Electricity storage device

Abstract

The invention relates to a power storage device which can be mounted on a vehicle and is provided with a plurality of power storage units, a buffer part, and an upper plate part. The plurality of power storage cells are arranged in a first direction along a horizontal direction. The buffer portion is joined to an upper portion of each of the plurality of power storage cells. The buffer portion extends in the first direction. The upper plate portion is disposed above the buffer portion. The upper plate portion is joined to the buffer portion. The buffer portion is configured so as to be capable of being separated in the vertical direction when a tensile stress in the vertical direction is generated. The buffer portion has a starting point portion. The starting point portion serves as a starting point of separation of the buffer portion at an end edge in the first direction.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an electrical storage device. BACKGROUND

[0002] In Japanese Patent Application Publication No. 2020-142589, a battery pack is provided on the lower side of a floor panel. SUMMARY

[0003] A configuration of an electrical storage device capable of improving the energy density of the electrical storage device mounted on a vehicle is studied. For example, it is also studied that the electrical storage device disposed below a floor panel is as close as possible to the floor panel, and the electrical storage device itself constitutes a part of the floor panel. However, in the case where the electrical storage device is designed as described above, a load from the upper side, that is, from the inside of the vehicle cabin, can be input from above the electrical storage device due to the load. Also, if the electrical storage device is designed in a manner that has a configuration that improves the rigidity against the input of the load, it can be difficult to detach the electrical storage device from the upper side at the time of maintenance.

[0004] The present disclosure is made in view of the above-described points, and aims to provide an electrical storage device that is high in rigidity against the input of a load from above and easy to detach.

[0005] An electrical storage device according to an aspect of the present disclosure can be mounted on a vehicle. The electrical storage device includes a plurality of electrical storage units, a buffer portion, and an upper plate portion. The plurality of electrical storage units are arranged in a first direction along a horizontal direction. The buffer portion is joined to upper portions of the plurality of electrical storage units. The buffer portion extends in the first direction. The upper plate portion is disposed above the buffer portion. The upper plate portion is joined to the buffer portion. The buffer portion is configured to be separable in a vertical direction when a tensile stress in the vertical direction is generated. The buffer portion has a starting point portion. The starting point portion is a starting point of the separation of the buffer portion at an end edge in the first direction.

[0006] In the electrical storage device according to an aspect of the present disclosure, it is preferable that the buffer portion has an opening portion toward the first direction as the starting point portion.

[0007] In the electrical storage device according to an aspect of the present disclosure, it is preferable that the buffer portion has a plurality of gap portions arranged in the first direction.

[0008] In the electrical storage device according to an aspect of the present disclosure, it is preferable that the buffer portion has a cutout portion extending from the end edge toward the inside as the starting point portion.

[0009] In the electrical storage device according to the aspect of the present disclosure, it is preferable that the buffer portion include a lower-side buffer portion and an upper-side buffer portion. The lower-side buffer portion is located below the cutout portion. The upper-side buffer portion is located above the cutout portion. The upper-side buffer portion has an engaging portion. The engaging portion engages with the lower-side buffer portion in such a manner that the engagement with the lower-side buffer portion is released when the upper-side buffer portion is pulled upward.

[0010] In the electrical storage device according to the aspect of the present disclosure, it is preferable that the buffer portion include a plate-shaped main body portion and an adhesive material layer. The main body portion extends in the first direction. The adhesive material layer interjoins the main body portion and the upper plate portion with each other. The adhesive material layer includes a strong adhesive portion and a weak adhesive portion. The weak adhesive portion interjoins the main body portion and the upper plate portion with each other as a starting point portion with a joining strength weaker than that of the strong adhesive portion.

[0011] The above and other objects, features, aspects and advantages of the present application will become more apparent from the following detailed description of the present application taken in conjunction with the accompanying drawings, in which: BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a schematic view showing a vehicle on which the electrical storage device of Embodiment 1 of the present disclosure is mounted.

[0013] Figure 2 is a schematic perspective view showing a vehicle body of the vehicle on which the electrical storage device of Embodiment 1 of the present disclosure is mounted.

