Power storage device and vehicle

Abstract

To provide: a power storage device which can bind, in a lamination direction, a plurality of laminated power storage cells while reducing the number of components; and a vehicle mounted with the power storage device.SOLUTION: A power storage device 10 comprises a power storage module 200, a housing case 100 having a housing space R1, and a binding tool 300. The power storage module 200 is housed in the housing space R1. The housing case 100 includes: a base member 110; a front wall 121 connected to the base member; and a rear wall 122 which is connected to the base member 110, and which is disposed so as to be spaced away from the front wall 121. The front wall 121 includes: a first connection portion 121a connected to the base member 110; and a first bound portion 121b which is located so as to be spaced away in a vertical direction H from the first connection portion 121a. The rear wall 122 includes: a second connection portion 122a connected to the base member 110; and a second bound portion 122b which is located so as to be spaced away in the vertical direction H from the second connection portion 122a. The binding tool 300 is formed such that it binds the first bound portion 121b and the second bound portion 122b.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] For example, Japanese Patent Application Laid-Open Publication No. 2022-55798 (Patent Document 1) discloses an energy storage module including a plurality of stacked energy storage cells and a fastening member. The fastening member includes a pair of end plates and a restraining member. The pair of end plates are arranged at both ends of the plurality of stacked cell stacks in the stacking direction. The restraining member restrains the pair of end plates in the stacking direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2022-55798 Summary of the Invention [Problem to be solved by the invention]

[0004] The electric power storage device mounted on a vehicle includes an electric power storage module and a case. The electric power storage module is housed in the case. The electric power storage module includes a plurality of electric power storage cells. Each of the electric power storage cells expands due to repeated charging and discharging. An external force caused by the expansion of the electric power storage cells is applied to the case.

[0005] For example, the above-mentioned fastening members may be provided to the energy storage module to prevent the case from being deformed by the external force from the energy storage cells, but this increases the number of parts in the energy storage device, which increases the workload for assembling the energy storage device and makes the energy storage device heavier.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and its purpose is to provide an energy storage device and a vehicle equipped with the energy storage device that can restrain multiple stacked energy storage cells in the stacking direction while reducing the number of parts. [Means for solving the problem]

[0007] an energy storage device comprising: an energy storage module; a storage case having a storage space formed therein; and a restraining device; the energy storage module is housed in the storage space; the storage case including a base member, a first sidewall connected to the base member, and a second sidewall connected to the base member and spaced apart from the first sidewall; the first sidewall including a first connection portion connected to the base member and a first restraining portion positioned apart in the vertical direction from the first connection portion; the second sidewall including a second connection portion connected to the base member and a second restraining portion positioned apart in the vertical direction from the second connection portion; and the restraining device formed to restrain the first restraining portion and the second restraining portion.

[0008] 2. The energy storage device of claim 1, wherein the energy storage module includes a plurality of energy storage cells arranged in a first direction, each of the plurality of energy storage cells being formed to extend in a second direction intersecting the first direction, and the restraining device is provided at a position passing through the center of the energy storage cell in the second direction.

[0009] 3. The power storage device according to claim 2, wherein the first side wall has an opening that opens to the storage space and a path that is formed in the first side wall and communicates with the opening. 4. The power storage device according to claim 3, wherein the storage case further includes a partition wall, the storage space having a first storage space and a second storage space, the partition wall being disposed so as to pass through a center between the first side wall and the second side wall in the second direction, and defining the first storage space and the second storage space.

[0010] 4. The energy storage device according to claim 3, wherein the storage case further includes a third sidewall connected to the base member, a fourth sidewall connected to the base member and spaced apart from the third sidewall in the second direction, and a partition wall, the storage space having a first storage space and a second storage space, the partition wall being arranged to pass through a center between the third sidewall and the fourth sidewall in the first direction and defining the first storage space and the second storage space. 5. The energy storage device according to claim 1, wherein the energy storage module includes a plurality of energy storage cells arranged in the first direction, each of the plurality of energy storage cells being formed to extend in a second direction intersecting the first direction, the first sidewall and the second sidewall being spaced apart in the first direction, the storage case further includes a third sidewall connected to the base member and a fourth sidewall connected to the base member and spaced apart from the third sidewall in the second direction, and each of the plurality of energy storage cells being arranged across the third sidewall and the fourth sidewall.

