Battery shell and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell body and a cover plate, the shell body comprises two oppositely arranged first wall surfaces and two oppositely arranged second wall surfaces, the cover plate comprises a sealing platform and a plugging boss, the sealing platform is used for sealing the shell body, and the plugging boss is used for plugging the shell body. The length size of the inserting boss in the first direction is a, the distance size between the two opposite first wall faces is c, and a-c is larger than or equal to 0.05 mm and smaller than or equal to 0.1 mm. According to the invention, the plugging boss is arranged, and the length dimension a of the plugging boss along the first direction is greater than the distance dimension c between the two opposite first wall surfaces, so that the contact area between the cover plate and the shell body is increased, interference fit is realized, the frictional resistance is improved, the cover plate is prevented from being bounced off when the cover plate and the shell body are assembled, and the service life of the cover plate is prolonged. Therefore, certain steps and gaps exist between the cover plate and the shell body, the process yield is improved, and the sealing effect after welding is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery casing and a battery. Background Art

[0002] Lithium-ion batteries are currently widely used in various fields such as transportation power supply, power energy storage power supply, new energy storage power supply, aerospace and military industry, etc. due to their large capacity, high operating voltage, strong charge retention ability, and long cycle life. The structure of a single lithium battery generally includes a pole group, an electrolyte, a cover plate, a shell, and internal and external insulation structures. The cover plate and the shell are usually fixed by laser welding to form a closed space that protects the pole group with a certain structural strength.

[0003] At present, in order to improve the energy density of the whole battery pack, the single cell is gradually developing towards a "blade" structure. The cross-section of the cell is very small, resulting in a smaller and smaller overlap surface between the cover and the shell. At the same time, in order to ensure the insulation effect, a ceramic coating is added to the positive ear of the electrode group, which increases the overall hardness of the ear. As a result, after the cover is installed into the shell, on the one hand, due to the small overlap area between the shell and the cover, on the other hand, due to the high hardness of the ear after adding the ceramic coating, the rebound force after bending is large, so that after the cover is installed in the shell, it is easy to pop out of the shell, resulting in a certain step and gap between the cover and the shell, which seriously affects the process yield and the sealing effect after the cover and the shell are welded. Summary of the invention

[0004] The object of the present invention is to provide a battery casing and a battery with high process yield and good welding sealing performance.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In one aspect, a battery housing is provided, the battery housing comprising:

[0007] A shell body, wherein a cavity is provided in the shell body and comprises two first walls arranged opposite to each other along a first direction and two second walls arranged opposite to each other along a second direction;

[0008] A cover plate, the cover plate comprising a closed platform and an inserting boss, the inserting boss is arranged on a side of the closed platform facing the cavity and inserted into the cavity, and the closed platform is used to close the shell body;

[0009] The length dimension of the plug-in boss along the first direction is a, the spacing dimension between two opposite first wall surfaces along the first direction is c, and 0.05mm≤ac≤0.1mm is satisfied.

[0010] Optionally, a width dimension of the plug-in boss along the second direction is b, a spacing dimension between two opposite second wall surfaces along the second direction is d, and 0.05 mm ≤ db ≤ 0.1 mm is satisfied.

[0011] Optionally, a height dimension of the plug-in boss along the third direction is h1, and satisfies 0.75mm≤h1≤2.25mm.

[0012] Optionally, a height dimension of the closed platform along the third direction is h2, and satisfies 1.5 mm ≤ h1 + h2 ≤ 3 mm.

[0013] Optionally, the first wall surface is transitionally connected to the adjacent second wall surface via an arc edge, the arc edge includes a first arc segment and a second arc segment, the first arc segment is arranged on a side of the second arc segment close to the cover plate, the radius dimension of the first arc segment is R1, the radius dimension of the second arc segment is R2, and 0.015mm≤(R1-R2)≤0.025mm is satisfied.

[0014] Optionally, a height dimension of the first arc segment along the third direction is e, and satisfies 3mm≤e≤5mm.

[0015] Optionally, the plug-in boss includes two first surfaces arranged opposite to each other along the first direction and two second surfaces arranged opposite to each other along the second direction, and the first surface is transitionally connected to the adjacent second surface via an arc angle, and the arc angle is accommodated in the first arc segment.

[0016] Optionally, the thickness of two opposite first walls along the first direction is t1, the thickness of two opposite second walls along the second direction is t2, and 0.3 mm ≤ t1 = t2 ≤ 0.8 mm is satisfied.

[0017] Optionally, the battery casing further includes an explosion-proof valve, two opposite first walls and two opposite second walls, any one of the four walls is provided with the explosion-proof valve, the thickness dimension of the wall provided with the explosion-proof valve is n1, and satisfies 1mm≤n1≤1.2mm, and the thickness dimensions of the remaining three walls not provided with the explosion-proof valve are all n2, and satisfy 0.5mm≤n2≤0.6mm.