[0014] Figure 3 is a schematic cross-sectional view of a portion of the vehicle of Figure 1 from the direction of arrows of line III-III.

[0015] Figure 4 is a plan view showing the electrical storage device of Embodiment 1 of the present disclosure together with a cross member of the vehicle body.

[0016] Figure 5 is an exploded perspective view showing the electrical storage device of Embodiment 1 of the present disclosure.

[0017] Figure 6 is a cross-sectional view of the electrical storage device of Figure 4 from the direction of arrows of line VI-VI.

[0018] Figure 7 is a schematic cross-sectional view of an electrical storage module.

[0019] Figure 8 is a schematic cross-sectional view of the electrical storage device of Figure 4 from the direction of arrows of line VIII-VIII.

[0020] Figure 9is a partial cross-sectional view of the power storage device showing a state in which a tensile stress in the up-and-down direction is further generated in the buffer portion while the state of

[0021] Figure 10 is a partial cross-sectional view of the power storage device showing a state in which a tensile stress in the up-and-down direction is further generated in the buffer portion while the state of Figure 9

[0022] Figure 11 is a partial cross-sectional view of the power storage device of Embodiment 2 of the present disclosure.

[0023] Figure 12 is a partial cross-sectional view of the power storage device showing a state in which a tensile stress in the up-and-down direction is generated in the buffer portion while the state of

[0024] Figure 13 is a partial cross-sectional view of the power storage device of Embodiment 3 of the present disclosure.

[0025] Figure 14 is a partial cross-sectional view of the power storage device showing a state in which a tensile stress in the up-and-down direction is generated in the buffer portion while the state of

[0026] Figure 15 is a partial cross-sectional view of the power storage device showing a state in which a tensile stress in the up-and-down direction is further generated in the buffer portion while the state of Figure 14 DETAILED DESCRIPTION

[0027] Hereinafter, the power storage device of each embodiment of the present disclosure will be described with reference to the drawings. The same reference signs are attached to the same or equivalent portions in the drawings, and the description thereof will not be repeated.

[0028] (Embodiment 1)

[0029] Figure 1 is a schematic view of a vehicle on which the power storage device of Embodiment 1 of the present disclosure is mounted. As shown in Figure 1 , the power storage device 10 of Embodiment 1 of the present disclosure is a power storage device that can be mounted on a vehicle 1. First, the vehicle 1 will be described.

[0030] The vehicle 1 of Embodiment 1 is, for example, an electric vehicle such as an electric automobile, a hybrid automobile, or the like that can be driven by a motor. Figure 2 is a schematic perspective view of a vehicle body of the vehicle on which the power storage device of Embodiment 1 of the present disclosure is mounted. Figure 3 is a schematic cross-sectional view of a portion of the vehicle of Figure 1 when viewed from the arrow direction of the line III-III. As shown in Figures 1 to 3 ​​As shown, the vehicle 1 of Embodiment 1 of the present disclosure is provided with an electrical storage device 10 and a vehicle body 2 in which the electrical storage device 10 is fixed. The front-rear direction of the vehicle 1 or the vehicle body 2 is parallel to a first direction D1 described later in the electrical storage device 10.

[0031] The vehicle body 2 includes a plurality of cross members 3, a left rocker 4a, a right rocker 4b, a left side member 5a, and a right side member 5b as a skeletal member of the vehicle 1.

[0032] The plurality of cross members 3 each extend in a left-right direction of the vehicle body 2. The left-right direction or the vehicle width direction of the vehicle 1 or the vehicle body 2 is parallel to a second direction D2 described later in the electrical storage device 10. The plurality of cross members 3 are arranged in the first direction D1 with respect to each other. The vehicle body 2 can include only a single cross member 3.

[0033] The left rocker 4a is disposed on the left side in the left-right direction of the vehicle 1. The left rocker 4a extends in the front-rear direction of the vehicle 1. The right rocker 4b is disposed on the right side in the left-right direction of the vehicle 1. The right rocker 4b extends in the front-rear direction of the vehicle 1. The plurality of cross members 3 each extend from the inner side of the left rocker 4a to the inner side of the right rocker 4b.

