US 12,424,618 B2
Lithium-ion battery, battery module, battery pack, and electrical device
Chang Peng, Ningde (CN); Peipei Chen, Ningde (CN); Hailin Zou, Ningde (CN); and Liye Li, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Sep. 27, 2022, as Appl. No. 17/953,327.
Application 17/953,327 is a continuation of application No. PCT/CN2021/115815, filed on Aug. 31, 2021.
Prior Publication US 2023/0084934 A1, Mar. 16, 2023
Int. Cl. H01M 4/36 (2006.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 10/0567 (2010.01)
CPC H01M 4/366 (2013.01) [H01M 4/626 (2013.01); H01M 10/0525 (2013.01); H01M 10/0567 (2013.01)] 12 Claims
OG exemplary drawing
 
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 LixR1(SO2N)xSO2R2, wherein R1 and R2 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/β1≤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 LixR1(SO2N)xSO2R2 by mass in the electrolytic solution; and β1 is a thickness of the metallic conductive layer, measured in μm.