Power storage device

Abstract

To provide a power storage device capable of suppressing damage caused by impacts from the surrounding area.SOLUTION: A power storage device 3 mounted on a vehicle 1 includes: a stack 7 formed by stacking storage modules 11 in a vertical direction H; and a storage case 10 for storing the stack 7. The storage case 10 includes: a top plate 19 located on the top surface of the storage case 10; a bottom plate 22 located on the bottom surface of the storage case 10; a peripheral wall 28 connecting the top plate 19 and the bottom plate 22; and a holding member 18. The stack 7 includes an upper surface 13 and a lower surface 14, and a peripheral surface 15 connecting the upper surface 13 and the lower surface 14. The holding member 18 has a retaining wall 25 and a retaining flange 27. The retaining wall 25 is formed to cover the peripheral surface 15, and the retaining flange 27 is provided on the holding upright wall 25 and fixed to the peripheral wall 28.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] For example, Japanese Patent Application Laid-Open Publication No. 2024-007753 discloses the configuration of the side portion of a bipolar battery mounted under a vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2024-007753 Summary of the Invention [Problem to be solved by the invention]

[0004] The battery disclosed in Patent Document 1 is vulnerable to shocks from the surroundings, and there is room for improvement in protecting the battery from shocks from the surroundings.

[0005] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide an electricity storage device that can be prevented from being damaged by impacts from the surroundings. [Means for solving the problem]

[0006] An energy storage device according to a first aspect of the present disclosure is an energy storage device mounted on a vehicle, and includes a stack formed by stacking energy storage modules in the vertical direction, and a storage case that houses the stack, wherein the storage case includes a top plate located on the upper surface of the storage case, a bottom plate located on the lower surface of the storage case, a peripheral wall connecting the top plate and the bottom plate, and a retaining member, the stack includes an upper surface and a lower surface and a peripheral surface connecting the upper surface and the lower surface, the retaining member has a retaining upright wall and a retaining flange, the retaining upright wall is formed to cover the peripheral surface, and the retaining flange is provided on the retaining upright wall and fixed to the peripheral wall.

[0007] In the electricity storage device according to the first aspect of the present disclosure, the holding upright wall includes a first side wall and a second side wall arranged in the width direction, and the holding flange is fixed to at least one of the first side wall and the second side wall.

[0008] 3. The energy storage device according to claim 1, wherein the retaining member in the energy storage device according to the first aspect of the present disclosure further includes a covering member, the covering member being formed to extend in an annular shape from at least one of the ends of the retaining upright wall that are arranged in the vertical direction, and to cover an outer edge portion of the stack when the stack is viewed in plan from a position vertically spaced from the stack.

[0009] The covering member in the energy storage device according to the first aspect of the present disclosure includes an upper end covering portion connected to the upper end of the retaining upright wall, and the upper end covering portion is adhered to a portion of the top plate that corresponds to the upper end covering portion in the vertical direction.

[0010] The holding member in the power storage device according to the first aspect of the present disclosure is adhered to the laminate. [Effects of the Invention]

[0011] According to the power storage device according to the present disclosure, damage to the power storage device can be suppressed even when an impact is applied from the surroundings. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a plan view showing a schematic configuration of an electricity storage device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Figure 3] 2 is a schematic perspective view of a stack and a holding member in the electricity storage device of FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0014] 1 is an exploded perspective view showing a schematic view of a vehicle equipped with a power storage device according to this embodiment. The up-down direction H shown in FIG. 1 indicates the up-down direction of the vehicle 1. The width direction W indicates the width direction of the vehicle 1. The front-rear direction D indicates the front-rear direction of the vehicle 1.

[0015] Vehicle 1 includes a vehicle body 2 and an electricity storage device 3. Vehicle 1 includes, for example, a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), or a fuel cell electric vehicle (FCEV).

[0016] The vehicle body 2 includes an underbody 4 and a shear panel 5. The underbody 4 has a pair of side shells 4a, 4b arranged in a width direction W. The shear panel 5 is disposed in a position facing the underbody 4 in the up-down direction H, with the electricity storage device 3 sandwiched between them. The shear panel 5 is fixed to the underbody 4.

