Battery case and battery

Abstract

The present application relates to the technical field of batteries, and discloses a battery case and a battery. The battery case comprises: a main body, provided with pole holes; pole assemblies, running through the pole holes; first insulating parts, arranged between the main body and the pole assemblies; and sealing rings, arranged corresponding to the pole holes, wherein the sealing rings are compressed between the main body and the pole assemblies and / or between the first insulating parts and the pole assemblies; the range of a first overlap amount x of a first insulating part and the corresponding sealing ring is 0.3 mm to 0.6 mm, and / or the range of a second overlap amount y of the main body and a sealing ring is from 0.5 mm to 1.0 mm. The present application ensures the sealing performance and the insulation performance of the battery case, reduces the cost of the sealing rings, reduces the overall weight of the battery case, and achieves the goal of battery weight reduction.

Description

Battery casing and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 7, 2023, with application number 202311670353.8 and invention name “Battery Casing and Battery”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery casing and a battery. Background Art

[0004] With the continuous development of the battery industry, lithium-ion batteries, due to their high energy density, are widely used in vehicles, mobile devices and other fields. Among them, the battery casing is an important component to ensure battery safety, and the sealing ring in the battery casing plays a vital role in its sealing and insulation. For example, the battery casing usually includes a battery top cover, which mainly includes a terminal-sealing ring-plain aluminum sheet-explosion-proof valve-lower plastic-upper plastic. The existing battery top cover achieves a seal between the terminal and the plain aluminum sheet by compressing the sealing ring. Therefore, the coordination requirements between the sealing ring, the terminal, the plain aluminum sheet and other structures are extremely important. Summary of the Invention

[0005] In view of this, the present application provides a battery housing and a battery to solve the problem in the prior art that the matching relationship between the sealing ring and other components in the battery housing is not defined, resulting in the inability to ensure the sealing performance of the battery housing.

[0006] In the first aspect, the present application provides a battery casing, comprising: a main body, having a pole hole; a pole assembly, arranged through the pole hole; a first insulating member, arranged between the main body and the pole assembly; a sealing ring, arranged corresponding to the pole hole, the sealing ring being compressed and arranged between the main body and the pole assembly and / or between the first insulating member and the pole assembly; the first overlap amount x between the first insulating member and the sealing ring is in the range of 0.3 mm to 0.6 mm, and / or the second overlap amount y between the main body and the sealing ring is in the range of 0.5 mm to 1.0 mm.

[0007] Beneficial effects: While ensuring the sealing and insulation performance of the battery casing, the cost of the sealing ring is reduced, the overall weight of the battery casing is reduced, and the goal of lightweighting the battery is achieved.

[0008] In an optional embodiment, the sealing ring overlaps with the first insulating member and the main body at the same time, and the second overlap amount y is greater than or equal to the first overlap amount x.

[0009] Beneficial effect: The overlapping and compression effects of the main body on the sealing ring are better than the overlapping and compression effects of the first insulating member on the sealing ring. Therefore, the sealing performance of the battery casing mainly depends on the overlapping and compression of the main body on the sealing ring. By making y≥x, the overlapping effect of the main body on the sealing ring is guaranteed, thereby improving the sealing performance.

[0010] In an optional embodiment, the first compression amount m of the sealing ring by the first insulating member ranges from 0.2 mm to 0.5 mm; and / or the second compression amount n of the sealing ring by the main body ranges from 0.33 mm to 0.66 mm; and / or the main body includes a shell and / or a cover plate, and the pole hole is opened on the shell and / or the cover plate.

[0011] In an optional embodiment, a first compression rate α of the first insulating member to the sealing ring ranges from 8% to 20%; and / or a second compression rate β of the main body to the sealing ring ranges from 30% to 60%.

[0012] Beneficial effects: While ensuring the sealing and insulation properties of the battery casing, the cost of the sealing ring is reduced, the plastic strength of the sealing ring is ensured, the overall weight of the battery casing is reduced, and the goal of lightweighting the battery is achieved.

