Lead storage battery

Patent metadata

Field	Value
Publication number	US-10714739-B2
Application number	US-201615748965-A
Country	US
Kind code	B2
Filing date	Jul 21, 2016
Priority date	Aug 4, 2015
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

Disclosed is a lead-acid battery including: a battery container; an electrolyte and an electrode plate group in the battery container; and a battery container cover that hermetically seals an opening of the battery container, wherein the electrode plate group includes a positive electrode plate including a positive electrode active material, a negative electrode plate including a negative electrode active material, and a separator interposed between the positive electrode plate and the negative electrode plate, the battery container cover is provided with a liquid port, a liquid port plug that closes the liquid port, and a sleeve that hangs down from the liquid port to a prescribed liquid surface height of the electrolyte, a sodium ion concentration contained in the electrolyte is 1 mmol/L to 90 mmol/L, and a specific surface area of the positive electrode active material is 5 m2/g to 9 m2/g.

First claim

The invention claimed is:

1. A lead-acid battery comprising:
a battery container;
an electrolyte accommodated inside the battery container;
an electrode plate group that is accommodated inside the battery container and is immersed in the electrolyte; and
a battery container cover that hermetically seals an opening of the battery container, wherein
the electrode plate group includes a positive electrode plate including a positive electrode active material, a negative electrode plate including a negative electrode active material, and a separator interposed between the positive electrode plate and the negative electrode plate,
the battery container cover is provided with a liquid port, a liquid port plug that closes the liquid port, and a sleeve that hangs down from the liquid port to a prescribed liquid surface height of the electrolyte,
a sodium ion concentration contained in the electrolyte is 1 mmol/L to 90 mmol/L, and
a specific surface area of the positive electrode active material is 5 m 2 /g to 9 m 2 /g.

2. The lead-acid battery in accordance with claim 1 , wherein
a lower end of the sleeve is located downward of a lower end of the battery container cover in a vertical direction, and
a gap between the lower end of the sleeve and the lower end of the battery container cover is 3 mm or less.

3. The lead-acid battery in accordance with claim 1 , wherein
a lower end of the sleeve is located upward of a lower end of the battery container cover in a vertical direction.

4. The lead-acid battery in accordance with claim 1 , wherein
a ratio (Me/Mp) of a mass (Me) of the electrolyte to a mass (Mp) of the positive electrode active material or a positive electrode material contained in the lead-acid battery in a fully charged state is within a range of 1.3 to 2.6.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Izumi Kenji
• Kojima Yu
• Hasegawa Mikihito
• Ooki Shinsuke

Classifications

• H01M50/627

  Filling ports · CPC title

• H01M10/08 Primary

  Selection of materials as electrolytes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/06

  Electrodes for primary cells · CPC title

• H01M4/625

  Carbon or graphite · CPC title