CN-224232889-U - Battery cell, battery device and electricity utilization device

CN224232889UCN 224232889 UCN224232889 UCN 224232889UCN-224232889-U

Abstract

The application discloses a battery unit, a battery device and an electric device, wherein the battery unit comprises a shell, an electrode assembly, an electrode terminal and an insulating piece, wherein the shell is provided with a containing cavity, the shell is provided with a first wall, the electrode assembly is arranged in the containing cavity, the electrode terminal is arranged on the first wall and is electrically connected with the electrode assembly, the electrode terminal comprises a conductive piece, the conductive piece is arranged on one side of the first wall, which is away from the electrode assembly, the insulating piece is at least partially arranged between the conductive piece and the first wall, the conductive piece is provided with a first surface facing the insulating piece, the insulating piece is provided with a second surface facing the conductive piece, the first surface and/or the second surface is provided with an avoidance groove, and the orthographic projection of the first solder printing on the first surface or the second surface at least partially falls into the range of the avoidance groove. According to the scheme provided by the application, when the conductive member is welded with the converging part, heat generated at the first welding position is not transferred to the insulating member under the limit of the avoidance groove, so that the insulating member can be prevented from being burnt, and the reliability of the battery cell is improved.

Inventors

LI CHUAN
WU GUANGJIN
GUO ZHIJUN
CHEN BINBIN
YANG DONGDONG

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250327

Claims (12)

1. A battery cell, comprising: A housing having a receiving cavity, the housing having a first wall; an electrode assembly disposed in the receiving chamber; The electrode terminal is arranged on the first wall and is electrically connected with the electrode assembly, and comprises a conductive piece which is arranged on one side of the first wall, which is away from the electrode assembly, and is connected with the bus component through a first welding mark; an insulating member at least partially disposed between the conductive member and the first wall; Wherein the conductive member has a first surface facing the insulating member, the insulating member has a second surface facing the conductive member, and the first surface and/or the second surface are provided with relief grooves; The orthographic projection of the first welding mark on the first surface or the second surface at least partially falls into the range of the avoidance groove.
2. The battery cell of claim 1, wherein the first surface is provided with a first relief groove, and wherein all orthographic projections of the first solder marks on the first surface fall into the first relief groove.
3. The battery cell of claim 2, wherein the first relief groove has a depth D1 in a first direction and the conductive member has a dimension D2 in the first direction, wherein 0< D1/D2 is less than or equal to 0.5, and wherein the first direction is a direction from a side of the conductive member facing away from the insulating member to the first surface.
4. The battery cell of claim 1, wherein the second surface is provided with a second relief groove, and the orthographic projection of the first solder mark on the second surface falls into the second relief groove.
5. The battery cell of claim 4, wherein the second relief groove has a depth D3 in a first direction and the insulator has a dimension D4 in the first direction, wherein 0< D3/D4 is less than or equal to 1.
6. The battery cell of any one of claims 1 to 5, wherein a side of the first wall facing the conductive member is provided with a recess, and the insulating member is located in the recess.
7. The battery cell as recited in claim 6, wherein the insulating member comprises a bottom wall and a side wall disposed about a periphery of the bottom wall, the side wall and the bottom wall being enclosed in a concave configuration, the conductive member being disposed within the concave configuration; The second avoidance groove on the second surface is arranged on the bottom wall, the side wall is abutted with the inner wall of the groove along the second direction, and the second direction is perpendicular to the first direction.
8. The battery cell as recited in claim 7, wherein the surface of the conductive member to which the bus member is connected is a third surface, and the side wall does not protrude beyond the third surface in the first direction.
9. The battery cell according to claim 1, wherein the electrode terminal further comprises a connection part, the conductive member is provided with a first through hole, and the insulating member is provided with a second through hole; One end of the connecting part is electrically connected with the electrode assembly, and the other end of the connecting part sequentially passes through the second through hole and the first through hole along the first direction and then is electrically connected with the conductive piece.
10. The battery cell of claim 9, further comprising a seal at least partially between the first wall and the connection.
11. A battery device comprising the battery cell of any one of claims 1 to 10 and a bus member connected to the conductive member by the first solder.
12. An electrical device comprising the battery device of claim 11.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery device and an electricity utilization device. Background Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. In the development of battery technology, how to improve the reliability of a battery device is a technical problem that needs to be solved in battery technology. Disclosure of utility model In view of the above, the present application provides a battery cell, a battery device, and an electric device, which can improve the reliability of the battery device. In order to solve the above technical problems, in a first aspect, the present application provides a battery cell, including: A housing having a receiving cavity, the housing having a first wall; an electrode assembly disposed in the receiving chamber; The electrode terminal is arranged on the first wall and is electrically connected with the electrode assembly, and comprises a conductive piece which is arranged on one side of the first wall, which is away from the electrode assembly, and is connected with the bus component through a first welding mark; an insulating member at least partially disposed between the conductive member and the first wall; Wherein the conductive member has a first surface facing the insulating member, the insulating member has a second surface facing the conductive member, and the first surface and/or the second surface are provided with relief grooves; The orthographic projection of the first welding mark on the first surface or the second surface at least partially falls into the range of the avoidance groove. In the technical scheme of the embodiment of the application, the avoidance grooves are formed in the first surface and the second surface, and the orthographic projection of the first welding mark on the first surface or the second surface at least partially falls into the range of the avoidance grooves, so that when the conductive piece and the converging part are welded, heat generated at the first welding mark is not transferred to the insulating piece under the limitation of the avoidance grooves, thereby avoiding the insulating piece from being burnt, ensuring the sealing effect between the conductive piece and the first wall and improving the reliability of the battery monomer. In some embodiments, a first avoidance groove is formed on the first surface, and all orthographic projections of the first solder marks on the first surface fall into the first avoidance groove. Therefore, the size of the first avoiding groove is larger than that of the first welding mark, and heat generated by the first welding mark is prevented from being transferred from the edge of the first avoiding groove. In some embodiments, the first relief groove has a depth D1 in a first direction, and the conductive member has a dimension D2 in the first direction, where 0< D1/D2 is less than or equal to 0.5, and the first direction is a direction from a side of the conductive member facing away from the insulating member to the first surface. Therefore, a certain thickness of the conductive piece at the first welding position can be ensured, and the phenomenon of welding through caused by the fact that the conductive piece is thinner when the conductive piece is welded with the bus component is avoided. In some embodiments, a second avoidance groove is formed on the second surface, and all orthographic projections of the first solder marks on the second surface fall into the second avoidance groove. In this way, the size of the second avoidance groove is larger than that of the first welding mark, and heat generated by the first welding mark is prevented from being transferred to the edge of the second avoidance groove, so that the insulating part is burnt. In some embodiments, the second relief groove has a depth D3 in a first direction and the insulator has a dimension D4 in the first direction, wherein 0< D3/D4 is less than or equal to 1. Therefore, when D3 is equal to D4, the second avoidance groove penetrates through the insulating piece along the second direction, and accordingly the situation that the second avoidance groove receives heat generated at the first welding position can be effectively avoided. In some embodiments, a groove is provided in a side of the first wall facing the conductive member, and the insulating member is located in the groove. In this way, the insulator can be conveniently fixed to the first wall. In some embodiments, the insulating member comprises a bottom