Electricity storage device and vehicle

Abstract

The utility model relates to an electric power storage device and a vehicle. The electric power storage device (10) is provided with an electric power storage module (200), a containing shell (100) with a containing space R1, and a restraining piece (300). The storage module is housed in the housing space R1, and the housing case includes a base member 110, a front wall 121 connected to the base member 110, and a rear wall 122 connected to the base member 110 and disposed at a distance from the front wall 121. The front wall includes a first connecting portion (121a) connected to the base member, and a first restraining portion (121b) spaced apart from the first connecting portion in the vertical direction (H). The rear wall includes a second connecting portion (122a) connected to the base member, and a second restraining portion (122b) spaced apart from the second connecting portion (122a) in the vertical direction. The restraining member is formed so as to restrain the first restraining portion and the second restraining portion.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a power storage device and a vehicle. BACKGROUND

[0002] For example, Japanese Patent Application Publication No. 2022-55798 discloses a power storage module provided with a plurality of power storage cells and a fastening member that are stacked. The fastening member includes a pair of end plates and a restraint member. The pair of end plates is disposed at both ends of the plurality of stacked power storage cells in a stacking direction. The restraint member restrains the pair of end plates in the stacking direction.

[0003] A power storage device mounted on a vehicle is provided with a power storage module and a case. The power storage module is housed in the case. The power storage module includes a plurality of power storage cells. Each of the power storage cells expands due to repeated charging and discharging. The case is subjected to an external force caused by the expansion of the power storage cells.

[0004] For example, in order to suppress deformation of the case due to the external force received from the power storage cells, the fastening member described above is sometimes provided in the power storage module. However, the number of components of the power storage device increases due to this, which increases the assembly work load of the power storage device, and the weight of the power storage device becomes heavy. SUMMARY

[0005] The present disclosure was achieved in view of the above-described problems, and an object thereof is to provide a power storage device capable of reducing the number of components and restraining a plurality of power storage cells that are stacked in a stacking direction, and a vehicle that mounts the power storage device.

[0006] The power storage device of the present disclosure is provided with a power storage module, a housing case in which a housing space is formed, and a restraint member. The power storage module is housed in the housing 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 disposed apart from the first side wall by a space. The first side wall includes a first connection portion connected to the base member, and a first restraint portion apart from the first connection portion by a space in a vertical direction. The second side wall includes a second connection portion connected to the base member, and a second restraint portion apart from the second connection portion by a space in the vertical direction. The restraint member is formed to restrain the first restraint portion and the second restraint portion.

[0007] The power storage module can include a plurality of power storage cells arranged in a first direction. The plurality of power storage cells can each be formed to extend in a second direction that intersects the first direction, and the restraint member can be disposed at a position passing through the center of the power storage cells in the second direction.

[0008] The first side wall can be formed with an opening portion opening the accommodation space, and a path formed in the first side wall and communicating with the opening portion. The accommodation case can further include a partition wall. The accommodation space can have a first accommodation space and a second accommodation space. The partition wall can be configured to pass through the center of the first side wall and the second side wall in the second direction, and define the first accommodation space and the second accommodation space.

[0009] The accommodation case can further include a third side wall connected to the base member, a fourth side wall connected to the base member and configured to be spaced apart from the third side wall in the second direction, and a partition wall. The accommodation space can have a first accommodation space and a second accommodation space. The partition wall can be configured to pass through the center of the third side wall and the fourth side wall in the first direction, and define the first accommodation space and the second accommodation space.

[0010] The power storage module can include a plurality of power storage cells arranged in the first direction, the plurality of power storage cells each formed to extend in a second direction intersecting the first direction. The first side wall and the second side wall can be configured to be spaced apart in the first direction. The accommodation case can further include a third side wall connected to the base member, and a fourth side wall connected to the base member and configured to be spaced apart from the third side wall in the second direction. The plurality of power storage cells can each be configured to extend across the third side wall and the fourth side wall.

[0011] In addition, the vehicle of the present disclosure is provided with a vehicle body and the above-described power storage device mounted on the vehicle body. The first direction is the front-rear direction of the vehicle.

