CN213483849U

CN213483849U - Positive cover plate assembly of circular battery

Info

Publication number: CN213483849U
Application number: CN202022210638.1U
Authority: CN
Inventors: 王正伟; 丁坤; 钱建峰; 刘付召
Original assignee: Xingheng Power Supply Chuzhou Co ltd
Current assignee: Xingheng Power Supply Chuzhou Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-06-18
Anticipated expiration: 2030-09-30

Abstract

The utility model discloses a circular battery's positive plate cover subassembly, a serial communication port, include: the safety valve cover plate comprises a circular sheet-shaped battery cover plate, wherein a through hole is formed in the center of the battery cover plate, a step structure is arranged on the periphery of the through hole, a liquid injection hole is formed in the through hole, and the through hole and the step structure on the periphery of the through hole form a safety valve mounting position together; the safety valve is fixed at the safety valve installation position in a battery delivery state; and the sealing body is of an annular structure, is arranged around the periphery of the battery cover plate and is fixedly connected with the battery cover plate. The utility model discloses set up at central authorities and annotate liquid hole and relief valve, both positions are multiplexing, constitute a body structure with the seal through pouring and battery apron, have simplified the mounting process of battery apron, have improved the yields.

Description

Positive cover plate assembly of circular battery

Technical Field

The utility model relates to a circular battery's structure, concretely relates to columniform lithium cell, especially circular lithium cell's positive plate cover subassembly.

Background

The lithium battery is an important new energy battery. When the electrolyte is applied to a power battery, because the battery capacity is high and the discharge current is large, the internal pressure is increased due to the gas generation of the internal electrolyte in the use process, and potential safety hazards are more easily generated. Especially for cylindrical batteries, how to enhance the safety of the cylindrical batteries is a first consideration in the design process.

The Chinese patent application CN106025112A discloses an anode lithium battery cover plate, which comprises a cover plate body, an anode screw seat, an anode pole, rivets, an anode connecting sheet and an explosion-proof valve, wherein the cover plate body is of a circular structure, the anode screw seat is arranged in the middle of the front surface of the cover plate body, the anode pole is arranged in the middle of the anode screw seat and is 6mm higher than the anode screw seat, the rivets are respectively arranged on the anode screw seat and are positioned at the left end and the right end of the anode pole, the anode connecting sheet is fixedly connected to the back surface of the cover plate body through the rivets, the explosion-proof valve is arranged at the upper part of the anode screw seat, and the end part of the anode connecting sheet is of a semicircular structure. This technical scheme sets up anodal utmost point post at apron central authorities, sets up explosion-proof valve and notes liquid hole respectively in both sides to connect the anodal pole piece of battery through the connection piece, though the security performance of battery that has improved through setting up of explosion-proof valve, nevertheless from overall structure, there is following defect: (1) the explosion-proof valve and the liquid injection hole are respectively arranged at two sides of the cover plate, the cover plate has a plurality of sealing points, and the preparation and installation process is complex; (2) because the pole piece group in the circular battery adopts a vertical winding structure, the winding center is a through hole, and the liquid injection hole is positioned at the side edge of the cover plate, so that the liquid injection speed can be influenced.

On the other hand, when the battery cover plate is installed, a mechanical rolling mode is generally adopted, an insulating sealing element is arranged around the battery cover plate, and in the rolling process, the pressing wheel pushes the cylindrical shell to press the insulating sealing element to deform and cover and press the periphery of the battery cover plate, so that insulation and sealing are realized. In this process, since the insulating sealing member and the battery lid are two separate members, displacement is easily generated at the time of mounting, resulting in an increase in defective rate.

Therefore, there is a need for an improved structure of the positive electrode cover plate assembly of the circular battery to overcome the above-mentioned drawbacks.

Disclosure of Invention

The utility model aims at providing a circular battery's positive plate cover subassembly through the institutional advancement, simplifies the structure of apron subassembly when guaranteeing battery security, promotes the notes liquid performance simultaneously.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows: a positive electrode cover plate assembly of a circular battery comprises:

the safety valve cover plate comprises a circular sheet-shaped battery cover plate, wherein a through hole is formed in the center of the battery cover plate, a step structure is arranged on the periphery of the through hole, a liquid injection hole is formed in the through hole, and the through hole and the step structure on the periphery of the through hole form a safety valve mounting position together;

the safety valve is fixed at the safety valve installation position in a battery delivery state;

and the sealing body is of an annular structure, is arranged around the periphery of the battery cover plate and is fixedly connected with the battery cover plate.

In the technical scheme, the disk-shaped battery cover plate sequentially comprises a through hole, a safety valve mounting area, an electrode leading-out area and a sealing body mounting area from inside to outside.

