Power battery pack contactor self-checking method and system based on temperature fluctuation function

The invention relates to the technical field of testing, measuring or monitoring the electrical condition of a storage battery or a battery, and discloses a power battery pack contactor self-checking method and system based on a temperature fluctuation function. The method comprises the following steps: determining a circuit path of the contactor, acquiring voltage, current and temperature in the contactor, switching the circuits in the contactor, recording the voltage, current and temperature of one electrified circuit, and repeating the operation until all the electrified circuits in the contactor are detected once. Calculating a temperature fluctuation value when each circuit is electrified by adopting a temperature toggle function; according to the method, the circuits in the contactor are singly switched, so that each circuit used for transmitting electric energy in the contactor is electrified, and the temperature fluctuation condition of electrification of a single electrified circuit is calculated by