Cell cover and battery

Abstract

The present invention relates to the field of battery technology, and discloses a cell cover plate and a battery, wherein the cell cover plate comprises: a cover plate body, through which a mounting hole is formed; a pole, having a limiting portion directly or indirectly abutted and fixed to one side surface of the cover plate body, a main body step portion connected to the limiting portion and at least partially passing through the mounting hole, and a middle diameter step portion and a top diameter step portion sequentially arranged on a side of the main body step portion away from the limiting portion; a rivet block, riveted to the middle diameter step portion and the top diameter step portion, so that the rivet block directly or indirectly abuts against the other side surface of the cover plate body; along the radial direction of the pole, the diameter of the middle diameter step portion is d2, and the diameter of the top diameter step portion is d3, and 0.05≤(d3‑d2) / d3≤0.5 is satisfied. The cell cover plate provided by the present invention avoids the occurrence of a situation where the tensile resistance performance is deteriorated due to the excessively small load-bearing surface at the top of the pole, effectively ensures the structural strength of the cover plate, and improves the safe use 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 and a battery. Background Art

[0002] With the continuous development of the battery industry, lithium-ion batteries are widely used in the field of power batteries due to their high energy density to provide power for vehicle operation. During the operation of the vehicle, the power battery is subjected to push-pull forces, torque, etc. in all directions, and the working environment requirements are strict. Among them, the cover structure of the battery cell is an important component to ensure the overall strength and safety performance of the battery. The connection strength of the cover structure and the strength of its body are particularly important. However, the connection strength of the cover structure in the prior art is not effectively guaranteed, there is a certain defective rate, and there are safety hazards. Summary of the invention

[0003] In view of this, the present invention provides a battery cover and a battery to solve the problem that the connection strength of the cover structure is not effectively guaranteed and there is a certain defective rate.

[0004] In a first aspect, the present invention provides a battery cell cover plate, comprising:

[0005] The cover plate body is formed with a mounting hole through it;

[0006] The pole comprises a limiting portion directly or indirectly abutted and fixed to one side surface of the cover body, a main body step portion connected to the limiting portion and at least partially passing through the mounting hole, and a middle diameter step portion and a top diameter step portion sequentially arranged on a side of the main body step portion away from the limiting portion;

[0007] A riveting block is riveted with the middle diameter step portion and the top diameter step portion so that the riveting block is directly or indirectly in contact with the other side surface of the cover plate body;

[0008] Along the radial direction of the pole, the diameter of the middle diameter step portion is d2, the diameter of the top diameter step portion is d3, and 0.05≤(d3-d2) / d3≤0.5 is satisfied.

[0009] Beneficial effect: The cell cover provided by the embodiment of the present invention rivets the pole to the cover body through a riveting block, and along the radial direction of the pole, by limiting the lower limit of the difference between the diameter d3 of the top diameter step portion and the diameter d2 of the middle diameter step portion, thereby avoiding the occurrence of a situation where the tensile resistance performance of the top of the pole is too small and the load-bearing surface is too small, and by limiting the upper limit of the difference between the diameter d3 of the top diameter step portion and the diameter d2 of the middle diameter step portion, thereby avoiding the excessive weight caused by the excessive size of the pole, improving the energy density of the battery and avoiding excessive cost. It can effectively ensure the structural strength of the cover and improve the safe use performance of the battery.

[0010] In an optional implementation, along the radial direction of the pole, the diameter of the main body step portion is d1, and satisfies 0.05≤(d1-d2) / d1≤0.5, wherein 4mm≤d1≤20mm, and d1≥d3>d2.

[0011] In an optional embodiment, a rivet hole is axially penetrated inside the rivet block, and a first inner hole portion is formed in an area corresponding to the rivet hole and the middle diameter step portion, and a second inner hole portion is formed in an area corresponding to the rivet hole and the top diameter step portion;

[0012] The inner hole diameter of the first inner hole portion is D1, and satisfies 0.05mm≤D1-d2≤0.5mm;

[0013] The inner hole diameter of the second inner hole portion is D2, and satisfies 0.05 mm≤D2-d3≤0.5 mm.

