Battery and cover plate assembly thereof

Abstract

The invention relates to the technical field of batteries, and discloses a battery and a cover plate assembly thereof, and the cover plate assembly is characterized in that a cover plate is provided with a mounting hole; the pole comprises a pole body and a flanging part, the pole body is arranged in the mounting hole in a penetrating manner, the flanging part is connected with the cover plate, and the flanging part is arranged on the pole body in a surrounding manner; the clamping plate surrounds the peripheral side of the pole body, and the clamping plate and the peripheral side of the pole body are welded to form a welding part; the sealing element is arranged on the peripheral side of the pole body in a surrounding manner, the sealing element is clamped by the flanging part and the cover plate, and the projection of the sealing element on the cover plate is partially overlapped with the projection of the flanging part on the cover plate; wherein the width of the flanging part is d1mm, the thickness of the flanging part is t1mm, the width of the sealing element is d2mm, the compression amount of the sealing element is C mm, and (d1 * t1) / (d2 * C) is larger than or equal to 0.5 and smaller than or equal to 15. According to the invention, the flanging part can be prevented from being deformed due to pressing applied by the sealing element, so that the risks of sealing failure of the pole and tearing deformation of the welding part are reduced.

Description

Technical Field

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

[0002] At present, in the battery structure, the battery pole will pass through the battery cover, and a flange is set on the side of the pole facing the inside of the battery, and the pole is fixed by riveting the flange. A seal is set between the cover and the flange, and the seal is used to seal the gap between the cover and the pole. The seal will apply pressure to the flange, causing the flange to deform or the pole to arch up, which is not conducive to the overall structural safety of the battery. Summary of the invention

[0003] The object of the present invention is to provide a battery and a cover plate assembly thereof, which can ensure the anti-extrusion performance of the flange to improve the safety of the overall structure of the battery.

[0004] In order to achieve the above object, the present invention provides a battery cover assembly, comprising: A cover plate, which is provided with a mounting hole, wherein the mounting hole penetrates the cover plate along the thickness direction of the cover plate; A pole, comprising a pole body and a flange portion, wherein the pole body is inserted into the mounting hole, and the flange portion is disposed around the outer circumference of the pole body; A clamping plate, which surrounds the outer circumference of the pole body, and the clamping plate is welded to the outer circumference of the pole body to form a welding portion, the projection of the clamping plate on the cover plate at least partially overlaps with the projection of the flange portion on the cover plate, and the clamping plate and the flange portion can clamp the cover plate to limit the cover plate; A sealing member, which is disposed around the outer circumference of the pole body, and at least a portion of the sealing member is disposed between the flange portion and the cover plate, the flange portion and the cover plate clamp the sealing member, and a projection of the sealing member on the cover plate partially overlaps with a projection of the flange portion on the cover plate; Wherein, the width of the flange portion is d 1 mm, the thickness of the flanged portion is t 1 mm, the width of the seal is d 2 mm, the compression amount of the seal is C mm, satisfying: 0.5≤(d 1 *t 1 ) / (d 2 *C)≤15, wherein the width of the flange portion is the distance between the outer circumference and the inner circumference of the flange portion in a direction perpendicular to the thickness of the cover plate, the thickness of the flange portion is the size of the flange portion in the thickness direction of the cover plate, and the width of the seal is the distance between the outer circumference and the inner circumference of the seal in a direction perpendicular to the thickness of the cover plate.

[0005] The present invention also provides a battery, comprising the above-mentioned cover plate assembly.

[0006] The present invention provides a battery and a cover plate assembly thereof, which have the following beneficial effects compared with the prior art: The cover plate assembly of the battery of the present invention comprises a cover plate, a pole, a clamp and a seal. The pole comprises a pole body through which the cover plate is passed and a flange portion sleeved on the pole body. The clamp is welded to the pole body to form a welding portion. The seal is arranged between the cover plate and the flange portion. By limiting the size relationship between the flange portion and the seal, the anti-extrusion performance of the flange portion can be ensured, and the flange portion can be prevented from being deformed due to the pressure applied by the seal, thereby reducing the risk of pole seal failure and tearing deformation of the welding portion, thereby improving the safety of the overall structure of the battery.