[0013] In an optional embodiment, the pole assembly includes a pole body, the pole body is arranged to pass through the pole hole, and the first insulating member is provided with a first through hole allowing the pole body to pass through.

[0014] Beneficial effect: By providing the first insulating member, the insulation performance between the pole body and the main body is ensured.

[0015] In an optional embodiment, the battery casing further comprises a second insulating member, the second insulating member being provided with a second through hole allowing the pole body to pass through, the second insulating member being arranged between the lower surface of the main body and the pole body; and / or the sealing ring is a multi-layer structure, one layer of the sealing ring located on the upper layer is arranged corresponding to the first insulating member, and the other layer of the sealing ring located on the lower layer is arranged corresponding to the main body; the outer diameter of the upper layer of the sealing ring is A, the outer diameter of the lower layer of the sealing ring is B, and the diameter of the pole body corresponding to the sealing ring is O; the first overlap rate X between the first insulating member and the upper layer of the sealing ring is x / (A / 2-O / 2), and the range of the first overlap rate X is 37.5% to 75%; the second overlap rate Y between the main body and the lower layer of the sealing ring is y / (B / 2-O / 2), and the range of the second overlap rate Y is 33.3% to 66.6%.

[0016] Beneficial effect: By providing the second insulating member, the insulation performance between the main body and the pole body is ensured.

[0017] In an optional embodiment, the hole wall of the first through hole is arranged close to the pole body relative to the hole wall of the pole hole, so that the first insulating member extends out of the main body toward the pole body, and the portion of the first insulating member extending out of the main body presses the sealing ring; and / or, the hole wall of the pole hole is arranged close to the pole body relative to the hole wall of the second through hole, so that the main body extends out of the second insulating member toward the pole body, and the portion of the main body extending out of the second insulating member presses the sealing ring.

[0018] Beneficial effect: The sealing ring is pressed simultaneously by the extended portion of the first insulating member and the extended portion of the main body, so that the sealing ring is compressed and deformed, thereby ensuring the sealing of the battery shell.

[0019] In an optional embodiment, the aperture of the first through hole is a, the aperture of the pole hole is b, and x=A / 2-a / 2, y=B / 2-b / 2.

[0020] In an optional embodiment, the upper layer height of the sealing ring is C, the lower layer height of the sealing ring is D, the distance from the lower surface of the first insulating part to the lower surface of the sealing ring is c, and the distance from the lower surface of the main body to the lower surface of the sealing ring is d, satisfying m=Cc, n=Dd, α=m / C, β=n / D.

[0021] In a second aspect, the present application also provides a battery, comprising the above-mentioned battery casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] FIG1 is a schematic diagram of the overall structure of a battery top cover according to an embodiment of the present application;

[0024] FIG2 is a cross-sectional view of the battery top cover at the terminal assembly shown in FIG1 ;

[0025] FIG3 is a schematic diagram of a first overlap and a second overlap of the battery top cover in FIG2 ;

[0026] FIG4 is a schematic diagram of the outer diameter of the upper layer of the sealing ring of the battery top cover, the outer diameter of the lower layer of the sealing ring, the diameter of the terminal body, the aperture of the first through hole, and the aperture of the terminal hole in FIG2;

[0027] FIG5 is a schematic diagram of a first compression amount and a second compression amount of the battery top cover in FIG2 ;

[0028] FIG6 is a schematic diagram illustrating the upper height of the sealing ring of the battery top cover, the lower height of the sealing ring, the distance from the lower surface of the first insulating member to the lower surface of the sealing ring, and the distance from the lower surface of the cover plate to the lower surface of the sealing ring in FIG2 ;

[0029] FIG7 is a cross-sectional view of another battery top cover at the pole assembly according to an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1. Main body; 101. Pole hole; 2. Pole assembly; 201. Pole body; 202. Rivet block; 3. First insulating member; 301. First through-hole; 4. Sealing ring; 5. Second insulating member; 501. Second through-hole. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0033] The following describes an embodiment of the present application with reference to FIG. 1 to FIG. 7 .

