Stress-based comprehensive method and system for evaluating state of health of power battery, medium and device

A stress-based comprehensive method for evaluating state of health of a power battery, comprising:

• acquiring a stress and a capacity of a charging and discharging cycle of a battery;
• according to a correlation between the acquired stress and capacity, calculating a state of charge of the battery and a state of health of the battery defined based on the stress;
• evaluating the state of charge of the battery by taking the correlation between the stress and the state of charge of the battery into account;
• acquiring a current capacity and an internal resistance of the battery and predicting a current remaining useful life of the battery;
• according to the acquired current remaining useful life of the battery, calculating a current capacity-based state of health of the battery and an internal resistance-based state of health of the battery respectively;
• and
• calculating a weighted sum of the obtained state of health of the battery defined based on the stress, the capacity-based state of health of the battery and the internal resistance-based state of health of the battery, and obtaining a comprehensively evaluated state of health of the battery by combining the weighted sum with the evaluated state of charge of the battery.