Apparatus for estimating charge state of secondary battery and method therefor
US10261134B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 2015 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Apr 12, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for estimating charge state of secondary battery and method therefor are disclosed. The apparatus includes a control unit configured to estimate the state of charge of the secondary battery by repeatedly performing an algorithm of the Extended Kalman Filter by using a state equation that time-updates a state parameter including the state of charge of the secondary battery and a polarization voltage of the secondary battery, and an output equation that predicts the voltage of the secondary battery using an open circuit voltage according to the state of charge, the polarization voltage, and an internal resistance voltage generated by an internal resistance of the secondary battery, and the control unit increases a difference between state of charge noise and polarization voltage noise of the Extended Kalman Filter when the secondary battery becomes key-off state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.