CN219435992U

CN219435992U - Secondary battery top cover

Info

Publication number: CN219435992U
Application number: CN202320338527.XU
Authority: CN
Inventors: 戈志敏; 何庆庆; 邹伟伟; 俞文强; 孙文; 唐晓伟; 黄晓伟; 张丽花; 王隽; 倪大卫; 李涛; 陶琼城
Original assignee: Jiangxi Ganfeng Lienergy Technology Co Ltd
Current assignee: Jiangxi Ganfeng Lienergy Technology Co Ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-07-28
Anticipated expiration: 2033-02-28

Abstract

The utility model provides a secondary battery top cover, which relates to the technical field of secondary batteries and comprises a cover plate, wherein the surface of the cover plate is provided with a groove, the inner wall of the groove is provided with a positioning groove, a sealing ring is arranged in the groove, a pole is arranged above the sealing ring and penetrates through the sealing ring; the welding ring is arranged in the groove, and the end part of the welding ring is clamped into the positioning groove; the grooves and the positioning grooves are sunken, and the sinking depth of the positioning grooves is 0.1mm-2mm; the one end that the recess was kept away from to the weld ring is equipped with the chamfer hook portion towards the utmost point post direction, will mould plastics the piece through the weld ring and catch, guarantees the fastening of moulding plastics the piece, guarantees the holistic joint strength of structure, and the piece encircles outside the utmost point post in addition, forms the fastening mode of staple bolt, effectively solves the poor problem of top cap utmost point post position department gas tightness.

Description

Secondary battery top cover

Technical Field

The utility model relates to the field of secondary batteries, in particular to a top cover of a secondary battery.

Background

With the increasing prominence of environmental problems, low carbon economy has become the mainstay of economic development in the future. The new energy source gradually replaces the traditional environmental pollution type energy source, and the power battery is gradually accepted by the vast manufacturers and consumers as the representative of the new energy source. The power battery is used as a main power source of the new energy automobile and becomes one of key components of the electric automobile;

as a key component of an electric automobile, a power battery has great influence on the overall automobile power performance, economy and safety.

In order to reduce the amount of plastic used in the top cover of the current power battery, a top cover comprising a top cover plate, a welding ring, a pole, an upper plastic, a lower plastic, a sealing ring and the like is developed, wherein the upper plastic is connected with the pole and the welding ring, and the welding ring is connected with the top cover plate. The prior two manufacturing processes are realized, one is that a welding ring and a pole post are connected by using plastic hot melting, and then the welding ring is welded on a top cover plate; the other is that the welding ring is welded on the top cover, then the sealing ring and the pole are put into the top cover, finally the PPS is utilized to carry out plastic, and the welding ring and the pole are fixed.

Disclosure of Invention

The utility model aims to provide a secondary battery top cover to solve the technical problems. To achieve the purpose, the utility model adopts the following technical scheme:

a secondary battery top cover includes

The surface of the cover plate is provided with a groove, and the inner wall of the groove is provided with a positioning groove;

the sealing ring is arranged in the groove;

the pole is arranged above the sealing ring and penetrates through the sealing ring;

the welding ring is arranged in the groove, and the end part of the welding ring is clamped into the positioning groove;

specific: the grooves and the positioning grooves are sunken, and the sinking depth of the positioning grooves is 0.1mm-2mm;

the welding ring can be positioned well through the sinking position of the positioning groove, the welding firmness is improved,

further preferred embodiments are as follows: one end of the welding ring, which is far away from the groove, is provided with a chamfer hook part facing the direction of the pole;

an injection cavity is arranged between the welding ring, the pole and the sealing ring, and an injection block is arranged in the injection cavity through injection molding;

specific: the welding ring is positioned in the injection molding block, and the injection molding block surrounds the pole;

through this design, the welding ring top can be with the piece of moulding plastics hooked, guarantees the fastening of the piece of moulding plastics.

Further preferred embodiments are as follows: a lower plastic is arranged below the cover plate, a metal connecting sheet is arranged at the position of the lower plastic corresponding to the groove, and the bottom end of the pole is lower than the sealing ring and is connected with the metal connecting sheet;

according to the design, the later metal connecting sheet can be connected to the electrode lug of the bare cell, so that the electrode column, the metal connecting sheet and the cell are electrically connected.

Further preferred embodiments are as follows: a gap is reserved between the inner wall of the sealing ring and the outer wall of the tail end of the pole;

this design can reduce the materials of utmost point post and rubber, reduce cost.

Further preferred embodiments are as follows: the surface of the top cover is also provided with a liquid injection hole and an explosion-proof valve.

The utility model has the beneficial effects that:

1. the welding ring enters the groove, the end part of the welding ring is clamped into the positioning groove, the welding ring is clamped into the positioning groove to a depth of 0.1-2 mm, the positioning effect can be achieved for the connection of the welding ring and the top cover through the design of the positioning groove, the welding ring can be directly inserted into the top cover to achieve the positioning effect, then the end part of the welding ring is welded with the inner wall of the groove, and the installation of the welding ring is completed;

2. the welding ring, the pole and the sealing ring are separated by an injection molding cavity, an injection molding block is formed in the injection molding cavity, the injection molding block can be hooked through a chamfer hook part of the welding ring, the fastening of the injection molding block is guaranteed, even if the sealing ring conducts rebound force to the pole, pole acting force is applied to the injection molding block, the injection molding block can be prevented from moving upwards through the chamfer hook part of the welding ring, the integral connection strength of the structure is guaranteed, the injection molding block surrounds outside the pole, and the fastening mode of the hoop is formed, so that the problem of poor air tightness of the pole position of the top cover is effectively solved.