[0017] The power storage device 3 is, for example, a device for storing electric power for driving the vehicle 1. The power storage device 3 is fixed to the vehicle body 2 by being fastened to each of the pair of side shells 4a, 4b.

[0018] Fig. 2 is a cross-sectional view taken along line II-II of Fig. 1. The electricity storage device 3 has a laminate 7, an insulating sheet 8, an elastic sheet 9, and a housing case 10.

[0019] The laminate 7 is formed, for example, in the shape of a rectangular parallelepiped. The laminate 7 has an upper surface 13, a lower surface 14, and a peripheral surface 15. The upper surface 13 and the lower surface 14 are surfaces arranged in the up-down direction H. The upper surface 13 is a surface located closer to the underbody 4 than the lower surface 14. The peripheral surface 15 is a surface connecting the outer peripheral edge of the upper surface 13 and the outer peripheral edge of the lower surface 14.

[0020] The stack 7 has a power storage module 11 and a cooling device 12. The power storage module 11 is, for example, a bipolar battery. When the power storage module 11 is viewed from a position spaced apart from the power storage module 11 in the up-down direction H, the power storage module 11 has a rectangular shape. The power storage modules 11 are stacked in the up-down direction H with the cooling device 12 sandwiched therebetween.

[0021] The cooling device 12 is electrically conductive. Therefore, the cooling device 12 electrically connects the power storage modules 11 adjacent to the cooling device 12 in the vertical direction H. The cooling device 12 has a flow path 12a therein. The cooling device 12 can cool the power storage modules 11 by allowing a refrigerant to flow through the flow path 12a.

[0022] The insulating sheet 8 is made of an insulating material. The insulating sheet 8 is provided on each of the upper surface 13 and the lower surface 14 of the laminate 7. The elastic sheet 9 is made of an elastic body. The elastic sheet 9 is disposed on the insulating sheet 8.

[0023] The storage case 10 has an upper cover 16, a lower case 17, and a holding member 18.

[0024] The upper cover 16 is formed by a top plate 19, an upper flange 20, and a hanging wall 21.

[0025] The top plate 19 is located on the upper surface of the case 10. The top plate 19 is formed so as to cover the upper surface 13 of the stack 7. The top plate 19 is a member formed in a plate shape. When viewed from a position spaced apart from the top plate 19 in the up-down direction H, the top plate 19 is formed in a rectangular shape.

[0026] The upper flange 20 is formed to extend in the width direction W. The top plate 19 and the upper flange 20 are arranged at an interval in the up-down direction H. The upper flange 20 has a first upper flange 20a and a second upper flange 20b. The first upper flange 20a and the second upper flange 20b are arranged at an interval in the width direction W, with the laminate 7 sandwiched between them. The first upper flange 20a and the second upper flange 20b are arranged on the same plane in the up-down direction H.

[0027] The hanging wall 21 connects the top plate 19 and the upper flange 20. More specifically, the hanging wall 21 has a first hanging wall 21a and a second hanging wall 21b. The first hanging wall 21a and the second hanging wall 21b are arranged in the width direction W. The first hanging wall 21a connects the other end of the top plate 19 arranged in the width direction W to one end of the first upper flange 20a arranged in the width direction W. The second hanging wall 21b connects the other end of the top plate 19 arranged in the width direction W to one end of the second upper flange 20b arranged in the width direction W.

[0028] The lower case 17 is formed to open upward and is composed of a bottom plate 22, a lower flange 23, and an upright wall 24.

[0029] The bottom plate 22 is located on the underside of the case of the storage case 10. The bottom plate 22 is a member formed in a plate shape. When viewed from above from a position spaced apart from the bottom plate 22 in the up-down direction H, the bottom plate 22 is formed in a shape that makes its outer shape the same as that of the top plate 19. The bottom plate 22 is disposed at a distance from the top plate 19 in the up-down direction H, with the stacked body 7 sandwiched therebetween.

