BMW 3 Owners & Service Manuals

BMW 3: Technical data

The high-voltage battery unit of the G20 PHEV is manufactured by BMW itself in Dingolfing /Germany.

The cells of the high-voltage battery unit are supplied by the Korean company Samsung SDI. The high-voltage battery unit was also developed by BMW AG itself.

The battery cells used in the high-voltage battery unit of the G20 PHEV belong to the group of lithium- ion batteries with a cell voltage of 3.69 V.

The two high-voltage battery units of the G20 PHEV are compared with the predecessor model F30 PHEV in the following tables.

Overview

Overview

For more information on the high-voltage battery unit, refer to the product information "ST1927 SP41 High-voltage Battery".

Installation location

Overview
G20 PHEV, installation location of the high-voltage battery unit

The high-voltage battery unit is installed centrally in front of the rear axle. This has the advantage that the center of gravity in the G20 PHEV was lowered, which in turn results in improved driving characteristics. All connections are accessible from the vehicle underbody.

Overview
G20 PHEV, mounting of the high-voltage battery unit

  1. 2 mounting bolts and equipotential bonding screws

The high-voltage battery unit is screwed to the vehicle body by means of eight brackets and ten mounting bolts. This way the weight and the acceleration forces occurring during the journey are supported at the body. All mounting bolts are accessible from the vehicle underbody. However, to release the screws several trim panels, the torsion bars, the exhaust system, as well as the propeller shaft need to be disassembled first.

Washers are required for four mounting bolts. This is extremely important as otherwise the body may be deformed. It is imperative that the current repair instructions are observed.

For the removal of the high-voltage battery unit, firstly all preliminary work specified in the current repair instructions (diagnosis, drawing off refrigerant, voltage disconnection, disassembling the trim panels, etc.) has to be performed. Before releasing the mounting bolts, the mobile lifting table MHT 1200 with matching fixtures must be prepared and positioned under the high-voltage battery unit.

The low-resistance connection between the housing of the high-voltage battery unit and the body is established by means of two mounting bolts and equipotential bonding screws.

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     Equipotential bonding

    The low-resistance connection between the housing of the high-voltage battery unit and ground is a crucial prerequisite for the fault-free function of the integrated isolation monitoring. This is wh

     Monitoring functions

    High-voltage interlock loop The SME control unit evaluates the signal of the high-voltage interlock loop and checks whether there is an open circuit with this circuit. In the event of an open circuit

     External features

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     Hydraulic braking

    G20 PHEV, hydraulic braking The brake booster is operated via the driver's foot operation, and the brake actuation is determined by means of the brake pedal angle sensor. Depending on the brake pedal angle sensor signal, the valves in the Dynamic Stability Control (DSC) are switched so that

     System limits

    Detection range The detection capacity of the system and the automatic braking capacity are limited. Two-wheeled vehicles for instance might not be detected. Deceleration The system does not decelerate in the following situations: For pedestrians or similarly slow-moving road users. For red tr

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