Power storage device

Abstract

To provide a power storage device that prevents cooling water flowing in a cooling device from coming into contact with a power storage module if an impact is applied to the cooling device.SOLUTION: A power storage device 10 to be arranged in a lower part of a vehicle 1 includes: a plurality of power storage modules 100; an outer shell body 220 housing the power storage modules 100; and an upper cover 210 covering the power storage modules 100. The outer shell body 220 includes a first plate-like member 251 and a second plate-like member 252. The first plate-like member 251 is located below the power storage modules 100. The second plate-like 252 is located below the first plate-like member 251. The first plate-like member 251 and the second plate-like member 252 form a liquid passage 253. The second plate-like member 252 has a lower strength than the first plate-like member 251.SELECTED DRAWING: Figure 3

Description

Technical Field

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

Background Art

[0002] For example, Japanese Patent Application Laid-Open No. 2019-197648 discloses a power storage device in which a power storage module is disposed on a cooling device for cooling the power storage module.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the structure of the power storage device disclosed in Patent Document 1, when an impact is applied to the cooling device and the cooling device is damaged, there is a concern that the cooling water in the cooling device comes into contact with the power storage module.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide a power storage device that suppresses the cooling water flowing in the cooling device from coming into contact with the power storage module due to damage of the cooling device when an impact force is applied to the cooling device in a power storage device including the cooling device.

Means for Solving the Problems

[0006] The power storage device according to the present disclosure is a power storage device disposed below a vehicle. The power storage device includes at least one power storage module, an outer casing that houses the power storage module, and an upper cover that covers the power storage module. The outer casing includes a first plate-like member and a second plate-like member. The first plate-like member is located below the power 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. The second plate-like member has a lower strength than the first plate-like member. Power storage device.

[0007] The second plate-like member has a thinner plate thickness than the first plate-like member. 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 metal.

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

[0010] Further provided with a strength member and a block, the strength member is provided inside the outer casing, the block is disposed below the strength member and is disposed in the gap.

[0011] The protection plate constitutes the lower surface of the vehicle.

Effects of the Invention

[0012] According to the present disclosure, in a power storage device provided with a cooling device, when an impact force is applied to the cooling device, it is to provide a power storage device that suppresses cooling water flowing in the cooling device from coming into contact with the power storage module due to breakage of the cooling device.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

FORM FOR CARRYING OUT THE INVENTION

[0014] The Embodiment of this indication is demonstrated with reference to drawings. In the drawings which are referred below, the same number is attached | subjected to the member which is the same or corresponds to it.

[0015] FIG. 1 is a figure which shows typically vehicle 1 provided with power storage device 10 which concerns on this Embodiment. Power storage device 10 is mounted in the lower part 5 of vehicle 1, for example. In addition, the lower part 5 of vehicle 1 means the downward of floor panel 6 when it includes floor panel 6.

[0016] In addition, in FIG. 1 etc., the 1st direction L1 shows the front - back direction of vehicle 1, and the 2nd direction L2 shows the vehicle width direction of vehicle 1.

[0017] FIG. 2 is a perspective view which shows roughly the power storage device in one Embodiment of this indication. FIG. 3 is an exploded perspective view of power storage device 10 shown in FIG. 2.

[0018] As shown in FIG. 3, 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 accommodated in the housing case 200. In addition, the protection plate 400 is an example of the "3rd plate - like member" of this indication.

[0019] The power storage module 100 includes a plurality of power storage cells 110 arranged side by side in the second direction L2. The power storage cells are formed to be long in the first direction L1. The power storage cell 110 is, for example, a lithium-ion battery.

[0020] The housing case 200 includes an upper cover 210 and an outer 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 side surfaces arranged in the second direction L2 of the top plate 211.

[0021] The outer 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.

[0022] The outer peripheral wall 230 has side frames 231 and cross members 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 frame 231 is located on the same plane as the upper surface of the cross member 232. The height of the side frame 231 is formed to be equal to the sum of the heights of the power storage module 100, the cooling plate 250 to be described later, and the block 300. The end sides of the pair of side frames 231 arranged in the second direction L2 coincide with the edges arranged in the second direction L2 inside the outer peripheral edge of the side wall 212.

[0023] The cross member 232 is formed to extend in the second direction L2. The cross member 232 is a pair of structural members arranged in the first direction L1. The upper surface of the cross member 232 is located on the same plane as the upper surface of the side frame 231. The height of the cross member 232 is formed to be equal to the height of the power storage module 100. The cross member 232 is arranged to be orthogonal to the side frame 231. Also, one of the pair of cross members 232 is arranged to coincide with the end portion of the side frame 231 in the first direction L1, and the other cross member 232 is arranged to coincide with the other end portion of the side frame 231 in the first direction L1. Note that a pair of EA members (not shown) may be formed on both end surfaces of the pair of side frames 231 arranged in the second direction L2.

