Battery cell cover plate and battery

Abstract

The present application relates to the technical field of batteries, and discloses a battery cell cover plate and a battery. The battery cell cover plate comprises: a cover plate body through which a mounting hole is formed; a pole provided with a limiting portion directly or indirectly abutted and fixed to one side surface of the cover plate body, a 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 provided on the side of the body step portion distant from the limiting portion; and a riveting block riveted to the middle-diameter step portion and the top-diameter step portion, so that the riveting block is directly or indirectly abutted against the other side surface of the cover plate body, wherein 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. The battery cover plate provided in the present application avoids the situation where the tensile resistance performance deteriorates due to the excessively small load-bearing surface on the top of the pole, effectively ensures the structural strength of the cover plate, and improves the safe use performance of the battery.

Description

Cell cover and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on December 25, 2023, with application number 202311802092.0 and invention name “Battery Cell Cover and Battery”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0004] With the continuous development of the battery industry, lithium-ion batteries, due to their high energy density, are widely used in the power battery field to provide power for vehicle operation. During vehicle operation, power batteries are subjected to various forces, such as push and pull, and torque, and require strict operating conditions. The cover structure of the battery cell is a key component to ensure the overall strength and safety of the battery. The connection strength of the cover structure and the strength of the cover body are particularly important. However, the connection strength of the cover structure is not effectively guaranteed in the existing technology, resulting in a certain defective rate and posing a safety hazard. Summary of the Invention

[0005] In view of this, the present application provides a cell 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.

[0006] In a first aspect, the present application provides a battery cell cover, comprising:

[0007] The cover body is formed with a mounting hole;

[0008] The pole comprises a stopper portion that is directly or indirectly abutted and fixed to one side surface of the cover body, a main body step portion that is connected to the stopper portion and at least partially passes through the mounting hole, and a middle diameter step portion and a top diameter step portion that are sequentially arranged on a side of the main body step portion away from the stopper portion.

[0009] A rivet block is riveted to the middle diameter step portion and the top diameter step portion, so that the rivet block is in direct or indirect contact with the other side surface of the cover plate body;

[0010] 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.

[0011] Beneficial Effects: The battery cell cover provided by the embodiment of the present application rivets the pole to the cover body via a rivet block. The lower limit of the difference between the diameter d3 of the top diameter step and the diameter d2 of the middle diameter step along the radial direction of the pole is set, thereby preventing the occurrence of poor tensile resistance due to an excessively small load-bearing surface at the top of the pole. Furthermore, the upper limit of the difference between the diameter d3 of the top diameter step and the diameter d2 of the middle diameter step is set, thereby preventing excessive weight due to an oversized pole. This improves the energy density of the battery and avoids excessive cost. This effectively ensures the structural strength of the cover and enhances the safe use of the battery.

[0012] In an optional embodiment, 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.

[0013] 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 middle diameter step portion of the rivet hole, and a second inner hole portion is formed in an area corresponding to the top diameter step portion of the rivet hole;

[0014] The inner hole diameter of the first inner hole portion is D1, and satisfies 0.05mm≤D1-d2≤0.5mm;

[0015] The inner hole diameter of the second inner hole portion is D2, and satisfies 0.05 mm ≤ D2 - d3 ≤ 0.5 mm.

[0016] 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 rivet block are welded together in the area where the top surface of the top diameter step portion contacts the second inner hole portion.

[0017] 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 radial projection of the pole do not overlap, and the inner hole diameter of the third inner hole portion is D3, and satisfies 0.8mm≤D3-D2≤4mm, and D3>D2>D1.

[0018] 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.

[0019] And A=(L-D2) / 2 is satisfied, wherein L is the total width of the rivet block along the radial direction of the rivet hole, and the specific size of L satisfies: 10mm≤L≤50mm; the specific size of A satisfies: 2mm≤A≤10mm.

[0020] 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 of the rivet block is B, and satisfies B=(d3-D1) / 2, wherein the specific dimension of B satisfies: 0.25 mm ≤ B ≤ 1 mm;

[0021] Along the axial direction of the pole, the overlap dimension between the main body step portion and the first inner hole area of ​​the rivet block is C, and satisfies C=(d1-D1) / 2, wherein the specific dimension of C satisfies: 0.3mm≤C≤2mm.

[0022] In an optional embodiment, along the radial direction of the rivet hole, the distance between the edge of the third inner hole portion and the edge of the rivet block is E, and satisfies E=(L-D3) / 2, where the specific size of E satisfies: 1.5mm≤E≤6mm.

