Battery cover assembly, battery and power device

Abstract

The present invention relates to the field of battery technology, and discloses a battery cover assembly, a battery and a power device. The battery cover assembly includes a cover body and a pole assembly. The cover body is provided with a mounting hole, and the pole assembly is provided in the mounting hole; the pole assembly includes a pole, a first insulating member and a support ring, and the support ring convex edge of the support ring is welded to the cover body; the weld width between the cover body and the support ring convex edge is E, the weld depth is F, the area of ​​the pole assembly projected along its thickness direction is S, the circumference of the support ring convex edge is S1, and the shear strength of the material selected for the support ring convex edge is τ; the thickness of the cover body is T; the distance between the first step of the mounting hole and the upper end face of the cover body is C; the minimum horizontal distance between the center of the weld and the outer side wall of the first insulating member is K. The present invention enables the welding depth and welding width between the pole assembly and the cover body to meet the preset conditions, can improve the reliability of the weld, ensure that the weld is not easy to be damaged, and improve the safety performance of the battery.

Description

Technical Field

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

[0002] The safety and reliability of lithium-ion batteries have always been the most important issues in the new energy industry.

[0003] In the battery cover assembly, the pole and the cover are welded, but the weld obtained by conventional welding method has poor reliability and is prone to weld damage. Weld damage can cause battery leakage, thereby causing battery safety problems.

[0004] The safety of batteries has always been a top priority. Therefore, it is necessary to improve the weld between the pole and the cover. Summary of the invention

[0005] In view of this, the present invention provides a battery cover plate assembly, a battery and a power device to solve the problem of poor reliability of welding between the pole and the cover plate and easy damage of the weld, which leads to poor battery safety.

[0006] In a first aspect, the present invention provides a battery cover assembly, including a cover body and a pole assembly, the cover body is provided with a mounting hole, the mounting hole is a stepped hole, the mounting hole includes a first step and a second step arranged in the first step; the pole assembly is arranged in the mounting hole, the pole assembly includes a pole, and a first insulating member and a support ring sleeved outside the pole, the support ring includes a support ring body and a support ring convex edge extending outward from the support ring body; the support ring body and the pole are connected at intervals, the support ring convex edge is arranged on the second step, and is welded to the cover body; the weld width between the cover body and the support ring convex edge is E, in mm, the weld depth is F, in mm, and satisfies:

[0007] 13S / 6S 1 τ≤F≤TC-0.5,

[0008] 0.8≤E<2K-2.4,

[0009] in,

[0010] S is the projection area of ​​the pole assembly along its thickness direction, in mm 2 ;

[0011] S 1 is the circumference of the support ring convex edge, in mm;

[0012] τ is the shear strength of the material used for the support ring convex edge, in MPa;

[0013] T is the thickness of the cover body, in mm;

[0014] C is the vertical distance between the first step along the XY plane and the upper end surface of the cover body, in mm;

[0015] K is the minimum horizontal distance between the center of the weld and the outer side wall of the first insulating member, in mm.

[0016] Beneficial effect: The present invention can improve the reliability of the weld by controlling the welding depth and welding width between the pole assembly and the cover plate body, thereby ensuring that the weld is not easily damaged and improving the safety performance of the battery.

[0017] In an optional implementation, the thickness T of the cover plate body satisfies: 1.5≤T≤4.

[0018] In an optional implementation, a vertical distance C between the first step of the mounting hole along the plane where XY is located and the upper end surface of the cover body satisfies: 0.2≤C≤0.5T.

[0019] In an optional implementation, the vertical distance between the plane where the second step is located along XY and the lower end surface of the cover body is A, in mm, satisfying: 0.7≤A≤0.8T.

[0020] In an optional implementation, a vertical distance between a plane where the second step is located along XY and a plane where the first step is located along XY is B, in mm, satisfying: 0.8≤B≤0.8T, A+B+C=T.

[0021] In an optional implementation, the wall thickness of the supporting ring convex edge is D, in mm, satisfying: B-0.15≤D≤B+0.15.

[0022] In an optional embodiment, the shear strength τ of the material selected for the supporting ring convex edge satisfies: τ≥30MPa.

