Electricity storage device

Abstract

This electricity storage device is provided with a plurality of electricity storage cells, and a case that houses the plurality of electricity storage cells. The case includes a cooling plate fixed to the plurality of storage cells and a bottom surface. In the power storage device, a hollow member is disposed between a plurality of power storage cells and each of a cooling plate and a bottom surface.

Description

Technical Field

[0001] The present disclosure relates to a power storage device. Background Art

[0002] Japanese Unexamined Patent Application Publication No. 2021-111520 discloses a battery pack including a plurality of battery cells and a battery pack case. The plurality of battery cells are respectively adhered to the bottom surface of the battery pack case.

[0003] Here, when recycling the battery cells, etc., it is necessary to remove the battery cells from the battery pack case. However, in the battery pack described in Japanese Unexamined Patent Application Publication No. 2021-111520, the battery cells are adhered to the bottom surface of the battery pack case, and it is difficult to remove the battery cells (power storage cells). Summary of the Invention

[0004] The present disclosure has been made to solve the above problems, and an object thereof is to provide a power storage device capable of easily removing a power storage cell from a case.

[0005] A power storage device according to one aspect of the present disclosure includes at least one power storage cell and a case that houses the at least one power storage cell. The case includes at least one fixing portion fixed to the at least one power storage cell. A fragile portion is formed between the at least one power storage cell and the at least one fixing portion.

[0006] In the power storage device according to one aspect of the present disclosure, as described above, a fragile portion is formed between the at least one power storage cell and the at least one fixing portion. Thus, the at least one fixing portion can be easily peeled off from the at least one power storage cell starting from the fragile portion. Therefore, the power storage cell can be easily removed from the case.

[0007] Based on the power storage device described in the above aspect, preferably: it further includes a fragile member having a lower rigidity than both the case and the at least one power storage cell. The fragile portion is formed by disposing the fragile member between the at least one power storage cell and the at least one fixing portion. If configured in this way, by disposing the fragile member, a fragile portion can be easily formed between the at least one power storage cell and the at least one fixing portion.

[0008] In this case, preferably: the fragile member includes a hollow member. If configured in this way, the hollow member can be easily broken starting from the hollow space of the hollow member.

[0009] Based on the power storage device in which the fragile member is disposed, preferably: the fragile member is separately provided from the at least one power storage cell and the case. If configured in this way, even if the fragile member is broken, it is possible to suppress breakage of the power storage cell and the case.

[0010] Preferably, the electric storage device configured with the above-mentioned fragile component is provided with an insulating film which is arranged to cover the at least one electric storage cell and the fragile component together. If configured in this way, the fragile component and the electric storage cell are integrally held by the insulating film, so that the fragile component can be easily fixed to the electric storage cell. As a result, the at least one electric storage cell and the fragile component can be treated as a unit. Thereby, the manufacturing process (assembly process) of the electric storage device can be simplified.

[0011] Preferably, the electric storage device configured with the above-mentioned fragile component: the housing includes a cooling device for cooling the at least one electric storage cell. The fragile component is fixed to the cooling device. If configured in this way, a fragile part can be formed by the fragile component, and the electric storage cell can be cooled by the cooling device.

[0012] Preferably, the electric storage device configured with the above-mentioned fragile component: a fracture starting portion serving as a starting point of fracture is provided on the fragile component. If configured in this way, the fragile component can be easily fractured starting from the fracture starting portion. As a result, the at least one fixing portion can be more easily peeled off from the at least one electric storage cell.

[0013] Based on the electric storage device related to the above aspect, preferably: the at least one electric storage cell includes a plurality of electric storage cells. The fragile part is formed between each of the plurality of electric storage cells and the at least one fixing portion. If configured in this way, the housing can be easily peeled off from the plurality of electric storage cells respectively.

[0014] Based on the electric storage device related to the above aspect, preferably: the at least one electric storage cell includes a plurality of electric storage cells. The plurality of electric storage cells are arranged and configured in the first direction. The fragile part is formed to extend in the first direction so as to straddle the region where the plurality of electric storage cells are arranged. If configured in this way, the housing can be peeled off from the plurality of electric storage cells starting from one fragile part. As a result, compared with the case where fragile parts are provided at positions corresponding to the plurality of electric storage cells respectively, the number of fragile parts can be reduced. As a result, it is possible to suppress the rigidity of the electric storage device from becoming excessively low.