[0034] The left side member 5a is disposed on the left side in the left-right direction of the vehicle 1. The left side member 5a extends in the front-rear direction of the vehicle. The left side member 5a is disposed closer to the vehicle center in the vehicle width direction than the left rocker 4a. The right side member 5b is disposed on the right side in the left-right direction of the vehicle 1. The right side member 5b is disposed closer to the vehicle center in the vehicle width direction than the right rocker 4b.

[0035] Next, the details of the electrical storage device 10 of Embodiment 1 of the present disclosure will be described. Figure 4 is a plan view showing the electrical storage device of Embodiment 1 of the present disclosure together with the cross members of the vehicle body.

[0036] As shown in Figure 3 and Figure 4 The electrical storage device 10 is provided with a plurality of electrical storage modules 50. The plurality of electrical storage modules 50 are disposed below the cross members 3.

[0037] The plurality of electrical storage modules 50 each extend in the first direction D1. The first direction D1 is a direction along the horizontal direction. When viewed from the up-down direction Z, the plurality of electrical storage modules 50 each are disposed in a manner crossing at least one cross member 3. When viewed from the up-down direction Z, the plurality of electrical storage modules 50 each are disposed in a manner crossing the plurality of cross members 3. The plurality of electrical storage modules 50 are arranged in a second direction D2. The second direction D2 is a direction along the horizontal direction. The second direction D2 is a direction orthogonal to the first direction D1. In the present embodiment, the plurality of electrical storage modules 50 are arranged only in the second direction D2.

[0038] Moreover, the power storage device 10 can have at least one power storage module 50. The power storage device 10 can have only one power storage module 50. In addition, a plurality of power storage modules 50 can be arranged in the first direction D1. A plurality of power storage modules 50 can be arranged in the first direction D1 and in the second direction D2. A plurality of power storage modules 50 can be arranged only in the first direction D1.

[0039] Next, the details of the power storage module 50 will be described. Figure 5 is an exploded perspective view of the power storage device of Embodiment 1 of the present disclosure. Figure 6 is a cross-sectional view of the power storage device of Figure 4 when viewed from the arrow direction of the line VI-VI. Figure 7 is a schematic cross-sectional view of the power storage module. In Figure 7 , the same cross-section as Figure 6 is illustrated. Figure 8 is a cross-sectional view of the power storage device of Figure 4 when viewed from the arrow direction of the line VIII-VIII.

[0040] As shown in Figures 5 to 8 , the plurality of power storage modules 50 each have a plurality of power storage cells 100 and a buffer portion 200.

[0041] The plurality of power storage cells 100 are each, for example, a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. The plurality of power storage cells 100 are arranged in the first direction D1 along the horizontal direction.

[0042] The plurality of power storage cells 100 each have an upper portion 101 facing upward. The plurality of power storage cells 100 each also have a first end face portion 102, a second end face portion 103, a bottom face portion 104, a first side face portion 105, and a second side face portion 106.

[0043] The first end face portion 102 extends from an end edge on one side in the first direction D1 of the upper portion 101 toward the lower side. The second end face portion 103 extends from an end edge on the other side in the first direction D1 of the upper portion 101 toward the lower side. The bottom face portion 104 is located on the side opposite the upper portion 101. The bottom face portion 104 is connected to the first end face portion 102 and the second end face portion 103.

[0044] The first side face portion 105 faces one side in the second direction D2. The second side face portion 106 faces the other side in the second direction D2. The first side face portion 105 and the second side face portion 106 are connected to the upper portion 101, the first end face portion 102, the second end face portion 103, and the bottom face portion 104.

[0045] The plurality of power storage units 100 each include an electrode body 110 and a power storage unit case 120. The electrode body 110 includes a positive electrode layer, a negative electrode layer, and a separator (none of which is shown). The separator is interposed between the positive electrode layer and the negative electrode layer. The positive electrode layer and the negative electrode layer can be stacked in the first direction D1 with the separator interposed therebetween. The positive electrode layer and the negative electrode layer can also be wound with the separator interposed therebetween with the second direction D2 as the axis direction.