[0034] According to an embodiment of the present application, on the one hand, a battery housing is provided, comprising a main body 1, a pole assembly 2, a first insulating member 3 and a sealing ring 4. The main body 1 is provided with a pole hole 101, the pole assembly 2 is arranged through the pole hole 101, and the first insulating member 3 is arranged between the main body 1 and the pole assembly 2. The sealing ring 4 is arranged corresponding to the pole hole 101, and the sealing ring 4 is compressed and arranged between the main body 1 and the pole assembly 2 and / or between the first insulating member 3 and the pole assembly 2. The first overlap amount x between the first insulating member 3 and the sealing ring 4 is in the range of 0.3 mm to 0.6 mm, and / or the second overlap amount y between the main body 1 and the sealing ring 4 is in the range of 0.5 mm to 1.0 mm.

[0035] The battery shell of this embodiment can reduce the cost of the sealing ring 4 and the overall weight of the battery shell while ensuring the sealing and insulating properties of the battery shell, thereby achieving the goal of lightweighting the battery. Specifically, when x is less than 0.3mm and y is less than 0.5mm, and the values ​​of x and y are too small, the overlap between the sealing ring 4 and the first insulating member 3 and the main body 1 will be affected, resulting in reduced sealing and insulation between the sealing ring 4 and the first insulating member 3 and the main body 1, affecting the sealing and insulating properties of the battery shell; when x is greater than 0.6mm and y is greater than 1.0mm, the values ​​of x and y are too large, which increases the cost of the sealing ring 4 and increases the weight of the battery shell, which does not meet the goal of lightweighting the overall battery structure.

[0036] Optionally, the value of the first overlap amount x is 0.4. Of course, in other alternative embodiments, the value of x can also be 0.3, 0.38, 0.39, 0.41, 0.42, 0.43, 0.5, 0.6, etc.

[0037] Optionally, the value of the second overlap amount y is 0.75. Of course, in other alternative embodiments, the value of y can also be 0.5, 0.6, 0.73, 0.74, 0.76, 0.77, 0.8, 0.9, 1.0, etc.

[0038] In one embodiment, the sealing ring 4 overlaps both the first insulating member 3 and the main body 1, and the second overlap amount y is greater than or equal to the first overlap amount x. The overlapping and compression effect of the main body 1 on the sealing ring 4 is superior to the overlapping and compression effect of the first insulating member 3 on the sealing ring 4. Therefore, the sealing performance of the battery housing is mainly achieved by the overlapping and compression of the main body 1 on the sealing ring 4. By ensuring that y ≥ x, the overlapping effect of the main body 1 on the sealing ring 4 is ensured, thereby improving the sealing performance.

[0039] It should be noted that the main body 1 is typically made of a metal alloy (for example, the cover is a plain aluminum plate), such as an aluminum alloy; and the first insulating member 3 is made of a plastic material, such as polypropylene (PP). Plastic materials are softer than metal alloys. When the pole assembly 2 is riveted to the main body 1, the main body 1 has high strength and hardness, providing a better overlap and sealing effect on the sealing ring 4.

[0040] In one embodiment, as shown in FIG5 , the first compression amount m of the first insulating member 3 on the sealing ring 4 ranges from 0.2 mm to 0.5 mm, and / or the second compression amount n of the main body 1 on the sealing ring 4 ranges from 0.33 mm to 0.66 mm.

[0041] In one embodiment, the first compression ratio α of the first insulating member 3 to the sealing ring 4 ranges from 8% to 20%, and / or the second compression ratio β of the main body 1 to the sealing ring 4 ranges from 30% to 60%.

[0042] The battery shell of this embodiment is applied to reduce the cost of the sealing ring 4, ensure the plastic strength of the sealing ring 4, reduce the overall weight of the battery shell, and achieve the goal of lightweighting the battery. Specifically, when m < 0.2 mm, n < 0.33 mm, α < 8%, β < 30%, and the values ​​of m, n, α, and β are too small, it will affect the compression amount and compression rate of the first insulating member 3 and the main body 1 on the sealing ring 4, thereby affecting the sealing performance and insulation performance of the sealing ring 4 on the battery shell; when m > 0.5 mm, n > 0.66 mm, α > 20%, β > 60%, the values ​​of m, n, α, and β are too large, which increases the cost of the sealing ring 4 and increases the weight of the battery shell, which does not meet the lightweight goal of the overall battery structure. In addition, the increase in compression amount and compression rate will cause permanent deformation of the sealing ring 4 and reduce the plastic strength.