[0015] Based on the electric storage device related to the above aspect, preferably the housing includes: a bottom surface that supports the at least one electric storage cell from below; and a top surface that is arranged to cover the at least one electric storage cell from above. The at least one fixing portion includes at least one of the bottom surface and the top surface. If configured in this way, at least one of the bottom surface and the top surface can be easily peeled off from the electric storage cell through the fragile part.

[0016] Based on the electricity storage device involved in the above - mentioned aspect, preferably: at least one of the electricity storage cells has a prismatic shape formed to extend in the second direction. The vulnerable part is formed to extend along the at least one electricity storage cell in the second direction. If configured in this way, compared with the case where the vulnerable part does not extend in the second direction in which the electricity storage cell extends, the vulnerable part can be made larger (longer). As a result, the housing can be more easily peeled off from the electricity storage cell.

[0017] The above - mentioned and other objects, features, aspects, and advantages of the present invention will become clear from the following detailed description related to the present invention understood in association with the drawings. Brief Description of the Drawings

[0018] Figure 1 It is a perspective view showing the structure of an electricity storage device according to an embodiment.

[0019] Figure 2 It is a cross - sectional view of an electricity storage module according to an embodiment.

[0020] Figure 3 It is a perspective view showing the structure of an electricity storage cell and a hollow member according to an embodiment.

[0021] Figure 4 It is along Figure 1 Cross - sectional view taken along line IV - IV.

[0022] Figure 5 It is a cross - sectional view of an electricity storage module according to a first modification of an embodiment.

[0023] Figure 6 It is a cross - sectional view of an electricity storage module according to a second modification of an embodiment.

[0024] Figure 7 It is a cross - sectional view of an electricity storage module according to a third modification of an embodiment.

[0025] Figure 8 It is a cross - sectional view of an electricity storage module according to a fourth modification of an embodiment.

[0026] Figure 9 It is a cross - sectional view of an electricity storage module according to a fifth modification of an embodiment. Detailed Description of the Embodiment

[0027] 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 denoted by the same reference numerals and their description will not be repeated.

[0028] In addition, in this specification, the vertical direction is set as the Z direction. Specifically, the upper side is set as the Z1 side, and the lower side is set as the Z2 side. In addition, the X direction and the Y direction are respectively directions orthogonal to the Z direction (i.e., horizontal directions). The X direction is orthogonal to the Y direction. In addition, the X direction and the Y direction are respectively examples of the "first direction" and the "second direction" of the present disclosure.

[0029] Figure 1 FIG. is a perspective view showing the structure of the power storage device 100 according to the present embodiment. The power storage device 100 is, for example, a device for storing electric power for driving an electric vehicle (not shown). In addition, Figure 1 The X direction shown, for example, is the front-rear direction of the electric vehicle. The Y direction is the left-right direction of the electric vehicle.

[0030] The power storage device 100 includes a plurality of (in the present embodiment, two) power storage modules 10 and a housing 20. In addition, the number of power storage modules 10 is not limited to the above example. The power storage module 10 may be provided as one or three or more.

[0031] Figure 2 FIG. is a cross-sectional view of the power storage module 10. Each of the plurality of power storage modules 10 includes a plurality of power storage cells 11. The plurality of power storage cells 11 are each formed to extend in the Y direction. The plurality of power storage cells 11 are arranged and configured in the X direction. In addition, the plurality of power storage cells 11 may also be respectively configured to extend in the X direction.

[0032] Figure 3 FIG. is a perspective view showing the structure of the power storage cell 11. The power storage cell 11 has a prismatic shape formed to extend in the Y direction. Specifically, the power storage cell 11 has a length L1 in the Y direction. The power storage cell 11 has a length L2 in the X direction. The length L1 is greater than the length L2. In addition, the power storage cell 11 has a height H in the Z direction. The length L1 is greater than the height H. In addition, in Figure 3 for simplicity, only one power storage cell 11 and a hollow member 60 described later are shown.

[0033] Refer again to Figure 1 , the housing 20 houses a plurality of power storage modules 10. The housing 20 includes an upper housing 21, a lower housing 22, and a cooling plate 23. The plurality of power storage modules 10 are housed in a space formed by assembling the upper housing 21 to the lower housing 22. The cooling plate 23 is also housed in the above space. In addition, the cooling plate 23 is an example of the "cooling device" and the "fixing portion" of the present disclosure.