[0011] A vehicle comprising: a vehicle body; and an electricity storage device according to any one of claims 2 to 3, 5, and 6, mounted on the vehicle body, wherein the first direction is a front-to-rear direction of the vehicle.

[0012] A vehicle comprising: a vehicle body; and the electricity storage device according to any one of claims 2 to 4 and 6 mounted on the vehicle body, wherein the first direction is a width direction of the vehicle. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to provide an energy storage device that can restrain a plurality of stacked energy storage cells in the stacking direction while reducing the number of parts, and a vehicle equipped with the energy storage device. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a side view that schematically shows a vehicle and a power storage device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view schematically showing a vehicle frame of a vehicle. [Figure 3]3 shows a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is a perspective view schematically illustrating the electricity storage device. [Figure 5] FIG. 5 is an exploded perspective view of the electricity storage device shown in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 4. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 4. [Figure 8] FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 4. [Figure 9] FIG. 2 is a schematic diagram of a power storage device according to a first modified example of the present embodiment. [Figure 10] FIG. 10 is an exploded perspective view of a power storage device according to a first modified example of the present embodiment. [Figure 11] FIG. 10 is a cross-sectional view taken along the line XI-XI in FIG. 9. [Figure 12] FIG. 10 is a schematic diagram of a power storage device according to a second modified example of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0016] FIG. 1 is a side view schematically showing a vehicle and a power storage device according to this embodiment. The width direction W shown in FIG. 1 indicates the width direction of the vehicle. The stacking direction L indicates the stacking direction of the power storage cells, which will be described later. The up-down direction H indicates the up-down direction of the vehicle. In this embodiment, the stacking direction L coincides with the front-rear direction of the vehicle, and is an example of the "first direction" in the present disclosure. The width direction W is also an example of the "second direction" in the present disclosure.

[0017] The vehicle 1 includes a vehicle frame 2 and an electricity storage device 10. The vehicle 1 is, for example, an electric vehicle that can be driven by a motor, such as an electric vehicle or a hybrid vehicle. The vehicle 1 is equipped with the electricity storage device 10 under the vehicle.

[0018] 2 is a perspective view showing a vehicle frame 2 of a vehicle. The vehicle frame 2 includes side sills 3, cross members 4, and side members 5.

[0019] The side sills 3 are formed to extend in the stacking direction L. The side sills 3 include a left side sill 3a and a right side sill 3b. The left side sill 3a and the right side sill 3b are disposed with an interval in the width direction W.

[0020] The cross member 4 is formed to extend in the width direction W. The cross member 4 is formed to connect the left side sill 3a and the right side sill 3b. The cross member 4 has a front cross member 4a and a rear side member 4b. The front cross member 4a and the rear side member 4b are arranged with a gap in between in the stacking direction L.

[0021] The side members 5 are formed to extend in the stacking direction L. The side members 5 include a left side member 5a and a right side member 5b.

[0022] Figure 3 shows a cross-sectional view taken along line III-III in Figure 2. The left side member 5a is disposed on the vehicle inner side relative to the left side sill 3a in the width direction W. The right side member 5b is disposed on the vehicle inner side relative to the right side sill 3b in the width direction W.

[0023] The left side member 5a and the right side member 5b are each supported by the cross member 4. More specifically, the upper surface of each of the left side member 5a and the right side member 5b is joined to the lower surface of the cross member 4. The lower surface of each of the left side member 5a and the right side member 5b is formed with a through hole 5c through which a screw for connecting the power storage device 10 passes.

[0024] Fig. 4 is a perspective view schematically showing the power storage device, and Fig. 5 is an exploded perspective view of the power storage device shown in Fig. 4.

[0025] In FIG. 5, the power storage device 10 includes a housing case 100, a power storage module 200, a restraint 300, and a cooling device 500.

[0026] The accommodating case 100 forms an accommodating space R1 (not shown) that accommodates the power storage module 200. The accommodating case 100 has an upper cover 400, a base member 110, a peripheral wall 120, and a bottom plate .

[0027] The bottom plate 130 is formed to cover the opening of the base member 110 .

[0028] The power storage module 200 is housed in a housing space R1 (not shown) formed by the housing case 100. The power storage module 200 is formed from a plurality of power storage cells 210.

