Power storage device

Abstract

To provide a power storage device capable of suppressing both vibrations of the power storage device to a vehicle and contact of an upper cover with a power storage stack.SOLUTION: A power storage device 1 includes: a power storage stack 100 including a plurality of power storage cells 110; a lower case 200 accommodating the power storage stack; an upper cover 300 covering the power storage stack; an outside elastic body 500 made of an elastic material and provided on an outer surface of the upper cover; and an inside elastic body 600 made of an elastic material and provided on an inner surface of the upper cover. The inside elastic body has a spring constant larger than a spring constant of the outside elastic body.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] For example, Japanese Patent Application Laid-Open No. 10-69893 discloses a battery pack comprising a case for housing batteries and a rubber sponge provided on the inner surface of the upper case of the case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-69893 Summary of the Invention [Problem to be solved by the invention]

[0004] When an electric storage device as described in JP-A-10-69893 is mounted on a vehicle, it is required to reduce vibration of the electric storage device relative to the vehicle. In addition, there is a concern that the upper cover may come into contact with the electric storage stack when a downward load is applied to the electric storage device from above.

[0005] An object of the present disclosure is to provide an electricity storage device that is capable of suppressing both vibration of the electricity storage device relative to a vehicle and contact of the upper cover with the electricity storage stack. [Means for solving the problem]

[0006] An energy storage device according to one aspect of the present disclosure comprises a energy storage stack including a plurality of energy storage cells, a lower case that houses the energy storage stack, an upper cover that covers the energy storage stack, an outer elastic body made of an elastic material and provided on an outer surface of the upper cover, and an inner elastic body made of an elastic material and provided on an inner surface of the upper cover, wherein the inner elastic body has a spring constant greater than a spring constant of the outer elastic body. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide an electricity storage device that is capable of suppressing both vibration of the electricity storage device relative to a vehicle and contact of the upper cover with the electricity storage stack. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view illustrating a schematic configuration of an electricity storage device according to an embodiment of the present disclosure. [Diagram 2] 2 is a perspective view illustrating a state in which an upper cover is removed from the power storage device illustrated in FIG. 1. FIG. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 2 is a perspective view showing an outer elastic body and an inner elastic body. [Diagram 5] 1 is a diagram illustrating a schematic diagram of a CAE analysis result of a stress distribution generated in the outer elastic body when a uniform load acts on an upper surface of the outer elastic body. FIG. [Figure 6] FIG. 11 is a plan view illustrating a modification of the outer elastic body. [Figure 7] FIG. 11 is a plan view illustrating a modification of the outer elastic body. [Figure 8] FIG. 11 is a plan view illustrating a modification of the outer elastic body. [Figure 9] FIG. 11 is a plan view illustrating a modification of the outer elastic body. [Figure 10] FIG. 13 is a perspective view showing a schematic modification of the outer elastic body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present disclosure will now be described with reference to the accompanying drawings, in which the same or corresponding components are designated by the same reference numerals.

[0010] Fig. 1 is a perspective view that shows a schematic diagram of a power storage device according to an embodiment of the present disclosure. Fig. 2 is an exploded perspective view of the power storage device shown in Fig. 1. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1. The power storage device 1 is mounted, for example, on the bottom 10 of a vehicle (see Fig. 3).

[0011] As shown in FIGS. 1 to 3, the energy storage device 1 includes at least one energy storage stack 100, a lower case 200, an upper cover 300, a plate material 400, at least one outer elastic body 500, and at least one inner elastic body 600.

[0012] At least one power storage stack 100 includes a plurality of power storage stacks 100. In this embodiment, the power storage device 1 includes six power storage stacks 100. However, the number of power storage stacks 100 is not limited to six.

[0013] Each power storage stack 100 includes a plurality of power storage cells 110 arranged to line up in a first direction. For example, a lithium ion battery is used as each power storage cell 110. Each power storage cell 110 may be configured as an all-solid-state battery using a solid electrolyte. As shown in FIG. 2, each power storage cell 110 is formed in a flat rectangular parallelepiped. The length of the power storage cell 110 in a second direction perpendicular to both the first direction and the vertical direction is longer than the length of the power storage cell 110 in the vertical direction. The multiple power storage stacks 100 are arranged to line up at intervals in the first direction and to line up at intervals in the second direction.

