BMW I01 Product Information page 176

I01￿High-voltage￿Components
11.￿Cooling￿the￿Electrical￿Machine
Components
• Terminal￿15￿switched￿on,￿driving￿readiness
• Terminal￿15￿switched￿on,￿no￿driving￿readiness
• High-voltage￿battery￿is￿charged.
The￿power￿electronics￿switching￿of￿the￿electrical￿machine￿electronics￿are￿already￿working￿when
terminal￿15￿is￿switched￿on.￿Both￿the￿high-voltage￿electrical￿system￿(EKK￿and￿electric￿heating)￿and￿the
12 V￿vehicle￿electrical￿system￿are￿supplied￿with￿energy￿by￿the￿DC/DC￿converter.￿If￿due￿to￿the￿arising
heat￿a￿cooling￿requirement￿is￿identified,￿the￿coolant￿pump￿is￿switched￿on,￿and￿if￿required￿also￿the
electric￿fan.
When￿terminal￿15￿is￿switched￿the￿coolant￿pump￿and￿electric￿fan￿can￿be￿switched￿on￿automatically.
For￿work￿with￿an￿open￿engine￿compartment￿lid￿or￿at￿the￿cooling￿module￿it￿is￿imperative￿terminal￿15￿is
switched￿off.
While￿the￿high-voltage￿battery￿is￿being￿charged,￿the￿power￿electronics￿in￿the￿electrical￿machine
electronics￿and￿in￿the￿convenience￿charging￿electronics￿are￿working.￿Due￿to￿the￿high￿electrical
power,￿which￿is￿generated￿in￿the￿electrical￿machine￿electronics￿and￿the￿convenience￿charging
electronics,￿heat￿also￿develops.￿This￿must￿be￿dissipated￿using￿the￿cooling￿circuit￿described￿here.
For￿this￿reason,￿the￿electric￿coolant￿pump￿and￿the￿electric￿fan￿are￿also￿switched￿on￿during￿charging
with￿a￿correspondingly￿high￿temperature￿in￿the￿electrical￿machine￿electronics￿and￿in￿the￿convenience
charging￿electronics.
The￿coolant￿pump￿and￿the￿electric￿fan￿can￿be￿switched￿on￿automatically￿when￿charging￿the
high-voltage￿battery.￿The￿high-voltage￿battery￿cannot￿be￿charged￿when￿working￿with￿the￿engine
compartment￿lid￿open￿or￿at￿the￿cooling￿module.
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