[0012] In addition, the vehicle of the present disclosure is provided with a vehicle body and the above-described power storage device mounted on the vehicle body. The first direction is the width direction of the vehicle.

[0013] The above and other objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which: BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a side view schematically showing a vehicle and a power storage device to which the present embodiment is applied.

[0015] Figure 2 is a perspective view schematically showing a vehicle frame of a vehicle.

[0016] Figure 3 is a sectional view showing a III-III section of Figure 2

[0017] Figure 4 is a perspective view schematically showing a power storage device.

[0018] Figure 5 is Figure 4 ​An exploded perspective view of the power storage device shown in FIG. 1.

[0019] Figure 6 is a sectional view of the VI-VI section of Figure 4

[0020] Figure 7 is a sectional view of the VII-VII section of Figure 4

[0021] Figure 8 is a sectional view of the VIII-VIII section of Figure 4

[0022] Figure 9 is a perspective view schematically showing a power storage device to which a partition wall is added to the power storage device shown in FIG. 1. Figure 4

[0023] Figure 10 is a schematic view of a power storage device in Modification 1 of the present embodiment.

[0024] Figure 11 is an exploded perspective view of the power storage device in Modification 1 of the present embodiment.

[0025] Figure 12 is a sectional view of the XI-XI section in Figure 10

[0026] Figure 13 is a schematic view of a power storage device in Modification 2 of the present embodiment.DETAILED DESCRIPTION

[0027] Embodiments of the present disclosure are described with reference to the accompanying drawings. In the drawings that are referred to below, the same or equivalent parts are designated with the same reference numerals.

[0028] Figure 1 is a side view schematically showing a vehicle and a power storage device to which the present embodiment is applied. Figure 1 The width direction W shown indicates the width direction of the vehicle. The stacking direction L indicates the stacking direction of the power storage cell described later. The up-down direction H indicates the up-down direction of the vehicle. In the present embodiment, the stacking direction L coincides with the front-rear direction of the vehicle, and is one example of the "first direction" of the present disclosure. In addition, the width direction W is one example of the "second direction" of the present disclosure.

[0029] The vehicle 1 is provided with a vehicle frame 2 and a power storage device 10. The vehicle 1 is, for example, an electric vehicle such as an electric automobile, a hybrid automobile, or the like that is capable of being driven by a motor. The vehicle 1 mounts the power storage device 10 in the lower portion of the vehicle.

[0030] Figure 2 ​​​​​is a perspective view schematically showing a vehicle skeleton of a vehicle. The vehicle skeleton 2 includes sidesills 3, a cross member 4, and side members 5.

[0031] The sidesills 3 are formed so as to extend in the stacking direction L. The sidesills 3 have a left sidesill 3a and a right sidesill 3b. The left sidesill 3a and the right sidesill 3b are disposed apart in the width direction W.

[0032] The cross member 4 is formed so as to extend in the width direction W. The cross member 4 is formed so as to link the left sidesill 3a and the right sidesill 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 disposed apart in the stacking direction L.

[0033] The side members 5 are formed so as to extend in the stacking direction L. The side members 5 have a left side member 5a and a right side member 5b.

[0034] Figure 3 A cross-sectional view of III-III in Figure 2 is shown. The left side member 5a is disposed in the vehicle inner side direction with respect to the left sidesill 3a in the width direction W. The right side member 5b is disposed in the vehicle inner side direction with respect to the right sidesill 3b in the width direction W.

[0035] The left side member 5a and the right side member 5b are each supported by the cross member 4. More specifically, the upper surfaces of the left side member 5a and the right side member 5b are each joined to the lower surface of the cross member 4. Through-holes 5c for screws for coupling the electrical storage device 10 are formed in the lower surfaces of the left side member 5a and the right side member 5b.

[0036] Figure 4 is a perspective view schematically showing an electrical storage device. Figure 5 is Figure 4 an exploded perspective view of the electrical storage device shown in

[0037] In Figure 5 , the electrical storage device 10 has a housing 100, an electrical storage module 200, a restraint member 300, and a cooling device 500.

[0038] The housing 100 forms a housing space R1 that houses the electrical storage module 200. The housing 100 has an upper cover 400, a base member 110, a peripheral wall 120, and a bottom plate 130.

