Secondary battery system and method of estimating deterioration state of secondary battery system
US10862174B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 2, 2019 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Mar 20, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T90/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A secondary battery system includes a secondary battery, an electric circuit, and an electronic control unit. The electronic control unit is configured to execute first calculation control, second calculation control, and estimation control when a predetermined condition is satisfied. The first calculation control is control for calculating a first impedance of the secondary battery based on a voltage value of the secondary battery at a time when a current value of the secondary battery is fluctuated on a first cycle. The second calculation control is control for calculating a second impedance of the secondary battery based on the voltage value of the secondary battery at a time when the current value of the secondary battery is fluctuated on a second cycle. The estimation control is control for estimating a reaction resistance of the secondary battery from a difference between the first impedance and the second impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.