[0030] The lower flange 23 is formed to extend in the width direction W. The top plate 19 and the lower flange 23 are arranged at an interval in the up-down direction H. The lower flange 23 has a first lower flange 23a and a second lower flange 23b. The first lower flange 23a and the second lower flange 23b are arranged at an interval in the width direction W, with the laminate 7 sandwiched between them. The first lower flange 23a and the second lower flange 23b are arranged on the same plane in the up-down direction H.

[0031] The upright wall 24 connects the bottom plate 22 and the lower flange 23. More specifically, the upright wall 24 has a first upright wall 24a and a second upright wall 24b. The first upright wall 24a and the second upright wall 24b are arranged in the width direction W. The first upright wall 24a connects one end of the bottom plate 22 arranged in the width direction W to one end of the first lower flange 23a arranged in the width direction W. The second upright wall 24b connects the other end of the bottom plate 22 arranged in the width direction W to one end of the second lower flange 23b arranged in the width direction W.

[0032] Fig. 3 is a schematic perspective view showing the stack and the holding member in the electricity storage device of Fig. 1. The holding member 18 is formed by a holding upright wall 25, a covering member 26, and a holding flange 27.

[0033] The holding upright wall 25 is formed to extend in an annular shape so as to cover the peripheral surface 15 of the stack 7. The holding upright wall 25 has a first side wall 25a and a second side wall 25b. The first side wall 25a is arranged at one end of the holding upright wall 25 arranged in the width direction W, and the second side wall 25b is arranged at the other end.

[0034] The covering member 26 has an upper end covering portion 26a and a lower end covering portion 26b. The upper end covering portion 26a is formed in an annular shape so as to cover the outer edge portion of the upper surface 13 of the stack 7 and the vicinity thereof. The upper end covering portion 26a is connected to an upper portion of the holding upright wall 25, which is an end portion arranged in the up-down direction H.

[0035] The lower end covering portion 26b is formed in a ring shape so as to cover the outer edge portion of the lower surface 14 of the laminate 7 and the vicinity thereof. The lower end covering portion 26b is connected to a portion of the holding upright wall 25 that is located below and is an end portion arranged in the up-down direction H.

[0036] The retaining flange 27 is formed to extend in the width direction W from the upright wall 24. More specifically, the retaining flange 27 has a first retaining flange 27a and a second retaining flange 27b. The first retaining flange 27a and the second retaining flange 27b are arranged on the same plane in the up-down direction H. The first retaining flange 27a is formed to extend in the width direction W from the first side wall 25a. The second retaining flange 27b is formed to extend in the width direction W from the second side wall 25b.

[0037] Referring again to FIG. 2, the upper end covering portion 26a is bonded to the top plate 19 with a first adhesive A1 at a portion of the top plate 19 corresponding to the up-down direction H of the upper end covering portion 26a.

[0038] The holding member 18 is adhered to the laminate 7 by a second adhesive A2. Specifically, the second adhesive A2 is applied to the peripheral surface 15 of the laminate 7, the outer edge of the upper surface 13 and a region therearound that corresponds to the upper end covering portion 26a, and the outer edge of the lower surface 14 and a region therearound that corresponds to the lower end covering portion 26b.

[0039] The storage case 10 is formed from a top plate 19, a bottom plate 22, and a peripheral wall 28. The top plate 19 is located on the upper surface of the storage case 10 in the vertical direction H. The bottom plate 22 is located on the lower surface of the storage case 10 in the vertical direction H. The peripheral wall 28 is formed to connect the outer peripheral edge of the top plate 19 with the outer peripheral edge of the bottom plate 22. The peripheral wall 28 is formed from an upper flange 20, a hanging wall 21, a lower flange 23, and an upright wall 24. The upper flange 20 and the lower flange 23 are fixed to each other in the vertical direction H, with a retaining flange 27 sandwiched between them. In other words, the retaining flange 27 is fixed to the peripheral wall 28.

[0040] The first upper flange 20a, the first lower flange 23a, and the first retaining flange 27a are fixed to the side shell 4a shown in Fig. 1. The second upper flange 20b, the second lower flange 23b, and the second retaining flange 27b are fixed to the side shell 4b.

