Electricity storage device

Abstract

The utility model relates to an electrical storage device which can be carried on a vehicle and is provided with a plurality of electrical 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] This disclosure relates to energy storage devices. Background Technology

[0002] Japanese Patent Application Publication No. 2020-142589 discloses a battery pack located on the lower side of the floor panel. Utility Model Content

[0003] The structure of an energy storage device capable of increasing the energy density of an energy storage device mounted in a vehicle was studied. For example, a design was also investigated in which the energy storage device is positioned as close as possible to the floor panel below it, thus becoming part of the floor panel itself. However, when the energy storage device is designed as described above, loads from the inside of the vehicle interior, i.e., from above, may be input from above the energy storage device. Furthermore, if the energy storage device is designed with a structure that increases rigidity to handle such load inputs, it may be difficult to remove the energy storage device from above during maintenance.

[0004] This disclosure is made in view of the aforementioned problems, and its purpose is to provide an energy storage device that is highly rigid and easy to disassemble in response to input loads from above.

[0005] The energy storage device according to a certain aspect of this disclosure can be mounted on a vehicle. The energy storage device includes multiple energy storage units, a buffer section, and an upper plate section. The multiple energy storage units are arranged in a first direction along the horizontal direction. The buffer section is engaged with the upper part of each of the multiple energy storage units. The buffer section extends in the first direction. The upper plate section is disposed above the buffer section. The upper plate section is engaged with the buffer section. The buffer section is configured to separate in a vertical direction when tensile stress is generated in the vertical direction. The buffer section has a starting point. The starting point is located at its end edge in the first direction, serving as the starting point for separation of the buffer section.

[0006] In a certain aspect of the energy storage device according to this disclosure, it is preferred that the buffer portion has an opening facing the first direction as a starting point.

[0007] In an energy storage device according to a certain aspect of the present disclosure, it is preferred that the buffer portion has a plurality of gaps arranged in a first direction.

[0008] In a certain aspect of the energy storage device according to this disclosure, it is preferred that the buffer portion has a cutout extending from the end edge toward the interior as a starting point.

[0009] In a certain aspect of the energy storage device according to this disclosure, it is preferred that the buffer portion includes a lower buffer portion and an upper buffer portion. The lower buffer portion is located below the cutout portion. The upper buffer portion is located above the cutout portion. The upper buffer portion has an engaging portion. The engaging portion engages with the lower buffer portion in such a way that the engagement with the lower buffer portion is released when the upper buffer portion is pulled upward.

[0010] In a certain aspect of the energy storage device according to this disclosure, it is preferred that the buffer portion includes a plate-shaped main body and an adhesive material layer. The main body extends in a first direction. The adhesive material layer bonds the main body to the upper plate portion. The adhesive material layer includes a strong adhesive portion and a weak adhesive portion. The weak adhesive portion serves as a starting point and bonds the main body to the upper plate portion with a weaker bonding strength than the strong adhesive portion.

[0011] The above and other objects, features, aspects and advantages of this invention will become apparent from the following detailed description of the invention, which is understood in conjunction with the accompanying drawings. Attached Figure Description

[0012] Figure 1 This is a schematic diagram showing a vehicle equipped with an energy storage device according to Embodiment 1 of the present disclosure.

[0013] Figure 2 This is a schematic perspective view showing the body of a vehicle equipped with the energy storage device of Embodiment 1 of the present disclosure.

[0014] Figure 3 It is Figure 1 A schematic cross-sectional view of a portion of the vehicle as viewed from the direction of the arrow along line III-III.

[0015] Figure 4 This is a top view showing the energy storage device of Embodiment 1 of this disclosure together with the crossbeam of the vehicle body.

[0016] Figure 5 This is an exploded perspective view showing the energy storage device according to Embodiment 1 of this disclosure.

[0017] Figure 6 It is Figure 4 A cross-sectional view of the energy storage device as viewed from the direction of the arrow along line VI-VI.

[0018] Figure 7 This is a schematic cross-sectional view of the energy storage module.

[0019] Figure 8 It is Figure 4 A schematic cross-sectional view of the energy storage device as viewed from the direction of the arrow along line VIII-VIII.

[0020] Figure 9This is a partial cross-sectional view of the energy storage device showing the state when tensile stress in the buffer section is generated in the vertical direction in Embodiment 1.

