US 12,412,933 B2
Electrode assembly, battery cell, battery, manufacturing method and device for electrode assembly
Hu Xu, Ningde (CN); Miaomiao Ren, Ningde (CN); Xing Li, Ningde (CN); and Haizu Jin, 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. 28, 2021, as Appl. No. 17/563,309.
Application 17/563,309 is a continuation of application No. PCT/CN2021/083434, filed on Mar. 26, 2021.
Prior Publication US 2022/0311056 A1, Sep. 29, 2022
Int. Cl. H01M 10/0587 (2010.01); H01M 4/02 (2006.01); H01M 10/42 (2006.01)
CPC H01M 10/0587 (2013.01) [H01M 4/02 (2013.01); H01M 2004/021 (2013.01); H01M 2010/4292 (2013.01); H01M 2220/20 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electrode assembly, comprising a negative electrode plate and a positive electrode plate, wherein:
the negative electrode plate and the positive electrode plate are laminated and wound to form a winding structure having a straight area, the negative electrode plate comprises a negative active material layer located in the straight area, the positive electrode plate comprises a positive active material layer located in the straight area and disposed opposite to the negative active material layer in a first direction, and the first direction is perpendicular to an axial direction of the winding structure;
the negative active material layer comprises a negative electrode main body portion and a negative electrode edge portion on both sides of the negative electrode main body portion in the axial direction, in the first direction, at least a part of the negative electrode main body portion and at least a part of the negative electrode edge portion on both sides of the negative electrode main body portion overlap with the positive active material layer, an active substance capacity per unit area of the negative electrode main body portion is greater than an active substance capacity per unit area of the negative electrode edge portion; and the positive active material layer comprises a positive electrode main body portion and a positive electrode edge portion on both sides of the positive electrode main body portion in the axial direction, in the first direction, at least a part of the positive electrode main body portion and at least a part of the positive electrode edge portion on both sides of the positive electrode main body portion overlap with the negative active material layer, an active substance capacity per unit area of the positive electrode main body portion is less than an active substance capacity per unit area of the positive electrode edge portion;
in the first direction, two ends of the negative electrode main body portion in the axial direction are aligned with two ends of the positive electrode main body portion in the axial direction, respectively;
the positive electrode plate further comprises a positive electrode current collecting body, and the positive electrode main body portion comprises a first positive electrode coating layer and a second positive electrode coating layer arranged at a same side of the positive electrode current collecting body, and the first positive electrode coating layer and the second positive electrode coating layer being laminated and arranged in the first direction, and comprising different materials or having different compositions;
the first positive electrode coating layer is a metal conductive layer without active material; and
the second positive electrode coating layer is coated on the positive electrode current collecting body, and the first positive electrode coating layer is coated on one side of the second positive electrode coating layer facing away from the positive electrode current collecting body.