BMW I01 Product Information page 80

I01￿High-voltage￿Components
5.￿High-voltage￿Battery￿Unit
The￿high-voltage￿battery￿unit￿also￿has￿a￿low-voltage￿connection,￿as￿well￿as￿the￿high-voltage
connection.￿The￿integrated￿control￿units￿are￿supplied￿with￿voltage,￿data￿bus,￿sensor￿and￿monitoring
signals￿via￿this￿interface.￿It￿is￿incorporated￿in￿the￿refrigerant￿circuit￿for￿cooling￿the￿high-voltage￿battery.
The￿label￿on￿the￿high-voltage￿battery￿unit￿informs￿people￿working￿with￿these￿components￿about￿the
technology￿used￿and￿possible￿electrical￿and￿chemical￿dangers.
The￿electrical￿voltage￿of￿the￿high-voltage￿battery￿unit￿is￿well￿over￿60 V.￿This￿is￿why￿before￿any￿work￿at
the￿high-voltage￿battery￿unit￿the￿electrical￿safety￿rules￿must￿be￿observed:
1 Disconnect￿the￿system￿from￿the￿power￿supply
2 Provide￿a￿safeguard￿to￿prevent￿unintentional￿restarting
3 Establish￿that￿the￿system￿is￿isolated￿from￿the￿power￿supply.
The￿electrical￿lines￿(high-voltage￿and￿low-voltage),￿as￿well￿as￿the￿refrigerant￿lines,￿can￿be￿disconnected
without￿having￿to￿remove￿the￿high-voltage￿battery￿unit.
The￿high-voltage￿battery￿unit￿is￿located￿outside￿the￿passenger￿compartment.￿If￿the￿battery￿cells
generate￿excess￿pressure￿due￿to￿a￿massive￿fault,￿the￿arising￿gases￿cannot￿be￿transported￿outwards￿via
a￿vent￿pipe.￿A￿vent￿hole￿at￿the￿housing￿of￿the￿high-voltage￿battery￿unit￿is￿sufficient￿to￿allow￿pressure
compensation.
The￿high-voltage￿safety￿connector￿(Service￿Disconnect)￿is￿not￿an￿element￿of￿the￿high-voltage￿battery
unit,￿just￿like￿in￿current￿BMW￿active￿hybrid￿vehicles.￿It￿is￿located￿below￿the￿engine￿compartment￿lid.
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