An open circuit refers to a state where the battery is not connected to any load and no current is flowing. In this state, the voltage across the battery terminals is called open circuit voltage (OCV, Open Circuit Voltage), which is a key indicator reflecting the electrochemical potential energy inside the battery.
Application significance
OCV is used to estimate SOC (State of Charge), especially after a battery has been left to rest for a period of time and its voltage tends to stabilize;
It is an important parameter for battery performance modeling, state estimation, and health assessment;
In battery experiments and diagnostics, the open-circuit state is used to obtain a standardized reference voltage.
