US-12627015-B2 - Battery cell having a protective member, battery, and power consuming device

Abstract

A battery cell, a battery, and a power consuming device are described. The battery cell includes a housing, an electrode terminal, and a protective member. The housing includes a first end wall, the electrode terminal is disposed on the first end wall, the protective member covers an outer surface of the first end wall, a first through hole is provided on the protective member, and the first through hole is configured to expose the electrode terminal. A cavity configured to store liquid is formed between the protective member and the first end wall. The battery cell has relatively high reliability.

Inventors

• Wenlin ZHOU
• Liangfan Xu
• Quankun Li
• Xing Li
• Peng Wang
• Peng Wang
• Haizu Jin

Assignees

• CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

Dates

Publication Date

20260512

Application Date

20250603

Priority Date

20230317

Claims (20)

1. 1 . A battery cell, comprising: a housing, comprising a first end wall; and at least one electrode terminal, disposed on the first end wall; the housing further comprising at least one of: a side wall disposed around the first end wall, a joint being formed between the side wall and the first end wall around the first end wall; a pressure relief mechanism disposed on the first end wall; and a sealed liquid injection hole disposed on the first end wall; and a protective member, covering an outer surface of the first end wall such that said at least one of: the joint around the first end wall; the pressure relief mechanism; and the sealed liquid injection hole; is completely covered by the protective member, wherein at least one first through hole is provided on the protective member, and the at least one first through hole is configured to expose the at least one electrode terminal, wherein a cavity configured to store liquid is formed between the protective member and the first end wall.
2. 2 . The battery cell according to claim 1 , wherein the cavity is provided around the at least one electrode terminal.
3. 3 . The battery cell according to claim 1 , wherein the battery cell further comprises at least one insulating member, and the at least one insulating member is disposed between the at least one electrode terminal and the first end wall; and a part of the protective member that surrounds the at least one first through hole and the first end wall or the insulating member are connected to form at least one first connection portion, the at least one first connection portion is disposed around the at least one electrode terminal, and the cavity is separated from the at least one first connection portion.
4. 4 . The battery cell according to claim 1 , wherein at least one protrusion is formed on the outer surface of the first end wall, the protective member covers the at least one protrusion, and the cavity comprises a first sub-cavity located on a peripheral side of the at least one protrusion.
5. 5 . The battery cell according to claim 4 , wherein the at least one protrusion is disposed around the at least one electrode terminal, the at least one protrusion has a first end surface facing away from inside of the housing, an inner peripheral surface facing the at least one electrode terminal, and an outer peripheral surface facing away from the at least one electrode terminal, and the protective member is attached to the first end surface; and the protective member is not attached to the inner peripheral surface, to form the first sub-cavity between the protective member and the inner peripheral surface; and/or the protective member is not attached to the outer peripheral surface, to form the first sub-cavity between the protective member and the outer peripheral surface.
6. 6 . The battery cell according to claim 5 , wherein the first sub-cavity is provided around the at least one electrode terminal, and a cross section of the first sub-cavity is in a shape of a triangle.
7. 7 . The battery cell according to claim 4 , wherein the at least one electrode terminal has a second end surface facing away from inside of the housing, and the at least one protrusion does not extend out of the second end surface along a thickness direction of the first end wall.
8. 8 . The battery cell according to claim 1 , wherein the first end wall comprises a body and a protruding portion, the body is disposed around the protruding portion, the body comprises a first surface facing away from inside of the housing, the protruding portion protrudes from the first surface, the at least one electrode terminal is disposed on the protruding portion, and the cavity comprises a second sub-cavity located at a joint between the protruding portion and the body.
9. 9 . The battery cell according to claim 8 , wherein the second sub-cavity is provided around the protruding portion.
10. 10 . The battery cell according to claim 8 , wherein the protruding portion comprises a first wall portion and a second wall portion, the first wall portion is disposed parallel to the body, the second wall portion is disposed around the first wall portion, the second wall portion connects the first wall portion and the body, the at least one electrode terminal is disposed on the first wall portion, and the second sub-cavity is located at a joint between the second wall portion and the body.
11. 11 . The battery cell according to claim 1 , wherein a first groove is provided on the outer surface of the first end wall, the at least one electrode terminal is disposed on a groove bottom wall of the first groove, the part of the protective member that surrounds the first through hole is connected to the groove bottom wall of the first groove, and the cavity comprises a third sub-cavity located at a joint between the groove bottom wall of the first groove and a groove side wall of the first groove.
12. 12 . The battery cell according to claim 11 , wherein the third sub-cavity is provided around the at least one electrode terminal, and a cross section of the third sub-cavity is in a shape of a triangle.
13. 13 . The battery cell according to claim 1 , wherein a second groove is provided on the outer surface of the first end wall, the protective member covers the second groove, and the cavity comprises a fourth sub-cavity enclosed by the second groove and the protective member.
14. 14 . The battery cell according to claim 1 , wherein the housing further comprises a side wall, the side wall is disposed around the first end wall, and the protective member covers at least a part of an outer surface of the side wall.
