BMW 3 Owners & Service Manuals

BMW 3: Overview

Cooling system
G20 PHEV, system overview of climate control - Installation locations

  1. Combined expansion and shutoff valve at the evaporator
  2. Combined expansion and shutoff valve at the high-voltage battery unit
  3. High-voltage battery unit
  4. Refrigerant lines to high-voltage battery unit
  5. Evaporator, passenger compartment
  6. Electric A/C compressor (EKK)
  7. Coolant-based air conditioning condenser (coolant-refrigerant-heat exchanger)

Cooling system of the high-voltage battery unit

The high-voltage battery unit is cooled directly using R1234yf . The refrigerant circuit of the air conditioning consists of 2 parallel branches. One for cooling the passenger compartment and one for cooling the high-voltage battery unit. For each branch there is a combined expansion and shutoff valve in order to be able to control the cooling functions independent of each other. The battery management electronics can activate and open the combined expansion and shutoff valve at the high- voltage battery unit by applying voltage. In this way refrigerant can flow to the high-voltage battery unit. The cooling of the passenger compartment is also effected in a condition-based manner. The combined expansion and shutoff valve upstream from the evaporator can also be activated electrically by the EME. The amount of flowing refrigerant is adjusted thermally (depending on the refrigerant temperature) via the expansion valves.

Cooling system
Refrigerant circuit with high-voltage battery unit (simplified illustration)

  1. Receiver dryer
  2. Coolant-based air conditioning condenser (coolant-refrigerant-heat exchanger)
  3. Electric A/C compressor (EKK)
  4. Blower for passenger compartment
  5. Combined expansion and shutoff valve, passenger compartment
  6. Evaporator, passenger compartment
  7. High-voltage battery unit
  8. Combined expansion and shutoff valve, high-voltage battery unit
  9. Heat exchanger

As a result of the pressure drop after the expansion valve, the refrigerant in the lines and coolant ducts of the high-voltage battery unit evaporates. In the process the refrigerant absorbs heat energy from the cell modules or battery cells and cools them. The evaporated refrigerant then leaves the high-voltage battery unit, is compressed by the electric A/C compressor and liquefied in the coolant/refrigerant heat exchanger. Although energy is required from the high-voltage electrical system for this procedure, it is of utmost importance. Only this way can a long service life and a high degree of efficiency of the battery cells be guaranteed.

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     Functions

    The cooling system has 2 operating conditions, which result from its function: Cooling OFF Cooling ON Cooling OFF operating condition The "Cooling OFF" operating condition is active when the cell

     Charging the High-voltage Battery Unit

     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 

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     Overview

    General information The navigation system can determine the precise position of the vehicle with the aid of satellites, and can reliably guide you to every entered destination. Navigation data is stored in the vehicle and can be updated from a USB storage device. Certain services of the navigation

     Intended use

    Heed the following when using the vehicle: Owner's Manual. Information on the vehicle. Do not remove stickers. Technical vehicle data. The traffic, speed, and safety laws where the vehicle is driven. Vehicle documents and statutory documents. Warranty Your vehicle is technically configured

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