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EP-4738560-A1 - CELL ASSEMBLY, BATTERY MODULE AND BATTERY PACK

EP4738560A1EP 4738560 A1EP4738560 A1EP 4738560A1EP-4738560-A1

Abstract

A cell assembly, a battery module, and a battery pack are provided. The cell assembly includes a cell (100) including a cell body (110), where a first end surface (111) of the cell body (110) is arranged with an electrode post (120) protruding outward, and an insulating ring (130) is arranged between the first end surface (111) and the electrode post (120); and a sealed insulating unit (200) including a sealed insulating cover (210) sealingly connected between the first end surface (111) and the electrode post (120) and covering the insulating ring (130).

Inventors

  • WU, CHANGJUN
  • YANG, XINWEI
  • CUI, Xin
  • YUAN, Zhuchen

Assignees

  • AESC Japan Ltd.

Dates

Publication Date
20260506
Application Date
20250922

Claims (15)

  1. A cell assembly, comprising: a cell (100) comprising a cell body (110), wherein a first end surface (111) of the cell body (110) is arranged with an electrode post (120) protruding outward, and an insulating ring (130) is arranged between the first end surface (111) and the electrode post (120); and a sealed insulating unit (200) comprising a sealed insulating cover (210) sealingly connected between the first end surface (111) and the electrode post (120) and covering the insulating ring (130).
  2. The cell assembly according to claim 1, wherein the insulating ring (130) is annular surrounding the electrode post (120) and is embedded in the first end surface (111), and in a radial direction (X) of the insulating ring (130), the sealed insulating cover (210) is sealingly connected to the cell (110) at an inner side and an outer side of the insulating ring (130), so that the sealed insulating cover (210) and the cell (110) form a sealed space (300) covering the insulating ring (130) together.
  3. The cell assembly according to claim 2, wherein the sealed insulating cover (210) is sealingly connected to the first end surface (111) of the cell body (110) to form a continuous and annular outer sealing region (400) at the outer side of the insulating ring (130), and the sealed insulating cover (210) is sealingly connected to the electrode post (120) to form a continuous and annular inner sealing region (500) at the inner side of the insulating ring (130).
  4. The cell assembly according to claim 3, wherein an end portion of the electrode post (120) protruding from the first end surface (111) is defined as a top end of the electrode post (120), and the sealed insulating cover (210) is sealingly connected to the top end of the electrode post (120) to form the inner sealing region (500).
  5. The cell assembly according to claim 4, wherein the sealed insulating cover (210) is arranged with an avoidance through hole (211) near the top end of the electrode post (120), and the top end of the electrode post (120) is exposed through the avoidance through hole (211).
  6. The cell assembly according to claim 3, wherein an end portion of the sealed insulating cover (210) near the first end surface (111) is defined as a bottom end of the sealed insulating cover (210), the sealed insulating cover (210) is arranged with a sealing flange (212) along an outer edge circumference of the bottom end, and both the sealing flange (212) and the bottom end of the sealed insulating cover (210) are sealingly connected to the first end surface (111) to form the outer sealing region (400).
  7. The cell assembly according to claim 1, wherein the sealed insulating cover (210) is a high-temperature resistant structure.
  8. The cell assembly according to claim 1, wherein the sealed insulating cover (210) is sealingly connected to the cell (100) through a high-temperature resistant connection layer.
  9. The cell assembly according to claim 1, comprising at least two cells (100), wherein the sealed insulating unit (200) comprises at least two sealed insulating covers (210) and further comprises a connecting beam (220) connected to the at least two sealed insulating covers (210), the at least two sealed insulating covers (210) and the at least two cells (100) are arranged in one-to-one configuration.
  10. The cell assembly according to claim 9, wherein the connecting beam (220) is connected to the first end surface (111) of the cell body (110).
  11. The cell assembly according to claim 9, further comprising a current-collecting busbar (700), wherein the electrode post (120) is electrically connected to the current-collecting busbar (700), an insulating layer (600) is connected to a side of the current-collecting busbar (700) facing the cell body (110), and the sealed insulating cover (210) is connected to the insulating layer (600).
  12. The cell assembly according to claim 11, wherein the insulating layer (600) and the sealed insulating cover (210) are configured as an integrally-formed structure.
  13. The cell assembly according to claim 1, wherein the cell (100) comprises a cylindrical cell.
  14. A battery module, comprising the cell assembly according to any one of claims 1-13.
  15. A battery pack, comprising the cell assembly according to any one of claims 1-13.