[0023] In an optional embodiment, along the axial direction of the rivet hole, the total height of the rivet block is H, wherein the specific size of H satisfies: 2mm≤H≤6mm;

[0024] Along the axial direction of the rivet hole, the height difference between the top surface of the rivet block and the top surface of the top diameter step is H1, wherein the specific size of H1 satisfies: 0.1mm≤H1≤0.5mm;

[0025] 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;

[0026] 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.

[0027] In a second aspect, the present application also provides a battery, comprising the cell cover as described above.

[0028] 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

[0029] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a perspective schematic diagram of a battery cell cover plate of the present application;

[0031] FIG2 is a top view of the battery cell cover of the present application;

[0032] FIG3 is a schematic cross-sectional view taken along line AA of FIG2 ;

[0033] FIG4 is a schematic cross-sectional view of a pole of the present application;

[0034] FIG5 is a cross-sectional schematic diagram of the riveting block of the present application;

[0035] Figure 6 is a cross-sectional view of the battery cover;

[0036] FIG7 is a second cross-sectional view of the battery cell cover.

[0037] Explanation of the accompanying reference numerals: 1. Cover plate body; 2. Insulator; 3. Riveted block; 31. First inner hole portion; 32. Second inner hole portion; 33. Third inner hole portion; 4. Pole; 41. Limiting portion; 42. Main body step portion; 43. Middle diameter step portion; 44. Top diameter step portion. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0039] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0042] The following describes an embodiment of the present application with reference to FIG. 1 to FIG. 7 .

[0043] According to an embodiment of the present application, on one hand, a battery cell cover is provided, comprising:

[0044] The cover body 1 is formed with a mounting hole;

[0045] The pole 4 has a stopper portion 41 that is directly or indirectly abutted and fixed to one side surface of the cover body 1, a main body step portion 42 connected to the stopper 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 provided on a side of the main body step portion 42 away from the stopper portion 41;

[0046] The 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 body 1;

[0047] 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 the relationship 0.05≤(d3−d2) / d3≤0.5 is satisfied.

[0048] The battery cell cover provided by the embodiment of the present application rivets the pole 4 to the cover body 1 via a rivet block 3. In 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, 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 is set, thereby preventing the occurrence of poor tensile resistance due to an excessively small load-bearing surface at the top of the pole 4. Furthermore, 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, 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 is set, thereby preventing the pole 4 from being too large and causing excessive weight, thereby improving the energy density of the battery and avoiding excessive cost. This can effectively ensure the structural strength of the cover and enhance the safe use performance of the battery.

[0049] 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, thereby reducing the defective product rate.

[0050] 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.

[0051] In some embodiments, as shown in FIG4 and FIG6 , along the radial direction of the pole 4 , the diameter of the main step portion 42 is d1 and satisfies 0.05≤(d1-d2) / d1≤0.5, wherein 4mm≤d1≤20mm, and d1≥d3>d2.

[0052] By limiting the lower limit of the diameter d1 of the main body step 42, the flow area of ​​the electrode 4 can be guaranteed, allowing the electrode to meet the overcurrent requirements of the entire battery cell. By limiting the upper limit of the diameter d1 of the main body step 42, the excessive weight caused by the excessive size of the electrode 4 can be avoided, thereby improving the energy density of the battery and avoiding excessive cost.

[0053] As shown in Figure 6 , the diameter d1 of the main step 42 is greater than the diameter d2 of the mid-diameter step 43. By limiting the lower limit of the difference between the diameter d1 of the main step 42 and the diameter d2 of the mid-diameter step 43, the load-bearing area of ​​the main body of the pole 4 can be ensured to be sufficient, avoiding poor thrust resistance, effectively ensuring the structural strength of the cover, and improving the safe use of the battery. By limiting the upper limit of the difference between the diameter d1 of the main step 42 and the diameter d2 of the mid-diameter step 43, the excessive weight caused by the oversize of the pole 4 can be avoided, the energy density of the battery can be improved, and excessive cost can be avoided.

[0054] In this embodiment, the specific range 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 can be 0.5mm≤d1-d2≤5mm; optionally, the difference between the diameter d1 of the main body 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.

[0055] In some embodiments, as shown in FIG5 and FIG6 , a rivet hole is axially penetrated inside the rivet block 3 , and a first inner hole portion 31 is formed in the area corresponding to the middle diameter step portion 43 of the rivet hole, and a second inner hole portion 32 is formed in the area corresponding to the top diameter step portion 44 of the rivet hole;

[0056] The inner diameter of the first inner hole portion 31 is D1, and satisfies 0.05 mm ≤ D1 - d2 ≤ 0.5 mm;

[0057] The inner diameter of the second inner hole portion 32 is D2, and satisfies 0.05 mm ≤ D2 - d3 ≤ 0.5 mm.

