Sealed battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9368764-B2
Application number	US-201213646811-A
Country	US
Kind code	B2
Filing date	Oct 8, 2012
Priority date	Mar 10, 2009
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A sealed battery includes a sealing plate 13 sealing a mouth of an outer can, an external terminal 16 attached to the sealing plate 13 and having a connecting terminal 23 , and a current interruption mechanism 18 interrupting current in response to pressure increase in the outer can that is installed in a conductive pathway electrically connecting the connecting terminal 23 and an electrode assembly. In the connecting terminal 23 , a through-hole 23 b continuing to the space on the current interruption mechanism 18 at the side corresponding to the outside of the battery is formed. The through-hole 23 b is sealed with a terminal stopper 30 made of an elastic member so as to form a closed space between the terminal stopper 30 and current interruption mechanism 18 . An electrolyte or washing solution hardly enters the current interruption mechanism during the manufacture can be provided.

First claim

What is claimed is:

1. A sealed battery comprising:
an outer can including a mouth;
in the outer can, an electrode assembly including a positive electrode plate and a negative electrode plate;
a sealing plate sealing the mouth of the outer can; and
an external terminal attached to the sealing plate and including a connecting terminal, the connecting terminal and the electrode assembly being electrically connected;
in a conductive pathway electrically connecting the connecting terminal and the electrode assembly, a current interruption mechanism that interrupts current in response to pressure increase in the outer can being installed;
the connecting terminal including inside a through-hole continuing a space on the current interruption mechanism at a side corresponding to the outside of the battery; and
the through-hole being tightly sealed.

2. The sealed battery according to claim 1 , wherein
the through-hole is sealed with a terminal stopper.

3. The sealed battery according to claim 2 , wherein
the terminal stopper includes an elastic member.

4. The sealed battery according to claim 2 , wherein
the terminal stopper includes a metallic member.

5. The sealed battery according to claim 2 , wherein
the terminal stopper includes an elastic member and a metallic member.

6. A sealed battery comprising:
an outer can including a mouth;
in the outer can, an electrode assembly including a positive electrode plate and a negative electrode plate;
a sealing plate sealing the mouth of the outer can; and
an external terminal attached to the sealing plate and including a connecting terminal, the connecting terminal and the electrode assembly being electrically connected;
in a conductive pathway electrically connecting the connecting terminal and the electrode assembly, a current interruption mechanism that interrupts current in response to pressure increase in the outer can being installed;
the connecting terminal including inside a through-hole continuing a space on the current interruption mechanism at a side corresponding to the outside of the battery; and
the through-hole being sealed with a metallic member.

7. The sealed battery according to claim 6 , wherein
the metallic member is welded to the connecting terminal.

8. The sealed battery according to claim 7 , wherein the metallic terminal member is fitted into the through-hole and is welded to the connecting terminal.

9. The sealed battery according to claim 3 , wherein
the through-hole formed in the connecting terminal includes a large diameter portion formed outside of the outer can and a small diameter portion formed inside of the outer can;
the terminal stopper includes, at an upper end, a head portion having a diameter larger than that of the small diameter portion of the through-hole and smaller than that of the large diameter portion of the through-hole, at a lower end, a protruding portion having a diameter smaller than that of the head portion and larger than that of the small diameter portion of the through-hole, a locking portion tapering from the protruding portion, and between the head portion and the protruding portion, a connecting portion having almost the same diameter as that of the small diameter portion of the through-hole and having substantially the same length as that of the small diameter portion of the through-hole; and
the terminal stopper is attached to the through-hole in which the head portion is placed on a side of the large diameter portion of the through-hole and the locking portion is protruded from an end of the small diameter portion of the through-hole.

Assignees

• Sanyo Electric Co

Inventors

• Nansaka Kenji
• Yamauchi Yasuhiro
• Nohma Toshiyuki

Classifications

• H01M10/42 Primary

  Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells (H01M10/60 takes precedence) · CPC title

• H01M50/627

  Filling ports · CPC title

• H01M50/197

  having a layered structure · CPC title

• H01M50/198

  characterised by physical properties, e.g. adhesiveness or hardness · CPC title

• H01M10/05 Primary

  Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence) · CPC title