Electricity storage device

Abstract

This power storage device is provided with: a power storage stack including a plurality of power 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 arranged on the outer surface of the upper cover; and an inner elastic body made of an elastic material and provided on the inner surface of the upper cover, the inner elastic body being disposed such that at least a portion of the inner elastic body overlaps the outer elastic body when the inner elastic body is viewed from a position separated from the arrangement direction of the outer elastic body and the inner elastic body.

Description

Technical Field

[0001] The present disclosure relates to a power storage device. Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 10-69893 discloses a battery pack including a case for accommodating batteries and a rubber sponge provided on the inner surface of an upper case of the case. Summary of the invention

[0003] When a power storage device such as that described in Japanese Patent Application Laid-Open No. 10-69893 is mounted on a vehicle, it is required to reduce vibration of the power storage device relative to the vehicle. In addition, when a downward load is input to the power storage device from above, the upper cover may contact the power storage stack.

[0004] An object of the present disclosure is to provide an electric storage device capable of suppressing both vibration of the electric storage device relative to a vehicle and contact of an upper cover with an electric storage stack.

[0005] The power storage device disclosed in the present invention comprises: a power storage stack including a plurality of power storage units; a lower shell for accommodating the power storage stack; an upper cover for covering the power storage stack; an outer elastic body composed of an elastic material and arranged on the outer surface of the upper cover; and an inner elastic body composed of an elastic material and arranged on the inner surface of the upper cover, the inner elastic body having a spring constant greater than that of the outer elastic body.

[0006] The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 1 is a diagram schematically showing a vehicle 2 including a power storage device 1 according to the present embodiment.

[0008] Figure 2 It is a perspective view schematically showing a power storage device according to one embodiment of the present disclosure.

[0009] Figure 3 yes Figure 2 An exploded perspective view of the power storage device 1 is shown.

[0010] Figure 4 yes Figure 2 The cross section along line IV-IV is shown.

[0011] Figure 5 This is a view in which the outer elastic body 500 and the inner elastic body 600 are viewed from above from a position away from the outer elastic body 500 and the inner elastic body 600 .

[0012] Figure 6 It is a top view showing a first modification example of the outer elastic body and the inner elastic body.

[0013] Figure 7 It is a top view showing a second modification example of the outer elastic body and the inner elastic body. DETAILED DESCRIPTION

[0014] The embodiments of the present disclosure will be described with reference to the accompanying drawings. In the drawings referred to below, the same or corresponding components are denoted by the same reference numerals.

[0015] Figure 1 1 is a diagram schematically showing a vehicle 2 equipped with an electric storage device 1 according to the present embodiment. The electric storage device 1 is mounted, for example, below a bottom portion 10 provided at a lower portion of the vehicle 2. In addition, the bottom portion 10 of the vehicle 2 means below the floor panel when the vehicle 2 includes a floor panel. In addition, in the case where the vehicle 2 does not include a floor panel, the bottom portion 10 means between or below longitudinal beams extending in the vehicle width direction of the vehicle 2.

[0016] In addition, Figure 1 In the figures, the first direction L1 indicates the vehicle width direction of the vehicle 2 , and the second direction L2 indicates the front-rear direction of the vehicle 2 .

[0017] Figure 2 It is a perspective view schematically showing a power storage device according to one embodiment of the present disclosure. Figure 3 yes Figure 2 An exploded perspective view of the power storage device 1 is shown.

[0018] like Figure 3 As shown, the power storage device 1 includes at least one power storage stack 100, a housing case 150, a pressure plate 400, at least one outer elastic body 500, and at least one inner elastic body 600. 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.

[0019] The plurality of power storage stacks 100 are arranged at intervals in the first direction and are arranged at intervals in the second direction L2. Each power storage stack 100 includes a plurality of power storage cells 110 arranged in the first direction.

[0020] The power storage unit 110 is formed to be elongated in the second direction L2. The power storage unit 110 is, for example, a lithium ion battery.

[0021] The housing case 150 includes an outer shell 200 and an upper cover 300. The outer shell 200 is open upward. The outer shell 200 has a bottom plate 210, a peripheral wall 220, and a partition wall 230. The outer shell 200 accommodates a plurality of power storage stacks 100. The power storage stacks 100 are accommodated so as to be surrounded on all sides by the partition walls 230 and the peripheral wall 220. In this way, the partition walls 230 are arranged on the sides of the power storage stacks 100.

