Battery bottom case, battery case, battery case assembly, and battery

Abstract

The application provides a battery bottom shell, a battery shell, a battery shell assembly and a battery. The battery bottom shell is an integrated structure formed by stamping and drawing, wherein the battery bottom shell has an opening, the battery bottom shell comprises a bottom wall arranged opposite to the opening, a side wall and a flange arranged at the opening and extending outward, the bottom wall and the side wall are connected through a first round corner, the side wall and the flange are connected through a second round corner, and the height L1 of the side wall, the length W1 of the flange in the extending direction, the radius R1 of the first round corner and the radius R2 of the second round corner satisfy (W1*R2) / (L1*R1)<1. Through the relationship between the height L1 of the side wall, the length W1 of the flange in the extending direction, the radius R1 of the first round corner and the radius R2 of the second round corner, the problem of cracking of the battery bottom shell in the stamping and drawing process can be avoided, and the product yield of the battery bottom shell can be greatly improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery bottom shell, a battery housing, a battery housing assembly, and a battery. Background Technology

[0002] Square steel-cased lithium-ion batteries, with their relatively high energy density, can achieve better battery life in a limited space, and are therefore widely used in various consumer electronics products, becoming one of the mainstream battery selection directions in the current consumer electronics field.

[0003] The battery casing of a square steel-cased lithium-ion battery includes the battery bottom casing. In the manufacturing process of the battery bottom casing, traditional cutting processes have drawbacks such as low processing efficiency, large material loss, and high production costs, which can hardly meet the needs of large-scale industrial production.

[0004] Against this backdrop, stamping and stretching processes have been widely used in the mass production of steel shells due to their advantages such as high processing efficiency, high material utilization, and significantly lower production costs compared to traditional cutting processes, effectively promoting the industrialization of steel shell packaged battery cells.

[0005] However, during the stamping and stretching manufacturing process of the battery bottom shell, due to unreasonable structural dimensions of some shells, the steel shell is prone to breakage during continuous stretching at multiple stations.

[0006] Therefore, the battery bottom shell of the battery casing in the related technology is prone to breakage during the stamping and stretching process. Summary of the Invention

[0007] This invention provides a battery bottom shell, a battery casing, and a battery to solve the problem that battery casings in related technologies are prone to tearing during stamping and stretching processes, thereby avoiding the tearing of the battery bottom shell in this invention during stamping and stretching processes.

[0008] The battery bottom shell of this invention is an integral structure formed by stamping and stretching. The battery bottom shell has an opening and includes a bottom wall, a side wall, and a flange provided at the opening and extending outward. The bottom wall and the side wall are connected by a first rounded corner. The side wall and the flange are connected by a second rounded corner. The height L1 of the sidewall, the length W1 of the flange in its extension direction, the radius R1 of the first fillet and the radius R2 of the second fillet satisfy: (W1*R2) / (L1*R1)<1.

[0009] It is understood that by satisfying the above-mentioned relationship between the height L1 of the sidewall, the length W1 of the flange in its extension direction, the radius R1 of the first fillet, and the radius R2 of the second fillet, the battery bottom shell of the present invention can avoid the problem of breakage during the stamping and stretching process, thereby greatly improving the product yield of the battery shell of the present invention.

[0010] In some embodiments, the battery base is a rectangular thin-walled shell.

[0011] In some embodiments, the bottom wall is arranged parallel to the flange.

[0012] In some embodiments, the bottom wall is perpendicular to the extension line of the side wall.

[0013] In some embodiments, the radius R1 of the first fillet and the radius R2 of the second fillet satisfy: R1 / R2≥1.

[0014] In some embodiments, the thickness of the sidewall is T1 and the thickness of the first fillet is T2; The second rounded corner includes a first rounded segment, a second rounded segment, and a third rounded segment connected in sequence. The end of the first rounded segment away from the second rounded segment is connected to the sidewall, and the end of the third rounded segment away from the second rounded segment is connected to the flange. The central angle a1 of the first arc segment is 30°; the central angle a2 of the second arc segment is 30°; and the central angle a3 of the third arc segment is 30°. The thickness T2 of the first rounded corner, the thickness T3 of the first arc segment, the thickness T4 of the second arc segment, and the thickness T5 of the third arc segment satisfy: (T4*T2) / (T3*T5)<1.

[0015] In some embodiments, the thickness T1 of the sidewall and the thickness T4 of the second arc segment satisfy: 0.4≤T4 / T1≤1.

[0016] In some embodiments, the battery casing is made of stainless steel.

[0017] The present invention also provides a battery casing.

[0018] The battery casing of this invention includes the battery bottom shell and battery cover as described in the above embodiments; the battery cover is disposed at the opening, and the outer edge of the battery cover is stacked with the flange, and the outer edge of the battery cover is connected to the flange by a weld. In the extending direction of the flange, the minimum distance between the weld and the inner edge of the flange is W2, and W1 and W2 satisfy: 0.1≤W2 / W1≤0.5.

[0019] In some embodiments, in the extension direction of the flange, the minimum distance between the weld and the outer edge of the flange is W3, where W3 and W1 satisfy: 0.05≤W3 / W1≤0.4.

[0020] In some embodiments, the thickness of the flange is equal to the thickness of the battery cover, and the sum of the thickness of the flange and the thickness of the battery cover, H1, satisfies the following condition with respect to the depth H of the weld: 0.85 ≥ H / H1 ≥ 0.6.

[0021] The present invention also provides a battery housing assembly.

[0022] The battery housing assembly of this invention includes: As described in the above embodiments, the battery casing has a first mounting hole on its bottom shell; A terminal assembly is provided in the first mounting hole, and an insulating seal is provided between the terminal assembly and the battery housing assembly; The pole assembly includes a pole, and the pole includes a first column passing through the first mounting hole. The diameter d1 of the first column and the diameter D1 of the first mounting hole satisfy: 0.5≤d1 / D1≤0.75.

[0023] In some embodiments, the first mounting hole is provided on the sidewall; The pole also includes a second column, which is connected to one end of the first column. The dimension W1 of the second column in the direction of extension of the side wall and the length L1 of the side wall in the direction of extension satisfy: 0.2≤W1 / L1≤0.7.

[0024] In some embodiments, the second column is located outside the sidewall, and the distance between the second column and the flange in the extending direction of the sidewall is F5; F5 and R2 satisfy: 0.03≤R2 / F5≤0.80.

[0025] In some embodiments, the pressure ring is located outside the sidewall, and the distance between the pressure ring and the flange in the extending direction of the sidewall is L3, where L3 and R2 satisfy: 0.03≤R2 / L3≤0.80.

[0026] The present invention also provides a battery.

[0027] The battery of this invention includes the battery casing assembly as described in the above embodiments. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the battery bottom shell according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the battery casing structure according to an embodiment of the present invention; Figure 3 yes Figure 2 One of the enlarged views of part A in the middle; Figure 4 yes Figure 2 Part A enlarged view, part two; Figure 5 This is a schematic diagram of the battery casing assembly according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a battery casing assembly according to another embodiment of the present invention.