[0021] Figure 10 It shows the continuation Figure 9 A partial cross-sectional view of the energy storage device in a state where tensile stress in the vertical direction is further generated in the buffer section.

[0022] Figure 11 This is a partial cross-sectional view of the energy storage device according to Embodiment 2 of this disclosure.

[0023] Figure 12 This is a partial cross-sectional view of the energy storage device showing the state when tensile stress in the buffer section is generated in the vertical direction in Embodiment 2.

[0024] Figure 13 This is a partial cross-sectional view of the energy storage device according to Embodiment 3 of this disclosure.

[0025] Figure 14 This is a partial cross-sectional view of the energy storage device showing the state when tensile stress in the buffer section is generated in the vertical direction in Embodiment 3.

[0026] Figure 15 It shows the continuation Figure 14 A partial cross-sectional view of the energy storage device in a state where tensile stress in the vertical direction is further generated in the buffer section. Detailed Implementation

[0027] Hereinafter, the energy storage devices of various embodiments of the present disclosure will be described with reference to the accompanying drawings. The same or equivalent parts in the drawings will be labeled with the same reference numerals, and their descriptions will not be repeated.

[0028] (Implementation Method 1)

[0029] Figure 1 This is a schematic diagram showing a vehicle equipped with the energy storage device according to Embodiment 1 of this disclosure. Figure 1 As shown, the energy storage device 10 of Embodiment 1 of this disclosure is an energy storage device that can be mounted on a vehicle 1. First, the vehicle 1 will be described.

[0030] The vehicle 1 in Embodiment 1 is, for example, an electric vehicle such as an electric car or a hybrid vehicle that can be driven by a motor. Figure 2 This is a schematic perspective view showing the body of a vehicle equipped with the energy storage device of Embodiment 1 of the present disclosure. Figure 3 It is Figure 1 A schematic cross-sectional view of a portion of the vehicle as viewed from the direction of the arrow along line III-III. (See image.) Figures 1-3As shown, the vehicle 1 of Embodiment 1 of this disclosure includes an energy storage device 10 and a vehicle body 2 on which the energy storage device 10 is fixed. The longitudinal direction of the vehicle 1 or the vehicle body 2 is parallel to the first direction D1 described later in the energy storage device 10.

[0031] The vehicle body 2 includes multiple crossbeams 3, a left sill 4a, a right sill 4b, a left longitudinal beam 5a, and a right longitudinal beam 5b as the skeleton components of the vehicle 1.

[0032] Multiple crossbeams 3 extend in the left-right direction of the vehicle body 2. The left-right direction or width direction of the vehicle 1 or vehicle body 2 is parallel to the second direction D2 described later in the energy storage device 10. The multiple crossbeams 3 are arranged relative to each other in the first direction D1. The vehicle body 2 may include only a single crossbeam 3.

[0033] The left sill 4a is located on the left side of the vehicle 1 in the left-right direction. The left sill 4a extends in the front-rear direction of the vehicle 1. The right sill 4b is located on the right side of the vehicle 1 in the left-right direction. The right sill 4b extends in the front-rear direction of the vehicle 1. Multiple crossbeams 3 each extend from the inside of the left sill 4a to the inside of the right sill 4b.

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

[0035] Next, the details of the energy storage device 10 according to Embodiment 1 of this disclosure will be described. Figure 4 This is a top view showing the energy storage device of Embodiment 1 of this disclosure together with the crossbeam of the vehicle body.

[0036] like Figure 3 as well as Figure 4 As shown, the energy storage device 10 includes multiple energy storage modules 50. The multiple energy storage modules 50 are arranged below the crossbeam 3.

[0037] Multiple energy storage modules 50 each extend in a first direction D1. The first direction D1 is a horizontal direction. When viewed from the vertical direction Z, each of the multiple energy storage modules 50 is arranged to intersect at least one crossbeam 3. When viewed from the vertical direction Z, each of the multiple energy storage modules 50 is arranged to intersect multiple crossbeams 3. The multiple energy storage modules 50 are arranged in a second direction D2. The second direction D2 is a horizontal direction. The second direction D2 is orthogonal to the first direction D1. In this embodiment, the multiple energy storage modules 50 are arranged only in the second direction D2.

