US 12,463,299 B2
Electrode assembly and battery cell
Huihui Liu, Ningde (CN); Hui Gu, Ningde (CN); Jingyu Cao, Ningde (CN); and Lin Ma, 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. 30, 2021, as Appl. No. 17/565,873.
Application 17/565,873 is a continuation of application No. PCT/CN2020/102832, filed on Jul. 17, 2020.
Claims priority of application No. 201910749926.3 (CN), filed on Aug. 14, 2019.
Prior Publication US 2022/0123444 A1, Apr. 21, 2022
Int. Cl. H01M 50/536 (2021.01); H01M 4/36 (2006.01); H01M 4/62 (2006.01); H01M 10/0525 (2010.01); H01M 50/543 (2021.01)
CPC H01M 50/536 (2021.01) [H01M 4/366 (2013.01); H01M 4/628 (2013.01); H01M 10/0525 (2013.01); H01M 50/543 (2021.01)] 9 Claims
OG exemplary drawing
 
1. A battery cell, wherein the battery cell comprises an electrode assembly, a housing, and a first electrode terminal;
the housing comprises an accommodation cavity, the electrode assembly is accommodated in the accommodation cavity, and the first electrode terminal is disposed in the housing;
the electrode assembly comprises a first electrode plate and a second electrode plate;
the first electrode plate comprises a first current collector, a first active material layer, and an insulation layer; the first current collector comprises a first body portion and a first tab extending from the first body portion, the first active material layer is at least partially coated on a surface of the first body portion, and the first tab protrudes out of the first body portion and is electrically connected with the first electrode terminal; and
the insulation layer is at least partially coated on a surface of the first tab, and an elastic modulus of the insulation layer is less than an elastic modulus of the first tab;
wherein the insulation layer comprises a first part and a second part; the first part is coated on the surface of the first body portion and connected to an end of the first active material layer, the end of the first active material layer being close to the first tab; and the second part extends from an end of the first part and is coated on the surface of the first tab, the end of the first part being away from the first active material layer;
wherein the second electrode plate comprises a second current collector and a second active material layer, and the second current collector comprises a second body portion and a second tab extending from the second body portion;
the second active material layer is coated on a surface of the second body portion, and the second tab protrudes out of the second body portion;
wherein the second electrode plate further comprises a third active material layer, and the third active material layer is coated on a surface of the second tab and connected to the second active material layer;
the first tab and the second tab are located on an identical side of the electrode assembly;
along a direction pointing to the first tab from the first body portion, an end of the third active material layer, which is away from the second active material layer, goes beyond the end of the first part, which is away from the first active material layer;
along a direction pointing to the first tab from the first body portion, an end of the second active material layer goes beyond a joint between the first part and the first active material layer but does not go beyond an end of the first part, the end of the first part being away from the first active material layer; and
the first body portion comprises a main body region and a transition region, the transition region is located between the main body region and the first tab, the first active material layer is coated on a surface of the main body region, the first part is coated on a surface of the transition region, the first tab protrudes from the first body portion from an end of the transition region far away from the main body region, and a length of the second part is smaller than a length of the first part along a width direction, the width direction being perpendicular to a thickness direction of the first electrode plate and a direction in which the first tab protrudes from the first body portion.