Granted Patent B2

US 12,424,618 · App. 17/953,327 · Granted Sep 23, 2025

Inventors: Chang Peng (Ningde, CN); Peipei Chen (Ningde, CN); Hailin Zou (Ningde, CN); Liye Li (Ningde, CN)

Assignee: CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

H01M4/366H01M4/626H01M10/0525H01M10/0567

Abstract

Claims (31)

1. A lithium-ion battery,

comprising: an electrode assembly and an electrolytic solution, wherein

the electrode assembly comprises a positive electrode plate and a negative electrode plate that are wound together, and a separator located between the positive electrode plate and the negative electrode plate, the negative electrode plate comprises a negative current collector and a negative material layer disposed on at least one surface of the negative current collector, and the positive electrode plate comprises a positive current collector and a positive material layer disposed on at least one surface of the positive current collector;

the positive current collector comprises a support layer and a metallic conductive layer, and the metallic conductive layer is disposed on at least one of two surfaces of the support layer;

the electrolytic solution contains a first lithium salt Li x R 1 (SO 2 N) x SO 2 R 2 , wherein R 1 and R 2 each independently represent an alkyl with 1 to 20 fluorine atoms or carbon atoms, or a fluoroalkyl with 1 to 20 carbon atoms, or a fluoroalkoxyl with 1 to 20 carbon atoms, and x is an integer of 1, 2, or 3;

the lithium-ion battery satisfies the following condition:

0.6≤α≤0.9, and 4≤ w×α/β 1≤25,

wherein, α=La/Lc, La is an arc length of a convex surface of the negative current collector corresponding to a concave surface of an innermost first circle of positive electrode in a jelly-roll structure of the electrode assembly, Lc is an arc length of a concave surface of an innermost first circle of positive current collector in the jelly-roll structure of the electrode assembly, and La and Lc are measured in mm; w is a percent of the first lithium salt Li x R 1 (SO 2 N) x SO 2 R 2 by mass in the electrolytic solution; and β1 is a thickness of the metallic conductive layer, measured in μm.

2. The lithium-ion battery according to claim 1 , wherein

the lithium-ion battery satisfies the following condition:

8.7≤ w×α/β 1≤17.

3. The lithium-ion battery according to claim 1 , wherein

0.52≤β1≤2.4.

4. The lithium-ion battery according to claim 1 , wherein

5≤ w≤ 30.

5. The lithium-ion battery according to claim 1 , wherein

the metallic conductive layer is disposed on both surfaces of the support layer.

6. The lithium-ion battery according to claim 1 , wherein

the electrolytic solution further contains a second lithium salt, and the second lithium salt is at least one selected from LiPF 6 , LiAsF 6 , or LiBF 4 .

7. The lithium-ion battery according to claim 6 , wherein

based on a total mass of the electrolytic solution, a mass percent of the second lithium salt is less than or equal to 10%.

8. The lithium-ion battery according to claim 1 , wherein

the electrolytic solution further contains an additive, and the additive is at least one selected from fluorosulfonate, difluorooxalate borate, difluorophosphate, difluorobisoxalate, tris(trimethylsilyl)phosphate, or tris(trimethylsilyl)phosphite.

9. The lithium-ion battery according to claim 8 , wherein

based on a total mass of the electrolytic solution, a mass percent of the additive is less than or equal to 3%.

10. A battery module,

comprising the lithium-ion battery according to claim 1 .

11. A battery pack,

comprising at least one of the lithium-ion battery according to the battery module according to claim 10 .

12. An electrical device,

comprising the battery pack according to claim 11 .

Assignments (2)

Continuity (2)

References Cited (15)