EP-4738557-A1 - BATTERY CELL, BATTERY AND ELECTRIC DEVICE

Abstract

The present application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes a housing, an electrode terminal, and an insulating member. The housing has a first wall, where the first wall has a first through hole. The electrode terminal is disposed in the first through hole, and along a first direction, the electrode terminal has a first end, where the first direction is parallel to a thickness direction of the first wall. At least a portion of the insulating member is disposed between the electrode terminal and a wall of the first through hole, and the insulating member connects the electrode terminal and the first wall. Along the first direction, a projection of the first end does not overlap with a projection of the insulating member. The technical solutions provided by the present application can improve the reliability of the battery.

Inventors

• WU, KAI
• LI, MENG

Assignees

• Contemporary Amperex Technology Co., Limited

Dates

Publication Date

20260506

Application Date

20231204

Claims (20)

1. A battery cell, comprising: a housing, having a first wall, the first wall having a first through hole; an electrode terminal, disposed in the first through hole, wherein along a first direction, the electrode terminal has a first end, the first direction being parallel to a thickness direction of the first wall; and an insulating member, at least partially disposed between the electrode terminal and a wall of the first through hole, wherein the insulating member connects the electrode terminal and the first wall; wherein along the first direction, a projection of the first end does not overlap with a projection of the insulating member.
2. The battery cell according to claim 1, wherein the insulating member is thermally compositely connected to the electrode terminal.
3. The battery cell according to claim 1 or 2, wherein along the first direction, the first end is an end of the electrode terminal facing away from an interior of the housing.
4. The battery cell according to claim 3, wherein along the first direction, the first wall has a first surface facing away from the interior of the housing; and a portion of the insulating member is disposed on the first surface.
5. The battery cell according to claim 4, wherein the battery cell further comprises: a connecting member, wherein the connecting member is located on a side of the first wall facing away from the interior of the housing, and the connecting member is connected to the first end to restrict movement of the electrode terminal along the first direction.
6. The battery cell according to claim 5, wherein along the first direction, the portion of the insulating member disposed on the first surface is located between the connecting member and the first wall.
7. The battery cell according to claim 5, wherein along the first direction, the first end protrudes beyond the first surface, and the connecting member is connected to at least a portion of a peripheral surface of the portion of the first end protruding beyond the first surface; or the connecting member is connected to an end face of the first end.
8. The battery cell according to any one of claims 5 to 7, wherein the connecting member is annular, and the connecting member surrounds the first end.
9. The battery cell according to any one of claims 5 to 8, wherein along the first direction, the electrode terminal is provided with a liquid injection hole, and the liquid injection hole penetrates the electrode terminal and communicates with an interior of the housing.
10. The battery cell according to claim 9, wherein the connecting member seals the liquid injection hole.
11. The battery cell according to claim 10, wherein along the first direction, a projection of the connecting member covers a projection of the first end.
12. The battery cell according to claim 10 or 11, wherein an end face of the first end is provided with a first groove, and the liquid injection hole is located at a bottom of the first groove.
13. The battery cell according to claim 12, wherein along the first direction, a surface of the connecting member facing the electrode terminal is provided with a second groove, the first end is disposed in the second groove, and a portion of the connecting member is located in the first groove.
14. The battery cell according to claim 13, wherein along the first direction, the surface of the connecting member facing away from the electrode terminal is provided with a third groove, and the second groove and the third groove are correspondingly disposed.
15. The battery cell according to any one of claims 9 to 14, wherein a peripheral surface of the connecting member is provided with a flange, and the flange is connected to the portion of the insulating member disposed on the first surface.
16. The battery cell according to any one of claims 5 to 15, wherein the connecting member is welded to the first end.
17. The battery cell according to any one of claims 5 to 16, wherein the connecting member is a metal member.
18. The battery cell according to any one of claims 1 to 17, wherein the electrode terminal has a second end, wherein along the first direction, the second end is disposed opposite to the first end, and the second end is located on a side of the first wall facing away from the first end; and along the first direction, a projection of the second end partially overlaps with a projection of the first wall.
19. The battery cell according to claim 18, wherein a portion of the insulating member is located between the first wall and the second end.
20. A battery, comprising the battery cell according to any one of claims 1 to 19.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application claims priority to Chinese Patent Application No. 2023218980827, filed on July 19, 2023, and entitled "BATTERY CELL, BATTERY, AND ELECTRIC APPARATUS," the entire content of which is incorporated herein by reference. TECHNICAL FIELD The present application relates to the field of battery technology, and more particularly, to a battery cell, a battery, and an electric apparatus. BACKGROUND Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is a critical factor in their development, and improving the reliability of batteries is an urgent technical issue in battery technology that needs to be addressed. SUMMARY The present application provides a battery cell, a battery, and an electric apparatus, where the technical solutions provided by the present application can improve the reliability of the battery. The present application is implemented through the following technical solutions: According to a first aspect, some embodiments of the present application provide a battery cell, where the battery cell includes a housing, an electrode terminal, and an insulating member. The housing has a first wall, where the first wall has a first through hole. The electrode terminal is disposed in the first through hole, and along a first direction, the electrode terminal has a first end, where the first direction is parallel to a thickness direction of the first wall. At least a portion of the insulating member is disposed between the electrode terminal and a wall of the first through hole, and the insulating member connects the electrode terminal and the first wall. Along the first direction, a projection of the first end does not overlap with a projection of the insulating member. In the above solution, the insulating member connects the electrode terminal and the first wall, enabling the electrode terminal to be fixed to the first wall; and the shape of the electrode terminal is defined such that the projection of the first end of the electrode terminal does not overlap with the projection of the insulating member, meaning that the flange currently formed on the first end of the electrode terminal is eliminated, reducing the risk of damage to the insulating member due to interference with the insulating member from the outward bending of the end of the electrode terminal to form a flange. This effectively enhances the insulation performance of the insulating member, reducing the risk of a short circuit in the battery cell, and improving the reliability of the battery. According to some embodiments of the present application, the insulating member is thermally compositely connected to the electrode terminal. In the above solution, the insulating member is connected to the electrode terminal of the battery through a thermal composite bonding process, which can reduce the difficulty of connecting the electrode terminal to the insulating member, improve the manufacturing efficiency of the battery, and ensure that the electrode terminal is stably mounted in the first through hole. According to some embodiments of the present application, along the first direction, the first end is an end of the electrode terminal facing away from the interior of the housing. In the above solution, the first end is the end of the electrode terminal located on the outer side of the housing, meaning that the end of the electrode terminal facing away from the interior of the housing cannot form a flange, thereby reducing the risk of damage to the portion of the insulating member located outside the housing due to interference from the flange, improving the reliability of the battery. According to some embodiments of the present application, along the first direction, the first wall has a first surface facing away from the interior of the housing. A portion of the insulating member is disposed on the first surface. In the above solution, the first surface may be the outer surface of the first wall. By disposing a portion of the insulating member on the first surface, the creepage distance between the electrode terminal and the first wall can be increased, enhancing the insulation effect of the insulating member; and the portion of the insulating member disposed on the first surface can restrict the displacement of the insulating member along the first direction, reducing the risk of displacement of the insulating member and improving the insulation effect. Additionally, the portion of the insulating member being disposed on the first surface may be regarded as the insulating member overlapping the first wall, enabling the electrode terminal to be stably mounted on the first wall. According to some embod