Power storage device

Abstract

To provide a power storage device having high rigidity to input of loads from above.SOLUTION: In a power storage device, a plurality of cells 100 are arranged in a first direction D1 along a horizontal direction. A plurality of buffer parts 200 are arranged on the plurality of cells 100. Each of the plurality of cells 100 has an upper surface part 101 pointing upward. The upper surface part 101 has a first edge 102 and a second edge 103. The first edge 102 is an edge at one side in the first direction D1, and the second edge 103 is an edge at the other side in the first direction D1. The first edge 102 and the second edge 103 extend along the horizontal direction and also along a second direction D2 crossing the first direction D1. The plurality of buffer parts 200 are separated from each other on the upper surface parts 101 of the plurality of cells 100 and are provided on at least either of the first edges 102 and the second edges 103 of the plurality of cells 100.SELECTED DRAWING: Figure 8

Description

[Technical Field]

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

[0002] Japanese Patent Application Laid-Open Publication No. 2020-142589 (Patent Document 1) discloses that a battery pack is disposed below a floor panel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-142589 Summary of the Invention [Problem to be solved by the invention]

[0004] A variety of electric storage device structures have been studied to increase the energy density of the vehicle-mounted electric storage device. For example, a design in which the electric storage device is located below the floor panel and is as close to the floor panel as possible, or in which the electric storage device itself constitutes part of the floor panel, has been considered. However, if the electric storage device is designed in this manner, there is a possibility that a load from above the electric storage device may be input due to a load from inside the vehicle compartment, i.e., from above.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and has an object to provide an electricity storage device that has high rigidity against input of a load from above. [Means for solving the problem]

[0006] An electric storage device according to an aspect of the present disclosure is mountable on a vehicle. The electric storage device includes a plurality of cells and a plurality of buffer sections. The plurality of cells are aligned in a first direction along the horizontal direction. The plurality of buffer sections are disposed on the plurality of cells. Each of the plurality of cells has an upper surface portion facing upward. The upper surface portion has a first edge and a second edge. The first edge is an edge on one side in the first direction. The second edge is an edge on the other side in the first direction. The first edge and the second edge extend along the horizontal direction and a second direction perpendicular to the first direction. The plurality of buffer sections are spaced apart from each other on the upper surface portions of the plurality of cells and are provided on at least one of the first edge and the second edge of each of the plurality of cells.

[0007] In an electricity storage device according to an aspect of the present disclosure, the plurality of buffer portions are preferably provided on both the first end edge and the second end edge of each of the plurality of cells, spaced apart from one another on the upper surface portion of the plurality of cells.

[0008] In an electricity storage device according to an aspect of the present disclosure, among the plurality of buffering sections, buffering sections that are provided in different cells and adjacent to each other in the first direction are preferably continuous with each other.

[0009] Preferably, the power storage device according to an aspect of the present disclosure further includes a plate-shaped portion that is provided to cover the plurality of buffer portions, and the plurality of buffer portions are formed integrally with the plate-shaped portion.

[0010] The power storage device according to an aspect of the present disclosure preferably further includes an elastic member disposed on an upper surface portion of at least one of the plurality of cells between the plurality of buffer portions.

[0011] The power storage device according to an aspect of the present disclosure preferably further includes a pack. The pack houses a plurality of cells provided with a plurality of buffer sections. The pack can be fixed to a body of a vehicle. The plurality of buffer sections are integrally formed with the pack.

[0012] The power storage device according to an aspect of the present disclosure preferably further includes a plurality of spacers, each spacer being disposed between adjacent cells among the plurality of cells, and each spacer being integrally formed with each of the plurality of buffer sections.

