US 12,218,321 B2
Catalyst device for lead-acid battery, and lead-acid battery
Kotaro Kobayashi, Tokyo (JP)
Assigned to W. L. GORE & ASSOCIATES G.K., Tokyo (JP)
Appl. No. 17/295,831
Filed by W. L. GORE & ASSOCIATES G.K., Tokyo (JP)
PCT Filed Nov. 26, 2018, PCT No. PCT/JP2018/043437
§ 371(c)(1), (2) Date May 20, 2021,
PCT Pub. No. WO2020/110179, PCT Pub. Date Jun. 4, 2020.
Prior Publication US 2022/0013819 A1, Jan. 13, 2022
Int. Cl. H01M 10/52 (2006.01); H01M 10/06 (2006.01); H01M 50/392 (2021.01); H01M 50/414 (2021.01)
CPC H01M 10/523 (2013.01) [H01M 10/06 (2013.01); H01M 50/392 (2021.01); H01M 50/414 (2021.01)] 9 Claims
OG exemplary drawing
 
1. A catalyst device for a lead-acid battery, comprising:
a catalyst layer comprising a catalyst to accelerate a reaction for generating water or water vapor from oxygen and hydrogen; and
a porous membrane defining a plurality of pores; and the porous membrane comprising thermoplastic resin having a melting point or a glass transition temperature of 160° C. or less, and
wherein at least one surface of the catalyst layer is in contact with the porous membrane, and
the porous membrane has a planar size being equal to or greater than that of the catalyst layer, and
the catalyst device further comprising an expanded porous polytetrafluoroethylene membrane having a Gurley number of 100 seconds or more, and being in contact with the porous membrane on the side opposite to the catalyst layer, wherein the porous membrane is between the expanded porous polytetrafluoroethylene membrane and the catalyst layer;
wherein the catalyst layer, porous membrane and expanded polytetrafluoroethylene membrane are stacked in order from the inside of the battery of (1) the expanded porous PTFE membrane, (2) the porous membrane, (3) the catalyst layer.