[0014] In an optional embodiment, the top surface of the top diameter step portion is flush with the top edge of the second inner hole portion; the pole and the riveting block are welded and connected in the area where the top surface of the top diameter step portion contacts the second inner hole portion.

[0015] In an optional embodiment, along the radial direction of the pole, a third inner hole portion is formed in the area where the rivet hole and the pole are not overlapped in the radial projection, and the inner hole diameter of the third inner hole portion is D3, and satisfies 0.8mm≤D3-D2≤4mm, and D3>D2>D1.

[0016] In an optional embodiment, along the radial direction of the riveting hole, the distance from the second inner hole portion to the edge of the riveting block is A.

[0017] And A=(L-D2) / 2 is satisfied, wherein L is the total width of the riveting block along the radial direction of the riveting hole, and the specific size of L satisfies: 10mm≤L≤50mm; the specific size of A satisfies: 2mm≤A≤10mm.

[0018] In an optional embodiment, along the axial direction of the pole, the overlap dimension between the top diameter step portion and the first inner hole region corresponding to the riveting block is B, and satisfies B=(d3-D1) / 2, wherein the specific dimension of B satisfies: 0.25mm≤B≤1mm;

[0019] Along the axial direction of the pole, the overlap dimension between the main body step portion and the first inner hole region of the riveting block corresponding to the main body step portion is C, and satisfies C=(d1-D1) / 2, wherein the specific dimension of C satisfies: 0.3mm≤C≤2mm.

[0020] In an optional embodiment, along the radial direction of the riveting hole, the distance between the edge of the third inner hole portion and the edge of the riveting block is E, and satisfies E=(L-D3) / 2, wherein the specific size of E satisfies: 1.5mm≤E≤6mm.

[0021] In an optional embodiment, along the axial direction of the riveting hole, the total height of the riveting block is H, wherein the specific size of H satisfies: 2mm≤H≤6mm;

[0022] Along the axial direction of the riveting hole, the height difference between the top surface of the riveting block and the top surface of the top diameter step portion is H1, wherein the specific size of H1 satisfies: 0.1mm≤H1≤0.5mm;

[0023] Along the axial direction of the riveting hole, the height of the overlapping area between the top diameter step portion and the second inner hole portion is H2, wherein the specific size of H2 satisfies: 1mm≤H2≤2.5mm;

[0024] Along the axial direction of the riveting hole, the height of the overlapping area between the middle diameter step portion and the first inner hole portion is H3, wherein the specific size of H3 satisfies: 1mm≤H3≤3mm; and H3≥H2>H1.

[0025] In a second aspect, the present invention further provides a battery, comprising the battery cell cover as described above.

[0026] Because the battery includes a cell cover plate, it has the same effect as the cell cover plate, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 It is a three-dimensional schematic diagram of the battery cover plate of the present invention;

[0029] Figure 2 A top view of the battery cover of the present invention;

[0030] Figure 3 for Figure 2 AA cross-section diagram of ;

[0031] Figure 4 is a schematic cross-sectional view of a pole of the present invention;

[0032] Figure 5 It is a cross-sectional schematic diagram of the riveting block of the present invention;

[0033] Figure 6 The cross section of the battery cover Figure 1 ;

[0034] Figure 7 The cross section of the battery cover Figure 2.

[0035] Description of reference numerals:

[0036] 1. Cover plate body; 2. Insulation parts;

[0037] 3. Riveting block; 31. First inner hole portion; 32. Second inner hole portion; 33. Third inner hole portion;

[0038] 4. Pole; 41. Limiting portion; 42. Main body step portion; 43. Middle diameter step portion; 44. Top diameter step portion. DETAILED DESCRIPTION

[0039] 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.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0044] According to an embodiment of the present invention, on the one hand, a battery cell cover is provided, comprising:

[0045] The cover body 1 is formed with a mounting hole;

[0046] The pole 4 has a stopper 41 that is directly or indirectly abutted and fixed to one side surface of the cover body 1, a main body step 42 that is connected to the stopper 41 and at least partially passes through the mounting hole, and a middle diameter step 43 and a top diameter step 44 that are sequentially arranged on a side of the main body step 42 away from the stopper 41;

[0047] The riveting block 3 is riveted with the middle diameter step portion 43 and the top diameter step portion 44, so that the riveting block 3 is directly or indirectly in contact with the other side surface of the cover body 1;

[0048] Along the radial direction of the pole 4 , the diameter of the middle diameter step portion 43 is d2 , the diameter of the top diameter step portion 44 is d3 , and 0.05≤(d3−d2) / d3≤0.5 is satisfied.

