Granted Patent B2

US 12,712,174 · App. 18/346,794 · Granted Aug 18, 2026

Inventors: Xiao Chen (Ningde City, CN); Guangjun Wang (Ningde City, CN); Yonghuang Ye (Ningde City, CN)

Assignee: CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

H01M4/0404H01M4/661H01M2004/021

Abstract

Claims (20)

1 . A secondary battery, comprising a positive electrode sheet, a negative electrode sheet, and a separator placed between the positive electrode sheet and the negative electrode sheet,

the positive electrode sheet comprising a positive electrode current collector and positive film layers A1 and B1 respectively provided on two surfaces of the positive electrode current collector, and the negative electrode sheet comprising a negative electrode current collector and negative film layers respectively provided on two surfaces of the negative electrode current collector,

wherein each of the positive electrode film layers comprises a positive electrode active material selected from a lithium-containing phosphate of an olivine structure and a lithium transition metal oxide,

wherein each of the negative electrode film layers comprises a negative electrode active material comprising artificial graphite,

wherein capacities per unit area Cap A1 and Cap B1 of the positive film layers A1 and B1 satisfy 0.7<Cap A1/Cap B1<0.9,

wherein a negative film layer provided opposite to and separated from the positive film layer A1 by a separator is A2, and capacities per unit area Cap A2 and Cap A1 of the negative film layer A2 and the positive film layer A1 satisfy 1.02<Cap A2/Cap A1≤1.2,

and the negative electrode current collector of the negative electrode sheet is provided with at least one through hole.

2 . The secondary battery according to claim 1 , wherein a negative film layer provided opposite to and separated from the positive film layer B1 by a separator is B2, and capacities per unit area Cap B2 and Cap B1 of the negative film layer B2 and the positive film layer B1 satisfy max (Cap A1/Cap B1, (Cap B1+Cap A1-Cap A2)/Cap B1)≤Cap B2/Cap B1≤1.

3 . The secondary battery according to claim 1 , wherein a ratio of an area of the through hole to an area of the negative electrode current collector is 0.2%-40%.

4 . The secondary battery according to claim 1 , wherein a pore diameter of the through hole is 5-500 μm.

5 . The secondary battery according to claim 1 , wherein compacted density of the positive electrode sheet is 2.0-3.6 g/cc.

6 . The secondary battery according to claim 1 , wherein compacted density of the negative electrode sheet is 0.5-2 g/cc.

7 . The secondary battery according to claim 1 , wherein a pore diameter of the through hole is 200-500 μm.

8 . The secondary battery according to claim 1 , wherein a thickness of the positive film layer A1 is 51 μm to 87 μm, a thickness of the negative film layer A2 is 55 μm to 70 μm.

9 . The secondary battery according to claim 1 , wherein a thickness of the positive film layer B1 is 64 μm to 144 μm, a thickness of the negative film layer B2 is 57 μm to 77 μm.

10 . A battery module, wherein the battery module comprises the secondary battery according to claim 1 .

11 . A battery pack, wherein the battery pack comprises the battery module according to claim 10 .

12 . A power consumption apparatus, wherein the power consumption apparatus comprises the secondary battery according to claim 1 .

13 . A power consumption apparatus, wherein the power consumption apparatus comprises the battery module according to claim 10 .

14 . A power consumption apparatus, wherein the power consumption apparatus comprises the battery pack according to claim 11 .

Assignments (2)

Continuity (2)

References Cited (21)