Lithium ion secondary battery
US8277969B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2010 |
| Grant date | Oct 2, 2012 |
| Priority date | — |
| Expiry date | May 24, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lithium ion secondary battery 1 includes a spirally wound electrode assembly 20 and a cylindrical battery container 10. The spirally wound electrode assembly 20 includes a negative electrode 21, a positive electrode 22 and a separator 23. The negative electrode 21 includes negative-electrode active material layers 21b and 21c containing a negative-electrode active material capable of forming an alloy with lithium. The lithium ion secondary battery 1 includes an urging part 20a. The urging part 20a is disposed in the center of and in contact with the spirally wound electrode assembly 20. The urging part 20a is contractible in diameter. The urging part 20a is configured to urge the spirally wound electrode assembly 20 radially outward at least when contracting in diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.