[0030] In the picture: 100. Battery casing; 200. Battery casing assembly; 1. Battery bottom casing; 101. Bottom wall; 102. Side wall; 103. Opening; 104. Receiving cavity; 105. Flange; 106. First rounded corner; 107. Second rounded corner; 1071. First arc segment; 1072. Second arc segment; 1073. Third arc segment; 108. First mounting hole; 2. Battery casing cover; 3. Weld seam; 301. First inclined plane; 302. Second inclined plane; 4. Terminal assembly; 401, Pole post; 4011, First column; 4012, Second column; 4013, Third column; 402, Insulating seal; 4021, First insulating seal; 4022, Second insulating seal; 403. Pressure ring. Detailed Implementation

[0031] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] In the description of this invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal encapsulation of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] In order to solve the problem that the battery casing 100 in the related technology is prone to cracking during the stamping and stretching process, the present invention provides a battery bottom casing 1.

[0035] The battery bottom shell 1 of this embodiment is an integral structure formed by stamping and stretching. The battery bottom shell 1 has an opening 103 that accommodates the cavity 104 and communicates with the cavity 104. The battery bottom shell 1 includes a bottom wall 101, a side wall 102 and a flange 105 that is disposed at the opening 103 and extends outward. The bottom wall 101 and the side wall 102 are connected by a first fillet 106. The side wall 102 and the flange 105 are connected by a second fillet 107. Meanwhile, the height L1 of the sidewall 102, the length W1 of the flange 105 in its extension direction, the radius R1 of the first fillet 106 and the radius R2 of the second fillet 107 satisfy: (W1*R2) / (L1*R1)<1.

[0036] The height L1 of the sidewall 102 is 0.3~11mm.

[0037] Preferably, the height L1 of the sidewall 102 is any one value or a range of any two values ​​from 0.3mm, 0.5mm, 0.625mm, 0.75mm, 1mm, 2mm, 4mm, 6mm, 8mm, and 11mm.

[0038] The length W1 of the flange 105 in its extending direction is 0.05~5mm; Preferably, the length W1 of the flange 105 in its extension direction is any one value or a range of any two values ​​from 0.05mm, 0.3mm, 0.8mm, 1.2mm, 1.8mm, 2.4mm, 3.0mm, 3.6mm, 4.2mm, and 5mm.

[0039] The radius R1 of the first fillet 106 is 0.05~2.5mm; The radius R1 of the first fillet 106 is any one value or a range of any two values ​​from 0.05mm, 0.1mm, 0.12mm, 0.15mm, 0.6mm, 1.1mm, 1.6mm, 2.0mm, 2.2mm, and 2.5mm.

[0040] The radius R2 of the second fillet 107 is 0.05~2.5mm; The radius R2 of the second fillet 107 is any one value or a range of any two values ​​from 0.05mm, 0.1mm, 0.12mm, 0.15mm, 0.6mm, 1.1mm, 1.6mm, 2.0mm, 2.2mm, and 2.5mm.

[0041] It is understandable that (W1*R2) / (L1*R1)<1 can be interpreted as (W1*R2)<(L1*R1), that is, (W1*R2) is smaller than (L1*R1). In the process of stamping and stretching the sheet metal to make the battery bottom shell 1 of the present invention, it is convenient for the stamped sheet metal to flow into the die of the stamping die, thereby avoiding the problem of breakage in the battery bottom shell 1 of the present invention during the stamping and stretching process.

[0042] Therefore, by satisfying the above-mentioned relationship, the battery bottom shell 1 of the present invention can avoid the problem of breakage during the stamping and stretching process by satisfying the height L1 of the side wall 102, the length W1 of the flange 105 in its extension direction, the radius R1 of the first fillet 106 and the radius R2 of the second fillet 107.

[0043] Therefore, the battery casing 100 of the present invention is less prone to breakage during processing.

[0044] In some embodiments, the battery bottom shell 1 is a rectangular thin-walled shell.

[0045] It is understood that by setting the battery bottom shell 1 as a rectangular thin-walled shell, it is easier to process the battery bottom shell 1 of the present invention.

[0046] In some embodiments, the bottom wall 101 is arranged parallel to the flange 105.

[0047] It is understood that by arranging the bottom wall 101 and the flange 105 in parallel, it is easier to process the battery bottom shell 1 of the present invention.

[0048] In some embodiments, the bottom wall 101 is perpendicular to the extension line of the side wall 102.

[0049] It is understood that by setting the extension lines of the bottom wall 101 and the side wall 102 perpendicularly, it is easier to process the battery bottom shell 1 of the present invention.

[0050] In some embodiments, the thickness T of the battery bottom shell 1 is 0.03~0.15mm.

[0051] Preferably, the thickness T of the battery bottom shell 1 is any one value or a range of any two values ​​from 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm and 0.15mm.

[0052] It is understandable that if the thickness T of the battery casing 100 is too large, it will increase the difficulty of stamping and increase the processing cost; if the thickness of the battery bottom casing 1 is too small, although it can reduce the difficulty of stamping, the battery bottom casing 1 is prone to breakage.

[0053] Therefore, by setting the thickness of the battery bottom shell 1 to the above range, it is possible to avoid the problem of damage to the battery shell 100 without increasing the difficulty of stamping, thereby improving the yield of the battery bottom shell 1 of the present invention.

[0054] In some embodiments, the radius R1 of the first fillet 106 and the radius R2 of the second fillet 107 satisfy: R1 / R2≥1.

[0055] It is understood that R1 / R2≥1 can be interpreted as R1≥R2. When R1≥R2, during the process of stamping and stretching the sheet metal to manufacture the battery bottom shell 1 of the present invention, it is convenient for the stamped sheet metal to flow into the die of the stamping mold, thereby avoiding the problem of breakage and cracks in the battery bottom shell 1 of the present invention during the stamping and stretching process.

[0056] Therefore, by satisfying the above-mentioned relationship between the radius R1 of the first fillet 106 and the radius R2 of the second fillet 107, the battery bottom shell 1 of the present invention can avoid the problem of breakage and cracks in the stamping and stretching process.

[0057] In some embodiments, the thickness of the sidewall 102 is T1 and the thickness of the first fillet 106 is T2; The second rounded corner 107 includes a first arc segment 1071, a second arc segment 1072 and a third arc segment 1073 connected in sequence. The end of the first arc segment 1071 away from the second arc segment 1072 is connected to the side wall 102, and the end of the third arc segment 1073 away from the second arc segment 1072 is connected to the flange 105. The central angle of the first arc segment 1071 is 30°; the central angle of the second arc segment 1072 is 30°; the central angle of the third arc segment 1073 is 30°. The thicknesses T2 of the first fillet 106, T3 of the first arc segment, T4 of the second arc segment 1072, and T5 of the third arc segment 1073 satisfy the following: (T4*T2) / (T3*T5)<1.

[0058] The thickness T1 of the sidewall 102 is 0.05~2.5mm.

