US 12,315,934 B2
Positive electrode plate, electrochemical apparatus, and apparatus
Jing Li, Ningde (CN); Qingrui Xue, Ningde (CN); Wei Li, Ningde (CN); Zige Zhang, Ningde (CN); Yang Zhang, Ningde (CN); and Xianwei Yang, 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 Oct. 14, 2021, as Appl. No. 17/501,895.
Application 17/501,895 is a continuation of application No. PCT/CN2019/129354, filed on Dec. 27, 2019.
Prior Publication US 2022/0037667 A1, Feb. 3, 2022
Int. Cl. H01M 4/66 (2006.01); H01M 4/02 (2006.01); H01M 4/62 (2006.01)
CPC H01M 4/662 (2013.01) [H01M 4/623 (2013.01); H01M 4/663 (2013.01); H01M 4/668 (2013.01); H01M 2004/028 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A positive electrode plate, comprising a current collector and an electrode active material layer disposed on at least one surface of the current collector, wherein
the current collector comprises a support layer and a conductive layer disposed on at least one surface of the support layer, a single-sided thickness D2 of the conductive layer along a thickness direction satisfies 30 nm≤D2≤3 μm, a thickness D1 of the support layer satisfies 1 μm≤D1≤30 μm, and the support layer along the thickness direction is made of a polymer material or a polymer composite material;
the electrode active material layer comprises an electrode active material, a binder, and a conductive agent, a total thickness Dtotal of the electrode active material layer is not greater than 170 μm, and a sheet resistance of the electrode active material layer ranges from 0.1 ohm to 10 ohms; and
the electrode plate has a length direction, which is a main dimension direction with a larger magnitude, and a width direction, which is a secondary dimension direction with a smaller magnitude, the length direction and the width direction are perpendicular to the thickness direction of the current collector,
when viewed in the width direction of a coated surface of the electrode plate, the electrode active material layer comprises 2n+1 zones classified by compacted density, and a compacted density of a middle zone is greater than a compacted density of zones on both sides, wherein n=1, 2, or 3.