[0018] On the other hand, a battery is provided, comprising a pole group and a battery casing as described in any one of the above items, wherein the pole group is disposed in the battery casing.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a battery shell, which increases the contact area between the cover plate and the shell body by arranging an insertion boss inserted into the cavity of the shell body on a closed platform of the cover plate, thereby increasing the friction resistance between the cover plate and the shell body, and limiting the relationship between the length dimension a of the insertion boss along a first direction and the spacing dimension c between two opposite first wall surfaces so that the two satisfy 0.05mm≤ac≤0.1mm, thereby ensuring that the length dimension a of the insertion boss along the first direction is greater than the spacing dimension c between the two opposite first wall surfaces, thereby forming an interference fit, so that On the basis of increasing the contact area between the cover plate and the shell body and improving the friction resistance by using the plug-in boss, the friction resistance can be further increased to avoid the cover plate being bounced off when assembled with the shell body, resulting in a certain step and gap between the cover plate and the shell body, thereby improving the process yield and improving the sealing effect after welding. On the other hand, by limiting the difference between the length dimension a of the plug-in boss along the first direction and the spacing dimension c between the two opposite first wall surfaces, it is possible to avoid the difference being too small, resulting in insufficient interference, resulting in the further increased friction resistance failing to achieve the expected effect, and also to avoid the difference being too large, resulting in excessive interference, resulting in increased difficulty in assembly.

[0021] The present invention also provides a battery, which, by applying the above-mentioned battery shell, avoids the cover plate being ejected when assembling the cover plate and the shell body, resulting in gaps and steps, thereby improving the sealing of the battery after assembly, avoiding the problem of electrolyte leakage, and improving the product quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a partial three-dimensional structure of the outer shell body of the battery shell provided by the present invention;

[0023] Figure 2 yes Figure 1 A magnified view of the structure of part A;

[0024] Figure 3 It is a schematic plan view of a shell body of a battery shell with a medium wall thickness structure provided by the present invention;

[0025] Figure 4 It is a schematic plan view of a shell body of a battery shell with unequal wall thickness provided by the present invention;

[0026] Figure 5 It is a schematic diagram of a partial three-dimensional structure of a cover plate in a battery housing provided by the present invention;

[0027] Figure 6 It is a partial front view of the cover plate in the battery housing provided by the present invention;

[0028] Figure 7 It is a top view of the cover plate in the battery housing provided by the present invention.

[0029] In the figure:

[0030] 1. Shell body; 11. First wall surface; 12. Second wall surface; 13. Arc edge; 131. First arc segment; 132. Second arc segment;

[0031] 2. Cover plate; 21. Enclosed platform; 22. Insertion boss; 221. First surface; 222. Second surface; 223. Arc angle. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] As the joint surface between the cover plate and the shell is getting smaller and smaller, and the hardness of the tab is higher after adding the ceramic coating, the cover plate is easily ejected from the shell after being installed into the shell, resulting in a certain step and gap between the cover plate and the shell, thus affecting the process yield and the sealing effect after the cover plate and the shell are welded.

[0037] Therefore, in order to prevent the cover plate from being ejected from the shell body after assembly, eliminate the steps and gaps between the cover plate and the shell, improve the process yield and improve the sealing effect after welding, this embodiment provides a battery shell.

[0038] like Figures 1 to 7 As shown, the battery shell includes a shell body 1 and a cover plate 2. The shell body 1 is provided with a cavity and includes two first walls 11 arranged opposite to each other along a first direction and two second walls 12 arranged opposite to each other along a second direction. The cover plate 2 includes a closed platform 21 and an inserting boss 22. The inserting boss 22 is arranged on the side of the closed platform 21 facing the cavity and is inserted in the cavity. The closed platform 21 is used to close the shell body 1. The length dimension of the inserting boss 22 along the first direction is a, and the spacing dimension between the two opposite first walls 11 along the first direction is c, and 0.05mm≤ac≤0.1mm is satisfied.

[0039] The battery shell is provided with an insertion boss 22 inserted into the cavity of the shell body 1 on the closed platform 21 of the cover plate 2, and the insertion boss 22 is inserted into the shell body 1 to increase the contact area between the cover plate 2 and the shell body 1, thereby increasing the friction resistance between the cover plate 2 and the shell body 1, and by limiting the relationship between the length dimension a of the insertion boss 22 along the first direction and the spacing dimension c between the two opposite first wall surfaces 11, so that the two satisfy 0.05mm≤ac≤0.1mm, thereby ensuring that the length dimension a of the insertion boss 22 along the first direction is greater than the spacing dimension c between the two opposite first wall surfaces 11, thereby forming an interference fit, so that in On the basis of increasing the contact area between the cover plate 2 and the shell body 1 and improving the friction resistance by utilizing the plug-in boss 22, the friction resistance is further improved to prevent the cover plate 2 from being bounced off when assembled with the shell body 1, resulting in a certain step and gap between the cover plate 2 and the shell body 1, thereby improving the process yield and improving the sealing effect after welding. On the other hand, by limiting the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first wall surfaces 11, it is avoided that the difference is too small, resulting in insufficient interference, resulting in the further improved friction resistance failing to achieve the expected effect, and it is also avoided that the difference is too large, resulting in excessive interference, resulting in increased difficulty in assembly.

[0040] The battery shell provided by the present invention can be suitable for different types of batteries, such as blade batteries or square shell batteries. When adapted to blade batteries, the shell body 1 is composed of only two oppositely arranged first walls 11 and two oppositely arranged second walls 12, and forms a hollow shell structure with double-sided openness. When adapted to square shell batteries, the shell body 1, in addition to the two oppositely arranged first walls 11 and the two oppositely arranged second walls 12, is also provided with a bottom wall, and forms a hollow shell structure with one side open. In this embodiment, the battery shell is adapted to blade batteries.