[0023] In an optional implementation, the first insulating member is injection molded between the pole and the support ring to fix the pole and the support ring together.

[0024] In a second aspect, the present invention further provides a battery, comprising a shell, a pole group and a battery cover assembly of any one of the above embodiments, wherein the shell has a containing cavity, and the shell has an open end connected to the containing cavity; the pole group is arranged in the containing cavity of the shell, and the pole group includes a pole ear; the battery cover assembly is arranged at the open end of the shell, and the pole group is encapsulated in the shell, and the pole column of the battery cover assembly and the pole ear of the pole group are conductively connected.

[0025] Beneficial effect: Because the battery includes a battery cover assembly, it has the same effect as the battery cover assembly and will not be described in detail here.

[0026] In a third aspect, the present invention further provides a power device, comprising the battery in the above embodiment.

[0027] Beneficial effect: Since the power device includes a battery, it has the same effect as the battery and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic structural diagram of a battery cover assembly from a first perspective according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure of the cover body and the explosion-proof valve in the battery cover assembly shown;

[0031] Figure 3 for Figure 1 A top view of the battery cover assembly shown;

[0032] Figure 4 For along Figure 3 Sectional view at AA in the middle;

[0033] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0034] Figure 6 for Figure 1 An exploded view of the battery cover assembly shown;

[0035] Figure 7 for Figure 1 A schematic structural diagram of a cover plate body in a battery cover plate assembly from a first perspective;

[0036] Figure 8 for Figure 7 A schematic structural diagram of the cover body from a second viewing angle shown;

[0037] Fig. 9 for Figure 7 A top view of the cover body shown;

[0038] Fig.10 For along Fig. 9 Sectional view at CC;

[0039] Fig.11 for Fig.10 A partial enlarged view of point D in the middle;

[0040] Fig.12 is a schematic diagram of the structure of the support ring;

[0041] Fig.13 for Fig.12 A top view of the support ring is shown;

[0042] Fig.14 For along Fig.13 Sectional view at EE;

[0043] Fig.15 It is a schematic diagram of the structure of a square pole;

[0044] Fig.16 for Fig.15 Schematic diagram of the exploded structure of the square pole shown.

[0045] Description of reference numerals:

[0046] 1. Cover plate body; 101. Mounting hole; 1011. First step; 1012. Second step; 2. Pole; 3. First insulating member; 4. Support ring; 401. Support ring body; 402. Support ring convex edge; 5. Second insulating member; 6. Explosion-proof valve; 7. Explosion-proof valve protective film; 8. Sealing ring. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0048] Combine the following Figures 1 to 16 , describing an embodiment of the present invention.

[0049] According to an embodiment of the present invention, in the first aspect, a battery cover assembly is provided, including a cover body 1 and a pole assembly. A mounting hole 101 is provided on the cover body 1, and the mounting hole 101 is a stepped hole, and the mounting hole 101 includes a first step 1011 and a second step 1012 arranged inside the first step 1011; the pole assembly is arranged in the mounting hole 101; the pole assembly includes a pole 2 and a first insulating member 3 and a support ring 4 arranged outside the pole 2. The support ring 4 includes a support ring body 401 and a support ring flange 402 extending outward from the support ring body 401; the support ring body 401 is connected to the pole 2 at intervals, and the support ring flange 402 is arranged on the second step 1012 and welded to the cover body 1; the weld width between the cover body 1 and the support ring flange 402 is E, in mm, and the weld depth is F, in mm, which satisfies:

[0050] 13S / 6S 1 τ≤F≤TC-0.5,

[0051] 0.8≤E<2K-2.4,

[0052] in,

[0053] S is the projection area of ​​the pole assembly along its thickness direction, in mm 2 ;

[0054] S 1 is the circumference of the supporting ring convex edge 402, in mm;

[0055] τ is the shear strength of the material selected for the support ring flange 402, in MPa;

[0056] T is the thickness of the cover body 1, in mm;

[0057] C is the vertical distance between the first step 1011 and the upper end surface of the cover body 1 along the XY plane, in mm;

[0058] K is the minimum horizontal distance between the center of the weld and the outer side wall of the first insulating member 3, in mm.