Description

BACKGROUND Technical Field The disclosure relates to the field of power battery technology, and particularly, relates to a cell assembly, a battery module, and a battery pack. Description of Related Art Typically, a cell (including a cylindrical cell and a prismatic cell) includes a housing for forming a cell body and an electrode post protruding from the housing. The housing may serve as a negative electrode of the cell, and the electrode post may serve as a positive electrode of the cell. In order to prevent short circuit between the positive electrode and the negative electrode of the cell, an insulating ring surrounding the electrode post is arranged between the electrode post and the housing. When the cell undergoes thermal runaway, high-temperature gas inside the cell may be discharged outward from the position where the insulating ring is arranged, and safety hazards may thus occur. SUMMARY In view of the above, the disclosure aims to provide a cell assembly, a battery module, and a battery pack capable of at least partially solving the problem of safety hazards in the battery pack caused by high-temperature gas discharged near an electrode post of a cell. Based on the above purpose, a first aspect of the disclosure provides a cell assembly including a cell and a sealed insulating unit. The cell includes a cell body. A first end surface of the cell body is arranged with an electrode post protruding outward, and an insulating ring is arranged between the first end surface and the electrode post. The sealed insulating unit includes a sealed insulating cover sealingly connected between the first end surface and the electrode post and covering the insulating ring. Optionally, the insulating ring is annular surrounding the electrode post and is embedded in the first end surface. In a radial direction of the insulating ring, the sealed insulating cover is sealingly connected to the cell at an inner side and an outer side of the insulating ring, so that the sealed insulating cover and the cell form a sealed space covering the insulating ring together. Optionally, the sealed insulating cover is sealingly connected to the first end surface of the cell body to form a continuous and annular outer sealing region at the outer side of the insulating ring. The sealed insulating cover is sealingly connected to the electrode post to form a continuous and annular inner sealing region at the inner side of the insulating ring. Optionally, an end portion of the electrode post protruding from the first end surface is defined as a top end of the electrode post. The sealed insulating cover is sealingly connected to the top end of the electrode post to form the inner sealing region. Optionally, the sealed insulating cover is arranged with an avoidance through hole near the top end of the electrode post, and the top end of the electrode post is exposed through the avoidance through hole. Optionally, an end portion of the sealed insulating cover near the first end surface is defined as a bottom end of the sealed insulating cover. The sealed insulating cover is arranged with a sealing flange along an outer edge circumference of the bottom end. Both the sealing flange and the bottom end of the sealed insulating cover are sealingly connected to the first end surface to form the outer sealing region. Optionally, the sealed insulating cover is a high-temperature resistant structure. Optionally, the sealed insulating cover is sealingly connected to the cell through a high-temperature resistant connection layer. Optionally, the cell assembly includes at least two cells, and the sealed insulating unit includes at least two sealed insulating covers and further includes a connecting beam connected to at least two sealed insulating covers. The at least two sealed insulating covers and the at least two cells are arranged in one-to-one configuration. Optionally, the connecting beam is connected to the first end surface of the cell body. Optionally, the cell assembly further includes a current-collecting busbar. The electrode post is electrically connected to the current-collecting busbar. An insulating layer is connected to a side of the current-collecting busbar facing the cell body, and the sealed insulating cover is connected to the insulating layer. Optionally, the insulating layer and the sealed insulating cover are configured as an integrally-formed structure. Optionally, the cell includes a cylindrical cell. Based on the same inventive concept, in the second aspect, the disclosure further provides a battery module including the cell assembly as described in the first aspect. Based on the same inventive concept, in the third aspect, the disclosure further provides a battery pack including the cell assembly as described in the first aspect. Based on the above, it can be seen that in the cell assembly, the battery module, and the battery pack provided by the disclosure, by sealingly connecting the sealed insulating cover onto the cell,