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Title:
SEPARATOR AND BATTERY CELL
Document Type and Number:
WIPO Patent Application WO/2024/093494
Kind Code:
A1
Abstract:
A separator and a battery cell. The separator is used for being wound together with an electrode sheet to form the battery cell. The separator comprises: a first section, a second section, and a third section that are sequentially arranged in the length direction of the separator, wherein the width of the first section is smaller than that of the second section, and/or the width of the third section is smaller than that of the second section. The separator is divided into regions having different widths, so that the width of a region located at the head and/or the tail of the separator is smaller than that of the middle position of the separator. The width of the head of the separator is narrowed, so that the contact area between the separator and a winding shaft can be reduced, thereby reducing a friction force between the surface of the separator and the winding shaft, and solving the problem that the separator is pulled out of the battery cell. The width of the tail of the separator is narrowed, so that the swing amplitude of the tail of the separator during winding ending can be reduced, and the problem of separator folding during wound cell ending is solved. The quality of a battery can be improved by improving the problem that the separator is pulled out of the battery cell and/or the separator is folded during wound cell ending.

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Inventors:
SHENG DONGHUI (CN)
LIU PEILUN (CN)
LIU CHUNYU (CN)
XIE JICHUN (CN)
Application Number:
PCT/CN2023/116186
Publication Date:
May 10, 2024
Filing Date:
August 31, 2023
Export Citation:
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Assignee:
ZHUHAI COSMX BATTERY CO LTD (CN)
International Classes:
H01M50/40; H01M50/463
Attorney, Agent or Firm:
BEIJING BRIGHT IP AGENCY CO., LTD. (Unit 3 Floor 12, Building 3, Yard 42, Qibei Roa, Changping District Beijing 0, CN)
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