[0029] The plurality of energy storage cells 210 are stacked in a stacking direction L. The energy storage cells 210 are formed in a rectangular parallelepiped shape extending in a width direction W. One end of each energy storage cell 210 arranged in the width direction W reaches the inner wall of the side wall 123, and the other end reaches the inner wall of the side wall 124.

[0030] The energy storage cell 210 has an electrode assembly and an electrolyte housed therein. When the energy storage cell 210 is charged and discharged, the electrode assembly may expand and contract. When the electrode assembly expands, the energy storage cell 210 expands in the stacking direction L. As a result, the energy storage module 200 expands in the stacking direction L due to the cumulative expansion of the multiple energy storage cells 210. Note that if an internal short circuit or the like occurs in the energy storage cell 210, high-temperature gas may be generated in the energy storage cell 210, and the high-temperature gas may be exhausted from the energy storage cell 210.

[0031] The cooling device 500 is provided so as to cover the lower surface of the power storage module 200. The cooling device 500 is housed in the housing case 100 together with the power storage module 200.

[0032] The upper cover 400 is formed to cover the entire top surface of the storage case 100 .

[0033] The base member 110 is formed in an annular shape. A connection area 110a that faces the lower surface of the peripheral wall 120 is formed on the upper surface of the base member 110.

[0034] The base member 110 includes a side frame 111 , a side frame 112 , a front frame 113 , and a rear frame 114 .

[0035] Each of the side frames 111 and 112 is formed to extend in the stacking direction L. The side frames 111 and 112 are arranged in the width direction W with an interval therebetween.

[0036] The front frame 113 and the rear frame 114 are formed to extend in the width direction and are spaced apart in the stacking direction L.

[0037] The front frame 113 is provided to connect the tip end of the side frame 111 to the front end of the side frame 112. The rear frame 114 is provided to connect the rear end of the side frame 111 to the rear end of the side frame 112.

[0038] Fig. 6 is a cross-sectional view taken along line IV-IV in Fig. 4. In Fig. 6, the upper cover and the electricity storage module are omitted.

[0039] A first connection region 111a and a second connection region 111b are formed on the upper surface of the side frame 111. The first connection region 111a is formed to face a part of the connection portion 120a, which is the lower surface of the peripheral wall 120. The second connection region 111b is formed to face the lower surface of the left side member 5a. A through-hole 110c penetrating in the up-down direction H is formed in the second connection region 111b. The first connection region 111a and the second connection region 111b are arranged side by side in the width direction W.

[0040] A first connection region 112a and a second connection region 112b are formed on the upper surface of the side frame 112. The first connection region 112a is formed to face a part of the connection portion 120a, which is the lower surface of the peripheral wall 120. The second connection region 112b is formed to face the lower surface of the right side member 5b. A through-hole 110c penetrating in the up-down direction H is formed in the second connection region 112b. The first connection region 112a and the second connection region 112b are arranged side by side in the width direction W.

[0041] The first connection region 111a and the first connection region 112a are part of the elements that make up the connection area 110a.

[0042] The electricity storage device 10 is fastened by a bolt 11 and a nut 12 that pass through a through hole 110c of the electricity storage device 10 and a through hole 5c of the side member 5.

[0043] The cooling device 500 is disposed on the upper surface of the bottom plate 130, and is also disposed on the lower surface of the power storage module 200 (not shown). A refrigerant path 500a is formed inside the cooling device 500. A refrigerant 501 flows through the refrigerant path 500a. This allows the cooling device 500 to cool the power storage module 200 from below.

[0044] The lower surface of the bottom plate 130 on which the cooling device 500 is disposed is located on the same plane as the lower surface of the base member 110 .

[0045] 5 again, the peripheral wall 120 is formed in a ring shape so as to rise upward from the connection region 110a of the base member 110. The peripheral wall 120 has a connection portion 120a. The connection portion 120a is formed on the entire lower surface of the peripheral wall 120. The connection portion 120a is formed so as to face the connection region 110a of the base member 110.

[0046] The peripheral wall 120 is joined to the base member 110 at a connection region 110 a of the base member 110 and a connection portion 120 a of the peripheral wall 120 .

[0047] Peripheral wall 120 has front wall 121, rear wall 122, side wall 123, and side wall 124. Note that front wall 121 is an example of a "first side wall" in the present disclosure, rear wall 122 is an example of a "second side wall" in the present disclosure, side wall 123 is an example of a "third side wall" in the present disclosure, and side wall 124 is an example of a "fourth side wall" in the present disclosure.