Drawings

FIG. 1 is a schematic view of the overall assembly structure of the present utility model;

FIG. 2 is a schematic diagram of the overall split structure of the present utility model;

FIG. 3 is an overall front view of the present utility model;

FIG. 4 is a schematic view of the structure of the present utility model at A in FIG. 3;

fig. 5 is a schematic view of a partial enlarged structure at B in fig. 2 according to the present utility model.

In the figure: the anti-explosion device comprises a cover plate (1), a groove (101), a positioning groove (102), a sealing ring (2), a pole (3), a welding ring (4), an injection molding block (5), lower plastic (6), a liquid injection hole (7) and an anti-explosion valve (8).

Description of the embodiments

Referring to FIGS. 1 to 5, a secondary battery top cap includes

The cover plate 1, the surface of the cover plate 1 is provided with a groove 101, and the inner wall of the groove 101 is provided with a positioning groove 102;

the installation sequence is as follows: the sealing ring 2 is arranged in the groove 101, (as shown in fig. 4), the sealing ring 2 is preferably in a double-section shape, the section position is L-shaped, the welding ring 4 is adjusted to enter the groove 101, the end part of the welding ring 4 is clamped into the positioning groove 102, the groove 101 and the positioning groove 102 are sunken, the sinking depth of the positioning groove 102 is 0.1mm-2mm, the welding ring 4 is clamped into the positioning groove 102 by the depth of 0.1mm-2mm, the positioning effect can be achieved for the connection of the welding ring 4 and the cover plate 1 through the design of the positioning groove 102, the welding ring 4 is directly inserted into the cover plate 1, then the end part of the welding ring 4 is welded with the inner wall of the groove 101, the installation of the welding ring 4 is completed, and finally the pole 3 is lifted up to penetrate the welding ring 4, and extends into the sealing ring 2;

of course, the above installation sequence is only one example, and the pole 3 may be installed after the sealing ring 2 is installed, then the welding ring 4 is installed and the welding ring 4 is welded, and the installation sequence of the sealing ring 2, the pole 3 and the welding ring 4 may be optionally adjusted according to a well known manner by a person skilled in the art.

Referring to fig. 4, when the pole 3 is assembled inside the welding ring 4, an injection cavity is formed between the welding ring 4 and the pole 3 and between the welding ring and the sealing ring 2, PPS can be injected into the injection cavity, and after the PPS is cooled, the injection block 5 is formed;

the welding ring 4 is located inside the injection molding block 5, and the welding ring 4 is kept away from the chamfer hook portion that recess 101's one end was equipped with towards the pole 3 direction, can catch on the injection molding block 5 through the chamfer hook portion of welding ring 4, guarantee the fastening of injection molding block 5, even sealing washer 2 is conducted rebound force to pole 3, pole 3 effort is in injection molding block 5, can prevent also through the chamfer hook portion of welding ring 4 that injection molding block 5 from upwards moving, guarantee the holistic joint strength of structure, in addition injection molding block 5 encircles outside pole 3, form the fastening mode of staple bolt, effectively solve the poor problem of top cap pole 3 position department gas tightness.

Referring to fig. 1, 2 and 4, a lower plastic 6 is installed below the cover plate 1, a metal connecting sheet is arranged at a position of the lower plastic 6 corresponding to the groove 101, the bottom end of the pole 3 is lower than the sealing ring 2 and is connected with the metal connecting sheet, and the pole can be connected with the pole lug of the bare cell through the metal connecting sheet, so that the bare cell, the metal connecting sheet and the pole 3 are electrically connected, and the surface of the top cover is also provided with a liquid injection hole 7 and an explosion-proof valve 8, so that the functions of liquid injection and safety pressure relief are achieved;

a gap is reserved between the inner wall of the sealing ring 2 and the outer wall of the tail end of the pole 3, so that the consumption of the sealing ring 2 and the pole 3 can be reduced, and the cost is reduced.

Claims

1. A secondary battery top cover, characterized by comprising

the sealing ring is arranged in the groove;

and the welding ring is arranged in the groove, and the end part of the welding ring is clamped into the positioning groove.

2. The secondary battery top cover according to claim 1, wherein: the grooves and the positioning grooves are sunken, and the sinking depth of the positioning grooves is 0.1mm-2mm.

3. The secondary battery top cover according to claim 1, wherein: one end of the welding ring, which is far away from the groove, is provided with a chamfer hook part facing the direction of the pole;

an injection cavity is arranged between the welding ring, the pole and the sealing ring, and an injection block is arranged in the injection cavity through injection molding.

4. A secondary battery top cover according to claim 3, wherein: the welding ring is positioned inside the injection molding block, and the injection molding block surrounds the pole.

5. The secondary battery top cover according to claim 1, wherein: the lower plastic is arranged below the cover plate, a metal connecting sheet is arranged at the position of the lower plastic corresponding to the groove, and the bottom end of the pole is lower than the sealing ring and connected with the metal connecting sheet.

6. The secondary battery top cover according to claim 1, wherein: and a gap is reserved between the inner wall of the sealing ring and the outer wall of the tail end of the pole.

7. The secondary battery top cover according to claim 1, wherein: the surface of the top cover is also provided with a liquid injection hole and an explosion-proof valve.