Nissan Leaf. Manual - part 433

COMPONENT PARTS

EVB-15

< SYSTEM DESCRIPTION >

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Front of battery pack

Back of battery pack

: Vehicle front

No.

Component

Function

Li-ion battery

EVB-16, "Li-ion Battery"

Service plug

EVB-20, "Service Plug"

Front module stack RH

EVB-17, "Module"

Battery junction box

EVB-20, "Battery Junction Box"

Battery current sensor

EVB-19, "Battery Current Sensor"

Front module stack LH

EVB-17, "Module"

Li-ion battery controller

EVB-16, "Li-ion Battery Controller"

Rear module stack

EVB-17, "Module"

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

EVB-18, "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 >

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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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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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