[0048] The front wall 121 and the rear wall 122 are formed to extend in the width direction W. The front wall 121 and the rear wall 122 are arranged in the stacking direction L with a gap therebetween.

[0049] The front wall 121 is provided to connect the front end of the side wall 123 to the front end of the side wall 124. The rear wall 122 is provided to connect the rear end of the side wall 123 to the rear end of the side wall 124.

[0050] The side walls 123 and 124 are formed to extend in the stacking direction L. The side walls 123 and 124 are arranged in the width direction W with an interval therebetween.

[0051] FIG. 7 is a cross-sectional view taken along line VII-VII shown in FIG.

[0052] The front wall 121 has a first connecting portion 121a. The first connecting portion 121a is the lower surface of the front wall 121. The first connecting portion 121a forms a part of the connecting portion 120a.

[0053] The front wall 121 further has a first constraining portion 121b. The first constraining portion 121b is an outer wall of the front wall 121 and is located at the center in the width direction W. The first constraining portion 121b is located at the upper end of the front wall 121 and around its periphery. The first constraining portion 121b is located at an interval from the first connecting portion 121a in the up-down direction H. A through-hole 121c is formed in the first constraining portion 121b.

[0054] The rear wall 122 has a second connecting portion 122a. The second connecting portion 122a is the lower surface of the rear wall 122. The second connecting portion 122a forms a part of the connecting portion 120a.

[0055] The rear wall 122 further has a second constraining portion 122b. The second constraining portion 122b is arranged on the outer wall of the rear wall 122. The second constraining portion 122b is also on the outer wall of the rear wall 122 and is located at the center in the width direction W. The second constraining portion 122b is located at the upper end of the rear wall 122 and around its periphery. The second constraining portion 122b is located at an interval from the second connecting portion 122a in the up-down direction H. A through-hole 122c is formed in the second constraining portion 122b.

[0056] The restraint device 300 includes a first restraint member 311 , a second restraint member 312 , and a connecting member 320 .

[0057] The first constraining member 311 and the second constraining member 312 are arranged in the stacking direction L.

[0058] First restraining member 311 is provided so as to pass over the upper end of front wall 121 and cover the side surface of front wall 121, and first restraining member 311 is formed so as to cover first restraining portion 121b.

[0059] A through hole 311a is formed in the first restraint member 311, penetrating in the stacking direction L. The first restraint member 311 is restrained to the front wall 121 by a bolt 331 and a nut 332 that pass through the through hole 311a and the through hole 121c.

[0060] The second restraining member 312 is provided so as to pass over the upper end of the rear wall 122 and cover the side surface of the rear wall 122, and the second restraining member 312 is formed so as to cover the second restraining portion 122b.

[0061] The second restraining member 312 has a through hole 312a formed therein, which penetrates in the stacking direction L. The second restraining member 312 is restrained to the rear wall 122 by a bolt 331 and a nut 332 which pass through the through hole 312a and the through hole 122c.

[0062] The connecting member 320 is formed to extend in the stacking direction L. The connecting member 320 connects the first constraining member 311 and the second constraining member 312 together.

[0063] Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 4. In Fig. 8, the upper cover 400 and the power storage module 200 are omitted. A path R2 is formed inside the front wall 121. An opening 121d that opens into the storage space R1 is formed in the inner wall surface of the front wall 121. An opening 121e that opens to the outside is formed in the outer wall surface of the front wall 121. The openings 121d and 121e communicate with the path R2.

[0064] In the above embodiment, the energy storage module 200 in the energy storage device 10 expands in the stacking direction L due to repeated charging and discharging, and a load is applied to the accommodating case 100. In Fig. 5, the restraint device 300 restrains the first restraint portion 121b of the front wall 121 and the second restraint portion 122b of the rear wall 122. The front wall 121 and the rear wall 122 are arranged with a gap in between in the stacking direction L. The front wall 121 is joined to the front frame 113 at the first connection portion 121a. The rear wall 122 is joined to the rear frame 114 at the second connection portion 122a.

[0065] With this configuration, it is possible to provide an energy storage device 10 in which deformation of the peripheral wall 120 in the stacking direction L caused by expansion of the energy storage module 200 is suppressed not only by the base member 110 but also by the restraining device 300.

