US 12,463,221 B2
Lead-acid battery
Hiroki Kagohashi, Kyoto (JP); and Yusuke Kumagai, Kyoto (JP)
Assigned to GS Yuasa International Ltd., Kyoto (JP)
Appl. No. 17/614,885
Filed by GS Yuasa International Ltd., Kyoto (JP)
PCT Filed May 29, 2020, PCT No. PCT/JP2020/021475
§ 371(c)(1), (2) Date Nov. 29, 2021,
PCT Pub. No. WO2020/241878, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 2019-103301 (JP), filed on May 31, 2019.
Prior Publication US 2022/0200007 A1, Jun. 23, 2022
Int. Cl. H01M 4/62 (2006.01); H01M 4/02 (2006.01); H01M 4/14 (2006.01); H01M 4/56 (2006.01); H01M 10/06 (2006.01); H01M 10/08 (2006.01)
CPC H01M 4/627 (2013.01) [H01M 4/14 (2013.01); H01M 4/622 (2013.01); H01M 10/06 (2013.01); H01M 10/08 (2013.01); H01M 2004/027 (2013.01); H01M 4/56 (2013.01); H01M 4/625 (2013.01); H01M 2300/0011 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A lead-acid battery comprising a positive electrode plate, a negative electrode plate, and an electrolyte solution,
wherein the negative electrode plate comprises a negative electrode material,
the negative electrode material contains a polymer compound,
the polymer compound has a peak in a range of 3.2 ppm or more and 3.8 ppm or less in a chemical shift of 1H-NMR spectrum,
the polymer compound contains at least one selected from the group consisting of an etherified product of a hydroxy compound having a repeating structure of oxy C2-4 alkylene units and an esterified product of a hydroxy compound having the repeating structure of the oxy C2-4 alkylene units,
the hydroxy compound is at least one selected from the group consisting of a poly C2-4 alkylene glycol, a copolymer having a repeating structure of oxy C2-4 alkylene, and a C2-4 alkylene oxide adduct of a polyol,
the negative electrode material further contains an organic expander,
a content of the polymer compound in the negative electrode material is 16 ppm or more and 350 ppm or less on a mass basis, and
a number average molecular weight of the polymer compound is 1,000 or more and 5,000 or less.