[0013] In an electricity storage device according to an aspect of the present disclosure, each of the plurality of cells preferably includes an electrode assembly and a cell case, the cell case houses the electrode assembly, and the plurality of buffer portions are formed integrally with the cell case by folding the cell case of each of the plurality of cells in a convex shape facing outward. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to provide an electricity storage device that has high rigidity against input of a load from above. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing a vehicle equipped with a power storage device according to a first embodiment of the present disclosure. [Figure 2] 1 is a schematic perspective view showing a vehicle body of a vehicle equipped with a power storage device according to a first embodiment of the present disclosure. [Figure 3] 3 is a schematic cross-sectional view of a part of the vehicle of FIG. 1, as viewed from the direction of the arrows along line III-III. [Figure 4] 1 is a plan view showing an electricity storage device according to a first embodiment of the present disclosure together with a cross member of a vehicle body. [Figure 5] 1 is an exploded perspective view showing an electricity storage device according to a first embodiment of the present disclosure. [Figure 6] 6 is a cross-sectional view of the electricity storage device of FIG. 4, seen from the direction of the arrows along line VI-VI. [Figure 7] FIG. 2 is a schematic cross-sectional view of the electricity storage module. [Figure 8] 8 is a cross-sectional view of the electricity storage device of FIG. 4, as seen from the direction of the arrows along line VIII-VIII. [Figure 9] FIG. 4 is a cross-sectional view showing an electricity storage device according to a modified example of the first embodiment of the present disclosure. [Figure 10] FIG. 6 is a partial cross-sectional view showing an electricity storage device according to a second embodiment of the present disclosure. [Figure 11] FIG. 10 is a partial cross-sectional view showing an electricity storage device according to a third embodiment of the present disclosure. [Figure 12] FIG. 10 is a cross-sectional view showing an electricity storage device according to a fourth embodiment of the present disclosure. [Figure 13] FIG. 10 is a cross-sectional view showing an electricity storage device according to a modified example of the fourth embodiment of the present disclosure. [Figure 14] FIG. 10 is a partial cross-sectional view showing an electricity storage device according to a fifth embodiment of the present disclosure. [Figure 15] FIG. 10 is a partial cross-sectional view showing an electricity storage device according to a sixth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a power storage device according to each embodiment of the present disclosure will be described with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and description thereof will not be repeated.

[0017] (Embodiment 1) Fig. 1 is a schematic diagram showing a vehicle equipped with a power storage device according to a first embodiment of the present disclosure. As shown in Fig. 1, a power storage device 10 according to the first embodiment of the present disclosure is an power storage device 10 that can be mounted on a vehicle 1. First, the vehicle 1 will be described.

[0018] The vehicle 1 according to the first embodiment is, for example, an electric vehicle such as an electric vehicle or a hybrid vehicle that can be driven by a motor. Fig. 2 is a schematic perspective view showing a vehicle body of a vehicle equipped with a power storage device according to the first embodiment of the present disclosure. Fig. 3 is a schematic cross-sectional view of a part of the vehicle in Fig. 1 as viewed from the direction of the arrows along line III-III. As shown in Figs. 1 to 3, the vehicle 1 according to the first embodiment of the present disclosure includes a power storage device 10 and a vehicle body 2 to which the power storage device 10 is fixed. The fore-and-aft direction of the vehicle 1 or the vehicle body 2 is parallel to a first direction D1, described below, of the power storage device 10.

[0019] The vehicle body 2 includes, as frame members of the vehicle 1, a plurality of cross members 3, a left side sill 4a, a right side sill 4b, a left side member 5a, and a right side member 5b.

[0020] Each of the multiple cross members 3 extends in the left-right direction of the vehicle body 2. The left-right direction or vehicle width direction of the vehicle 1 or the vehicle body 2 is parallel to a second direction D2 (described later) of the electricity storage device 10. The multiple cross members 3 are aligned with one another in the first direction D1. The vehicle body 2 may include only a single cross member 3.

[0021] The left side sill 4a is disposed on the left side in the left-right direction of the vehicle 1. The left side sill 4a extends in the front-rear direction of the vehicle 1. The right side sill 4b is disposed on the right side in the left-right direction of the vehicle 1. The right side sill 4b extends in the front-rear direction of the vehicle 1. Each of the multiple cross members 3 extends from the inside of the left side sill 4a to the inside of the right side sill 4b.

[0022] 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 center of the vehicle in the vehicle width direction than the left side sill 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 center of the vehicle in the vehicle width direction than the right side sill 4b.

[0023] Next, details of the power storage device 10 according to the first embodiment of the present disclosure will be described. Fig. 4 is a plan view showing the power storage device according to the first embodiment of the present disclosure together with a cross member of a vehicle body.

[0024] 3 and 4, the power storage device 10 includes a plurality of power storage modules 50. The plurality of power storage modules 50 are disposed below the cross member 3.