[0039] The bottom plate 130 is formed so as to cover the opening portion of the base member 110.

[0040] The electrical storage module 200 is housed in the housing space R1 formed by the housing 100. The electrical storage module 200 is formed of a plurality of electrical storage cells 210.

[0041] Multiple battery cells 210 are stacked along the stacking direction L. The battery cells 210 are formed into a cubic shape that extends along the width direction W. One end of the battery cell 210 arranged along 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.

[0042] The battery cell 210 has an electrode body and an electrolyte housed inside. The electrode body of the battery cell 210 expands and contracts due to charging and discharging. Due to the expansion of the electrode body, the battery cell 210 expands in the stacking direction L. As a result, the battery module 200 expands in the stacking direction L due to the cumulative expansion of multiple battery cells 210. If an internal short circuit or other event occurs within the battery cell 210, high-temperature gas may be generated inside the battery cell 210 and discharged from the battery cell 210.

[0043] The cooling device 500 is configured to cover the lower surface of the energy storage module 200. The cooling device 500 and the energy storage module 200 are housed together in the housing 100.

[0044] The upper cover 400 is formed to cover the entire upper surface of the storage housing 100.

[0045] The base component 110 is formed in an annular shape. A connection region 110a is formed on the upper surface of the base component 110, which is opposite to the lower surface of the peripheral wall 120.

[0046] The base component 110 includes side frames 111 and 112, a front frame 113, and a rear frame 114.

[0047] Side frames 111 and 112 are respectively formed to extend along the stacking direction L. Side frames 111 and 112 are arranged with a gap in the width direction W.

[0048] The front frame 113 and the rear frame 114 are formed to extend along the width direction. The front frame 113 and the rear frame 114 are arranged with a gap in the stacking direction L.

[0049] The front frame 113 is configured to connect the front end of the side frame 111 to the front end of the side frame 112. The rear frame 114 is configured to connect the rear end of the side frame 111 to the rear end of the side frame 112.

[0050] Figure 6 yes Figure 4 A sectional view of section IV-IV. Figure 6 The top cover and the battery storage module are omitted in the design.

[0051] A first connecting region 111a and a second connecting region 111b are formed on the upper surface of the side frame 111. The first connecting region 111a is formed opposite to a connecting portion 120a, which is part of the lower surface of the peripheral wall 120. The second connecting region 111b is formed opposite to the lower surface of the left beam 5a. A through hole 110c extending in the vertical direction H is formed in the second connecting region 111b. The first connecting region 111a and the second connecting region 111b are arranged in the width direction W.

[0052] A first connecting region 112a and a second connecting region 112b are formed on the upper surface of the side frame 112. The first connecting region 112a is formed opposite to a connecting portion 120a, which is part of the lower surface of the peripheral wall 120. The second connecting region 112b is formed opposite to the lower surface of the right side beam 5b. A through hole 110c extending in the vertical direction H is formed in the second connecting region 112b. The first connecting region 112a and the second connecting region 112b are arranged in the width direction W.

[0053] The first connecting region 111a and the first connecting region 112a are part of the components constituting the connecting region 110a.

[0054] The energy storage device 10 is secured by bolts 11 and nuts 12 through the through hole 110c of the energy storage device 10 and the through hole 5c of the side beam 5.

[0055] A cooling device 500 is disposed on the upper surface of the base plate 130 and on the lower surface of the energy storage module 200 (not shown). A refrigerant path 500a is formed inside the cooling device 500. Refrigerant 501 flows in the refrigerant path 500a. Thus, the cooling device 500 can cool the energy storage module 200 from below.

[0056] The lower surface of the base plate 130, which is equipped with the cooling device 500, is located on the same plane as the lower surface of the base member 110.

[0057] Refer again Figure 5 The peripheral wall 120 is formed in an annular shape, rising upward from the connection region 110a of the base member 110. The peripheral wall 120 has a connecting portion 120a. The connecting portion 120a is formed integrally on the lower surface of the peripheral wall 120. The connecting portion 120a is formed opposite to the connection region 110a of the base member 110.