[0041] In this embodiment, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 can be any value between 0.05 mm and 0.1 mm or a range between any two values, for example, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc.

[0042] Alternatively, if Figure 3 , Figure 7 As shown, the width dimension of the plug-in boss 22 along the second direction is b, and the spacing dimension between the two opposite second walls 12 along the second direction is d, and 0.05mm≤db≤0.1mm is satisfied. By setting the width dimension of the plug-in boss 22 along the second direction to b, the spacing dimension between the two opposite second walls 12 to d, and limiting the difference between the two so that the difference between the two satisfies 0.05mm≤db≤0.1mm, the width of the plug-in boss 22 along the second direction is smaller than the spacing between the two second walls 12, so that the plug-in boss 22 forms a clearance fit with the shell body 1 in the width of the second direction, avoiding the plug-in boss 22 from having an interference fit with the shell body 1 in both the length in the first direction and the width in the second direction, which leads to great difficulty in assembly. Therefore, when ensuring that the length of the plug-in boss 22 along the first direction is interference fit with the shell body 1, the width of the plug-in boss 22 along the second direction is clearance fit with the shell body 1, thereby reducing the difficulty of assembly. In addition, by limiting the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12, the difference between the two satisfies 0.05mm≤db≤0.1mm, thereby avoiding on the one hand the difference being too small, which would lead to assembly difficulties, and on the other hand the difference being too large, which would affect the sealing after assembly.

[0043] In this embodiment, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 can be any value between 0.05 mm and 0.1 mm or a range between any two values, for example, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc.

[0044] Alternatively, if Figure 6 As shown, the height dimension of the plug-in boss 22 along the third direction is h1, and satisfies 0.75mm≤h1≤2.25mm. By setting the height dimension of the plug-in boss 22 along the third direction to h1, and making it satisfy 0.75mm≤h1≤2.25mm, on the one hand, it is prevented that the height dimension h1 of the plug-in boss 22 is too small, resulting in insufficient contact area between the cover plate 2 and the shell body 1 after plugging, resulting in small friction resistance between the two, and on the other hand, it is prevented that the height dimension h1 of the plug-in boss 22 is too large, resulting in occupying a larger space inside the shell body 1, resulting in compression of the pole group volume and reduced energy density.

[0045] In this embodiment, the height dimension h1 of the plug-in boss 22 along the third direction can be any value between 0.75 mm and 2.25 mm or a range between any two values, for example, 0.75 mm, 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.25 mm, etc.

[0046] Alternatively, if Figure 6 As shown, the height dimension of the closed platform 21 along the third direction is h2, and satisfies 1.5mm≤h1+h2≤3mm. By setting the height dimension of the closed platform 21 along the third direction to h2, and limiting the sum of the height dimension h2 of the closed platform 21 along the third direction and the height dimension h1 of the plug-in boss 22 along the third direction, so that the sum of the two satisfies 1.5mm≤h1+h2≤3mm, the height dimension h2 of the closed platform 21 along the third direction can be reversed according to the height dimension h1 of the plug-in boss 22 along the third direction, thereby ensuring that the closed platform 21 has sufficient thickness, on the one hand, avoiding deformation when the closed platform 21 and the shell body 1 are overlapped, and on the other hand, providing sufficient welding area when welding the cover plate 2 and the shell body 1, ensuring the structural strength after welding.

[0047] In this embodiment, the sum of the height dimension h2 of the closed platform 21 along the third direction and the height dimension h1 of the plug-in boss 22 along the third direction can be any value between 1.5 mm and 3 mm or a range between any two values, for example, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0048] Alternatively, if Figure 3 , Figure 4As shown, the first wall surface 11 and the adjacent second wall surface 12 are transitionally connected via an arc edge 13. The arc edge 13 includes a first arc segment 131 and a second arc segment 132. The first arc segment 131 is arranged on a side of the second arc segment 132 close to the cover plate 2. The radius dimension of the first arc segment 131 is R1, and the radius dimension of the second arc segment 132 is R2, and 0.015mm≤R1-R2≤0.025mm is satisfied. By adopting the arc edge 13 to transitionally connect the first wall surface 11 and the adjacent second wall surface 12, the stress concentration phenomenon that occurs when the first wall surface 11 and the second wall surface 12 are connected at a right angle is avoided, thereby improving the reliability of the structure. In addition, by setting the radius size of the first arc segment 131 of the arc edge 13 to R1, setting the radius size of the second arc segment 132 of the arc edge 13 to R2, and making both satisfy 0.015mm≤R1-R2≤0.025mm, on the one hand, it is avoided that the gap between the inner wall of the first arc segment 131 and the plug-in boss 22 is too small, which increases the difficulty of assembly. On the other hand, it is avoided that after the arc edge 13 opens the first arc segment 131, the remaining material thickness is too small, which weakens the structural strength of the shell body 1 and reduces the protective performance of the shell body 1.