[0007] The battery of the present invention includes the above-mentioned cover plate assembly, which can ensure the anti-extrusion performance of the flange portion and prevent the flange portion from being deformed due to the pressure applied by the seal, thereby reducing the risk of pole seal failure and tearing deformation of the welding portion, thereby improving the safety of the overall battery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic diagram of the structure of the cover plate assembly according to an embodiment of the present invention.

[0009] Figure 2 yes Figure 1 Disassembly diagram of the middle cover assembly.

[0010] Figure 3 yes Figure 1 Section view in AA direction.

[0011] Figure 4 yes Figure 3 A magnified schematic diagram of point B in the middle.

[0012] In the figure, 1, cover plate; 2, pole; 3, clamping plate; 4, sealing member; 21, pole body; 22, flange portion; 23, pole portion; 24, transition portion; 311, groove; 41, flat plate portion; 42, vertical portion. DETAILED DESCRIPTION

[0013] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0014] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 operate 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.

[0015] 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.

[0016] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0017] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] Please refer to Figure 1 and Figure 2 A battery cover assembly according to a preferred embodiment of the present invention includes: a cover 1, a pole 2, a clamping plate 3 and a sealing member 4.

[0019] The cover plate 1 is provided with a mounting hole, and the mounting hole penetrates the cover plate 1 along the thickness direction of the cover plate 1 .

[0020] The cover plate 1 is a cover plate 1 of a single cell. The single cell further comprises a shell. A battery cell is arranged inside the shell. The cover plate 1 is covered on the shell.

[0021] The pole 2 includes a pole body 21 and a flange portion 22 . The pole body 21 is inserted into the mounting hole. The flange portion 22 is connected to the cover plate 1 . The flange portion 22 is disposed around the outer circumference of the pole body 21 .

[0022] The electrode column 2 is used to electrically connect the battery cell to external equipment. The electrode column 2 is divided into a positive electrode column 2 and a negative electrode column 2 with different polarities. Each battery can have multiple positive electrode columns 2 or negative electrode columns 2. In this embodiment, one positive electrode column 2 and one negative electrode column 2 are provided. In specific production implementation, the number and position of the electrode column 2 can be set as needed.

[0023] It should be noted here that the flange portion 22 is indirectly connected to the cover plate 1, because the flange portion 22 also needs to be connected to the pole ear of the battery cell, and the indirect connection with the cover plate 1 can prevent the battery from leaking.

[0024] The clamping plate 3 surrounds the outer peripheral side of the pole body 21, and the clamping plate 3 is welded to the outer peripheral side of the pole body 21 to form a welding portion. The clamping plate 3 and the flange portion 22 are respectively located on both sides of the plate surface of the cover plate 1. The projection of the clamping plate 3 on the cover plate 1 at least partially overlaps with the projection of the flange portion 22 on the cover plate 1. The clamping plate 3 and the flange portion 22 can clamp the cover plate 1 to limit the cover plate 1.

[0025] After the pole 2 passes through the cover plate 1 , the clamping plate 3 is required to provide support for the pole 2 .

[0026] The welding part is formed after the pole 2 and the clamping plate 3 are welded and the molten pool is cooled. A part of the welding part is on the clamping plate 3, and a part is on the pole 2.

[0027] The seal 4 is arranged around the outer circumference of the pole body 21, and at least a part of the seal 4 is arranged between the flange portion 22 and the cover plate 1. The flange portion 22 and the cover plate 1 clamp the seal 4, and the projection of the seal 4 on the cover plate 1 partially overlaps with the projection of the flange portion 22 on the cover plate 1.

[0028] The flange portion 22 and the cover plate 1 clamp the seal 4 to deform the seal 4 , thereby sealing the gap between the cover plate 1 and the flange portion 22 to prevent leakage at the pole 2 .