[0059] Preferably, the thickness T1 of the sidewall 102 is any one value or a range of any two values ​​from 0.05mm, 0.1mm, 0.12mm, 0.16mm, 0.2mm, 0.45mm, 1.0mm, 1.5mm, 2.0mm, and 2.5mm.

[0060] The thickness T2 of the first fillet 106 is 0.05~2.5mm.

[0061] Preferably, the thickness T2 of the first fillet 106 is any one value or a range of any two values ​​from 0.05mm, 0.1mm, 0.16mm, 0.2mm, 0.8mm, 1.0mm, 1.4mm, 1.8mm, 2.0mm, and 2.5mm.

[0062] The thickness T3 of the first arc segment is 0.05~2.5mm. Preferably, the thickness T3 of the first arc segment is any one value or a range of any two values ​​from 0.05mm, 0.1mm, 0.16mm, 0.19mm, 0.95mm, 1.1mm, 1.5mm, 1.9mm, 2.2mm, and 2.5mm.

[0063] The thickness T4 of the second arc segment 1072 is 0.05~2.5mm.

[0064] Preferably, the thickness T4 of the second arc segment 1072 is any one value or a range of any two values ​​from 0.05mm, 0.08mm, 0.1mm, 0.16mm, 0.7mm, 0.8mm, 1.2mm, 1.6mm, 2.0mm, and 2.5mm.

[0065] The thickness T5 of the third arc segment 1073 is 0.05~2.5mm.

[0066] Preferably, the thickness T5 of the third arc segment 1073 is any one value or a range of any two values ​​among 0.05mm, 0.1mm, 0.16mm, 0.19mm, 0.95mm, 1.1mm, 1.5mm, 1.8mm, 2.0mm, and 2.5mm.

[0067] It is understandable that (T4*T2) / (T3*T5)<1 can be interpreted as (T4*T2)<(T3*T5), that is, (T4*T2) is smaller than (T3*T5). In the process of stamping and stretching the sheet metal to produce the battery bottom shell 1 of the present invention, it is convenient for the stamped sheet metal to flow into the die of the stamping die, thereby avoiding the problem of breakage and cracks in the battery bottom shell 1 of the present invention during the stamping and stretching process.

[0068] Therefore, by satisfying the above-mentioned relationship, the battery bottom shell 1 of the present invention can further avoid the problem of breakage and cracks in the stamping and stretching process of the battery bottom shell 1 of the present invention.

[0069] In some embodiments, the thickness T1 of the sidewall 102 and the thickness T4 of the second arc segment 1072 satisfy: 0.4≤T4 / T1≤1.

[0070] It is understood that T4 / T1≤1 can be interpreted as T4≤T1. During the process of stamping and stretching the sheet metal to produce the battery bottom shell 1 of this embodiment of the invention, the stamped sheet metal is easy to flow in the die cavity of the stamping mold, thereby avoiding the problem of breakage in the battery bottom shell 1 of this embodiment of the invention during the stamping and stretching process.

[0071] However, if T4 / T1 is too small, T4 will be too small compared to T1. During the process of stamping and stretching the sheet metal to produce the battery bottom shell 1 of this embodiment, it will be difficult for the stamped sheet metal to flow into the die of the stamping mold, which will make the battery bottom shell 1 of this embodiment prone to breakage and cracks during the stamping and stretching process.

[0072] Therefore, by satisfying the above relationship between the thickness T1 of the sidewall 102 and the thickness T4 of the second arc segment 1072, the problem of breakage in the battery bottom shell 1 of the present invention during the stamping and stretching process can be avoided.

[0073] In some embodiments, the battery base 1 is made of stainless steel.

[0074] It is understandable that making the battery bottom shell 1 of stainless steel facilitates its processing.

[0075] The present invention also provides a battery casing 100.

[0076] The battery casing 100 of this embodiment includes the battery bottom casing 1 and battery casing cover 2 as described in the above embodiment; The battery cover 2 is placed at the opening 103, and the outer edge of the battery cover 2 is stacked with the flange 105. The outer edge of the battery cover 2 is connected to the flange 105 through the weld 3. In the extension direction of flange 105, the minimum distance between weld 3 and the inner edge of flange 105 is W2, and W1 and W2 satisfy: 0.1≤W2 / W1≤0.5.

[0077] Among them, the size W1 of flange 105 is 0.05~5mm.

[0078] Preferably, the dimension W1 of the flange 105 is any one value or a range of any two values ​​from 0.05mm, 0.5mm, 0.8mm, 1.4mm, 2.0mm, 2.8mm, 3.5mm, 4.2mm, 4.6mm, and 5mm.

[0079] The minimum distance W2 between weld 3 and the inner edge of flange 105 is 0.01~4mm.

[0080] Preferably, the minimum distance W2 between the weld 3 and the inner edge of the flange 105 is any one value or a range of any two values ​​selected from 0.01mm, 0.05mm, 0.125mm, 0.2mm, 0.4mm, 1.0mm, 1.8mm, 2.5mm, 3.2mm, and 4mm. Preferably, the ratio of the minimum distance W2 between the weld 3 and the inner edge of the flange 105 to the dimension W1 of the flange 105 is any one value or a range of any two values ​​selected from 0.1, 0.25, and 0.5.

[0081] It is understandable that if W2 / W1 < 0.1, the weld 3 is too close to the connection between the flange 105 and the side wall 102. This area itself has residual stress from stamping. The tensile and shear stress generated by the expansion inside the battery casing 100 will be superimposed on the root of the weld 3 with the residual stress from forming, which will greatly reduce the welding strength of the weld 3. If W2 / W1 > 0.5, the weld 3 will shift significantly outward from the flange 105. The large area of ​​the flange 105 on the inner side of the weld 3 will not be able to participate in load sharing, which will greatly reduce the welding strength of the weld 3. At the same time, it will also cause the width of the weld 3 to decrease, which in turn will reduce the welding strength.

[0082] When 0.1≤W2 / W1≤0.5 is satisfied, weld 3 avoids the stress concentration area of ​​the inner rounded corner of flange 105, and sufficient area is reserved on the inner side of weld 3 to disperse tensile and shear loads. Battery casing 100 can withstand higher internal pressure, thereby greatly improving the welding strength between battery bottom shell 1 and battery casing cover 2.

[0083] Therefore, by satisfying the above-mentioned relationship between the minimum distance W2 between the weld 3 and the inner edge of the flange 105 and the size W1 of the flange 105, the battery housing 100 of the present invention can greatly improve the welding strength between the battery bottom shell 1 and the battery cover 2, and can improve the welding shear force between the battery bottom shell 1 and the battery cover 2, so that the battery housing 100 can resist the impact of the external environment and the stress inside the battery housing 100.

[0084] In some embodiments, in the extending direction of the flange 105, the minimum distance between the weld 3 and the outer edge of the flange 105 is W3, and W3 and W1 satisfy: 0.05≤W3 / W1≤0.4.

[0085] The minimum distance between the weld 3 and the outer edge of the flange 105 is W3, where W3 is 0.01~4mm.

