Abstract
The invention provides a method for evaluating the health state and residual life of a power battery of an electric vehicle. The method comprises the steps: constructing a capacity increment curve ofa power battery in a current state through a discrete capacity increment analysis method for a processed data segment; determining the change of the charging capacity by analyzing the change of the capacity increment sum corresponding to the voltage value of the overlapped part of the abscissa of the discrete capacity increment curve, so that the evaluation of the SOH of the power battery of the electric vehicle is completed; and stripping a long-range change trend part and a short-range fluctuation part of the SOH curve of the battery by utilizing an empirical mode decomposition method, and synthesizing the two parts of prediction results to obtain an SOH prediction result of the power battery in the future stage, namely residual life RUL prediction. The method is suitable for health state evaluation of electric vehicles of various types and various charging strategies, is high in compatibility and clear in physical significance, avoids blindly using various intelligent algorithms forblack box modeling, and is considerable in processing rate and memory occupation condition.
Original language | English |
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Patent number | CN112526351 |
IPC | G01R 31/ 382 A I |
Priority date | 16/12/2020 |
Publication status | Published - 19 Mar 2021 |
MoE publication type | H1 Granted patent |