[0038] Furthermore, the energy storage device 10 may have at least one energy storage module 50. Alternatively, the energy storage device 10 may have only one energy storage module 50. Multiple energy storage modules 50 may also be arranged in the first direction D1. Multiple energy storage modules 50 may also be arranged in both the first direction D1 and the second direction D2. Multiple energy storage modules 50 may also be arranged only in the first direction D1.

[0039] Next, the details of the energy storage module 50 will be explained. Figure 5 This is an exploded perspective view showing the energy storage device according to Embodiment 1 of this disclosure. Figure 6 It is Figure 4 A cross-sectional view of the energy storage device as viewed from the direction of the arrow along line VI-VI. Figure 7 This is a schematic cross-sectional view of the energy storage module. Figure 7 In, with Figure 6 The same sectional view is illustrated. Figure 8 It is Figure 4 A schematic cross-sectional view of the energy storage device as viewed from the direction of the arrow along line VIII-VIII.

[0040] like Figures 5-8 As shown, each of the multiple energy storage modules 50 has multiple energy storage units 100 and a buffer section 200.

[0041] Each of the multiple energy storage units 100 is, for example, a non-aqueous electrolyte secondary battery such as a lithium-ion secondary battery. The multiple energy storage units 100 are arranged in a first direction D1 along the horizontal direction.

[0042] Each of the plurality of energy storage units 100 has an upper portion 101 facing upward. Each of the plurality of energy storage units 100 also has a first end portion 102, a second end portion 103, a bottom portion 104, a first side portion 105, and a second side portion 106.

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

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

[0045] Each of the multiple energy storage units 100 includes an electrode body 110 and an energy storage unit housing 120. The electrode body 110 includes a positive electrode layer, a negative electrode layer, and a separator (not shown). The separator is located 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 in between. The positive electrode layer and the negative electrode layer can also be wound in the second direction D2 with the separator in between.

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

[0047] The buffer section 200 extends in the first direction D1. When viewed from the vertical direction Z, the buffer section 200 intersects with multiple crossbeams 3. The buffer section 200 engages with the upper part 101 of each of the multiple energy storage units 100.

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

[0049] The buffer section 200 includes a main body 210, a first adhesive material layer 220, and a second adhesive material layer 230. The main body 210 is provided to cover a plurality of energy storage cells 100. The main body 210 has a generally plate-like shape. The main body 210 extends in a first direction D1. Examples of the main body 210 include a surface pressure dispersion plate. In this embodiment, a starting point 201, an end edge 202, and a plurality of gaps 203A are formed in the main body 210. The materials constituting the main body 210 will be described later.

[0050] Multiple recessed sections 215 may be formed on the lower surface of the main body 210. The multiple recessed sections 215 may be arranged in a manner that faces each of the upper parts 101 of the multiple energy storage units 100.

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

[0052] The buffer portion 200 may also include a plurality of elastic members 240. The plurality of elastic members 240 are made of, for example, insulating rubber members. The plurality of elastic members 240 are respectively disposed in a plurality of recessed portions 215. The plurality of elastic members 240 are respectively bonded to a portion of the upper portion 101 of the plurality of energy storage units 100 via a second adhesive material layer 230.

[0053] The energy storage device 10 also includes a package 300. The package 300 houses multiple energy storage units 100 and a buffer section 200. That is, the package 300 houses multiple energy storage modules 50. The package 300 can be fixed to the body 2 of the vehicle 1. Specifically, the package 300 is configured as a skeletal component that can be fixed to the body 2 of the vehicle 1.

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

[0055] Furthermore, one end of the package 300 in the second direction D2 can also be fixed to the left threshold 4a. The other end of the package 300 in the second direction D2 can also be fixed to the right threshold 4b.

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

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

[0058] The lower plate portion 320 is disposed below the energy storage module 50. The peripheral wall portion 330 extends downward from the outer peripheral end of the upper plate portion 310. The peripheral wall portion 330 extends horizontally in a manner that surrounds the plurality of energy storage modules 50. The peripheral wall portion 330 is connected to the lower plate portion 320.