[0059] Specifically, the melt width refers to the lateral width of the molten metal of the welding wire or welding rod during welding. In this embodiment, the melt width refers to the lateral width of the melted cover body 1 when the cover body 1 and the support ring convex edge 402 are welded. The penetration depth refers to the longitudinal depth of the molten metal of the welding wire or welding rod during welding. In this embodiment, the penetration depth refers to the longitudinal depth of the melted cover body 1 when the cover body 1 and the support ring convex edge 402 are welded.

[0060] If the weld penetration F is too small, the weld strength will be insufficient; if the weld penetration F is too large, the supporting part of the cover body 1 will be greatly deformed, affecting the assembly of the second insulating member 5.

[0061] If the weld molten width E is too small, the weld molten width will be insufficient, which may easily cause the weld to break during use and have low reliability. If the weld molten width E is too large, the first insulating member 3 may be partially melted, affecting the assembly between the pole 2 and the support ring 4, and easily causing insulation failure between the pole 2 and the support ring 4 and low reliability.

[0062] This embodiment can improve the reliability of the weld by controlling the weld penetration F and the weld width E between the pole assembly and the cover plate body 1, thereby ensuring that the weld is not easily damaged and improving the safety performance of the battery.

[0063] As for controlling the size of the weld width E and the size of the weld depth F, the size of the weld width E and the weld depth F can be controlled within the above-mentioned range by controlling factors such as voltage, current and welding speed.

[0064] For orientation, specifically, Figure 2 In the figure, the direction indicated by X is the length direction of the cover body 1, the direction indicated by Y is the width direction of the cover body 1, and the direction indicated by Z is the thickness direction of the cover body 1. When the pole is a circular structure, the direction X is the radial direction of the pole, and the direction Z is the axial direction of the pole.

[0065] Specifically, the shape of the support ring 4 is adapted to the shape of the pole. For a circular pole 2, the support ring 4 is a circular ring, the support ring body 401 extends in the axial direction, and the support ring convex edge 402 extends in the radial direction. When the support ring 4 and the cover plate body 1 are assembled, the support ring convex edge 402 is arranged in the second step 1012 of the mounting hole 101. When welding, the joint between the support ring convex edge 402 and the mounting hole 101 is welded. For a square pole, the support ring 4 is also a rectangular ring.

[0066] In some embodiments, the first insulating member 3 is formed between the pole 2 and the support ring 4 by injection molding to fix the pole 2 and the support ring 4. Specifically, after the pole 2 and the support ring 4 are assembled, injection molding is performed to form the first insulating member 3. While the first insulating member 3 is formed, the pole 2 and the support ring 4 are also fixedly connected as a whole. The first insulating member 3 is an annular structure, and further, the first insulating member 3 includes a plastic ring.

[0067] The pole 2 , the first insulating member 3 and the supporting ring 4 are integrally formed, and the pole assembly can form an independent member, which greatly improves the assembly efficiency between the pole 2 and the cover body 1 .

[0068] In some embodiments, the thickness T of the cover body 1 satisfies: 1.5≤T≤4.

[0069] By controlling the thickness T of the cover plate body 1 within this range, the strength of the cover plate body 1 can be ensured and the cover plate body 1 is not easily deformed during welding.

[0070] In some embodiments, a vertical distance C between the first step 1011 of the mounting hole 101 and the upper end surface of the cover body 1 along the plane where XY is located satisfies: 0.2≤C≤0.5T.

[0071] If the vertical distance C between the first step 1011 and the upper end surface of the cover body 1 along the plane where XY is located is too small, the weld will protrude from the surface of the cover body 1, resulting in a poor appearance. Since the thickness T of the cover body 1 is fixed, when the vertical distance C between the first step 1011 and the upper end surface of the cover body 1 along the plane where XY is located is too large, the vertical distance A between the second step 1012 and the lower end surface of the cover body 1 along the plane where XY is located will be too small, resulting in the cover body 1 being insufficient to support the support ring 4.

