Battery cover plate and power battery

Abstract

The utility model discloses a battery cover plate and a power battery. The battery cover plate comprises a top cover sheet, a positive pole, a negative pole, positive upper plastic and negative upper plastic, the top cover plate is characterized in that a welding fixing ring is fixed on the periphery of each pole mounting hole on the lower surface of the top cover plate through laser welding; the positive pole and the negative pole extend downwards to form a connecting convex part, and the lower end surface of the connecting convex part protrudes out of the pole mounting hole and also protrudes out of the lower surface of the welding fixing ring to serve as a connecting acting surface; an inverted U-shaped sealing ring is arranged between each welding fixing ring and the positive pole / negative pole; the cross section of each inverted U-shaped sealing ring is in an inverted U shape formed by two vertical sections extending downwards and a transverse section connected between the upper ends of the two vertical sections; the top surface of a transverse section of the inverted U-shaped sealing ring is propped against the positive pole / negative pole, the lower end surface of a vertical section of the inverted U-shaped sealing ring is propped against the upper surface of the welding fixing ring, and the lower end of the other vertical section of the inverted U-shaped sealing ring extends and is isolated between the inner circumferential surface of the welding fixing ring and the periphery of the connecting convex part.

Description

Technical Field

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

[0002] As representatives of new energy vehicles, hybrid vehicles and pure electric vehicles have gradually been recognized by manufacturers and consumers. As the main power source of new energy vehicles, power batteries have become one of the key components of electric vehicles.

[0003] In the prior art, the battery top cover usually includes a top cover sheet, a positive electrode column, a negative electrode column, a positive electrode upper plastic and a negative electrode upper plastic; two electrode column mounting holes are provided on the top cover sheet, the positive electrode column and the negative electrode column are respectively placed in the corresponding electrode column mounting holes, the positive electrode upper plastic surrounds the outer periphery of the electrode column mounting hole provided on the positive electrode column and is isolated and connected between the positive electrode column and the top cover sheet, and the negative electrode upper plastic surrounds the outer periphery of the electrode column mounting hole provided on the negative electrode column and is isolated and connected between the negative electrode column and the top cover sheet; since the bottom surfaces of the positive electrode column and the negative electrode column are flat and do not protrude from the electrode column mounting holes, when in use, they also need to be welded to the pole ears of the battery cell through a connecting sheet, and the upper end surface of the connecting sheet needs to have a protruding portion protruding upward, so that the protruding portion extends into the electrode column mounting hole and is welded to the positive electrode column / negative electrode column.

[0004] The above prior art has the following deficiencies:

[0005] 1. A raised structure is required on the connecting piece used during use, which makes the mold opening complicated, and the raised part is located in the pole mounting hole, which is not convenient for welding;

[0006] 2. The plastic on the positive electrode column and the plastic on the negative electrode column have micropores in their materials, which will leak and affect the airtightness inside the battery. Therefore, a sealing ring is required. In the prior art, a sealing ring with a square cross-section is generally used. The sealing ring needs to be pre-compressed during assembly, and the manufacturing and assembly process is complicated and the production cost is high. Summary of the invention

[0007] The utility model aims to provide a battery cover plate and a power battery, which are improved from the structural point of view to facilitate assembly and reduce production costs.

[0008] In order to achieve the above-mentioned purpose, the battery cover plate technical scheme adopted by the utility model is: a battery cover plate, including a top cover plate, a positive pole, a negative pole, a positive pole upper plastic and a negative pole upper plastic; the top cover plate is provided with two pole mounting holes, the positive pole and the negative pole are respectively arranged in the pole mounting holes, the positive pole upper plastic surrounds the outer periphery of the pole mounting hole arranged in the positive pole and is isolated and connected between the positive pole and the top cover plate, and the negative pole upper plastic surrounds the outer periphery of the pole mounting hole arranged in the negative pole and is isolated and connected between the negative pole and the top cover plate; a welding fixing ring is fixed by laser welding on the outer periphery of each pole mounting hole on the lower surface of the top cover plate; the positive pole and the negative pole are respectively arranged in the pole mounting holes ... A connecting protrusion extends downward, and the lower end surface of the connecting protrusion protrudes from the pole mounting hole and also protrudes from the lower surface of the welding fixing ring to serve as a connecting action surface; an inverted U-shaped sealing ring is arranged between each of the welding fixing rings and the positive pole / negative pole, and the cross-section of the inverted U-shaped sealing ring is an inverted U-shape consisting of two vertical sections extending downward and a horizontal section connected between the upper ends of the two vertical sections; the top surface of the horizontal section of the inverted U-shaped sealing ring abuts against the positive pole / negative pole, and the lower end surface of one vertical section abuts against the upper surface of the welding fixing ring, and the lower end of the other vertical section extends and is isolated between the inner peripheral surface of the welding fixing ring and the outer periphery of the connecting protrusion.

