Nonaqueous secondary battery

Patent metadata

Field	Value
Publication number	US-2017018748-A1
Application number	US-201615207963-A
Country	US
Kind code	A1
Filing date	Jul 12, 2016
Priority date	Jul 14, 2015
Publication date	Jan 19, 2017
Grant date	—

Abstract

A gas release valve has a valve body that is made from rubber or resin and closes a communication passage providing communication between an outside and an inside of a battery case. In an inner communication passage, which is positioned on an inner side of the battery case with respect to a valve body in the communication passage, a moisture absorber is arranged in a state where gas in the battery case is able to pass inside the inner communication passage.

First claim

What is claimed is:

1 . A nonaqueous secondary battery comprising:
an electrode body having a positive electrode and a negative electrode; a battery case housing the electrode body; a safety valve provided in a wall part of the battery case, the safety valve tearing open when internal pressure of the battery case is a first pressure value or larger and releasing gas in the battery case outside; and a gas release valve, which has a valve body that is made from rubber or resin and closes a communication passage providing communication between an outside and an inside of the battery case, and a moisture absorber that is arranged inside an inner communication passage in a state where gas in the battery case is able to pass inside the inner communication passage, the inner communication passage being positioned in the communication passage on an inner side of the battery case with respect to the valve body, wherein the gas release valve is configured so as to (i) maintain the communication passage in a state of being closed by the valve body when internal pressure of the battery case is smaller than a second pressure value that is smaller than the first pressure value, (ii) release the state where the communication passage is closed by the valve body and discharges gas in the battery case outside through the communication passage when internal pressure of the battery case becomes the second pressure value or larger, and (iii) allow the communication passage to be closed by the valve body again when internal pressure of the battery case becomes smaller than the second pressure value thereafter.

2 . The nonaqueous secondary battery according to claim 1 , wherein
the gas release valve is inserted into a liquid injection hole extending through the wall part of the battery case, and closes the liquid injection hole.

3 . The nonaqueous secondary battery according to claim 1 , wherein
at least a part of the moisture absorber is a porous body.

4 . The nonaqueous secondary battery according to claim 1 , wherein
at least a part of the moisture absorber is a plurality of granule moisture absorbers.

5 . The nonaqueous secondary battery according to claim 1 , wherein
at least a part of the moisture absorber is a moisture absorber in which a sheet-shaped moisture absorber is wound.

6 . A nonaqueous secondary battery comprising:
an electrode body having a positive electrode and a negative electrode; a battery case housing the electrode body; a safety valve provided in a wall part of the battery case, the safety valve tearing open when internal pressure of the battery case is a first pressure value or larger and releasing gas in the battery case outside; and a gas release valve including (i) a valve body that is made from rubber or resin and closes a communication passage providing communication between an outside and an inside of the battery case, (ii) a moisture absorber that is arranged inside an inner communication passage and has a gas permeability, and (iii) an elastic body that urges a second pressure value that is smaller than the first pressure value with respect to the valve body in a direction from an outside to an inside of the battery case.

Assignees

• Toyota Motor Co Ltd

Inventors

• Matsuura Tomohiro

Classifications

• H01M50/655

  specially adapted for venting · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M10/0583

  of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators · CPC title

• H01M2/1223 Primary

  Electricity · mapped topic