CC:When first charging a pack, they produce a fixed constant current and allow the pack voltage to rise as it is charged.
CV: When the pack is nearly full, and its voltage reaches the constant voltage, the charger maintains that voltage and the pack current decays exponentially as the pack gets a finishing charge until the pack is full.
But we know from the previous introduction that this cannot provide any protection for the battery at all, but if it is not used with other control strategies, then this is equivalent to directly exposing the battery to an unprotected environment, which is more dangerous. The suitable current value will provide a balance between charging performance and battery safety.
Compared with lead-acid batteries, lithium ions batteries is more suitable for CCCV charging method. In addition, Li-ion batteries require a much longer CC mode.The CC-CV charging method is more efficient than either the CC or CV methods individually.