[0066] In energy storage device 10 according to the present embodiment, front wall 121 and rear wall 122 function as end plates of a conventional energy storage device, and conventional end plates are omitted. Also, restraint device 300 suppresses deformation of front wall 121 and rear wall 122. In this way, it is possible to provide energy storage device 10 that suppresses deformation of casing 100 in stacking direction L while reducing the number of parts.

[0067] In the above embodiment, the first constraining portion 121b is located at the center of the front wall 121 in the width direction W. The second constraining portion 122b is located at the center of the rear wall 122 in the width direction W. As a result, the restraint device 300 is provided at a position that passes through the centers of the multiple energy storage cells 210 in the width direction W.

[0068] With this configuration, the restraining device 300 can restrain the location that experiences the greatest change when the energy storage module 200 expands. This makes it possible to reduce the number of restraining devices 300, and therefore the number of parts in the energy storage device 10.

[0069] In the above embodiment, the front wall 121 is formed with a path R2 formed inside the front wall 121, an opening 121d that opens into the storage space R1 in which the storage module 200 is housed and communicates with the path R2, and an opening 121e that opens to the outside and communicates with the path R2.

[0070] With this configuration, the power storage device 10 can discharge gas discharged from the power storage module 200 to the outside of the power storage device 10 via the path R2.

[0071] In the above embodiment, an example was shown in which the storage case 100 forms the storage space R1, but the present disclosure is not limited to this. For example, the peripheral wall 120 may further have a partition wall that divides the storage space into a first storage space and a second storage space that are arranged in the stacking direction L.

[0072] In this case, the partition wall is formed to extend in the width direction W. One end of the end face of the partition wall arranged in the width direction W is formed to reach the inner wall of the side wall 123, and the other end is formed to reach the inner wall of the side wall 124. The partition wall is arranged to pass through the center of the peripheral wall 120 in the stacking direction L. This allows the partition wall to define the storage case 100 into a first storage space and a second storage space.

[0073] Restraint device 300 includes a restraint band that connects front wall 121 and the partition wall, and a restraint band that connects the partition wall and rear wall 122. In this way, restraint device 300 may be formed by a plurality of restraint bands.

[0074] In this type of electricity storage device, the restraint device 300 can also suppress deformation of the electricity storage module 200 that tends to expand and deform in the stacking direction L.

[0075] In the above embodiment, an example was shown in which the restraining device 300 passes through the center of the cell. However, the present disclosure is not limited to this. For example, a plurality of restraining devices 300 may be provided other than the restraining device 300 that passes through the center of the cell. Furthermore, a plurality of restraining devices 300 may be arranged at equal intervals in the width direction.

[0076] In the above embodiment, an example has been described in which the power storage device 10 is fastened to the side member 5. However, the present disclosure is not limited to this. For example, the power storage device 10 may be mounted on the vehicle by being fastened to a cross member 4.

[0077] In the above embodiment, the vehicle 1 is provided with the power storage device 10 whose deformation is suppressed by the restraint device 300, and thus it is possible to reduce the load applied from the power storage device 10 to the side members 5. As a result, it is possible to suppress deformation of the vehicle frame 2.

[0078] <Variation 1> In the above embodiment, an example has been shown in which the connection area 110a is located on the upper surface of the base member 110 and the connection portion 120a is located on the lower surface of the peripheral wall 120, but the present disclosure is not limited to this. For example, the connection area 110a may be located on the inner peripheral wall of the base member 110 and the connection portion 120a may be located on the outer peripheral wall of the peripheral wall 120. Details will be provided below.

[0079] Fig. 9 is a schematic diagram of a power storage device according to Modification 1 of this embodiment. Fig. 10 is an exploded perspective view of a power storage device according to Modification 1 of this embodiment.

[0080] 10 shows only the casing 101 and the restraint 300, and the restraints 300 are omitted. Unless otherwise specified below, the power storage device 10a is similar to the power storage device 10 in the embodiment of the present disclosure.

[0081] The storage case 101 has a base member 140 and a peripheral wall 150 .

[0082] The base member 140 is formed in an annular shape and includes a side frame 141, a side frame 142, a front frame 143, and a rear frame 144.

[0083] Each of the side frames 141 and 142 is formed to extend in the stacking direction L. The side frames 141 and 142 are positioned in the width direction W with an interval therebetween.