[0034] The upper housing 21 is provided to cover a plurality of power storage modules 10 from the Z1 side. The upper housing 21 has a top surface 21a and a plurality of (e.g., four) side surfaces 21b. The top surface 21a is provided to face the plurality of power storage modules 10 in the Z direction. The plurality of side surfaces 21b are respectively connected to the top surface 21a. Specifically, the plurality of side surfaces 21b are respectively provided to extend from the outer peripheral edge of the top surface 21a toward the Z2 side. When viewed from the Z1 side, the plurality of power storage modules 10 are arranged at positions surrounded by the plurality of side surfaces 21b. In addition, the upper housing 21 is formed of resin, for example.

[0035] The lower housing 22 is provided to support the plurality of power storage modules 10 from the Z2 side. The lower housing 22 has a bottom surface 22a (see Figure 4 ) and a plurality of side surfaces 22b. The bottom surface 22a is provided to face the plurality of power storage modules 10 in the Z direction. The plurality of side surfaces 22b are respectively connected to the bottom surface 22a. Specifically, the plurality of side surfaces 22b are provided to extend from the outer peripheral edge of the bottom surface 22a toward the Z1 side. When viewed from the Z1 side, the plurality of power storage modules 10 are arranged at positions surrounded by the plurality of side surfaces 22b. The upper housing 21 is assembled to the lower housing 22 by connecting the side surface 21b of the upper housing 21 and the side surface 22b of the lower housing 22. In addition, the bottom surface 22a is an example of the "fixing portion" of the present disclosure.

[0036] The cooling plate 23 is provided to cover the plurality of power storage modules 10 from the Z1 side. Specifically, the cooling plate 23 is disposed between the top surface 21a of the upper housing 21 and the plurality of power storage modules 10. A flow path 23a (see Figure 4 ) through which a coolant flows is provided in the cooling plate 23. Each of the plurality of power storage modules 10 is cooled by the coolant flowing in the flow path 23a of the cooling plate 23.

[0037] The power storage device 100 includes a relay box 30. The relay box 30 is arranged on the X1 side with respect to the power storage module 10 on the X1 side. The relay box 30 houses a plurality of relays that control the on / off of the current flowing from the outside of the power storage device 100 to the power storage device 100 (or the current flowing from the power storage device 100 to the outside). In addition, the relay box 30 is also accommodated in the housing 20.

[0038] Figure 4 is a cross-sectional view taken along line IV-IV of Figure 1 . As shown in Figure 4 , each of the plurality of power storage cells 11 is covered with an insulating film 40. Thus, the power storage cells 11 adjacent to each other in the X direction are insulated from each other by the insulating film 40.

[0039] The plurality of insulating films 40 are respectively fixed to the cooling plate 23. Specifically, an adhesive material 50 is filled in the space between the Z1-side end portions of the plurality of insulating films 40 and the cooling plate 23. Thus, each of the plurality of power storage cells 11 is indirectly fixed to the cooling plate 23 via the insulating film 40.

[0040] A plurality of insulating films 40 are respectively fixed to the bottom surface 22a of the lower housing 22. Specifically, an adhesive material 50 is filled in the space between the end portions on the Z2 side of each of the plurality of insulating films 40 and the bottom surface 22a. That is, the plurality of storage battery cells 11 are respectively indirectly fixed to the bottom surface 22a via the insulating films 40.

[0041] Here, when recycling the storage battery cells or the like, it is necessary to remove the storage battery cells from the housing. However, in a conventional power storage device, the storage battery cells are adhered to the housing, so it is not easy to remove the storage battery cells.

[0042] Therefore, in the present embodiment, a hollow member 60 is disposed between each of the plurality of storage battery cells 11 and the cooling plate 23. The rigidity of the hollow member 60 is lower than that of each of the storage battery cell 11 and the housing 20. Thus, the hollow member 60 is more likely to break than each of the storage battery cell 11 and the housing 20. As a result, by breaking the hollow member 60, the cooling plate 23 can be easily peeled off from the plurality of storage battery cells 11. In addition, the hollow member 60 is an example of the "fragile member" of the present disclosure.

[0043] In addition, in the present embodiment, the hollow member 60 is also disposed between each of the plurality of storage battery cells 11 and the bottom surface 22a of the lower housing 22.

