including a plurality of energy storage cells, a storage case that houses the energy storage module, a panel member provided below the storage case, and a path defining member that is provided between the storage case and the panel member and defines a smoke exhaust passage, and each of the plurality of energy storage cells includes a cell case and a cell smoke exhaust valve that is provided at the bottom of the cell case and that exhausts exhaust gas from within the cell case, and the bottom of the storage case is formed with a plurality of smoke exhaust holes that are positioned opposite the cell smoke exhaust valves.

[0008] In this energy storage device, when gas is discharged from the cell smoke exhaust valve of the energy storage cell, the gas passes through a smoke exhaust hole formed in the housing case and enters the space between the panel member and the housing case. The gas that has entered this space flows through the smoke exhaust path defined by the path defining member and is then exhausted to the outside. As the gas flows through the smoke exhaust circuit, heat from the gas is dissipated to the panel member. This reduces the impact on the vehicle and surrounding area even if the gas is exhausted to the outside.

[0009] In the above-mentioned energy storage device, when the path determining member and the bottom of the storage case are viewed in a plane, the path determining member includes a first defining portion formed to surround an area in which multiple smoke exhaust holes are formed, and a second defining portion arranged on the outer periphery of the first defining portion and formed to surround the first defining portion, a smoke exhaust passage is formed between the first defining portion and the second defining portion, the first defining portion is formed with at least one first opening portion through which exhaust gas can flow into the smoke exhaust passage, and the second defining portion is formed with a second opening portion that is formed at a position offset from the first opening portion in the direction in which the second defining portion extends and that is connected to the outside.

[0010] According to the electricity storage device, when gas is discharged from the cell smoke exhaust valve of the electricity storage cell, the gas passes through the smoke exhaust hole formed in the storage case and enters the space between the panel member and the storage case.

[0011] Gas that has entered the space between the panel member and the housing case passes through the first opening and enters the exhaust passage. The second opening is positioned offset from the first opening, allowing the gas to flow through the exhaust passage. As the gas passes through the exhaust passage, its heat is dissipated to the panel member and other components, lowering its temperature. The cooled gas is then exhausted to the outside through the second opening.

[0012] The above-mentioned power storage device further includes a cooler provided on the bottom surface of the casing, and the first defining portion is provided between the cooler and the panel member.

[0013] According to the electricity storage device, the gas dissipates heat to the cooler while flowing through the exhaust passage, thereby allowing the gas to be cooled effectively.

[0014] The above-mentioned electricity storage device further includes a blast collecting portion provided in the exhaust gas passage, and the blast collecting portion is formed so as to extend from the second defining portion toward the first defining portion.

[0015] According to this energy storage device, even if the gas discharged from the energy storage cell contains blast such as metal fragments, the blast can be collected in at least one of the spaces between the blast collection section and the storage case and between the blast collection section and the panel member while the gas flows through the exhaust passage.

[0016] In the above-described electricity storage device, the second defining portion is formed by fixing a portion of the panel member located outside the first defining portion to the fixing target member and being in close contact with the first defining portion.

[0017] According to the electricity storage device, the panel member is in close contact with the fixing target portion, so that gas flowing through the exhaust passage can be prevented from leaking to the outside of the electricity storage device.

[0018] In the above-mentioned energy storage device, the storage case includes a lower case located on the underside of the storage case and an upper case located above the lower case, the lower case includes a storage section inside which the energy storage module is located and an annular bracket unit provided on the outer peripheral surface of the storage section, the fixing target member is fixed to the bracket unit, and the second defining portion is formed by fixing the panel member to the bracket unit.

[0019] According to the electricity storage device, the panel member is fixed to the bracket unit, so that gas can be prevented from leaking to the outside from the contact surface of the panel member.

[0020] The electric storage device is disposed at the bottom of the vehicle, and a plurality of first openings are formed at intervals in the direction in which the first defining portion extends, and the second opening is formed to open toward the rear of the vehicle. According to the electric storage device, gas is exhausted to the outside from the rear of the vehicle.

[0021] The above-mentioned storage device further includes a cooler provided on the underside of the storage case below the plurality of storage cells, the plurality of storage cells being arranged in an array direction, the cooler being formed to extend in the array direction and including a first circulating section and a second circulating section through which a refrigerant flows, the first circulating section and the second circulating section being arranged at a distance from each other, and the cooler having an opening formed in a position opposite the cell smoke exhaust valve.

[0022] According to the electricity storage device, gas discharged from the electricity storage cells can pass through the openings in the cooler and enter the space between the panel member and the casing. [Effects of the Invention]

