An Optimized charging method for lithium-ion batteries based on strain

Abstract Lithium-ion batteries (LIBs) are widely used in multiple fields due to their high efficiency and environmental protection characteristics. However, during rapid charging, the internal strain of the battery may lead to performance degradation and shortened lifespan. In the study, the LIBs are charged at different charge rates, and their strain value is measured at the same time. It is found that the strain is closely related to the charge rate. Based on this, a 2C-1C CCCV charging strategy is proposed, which can ensure the charging speed while effectively suppressing the strain increase, reducing the stress of the battery, and prolonging the battery life. This discovery provides a new theoretical basis for rapid charging and helps promote the development of new energy technologies.