BMW 3 Owners & Service Manuals

BMW 3: Introduction

Although the high-voltage battery unit of the G20 PHEV can also be partially charged by energy recovery via the electrical machine, the "normal" charging procedure takes place when the G20 PHEV is connected to the AC voltage network of the local power supply company. Energy is taken from the alternating current voltage network and fed to the direct current voltage high-voltage electrical system.

To allow this to happen, the G20 PHEV can be connected to an AC charge station or charged via the charging cable.

The charging procedure is never carried out with the maximum possible charge current. At the start, charging takes place with constant current. Switchover to constant voltage takes place towards the end. The actual charging time is increased as a result, and the service life of the battery cells is extended.

If the G20 PHEV is connected to an AC charging station, the maximum possible charging power of approximately 3.7 kW is also available (provided the AC charging station is designed for this).

System wiring diagram

System wiring diagram for AC charging with 3.7 kW

  1. Electric A/C compressor (EKK)
  2. Electrical Heating (EH)
  3. Electric motor
  4. Electric Motor Electronics (EME)
  5. Battery management electronics (SME)
  6. High-voltage battery unit
  7. Convenience charging electronics (KLE)
  8. Drive, connector fastener
  9. Drive, charging socket cover
  10. Charging socket cover sensor
  11. Locator and status lighting
  12. Charging socket at the vehicle


     General information on charging


    The "charging" procedure for an electric vehicle corresponds to "refuelling" a conventionally driven vehicle. Accordingly, in this chapter "charging" means: Charging the high-voltage battery unit d

     Overview of charging options

    The high-voltage battery unit of the G20 PHEV can generally only be charged by alternating current (AC charging) at a maximum charging power of 3.7 kW. The charging option for the high-vol


     Wireless charging tray

    Concept The wireless charging tray enables the following functions to be performed without cables: Charging the rechargeable battery of a mobile phone with Qi capability and of other mobile devices, which support the Qi standard. Charge the BMW Display key, see Owner's Manual for the vehicle.

     Regenerative braking

    The regenerative braking makes possible brake energy regeneration. The electrical machine works here as an alternator and brakes the gears via automatic transmission - propeller shaft - rear axle differential - output shafts. The high-voltage battery unit is charged with the energy

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