[0025] Each of the multiple energy storage modules 50 extends in a first direction D1. The first direction D1 is a direction along the horizontal direction. When viewed from the vertical direction Z, each of the multiple energy storage modules 50 is arranged so as to intersect with at least one cross member 3. When viewed from the vertical direction Z, each of the multiple energy storage modules 50 is arranged so as to intersect with multiple cross members 3. The multiple energy storage modules 50 are lined up in a second direction D2. The second direction D2 is a direction along the horizontal direction. The second direction D2 is a direction perpendicular to the first direction D1. In this embodiment, the multiple energy storage modules 50 are lined up only in the second direction D2.

[0026] The energy storage device 10 is required to include at least one energy storage module 50. The energy storage device 10 may include only one energy storage module 50. The multiple energy storage modules 50 may be arranged side by side in the first direction D1. The multiple energy storage modules 50 may be arranged side by side in the first direction D1 and also in the second direction D2. The multiple energy storage modules 50 may be arranged side by side only in the first direction D1.

[0027] Next, the details of the energy storage module 50 will be described. Fig. 5 is an exploded perspective view showing the energy storage device according to the first embodiment of the present disclosure. Fig. 6 is a cross-sectional view of the energy storage device of Fig. 4 as seen from the direction of the arrows along line VI-VI. Fig. 7 is a schematic cross-sectional view of the energy storage module. Fig. 7 shows the same cross-sectional view as Fig. 6. Fig. 8 is a cross-sectional view of the energy storage device of Fig. 4 as seen from the direction of the arrows along line VIII-VIII.

[0028] As shown in FIGS. 5 to 8, each of the plurality of power storage modules 50 includes a plurality of cells 100, a plurality of buffer sections 200 (see FIG. 8), and a plate-shaped section 300.

[0029] Each of the plurality of cells 100 is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, etc. The plurality of cells 100 are arranged in a first direction D1.

[0030] Each of the multiple cells 100 has an upper surface 101 facing upward. The upper surface 101 has a first edge 102 and a second edge 103. The first edge 102 is an edge on one side in a first direction D1. The second edge 103 is an edge on the other side in the first direction D1. The first edge 102 and the second edge 103 extend horizontally and along a second direction D2 that is perpendicular to the first direction D1.

[0031] Each of the multiple cells 100 further has a first end surface portion 104, a second end surface portion 105, a bottom surface portion 106, a first side surface portion 107, and a second side surface portion 108. The first end surface portion 104 extends downward from the first edge 102. The second end surface portion 105 extends downward from the second edge 103. The bottom surface portion 106 is located on the opposite side from the top surface portion 101. The bottom surface portion 106 is connected to the first end surface portion 104 and the second end surface portion 105.

[0032] The first side surface portion 107 faces one side of the second direction D2. The second side surface portion 108 faces the other side of the second direction D2. The first side surface portion 107 and the second side surface portion 108 are connected to the top surface portion 101, the first end surface portion 104, the second end surface portion 105, and the bottom surface portion 106.

[0033] Each of the multiple cells 100 includes an electrode assembly 110 and a cell case 120. The electrode assembly 110 includes a positive electrode layer, a negative electrode layer, and a separator (none of which are shown). The separator is interposed between the positive electrode layer and the negative electrode layer. The positive electrode layer and the negative electrode layer may be stacked in a first direction D1 with the separator interposed therebetween. The positive electrode layer and the negative electrode layer may be wound around the axial direction of a second direction D2 with the separator interposed therebetween.

[0034] The cell case 120 houses the electrode assembly 110. The cell case 120 may be made of a metal such as aluminum or an aluminum alloy. The cell case 120 forms at least a portion of each of the top surface 101, the first end surface 104, the second end surface 105, and the bottom surface 106. The cell case 120 forms at least the first end edge 102 and the second end edge 103. The cell case 120 has a so-called rectangular shape.

[0035] In cell casing 120, first edge 102 and second edge 103 may be connected to first end surface portion 104 and second end surface portion 105, respectively, by welding. First edge 102 and second edge 103 may be formed by bending cell casing 120.

[0036] The plurality of buffer sections 200 are arranged on the plurality of cells 100. The plurality of buffer sections 200 are spaced apart from one another on the upper surface 101 of the plurality of cells 100 and are provided on at least one of the first end edge 102 and the second end edge 103 of each of the plurality of cells 100. The plurality of buffer sections 200 are spaced apart from one another on the upper surface 101 of the plurality of cells 100 and are provided on both the first end edge 102 and the second end edge 103 of each of the plurality of cells 100. Of the plurality of buffer sections 200, buffer sections 200 that are provided on different cells 100 and that are adjacent in the first direction D1 are continuous with each other. The materials constituting the plurality of buffer sections 200 will be described later.