[0046] The power storage unit case 120 houses the electrode body 110. The power storage unit case 120 can be composed of a metal such as aluminum or an aluminum alloy. The power storage unit case 120 forms at least a portion of each of the upper portion 101, the first end face portion 102, the second end face portion 103, and the bottom face portion 104. The power storage unit case 120 has a so-called square shape.

[0047] The buffer portion 200 extends in the first direction D1. The buffer portion 200 intersects the plurality of cross beams 3 when viewed from the up-down direction Z. The buffer portion 200 is joined to the respective upper portions 101 of the plurality of power storage units 100.

[0048] The buffer portion 200 has a starting point portion 201, an end edge 202, and a plurality of gap portions 203A. The starting point portion 201 will be described later. The end edge 202 is located at one end in the first direction D1 of the buffer portion 200. The plurality of gap portions 203A are arranged in the first direction D1. The plurality of gap portions 203A can be in communication with each other or can be independent of each other. The plurality of gap portions 203A can each extend in the second direction D2.

[0049] The buffer portion 200 includes a main body portion 210, a first adhesive material layer 220, and a second adhesive material layer 230. The main body portion 210 is provided so as to cover the plurality of power storage units 100. The main body portion 210 has a substantially plate-like outer shape. The main body portion 210 extends in the first direction D1. As the main body portion 210, a surface pressure dispersion plate or the like can be cited. In the present embodiment, the starting point portion 201, the end edge 202, and the plurality of gap portions 203A are formed in the main body portion 210. The material constituting the main body portion 210 will be described later.

[0050] A plurality of recessed strip portions 215 can be formed in the lower surface of the main body portion 210. The plurality of recessed strip portions 215 can be provided so as to face a portion of each of the upper portions 101 of the plurality of power storage units 100.

[0051] The first adhesive material layer 220 is provided on the upper surface of the main body portion 210. The second adhesive material layer 230 is provided on the lower surface of the main body portion 210. The buffer portion 200 is joined to the plurality of power storage units 100 by the second adhesive material layer 230. That is, the main body portion 210 and the plurality of power storage units 100 are adhered to each other via the second adhesive material layer 230.

[0052] The buffer portion 200 may further include a plurality of elastic members 240. The plurality of elastic members 240 may be formed, for example, of an insulating rubber member. The plurality of elastic members 240 are disposed within the plurality of recessed portions 215. The plurality of elastic members 240 are bonded to a portion of the upper portion 101 of the plurality of power storage cells 100 via the second adhesive layer 230.

[0053] The power storage device 10 further includes a package 300. The package 300 houses the plurality of power storage cells 100 and the buffer unit 200. In other words, the package 300 houses the plurality of power storage modules 50. The package 300 can be fixed to the vehicle body 2 of the vehicle 1. Specifically, the package 300 is configured as a frame member that can be fixed to the vehicle body 2 of the vehicle 1.

[0054] like Figure 3 As shown, in the vehicle 1 of this embodiment, the end portion of the package 300 on one side in the second direction D2 is fixed to the left side member 5a using a first fastening member 6a such as a bolt. The end portion of the package 300 on the other side in the second direction D2 is fixed to the right side member 5b using a second fastening member 6b such as a bolt.

[0055] Alternatively, one end portion of the package 300 in the second direction D2 may be fixed to the left door sill 4a, and the other end portion of the package 300 in the second direction D2 may be fixed to the right door sill 4b.

[0056] like Figure 3 as well as Figure 4 As shown, the package 300 is arranged below the plurality of cross members 3. The package 300 extends in the first direction D1. When viewed from the vertical direction Z, the package 300 is arranged to intersect the plurality of cross members 3. The package 300 also functions as a floor member defining the interior of the vehicle.

