US 11,658,344 B2
Wound-type electrode assembly
Peipei Guo, Fujian (CN); Liangzhen Xiao, Fujian (CN); Wei Gao, Fujian (CN); Kefei Wang, Fujian (CN); Yi Zhao, Fujian (CN); and Ping He, Fujian (CN)
Assigned to NINGDE AMPEREX TECHNOLOGY LIMITED, Fujian (CN)
Filed by Ningde Amperex Technology Limited, Fujian (CN)
Filed on Nov. 19, 2018, as Appl. No. 16/194,539.
Application 16/194,539 is a continuation of application No. PCT/CN2016/087027, filed on Jun. 24, 2016.
Prior Publication US 2019/0089005 A1, Mar. 21, 2019
Int. Cl. H01M 10/0587 (2010.01); H01M 10/04 (2006.01); H01M 50/536 (2021.01); H01M 4/70 (2006.01); H01M 10/0525 (2010.01)
CPC H01M 10/0587 (2013.01) [H01M 4/70 (2013.01); H01M 10/0431 (2013.01); H01M 50/536 (2021.01); H01M 10/0525 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A wound-type electrode assembly, comprising:
a first electrode plate comprising:
a first current collector;
a first active substance layer coated on the surface of the first current collector; and
a first electrode tab;
a second electrode plate comprising:
a second current collector;
a second active substance layer coated on the surface of the second current collector; and
a second electrode tab;
a separator disposed between the first electrode plate and the second electrode plate to isolate the first electrode plate from the second electrode plate;
wherein the first electrode plate comprises a first winding start section, two surfaces of the first current collector of the first winding start section are not coated with the first active substance layer and are defined as a first start blank current collector, and the first electrode tab is fixed to the first start blank current collector;
a middle of the second electrode plate comprises a second groove, a bottom of the second groove is the second current collector and a circumference thereof is the second active substance layer; and the second electrode tab is accommodated in the second groove and electrically connected to the second current collector at the second groove and the second electrode plate further comprises a third groove located on an opposite side of the second current collector corresponding to the second groove, a bottom of the third groove is the second current collector and a circumference thereof is the second active substance layer;
wherein the wound-type electrode assembly further comprises a third double-sided insulating tape covering the entire third groove, and bonded respectively with the separator and the second active substance layer around the third groove by two surfaces of the third double-sided insulating tape; and
the separator comprises a separator winding start section, wherein the separator winding start section is located between the first start blank current collector and a portion of the first electrode plate in a thickness direction of the wound-type electrode assembly, the portion of the first electrode plate being next to the first winding start section along a winding direction of the wound-type electrode assembly and having one surface facing away from the separator winding start section coated with the first active substance layer.