[0029] Please refer to Figure 3 and Figure 4 The distance between the outer circumference and the inner circumference of the flange portion 22 in the direction perpendicular to the thickness of the cover plate 1 is d 1 mm, that is, the width of the flange portion 22 is d 1 mm, the dimension of the flange portion 22 in the thickness direction of the cover plate 1 is t 1 mm, that is, the thickness of the flange portion 22 is t 1 mm, the distance between the outer circumference and the inner circumference of the seal 4 in the direction perpendicular to the thickness of the cover plate 1 is d 2 mm, that is, the width of the seal 4 is d 2 mm, the compression amount of the seal 4 is C mm, satisfying: 0.5≤(d 1 *t 1 ) / (d 2 *C)≤15. Preferably, (d 1 *t 1 ) / (d 2 *C) can take values ​​such as 1, 1.5, 2, 2.5, 4, 5.5, 7, 8, 10, 11.5, 13, 13.5, 14, etc.

[0030] Under the premise that the seal 4 plays a sealing role, if the seal 4 is too large or the compression of the seal 4 is too large, there will be a large pressure on the flange 22, and the flange 22 is easy to deform. Since the pole 2 needs to be installed on the cover 1 by the welding part, the deformation of the flange 22 will cause the seal to fail and deform, and at the same time cause the welding part to tear and deform. If the seal 4 is too small, the compression is also small, the sealing effect is poor, and the electrolyte inside the battery will penetrate into the gap of the cover 1.

[0031] When the above range is met, by limiting the dimensional relationship between the flange portion 22 and the seal 4, the anti-extrusion performance of the flange portion 22 can be ensured, and the flange portion 22 can be prevented from being deformed due to the pressure applied by the seal 4, thereby reducing the risk of sealing failure of the pole 2 and tearing deformation of the welding portion, thereby improving the safety of the overall structure of the battery.

[0032] In measuring d 1 ,t 1 and 2 When measuring, you can use a general length measuring tool, such as a vernier caliper.

[0033] Specifically, for d 1 , measure the distance between the outer circumference and the inner circumference of the flange portion 22 in the radial direction of the pole body 21, measure multiple times and take the average value to obtain the distance d between the outer circumference and the inner circumference of the flange portion 22 in the radial direction of the pole body 21 1 In this embodiment, the flange portion 22 is annular, d 1 It is also the width of the flange portion 22 .

[0034] For d 2 , measure the distance between the two surfaces of the seal 4 in the axial direction of the pole body 21, measure multiple times and take the average value to obtain the radial distance d between the outer circumference and the inner circumference of the seal 4 in the pole body 21 2 In this embodiment, the seal 4 is also annular, d 2 It is also the width of the flange portion 22 .

[0035] For t 1 , measure the distance between the two surfaces of the flange portion 22 in the axial direction of the pole body 21, measure multiple times and take the average value to obtain the thickness t of the flange portion 22 1 mm.

[0036] For C, take a separate seal 4, measure the thickness of the seal 4 and record it as the first thickness, take the assembled cover plate assembly and cut it open, measure the thickness of the seal 4 after compression on the cross section and record it as the second thickness, measure multiple times and take the average value, calculate the difference between the first thickness and the second thickness, and obtain the compression amount C mm of the seal 4.

[0037] To support the rationality of the above numerical range, this embodiment also conducts strength tests and leak rate tests on the cover plate assemblies that meet the above numerical range, and uses the tensile force value and leak rate as indicator data, and 8 groups are set in this embodiment. At the same time, test data of the cover plate assemblies that do not meet the above numerical range are provided for comparison, and 2 groups are set in this embodiment.

[0038] The anti-extrusion performance of the flange 22 is reflected by the tensile test to detect the tensile value. Specifically, 20 batteries are taken for each test, and a tensile block is installed on the surface of the pole 2. The clamp 3 is fixed at one end of the tensile machine, and the pole 2 is pulled through the tensile block at the other end. The tensile machine sensor is turned on until the pole 2 falls off. The maximum value in the tensile value curve is the tensile value. The average tensile value is greater than 1200N for passing.