[0009] In the above scheme, the pole mounting hole edge of the top cover sheet is bent upward and extended into the hole to form a snap-in edge; the top cover sheet, the positive pole, the negative pole, the positive pole plastic and the negative pole plastic are integrally connected by the injection molding process, so that the positive pole plastic and the negative pole plastic fix and cover the corresponding snap-in edges.

[0010] The above scheme also includes a lower plastic insulating sheet, which is fixedly covered on the lower surface of the top cover sheet and covers the welding fixing ring and the inverted U-shaped sealing ring, and the lower end surfaces of the positive electrode column and the negative electrode column protrude from the lower surface of the lower plastic insulating sheet.

[0011] Furthermore, an annular reinforcement structure that is bent and arched upward is provided on the lower plastic insulating sheet at a position corresponding to the welding fixing ring.

[0012] In the above scheme, the cross section of the welding fixing ring is composed of a welding handle and a pressing portion extending inwardly and abutting against the sealing ring, and the thickness of the welding handle is greater than the thickness of the pressing portion.

[0013] Furthermore, a convex edge is protruding upwards on the inner edge of the pressing portion, and the convex edge is located between the two vertical sections of the inverted U-shaped sealing ring.

[0014] In the above scheme, a positioning groove corresponding to the top of the inverted U-shaped sealing ring is provided on the positive pole and the negative pole, so that the inverted U-shaped sealing ring is positioned in the positioning groove.

[0015] In the above solution, a mounting groove is provided on the lower surface of the top cover sheet around the outer circumference of the pole mounting hole, and the welding fixing ring is embedded in the mounting groove.

[0016] To achieve the above-mentioned purpose, the technical solution of the power battery adopted by the utility model is: a power battery, including a battery cover plate, the battery cover plate includes a top cover plate, a positive pole, a negative pole, a positive pole upper plastic and a negative pole upper plastic; two pole mounting holes are provided on the top cover plate, the positive pole and the negative pole are respectively arranged in the pole mounting holes, the positive pole upper plastic surrounds the outer periphery of the pole mounting hole arranged on the positive pole and is isolated and connected between the positive pole and the top cover plate, and the negative pole upper plastic surrounds the outer periphery of the pole mounting hole arranged on the negative pole and is isolated and connected between the negative pole and the top cover plate; a welding fixing ring is fixed by laser welding on the outer periphery of each pole mounting hole on the lower surface of the top cover plate; a connecting protrusion is extended downward from the positive pole and the negative pole, and the lower part of the connecting protrusion The end face protrudes from the pole mounting hole and also protrudes from the lower surface of the welding fixing ring to serve as a connecting action surface; an inverted U-shaped sealing ring is arranged between each of the welding fixing rings and the positive pole / negative pole, and the cross-section of the inverted U-shaped sealing ring is an inverted U-shape consisting of two vertical sections extending downward and a transverse section connected between the upper ends of the two vertical sections; the top surface of the transverse section of the inverted U-shaped sealing ring abuts against the positive pole / negative pole, and the lower end surface of one vertical section abuts against the upper surface of the welding fixing ring, and the lower end of the other vertical section extends and is isolated between the inner peripheral surface of the welding fixing ring and the outer periphery of the connecting protrusion; a connecting plate is arranged under the battery cover, and the connecting action surfaces of the connecting protrusions of the positive pole and the negative pole are welded and connected to the connecting plate.

[0017] In the above scheme, the pole mounting hole edge of the top cover sheet is bent upward and extended into the hole to form a snap-in edge; the top cover sheet, the positive pole, the negative pole, the positive pole plastic and the negative pole plastic are integrally connected by the injection molding process, so that the positive pole plastic and the negative pole plastic fix and cover the corresponding snap-in edges.