[0043] Optionally, the value of the first compression amount m is 0.3. Of course, in other alternative embodiments, the value of m can also be 0.2, 0.25, 0.29, 0.31, 0.32, 0.35, 0.4, 0.45, 0.5, etc.

[0044] Optionally, the value of the second compression amount n is 0.45. Of course, in other alternative embodiments, the value of n can also be 0.33, 0.35, 0.4, 0.41, 0.46, 0.47, 0.49, 0.5, 0.55, 0.6, 0.66, etc.

[0045] Optionally, the first compression ratio α is set to 12%. Of course, in other alternative embodiments, the value of α may also be 8%, 10%, 11.8%, 11.93%, 12.3%, 12.7%, 13.1%, 14%, 16%, 17%, 18%, 19%, 20%, etc.

[0046] Optionally, the second compression ratio β is 40%. Of course, in other alternative embodiments, the value of β can also be 30%, 31%, 35%, 36%, 37.96%, 40.41%, 41.96%, 42.73%, 43.36%, 45%, 50%, 54%, 60%, etc.

[0047] In one embodiment, as shown in Figures 2 and 7, the pole assembly 2 includes a pole body 201, which is disposed through the pole hole 101. The first insulating member 3 is provided with a first through hole 301 that allows the pole body 201 to pass through. The first insulating member 3 ensures insulation performance between the pole body 201 and the main body 1.

[0048] It is worth noting that, in one embodiment, as shown in Figure 2, the pole assembly 2 further includes a rivet block 202, which is spaced apart from the upper surface of the main body 1 and connected to the outer periphery of the pole body 201, and the first insulating member 3 is arranged between the rivet block 202 and the upper surface of the main body 1.

[0049] In one embodiment, as shown in Figures 2 and 7, the battery housing further includes a second insulating member 5, which has a second through-hole 501 formed therein to allow the terminal body 201 to pass therethrough. The second insulating member 5 is disposed between the lower surface of the main body 1 and the terminal body 201. The provision of the second insulating member 5 ensures insulation performance between the main body 1 and the terminal body 201.

[0050] In one embodiment, as shown in Figures 2 and 7, the wall of the first through-hole 301 is positioned closer to the pole body 201 relative to the wall of the pole hole 101, so that the first insulating member 3 extends out of the main body 1 toward the pole body 201. The portion of the first insulating member 3 extending out of the main body 1 presses against the sealing ring 4. The wall of the pole hole 101 is positioned closer to the pole body 201 relative to the wall of the second through-hole 501, so that the second insulating member 5 extends out of the main body 1 toward the pole body 201. The portion of the main body 1 extending out of the second insulating member 5 presses against the sealing ring 4. The extended portions of the first insulating member 3 and the main body 1 simultaneously press against the sealing ring 4, causing compression and deformation of the sealing ring 4, thereby ensuring the sealing of the battery housing.

[0051] In one embodiment, as shown in Figures 2 to 7 , the sealing ring 4 has a double-layer structure, with the upper layer of the sealing ring 4 corresponding to the first insulating member 3, and the lower layer of the sealing ring 4 corresponding to the main body 1. Specifically, the first insulating member 3 presses the upper layer of the sealing ring 4, and the main body 1 presses the lower layer of the sealing ring 4.

[0052] It is worth noting that, as shown in Figure 4, the outer diameter of the upper layer of the sealing ring 4 is A, the outer diameter of the lower layer of the sealing ring 4 is B, the aperture of the first through hole 301 is a, and the aperture of the terminal hole 101 is b. Therefore, x = A / 2 - a / 2, y = B / 2 - b / 2.