[0023] The energy storage device according to the present disclosure reduces the impact on a vehicle of exhaust gas discharged from the energy storage cells, and even when the exhaust gas is discharged to the outside from the energy storage device, the impact on the outside can be suppressed. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a schematic diagram showing a vehicle 2 on which an electricity storage device 1 is mounted. [Figure 2] FIG. 2 is an exploded perspective view showing the electricity storage device 1. [Figure 3] FIG. 2 is a perspective view showing a storage cell 29. [Figure 4] 2 is an exploded perspective view of the lower case 26 and the panel member 23 as viewed from below. FIG. [Figure 5] FIG. 2 is an exploded perspective view showing the lower case 26. [Figure 6] 2 is a perspective view showing the accommodation portion 50 and the plate portion 51 of the lower case 26. FIG. [Figure 7] 2 is a perspective view showing the housing portion 50, the plate portion 51, and the bracket unit 40. FIG. [Figure 8] 2 is a perspective view showing the accommodation section 50, the plate section 51, the bracket unit 40, and the cooling device 22 of the lower case 26. FIG. [Figure 9] 2 is an exploded perspective view showing a cooling device 22, a bracket unit 40, a path regulating portion 41, and the like. FIG. [Figure 10] 10 is a bottom view showing the cooling device 22, the lower case 26, the bracket unit 40, the path regulating portion 41, and the like. [Figure 11] 2 is an exploded perspective view showing the cooling device 22, the bracket unit 40, the path defining portion 41, the collection unit 42, the panel member 23, and the like. FIG. [Figure 12] 10 is a bottom view showing the cooling device 22, the bracket unit 40, the path defining portion 41, the collection unit 42, the panel member 23, and the like. [Figure 13] 1 is a cross-sectional view in the front-rear direction D1. [Figure 14] 2 is a cross-sectional view showing the right side portion of the electricity storage device 1. FIG. [Figure 15] FIG. 10 is a cross-sectional view showing the configuration of a protruding portion 52B and its surroundings. [Figure 16]10 is a cross-sectional view showing a side collecting portion 42C, a left side portion 41C, a side bracket 40C, a side portion 44C, and the surrounding configuration. [Figure 17] FIG. 1 is a cross-sectional view showing a power storage device 1A according to a first modification. [Figure 18] FIG. 10 is a cross-sectional view showing a power storage device 1B according to a second modification. DETAILED DESCRIPTION OF THE INVENTION

[0025] The power storage device according to the present disclosure will be described with reference to Figures 1 to 16. In the drawings referred to below, the same or equivalent components are denoted by the same numbers.

[0026] 1 is a schematic diagram showing a vehicle 2 equipped with a power storage device 1. The vehicle 2 includes a vehicle frame 3.

[0027] The vehicle skeleton 3 includes a front die-casting 4, a rear die-casting 5, and a center skeleton 6. The front die-casting 4 is disposed on the front side of the vehicle 2, and the rear die-casting 5 is disposed on the rear side of the vehicle 2. The center skeleton 6 is disposed between the front die-casting 4 and the rear die-casting 5.

[0028] The center frame 6 includes rockers 10 and 11 and cross members 12 and 13. The rockers 10 and 11 are formed to extend in the front-to-rear direction D1. The rocker 11 and the cross member 12 are arranged with a gap in the width direction D2. The rocker 10 and the rocker 11 connect the front die-cast 4 and the rear die-cast 5.

[0029] The cross members 12 and 13 are formed to extend in the width direction D2. The cross members 12 and 13 are arranged at an interval in the front-rear direction D1.

[0030] The power storage device 1 is fixed to the center frame 6. For example, the power storage device 1 is fixed to the locker 10 and the locker 11.

[0031] 2 is an exploded perspective view showing the electricity storage device 1. The electricity storage device 1 includes a housing case 20, an electricity storage module 21, a cooling device 22, and a panel member 23.

[0032] The storage case 20 includes a lower case 26 and an upper case 27. The lower case 26 is disposed on the underside of the storage case 20. The upper case 27 is fixed to the lower case 26 from above.

[0033] The power storage module 21 is housed in the housing case 20. The power storage module 21 includes a plurality of power storage units 28 arranged in the width direction D2.

[0034] Each power storage unit 28 is formed to extend in the front-rear direction D1. Each power storage unit 28 includes a plurality of power storage cells 29 arranged in the front-rear direction D1. In this specification, the front-rear direction D1 corresponds to the "direction in which the power storage cells are arranged."

[0035] The cooling device 22 is provided on the lower surface of the lower case 26. A coolant C is supplied to the cooling device 22, and the cooling device 22 is arranged below the electricity storage module 21 arranged on the upper surface of the lower case 26. The cooling device 22 cools the electricity storage module 21 through the lower case 26. The panel member 23 is arranged below the lower case 26, and the panel member 23 is arranged to cover the cooling device 22 from below.

[0036] 3 is a perspective view showing a storage cell 29. The storage cell 29 includes a cell case 14 and terminals 15 and 16. An electrode assembly and an electrolyte (not shown) are housed inside the cell case 14. The cell case 14 includes a top plate 17A, a bottom plate 17B, a main wall 17C, a main wall 17D, and end plates 17E and 17F.

[0037] The top plate 17A is provided on the top surface of the cell case 14, and the bottom plate 17B is provided on the bottom surface.

[0038] End plates 17E and 17F are arranged in width direction D2, and main walls 17C and 17D are arranged in front-rear direction D1. Terminal 15 is provided on end plate 17E, and terminal 16 is provided on end plate 17F.

[0039] A cell smoke vent valve 18 is formed on the bottom plate 17B. The cell smoke vent valve 18 opens when the internal pressure in the cell case 14 reaches or exceeds a predetermined value. The cell smoke vent valve 18 includes, for example, a thin-walled portion that is thinner than the portion of the bottom plate 17B located around the cell smoke vent valve 18. When the internal pressure in the cell case 14 reaches or exceeds a predetermined value, the thin-walled portion ruptures. Then, the gas in the cell case 14 is discharged to the outside of the cell case 14.