[0057] like Figure 5 as well as Figure 6 As shown, the package 300 includes an upper plate 310, a lower plate 320, and a peripheral wall 330. The upper plate 310 is positioned above the plurality of buffering portions 200. The upper plate 310 is bonded to the buffering portions 200. Specifically, the first adhesive layer 220 bonds the main body 210 and the upper plate 310 together.

[0058] The lower plate 320 is disposed below the power storage modules 50. The peripheral wall 330 extends downward from the outer peripheral end of the upper plate 310. The peripheral wall 330 extends horizontally to surround the plurality of power storage modules 50. The peripheral wall 330 is connected to the lower plate 320.

[0059] Here, the material constituting the main body portion 210 of the buffer portion 200 will be described. In the present embodiment, the main body portion 210 is made of a material having higher rigidity than the upper plate portion 310 .

[0060] The specific material comprising the main body 210 is not particularly limited. The main body 210 is preferably a resin member, for example. The resin member preferably has a higher heat resistance than the material comprising the upper plate 310. The resin member preferably has a lower thermal conductivity than the material comprising the upper plate 310. Using such a material for the resin member can suppress a temperature rise in the vehicle cabin when the power storage module 50 generates abnormal heat.

[0061] The resin member constituting the main body 210 may include a thermosetting resin, a glass fiber reinforced plastic, or a foamed resin. The foamed resin preferably has a heat-resistant temperature of 400° C. or higher.

[0062] The power storage device 10 may further include multiple restraining members 510 in each of the multiple power storage modules 50. The multiple restraining members 510 extend from one side of the power storage module 50 to the other side in the first direction D1. The multiple restraining members 510 apply a load to the multiple power storage cells 100 in the first direction D1. The multiple restraining members 510 fix the relative positions of the multiple power storage cells 100. The multiple restraining members 510 cover the four corners of each of the multiple power storage cells 100 when viewed from the first direction D1.

[0063] The power storage device 10 may further include a cooling plate 530. The cooling plate 530 is provided below the plurality of power storage modules 50. The cooling plate 530 may also be provided above the plurality of power storage modules 50. A circulation circuit (not shown) is formed inside the cooling plate 530 through which a refrigerant such as air or coolant can flow.

[0064] The power storage device 10 may further include a tray 540. The tray 540 is provided below the plurality of power storage modules 50. The power storage device 10 may further include a third adhesive layer 550 in each of the plurality of power storage modules 50. The third adhesive layer 550 is disposed between the plurality of power storage cells 100 and the tray 540. The third adhesive layer 550 bonds the plurality of power storage cells 100 to the tray 540.

[0065] In addition, if Figure 8 For ease of explanation, the plurality of storage cells 100 are shown separated from each other, but the plurality of storage cells 100 may be in close contact with each other in the first direction D1. Spacers or other members may be present between the plurality of storage cells 100.

[0066] Here, the starting point 201 of the buffer portion 200 in the first embodiment will be further described. Figure 9 This is a partial cross-sectional view of the power storage device showing a state in which vertical tensile stress is generated in the buffer portion in the first embodiment.Figure 10 is a partial cross-sectional view of the power storage device in a state in which the Figure 9 buffer portion further generates a tensile stress in the up-down direction when Figure 9 and Figure 10 the power storage device 10 is partially shown in the same cross-section as Figure 8 .

[0067] As shown in Figures 8 to 10 , the buffer portion 200 is configured to be able to separate in the up-down direction Z when a tensile stress in the up-down direction Z is generated. In the present embodiment, the separation is generated due to a break. In Figures 8 to 10 , specifically, a change in a state when the upper plate portion 310 is to be peeled from the plurality of power storage cells 100 is shown. In Figures 8 to 10 , more specifically, a change in a state when the upper plate portion 310 is pulled upward from the vicinity of the end edge 202 of the buffer portion 200 is shown.