[0049] The cell cover provided by the embodiment of the present invention rivets the pole 4 to the cover body 1 through the riveting block 3, and along the radial direction of the pole 4, by limiting the lower limit of the difference between the diameter d3 of the top diameter step 44 and the diameter d2 of the middle diameter step 43, thereby avoiding the occurrence of the situation that the tensile resistance performance is poor due to the small load-bearing surface at the top of the pole 4, and by limiting the upper limit of the difference between the diameter d3 of the top diameter step 44 and the diameter d2 of the middle diameter step 43, thereby avoiding the excessive weight due to the excessive size of the pole 4, improving the energy density of the battery and avoiding excessive cost. It can effectively ensure the structural strength of the cover and improve the safe use performance of the battery.

[0050] Furthermore, by limiting the lower limit of the difference between the diameter d3 of the top diameter step portion 44 and the diameter d2 of the middle diameter step portion 43 , the connection strength of the cover plate structure can be effectively guaranteed and the defective rate can be reduced.

[0051] In this embodiment, the specific range of the difference between the diameter d3 of the top diameter step portion 44 and the diameter d2 of the middle diameter step portion 43 can be 0.5mm≤d3-d2≤5mm; optionally, the difference between the diameter d3 of the top diameter step portion 44 and the diameter d2 of the middle diameter step portion 43 can be 0.5mm or 1mm or 1.5mm or 2mm or 2.5mm or 3mm or 4mm or 4.5mm or 5mm, etc.

[0052] In some embodiments, in combination Figure 4 , Figure 6 As shown, along the radial direction of the pole 4, the diameter of the main body step portion 42 is d1, and satisfies 0.05≤(d1-d2) / d1≤0.5, wherein 4mm≤d1≤20mm, and d1≥d3>d2.

[0053] By limiting the lower limit of the diameter d1 of the main body step 42, the flow area of ​​the pole 4 can be guaranteed, so that the pole meets the overcurrent requirement of the entire battery cell. By limiting the upper limit of the diameter d1 of the main body step 42, the pole 4 is prevented from being too heavy due to being too large, the energy density of the battery is increased, and the cost is avoided from being too high.

[0054] Combination Figure 6 As shown, the diameter d1 of the main body step portion 42 is greater than the diameter d2 of the middle diameter step portion 43. By limiting the lower limit of the difference between the diameter d1 of the main body step portion 42 and the diameter d2 of the middle diameter step portion 43, it is possible to ensure that the bearing area of ​​the main part of the pole 4 is sufficient, avoid the occurrence of poor thrust resistance performance, effectively ensure the structural strength of the cover plate, and improve the safe use performance of the battery. By limiting the upper limit of the difference between the diameter d1 of the main body step portion 42 and the diameter d2 of the middle diameter step portion 43, it is possible to avoid excessive weight caused by excessive size of the pole 4, improve the energy density of the battery, and avoid excessive cost.

[0055] In this embodiment, the specific range of the difference between the diameter d1 of the main step portion 42 and the diameter d2 of the middle diameter step portion 43 can be 0.5mm≤d1-d2≤5mm; optionally, the difference between the diameter d1 of the main step portion 42 and the diameter d2 of the middle diameter step portion 43 can be 0.5mm or 1mm or 1.5mm or 2mm or 2.5mm or 3mm or 4mm or 4.5mm or 5mm, etc.