[0040] 4 is an exploded perspective view of the lower case 26 and the panel member 23 as viewed from below. The panel member 23 is fixed to the lower case 26 by a plurality of bolts 24.

[0041] The panel member 23 includes a main body 30 and a flange 31 formed on the outer periphery of the main body 30. The main body 30 is recessed downward relative to the flange 31. The flange 31 is formed to extend horizontally from the edge of the main body 30. In the example shown in this figure, an opening 32 is formed in the main body 30. The opening 32 is formed in a rear portion of the main body 30. The main body 30 includes a bottom plate 33 and a peripheral wall 34. The bottom plate 33 is located on the underside of the panel member 23. The peripheral wall 34 is formed to rise from the outer periphery of the panel member 23 and connects the peripheral wall 34 and the flange 31. The peripheral wall 34 includes a front wall 35 located in the front, a rear wall 36 located in the rear, a left side wall 37, and a right side wall 38, and the opening 32 is formed in the rear wall 36.

[0042] 5 is an exploded perspective view showing lower case 26. Lower case 26 includes a storage section 50, a plate section 51, a bracket unit 40, a path defining section 41, and a collection unit 42, and lower case 26 has cooling device 22 attached thereto.

[0043] FIG. 6 is a perspective view showing the accommodation portion 50 and the plate portion 51 of the lower case 26, and FIG. 7 is a perspective view showing the accommodation portion 50, the plate portion 51, and the bracket unit 40. As shown in FIG.

[0044] The storage section 50 includes a bottom plate 52 and a peripheral wall 53. The bottom plate 52 is formed in a plate shape, and a plurality of smoke exhaust holes 54 are formed in the bottom plate 52. The plurality of smoke exhaust holes 54 are arranged in the front-to-rear direction D1 of the vehicle 2 and also in the width direction D2.

[0045] The peripheral wall 53 is formed to extend upward from the outer peripheral edge of the bottom plate 52, and is formed in an annular shape. The peripheral wall 53 includes a front wall 55 disposed at the front, a rear wall 56 disposed at the rear, a left side wall 57, and a right side wall 58. The storage section 50 has an opening that opens upward, and the plate section 51 is formed to protrude horizontally from the edge of the opening of the storage section 50.

[0046] The lower case 26 includes a bracket unit 40 provided on the outer peripheral surface of the housing portion 50. The housing portion 50 has the power storage module 21 disposed therein.

[0047] 3 is disposed on the upper surface of the bottom plate 52. The cell smoke exhaust valve 18 of the power storage cell 29 and the smoke exhaust hole 54 are arranged in the vertical direction D3, and the cell smoke exhaust valve 18 and the smoke exhaust hole 54 are in communication with each other.

[0048] The bracket unit 40 is provided on the outer surface of the peripheral wall 53 of the lower case 26. The bracket unit 40 includes a front bracket 40A, a rear bracket 40B1, a rear bracket 40B2, and side brackets 40C and 40D.

[0049] The front bracket 40A is fixed to the outer surface of the front wall 55 of the lower case 26. The rear brackets 40B1 and 40B2 are provided on the outer surface of the rear wall 56. The rear brackets 40B1 and 40B2 are spaced apart in the width direction D2, and a gap 40F is formed between the rear brackets 40B1 and 40B2. The gap 40F is located in the center of the rear wall 56 in the width direction D2.

[0050] The side bracket 40C is provided on the outer surface of the left side wall 57, and the side bracket 40D is provided on the outer surface of the right side wall 58.

[0051] The bracket unit 40 is formed in a substantially annular shape, and a gap 40F is formed on the rear side in the front-rear direction D1.

[0052] 8 is a perspective view showing the accommodation portion 50, the plate portion 51, and the bracket unit 40 of the lower case 26, and the cooling device 22. The cooling device 22 includes a cooling portion 60, a connecting portion 61, and a connecting portion 62.

[0053] The cooling section 60 is formed to extend in the front-rear direction D1. The connecting section 61 is provided at the front end of the cooling section 60, and the connecting section 62 is provided at the rear end of the cooling section 60.

[0054] A supply pipe and a discharge pipe (not shown) are connected to the connection part 61. The coolant C is supplied from the supply pipe. The coolant C passes through the inside of the cooling part 60 and the connection part 61 and returns to the connection part 61. The coolant C that has returned to the connection part 61 is discharged from the discharge pipe.

[0055] Power storage unit 28 (not shown) is disposed above cooling section 60, with bottom plate 52 of lower case 26 sandwiched therebetween. Cooling section 60 includes circulating sections 63A, 64A and a connecting plate 65A, circulating sections 63B, 64B and a connecting plate 65B, circulating sections 63C, 64C and a connecting plate 65C, and circulating sections 63D, 64D and a connecting plate 65D.

[0056] Note that circulating portions 63B, 64B and connecting plate 65B, circulating portions 63C, 64C and connecting plate 65C, and circulating portions 63D, 64D and connecting plate 65D are configured similarly to circulating portions 63A, 64A and connecting plate 65A. Therefore, circulating portions 63A, 64A and connecting plate 65A will be described.

