US 12,191,519 B2
Secondary battery, method for manufacturing secondary battery, electronic device, and electric tool
Kunio Sodeyama, Kyoto (JP); Yu Nomura, Kyoto (JP); Kosuke Yanagida, Kyoto (JP); Noriaki Kokubu, Kyoto (JP); and Hidehiko Wakui, Kyoto (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed by MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed on Apr. 14, 2022, as Appl. No. 17/720,628.
Application 17/720,628 is a continuation of application No. PCT/JP2020/044024, filed on Nov. 26, 2020.
Claims priority of application No. 2019-226492 (JP), filed on Dec. 16, 2019.
Prior Publication US 2022/0238955 A1, Jul. 28, 2022
Int. Cl. H01M 10/0587 (2010.01); H01M 50/169 (2021.01); H01M 50/342 (2021.01)
CPC H01M 50/342 (2021.01) [H01M 10/0587 (2013.01); H01M 50/169 (2021.01); H01M 2220/30 (2013.01)] 8 Claims
 
1. A secondary battery comprising:
an electrode wound body having a structure in which a band-shaped positive electrode and a band-shaped negative electrode are stacked and wound with a separator interposed therebetween;
an electrolyte solution;
a battery can that accommodates the electrode wound body and the electrolyte solution;
a battery lid that closes an open end portion of the battery can; and
a safety valve mechanism provided between the battery lid and the electrode wound body,
wherein the safety valve mechanism includes at least a safety cover,
an outer peripheral portion of the battery lid and an outer peripheral portion of the safety cover are joined, and
an area of a region where the outer peripheral portion of the battery lid and the outer peripheral portion of the safety cover are joined is 18.1% or more and 25.0% or less of a sectional area of the battery in a radial direction.