[0056] In some embodiments, in combination Figure 5 , Figure 6 As shown, a riveting hole is axially penetrated inside the riveting block 3, and a first inner hole portion 31 is formed in an area corresponding to the riveting hole and the middle diameter step portion 43, and a second inner hole portion 32 is formed in an area corresponding to the riveting hole and the top diameter step portion 44;

[0057] The inner diameter of the first inner hole portion 31 is D1, and satisfies 0.05mm≤D1-d2≤0.5mm;

[0058] The inner diameter of the second inner hole portion 32 is D2, and satisfies 0.05 mm ≤ D2 - d3 ≤ 0.5 mm.

[0059] By making the middle diameter step portion 43 with a slightly smaller diameter correspond to the first inner hole portion 31, and at the end away from the cover body 1, making the top diameter step portion 44 with a diameter thicker than the middle diameter step portion 43 correspond to the second inner hole portion 32, the rivet block 3 and the pole 4 are clamped together, and the pole 4 can be fixed by the abutment between the rivet block 3 and the cover body 1.

[0060] Optionally, an insulating member 2 is further provided between the riveting block 3 and the cover body 1 to seal the riveting hole and the through hole, while ensuring insulation between the pole 4 and the cover body 1 .

[0061] By limiting the lower limit of the difference between the inner hole diameter D1 of the first inner hole portion 31 and the diameter d2 of the middle-diameter step portion 43, the situation in which the gap between the riveting block 3 and the pole 4 is too small during the assembly stage, resulting in assembly difficulties, and at the same time, by limiting the upper limit of the difference between the inner hole diameter D1 of the first inner hole portion 31 and the diameter d2 of the middle-diameter step portion 43, the situation in which the riveting material is insufficient due to the gap being too large can be avoided, thereby preventing the overall strength of the pole from being insufficient.

[0062] Optionally, the difference between the inner hole diameter D1 of the first inner hole portion 31 and the diameter d2 of the middle diameter step portion 43 may be 0.05 mm, 0.08 mm, 0.1 mm, 0.22 mm, 0.35 mm, 0.47 mm, 0.5 mm, etc.

[0063] By limiting the lower limit of the difference between the inner hole diameter D2 of the second inner hole portion 32 and the diameter d3 of the top diameter step portion 44, the situation in which the gap between the rivet block 3 and the pole 4 is too small during the assembly stage, resulting in assembly difficulties, and at the same time, by limiting the upper limit of the difference between the inner hole diameter D2 of the second inner hole portion 32 and the diameter d3 of the top diameter step portion 44, the situation in which the gap is too large and affects the welding of the top diameter step portion 44 and the rivet block 3 can be avoided, thereby avoiding the situation in which the internal resistance of the pole is too large.

[0064] Optionally, the difference between the inner hole diameter D2 of the second inner hole portion 32 and the diameter d3 of the top diameter step portion 44 may be 0.05 mm, 0.08 mm, 0.1 mm, 0.22 mm, 0.35 mm, 0.47 mm, 0.5 mm, etc.

[0065] In some embodiments, in combination Figure 3 As shown, the top surface of the top diameter step portion 44 is flush with the top edge of the second inner hole portion 32; the pole 4 and the riveting block 3 are welded and connected in the area where the top surface of the top diameter step portion 44 contacts the second inner hole portion 32. This facilitates the connection between the pole 4 and the riveting block 3.

[0066] In some embodiments, in combination Figure 6 As shown, along the radial direction of the pole 4, a third inner hole portion 33 is formed in the area where the rivet hole and the pole 4 are not overlapped in radial projection. The inner hole diameter of the third inner hole portion 33 is D3, and satisfies 0.8mm≤D3-D2≤4mm, and D3>D2>D1.

[0067] By limiting the lower limit of the difference between the inner hole diameter D3 of the third inner hole portion 33 and the inner hole diameter D2 of the second inner hole portion 32 , it is possible to ensure that the riveting block 3 and the pole 4 have sufficient welding area, thereby ensuring the welding strength.

[0068] Optionally, the difference between the inner hole diameter D3 of the third inner hole portion 33 and the inner hole diameter D2 of the second inner hole portion 32 may be 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, etc.

