Electricity storage device

Abstract

The invention provides a power storage device. A power storage device is provided with: at least one power storage module; and an outer contour body that accommodates the power storage module, the outer contour body including a first plate-like member and a second plate-like member, the first plate-like member being located below the power storage module, the second plate-like member being located below the first plate-like member, the first plate-like member and the second plate-like member forming a liquid path, and the second plate-like member having a lower strength than the first plate-like member.

Description

Technical Field

[0001] The present disclosure relates to an electric storage device. Background Art

[0002] For example, in Japanese Unexamined Patent Application Publication No. 2019-197648, an electric storage device is disclosed in which an electric storage module is disposed on a cooling device for cooling the electric storage module. Summary of the Invention

[0003] In the configuration of the electric storage device disclosed in Japanese Unexamined Patent Application Publication No. 2019-197648, when an impact is generated in the cooling device and the cooling device is damaged, there is a possibility that the cooling water in the cooling device comes into contact with the electric storage module.

[0004] The present disclosure has been made in view of the above problems, and an object thereof is to provide an electric storage device that suppresses contact between the cooling water flowing in the cooling device due to damage of the cooling device when an impact is applied to the cooling device and the electric storage module in an electric storage device including the cooling device.

[0005] The electric storage device according to the present disclosure is disposed below a vehicle, and the electric storage device includes: at least one electric storage module; an outer body that houses the electric storage module; and an upper cover that covers the electric storage module. The outer body includes a first plate-like member and a second plate-like member. The first plate-like member is located below the electric storage module, and the second plate-like member is located below the first plate-like member. A liquid path is formed by the first plate-like member and the second plate-like member, and the second plate-like member has a lower strength than the first plate-like member.

[0006] The second plate-like member has a thinner plate thickness than the first plate-like member.

[0007] The second plate-like member is formed of a material having a different strength from that of the first plate-like member.

[0008] The second plate-like member is formed of a resin material, and the first plate-like member is formed of a metal.

[0009] A third plate-like member is further provided, and the third plate-like member is disposed so as to face the lower surface of the second plate-like member, and a gap is formed between the third plate-like member and the second plate-like member.

[0010] A strength member and a block are further provided. The strength member is disposed inside the outer body, and the block is disposed below the strength member and is disposed so as to abut against the second plate-like member and the third plate-like member.

[0011] The third plate-like member constitutes the lower surface of the vehicle.

[0012] The above and other objects, features, aspects, and advantages of the present invention will become more apparent from the following detailed description of the present invention understood in association with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a diagram schematically showing a vehicle 1 equipped with the power storage device 10 according to the present embodiment.

[0014] Figure 2 FIG. is a perspective view schematically showing a power storage device according to an embodiment of the present disclosure.

[0015] Figure 3 is Figure 2 exploded perspective view of the power storage device 10 shown.

[0016] Figure 4 is along Figure 2 IV-IV line in FIG. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings referred to below, the same or corresponding components are given the same reference numerals.

[0018] Figure 1 FIG. is a diagram schematically showing a vehicle 1 equipped with the power storage device 10 according to the present embodiment. The power storage device 10 is mounted, for example, below the vehicle 1 at the lower part 5. In addition, the lower part 5 of the vehicle 1 means below the floor panel 6 when the floor panel 6 is included.

[0019] In addition, in Figure 1 etc., the first direction L1 represents the longitudinal direction of the vehicle 1, and the second direction L2 represents the vehicle width direction of the vehicle 1.

[0020] Figure 2 FIG. is a perspective view schematically showing a power storage device according to an embodiment of the present disclosure. Figure 3 is Figure 2 exploded perspective view of the power storage device 10 shown.

[0021] As Figure 3 shown, the power storage device 10 includes a power storage module 100, a housing case 200, a block 300, a protection plate 400, a pressing plate 500, an outer elastic body 600, and an inner elastic body 700. The power storage module 100 is housed in the housing case 200. In addition, the protection plate 400 is an example of the "third plate-like member" of the present disclosure.

[0022] The power storage module 100 includes a plurality of power storage units 110 arranged side by side in the second direction L2. The power storage units are formed in a long shape in the first direction L1. The power storage unit 110 is, for example, a lithium ion battery.

[0023] The housing case 200 includes an upper cover 210 and an outer profile body 220. The upper cover 210 includes a top plate 211 and side walls 212. The upper cover 210 is formed to open downward. The side walls 212 are formed to extend in the first direction L1. The side walls 212 are a pair of members formed to extend downward from the sides of the top plate 211 arranged in the second direction L2.