[0049] In this embodiment, the difference between the radius dimension R1 of the first arc segment 131 and the radius dimension R2 of the second arc segment 132 can be any value between 0.015mm and 0.025mm or a range between any two values, for example, 0.015mm, 0.016mm, 0.017mm, 0.018mm, 0.019mm, 0.02mm, 0.021mm, 0.022mm, 0.023mm, 0.024mm, 0.025mm, etc.

[0050] Furthermore, if Figure 2 As shown, the height dimension of the first arc segment 131 along the third direction is e, and satisfies 3mm≤e≤5mm. By limiting the height dimension of the first arc segment 131 along the third direction to e, and making it satisfy 3mm≤e≤5mm, on the one hand, it is avoided that the height dimension e of the first arc segment 131 along the third direction is too small, resulting in failure to fully cover the four corners of the plug-in boss 22 inserted into the shell body 1 in height, and on the other hand, it is avoided that the height dimension of the first arc segment 131 along the third direction is too large, resulting in weakening the structural strength of the shell body 1 and reducing the protective performance of the shell body 1.

[0051] In this embodiment, in order to confirm the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12, the height dimension e of the first arc segment 131 along the third direction, and the height dimension h1 of the plug-in boss 22 along the third direction, the influence of the cover plate 2 inserted into the shell body 1, and the influence on the welding sealing of the cover plate 2 and the shell body 1 after assembly, as shown in Table 1, six groups of embodiments and ten groups of comparative examples are provided for verification.

[0052] The verification method is to assemble the cover plate 2 and the shell body 1, observe whether the shell body 1 is damaged after assembly, and record the shell entry yield rate. If the shell entry yield rate is greater than 99.9%, the product quality is qualified; if the shell entry yield rate is less than 99.9%, the product quality is unqualified. After the assembly of the cover plate 2 and the shell body 1 is completed, welding is performed, and the helium detection test is used to measure the welding sealing performance. If the welding sealing performance product airtightness yield rate is greater than 99.9%, the product is qualified; if the welding sealing performance product airtightness yield rate is less than 99.9%, the product is unqualified.

[0053] Table 1

[0054]

[0055] In Example 1, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.05 mm, satisfying the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.06 mm, satisfying the range of 0.05 mm ≤ db ≤ 0.1 mm, and the height dimension e of the first arc segment 131 along the third direction is set to 4 mm, satisfying 3 mm ≤ e ≤ 5 mm. m, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, the shell entry is smooth, and no damage to the shell body 1 is found. The shell entry yield is 99.92%>99.9%, which meets the shell entry requirements. After the assembly is completed, the cover plate 2 and the shell body 1 are welded, and a helium inspection test is carried out. The helium inspection test is qualified, and the airtightness yield of the welded product is 99.93%>99.9%, which meets the sealing requirements and the product is qualified.

[0056] In Example 2, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.08 mm, satisfying the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.06 mm, satisfying the range of 0.05 mm ≤ db ≤ 0.1 mm, and the height dimension e of the first arc segment 131 along the third direction is set to 4 mm, satisfying 3 mm ≤ e ≤ 5 mm. m, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, the shell entry is smooth, and no damage to the shell body 1 is found. The shell entry yield is 99.91%>99.9%, which meets the shell entry requirements. After the assembly is completed, the cover plate 2 and the shell body 1 are welded, and a helium inspection test is carried out. The helium inspection test is qualified, and the airtightness yield of the welded product is 99.94%>99.9%, which meets the sealing requirements and the product is qualified.

[0057] In Example 3, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.06 mm, satisfying the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.05 mm, satisfying the range of 0.05 mm ≤ db ≤ 0.1 mm, and the height dimension e of the first arc segment 131 along the third direction is set to 4 mm, satisfying 3 mm ≤ e ≤ 5 mm. m, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, the shell entry is smooth, and no damage to the shell body 1 is found. The shell entry yield is 99.94%>99.9%, which meets the shell entry requirements. After the assembly is completed, the cover plate 2 and the shell body 1 are welded, and a helium inspection test is carried out. The helium inspection test is qualified, and the airtightness yield of the welded product is 99.91%>99.9%, which meets the sealing requirements and the product is qualified.

[0058] In Example 4, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.06 mm, satisfying the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.07 mm, satisfying the range of 0.05 mm ≤ db ≤ 0.1 mm, and the height dimension e of the first arc segment 131 along the third direction is set to 4 mm, satisfying the range of 3 mm ≤ e ≤ 5 mm. m, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, the shell entry is smooth, and no damage to the shell body 1 is found. The shell entry yield is 99.92%>99.9%, which meets the shell entry requirements. After the assembly is completed, the cover plate 2 and the shell body 1 are welded, and a helium inspection test is carried out. The helium inspection test is qualified, and the airtightness yield of the welded product is 99.908%>99.9%, which meets the sealing requirements and the product is qualified.

[0059] In Example 5, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.06 mm, satisfying the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.06 mm, satisfying the range of 0.05 mm ≤ db ≤ 0.1 mm, and the height dimension e of the first arc segment 131 along the third direction is set to 3 mm, satisfying 3 mm ≤ e ≤ 5 mm. m, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, the shell entry is smooth, and no damage to the shell body 1 is found. The shell entry yield is 99.91%>99.9%, which meets the shell entry requirements. After the assembly is completed, the cover plate 2 and the shell body 1 are welded, and a helium inspection test is carried out. The helium inspection test is qualified, and the airtightness yield of the welded product is 99.92%>99.9%, which meets the sealing requirements and the product is qualified.

