US 12,191,500 B2
Negative current collector, negative electrode plate, electrochemical apparatus, battery module, battery pack, and device
Xin Liu, Ningde (CN); Mingling Li, Ningde (CN); Jia Peng, Ningde (CN); Qisen Huang, Ningde (CN); and Chengdu Liang, 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 Dec. 4, 2020, as Appl. No. 17/112,775.
Application 17/112,775 is a continuation of application No. PCT/CN2019/119740, filed on Nov. 20, 2019.
Claims priority of application No. 201910586045.4 (CN), filed on Jul. 1, 2019.
Prior Publication US 2021/0119219 A1, Apr. 22, 2021
Int. Cl. H01M 4/00 (2006.01); H01M 4/66 (2006.01); H01M 10/0525 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/667 (2013.01) [H01M 4/661 (2013.01); H01M 10/0525 (2013.01); H01M 2004/021 (2013.01); H01M 2004/027 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A negative current collector, comprising:
a support layer, wherein the support layer has at least two sublayers stacked in a thickness direction, the at least two sublayers comprise different polymer materials;
a metal conductive layer disposed on at least one of two opposite surfaces of the support layer in the thickness direction of the support layer; and
an upper protective layer comprising:
a first upper protective layer disposed on a surface of the metal conductive layer facing away from the support layer, the first upper protective layer comprising metal; and
a second upper protective layer disposed on a surface of the first upper protective layer facing away from the support layer, the second upper protective layer comprising metal oxide,
wherein:
a density of the support layer is less than a density of the metal conductive layer;
the density of the metal conductive layer is 8.0 g/cm3 to 8.96 g/cm3;
a thickness D1 of the metal conductive layer is 300 nm≤D1≤2 μm;
a thickness Da of the upper protective layer is 100 nm<Da≤200 nm; and
when a tensile strain of the negative current collector is 2.5%, a sheet resistance growth rate T of the metal conductive layer is T≤5%.