BMW 3: Electrical connections
The high-voltage battery unit also has a signal connection, as well as the high-voltage connection.
The high-voltage battery unit is integrated in the refrigerant circuit in order for it to be cooled.
Connections of the SP41 high-voltage battery
- Venting unit
- Signal connector
- Connections for refrigerant lines
- High-voltage connection
The electrical lines (high-voltage and signal connection), as well as the refrigerant lines, can be disconnected without having to remove the high-voltage battery unit.
Low-voltage connection
There is a signal connection on the left side of the high-voltage battery unit of the G20 PHEV. The control units integrated in the high-voltage battery unit are supplied with voltage, data bus, sensor and monitoring signals via this interface.
The signal connection has the following lines:
- Voltage supply of the SME control unit with terminal 30 and terminal 31
- Terminal 30C (crash signal) for voltage supply of the electromechanical switch contactors
- Wake-up line from the Body Domain Controller (BDC)
- Input and output of the signal line for the high-voltage interlock loop
- Output (+12 V and ground) for the actuation of the combined expansion and shutoff valve as part of the refrigerant circuit
- K-CAN5.
High-voltage connection
There is a 2-pin flat high-voltage connection at the high-voltage battery unit with which the high- voltage battery unit is connected to the EME.
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Cooling system
To increase the service life of the high-voltage battery unit and obtain the
greatest possible power, it
is operated in a defined temperature range. The high-voltage battery unit is
essentially oper
Overview
G20 PHEV, system overview of climate control - Installation locations
Combined expansion and shutoff valve at the evaporator
Combined expansion and shutoff valve at the high-voltage battery u
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
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Front passenger side glove
compartment
Safety information
Warning
Folded open, the glove compartment protrudes
in the car's interior. Objects in the glove compartment
can be thrown into the car's interior
while driving, for instance in the event of an accident
or during braking and evasive maneuvers.
There is a risk of injury. Always c
Power electronics for activation of the electrical machine
The power electronics for the activation of the electrical machine are mainly
made up of the
bidirectional DC/AC converter. It is a pulse converter with a 2-pin DC voltage
connection and a 3-phase
AC voltage connection. This DC/AC converter can work as an inverter and conduct
electrical energy
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