[0086] Preferably, the minimum distance W3 between the weld 3 and the outer edge of the flange 105 is any one value or a range of any two values ​​from 0.01mm, 0.025mm, 0.1mm, 0.16mm, 0.2mm, 0.4mm, 1.0mm, 1.8mm, 2.5mm, and 4mm.

[0087] Preferably, the ratio of W3 to W1 is any one of 0.2, 0.05, or 0.4, or a range of any two points.

[0088] It is understandable that when W3 / W1 < 0.05, weld 3 is excessively offset to the outside, and the load-bearing capacity of weld 3 decreases.

[0089] When W3 / W1 > 0.4, weld 3 is excessively offset inward, and the load-bearing capacity of weld 3 decreases.

[0090] When 0.05≤W3 / W1≤0.4, the weld 3 is positioned in the optimal stress area in the middle of the flange 105. When the internal pressure of the battery housing 100 increases, the flange 105 on the inner side of the weld 3 can share the internal pressure of the battery housing 100, thereby improving the welding strength between the battery housing 100 and the battery cover 2.

[0091] Therefore, by satisfying the above-mentioned relationship between W3 and W1, the battery casing 100 of this embodiment of the invention effectively improves the welding stability between the battery bottom shell 1 and the casing cover, optimizes the overall structural strength of the battery casing 100, reduces the risk of weld seam 3 cracking and leakage caused by internal pressure changes during long-term battery use, and improves the safety and service life of the battery.

[0092] In some embodiments, the thickness of the flange 105 is equal to the thickness of the battery cover 2, and the sum of the thickness of the flange 105 and the thickness of the battery cover 2, H1, satisfies the following condition with respect to the depth H of the weld 3: 0.85≥H / H1≥0.6.

[0093] The sum of the thickness of flange 105 and the thickness of battery cover 2, H1, is 0.1~5mm. Preferably, H1 is any one value or a range of any two values ​​selected from 0.1mm, 0.2mm, 0.28mm, 0.3mm, 1.0mm, 2.0mm, 3.0mm, and 5.0mm. Among them, the depth H of weld 3 is 0.07~4mm; Preferably, H is any one value or a range of any two values ​​selected from 0.07mm, 0.09mm, 0.14mm, 0.18mm, 0.21mm, 0.238mm, 1.0mm, 2.0mm, and 4.0mm. It is understood that the thickness of the flange 105 is equal to the thickness of the battery cover 2, and the sum of the thicknesses of the flange 105 and the battery cover 2, H1, satisfies the following condition with respect to the depth H of the weld 3: H / H1 ≥ 0.6. That is, a portion of the weld 3 is located on the battery cover 2, and a portion of the weld 3 is located on the flange 105.

[0094] When H / H1 < 0.6, the depth H of weld 3 is too small, and the interlaminar shear force inside the battery casing 100 can easily cause the casing cover and flange 105 to detach directly.

[0095] When H / H1 > 0.85, what depth H of weld 3 is most likely to cause flange 105 and battery cover 2 to be welded through, forming a gap, which will reduce the welding strength of weld 3.

[0096] When 0.85≥H / H1≥0.6, the weld penetration depth of weld 3 penetrates most of the thickness of the two plates, and the battery cover 2 and flange 105 are mostly fused together. Facing the internal pressure generated by the battery over a long period of time, the thick fusion layer is difficult to be sheared and torn, further improving the welding strength.

[0097] Therefore, by setting the sum H1 of the thickness of flange 105 and the thickness of battery cover 2 and the depth H of weld 3 to satisfy the above relationship, the welding strength of weld 3 can be further improved.

[0098] The present invention also provides a battery housing assembly 200.

[0099] The battery housing assembly 200 of this embodiment includes the battery housing 100 and the terminal assembly 4 described in the above embodiment. The battery bottom shell 1 is provided with a first mounting hole 108; the terminal assembly 4 is disposed in the first mounting hole 108, and an insulating seal 402 is provided between the terminal assembly 4 and the battery housing assembly 200; The pole assembly 4 includes a pole 401, which includes a first column 4011 through a first mounting hole 108. The diameter d1 of the first column 4011 and the diameter D1 of the first mounting hole 108 satisfy the condition: 0.5≤d1 / D1≤0.75.

[0100] The diameter d1 of the first column 4011 is 0.15~4.5mm.

[0101] Preferably, the diameter d1 of the first column 4011 is any one value or a range of any two values ​​from 0.15mm, 0.5mm, 0.75mm, 1.13mm, 1.6mm, 2.2mm, 2.8mm, 3.4mm, 4.0mm, and 4.5mm.

[0102] The diameter D1 of the first mounting hole 108 is 0.3~5mm.

[0103] Preferably, the diameter D1 of the first mounting hole 108 is any one value or a range of any two values ​​from 0.3mm, 0.8mm, 1.0mm, 1.2mm, 1.8mm, 2.4mm, 3.0mm, 3.7mm, 4.3mm, and 5mm.

[0104] Specifically, the ratio of the diameter d1 of the first column 4011 to the diameter D1 of the first mounting hole 108 is any one value or a range of any two values ​​from 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, to 0.625.

[0105] It is understandable that the ratio of the diameter d1 of the first pillar 4011 to the diameter D1 of the first mounting hole 108 can be interpreted as the distance between the outer wall of the first pillar 4011 and the inner wall of the first mounting hole 108. The larger the ratio of the diameter d1 of the first pillar 4011 to the diameter D1 of the first mounting hole 108, the smaller the distance between the outer wall of the first pillar 4011 and the inner wall of the first mounting hole 108. Consequently, the thickness of the insulating seal 402 provided between the outer wall of the first pillar 4011 and the inner wall of the first mounting hole 108 is smaller, which will reduce the insulation performance of the insulating seal 402. When the ratio of the diameter d1 of the first pillar 4011 to the diameter D1 of the first mounting hole 108 is greater than 0.75, the insulation resistance value between the electrode post 401 and the battery casing 100 is too small.

[0106] It can be further understood that the smaller the ratio of the diameter d1 of the first column 4011 to the diameter D1 of the first mounting hole 108, the greater the distance between the outer side wall of the first column 4011 and the inner side wall of the first mounting hole 108, and the greater the thickness of the insulating seal 402 provided between the outer side wall of the first column 4011 and the inner side wall of the first mounting hole 108. Although this can improve the insulation performance of the insulating seal 402, it will increase the amount of insulating seal 402 used and increase the processing cost of the battery housing assembly 200 of this embodiment of the invention.

[0107] By satisfying the above-mentioned relationship between the diameter d1 of the first column 4011 and the diameter D1 of the first mounting hole 108, the battery housing assembly 200 of this embodiment of the invention can reduce the processing cost of the battery housing assembly 200 of this embodiment of the invention while ensuring that the insulation performance between the battery bottom shell 1 and the terminal assembly 4 of the battery housing assembly 200 of this embodiment of the invention meets the requirements.

[0108] Therefore, the battery housing assembly 200 of this embodiment of the invention has the characteristic of high insulation performance between the battery bottom shell 1 and the terminal assembly 4.