[0024] The strength member 240 is formed to extend in the first direction L1. One end surface of the strength member 240 arranged in the first direction L1 is in contact with the side surface of the cross member 232, and the other end surface of the strength member 240 arranged in the first direction L1 is in contact with the side surface of the other cross member 232. Also, the strength member 240 is arranged to pass through the center of the cross member 232 in the second direction L2. The height of the strength member 240 is formed to be equal to the height of the cross member 232.

[0025] Figure 4 shows a cross-sectional view taken along line IV-IV in Figure 2. 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.

[0026] The first plate-like member 251 is a plate formed to coincide with the length of the side frame 231 in the first direction L1 and the length of the cross member 232 in the second direction L2. The first plate-like member 251 is located directly below the cross member 232 and the strength member 240. The cooling plate 250 supports the power storage module 100 in the vertical direction.

[0027] The second plate-shaped member 252 is a plate formed to have the same outer shape as the first plate-shaped member 251. A plurality of groove portions extending in the first direction L1 are formed in the second plate-shaped member 252. Then, the welded portion 252a of the second plate-shaped member 252 is welded to the lower surface 251a of the first plate-shaped member 251 or the like, so that a plurality of liquid paths 253 are formed between the first plate-shaped member 251 and the second plate-shaped member 252.

[0028] Here, the impact strength [kJ / m] of the second plate-shaped member 252 is lower than the impact strength [kJ / m] of the first plate-shaped member 251. The impact strength [kJ / m] includes the Izod impact strength, the Charpy impact strength, and the tensile impact strength. Here, the Izod impact strength is measured based on the test method of JIS K 7110. The Charpy impact strength is measured based on the test method of JIS K 7111-1. The tensile impact strength is measured based on the test method of JIS K 7160. That is, the impact strength [kJ / m] is calculated based on the impact energy at the time of fracture absorbed by the member per unit width when the member is fractured by applying an impact. The impact strength is an example of the "strength" in the present disclosure.

[0029] For example, the cooling plate 250 may be formed using aluminum. Specifically, A3003-O with a thickness of 2.5 mm or 1.2 mm may be used. Alternatively, it may be formed using a resin material such as polyvinyl chloride. Further, the second plate-shaped member 252 may be formed using a plate material thinner than the first plate-shaped member 251. For example, the thickness t2 of the second plate-shaped member 252 may be formed to be not less than 1 / 3 times and not more than 1 / 2 times the thickness t1 of the first plate-shaped member 251.

[0030] Referring again to FIG. 3, the block 300 is formed to extend in the first direction L1. The block 300 is formed to match the size of the outer peripheral wall 230 in the first direction L1 in the first direction L1. Also, the block 300 is formed to match the size of the strength member 240 in the second direction L2 in the second direction L2. Note that the block 300 is located below the cooling plate 250 and is located at a place where it overlaps 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.

[0031] The protection plate 400 is disposed so as to face the lower surface of the second plate-like member 252. The protection plate 400 is formed such that the outer peripheral edge of the protection plate 400 coincides with the outer peripheral edge 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. Also, the protection plate 400 constitutes the lower surface of the vehicle 1.

[0032] 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, which will be described later, is disposed 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, which will be described later, is disposed in the gap g3. The block 300 disposed in the gap g1 has a function of suppressing the deflection of the protection plate. Each of the elastic bodies 600 and 700 disposed in the gaps g2 and g3 has a function of suppressing the deflection of the top plate 211. Note that the block 300 disposed in the gap g1 is less likely to deform than the elastic bodies 600 and 700. Therefore, since the block 300 can suppress deflection more than the elastic bodies 600 and 700, the gap g1 can be configured to be narrower than the gap g2 and the gap g3.

[0033] The pressing plate 500 is located on the upper surface of the outer housing 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 of the pressing plate 500 contacts 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.

[0034] Again, referring to FIG. 4, the outer elastic body 600 is provided on the upper surface of the top plate 211. The outer elastic body 600 is formed in a flat rectangular parallelepiped shape. The outer elastic body 600 is formed with a thickness t3 corresponding to the width of the gap g3. The outer elastic body 600 is made of an elastic material such as urethane. The plurality of outer elastic bodies 600 are arranged at intervals in the first direction L1 and the second direction L2. The outer elastic body 600 is located above the side frame 231 and the strength member 240. The outer elastic body 600 is sandwiched between the lower part 5 of the vehicle 1 and the top plate 211.