[0014] The lower case 200 houses a plurality of power storage stacks 100. The lower case 200 is open upward. The lower case 200 has a bottom wall 210, a peripheral wall 220, and a load transmitting portion 230.

[0015] The bottom wall 210 supports each power storage stack 100. The bottom wall 210 may include a cooling plate that contacts the bottom of each power storage stack 100.

[0016] The peripheral wall 220 stands upright from the peripheral edge of the bottom wall 210. The peripheral wall 220 surrounds the periphery of the multiple power storage stacks 100.

[0017] The load transmission part 230 transmits a load input downward to the upper cover 300 to the bottom wall 210. The load transmission part 230 stands upright from the bottom wall 210. As shown in FIG. 2, the load transmission part 230 is disposed between a pair of power storage stacks 100 adjacent to each other in the first direction. The load transmission part 230 separates the pair of power storage stacks 100 adjacent to each other in the first direction. The load transmission part 230 is connected to the peripheral wall 220. That is, the load transmission part 230 has a function of reinforcing the peripheral wall 220. As shown in FIG. 3, the height of the load transmission part 230 from the bottom wall 210 is set to be substantially the same as the height of the peripheral wall 220 from the bottom wall 210.

[0018] The upper cover 300 covers the multiple power storage stacks 100. The upper cover 300 opens downward. The upper cover 300 accommodates the power storage stacks 100 together with the lower case 200. A peripheral portion of the upper cover 300 is fixed to the lower case 200 by bolts or the like. The upper cover 300 includes a top wall 310 disposed above the multiple power storage stacks 100. The top wall 310 may be formed in a flat plate shape.

[0019] The plate material 400 presses the multiple power storage stacks 100 against the bottom wall 210. The plate material 400 may be formed in a flat plate shape. The plate material 400 is made of synthetic resin or the like. The plate material 400 is arranged so as to straddle the multiple power storage stacks 100 and the load transmission unit 230. As shown in FIG. 3 , a peripheral portion of the plate material 400 is in contact with an upper surface of the peripheral wall 220.

[0020] At least one outer elastic body 500 includes a plurality of outer elastic bodies 500. Each outer elastic body 500 is provided on the outer surface of the upper cover 300. Each outer elastic body 500 is made of an elastic material such as urethane. Each outer elastic body 500 is formed in a flat rectangular parallelepiped shape. The plurality of outer elastic bodies 500 are arranged at intervals from each other. As shown in FIG. 2 and FIG. 3, each outer elastic body 500 is arranged at a position overlapping with the load transmitting portion 230 in the up-down direction, i.e., above the load transmitting portion 230.

[0021] At least one inner elastic body 600 includes a plurality of inner elastic bodies 600. Each inner elastic body 600 is provided on the inner surface of the upper cover 300. Each inner elastic body 600 is made of an elastic material such as urethane. Each inner elastic body 600 is formed in a flat rectangular parallelepiped shape. Each inner elastic body 600 may be formed in the same shape as the outer elastic body 500. The plurality of inner elastic bodies 600 are arranged at intervals from each other. As shown in FIG. 2 and FIG. 3, each inner elastic body 600 is arranged at a position where it overlaps with the outer elastic body 500 in the up-down direction. Each inner elastic body 600 is arranged above the load transmission part 230. In this embodiment, each inner elastic body 600 is sandwiched between the top wall 310 and the plate material 400 of the upper cover 300.

[0022] The spring constant [N / mm] of each inner elastic body 600 is greater than the spring constant [N / mm] of each outer elastic body 500. The "spring constant" mentioned above includes a static spring constant and a dynamic spring constant. The method for measuring the static spring constant and the dynamic spring constant is based on JIS K 6385. That is, the spring constant is calculated based on the relationship between the load acting on each elastic body 500, 600 and the deflection of each elastic body 500, 600 at that time.

[0023] The hardness (Type C) of each inner elastic body 600 is greater than the hardness (Type C) of each outer elastic body 500. The method for measuring the hardness (Type C) is based on JIS K 7312. That is, when a test piece of each elastic body 500, 600 is pressed with a push pin, the hardness is calculated based on the reaction force acting from the test piece to the push pin.

[0024] 3, the thickness t6 of each inner elastic body 600 is greater than the thickness t5 of each outer elastic body 500. However, the thickness t6 of each inner elastic body 600 may be equal to or smaller than the thickness t5 of each outer elastic body 500.