[0060] In Example 6, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.06 mm, satisfying the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.06 mm, satisfying the range of 0.05 mm ≤ db ≤ 0.1 mm, and the height dimension e of the first arc segment 131 along the third direction is set to 5 mm, satisfying 3 mm ≤ e ≤ 5 mm. m, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, the shell entry is smooth, and no damage to the shell body 1 is found. The shell entry yield is 99.93%>99.9%, which meets the shell entry requirements. After the assembly is completed, the cover plate 2 and the shell body 1 are welded, and a helium inspection test is carried out. The helium inspection test is qualified, and the airtightness yield of the welded product is 99.94%>99.9%, which meets the sealing requirements and the product is qualified.

[0061] It can be seen from Examples 1 to 6 that when the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 satisfies the range of 0.05mm≤ac≤0.1mm, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 satisfies the range of 0.05mm≤db≤0.1mm, the height dimension e of the first arc segment 131 along the third direction satisfies the range of 3mm≤e≤5mm, and the height dimension h1 of the plug-in boss 22 along the third direction satisfies the range of 0.75mm≤h1≤2.25mm, the shell insertion is smooth without damaging the shell body 1, the shell insertion yield and the sealing yield both meet the standards, and the product is qualified.

[0062] In Comparative Example 1, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0 mm, which does not satisfy the range of 0.05 mm ≤ ac ≤ 0.1 mm. The difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.06 mm, which satisfies the range of 0.05 mm ≤ db ≤ 0.1 mm. The height dimension e of the first arc segment 131 along the third direction is set to 4 mm, which satisfies the range of 3 mm ≤ e ≤ 5mm, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, the shell entry is smooth, no damage to the shell body 1 is found, and the shell entry yield is 99.97%>99.9%, which meets the shell entry requirements. However, after the cover plate 2 is welded to the shell body 1, a helium inspection test is carried out, and the helium inspection test fails. In addition, the airtightness yield of the welded product is 99.21%<99.9%, which does not meet the sealing requirements.

[0063] In Comparative Example 2, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.02 mm, which does not satisfy the range of 0.05 mm ≤ ac ≤ 0.1 mm. The difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.06 mm, which satisfies the range of 0.05 mm ≤ db ≤ 0.1 mm. The height dimension e of the first arc segment 131 along the third direction is set to 4 mm, which satisfies the range of 3 mm ≤ e. ≤5mm, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, the shell entry is smooth, no damage to the shell body 1 is found, and the shell entry yield is 99.95%>99.9%, which meets the shell entry requirements. However, after the cover plate 2 is welded to the shell body 1, a helium inspection test is carried out, and the helium inspection test fails, and the airtightness yield of the welded product is 99.18%<99.9%, which does not meet the sealing requirements.

[0064] In Comparative Example 3, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.12 mm, which does not meet the range of 0.05 mm ≤ ac ≤ 0.1 mm. The difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.06 mm, which meets the range of 0.05 mm ≤ db ≤ 0.1 mm. The height dimension e of the first arc segment 131 along the third direction is set to 4 mm, which meets the range of 3 mm ≤ e≤5mm, and the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the outer shell body 1. After assembly, it is difficult to enter the shell, and it is found that the outer shell body 1 is damaged. The shell entry yield is 99.43%<99.9%, which does not meet the shell entry requirements. However, after the cover plate 2 is welded to the outer shell body 1, a helium inspection test is carried out, and the helium inspection test is qualified. Moreover, the airtightness yield of the welded product is 99.92%<99.9%, which meets the sealing requirements.

[0065] It can be seen from Comparative Examples 1 to 3 that when the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to be less than the minimum value of 0.05mm≤ac≤0.1mm, the interference between the plug-in boss 22 and the shell body 1 is too small. Although the shell entry is smoother, the friction resistance between the cover plate 2 and the shell body 1 is reduced, resulting in the cover plate 2 being bounced up after assembly, resulting in a gap between the cover plate 2 and the shell body 1, and ultimately resulting in failure to pass the helium inspection test and unqualified sealing after welding; and when the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is greater than the maximum value of 0.05mm≤ac≤0.1mm, due to the large interference, it is extremely difficult to insert the plug-in boss 22 into the shell body 1, and ultimately the shell body 1 is damaged, so that the shell entry yield cannot meet the requirements.

[0066] In Comparative Example 4, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.06 mm, which satisfies the range of 0.05 mm ≤ ac ≤ 0.1 mm. The difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0 mm, which does not satisfy the range of 0.05 mm ≤ db ≤ 0.1 mm. The height dimension e of the first arc segment 131 along the third direction is set to 4 mm, which satisfies the range of 3 mm ≤ e. ≤5mm, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, it is difficult to enter the shell, and it is found that the shell body 1 is damaged. The shell entry yield is 99.62%<99.9%, which does not meet the shell entry requirement. However, after the cover plate 2 is welded to the shell body 1, a helium inspection test is carried out, and the helium inspection test is qualified. Moreover, the airtightness yield of the welded product is 99.91%<99.9%, which meets the sealing requirement.