[0069] In some embodiments, in combination Figure 7 As shown, along the radial direction of the riveting hole, the distance from the second inner hole portion 32 to the edge of the riveting block 3 is A.

[0070] And A=(L-D2) / 2 is satisfied, wherein L is the total width of the riveting block 3 along the radial direction of the riveting hole, and the specific size of L satisfies: 10mm≤L≤50mm; the specific size of A satisfies: 2mm≤A≤10mm.

[0071] Optionally, the total width L of the rivet block 3 along the radial direction of the rivet hole satisfies 10mm≤L≤50mm; by limiting the lower limit of the total width L of the rivet block 3 along the radial direction of the rivet hole, it can be ensured that the rivet block 3 has sufficient area to provide for bar welding.

[0072] By limiting the lower limit of the distance A from the second inner hole 32 to the edge of the riveted block 3, the strength of the cover plate can be ensured, so that the riveted block 3 has a sufficient thickness of the force-bearing surface, and the structure is reliable. By limiting the upper limit of the distance A from the second inner hole 32 to the edge of the riveted block 3, the riveted block 3 is prevented from being too heavy due to its oversized size, the energy density of the battery is improved, and the cost is avoided from being too high.

[0073] Optionally, the distance A from the second inner hole portion 32 to the edge of the riveting block 3 may be 2 mm, 3.5 mm, 4 mm, 5.5 mm, 6 mm, 8 mm, 9 mm, 10 mm, etc.

[0074] In some embodiments, in combination Figure 7 As shown, along the axial direction of the pole 4, the overlap dimension between the top diameter step portion 44 and the first inner hole portion 31 of the riveting block 3 is B, and satisfies B=(d3-D1) / 2, wherein the specific dimension of B satisfies: 0.25mm≤B≤1mm;

[0075] Along the axial direction of the pole 4 , the overlap dimension between the main body step portion 42 and the first inner hole portion 31 of the riveting block 3 is C, and satisfies C=(d1-D1) / 2, wherein the specific dimension of C satisfies: 0.3mm≤C≤2mm.

[0076] By limiting the lower limit of the overlap dimension B between the top diameter step portion 44 and the first inner hole portion 31 of the rivet block 3, the tensile resistance of the pole along the axial direction can be ensured, the structural strength can be ensured, and the loosening of the rivet block 3 caused by excessive force can be avoided.

[0077] Optionally, the value of the overlap dimension B between the top diameter step portion 44 and the first inner hole portion 31 of the riveting block 3 may be 0.25 mm, 0.6 mm, 0.8 mm, 1 mm, etc.

[0078] By limiting the lower limit of the overlap dimension C between the main body step portion 42 and the first inner hole portion 31 of the riveting block 3, the thrust resistance of the pole along the axial direction can be guaranteed, the structural strength can be guaranteed, and the deformation of the riveting block 3 caused by excessive force can be avoided.

[0079] Optionally, the overlap dimension C between the main body step portion 42 and the first inner hole portion 31 of the riveting block 3 may be 0.3 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, etc.

[0080] In some embodiments, in combination Figure 7 As shown, along the radial direction of the riveting hole, the distance between the edge of the third inner hole portion 33 and the edge of the riveting block 3 is E, and satisfies E=(L-D3) / 2, wherein the specific size of E satisfies: 1.5mm≤E≤6mm.

[0081] By limiting the size of the distance E between the edge of the third inner hole portion 33 and the edge of the rivet block 3, the overall strength of the cover plate can be ensured while leaving sufficient welding area for the pole 4 and the rivet block 3. If E is too small, the strength of the rivet block 3 will be insufficient. If E is too large, the welding area between the pole 4 and the rivet block 3 will be insufficient, resulting in poor welding strength.

[0082] Optionally, the distance E between the edge of the third inner hole portion 33 and the edge of the riveting block 3 may be 1.5 mm, 2 mm, 2.3 mm, 2.6 mm, 3 mm, 3.6 mm, 3.9 mm, 4.2 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc.