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

[0060] The specific material constituting the main body 210 is not particularly limited. The main body 210 is preferably, for example, a resin component. This resin component preferably has a higher heat resistance temperature than the material constituting the upper plate 310. This resin component preferably has a lower thermal conductivity than the material constituting the upper plate 310. By making the resin component such a material, the temperature rise inside the vehicle can be suppressed when the energy storage module 50 abnormally heats up.

[0061] The resin component constituting the main body 210 may comprise a thermosetting resin. This resin component may be made of glass fiber reinforced plastic. This resin component may comprise a foamed resin. Preferably, the foamed resin has a heat resistance temperature of 400°C or higher.

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

[0063] The energy storage device 10 may also include a cooling plate 530. The cooling plate 530 is disposed below the plurality of energy storage modules 50. The cooling plate 530 may also be disposed above the plurality of energy storage modules 50. Inside the cooling plate 530, a flow circuit (not shown) is formed for the flow of refrigerant such as air and coolant.

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

[0065] In addition, such as Figure 8 As shown, for ease of explanation, the multiple energy storage units 100 are illustrated as being isolated from each other, but the multiple energy storage units 100 may also be closely connected to each other in the first direction D1. Other components such as spacers may also exist between the multiple energy storage units 100.

[0066] Here, the starting point 201 of the buffer section 200 in Embodiment 1 will be further described. Figure 9 This is a partial cross-sectional view of the energy storage device showing the state when tensile stress in the buffer section is generated in the vertical direction in Embodiment 1. Figure 10 It shows the continuation Figure 9 A partial cross-sectional view of the energy storage device in a state where tensile stress in the vertical direction is further generated in the buffer section. Figure 9 as well as Figure 10 In, with Figure 8 The same cross-section is used to partially show the energy storage device 10.

[0067] like Figures 8-10 As shown, the buffer portion 200 is configured to separate in the vertical direction Z when a tensile stress in the vertical direction Z is generated. In this embodiment, this separation occurs due to damage. Figures 8-10 Specifically, the diagram illustrates the change in state when the upper plate 310 is to be detached from the plurality of energy storage units 100. Figures 8-10 More specifically, the diagram shows the change in the state of the upper plate portion 310 when it is pulled upward from near the end edge 202 of the buffer portion 200.

[0068] The starting point 201 serves as the starting point for the separation of the buffer portion 200 at its end edge 202 in the first direction D1. In this embodiment, the buffer portion 200 has an opening 201A facing the first direction D1 as the starting point 201. The opening 201A can extend in a second direction D2 orthogonal to the first direction D1. Figures 8-10 As shown, due to the aforementioned pulling, cracks occur from the opening 201A toward the interior of the buffer section 200 along the first direction D1. Consequently, the main body 210 of the buffer section 200 separates in the vertical direction Z. As a result, the upper plate 310 is peeled off from the plurality of energy storage units 100.

[0069] As described above, the energy storage device 10 of Embodiment 1 of this disclosure can be mounted on a vehicle 1. The energy storage device 10 includes a plurality of energy storage units 100, a buffer section 200, and an upper plate section 310. The plurality of energy storage units 100 are arranged in a first direction D1 along the horizontal direction. The buffer section 200 is engaged with the upper portion 101 of each of the plurality of energy storage units 100. The buffer section 200 extends in the first direction D1. The upper plate section 310 is disposed above the buffer section 200. The upper plate section 310 is engaged with the buffer section 200. The buffer section 200 is configured to be able to separate in the vertical direction Z when a tensile stress in the vertical direction Z is generated. The buffer section 200 has a starting point portion 201. The starting point portion 201 becomes the starting point of the separation of the buffer section 200 at its end edge 202 in the first direction D1.

[0070] According to the above configuration, the input of load from above the energy storage device 10 can be dispersed in the first direction D1 at the buffer section 200, thus improving the rigidity of the energy storage device 10 against the input of load from above. Furthermore, during maintenance, the operator separates the upper plate section 310 from the multiple energy storage units 100 by lifting the end of the upper plate section 310 upwards. At this time, the buffer section 200 separates in the vertical direction Z starting from the aforementioned starting point section 201 (see reference). Figures 9-11 Therefore, the upper plate portion 310 can be easily separated from the multiple energy storage units 100. Thus, according to the above configuration, an energy storage device 10 with high rigidity and easy disassembly can be provided to withstand input loads from above.

