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US-12626975-B2 - End cover assembly, battery cell, battery, and electric apparatus

US12626975B2US 12626975 B2US12626975 B2US 12626975B2US-12626975-B2

Abstract

An end cover assembly for a battery cell includes an end cover provided with a through hole, a sealing member configured to seal the through hole and connected to the end cover to form a joint, and a barrier member provided at the through hole with a channel formed between at least part of the barrier member and a side wall of the through hole. The channel is configured to guide fluid in the battery cell to the joint.

Inventors

  • Wenlong KANG
  • Xiaoping Zhang
  • Chengyou Xing

Assignees

  • JIANGSU CONTEMPORARY AMPEREX TECHNOLOGY LIMITED

Dates

Publication Date
20260512
Application Date
20221124
Priority Date
20201013

Claims (20)

  1. 1 . An end cover assembly for a battery cell, comprising: an end cover, provided with a through hole; a sealing member, configured to seal the through hole, wherein the sealing member is connected to the end cover to form a joint; and a barrier member, provided at the through hole, wherein the barrier member comprises a first part located inside the through hole, a channel is formed between the first part of the barrier member and a side wall of the through hole, and the channel is configured to guide fluid in the battery cell to the joint and is formed by: one of the side wall of the through hole and a surface of the first part that faces the side wall of the through hall, and a notch in another one of the side wall of the through hole and the surface of the first part that faces the side wall of the through hole.
  2. 2 . The end cover assembly according to claim 1 , wherein a cross-sectional area of the channel decreases along an axial direction of the through hole from a side away from the sealing member toward a side closer to the sealing member.
  3. 3 . The end cover assembly according to claim 2 , wherein the cross-sectional area of the channel continuously decreases along the axial direction of the through hole toward the side of the sealing member closer to the through hole.
  4. 4 . The end cover assembly according to claim 2 , wherein the cross-sectional area of the channel decreases segment by segment along the axial direction of the through hole toward the side of the sealing member closer to the through hole.
  5. 5 . The end cover assembly according to claim 1 , wherein the through hole comprises two opposite end openings in an axial direction of the through hole, and the notch always penetrates through the two end openings.
  6. 6 . The end cover assembly according to claim 1 , wherein the barrier member further comprises a second part disposed in succession with respect to the first part and protruding from the end cover.
  7. 7 . The end cover assembly according to claim 6 , wherein: the notch is a first notch; and the second part is provided with a second notch, and the second notch communicates with the first notch.
  8. 8 . The end cover assembly according to claim 7 , wherein: the first notch is one of one or more first notches provided at the first part and the second notch is one of one or more second notches provided at the second part; and a number of the one or more second notches is same as a number of the one or more first notches, and the one or more second notches and the one or more first notches are disposed in a one to one correspondence.
  9. 9 . The end cover assembly according to claim 1 , wherein the through hole is a round hole, the first part is cylindrical to match a shape of the through hole, the notch is provided at the surface of the first part facing the side wall of the through hole to form the channel with the side wall of the through hole, and rest surface of the barrier member is closely attached to the side wall of the through hole.
  10. 10 . The end cover assembly according to claim 6 , wherein each of the first part and the second part is a cylinder, and the second part and the first part are coaxial.
  11. 11 . The end cover assembly according to claim 10 , wherein a radial length of the second part is smaller than a radial length of the first part.
  12. 12 . The end cover assembly according to claim 1 , wherein the notch is one of two or more notches provided at the barrier member, and the two or more notches are spaced apart from each other around a circumference of the through hole.
  13. 13 . The end cover assembly according to claim 12 , wherein the two or more notches include three or more notches, and an equal included angle is present between every adjacent two of the three or more notches.
  14. 14 . The end cover assembly according to claim 1 , wherein a surface where the notch is formed is flat.
  15. 15 . The end cover assembly according to claim 1 , wherein a surface where the notch is formed is curved.
  16. 16 . The end cover assembly according to claim 1 , wherein the end cover is further provided with a depression, the depression is disposed in correspondence to the through hole and communicates with the through hole, and the depression is configured to accommodate the sealing member.
  17. 17 . A battery cell, comprising: a housing, comprising an internal space and an opening that communicates with the internal space; and the end cover assembly according to claim 1 closing the opening.
  18. 18 . A battery, comprising the battery cell according to claim 17 .
  19. 19 . An electric apparatus, comprising the battery cell according to claim 17 configured to supply electrical energy.