[0109] In some embodiments, the first mounting hole 108 is provided on the side wall 102; the pole post 401 further includes a second post 4012, the second post 4012 is connected to one end of the first post 4011, and the dimension E1 of the second post 4012 in the extension direction of the side wall 102 and the length F1 of the side wall 102 in the extension direction satisfy: 0.2≤E1 / F1≤0.7.

[0110] The dimension E1 of the second column 4012 in the direction of extension of the side wall 102 is 0.3~11mm.

[0111] Preferably, the dimension E1 of the second column 4012 in the extension direction of the sidewall 102 is any one value or a range of any two values ​​among 0.3mm, 1.27mm, 1.38mm, 3mm, 5mm, 7mm, 8mm, 9mm, 10mm, and 11mm.

[0112] The length F1 of the sidewall 102 in its extension direction is 0.3~11mm.

[0113] Preferably, the length F1 of the sidewall 102 in its extension direction is any one value or a range of any two values ​​among 0.3mm, 2.54mm, 2.76mm, 4mm, 6mm, 6.9mm, 8mm, 9mm, 10mm, and 11mm.

[0114] Specifically, the ratio between the dimension E1 of the second column 4012 in the extension direction of the side wall 102 and the length F1 of the side wall 102 in the extension direction is a range of any one value or any two values ​​from 0.2, 0.48, 0.5, 0.55, 0.59, 0.7.

[0115] It is understandable that if the ratio of the dimension E1 of the second column 4012 in the extension direction of the sidewall 102 to the length F1 of the sidewall 102 in the extension direction is too large, it will result in the distance between the second column 4012 and the bottom wall 101 being too small, shortening the creepage distance between the second column 4012 and the bottom wall 101, and reducing the insulation resistance between the terminal 401 and the battery casing 100. If the ratio of the dimension E1 of the second column 4012 in the extension direction of the sidewall 102 to the length F1 of the sidewall 102 in the extension direction is too small, although it can extend the creepage distance between the second column 4012 and the bottom wall 101, excessively reducing the dimension E1 of the second column 4012 in the extension direction of the sidewall 102 will reduce the current carrying capacity of the battery casing assembly 200 of this embodiment, which will in turn reduce the current carrying capacity of the battery subsequently manufactured.

[0116] Therefore, by setting the ratio of the dimension E1 of the second column 4012 in the extension direction of the side wall 102 to the length F1 of the side wall 102 in the extension direction to the range described above, the battery housing assembly 200 of the present invention can improve the current carrying capacity of the battery housing assembly 200 of the present invention while ensuring that the insulation performance between the battery bottom shell 1 and the terminal assembly 4 of the battery housing assembly 200 of the present invention meets the requirements.

[0117] In some embodiments, the second column 4012 is located outside the sidewall 102, and the distance between the second column 4012 and the flange 105 in the extending direction of the sidewall 102 is F5; F5 and R2 satisfy: 0.03≤R2 / F5≤0.80.

[0118] The radius R2 of the second fillet 107 is 0.03~2.5mm.

[0119] Preferably, the radius R2 of the second fillet 107 is any one value or a range of any two values ​​from 0.03mm, 0.08mm, 0.1mm, 0.13mm, 0.64mm, 0.72mm, 1.2mm, 1.6mm, 2.0mm, and 2.5mm.

[0120] The distance F5 between the second column 4012 and the flange 105 is 0.03~10mm.

[0121] Preferably, the distance F5 between the second column 4012 and the flange 105 is any one value or a range of any two values ​​from 0.03mm, 0.8mm, 1mm, 1.3mm, 2.7mm, 4mm, 5.5mm, 7mm, 8.5mm, and 10mm.

[0122] It is understandable that if the ratio between the radius R2 of the second fillet 107 and the distance F5 between the second pillar 4012 and the flange 105 is too large, since the second fillet 107 is an arc-shaped structure, an excessively large second fillet 107 will shorten the distance between the second fillet 107 and the terminal assembly 4, thereby shortening the creepage distance between the terminal assembly 4 and the second fillet 107, and consequently reducing the insulation resistance between the terminal 401 and the battery casing 100. If the ratio between the radius R2 of the second fillet 107 and the distance F5 between the second pillar 4012 and the flange 105 is too small, since the position of the terminal assembly 4 on the battery casing 100 is fixed, the radius of the second fillet 107 will decrease, thereby increasing the processing difficulty of the second fillet 107 and thus increasing the processing cost.

[0123] Therefore, by setting the ratio between the radius R2 of the second fillet 107 and the distance F5 between the second column 4012 and the flange 105 to the above range, the processing cost of the battery housing assembly 200 of the present invention can be reduced while ensuring that the insulation performance between the battery bottom shell 1 and the terminal assembly 4 of the battery housing assembly 200 of the present invention meets the requirements.

[0124] In some embodiments, the pole post 401 further includes a third post 4013 and a pressure ring 403. The third post 4013 is connected to the other end of the first post 4011. The pressure ring 403 is sleeved on the first post 4011 and is located between the third post 4013 and the insulating seal 402. The pressure ring 403 is located outside the side wall 102. In the extending direction of the side wall 102, the distance between the pressure ring 403 and the flange 105 is F3. F3 and R2 satisfy: 0.03≤R2 / F3≤0.80.

[0125] The radius R2 of the second fillet 107 is 0.03~2.5mm.

[0126] Preferably, the radius R2 of the second fillet 107 is any one value or a range of any two values ​​from 0.03mm, 0.08mm, 0.1mm, 0.13mm, 0.64mm, 0.72mm, 1.2mm, 1.6mm, 2.0mm, and 2.5mm.

[0127] The distance F3 between the pressure ring 403 and the flange 105 is 0.03-10mm.

[0128] Preferably, the distance F3 between the pressure ring 403 and the flange 105 is any one of the following values: 0.03mm, 0.8mm, 1.5mm, 2.2mm, 3.6mm, 4.8mm, 6.2mm, 7.5mm, 8.8mm, and 10mm, or a range consisting of any two of these values, including both endpoints. Specifically, the ratio of the radius R2 of the second fillet 107 to the distance F3 between the pressure ring 403 and the flange 105 is any one of the following values: 0.03, 0.09, 0.1, 0.12, 0.2, and 0.8, or a range consisting of any two of these values.

[0129] It is understandable that if the ratio between the radius R2 of the second fillet 107 and the distance F3 between the pressure ring 403 and the flange 105 is too large, since the second fillet 107 is an arc-shaped structure, an excessively large second fillet 107 will shorten the distance between the second fillet 107 and the terminal assembly 4, thereby shortening the creepage distance between the terminal assembly 4 and the second fillet 107, and consequently reducing the insulation resistance between the terminal 401 and the battery casing 100. If the ratio between the radius R2 of the second fillet 107 and the distance F3 between the pressure ring 403 and the flange 105 is too small, since the position of the terminal assembly 4 on the battery casing 100 is fixed, the radius of the second fillet 107 will decrease, thereby increasing the processing difficulty of the second fillet 107 and thus increasing the processing cost.