[0053] In one embodiment, the diameter of the pole body 201 corresponding to the sealing ring 4 is O. The first overlap ratio X between the first insulating member 3 and the upper layer of the sealing ring 4 is x / (A / 2-O / 2), and the first overlap ratio X ranges from 37.5% to 75%. The second overlap ratio Y between the main body 1 and the lower layer of the sealing ring 4 is y / (B / 2-O / 2), and the second overlap ratio Y ranges from 33.3% to 66.6%.

[0054] It should be noted that the remaining space between the first insulating member 3 and the upper layer of the sealing ring 4, and the remaining space between the main body 1 and the lower layer of the sealing ring 4, namely (1-X) and (1-Y), serves as the deformation space for the sealing ring 4. Specifically, referring to Figure 2 , when the first insulating member 3 compresses the upper layer of the sealing ring 4, the upper layer of the sealing ring 4 is squeezed and deformed into the space between the first insulating member 3 and the terminal body 201; when the main body 1 compresses the lower layer of the sealing ring 4, the lower layer of the sealing ring 4 is squeezed and deformed into the space between the main body 1 and the terminal body 201.

[0055] It is worth noting that the value of the first overlap rate X can be 37.5%, 40%, 42%, 45%, 47%, 50%, 53%, 55%, 58%, 60%, 62%, 65%, 68%, 70%, 71%, 73%, 75%, etc.

[0056] It is worth noting that the value of the second overlap rate Y can be 33.3%, 36%, 38%, 41%, 45%, 48%, 50%, 51%, 54%, 55%, 57%, 60%, 62%, 65%, 66.6%, etc.

[0057] It is worth noting that, as shown in Figure 6, the upper height of the sealing ring 4 (i.e., the distance from the upper surface of the sealing ring 4 to the lower surface of the sealing ring 4) is C, the lower height of the sealing ring 4 (i.e., the distance from the lower surface of the sealing ring 4 to the lower surface of the sealing ring 4) is D, the distance from the lower surface of the first insulating member 3 to the lower surface of the sealing ring 4 is c, and the distance from the lower surface of the main body 1 to the lower surface of the sealing ring 4 is d. Therefore, m = Cc, n = Dd, α = m / C, and β = n / D.

[0058] Of course, in other alternative embodiments, the sealing ring 4 may also be a multi-layer structure, with one layer located on the upper layer of the multi-layer structure corresponding to the first insulating member 3 , and another layer located on the lower layer of the multi-layer structure corresponding to the main body 1 .

[0059] In one embodiment, the main body includes a housing and a cover plate. As shown in Figures 1 to 7, the terminal hole 101 is opened on the cover plate. That is, the terminal assembly 2, the first insulating member 3, the sealing ring 4, and the second insulating member 5 are all arranged corresponding to the cover plate, thereby forming a battery top cover.

[0060] Of course, in other alternative embodiments, the pole hole 101 may also be provided corresponding to the housing.

[0061] Different battery top covers were subjected to helium testing and penetrant testing. The experimental results are shown in Tables 1 and 2.

[0062] As can be seen from Table 1, in Examples 01 to 14, the value of the first overlap amount x is in the range of 0.3 mm to 0.6 mm, the value of the second overlap amount y is in the range of 0.5 mm to 1.0 mm, the value of the first overlap ratio X is in the range of 37.5% to 75%, the value of the second overlap ratio Y is in the range of 33.3% to 66.6%, the value of the first compression amount m is in the range of 0.2 mm to 0.5 mm, the value of the second compression amount n is in the range of 0.33 mm to 0.66 mm, the value of the first compression ratio α is in the range of 8% to 20%, and the value of the second compression ratio β is in the range of 30% to 60%. Therefore, the battery top covers of Examples 01 to 14 can all pass the helium test and the penetrant test.

[0063] As can be seen from Table 2, in Comparative Example 1, the first overlap amount x is 0.1 mm, which is not in the range of 0.3 mm to 0.6 mm, and is less than 0.3 mm; the second overlap amount y is 0.2 mm, which is not in the range of 0.5 mm to 1.0 mm, and is less than 0.5 mm; the first overlap ratio X is 12.5%, which is not in the range of 37.5% to 75%, and is less than 37.5%; the second overlap ratio Y is 13.3%, which is not in the range of 33.3% to 66.6%, and is less than 33.3%; therefore, the values ​​of x, y, X, and Y are too small, and the helium test and the penetrant test fail. In addition, after the battery top cover is disassembled, the deformation of the compressed part of the sealing ring 4 can be restored.

