BMS

Battery management system: the car's electronics that decide how much power the battery accepts at each moment.

Explained in

EV charging fundamentals · Stop 04Why doesn't electricity flow immediately?Authorisation is approved, yet the display shows Preparing and power later falls on its own. Safety checks, the handshake and the charging curve explained.

The battery management system requests power based on cell temperature and state of charge, and lowers it as the battery fills. The falling number around minute 20 is the cells being protected.

From “From the grid to the cells”, stop 04

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  1. State of chargeHow full the battery is right now, in percent; not to be confused with the state of health.
  2. Load managementShares a site's grid connection between the cars charging at the same time.
  3. ContactorAn electrically operated switch for high currents; in a DC charger it connects the output to the car only after both have checked the connection and matched the voltage.