Nissan Leaf. Manual — part 433
COMPONENT PARTS
EVB-15
< SYSTEM DESCRIPTION >
D
E
F
G
H
I
J
K
L
M
A
B
EVB
N
O
P
Front of battery pack
Back of battery pack
: Vehicle front
No.
Component
Function
Li-ion battery
Service plug
Front module stack RH
Battery junction box
EVB-20, "Battery Junction Box"
Battery current sensor
EVB-19, "Battery Current Sensor"
Front module stack LH
Li-ion battery controller
EVB-16, "Li-ion Battery Controller"
Rear module stack
Battery temperature sensor 1
EVB-19, "Battery Temperature Sensor"
Battery temperature sensor 4
EVB-19, "Battery Temperature Sensor"
Battery temperature sensor 2
EVB-19, "Battery Temperature Sensor"
: Vehicle front
No.
Component
Function
Li-ion battery heater RH 1
EVB-18, "Li-ion Battery Heater"
Li-ion battery heater RH 2
EVB-18, "Li-ion Battery Heater"
Li-ion battery heater RR 2
EVB-18, "Li-ion Battery Heater"
Li-ion battery heater LH 1
EVB-18, "Li-ion Battery Heater"
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EVB-16
< SYSTEM DESCRIPTION >
COMPONENT PARTS
Li-ion Battery
INFOID:0000000010121029
• A Li-ion battery with flat construction is placed under floor.
• The battery pack is equipped with necessary devices, such as Li-
ion battery controller, battery junction box, and service plug in addi-
tion to a battery storing electricity.
• Four cells are integrated into a single module. The Li-ion battery consists of 48 modules placed in series.
Li-ion Battery Controller
INFOID:0000000010121030
• Li-ion battery controller (LBC) is included in the battery pack and
installed on the left surface of the rear module stack.
• The LBC is the core of battery control. Li-ion battery controller detects the voltage and current of the assem-
bled battery, the temperature of each module, and the voltage of each cell to judge state of charge. LBC also
calculates possible input/output values, meter indication values, and chargeable values, and send this data
to VCM (Vehicle control module). VCM controls the vehicle, according to the battery state.
Main Role of Li-ion Battery Controller
1. Li-ion battery state check
• State of charge
• Possible output value
• Possible input value
• Temperature
2. Optimization of Li-ion battery voltage
Li-ion battery heater LH 2
EVB-18, "Li-ion Battery Heater"
Heater relay unit
Li-ion battery heater RR 1
EVB-18, "Li-ion Battery Heater"
No.
Component
Function
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COMPONENT PARTS
EVB-17
< SYSTEM DESCRIPTION >
D
E
F
G
H
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M
A
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EVB
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3. Prevention of overvoltage and overcurrent
4. Prevention of overheat
5. Detection of decrease in insulation resistance of high-voltage circuit
6. Detection of a fit of high voltage harness connector and service plug
Module
INFOID:0000000010121031
• Four laminated cells are integrated into one module.
• The Li-ion battery is equipped with 48 modules.
• There are two kinds of modules, according to the location of posi-
tive and negative terminals.
MODULE INTERNAL CIRCUIT
A module consists of two parallel-connected cells placed in series.
The Li-ion battery has 48 modules placed in series in total. Ninety-six
parallel-connected cell pairs are connected in series.
NOTE:
Cell voltage displayed on the data monitor of CONSULT means the
potential difference between the upstream and the downstream of
the parallel circuit.
MODULE LAYOUT
NOTE:
The highest potential is module (MD) 1 and the lowest is module (MD) 48.
CELL
Positive terminal
: Red
Negative terminal
: Black
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JPCIA0197GB
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EVB-18
< SYSTEM DESCRIPTION >
COMPONENT PARTS
These are thin laminated cells with excellent cooling performance.
The Features of Laminated Cell
• Large surface area with excellent cooling performance reduces heat load to the battery and improves bat-
tery life.
• Light and thin structure increases flexibility in layout.
Heater Relay Unit
INFOID:0000000010121032
• The heater relay unit is installed in the battery pack (under the ser-
vice plug).
• When receiving a relay control signal from LBC (Li-ion battery con-
troller), the heater relay unit turns ON the built-in relay and sup-
plies high-voltage power to each Li-ion battery heater.
Li-ion Battery Heater
INFOID:0000000010121033
• Li-ion battery heater is installed in the battery pack.
• High voltage power is supplied from the heater relay unit.
• Each Li-ion battery heater is connected in parallel.
FRONT LI-ION BATTERY HEATER
• Two front Li-ion battery heaters are installed to each front module
stack.
REAR LI-ION BATTERY HEATER
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