Method and apparatus for detecting defects of rechargeable battery
US12210066B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2022 |
| Grant date | Jan 28, 2025 |
| Priority date | — |
| Expiry date | Jan 29, 2043 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Detecting a defect in a rechargeable battery includes measuring an output signal by applying an input signal to the battery while modulating frequency, calculating an AC impedance according to the frequency and the output signal, Nyquist plotting the AC impedance and building an equivalent circuit model based on the plot, calculating a product of a charge transfer resistance and an electric double layer capacitance in the model as a time constant or calculating a slope of a straight line appearing in a low-frequency region in the plot, comparing the time constant with a predetermined time constant or comparing an absolute value of the calculated slope of the straight line with a predetermined slope absolute value, and determining the battery is defective when the time constant is less than the predetermined time constant or when the absolute value of the calculated slope is smaller than the predetermined slope absolute value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.