Power battery thermal runaway early warning method and system based on singular spectrum entropy

The invention provides a power battery thermal runaway early warning method and system based on singular spectrum entropy, and the method comprises the steps: collecting and uploading output signals of each sensor of a power battery through a vehicle end, constructing a mode matrix according to a time domain signal sequence formed by a signal transmission-in time sequence, carrying out the singular value decomposition of the mode matrix, and carrying out the early warning of the thermal runaway of the power battery. The singular values are arranged to form a singular spectrum of the signals, then singular spectrum analysis of the signals is carried out, singular spectrum entropy of a time domain signal sequence is obtained through calculation, and the singular spectrum entropy subjected to normalization processing is used for quantitatively evaluating an alarm coefficient and comparing the alarm coefficient with an alarm threshold value, so that the thermal runaway risk of the power battery is judged, and a f