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; an accommodation case 150 accommodating the power storage stack 100; an upper cover 300 covering the power storage stack 100; an outside elastic body 500 made of an elastic material and provided on an outer surface of the upper cover 300; and an inside elastic body 600 made of an elastic material and provided on an inner surface of the upper cover 300. The inside elastic body 600 is disposed in a position where at least part of the inside elastic body overlaps with the outside elastic body 500 in a vertical direction.SELECTED DRAWING: Figure 4

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] The energy storage device according to the present disclosure comprises an 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 the 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] FIG. 1 is a diagram that illustrates a vehicle 2 equipped with an electricity storage device 1 according to the present embodiment. [Diagram 2] 1 is a perspective view illustrating a schematic configuration of an electricity storage device according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is an exploded perspective view of the electricity storage device 1 shown in FIG. [Figure 4] This is a cross section taken along line IV-IV shown in FIG. [Diagram 5] 1 is a plan view of the outer elastic body 500 and the inner elastic body 600 viewed from a position above and away from the outer elastic body 500 and the inner elastic body 600. FIG. [Figure 6] FIG. 13 is a plan view showing a first modified example of the outer elastic body and the inner elastic body. [Figure 7] FIG. 13 is a plan view showing a second modified example of the outer elastic body and the inner 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] 1 is a diagram that shows a schematic diagram of a vehicle 2 equipped with an electricity storage device 1 according to the present embodiment. The electricity storage device 1 is mounted, for example, below a bottom 10 provided on the lower part of the vehicle 2. Note that, in cases where the vehicle 2 includes a floor panel, the bottom 10 of the vehicle 2 means below the floor panel. Also, in cases where the vehicle 2 does not include a floor panel, the bottom 10 means between or below side members extending in the vehicle width direction of the vehicle 2.

[0011] 1 and the like, a first direction L1 indicates a vehicle width direction of the vehicle 2, and a second direction L2 indicates a front-rear direction of the vehicle 2.

[0012] Fig. 2 is a perspective view that shows a schematic configuration of a power storage device according to an embodiment of the present disclosure, and Fig. 3 is an exploded perspective view of the power storage device 1 shown in Fig. 2.

[0013] 3, the energy storage device 1 includes at least one energy storage stack 100, a housing case 150, a pressing plate 400, at least one outer elastic body 500, and at least one inner elastic body 600. In this embodiment, the energy storage device 1 includes six energy storage stacks 100. However, the number of energy storage stacks 100 is not limited to six.

[0014] The multiple power storage stacks 100 are arranged at intervals in a first direction and arranged at intervals in a second direction L2. Each power storage stack 100 includes multiple power storage cells 110 arranged side by side in the first direction.

[0015] The storage cell 110 is formed long in the second direction L2. The storage cell 110 is, for example, a lithium ion battery.

[0016] The housing case 150 includes an outer shell 200 and an upper cover 300. The outer shell 200 opens upward. The outer shell 200 has a bottom plate 210, a peripheral wall 220, and a partition wall 230. The outer shell 200 houses a plurality of power storage stacks 100. The power storage stacks 100 are housed so as to be surrounded on all four sides by the partition walls 230 and the peripheral wall 220. In this manner, the partition wall 230 is disposed on the side of the power storage stack 100.

[0017] The bottom plate 210 supports each of the power storage stacks 100. The bottom plate 210 may include a cooling plate that contacts the bottom of each of the power storage stacks 100. The peripheral wall 220 is formed to extend upward from the peripheral edge of the bottom plate 210.

[0018] The partition wall 230 is formed of a first partition wall 230a and a plurality of second partition walls 230b. The partition wall 230 is an example of a "load transfer portion" in the present disclosure.

[0019] The first partition wall 230a is formed on the upper surface of the bottom plate 210 so as to extend in the first direction L1. The first partition wall 230a is disposed so as to pass through the center of the bottom plate 210 in the second direction L2. An end face of the first partition wall 230a arranged in the first direction L1 is joined to the peripheral wall 220. The upper surface of the first partition wall 230a is located on the same plane as the upper surface of the peripheral wall 220.

