Self-discharge refers to the phenomenon where the charge (capacity) of a battery naturally decreases over time due to internal chemical or physical processes when no external load is connected.
Influencing Factors
Temperature: The self-discharge rate approximately doubles for every 10°C increase.
Battery Aging: The SEI (Solid Electrolyte Interface) film’s damage or thickening will exacerbate self-discharge.
State of Charge (SOC): At high voltage states, side reactions are more active, resulting in more significant self-discharge.
Material Purity: Impurities (such as Fe, Cu) can cause electrochemical corrosion, enhancing self-discharge.
