Life Prediction of Lithium Thionyl Chloride Battery Based on Pulse Load Test and Accelerated Degradation Test

Lithium thionyl chloride batteries are widely used in equipment that requires a long-life backup power source, and their life determines the reliability of the equipment. This paper proposes a new method for life prediction of Lithium thionyl chloride battery based on pulse load test and accelerated degradation test. Through the pulse load test, the capacity features are extracted from the voltage response of the battery, and the capacity estimator is constructed by back propagation neural network. The pulse load test method can estimate the capacity quickly and non-destructively, so the capacity degradation of the primary battery can be accurately described. On this basis, an accelerated degradation test is carried out, and the discharge angle and electrolyte fluidity are analyzed to avoid the measurement error of degradation. According to the exponential influence of time and temperature on capacity degradation, a life prediction model with satisfactory ability to approximate measured data is established.