Multi-fault diagnosis method and system for battery packs based on corrected sample entropy
US11959973B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2020 |
| Grant date | Apr 16, 2024 |
| Priority date | — |
| Expiry date | Apr 1, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3835
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multi-fault diagnosis method has the following steps: measuring cell voltages of a battery pack to be diagnosed; constructing a cell voltage sequence according to measured cell voltages of the battery pack to be diagnosed, and calculating a sample entropy value of the cell voltage sequence; setting a correction coefficient for representing voltage fluctuation information, and correcting the sample entropy value through the correction coefficient to obtain a corrected sample entropy value; and judging and outputting a fault type of the battery pack to be diagnosed according to a numerical value change of the corrected sample entropy value. Faults of cells can be accurately diagnosed without a model, sample entropy values under different faults can be distinguished by setting the correction coefficient, the intuitiveness and efficiency of fault detection are improved, and the fault type and time of the lithium-ion cells can be quickly, accurately and stably diagnosed and predicted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.