[0058] 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 larger 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.

[0059] Optionally, an insulating member 2 is further provided between the rivet block 3 and the cover body 1 to seal the rivet hole and the through hole, while ensuring insulation between the pole 4 and the cover body 1 .

[0060] 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 rivet block 3 and the pole 4 is too small during the assembly stage, resulting in assembly difficulties, can be avoided. 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 insufficiently expanded due to a too large gap can be avoided, thereby preventing the overall strength of the pole from being insufficient.

[0061] 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.

[0062] 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, can be avoided. 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.

[0063] 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 can be 0.05 mm, 0.08 mm, 0.1 mm, 0.22 mm, 0.35 mm, 0.47 mm, 0.5 mm, etc.

[0064] In some embodiments, as shown in FIG3 , the top surface of the top diameter step 44 is flush with the top edge of the second inner hole 32 ; the pole 4 is welded to the rivet block 3 in the area where the top surface of the top diameter step 44 contacts the second inner hole 32 , thereby facilitating the connection between the pole 4 and the rivet block 3 .

[0065] In some embodiments, as shown in FIG6 , a third inner hole portion 33 is formed in the radial direction of the pole 4 in the region where the rivet hole and the radial projection of the pole 4 do not overlap. The inner hole diameter of the third inner hole portion 33 is D3, and satisfies 0.8 mm ≤ D3 - D2 ≤ 4 mm, and D3 > D2 > D1.

[0066] By limiting the lower limit of the difference between the inner diameter D3 of the third inner hole portion 33 and the inner diameter D2 of the second inner hole portion 32 , it is possible to ensure that the rivet block 3 and the pole 4 have sufficient welding area, thereby ensuring welding strength.

[0067] 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.

[0068] In some embodiments, as shown in FIG7 , 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.

[0069] And A=(L-D2) / 2 is satisfied, wherein L is the total width of the rivet block 3 along the radial direction of the rivet hole, and the specific size of L satisfies: 10mm≤L≤50mm; the specific size of A satisfies: 2mm≤A≤10mm.

[0070] 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 is possible to ensure that the rivet block 3 has sufficient area for bar welding.

[0071] By limiting the lower limit of the distance A from the second inner hole 32 to the edge of the rivet block 3, the strength of the cover plate can be guaranteed, and the rivet block 3 has a sufficient thickness of the load-bearing surface, ensuring structural reliability. By limiting the upper limit of the distance A from the second inner hole 32 to the edge of the rivet block 3, the excessive weight caused by the oversize of the rivet block 3 is avoided, the energy density of the battery is improved, and excessive cost is avoided.

[0072] 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.

[0073] In some embodiments, as shown in FIG7 , along the axial direction of the pole 4 , the overlap dimension between the top diameter step 44 and the first inner hole 31 of the rivet block 3 is B, and satisfies B=(d3-D1) / 2, where the specific dimension of B satisfies: 0.25 mm ≤ B ≤ 1 mm;

[0074] 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 rivet block 3 is C, and satisfies C=(d1-D1) / 2, wherein the specific dimension of C satisfies: 0.3mm≤C≤2mm.

[0075] By limiting the lower limit of the overlap dimension B between the top diameter step 44 and the first inner hole 31 of the rivet block 3, the axial tensile strength of the pole can be guaranteed, the structural strength can be guaranteed, and the loosening of the rivet block 3 caused by excessive force can be avoided.

[0076] Optionally, the overlap dimension B between the top diameter step portion 44 and the region of the first inner hole portion 31 of the rivet block 3 may be 0.25 mm, 0.6 mm, 0.8 mm, or 1 mm.

[0077] 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 rivet block 3, the axial thrust resistance of the pole can be guaranteed, the structural strength can be guaranteed, and deformation of the rivet block 3 caused by excessive force can be avoided.

[0078] Optionally, the overlap dimension C between the main body step portion 42 and the first inner hole portion 31 of the rivet block 3 may be 0.3 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, or 2 mm.

[0079] In some embodiments, as shown in FIG7 , along the radial direction of the rivet hole, the distance between the edge of the third inner hole portion 33 and the edge of the rivet block 3 is E, and satisfies E=(L-D3) / 2, wherein the specific size of E satisfies: 1.5 mm≤E≤6 mm.

[0080] By limiting the distance E between the edge of the third inner hole portion 33 and the edge of the rivet block 3, it is possible to ensure the overall strength of the cover 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.

[0081] Optionally, the distance E between the edge of the third inner hole portion 33 and the edge of the rivet block 3 can 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, or 6 mm, etc.

