Separator, battery cell, battery and electrical apparatus

Patent metadata

Field	Value
Publication number	US-2025372821-A1
Application number	US-202519298218-A
Country	US
Kind code	A1
Filing date	Aug 13, 2025
Priority date	Apr 17, 2023
Publication date	Dec 4, 2025
Grant date	—

Abstract

The present application provides a separator, a battery cell, a battery and an electrical apparatus. The separator includes a separator body and a polymer layer arranged on at least one surface of the separator body. The polymer layer includes an ether polymer. The ether polymer is made into a sheet-like structural body; the sheet-like structural body is subjected to a dynamic frequency scanning test at (Tm+20)° C. to obtain an elastic modulus G′-loss modulus G″ curve, and the elastic modulus G′-loss modulus G″ curve has a slope of K, where 1<K<∞, and Tm° C. represents the melting temperature of the ether polymer.

First claim

What is claimed is:

1 . A separator, comprising:
a separator body; and a polymer layer arranged on at least one surface of the separator body, the polymer layer comprising an ether polymer, wherein the ether polymer is made into a sheet-like structural body; the sheet-like structural body is subjected to a dynamic frequency scanning test at (Tm+20)° C. to obtain an elastic modulus G′-loss modulus G″ curve, and the elastic modulus G′-loss modulus G″ curve has a slope of K, where 1<K<∞, and Tm° C. represents the melting temperature of the ether polymer.

2 . The separator according to claim 1 , wherein 1<K≤100; and optionally, 1<K≤10.

3 . The separator according to claim 1 , wherein
the ether polymer has a glass transition temperature of Tg in the unit of ° C., where −100≤Tg≤50; and optionally, −80≤Tg≤30.

4 . The separator according to claim 1 , wherein the ether polymer comprises a building block represented by Formula (I),

in Formula (I),
R 1 and R 2 each independently include a hydrogen atom, a substituted or unsubstituted C1-C3 alkyl group or a substituted or unsubstituted C1-C3 alkoxy group; and R 3 includes a substituted or unsubstituted C1-C5 methylene group;
optionally, R 1 and R 2 each independently include a hydrogen atom, a substituted or unsubstituted C1-C2 alkyl group; and/or
R 3 includes a single bond and a substituted or unsubstituted C1-C4 methylene group.

5 . The separator according to claim 4 , wherein the ether polymer comprises at least one of a building block represented by Formula (I-1) to a building block represented by Formula (I-8),

6 . The separator according to claim 1 , wherein the ether polymer comprises a building block represented by Formula (II),

in Formula (II),
R 4 to R 7 each independently include a hydrogen atom, a substituted or unsubstituted C1-C3 alkyl group, a substituted or unsubstituted C1-C3 alkoxy group or ether group, and at least one of R 4 to R 7 includes a substituted or unsubstituted C1-C3 alkoxy group or ether group;
and optionally, R 4 to R 7 each independently include a hydrogen atom, a substituted or unsubstituted C1-C2 alkyl group, a substituted or unsubstituted C1-C2 alkoxy group or ether group, and at least one of R 4 to R 7 includes a substituted or unsubstituted C1-C2 alkoxy group or ether group. cm 7 . The separator according to claim 6 , wherein the ether polymer comprises at least one of a building block represented by Formula (II-1) to a building block represented by Formula (II-7),

8 . The separator according to claim 4 , wherein
n is selected from positive integers of 1500 to 25000; and/or the ether polymer has a molecular weight ranging from 1.2×10 5 g/mol to 1.0×106 g/mol.

9 . The separator according to claim 1 , wherein
the ether polymer is added to a first solvent at 70° C. to form an ether polymer system; the ether polymer system is subjected to standing at 70° C. for 8 h, and after standing at 25° C. for the time of ≥24 h, the ether polymer system is filtered via a 200-mesh filter screen, with a first substance remained, wherein the ether polymer has a mass of q in the unit of g; the first substance has a mass of m in the unit of g; and the ether polymer and the first substance satisfy: 5≤m/q≤1000.

10 . The separator according to claim 1 , wherein the separator body comprises a substrate, and the polymer layer is arranged on at least one surface of the substrate.

11 . The separator according to claim 1 , wherein the separator body comprises a substrate and a heat-resistant coating, the heat-resistant coating is arranged on at least one surface of the substrate, and the polymer layer is arranged on a surface of the heat-resistant coating facing away from the substrate.

12 . The separator according to claim 1 , wherein the polymer layer further comprises heat-resistant particles;
optionally, based on the total mass of the polymer layer, a ratio of the percentage mass content of the ether polymer to the percentage mass content of the heat-resistant particles is (0.2 to 5):1.

13 . The separator according to claim 1 , wherein
a coating weight of the polymer layer ranges from 0.5 mg/1540.25 mm 2 to 5 mg/1540.25 mm 2 .

14 . A battery cell, comprising the separator according to claim 1 .

15 . A battery, comprising the battery cell according to claim 1 .

16 . An electrical apparatus, comprising the battery according to claim 15 .

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Li Baiqing
• Peng Shuangjuan
• Peng Lin
• Jin Haizu
• Zhao Fenggang

Classifications

• H01M50/443

  Particulate material · CPC title

• H01M50/446

  Composite material consisting of a mixture of organic and inorganic materials · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/491

  Porosity · CPC title

• H01M50/403 Primary

  Manufacturing processes of separators, membranes or diaphragms · CPC title