[0020] The second partition walls 230b are formed to stand up from the upper surface of the bottom plate 210 and extend in the second direction L2. The second partition walls 230b are arranged to divide the bottom plate 210 into three in the first direction L1. One end surface of the second partition wall 230b arranged in the second direction L2 is joined to the peripheral wall 220, and the other end surface of the second partition wall 230b arranged in the second direction L2 is joined to the first partition wall 230a. The upper surface of the second partition wall 230b is located on the same plane as the upper surface of the peripheral wall 220.

[0021] The upper cover 300 is open downward. An outer peripheral edge of the upper cover 300 and an outer peripheral edge of the outer shell 200 are aligned. The outer peripheral edge of the upper cover 300 is fixed to the outer shell 200 by bolts or the like. The upper cover 300 covers the multiple power storage stacks 100. The upper cover 300 houses the power storage stacks 100 together with the outer shell 200. The upper cover 300 includes a top wall 310 located above the multiple power storage stacks 100. The top wall 310 may be formed in a flat plate shape.

[0022] The pressing plate 400 is located on the peripheral wall 220 and the upper surface of the partition wall 230. The pressing plate 400 is arranged so as to straddle the multiple power storage stacks 100 and the partition wall 230. The pressing plate 400 presses the power storage stacks 100 towards the bottom plate 210. The pressing plate 400 is formed to a size such that the outer circumferential edge portion of the pressing plate contacts the upper surface of the peripheral wall 220. The pressing plate 400 is formed in a flat plate shape. The pressing plate 400 is made of synthetic resin or the like.

[0023] 4 is a cross section taken along line IV-IV in FIG. 2. In FIG. 4, each outer elastic body 500 is provided on the upper surface of the top wall 310. 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 outer elastic bodies 500 are arranged at intervals in the first direction L1 and the second direction L2. The outer elastic bodies 500 are located above the peripheral wall 220 and the second partition wall 230b. The outer elastic bodies 500 are sandwiched between the bottom 10 and the top wall 310.

[0024] In Fig. 4, each inner elastic body 600 is provided on the lower 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. The inner elastic body 600 may be formed in the same shape as the outer elastic body 500 in a plane formed by the first direction L1 and the second direction L2. The multiple inner elastic bodies 600 are arranged at intervals in the first direction L1 and the second direction L2.

[0025] The outer elastic body 500 and the inner elastic body 600 are arranged in the up-down direction (arrangement direction). Fig. 5 is a plan view of the outer elastic body 500 and the inner elastic body 600 from a position above and away from the outer elastic body 500 and the inner elastic body 600.

[0026] In the example shown in FIG. 5, the shape of the outer elastic body 500 when viewed in a plane is substantially the same as the shape of the inner elastic body 600 when viewed in a plane, and the outer elastic body 500 and the inner elastic body 600 overlap each other.

[0027] 4, the inner elastic body 600 is located above the peripheral wall 220 and the second partition wall 230b. The inner elastic body 600 is sandwiched between the top wall 310 of the upper cover 300 and the pressing plate 400. The thickness t6 of the inner elastic body 600 is greater than the thickness t5 of each outer elastic body 500.

[0028] 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.

[0029] 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.

[0030] According to the embodiment of the present disclosure, the outer shell 200 is formed with a peripheral wall 220 and a partition wall 230. The outer elastic body 500 and the inner elastic body 600 are located above the peripheral wall 220 and the partition wall 230. Furthermore, the outer elastic body 500 is located on the lower surface of the bottom 10 of the vehicle 2. As a result, the outer elastic body 500 and the multiple inner elastic bodies 600 can suppress vibrations propagated from the vehicle 2 to the power storage device 1 mounted on the bottom 10.

[0031] According to an embodiment of the present disclosure, an inner elastic body 600 having a relatively large spring constant is provided on the inner surface of the upper cover 300, so that when a downward external force acts on the top wall 310 of the upper cover 300, it is possible to prevent the top wall 310 from colliding with the energy storage stack 100.

[0032] According to an embodiment of the present disclosure, the partition wall 230 is formed to extend upward from the upper surface of the bottom plate 210, so that a load input downward to the upper cover 300 can be transmitted to the bottom plate 210 through the outer elastic body 500 and the inner elastic body 600.

[0033] According to the embodiment of the present disclosure, the pressing plate 400 is disposed so as to straddle the plurality of power storage stacks 100 and the partition wall 230, and therefore the pressing plate 400 can press the power storage stacks 100 against the bottom plate 210. This makes it possible to suppress vibrations transmitted from the vehicle 2 to the power storage device 1 mounted on the bottom portion 10.