[0083] In some embodiments, in combination Figure 7 As shown, along the axial direction of the riveting hole, the total height of the riveting block 3 is H, wherein the specific size of H satisfies: 2mm≤H≤6mm;

[0084] Along the axial direction of the riveting hole, the height difference between the top surface of the riveting block 3 and the top surface of the top diameter step portion 44 is H1, wherein the specific size of H1 satisfies: 0.1mm≤H1≤0.5mm;

[0085] Along the axial direction of the riveting hole, the height of the overlapping area between the top diameter step portion 44 and the second inner hole portion 32 is H2, wherein the specific size of H2 satisfies: 1mm≤H2≤2.5mm;

[0086] Along the axial direction of the riveting hole, the height of the overlapping area between the middle diameter step portion 43 and the first inner hole portion 31 is H3, wherein the specific size of H3 satisfies: 1mm≤H3≤3mm; and H3≥H2>H1.

[0087] By limiting the lower limit of the total height H of the riveted block 3, the strength of the riveted block 3 can be ensured, thereby ensuring the overall strength of the cell cover. By limiting the upper limit of the total height H of the riveted block 3, the riveted block 3 can be prevented from being too heavy due to its oversized size, thereby improving the energy density of the battery, avoiding affecting the internal space of the battery, and preventing excessive costs.

[0088] The calculation formula of H may be H=H1+H2+H3.

[0089] Optionally, the total height H of the riveting block 3 may be 2 mm, 2.3 mm, 2.6 mm, 3 mm, 3.6 mm, 3.9 mm, 4.2 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc.

[0090] By limiting the lower limit of the height difference H1 between the top surface of the rivet block 3 and the top surface of the top diameter step 44, it is possible to ensure that there is enough area for welding the rivet block 3 and the pole 4, thereby avoiding the protrusion of the weld affecting the welding of the bar and preventing the occurrence of insufficient overall strength of the battery due to cold welding.

[0091] Optionally, the height difference H1 between the top surface of the riveting block 3 and the top surface of the top diameter step portion 44 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.

[0092] By limiting the lower limit of the height H2 of the overlapping area between the top diameter step portion 44 and the second inner hole portion 32, the tensile strength of the pole 4 and the overall strength of the cover plate can be guaranteed, and the situation of insufficient strength of the cover plate can be avoided. By limiting the upper limit of the height H2 of the overlapping area between the top diameter step portion 44 and the second inner hole portion 32, the rivet block 3 can be prevented from being too heavy due to its oversized size, thereby improving the energy density of the battery and avoiding excessive cost.

[0093] Optionally, the height H2 of the overlapping area between the top diameter step portion 44 and the second inner hole portion 32 may be 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, etc.

[0094] By limiting the lower limit of the height H3 of the overlapping area between the middle diameter step portion 43 and the first inner hole portion 31, the thrust resistance performance of the pole 4 and the overall strength of the cover plate can be guaranteed, and the insufficient strength of the cover plate can be avoided. By limiting the upper limit of the height H3 of the overlapping area between the middle diameter step portion 43 and the first inner hole portion 31, the excessive weight caused by the oversize of the riveting block 3 can be avoided, the energy density of the battery can be improved, and the cost can be avoided.

[0095] Optionally, the value of the height H3 of the overlapping area between the middle-diameter step portion 43 and the first inner hole portion 31 may be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0096] The following will be described in detail with reference to the accompanying drawings and in combination with the embodiments, with emphasis on measuring the key dimensions A, B, and C that affect the push-pull performance of the cover plate and comparing the test results. The test data is detailed in Table 1.

[0097] Example 1: 9 cover plates were selected, and single variable factor comparison tests were performed on the three parameters A, B, and C respectively. The push and pull forces were loaded in a gradient manner with values ​​of 600N, 800N, 1000N, and 1200N, and then helium detection tests were performed. The helium detection leakage rate was <1*10^-7pa.m 3 / s means the test passed.

[0098] Table 1

[0099]

[0100]

[0101] Based on Table 1 above, we can draw the following conclusions:

[0102] 1. Comparing the influence of the size of A on the thrust performance of the cover plate, it is found that the larger the A is, the greater the thrust value the cover plate can withstand. When A is less than 2mm, the thrust of the cover plate cannot meet the general industry requirement of 1000N, so the lower limit value of A is set to 2mm.