[0130] Therefore, by setting the ratio between the radius R2 of the second fillet 107 and the distance F3 between the pressure ring 403 and the flange 105 to the above range, the processing cost of the battery housing assembly 200 of the present invention can be reduced while ensuring that the insulation performance between the battery bottom shell 1 and the terminal assembly 4 of the battery housing assembly 200 of the present invention meets the requirements.

[0131] The present invention also provides a battery.

[0132] The battery of this invention includes the battery housing assembly 200 described in the above embodiments.

[0133] The battery base shell of the present invention will be further described below through specific embodiments.

[0134] Table 1 Table 1 (continued) Example 1 Example 1 illustrates the battery bottom shell disclosed in this invention. The battery bottom shell of Example 1 is an integral structure formed by stamping and stretching. The battery bottom shell has an opening and includes a bottom wall, a side wall, and a flange provided at the opening and extending outward. The bottom wall and the side wall are connected by a first rounded corner. The side wall and the flange are connected by a second rounded corner. Meanwhile, the height L1 of the side wall, the length W1 of the flange in its extension direction, the radius R1 of the first rounded corner, and the radius R2 of the second rounded corner are all recorded in Table 1.

[0135] Example 2-10 Examples 2-10 illustrate the battery base shell disclosed in this invention, including most of the configurations in Example 1, with the following differences: The height L1 of the sidewall, the length W1 of the flange in its extension direction, the radius R1 of the first fillet and the radius R2 of the second fillet, and other related parameters are all recorded in Table 1.

[0136] Comparative Examples 1-2 Comparative Examples 1-2 are used to illustrate the battery base shell disclosed in this invention, including most of the arrangements in Example 1, with the following differences: The height L1 of the sidewall, the length W1 of the flange in its extension direction, the radius R1 of the first fillet and the radius R2 of the second fillet, and other related parameters are all recorded in Table 1.

[0137] Performance testing Test method: The battery casings of Examples 1-10 and Comparative Examples 1-2 were tested as follows: Test methods and procedures; Under normal temperature conditions, the condition of the battery bottom shell is observed under a 200x microscope to determine whether cracks or breaks appear in various parts of the battery bottom shell.

[0138] Fill in the test results in Table 1: The test results above show that: Regarding the parameter (W1*R2) / (L1*R1), it can be seen from Examples 1-2 and Comparative Examples 1-2 that when the height L1 of the sidewall, the length W1 of the flange in its extension direction, the radius R1 of the first fillet and the radius R2 of the second fillet satisfy (W1*R2) / (L1*R1) < 1, no cracks or breaks appear in the battery bottom shell.

[0139] As mentioned above, by satisfying the above relationship between the height L1 of the sidewall, the length W1 of the flange in its extension direction, the radius R1 of the first fillet and the radius R2 of the second fillet, the stamped sheet material is facilitated to flow into the die of the stamping die, thereby avoiding the problem of breakage and cracks in the battery bottom shell of the present invention during the stamping and stretching process.

[0140] Regarding the parameter R1 / R2, it can be seen from Examples 2 and 3-4 that the radius R1 of the first rounded corner and the radius R2 of the second rounded corner satisfy the following condition: when R1 / R2≥1, it can be concluded that when the radius R1 of the first rounded corner and the radius R2 of the second rounded corner satisfy R1 / R2≥1, no cracks or breaks appear in the battery bottom shell; when R1 / R2<1, cracks and defects appear in the battery bottom shell.

[0141] As mentioned above, by satisfying the above relationship between the radius R1 of the first fillet and the radius R2 of the second fillet, the stamped sheet material can flow into the die cavity of the stamping die, thus avoiding the problem of breakage and cracks in the battery bottom shell of the present invention during the stamping and stretching process.

[0142] Regarding the parameter (T4*T2) / (T3*T5), it can be seen from Examples 2 and 8-9 that when the thickness T2 of the first rounded corner, the thickness T3 of the first arc of the second rounded corner, the thickness T4 of the middle arc of the second rounded corner, and the thickness T5 of the last arc of the second rounded corner satisfy (T4*T2) / (T3*T5)<1, no cracks or breaks appear in the battery bottom shell; when (T4*T2) / (T3*T5)≥1, crack defects appear in the battery bottom shell.

[0143] As mentioned above, by satisfying the above relationship between the thickness T2 of the first rounded corner, the thickness T3 of the first arc segment, the thickness T4 of the second arc segment, and the thickness T5 of the third arc segment, the stamped sheet material is facilitated to flow into the die cavity of the stamping die, thereby avoiding the problem of breakage and cracks in the battery bottom shell of the present invention during the stamping and stretching process.

[0144] Regarding the parameter T4 / T1, it can be seen from Examples 2 and 7-10 that when the thickness T1 of the sidewall and the thickness T4 of the arc in the middle section of the second rounded corner satisfy 0.4≤T4 / T1≤1, no cracks or breaks appear in the battery bottom shell; when T4 / T1<0.4 or T4 / T1>1, crack defects appear in the battery bottom shell.

[0145] As mentioned above, by satisfying the above relationship between the thickness of the sidewall T1 and the thickness T4 of the second arc segment, the stamped sheet material can flow into the die of the stamping die, thus avoiding the problem of breakage in the battery bottom shell of the present invention during the stamping and stretching process.

[0146] As shown in Table 1, the present invention, by limiting the above-mentioned parameters of the battery bottom shell, simultaneously satisfies the following conditions: The height of the sidewall is L1, the length of the flange in its extension direction is W1, the radius of the first fillet is R1, and the radius of the second fillet is R2. L1, W1, R1, and R2 satisfy the relationship: (W1*R2) / (L1*R1)<1. The radius of the first rounded corner is R1, and the radius of the second rounded corner is R2. R1 and R2 satisfy the relationship: R1 / R2≥1; The thickness of the sidewall is T1, and the thickness of the arc in the middle section of the second fillet is T4. T1 and T4 satisfy the relationship: 0.4≤T4 / T1≤1; The thickness of the first rounded corner is T2, the thickness of the first arc of the second rounded corner is T3, the thickness of the middle arc of the second rounded corner is T4, and the thickness of the last arc of the second rounded corner is T5. T2, T3, T4, and T5 satisfy the relationship: (T4*T2) / (T3*T5)<1. The battery bottom shell of the present invention can avoid forming defects such as cracks and breaks during the stamping and stretching process.

[0147] The battery casing of the present invention will be further described below through specific embodiments.

[0148] Table 2 Example 1 Example 1 illustrates the battery casing disclosed in this invention. The battery casing of Example 1 includes a battery bottom shell and a battery casing cover. The battery bottom shell has an opening and includes a bottom wall, a side wall, and a flange that extends outward from the opening. The bottom wall and the side wall intersect each other, and the side wall intersects with the flange. The battery casing cover is disposed at the opening, and the outer edge of the battery casing cover is stacked with the flange. The outer edge of the battery casing cover is connected to the flange by a weld. In the extension direction of the flange, the minimum distance W2 between the weld and the inner edge of the flange and the size W1 of the flange are recorded in Table 2.