[0037] The plate-shaped portion 300 is provided so as to cover the multiple buffer portions 200. The plate-shaped portion 300 has a uniform thickness. The plate-shaped portion 300 extends horizontally. The plate-shaped portion 300 extends in a first direction D1. The plate-shaped portion 300 intersects with the multiple cross members 3 when viewed from the vertical direction Z. The plate-shaped portion 300 is separated from the multiple cells 100. An example of the plate-shaped portion 300 is a surface pressure distribution board. The material constituting the plate-shaped portion 300 will be described later.

[0038] In this embodiment, the plurality of buffer sections 200 are integrally formed with the plate-shaped section 300. The plurality of buffer sections 200 protrude downward from the plate-shaped section 300.

[0039] The power storage device 10 further includes a pack 400. The pack 400 houses a plurality of cells 100 provided with a plurality of buffer sections 200, and a plate-shaped section 300. That is, the pack 400 houses a plurality of power storage modules 50. The pack 400 can be fixed to the body 2 of the vehicle 1. Specifically, the pack 400 is configured to be able to be fixed to a frame member of the body 2 of the vehicle 1.

[0040] 3, in the vehicle 1 according to this embodiment, one end of the pack 400 in the second direction D2 is fixed to the left side member 5a by a first fastening member 6a such as a bolt, and the other end of the pack 400 in the second direction D2 is fixed to the right side member 5b by a second fastening member 6b such as a bolt.

[0041] One end of the pack 400 in the second direction D2 may be fixed to the left side sill 4a, and the other end of the pack 400 in the second direction D2 may be fixed to the right side sill 4b.

[0042] As shown in Figures 3 and 4, the pack 400 is disposed below the multiple cross members 3. The pack 400 extends in a first direction D1. When viewed from the vertical direction Z, the pack 400 is disposed so as to intersect with the multiple cross members 3. The pack 400 also functions as a floor member that defines the interior of the vehicle cabin.

[0043] As shown in Figures 5 and 6, the pack 400 includes an upper plate portion 410, a lower plate portion 420, and a peripheral wall portion 430. The upper plate portion 410 is disposed above the multiple plate-shaped portions 300. The lower plate portion 420 is disposed below the energy storage modules 50. The peripheral wall portion 430 extends downward from the outer circumferential edge of the upper plate portion 410. The peripheral wall portion 430 extends in the horizontal direction so as to surround the multiple energy storage modules 50. The peripheral wall portion 430 is connected to the lower plate portion 420.

[0044] Here, a description will be given of the materials that make up the plurality of buffer sections 200 and the plate-shaped section 300. In this embodiment, the plurality of buffer sections 200 and the plate-shaped section 300 are made of a material that is more rigid than the upper plate section 410.

[0045] The specific material forming the plurality of buffer sections 200 and the plate-shaped section 300 is not particularly limited. The plurality of buffer sections 200 and the plate-shaped section 300 are preferably made of, for example, a resin member. The resin member preferably has a higher heat resistance temperature than the material forming the upper plate section 410. The resin member preferably has a lower thermal conductivity than the material forming the upper plate section 410. Using such a material for the resin member makes it possible to suppress a rise in temperature inside the vehicle cabin when the power storage module 50 generates abnormal heat.

[0046] The resin member constituting the plurality of buffer sections 200 and the plate-shaped section 300 may contain a thermosetting resin. The resin member may be made of glass fiber reinforced plastic. The resin member may contain a foamed resin. The foamed resin preferably has a heat resistance temperature of 400°C or higher.

[0047] The energy storage device 10 may further include a plurality of restraining members 510 in each of the plurality of energy storage modules 50. The plurality of restraining members 510 extend from one side to the other side of the energy storage module 50 in the first direction D1. A load is applied to the plurality of cells 100 in the first direction D1 by the plurality of restraining members 510. The plurality of restraining members 510 fix the relative positions of the plurality of cells 100 to one another. The plurality of restraining members 510 each cover four corners of each of the plurality of cells 100 when viewed from the first direction D1.