[0025] One of the outer elastic body 500 and the inner elastic body 600 has an identification element that can be distinguished from the other of the outer elastic body 500 and the inner elastic body 600. In this embodiment, the outer elastic body 500 has an identification element 510 (see Figs. 3 and 4). However, the inner elastic body 600 may have an identification element. Note that the identification element 510 is omitted in Figs. 1 and 2.

[0026] As shown in Figures 3 and 4, the identification element 510 is configured with a notch. The outer elastic body 500 has a long side portion 501 and a short side portion 502 in a plan view, and the notch is formed in the center of the long side portion 501. The notch has a shape that is recessed inward in a direction parallel to the short side portion 502. As shown in Figure 4, the inner elastic body 600 also has a long side portion 601 and a short side portion 602. The position of the notch will be described with reference to Figure 5.

[0027] FIG. 5 shows a schematic diagram of a CAE analysis result of the stress distribution generated in the outer elastic body 500 when a uniform load is applied to the upper surface of the outer elastic body 500. FIG. 5 shows that the highest stress occurs in region A, and the stress decreases in the order of region A, region B, region C, region D, and region E. As shown in FIG. 5, the stress generated in the center of the long side portion 501 is relatively small. Therefore, it can be seen that the cushioning function of the outer elastic body 500 is substantially maintained even when a notch is formed in the center of the long side portion 501. Therefore, in this embodiment, as shown in FIG. 4, a notch is formed as an identification element 510 in the center of the long side portion 501.

[0028] As described above, in the energy storage device 1 of this embodiment, the outer elastic body 500 is provided on the outer surface of the upper cover 300, so that vibration of the energy storage device 1 relative to the vehicle when the energy storage device 1 is mounted on the bottom 10 of the vehicle is effectively suppressed. Furthermore, the inner elastic body 600 having a relatively large spring constant is provided on the inner surface of the upper cover 300, so that collision of the top wall 310 with the energy storage stack 100 when a downward external force acts on the top wall 310 of the upper cover 300 is suppressed.

[0029] The outer elastic body 500 has the identification element 510, which makes it easy to distinguish between the outer elastic body 500 and the inner elastic body 600. This prevents the outer elastic body 500 and the inner elastic body 600 from being erroneously positioned when assembling the electricity storage device 1.

[0030] The form of the identification element 510 is not limited to the above embodiment, and various modifications are possible. Modifications of the identification element 510 will be described below with reference to FIGS.

[0031] As shown in FIG. 6, the identification element 510 may be formed with an inwardly convex curved shape.

[0032] As shown in FIG. 7, the identification element 510 may be formed at a corner of the outer elastomer 500 .

[0033] 8, the identification element 510 may be configured as a display unit connected to the surface of the outer elastic body 500. Alternatively, the identification element 510 may be configured as a through hole formed in the center of the outer elastic body 500.

[0034] As shown in Fig. 9, the identification element 510 may be configured in a color different from the color of the inner elastic body 600. In Fig. 9, the color of the surface of the outer elastic body 500 that is different from the color of the surface of the inner elastic body 600 is indicated by hatching.

[0035] As shown in FIG. 10, the outer elastic body 500 has a protrusion that protrudes from the inner elastic body 600 in a planar view when the outer elastic body 500 and the inner elastic body 600 are superimposed, and the identification element 510 may be composed of the protrusion.

[0036] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0037] [Aspect 1] A storage stack including a plurality of storage cells; a lower case that houses the power storage stack; an upper cover that covers the electricity storage stack; an outer elastic body made of an elastic material and provided on an outer surface of the upper cover; an inner elastic body made of an elastic material and provided on the inner surface of the upper cover; The inner elastic body has a spring constant greater than a spring constant of the outer elastic body.

[0038] In this energy storage device, an outer elastic body having a relatively small spring constant is provided on the outer surface of the upper cover, thereby effectively suppressing vibration of the energy storage device relative to the vehicle when the energy storage device is mounted on the vehicle, and an inner elastic body having a relatively large spring constant is provided on the inner surface of the upper cover, thereby suppressing collision of the upper cover with the energy storage stack when a downward external force acts on the upper cover.

[0039] [Aspect 2] The power storage device of aspect 1, wherein one of the outer elastic body and the inner elastic body includes an identification element that is distinguishable from the other of the outer elastic body and the inner elastic body.

[0040] In this aspect, one elastic body can be distinguished from the other elastic body, so that incorrect placement of the outer elastic body and the inner elastic body during assembly of the electricity storage device is suppressed.

