The difference between constant current (CC) and constant voltage (CV) stages in charging lies in how the charge is delivered to the battery:
Constant Current Stage (CC Mode)
- Method: The charging current is maintained at a constant level by adjusting the output voltage of the DC power source.
- Purpose: Prevents overcurrent conditions, ensuring the battery charges safely and efficiently when it is deeply discharged.
- Operation: A high current is initially supplied to the battery until a certain voltage threshold is reached.
Constant Voltage Stage (CV Mode)
- Method: The voltage applied to the battery terminals is maintained constant, regardless of the charging current.
- Purpose: Prevents overcharging by allowing the current to decrease as the battery reaches full capacity, thus maintaining the preset voltage.
- Operation: The charger allows the full current to flow until the battery reaches its pre-set voltage, at which point the current decreases gradually.
In practical terms, most charging processes start with a constant current stage to fill the battery quickly, then transition to a constant voltage stage to ensure safe and complete charging.
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