[0067] In comparative example 5, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.06 mm, which satisfies the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.02 mm, which does not satisfy the range of 0.05 mm ≤ db ≤ 0.1 mm, and the height dimension e of the first arc segment 131 along the third direction is set to 4 mm, which satisfies the range of 3 mm ≤ The range of e≤5mm is set, and the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the outer shell body 1. After assembly, it is difficult to enter the shell, and it is found that the outer shell body 1 is damaged. The shell entry yield is 99.83%<99.9%, which does not meet the shell entry requirements. However, after the cover plate 2 is welded to the outer shell body 1, a helium inspection test is carried out, and the helium inspection test is qualified. Moreover, the airtightness yield of the welded product is 99.93%<99.9%, which meets the sealing requirements.

[0068] In Comparative Example 6, the difference between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to (ac) = 0.06 mm, which satisfies the range of 0.05 mm ≤ ac ≤ 0.1 mm. The difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to (db) = 0.12 mm, which does not satisfy the range of 0.05 mm ≤ db ≤ 0.1 mm. The height dimension e of the first arc segment 131 along the third direction is set to 4 mm, which satisfies the range of 3 mm ≤ e. ≤5mm, the height dimension h1 of the plug-in boss 22 along the third direction is set to 1.5mm, which meets the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, the shell entry is smooth, no damage to the shell body 1 is found, and the shell entry yield is 99.95%>99.9%, which meets the shell entry requirements. However, after the cover plate 2 is welded to the shell body 1, a helium inspection test is carried out, and the helium inspection test fails, and the airtightness yield of the welded product is 99.34%<99.9%, which does not meet the sealing requirements.

[0069] It can be seen from Comparative Examples 4 to 6 that when the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second wall surfaces 12 is less than the minimum value of 0.05mm≤db≤0.1mm, the gap between the width of the plug-in boss 22 in the second direction and the shell body 1 is too small. Although the friction resistance between the cover plate 2 and the shell body 1 is increased, the cover plate 2 is prevented from being bounced up after assembly, resulting in a gap between the cover plate 2 and the shell body 1, thereby having good welding air tightness, but due to the small gap, the gap is too small. This makes it extremely difficult to insert the plug-in boss 22 into the shell body 1, eventually causing damage to the shell body 1, making it impossible to meet the shell insertion yield requirement, and when the difference between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second wall surfaces 12 is greater than the maximum value of 0.05mm≤db≤0.1mm, the gap between the width of the plug-in boss 22 in the second direction and the shell body 1 is too large. Although the shell insertion is smoother, the helium inspection test cannot be passed due to the large gap, and the sealing after welding is unqualified.

[0070] In comparative example 7, the difference (ac) between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to be 0.06 mm, which satisfies the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference (db) between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to be 0.06 mm, which satisfies the range of 0.05 mm ≤ db ≤ 0.1 mm, the height dimension e of the first arc segment 131 along the third direction is set to be 1 mm, which does not satisfy the range of 3 mm ≤ e ≤ 5 mm, and the height dimension h1 of the plug-in boss 22 along the third direction is set to be 1.5 mm, which satisfies the range of 0.05 mm ≤ db ≤ 0.1 mm. The range of 0.75mm≤h1≤2.25mm is sufficient. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, since the height dimension e of the first arc segment 131 along the third direction is too small, it is impossible to completely cover the four corners of the plug-in boss 22 inserted into the shell body 1 in height, so that after the cover plate 2 and the shell body 1 are assembled, there is a gap between the cover plate 2 and the shell body 1, and the cover plate 2 cannot be completely pressed into the shell body 1. Therefore, not only does it result in a shell entry yield of 99.4% < 99.9%, which does not meet the shell entry requirements, but also the airtightness yield of the product after welding is 99.35% < 99.9%, and it cannot pass the helium test and does not meet the sealing requirements.

[0071] In comparative example 8, the difference (ac) between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to be 0.06 mm, which satisfies the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference (db) between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to be 0.06 mm, which satisfies the range of 0.05 mm ≤ db ≤ 0.1 mm, the height dimension e of the first arc segment 131 along the third direction is set to be 2 mm, which does not satisfy the range of 3 mm ≤ e ≤ 5 mm, and the height dimension h1 of the plug-in boss 22 along the third direction is set to be 1.5 mm, which satisfies the range of 0.05 mm ≤ db ≤ 0.1 mm. The range of 0.75mm≤h1≤2.25mm is sufficient. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, since the height dimension e of the first arc segment 131 along the third direction is too small, it is impossible to completely cover the four corners of the plug-in boss 22 inserted into the shell body 1 in height, so that after the cover plate 2 and the shell body 1 are assembled, there is a gap between the cover plate 2 and the shell body 1, and the cover plate 2 cannot be completely pressed into the shell body 1. Therefore, not only does it result in a shell entry yield of 99.48% < 99.9%, which does not meet the shell entry requirements, but also the airtightness yield of the product after welding is 99.27% ​​< 99.9%, and it cannot pass the helium test and does not meet the sealing requirements.