[0044] Therefore, in the present embodiment, a fragile portion is formed between each of the plurality of storage battery cells 11 and each of the cooling plate 23 and the bottom surface 22a in such a manner that the hollow member 60 is disposed at the above positions.

[0045] The hollow member 60 is separately provided from each of the plurality of storage battery cells 11. In addition, the hollow member 60 is separately provided from the housing 20. Specifically, the hollow member 60 is respectively fixed to the plurality of storage battery cells 11. In addition, the hollow member 60 does not directly contact the housing 20.

[0046] Specifically, the hollow member 60 is respectively disposed on the end surface 11a on the Z1 side and the end surface 11b on the Z2 side of each of the plurality of storage battery cells 11. Each of the end surface 11a and the end surface 11b is adhered to the hollow member 60 by an adhesive material or the like. In addition, the hollow member 60 may be merely disposed on each of the end surface 11a and the end surface 11b without being adhered by an adhesive material or the like.

[0047] A plurality of insulating films 40 are respectively provided to wrap the storage battery cell 11 and the hollow member 60 together. Specifically, each of the plurality of insulating films 40 wraps a single storage battery cell 11, a hollow member 60 disposed on the end face 11a of the single storage battery cell 11, and a hollow member 60 disposed on the end face 11b of the single storage battery cell 11 as a unit. In addition, each of the plurality of insulating films 40 wraps different storage battery cells 11 from each other.

[0048] As described above, the adhesive material 50 bonds the insulating film 40 to the housing 20 (the cooling plate 23, the bottom surface 22a). Therefore, the hollow member 60 is indirectly fixed to the housing 20 (the cooling plate 23, the bottom surface 22a) via the insulating film 40 by the adhesive material 50.

[0049] In addition, although not shown in the figure, each of the plurality of insulating films 40 is formed to extend in the Y direction in the same shape as the storage battery cell 11. Thus, the adjacent storage battery cells 11 can be more reliably isolated from each other by the insulating film 40. In addition, at least one of the Y1 side and the Y2 side of the storage battery cell 11 (hollow member 60) may be covered by the insulating film 40.

[0050] Refer again to Figure 3 , the hollow member 60 is formed to extend in the Y direction along the storage battery cell 11. Specifically, the hollow member 60 has a prismatic shape extending in the Y direction. A through hole 61 extending in the Y direction is formed in the hollow member 60. The opening of the through hole 61 has a rectangular shape, for example. In addition, the above opening may have other shapes (for example, a circular shape). In addition, the hollow member 60 may have a cylindrical shape, for example.

[0051] The hollow member 60 has a length L11 in the Y direction. The hollow member 60 has a length L12 in the X direction. The length L11 is greater than the length L12. The length L11 in the Y direction of the hollow member 60 is less than the length L1 in the Y direction of the storage battery cell 11. The length L12 in the X direction of the hollow member 60 is less than the length L2 in the X direction of the storage battery cell 11. In addition, the relationship between the sizes of the hollow member 60 and the storage battery cell 11 is not limited to the above example.

[0052] A cutout 62 serving as a starting point for rupture is provided in the hollow member 60. In addition, a peeling device 70 is provided in the power storage device 100 at a position in the Z direction corresponding to the cutout 62 of the hollow member 60 on the Z1 side (refer to Figure 1)。The stripping device 70 is mounted on the side surface on the X1 side of each power storage module 10. The stripping device 70 is arranged to extend in the Y direction along the above-mentioned side surface. For example, in a state where the stripping device 70 is gripped by a clamp (device) (not shown), the stripping device 70 is moved toward the X2 side by the above-mentioned clamp (device), thereby cutting the hollow member 60 starting from the cut 62. Thereby, the upper housing 21 is stripped from the power storage module 10. In addition, the stripping device 70 also serves as a mark (label) for the cutting position of the hollow member 60. In addition, the stripping device 70 may be arranged at a position in the Z direction corresponding to the cut 62 of the hollow member 60 on the Z1 side. In addition, the cut 62 is an example of the "rupture starting portion" of the present disclosure.

[0053] As described above, in the present embodiment, the hollow member 60 is arranged between each of the plurality of power storage cells 11 and the housing 20 (the cooling plate, the bottom surface 22a of the lower housing 22). Thereby, by rupturing the hollow member 60 having relatively low mechanical strength, the housing 20 (the cooling plate, the bottom surface 22a) can be stripped from the power storage cell 11. As a result, the housing 20 can be stripped from the power storage cell 11 with a relatively small force, so that the stripping process can be simplified. In addition, the device (clamp) that can be used for the above-mentioned stripping can be miniaturized (simplified). Therefore, the power storage cell 11 can be easily removed from the housing 20.