[0039] The sealing performance is reflected by the leakage rate. Specifically, 20 batteries are taken for each test. The pole 2 is placed in a special airtightness test tool. The airtightness test tool is then connected to a helium detector. Helium is passed into the helium detector to observe whether the leakage rate value of the helium detector exceeds the standard. If there is leakage, it is considered unqualified.

[0040] Please refer to Table 1 for the test parameters and index data of each group.

[0041] Table 1 It can be seen from the data in Table 1 that the flange portion 22 that meets the above numerical range has better anti-extrusion performance and sealing effect.

[0042] In some embodiments, the projection of the sealing member 4 on the cover plate 1 at least partially overlaps with the projection of the welding portion on the cover plate 1 .

[0043] The width d of the flange portion 22 1 mm, thickness t of flange portion 22 1 mm, width d of seal 4 2 mm and the compression amount of the seal 4 is C mm and also satisfies: 0.8≤(d 1 *t 1 ) / (d 2 *C)≤14. Preferably, (d 1 *t 1 ) / (d 2*C) can take values ​​such as 1, 2, 4.5, 5.5, 7, 9, 11, 12.5, 13, etc.

[0044] Since the projection of the seal 4 and the projection of the weld part at least partially overlap, the weld part has a high risk of pulling, so the limit is 0.8≤(d 1 *t 1 ) / (d 2 *C)≤14, which can further reduce the risk of sealing failure of the pole 2 and tearing deformation of the welding part, thereby improving the safety of the overall structure of the battery.

[0045] In some embodiments, the width d of the seal 4 is 2 mm also satisfies: 2≤d 2 ≤6. Preferably, d 2 The possible values ​​are 2.5, 3, 3.4, 4, 4.2, 4.8, 5, 5.5, etc.

[0046] By limiting 2 , which can prevent the seal 4 from being too large, reduce the pressure on the flange portion 22, and reduce the risk of flange deformation.

[0047] In some embodiments, the compression amount C mm of the seal 4 also satisfies: 0.3≤C≤0.7. Preferably, C can take values ​​such as 0.4, 0.5, and 0.6.

[0048] By limiting C, it is possible to prevent the seal 4 from having an excessive amount of compression, reduce the pressure on the flange portion 22, and reduce the risk of flange deformation.

[0049] In some embodiments, the thickness t of the flange portion 22 is 1 mm also satisfies: 0.5≤t 1 ≤1.5. Preferably, t 1 The possible values ​​are 0.7, 0.85, 1, 1.2, 1.35, 1.4, etc.

[0050] If the thickness of the flange portion 22 is too small, the rebound force applied by the seal 4 to the flange portion 22 may easily cause the flange portion 22 to deform. If the thickness of the flange portion 22 is too large, it will occupy too much space, affecting the space utilization of the battery.

[0051] In some embodiments, the seal 4 includes a flat portion 41 and a vertical portion 42, and the flat portion 41 and the vertical portion 42 are both arranged on the outer peripheral side of the pole body 21, and the vertical portion 42 is arranged on the edge of the flat portion 41 close to the pole body 21. A portion of the flat portion 41 is located between the flange portion 22 and the cover plate 1, and at least a portion of the vertical portion 42 is located between the hole wall of the mounting hole and the pole body 21.

[0052] With such a structure, the vertical portion 42 can seal the gap between the hole wall of the mounting hole and the surface of the pole body 21 .

[0053] The maximum dimension of the seal 4 in the thickness direction of the cover plate 1 is t 2 mm, satisfying: 2≤t 2 / C≤6. Preferably, t 2 / C can take values ​​such as 2.6, 3, 3.4, 4, 4.5, 5, 5.8, etc.

