CN213483914U

CN213483914U - Negative electrode cover plate assembly of circular battery

Info

Publication number: CN213483914U
Application number: CN202022210639.6U
Authority: CN
Inventors: 王正伟; 钱建峰; 丁坤; 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 negative pole apron subassembly, including mass flow body and apron, its characterized in that: be equipped with the mass flow body support, the mass flow body support is a loop forming element, and one side of loop forming element has the breach, the mass flow body has mass flow body and collection fluid connecting portion, mass flow body fixed connection be in the upper portion of mass flow body support, mass flow body connecting portion be located loop forming element breach one side and with apron fixed connection, mass flow body connecting portion have flexible bending structure and make the apron be located the mass flow body support below under the mounted state. The utility model discloses guaranteed the installation reliability of mass flow body, obtained bigger welding area, made the ability of overflowing of battery stronger.

Description

Negative electrode 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 negative pole apron subassembly.

Background

In the electrode lead-out structure of a circular battery, a current collector welding structure is generally adopted for the electrode lead-out of the full tab.

For example, chinese patent application CN110600795A discloses a lithium ion cylindrical battery, which includes a winding core, a casing, and a current collecting disc, wherein the height of the winding core is smaller than that of the casing, the casing is cylindrical, the winding core is located inside the casing, two ends of the winding core are provided with tabs, one end is a positive tab, the other end is a negative tab, and the end surface of the winding core tab is an annular step surface; the current collecting discs of the positive electrode and the negative electrode are provided with circular grooves which are welding areas; and the annular step surface on the lug is attached to the annular groove on the current collecting disc for welding, and a set distance is reserved between the head and the tail of a welding track during welding. According to the technical scheme, electrode extraction is achieved through the current collecting disc, however, the arrangement of the positive current collecting disc can affect liquid injection and formation of the battery, only the negative electrode extraction structure is considered, firstly, the current collecting disc is provided with the annular groove which can be attached to the shape of a lug of the annular step surface, but the welding area of the inner ring and the welding area of the outer ring are reduced, extraction current of a part of winding layers is affected, meanwhile, a large space exists between the current collecting disc and the shell, and the problems that welding falling is easy to occur when the current collecting disc is vibrated and extruded, and the normal use of the battery is affected.

In chinese application CN109088037A, a current collecting plate welding structure for a cylindrical battery is disclosed, wherein an aluminum pole piece includes a current collecting plate portion and a connecting portion, a copper pole piece and a positive cover plate are sequentially disposed above the connecting portion from top to bottom and fixed to the connecting portion, a plate sleeve is sleeved on the periphery of the current collecting plate portion and fixed to the current collecting plate portion, and the plate sleeve is made of an insulating material. The structure ensures the stability of the current collecting disc by arranging the disc sleeve, and can increase the welding diameter of the current collecting disc. If this structure is applied to the negative electrode cap plate, there are the following problems: the disc sleeve and the current collecting disc are positioned through the positioning columns, so that a plurality of fan-shaped areas of the current collecting disc are isolated from the battery cell through the disc sleeve, the current collecting disc can only be welded with the tabs through a plurality of welding grooves, the radial welding range is enlarged, the circumferential welding area is reduced, and the current leading-out effect is influenced. Meanwhile, the structure is arranged by sleeving the disc sleeve and the flow collecting disc, so that the welding difficulty is increased.

Accordingly, there is a need to provide an improved cathode cover plate assembly.

Disclosure of Invention

The utility model aims at providing a circular battery's negative pole apron subassembly to increase the drainage ability of negative pole, simplify the processing technology that the negative pole was drawn forth simultaneously.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows: the utility model provides a circular battery's negative pole apron subassembly, includes the mass flow body and apron, is equipped with the mass flow body support, the mass flow body support is a loop forming element, and one side of loop forming element has the breach, the mass flow body has mass flow body and current collection body connecting portion, mass flow body fixed connection be in the upper portion of the mass flow body support, the mass flow body connecting portion be located loop forming element breach one side and with apron fixed connection, the mass flow body connecting portion have flexible bending structure make the apron be located the mass flow body support below under the mounted state.

Among the above-mentioned technical scheme, mass flow body fixed connection is on the upper portion of mass flow body support, from this, the mass flow body support can not shelter from mass flow body and electric core, can make and have great welding range between the negative pole extension of mass flow body and electric core to guarantee the homogeneity of electric current and the current capacity of electrode. Meanwhile, the current collector support also provides a positioning reference for the installation of the cover plate, so that the installation of the negative electrode cover plate assembly is facilitated.

According to the technical scheme, the current collector body is mainly in a wafer shape, the periphery of the current collector body is provided with a downward bending structure, and the ring-shaped piece wraps the plastic piece of the downward bending structure in an injection molding mode, so that the current collector body and the ring-shaped piece form an integrated structure.

Among the above-mentioned technical scheme, the current collector body is last to have the enhancement recess of the radial setting of a plurality of, and the sectorial part between the adjacent enhancement recess constitutes negative pole welded connection portion.