[0054] In the above embodiment, an example in which the hollow member 60 is provided for each power storage cell 11 is shown, but the present disclosure is not limited thereto. The hollow member 60 may not be provided for each power storage cell 11.

[0055] For example, as Figure 5 shown in the example, the hollow member 60 is provided across a region where a plurality of (in Figure 5 , two) power storage cells 11 are arranged. In other words, the hollow member 60 is arranged to straddle the end faces 11a (end faces 11b) of the plurality of power storage cells 11 arranged along the X direction. In this case, as Figure 5 shown, the insulating film 40 is not provided.

[0056] In addition, as a Figure 5 modification, it may also be configured that, on one of the Z1 side and the Z2 side, the hollow member 60 is arranged to straddle a plurality of power storage cells 11, and on the other of the Z1 side and the Z2 side, the hollow member 60 is provided for each power storage cell 11. In addition, the above-mentioned plurality of power storage cells 11 and the hollow member 60 may be covered by one insulating film. In addition, the number of power storage cells 11 straddled by the hollow member 60 may be three or more.

[0057] In the above-described embodiment, an example is shown in which the electricity storage cell 11 and the hollow member 60 are integrally covered with the insulating film 40, but the present disclosure is not limited thereto. The insulating film 40 may not be provided.

[0058] In the above-described embodiment, an example is shown in which the electricity storage cell 11 (insulating film 40) is fixed to the cooling plate 23, but the present disclosure is not limited thereto. The cooling plate 23 may not be disposed on the Z1 side of the electricity storage cell 11.

[0059] In Figure 6 In the example shown, each of the plurality of electricity storage cells 11 (insulating film 40) is fixed to the top surface 21a of the upper housing 21 by the adhesive material 50. Further, a cooling plate 123 is provided between the bottom surface 22a of the lower housing 22 and the plurality of electricity storage cells 11 (insulating film 40). A flow path 123a through which the coolant flows is formed in the cooling plate 123. In this case, the top surface 21a and the cooling plate 123 are each an example of the "fixing portion" of the present disclosure.

[0060] In addition, the cooling plate may not be provided on either the Z1 side or the Z2 side of the electricity storage cell 11.

[0061] In the above-described embodiment, an example is shown in which a hollow member 60 is disposed between the electricity storage cell 11 and the housing 20 to form a fragile portion between the electricity storage cell 11 and the housing 20, but the present disclosure is not limited thereto. The fragile portion may be formed without disposing a fragile member such as the hollow member 60.

[0062] In Figure 7 In the example shown, instead of disposing the hollow member 60, the plurality of electricity storage cells 11 are bonded to the housing 20 (the cooling plate 23, the bottom surface 22a of the lower housing 22) by the adhesive material 150 in which air bubbles 151 are formed. The air bubbles 151 are formed between each of the plurality of electricity storage cells 11 and the housing 20 (the cooling plate 23, the bottom surface 22a). Thus, a fragile portion of the adhesive material 150 is formed due to the formation of the air bubbles 151. The air bubbles 151 may also extend in the X direction so as to straddle the region where the plurality of electricity storage cells 11 are disposed. Further, in Figure 7 In the example shown, the insulating film 40 is not provided. The air bubbles 151 are an example of the "fragile portion" of the present disclosure.

[0063] In the above-described embodiment, an example is shown in which the hollow member 60 is separately provided from the electricity storage cell 11 and the housing 20, but the present disclosure is not limited thereto. The hollow member 60 may also be integrally formed with the electricity storage cell 11 or the housing 20.

[0064] In Figure 8In the example shown, the hollow portion is integrally formed with the housing. The upper housing 121 includes a top surface 121a and a plurality of hollow portions 121b. The plurality of hollow portions 121b are integrally formed with the top surface 121a. Specifically, the plurality of hollow portions 121b are respectively provided to protrude from the top surface 121a toward the storage battery cell 11. A cutout 121c is provided in the hollow portion 121b. In addition, although not shown in the figure, the hollow portion may be integrally formed with the lower housing, or the hollow portion may be integrally formed with both the upper housing and the lower housing. In addition, in Figure 8 the case of the example shown, the top surface 121a is an example of the "fixing portion" of the present disclosure. In addition, the hollow portion 121b is an example of the "fragile portion" of the present disclosure.