[0054] The vertical portion 42 of the seal 4 receives less pressure from the cover plate 1 than the flat portion 41, but the vertical portion 42 also provides a certain amount of compression. When this range is met, the pressure can be balanced. 2 and C to prevent the two from being unbalanced and to prevent the seal 4 from exerting excessive pressure on the flange portion 22.

[0055] In addition, t 2 Also satisfies 1.2≤t 2 ≤1.8. Preferably, t 2 The possible values ​​are 1.3, 1.45, 1.52, 1.64, 1.72, etc.

[0056] The projection of the vertical portion 42 on the cover plate 1 coincides with the projection of the welding portion on the cover plate 1 .

[0057] The width d of the flange portion 22 1 mm, thickness t of flange portion 22 1 mm, width d of seal 4 2 mm and the compression amount of the seal 4 is C mm and also satisfies: 2.2≤(d 1 *t 1 ) / (d 2 *C)≤15. Preferably, (d 1 *t 1 ) / (d 2 *C) can take values ​​such as 3, 3.7, 4, 4.6, 5, 7.5, 9, 10.9, 12.4, 13, 14.7, etc.

[0058] The vertical portion 42 can release a certain amount of stress, thereby reducing the compression amount C of the seal 4. Therefore, for this shape of the seal 4, it is necessary to adjust (d 1 *t 1 ) / (d 2 *C) to better adapt to the seal 4 of this shape, reduce the risk of failure of the pole 2 seal and tearing deformation of the weld, thereby improving the safety of the overall structure of the battery.

[0059] In some embodiments, the pole body 21 includes a pole portion 23 and a transition portion 24, one end of the pole portion 23 is connected to one end of the transition portion 24, and the other end of the transition portion 24 is provided with a groove 311, the flange portion 22 is provided at the opening of the groove 311, and the clamping plate 3 is welded to the outer peripheral side of the pole portion 23 to form a welding portion; the material making the pole portion 23 includes aluminum, and the material making the transition portion 24 and the flange portion 22 includes copper.

[0060] In other words, the material of the flange portion 22 includes copper, and the material of the portion where the clamping plate 3 is welded to the pole body 21 includes aluminum. In this embodiment, the pole portion 23 is an aluminum pole, and the transition portion 24 is a copper pole with a flange shape.

[0061] The flange portion 22 is not only indirectly connected to the cover plate 1, but also electrically connected to the tab of the battery cell. With such a structure, the weight of the pole 2 itself can be reduced. With such a structure, the weight of the pole 2 itself can be reduced to ensure the connection strength between the clamping plate 3 and the pole body 21, and avoid the problem that the connection strength between the flange portion 22 and the battery cell tab is too high, resulting in the connection failure between the clamping plate 3 and the pole body 21.

[0062] The width d of the flange portion 22 1 mm, thickness t of flange portion 22 1 mm, width d of seal 4 2 mm and the compression amount of the seal 4 is C mm and also satisfies: 2.8≤(d 1 *t 1 ) / (d 2 *C)≤14. Preferably, (d 1 *t 1 ) / (d 2 *C) can take values ​​such as 3.5, 4, 5.8, 7, 8.4, 10, 11.5, 12.1, 13.8, etc.

[0063] Since the pole 2 in this embodiment is a copper-aluminum composite pole 2, there is a joint surface between the pole portion 23 and the transition portion 24, which results in the copper-aluminum composite pole 2 not being as strong as the integrated pole 2. Therefore, the rebound force of the seal 4 should be limited, and the adjustment (d 1 *t 1 ) / (d 2 *C) to better adapt to the copper-aluminum composite pole 2, reduce the risk of pole 2 sealing failure and welding part tearing and deformation, thereby improving the safety of the overall battery structure.

[0064] The area of ​​the connection surface between the pole part 23 and the transition part 24 is denoted as S mm 2 , satisfying: 78≤S≤1256.

