US 12,315,918 B2
Secondary battery, process for preparing the same and apparatus containing the secondary battery
Meng Kang, Ningde (CN); Jiazheng Wang, Ningde (CN); Xiaobin Dong, Ningde (CN); and Libing He, 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 Mar. 31, 2023, as Appl. No. 18/129,083.
Application 18/129,083 is a continuation of application No. 17/566,691, filed on Dec. 31, 2021, granted, now 11,646,416.
Application 17/566,691 is a continuation of application No. PCT/CN2020/088458, filed on Apr. 30, 2020.
Prior Publication US 2023/0253562 A1, Aug. 10, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H01M 4/36 (2006.01); H01M 4/04 (2006.01); H01M 4/133 (2010.01); H01M 4/1393 (2010.01); H01M 4/583 (2010.01); H01M 4/587 (2010.01); H01M 4/02 (2006.01); H01M 4/64 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 4/366 (2013.01) [H01M 4/04 (2013.01); H01M 4/133 (2013.01); H01M 4/1393 (2013.01); H01M 4/583 (2013.01); H01M 4/587 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01); H01M 4/64 (2013.01); H01M 10/0525 (2013.01)] 19 Claims
 
1. A secondary battery, comprising a negative electrode plate, the negative electrode plate comprising a negative electrode current collector and a negative electrode film, and the negative electrode film comprising a first negative electrode film and a second negative electrode film,
wherein the first negative electrode film is disposed on at least one surface of the negative electrode current collector and comprises a first negative electrode active material, and the first negative electrode active material comprises graphite and has a particle size uniformity of from 0.4 to 0.6; and
the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, and the second negative electrode active material comprises artificial graphite and has a particle size uniformity of from 0.25 to 0.45; and
a ratio of the particle size uniformity of the first negative electrode active material to the particle size uniformity of the second negative electrode active material is from 1.05 to 1.9;
the first negative electrode active material has a volume distribution particle size DV50 of from 13.7 μm to 20.7 μm; and
the second negative electrode active material has a volume distribution particle size DV50 of from 10 μm to 18 μm; and
the first negative electrode active material comprises one or more of artificial graphite or natural graphite.