[0018] The above scheme also includes a lower plastic insulating sheet, which is fixedly covered on the lower surface of the top cover sheet and covers the welding fixing ring and the inverted U-shaped sealing ring, and the lower end surfaces of the positive electrode column and the negative electrode column protrude from the lower surface of the lower plastic insulating sheet.

[0019] Furthermore, an annular reinforcement structure that is bent and arched upward is provided on the lower plastic insulating sheet at a position corresponding to the welding fixing ring.

[0020] In the above scheme, the cross section of the welding fixing ring is composed of a welding handle and a pressing portion extending inwardly and abutting against the sealing ring, and the thickness of the welding handle is greater than the thickness of the pressing portion.

[0021] Furthermore, a convex edge is protruding upwards on the inner edge of the pressing portion, and the convex edge is located between the two vertical sections of the inverted U-shaped sealing ring.

[0022] In the above scheme, a positioning groove corresponding to the top of the inverted U-shaped sealing ring is provided on the positive pole and the negative pole, so that the inverted U-shaped sealing ring is positioned in the positioning groove.

[0023] In the above solution, a mounting groove is provided on the lower surface of the top cover sheet around the outer circumference of the pole mounting hole, and the welding fixing ring is embedded in the mounting groove.

[0024] Due to the adoption of the above structure, the utility model can be assembled according to the following steps:

[0025] The first step is to place the top cover sheet, the positive electrode column, and the negative electrode column in the injection mold, and the mold is positioned at one time, and then the plastic material (such as PPS) is injected through the injection molding equipment to form the positive electrode plastic and the negative electrode plastic, that is, the top cover sheet, the positive electrode column, the negative electrode column, the positive electrode plastic and the negative electrode plastic are connected as a top cover assembly;

[0026] The second step is to clamp the top cover assembly in the previous step upside down in a fixture, put the inverted U-shaped sealing ring in the top cover assembly, put the welding fixing ring on the inverted U-shaped sealing ring, and press the welding fixing ring down to a certain position by operating the pressing plate on the fixture, so that the inverted U-shaped sealing ring reaches the set compression position;

[0027] The third step is to weld the welding fixing ring to the top cover piece by laser welding technology, so that the welding fixing ring and the top cover assembly are matched, thereby achieving the sealing effect of an inverted U-shaped sealing ring.

[0028] The structure of the utility model allows the above-mentioned simple process to be used for assembly, and the height dimension requirements for the positive electrode column / negative electrode column are reduced, which is beneficial to reducing the cost of the positive electrode column / negative electrode column, reducing the manufacturing cost of the battery, and improving the cost performance of the battery.

[0029] Furthermore, the utility model realizes double-pass sealing (laser welder sealing, sealing ring sealing) between the top cover sheet and the positive electrode column / negative electrode column, and the air tightness is improved. In addition, since the inverted U-shaped sealing ring is isolated between the welding fixing ring and the positive electrode column / negative electrode column, it plays an insulating role. In particular, a vertical section of the inverted U-shaped sealing ring is insulated and isolated between the inner diameter of the welding fixing ring and the outer peripheral surface of the connecting protrusion of the positive electrode column / negative electrode column, which effectively avoids accidental connection between the positive electrode column / negative electrode column and the welding fixing ring, effectively improves the safety and stability of the battery, and reduces the risk of battery failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is a three-dimensional schematic diagram of the structure of the utility model;

[0031] Figure 2 for Figure 1 A full cutaway stereoscopic diagram of

[0032] Figure 3 It is a schematic diagram of the full cross-section front view of the structure of the utility model;

[0033] Figure 4 for Figure 3 An enlarged schematic diagram of point A.

[0034] In the above figures: 1, top cover sheet; 11, pole mounting hole; 12, clamping edge; 13, mounting groove;

[0035] 2. positive electrode column; 21. connecting protrusion of the positive electrode column; 22. positioning groove of the positive electrode column;

[0036] 3. Negative pole; 31. Connecting protrusion of negative pole; 32. Positioning groove of negative pole;

[0037] 4. Plastic on the positive electrode;

[0038] 5. Plastic on the negative electrode;

[0039] 6. Welding fixing ring; 61. Welding handle; 62. Pressing part; 621. Convex edge;

[0040] 7. Inverted U-shaped sealing ring; 71. Vertical section; 72. Horizontal section;

[0041] 8. Lower plastic insulating sheet; 81. Ring reinforcement structure. DETAILED DESCRIPTION

[0042] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0043] Example 1: See Figures 1 to 4 As shown, a battery cover:

[0044] See also Figures 1 to 4 As shown, the battery cover includes a top cover sheet 1, a positive electrode column 2, a negative electrode column 3, a positive electrode upper plastic 4 and a negative electrode upper plastic 5.

