US 12,412,892 B2
Secondary battery and electric apparatus
Chen Zeng, Ningde (CN); Meng Kang, Ningde (CN); Liangbin Liu, Ningde (CN); Libing He, Ningde (CN); and Jiazheng Wang, 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 Jan. 27, 2025, as Appl. No. 19/038,200.
Application 19/038,200 is a continuation of application No. PCT/CN2023/075710, filed on Feb. 13, 2023.
Prior Publication US 2025/0174641 A1, May 29, 2025
Int. Cl. H01M 4/36 (2006.01); H01M 4/48 (2010.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01); B60L 50/64 (2019.01); H01M 4/02 (2006.01)
CPC H01M 4/366 (2013.01) [H01M 4/48 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); B60L 50/64 (2019.02); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 2220/20 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A secondary battery, comprising:
a negative electrode plate, comprising:
a negative electrode current collector; and
a negative electrode film layer, wherein
the negative electrode film layer has a first surface away from the negative electrode current collector and a second surface arranged opposite the first surface;
the negative electrode film layer has a thickness of H;
a first region of the negative electrode film layer comprises a first active material with a thickness range from the second surface of the negative electrode film layer to 0.3H, wherein the first active material comprises a first silicon-based material and a first carbon-based material, the first silicon-based material comprises secondary particles formed by aggregation of primary particles, the first carbon-based material comprises secondary particles formed by aggregation of the primary particles; and
a second region of the negative electrode film layer comprises a second active material with a thickness range from the first surface of the negative electrode film layer to 0.3H, the second active material comprises a second carbon-based material, the second carbon-based material comprises secondary particles formed by aggregation of primary particles, a proportion of the second carbon-based material being the secondary particles in the second carbon-based material by quantity is less than a proportion of the first carbon-based material being the secondary particles in the first carbon-based material by quantity.