(19)

(11)

EP 3 948 991 A1

(12)

(43) Date of publication: 09.02.2022 Bulletin 2022/06 (21) Application number: 20894239.1 (22) Date of filing: 29.06.2020

(51) International Patent Classification (IPC):  H01M 4/62(2006.01) (52) Cooperative Patent Classification (CPC): Y02E 60/10; H01M 4/134; H01M 4/366; H01M 10/0525; H01M 4/382; H01M 4/386; H01M 4/483 (86) International application number: PCT/CN2020/098881 (87) International publication number: WO 2021/103523 (03.06.2021 Gazette 2021/22)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 28.11.2019 CN 201911193150 (71) Applicant: Ningde Amperex Technology Limited Ningde, Fujian 352100 (CN)	(72) Inventors: CHEN, Maohua Ningde, Fujian 352100 (CN) LI, Daguang Ningde, Fujian 352100 (CN) XIE, Yuansen Ningde, Fujian 352100 (CN) (74) Representative: Icosa  83 avenue Denfert-Rochereau 75014 Paris 75014 Paris (FR)