[0065] In Figure 9 the example shown, the storage battery cell is integrally formed with the hollow member. The storage battery cell 111 is integrally formed with the hollow member 160. Specifically, the hollow member 160 is provided to protrude from the storage battery cell 111 toward the Z1 side. A cutout 161 is provided in the hollow member 160. In addition, although not shown in the figure, the hollow member 160 may also be provided to protrude from the storage battery cell 111 toward the Z2 side. The hollow member 160 may also be provided to protrude from the storage battery cell 111 toward both the Z1 side and the Z2 side. In addition, the hollow member 160 and the cutout 161 are respectively an example of the "fragile member" and the "rupture starting point portion" of the present disclosure.

[0066] In the above-described embodiment, an example of forming a fragile portion by arranging the hollow member 60 is shown, but the present disclosure is not limited thereto. For example, a fragile portion may also be formed by arranging a member having a relatively low mechanical strength on one side that is not a hollow shape.

[0067] In the above-described embodiment, an example of providing a plurality of storage battery cells 11 in the storage battery module 10 is shown, but the present disclosure is not limited thereto. For example, the storage battery module may also have only one storage battery cell.

[0068] In the above-described embodiment, an example of providing a cutout as the rupture starting point portion in the hollow member is shown, but the present disclosure is not limited thereto. For example, a structure other than a cutout (such as a hole) may also be used as the rupture starting point portion. In addition, a rupture starting point portion such as a cutout may not be provided in the hollow member.

[0069] In the above-described embodiment, an example of arranging the hollow members 60 on the Z1 side and the Z2 side of the storage battery cell 11 respectively is shown, but the present disclosure is not limited thereto. The hollow member 60 may also be arranged only on either the Z1 side or the Z2 side of the storage battery cell 11.

[0070] In addition, the structures (processes) of the above-described embodiment and the above-described respective modification examples may also be combined with each other.

[0071] The embodiments of the present invention have been described, but all points of the embodiments disclosed this time should be considered illustrative and not restrictive of the present invention. The scope of the present invention is represented by the claims and is intended to include the equivalent meaning of the claims and all modifications within its scope.

Claims

1. A power storage device, wherein, the power storage device includes: at least one power storage cell; and a housing that houses the at least one power storage cell, the housing includes at least one fixing portion fixed to the at least one power storage cell, a fragile portion is formed between the at least one power storage cell and the at least one fixing portion.

2. The power storage device according to claim 1, wherein, it further includes a fragile member having a lower rigidity than both the housing and the at least one power storage cell, the fragile portion is formed by disposing the fragile member between the at least one power storage cell and the at least one fixing portion.

3. The power storage device according to claim 2, wherein, the fragile member includes a hollow member.

4. The power storage device according to claim 2 or 3, wherein, the fragile member is separately provided from the at least one power storage cell and the housing respectively.

5. The power storage device according to claim 2 or 3, wherein, it further includes an insulating film that is provided to cover the at least one power storage cell and the fragile member together.

6. The power storage device according to claim 2 or 3, wherein, the housing includes a cooling device for cooling the at least one power storage cell, the fragile member is fixed to the cooling device.

7. The power storage device according to claim 2 or 3, wherein, a fracture starting portion that becomes a starting point of fracture is provided on the fragile member.

8. The power storage device according to any one of claims 1 to 3, wherein, the at least one power storage cell includes a plurality of power storage cells, the fragile portion is formed between each of the plurality of power storage cells and the at least one fixing portion.

9. The power storage device according to any one of claims 1 to 3, wherein, the at least one power storage cell includes a plurality of power storage cells, the plurality of power storage cells are arranged and configured in a first direction, the fragile portion is formed to extend in the first direction so as to span a region where the plurality of power storage cells are arranged.

10. The power storage device according to any one of claims 1 to 3, wherein, the housing includes: a bottom surface that supports the at least one power storage cell from below; and a top surface that is provided to cover the at least one power storage cell from above, the at least one fixing portion includes at least one of the bottom surface and the top surface.

11. The power storage device according to any one of claims 1 to 3, wherein, the at least one power storage cell has a prismatic shape formed to extend in a second direction, the fragile portion is formed to extend along the at least one power storage cell in the second direction.

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