  20. 20 . An end cover assembly for a battery cell, comprising: an end cover, provided with a through hole; a sealing member, configured to seal the through hole, wherein the sealing member is connected to the end cover to form a joint; and a barrier member, provided at the through hole with a channel formed between the barrier member and a side wall of the through hole, wherein the channel is configured to guide fluid in the battery cell to the joint; wherein the sealing member is provided with an escape groove on a side facing the barrier member, the escape groove being configured to avoid interference between the sealing member and the barrier member during fitting.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2021/111618, filed on Aug. 9, 2021, which claims priority to Chinese Patent Application No. 202022269855.8, filed on Oct. 13, 2020 and entitled “END COVER ASSEMBLY, BATTERY CELL, BATTERY, AND ELECTRIC APPARATUS”, the entire contents of both of which are incorporated herein by reference. TECHNICAL FIELD This application relates to the field of energy storage technologies, and in particular, to an end cover assembly, a battery cell, a battery, and an electric apparatus. BACKGROUND Rechargeable battery cells have been widely used in electric vehicles due to the advantages of high energy density, high power density, long cycle life, long storage time, and the like. Currently, the sealing of battery cells is constraining the development of battery cells, and therefore technology related to sealing of battery cells has become one of the subjects of research. SUMMARY Embodiments of this application provide an end cover assembly, a battery cell, a battery, and an electric apparatus. The end cover assembly can meet a sealing requirement of the battery cell. According to a first aspect, the embodiments of this application propose an end cover assembly for a battery cell. The end cover assembly includes: an end cover, provided with a through hole; a sealing member, configured to seal the through hole, where the sealing member is connected to the end cover to form a joint; and a barrier member, provided in the through hole with a channel formed between at least part of the barrier member and a side wall of the through hole, where the channel is configured to guide fluid in the battery cell to the joint. This configuration allows the fluid inside the battery cell to flow through the channel to the joint. When a leak occurs at the joint between the sealing member and the end cover, the fluid inside the battery cell can be detected so as to provide feedback on whether a leak has occurred between the sealing member and the end cover, so that remedial measures can be taken for the leaked end cover assembly before it leaves the factory. Such configuration can better ensure proper sealing of the end cover assembly and meet the sealing requirement of the battery cell. According to an aspect of the embodiments of this application, a surface of the barrier member facing the side wall is provided with a first notch, and the channel is formed between the first notch and the side wall. With this configuration, the channel is easy to process and form, the strength loss of the barrier member is small, and the barrier member is not easily deformed, effectively avoiding blocking of the channel due to deformation of the barrier member, and thereby ensuring testing accuracy of the sealing performance of the joint between the sealing member and the end cover. According to an aspect of the embodiments of this application, a cross-sectional area of the channel progressively decreases along an axial direction of the through hole toward a side of the sealing member closer to the through hole. With this configuration, a lower opening of the channel can be enlarged as much as possible to help the fluid flow to the joint, and ensure stable cooperation between the barrier member and the through hole. According to an aspect of the embodiments of this application, the through hole includes two opposite ports in an axial direction of the through hole, and the first notch always penetrates through the two ports. With the foregoing configuration, the channel can be kept open, ensuring that the fluid can flow through the channel to the joint between the sealing member and the end cover. According to an aspect of the embodiments of this application, the barrier member includes a first part and a second part that are disposed in succession, the first part is located inside the through hole, the first notch is provided at the first part, and the second part protrudes from the end cover. By adopting this structural form, the barrier member, while meeting a requirement of forming a channel with the sidewall of the through hole, can also have a simple structure, making it easy to form and easy to remove from or install into the through hole. According to an aspect of the embodiments of this application, the second part is provided with a second notch, and the second notch communicates with the first notch. In one aspect, the provision of the second notch enables the barrier member to be positioned in a predetermined direction in a carrying box (that is, before the barrier member fits into the through hole of the end cover), helping a robotic hand grip the barrier member and install it into the through hole. In another aspect, the provision of the second notch makes it easy for the fluid flow to the channel. In still another aspect, the provision of the second notch also causes a radial length of the second part to be smaller than a radial length