[0048] In this embodiment, the energy storage device 10 may further include a first adhesive 520 in each of the multiple energy storage modules 50. The first adhesive 520 is disposed between the upper plate portion 410 and the plate-shaped portion 300. The first adhesive 520 bonds the upper plate portion 410 and the plate-shaped portion 300 together. This allows the plate-shaped portion 300 to suppress deformation of the upper plate portion 410.

[0049] The energy storage device 10 may further include a cooling plate 530. The cooling plate 530 is provided below the plurality of energy storage modules 50. The cooling plate 530 may be provided above the plurality of energy storage modules 50. A flow circuit (not shown) is formed inside the cooling plate 530, through which a refrigerant such as air or a coolant can flow.

[0050] The energy storage device 10 may further include a tray 540. The tray 540 is provided below the plurality of energy storage modules 50. The energy storage device 10 may further include a second adhesive 550 in each of the plurality of energy storage modules 50. The second adhesive 550 is disposed between the plurality of cells 100 and the tray 540. The second adhesive 550 bonds the plurality of cells 100 and the tray 540 together.

[0051] 8, for ease of explanation, the multiple cells 100 are shown spaced apart from each other, but the multiple cells 100 may be closely spaced from each other in the first direction D1. Other members such as spacers may be interposed between the multiple cells 100.

[0052] FIG. 9 is a cross-sectional view showing an energy storage device according to a modified example of the first embodiment of the present disclosure. In FIG. 9 and subsequent figures, a cross-sectional view similar to the cross-sectional view of the first embodiment shown in FIG. 8 is shown. As shown in FIG. 9, the energy storage device 10a may further include a plurality of spacers 600 in each of the plurality of energy storage modules 50. The plurality of spacers 600 are respectively arranged between adjacent cells 100 among the plurality of cells 100. The plurality of spacers 600 are formed, for example, from resin. Ends of the respective spacers 600 may be arranged between the buffer sections 200 that are provided in different cells 100 among the plurality of buffer sections 200 and that are adjacent in the first direction D1.

[0053] As described above, the energy storage device 10 according to the first embodiment of the present disclosure can be mounted on a vehicle 1. The energy storage device 10 includes a plurality of cells 100 and a plurality of buffer sections 200. The plurality of cells 100 are aligned in a first direction D1 that is along the horizontal direction. The plurality of buffer sections 200 are disposed on the plurality of cells 100. Each of the plurality of cells 100 has an upper surface portion 101 that faces upward. The upper surface portion 101 has a first edge 102 and a second edge 103. The first edge 102 is an edge on one side in the first direction D1. The second edge 103 is an edge on the other side in the first direction D1. The first edge 102 and the second edge 103 extend along the horizontal direction and a second direction D2 that is perpendicular to the first direction D1. The buffer sections 200 are provided on at least one of the first edge 102 and the second edge 103 of each of the cells 100 while being spaced apart from one another on the upper surface 101 of the cells 100 .

[0054] According to the above configuration, the input of a load from above the energy storage device 10 can be transmitted to at least one of the first edge 102 and the second edge 103, which have relatively high rigidity, of the upper surface portion 101 of the cell 100, via the buffer portion 200. This makes it possible to increase the rigidity of the energy storage device 10 against the input of a load from above.

[0055] In addition, in the first embodiment, a plurality of buffer sections 200 are provided on both the first edge 102 and the second edge 103 of each of the plurality of cells 100 while being spaced apart from one another on the upper surface 101 of the plurality of cells 100.

[0056] According to the above configuration, a load input from above the power storage device 10 can be transmitted to both the first edge 102 and the second edge 103 via the buffer section 200. This makes it possible to further increase the rigidity of the power storage device 10 against the input of a load from above.

[0057] In the first embodiment, among the plurality of buffer sections 200, the buffer sections 200 that are provided in different cells 100 and that are adjacent to each other in the first direction D1 are continuous with each other.

[0058] According to the above configuration, it is possible to suppress the input of load between the first end edge 102 and the second end edge 103 of each cell 100, while further increasing the rigidity of the buffer section 200.

[0059] The energy storage device 10 according to the first embodiment further includes a plate-shaped portion 300. The plate-shaped portion 300 is provided so as to cover the plurality of buffer portions 200. The plurality of buffer portions 200 are formed integrally with the plate-shaped portion 300.

