Fast method for calibrated self-discharge measurement of lithium
Here, we introduce a rapid potentiostatic method for directly measuring the self-discharge current, providing precise self-discharge currents within a few hours with a high
A powerful tool is presented to directly measure battery self-discharge. Precise self-discharge currents are measured with a high resolution of 0.25 µA. Experimental investigation of the method is done based on temperature and SoC. Arrhenius analysis of self-discharge provides chemical insights to the LiB cells.
The self-discharge current of the batteries from the same production batch should have the similar self-discharge current. By applying Arbin SDC measurement and monitoring to the batteries, the bad battery with larger self-discharge current can be easily identified.
Varying self-discharge rates between cells in a battery pack can result in voltage imbalances between the cells and a shorter battery pack life (Zheng et al., 2020). Self-discharge rates vary depending on the cell chemistry, capacity, electrode geometry, electrolyte formulation, impurities, and temperature.
Traditional SDC Measurement is estimating the self-discharge current by monitoring the battery's open circuit voltage drop after a long time. Then find the capacity change corresponding to the OCV change, calculate the estimated SDC by capacity change divides time.
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