[0058] The peripheral wall 120 engages with the base component 110 at the connection region 110a and the connection portion 120a of the peripheral wall 120.

[0059] The peripheral wall 120 has a front wall 121, a rear wall 122, a side wall 123, and a side wall 124. The front wall 121 is an example of the "first side wall" of this disclosure, the rear wall 122 is an example of the "second side wall" of this disclosure, the side wall 123 is an example of the "third side wall" of this disclosure, and the side wall 124 is an example of the "fourth side wall" of this disclosure.

[0060] The front wall 121 and the rear wall 122 are formed to extend along the width direction W. The front wall 121 and the rear wall 122 are arranged with a gap in the stacking direction L.

[0061] The front wall 121 is configured to connect the front end of the side wall 123 to the front end of the side wall 124. The rear wall 122 is configured to connect the rear end of the side wall 123 to the rear end of the side wall 124.

[0062] Sidewalls 123 and 124 are formed to extend along the stacking direction L. Sidewalls 123 and 124 are arranged with a gap in the width direction W.

[0063] Figure 7 yes Figure 4 The sectional view along line VII-VII shown.

[0064] 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 part of the connecting portion 120a.

[0065] The front wall 121 also has a first constraint portion 121b. The first constraint portion 121b is the outer wall of the front wall 121, located at the center in the width direction W. The first constraint portion 121b is the portion located at the upper end of the front wall 121 and its surrounding area. The first constraint portion 121b is spaced apart from the first connecting portion 121a in the vertical direction H. A through hole 121c is formed in the first constraint portion 121b.

[0066] 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 part of the connecting portion 120a.

[0067] The rear wall 122 also has a second constraint portion 122b. The second constraint portion 122b is disposed on the outer wall of the rear wall 122. Furthermore, the second constraint portion 122b is the outer wall of the rear wall 122, located at the center in the width direction W. The second constraint portion 122b is the portion located at the upper end of the rear wall 122 and its surrounding area. The second constraint portion 122b is spaced apart from the second connecting portion 122a in the vertical direction H. A through hole 122c is formed in the second constraint portion 122b.

[0068] The constraint member 300 has a first constraint member 311, a second constraint member 312, and a connecting member 320.

[0069] The first constraint component 311 and the second constraint component 312 are arranged along the stacking direction L.

[0070] The first constraint member 311 is configured to pass through the upper end of the front wall 121 and cover the side of the front wall 121, and the first constraint member 311 is formed to cover the first constraint portion 121b.

[0071] The first constraint member 311 has a through hole 311a extending along the stacking direction L. The first constraint member 311 is constrained 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.

[0072] The second constraint member 312 is configured to pass through the upper end of the rear wall 122 and cover the side of the rear wall 122, and the second constraint member 312 is formed to cover the second constraint portion 122b.

[0073] The second constraint member 312 has a through hole 312a extending along the stacking direction L. The second constraint member 312 is constrained to the rear wall 122 by a bolt 331 and a nut 332 that pass through the through hole 312a and the through hole 122c.

[0074] The connecting member 320 is formed to extend along the stacking direction L. The connecting member 320 connects the first constraint member 311 and the second constraint member 312.

[0075] Figure 8 yes Figure 4 A sectional view of section VIII-VIII. Figure 8 The upper cover 400 and the energy storage module 200 are omitted. A path R2 is formed inside the front wall 121. An opening 121d is formed on the inner wall surface of the front wall 121, opening into the storage space R1. An opening 121e is formed on the outer wall surface of the front wall 121, opening outwards. Openings 121d and 121e are connected to the path R2.

[0076] In the above embodiment, in the energy storage device 10, the energy storage module 200 expands in the stacking direction L due to repeated charging and discharging, applying a load to the housing 100. Figure 5 In this configuration, constraint member 300 constrains the first constraint portion 121b of the front wall 121 and the second constraint portion 122b of the rear wall 122. The front wall 121 and the rear wall 122 are arranged with a gap in the stacking direction L. The front wall 121 engages with the front frame 113 at the first connection portion 121a. The rear wall 122 engages with the rear frame 114 at the second connection portion 122a.

