Bms - Battery Management System - exide EV640 Manual De Usuario

3. BMS – Battery Management System
The battery is equipped with an advanced integrated electronic Battery Management System, BMS. The BMS monitors the state
of the battery by measuring voltages, temperatures and the electrical current in and out of the battery. The BMS performs balancing
of the battery cells inside the battery and operates the heater (for applicable products). Battery models with Bluetooth allow the
user to receive information of the battery status from the BMS.
BMS has a self-learning and SOC calibration function. Calibration needs to charge the battery to 100% SOC
SOC on the mobile Application "Exide M&L" is calculated by the BMS. The BMS has self-power consumption, when battery is left
in storage, due to energy consumption from electronics, this calculation may become inaccurate. Make a full charge to the battery
to get accurate data.
3.1 BMS integrated protection
To protect or minimize damage to the battery from abuse situations there are built-in protection limits for voltage, temperature and
current. Systematic or intentional triggering of the BMS protection must be avoided and may cause permanent damage to the
battery.
When BMS low voltage protection is triggered, battery must be "waken up" by the use of a proper charger (w/o voltage sensing),
and charged to 100% to calibrate BMS and get accurate SoC calculation.
WARNING! If the battery is used outside the permitted ranges the BMS will enter protection mode and trigger an electronic dis-
connect of the battery. Disconnection by the BMS results in sudden loss of battery power and may lead to total loss of function
for connected equipment.
3.1.1 BMS protection levels
For correct operation refer to recommendations and ranges (voltage, current and temperature) for charge and discharge in
section 2.
BMS protection modes
BMS protection modes are listed below including trigger, release and possible or required action to restore battery to normal state.
Triggered protection will be communicated via Bluetooth for batteries with this function.
Protection mode
Over charge / Over voltage
Over discharge /
Under voltage**
Over current charging
Over current discharging
Over temperature
Under temperature***
*Battery voltages are indicative only. Protection is triggered and released by cell voltages
**Note that Bluetooth connection will be disabled while over discharge protection trigger is active
***Batteries with heater will prohibit charge if temperature is too low (<0°C) and utilize charging current to heat up the battery. Charging of the
battery will commence automatically once battery is sufficiently heated
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Trigger
Any cell >3.75 V
Battery* >15.0 V (12 V)
Battery* >30.0/45.0 V (24/36 V)
Any cell < 2.50 V
Battery* <10.0 (12 V)
Battery* <20.0/30.0 V (24/36 V)
Exceeding charging current
ranges, see levels for specific
battery model in section 2.4
Exceeding discharging current
ranges, see levels for specific
battery model in section 2.3
Temperature above allowed
range, see levels for specific
battery model in section 2.3
and 2.4
Temperature below allowed
range, see levels for specific
battery model in section 2.3
and 2.4
Release
Cell(s) <3.60 V
Battery* <14.4 V (12 V)
Battery* <28.8/43.2 V (24/36 V)
Cell(s) >2.80 V
Battery* >11.2 V (12 V)
Battery* >22.4/33.6 V (24/36 V)
Automatic release,
time-out up to 1 minute.
Automatic release,
time-out up to 1 minute.
Temperature within range
(~5 °C margin)
Temperature within range
(~5 °C margin)
Action to restore
Allow to rest or apply
discharge to battery
Apply charge to battery.
Allow to rest or apply
discharge to battery
Allow to rest or apply charge
to battery
Allow battery to cool down
Allow battery to heat up. Apply
charge to activate heater
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