[0072] It can be seen from Comparative Examples 7 to 8 that when the height dimension e of the first arc segment 131 is less than the minimum value of 3mm≤e≤5mm, the plug-in boss 22 of the cover plate 2 will not be able to completely cover the four corners of the plug-in boss 22 inserted into the shell body 1 in height when inserted into the shell body 1, so that the cover plate 2 cannot fit tightly with the shell body 1, resulting in a gap between the cover plate 2 and the shell body 1, and ultimately resulting in the product's shell entry yield and product airtightness not meeting the requirements, and the product is unqualified.

[0073] In comparative example 9, the difference (ac) between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to be 0.06 mm, which satisfies the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference (db) between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to be 0.06 mm, which satisfies the range of 0.05 mm ≤ db ≤ 0.1 mm, the height dimension e of the first arc segment 131 along the third direction is set to be 5 mm, which satisfies the range of 3 mm ≤ e ≤ 5 mm, and the height dimension e of the plug-in boss 22 along the third direction is set to be 5 mm, which satisfies the range of 3 mm ≤ e ≤ 5 mm. The inch h1 is 0.5mm, which does not meet the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, due to the insufficient contact area between the plug-in boss 22 and the shell body 1, the cover plate 2 is bounced up after the cover plate 2 and the shell body 1 are assembled, so that there is a gap between the cover plate 2 and the shell body 1, and the cover plate 2 cannot be completely pressed into the shell body 1. Therefore, not only does it result in a shell entry yield of 99.39% < 99.9%, which does not meet the shell entry requirements, but the airtightness yield of the product after welding is 99.36% < 99.9%, and it cannot pass the helium test and does not meet the sealing requirements.

[0074] In comparative example 10, the difference (ac) between the length dimension a of the plug-in boss 22 along the first direction and the spacing dimension c between the two opposite first walls 11 is set to be 0.06 mm, which satisfies the range of 0.05 mm ≤ ac ≤ 0.1 mm, the difference (db) between the width dimension b of the plug-in boss 22 along the second direction and the spacing dimension d between the two opposite second walls 12 is set to be 0.06 mm, which satisfies the range of 0.05 mm ≤ db ≤ 0.1 mm, the height dimension e of the first arc segment 131 along the third direction is set to be 5 mm, which satisfies the range of 3 mm ≤ e ≤ 5 mm, and the height dimension e of the plug-in boss 22 along the third direction is set to be 5 mm, which satisfies the range of 3 mm ≤ e ≤ 5 mm. The dimension h1 is 0.6mm, which does not meet the range of 0.75mm≤h1≤2.25mm. At this time, the cover plate 2 is inserted into the shell body 1. After assembly, due to the insufficient contact area between the plug-in boss 22 and the shell body 1, the cover plate 2 is bounced up after the cover plate 2 and the shell body 1 are assembled, so that there is a gap between the cover plate 2 and the shell body 1, and the cover plate 2 cannot be completely pressed into the shell body 1. Therefore, not only does it result in a shell entry yield of 99.41% < 99.9%, which does not meet the shell entry requirements, but the airtightness yield of the product after welding is 99.29% < 99.9%, and it cannot pass the helium test and does not meet the sealing requirements.

[0075] It can be seen from Comparative Examples 9 and 10 that when the height dimension h1 of the plug-in boss 22 along the third direction is less than the minimum value of 0.75mm≤h1≤2.25mm, the contact area between the plug-in boss 22 and the shell body 1 will be insufficient, so that after the cover plate 2 is assembled with the shell body 1, the cover plate 2 is bounced up, making it impossible for the cover plate 2 to fit tightly with the shell body 1, resulting in a gap between the cover plate 2 and the shell body 1, ultimately resulting in the product's shell entry yield and product airtightness not meeting the requirements, and the product is unqualified.

[0076] Alternatively, if Figure 5 As shown, the plug-in boss 22 includes two first surfaces 221 arranged opposite to each other in the first direction and two second surfaces 222 arranged opposite to each other in the second direction. The first surface 221 and the adjacent second surface 222 are transitionally connected via an arc angle 223, and the arc angle 223 is accommodated in the first arc segment 131. By providing the arc angle 223 of transitional connection between the first surface 221 and the second surface 222 of the plug-in boss 22, the arc angle 223 and the first arc segment 131 cooperate with each other, thereby facilitating the insertion of the plug-in boss 22 into the housing body 1 and reducing the difficulty of assembly.

[0077] Alternatively, if Figure 3As shown, the thickness of the two relative first walls 11 along the first direction is t1, the thickness of the two relative second walls 12 along the second direction is t2, and 0.3mm≤t1=t2≤0.8mm is satisfied. By setting the thickness of the two relative first walls 11 to be t1, the thickness of the two relative second walls 12 to be t2, and making them satisfy 0.3mm≤t1=t2≤0.8mm, on the one hand, it is avoided that the wall thickness of the first wall 11 and the second wall 12 is too small, resulting in a weak structural strength of the shell body 1 and reducing the protective performance of the shell body 1, and on the other hand, it is avoided that the wall thickness of the first wall 11 and the second wall 12 is too large, resulting in material waste and increased manufacturing costs.

[0078] In this embodiment, since the shell body 1 is adapted to the blade battery, when t1=t2, it indicates that the shell body 1 is a shell body 1 with equal wall thickness, and the thickness dimension t1 of the two opposite first walls 11 and the thickness dimension t2 of the two opposite second walls 12 can be any value between 0.3mm and 0.8mm or a range between any two values, for example, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc.