[0065] The width d of the flange portion 221 mm, thickness t of flange portion 22 1 mm, width d of seal 4 2 mm and the compression amount of the seal 4 is C mm and also satisfies: 0.8≤(d 1 *t 1 ) / (d 2 *C)≤6.6. Preferably, (d 1 *t 1 ) / (d 2 *C) can take values ​​such as 1, 2, 3.4, 4.5, 5.1, 6.2, etc.

[0066] The larger the bonding surface between the pole part 23 and the transition part 24, the stronger the bonding strength of the copper-aluminum pole 2. This can appropriately reduce the strength of the flange part 22, thereby adjusting (d 1 *t 1 ) / (d 2 *C) to better adapt to the copper-aluminum composite pole 2 with different bonding surface sizes, reduce the risk of pole 2 sealing failure and welding part tearing and deformation, thereby improving the safety of the overall battery structure.

[0067] In some embodiments, the projection profile of the pole body 21 on the cover plate 1 is in the shape of a racetrack.

[0068] The width d of the flange portion 22 1 mm, thickness t of flange portion 22 1 mm, width d of seal 4 2 mm and the compression amount of the seal 4 is C mm and also satisfies: 0.8≤(d 1 *t 1 ) / (d 2 *C)≤14. Preferably, (d 1 *t 1 ) / (d 2 *C) can take values ​​such as 1, 2.6, 4.9, 5.1, 6.8, 8.6, 10, 11.2, 12.8, 13.5, etc.

[0069] For this type of pole body 21, the pole body 21 is relatively long in the axial direction. If the compression amount of the seal 4 is large, the pole body 21 is likely to bend toward the outside of the battery. Therefore, it is necessary to adjust (d 1 *t 1 ) / (d 2 *C) range, strengthen the sealing member 4's ability to withstand compression force, so as to adapt to the pole body 21 of this shape.

[0070] In some embodiments, the width d of the flange portion 22 is 1 mm also satisfies: 2≤d 1≤7. Preferably, d 1 It can take values ​​such as 3, 4, 5, 6, etc.

[0071] By limiting 1 , the size of the flange portion 22 can be controlled, and the resistance pressure on the flange portion 22 can be reduced while ensuring the strength, thereby reducing the risk of flange deformation.

[0072] In some embodiments, the flange portion 22 is also used to support the battery cell, and the width d of the flange portion 22 is 1 mm also satisfies: 2≤d 1 ≤7. Preferably, d 1 The possible values ​​are 2.5, 3.5, 4.5, 5.5, 6.5, etc.

[0073] When the battery is inverted, the flange portion 22 needs to bear the weight of the battery cell. In order to prevent the flange portion 22 from deforming, it is necessary to adjust the d 1 range.

[0074] This embodiment also provides a battery, including the above-mentioned cover plate assembly, which can ensure the anti-extrusion performance of the flange and prevent the flange portion 22 from being deformed due to the pressure applied by the seal 4, thereby reducing the risk of sealing failure of the pole 2 and tearing deformation of the welding portion, thereby improving the overall structural safety of the battery.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate, which is provided with a mounting hole, wherein the mounting hole penetrates the cover plate along the thickness direction of the cover plate; A pole, comprising a pole body and a flange portion, wherein the pole body is inserted into the mounting hole, and the flange portion is disposed around the outer circumference of the pole body; A clamping plate, which surrounds the outer circumference of the pole body, and the clamping plate is welded to the outer circumference of the pole body to form a welding portion, the projection of the clamping plate on the cover plate at least partially overlaps with the projection of the flange portion on the cover plate, and the clamping plate and the flange portion can clamp the cover plate to limit the cover plate clamping plate; A clamping plate seal, which is disposed around the outer circumference of the pole body, and at least a portion of the seal is disposed between the flange portion and the cover plate, the flange portion and the cover plate clamp the seal, and the projection of the seal on the cover plate partially overlaps with the projection of the flange portion on the cover plate; Among them, the width of the flange part is d1mm, the thickness of the flange part is t1mm, the width of the seal is d2mm, the compression amount of the seal is C mm, and it satisfies: 0.5≤(d1*t1) / (d2*C)≤15, wherein the width of the flange part is the distance between the outer circumference and the inner circumference of the flange part in the direction perpendicular to the thickness of the cover plate, the thickness of the flange part is the size of the flange part in the direction of the thickness of the cover plate, and the width of the seal is the distance between the outer circumference and the inner circumference of the seal in the direction perpendicular to the thickness of the cover plate.