[0077] By adopting such a structure, it is possible to provide an energy storage device 10 that suppresses the deformation of the peripheral wall 120 in the stacking direction L due to the expansion of the energy storage module 200, not only through the base component 110 but also through the constraint member 300.

[0078] Furthermore, in the energy storage device 10 according to this embodiment, the front wall 121 and rear wall 122 function as end plates of conventional energy storage devices, thus eliminating the need for conventional end plates. In addition, the constraint member 300 suppresses deformation of the front wall 121 and rear wall 122. In this way, it is possible to provide an energy storage device 10 that reduces the number of components and suppresses deformation of the housing 100 in the stacking direction L.

[0079] In the above embodiment, the first constraint portion 121b is located at the center of the front wall 121 in the width direction W. The second constraint portion 122b is located at the center of the rear wall 122 in the width direction W. Thus, the constraint member 300 is positioned at the center of the plurality of battery cells 210 in the width direction W.

[0080] By adopting such a structure, the constraint member 300 can constrain the location with the greatest change when the energy storage module 200 expands. As a result, the number of constraint members 300 can be reduced, and the number of components in the energy storage device 10 can be reduced.

[0081] In the above embodiment, the front wall 121 has: a path R2 formed inside the front wall 121, an opening 121d that opens into the storage space R1 where the energy 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.

[0082] By adopting such a structure, the energy storage device 10 can discharge the gas emitted from the energy storage module 200 to the outside of the energy storage device 10 via path R2.

[0083] Furthermore, the constraint member 300 includes a constraint band connecting the front wall 121 to the partition wall and a constraint band connecting the partition wall to the rear wall 122. Thus, the constraint member 300 can be formed by multiple constraint bands.

[0084] In such an energy storage device, the constraint member 300 can also suppress the deformation of the energy storage module 200, which will expand and deform in the stacking direction L.

[0085] In the above embodiment, an example is shown where the constraint member 300 passes through the center of the battery cell, but this disclosure is not limited to this. For example, in addition to the constraint member 300 passing through the center of the battery cell, multiple constraint members 300 may be provided. In addition, multiple constraint members 300 may be arranged at equal intervals in the width direction.

[0086] In the above embodiments, an example of fastening the energy storage device 10 to the side beam 5 is shown, but this disclosure is not limited thereto. For example, the energy storage device 10 can also be mounted on a vehicle by fastening it to the crossbeam 4.

[0087] In the above embodiment, the vehicle 1 is able to reduce the load applied to the side beam 5 from the energy storage device 10 by having an energy storage device 10 whose deformation is suppressed by the restraint member 300. As a result, deformation of the vehicle frame 2 can be suppressed.

[0088] In the above embodiments, an example of a storage housing 100 forming a storage space R1 is shown, but this disclosure is not limited thereto. For example, the storage housing 100 may also have a partition wall 170 that divides the storage space R1 into a first storage space R3 and a second storage space R4 arranged along the stacking direction L.

[0089] exist Figure 9 The diagram shows an example where the storage housing 100 of the energy storage device 10 in the above embodiment also has a partition wall 170. The partition wall 170 is formed to extend along the width direction W. One end of the end face of the partition wall 170 arranged along 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 170 is configured to pass through the center of the peripheral wall 120 in the stacking direction L. That is, the partition wall 170 is configured to pass through the center of the side wall 123 and the side wall 124. The partition wall 170 divides the storage space R1 formed by the storage housing 100 into a first storage space R3 and a second storage space R4.

[0090] <Variation Example 1>

[0091] In the above embodiment, an example is shown where the connecting region 110a is located on the upper surface of the base member 110 and the connecting portion 120a is located on the lower surface of the peripheral wall 120; however, this disclosure is not limited to this. For example, the connecting region 110a may be located on the inner peripheral wall of the base member 110, and the connecting portion 120a may be located on the outer peripheral wall of the peripheral wall 120. Details are shown below.

[0092] Figure 10 This is a schematic diagram of the energy storage device in Variation 1 of this embodiment. Figure 11 This is an exploded perspective view of the energy storage device in Variation 1 of this embodiment.