And a circular through hole is formed in the center of the current collector body.

According to the preferable technical scheme, 4 reinforcing grooves are arranged, the reinforcing grooves are uniformly arranged on a wafer at intervals of 90 degrees, and the notch is located between two reinforcing grooves.

Wherein the radian of the gap on the circumference is between 60 and 90 degrees.

In the technical scheme, the current collector connecting part and the current collector body are of an integrated structure, and one end of the current collector connecting part is welded and fixed on the cover plate.

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

1. the utility model ensures the installation reliability of the current collector by arranging the current collector bracket which is fixedly connected with the current collector, obtains larger welding area and leads the overcurrent capacity of the battery to be stronger;

2. the current collector support can adopt a plastic piece, the injection molding process is utilized to enable the current collector support to be wrapped and connected with the current collector body when being molded, and the current collector support and the current collector body form an integrally molded structure, so that the current collector support is convenient to install.

Drawings

Fig. 1 is an expanded schematic view of an embodiment of the present invention;

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

FIG. 3 is an enlarged schematic view of section B of FIG. 2;

fig. 4 is a schematic structural view of the negative electrode cover plate assembly mounted on the battery in the embodiment.

Wherein: 1. a current collector; 2. a current collector support; 3. a cover plate; 4. a notch; 5. a current collector body; 6. a current collector connecting part; 7. a bending part; 8. reinforcing the grooves; 9. and a negative electrode welding connection part.

Detailed Description

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

example 1: referring to fig. 1, a negative electrode cover plate assembly of a circular battery, including the current collector 1, the current collector support 2 and the cover plate 3, the current collector support 2 is a ring-shaped member, one side of the ring-shaped member has a notch 4, the current collector 1 can be a stamped metal sheet, and is divided into a current collector body 5 and a current collector connecting part 6 from the aspect of function, wherein, the current collector body 5 is mainly in a wafer shape, refer to fig. 2 and fig. 3, the current collector body periphery has a downward bending part 7, the annular current collector support 2 is formed by injection molding, wrap up the bending part 7, so that the current collector body and the ring-shaped member form an integrated structure, and the current collector body 5 is located on the upper part.

The current collector body 5 is provided with 4 reinforcing grooves 8 which are radially arranged, the reinforcing grooves 8 are uniformly arranged on a wafer at intervals of 90 degrees, and the fan-shaped parts between the adjacent reinforcing grooves 8 form a negative electrode welding connection part 9. The gap 4 is located between two of the reinforcing grooves. The central part of the current collector body is provided with a round through hole.

The current collector connecting part 6 is positioned on one side of the gap of the ring-shaped part, the outer end of the current collector connecting part is welded and fixed on the cover plate 3, and referring to the attached drawing 4, the current collector connecting part 6 is provided with a flexible bending structure to enable the cover plate to be positioned below the current collector support in an installation state.

Because mass flow body fixed connection is on the upper portion of mass flow body support, the mass flow body support can not shelter from mass flow body and electric core, can make and have great welding scope between the negative pole extension of mass flow body and electric core to guarantee the homogeneity of electric current and the current capacity of electrode. Meanwhile, the current collector support also provides a positioning reference for the installation of the cover plate, so that the installation of the negative electrode cover plate assembly is facilitated.

Claims

1. The utility model provides a circular battery's negative pole apron subassembly, includes the mass flow body and apron, its characterized in that: be equipped with the mass flow body support, the mass flow body support is a loop forming element, and one side of loop forming element has the breach, the mass flow body has mass flow body and collection fluid connecting portion, mass flow body fixed connection be in the upper portion of mass flow body support, mass flow body connecting portion be located loop forming element breach one side and with apron fixed connection, mass flow body connecting portion have flexible bending structure and make the apron be located the mass flow body support below under the mounted state.

2. The negative electrode cover plate assembly for a circular battery according to claim 1, wherein: the current collector body is mainly in a wafer shape, a downward bending structure is arranged on the periphery of the current collector body, and the annular piece wraps the plastic piece of the downward bending structure through injection molding, so that the current collector body and the annular piece form an integral structure.

3. The negative electrode cover plate assembly for a circular battery according to claim 2, wherein: the body of the current collector is provided with a plurality of radial strengthening grooves, and the fan-shaped parts between the adjacent strengthening grooves form a negative electrode welding connection part.

4. The negative electrode cover plate assembly for a circular battery according to claim 2, wherein: and a circular through hole is formed in the center of the current collector body.

5. The negative electrode cover plate assembly for a circular battery according to claim 3, wherein: the reinforcing groove is provided with 4 reinforcing grooves, the reinforcing grooves are uniformly arranged on the wafer at intervals of 90 degrees, and the notch is positioned between two reinforcing grooves.

6. The negative electrode cover plate assembly for a circular battery according to claim 5, wherein: the radian of the gap on the circumference is 60-90 degrees.

7. The negative electrode cover plate assembly for a circular battery according to claim 1, wherein: the current collector connecting part and the current collector body are of an integral structure, and one end of the current collector connecting part is welded and fixed on the cover plate.