US 12,407,059 B2
Gas discharge valve of battery and battery
Yohei Muroya, Hyogo (JP); and Hiroshi Maesono, Hyogo (JP)
Assigned to SANYO Electric Co., Ltd., Osaka (JP)
Appl. No. 17/909,851
Filed by SANYO Electric Co., Ltd., Kadoma (JP)
PCT Filed Jan. 19, 2021, PCT No. PCT/JP2021/001686
§ 371(c)(1), (2) Date Sep. 7, 2022,
PCT Pub. No. WO2021/181893, PCT Pub. Date Sep. 16, 2021.
Claims priority of application No. 2020-039613 (JP), filed on Mar. 9, 2020.
Prior Publication US 2024/0204339 A1, Jun. 20, 2024
Int. Cl. H01M 50/342 (2021.01)
CPC H01M 50/3425 (2021.01) 4 Claims
OG exemplary drawing
 
1. A battery gas discharge valve formed at a battery, comprising:
a thin valve body to be opened to release gas from an inside to an outside of the battery when an internal pressure of the battery has reached a predetermined value or greater,
wherein the valve body includes a substantially annular main notch for opening the valve body and an auxiliary notch provided in a region inside the main notch,
the main notch and the auxiliary notch are coupled to each other at least at one location,
at a coupling portion between the main notch and the auxiliary notch, a curvature R1 of an inner corner of a bottom portion of the main notch is equal to or less than 0.05, and a curvature R2 of an outer corner of the bottom portion of the main notch is equal to or greater than 0.05, and
t2/t1≥0.16 is satisfied t1 is a thickness of the valve body at a portion thereof located in the opposite direction of the auxiliary notch when viewed from the coupling portion, and t2 is a thickness of the valve body at a portion thereof located below the bottom portion of the main notch.