[0064] In Comparative Example 2, the first compression amount m is 0.1 mm, which is not in the range of 0.2 mm to 0.5 mm, and is less than 0.2 mm; the second compression amount n is 0.25 mm, which is not in the range of 0.33 mm to 0.66 mm, and is less than 0.33 mm; the first compression rate α is 4%, which is not in the range of 8% to 20%, and is less than 8%; the second compression rate β is 20%, which is not in the range of 30% to 60%, and is less than 30%; therefore, the values ​​of m, n, α and β are too small, and the helium test and the penetrant test fail. Moreover, after the battery top cover is disassembled, the deformation of the compressed part of the sealing ring 4 can be restored.

[0065] In Comparative Example 3, the first overlap amount x is 0.1 mm, which is not within the range of 0.3 mm to 0.6 mm and is less than 0.3 mm; the second overlap amount y is 0.2 mm, which is not within the range of 0.5 mm to 1.0 mm and is less than 0.5 mm; the first overlap ratio X is 12.5%, which is not within the range of 37.5% to 75% and is less than 37.5%; the second overlap ratio Y is 13.3%, which is not within the range of 33.3% to 66.6% and is less than 33.3%; therefore, the values ​​of x, y, X, and Y are too small, and the helium test and penetrant test fail. Moreover, after the battery top cover is disassembled, the deformation at the compression portion of the sealing ring 4 can be restored.

[0066] In Comparative Example 4, the first compression amount m is 0.1 mm, which is not in the range of 0.2 mm to 0.5 mm, and is less than 0.2 mm; the second compression amount n is 0.25 mm, which is not in the range of 0.33 mm to 0.66 mm, and is less than 0.33 mm; the first compression rate α is 4%, which is not in the range of 8% to 20%, and is less than 8%; the second compression rate β is 20%, which is not in the range of 30% to 60%, and is less than 30%; therefore, the values ​​of m, n, α and β are too small, and the helium test and the penetrant test fail. Moreover, after the battery top cover is disassembled, the deformation of the compressed part of the sealing ring 4 can be restored.

[0067] In Comparative Example 5, the first overlap amount x is 0.2 mm, which is not within the range of 0.3 mm to 0.6 mm, and is less than 0.3 mm; the second overlap amount y is 0.4 mm, which is not within the range of 0.5 mm to 1.0 mm, and is less than 0.5 mm; the first overlap ratio X is 25%, which is not within the range of 37.5% to 75%, and is less than 37.5%; the second overlap ratio Y is 26.7%, which is not within the range of 33.3% to 66.6%, and is less than 33.3%; the first compression amount m is 0.15 mm, which is not within the range of 0.2 mm. The second compression amount n is 0.2 mm, which is not in the range of 0.33 mm to 0.66 mm, and is less than 0.33 mm; the first compression rate α is 6%, which is not in the range of 8% to 20%, and is less than 8%; the second compression rate β is 16%, which is not in the range of 30% to 60%, and is less than 30%; therefore, the values ​​of x, y, X, Y, m, n, α and β are too small, and the helium test and the penetrant test fail. Moreover, after the battery top cover is disassembled, the deformation of the compressed part of the sealing ring 4 can be restored.

[0068] In Comparative Example 6, the first overlap amount x is 0.8 mm, which is not within the range of 0.3 mm to 0.6 mm and is greater than 0.6 mm; the second overlap amount y is 1.2 mm, which is not within the range of 0.5 mm to 1.0 mm and is greater than 1.0 mm; the first overlap ratio X is 81.3%, which is not within the range of 37.5% to 75% and is greater than 75%; the second overlap ratio Y is 80%, which is not within the range of 33.3% to 66.6% and is greater than 66.6%; therefore, the values ​​of x, y, X, and Y are too large. Although both the helium test and the penetrant test are passed, after the battery top cover is disassembled, the deformation at the compression point of the sealing ring 4 cannot be restored, the plastic strength is reduced, and the sealing ring 4 is heavy, which will result in a heavier battery top cover.