[0041] [Aspect 3] Each of the outer elastic body and the inner elastic body is formed in a rectangular parallelepiped shape having long sides and short sides in a plan view, 3. The power storage device according to aspect 2, wherein the identification element is a notch formed in a center of the long side of the one of the elastic bodies.

[0042] In this embodiment, it is possible to distinguish the material while substantially maintaining the cushioning properties.

[0043] [Aspect 4] 3. The power storage device according to aspect 2, wherein the identification element is configured in a color different from a color of the other elastic body.

[0044] [Aspect 5] Each of the outer elastic body and the inner elastic body is formed in a rectangular parallelepiped shape having long sides and short sides in a plan view, the one elastic body has a protruding portion that protrudes from the other elastic body in a plan view when the outer elastic body and the inner elastic body are overlapped, 3. The power storage device according to claim 2, wherein the identification element is formed of the protrusion.

[0045] [Aspect 6] 2. The power storage device according to aspect 1, wherein the inner elastic body is disposed at a position overlapping with the outer elastic body in a vertical direction.

[0046] [Aspect 7] The lower case is The bottom wall and a load transmitting portion that transmits a load input downward to the upper cover to the bottom wall, the load transmission portion stands upright from the bottom wall and is disposed to a side of the power storage stack, 7. The power storage device according to aspect 6, wherein the inner elastic body is disposed above the load transmitting portion.

[0047] In this aspect, a load input downward to the upper cover is received by the bottom wall via the inner elastic body and the load transmission portion, thereby suppressing damage to the electricity storage stack caused by the load.

[0048] [Aspect 8] a plate member that presses the power storage stack against the bottom wall; The plate material is arranged to straddle the power storage stack and the load transmission portion, 8. The power storage device according to aspect 7, wherein the inner elastic body is sandwiched between the upper cover and the plate material.

[0049] In this aspect, a load input downward to the upper cover is more effectively transmitted to the bottom wall.

[0050] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present disclosure is indicated by the claims, not by the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0051] 1 Energy storage device, 100 Energy storage stack, 110 Energy storage cell, 200 Lower case, 210 Bottom wall, 220 Peripheral wall, 230 Load transfer section, 300 Upper cover, 310 Top wall, 400 Plate material, 500 Outer elastic body, 501 Long side portion, 502 Short side portion, 510 Identification element, 600 Inner elastic body, 601 Long side portion, 602 Short side portion.

Claims

1. A storage stack including a plurality of storage cells; a lower case that houses the power storage stack; an upper cover that covers the electricity storage stack; an outer elastic body made of an elastic material and provided on an outer surface of the upper cover; an inner elastic body made of an elastic material and provided on the inner surface of the upper cover; The inner elastic body has a spring constant greater than a spring constant of the outer elastic body.

2. The power storage device according to claim 1 , wherein one of the outer elastic body and the inner elastic body includes an identification element that is distinguishable from the other of the outer elastic body and the inner elastic body.

3. Each of the outer elastic body and the inner elastic body is formed in a rectangular parallelepiped shape having long sides and short sides in a plan view, The power storage device according to claim 2 , wherein the identification element is configured by a notch formed in a center portion of the long side portion of the one of the elastic bodies.

4. The power storage device according to claim 2 , wherein the identification element is formed in a color different from a color of the other elastic body.

5. Each of the outer elastic body and the inner elastic body is formed in a rectangular parallelepiped shape having long sides and short sides in a plan view, the one elastic body has a protruding portion that protrudes from the other elastic body in a plan view when the outer elastic body and the inner elastic body are overlapped, The power storage device according to claim 2 , wherein the identification element is configured by the protrusion.

6. The power storage device according to claim 1 , wherein the inner elastic body is disposed at a position overlapping with the outer elastic body in the vertical direction.

7. The lower case is The bottom wall and a load transmitting portion that transmits a load input downward to the upper cover to the bottom wall, the load transmission portion stands upright from the bottom wall and is disposed to a side of the power storage stack, The power storage device according to claim 6 , wherein the inner elastic body is disposed above the load transmitting portion.

8. a plate member that presses the power storage stack against the bottom wall; The plate material is arranged to straddle the power storage stack and the load transmission portion, The power storage device according to claim 7 , wherein the inner elastic body is sandwiched between the upper cover and the plate member.

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