Battery cover plate production method, battery cover plate and battery monomer

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate production method, a battery cover plate and a battery single.The battery cover plate production method comprises the steps that S1, a pressing block assembly, a pole and a cover plate body are provided, the pressing block assembly comprises an insulating part and a pressing block embedded in a containing groove of the insulating part, and a gap is reserved between the groove bottom of the containing groove and the pressing block; the gap is close to the edge of the pressing block, a first extrusion area is arranged on the side, away from the cover plate body, of the pressing block, and the first extrusion area is right opposite to the gap. S2, arranging an insulating part on the cover plate body, enabling a notch of the accommodating groove to deviate from the cover plate body, enabling the pole to penetrate through the cover plate body, the insulating part and the pressing block, and enabling the axis of the pole to be overlapped with the center of the pressing block; s3, the first extrusion area is extruded in the direction facing the cover plate body, so that the side, facing the gap, of the pressing block is tightly attached to the groove bottom of the containing groove; s4, the edge of the pole and the side, away from the cover plate body, of the pressing block are welded. According to the battery cover plate production method, the flatness of the side, away from the cover plate body, of the pressing block can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cover production method, a battery cover and a battery cell. Background Art

[0002] The battery cover generally includes a cover body, a pressing block and a pole, wherein the pressing block is insulated and connected to the cover body, and the pole is passed through the cover body, the upper plastic and the pressing block and is welded to the pressing block.

[0003] At present, the connection method between the pole and the pressing block is: a through hole is provided at the center of the pressing block, the pole is passed through the through hole, and the edge of the pole is fixed to the edge of the through hole by welding.

[0004] The above connection method causes the edge of the press block to warp away from the battery cover under the action of welding stress after the press block and the pole are welded, thereby reducing the flatness of the side of the press block away from the cover body, thereby reducing the yield rate of the battery cover.

[0005] Therefore, it is urgent to propose a battery cover production method, a battery cover and a battery cell to solve the above technical problems. Summary of the invention

[0006] A first object of the present invention is to provide a method for producing a battery cover plate, which can improve the flatness of a side of a pressing block away from a cover plate body.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A battery cover production method, comprising:

[0009] S1. Provide a pressing block assembly, a pole and a cover body. The pressing block assembly includes an insulating member and a pressing block. The insulating member is provided with a receiving groove. The pressing block is embedded in the receiving groove. A gap is left between the bottom of the receiving groove and the pressing block. The gap is close to the edge of the pressing block. A first pressing area is provided on the side of the pressing block away from the cover body. The first pressing area is arranged opposite to the gap.

[0010] S2, placing the insulating member on the cover body, and making the notch of the receiving groove face away from the cover body, so that the pole passes through the cover body, the insulating member and the pressing block in sequence, and the axis of the pole overlaps with the center of the pressing block;

[0011] S3, squeezing the first squeezing area in a direction toward the cover plate body, so that one side of the pressing block facing the gap is in close contact with the bottom of the accommodating groove;

[0012] S4. Weld the edge of the pole and the side of the pressing block away from the cover body.

[0013] Optionally, a second extrusion area is provided on a side of the cover plate body facing away from the pressing block and / or a side of the pole facing away from the pressing block;

[0014] S3 includes: when squeezing the first squeezing area, squeezing the second squeezing area in a direction toward the cover plate body.

[0015] Optionally, the pole includes a base, a first column and a second column, one end of the first column is connected to the base, and the other end is connected to the second column, the diameter of the second column is smaller than the diameter of the first column, the pressing block is provided with a first mounting hole, the hole wall of the first mounting hole is provided with a convex ring, and the convex ring is coaxial with the first mounting hole;

[0016] S2 includes: positioning the base on a side of the cover body away from the pressing block, and using the side of the base away from the cover body as a second extrusion area, allowing the second column to sequentially penetrate the cover body, the insulating member, and the pressing block, and allowing the first column to sequentially penetrate the cover body and the insulating member;

[0017] S3 includes: simultaneously squeezing the first squeezing area and the second squeezing area in a direction toward the cover body, so that the convex ring is pressed tightly against a side of the first column away from the base.

[0018] Optionally, S4 includes: continuously extruding the first extrusion zone in a direction toward the cover plate body until welding is completed, and then stopping extruding the first extrusion zone.