[0082] In some embodiments, as shown in FIG7 , 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: 2 mm ≤ H ≤ 6 mm;

[0083] 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 44 is H1, wherein the specific size of H1 satisfies: 0.1mm≤H1≤0.5mm;

[0084] 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;

[0085] 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.

[0086] By limiting the lower limit of the total height H of the rivet block 3, the strength of the rivet block 3 and, consequently, the overall strength of the cell cover can be guaranteed. By limiting the upper limit of the total height H of the rivet block 3, the excessive weight caused by an oversized rivet block 3 can be avoided, thereby improving the energy density of the battery, avoiding impacting the internal space of the battery, and preventing excessive costs.

[0087] The calculation formula of H may be H=H1+H2+H3.

[0088] Optionally, the total height H of the rivet 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, or 6 mm, etc.

[0089] 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, avoiding the bulge of the weld affecting the welding of the tabs and preventing the occurrence of insufficient overall strength of the battery due to cold welding.

[0090] 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.

[0091] By limiting the lower limit of the height H2 of the overlapping area between the top diameter step 44 and the second inner hole 32, the tensile strength of the terminal 4 and the overall strength of the cover plate can be guaranteed, preventing insufficient cover plate strength. By limiting the upper limit of the height H2 of the overlapping area between the top diameter step 44 and the second inner hole 32, the rivet block 3 can be prevented from being oversized and resulting in excessive weight, thereby improving the energy density of the battery and avoiding excessive costs.

[0092] 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.

[0093] By limiting the lower limit of the height H3 of the overlapping area between the mid-diameter step 43 and the first inner hole 31, the thrust resistance of the terminal 4 and the overall strength of the cover plate can be guaranteed, preventing insufficient cover plate strength. By limiting the upper limit of the height H3 of the overlapping area between the mid-diameter step 43 and the first inner hole 31, the excessive weight caused by oversizing the rivet block 3 can be avoided, thereby improving the energy density of the battery and reducing excessive costs.

[0094] Optionally, 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.

[0095] The following will be explained in detail with reference to the accompanying drawings and in combination with the embodiments, with emphasis on actual measurement of key dimensions A, B, and C that affect the push-pull performance of the cover plate and comparison of test results. The test data is detailed in Table 1.

[0096] Example 1: 9 cover plates were selected and single variable factor comparison tests were performed on the three parameters A, B, and C. The push and pull forces were loaded in a gradient manner of 600N, 800N, 1000N, and 1200N, and then helium detection tests were performed. The helium leakage rate was <1*10 -7 Pa.m 3 / s means the test passed.

[0097] Table 1

[0098] Based on Table 1 above, we can draw the following conclusions:

[0099] 1. Comparing the effect of the size of A on the thrust performance of the cover, it is found that the larger A is, the greater the thrust value the cover can withstand. When A is less than 2mm, the cover thrust cannot meet the industry's general requirement of 1000N, so the lower limit of A is set to 2mm.

[0100] 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.

[0101] 3. Comparing the influence of the size of C on the cover thrust, it is found that the size of C has a greater influence on the cover thrust. The larger C is, the greater the thrust the cover can withstand. When C ≥ 0.3mm, the cover thrust can meet the industry's general requirements of 1000N or even greater, so the lower limit of C is set to 0.3mm.

[0102] 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.

[0103] Example 2: Six cover plates were selected and single variable factor comparison tests were performed on the two parameters H2 and H3. The push and pull forces were loaded in a gradient manner of 600N, 800N, 1000N, and 1200N. Helium detection tests were then performed and the helium leakage rate was <1*10 -7 Pa.m 3 / s means the test passed.

[0104] Table 2

[0105] Based on Table 2 above, we can draw the following conclusions:

[0106] 1. Comparing the effect of H2 on the tensile performance of the cover, it is found that the larger H2 is, the greater the thrust the cover can withstand. When H2 is less than 1.0mm, the thrust of the cover cannot meet the industry's general requirement of 1000N, so the lower limit of H2 is set to 1.0mm.

[0107] 2. Comparing the influence of H3 size on cover thrust, it is found that H3 size has a greater influence on cover thrust. The larger H3 is, the greater the thrust the cover can withstand. When H3 is less than 1.0mm, the cover thrust cannot meet the industry general requirement of 1000N, so the lower limit of H3 is set to 1.0mm.

[0108] 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, where T1 = (d1-d2) / d1; T2 = (d3-d2) / d3; the test data are detailed in Table 3.

[0109] Example 3: Select 6 cover plates and conduct comparative tests on the two parameters T1 and T2 respectively. Then 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 less than 1*10 -7 Pa.m 3 / s means the test passed.

