Battery current ripple scanning frequency acquisition method

The invention discloses a battery current ripple scanning frequency acquisition method. The method comprises the following steps: step 1, connecting a waveform generator with a battery to be tested; cAP1 initialization is carried out on the CAP1; step 2, sampling the voltage and current of the battery to be detected, and reducing the sampled voltage and current data at the same time; step 3, removing direct current to enable the alternating voltage sampling to be unsaturated, and sending the alternating voltage sampling to a CAP port of the DSP; 4, judging whether CEVT1 is set or not, if yes, executing the step 5, and if not, ending; step 5, calculating a capture interval to obtain a two-time capture interval; step 6, calculating to obtain a waveform period; step 7, calculating waveform frequency; and step 8, performing median filtering to obtain a waveform frequency after filtering processing. In conclusion, the frequency of the rapid frequency sweeping of the battery cell is obtained, the frequency sweeping