[0060] According to the above configuration, a load input from above the plate-shaped portion 300 is more reliably input to the first edge 102 and the second edge 103 of each cell 100 via the plate-shaped portion 300 and the plurality of buffer portions 200. This makes it possible to more reliably increase the rigidity of the energy storage device 10 against input of a load from above.

[0061] (Embodiment 2) Next, a description will be given of an energy storage device according to a second embodiment of the present disclosure. The energy storage device according to the second embodiment of the present disclosure differs from the energy storage device 10 according to the first embodiment of the present disclosure mainly in that the energy storage device according to the second embodiment of the present disclosure includes an elastic member. Note that the description of the same configuration and effects as those of the energy storage device 10 according to the first embodiment of the present disclosure will not be repeated.

[0062] Fig. 10 is a partial cross-sectional view showing an energy storage device according to a second embodiment of the present disclosure. As shown in Fig. 10, the energy storage device 10b further includes a plurality of elastic members 700 in each of the plurality of energy storage modules 50. The elastic members 700 are disposed on the upper surface portion 101 of at least one of the plurality of cells 100 between the plurality of buffer portions 200.

[0063] According to the above configuration, when a load is input to the upper surface portion 101 from between the buffer portions 200 via the elastic member 700, the elastic member 700 deforms, thereby preventing the load from being input locally to the upper surface portion 101.

[0064] Each of the plurality of elastic members 700 may be disposed on the upper surface of each of the plurality of cells 100 in the plurality of gaps between the plurality of buffer sections 200 .

[0065] (Embodiment 3) Next, a description will be given of a power storage device according to a third embodiment of the present disclosure. 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 in the configuration of the buffer section. Note that the description of the same configuration and effects as those of the power storage device 10 according to the first embodiment of the present disclosure will not be repeated.

[0066] Fig. 11 is a partial cross-sectional view showing an electricity storage device according to a third embodiment of the present disclosure. As shown in Fig. 11, in an electricity storage device 10c according to the third embodiment, a plurality of buffer sections 200 are formed integrally with a pack 400c.

[0067] According to the above configuration, a load input from above the pack 400c is more reliably input to the first edge 102 and the second edge 103 of each cell 100 via the pack 400c and the multiple buffer sections 200. Furthermore, there is no need to provide other members between the buffer sections 200 and the pack 400c in the vertical direction. This allows the height of the energy storage device 10 to be further reduced, and also makes it possible to more reliably increase the rigidity of the energy storage device 10 against the input of a load from above.

[0068] Specifically, the plurality of buffer sections 200 are integrally formed with the upper plate section 410 of the pack 400c. The plurality of buffer sections 200 protrude downward from the upper plate section 410 of the pack 400c.

[0069] (Embodiment 4) Next, a description will be given of a power storage device according to a fourth embodiment of the present disclosure. The power storage device according to the fourth embodiment of the present disclosure has a different buffer configuration from the power storage device 10a according to the modified example of the first embodiment of the present disclosure. Note that the description of the same configuration and effects as those of the power storage device 10a according to the modified example of the first embodiment of the present disclosure will not be repeated.

[0070] 12 is a cross-sectional view showing an energy storage device according to Embodiment 4 of the present disclosure. In an energy storage device 10d according to Embodiment 4, a plurality of spacers 600d are formed integrally with a plurality of buffer sections 200, respectively.

[0071] According to the above configuration, in the energy storage device 10 including the plurality of spacers 600d, an increase in the number of parts due to the provision of the plurality of buffer sections 200 can be suppressed.

[0072] The plurality of buffering sections 200da extend along the first direction D1 from both sides of each of the plurality of spacers 600da in the first direction D1. In the fourth embodiment, the plate-shaped section 300d is formed of a member separate from the plurality of buffering sections 200. However, the plate-shaped section 300d may also be formed integrally with the plurality of buffering sections 200.

[0073] 13 is a cross-sectional view showing a power storage device according to a modified example of the fourth embodiment of the present disclosure. As shown in FIG. 13, each of the buffer portions 200da may extend only on one side of each of the spacers 600da in the first direction D1.

[0074] (Embodiment 5) Finally, a description will be given of a power storage device according to a fifth embodiment of the present disclosure. The power storage device according to the fifth embodiment of the present disclosure differs from the power storage device 10 according to the first embodiment of the present disclosure in the configuration of the buffer unit. Note that the description of the same configuration and effects as those of the power storage device 10 according to the first embodiment of the present disclosure will not be repeated.