[0093] exist Figure 11 The diagram shows the housing 101 and the restraint member 300, while other components are omitted. Unless otherwise specified, the energy storage device 10a is the same as that described in the embodiments of this disclosure.

[0094] The housing 101 has a base component 140 and a peripheral wall 150.

[0095] The base component 140 is formed in a ring shape. The base component 140 has a side frame 141, a side frame 142, a front frame 143, and a rear frame 144.

[0096] Side frames 141 and 142 are respectively formed to extend along the stacking direction L. Side frames 141 and 142 are spaced apart in the width direction W.

[0097] The front frame 143 and the rear frame 144 are respectively formed to extend along the width direction W. The front frame 143 and the rear frame 144 are spaced apart in the stacking direction L.

[0098] The front frame 143 is configured to connect the front end of the side frame 141 to the front end of the side frame 142. The rear frame 144 is configured to connect the rear end of the side frame 141 to the rear end of the side frame 142.

[0099] The base component 140 has a first connection region 140a and a second connection region 140b.

[0100] 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.

[0101] The first connecting region 143a is formed on the entire inner wall surface of the front frame 143. The first connecting region 144a is formed on the entire inner wall surface of the rear frame 144.

[0102] The second connection region 140b is the upper surface of the side frame 141 and the side frame 142, formed in the region opposite to the lower surface of the side beam 5.

[0103] Figure 12 yes Figure 10 A sectional view of section XI-XI in [the image / image]. Figure 12 The battery storage module 200 and the upper cover 400 are omitted in the original text.

[0104] The peripheral wall 150 is formed in a ring-shaped extension. The peripheral wall 150 has a front wall 151 and a rear wall 152. The front wall 151 and the rear wall 152 are respectively formed to extend along the width direction W. The front wall 151 and the rear wall 152 are spaced apart in the stacking direction L.

[0105] The peripheral wall 150 also 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.

[0106] The front wall 151 has a first connecting portion 151a and a first restraining portion 151b.

[0107] The first connecting portion 151a is the outer wall of the front wall 151, and is formed in the region opposite to the first connecting region 143a.

[0108] The first constraint portion 151b is the outer wall of the front wall 151, located at the center in the width direction W. The first constraint portion 151b is the portion located at the upper end of the front wall 151 and its surrounding area. The first constraint portion 151b is spaced apart from the first connecting portion 151a in the vertical direction H. A through hole 151c is formed in the first constraint portion 151b.

[0109] The rear wall 152 has a second connecting portion 152a and a second restraining portion 152b.

[0110] The second connecting portion 152a is the outer wall of the rear wall 152, and is formed in the region opposite to the first connecting region 144a.

[0111] The second constraint portion 152b is the outer wall of the rear wall 152, located at the center in the width direction W. The second constraint portion 152b is the portion located at the upper end and around the front wall 151. The second constraint portion 152b is spaced apart from the second connecting portion 152a in the vertical direction H. A through hole 152c is formed in the second constraint portion 152b.

[0112] The first connecting portion 151a and the second connecting portion 152a constitute a part of the connecting portion 150a.

[0113] As described above, in the embodiment based on Modified Example 1, the peripheral wall 150 is joined to the base member 140 by connecting the first connecting region 140a to the connecting portion 150a.

[0114] <Variation Example 2>

[0115] In the above embodiments, an example is shown where the stacking direction L is aligned with the vehicle's longitudinal direction; however, this disclosure is not limited to this. For example, the stacking direction L may also be aligned with the width direction. Details are shown below.

[0116] Figure 13 This is a schematic diagram of the energy storage device in Variation 2 of this embodiment. Figure 13 The upper cover 400 is omitted in the text. Unless otherwise specified, the energy storage device 10b is the same as the energy storage device 10 in the embodiments of this disclosure.

[0117] Here, in Figure 13In this context, the forward / backward direction F represents the forward / backward direction of the vehicle, and the stacking direction L represents the stacking direction of the battery cells described later. In Modification 2, the stacking direction L is aligned with the width direction of the vehicle, which is an example of the "first direction" of this disclosure. Furthermore, the forward / backward direction F is an example of the "second direction" of this disclosure.

[0118] The energy storage device 10b includes a housing 102, energy storage modules 201 and 202, and restraints 301 and 302.