[0019] Optionally, S4 includes:

[0020] S41, riveting the pole and the pressing block;

[0021] S42. Weld the edge of the pole to the side of the pressing block away from the cover plate body.

[0022] Optionally, in S1, a dimension of the gap in a direction perpendicular to the cover plate body is 0.05 mm-0.25 mm.

[0023] Optionally, the number of the first extrusion areas and the number of the gaps are at least two and they correspond one to one, and the at least two first extrusion areas are evenly distributed along the circumference of the pressing block;

[0024] Alternatively, the number of the first extrusion zone and the number of the gap are both one, and the first extrusion zone extends along the circumference of the pressing block and is connected end to end.

[0025] Optionally, a thinning area is provided at the bottom of the accommodating groove, and a gap is formed between the thinning area and a side of the pressing block facing the cover plate body.

[0026] A second object of the present invention is to provide a battery cover plate, wherein the pressing block on the battery cover plate has a higher flatness on the side away from the cover plate body, thereby making the battery cover plate have a higher yield rate.

[0027] To achieve this object, the present invention adopts the following technical solutions:

[0028] A battery cover plate, the battery cover plate is manufactured by the above-mentioned battery cover plate production method.

[0029] A third object of the present invention is to provide a battery cell having a higher yield rate.

[0030] To achieve this object, the present invention adopts the following technical solutions:

[0031] The battery cell comprises a battery shell, a battery core and the above-mentioned battery cover plate, wherein the battery core is arranged in the battery shell, and the battery cover plate is arranged at the opening of the battery shell.

[0032] Beneficial effects of the present invention:

[0033] The battery cover production method provided by the present invention provides a pressing block assembly, a pole and a cover body in S1, wherein the pressing block is embedded in the receiving groove of the insulating member, and a gap is left between the bottom of the receiving groove and the pressing block, the gap is close to the edge of the pressing block, and the area of ​​the pressing block facing away from the side of the cover body and facing the gap is the first extrusion area; in S2, the pole is sequentially passed through the cover body, the insulating member and the pressing block, and the axis of the pole overlaps with the center of the pressing block; in S3, the first extrusion area of ​​the pressing block is extruded in the direction toward the cover body, so that the side of the pressing block facing the gap is in close contact with the bottom of the receiving groove, that is, in S3, the pressing block is pressed. The first extrusion zone is bent toward the direction of the cover body to form a pre-deformation; in S4, the edge of the pole and the side of the pressure block away from the cover body are welded to achieve the fixation of the pole and the pressure block. After the pole and the pressure block are welded, under the action of welding stress, the edge of the pressure block will warp in the direction away from the cover body. Since the pre-deformation of the first extrusion zone in S3 compensates for the warping of the edge of the pressure block in S4, the battery cover production method can make the side of the pressure block away from the cover body have a higher flatness after the edge of the pressure block is warped in the direction away from the cover body, thereby having the effect of improving the yield rate of the battery cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the process of producing a battery cover provided by the present invention;

[0035] Figure 2 It is a schematic diagram of the cross-sectional structure of the battery cover provided by the present invention;

[0036] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0037] Figure 4 It is a structural schematic diagram of the insulating member provided by the present invention;

[0038] Figure 5It is a schematic diagram of the structure of the pressing block provided by the present invention;

[0039] Figure 6 It is a schematic diagram of the structure of the pole provided by the present invention.

[0040] In the figure:

[0041] 110, insulating member; 111, receiving groove; 112, thinning area; 113, second mounting hole; 120, pressing block; 121, first mounting hole; 122, convex ring; 130, gap; 200, pole; 210, base; 220, first column; 230, second column; 231, protrusion; 300, cover body; 410, first extrusion area; 420, second extrusion area; 500, sealing ring. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] This embodiment provides a battery cover production method, which can improve the flatness of the side of the pressing block away from the cover body.

[0047] Specifically, Figures 1 to 4 As shown, the battery cover production method includes:

[0048] S1. Provide a pressing block assembly, a pole 200 and a cover body 300. The pressing block assembly includes an insulating member 110 and a pressing block 120. The insulating member 110 is provided with a receiving groove 111. The pressing block 120 is embedded in the receiving groove 111. A gap 130 is left between the bottom of the receiving groove 111 and the pressing block 120. The gap 130 is close to the edge of the pressing block 120. A first extrusion area 410 is provided on a side of the pressing block 120 away from the cover body 300. The first extrusion area 410 is arranged opposite to the gap 130.