[0057] The flowing portions 63A and 64A are arranged at an interval in the width direction D2, and the flowing portions 63A and 64A are formed to extend in the front-rear direction D1.

[0058] The connecting plate 65A is disposed between the circulating portion 63A and the circulating portion 64A, and is provided so as to connect the circulating portion 63A and the circulating portion 64A.

[0059] The connecting plate 65A is formed with a plurality of openings 66. The plurality of openings 66 are formed at intervals in the front-rear direction D1.

[0060] Each opening 66 corresponds to each smoke exhaust hole 54 formed in the bottom plate 52, and when the cooling device 22 is fixed to the lower case 26, the openings 66 and the smoke exhaust holes 54 are arranged in the vertical direction relative to each other.

[0061] Note that instead of the multiple openings 66 arranged in the front-rear direction D1, an opening formed long in the front-rear direction D1 may be formed. Note that in the above-described opening, the smoke exhaust hole 54 formed in the lower case 26 communicates with the above-described opening when the cooling device 22 is fixed to the lower case 26. By using such an opening, it is possible to easily align the opening and the smoke exhaust hole 54.

[0062] The cooling device 22 is fixed to the bottom plate 52 of the lower case 26. Specifically, it is fixed to the bottom plate 52 by a heat conductive adhesive (not shown).

[0063] Fig. 9 is an exploded perspective view showing cooling device 22, bracket unit 40, path defining portion 41, etc. Fig. 10 is a bottom view showing cooling device 22, lower case 26, bracket unit 40, path defining portion 41, etc.

[0064] The path defining portion 41 is disposed on the lower surface of the cooling device 22. The path defining portion 41 includes an adhesive provided on the lower surface of the path defining portion 41, and is adhered to the panel member 23 disposed below the path defining portion 41.

[0065] The path defining portion 41 is formed in a substantially annular shape. The path defining portion 41 is formed with open portions 43A, 43B, 43C, and 43D spaced apart in the direction in which the path defining portion 41 extends.

[0066] 10, an area R1 surrounded by a two-dot chain line indicates an area where the smoke exhaust hole 54 is formed. The path defining portion 41 is disposed so as to surround the periphery of the area R1.

[0067] 9 and 10, the path defining portion 41 includes a front side portion 41A, a rear side portion v, a left side portion 41C, and a right side portion 41D.

[0068] The front side portion 41A is located on the front side of the path defining portion 41 and is formed to extend in the width direction D2. The front side portion 41A is disposed on the lower surface of the connection portion 61 of the cooling device 22.

[0069] The rear side portion 41B is located on the rear side of the path defining portion 41 and is formed to extend in the width direction D2. The rear side portion 41B is disposed on the lower surface of the connection portion 62 of the cooling device 22.

[0070] The left side portion 41C is disposed between the left end portion (one end portion in the width direction D2) of the front side portion 41A and the left end portion (one end portion in the width direction D2) of the rear side portion 41B. The left side portion 41C is disposed in the flow portion 64D. The left side portion 41C is formed to extend in the front-rear direction D1. In the front-rear direction D1, an open portion 43A is formed between the front end portion of the left side portion 41C and the front side portion 41A, and an open portion 43C is formed between the rear end portion of the left side portion 41C and the rear side portion 41B.

[0071] The right side portion 41D is disposed between the right end portion (the other end portion in the width direction D2) of the front side portion 41A and the right end portion (the other end portion in the width direction D2) of the rear side portion 41B. The right side portion 41D is disposed in the flow portion 63A. The right side portion 41D is formed to extend in the front-rear direction D1. In the front-rear direction D1, an open portion 43B is formed between the front end portion of the right side portion 41D and the front side portion 41A, and an open portion 43D is formed between the rear end portion of the right side portion 41D and the rear side portion 41B.

[0072] 11 is an exploded perspective view showing cooling device 22, bracket unit 40, path defining portion 41, collection unit 42, panel member 23, etc. Collection unit 42 is disposed outside path defining portion 41, and collection unit 42 is fixed to bracket unit 40.

[0073] The collection unit 42 includes a plurality of blast collection portions 42A, 42B, 42C, and 42D. The front collection portion 42A is fixed to the front bracket 40A, and is disposed adjacent to the front side portion 41A.

[0074] The rear collecting portion 42B is fixed to the rear bracket 40B1 and the rear bracket 40B2, and is disposed at a position adjacent to the rear side portion 41B.

[0075] Side collection portion 42C is fixed to side bracket 40C and is located adjacent to left side portion 41C. Side collection portion 42D is fixed to side bracket 40D and is located adjacent to right side portion 41D.

[0076] The collection unit 42 is fixed in an annular shape by a plurality of bolts 24 to a bracket unit 40 which is formed in an annular shape together with the panel member 23 .

[0077] In this way, the panel member 23 is fixed in an annular shape to the bracket unit 40. As a result, the panel member 23 comes into contact with the bracket unit 40 or the collection unit 42 in an annular shape.