[0103] 2. Comparing the effect of B on the cover tension, it is found that B has a greater effect on the cover thrust. The larger B is, the greater the thrust the cover can withstand. When B is less than 0.25mm, the cover thrust cannot meet the industry's general requirement of 1000N, so the lower limit of A is set to 0.25mm.

[0104] 3. Comparing the influence of the size of C on the thrust of the cover, it is found that the size of C has a greater influence on the thrust of the cover. The larger the C is, the greater the thrust the cover can withstand. When C ≥ 0.3mm, the thrust of the cover can meet the general industry requirements of 1000N or even larger, so the lower limit of C is set to 0.3mm.

[0105] The following will refer to the accompanying drawings and combine with the embodiments to measure the key dimensions H2 and H3 that affect the push-pull performance of the cover plate and compare the test results. The test data is detailed in Table 2.

[0106] Example 2: Select 6 cover plates, conduct single variable factor comparison test on H2 and H3 parameters respectively, load push and pull force values ​​of 600N, 800N, 1000N, 1200N in sequence according to the gradient, and then conduct helium detection test, the helium detection leakage rate is less than 1*10^-7pa.m 3 / s means the test passed.

[0107] Table 2

[0108]

[0109] Based on Table 2 above, we can draw the following conclusions:

[0110] 1. Comparing the influence of H2 on the tensile performance of the cover plate, it is found that the larger the H2, the greater the thrust that the cover plate can withstand. When H2 is less than 1.0mm, the thrust of the cover plate cannot meet the general industry requirement of 1000N, so the lower limit of H2 is set to 1.0mm.

[0111] 2. Comparing the influence of H3 on the thrust of the cover, it is found that the size of H3 has a greater influence on the thrust of the cover. The larger the H3, the greater the thrust that the cover can withstand. When H3 is less than 1.0mm, the thrust of the cover cannot meet the general industry requirement of 1000N, so the lower limit of H3 is set to 1.0mm.

[0112] The following will refer to the accompanying drawings and combine with the embodiments to measure the key ratios T1 and T2 that affect the push-pull performance of the cover plate and compare the test results, wherein T1 = (d1-d2) / d1; T2 = (d3-d2) / d3; the test data is detailed in Table 3.

[0113] Example 3: Select 6 cover plates, conduct comparative tests on the two parameters T1 and T2 respectively, load the push and pull forces of 600N, 800N, 1000N, and 1200N in a gradient manner, and then conduct helium detection test. The helium detection leakage rate is <1*10^-7pa.m 3 / s means the test passed.

[0114] Table 3

[0115]

[0116] Based on Table 3 above, we can draw the following conclusions:

[0117] 1. Comparing the influence of T1 on the thrust performance of the cover plate, it is found that the larger T1 is, the greater the thrust the cover plate can withstand. When T1 is less than 0.05, the thrust of the cover plate cannot meet the general industry requirement of 1000N, so the lower limit of T1 is set to 0.05.

[0118] 2. Comparing the effect of T2 on the cover plate tension, it is found that H3 has a greater effect on the cover plate thrust. The larger H3 is, the greater the thrust the cover plate can withstand. When T2 is less than 0.05, the cover plate tension cannot meet the industry's general requirement of 1000N, so the lower limit of T2 is set to 0.05.

[0119] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising the battery cell cover as described above.

[0120] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present invention are 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 all fall within the scope defined by the present invention.