[0149] Example 2-11 Examples 2-11 illustrate the battery casing disclosed in this invention, including most of the configurations in Example 1, with the following differences: In the extension direction of the flange, the minimum distance W2 between the weld and the inner edge of the flange and the flange size W1, and other related parameters are recorded in Table 2.

[0150] Comparative Examples 1-2 Comparative Examples 1-2 are used to illustrate the battery casing disclosed in this invention, including most of the arrangements in Example 1, with the following differences: In the extension direction of the flange, the minimum distance W2 between the weld and the inner edge of the flange and the flange size W1, and other related parameters are recorded in Table 2.

[0151] Performance testing Test method: At room temperature, the battery casing is sealed and placed in a burst chamber. High-pressure gas is then injected into the battery casing until the bottom shell and the battery casing cover burst open. The gas pressure value injected into the battery casing is recorded and filled into Table 2.

[0152] As can be seen from the test results in Table 2, Regarding the parameter W2 / W1, it can be seen from Examples 1-3 and Comparative Examples 1-2 that when the flange size W1 and the minimum distance W2 between the weld and the inner edge of the flange satisfy 0.1≤W2 / W1≤0.5, the gas pressure value that rushes in when the battery casing bursts open is higher, and the weld strength of the weld is the highest; when W2 / W1<0.1 or W2 / W1>0.5, the gas pressure value that rushes in when the battery casing bursts open is lower, and the weld strength of the weld decreases.

[0153] As mentioned earlier, if W2 / W1 < 0.1, the weld is too close to the connection between the flange and the sidewall. This area itself has residual stress from stamping. The tensile and shear stress generated by the expansion inside the battery casing will be superimposed on the root of the weld with the residual stress from forming, which will greatly reduce the welding strength of the weld. If W2 / W1 > 0.5, the weld will shift significantly outward from the flange, and the large area of ​​the flange on the inner side of the weld will not be able to participate in load sharing. This will result in a significant reduction in the weld strength and a smaller weld width, which in turn will reduce the weld strength.

[0154] When 0.1≤W2 / W1≤0.5 is satisfied, the weld avoids the stress concentration area of ​​the inner corner of the flange, and the inner side of the weld has a sufficient area to disperse the tensile and shear loads. The battery casing can withstand higher internal pressure, which greatly improves the welding strength between the battery bottom shell and the battery cover.

[0155] Regarding the parameter W3 / W1, it can be seen from Examples 1 and 4-7 that when the flange size W1 and the minimum distance W3 between the weld and the outer edge of the flange satisfy 0.05≤W3 / W1≤0.4, the gas pressure value that rushes in when the battery casing bursts open is the highest, and the welding strength of the battery casing is the highest; when W3 / W1<0.05 and W3 / W1>0.4, the gas pressure value that rushes in when the battery casing bursts open is reduced, and the welding strength of the battery casing decreases.

[0156] As mentioned earlier, when W3 / W1 < 0.05, the weld is excessively offset to the outside, and the weld's load-bearing capacity decreases.

[0157] When W3 / W1 > 0.4, the weld is excessively offset inward, and the weld's load-bearing capacity decreases.

[0158] When 0.05≤W3 / W1≤0.4, the weld is positioned in the optimal stress area in the middle of the flange. When the internal pressure of the battery casing increases, the flange on the inner side of the weld can share the internal pressure of the battery casing, thereby improving the welding strength between the battery casing and the battery cover.

[0159] Regarding the parameter H / H1, it can be seen from Examples 1 and 8-11 that when the sum of the thickness of the flange and the thickness of the battery casing H1, and the depth of the weld H, satisfy H / H1≥0.6, the air pressure value that rushes in when the battery casing bursts open is the highest, and the welding strength of the battery casing is the highest; when H / H1<0.6, the air pressure value that rushes in when the battery casing bursts open is reduced, and the welding strength of the battery casing decreases.

[0160] As mentioned earlier, when H / H1 < 0.6, the weld depth H is too small, and the interlayer shear force inside the battery casing can easily cause the casing cover and flange to detach directly.

[0161] When H / H1 > 0.85, what weld depth H is most likely to cause the flange and battery cover to be welded through, forming a gap, which will reduce the weld strength.

[0162] When 0.85≥H / H1≥0.6, the weld penetration depth penetrates most of the thickness of the two plates, and the battery cover and flange are mostly fused together. Facing the internal pressure generated by the battery over a long period of time, the thick fusion layer is difficult to be sheared and torn, further improving the welding strength.

[0163] As shown in Table 2, this invention limits the dimensions of the welding position on the battery casing, and the following conditions are met: The flange dimension W1 and the minimum distance W2 between the weld and the inner edge of the flange satisfy the following relationship: 0.1≤W2 / W1≤0.5; The flange dimension W1 and the minimum distance W3 between the weld and the outer edge of the flange satisfy the following relationship: 0.05≤W3 / W1≤0.4; The sum of the flange thickness and the battery casing thickness, H1, and the weld depth, H, satisfy the following relationship: H / H1≥0.6; The battery casing of this invention has the highest air pressure when it bursts open, and the welding strength between the battery bottom shell and the battery casing cover is the highest, which can meet the battery safety standards.

[0164] The battery housing assembly of the present invention will be further described below through specific embodiments.

[0165] Table 3 Example 1 Example 1 illustrates the battery housing assembly disclosed in this invention. The battery housing assembly of Example 1 includes a battery housing and a terminal assembly. The battery housing includes a battery bottom shell, which has a receiving cavity and an opening communicating with the receiving cavity. The battery housing assembly has a first mounting hole. The terminal assembly is disposed in the first mounting hole, and an insulating seal is provided between the terminal assembly and the battery housing assembly. The terminal assembly includes a terminal, which includes a first column passing through the first mounting hole. The diameter d1 of the first column, the diameter D1 of the first mounting hole, and other relevant parameters are recorded in Table 3.

[0166] Examples 2-9 Examples 2-9 illustrate the battery housing assembly disclosed in this invention, including most of the arrangements in Example 1, with the following differences: The relevant parameters, such as the diameter d1 of the first column and the diameter D1 of the first mounting hole, are recorded in Table 3.

[0167] Comparative Examples 1-3 Comparative Examples 1-3 are used to illustrate the battery housing assembly disclosed in this invention, including most of the arrangements in Example 1, with the following differences: The relevant parameters, such as the diameter d1 of the first column and the diameter D1 of the first mounting hole, are recorded in Table 3.

[0168] Performance testing The insulation resistance between the battery terminals and the battery casing of the battery casing assemblies including Examples 1-9 and Comparative Examples 1-3 was tested: Test methods and steps: Place the battery in the fixture; The insulation resistance between the terminal and the battery casing was tested multiple times using an insulation resistance tester. The average insulation resistance between the terminal and the battery casing is obtained.

[0169] Enter the average insulation resistance value between the terminal and the battery casing into Table 3.

[0170] As can be seen from Table 3, Regarding the parameter d1 / D1, it can be seen from Examples 1-3 and Comparative Examples 1-3 that when the diameter D1 of the first mounting hole and the diameter d1 of the first post satisfy 0.5≤d1 / D1≤0.75, the insulation resistance between the post and the battery casing is higher.

