Cylindrical secondary battery
US11502337B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 2018 |
| Grant date | Nov 15, 2022 |
| Priority date | — |
| Expiry date | Jun 4, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cylindrical secondary battery includes a bottomed cylindrical battery case having an opening, an electrode group, an electrolyte solution, and a sealing member blocking the opening of the battery case. The electrode group includes a positive electrode, a negative electrode, and a separator. The negative electrode includes a negative electrode current collector and a negative electrode mix layer placed on at least one principal surface of the negative electrode current collector. The negative electrode mix layer includes a non-facing region not facing the positive electrode mix layer. The density of the negative electrode mix layer is 1.25 g/cm3 to 1.43 g/cm3, the ratio of the entire length of the non-facing region to the entire length of the negative electrode mix layer is 0.09 or more, and the inside diameter of a hollow section of the electrode group is 2.0 mm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.