[0072] In some embodiments, the vertical distance between the second step 1012 along the XY plane and the lower end surface of the cover body 1 is A, in mm, satisfying: 0.7≤A≤0.8T.

[0073] If the vertical distance A between the second step 1012 along the XY plane and the lower end surface of the cover body 1 is too small, the cover body 1 will be penetrated during welding, causing air leakage in the cover body 1, or causing significant deformation of the supporting part of the cover body 1, affecting the assembly of the connecting piece; if the vertical distance A between the second step 1012 along the XY plane and the lower end surface of the cover body 1 is too large, the welding thickness between the support ring 4 and the cover body 1 will be insufficient, resulting in low welding strength and low reliability of the cover body 1.

[0074] In some embodiments, a vertical distance between the second step 1012 along the XY plane and the first step 1011 along the XY plane is B, in mm, satisfying: 0.8≤B≤0.8T, A+B+C=T.

[0075] The sum of the vertical distance C between the plane where the first step 1011 is located along XY and the upper end face of the cover body, the vertical distance B between the plane where the second step 1012 is located along XY and the plane where the first step 1011 is located along XY, and the vertical distance A between the plane where the second step 1012 is located along XY and the lower end face of the cover body 1 is the thickness T of the cover body 1. If the vertical distance B between the plane where the second step 1012 is located along XY and the plane where the first step 1011 is located along XY is too small, the thickness of the support ring 4 will be low, the rigidity of the support ring 4 will be weak, it will be easy to deform, and the reliability of use will be low; if the vertical distance B between the plane where the second step 1012 is located along XY and the plane where the first step 1011 is located along XY is too large, the thickness of the support ring 4 will be large, the support ring 4 will not be easy to stamp and the processing cost will be high.

[0076] In some embodiments, the wall thickness of the support ring 4 is D, in mm, satisfying: B-0.15≤D≤B+0.15.

[0077] By controlling the wall thickness D of the support ring 4 within this range, the welding yield rate can be improved and welding problems such as weld deviation and cracking points can be avoided.

[0078] In some embodiments, the shear strength τ of the material selected for the support ring flange 402 satisfies: τ≥30 MPa. In this embodiment, that is, the shear strength τ of the material selected for the support ring 4 satisfies: τ≥30 MPa.

[0079] The shear strength τ of the material selected for the support ring 4 is controlled within a range greater than or equal to 30 MPa, and the support ring 4 has sufficient strength to ensure that the battery can pass the 1.3 MPa pressure test.

[0080] In some embodiments, the battery cover assembly further includes a second insulating member 5 , which is connected to a side of the cover body 1 facing the electrode group.

[0081] In some embodiments, a sealing ring 8 is further included. The sealing ring 8 is arranged between the pole assembly and the mounting hole to achieve a sealed connection.

[0082] In some embodiments, the cover body 1 is provided with two mounting holes 101, the pole 2 includes a positive pole and a negative pole, and the two mounting holes 101 are used to mount the positive pole and the negative pole respectively. The positive pole and the negative pole have the same structure, so the connection structure between the positive pole and the mounting hole 101 is the same as the connection structure between the negative pole and the mounting hole 101.

[0083] In some embodiments, an explosion-proof valve 6 is further provided on the cover body 1 , and an explosion-proof valve protective film 7 is provided on the explosion-proof valve 6 .

[0084] The following provides eight groups of specific experimental cases, see Tables 1 to 8.

[0085] Table 1:

[0086]

[0087] For Implementation Cases 1 to 8 in Table 1, the weld width E is required to satisfy: 0.8≤E<2K-2.4, that is, 0.8mm≤E<3.6mm.

[0088] For implementation cases 1 to 6 and implementation case 8 in Table 1, the required penetration depth F is: 13S / 6S 1 τ≤F≤TC-0.5, that is, 0.26mm≤F≤1.3mm.

[0089] For implementation case seven, the penetration depth F is required to meet the following requirements: 0.217 mm ≤ F ≤ 1.3 mm.

[0090] As can be seen from Table 1, in Implementation Case 1, the weld width E=0.65mm, which is less than the lower limit of E of 0.8mm. The weld width is insufficient, which may easily cause weld breakage during use and has low reliability.