[0045] See also Figures 1 to 4 As shown, the top cover sheet 1 is provided with two pole mounting holes 11, the positive pole 2 and the negative pole 3 are respectively arranged in the corresponding pole mounting holes 11, the positive pole upper plastic 4 surrounds the outer periphery of the pole mounting hole 11 provided with the positive pole 2 and is isolated and connected between the positive pole 2 and the top cover sheet 1, and the negative pole upper plastic 5 surrounds the outer periphery of the pole mounting hole 11 provided with the negative pole 3 and is isolated and connected between the negative pole 3 and the top cover sheet 1.

[0046] See also Figures 2~4 As shown, a welding fixing ring 6 is fixed by laser welding on the outer periphery of each pole mounting hole 11 on the lower surface of the top cover plate 1 .

[0047] See also Figures 2~4 As shown, the positive pole 2 has a connecting protrusion 21 extending downward, and the negative pole 3 has a connecting protrusion 31 extending downward. The lower end surfaces of the connecting protrusions 21 and 31 both protrude from the pole mounting hole 11 and also protrude from the lower surface of the welding fixing ring 6 to serve as connecting surfaces.

[0048] See also Figures 2~4 As shown, an inverted U-shaped sealing ring 7 is provided between each of the welding fixing rings 6 and the positive pole 2 / negative pole 3, and the cross section of the inverted U-shaped sealing ring 7 is an inverted U-shape consisting of two vertical sections 71 extending downward and a transverse section 72 connected between the upper ends of the two vertical sections 71. The top surface of the transverse section 72 of the inverted U-shaped sealing ring 7 abuts against the positive pole 2 / negative pole 3, and the lower end surface of one vertical section 71 abuts against the upper surface of the welding fixing ring 6, and the lower end of the other vertical section 71 extends and is isolated between the inner peripheral surface of the welding fixing ring 6 and the outer periphery of the connecting protrusions 21, 31.

[0049] See also Figures 2~4 As shown, the edge of the pole mounting hole 11 of the top cover sheet 1 is bent upward and extended into the hole to form a clamping edge 12, which increases the bonding force between the top cover sheet 1 and the plastic 4 on the positive electrode and the plastic 5 on the negative electrode, so as to cooperate with the pole to clamp the inverted U-shaped sealing ring 7, and also form a space for accommodating the inverted U-shaped sealing ring 7.

[0050] For details, see Figures 2~4 As shown, the top cover sheet 1 , the positive electrode column 2 , the negative electrode column 3 , the positive electrode upper plastic 4 and the negative electrode upper plastic 5 are integrally connected by injection molding, so that the positive electrode upper plastic 4 and the negative electrode upper plastic 5 fix and cover the corresponding clamping edge 12 .

[0051] This embodiment also includes a lower plastic insulating sheet 8, which is fixedly covered on the lower surface of the top cover sheet 1 and covers the welding fixing ring 6 and the inverted U-shaped sealing ring 7, and the lower end surfaces of the positive electrode column 2 and the negative electrode column 3 protrude from the lower surface of the lower plastic insulating sheet 8.

[0052] See also Figures 2~4 As shown, an upwardly bent and arched annular structure 81 is provided on the lower plastic insulating sheet 8 at a position corresponding to the welding fixing ring 6 to avoid the internal structure of the battery and reserve a welding avoidance space for the connecting sheet welding area.

[0053] See also Figures 2~4As shown, the cross section of the welding fixing ring 6 is composed of a welding handle 61 and a pressing portion 62 extending inwardly and abutting against the inverted U-shaped sealing ring 7. The thickness of the welding handle 61 is greater than the thickness of the pressing portion 62 to avoid the internal structure of the battery and reserve a welding avoidance space for the connecting piece welding area.

[0054] Preferably, the inner edge of the pressing portion 62 is provided with a convex edge 621 protruding upward, and the convex edge 621 is located between the two vertical sections of the inverted U-shaped sealing ring 7 to position the U-shaped sealing ring 7 and prevent the U-shaped sealing ring 7 from shifting during assembly or transfer.