During the preparation, battery apron and seal at first fixed connection become an organic whole structure, during the installation, weld battery positive pole utmost point ear connecting portion inboard at the battery apron earlier, put into circular battery casing again, can place insulating gasket between positive battery apron subassembly and the electric core subassembly, then adopt mechanical rolling method to fix the battery casing to the seal, accomplish the fixed of battery apron. After the battery is assembled, electrolyte is injected by taking the central through hole as the liquid injection hole, and finally the safety valve is welded to the safety valve installation position to seal the central through hole.

In the technical scheme, the peripheral thickness of the battery cover plate is smaller than the whole thickness of the cover plate to form a sealing body fixing part, and the sealing body is wrapped on the sealing body fixing part.

According to the preferable technical scheme, the sealing body and the battery cover plate form an integral structure in a pouring mode. In order to better connect the cast sealing body and the battery cover plate, a step, a protrusion or a groove can be arranged on the sealing body fixing part.

According to a further technical scheme, the safety valve is composed of a safety valve body and a safety valve cap, the step structure on the periphery of the through hole is a two-layer structure with a deep middle part and a shallow periphery, the through hole, a deep first layer step and a shallow second layer step are arranged from inside to outside, the periphery of the safety valve body is fixed on the first layer step, and the safety valve cap is fixed on the second layer step.

In the above technical solution, the safety valve body may adopt various structures suitable for being installed at the through hole in the prior art, such as a film blasting structure, a needle punching structure, and the like.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. the utility model changes the traditional thinking that the pole is arranged in the center of the battery cover plate in the prior art, and utilizes the middle annular part of the disk cover plate to draw out the electrode, thereby arranging the liquid injection hole and the safety valve in the center, and effectively improving the liquid injection speed through the central liquid injection;

2. the utility model arranges the liquid injection hole and the safety valve at the same position, completes the sealing of the liquid injection hole when welding the safety valve, saves the sealing process of the liquid injection hole;

3. the utility model discloses constitute an organic whole structure with the seal through the pouring with the battery apron, simplified the mounting process of battery apron, improved the yields.

Drawings

Fig. 1 is a top view of a positive plate cover assembly according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is an exploded schematic view of FIG. 2;

fig. 4 is a schematic view of the installation state of the embodiment.

Wherein, 1, battery cover plate; 2. a safety valve body; 3. a safety valve cap; 4. a seal body; 5. a through hole; 6. a first step; 7. a second level of steps; 8. a seal body fixing portion; 9. a positive electrode tab; 10. an electrode lead-out section; 11. a housing.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

example 1: referring to fig. 1 to 3, a positive plate assembly of a circular battery is composed of a disk-shaped battery cover plate 1, a safety valve body 2, a safety valve cover cap 3 and a sealing body 4.

Wherein, the center of battery apron is equipped with through-hole 5, and the periphery of through-hole 5 has two-layer stair structure, is darker first layer step 6 and shallower second floor step 7 respectively, and safety valve body 2 installs on first layer step 6, and safety valve block 3 installs on second floor step 7.

Seal 4 is the loop configuration, and for the installation that adapts to seal 4, the peripheral thickness of battery apron 1 is less than the whole thickness of apron, forms seal fixed part 8, makes seal 4 parcel on seal fixed part 8 through the pouring mode, for increasing the integrative performance of contact surface in order to guarantee seal and battery apron, has the step on the seal fixed part 8.

Referring to fig. 4, which is a schematic diagram of a use state of this embodiment, a bottom side of the battery cover plate 1 is welded to a positive electrode tab 9 in the battery core, so that an annular portion of the battery cover plate forms an electrode lead-out portion 10, and a casing 11 of the battery is rolled to wrap the sealing body, thereby fixing the positive electrode cover plate assembly and the battery.

Claims

1. A positive electrode cover plate assembly of a circular battery, comprising:

2. The positive electrode cover plate assembly for a circular battery according to claim 1, wherein: the peripheral thickness of the battery cover plate is smaller than the whole thickness of the cover plate, a sealing body fixing part is formed, and the sealing body is wrapped on the sealing body fixing part.

3. The positive electrode cover plate assembly of a circular battery according to claim 2, wherein: the sealing body and the battery cover plate form an integral structure in a pouring mode.

4. The positive electrode cover plate assembly of a circular battery according to claim 2, wherein: the sealing body fixing part is provided with a step, a bulge or a groove.

5. The positive electrode cover plate assembly for a circular battery according to claim 1, wherein: the safety valve is composed of a safety valve body and a safety valve cap, the step structure on the periphery of the through hole is a two-layer structure with a deep middle part and a shallow periphery, the through hole, a deep first-layer step and a shallow second-layer step are arranged from inside to outside respectively, the periphery of the safety valve body is fixed on the first-layer step, and the safety valve cap is fixed on the second-layer step.