Lifespan Assessment of Li-ion Batteries Considering Time Dependent Stress Patterns

Li-ion batteries are widely used in most portable devices. Even if you use the same product, the battery lifespan varies greatly depending on the environment or usage patterns. ‘End of Life’ predictions are important for safe use and performance protection of the product, and they are typically pre-calculated through acceleration testing. However, the battery reacts differently to the same stress depending on state of health (SOH). In this paper, we propose an improved accelerated life testing (ALT) using sequential method considering time dependent stress patterns.