Deformation detection sensor for sealed secondary battery, sealed secondary battery, and deformation detection method for sealed secondary battery

Patent metadata

Field	Value
Publication number	US-10122050-B2
Application number	US-201515308970-A
Country	US
Kind code	B2
Filing date	Jun 4, 2015
Priority date	Jun 27, 2014
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

The present invention provides a deformation detection sensor for a sealed secondary battery, that makes it possible to detect deformation resulting from swelling of a cell with a high degree of sensitivity, that does not restrict capacity, and that has excellent stability. The deformation detection sensor for a sealed secondary battery includes a polymer matrix layer 3 and a detection unit 4 . The polymer matrix layer 3 contains a magnetic filler that is dispersed therein and that changes an external field in accordance with deformation of the polymer matrix layer 3 . The detection unit 4 detects change in the external field. The polymer matrix layer 3 is sandwiched in a gap between adjacent cells 2 and mounted in a compressed state.

First claim

The invention claimed is:

1. A deformation detection sensor for a sealed secondary battery, comprising a polymer matrix layer and a detection unit, wherein
the polymer matrix layer contains a filler that is dispersed therein and that changes an external field in accordance with deformation of the polymer matrix layer, and the detection unit detects change in the external field;
the polymer matrix layer is sandwiched in a gap and mounted in a compressed state; and
wherein
the polymer matrix layer contains a magnetic filler as the filler, and
the detection unit detects change in a magnetic field as the external field.

2. The deformation detection sensor for a sealed secondary battery according to claim 1 , wherein a compression ratio of the polymer matrix layer is from 1.05 to 2.0.

3. The deformation detection sensor for a sealed secondary battery according to claim 1 , wherein an Asker C hardness of the polymer matrix layer is from 1 to 50.

4. The deformation detection sensor for a sealed secondary battery according to claim 1 , wherein the polymer matrix layer is a foamed body containing bubbles.

5. The deformation detection sensor for a sealed secondary battery according to claim 4 , wherein a bubble content ratio of the foamed body is from 20 to 80 vol %.

6. The deformation detection sensor for a sealed secondary battery according to claim 4 , wherein an average bubble diameter of the foamed body is from 50 to 300 μm.

7. The deformation detection sensor for a sealed secondary battery according to claim 4 , wherein an independent-bubble ratio of the foamed body is from 5 to 70%.

8. A sealed secondary battery comprising the deformation detection sensor according to claim 1 mounted thereon.

9. A deformation detection method for a sealed secondary battery, in which a polymer matrix layer is mounted in a compressed state in a form of being sandwiched in a gap, and the polymer matrix layer contains a filler that is dispersed therein and that changes an external field in accordance with deformation of the polymer matrix layer, the method comprising:
detecting change in the external field accompanying the deformation of the polymer matrix layer, and detecting deformation of the sealed secondary battery on a basis of the detected change in the external field; and
wherein
the polymer matrix layer contains a magnetic filler as the filler, and
the detection unit detects change in a magnetic field as the external field.

10. The deformation detection method for a sealed secondary battery according to claim 9 , wherein a compression ratio of the polymer matrix layer is from 1.05 to 2.0.

Assignees

• Toyo Tire & Rubber Co

Inventors

• Fukuda Takeshi
• Ohta Takahiro

Classifications

• H01M10/48 Primary

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M50/211

  adapted for pouch cells · CPC title

• H01M50/209

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title

• H01M50/213

  adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence) · CPC title

• H01M10/34

  Gastight accumulators · CPC title