[0041] The shared panel 5 is disposed below the lower case 17 of the energy storage device 3 in the vertical direction H. The shared panel 5 is formed to open upward. A space R is formed between the shared panel 5 and the lower case 17. The shared panel 5 is formed of a steel plate. The shared panel 5 has a main body 29 and a pair of connecting portions 30.

[0042] The pair of connecting portions 30 are arranged at an interval in the width direction W. One ends of the pair of connecting portions 30 are connected by the main body portion 29. The other ends of the pair of connecting portions 30 are joined to the outer peripheral edge portion of the bottom plate 22. In this way, the shear panel 5 is fixed to the storage case 10.

[0043] In the space R, a first reinforcement 31 and a second reinforcement 32 are arranged. The first reinforcement 31 is disposed in the space R and fixed to the underside 17a of the lower case 17. A plurality of first reinforcements 31 are arranged at intervals in the width direction W. The first reinforcement 31 has a pair of joints 33, a main body 34, and a connection portion 35. The joints 33 are arranged at intervals in the width direction W. The main body 34 is disposed between and below the pair of joints 33. The connection portion 35 connects each end of the pair of joints 33 to each outer peripheral end of the main body 34 arranged in the width direction W. The main body 34 and the connection portion 35 are formed to protrude downward from the joints 33. The first reinforcement 31 is fixed to the lower case 17 by fixing the joints 33 to the underside 17a of the lower case 17.

[0044] The second reinforcement 32 is disposed in the space R and fixed to the upper surface 5a of the shear panel 5. The multiple second reinforcements 32 are arranged at intervals in the width direction W. The second reinforcement 32 has a pair of joints 36, a main body 37, and a connection portion 38. The joints 36 are arranged at intervals in the width direction W. The main body 37 is disposed between and above the pair of joints 36. The connection portion 38 connects each end of the pair of joints 36 to each outer peripheral end of the main body 34 arranged in the width direction W. The main body 37 and the connection portion 38 are formed to protrude upward relative to the joints 36. The second reinforcement 32 is fixed to the shear panel 5 by fixing the joints 36 to the upper surface 5a of the shear panel 5.

[0045] Each of the plurality of second reinforcements 32 arranged in the space R is arranged between the first reinforcements 31. As a result, in the space R, the first reinforcements 31 and the second reinforcements 32 are arranged alternately in the width direction W.

[0046] The stack 7 in the above embodiment is restrained by the holding member 18. The stack 7 is arranged in the storage case 10 with a gap between it and the lower case 17 in the up-down direction H. This configuration makes it easy to transport the stack 7 by using the holding member 18 as a grip. When an impact is applied to the storage case 10 from below to above in the up-down direction H, it is possible to prevent the load from being transmitted to the stack 7.

[0047] In the above embodiment, the peripheral surface 15 of the stack 7 housed in the housing case 10 is protected by the holding members 18. With this configuration, an impact applied to the vehicle 1 from the surroundings is transmitted to the stack 7 through the holding members 18. Because the holding members 18 are in surface contact with the stack 7, it is possible to prevent localized loads from being applied to the stack 7 and to prevent concentrated loads on the energy storage modules 11. It is also possible to prevent the multiple energy storage modules 11 stacked in the vertical direction H from sliding in the width direction W. This in turn makes it possible to prevent damage to the energy storage modules 11 due to impacts from the surroundings.

[0048] In the above embodiment, the holding member 18 that restrains the stack 7 accommodated in the storage case 10 is fixed to the peripheral wall 28. With this configuration, when an impact is applied to the storage case 10 from the width direction W, the fixed portion between the peripheral wall 28 and the holding member 18 comes off, thereby preventing the impact load from being transmitted to the stack 7.

[0049] In the above embodiment, the upper end covering portion 26a of the holding member 18 is bonded to the top plate 19 by the first adhesive A1 at a portion of the top plate 19 that corresponds to the upper end covering portion 26a in the up-down direction. By adopting such a configuration, the load applied to the holding member 18 can be transmitted to the upper cover 16.