[0068] The end edge 202 of the starting portion 201 in the first direction D1 becomes a starting point of the separation of the buffer portion 200. In the present embodiment, the buffer portion 200 has an opening portion 201A toward the first direction D1 as the starting portion 201. The opening portion 201A can extend in a second direction D2 orthogonal to the first direction D1. As shown in Figures 8 to 10 , due to the above-described pulling, a crack is generated from the opening portion 201A toward the inside of the buffer portion 200 along the first direction D1. Thereby, the main portion 210 of the buffer portion 200 separates in the up-down direction Z. As a result, the upper plate portion 310 is peeled from the plurality of power storage cells 100.

[0069] As described above, the power storage device 10 of Embodiment 1 of the present disclosure can be mounted on the vehicle 1. The power storage device 10 has the plurality of power storage cells 100, the buffer portion 200, and the upper plate portion 310. The plurality of power storage cells 100 are arranged in the first direction D1 along the horizontal direction. The buffer portion 200 is joined to the respective upper portions 101 of the plurality of power storage cells 100. The buffer portion 200 extends in the first direction D1. The upper plate portion 310 is disposed above the buffer portion 200. The upper plate portion 310 is joined to the buffer portion 200. The buffer portion 200 is configured to be able to separate in the up-down direction Z when a tensile stress in the up-down direction Z is generated. The buffer portion 200 has the starting portion 201. The starting portion 201 at the end edge 202 in the first direction D1 becomes a starting point of the separation of the buffer portion 200.

[0070] According to the above configuration, the input of the load from above the electric storage device 10 is dispersed in the first direction D1 at the buffer portion 200, and thus the rigidity of the electric storage device 10 against the input of the load from above can be improved. In addition, at the time of maintenance or the like, the worker lifts the end of the upper plate portion 310 upward, and thus separates the upper plate portion 310 from the plurality of electric storage units 100. At this time, the buffer portion 200 is separated in the up-down direction Z from the starting point of the starting point portion 201 (refer to Figures 9 to 11 ), and thus the upper plate portion 310 can be easily separated from the plurality of electric storage units 100. Therefore, according to the above configuration, the electric storage device 10 having high rigidity against the input of the load from above and being easily detachable can be provided.

[0071] In addition, in Embodiment 1, the buffer portion 200 has the opening portion 201A toward the first direction D1 as the starting point portion 201. According to this configuration, when the end of the upper plate portion 310 is lifted upward, a crack is easily generated in the first direction D1 from the opening portion 201A toward the inside of the buffer portion 200 (refer to Figures 9 to 11 ). Thus, the buffer portion 200 can be more easily separated in the up-down direction Z.

[0072] In addition, in Embodiment 1, the buffer portion 200 has a plurality of gap portions 203A arranged in the first direction D1. According to this configuration, when the end of the upper plate portion 310 is lifted upward, a crack is easily generated in the inside of the buffer portion 200 between the opening portion 201A and the gap portion 203A, and between the gap portions 203A (refer to Figures 9 to 11 ). Thus, the buffer portion 200 can be more easily separated in the up-down direction Z.

[0073] (Embodiment 2)

[0074] Next, the electric storage device of Embodiment 2 of the present disclosure will be described. The electric storage device of Embodiment 2 of the present disclosure is mainly different from the electric storage device 10 of Embodiment 1 of the present disclosure in the configuration of the buffer portion. In addition, the same configuration as the electric storage device 10 of Embodiment 1 of the present disclosure and the effects thereof will not be described.

[0075] Figure 11 is a partial cross-sectional view of the electric storage device of Embodiment 2 of the present disclosure. In Figure 11 and the following drawings, the cross-sectional view of the electric storage device is illustrated in the same cross-section as in Embodiment 1.

[0076] As Figure 11As shown, in the power storage device 10B of Embodiment 2 of the present disclosure, the buffer portion 200 has a cutout portion 201B. The cutout portion 201B extends from the end edge 202 toward the inside. The cutout portion 201B extends throughout the entirety of the buffer portion 200 in the first direction D1.