[0078] 12 is a bottom view showing the cooling device 22, the bracket unit 40, the path defining portion 41, the collection unit 42, the panel member 23, etc. Contact area R2 indicates the area with which the panel member 23 comes into contact. Note that in FIG. 12, hatching is used to clarify the contact area R2. The contact area R2 is located outside the path defining portion 41, and the contact area R2 is formed to surround the path defining portion 41.

[0079] In the contact region R2, the panel member 23 comes into contact with the bracket unit 40 or the collection unit 42, thereby forming a path defining portion 44.

[0080] That is, the path defining portion 44 is located outside the path defining portion 41 and is formed so as to surround the path defining portion 41.

[0081] The path defining portion 44 includes a front side portion 44A, a rear side portion 44B1, a rear side portion 44B2, a side portion 44C, and a side portion 44D.

[0082] The front side portion 44A is located on the front bracket 40A, and the rear side portions 44B1 and 44B2 are located on the rear bracket 40B. Similarly, the side portions 44C and 44D are located on the side brackets 40C and 40D.

[0083] An opening 45 is also formed in the path defining portion 44. The opening 45 is formed between the rear side portion 44B1 and the rear side portion 44B2.

[0084] The path defining portions 41 and 44 configured as described above form an exhaust passage 70 between the panel member 23 and the lower case 26.

[0085] The exhaust passage 70 includes a front passage 70A, rear passages 70B1 and 70B2, a side passage 70C, and a side passage 70D.

[0086] The front passage 70A is located between the front edge 41A and the front edge 44A. The rear passage 70B1 is located between the rear edge 41B1 and the rear edge 44B1. The rear passage 70B2 is located between the rear edge 41B2 and the rear edge 44B2. The side passage 70C is located between the left edge 41C and the side edge 44C. The side passage 70D is located between the right edge 41D and the side edge 44D.

[0087] When the panel member 23 is attached to the lower case 26, a smoke exhaust space R3 surrounded by the path regulating portion 41 is formed in the space between the panel member 23 and the lower case 26. As shown in Figure 9, when the lower case 26 and the like are viewed in plan from below, the region R1 in which the smoke exhaust holes 54 are formed and the smoke exhaust space R3 overlap.

[0088] The exhaust passage 70 communicates with the smoke exhaust space R3 through the openings 43A, 43B, 43C, and 43D. The exhaust passage 70 communicates with the outside through the opening 45.

[0089] Fig. 13 is a cross-sectional view in the front-rear direction D1. The cross-section in Fig. 13 passes through the center in the width direction D2 and extends in the front-rear direction D1.

[0090] 13, a smoke exhaust space R3 is formed between the lower case 26 and the panel member 23. Here, the smoke exhaust space R3 is located below the lower case 26. The electricity storage device 1 is disposed on the underside of the vehicle frame 3. The smoke exhaust space R3 is located below the electricity storage module 21, and the vehicle frame 3, including the cross members 12 and 13, is located above the electricity storage module 21.

[0091] 14 is a cross-sectional view showing the right side portion of the energy storage device 1. The bottom plate 52 of the lower case 26 includes a bottom main body 52A in which the energy storage cells 29 are arranged, and an overhanging portion 52B.

[0092] A thermally conductive adhesive 77 is provided on the upper surface of the bottom body 52A, and the thermally conductive adhesive 77 bonds the bottom body 52A and the energy storage cells 29 together. A thermally conductive adhesive 78 is provided on the lower surface of the bottom body 52A, and the thermally conductive adhesive 78 bonds the cooling device 22 and the bottom body 52A together. A plurality of overhanging portions 52B are formed at intervals in the width direction D2, and each overhanging portion 52B is formed to extend in the front-to-rear direction D1. The overhanging portions 52B are formed to overhang downward from the bottom body 52A. The lower ends of the overhanging portions 52B are located in openings 66 formed in the cooling device 22.

[0093] 15 is a cross-sectional view showing the configuration of the protruding portion 52B and its surroundings. The protruding portion 52B includes a bottom plate 71 and side walls 72A and 72B. The side walls 72A and 72B are formed to connect the bottom plate 71 and the bottom body 52A. The bottom plate 71 is formed with a smoke exhaust hole 54. A cell smoke exhaust valve 18 is disposed above the smoke exhaust hole 54.

[0094] The electricity storage device 1 includes waterproof adhesives 73A and 73B, a waterproof plate 74, a waterproof sheet 75, and a heat-resistant plate .

[0095] The waterproof adhesives 73A and 73B are disposed on the upper surface of the bottom plate 71, and are formed to extend in the front-to-rear direction D1. The waterproof adhesives 73A and 73B are disposed at intervals in the width direction D2, and a smoke exhaust hole 54 is disposed between the waterproof adhesives 73A and 73B.

[0096] The waterproof plate 74 includes support portions 74A and 74B and a closure plate 74C. The waterproof plate 74 is formed to extend in the front-to-rear direction D1. The support portion 74A is disposed on the upper surface of the waterproof adhesive 73A, and the support portion 74B is disposed on the upper surface of the waterproof adhesive 73B. The closure plate 74C is disposed across the support portions 74A and 74B. The waterproof plate 74 is formed from resin or the like.