Claims

1. A battery cell cover, characterized in that: include: The cover plate body (1) is formed with a mounting hole therethrough; The pole (4) comprises a limiting portion (41) directly or indirectly abutted and fixed to one side surface of the cover plate body (1), a main body step portion (42) connected to the limiting portion (41) and at least partially passing through the mounting hole, and a middle diameter step portion (43) and a top diameter step portion (44) sequentially arranged on a side of the main body step portion (42) away from the limiting portion (41); A riveting block (3) is riveted to the middle diameter step portion (43) and the top diameter step portion (44), so that the riveting block (3) is in direct or indirect contact with the other side surface of the cover plate body (1); Along the radial direction of the pole (4), the diameter of the middle diameter step portion (43) is d2, the diameter of the top diameter step portion (44) is d3, and 0.05≤(d3-d2) / d3≤0.5 is satisfied; Along the radial direction of the pole (4), the diameter of the main body step portion (42) is d1, and satisfies 0.05≤(d1-d2) / d1≤0.5, wherein 4mm≤d1≤20mm, and d1≥d3>d2.

2. The cell cover plate according to claim 1, characterized in that: A rivet hole is axially penetrated inside the rivet block (3), and a first inner hole portion (31) is formed in an area corresponding to the rivet hole and the middle diameter step portion (43), and a second inner hole portion (32) is formed in an area corresponding to the rivet hole and the top diameter step portion (44); The inner hole diameter of the first inner hole portion (31) is D1, and satisfies 0.05mm≤D1-d2≤0.5mm; The inner hole diameter of the second inner hole portion (32) is D2, and satisfies 0.05mm≤D2-d3≤0.5mm.

3. The cell cover plate according to claim 2, characterized in that: The top surface of the top diameter step portion (44) is flush with the top edge of the second inner hole portion (32); the pole (4) and the riveting block (3) are welded and connected in the area where the top surface of the top diameter step portion (44) contacts the second inner hole portion (32).

4. The cell cover plate according to claim 3, characterized in that: Along the radial direction of the pole (4), a third inner hole portion (33) is formed in an area where the riveting hole and the pole (4) are not overlapped along the radial projection, and the inner hole diameter of the third inner hole portion (33) is D3, and satisfies 0.8mm≤D3-D2≤4mm, and D3>D2>D1.

5. The cell cover plate according to claim 2, characterized in that: Along the radial direction of the riveting hole, the distance from the second inner hole portion (32) to the edge of the riveting block (3) is A. And A=(L-D2) / 2 is satisfied, wherein L is the total width of the riveting block (3) along the radial direction of the riveting hole, and the specific size of L satisfies: 10mm≤L≤50mm; the specific size of A satisfies: 2mm≤A≤10mm.

6. The cell cover plate according to claim 2, characterized in that: Along the axial direction of the pole (4), the overlap dimension between the top diameter step portion (44) and the riveting block (3) corresponding to the first inner hole portion (31) is B, and satisfies B=(d3-D1) / 2, wherein the specific dimension of B satisfies: 0.25mm≤B≤1mm; Along the axial direction of the pole (4), the overlap dimension between the main body step portion (42) and the riveting block (3) corresponding to the first inner hole portion (31) is C, and satisfies C=(d1-D1) / 2, wherein the specific dimension of C satisfies: 0.3mm≤C≤2mm.

7. The cell cover plate according to claim 4, characterized in that: Along the radial direction of the riveting hole, the distance between the edge of the third inner hole portion (33) and the edge of the riveting block (3) is E, and satisfies E=(L-D3) / 2, wherein the specific size of E satisfies: 1.5mm≤E≤6mm.

8. The cell cover plate according to claim 4, characterized in that: Along the axial direction of the riveting hole, the total height of the riveting block (3) is H, wherein the specific size of H satisfies: 2mm≤H≤6mm; Along the axial direction of the riveting hole, the height difference between the top surface of the riveting block (3) and the top surface of the top diameter step portion (44) is H1, wherein the specific size of H1 satisfies: 0.1mm≤H1≤0.5mm; Along the axial direction of the riveting hole, the height of the overlapping area between the top diameter step portion (44) and the second inner hole portion (32) is H2, wherein the specific size of H2 satisfies: 1mm≤H2≤2.5mm; Along the axial direction of the riveting hole, the height of the overlapping area between the middle diameter step portion (43) and the first inner hole portion (31) is H3, wherein the specific size of H3 satisfies: 1mm≤H3≤3mm; and H3≥H2>H1.

9. A battery, characterized in that: It comprises a cell cover as described in any one of claims 1 to 8.

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