Secondary battery system and deterioration state estimation method for secondary battery
US10775444B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 2019 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | Mar 28, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A secondary battery system includes a control device that estimates a reaction resistance based on the difference between a first impedance and a second impedance. Each of the first and second impedance is calculated based on first, second, and third change amount when the current value of the secondary battery is varied with corresponding period. The first change amount is a change amount of a detection value of a voltage sensor in a period in which the phase of the current value is inverted from an initial phase to an opposite phase, the second change amount is a change amount of the detection value of the voltage sensor in a period in which the phase of the current value is returned from the opposite phase to the initial phase, and the third change amount is a difference of the current value between the initial phase and the opposite phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.