[0097] The waterproof adhesives 73A, 73B and the waterproof plate 74 close the smoke exhaust holes 54 on the upper surface side of the protruding portion 52B. The waterproof adhesives 73A, 73B and the waterproof plate 74 are formed to extend in the front-to-rear direction D1, and close the plurality of smoke exhaust holes 54 arranged in the front-to-rear direction D1.

[0098] Waterproof sheet 75 is placed on the underside of protruding portion 52B and blocks smoke exhaust holes 54. Waterproof sheet 75 is formed to extend in front-to-rear direction D1 and blocks multiple smoke exhaust holes 54 arranged in front-to-rear direction D1.

[0099] The heat-resistant plate 76 is disposed on the upper surface of the panel member 23, and is disposed below the smoke exhaust holes 54. The heat-resistant plate 76 is formed from mica or the like. The heat-resistant plate 76 is formed to extend in the front-rear direction D1, and is located below the plurality of smoke exhaust holes 54 arranged in the front-rear direction D1.

[0100] FIG. 16 is a cross-sectional view showing the configuration of the side collecting portion 42C, the left side portion 41C, the side bracket 40C, the side portion 44C, and the surrounding areas.

[0101] The left side portion 41C of the path defining portion 41 includes an elastic portion 80 and an adhesive layer 81. The elastic portion 80 is made of an elastically deformable material such as silicon. The elastic portion 80 is in contact with the lower surface of the cooling device 22. The adhesive layer 81 bonds the elastic portion 80 and the upper surface of the panel member 23 together.

[0102] The contact position of left side portion 41C is not limited to the lower surface of cooling device 22. For example, if cooling device 22 is not provided, path defining portion 41 may be configured to contact the lower surface of bottom plate 52 of lower case 26.

[0103] The side bracket 40C is disposed across the bottom plate 52 and the peripheral wall 53. The side bracket 40C is fixed to the bottom plate 52 and the peripheral wall 53 by bolts, welding, or the like (not shown).

[0104] The panel member 23 is fixed to the side bracket 40C by the bolts 24. A side collecting portion 42C is disposed between the panel member 23 and the side bracket 40C. The panel member 23 comes into contact with the side bracket 40C or the side collecting portion 42C of the lower case 26, thereby forming a side portion 44C of the path defining portion 44.

[0105] The side collection portion 42C is disposed within a side passage 70C of the exhaust passage 70. The side collection portion 42C includes a fixing portion 46, an inclined portion 47, and an overhanging portion 48. The fixing portion 46 is disposed between the panel member 23 and the side bracket 40C, and is fixed by a bolt 24.

[0106] The fixing portion 46 is disposed between the panel member 23 and the side bracket 40C, and the fixing portion 46 and the side bracket 40C are bonded together with an adhesive 49. The fixing portion 46 is formed to extend from between the panel member 23 and the side bracket 40C toward the path defining portion 41.

[0107] The inclined portion 47 is provided at the tip of the fixed portion 46, and the protruding portion 48 is formed so as to extend toward the center of the left side portion 41C in the up-down direction D3.

[0108] As a result, a collection space 82 is formed between the side collection portion 42C and the lower case 26. Meanwhile, a filler 84 is filled between the side collection piece 42C and the panel member 23. The filler 84 is made of, for example, resin.

[0109] Although the side bracket 40C and the side collecting portion 42C have been described above, the front bracket 40A, the rear brackets 40B1 and 40B2, and the side collecting portion 42D are also formed in the same manner.

[0110] In Figure 14, a short circuit or the like may occur in the energy storage cell 29. When this occurs, gas is generated in the energy storage cell 29, causing the internal pressure in the cell case 14 to rise. When the internal pressure in the cell case 14 reaches or exceeds a predetermined value, the cell smoke vent valve 18 opens, and exhaust gas is emitted from the cell smoke vent valve 18. Here, the vehicle frame 3 is located above the energy storage device 1, while the cell smoke vent valve 18 is arranged facing downward. This prevents the exhaust gas emitted from the cell smoke vent valve 18 from affecting the vehicle frame 3, etc.

[0111] In Figure 15, when exhaust gas is ejected from the cell smoke exhaust valve 18, the exhaust gas is blown onto the closure plate 74C of the waterproof plate 74. The closure plate 74C then melts, forming a hole, and the exhaust gas is then blown onto the waterproof sheet 75, which also melts and forms a hole.

[0112] As a result, exhaust gas passes through the holes formed in the blocking plate 74C, the smoke exhaust holes 54, the holes formed in the waterproof sheet 75, and the opening 66 of the cooling device 22 and enters the smoke exhaust space R3. The smoke exhaust space R3 is located below the electricity storage module 21, and the vehicle frame 3, including the cross members 12 and 13, is located above the electricity storage device 1. Therefore, even if exhaust gas is ejected into the smoke exhaust space R3, the exhaust gas is prevented from affecting the vehicle frame 3.

[0113] The heat-resistant plate 76 is disposed on the upper surface of the panel member 23, and is located below the smoke exhaust hole 54. Therefore, when exhaust gas is ejected downward from the smoke exhaust hole 54, the exhaust gas is blown onto the heat-resistant plate 76, and the exhaust gas is prevented from being blown directly onto the panel member 23. This prevents damage to the panel member 23.