[0024] The outer profile body 220 has an outer peripheral wall 230, a strength member 240, and a cooling plate 250. The outer peripheral wall 230 and the strength member 240 are formed to surround the four sides of the power storage module 100.

[0025] The outer peripheral wall 230 has side frames 231 and cross beams 232. The side frames 231 are formed to extend in the first direction L1. The side frames 231 are a pair of structural members arranged in the second direction L2. The upper surface of the side frames 231 is located on the same plane as the upper surface of the cross beams 232. The height of the side frames 231 is formed to be equal to the height obtained by combining the height of the power storage module 100, the cooling plate 250 to be described later, and the block 300. The end edges of the pair of side frames 231 arranged in the second direction L2 coincide with the edges arranged in the second direction L2 at the outer peripheral edge portion of the side walls 212.

[0026] The cross beams 232 are formed to extend in the second direction L2. The cross beams 232 are a pair of structural members arranged in the first direction L1. The upper surface of the cross beams 232 is located on the same plane as the upper surface of the side frames 231. The height of the cross beams 232 is formed to be equal to the height of the power storage module 100. The cross beams 232 are arranged orthogonally to the side frames 231. In addition, one of the pair of cross beams 232 is arranged to coincide with the end portion of the side frames 231 in the first direction L1, and the other cross beam 232 is arranged to coincide with the other end portion of the side frames 231 in the first direction L1. Further, a pair of EA materials (not shown) may be formed on both end faces of the pair of side frames 231 arranged in the second direction L2.

[0027] The strength member 240 is formed to extend in the first direction L1. One end face of the strength member 240 arranged in the first direction L1 is in contact with the side face of the cross beam 232, and the other end face of the strength member 240 arranged in the first direction L1 is in contact with the side face of the other cross beam 232. In addition, the strength member 240 is arranged to pass through the center in the second direction L2 of the cross beam 232. The height of the strength member 240 is formed to be consistent with the height of the cross beam 232.

[0028] Figure 4 Shows along Figure 2Cross-sectional view of the IV-IV line in []. The cooling plate 250 has a first plate-like member 251 and a second plate-like member 252. The cooling plate 250 is located directly below the strength member 240. The cooling plate 250 supports the power storage module 100 in the vertical direction.

[0029] The first plate-like member 251 is a plate formed in such a manner that its length in the first direction L1 is the same as that of the side frame 231 and its length in the second direction L2 is the same as that of the cross beam 232. The first plate-like member 251 is located directly below the cross beam 232 and the strength member 240. The cooling plate 250 supports the power storage module 100 in the vertical direction.

[0030] The second plate-like member 252 is a plate formed with an outer shape equal to that of the first plate-like member 251. The second plate-like member 252 is formed with a plurality of grooves extending in the first direction L1. Moreover, the welding portion 252a of the second plate-like member 252 is welded to the lower surface 251a of the first plate-like member 251, etc., so that a plurality of liquid paths 253 are formed between the first plate-like member 251 and the second plate-like member 252.

[0031] Here, the impact strength [kJ / m] of the second plate-like member 252 is lower than the impact strength [kJ / m] of the first plate-like member 251. In addition, the impact strength [kJ / m] includes the cantilever beam impact strength, the simply supported beam impact strength, and the tensile impact strength. Here, according to the test method of JIS K 7110, the cantilever beam impact strength is measured. According to the test method of JIS K 7111-1, the simply supported beam impact strength is measured. According to the test method of JIS K 7160, the tensile impact strength is measured. That is, when a component is damaged by applying an impact, the impact strength [kJ / m] is calculated based on the impact energy at the time of damage absorbed by the component per unit width. In addition, the impact strength is an example of the "strength" of the present disclosure.

[0032] For example, the cooling plate 250 can also be formed using aluminum. Specifically, A3003-O with a thickness of 2.5 mm and 1.2 mm can also be used. In addition, a resin material such as polyvinyl chloride can also be used to form it. In addition, the second plate-like member 252 can also be formed using a thinner plate than the first plate-like member 251. For example, the thickness t2 of the second plate-like member 252 can also be formed to be more than 1 / 3 times and less than 1 / 2 times the thickness t1 of the first plate-like member 251.

[0033] Again, refer to Figure 3, the block 300 is formed to extend in the first direction L1. The block 300 is formed in such a manner that the size in the first direction L1 thereof is the same as that of the outer peripheral wall 230 in the first direction L1. In addition, the block 300 is formed in such a manner that the size in the second direction L2 thereof is the same as that of the strength member 240 in the second direction L2. Further, the block 300 is located below the cooling plate 250, at a place overlapping with the strength member 240 in the vertical direction. The upper surface of the block 300 is in contact with the lower surface of the second plate-like member 252. The lower surface of the block 300 is located on the same plane as the lower surface of the side frame 231.