[0091] As can be seen from Table 1, in Implementation Case 7, the weld width E=3.6mm, and the value of 2K-2.4-E is zero, that is, E is not less than its upper limit value 2K-2.4, and the first insulating member 3 is partially melted, which affects the assembly between the pole 2 and the support ring 4, and easily causes insulation failure between the pole 2 and the support ring 4, and has low reliability.

[0092] As can be seen from Table 1, in the implementation case 3, the melting depth F = 0.1mm, which is less than the lower limit of F 0.26mm, F-(13S) / (6S 1 The value of τ) is negative, resulting in failure of the 1.3MPa pressure test and insufficient weld strength.

[0093] As can be seen from Table 1, in Implementation Case 8, the penetration depth F=1.5mm, and the value of TC-0.5-F is negative, that is, F is greater than its upper limit of 1.3mm, the penetration depth is deep, and the supporting part of the cover body 1 is greatly deformed, affecting the assembly of the second insulating member 5.

[0094] Table 2:

[0095]

[0096] For implementation cases 9 to 16 in Table 2, the weld width E is required to satisfy: 0.8≤E<2K-2.4, that is, 0.8mm≤E<3.6mm.

[0097] For implementation cases 9 to 14 and implementation case 16 in Table 2, the required penetration depth F is: 13S / 6S 1 τ≤F≤TC-0.5, that is, 0.26mm≤F≤0.8mm.

[0098] For implementation case 15, the penetration depth F is required to meet the following requirements: 0.217 mm ≤ F ≤ 0.8 mm.

[0099] It can be seen from Table 2 that in Implementation Case 9, the weld width E=0.65mm, which is less than the lower limit of E of 0.8mm. The weld width is insufficient, which may easily cause weld breakage during use and has low reliability.

[0100] It can be seen from Table 2 that in Implementation Case 15, the weld width E=3.6mm, and the value of 2K-2.4-E is zero, that is, E is not less than its upper limit value 2K-2.4, and the first insulating member 3 is partially melted, which affects the assembly between the pole 2 and the support ring 4, and easily causes insulation failure between the pole 2 and the support ring 4, and has low reliability.

[0101] As can be seen from Table 2, in the implementation case 11, the melting depth F = 0.1mm, F-(13S) / (6S 1 The value of τ) is negative, that is, F is less than the lower limit of 0.26mm, resulting in failure of the 1.3MPa pressure test and insufficient weld strength.

[0102] It can be seen from Table 2 that in Implementation Case 16, the melting depth F=1mm, and the value of TC-0.5-F is negative, that is, F is greater than its upper limit of 0.8mm, the melting depth is deep, and the supporting part of the cover body 1 is greatly deformed, affecting the assembly of the second insulating member 5.

[0103] Table 3:

[0104]

[0105] For implementation cases 17 to 24 in Table 3, the weld width E is required to satisfy: 0.8≤E<2K-2.4, that is, 0.8mm≤E<3.6mm.

[0106] For implementation cases 17 to 22 and implementation case 24 in Table 3, the required penetration depth F is: 13S / 6S 1 τ≤F≤TC-0.5, that is, 0.26mm≤F≤2.3mm.

[0107] For Implementation Case 23, the penetration depth F is required to satisfy: 0.217mm≤F≤2.3mm.

[0108] It can be seen from Table 3 that in Implementation Case 17, the weld width E=0.65mm, which is less than the lower limit of E of 0.8mm. The weld width is insufficient, which may easily cause weld breakage during use and has low reliability.

[0109] It can be seen from Table 3 that in Implementation Case 23, the weld width E=3.6mm, and the value of 2K-2.4-E is negative, that is, E is not less than its upper limit value 2K-2.4, and the first insulating member 3 is partially melted, which affects the assembly between the pole 2 and the support ring 4, and easily causes insulation failure between the pole 2 and the support ring 4, and has low reliability.

[0110] As can be seen from Table 3, in the implementation case 19, the melting depth F = 0.1mm, F-(13S) / (6S 1The value of τ) is negative, that is, F is less than the lower limit of 0.26mm, resulting in failure of the 1.3MPa pressure test and insufficient weld strength.