[0114] In FIG. 12, the exhaust gas that has entered the smoke exhaust space R3 flows into the exhaust passage 70 through the openings 43A, 43B, 43C, and 43D.

[0115] In this way, exhaust gas flows from the smoke exhaust space R3 into the exhaust passage 70 through the multiple openings 43A, 43B, 43C, and 43D, which makes it possible to prevent the internal pressure in the smoke exhaust space R3 from increasing, thereby making it possible to prevent damage to the path defining portion 41 and the like.

[0116] The exhaust gas that has entered the exhaust passage 70 flows through the exhaust passage 70. Here, the open portions 43A, 43B, 43C, 43D and the open portion 45 are provided at positions shifted from each other in the direction in which the exhaust passage 70 extends.

[0117] Therefore, the exhaust gas that has entered the exhaust passage 70 is unlikely to be immediately discharged from the open portion 45 and ends up flowing through the exhaust passage 70 .

[0118] As the exhaust gas flows through the exhaust passage 70, the exhaust gas radiates heat to the panel member 23 and the like. In particular, in this embodiment, the cooling device 22 is provided on the underside of the lower case 26, so the exhaust gas flowing through the exhaust passage 70 comes into contact with the cooling device 22. As a result, the exhaust gas is cooled effectively by the cooling device 22.

[0119] The exhaust gas flows through the exhaust passage 70 and is then discharged from the open portion 45 to the outside of the energy storage device 1. When the exhaust gas is discharged from the open portion 45, the temperature of the exhaust gas is low, and it is possible to prevent high-temperature exhaust gas from being discharged to the outside of the energy storage device 1.

[0120] In FIG. 16, the exhaust gas flowing through the exhaust passage 70 may contain blast of metal fragments or the like.

[0121] As the exhaust gas flows through the exhaust passage 70 , the blast enters the collection space 82 .

[0122] In this way, by capturing the blast as the exhaust gas flows through the exhaust passage 70, the blast can be prevented from being discharged outside the energy storage device 1 when the exhaust gas is discharged from the open portion 45.

[0123] When exhaust gas from the energy storage cells 29 is ejected into the smoke exhaust space R3, it is conceivable that the exhaust gas will leak into the exhaust passage 70 from between the elastic portion 80 and the cooling device 22. Even in such a case, the side collection portion 42C is disposed on the outer side of the left side portion 41C and can collect blast that has entered the exhaust passage 70. The side collection portion 42C is formed to extend toward the center of the left side portion 41C in the up-down direction D3. Therefore, the side collection piece 42C can effectively collect blast that has leaked from between the elastic portion 80 and the cooling device 22. An adhesive 49 is provided between the fixing portion 46 and the side bracket 40C, which prevents blast that has entered the collection space 82 from leaking out from between the fixing portion 46 and the side bracket 40C.

[0124] Furthermore, since the left side portion 41C of the path determining portion 41 is adhered to the upper surface of the panel member 23 by an adhesive layer 81, the exhaust gas ejected into the smoke exhaust space R3 is prevented from entering the side passage 70C through the gap between the adhesive layer 81 and the panel member 23.

[0125] The path regulating portion 44 is formed by the panel member 23 being in annular contact with the bracket unit 40 or the collection unit 42. The panel member 23, the bracket unit 40, and the collection unit 42 are all metal members.

[0126] Therefore, even if high-temperature exhaust gas flows through the exhaust passage 70, the exhaust gas is prevented from leaking out of the power storage device 1 from the path defining portion 44 through the exhaust passage 70. (Variation 1) In the above-described embodiment, a metal blast collector is provided to collect blast contained in exhaust gas. Fig. 17 is a cross-sectional view showing a power storage device 1A according to Modification 1. Power storage device 1A includes a side collector 90 formed in cooling device 22. Cooling device 22 includes an upper plate 91 and a lower plate 92 fixed to the lower surface of upper plate 91. A refrigerant passage through which a refrigerant flows is formed between upper plate 91 and lower plate 92. Side collector 90 is formed on the outer periphery of cooling device 22 and is formed by upper plate 91 and lower plate 92.

[0127] The side collection portion 90 includes a side wall 93 and a protruding portion 94. The side wall 93 is formed so as to extend downward from the outer peripheral edge of the cooling device 22. The protruding portion 94 is formed so as to extend from the lower end of the side wall 93 toward the left side portion 41C.

[0128] Even in such a side collection portion 90, for example, even if exhaust gas is ejected from between the elastic portion 80 and the cooling device 22, the blast in the exhaust gas can be effectively collected.

[0129] (Variation 2) 18 is a cross-sectional view showing a power storage device 1B according to Modification 2. The power storage device 1B includes a blast collector 95 arranged on the outer periphery of the path defining portion 41. The blast collector 95 includes an elastic portion 96 and an adhesive layer 97. Note that the adhesive layer 81 on the left side portion 41C is bonded to the panel member 23, while the adhesive layer 97 on the blast collector 95 is bonded to the cooling device 22. In this way, the adhesive layer 97 on the blast collector 95 is arranged on the opposite side in the up-down direction D3 to the adhesive layer 81 on the left side portion 41C.

[0130] As a result, when exhaust gas is ejected from between the elastic part 80 and the cooling device 22, the adhesive layer 97 is adhered to the cooling device 22, so that the ejected exhaust gas can be prevented from blowing out further outward than the blast collection section 95.