[0071] Furthermore, in Embodiment 1, the buffer portion 200 has an opening 201A facing the first direction D1 as a starting point 201. According to this configuration, when the end of the upper plate portion 310 is lifted upwards, cracks easily form from the opening 201A towards the interior of the buffer portion 200 along the first direction D1 (see reference). Figures 9-11 This makes it easier for the buffer section 200 to separate in the vertical Z direction.

[0072] Furthermore, in Embodiment 1, the buffer portion 200 has a plurality of gaps 203A arranged in the first direction D1. According to this configuration, when the end of the upper plate portion 310 is lifted upwards, cracks easily occur inside the buffer portion 200 between the opening 201A and the gaps 203A, and between the gaps 203A themselves (see reference). Figures 9-11 This allows the buffer section 200 to be separated more easily in the vertical Z direction.

[0073] (Implementation Method 2)

[0074] Next, the energy storage device according to Embodiment 2 of this disclosure will be described. The main difference between the energy storage device of Embodiment 2 and the energy storage device 10 of Embodiment 1 is the configuration of the buffer section. Furthermore, the same configuration and effects as those of the energy storage device 10 of Embodiment 1 will not be described again.

[0075] Figure 11 This is a partial cross-sectional view of the energy storage device according to Embodiment 2 of this disclosure. Figure 11 In the following figures, the cross-sectional view of the energy storage device is illustrated with the same cross-sectional view as in Embodiment 1.

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

[0077] 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 portion 201B. The lower buffer portion 204B has a plurality of engaging portions 205B. The plurality of engaging portions 205B are respectively provided in the lower buffer portion 204B in such a way that they are recessed in any one of the first directions D1. The plurality of engaging portions 205B may also be provided in the lower buffer portion 204B in such a way that they protrude in any one of the first directions D1.

[0078] The upper buffer portion 206B is located above the cutout portion 201B. The upper buffer portion 206B has an engaging portion 207B. Multiple engaging portions 207B engage with the lower buffer portion 204B. Specifically, the multiple engaging portions 207B are provided in the upper buffer portion 206B such that they protrude in any of the first directions D1. When the multiple engaging portions 205B are provided in a protruding manner, the multiple engaging portions 207B can also be provided in the upper buffer portion 206B such that they are recessed in any of the first directions D1.

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

[0080] Here, the starting point 201 of the buffer section 200 in Embodiment 2 will be described. Figure 12 This is a partial cross-sectional view of the energy storage device showing the state when tensile stress in the vertical direction is generated in the buffer section in Embodiment 2. (See attached image.) Figure 11 as well as Figure 12 As shown, in Embodiment 2, the buffer portion 200 is also configured to separate in the vertical direction Z when a tensile stress in the vertical direction Z is generated. Figure 11 as well as Figure 12 Specifically, the diagram illustrates the change in state when the upper plate 310 is to be detached from the plurality of energy storage units 100. Figure 11 as well as Figure 12 More specifically, the diagram shows the change in the state of the upper plate portion 310 when it is pulled upward from near the end edge 202 of the buffer portion 200.

[0081] In embodiment 2, the cut portion 201B functions as the starting point portion 201. For example... Figure 11 as well as Figure 12 As shown, due to the aforementioned pulling, the upper buffer portion 206B is pulled upwards near the end edge 202. Furthermore, when the upper buffer portion 206B is pulled upwards, the engagement between the multiple engaging portions 207B and the lower buffer portion 204B is released. Specifically, the engagement between the multiple engaging portions 207B and the multiple engaged portions 205B is released. As a result, the main body 210 of the buffer portion 200 separates in the vertical direction Z. Consequently, the upper plate portion 310 is detached from the multiple energy storage units 100.

[0082] Furthermore, in this embodiment, the main body 210 of the buffer section 200 is separated in the vertical direction Z without causing damage. Therefore, the energy storage device 10B of Embodiment 2 can also be easily assembled with the lower buffer section 204B and the upper buffer section 206B during the production of the energy storage device 10B.

[0083] As described above, in the energy storage device 10B of Embodiment 2 of this disclosure, the buffer portion 200 has a cutout portion 201B extending from the end edge 202 toward the interior as a starting point portion 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 vertical direction Z along the cut portion 201B.

