Lead-acid battery and method of manufacturing lid member of lead-acid battery

Patent metadata

Field	Value
Publication number	US-2016293918-A1
Application number	US-201615082184-A
Country	US
Kind code	A1
Filing date	Mar 28, 2016
Priority date	Mar 30, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Provided is a lead-acid battery which includes: an element; an electrolyte solution; a container housing the element and the electrolyte solution; and a lid member sealing the container, wherein the lid member includes: a middle lid covering the container; an upper lid welded to an upper portion of the middle lid in an overlapping manner; and an exhaust passage arranged between the middle lid and the upper lid, through which an inside of the container is communicated with an outside, wherein a bottom surface of the exhaust passage is inclined such that the solution in the passage returns into the container, and the upper lids include: a passage wall welded to the middle lid and forming a side wall of the exhaust passage; and a transverse wall formed on a ceiling surface of the exhaust passage and traversing the exhaust passage, and a lower end portion of the transverse wall is positioned above a welded portion between the passage wall and the middle lid.

First claim

What is claimed is:

1 . A lead-acid battery comprising:
an element; an electrolyte solution; a container housing the element and the electrolyte solution; and a lid member sealing the container, wherein the lid member includes:
a middle lid covering the container;
an upper lid welded to an upper portion of the middle lid in an overlapping manner; and
an exhaust passage arranged between the middle lid and the upper lid, through which an inside of the container is communicated with an outside,
wherein a bottom surface of the exhaust passage is inclined such that the solution in the passage returns into the container, and wherein the upper lid includes:
a passage wall welded to the middle lid and forming a side wall of the exhaust passage; and
a transverse wall formed on a ceiling surface of the exhaust passage and traversing the exhaust passage, and
a lower end portion of the transverse wall is positioned above a welded portion between the passage wall and the middle lid.

2 . The lead-acid battery according to claim 1 , wherein a projecting height of the transverse wall from the ceiling surface is 1.0 mm or more.

3 . The lead-acid battery according to claim 1 , wherein the container is partitioned into a plurality of cell chambers,
wherein the exhaust passage includes a plurality of individual passages which communicate with the plurality of cell chambers, respectively, and a common passage which is communicated with the individual passages and collectively discharges a gas from the individual passages to the outside, and wherein at least one transverse wall is formed on each of ceiling surfaces of the individual passages.

4 . The lead-acid battery according to claim 3 , wherein at least the upper lid is melted so as to weld the middle lid and the upper lid to each other.

5 . The lead-acid battery according to claim 3 , wherein the transverse wall is provided on an extension of the passage wall.

6 . The lead-acid battery according to claim 3 , wherein the individual passage includes a bent portion at which the individual passage is bent, and
the transverse wall is arranged corresponding to the bent portion.

7 . The lead-acid battery according to claim 3 , wherein the middle lid includes a lower-side passage wall which projects upward toward an upper lid side,
wherein the upper lid includes an upper-side passage wall which projects downward toward a middle lid side, and is welded to the lower-side passage wall, and wherein the transverse wall is positioned above a welded portion between the upper-side passage wall and the lower-side passage wall.

8 . The lead-acid battery according to claim 3 , wherein the transverse wall is provided at a portion of the individual passage where a passage width changes from a wide state to a narrow state in a direction toward an exhaust outlet direction.

9 . The lead-acid battery according to claim 3 , wherein the middle lid includes a communication hole through which the inside of the container and the individual passage are communicated with each other,
wherein the upper lid includes an exhaust sleeve portion which surrounds a periphery of the communication hole formed in the middle lid and in which an opening portion which is made to communicate with the individual passage is formed, and wherein the transverse wall is arranged away from the opening portion of the exhaust sleeve portion.

10 . A method of manufacturing a lid member which seals a container of a lead-acid battery, wherein the lid member includes: a middle lid covering the container; an upper lid welded to an upper portion of the middle lid in an overlapping manner; and an exhaust passage arranged between the middle lid and the upper lid, through which an inside of the container is communicated with an outside, wherein a bottom surface of the exhaust passage is inclined such that the solution in the passage returns into the container, and the upper lids include: a passage wall welded to the middle lid and forming a side wall of the exhaust passage; and a transverse wall formed on a ceiling surface of the exhaust passage and traversing the exhaust passage, a height of the transverse wall being set lower than a height of the passage wall,
wherein the method comprises a welding in which the passage wall of the upper lid is melted by being brought into contact with a heating member and, thereafter, the passage wall is brought into contact with the middle lid thus welding the passage wall of the upper lid and the middle lid to each other, and wherein in the welding, the transverse wall of the upper lid is not brought into contact with the heating member so as to prevent the transverse wall from being melted.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Fujimoto Naoki

Classifications

• H01M10/06 Primary

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

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M50/114

  specially adapted for lead-acid cells · CPC title

• H01M50/169

  by welding, brazing or soldering · CPC title

• H01M50/367

  Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems · CPC title