US 12,224,457 B2
Secondary battery
Naoto Akizuki, Kyoto (JP); Masahiro Otsuka, Kyoto (JP); and Morimichi Ozaki, Kyoto (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed by MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed on Oct. 21, 2021, as Appl. No. 17/506,792.
Application 17/506,792 is a continuation of application No. PCT/JP2020/016960, filed on Apr. 17, 2020.
Claims priority of application No. 2019-084574 (JP), filed on Apr. 25, 2019.
Prior Publication US 2022/0045407 A1, Feb. 10, 2022
Int. Cl. H01M 50/533 (2021.01); H01M 4/02 (2006.01); H01M 4/66 (2006.01); H01M 10/0525 (2010.01); H01M 10/0587 (2010.01); H01M 50/103 (2021.01); H01M 50/543 (2021.01); H01M 50/586 (2021.01); H01M 50/593 (2021.01)
CPC H01M 50/533 (2021.01) [H01M 4/661 (2013.01); H01M 10/0525 (2013.01); H01M 10/0587 (2013.01); H01M 50/103 (2021.01); H01M 50/543 (2021.01); H01M 50/586 (2021.01); H01M 50/593 (2021.01); H01M 2004/026 (2013.01); H01M 2220/30 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A secondary battery comprising an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte enclosed in an exterior case, wherein
the secondary battery includes a spacer positioned between the electrode assembly and the exterior case, wherein
the electrode assembly includes current collecting tabs of the positive electrode and the negative electrode each protruding from a same end face of the electrode assembly, wherein
the spacer is positioned between an end face of the electrode assembly, from which the current collecting tabs each protrude, and the exterior case, wherein
at least one of the current collecting tabs of the positive electrode or the negative electrode has a bent shape between the electrode assembly and the spacer, wherein
the electrode assembly has a separator extension portion in which the separator extends outward of the positive electrode and the negative electrode at the end face from which the current collecting tabs each protrude, and a portion having the bent shape of each of the current collecting tabs is in contact with the separator extension portion, wherein
the electrode assembly includes a wound electrode assembly, and the positive electrode, the negative electrode, and the separator are wound, wherein
at least part of the separator extension portion has a bent shape convex toward an outer periphery of the wound electrode assembly, and wherein
the electrode assembly has a convergence portion at which the separator extension portion converges, and a portion having the bent shape of the at least one current collecting tab is in contact with the convergence portion.