Life prediction of lithium thionyl chloride batteries based on the pulse load test and accelerated degradation test. Qual Reliab Eng Int. 2022; 00 1– 15. https://doi.org/10.1002/qre.3144, , , .
Lithium thionyl chloride batteries are widely used in military equipment, electronic communications, and smart meters due to their long life. In smart meters used for electricity metering, lithium thionyl chloride batteries are used as a backup power source in the event of a power outage. According to the data of the State Grid Corporation of China, about 600 million smart meters have been used by 2018 and battery failures account for a high proportion. Therefore, accurate battery life prediction is required due to the enormous economic losses caused by battery failures. This paper proposes a pulse load test method to solve the problem that the capacity of such non-rechargeable batteries cannot be obtained accurately and non-destructively. In addition, this paper introduces a new phenomenon that the capacity is affected by the battery discharge angle. The experimental design was improved by considering the influence of electrolyte fluidity on capacity so that the serious degradation measurement error in the temperature accelerated degradation test was avoided. Based on the analysis of the capacity degradation mechanism, the life prediction model was developed. The results of this study will help us to have an insight into the capacity loss and degradation mechanism of lithium thionyl chloride batteries, and provide assistance for accelerated degradation test design, life model development, and maintenance strategy development to reduce the economic loss caused by battery failure.More Details