[0049] S2, the insulating member 110 is arranged on the cover body 300, and the notch of the receiving groove 111 is oriented away from the cover body 300, so that the pole 200 passes through the cover body 300, the insulating member 110 and the pressing block 120 in sequence, and the axis of the pole 200 overlaps with the center of the pressing block 120;

[0050] S3, squeezing the first squeezing area 410 in a direction toward the cover plate body 300, so that the side of the pressing block 120 facing the gap 130 is in close contact with the bottom of the receiving groove 111;

[0051] S4, welding the edge of the pole 200 and the side of the pressing block 120 away from the cover plate body 300;

[0052] S5. Allow the welding area between the pole 200 and the pressing block 120 to cool naturally.

[0053] Based on the above design, a pressing block assembly, a pole 200 and a cover plate body 300 are provided in S1, wherein the pressing block 120 is embedded in the receiving groove 111 of the insulating member 110, and a gap 130 is left between the bottom of the receiving groove 111 and the pressing block 120, and the gap 130 is close to the edge of the pressing block 120, and the area of ​​the pressing block 120 facing away from the side of the cover plate body 300 and facing the gap 130 is the first extrusion area 410; in S2, the pole 200 is sequentially passed through the cover plate body 300, the insulating member 110 and the pressing block 120, and the axis of the pole 200 overlaps with the center of the pressing block 120; in S3, the first extrusion area 410 of the pressing block 120 is extruded in the direction toward the cover plate body 300, so that the side of the pressing block 120 facing the gap 130 is in close contact with the bottom of the receiving groove 111, that is, in S3, the first extrusion area 410 of the pressing block 120 is 410 is bent toward the direction of the cover body 300 to form a pre-deformation; in S4, the edge of the pole 200 and the side of the pressing block 120 away from the cover body 300 are welded to achieve the fixation of the pole 200 and the pressing block 120. After the welding of the pole 200 and the pressing block 120 is completed, the welding area between the pole 200 and the pressing block 120 is naturally cooled (i.e. S5). Under the action of welding stress, in S5, the edge of the pressing block 120 will warp in the direction away from the cover body 300. Since the pre-deformation of the first extrusion zone 410 in S3 compensates for the warping of the edge of the pressing block 120 in S4, the battery cover production method can make the side of the pressing block 120 away from the cover body 300 have a higher flatness after the edge of the pressing block 120 warps in the direction away from the cover body 300, thereby having the effect of improving the yield rate of the battery cover.

[0054] Optionally, S3 includes: gradually increasing the extrusion force applied to the first extrusion zone 410 along the center direction of the pressing block 120 toward the edge direction of the pressing block 120 to ensure that sufficient pre-deformation is formed at a position close to the edge of the pressing block 120 .

[0055] Alternatively, if Figures 1 to 4 As shown, a second extrusion zone 420 is provided on the side of the pole 200 away from the pressing block 120; S3 includes: when the first extrusion zone 410 is extruded, the second extrusion zone 420 is extruded in the direction toward the cover plate body 300. This method is designed to improve the close contact between the side of the pressing block 120 facing the gap 130 and the bottom of the accommodating groove 111, so that the edge of the pressing block 120 (i.e., the first extrusion zone 410) forms sufficient pre-deformation in S3, and then in S5, after the edge of the pressing block 120 (i.e., the first extrusion zone 410) is lifted, the flatness of the side of the pressing block 120 away from the cover plate body 300 is guaranteed.

[0056] In another embodiment, the second extrusion zone 420 may also be the side of the cover body 300 away from the pressing block 120. In yet another embodiment, the side of the cover body 300 away from the pressing block 120 and the side of the pole 200 away from the pressing block 120 are both the second extrusion zone 420. In yet another embodiment, in step S3, the side of the cover away from the pressing block 120 is placed on a support table, and then the first extrusion zone 410 is extruded, at which time the support table only applies a reaction force to the extrusion force of the first extrusion zone 410 on the cover body 300, and does not apply an extrusion force to the cover body 300 and / or the pole 200.