[0077] The buffer portion 200 includes a lower side buffer portion 204B and an upper side buffer portion 206B. The lower side buffer portion 204B is located below the cutout portion 201B. The lower side buffer portion 204B has a plurality of engaged portions 205B. The plurality of engaged portions 205B are respectively provided in the lower side buffer portion 204B in a manner of being recessed toward either of the first direction D1. The plurality of engaged portions 205B can also be respectively provided in the lower side buffer portion 204B in a manner of being protruded toward either of the first direction D1.

[0078] The upper side buffer portion 206B is located above the cutout portion 201B. The upper side buffer portion 206B has engaged portions 207B. The plurality of engaged portions 207B are engaged with the lower side buffer portion 204B. Specifically, the plurality of engaged portions 207B are respectively provided in the upper side buffer portion 206B in a manner of being protruded toward either of the first direction D1. In a case where the plurality of engaged portions 205B are provided in a manner of being protruded, the plurality of engaged portions 207B can be provided in the upper side buffer portion 206B in a manner of being recessed toward either of the first direction D1.

[0079] Further, in the present embodiment, the main portion 210 includes a lower side main portion 211B and an upper side main portion 212B. The lower side main portion 211B is a portion on a lower side than the cutout portion 201B. The upper side main portion 212B is a portion on an upper side than the cutout portion 201B. In the present embodiment, the lower side buffer portion 204B includes the lower side main portion 211B and the second adhesive material layer 230. The upper side buffer portion 206B includes the upper side main portion 212B and the first adhesive material layer 220.

[0080] Here, the start portion 201 of the buffer portion 200 in Embodiment 2 is described. Figure 12 is a partial cross-sectional view of the power storage device showing a state when a tensile stress in the up-down direction is generated in the buffer portion in Embodiment 2. As shown in Figure 11 and Figure 12 As shown, in Embodiment 2, the buffer portion 200 is also configured to be able to separate in the up-down direction Z when a tensile stress in the up-down direction Z is generated. In Figure 11 and Figure 12 Specifically, a change in a state when the upper plate portion 310 is to be peeled from the plurality of power storage units 100 is shown in Figure 11 and Figure 12 More specifically, a change in a state when the upper plate portion 310 is pulled upward from the vicinity of the end edge 202 of the buffer portion 200 is shown in

[0081] In the second embodiment, the cutout portion 201B functions as the starting point 201. Figure 11 as well as Figure 12 As shown, due to the aforementioned pulling, the upper buffer portion 206B is pulled upward near the end edge 202. Furthermore, as the upper buffer portion 206B is pulled upward, the engagement between the multiple engaging portions 207B and the lower buffer portion 204B is disengaged. Specifically, the engagement between the multiple engaging portions 207B and the multiple engaged portions 205B is disengaged. As a result, the main body 210 of the buffer portion 200 separates in the vertical direction Z. As a result, the upper plate portion 310 is peeled off from the multiple storage cells 100.

[0082] Furthermore, in this embodiment, the main body 210 of the buffer portion 200 is separable in the vertical direction Z without being destroyed. Therefore, the power storage device 10B of the second embodiment can also easily assemble the lower buffer portion 204B and the upper buffer portion 206B when the power storage device 10B is manufactured.

[0083] As described above, in the power storage device 10B according to the second embodiment of the present disclosure, the buffer portion 200 includes the cutout portion 201B extending from the end edge 202 toward the inside as the starting point 201 .

[0084] According to the above configuration, when the end of the upper plate portion 310 is lifted upward, the buffer portion 200 can be easily separated in the up-down direction Z along the cutout portion 201B.

[0085] In Embodiment 2, the buffer portion 200 includes a lower buffer portion 204B and an upper buffer portion 206B. The lower buffer portion 204B is located below the cutout. The upper buffer portion 206B is located above the cutout. The upper buffer portion 206B has an engaging portion 207B. The engaging portion 207B engages with the lower buffer portion 204B so that the engagement with the lower buffer portion 204B is released when the upper buffer portion 206B is pulled upward.

[0086] According to the above configuration, during normal use other than maintenance, the engagement portion 207B is engaged with the lower buffer portion 204B, thereby preventing the upper buffer portion 206B and the lower buffer portion 204B from being separated.

