Page 21 - i-MeIV Product Information

Lithium-ion battery

3-1-3 Battery unit: Structure
DC 330V battery unit is equipped with Service plug, Current sensor, Electric leak sensor as a unit.
CMU [Cell Monitor Unit] is set on the each battery module, and each of CMU has voltage sensor and
temperature sensor.

[Battery module]
i-MiEV has 10 pieces of 8 cells type and 2 pieces of 4 cell
type of battery module.
Each modules have CMU [Cell Monitor Unit] which inte-
grates voltage sensor temperature sensor. and etc.

Battery module[ 8 cells type] Battery module[ 4 cells type]

[Service Plug]
Service plug Magnet Service plug is located on the top of the battery pack unit and it can be accessed
from underneath of front passenger seat.
It reduces the battery voltage mechanically by removing it.

Service plug has a magnet at the lever area and it states the condition of service
plug to the EV-ECU.
ON : The service plug is fixed properly and the lock lever stays lock position.
To the battery pack OFF : The lock lever of service plug is released.

[Current sensor for DC 330V Battery]
Current sensor
For The current sensor for DC 330V battery is integrated in the battery pack and it
DC 330V Battery measures the electric current flow at high voltage circuit by using hole element.
There is two type of sensor ,High for wider range measurement and Low for
detailed measurement.
The measured value of flux is transferred into voltage and send to BMU.

Electric leak sensor
For [Electric leak sensor for DC 330V Battery ]
DC 330V Battery The electric leak sensor is integrated in the battery pack and it will send the
signals to BMU if there is leakage.
It also has a self check function by creating the ideal electrical leak.

3-1-4 Contactors
DC 330V battery has integrated contactors which control on/off of the battery output and they are located at the circuit
to the inverter.
There are three contactors, Main contactor P, Main contactor N and Contactor for Charging, and these are controlled
by EV-ECU.
MCU activate the discharging circuit when the power switch is OFF, and releasing the accumulated voltage at
Smoothing condenser.

MCU DC 330V Battery
Main contactor

Contactor for Charging
Inverter

Main contactor

Smoothing
Condenser Discharging
Circuit EV-ECU
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