Battery degradation refers to the gradual decline in the ability of a battery to store and deliver energy. This inevitable process can result in reduced energy capacity, range, power, and overall efficiency of your device or vehicle. The battery pack in an all-electric vehicle is designed to last the lifetime of the vehicle.
Capacity measurement is one of the most common methods to assess battery degradation. By comparing the current capacity of a battery to its original capacity, the extent of degradation can be determined. Capacity measurements are typically conducted through full charge and discharge cycles, monitoring the energy stored and released by the battery.
Voltage measurement is another widely used technique to monitor battery degradation. As a battery degrades, its voltage profile changes, providing insights into its health. By comparing the voltage under load or during charging to the expected voltage for a healthy battery, the extent of degradation can be estimated.
Degradation stage detection and life prediction are important for battery health management and safe reuse. This study first proposes a method of detecting whether a battery has entered a rapid degradation stage without accessing historical operating data.
The chemical composition of a battery greatly affects its degradation. Different types of batteries, such as lithium-ion, lead-acid, or nickel-based batteries, have varying degradation characteristics. Each battery chemistry has its unique set of advantages and disadvantages when it comes to degradation.
Nonetheless, precise SOH prediction is challenging as the battery SOH decay process is highly nonlinear and strongly dependent on the accumulation of complex by-products inside the battery, with the degree of nonlinearity inconsistent with external battery excitation changes.