[0057] Furthermore, if Figures 1 to 6 As shown, the pole 200 includes a base 210, a first column 220 and a second column 230, one end of the first column 220 is connected to the base 210, and the other end is connected to the second column 230, the first column 220 and the second column 230 are coaxial, the diameter of the second column 230 is smaller than the diameter of the first column 220, the pressing block 120 is provided with a first mounting hole 121, the hole wall of the first mounting hole 121 is provided with a convex ring 122, and the convex ring 122 is coaxial with the first mounting hole 121;

[0058] S2 includes: positioning the base 210 on a side of the cover body 300 away from the pressing block 120, and using the side of the base 210 away from the cover body 300 as a second pressing area 420, allowing the second column 230 to sequentially penetrate the cover body 300, the insulating member 110 and the pressing block 120, and allowing the first column 220 to sequentially penetrate the cover body 300 and the insulating member 110;

[0059] S3 includes: simultaneously squeezing the first squeezing area 410 and the second squeezing area 420 in a direction toward the cover body 300, so that the convex ring 122 is pressed tightly against the side of the first column 220 away from the base 210. This process design can improve the tightness of the connection between the pressing block 120 and the pole 200, thereby improving the conductivity between the pole 200 and the pressing block 120.

[0060] Furthermore, if Figures 1 to 6As shown, S2 includes: firstly, the sealing ring 500 is sleeved on the first column 220, and the sealing ring 500 is located on the base 210, then the base 210 is located on the side of the cover body 300 away from the pressing block 120, and the side of the base 210 away from the cover body 300 is used as the second extrusion area 420, the second column 230 is sequentially passed through the cover body 300, the insulating member 110 and the pressing block 120, and the first column 220 is sequentially passed through the cover body 300 and the insulating member 110, at which time the sealing ring 500 is located between the base 210 and the cover body 300. In S3, the first extrusion area 410 and the second extrusion area 420 are simultaneously extruded in the direction toward the cover body 300, so that the base 210 and the cover body 300 cooperate to press the sealing ring 500, so that the sealing ring 500 is compressed into place, and the sealing between the pole 200 and the cover body 300 is achieved.

[0061] Furthermore, if Figures 1 to 6 As shown, the bottom of the accommodating groove 111 is provided with a second mounting hole 113, and the second column 230 and the first column 220 are both penetrated by the second mounting hole 113, the aperture of the second mounting hole 113 is larger than the aperture of the first mounting hole 121, and the aperture of the first mounting hole 121 is smaller than the diameter of the first column 220, and then after the first extrusion area 410 and the second extrusion area 420 are extruded at the same time, the edges of the convex ring 122 and the first mounting hole 121 can be pressed against the side of the first column 220 away from the base 210. It can be seen that this design expands the pressing area between the pressing block 120 and the pole 200, and has the effect of further improving the conductive performance between the pole 200 and the pressing block 120.

[0062] Alternatively, if Figures 1 to 6 As shown, S4 includes:

[0063] S41, riveting the pole 200 and the pressing block 120, specifically, riveting one end of the second column 230 away from the first column 220 and the side of the pressing block 120 away from the cover plate body 300, so as to form a protrusion 231 on the side wall of the second column 230, the protrusion 231 extends along the circumference of the second column 230 and is connected end to end, and the protrusion 231 is located at the end of the second column 230 away from the first column 220. After riveting, the protrusion 231 is pressed against the side of the convex ring 122 away from the first column 220, so as to realize the connection between the pole 200 and the pressing block 120;

[0064] S42, weld the edge of the pole 200 to the side of the pressing block 120 away from the cover plate body 300. Specifically, weld the edge of the protrusion 231 away from the end of the first column 220 to the edge of the first mounting hole 121 to achieve a fixed connection between the pole 200 and the pressing block 120. It can be understood that the weld between the edge of the protrusion 231 and the edge of the first mounting hole 121 is the welding area of ​​the pole 200 and the pressing block 120 in the above S5.

[0065] Optionally, S4 includes: continuously extruding the first extrusion area 410 in the direction toward the cover body 300 until welding is completed, and stopping extruding the first extrusion area 410 to ensure that before welding is completed (i.e., before S5), the side of the pressing block 120 facing the gap 130 remains in close contact with the bottom of the accommodating groove 111, thereby avoiding the problem of low flatness of the side of the pressing block 120 away from the cover body 300 after S5 due to the warping of the edge of the pressing block 120 before S5.

