Lim - BMW I01 Product Information

I01￿High-voltage￿Components
6.￿Charging￿the￿High-voltage￿Battery
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The￿charging￿socket￿in￿the￿vehicle￿for￿combo￿charging￿includes￿the￿sockets￿for￿AC￿charging￿and￿the
socket￿for￿DC￿charging.￿The￿advantage￿of￿this￿charging￿socket￿configuration￿is￿that￿the￿customer￿can
use￿both￿AC￿charging￿stations￿and￿DC￿charging￿stations￿for￿charging￿the￿high-voltage￿battery.
During￿DC￿charging￿an￿electric￿arc￿may￿form￿by￿disconnecting￿the￿charging￿plug￿during￿the￿charging
procedure.￿To￿prevent￿this￿the￿charging￿plug￿is￿locked￿electromechanically￿during￿the￿charging
procedure.￿This￿way￿a￿possible￿dangerous￿situation￿for￿the￿user￿is￿avoided.￿An￿ergonomic￿handle￿at
the￿charging￿plug￿and￿low￿connection￿and￿disconnection￿forces￿enable￿comfortable￿operation￿of￿the
connector￿using￿only￿one￿hand.
Simultaneous￿charging￿via￿AC￿and￿DC￿is￿not￿possible.
6.4.3.￿LIM
The￿main￿tasks￿of￿the￿LIM￿are￿already￿described￿previously￿in￿this￿chapter.￿Only￿the￿additional
functions￿and￿tasks￿of￿the￿LIM￿for￿combo￿charging￿are￿described￿here.￿A￿new￿tasks￿of￿the￿LIM￿is,￿for
example,￿the￿activation￿of￿the￿switch￿contactors￿in￿the￿KLE￿for￿DC￿charging.
Communication
Also￿for￿combo￿charging￿the￿LIM￿assumes￿the￿communication￿between￿the￿vehicle￿and￿the￿charging
station.￿The￿communication￿between￿the￿vehicle￿and￿the￿charging￿station￿is￿enabled￿and￿the￿charging
procedure￿is￿controlled￿via￿the￿pilot￿and￿proximity￿line.
Using￿the￿proximity￿line￿the￿correct￿connection￿of￿the￿charging￿cable￿at￿the￿vehicle￿is￿identified￿and￿the
maximum￿current￿carrying￿capacity￿of￿the￿charging￿cable￿is￿measured￿by￿the￿LIM￿using￿the￿resistor￿in
the￿charging￿cable.
The￿high-voltage￿power￿management￿in￿the￿EME￿sends￿a￿request￿to￿charge￿the￿high-voltage￿battery
to￿the￿LIM￿via￿the￿PT-CAN.￿The￿LIM￿then￿starts￿the￿communication￿with￿the￿charging￿station￿via￿the
pilot￿line.￿The￿information￿about￿charging￿requirement,￿charging￿range￿and￿accuracy￿is￿exchanged.
Only￿after￿successful￿communication￿start￿is￿the￿charging￿voltage￿applied￿to￿the￿phase￿L1￿or￿to￿the
DC￿positive￿wire￿and￿ground￿cable.￿This￿also￿gives￿further￿protection￿for￿customers￿and￿Service
employees￿against￿the￿dangers￿of￿electricity.
The￿LIM￿sends￿a￿signal￿for￿"Enable￿charging"￿for￿AC￿charging￿via￿the￿separate￿line￿to￿EME￿and￿KLE.
Activation￿of￿the￿switch￿contactors￿in￿the￿KLE
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Explanation
Connection￿for￿proximity￿line
Connection￿for￿phase￿L1
Connection￿for￿protective￿earth￿(PE)
Connection￿for￿neutral￿conductor￿(N)
Connection￿for￿pilot￿line
Protective￿cap￿for￿AC￿charging￿socket
Protective￿cap￿for￿DC￿charging￿socket
Connection￿for￿DC￿ground￿cable
Connection￿for￿DC￿positive￿wire