[0111] It can be seen from Table 3 that in Implementation Case 24, the melting depth F=2.5mm, and the value of TC-0.5-F is negative, that is, F is greater than its upper limit of 2.3mm, the melting depth is deep, and the supporting part of the cover body 1 is greatly deformed, affecting the assembly of the second insulating member 5.

[0112] Table 4:

[0113]

[0114] For implementation cases 25 to 32 in Table 4, the weld width E is required to satisfy: 0.8≤E<2K-2.4, that is, 0.8mm≤E<3.6mm.

[0115] For implementation cases 25 to 30 and implementation case 32 in Table 4, the required penetration depth F is: 13S / 6S 1 τ≤F≤TC-0.5, that is, 0.26mm≤F≤0.8 mm.

[0116] For Implementation Case 31, the penetration depth F is required to satisfy: 0.217mm≤F≤0.8mm.

[0117] It can be seen from Table 4 that in Implementation Case 25, the weld width E=0.65mm, which is less than the lower limit of E of 0.8mm. The weld width is insufficient, which may easily cause weld breakage during use and has low reliability.

[0118] It can be seen from Table 4 that in Implementation Case 31, the weld width E=3.6mm, and the value of 2K-2.4-E is zero, that is, E is not less than its upper limit value 2K-2.4, resulting in partial melting of the first insulating member 3, affecting the assembly between the pole 2 and the support ring 4, and easily causing insulation failure between the pole 2 and the support ring 4, and low reliability.

[0119] From Table 4, it can be seen that in the implementation case 27, the melting depth F = 0.1mm, F-(13S) / (6S 1 The value of τ) is negative, that is, F is less than the lower limit of 0.26mm, resulting in failure of the 1.3MPa pressure test and insufficient weld strength.

[0120] It can be seen from Table 4 that in Implementation Case 32, the melting depth F=3.5mm, and the value of TC-0.5-F is negative, that is, F is greater than its upper limit of 3.3mm. The melting depth is deep, resulting in a large deformation of the supporting part of the cover body 1, affecting the assembly of the second insulating member 5.

[0121] Combining Tables 1 to 4, it can be concluded that the penetration depth F and the penetration width E of the welding between the support ring 4 and the cover plate body 1 are controlled at 13S / 6S respectively. 1 In the range of τ≤F≤TC-0.5 and 0.8≤E<2K-2.4, the strength of the weld can be ensured, the stability of the welding between the pole 2 and the cover body 1 can be ensured, and the safety performance of the battery can be improved.

[0122] Table 5:

[0123]

[0124] It can be seen from Table 5 that in Implementation Case 35, the shear strength τ of the material selected for the support ring 4 is 10MPa, which is lower than the lower limit of 30MPa. The shear strength of the material of the support ring 4 is low, resulting in failure of the 1.3MPa pressure test. In other implementation cases, while ensuring that the penetration depth F and the penetration width E are within the specified range, τ≥30MPa and the 1.3MPa pressure test are all passed.

[0125] Table 6:

[0126]

[0127] It can be seen from Table 6 that in Implementation Case 41, the shear strength τ of the material selected for the support ring 4 is 10MPa, which is lower than the lower limit of 30MPa. The shear strength of the material of the support ring 4 is low, resulting in failure of the 1.3MPa pressure test. In other implementation cases, while ensuring that the penetration F and the penetration width E are within the specified range, τ≥30MPa and the 1.3MPa pressure test are all passed.

[0128] Table 7:

[0129]

[0130] It can be seen from Table 7 that in Implementation Case 47, the shear strength τ of the material selected for the support ring 4 is 10MPa, which is lower than the lower limit of 30MPa. The shear strength of the material of the support ring 4 is low, resulting in failure of the 1.3MPa pressure test. In other implementation cases, when the penetration depth F and the penetration width E are within the specified range, τ≥30MPa and the 1.3MPa pressure test are all passed.

