US 11,996,578 B2
Vent plug for lead-acid battery and lead-acid battery
Tatsuya Morii, Shizuoka (JP); Shinsuke Oki, Shizuoka (JP); and Yu Kojima, Shizuoka (JP)
Assigned to GS Yuasa International Ltd., Kyoto (JP)
Appl. No. 17/760,954
Filed by GS Yuasa International Ltd., Kyoto (JP)
PCT Filed Sep. 7, 2020, PCT No. PCT/JP2020/033731
§ 371(c)(1), (2) Date Mar. 16, 2022,
PCT Pub. No. WO2021/054164, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 2019-171065 (JP), filed on Sep. 20, 2019.
Prior Publication US 2022/0336912 A1, Oct. 20, 2022
Int. Cl. H01M 50/308 (2021.01); H01M 10/06 (2006.01)
CPC H01M 50/308 (2021.01) [H01M 10/06 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A vent plug for a lead-acid battery comprising:
a head portion;
a cylindrical portion extending from the head portion; and
a filter provided inside the cylindrical portion,
wherein, in a case where an end portion of the cylindrical portion on the head portion side is defined as a first end portion, and an end portion of the cylindrical portion on a side opposite to the first end portion is defined as a second end portion,
the cylindrical portion includes:
a cylinder portion;
a screw thread portion having a spiral shape and provided on an outer peripheral surface of the cylinder portion;
a slit; and
a through hole that allows an inside and an outside of the cylinder portion to communicate with each other,
wherein the filter is disposed at a position where the through hole is provided in an axial direction of the cylindrical portion,
wherein, in a case where a circumferential position where a start end portion, which is an end portion of the screw thread portion on the second end portion side, is located is defined as a first circumferential position, and a screw thread located closer to the first end portion side from the start end portion than the start end portion at the first circumferential position and located closest to the second end portion side is defined as a first-peripheral screw thread portion, the screw thread portion intersects the slit only at the first-peripheral screw thread portion when the cylindrical portion is viewed in a plan view from a radially outer side of the cylinder portion, and
wherein the first peripheral screw thread portion is cut out and divided by the slit where the screw thread portion intersects the slit.