(19)

(11)

EP 4 229 703 A2

(12)

(88) Date of publication A3: 15.09.2022 (43) Date of publication: 23.08.2023 Bulletin 2023/34 (21) Application number: 21883679.9 (22) Date of filing: 19.10.2021

(51) International Patent Classification (IPC):  H01M 10/0525(2010.01) H01M 4/36(2006.01) H01M 10/0569(2010.01) (52) Cooperative Patent Classification (CPC): Y02E 60/13; H01G 11/36; H01G 11/38; H01G 11/24; H01G 11/70; H01G 11/28; H01G 11/32; H01G 11/06 (86) International application number: PCT/US2021/055562 (87) International publication number: WO 2022/086930 (28.04.2022 Gazette 2022/17)

(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: 19.10.2020 US 202063093441 P (71) Applicant: Fastcap Systems Corporation Wakefield, MA 01880 (US)	(72) Inventors: CHEN, Ji M. Boston, Massachusetts 02210 (US) CAO, Wanjun Ben Boston, Massachusetts 02210 (US) PARK, Ki M. Boston, Massachusetts 02210 (US) BRAMBILLA, Nicolo M. Boston, Massachusetts 02210 (US) (74) Representative: HGF  HGF Limited 1 City Walk Leeds LS11 9DX Leeds LS11 9DX (GB)