[0050] In the above embodiment, the holding upright wall 25 is formed to extend in an annular shape so as to cover the entire circumferential surface 15 of the stack 7, but the present disclosure is not limited thereto. For example, the holding upright wall 25 may be formed to cover only the surface of the circumferential surface 15 of the stack 7 that is aligned in the width direction W. Specifically, the holding upright wall 25 may be formed only by the first side wall 25a and the second side wall 25b. Alternatively, the holding upright wall 25 may be formed to cover only the surface of the circumferential surface 15 of the stack 7 that is formed parallel to the front-rear direction D.

[0051] In the above embodiment, the holding member 18 has the covering member 26, but the present disclosure is not limited to this. For example, the holding member 18 does not have to have the covering member 26.

[0052] In the above embodiment, the covering member 26 has the upper end covering portion 26a and the lower end covering portion 26b, but the present disclosure is not limited to this. The covering member 26 may have only one of the upper end covering portion 26a or the lower end covering portion 26b.

[0053] In the above embodiment, the retention flange 27 has the first retention flange 27a and the second retention flange 27b, but the present disclosure is not limited to this. For example, the retention flange 27 may have only one of the first retention flange 27a and the second retention flange 27b. Furthermore, the retention flange 27 may be formed to extend annularly from the upright retention wall 25.

[0054] 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 description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0055] REFERENCE SIGNS LIST 1 vehicle, 2 vehicle body, 3 power storage device, 4 underbody, 4a, 4b side shell, 5 shear panel, 5a upper surface, 7 laminated body, 8 insulating sheet, 9 elastic sheet, 10 storage case, 11 power storage module, 12a flow path, 13 upper surface, 14 lower surface, 15 peripheral surface, 16 upper cover, 17 lower case, 17a lower surface, 18 retaining member, 19 top plate, 20 upper flange, 20a first upper flange, 20b second upper flange, 21 hanging wall, 21a first hanging wall, 21b second hanging wall, 22 bottom plate, 23 lower flange, 23a first lower flange, 23b second lower flange, 24 standing wall, 24a first standing wall, 24b second standing wall, 25 retaining standing wall, 25a First side wall, 25b second side wall, 26 covering member, 26a upper end covering portion, 26b lower end covering portion, 27 retaining flange, 27a first retaining flange, 27b second retaining flange, 28 peripheral wall, 29 main body portion, 30 connecting portion, 31 first reinforcement, 32 second reinforcement, 33 joint portion, 34 main body portion, 35 connecting portion, 36 joint portion, 37 main body portion, 38 connecting portion, A1 first adhesive, A2 second adhesive, R space.

Claims

1. A power storage device mounted on a vehicle, the power storage device includes a stack formed by stacking power storage modules in a vertical direction, and a housing case that houses the stack; the storage case includes a top plate located on an upper surface of the storage case, a bottom plate located on a lower surface of the storage case, a peripheral wall connecting the top plate and the bottom plate, and a holding member; the laminate includes an upper surface, a lower surface, and a peripheral surface connecting the upper surface and the lower surface; The retaining member has a retaining upright wall and a retaining flange, The holding upright wall is formed to cover the peripheral surface, The holding flange is provided on the holding upright wall and fixed to the peripheral wall of the electricity storage device.

2. The support wall includes a first side wall and a second side wall arranged in a width direction, The power storage device according to claim 1 , wherein the holding flange is fixed to at least one of the first side wall and the second side wall.

3. The holding member further includes a covering member, 3. The energy storage device according to claim 1, wherein the covering member is formed so as to extend in a ring shape from at least one of the ends of the retaining upright wall arranged in the vertical direction, and is formed so as to cover an outer edge portion of at least one of the upper surface and the lower surface of the stack.

4. the covering member includes an upper end covering portion connected to an upper end of the holding upright wall, The power storage device according to claim 3 , wherein the upper end covering portion is adhered to a portion of the top plate that corresponds to the upper end covering portion in the up-down direction.

5. The power storage device according to claim 1 or 2, wherein the holding member is adhered to the stack.

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