[0119] The housing 102 houses the battery storage module 201 and the battery storage module 202 in the first storage space R3 and the second storage space R4. The housing includes a base component 110, a peripheral wall 160, and a partition wall 170.

[0120] The peripheral wall 160 is formed in an annular shape, rising upward from the connection region 110a of the base member 110. The peripheral wall 160 has a connecting portion 160a. The connecting portion 160a is the lower surface of the peripheral wall 160, which is the surface opposite to the connection region 110a. The peripheral wall 160 engages with the base member 110 at the connection region 110a and the connecting portion 160a of the peripheral wall 160.

[0121] The peripheral wall 160 has a side wall 161, a side wall 162, a front wall 163, and a rear wall 164. In the modified example 2, the side wall 161 is an example of the "first side wall" of this disclosure, the side wall 162 is an example of the "second side wall" of this disclosure, the front wall 163 is an example of the "third side wall" of this disclosure, and the rear wall 164 is an example of the "fourth side wall" of this disclosure.

[0122] Sidewalls 161 and 162 are formed to extend in the front-rear direction F. Sidewalls 161 and 162 are spaced apart in the stacking direction L.

[0123] The front wall 163 and the rear wall 164 are formed to extend along the lamination direction L. The front wall 163 and the rear wall 164 are spaced apart in the lamination direction L.

[0124] The front wall 163 is configured to connect the front end of the side wall 161 to the front end of the side wall 162. The rear wall 164 is configured to connect the rear end of the side wall 161 to the rear end of the side wall 162.

[0125] The partition wall 170 is formed to extend along the stacking direction L. One end of the end face of the partition wall 170 arranged along the stacking direction L reaches the inner wall of the side wall 161, and the other end reaches the inner wall of the side wall 162. The partition wall 170 is configured to pass through the center of the peripheral wall 160 in the front-rear direction F. That is, the partition wall 170 is configured to pass through the center of the side walls 161 and 162. The partition wall 170 divides the storage space R1 formed by the storage housing 100 into a first storage space and a second storage space.

[0126] The partition wall 170 divides the storage housing 102 into a first storage space R3 and a second storage space R4.

[0127] The sidewall 161 has a first connecting portion 161a and a first restraining portion 161b, 161c.

[0128] The first connecting portion 161a is the lower surface of the sidewall 161. The first connecting portion 161a forms part of the connecting portion 160a.

[0129] The first constraint portion 161b is the outer wall of the sidewall 161, located at the center of the front wall 163 and the partition wall 170 in the front-rear direction F. The first constraint portion 161c is the outer wall of the sidewall 161, located at the center of the partition wall 170 and the rear wall 164 in the front-rear direction F. The first constraint portions 161b and 161c are spaced apart from the first connecting portion 161a in the vertical direction H. A through hole 161d is formed in the first constraint portions 161b and 161c.

[0130] The sidewall 162 has a first connecting portion 162a and a first restraining portion 162b, 162c.

[0131] The first connecting portion 162a is the lower surface of the sidewall 162. The first connecting portion 162a forms part of the connecting portion 160a.

[0132] The first constraint portion 162b is the outer wall of the side wall 162, located at the center of the front wall 163 and the partition wall 170 in the front-rear direction F. The first constraint portion 162c is the outer wall of the side wall 161, located at the center of the partition wall 170 and the rear wall 164 in the front-rear direction F. The first constraint portions 162b and 162c are spaced apart from the first connecting portion 162a in the vertical direction H. Through holes 162d are formed in the first constraint portions 162b and 162c.

[0133] The energy storage modules 201 and 202 are respectively housed in the first storage space R3 and the second storage space R4 formed in the housing 102. The energy storage modules 201 and 202 are formed by multiple energy storage cells 210.

[0134] Multiple battery cells 210 are stacked along the stacking direction L. The battery cells 210 are formed into a cubic shape that extends in the front-to-back direction F.

[0135] Constraints 301 and 302 are formed to extend along the stacking direction L. Constraint 301 is formed to extend from the first constraint portion 161b of sidewall 161 to the first constraint portion 162b of sidewall 162. In addition, constraint 302 is formed to cross the first constraint portion 161c of sidewall 161 and the first constraint portion 162c of sidewall 162.