[0084] The front frame 143 and the rear frame 144 are each formed to extend in the width direction W. The front frame 143 and the rear frame 144 are positioned in the stacking direction L with an interval therebetween.

[0085] The front frame 143 is formed to connect the front end of the side frame 141 to the front end of the side frame 142. The rear frame 144 is formed to connect the rear end of the side frame 141 to the rear end of the side frame 142.

[0086] The base member 140 has a first connection region 140a and a second connection region 140b.

[0087] The first connection region 140a is the entire surface of the inner peripheral wall of the base member 140. The first connection region 140a has a first connection region 143a and a first connection region 144a.

[0088] The first connection region 143a is formed on the entire inner wall of the front frame 143. The first connection region 144a is formed on the entire inner wall of the rear frame 144.

[0089] The second connection region 140b is formed on the upper surfaces of the side frames 141 and 142 in a region facing the lower surface of the side member 5.

[0090] Fig. 11 is a cross-sectional view taken along the line XI-XI in Fig. 9. In Fig. 11, the power storage module 200 and the upper cover 400 are omitted.

[0091] The peripheral wall 150 is formed to extend in an annular shape. The peripheral wall 150 has a front wall 151 and a rear wall 152. The front wall 151 and the rear wall 152 are each formed to extend in the width direction W. The front wall 151 and the rear wall 152 are positioned with an interval between them in the stacking direction L.

[0092] The peripheral wall 150 further has a connecting portion 150a. The connecting portion 150a is located on the outer wall of the peripheral wall 150. The connecting portion 150a has a first connecting portion 151a and a second connecting portion 152a.

[0093] The front wall 151 has a first connecting portion 151a and a first restraining portion 151b.

[0094] The first connection portion 151a is formed on the outer wall of the front wall 151 in a region facing the first connection region 143a.

[0095] The first constraining portion 151b is an outer wall of the front wall 151 and is located at the center in the width direction W. The first constraining portion 151b is located at the upper end of the front wall 151 and around its periphery. The first constraining portion 151b is located at a distance from the first connecting portion 151a in the up-down direction H. A through-hole 151c is formed in the first constraining portion 151b.

[0096] The rear wall 152 has a second connecting portion 152a and a second constraining portion 152b.

[0097] The second connection portion 152a is formed on the outer wall of the rear wall 152 in a region facing the first connection region 144a.

[0098] The second constraining portion 152b is an outer wall of the rear wall 152 and is located at the center in the width direction W. The second constraining portion 152b is located at the upper end of the front wall 151 and around the upper end. The second constraining portion 152b is located at a distance from the second connecting portion 152a in the up-down direction H. A through-hole 152c is formed in the second constraining portion 152b.

[0099] The first connecting portion 151a and the second connecting portion 152a form a part of the connecting section 150a.

[0100] As described above, in the embodiment based on the first modification, the peripheral wall 150 is joined to the base member 140 so that the first connection region 140a and the connection portion 150a are in contact with each other.

[0101] <Variation 2> In the above embodiment, an example was shown in which the stacking direction L coincides with the vehicle front-rear direction, but the present disclosure is not limited to this. For example, the stacking direction L may coincide with the width direction. Details will be described below.

[0102] Fig. 12 is a schematic diagram of a power storage device according to Modification 2 of this embodiment. The upper cover 400 is omitted in Fig. 12. Unless otherwise specified below, the power storage device 10b is similar to the power storage device 10 according to the embodiment of the present disclosure.

[0103] 12, the longitudinal direction F indicates the longitudinal direction of the vehicle, and the stacking direction L indicates the stacking direction of the storage cells described below. In the embodiment of the second modification, the stacking direction L coincides with the width direction of the vehicle and is an example of the "first direction" in the present disclosure. The longitudinal direction F is also an example of the "second direction" in the present disclosure.

[0104] The power storage device 10b includes a housing case 102, power storage modules 201 and 202, and restraints 301 and 302.

[0105] The accommodating case 102 accommodates the power storage module 201 and the power storage module 202 in the first accommodating space R3 and the second accommodating space R4. The accommodating case includes a base member 110, a peripheral wall 160, and a partition wall 170.

[0106] The peripheral wall 160 is formed in a ring shape and rises upward from the connection area 110a of the base member 110. The peripheral wall 160 has a connection portion 160a. The connection portion 160a is the lower surface of the peripheral wall 160, and is the surface facing the connection area 110a. The peripheral wall 160 is joined to the base member 110 at the connection area 110a of the base member 110 and the connection portion 160a of the peripheral wall 160.