[0022] The bottom plate 210 supports each power storage stack 100. The bottom plate 210 may include a cooling plate in contact with the bottom of each power storage stack 100. The peripheral wall 220 is formed to extend upward from the peripheral edge of the bottom plate 210.

[0023] 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 transmission portion" in the present disclosure.

[0024] The first partition wall 230a is formed so as to extend in the first direction L1 on the upper surface of the bottom plate 210. The first partition wall 230a is arranged so as to pass through the center of the bottom plate 210 in the second direction L2. The end surface 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 and the upper surface of the peripheral wall 220 are located on the same plane.

[0025] The plurality of second partition walls 230b are formed in a manner of standing up from the upper surface of the bottom plate 210 and extending in the second direction L2. The plurality of second partition walls 230b are arranged in a manner of dividing the bottom plate 210 into three parts in the first direction L1 by each second partition wall 230b. The end surface of one side of the second partition wall 230b arranged in the second direction L2 is joined to the peripheral wall 220, and the end surface of the other side 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.

[0026] The upper cover 300 opens downward. The outer peripheral edge of the upper cover 300 is consistent with the outer peripheral edge of the outer frame 200. The outer peripheral edge of the upper cover 300 is fixed to the outer frame 200 by bolts or the like. The upper cover 300 covers a plurality of power storage stacks 100. The upper cover 300 accommodates the power storage stacks 100 together with the outer frame 200. The upper cover 300 includes a top wall 310 located above the plurality of power storage stacks 100. The top wall 310 may be formed in a flat plate shape.

[0027] The pressing plate 400 is located on the upper surface of the peripheral wall 220 and the partition wall 230. The pressing plate 400 is arranged so as to span the plurality of power storage stacks 100 and the partition wall 230. The pressing plate 400 presses the power storage stack 100 toward the bottom plate 210. The pressing plate 400 is formed to a size such that the outer peripheral edge 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 a synthetic resin or the like.

[0028] Figure 4 yes Figure 2 The cross section at line IV-IV is shown. Figure 4 In the embodiment, each outer elastic body 500 is disposed 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 into a flat rectangular parallelepiped shape. A plurality of outer elastic bodies 500 are arranged at intervals in the first direction L1 and the second direction L2. The outer elastic body 500 is located above the peripheral wall 220 and the second partition wall 230b. The outer elastic body 500 is sandwiched between the bottom 10 and the top wall 310.

[0029] exist Figure 4 In the embodiment, 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 into a flat rectangular parallelepiped shape. The inner elastic body 600 can be formed into the same shape as the outer elastic body 500 in the plane formed by the first direction L1 and the second direction L2. A plurality of inner elastic bodies 600 are arranged at intervals in the first direction L1 and the second direction L2.

[0030] The outer elastic body 500 and the inner elastic body 600 are arranged in the up-down direction (arrangement direction). Figure 5 This is a view in which the outer elastic body 500 and the inner elastic body 600 are viewed from above from a position away from the outer elastic body 500 and the inner elastic body 600 .

[0031] exist Figure 5 In the illustrated example, the shape of the outer elastic body 500 in a plan view and the shape of the inner elastic body 600 in a plan view are substantially the same, and the outer elastic body 500 and the inner elastic body 600 overlap each other.

[0032] Back to Figure 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. In addition, the thickness t6 of the inner elastic body 600 is thicker than the thickness t5 of each outer elastic body 500.

[0033] 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. In addition, the "spring constant" 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 this time.

[0034] The hardness (type C) of each inner elastic body 600 is greater than the hardness (type C) of each outer elastic body 500. The hardness (type C) is measured in accordance with JIS K 7312. That is, the hardness is calculated based on the reaction force acting on the pressing needle from the test piece when the test piece of each elastic body 500, 600 is pressed by the pressing needle.