[0087] (Implementation 3)

[0088] Next, the power storage device according to the third embodiment of the present disclosure will be described. The power storage device according to the third embodiment of the present disclosure differs from the power storage device 10 according to the first embodiment of the present disclosure primarily in the configuration of the buffer unit. Configurations and effects similar to those of the power storage device 10 according to the first embodiment of the present disclosure will not be described repeatedly.

[0089] Figure 13 is a partial cross-sectional view of the power storage device of Embodiment 3 of the present disclosure. As Figure 13 indicated, in the power storage device 10C of Embodiment 3 of the present disclosure, the first adhesive material layer 220 includes the strong adhesive portions 221C and the weak adhesive portions 222C. The weak adhesive portions 222C interpose the main body portion 210 and the upper plate portion 310 with a weaker bonding strength than the strong adhesive portions 221C as the starting point portions 201.

[0090] Figure 14 is a partial cross-sectional view of the power storage device showing a state when a tensile stress in the up-down direction is further generated at the buffer portion in Embodiment 3. Figure 15 is a partial cross-sectional view of the power storage device showing a state when Figure 14 the weak adhesive portions 222C are further deformed.

[0091] As Figures 13 to 15 indicated, according to the above-described configuration, when the end of the upper plate portion 310 is lifted upward, the first adhesive material layer 220 and the main body portion 210 can be easily separated in the up-down direction Z with the release of the bonding of the weak adhesive portions 222C to the main body portion 210 as a starting point. In addition, in ordinary use other than maintenance, the release of the bonding of the first adhesive material layer 220 to the main body portion 210 can be suppressed by the strong adhesive portions 221C.

[0092] Furthermore, in the present embodiment, the first adhesive material layer 220 includes a plurality of strong adhesive portions 221C and a plurality of weak adhesive portions 222C, the plurality of weak adhesive portions 222C including the weak adhesive portions 222C as the above-described starting point portions 201. The plurality of strong adhesive portions 221C and the weak adhesive portions 222C are alternately arranged in the first direction D1.

[0093] According to the above-described configuration, the balance between the ease of separation of the first adhesive material layer 220 from the main body portion 210 and the bonding force of the first adhesive material layer 220 to the main body portion 210 can be achieved.

[0094] In the description of the above-described embodiments, configurations that can be combined can be combined with each other.

[0095] Embodiments of the present application have been described, but it should be considered that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present application is indicated by the claims, and it is intended to include meanings and ranges equivalent to the claims and all modifications within the scope.

Claims

1. An electric storage device capable of being mounted on a vehicle, the electric storage device comprising: a plurality of electric storage units arranged in a first direction along a horizontal direction; a buffer portion joined to upper portions of the plurality of electric storage units and extending in the first direction; and an upper plate portion disposed above the buffer portion and joined to the buffer portion, the buffer portion configured to be separable in a vertical direction when a tensile stress in the vertical direction is generated, an end edge of the buffer portion in the first direction having a starting point portion that is a starting point of separation of the buffer portion.

2. The electric storage device according to claim 1, the buffer portion having an opening portion toward the first direction as the starting point portion.

3. The electric storage device according to claim 2, the buffer portion having a plurality of gap portions arranged in the first direction.

4. The electric storage device according to claim 1, the buffer portion having a cutout portion extending from the end edge toward an inside as the starting point portion.

5. The electric storage device according to claim 4, the buffer portion including a lower buffer portion below the cutout portion and an upper buffer portion above the cutout portion, the upper buffer portion having an engagement portion that engages with the lower buffer portion in such a manner that engagement with the lower buffer portion is released when the upper buffer portion is pulled upward.

6. The electric storage device according to claim 1, the buffer portion including: a plate-shaped main body portion extending in the first direction; and a layer of adhesive material joining the main body portion and the upper plate portion to each other, the layer of adhesive material including a strong adhesive portion and a weak adhesive portion that joins the main body portion and the upper plate portion to each other with a weaker joining strength than the strong adhesive portion as the starting point portion. ​

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