[0107] Peripheral wall 160 has side wall 161, side wall 162, front wall 163, and rear wall 164. In the embodiment of Modification 2, side wall 161 is an example of a "first side wall" of the present disclosure, side wall 162 is an example of a "second side wall" of the present disclosure, front wall 163 is an example of a "third side wall" of the present disclosure, and rear wall 164 is an example of a "fourth side wall" of the present disclosure.

[0108] The side wall 161 and the side wall 162 are formed to extend in the front-rear direction F. The side wall 161 and the side wall 162 are positioned in the stacking direction L with an interval therebetween.

[0109] The front wall 163 and the rear wall 164 are formed to extend in the stacking direction L. The front wall 163 and the rear wall 164 are positioned in the stacking direction L with an interval therebetween.

[0110] The front wall 163 is provided to connect the front end of the side wall 161 to the front end of the side wall 162. The rear wall 164 is provided to connect the rear end of the side wall 161 to the rear end of the side wall 162.

[0111] The partition wall 170 is formed to extend in the stacking direction L. One end of the end faces of the partition wall 170 arranged in the stacking direction L reaches the inner wall of the side wall 161, and the other end is formed to reach the inner wall of the side wall 162. The partition wall 170 is arranged to pass through the center of the peripheral wall 160 in the front-rear direction F. The partition wall 170 divides the accommodation case 102 into a first accommodation space R3 and a second accommodation space R4.

[0112] The side wall 161 has a first connecting portion 161a and first restraining portions 161b and 161c.

[0113] The first connecting portion 161a is the lower surface of the side wall 161. The first connecting portion 161a forms a part of the connecting portion 160a.

[0114] The first restraining portion 161b is an outer wall of the side wall 161, and is located at the center between the front wall 163 and the partition wall 170 in the front-to-rear direction F. The first restraining portion 161c is an outer wall of the side wall 161, and is located at the center between the partition wall 170 and the rear wall 164 in the front-to-rear direction F. The first restraining portions 161b, 161c are located at a distance from the first connecting portion 161a in the up-down direction H. A through-hole 161d is formed in the first restraining portions 161b, 161c.

[0115] The side wall 162 has a first connecting portion 162a and first restraining portions 162b and 162c.

[0116] The first connecting portion 162a is the lower surface of the side wall 162. The first connecting portion 162a forms a part of the connecting portion 160a.

[0117] The first restraining portion 162b is an outer wall of the side wall 162, and is located at the center between the front wall 163 and the partition wall 170 in the front-to-back direction F. The first restraining portion 162c is an outer wall of the side wall 161, and is located at the center between the partition wall 170 and the rear wall 164 in the front-to-back direction F. The first restraining portions 162b, 162c are located at an interval from the first connecting portion 162a in the up-down direction H. A through-hole 162d is formed in the first restraining portions 162b, 162c.

[0118] The power storage modules 201 and 202 are housed in the first housing space R3 and the second housing space R4 housed in the housing case 102. The power storage modules 201 and 202 are formed from a plurality of power storage cells 210.

[0119] The plurality of storage cells 210 are stacked in a stacking direction L. The storage cells 210 are formed in the shape of a rectangular parallelepiped extending in a front-rear direction F.

[0120] The restraining members 301 and 302 are formed to extend in the stacking direction L. The restraining member 301 is formed to extend from the first restraining portion 161b of the side wall 161 to the first restraining portion 162b of the side wall 162. The restraining member 302 is formed to bridge between the first restraining portion 161c of the side wall 161 and the first restraining portion 162c of the side wall 162.

[0121] In the form of the above-described modified example 2, restraint device 301 is formed to connect first restraint portion 161b and first restraint portion 162b. When configured in this manner, restraint device 301 is provided at a position that passes through the center of power storage module 201 in the front-rear direction F, which forms power storage module 201. Similarly, restraint device 302 is provided at a position that passes through the center of power storage module 201 in the front-rear direction F, which forms power storage module 202.

[0122] With this configuration, the restraining devices 301, 302 can restrain the locations that experience the greatest amount of change when the power storage modules 201, 202 expand. This allows the number of restraining devices 301, 302 to be reduced, and the number of parts in the power storage device 10 to be reduced.

