I01�High-voltage�Components
5.�High-voltage�Battery�Unit
86
Cooling�system�of�the�high-voltage�battery
The�high-voltage�battery�unit�in�the�I01�is�cooled�directly�by�refrigerant.�The�refrigerant�circuit�of�the
air�conditioning�system�is�therefore�made�up�of�two�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�by�applying�voltage.�In�this�way�refrigerant�can�flow�to�the�high-voltage�battery,
expanding,�evaporating�and�cooling�in�the�process.�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�and�by�the�EDME.
Entire�heating/cooling�system�of�the�high-voltage�battery
Index
Explanation
1
Capacitor�in�the�refrigerant�circuit
2
Electric�fan,�refrigerant�circuit�for�passenger�compartment
3
EKK
4
Dryer�flask
5
High-voltage�battery�unit
6
Combined�expansion�and�shut-off�valve�in�the�refrigerant�circuit�(for�cooling
high-voltage�battery)