2. The battery cover assembly according to claim 1, characterized in that: The projection of the sealing member on the cover plate at least partially overlaps with the projection of the welding portion on the cover plate; The width d1mm of the flanged portion, the thickness t1mm of the flanged portion, the width d2mm of the seal and the compression amount C mm of the seal also satisfy: 0.8≤(d1*t1) / (d2*C)≤14.

3. The battery cover assembly according to claim 1, characterized in that: The width d2mm of the seal also satisfies: 2≤d2≤6.

4. The battery cover assembly according to claim 1, characterized in that: The compression amount C mm of the seal also satisfies: 0.3≤C≤0.

7.

5. The battery cover assembly according to claim 1, characterized in that: The thickness t1mm of the flanged portion also satisfies: 0.5≤t1≤1.

5.

6. The battery cover assembly according to claim 1, characterized in that: The sealing member comprises a flat plate portion and a vertical portion, wherein the flat plate portion and the vertical portion are both arranged around the outer circumference of the pole body, the vertical portion is arranged on the edge of the flat plate portion close to the pole body, a portion of the flat plate portion is located between the flange portion and the cover plate, and at least a portion of the vertical portion is located between the hole wall of the mounting hole and the pole body; The maximum dimension of the sealing member in the thickness direction of the cover plate is t2 mm, satisfying: 2≤t2 / C≤6.

7. The battery cover assembly according to claim 6, characterized in that: The projection of the vertical portion on the cover plate coincides with the projection of the welding portion on the cover plate; The width d1mm of the flanged portion, the thickness t1mm of the flanged portion, the width d2mm of the seal and the compression amount C mm of the seal also satisfy: 2.2≤(d1*t1) / (d2*C)≤15.

8. The battery cover assembly according to claim 1, characterized in that: The pole body comprises a pole part and a transition part, one end of the pole part is connected to one end of the transition part, and the other end of the transition part is provided with a groove, the flange part is provided at the opening of the groove, and the clamping plate is welded to the outer peripheral side of the pole part to form a welding part; The material of the pole portion includes aluminum, and the material of the transition portion and the flange portion includes copper.

9. The battery cover assembly according to claim 8, characterized in that: The width d1mm of the flanged portion, the thickness t1mm of the flanged portion, the width d2mm of the seal and the compression amount C mm of the seal also satisfy: 2.8≤(d1*t1) / (d2*C)≤14.

10. The battery cover assembly according to claim 8, characterized in that: The area of ​​the connection surface between the pole part and the transition part is denoted as S mm 2 , satisfying: 78≤S≤1256; The width d1mm of the flanged portion, the thickness t1mm of the flanged portion, the width d2mm of the seal and the compression amount C mm of the seal also satisfy: 0.8≤(d1*t1) / (d2*C)≤6.

6.

11. The battery cover assembly according to claim 1, characterized in that: The projection profile of the pole body on the cover plate is in the shape of a racetrack; The width d1mm of the flanged portion, the thickness t1mm of the flanged portion, the width d2mm of the seal and the compression amount C mm of the seal also satisfy: 0.8≤(d1*t1) / (d2*C)≤14.

12. The battery cover assembly according to claim 1, characterized in that: The width d1mm of the flange portion also satisfies: 2≤d1≤7.

13. The battery cover assembly according to claim 1, characterized in that: The flange portion is also used to support the battery cell, and the width d1mm of the flange portion also satisfies: 2≤d1≤7.

14. A battery, characterized in that: Comprising the cover plate assembly as described in any one of claims 1-13.

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