[0123] In the embodiment of the above-described modified example 2, the partition wall 170 partitions the accommodating case 102 into the first accommodating space R3 and the second accommodating space R4, but the present disclosure is not limited to this. For example, the accommodating case 102 may not have the partition wall 170. In this case, the accommodating case 102 forms an accommodating space R1. The energy storage module 200 housed in the accommodating space R1 has energy storage cells 210 arranged in the stacking direction L and formed to extend in the front-rear direction F. One end of the end face of the energy storage cell 210 arranged in the front-rear direction F reaches the inner wall of the front wall 163, and the other end reaches the inner wall of the rear wall 164.

[0124] 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]

[0125] 1 vehicle, 2 vehicle frame, 3 side sill, 4 cross member, 5 side member, 10, 10a, 10b power storage device, 100, 101, 102 storage case, 110, 140 base member, 111, 112, 141, 142 side frame, 111a, 112a, 140a, 143a, 144a first connection area, 111b, 112b, 140b second connection area, 113, 143 front frame, 114, 144 rear frame, 120, 150, 160 peripheral wall, 120a, 150a, 160a connection portion, 121, 151, 163 front wall, 121a, 151a, 161a, 162a First connection portion, 121b, 151b, 161b, 161c, 162b, 162c first restraining portion, 121d, 121e opening, 122, 152, 164 rear wall, 122a, 152a second connection portion, 122b, 152b second restraining portion, 123, 124, 161, 162 side wall, 130 bottom plate, 170 partition wall, 200, 201, 202 energy storage module, 210 energy storage cell, 300, 301, 302 restraint device, F front-to-rear direction, H up-to-down direction, L stacking direction, R1 storage space, R2 path, R3 first storage space, R4 second storage space, W width direction.

Claims

1. The device includes a power storage module, a housing case having a housing space formed therein, and a restraining device, the storage module is accommodated in the accommodation space, the housing case includes a base member, a first side wall connected to the base member, and a second side wall connected to the base member and spaced apart from the first side wall; the first side wall includes a first connection portion connected to the base member and a first restraint portion positioned at a distance from the first connection portion in the up-down direction, the second side wall includes a second connection portion connected to the base member and a second restraint portion positioned at a distance from the second connection portion in the up-down direction, The restraining device is configured to restrain the first restraining portion and the second restraining portion.

2. the energy storage module includes a plurality of energy storage cells arranged in a first direction; Each of the plurality of storage cells is formed to extend in a second direction intersecting the first direction, The power storage device according to claim 1 , wherein the restraining device is provided at a position that passes through a center of the power storage cell in the second direction.

3. The power storage device according to claim 2 , wherein the first side wall has an opening that opens to the storage space, and a path that is formed in the first side wall and communicates with the opening.

4. The storage case further includes a partition wall, The accommodation space includes a first accommodation space and a second accommodation space, The power storage device according to claim 3 , wherein the partition wall is disposed so as to pass through a center between the first side wall and the second side wall in the second direction, and defines the first storage space and the second storage space.

5. the storage case further includes a third side wall connected to the base member, a fourth side wall connected to the base member and spaced apart from the third side wall in the second direction, and a partition wall; The accommodation space includes a first accommodation space and a second accommodation space, The power storage device according to claim 3 , wherein the partition wall is disposed so as to pass through a center between the third side wall and the fourth side wall in the first direction, and defines the first storage space and the second storage space.

6. the energy storage module includes a plurality of energy storage cells arranged in a first direction; Each of the plurality of storage cells is formed to extend in a second direction intersecting the first direction, the first side wall and the second side wall are spaced apart in the first direction, the storage case further includes a third side wall connected to the base member, and a fourth side wall connected to the base member and spaced apart from the third side wall in the second direction, The power storage device according to claim 1 , wherein each of the plurality of power storage cells is arranged across the third side wall and the fourth side wall.

7. The vehicle body, the power storage device according to any one of claims 2 to 3, 5, and 6, which is mounted on the vehicle body; A vehicle equipped with The vehicle, wherein the first direction is a front-to-rear direction of the vehicle.

8. The vehicle body, the power storage device according to any one of claims 2 to 4 and 6 mounted on the vehicle body; A vehicle equipped with The vehicle, wherein the first direction is a width direction of the vehicle.

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