Lead-acid battery

Patent metadata

Field	Value
Publication number	US-10608242-B2
Application number	US-201615562762-A
Country	US
Kind code	B2
Filing date	Mar 28, 2016
Priority date	Mar 30, 2015
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A lead-acid battery includes a negative electrode plate that comprises: a negative electrode material which has a density of 2.7 g/cm 3 or more and 3.8 g/cm 3 or less and contains an organic expander having an S element content of 3900 μmol/g or more; and a current collector.

First claim

The invention claimed is:

1. A lead-acid battery comprising:
a negative electrode material,
wherein the negative electrode material has a density of 2.7 g/cm 3 or more and 3.8 g/cm 3 or less and contains an organic expander,
the organic expander has a sulfur element (S element) content of 4300 μmol/g or more.

2. The lead-acid battery according to claim 1 , wherein the S element content of the organic expander is 4300 μmol/g or more and 6000 μmol/g or less.

3. The lead-acid battery according to claim 1 , wherein the organic expander is a synthetic polymer.

4. The lead-acid battery according to claim 3 , wherein the organic expander is bisphenols condensate.

5. The lead-acid battery according to claim 3 , wherein the S element content of the organic expander is a total amount of a sulfonic acid group and a sulfonyl group.

6. The lead-acid battery according to claim 1 , further comprising a negative electrode plate containing the negative electrode material,
wherein the sulfur element (S element) content is measured as a S element content in a powder specimen obtained by taking out the negative electrode plate from the lead-acid battery, washing the negative electrode plate with water to eliminate a sulfuric acid content, separating the negative electrode material from the negative electrode plate whose sulfuric acid content is removed, immersing the negative electrode material in a 1 mol/L sodium hydroxide aqueous solution, desalting a solution obtained by removing, by filtration, a component which is insoluble in the aqueous solution, and condensing and drying the desalted solution.

7. The lead-acid battery according to claim 6 , wherein the powder specimen is a synthetic polymer.

8. The lead-acid battery according to claim 7 , wherein the powder specimen is bisphenols condensate.

9. The lead-acid battery according to claim 7 , wherein the S element content of the powder specimen is a total amount of a sulfonic acid group and a sulfonyl group.

10. A method for manufacturing a lead-acid battery, comprising:
filling a negative electrode material in a current collector to prepare a negative electrode; and

performing a formation of the negative electrode,
wherein the negative electrode material in the negative electrode after performing the formation has a density of 2.7 g/cm 3 or more and 3.8 g/cm 3 or less and contains an organic expander, and
the organic expander has a sulfur element (S element) content of 4300 μmol/g or more.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Sasaki Eriko
• Motoi Ikumi

Classifications

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/14 Primary

  Electrodes for lead-acid accumulators · CPC title

• H01M8/1055

  Inorganic layers on the polymer electrolytes, e.g. inorganic coatings · CPC title

• H01M4/16

  Processes of manufacture · CPC title

• H01M8/08

  Fuel cells with aqueous electrolytes · CPC title