[0171] As mentioned above, the smaller the ratio of the diameter d1 of the first column to the diameter D1 of the first mounting hole, the greater the thickness of the insulating seal between the outer wall of the first column and the inner wall of the first mounting hole. Although this can improve the insulation performance of the insulating seal, it will increase the amount of insulating seal used and increase the processing cost of the battery housing assembly in this embodiment of the invention.

[0172] By satisfying the above-mentioned relationship between the diameter d1 of the first post and the diameter D1 of the first mounting hole, the battery housing assembly of this embodiment can reduce the processing cost of the battery housing assembly of this embodiment while ensuring that the insulation performance between the battery bottom shell and the terminal post assembly meets the requirements.

[0173] Regarding the parameter E1 / F1, it can be seen from Examples 1 and 4-5 that when the second column dimension E1 and the sidewall extension length F1 satisfy 0.2≤E1 / F1≤0.7, the insulation resistance is high.

[0174] As mentioned above, if the ratio of the dimension E1 of the second column in the sidewall extension direction to the length F1 of the sidewall in its extension direction is too small, although the creepage distance between the second column and the bottom wall can be extended, excessively reducing the dimension E1 of the second column in the sidewall extension direction will reduce the current carrying capacity of the battery housing assembly in this embodiment of the invention, which in turn will reduce the current carrying capacity of the battery subsequently manufactured.

[0175] Therefore, by setting the ratio of the dimension E1 of the second column in the sidewall extension direction to the length F1 of the sidewall in its extension direction to the above range, the battery housing assembly of the present invention can improve the current carrying capacity of the battery housing assembly of the present invention while ensuring that the insulation performance between the battery bottom shell and the terminal assembly of the battery housing assembly of the present invention meets the requirements.

[0176] Regarding the parameter R2 / F5, it can be seen from Examples 1 and 6-7 that when the fillet radius R2 and the distance F5 between the column flanges satisfy 0.03≤R2 / F5≤0.8, the insulation resistance is high.

[0177] As mentioned earlier, if the ratio of the radius R2 of the second fillet to the distance F5 between the second column and the flange is too large, since the second fillet is an arc-shaped structure, an excessively large second fillet will shorten the distance between the second fillet and the terminal assembly, thereby shortening the creepage distance between the terminal assembly and the second fillet, and consequently reducing the insulation resistance between the terminal and the battery casing. If the ratio of the radius R2 of the second fillet to the distance F5 between the second column and the flange is too small, since the position of the terminal assembly on the battery casing is fixed, the radius of the second fillet will decrease, which will increase the processing difficulty of the second fillet and thus increase the processing cost.

[0178] Therefore, by setting the ratio between the radius R2 of the second fillet and the distance F5 between the second column and the flange to the range described above, the processing cost of the battery housing assembly of the present invention can be reduced while ensuring that the insulation performance between the battery bottom shell and the terminal assembly of the battery housing assembly of the present invention meets the requirements.

[0179] Regarding the parameter R2 / F3, it can be seen from Examples 1 and 8-9 that when the fillet radius R2 and the distance F3 between the pressure ring flanges satisfy 0.03≤R2 / F3≤0.8, the insulation resistance is high.

[0180] As mentioned earlier, if the ratio of the radius R2 of the second fillet to the distance F3 between the pressure ring and the flange is too large, since the second fillet is an arc-shaped structure, an excessively large second fillet will shorten the distance between the second fillet and the terminal assembly, thereby shortening the creepage distance between the terminal assembly and the second fillet, and consequently reducing the insulation resistance between the terminal and the battery casing. If the ratio of the radius R2 of the second fillet to the distance F3 between the pressure ring and the flange is too small, since the position of the terminal assembly on the battery casing is fixed, the radius of the second fillet will decrease, which will increase the processing difficulty of the second fillet and thus increase the processing cost.

[0181] Therefore, by setting the ratio between the radius R2 of the second fillet and the distance F3 between the pressure ring and the flange to the range described above, the processing cost of the battery housing assembly of the present invention can be reduced while ensuring that the insulation performance between the battery bottom shell and the terminal assembly of the battery housing assembly of the present invention meets the requirements.

[0182] As shown in Table 3, this invention optimizes the battery terminal assembly structure dimensions and satisfies the following conditions: The diameter D1 of the first mounting hole and the diameter d1 of the first column satisfy the following relationship: 0.5≤d1 / D1≤0.75; The second column dimension E1 and the sidewall extension length F1 satisfy the following relationship: 0.2≤E1 / F1≤0.7; The fillet radius R2 and the distance between the cylinder and the flange F5 satisfy the following relationship: 0.03≤R2 / F5≤0.8; The fillet radius R2 and the distance between the pressure ring and the flange F3 satisfy the following relationship: 0.03≤R2 / F3≤0.8; The battery terminals and battery casing of this invention have the highest insulation resistance, meeting the high insulation safety standards for power batteries.

[0183] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A battery base shell, characterized in that, The battery bottom shell is an integral structure formed by stamping and stretching. The battery bottom shell has an opening and includes a bottom wall, a side wall, and a flange provided at the opening and extending outward. The bottom wall and the side wall are connected by a first rounded corner. The side wall and the flange are connected by a second rounded corner. The height L1 of the sidewall, the length W1 of the flange in its extension direction, the radius R1 of the first fillet and the radius R2 of the second fillet satisfy: (W1*R2) / (L1*R1)<1.

2. The battery base shell according to claim 1, characterized in that, The battery bottom shell is a rectangular thin-walled shell.

3. The battery base shell according to claim 1, characterized in that, The bottom wall is arranged parallel to the flange.

4. The battery base shell according to claim 1, characterized in that, The bottom wall is perpendicular to the extension line of the side wall.

5. The battery base shell according to claim 1, characterized in that, The radius R1 of the first fillet and the radius R2 of the second fillet satisfy: R1 / R2≥1.

6. The battery base shell according to claim 1, characterized in that, The thickness of the sidewall is T1, and the thickness of the first fillet is T2; The second rounded corner includes a first rounded segment, a second rounded segment, and a third rounded segment connected in sequence. The end of the first rounded segment away from the second rounded segment is connected to the sidewall, and the end of the third rounded segment away from the second rounded segment is connected to the flange. The thickness T2 of the first rounded corner, the thickness T3 of the first arc segment, the thickness T4 of the second arc segment, and the thickness T5 of the third arc segment satisfy: (T4*T2) / (T3*T5)<1.

7. The battery base shell according to claim 6, characterized in that, The thickness of the sidewall, T1, and the thickness of the second arc segment, T4, satisfy the condition: 0.4 ≤ T4 / T1 ≤ 1.

8. The battery base shell according to claim 1, characterized in that, The battery casing is made of stainless steel.

9. A battery casing, characterized in that, Includes the battery base as described in any one of claims 1-8.

10. A battery casing assembly, characterized in that, Includes the battery casing as described in claim 9.

11. A battery, characterized in that, Includes the battery housing assembly as described in claim 10.

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