[0034] In the above embodiment, the inner elastic body 600 is formed in the same shape as the outer elastic body 500 in the plane formed by the first direction L1 and the second direction L2, but the present disclosure is not limited to this.

[0035] Fig. 6 is a plan view showing a first modified example of the outer elastic body and the inner elastic body. In the example shown in Fig. 6, the electricity storage device includes an outer elastic body 500A and an inner elastic body 600A. When the outer elastic body 500A and the inner elastic body 600A are viewed from above in a plan view, the outer elastic body 500A is located within the inner elastic body 600A.

[0036] In this way, the inner elastic body 600A is formed to be larger than the outer elastic body 500A when viewed in a plane. In other words, the inner elastic body 600 may be formed in a shape different from that of the outer elastic body 500 in the plane formed by the first direction L1 and the second direction L2.

[0037] In the above embodiment, the outer elastic body 500 and the inner elastic body 600 overlap with each other so that their centers coincide in the plane formed by the first direction L1 and the second direction L2, but the present disclosure is not limited to this.

[0038] Fig. 7 is a plan view showing a second modified example of the outer elastic body and the inner elastic body. In the example shown in Fig. 7, the electricity storage device includes an outer elastic body 500B and an inner elastic body 600B.

[0039] When the outer elastic body 500B and the inner elastic body 600B are viewed in plan from a position spaced above, the inner elastic body 600B may be disposed so as to at least partially overlap the outer elastic body 500B.

[0040] In the above embodiment, the outer elastic body 500 is located above the peripheral wall 220 and the second partition wall 230b, but the present disclosure is not limited to this. For example, the outer elastic body 500 may be located above the first partition wall 230a. The same applies to the inner elastic body 600.

[0041] 7, the outer elastic body 500B may be positioned so as to overlap at least a portion of the second partition wall 230b in the up-down direction. The same applies to the positional relationship between the outer elastic body 500B and the peripheral wall 220 in the up-down direction.

[0042] Similarly, the inner elastic body 600B may be positioned so as to overlap at least a portion of the second partition wall 230b in the up-down direction. The same applies to the positional relationship between the inner elastic body 600B and the peripheral wall 220 in the up-down direction.

[0043] In the above embodiment, the thickness t6 of the inner elastic body 600 is greater than the thickness t5 of each outer elastic body 500, but the present disclosure is not limited to this. For example, 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.

[0044] 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]

[0045] 1 Energy storage device, 2 vehicle, 10 bottom, 100 Energy storage stack, 110 Energy storage cell, 150 storage case, 200 outer shell, 210 bottom plate, 220 peripheral wall, 230 partition wall, 230a first partition wall, 230b second partition wall, 300 upper cover, 310 top wall, 400 retaining plate, 500, 500A, 500B outer elastic body, 600, 600A, 600B inner elastic body, L1 first direction, L2 second direction, t5, t6 thickness.

Claims

1. A storage stack including a plurality of storage cells; a housing case that houses the power storage stack and includes an upper cover that covers the power 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; Equipped with An energy storage device, wherein when the inner elastic body is viewed from a position away from the arrangement direction of the outer elastic body and the inner elastic body, the inner elastic body is positioned so that at least a portion of the inner elastic body overlaps with the outer elastic body.

2. The power storage device according to claim 1 , wherein the inner elastic body has a spring constant greater than a spring constant of the outer elastic body.

3. The power storage device according to claim 1 or 2, wherein a thickness of the inner elastic body is greater than a thickness of the outer elastic body.

4. The power storage device is disposed under a bottom portion provided under a vehicle, The power storage device according to claim 1 or 2, wherein the outer elastic body is sandwiched between the upper cover and the bottom portion.

5. The storage case includes: The bottom plate and a load transmission portion that transmits a load input downward to the upper cover to the bottom plate, the load transmission portion stands upright from the bottom plate and is disposed to a side of the power storage stack, The power storage device according to claim 4 , wherein the inner elastic body is positioned above the load transmitting portion.

6. A pressing plate is further provided to press the power storage stack against the bottom plate, The pressing plate is disposed so as to straddle the power storage stack and the load transmission portion, The power storage device according to claim 5 , wherein the inner elastic body is sandwiched between the upper cover and the pressing plate.

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