[0035] According to the embodiment of the present disclosure, the peripheral wall 220 and the partition wall 230 are formed on the outer body 200. The outer elastic body 500 and the inner elastic body 600 are located above the peripheral wall 220 and the partition wall 230. In addition, the outer elastic body 500 is located on the lower surface of the bottom 10 of the vehicle 2. Thus, the power storage device 1 mounted on the bottom 10 can suppress the vibration transmitted from the vehicle 2 through the outer elastic body 500 and the plurality of inner elastic bodies 600.

[0036] According to the embodiment of the present disclosure, the inner elastic body 600 having a relatively large spring constant is provided on the inner surface of the upper cover 300 . Therefore, when a downward external force acts on the top wall 310 of the upper cover 300 , the top wall 310 can be prevented from colliding with the power storage stack 100 .

[0037] According to the 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 the 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 .

[0038] According to the embodiment of the present disclosure, the pressing plate 400 is arranged across the plurality of power storage stacks 100 and the partition walls 230, so that the pressing plate 400 can press the power storage stacks 100 toward the bottom plate 210. Thus, the power storage device 1 mounted on the bottom 10 can suppress vibrations transmitted from the vehicle 2.

[0039] The above embodiment shows an example in which 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 thereto.

[0040] Figure 6 1 is a top view showing a first modification of the outer elastic body and the inner elastic body. Figure 6In the example shown, the power 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, the outer elastic body 500A is located inside the inner elastic body 600A.

[0041] Thus, the inner elastic body 600A is formed larger than the outer elastic body 500A in a plan view. That is, 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.

[0042] The above embodiment shows an example in which the outer elastic body 500 and the inner elastic body 600 overlap each other so that their centers coincide with each other in the plane formed by the first direction L1 and the second direction L2 , but the present disclosure is not limited thereto.

[0043] Figure 7 2 is a top view showing a second modification of the outer elastic body and the inner elastic body. Figure 7 In the illustrated example, the power storage device includes an outer elastic body 500B and an inner elastic body 600B.

[0044] When the outer elastic body 500B and the inner elastic body 600B are viewed from above, the inner elastic body 600B may be arranged so that at least a portion of the inner elastic body 600B overlaps with the outer elastic body 500B.

[0045] The above embodiment shows an example in which 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 thereto. For example, the outer elastic body 500 may also be located above the first partition wall 230a. The same is true for the inner elastic body 600.

[0046] Moreover, if Figure 7 As shown, the outer elastic body 500B may be located at a position overlapping at least a portion of the second partition wall 230b in the vertical direction. The same applies to the positional relationship between the outer elastic body 500B and the peripheral wall 220 in the vertical direction.

[0047] Furthermore, the inner elastic body 600B may also be located at a position overlapping at least a portion of the second partition wall 230b in the vertical direction. The same applies to the vertical positional relationship between the inner elastic body 600B and the peripheral wall 220.

[0048] The above embodiment shows an example in which the thickness t6 of the inner elastic body 600 is thicker than the thickness t5 of each outer elastic body 500 , but the present disclosure is not limited thereto. For example, the thickness t6 of each inner elastic body 600 may be less than the thickness t5 of each outer elastic body 500 .

[0049] Although the embodiments of the present invention have been described, the embodiments disclosed this time should be considered to be illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the claims, and it is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A power storage device comprising: A power storage stack including a plurality of power storage units; a housing shell that houses the power storage stack and includes an upper cover that covers the power storage stack; an outer elastic body, made of elastic material and disposed on the outer surface of the upper cover; and The inner elastic body is made of elastic material and is arranged on the inner surface of the upper cover. 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 arranged 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, 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, The inner elastic body is thicker than the outer elastic body.

4. The power storage device according to claim 1 or 2, The power storage device is arranged below a bottom portion provided at a lower portion of the vehicle. The outer elastic body is sandwiched by the upper cover and the bottom.

5. The power storage device according to claim 4, The receiving shell has: Base plate; and The load transfer part transfers the load input downward to the upper cover to the bottom plate, The load transmission portion stands upright from the bottom plate and is arranged on the side of the power storage stack. The inner elastic body is located above the load transmitting portion.

6. The power storage device according to claim 5, The power storage device further includes a pressing plate for pressing the power storage stack toward the bottom plate. The pressure plate is arranged so as to straddle the power storage stack and the load transmission unit. The inner elastic body is sandwiched by the upper cover and the pressure plate.

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