[0034] The protection plate 400 is arranged to face the lower surface of the second plate-like member 252. The protection plate 400 is formed such that the outer peripheral edge portion of the protection plate 400 coincides with the outer peripheral edge portion of the outer peripheral wall 230. The protection plate 400 is a flat plate formed on the same plane as the lower surface of the side frame 231 and the lower surface of the block 300. That is, a gap g1 corresponding to the height of the side frame 231 and the block 300 is formed between the protection plate 400 and the second plate-like member 252. In addition, the protection plate 400 constitutes the lower surface of the vehicle 1.

[0035] The gap g1 is narrower than the gap g2 formed by the top plate 211 and the pressing plate 500. An inner elastic body 700 to be described later is arranged in the gap g2. The gap g1 is narrower than the gap g3 formed by the lower part 5 of the vehicle 1 and the top plate 211. An outer elastic body 600 to be described later is arranged in the gap g3. The block 300 arranged in the gap g1 has a function of suppressing the deflection of the protection plate. Each of the elastic bodies 600 and 700 arranged in the gaps g2 and g3 has a function of suppressing the deflection of the top plate 211. In addition, the block 300 arranged in the gap g1 is less likely to deform compared with each of the elastic bodies 600 and 700. Therefore, since the block 300 can suppress deflection compared with each of the elastic bodies 600 and 700, a structure can be adopted in which the gap g1 is narrower than the gap g2 and the gap g3.

[0036] The pressing plate 500 is located on the upper surface of the outer body 220. The pressing plate 500 is arranged to straddle the power storage module 100 and the strength member 240. The pressing plate 500 presses the power storage module 100 toward the cooling plate 250. The pressing plate 500 is formed to have a size such that the outer peripheral edge portion of the pressing plate 500 is in contact with the upper surface of the outer peripheral wall 230. The pressing plate 500 is formed in a flat plate shape. The pressing plate 500 is made of a synthetic resin or the like.

[0037] Again, refer to Figure 4, the outer elastomer 600 is disposed on the upper surface of the top plate 211. The outer elastomer 600 is formed in a flat rectangular parallelepiped shape. The outer elastomer 600 is formed with a thickness t3 corresponding to the width of the gap g3. The outer elastomer 600 is made of an elastic material such as urethane. A plurality of outer elastomers 600 are arranged at intervals in the first direction L1 and the second direction L2. The outer elastomer 600 is located above the side frame 231 and the strength member 240. The outer elastomer 600 is clamped between the lower part 5 of the vehicle 1 and the top plate 211.

[0038] The inner elastomer 700 is disposed on the lower surface of the upper cover 210. The inner elastomer 700 is made of an elastic material such as urethane. The inner elastomer 700 is formed in a flat rectangular parallelepiped shape. The inner elastomer 700 is formed with a thickness t4 corresponding to the width of the gap g2. The inner elastomer 700 may also be formed in the same shape as the outer elastomer 600. A plurality of inner elastomers 700 are arranged at intervals in the first direction L1 and the second direction L2. The inner elastomer 700 is disposed below the outer elastomer 600 so as to overlap the outer elastomer 600. The inner elastomer 700 is located above the side frame 231 and the strength member 240. The inner elastomer 700 is clamped between the top plate 211 and the pressing plate 500. In addition, the thickness t4 of the inner elastomer 700 is thicker than the thickness t3 of the outer elastomer 600.

[0039] The outer elastomer 600 and the inner elastomer 700 have the function of suppressing vibration from being transmitted from the vehicle 1 to the power storage device 10 mounted on the lower part 5.

[0040] The spring constant [N / mm] of the inner elastomer 700 is greater than the spring constant [N / mm] of the outer elastomer 600. In addition, the "spring constant" includes a static spring constant and a dynamic spring constant. The measuring methods of the static spring constant and the dynamic spring constant are based on JIS K 6385. That is, the spring constant is calculated according to the relationship between the load applied to each of the elastomers 600, 700 and the deflection of each of the elastomers 600, 700 at this time.

[0041] The hardness (type C) of the inner elastomer 700 is greater than the hardness (type C) of the outer elastomer 600. The measuring method of the hardness (type C) is based on JIS K 7312. That is, the hardness is calculated according to the reaction force exerted on the indenter by the test piece when the test piece of each of the elastomers 600, 700 is pressed by the indenter.

