US 12,451,521 B2
Secondary battery, electronic device, and electric tool
Kunio Sodeyama, Kyoto (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed by MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed on Aug. 2, 2022, as Appl. No. 17/879,144.
Application 17/879,144 is a continuation of application No. PCT/JP2021/006586, filed on Feb. 22, 2021.
Claims priority of application No. 2020-037805 (JP), filed on Mar. 5, 2020.
Prior Publication US 2022/0376307 A1, Nov. 24, 2022
Int. Cl. H01M 10/0587 (2010.01); H01M 10/0525 (2010.01); H01M 50/152 (2021.01)
CPC H01M 10/0587 (2013.01) [H01M 10/0525 (2013.01); H01M 50/152 (2021.01); H01M 2220/30 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
an electrode wound body having a structure in which a strip-shaped negative electrode and a strip-shaped positive electrode opposing each other are laminated and wound with a separator interposed therebetween;
a battery can accommodating the electrode wound body;
a battery lid provided over a cavity of the battery can; and
a negative electrode outer tab on an outermost periphery of the negative electrode,
wherein the positive electrode has a positive electrode end that is located toward the battery lid,
the battery can includes: a thick portion that is located toward the battery lid; a thin portion that is located toward a can bottom and has a thickness smaller than a thickness of the thick portion; and a thickness varying portion between the thick portion and the thin portion,
in a sectional view, the thick portion is disposed so as to overlap the positive electrode end, and
the thin portion or the thickness varying portion is disposed so as to overlap an end of the negative electrode outer tab that is located toward a battery lid in a sectional view.