[0066] Alternatively, if Figures 1 to 6 As shown, a thinning area 112 is provided at the bottom of the accommodating groove 111, and the thinning area 112 is close to the inner wall of the accommodating groove 111. A gap 130 is formed between the thinning area 112 and the side of the pressing block 120 facing the cover body 300. This design can expand the volume of the pressing block 120, thereby improving the conductive performance of the pressing block 120.

[0067] In another embodiment, a slope is provided on the edge of the pressing block 120 and on the side facing the bottom of the receiving groove 111. The slope is inclined in the direction away from the bottom of the receiving groove 111 along the center of the pressing block 120 pointing to the edge of the pressing block 120, thereby forming a gap 130 between the slope and the bottom of the receiving groove 111.

[0068] In yet another embodiment, a slope is provided on the edge of the pressing block 120 and on one side facing the bottom of the receiving groove 111. The slope is inclined in a direction away from the bottom of the receiving groove 111 along the center of the pressing block 120 pointing to the edge of the pressing block 120. A thinning area 112 is provided at the bottom of the receiving groove 111. The thinning area 112 is close to the inner wall of the receiving groove 111, thereby forming a gap 130 between the slope and the thinning area 112.

[0069] Optionally, in S1, the size of the gap 130 in the direction perpendicular to the cover body 300 is 0.05mm-0.25mm. Exemplarily, the size of the gap 130 can be 0.05mm, 0.1mm, 0.2mm or 0.25mm, etc. On the one hand, the edge of the pressing block 120 is sufficiently pre-deformed in S3, thereby ensuring that in S5, after the edge of the pressing block 120 is lifted, the side of the pressing block 120 away from the cover body 300 has a higher flatness. On the other hand, it can avoid the problem of bending transition of the edge of the pressing block 120 (i.e., excessive pre-deformation) or even cracks when the first extrusion zone 410 is extruded in S3.

[0070] Alternatively, if Figures 1 to 6 As shown, the number of the first extrusion area 410 and the gap 130 are at least two and correspond one to one, and at least two first extrusion areas 410 are evenly distributed along the circumference of the pressing block 120. In this embodiment, the number of the first extrusion area 410 and the gap 130 are both two, and the two first extrusion areas 410 are symmetrically arranged about the center of the pressing block 120, and the two thinning areas 112 (i.e., the gap 130) are symmetrically arranged about the axis of the second mounting hole 113, and then the two first extrusion areas 410 can be extruded in S3, so that both sides of the pressing block 120 can form pre-deformation. After the welding of the pressing block 120 and the pole 200 is completed, the two pre-deformation positions are respectively warped in the direction away from the cover plate body 300, which provides a strong guarantee for improving the flatness of the side of the pressing block 120 away from the cover plate body 300. It can be understood that in other embodiments, the number of the first extrusion areas 410 can also be three or four.

[0071] In another embodiment, the number of the first extrusion zone 410 and the number of the gap 130 are both one, and the first extrusion zone 410 extends along the circumference of the pressing block 120 and is connected end to end.

[0072] In this embodiment, the insulating member 110 is a component with insulating properties such as a plastic member, and the pressing block 120 is a component with conductive properties such as an aluminum block.

[0073] This embodiment also provides a battery cover, which is manufactured by the above-mentioned battery cover production method. The pressing block 120 on the battery cover has a higher flatness on the side away from the cover body 300, thereby making the battery cover have a higher yield rate.

[0074] The present embodiment also provides a battery cell, which includes a battery shell, a battery cell and the above-mentioned battery cover, the battery cell is arranged in the battery shell, the battery cover is arranged at the opening of the battery shell, and the pressing block 120 is located on the side of the battery cover away from the battery shell. The battery cell adopts the above-mentioned battery cover, and the side of the pressing block 120 away from the battery cover has a higher flatness, thereby improving the yield rate of the battery cover and the battery cell adopting the battery cover.

