(19)
(11) EP 4 369 466 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
26.06.2024 Bulletin 2024/26

(43) Date of publication:
15.05.2024 Bulletin 2024/20

(21) Application number: 23825593.9

(22) Date of filing: 10.07.2023
(51) International Patent Classification (IPC): 
H01M 10/0587(2010.01)
H01M 10/0525(2010.01)
 H01M 4/13(2010.01)
(52) Cooperative Patent Classification (CPC):
H01M 4/13; H01M 10/0525; H01M 10/0587; Y02P 70/50; Y02E 60/10; H01M 4/62; H01M 10/4235; H01M 2004/027; H01M 10/0431; H01M 4/366; H01M 2004/021; H01M 50/538
(86) International application number:
PCT/CN2023/106640
(87) International publication number:
WO 2024/055733 (21.03.2024 Gazette 2024/12)
(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA
Designated Validation States:
KH MA MD TN

(30) Priority: 15.09.2022 CN 202222450151 U
09.10.2022 CN 202222650473 U

(71) Applicant: Zhuhai CosMX Battery Co., Ltd.
Zhuhai, Guangdong 519180 (CN)

(72) Inventors:
  • ZHANG, Baohai
    Zhuhai, Guangdong 519180 (CN)
  • PENG, Chong
    Zhuhai, Guangdong 519180 (CN)
  • LI, Junyi
    Zhuhai, Guangdong 519180 (CN)

(74) Representative: Bandpay & Greuter 
11 rue Christophe Colomb
75008 Paris
75008 Paris (FR)

   


(54) ROLLED CORE AND BATTERY


(57) The present application provides a rolled core and a battery, where the rolled core includes a positive electrode piece having a paste-removal portion of positive electrode piece, and a negative electrode piece including a negative current collector (10), a negative active material layer (20), and a gap filling body (30); the paste-removal portion of positive electrode piece is a missing part of the positive electrode piece relative to the negative electrode piece at a winding-start end of the rolled core; the negative current collector (10) includes a first side and a second side which are opposite to each other, and at least one of the first side and the second side is provided with a negative active material layer (20); the gap filling body (30) is arranged on one of the first side and the second side at a position corresponding to the winding-start end of the rolled core. The present application improves the flatness of the inner ring of the rolled core of the battery, reduces expansion deformation of the battery caused by uneven stress during cyclic expansion process, and reduces capacity degradation and battery failure caused by the edge precipitation of lithium, thereby improving battery usage effect.