[0055] See also Figures 2~4 As shown, the positive electrode column 2 and the negative electrode column 3 are provided with positioning grooves 22 and 32 corresponding to the top of the inverted U-shaped sealing ring 7, so that the inverted U-shaped sealing ring 7 is positioned in the positioning grooves 22 and 32 to position the U-shaped sealing ring 7 and prevent the U-shaped sealing ring 7 from being offset during the assembly process or the transfer process.

[0056] See also Figures 2~4 As shown, a mounting groove 13 is provided on the lower surface of the top cover sheet 1 around the outer circumference of the pole mounting hole 11 , and the welding fixing ring 6 is embedded in the mounting groove 13 for positioning.

[0057] Example 2: See Figures 1 to 4 As shown, a power battery:

[0058] See also Figures 1 to 4 As shown, the power battery includes the battery cover plate of the first embodiment, and a connecting piece (not shown in the figure) is additionally provided under the battery cover plate, and the connecting action surfaces of the connecting protrusions of the positive electrode column 2 and the negative electrode column 3 are welded and connected to the connecting piece. In this way, the connecting piece only needs to be a planar structure, which is simple in structure, has low mold opening cost, and is convenient for welding operation.

[0059] This embodiment can be assembled according to the following steps:

[0060] In the first step, the top cover sheet 1, the positive electrode column 2, and the negative electrode column 3 are placed in the injection mold, and the mold is positioned at one time, and then the plastic material (such as PPS) is subjected to an injection molding process through an injection molding device to form a positive electrode upper plastic 4 and a negative electrode upper plastic 5, that is, the top cover sheet 1, the positive electrode column 2, the negative electrode column 3, the positive electrode upper plastic 4, and the negative electrode upper plastic 5 are connected as a top cover assembly;

[0061] The second step is to clamp the top cover assembly in the previous step upside down in a fixture, put the inverted U-shaped sealing ring 7 into the top cover assembly, put the welding fixing ring 6 on the inverted U-shaped sealing ring 7, and press the welding fixing ring 6 down to a certain position by operating the pressing plate on the fixture, so that the inverted U-shaped sealing ring 7 reaches the set compression position;

[0062] The third step is to weld the welding fixing ring 6 to the top cover sheet by laser welding, so that the welding fixing ring 6 and the top cover assembly are matched, thereby achieving the sealing effect of the inverted U-shaped sealing ring 7;

[0063] The fourth step is to weld a connecting piece onto the finished product of the third step, that is, to weld the connecting piece to the connecting surfaces of the connecting protrusion 21 of the positive electrode column 2 and the connecting protrusion 32 of the negative electrode column 3 .

[0064] In the above-mentioned embodiment 1 and embodiment 2, the following specific solutions may be adopted:

[0065] The top cover sheet 1 can be made of aluminum material, which can effectively meet the battery electrical performance requirements while reducing the battery weight and improving the stamping plasticity of the top cover sheet.

[0066] The inverted U-shaped sealing ring 7 is made of fluororubber material and a vulcanization manufacturing process, and has good strength and corrosion resistance. It can effectively seal the interior of the battery to prevent gas from intruding, thereby improving the safety and stability of the battery.

[0067] The positive electrode column 2 is made of aluminum, which meets the electrical performance requirements and has strong plasticity; the negative electrode column 3 is made of copper and aluminum composite materials to meet the battery electrical performance requirements and the peel strength of the copper-aluminum joint. The positive electrode column 2 and the negative electrode column 3 can be round or square.

[0068] The plastic 4 on the positive electrode and the plastic 5 on the negative electrode are made of PPS material, which has good mechanical properties and chemical corrosion resistance. By adding glass fiber, carbon fiber, etc., it has good electrical conductivity and thermal conductivity, which can effectively ensure the normal operation insulation, conductivity and mechanical strength of the battery and extend the service life of the battery; the plastic 4 on the positive electrode and the plastic 5 on the negative electrode can be selected from insulating PPS or conductive PPS as needed.

[0069] The lower plastic insulating sheet 8 is made of PP material, which can effectively isolate the battery from the internal environment, prevent heat transfer from the battery cells inside and external interference with current performance, and improve the stability and reliability of the battery.

