Charging Time: Why 80% Is Not Half the Problem
The EV marketing spec says “0 to 80% in 22 minutes.” It rarely says how long 80 to 100% takes. The omission is deliberate — and it reveals something fundamental about how lithium-ion cells actually work. The CC-CV Profile and Why the Transition Matters Lithium-ion charging follows a two-phase profile, not because someone decided it was a good idea, but because cell physics demands it. Constant Current (CC) phase: You push current in at a fixed rate. The cell voltage rises as SoC increases. This phase is efficient — you’re putting energy into the cell at the maximum rate the chemistry allows without exceeding the voltage limit or driving electrochemical side reactions. ...