[0136] In the modified example 2 described above, the constraint member 301 is configured to connect the first constraint portion 161b and the first constraint portion 162b. With this configuration, the constraint member 301 is positioned at the center of the battery cell 210 forming the energy storage module 201 in the longitudinal direction F. Similarly, the constraint member 302 is positioned at the center of the battery cell 210 forming the energy storage module 202 in the longitudinal direction F.

[0137] By adopting such a structure, the constraint members 301 and 302 can constrain the areas with the greatest changes when the energy storage modules 201 and 202 expand. As a result, the number of constraint members 301 and 302 can be reduced, and the number of components in the energy storage device 10 can be reduced.

[0138] In the modified example 2 described above, an example is shown where the partition wall 170 divides the housing 102 into a first storage space R3 and a second storage space R4, but this disclosure is not limited thereto. For example, the housing 102 may not have the partition wall 170. In this case, the housing 102 forms a storage space R1. The energy storage module 200 housed in the storage space R1 has energy storage cells 210 formed to be arranged along the stacking direction L and extending along the front-rear direction F. One end of the end face of the energy storage cell 210 arranged along 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.

[0139] The embodiments of this disclosure have been described above. However, all points in the embodiments disclosed herein should be considered as illustrative and not as limitations on this utility model. The technical scope represented by this utility model is indicated by the technical solution, and is intended to include equivalents to the technical solution and all modifications within its scope.

Claims

1. An energy storage device, wherein, The energy storage device includes an energy storage module, a storage shell with storage space, and a restraining component. The energy storage module is housed in the storage space. The storage housing includes a base component, a first sidewall connected to the base component, and a second sidewall connected to the base component and spaced apart from the first sidewall in a first direction. The first sidewall includes a first connecting portion connected to the base component, and a first constraint portion spaced vertically relative to the first connecting portion. The second sidewall includes a second connecting portion connected to the base component, and a second constraint portion spaced vertically relative to the second connecting portion. The constraint element is configured to constrain the first constraint portion and the second constraint portion.

2. The energy storage device according to claim 1, wherein, The energy storage module includes a plurality of energy storage cells arranged along the first direction. The plurality of battery cells are respectively formed to extend along a second direction that intersects the first direction. The constraint member is positioned in the second direction at the center of the plurality of battery cells.

3. The energy storage device according to claim 2, wherein, The first sidewall has an opening that opens into the storage space and a path formed within the first sidewall and communicating with the opening.

4. The energy storage device according to claim 3, wherein, The storage housing also includes partition walls. The storage space includes a first storage space and a second storage space. The partition wall is formed to extend along the first direction and is disposed between the center of the first sidewall in the second direction and the center of the second sidewall in the second direction, defining the first storage space and the second storage space.

5. The energy storage device according to claim 3, wherein, The storage housing also includes a third sidewall connected to the base component, a fourth sidewall connected to the base component and spaced apart from the third sidewall in the second direction, and a partition wall. The storage space includes a first storage space and a second storage space. The partition wall is formed to extend along the second direction and is disposed between the center of the third sidewall in the first direction and the center of the fourth sidewall in the first direction, defining the first storage space and the second storage space.

6. The energy storage device according to claim 1, wherein, The energy storage module includes a plurality of energy storage cells arranged along the first direction. The plurality of battery cells are respectively formed to extend along a second direction that intersects the first direction. The first sidewall and the second sidewall are arranged with a gap in the first direction. The storage housing also includes a third sidewall connected to the base component and a fourth sidewall connected to the base component and spaced apart from the third sidewall in a second direction. The plurality of battery cells are respectively distributed on the third sidewall and the fourth sidewall.

7. A vehicle, wherein, have: Vehicle body; and The energy storage device according to any one of claims 2, 3, 5, and 6 is mounted on the vehicle body. The first direction is the forward and backward direction of the vehicle.

8. A vehicle, wherein, have: Vehicle body; and The energy storage device according to any one of claims 2 to 4 and claim 6 is mounted on the vehicle body. The first direction is the width direction of the vehicle.

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