[0079] Alternatively, if Figure 4 As shown, the battery housing also includes an explosion-proof valve, two opposite first walls 11 and two opposite second walls 12, any one of the four walls is provided with an explosion-proof valve, the thickness of the wall provided with the explosion-proof valve is n1, and satisfies 1mm≤n1≤1.2mm, and the thickness of the remaining three walls without explosion-proof valves are all n2, and satisfy 0.5mm≤n2≤0.6mm. In order to realize the pressure relief protection function of the battery shell and take into account the design requirements of electric fire isolation, the explosion-proof valve is usually set on the shell body 1. Therefore, in order to facilitate the installation of the explosion-proof valve, it is necessary to increase the wall thickness of the shell body 1. If the shell body 1 with equal wall thickness design is adopted, there will be a problem of material waste on the remaining wall surfaces without explosion-proof valves. Therefore, by making the wall thickness dimension n1 with explosion-proof valves satisfy 1mm≤n1≤1.2mm, and making the thickness dimension n2 of the remaining three walls without explosion-proof valves satisfy 0.5mm≤n2≤0.6mm, the wall thickness with explosion-proof valves is greater than the wall thickness without explosion-proof valves, thereby forming a shell body 1 with unequal wall thickness design, which not only meets the wall thickness requirements of the explosion-proof valve, but also avoids the problem of material waste on other walls without explosion-proof valves.

[0080] In this embodiment, the thickness dimension n1 of the wall surface with explosion-proof valve can be any value between 1mm and 1.2mm or a range between any two values, such as 0.1mm, 1.1mm, 1.2mm, etc.; the thickness dimension n2 of the remaining three walls without explosion-proof valve can be any value between 0.5mm and 0.6mm or a range between any two values, such as 0.5mm, 0.55mm, 0.6mm, etc.

[0081] In this embodiment, a battery is also provided, which includes an electrode group and the above-mentioned battery shell, and the electrode group is arranged in the battery shell. By using the above-mentioned battery shell, the battery avoids the cover plate 2 being ejected when assembling the cover plate 2 and the shell body 1, resulting in gaps and steps, thereby improving the sealing of the battery after assembly, avoiding the problem of electrolyte leakage, and improving the product quality of the battery.

[0082] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery housing, characterized in that: The battery housing comprises: A shell body, wherein a cavity is provided in the shell body and comprises two first walls arranged opposite to each other along a first direction and two second walls arranged opposite to each other along a second direction; A cover plate, the cover plate comprising a closed platform and an inserting boss, the inserting boss is arranged on a side of the closed platform facing the cavity and inserted into the cavity, and the closed platform is used to close the shell body; The length dimension of the plug-in boss along the first direction is a, the spacing dimension between two opposite first wall surfaces along the first direction is c, and 0.05mm≤ac≤0.1mm is satisfied.

2. The battery housing according to claim 1, characterized in that: The width dimension of the plug-in boss along the second direction is b, the spacing dimension between two opposite second wall surfaces along the second direction is d, and 0.05 mm ≤ db ≤ 0.1 mm is satisfied.

3. The battery housing according to claim 1, characterized in that: The height dimension of the plug-in boss along the third direction is h1, and satisfies 0.75mm≤h1≤2.25mm.

4. The battery housing according to claim 3, characterized in that: A height dimension of the closed platform along the third direction is h2, and satisfies 1.5 mm ≤ h1 + h2 ≤ 3 mm.

5. The battery housing according to claim 1, characterized in that: The first wall surface is transitionally connected to the adjacent second wall surface via an arc edge, the arc edge includes a first arc segment and a second arc segment, the first arc segment is arranged on a side of the second arc segment close to the cover plate, the radius size of the first arc segment is R1, the radius size of the second arc segment is R2, and 0.015mm≤(R1-R2)≤0.025mm is satisfied.

6. The battery housing according to claim 5, characterized in that: The height dimension of the first arc segment along the third direction is e, and satisfies 3mm≤e≤5mm.

7. The battery housing according to claim 5, characterized in that: The plug-in boss includes two first surfaces arranged opposite to each other along the first direction and two second surfaces arranged opposite to each other along the second direction. The first surface is transitionally connected to the adjacent second surface via an arc angle, and the arc angle is accommodated in the first arc segment.

8. The battery housing according to claim 1, characterized in that: The thickness of the two opposite first walls along the first direction is t1, the thickness of the two opposite second walls along the second direction is t2, and 0.3 mm ≤ t1 = t2 ≤ 0.8 mm is satisfied.

9. The battery housing according to claim 1, characterized in that: The battery casing also includes an explosion-proof valve, two opposite first walls and two opposite second walls, any one of the four walls is provided with the explosion-proof valve, the thickness dimension of the wall provided with the explosion-proof valve is n1, and satisfies 1mm≤n1≤1.2mm, and the thickness dimensions of the remaining three walls not provided with the explosion-proof valve are all n2, and satisfy 0.5mm≤n2≤0.6mm.

10. A battery, characterized in that The battery comprises a pole group and a battery casing as claimed in any one of claims 1 to 9, wherein the pole group is arranged in the battery casing.

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