Method for determining the internal impedance of a battery cell in a string of serially connected battery cells
US6922058B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 2003 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | Jan 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/396
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining the internal impedance of each battery cell within a system including at least one parallel string of serially connected battery cells without disconnecting the battery cells from the system, which initially makes measurements of two battery cells within each string to calculate the internal impedance of each of those two battery cells and to calculate a common impedance multiplier term for the rest of the battery cells in each string. The remaining battery cells in each string are individually measured and the common impedance multiplier term for that string is used to account for measured current which comes from the Thevenin equivalent voltage source of the rest of the system, in addition to current drawn from the battery cell being measured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.