[0075] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery cover production method, characterized in that: include: S1. A pressing block assembly, a pole (200) and a cover plate body (300) are provided, wherein the pressing block assembly comprises an insulating member (110) and a pressing block (120), wherein the insulating member (110) is provided with a receiving groove (111), wherein the pressing block (120) is embedded in the receiving groove (111), wherein a gap (130) is left between the bottom of the receiving groove (111) and the pressing block (120), wherein the gap (130) is close to an edge of the pressing block (120), and a first pressing area (410) is provided on a side of the pressing block (120) facing away from the cover plate body (300), wherein the first pressing area (410) is arranged opposite to the gap (130); S2, arranging the insulating member (110) on the cover body (300), and making the notch of the receiving groove (111) face away from the cover body (300), so that the pole (200) passes through the cover body (300), the insulating member (110) and the pressing block (120) in sequence, and making the axis of the pole (200) overlap with the center of the pressing block (120); S3, squeezing the first squeezing area (410) in a direction toward the cover plate body (300) so that the side of the pressing block (120) facing the gap (130) is in close contact with the bottom of the containing groove (111); S4. Welding the edge of the pole (200) and the side of the pressing block (120) facing away from the cover plate body (300).

2. The battery cover production method according to claim 1, characterized in that: A second pressing area (420) is provided on a side of the cover plate body (300) facing away from the pressing block (120) and / or a side of the pole (200) facing away from the pressing block (120); The step S3 comprises: when the first extrusion area (410) is extruded, the second extrusion area (420) is extruded in a direction toward the cover plate body (300).

3. The battery cover production method according to claim 2, characterized in that: The pole (200) comprises a base (210), a first column (220) and a second column (230); one end of the first column (220) is connected to the base (210), and the other end is connected to the second column (230); the diameter of the second column (230) is smaller than the diameter of the first column (220); the pressing block (120) is provided with a first mounting hole (121); a convex ring (122) is provided on the hole wall of the first mounting hole (121); the convex ring (122) is coaxial with the first mounting hole (121); The step S2 comprises: positioning the base (210) on a side of the cover body (300) away from the pressing block (120), and using the side of the base (210) away from the cover body (300) as the second extrusion area (420), allowing the second column (230) to sequentially penetrate the cover body (300), the insulating member (110) and the pressing block (120), and allowing the first column (220) to sequentially penetrate the cover body (300) and the insulating member (110); The S3 comprises: simultaneously squeezing the first squeezing area (410) and the second squeezing area (420) in a direction toward the cover plate body (300) so that the convex ring (122) is pressed tightly against a side of the first column (220) facing away from the base (210).

4. The method for producing a battery cover according to any one of claims 1 to 3, characterized in that: The step S4 comprises: continuously extruding the first extrusion area (410) in a direction toward the cover plate body (300) until welding is completed, and then stopping extruding the first extrusion area (410).

5. The battery cover production method according to any one of claims 1 to 3, characterized in that: The S4 includes: S41, riveting the pole (200) and the pressing block (120); S42, welding the edge of the pole (200) to the side of the pressing block (120) facing away from the cover plate body (300).

6. The method for producing a battery cover according to any one of claims 1 to 3, characterized in that: In S1, the dimension of the gap (130) in a direction perpendicular to the cover plate body (300) is 0.05 mm to 0.25 mm.

7. The method for producing a battery cover according to any one of claims 1 to 3, characterized in that: The number of the first extrusion areas (410) and the number of the gaps (130) are both at least two and correspond to each other one by one, and at least two of the first extrusion areas (410) are evenly distributed along the circumference of the pressing block (120); Alternatively, the number of the first extrusion zone (410) and the number of the gap (130) are both one, and the first extrusion zone (410) extends along the circumference of the pressing block (120) and is connected end to end.

8. The method for producing a battery cover according to any one of claims 1 to 3, characterized in that: A thinning area (112) is provided at the bottom of the accommodating groove (111), and the gap (130) is formed between the thinning area (112) and a side of the pressing block (120) facing the cover plate body (300).

9. A battery cover, characterized in that: The battery cover plate is manufactured by the battery cover plate production method according to any one of claims 1 to 8.

10. A battery cell, characterized in that: It comprises a battery shell, a battery cell and the battery cover plate as claimed in claim 9, wherein the battery cell is arranged in the battery shell, and the battery cover plate is arranged at the opening of the battery shell.

Images