[0131] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0132] 1, 1A, 1B Energy storage device, 2 Vehicle, 3 Vehicle frame, 4 Front die-cast, 5 Rear die-cast, 6 Center frame, 10, 11 Rocker, 12, 13 Cross member, 14 Cell case, 15, 16 Terminal, 17A Upper plate, 17B, 33, 52, 71 Bottom plate, 17C, 17D Main wall, 17E, 17F End plate, 18 Cell smoke exhaust valve, 20 Housing case, 21 Energy storage module, 22 Cooling device, 23 Panel member, 24 Bolt, 26 Lower case, 27 Upper case, 28 Energy storage unit, 29 Energy storage cell, 30 Main body, 31 Flange, 32, 66 Opening, 34, 53 Peripheral wall, 35, 55 Front wall, 36, 56 Rear wall, 37, 57 Left side wall, 38, 58 Right side wall, 40 Bracket unit, 40A front bracket, 40B1, 40B2 rear bracket, 40C, 40D side bracket, 40F, 42F gap, 41, 44 path determining portion, 41A, 44A front edge portion, 41B1, 41B2, 41B, 44B1, 44B2 rear edge portion, 41C left edge portion, 41D right edge portion, 42 collection unit, 42A, 42B, 42C, 42D, 90, 95 collection piece, 43A, 43B, 43C, 43D, 45 open portion, 44C, 44D side edge portion, 46 fixing portion, 47 inclined portion, 48, 52B, 94 extension portion, 50 storage portion, 51 plate portion, 52A bottom body, 54 smoke exhaust hole, 60 cooling portion, 61, 62 Connection part, 63A, 63B, 63C, 63D, 64A, 64B, 64C, 64D Flow part, 65A, 65B, 65C, 65D Connection plate, 70 Exhaust passage, 70A Front passage, 70B2, 70B1 Rear passage, 70C, 70D Side passage, 72, 72A, 72B, 93 Side wall, 73A, 73B Waterproof adhesive, 74 Waterproof plate, 74A, 74B Support part, 74C Closure plate, 75 Waterproof sheet, 76 Heat-resistant plate, 77, 78 Thermally conductive adhesive, 80, 96 Elastic part, 81, 97 Adhesive layer, 82 Collection space, 91 Upper plate, 92 Lower plate, 2022 Special surface, C Coolant, D1 Front-to-rear direction, D2 Width direction, D3 Up-down direction, R1 Area, R2 Contact area, R3 smoke extraction space.

Claims

1. a power storage module including a plurality of power storage cells; a housing case that houses the power storage module; a panel member provided below the storage case; a path defining member provided between the housing case and the panel member and defining a smoke exhaust passage; Equipped with Each of the plurality of storage cells includes a cell case and a cell smoke exhaust valve that is provided at the bottom of the cell case and through which exhaust gas in the cell case is exhausted; The storage device has a bottom portion of the housing case formed with a plurality of smoke exhaust holes at positions opposite the cell smoke exhaust valves.

2. When the path defining member and the bottom of the storage case are viewed in plan, The path defining member is a first defining portion formed to surround an area in which the plurality of smoke exhaust holes are formed; a second defining portion that is disposed on an outer circumferential side of the first defining portion and is formed so as to surround the first defining portion, The smoke exhaust passage is formed between the first defining portion and the second defining portion, the first defining portion is formed with at least one first opening portion through which the exhaust gas can flow into the smoke exhaust passage, The power storage device according to claim 1 , wherein the second defining portion has a second open portion formed in the second defining portion at a position shifted from the first open portion in a direction in which the second defining portion extends and communicating with the outside.

3. The storage case further includes a cooler provided on a lower surface thereof, The power storage device according to claim 2 , wherein the first defining portion is provided between the cooler and the panel member.

4. The exhaust gas passage further includes a blast collector, The power storage device according to claim 3 , wherein the blast collecting portion is formed so as to extend from the second defining portion toward the first defining portion.

5. The power storage device according to claim 2 , wherein the second defining portion is formed by fixing a portion of the panel member located outside the first defining portion to a fixing target member and being in close contact with the first defining portion.

6. The storage case includes a lower case located on a lower surface side of the storage case and an upper case disposed above the lower case, the lower case includes a housing portion in which the power storage module is disposed, and an annular bracket unit provided on an outer peripheral surface of the housing portion, the fixed target member is fixed to the bracket unit, The power storage device according to claim 5 , wherein the second defining portion is formed by fixing the panel member to the bracket unit.

7. the power storage device is disposed at the bottom of the vehicle, a plurality of the first opening portions are formed at intervals in the extension direction of the first defining portion, The power storage device according to claim 2 , wherein the second open portion is formed to open toward the rear of the vehicle.

8. a cooler provided on a lower surface of the storage case below the plurality of power storage cells; The plurality of storage cells are arranged in an arrangement direction, the cooler includes a first circulating portion and a second circulating portion that are formed to extend in the arrangement direction and through which a refrigerant flows, the first flow section and the second flow section are arranged at an interval, The electricity storage device according to claim 2 , wherein the cooler has an opening formed in a position facing the cell smoke vent valve.

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