[0035] The inner elastic body 700 is provided on the lower surface of the upper cover 210. The inner elastic body 700 is made of an elastic material such as urethane. The inner elastic body 700 is formed in a flat rectangular parallelepiped shape. The inner elastic body 700 is formed with a thickness t4 corresponding to the width of the gap g2. The inner elastic body 700 may be formed in the same shape as the outer elastic body 600. The plurality of inner elastic bodies 700 are arranged at intervals in the first direction L1 and the second direction L2. The inner elastic body 700 is located below the outer elastic body 600 and overlaps with the inner elastic body 700. The inner elastic body 700 is located above the side frame 231 and the strength member 240. The inner elastic body 700 is sandwiched between the top plate 211 and the pressing plate 500. Note that the thickness t4 of the inner elastic body 700 is thicker than the thickness t3 of the outer elastic body 600.

[0036] The outer elastic body 600 and the inner elastic body 700 have a function of suppressing vibrations propagated from the vehicle 1 to the power storage device 10 mounted on the lower part 5.

[0037] The spring constant [N / mm] of the inner elastic body 700 is greater than that of the outer elastic body 600. Note that the "spring constant" includes the static spring constant and the dynamic spring constant. The measurement methods for the static spring constant and the dynamic spring constant are based on JIS K 6385. That is, the spring constant is calculated based on the relationship between the load acting on each elastic body 600, 700 and the deflection of each elastic body 600, 700 at that time.

[0038] The hardness (type C) of the inner elastic body 700 is greater than that of the outer elastic body 600. The measurement method for the hardness (type C) is based on JIS K 7312. That is, the hardness is calculated based on the reaction force acting on the indenter from the test piece when the test pieces of each elastic body 600, 700 are pressed with the indenter.

[0039] According to the 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 upward impact 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 broken simultaneously with the first plate-like member 251 or prior to 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 downward along the damaged part of the second plate-like member 252 by gravity, so that it is possible to prevent the cooling water from contacting the power storage module 100.

[0040] In the above embodiment, an example in which the first plate-like member 251 (cooling plate 250) is formed using a resin material is shown, but the present disclosure is not limited thereto. For example, the first plate-like member 251 may be formed using a metal material.

[0041] In the above-described embodiment, an example in which the first plate-like member 251 and the second plate-like member 252 are formed using polyvinyl chloride was shown, but the present disclosure is not limited thereto. The first plate-like member 251 and the second plate-like member 252 may be formed of materials having different impact strengths [kJ / m2] per unit area. For example, the first plate-like member 251 may be formed using glass fiber-reinforced plastic, and the second plate-like member 252 may be formed using polyvinyl chloride.

[0042] In the above-described 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 was 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. Note that the breaking load [N] includes at least one of the bending breaking load [N] and the compression breaking load [N]. Here, the bending breaking load [N] is measured based on 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 base to bend the member and measuring the load when the member breaks. Also, the compression breaking load [N] is measured based on the test method of JIS K 7181. That is, the compression breaking load [N] is obtained by compressing a member with a pressure plate and measuring the load when the member breaks. Note that the breaking load is an example of the "strength" in the present disclosure.

[0043] 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 breaking load smaller than that of the first plate-like member 251 is broken earlier than 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 downward of the vehicle by gravity along the damaged portion of the second plate-like member 252, so that it is possible to suppress the cooling water from coming into contact with the power storage module 100.

[0044] In the above embodiment, an example where 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 and g3, or the gap g1 may be formed to have the same width as either one of the gaps g2 and g3.

[0045] It should be noted that the embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present disclosure is shown by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope equivalent to the claims.

Explanation of Reference Numerals

[0046] 1 Vehicle, 5 Lower part, 6 Floor panel, 10 Power storage device, 100 Power storage module, 110 Power storage cell, 200 Housing case, 210 Upper cover, 211 Top plate, 212 Side wall, 220 Outer body, 230 Outer peripheral wall, 231 Side frame, 232 Cross member, 240 Strength member, 250 Cooling plate, 251 First plate-like member, 251a Lower surface, 252 Second plate-like member, 252a Welded portion, 253 Liquid path, 300 Block, 400 Protection plate, 500 Pressing plate, L1 First direction, L2 Second direction, g1, g2, g3 Gaps, t1, t2, t3, t4 Thicknesses.

Claims

1. At least one power storage module; An outer housing that houses the power storage module, and the outer housing includes a first plate-like member and a second plate-like member; The first plate-like member is located below the power storage module; 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; The second plate-like member has a lower strength than the first plate-like member. A power storage device.

2. The second plate-like member has a thinner plate thickness than the first plate-like member. The power storage device according to claim 1.

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

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

5. Further includes a third plate-like member; The third plate-like member is arranged to face the lower surface of the second plate-like member; A gap is formed between the third plate-like member and the second plate-like member. The power storage device according to claim 1.

6. Further includes a strength member and a block; The strength member is provided inside the outer housing; The block is arranged below the strength member and is arranged to abut against the second plate-like member and the third plate-like member. The power storage device according to claim 5.

7. The third plate-like member constitutes the lower surface of the vehicle. The power storage device according to claim 5. ​

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