[0070] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery cover, comprising a top cover sheet (1), a positive pole (2), a negative pole (3), a positive pole upper plastic (4) and a negative pole upper plastic (5); the top cover sheet (1) is provided with two pole mounting holes (11), the positive pole (2) and the negative pole (3) are respectively arranged in the pole mounting holes (11), the positive pole upper plastic (4) surrounds the pole mounting hole (11) arranged on the positive pole (2) and is isolated and connected between the positive pole (2) and the top cover sheet (1), and the negative pole upper plastic (5) surrounds the pole mounting hole (11) arranged on the negative pole (3) and is isolated and connected between the negative pole (3) and the top cover sheet (1); characterized in that: A welding fixing ring (6) is fixed by laser welding on the outer periphery of each pole mounting hole (11) on the lower surface of the top cover sheet (1); The positive pole (2) and the negative pole (3) have a connecting protrusion (21, 31) extending downward, and the lower end surface of the connecting protrusion (21, 31) protrudes from the pole mounting hole (11) and also protrudes from the lower surface of the welding fixing ring (6) to serve as a connecting action surface; An inverted U-shaped sealing ring (7) is provided between each of the welding fixing rings (6) and the positive electrode column (2) / negative electrode column (3). The cross section of the inverted U-shaped sealing ring (7) is an inverted U-shape consisting of two vertical sections (71) extending downward and a transverse section (72) connected between the upper ends of the two vertical sections (71); the top surface of the transverse section (72) of the inverted U-shaped sealing ring (7) abuts against the positive electrode column (2) / negative electrode column (3), the lower end surface of one vertical section (71) abuts against the upper surface of the welding fixing ring (6), and the lower end of the other vertical section (71) extends and is isolated between the inner peripheral surface of the welding fixing ring (6) and the outer periphery of the connecting protrusion (21, 31).

2. The battery cover according to claim 1, characterized in that: The edge of the pole mounting hole (11) of the top cover sheet (1) is bent upward and extended into the hole to form a snap-fit ​​edge (12); the top cover sheet (1), the positive pole (2), the negative pole (3), the positive pole upper plastic (4) and the negative pole upper plastic (5) are integrally connected by an injection molding process, so that the positive pole upper plastic (4) and the negative pole upper plastic (5) fix and cover the corresponding snap-fit ​​edge (12).

3. The battery cover according to claim 1, characterized in that: It also comprises a lower plastic insulating sheet (8), which is fixedly mounted on the lower surface of the top cover sheet (1) and covers the welding fixing ring (6) and the inverted U-shaped sealing ring (7), and the lower end surfaces of the positive electrode column (2) and the negative electrode column (3) protrude from the lower surface of the lower plastic insulating sheet (8).

4. The battery cover according to claim 3, characterized in that: An upwardly bent and arched annular reinforcement structure (81) is provided on the lower plastic insulation sheet (8) at a position corresponding to the welding fixing ring (6).

5. The battery cover according to claim 1, characterized in that: The cross section of the welding fixing ring (6) is composed of a welding handle (61) and a pressing portion (62) extending inwardly and abutting against the inverted U-shaped sealing ring (7), and the thickness of the welding handle (61) is greater than the thickness of the pressing portion (62).

6. The battery cover according to claim 5, characterized in that: The inner edge of the pressing portion (62) is provided with a convex edge (621) protruding upwards, and the convex edge (621) is located between the two vertical sections of the inverted U-shaped sealing ring (7).

7. The battery cover according to claim 1, characterized in that: Positioning grooves (22, 32) that fit in with the inverted U-shaped sealing ring (7) are provided on the positive pole (2) and the negative pole (3) at the tops corresponding to the inverted U-shaped sealing ring (7), so that the inverted U-shaped sealing ring (7) is positioned in the positioning grooves (22, 32).

8. The battery cover according to claim 1, characterized in that: A mounting groove (13) is provided on the lower surface of the top cover sheet (1) around the outer circumference of the pole mounting hole (11), and the welding fixing ring (6) is embedded in the mounting groove (13).

9. A power battery, characterized in that: The battery cover plate comprises the battery cover plate as claimed in any one of claims 1 to 8, wherein a connecting piece is provided under the battery cover plate, and the connecting surfaces of the connecting protrusions of the positive electrode column (2) and the negative electrode column (3) are welded to the connecting piece.

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