Lithium-ion battery, battery module, battery pack, and electrical device

Patent metadata

Field	Value
Publication number	US-12424618-B2
Application number	US-202217953327-A
Country	US
Kind code	B2
Filing date	Sep 27, 2022
Priority date	Aug 31, 2021
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

This application provides a lithium-ion battery, including: an electrode assembly and an electrolytic solution.The lithium-ion battery may satisfy the following condition:0.6≤α≤0.9, and 4≤w×α/β1≤25,where, 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 LixR1(SO2N)xSO2R2 by mass in the electrolytic solution; and β1 is a thickness of the metallic conductive layer in the positive current collector, measured in μM.

First claim

What is claimed is:

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 .

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Peng Chang
• Chen Peipei
• Zou Hailin
• Li Liye

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/626

  Metals · CPC title

• H01M10/0567

  characterised by the additives · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title