[0042] According to an embodiment of the present disclosure, the second plate-like member 252 forming the cooling plate 250 has a lower impact strength [kJ / m] than the first plate-like member 251. Therefore, when an impact directed upward from below the vehicle acts on the cooling plate 250, the second plate-like member 252 having a lower impact strength than the first plate-like member 251 is damaged simultaneously with or prior to the first plate-like member 251. As a result, the cooling water flowing in the liquid path 253 of the damaged cooling plate 250 flows to the damaged portion of the second plate-like member 252 and flows downward due to gravity, so that it is possible to suppress the cooling water from contacting the power storage module 100.

[0043] In the above embodiment, an example in which the first plate-like member 251 (cooling plate 250) is formed of a resin material is shown, but the present disclosure is not limited thereto. For example, the first plate-like member 251 may also be formed of a metal material.

[0044] In the above embodiment, an example in which the first plate-like member 251 and the second plate-like member 252 are formed of polyvinyl chloride is shown, but the present disclosure is not limited thereto. The first plate-like member 251 and the second plate-like member 252 may also be formed of materials having different impact strengths [kJ / m2] per unit area. For example, the first plate-like member 251 may be formed of a glass fiber reinforced plastic, and the second plate-like member 252 may be formed of polyvinyl chloride.

[0045] In the above embodiment, an example in which the impact strength [kJ / m] of the second plate-like member 252 is lower than the impact strength of the first plate-like member 251 is shown, but the present disclosure is not limited thereto. For example, the breaking load [N] of the second plate-like member 252 may be smaller than the breaking load [N] of the first plate-like member 251. In addition, the breaking load [N] includes at least one of a bending breaking load [N] and a compressive breaking load [N]. Here, the bending breaking load [N] is measured according to the test method of JIS K 7171. That is, the bending breaking load [N] is obtained by pressing a indenter against a member placed on a support table to bend the member and measuring the load at which the member breaks. In addition, the compressive breaking load [N] is measured according to the test method of JIS K 7181. That is, the compressive breaking load [N] is obtained by compressing the member with a pressing plate and measuring the load at which the member breaks. In addition, the breaking load is an example of the "strength" of the present disclosure.

[0046] According to other disclosed embodiments, the second plate-like member 252 forming the cooling plate 250 has a smaller breaking load [N] than the first plate-like member 251. Therefore, when an impact from the side of the vehicle acts on the cooling plate 250 through the side frame 231, the second plate-like member 252 having a smaller breaking load than the first plate-like member 251 is broken prior to or simultaneously with the first plate-like member 251. As a result, the cooling water flowing in the liquid path 253 of the broken cooling plate 250 flows along the damaged portion of the second plate-like member 252 and gravitates downward of the vehicle, so that it is possible to suppress the cooling water from contacting the power storage module 100.

[0047] In the above embodiment, an example in which the gap g1 is narrower than the gaps g2 and g3 is shown, but the present disclosure is not limited thereto. For example, the gap g1 may be wider than either one of the gaps g2 or g3, and the gap g1 may be formed to have the same width as either one of the gaps g2 or g3.

[0048] Although the embodiments of the present invention have been described, it should be considered that the disclosed embodiments are illustrative and non-restrictive in all respects. The scope of the present invention is shown by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

Claims

1. A power storage device comprising: at least one power storage module; and An outer body, accommodating the power storage module, The outer body includes a first plate-shaped member and a second plate-shaped member, The first plate-shaped member is located below the power storage module. The second plate-shaped member is located below the first plate-shaped member. The first plate-shaped member and the second plate-shaped member form a liquid path, The second plate-shaped member has lower strength than the first plate-shaped member.

2. The power storage device according to claim 1, wherein The second plate-shaped member is thinner than the first plate-shaped member.

3. The power storage device according to claim 1, wherein The second plate-shaped member is formed of a material having a strength different from that of the first plate-shaped member.

4. The power storage device according to any one of claims 1 to 3, wherein: The second plate-shaped member is formed of a resin material, and the first plate-shaped member is formed of a metal.

5. The power storage device according to claim 1, wherein further comprising a third plate-shaped member, The third plate-shaped member is arranged to face the lower surface of the second plate-shaped member. A gap is formed between the third plate-shaped member and the second plate-shaped member.

6. The power storage device according to claim 5, wherein: It also has strength parts and blocks, The strength component is arranged in the outer frame. The block is disposed below the strength member and is disposed so as to abut against the second plate-shaped member and the third plate-shaped member.

7. The power storage device according to claim 5, wherein: The third plate-shaped member constitutes the lower surface of the vehicle.

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