US 12,191,475 B2
Electrode assembly, secondary battery, battery module, battery pack and electrical device
Tao Zhang, Ningde (CN); Jianfu He, Ningde (CN); Qian Liu, Ningde (CN); Xueyang Sun, Ningde (CN); and Yonghuang Ye, 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. 21, 2022, as Appl. No. 17/933,855.
Application 17/933,855 is a continuation of application No. PCT/CN2021/123648, filed on Oct. 13, 2021.
Prior Publication US 2023/0112421 A1, Apr. 13, 2023
Int. Cl. H01M 4/13 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/13 (2013.01) [H01M 2004/021 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electrode assembly, comprising
a positive electrode plate comprising a positive electrode current collector and a first positive electrode film layer and a second positive electrode film layer located on two opposite surfaces of the positive electrode current collector,
a negative electrode plate comprising a negative electrode current collector and a first negative electrode film layer and a second negative electrode film layer located on two opposite surfaces of the negative electrode current collector; and
a separator disposed between the positive electrode plate and the negative electrode plate, wherein the first positive electrode film layer is located on a side of the positive electrode current collector close to the separator and the second negative electrode film layer is located on a side of the negative electrode current collector near the separator, wherein
the positive electrode plate satisfies 0<CAP1/CAP2<1, wherein CAP1 represents capacity of the first positive electrode film layer in Ah, CAP2 represents capacity of the second positive electrode film layer in Ah, and
the negative electrode plate satisfies 0≤R4/R3≥30, the positive electrode plate satisfies 0<R2/R1≤20, the electrode assembly satisfies R4/R3−R2/R1≥0, wherein R1 represents resistance of the first positive electrode film layer in Ω, R2 represents resistance of the second positive electrode film layer in Ω, R3 represents resistance of the first negative electrode film layer in mΩ and R4 represents resistance of the second negative film layer in mΩ,
the second positive electrode film layer comprises a second positive electrode base layer and at least one second positive electrode conductive carbon layer disposed on at least one of two opposite surfaces of the second positive electrode base layer,
the positive electrode plate satisfies R2<R1.