[0069] In Comparative Example 7, the first compression amount m is 0.8 mm, which is not in the range of 0.2 mm to 0.5 mm, and is greater than 0.5 mm; the second compression amount n is 1.2 mm, which is not in the range of 0.33 mm to 0.66 mm, and is greater than 0.66 mm; the first compression rate α is 40%, which is not in the range of 8% to 20%, and is greater than 20%; the second compression rate β is 75%, which is not in the range of 30% to 60%, and is greater than 60%; therefore, the values ​​of m, n, α and β are too large. Although both the helium test and the penetrant test are passed, after the battery top cover is disassembled, the deformation of the compressed part of the sealing ring 4 cannot be restored, the plastic strength is reduced, and the sealing ring 4 is heavy, which will cause the battery top cover to be heavy.

[0070] In Comparative Example 8, the first overlap amount x is 0.7 mm, which is not within the range of 0.3 mm to 0.6 mm and is greater than 0.6 mm; the second overlap amount y is 1.1 mm, which is not within the range of 0.5 mm to 1.0 mm and is greater than 1.0 mm; the first overlap ratio X is 87.7%, which is not within the range of 37.5% to 75%, and is greater than 75%; the second overlap ratio Y is 73.3%, which is not within the range of 33.3% to 66.6%, and is greater than 66.6%; the first compression amount m is 0.8 mm, which is not within the range of 0.2 mm to 0.5 mm and is greater than 0.5 mm. m; the second compression amount n is 1.2mm, which is not within the range of 0.33mm to 0.66mm, and is greater than 0.66mm; the first compression rate α is 40%, which is not within the range of 8% to 20%, and is greater than 20%; the second compression rate β is 75%, which is not within the range of 30% to 60%, and is greater than 60%; therefore, the values ​​of x, y, X, Y, m, n, α and β are too large. Although both the helium test and the penetrant test are passed, after the battery top cover is disassembled, the deformation of the compressed part of the sealing ring 4 cannot be restored, the plastic strength is reduced, and the sealing ring 4 is heavy, which will cause the battery top cover to be heavy. It should be noted that the helium test refers to the use of a helium mass spectrometer to detect the airtightness of the battery top cover. The test requirements are that the pole assembly 2 of the battery top cover is under an air pressure of 1.2MPa for 30s from the inside to the outside and from the outside to the inside. The actual leakage rate of the helium test is less than 1×10 -7 Pa·m 3 / s meets the sealing requirements.

[0071] It should be noted that the penetrant test procedure is cleaning-penetration-development. Specifically, use a detergent to clean all stains on the battery cover surface. After the battery cover surface is dry for 5 to 10 minutes, apply the penetrant. The nozzle is 20 to 30 mm away from the battery cover surface. The penetration time is generally 5 to 15 minutes. Keep the battery cover surface fully moistened with the penetrant. After thoroughly shaking the developer, spray it evenly at a distance of 300 mm. After spraying the developer, disassemble the battery cover for observation. If no penetrant residue is found on the four sealing rings, it means that the penetrant test has passed.

[0072] It should be noted that in the comparative example in the above embodiments, the theoretical design value of A is 11.1 mm, the theoretical design value of B is 13.0 mm, the theoretical design value of a is 10.3 mm, the theoretical design value of b is 11.5 mm, the theoretical design value of C is 2.45 mm, the theoretical design value of D is 1.1 mm, the theoretical design value of c is 2.15 mm, and the theoretical design value of d is 0.65 mm.

[0073] It is worth noting that the battery housing can be a square battery housing, or a blade battery housing, etc.

[0074] Table 1 Experimental results of the embodiment (unit: mm)

[0075] Table 2 Comparative Example Test Results (Unit: mm)

[0076] According to an embodiment of the present application, in another aspect, a battery is provided, comprising the battery housing described above, and further comprising a battery cell, the battery cell being located within the battery housing and electrically connected to the electrode assembly 2 .