[0075] Fig. 14 is a partial cross-sectional view showing an energy storage device according to embodiment 5 of the present disclosure. As shown in Fig. 14, in an energy storage device 10e according to embodiment 5, the buffer sections 200e are formed integrally with the cell cases 120e of the respective cells 100 by bending the cell cases 120e outward in a convex shape.

[0076] According to the above configuration, an increase in the number of parts in the power storage device 10 due to the provision of a plurality of buffer sections 200 can be suppressed.

[0077] In the fifth embodiment, the plate-shaped portion 300e is made of a separate member from the plurality of buffer portions 200e.

[0078] The folded shape of the cell casing 120e is not limited to the shape shown in Fig. 15. Fig. 15 is a partial cross-sectional view showing an electricity storage device according to a sixth embodiment of the present disclosure. As shown in Fig. 15, each of the plurality of cells 100 may further have a convex portion 121ea formed by bending a portion of the upper surface portion 101 of the cell casing 120ea in an outwardly convex shape. The convex portion 121ea is in contact with the plate-shaped portion 300e.

[0079] In the above description of the embodiments, configurations that can be combined may be combined with each other.

[0080] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0081] REFERENCE SIGNS LIST 1 vehicle, 2 vehicle body, 3 cross member, 4a left side sill, 4b right side sill, 5a left side member, 5b right side member, 6a first fastening member, 6b second fastening member, 10, 10a, 10b, 10c, 10d, 10e energy storage device, 50 energy storage module, 100 cell, 101 upper surface portion, 102 first edge, 103 second edge, 104 first end surface portion, 105 second end surface portion, 106 bottom surface portion, 107 first side surface portion, 108 second side surface portion, 110 electrode body, 120, 120e, 120ea cell case, 121ea convex portion, 200, 200da, 200e buffer portion, 300, 300d, 300e plate-shaped portion, 400, 400c pack, 410 Upper plate portion, 420 lower plate portion, 430 peripheral wall portion, 510 restraining member, 520 first adhesive, 530 cooling plate, 540 tray, 550 second adhesive, 600, 600d, 600da spacers, 700 elastic member, D1 first direction, D2 second direction, Z up-down direction.

Claims

1. A power storage device that can be mounted on a vehicle, A plurality of cells arranged in a first direction along the horizontal direction; a plurality of buffers disposed on the plurality of cells; Each of the plurality of cells has an upper surface portion facing upward, the upper surface portion has a first edge that is an edge on one side in the first direction and a second edge that is an edge on the other side, the first edge and the second edge extend along the horizontal direction and along a second direction perpendicular to the first direction, The plurality of buffer portions are spaced apart from one another on the top surface portions of the plurality of cells and are provided on at least one of the first end edge and the second end edge of each of the plurality of cells.

2. 2 . The power storage device according to claim 1 , wherein the buffer portions are spaced apart from one another on the upper surface portions of the cells and are provided on both the first end edge and the second end edge of each of the cells.

3. The power storage device according to claim 1 , wherein among the plurality of buffer sections, buffer sections that are provided in different cells and that are adjacent to each other in the first direction are continuous with each other.

4. Further, a plate-shaped portion is provided so as to cover the plurality of buffer portions, The power storage device according to claim 1 , wherein the plurality of buffer portions are formed integrally with the plate-shaped portion.

5. The power storage device according to claim 2 , further comprising an elastic member disposed on the top surface portion of at least one of the plurality of cells between the plurality of buffer portions.

6. a pack that houses the plurality of cells provided with the plurality of buffer sections and can be fixed to a body of the vehicle; The power storage device according to claim 1 , wherein the plurality of buffer sections are formed integrally with the pack.

7. Further, a plurality of spacers are disposed between adjacent cells among the plurality of cells, The power storage device according to claim 1 , wherein the plurality of spacers are formed integrally with the plurality of buffer portions, respectively.

8. Each of the plurality of cells includes an electrode assembly and a cell case that houses the electrode assembly; 6. The energy storage device according to claim 1, wherein the plurality of buffer portions are formed integrally with the cell cases of the respective plurality of cells by bending the cell cases of the respective plurality of cells in a convex shape toward the outside.

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