Nissan Leaf. Manual — part 435
SYSTEM
EVB-23
< SYSTEM DESCRIPTION >
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DESCRIPTION
The Li-ion battery controller (LBC) monitors the status of the inside of the Li-ion battery at all times and sends
information, such as the charging status of Li-ion battery and possible power, to VCM (vehicle control module)
via EV system CAN communication.
The Li-ion battery controller performs control as per the following.
• Monitors the battery state and transfers chargeable/dischargeable power to VCM to prevent an error, such
as overvoltage, over discharge or excessive temperature rise in the battery.
• Detects an error (overvoltage, over discharge, overcurrent, or excessive temperature rise) immediately at
the time of error occurrence and requests VCM to disconnect the system main relay to interrupt the dis-
charge/charge line.
• Maintains the optimum battery state constantly with a cell capacity adjustment function to prevent a reduc-
tion in charging/discharging capacity caused by cell capacity variations.
• Detects the connector fit state with the function to detect the fit of the high voltage harness connector and
transfers the detected state to VCM so that the vehicle does not start with an unsteady state.
• Detects the insulation resistance state with the function to detect the insulation resistance between high and
low voltage and transfers the detected state to VCM so that the vehicle does not start with an unusual state.
• Estimates a battery charge state and low battery state, based on the data obtained with the battery state
detection function, and reflects on the battery capacity meter.
BATTERY PROTECTION
The Li-ion battery has a voltage range capable of charge/discharge. If charged/discharged exceeding the
range, excessive low capacity or malfunction may be caused. To prevent this, the Li-ion battery controller
detects voltage of each cell and requests the control of charging/discharging energy to VCM so that the cell
voltage stays within the voltage range.
Received unit
Signal name
VCM
EV system CAN
High voltage discharge permit signal
Li-ion battery main relay cut request signal
Li-ion battery connector interlock signal
Li-ion battery voltage signal
Li-ion battery current signal
Li-ion battery chargeable power signal
Li-ion battery dischargeable power signal
Li-ion battery chargeable completion signal
Li-ion battery available charge signal
Li-ion battery capacity signal
Li-ion battery gradual capacity loss signal
Insulation resistance signal
Control item
Control
Operating condition
Overvoltage/overcurrent protec-
tion
Charging energy control
Gradual control of charging energy as the cell voltage ap-
proaches the upper limit of the voltage capable of charging.
System main relay cut
Cell voltage exceeds the voltage judged as overvoltage and
maintains the voltage for more than the specified time.
Over discharge protection
Discharging energy control
Gradual control of discharging energy as the cell voltage ap-
proaches the lower limit of the voltage capable of discharging.
System main relay cut
Cell voltage exceeds the voltage judged as over discharge and
maintains the voltage for more than the specified time.
Excessive temperature rise pro-
tection
Charging/discharging energy
control
Gradual control of charging/discharging energy as Li-ion bat-
tery temperature approaches the upper limit of the temperature
capable of use.
System main relay cut
Li-ion battery temperature exceeds the temperature judged as
excessive temperature rise and maintains the temperature for
more than the specified time.
EVB-24
< SYSTEM DESCRIPTION >
SYSTEM
HOW TO ADJUST CELL CAPACITY
During cell capacity adjustment, the capacity of each cell is estimated based on the no-load voltage when the
system starts, and the capacities are adjusted so that they are all at the target level. The voltage of each cell is
detected inside the Li-ion battery controller. The bypass switches are then turned ON to discharge the cells
that have excess capacity. In this way, capacity adjustment by the Li-ion battery controller allows the capacity
of all cells to be fully utilized.
INSULATION RESISTANCE LOSS DETECTION FUNCTION
The insulation resistance detection circuit mounted inside the Li-ion battery controller measures the insulation
resistance of each high voltage part and sends the measurement results to VCM via EV system CAN commu-
nication.
VCM judges abnormal insulation resistance in each high voltage part, based on the received insulation resis-
tance value.
LI-ION BATTERY HEATER CONTROL SYSTEM
JPCIA0094GB
JSCIA0732GB
SYSTEM
EVB-25
< SYSTEM DESCRIPTION >
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LI-ION BATTERY HEATER CONTROL SYSTEM : System Description
INFOID:0000000010121040
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL ITEM
Input Signal Item
Output Signal Item
DESCRIPTION
• When the temperature decreases [approximately
−20°C (−4°F)] extremely in the battery pack, the Li-ion bat-
tery heater control system automatically activates the Li-ion battery heater to warm the inside of the battery
pack for protecting Li-ion battery from freezing and preventing the decline in battery output. In addition, when
the temperature in the battery pack is restored [approximately
−10°C (14°F)], the Li-ion battery heater stops.
• The Li-ion battery controller (LBC) detects a temperature in the battery pack, according to a signal transmit-
ted from the battery temperature sensor installed to the battery pack and judges the activation of the Li-ion
battery heater.
• When the relay built in the heater relay unit turns ON, high voltage power is supplied to each Li-ion battery
heater.
• LBC detects the ON/OFF status of the relay built in to heater relay unit.
• Even when the power switch is OFF, VCM periodically activates LBC to protect Li-ion battery from freezing.
JSCIA0793GB
Transmit unit
Signal name
VCM
EV system CAN communication
Keep SOC request signal
Receive unit
Signal name
VCM
EV system CAN communication
Next start time signal
EVB-26
< SYSTEM DESCRIPTION >
SYSTEM
• When the temperature in Li-ion battery pack is low with no necessity of Li-ion battery heater operation, LBC
estimates the time that Li-ion battery may freeze and transmits a next start time signal to VCM via EV sys-
tem CAN communication to prepare for starting the Li-ion battery heater next time.
• When receiving a next start time signal via EV system CAN communication, VCM transmits a start request
signal (CHG-IGN) to LBC after a lapse of the set time. When receiving a start request signal (CHG-IGN),
LBC activates the Li-ion battery heater.
When EVSE is connected (normal charge)
• When the temperature in the battery pack is low outside the timer charge set time, VCM transmits a keep
SOC request signal to LBC via EV system CAN communication. In this case Li-ion battery is not charged,
and only Li-ion battery heater is activated.
• When timer charge starts at the set time, Li-ion batter is charged, and the Li-ion battery heater is activated.
When EVSE is not connected (normal charge)
• When the charge level of the Li-ion battery is low during the Li-ion battery heater operation, LBC stops the
Li-ion battery heater operation even if the temperature in the battery pack is insufficient.
JSCIA0430ZZ
JSCIA0431ZZ
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