[0077] It is worth noting that the battery can be a power battery or an energy storage battery.

[0078] It is worth noting that the battery can be a square battery or a blade battery, etc.

[0079] According to an embodiment of the present application, on another aspect, a battery module is provided, comprising the above-mentioned battery.

[0080] According to an embodiment of the present application, on another aspect, a battery pack is provided, comprising the above-mentioned battery module.

[0081] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery casing, characterized in that: include: The main body is provided with a pole hole; A pole assembly is arranged through the pole hole, and the pole assembly includes a pole body; A first insulating member, disposed between the main body and the pole assembly; A sealing ring is arranged corresponding to the pole hole, and the sealing ring is compressed and arranged between the main body and the pole assembly and between the first insulating member and the pole assembly; the first overlap amount x of the first insulating member and the sealing ring is in the range of 0.3mm to 0.6mm, and the second overlap amount y of the main body and the sealing ring is in the range of 0.5mm to 1.0mm; the first compression amount m of the sealing ring by the first insulating member is in the range of 0.2mm to 0.5mm, and the second compression amount n of the sealing ring by the main body is in the range of 0.33mm to 0.66mm; the first insulating member is in the range of 0.2mm to 0.5mm The first compression rate α of the sealing ring ranges from 8% to 20%, and the second compression rate β of the main body to the sealing ring ranges from 30% to 60%; the outer diameter of the upper layer of the sealing ring is A, the outer diameter of the lower layer of the sealing ring is B, and the diameter of the pole body corresponding to the sealing ring is O; the first overlap rate X=x / (A / 2-O / 2) between the first insulating member and the upper layer of the sealing ring, and the first overlap rate X ranges from 37.5% to 75%; the second overlap rate Y=y / (B / 2-O / 2) between the main body and the lower layer of the sealing ring, and the second overlap rate Y ranges from 33.3% to 66.6%.

2. The battery housing according to claim 1, characterized in that: The sealing ring overlaps with the first insulating member and the main body at the same time, and the second overlap amount y is greater than or equal to the first overlap amount x.

3. The battery casing according to claim 1 or 2, characterized in that: The main body includes a shell and / or a cover plate, and the pole hole is opened in the shell and / or the cover plate.

4. The battery case according to claim 1 or 2, characterized in that: The pole body is disposed through the pole hole, and the first insulating member is provided with a first through hole allowing the pole body to pass through.

5. The battery housing according to claim 4, characterized in that: The battery housing further comprises a second insulating member, the second insulating member is provided with a second through hole allowing the pole body to pass through, and the second insulating member is arranged between the lower surface of the main body and the pole body; and / or, The sealing ring has a structure of several layers, one layer of the sealing ring located at the upper layer is arranged corresponding to the first insulating member, and another layer of the sealing ring located at the lower layer is arranged corresponding to the main body.

6. The battery housing according to claim 5, characterized in that: The hole wall of the first through hole is arranged close to the pole body relative to the hole wall of the pole hole, so that the first insulating member extends out of the main body toward the pole body, and the portion of the first insulating member extending out of the main body presses the sealing ring; and / or, the hole wall of the pole hole is arranged close to the pole body relative to the hole wall of the second through hole, so that the main body extends out of the second insulating member toward the pole body, and the portion of the main body extending out of the second insulating member presses the sealing ring.

7. The battery housing according to claim 5, characterized in that: The aperture of the first through hole is a, and the aperture of the pole hole is b, satisfying x=A / 2-a / 2, y=B / 2-b / 2.

8. The battery casing according to claim 7, characterized in that: The upper layer height of the sealing ring is C, the lower layer height of the sealing ring is D, the distance from the lower surface of the first insulating part to the lower surface of the sealing ring is c, and the distance from the lower surface of the main body to the lower surface of the sealing ring is d, satisfying m=Cc, n=Dd, α=m / C, β=n / D.

9. A battery, characterized in that: A battery casing comprising the battery casing according to any one of claims 1 to 8.

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