Internal resistance refers to the total resistance generated by the battery during its operation, including the hindrance to the transmission of electrons and ions by all components inside the battery. Its unit is ohm (Ω), and it is one of the key parameters that affect battery performance (such as power output, heat generation, and efficiency).
The impact of internal resistance:
Energy efficiency reduction: During the battery discharge process, a portion of the energy is consumed in the form of heat due to internal resistance.
Power output limitation: High internal resistance reduces the maximum output current, limiting the instantaneous power performance.
Increased temperature rise and risk of thermal runaway: The higher the internal resistance, the greater the current, and the more heat generated.
Battery life assessment indicator: Internal resistance increases with cycling and aging and can be used to measure the health status (SOH).
