Lead-acid battery

Patent metadata

Field	Value
Publication number	US-12463221-B2
Application number	US-202017614885-A
Country	US
Kind code	B2
Filing date	May 29, 2020
Priority date	May 31, 2019
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A lead-acid battery includes a positive electrode plate, a negative electrode plate, and an electrolyte solution. The negative electrode plate includes 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 1 H-NMR spectrum, or the negative electrode material contains a polymer compound having a repeating structure of oxy C 2-4 alkylene units.

First claim

The invention claimed is:

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 1 H-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 C 2-4 alkylene units and an esterified product of a hydroxy compound having the repeating structure of the oxy C 2-4 alkylene units, the hydroxy compound is at least one selected from the group consisting of a poly C 2-4 alkylene glycol, a copolymer having a repeating structure of oxy C 2-4 alkylene, and a C 2-4 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.

2 . The lead-acid battery according to claim 1 , wherein the content of the polymer compound in the negative electrode material is 16 ppm or more and 200 ppm or less on a mass basis.

3 . The lead-acid battery according to claim 1 , wherein the polymer compound contains an oxygen atom bonded to a terminal group and a —CH 2 — group and/or a —CH< group bonded to the oxygen atom, and
in the 1 H-NMR spectrum, a ratio of an integrated value of the peak to a sum of the integrated value of the peak, an integrated value of a peak of a hydrogen atom of the —CH 2 — group, and an integrated value of a peak of a hydrogen atom of the —CH< group is 85% or more.

4 . The lead-acid battery according to claim 1 , wherein the repeating structure of the oxy C 2-4 alkylene units contains at least a repeating structure of oxypropylene units.

5 . The lead-acid battery according to claim 1 , wherein the electrolyte solution contains the polymer compound, and
the concentration of the polymer compound in the electrolyte solution is 500 ppm or less on a mass basis.

6 . The lead-acid battery according to claim 1 , wherein the electrolyte solution contains the polymer compound, and
the concentration of the polymer compound in the electrolyte solution is 100 ppm or more on a mass basis.

7 . The lead-acid battery according to claim 1 , wherein the organic expander contains a first organic expander having a sulfur element content of 2,000 μmol/g or more.

8 . The lead-acid battery according to claim 7 , wherein the first organic expander contains a condensate containing a unit of an aromatic compound having a sulfur-containing group, and
the condensate contains, as the unit of the aromatic compound, at least one selected from the group consisting of a unit of a bisarene compound and a unit of a monocyclic aromatic compound.

9 . The lead-acid battery according to claim 8 , wherein the condensate contains the unit of the bisarene compound and the unit of the monocyclic aromatic compound.

10 . The lead-acid battery according to claim 8 , wherein the unit of the monocyclic aromatic compound includes a unit of a hydroxyarene compound.

11 . The lead-acid battery according to claim 1 , wherein the organic expander contains a second organic expander having a sulfur element content of less than 2,000 μmol/g.

12 . The lead-acid battery according to claim 1 , wherein the polymer compound is one selected from a group consisting of polypropylene glycol, polyoxyethylene polyoxypropylene butyl ether, polyoxypropylene butyl ether, polyoxypropylene methyl ether, polyoxypropylene ethyl ether and polyoxypropylene acetate.

13 . 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 having a repeating structure of oxy C 2-4 alkylene units, 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 C 2-4 alkylene units and an esterified product of a hydroxy compound having the repeating structure of the oxy C 2-4 alkylene units, the hydroxy compound is at least one selected from the group consisting of a poly C 2-4 alkylene glycol, a copolymer having a repeating structure of oxy C 2-4 alkylene, and a C 2-4 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.

14 . The lead-acid battery according to claim 13 , wherein the content of the polymer compound in the negative electrode material is 16 ppm or more and 200 ppm or less on a mass basis.

15 . The lead-acid battery according to claim 13 , wherein the polymer compound contains an oxygen atom bonded to a terminal group and a —CH 2 — group and/or a —CH< group bonded to the oxygen atom, and
in the 1 H-NMR spectrum, a ratio of an integrated value of the peak to a sum of the integrated value of the peak, an integrated value of a peak of a hydrogen atom of the —CH 2 — group, and an integrated value of a peak of a hydrogen atom of the —CH< group is 85% or more.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Kagohashi Hiroki
• Kumagai Yusuke

Classifications

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/622

  being polymers · CPC title

• H01M2300/0011

  Sulfuric acid-based · CPC title

• H01M4/56

  of lead · CPC title

• H01M10/06 Primary

  Lead-acid accumulators (semi-lead accumulators H01M10/20) · CPC title