[0131] Table 8:

[0132]

[0133] It can be seen from Table 8 that in Implementation Case 53, the shear strength τ of the material selected for support ring 4 is 10MPa, which is lower than the lower limit of 30MPa. The shear strength of the material of support ring 4 is low, resulting in failure of the 1.3MPa pressure test. In other implementation cases, τ≥30MPa and 1.3MPa pressure tests are all passed while ensuring that the penetration depth F and the penetration width E are within the specified range.

[0134] According to an embodiment of the present invention, in a second aspect, a battery is further provided, comprising a shell, a pole group, and a battery cover assembly of any one of the above embodiments. The shell has a receiving cavity, and the shell has an open end connected to the receiving cavity; the pole group is arranged in the receiving cavity of the shell, and the pole group includes a pole ear; the battery cover assembly is arranged at the open end of the shell, and the pole group is encapsulated in the shell, and the pole column 2 of the battery cover assembly is conductively connected to the pole ear of the pole group.

[0135] Since the battery in this embodiment includes the battery cover assembly in the above embodiment, it has all the beneficial effects of the above battery cover assembly, which will not be described in detail here.

[0136] According to an embodiment of the present invention, in a third aspect, a power device is also provided, comprising the battery in the above embodiment.

[0137] Since the power device in this embodiment includes the battery in the above embodiment, it has the same beneficial effects as the battery, which will not be described in detail here.

[0138] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate body, wherein the cover plate body is provided with a mounting hole, wherein the mounting hole is a stepped hole, and the mounting hole comprises a first step and a second step provided inside the first step; A pole assembly, the pole assembly is arranged in the mounting hole, the pole assembly includes a pole, and a first insulating member and a support ring sleeved outside the pole, the support ring includes a support ring body and a support ring convex edge extending outward from the support ring body; the support ring body and the pole are connected with each other at intervals, the support ring convex edge is arranged on the second step, and is welded to the cover plate body; The weld width between the cover plate body and the support ring convex edge is E, in mm, and the weld depth is F, in mm, which satisfies: 13S / 6S1τ≤F≤TC-0.5, 0.8≤E<2K-2.4, in, S is the projection area of ​​the pole assembly along its thickness direction, in mm 2 ; S1 is the circumference of the convex edge of the support ring, in mm; τ is the shear strength of the material selected for the support ring convex edge, in MPa; T is the thickness of the cover body, in mm; C is the vertical distance between the first step and the upper end surface of the cover body along the XY plane, in mm; K is the minimum horizontal distance between the center of the weld and the outer side wall of the first insulating member, in mm; The thickness T of the cover plate body satisfies: 1.5≤T≤4; The vertical distance C between the plane where the first step of the mounting hole is located along XY and the upper end surface of the cover body satisfies: 0.2≤C≤0.5T; The shear strength τ of the material selected for the support ring convex edge satisfies: τ≥30MPa.

2. The battery cover assembly according to claim 1, characterized in that: The vertical distance between the plane where the second step is located along XY and the lower end surface of the cover body is A, in mm, and satisfies: 0.7≤A≤0.8T.

3. The battery cover assembly according to claim 2, characterized in that: A vertical distance between a plane where the second step is located along XY and a plane where the first step is located along XY is B, in mm, satisfying: 0.8≤B≤0.8T, A+B+C=T.

4. The battery cover assembly according to claim 3, characterized in that: The wall thickness of the support ring convex edge is D, in mm, satisfying: B-0.15≤D≤B+0.

15.

5. The battery cover assembly according to claim 1, characterized in that: The first insulating member is injection-molded between the pole and the support ring to fixedly connect the pole and the support ring.

6. A battery, characterized in that: include: A shell, the shell having a receiving cavity, the shell having an open end communicating with the receiving cavity; A pole group, the pole group is arranged in the accommodating cavity of the shell, and the pole group includes a pole ear; The battery cover assembly according to any one of claims 1 to 5, wherein the battery cover assembly is arranged at the open end of the shell, the electrode group is encapsulated in the shell, and the electrode column of the battery cover assembly is conductively connected to the electrode lug of the electrode group.

7. A power device, characterized in that: Comprising the battery as claimed in claim 6.

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