Lead acid battery

Patent metadata

Field	Value
Publication number	US-10205193-B2
Application number	US-201515549867-A
Country	US
Kind code	B2
Filing date	Dec 4, 2015
Priority date	Feb 12, 2015
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A lead acid battery including: a positive electrode plate including a positive electrode grid and a positive electrode active material; a negative electrode plate including a negative electrode grid and a negative electrode active material; an electrode plate group including the positive electrode plate, the negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate; a battery container including a plurality of cell chambers each accommodating the electrode plate group and an electrolyte; and a lid sealing an opening of the battery container. A ratio P/N of mass P of the positive electrode active material to mass N of the negative electrode active material is 1.25 or more and 1.65 or less. The negative electrode grid contains bismuth in an amount of 1 ppm or more and 300 ppm or less.

First claim

The invention claimed is:

1. A lead acid battery comprising:
a positive electrode plate including a positive electrode grid and a positive electrode active material;
a negative electrode plate including a negative electrode grid and a negative electrode active material;
an electrode plate group including the positive electrode plate, the negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate;
a battery container including a plurality of cell chambers each accommodating the electrode plate group and an electrolyte; and
a lid sealing an opening of the battery container;
a ratio P/N of mass P of the positive electrode active material to mass N of the negative electrode active material being 1.25 or more and 1.65 or less,
the negative electrode grid containing bismuth in an amount of 1 ppm or more and 300 ppm or less.

2. The lead acid battery of claim 1 , wherein the ratio P/N is more than 1.43 and 1.65 or less.

3. The lead acid battery of claim 1 , wherein the ratio P/N is 1.25 or more and 1.43 or less, and the negative electrode active material contains carbon in an amount of 0.10 mass % or more and 0.45 mass % or less.

4. The lead acid battery of claim 1 , wherein a liquid level of the electrolyte is above a top of the electrode plate group.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Izumi Kenji
• Sato Yoshinobu
• Ogasawara Etsuko
• Chiba Takeshi
• Kojima Yu
• Sugie Kazuhiro

Classifications

• H01M4/685

  Lead alloys · CPC title

• H01M4/68

  for use in lead-acid accumulators · CPC title

• H01M4/73

  for lead-acid accumulators, e.g. frame plates · CPC title

• H01M10/12 Primary

  Construction or manufacture · CPC title

• H01M4/625

  Carbon or graphite · CPC title