[0110] Table 3

[0111] Based on Table 3 above, we can draw the following conclusions:

[0112] 1. Comparing the effect 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 cover plate thrust cannot meet the industry's general requirement of 1000N, so the lower limit of T1 is set to 0.05.

[0113] 2. Comparing the effect of T2 on the cover plate tension, it is found that H3 has a greater influence 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.

[0114] According to an embodiment of the present application, on the other hand, a battery is provided, comprising the cell cover as described above.

[0115] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present application 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 application, and such modifications and variations are all within the scope defined in the present application.

Claims

1. A battery cell cover plate, characterized in that, Comprising: A cover plate body (1) with a mounting hole formed therethrough; A pole column (4) having a limiting portion (41) that is directly or indirectly in abutting fixation with one side surface of the cover plate body (1), a main body stepped portion (42) connected to the limiting portion (41) and at least partially passing through the mounting hole, and a middle diameter stepped portion (43) and a top diameter stepped portion (44) sequentially arranged on a side of the main body stepped portion (42) away from the limiting portion (41); A riveting block (3) riveted to the middle diameter stepped portion (43) and the top diameter stepped portion (44) so that the riveting block (3) is directly or indirectly in abutment with the other side surface of the cover plate body (1); Along the radial direction of the pole column (4), the diameter of the middle diameter stepped portion (43) is d2, the diameter of the top diameter stepped portion (44) is d3, and 0.05 ≤ (d3 - d2) / d3 ≤ 0.5 is satisfied.

2. The cell cover plate according to claim 1, wherein, Along the radial direction of the pole column (4), the diameter of the main body stepped portion (42) is d1, and 0.05 ≤ (d1 - d2) / d1 ≤ 0.5 is satisfied, where 4 mm ≤ d1 ≤ 20 mm, and d1 ≥ d3 > d2.

3. The cell cover plate according to claim 2, characterized in that, The interior of the riveting block (3) has a riveting hole axially penetrating therethrough, and a first inner hole portion (31) is formed in a region of the riveting hole corresponding to the middle diameter stepped portion (43), and a second inner hole portion (32) is formed in a region of the riveting hole corresponding to the top diameter stepped portion (44); The inner hole diameter of the first inner hole portion (31) is D1, and 0.05 mm ≤ D1 - d2 ≤ 0.5 mm is satisfied; The inner hole diameter of the second inner hole portion (32) is D2, and 0.05 mm ≤ D2 - d3 ≤ 0.5 mm is satisfied.

4. The cell cover plate according to claim 3, wherein, The top surface of the top diameter stepped portion (44) is flush with the top edge of the second inner hole portion (32); the pole column (4) and the riveting block (3) are welded and connected in a region where the top surface of the top diameter stepped portion (44) is in contact with the second inner hole portion (32).

5. The cell cover plate according to claim 4, characterized in that, Along the radial direction of the pole column (4), a third inner hole portion (33) is formed in a region where the riveting hole and the radial projection of the pole column (4) do not overlap, the inner hole diameter of the third inner hole portion (33) is D3, and 0.8 mm ≤ D3 - D2 ≤ 4 mm, and D3 > D2 > D1 is satisfied.

6. The cell cover plate according to claim 3, wherein, 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, where L is the total width of the riveting block (3) along the radial direction of the riveting hole, the specific dimension of L satisfies: 10 mm ≤ L ≤ 50 mm; the specific dimension of A satisfies: 2 mm ≤ A ≤ 10 mm.

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

8. The cell cover plate according to claim 5, wherein, 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 E satisfies E = (L - D3) / 2, where the specific dimension of E satisfies: 1.5 mm ≤ E ≤ 6 mm.

9. The cell cover plate according to claim 5, wherein, Along the axial direction of the riveting hole, the total height of the riveting block (3) is H, where the specific dimension of H satisfies: 2 mm ≤ H ≤ 6 mm; 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, where the specific dimension of H1 satisfies: 0.1 mm ≤ H1 ≤ 0.5 mm; Along the axial direction of the riveting hole, the height of the overlapping region between the top diameter step portion (44) and the second inner hole portion (32) is H2, where the specific dimension of H2 satisfies: 1 mm ≤ H2 ≤ 2.5 mm; Along the axial direction of the riveting hole, the height of the overlapping region between the middle diameter step portion (43) and the first inner hole portion (31) is H3, where the specific dimension of H3 satisfies: 1 mm ≤ H3 ≤ 3 mm; and H3 ≥ H2 > H1.

10. A battery, characterized in that, Including the battery cell cover plate according to any one of claims 1 to 9.

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