Battery and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-10811669-B2
Application number	US-201615550668-A
Country	US
Kind code	B2
Filing date	Feb 9, 2016
Priority date	Feb 17, 2015
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

Provided is a battery capable of surely interrupting current at the time of temperature rise so that excessive heat generation does not occur at the occurrence of an abnormality. The battery 1 includes a battery element 10 including a positive electrode and a negative electrode, an inner package 13 which forms a first chamber 13 a for enclosing the battery element 10, an outer package 14 which encloses the inner package 13 such that the outer package 14 forms a second chamber 14 a which surrounds the first chamber 13 a, and a pair of terminals 11, 12 electrically connected to the positive electrode and the negative electrode and led out to the outside of the outer package 14. One terminal 11 of the pair of terminals 11, 12 has a first terminal 11 a and a second terminal 11 b arranged so as to be electrically connected in the second chamber 13 a. A gas generating material 14 which generates gas at a predetermined temperature or higher or a predetermined voltage or higher is enclosed in the first chamber 13 a or the second chamber 14 a.

First claim

The invention claimed is:

1. A battery comprising:
a battery element including a positive electrode and a negative electrode;
an inner package forming a first chamber for enclosing the battery element; and
an outer package covering the inner package so as to form a second chamber surrounding the first chamber;
a pair of terminals electrically connected to the positive electrode and the negative electrode and led out to the outside of the outer package,
wherein at least one terminal of the pair of terminals has a first terminal and a second terminal arranged so as to be electrically connected in the second chamber, and
a gas generating material is enclosed in the first chamber or the second chamber, wherein the gas generating material generates gas at a predetermined temperature or higher or a predetermined voltage or higher.

2. The battery according to claim 1 , wherein the battery element includes an electrolyte containing the gas generating material.

3. The battery according to claim 1 , wherein an electrolyte containing the gas generating material is enclosed in the second chamber.

4. The battery according to claim 1 , wherein the outer package is configured to expand in a terminal direction, which is a direction in which the second terminal is led out.

5. The battery according to claim 4 , wherein the outer package is bent in a thickness direction of the first chamber.

6. The battery according to claim 2 , wherein the outer package is configured such that the second chamber inflates in a thickness direction of the battery element.

7. The battery according to claim 6 , wherein the first terminal is joined to one inner surface of the opposing outer package and the second terminal is joined to the other inner surface in the second chamber.

8. The battery according to claim 1 , wherein the first terminal and the second terminal are temporarily fixed in contact with each other.

9. The battery according to claim 8 , wherein the first terminal and the second terminal are temporarily fixed by coating a portion where the first terminal and the second terminal are in contact with each other from the outside with a thermoplastic resin.

10. The battery according to claim 1 , wherein the gas generating material comprises a volatile material.

11. The battery according to claim 10 , wherein the volatile material is a solvent.

12. The battery according to claim 11 , wherein a volatilization temperature of the solvent is 50° C. or more and less than 200° C.

13. The battery according to claim 11 , wherein the solvent is a nonaqueous solvent.

14. The battery according to claim 13 , wherein the nonaqueous solvent contains an electrolyte component.

15. A battery pack comprising:
at least one battery according to claim 1 ; and
a holding member which holds the battery by sandwiching the battery from both sides in the thickness direction.

16. A method for manufacturing a battery, comprising steps of:
enclosing a battery element including a positive electrode and a negative electrode in a first chamber formed by an inner package, after connecting a pair of first terminals to the positive electrode and the negative electrode, with the pair of first terminals led out from the inner package; and
enclosing the inner package in a second chamber formed outside of the inner package by an outer package, wherein the step includes arranging a second terminal such that at least one first terminal of the pair of first terminals is electrically connected in the second chamber and covering the inner package with the outer package;
wherein the step of enclosing the battery element in the first chamber or the step of enclosing the inner package in the second chamber includes enclosing a gas generating material, which generate gas at a predetermined temperature or higher or a predetermined voltage or higher, together.

17. The method for manufacturing the battery according to claim 16 , wherein the step of covering the inner package with the outer package includes joining the first terminal to one surface of the opposing outer package and joining the second terminal to the other surface thereof, in the second chamber.

18. The method for manufacturing the battery according to claim 16 , wherein the step of covering the inner package with the outer package includes temporarily fixing the second terminal in a state of being electrically connected to the first terminal.

Assignees

• Nec Corp

Inventors

• Inoue Kazuhiko
• Shimura Kenichi

Classifications

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/562

  characterised by the material · CPC title

• H01M50/211

  adapted for pouch cells · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title