15. 15 . The battery cell according to claim 14 , wherein the first end wall and the side wall are connected to form a second connection portion, and the protective member covers the second connection portion.
16. 16 . The battery cell according to claim 15 , wherein the housing further comprises a second end wall, the second end wall is disposed opposite to the first end wall, the side wall connects the first end wall and the second end wall, and the protective member covers at least a part of an outer surface of the second end wall.
17. 17 . The battery cell according to claim 16 , wherein a part of the outer surface of the second end wall is not covered by the protective member.
18. 18 . A battery, comprising the battery cell according to claim 1 .
19. 19 . A power consuming device, comprising the battery cell according to claim 1 .
20. 20 . A battery cell, comprising: a housing, comprising a first end wall; an electrode terminal, disposed on the first end wall; and a protective member, covering an outer surface of the first end wall, wherein a first through hole is provided on the protective member, and the first through hole is configured to expose the electrode terminal, wherein a cavity configured to store liquid is formed between the protective member and the first end wall; wherein the protective member is an insulating film; and wherein the first end wall is not flat and comprises first surfaces relatively recessed with respect to second surfaces, wherein the film protective member contacts the second surfaces and not the first surfaces; said cavity being formed between the film protective member and the first surfaces.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International application PCT/CN2023/127508 filed on Oct. 20, 2023 that claims priority to Chinese Patent Application No. CN202310265348.2, filed on Mar. 17, 2023. The content of these applications is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of battery technologies, and specifically, to a battery cell, a battery, and a power consuming device. BACKGROUND Energy conservation and emission reduction are keys to the sustainable development of the automobile industry. Electric vehicles become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For the electric vehicles, a battery technology is also an important factor related to the development of the electric vehicles. During manufacturing of a battery, the reliability of the battery is an issue that cannot be ignored. Therefore, how to improve the reliability of the battery is a technical problem that needs to be urgently resolved in the battery technology. SUMMARY This application provides a battery cell, a battery, and a power consuming device. The battery cell has relatively high reliability. This application is implemented through the following technical solutions. According to a first aspect, an embodiment of this application provides a battery cell. The battery cell includes a housing, an electrode terminal, and a protective member. The housing includes a first end wall, the electrode terminal is disposed on the first end wall, the protective member covers an outer surface of the first end wall, a first through hole is provided on the protective member, and the first through hole is configured to expose the electrode terminal. A cavity configured to store liquid is formed between the protective member and the first end wall. According to the battery cell in the embodiments of this application, the protective member is disposed on the outer surface of the first end wall, and the cavity configured to store the liquid is formed between the protective member and the first end wall, so that a space for storing the liquid between the protective member and the first end wall can be increased. The protective member can cooperate with the first end wall to constrain the liquid leaking from the first end wall. When the liquid leaks from the first end wall, more liquid can be stored between the protective member and the first end wall, to slow down liquid dropping and reduce a risk of a short circuit caused by contact between a positive electrode and a negative electrode that is caused by liquid splashing. In this way, the battery cell has relatively high reliability. According to some embodiments of this application, the cavity is provided around the electrode terminal. In the foregoing solution, the cavity is provided around the electrode terminal, so that the liquid can be stored on a periphery of the electrode terminal, which has a relatively good constraining effect on the liquid, and can slow down flow of the liquid toward the electrode terminal. According to some embodiments of this application, the battery cell further includes an insulating member, and the insulating member is disposed between the electrode terminal and the first end wall; and a part of the protective member that surrounds the first through hole and the first end wall or the insulating member are connected to form a first connection portion, the first connection portion is disposed around the electrode terminal, and the cavity is separated from the first connection portion. In the foregoing solution, the part of the protective member that surrounds the first through hole is connected to the first end wall or the insulating member, and the cavity is separated from the first connection portion, so that the flow of the liquid toward the first connection portion can be slowed down, and failure of the first connection portion can be slowed down. According to some embodiments of this application, a protrusion is formed on the outer surface of the first end wall, the protective member covers the protrusion, and the cavity includes a first sub-cavity located on a peripheral side of the protrusion. In the foregoing embodiment, the protective member covers the protrusion, and the first sub-cavity can be formed on the peripheral side of the protrusion by using a structure of the protrusion, to store more liquid. According to some embodiments of this application, the protrusion is disposed around the electrode terminal, the protrusion has a first end surface facing away from inside of the housing, an inner peripheral surface facing the electrode terminal, and an outer peripheral surface facing away from the electrode terminal, and the protective member is attached to the first end surface; and the protective member is not attached to the inner peripheral surface, t