CN-224217577-U - Cover plate assembly and high-rate cylindrical battery

CN224217577UCN 224217577 UCN224217577 UCN 224217577UCN-224217577-U

Abstract

The utility model discloses a cover plate assembly and a high-rate cylindrical battery, which comprises a cover plate and a confluence sheet, wherein a conductive handle formed by extending along the radial direction is arranged on the confluence sheet, one end of the conductive handle, which is far away from the confluence sheet, is connected with the inner side of the cover plate, a welding area formed by recessing is arranged on the confluence sheet, the welding area is oppositely protruded towards the side where the cover plate is positioned in an unfolded state of the conductive handle, a plurality of welding areas are uniformly distributed along the circumferential direction of the confluence sheet, a pre-folding line is arranged on the conductive handle, the pre-folding line is positioned on the middle vertical line of the connecting line of the cover plate and the confluence sheet, and the cover plate is coaxially covered on the confluence sheet in a turnover manner along the pre-folding line. The utility model has the advantages of reasonable structural design, shortened length of the conductive handle, reduced internal resistance of the battery, reduced heat productivity and the like.

Inventors

LIU JIPENG
GAO HONGJIAO
TANG LIANXING
FENG SHUNAN
HE WEI

Assignees

蓝京新能源(嘉兴)有限公司

Dates

Publication Date: 20260508
Application Date: 20250410

Claims (10)

1. The cover plate assembly comprises a cover plate (1) and a bus plate (2), wherein the bus plate (2) is provided with a conductive handle (3) which is formed by extending along the radial direction, the cover plate assembly is characterized in that one end, far away from the bus plate (2), of the conductive handle (3) is connected with the inner side of the cover plate (1), the bus plate (2) is provided with a welding area (4) which is formed by recessing, the welding area (4) is oppositely protruded towards the side where the cover plate (1) is located in an unfolded state of the conductive handle (3), the welding area (4) is uniformly distributed along the circumferential direction of the bus plate (2), the conductive handle (3) is provided with a pre-folding line (5), the pre-folding line (5) is located on a perpendicular line of a connecting line of the cover plate (1) and the bus plate (2), and the cover plate (1) is coaxially covered on the bus plate (2) along the pre-folding line (5).
2. The cover plate assembly according to claim 1, wherein the welding area (4) is integrally arranged in a strip-like extending manner along the radial direction of the bus bar (2), and the welding area (4) is located outside the coverage area of the cover plate (1) when the conductive handle (3) is in an unfolded state.
3. A cover plate assembly according to claim 2, wherein the lands (4) are provided with four, and two of the lands (4) on the same side in the width direction of the conductive shank (3) are connected to each other in a V-shape.
4. A cover plate assembly according to claim 3, wherein the side of the busbar sheet (2) facing away from the conductive handle (3) is provided with a V-shaped weight-reducing groove, the sides of which are adjacent to the corresponding welding zone (4).
5. Cover plate assembly according to claim 1, characterized in that the middle part of the busbar plate (2) is provided with a concentrically arranged central hole, the edge of which protrudes in the direction towards the cover plate (1) to form an annular boss, the outer diameter of which matches the inner diameter of the central hole of the winding core to be assembled.
6. A high-rate cylindrical battery, comprising a case and a winding core, wherein one end of the winding core is welded with the cover plate assembly according to any one of claims 1 to 5.
7. The high-rate cylindrical battery according to claim 6, wherein the inner wall of the case has an insulating coating layer annularly coated in a circumferential direction, the insulating coating layer being located at an end position of the case and disposed at least one end of the case.
8. The high-rate cylindrical battery according to claim 7, wherein the thickness of the insulating coating is 5-20 micrometers and the width is 5-20 mm.
9. The high-rate cylindrical battery according to claim 7, wherein the insulating coating is provided on the case using a thermal compounding, spraying or bonding process.
10. The high-rate cylindrical battery according to claim 7, wherein the insulating coating is made of PP, PTFE, PPS, PFA, electrodeless oxide or insulating paint.

Description

Cover plate assembly and high-rate cylindrical battery Technical Field The utility model relates to the technical field of cylindrical batteries, in particular to a cover plate assembly and a high-rate cylindrical battery. Background At present, with the rapid development of new energy industry, the requirements of society on energy density, safety performance, quick charge performance and the like of lithium ion batteries are further improved, and a large cylindrical battery is taken as a solution to be accepted, so that a wide market space is met. In the existing mass production application, most of positive and negative terminals of the cylindrical battery are connected with a cover plate through a conductive handle, and during assembly, a bus piece is connected with the cover plate through the conductive handle and then welded with a tab, and the conductive handle is positioned between the cover plate and a winding core and needs to be folded twice, so that the cover plate and the winding core are coaxial in a Z-shaped folding mode as shown in fig. 1. Because the conductive handle needs to meet Z-shaped folding, the length of the conductive handle needs to be longer, so that the internal resistance is increased, the heating value is large when the current passes through the conductive handle, and the conductive handle is not suitable for a high-magnification use scene. Disclosure of utility model Aiming at the defects of the prior art, the utility model aims to provide a cover plate assembly and a high-multiplying-power cylindrical battery which have reasonable structural design, can shorten the length of a conductive handle, and are beneficial to reducing the internal resistance and the heating value of the battery. In order to solve the technical problems, the utility model adopts the following technical scheme: The cover plate assembly comprises a cover plate and a bus plate, wherein the bus plate is provided with a conductive handle which is formed by extending along the radial direction, one end of the conductive handle, which is far away from the bus plate, is connected with the inner side of the cover plate, the bus plate is provided with a welding area which is formed by recessing, the welding area is oppositely protruded towards the side where the cover plate is located in an unfolded state of the conductive handle, a plurality of welding areas are uniformly distributed along the circumferential direction of the bus plate, the conductive handle is provided with pre-folding lines, the pre-folding lines are positioned on the middle vertical line of the connecting lines of the cover plate and the bus plate, and the cover plate is coaxially covered on the bus plate in a folding way along the pre-folding lines. In the above structure, the welding area of the bus piece is oppositely arranged to protrude towards the side where the cover plate is located in the unfolded state of the conductive handle, after the conductive handle is connected with the cover plate, the welding area of the bus piece is welded and connected towards the tab of the winding core, and the cover plate is located on the side where the conductive handle faces towards the winding core, namely, the cover plate is reversely arranged. Because the pre-folding line of the conductive handle is positioned on the middle vertical line of the cover plate and the bus piece, namely, the distance between the pre-folding line and the center of the cover plate is equal to that between the pre-folding line and the center of the bus piece, the cover plate can be just covered on the bus piece after being folded by 180 degrees along the pre-folding line, and the cover plate is coaxial with the winding core. Because the conductive handle only needs to be folded once, compared with the Z-shaped folding structure, the length of the conductive handle can be shortened by more than 15%, the internal resistance of the conductive handle is reduced, the heating value under the condition of large current is reduced, and the high-rate charging and discharging capacity is improved. Further, the whole welding area is arranged in a strip-shaped extending mode along the radial direction of the bus sheet, and the welding area is located outside the coverage range of the cover plate in the unfolded state of the conductive handle. Therefore, the welding area can be completely exposed, and the bus bar is conveniently and reliably welded and connected with the tab of the winding core through the welding area. Furthermore, the welding areas are provided with four welding areas, and two welding areas which are positioned on the same side in the width direction of the conductive handle are connected with each other to form a V shape. Further, one side of the bus plate, which is away from the conductive handle, is provided with a V-shaped weight-reducing groove, and two sides of the weight-reducing groove are close to the corresponding welding area. Therefore, the weight r