[0085] In addition, 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 portion. The upper buffer portion 206B is located above the cutout portion. The upper buffer portion 206B has an engaging portion 207B. The engaging portion 207B engages with the lower buffer portion 204B in such a way 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 when not undergoing maintenance, the engagement of the engaging part 207B with the lower buffer part 204B can prevent the upper buffer part 206B and the lower buffer part 204B from separating.

[0087] (Implementation Method 3)

[0088] Next, the energy storage device according to Embodiment 3 of this disclosure will be described. The main difference between the energy storage device of Embodiment 3 and the energy storage device 10 of Embodiment 1 is the configuration of the buffer section. Furthermore, the same configuration and effects as those of the energy storage device 10 of Embodiment 1 will not be described again.

[0089] Figure 13 This is a partial cross-sectional view of the energy storage device according to Embodiment 3 of this disclosure. (As shown...) Figure 13 As shown, in the energy storage device 10C of Embodiment 3 of this disclosure, the first adhesive material layer 220 includes a strong adhesive portion 221C and a weak adhesive portion 222C. The weak adhesive portion 222C serves as a starting point portion 201 and joins the main body portion 210 and the upper plate portion 310 together with a weaker bonding strength than the strong adhesive portion 221C.

[0090] Figure 14 This is a partial cross-sectional view of the energy storage device showing the state when tensile stress in the buffer section is generated in the vertical direction in Embodiment 3. Figure 15 It shows the continuation Figure 14 A partial cross-sectional view of the energy storage device in a state where tensile stress in the vertical direction is further generated in the buffer section.

[0091] like Figures 13-15 As shown, according to the above configuration, when the end of the upper plate portion 310 is lifted upwards, the first adhesive material layer 220 and the main body portion 210 can be easily separated in the vertical direction Z, starting from the release of the bond between the weak adhesive portion 222C and the main body portion 210. Furthermore, during normal use, not for maintenance, the strong adhesive portion 221C can be used to prevent the bond between the first adhesive material layer 220 and the main body portion 210 from being released.

[0092] Furthermore, in this embodiment, the first adhesive material layer 220 includes a plurality of strong adhesive portions 221C and a plurality of weak adhesive portions 222C, wherein the plurality of weak adhesive portions 222C include the weak adhesive portion 222C that serves as the aforementioned starting point portion 201. The plurality of strong adhesive portions 221C and weak adhesive portions 222C are arranged alternately in the first direction D1.

[0093] Based on the above configuration, it is possible to achieve a balance between the ease of separation of the first adhesive material layer 220 from the main body 210 and the bonding force between the first adhesive material layer 220 and the main body 210.

[0094] In the above description of the embodiments, the components that can be combined can also be combined with each other.

[0095] Embodiments of this utility model have been described, but it should be considered that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of this utility model is defined by the claims and is intended to include all modifications within the scope and equivalent meaning of the claims.

Claims

1. An energy storage device capable of being mounted on a vehicle, The energy storage device includes: Multiple energy storage units are arranged in the first horizontal direction; A buffer section, which engages with the upper portion of each of the plurality of energy storage units, extends in the first direction; and The upper plate portion is positioned above the buffer portion and engages with it. The buffer section is configured to separate in the vertical direction when tensile stress is generated in the vertical direction. The buffer portion has a starting point portion at its end edge in the first direction, which serves as the starting point for separation of the buffer portion.

2. The energy storage device according to claim 1, The buffer section has an opening facing the first direction as the starting point.

3. The energy storage device according to claim 2, The buffer section has a plurality of gaps arranged in the first direction.

4. The energy storage device according to claim 1, The buffer portion has a cutout extending inward from the end edge as the starting point.

5. The energy storage device according to claim 4, The buffer section includes a lower buffer section located below the cut section and an upper buffer section located above the cut section. The upper buffer portion has an engaging portion that engages with the lower buffer portion in such a way that the engagement with the lower buffer portion is released when the upper buffer portion is pulled upward.

6. The energy storage device according to claim 1, The buffer section includes: A plate-shaped main body extends in the first direction; and An adhesive layer is used to join the main body and the upper plate together. The adhesive material layer includes a strong adhesive portion and a weak adhesive portion that serves as the starting point and joins the main body portion and the upper plate portion together with a weaker bonding strength than the strong adhesive portion.

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