3.6 Battery protection

The BMS Main 2.x board continuously monitors the state of the cells, BMS Logic boards, the external environment and, when detecting abnormalities, protects the battery and system components from damage.

3.6.1 Overcurrent protection

To change the current protection of the battery, select the menu "Protections → Overcurrent protection":

In this section:

• Enable – a flag to enable the protection;
• Maximum charging current, А;
• Tolerant charging current, А;
• Maximum discharging current, А;
• Tolerant discharging current, А;
• Delay before setting the error, second;
• Delay before clearing the error, second;
• Lock the error until the device is reset – a flag to block the error until the board is restarted.

As a result of operation of the current protection, the "Overcurrent" error is generated.

Error generation conditions:

• the current is positive (charging), and its modulo value is greater than the “Maximum charging current” value for the “Delay before setting the error” time;
• the current is negative (discharging), and its modulo value is greater than the “Maximum discharging current” value for the “Delay before setting the error” time.

Conditions for removing the error:

• the current is positive (charging) or zero, and its modulo value is less than the “Tolerant charging current” value for the “Delay before clearing the error” time;
• the current is negative (discharging), and its modulo value is less than the “Tolerant discharging current” value for the “Delay before clearing the error” time.

3.6.2 Undervoltage protection

The board implements battery protection from too low or too high voltage on the cells.

To change the battery protection parameters from low voltage on the cells, select the menu "Protections → Undervoltage protection":

 In this section:

• Enable – a flag to enable the protection;
• Minimum cell voltage, V;
• Tolerant cell voltage, V;
• Delay before setting the error, second;
• Delay before clearing the error, second;
• Lock the error until the device is reset.

As a result of the operation of battery protection from low voltage, the "Undervoltage" error is generated.

Error generation conditions:

• the minimum voltage among all cells of the battery is less than the “Minimum cell voltage” value for the “Delay before setting the error” time.

Conditions for removing the error:

• the minimum voltage among all cells of the battery is greater than the “Tolerant cell voltage” value for the “Delay before clearing the error” time.

3.6.3 Overvoltage protection

To change the battery protection parameters from high voltage on the cells, select the menu "Protections → Overvoltage protection":

In this section:

• Enable – a flag to enable the protection;
• Maximum cell voltage, V;
• Tolerant cell voltage, V;
• Delay before setting the error, second;
• Delay before clearing the error, second;
• Switch off the discharging relay on error – a flag to open the discharging relay when the "Overvoltage" error is generated;
• Lock the error until the device is reset.

As a result of the operation of the battery protection from high voltage, the "Overvoltage" error is generated.

Error generation conditions:

• the maximum voltage among all cells of the battery is greater than the “Maximum cell voltage” value for the “Delay before setting the error” time.

Conditions for removing the error:

• the maximum voltage among all cells of the battery is less than the “Tolerant cell voltage” value for the “Delay before clearing the error” time.

3.6.4 Low temperature protection

3.6.5 High temperature protection

3.6.6 Battery cover protection

3.6.7 High humidity protection 

3.6.8  Water protection
Current sensor error
Short circuit protection
Contactor high temperature protection
Unallowable charging protection
Stuck contactor protection
Contactor feedback check
Charging contactor cycles protection
Discharging contactor cycles protection
Temperature sensor error
Logic high temperature protection
Logic offline protection
Cell count protection
Logic count protection
WDT protection
Insulation monitoring
Critical error parameters
General error parameters
Low SOC signal
High charging current signal
Heater control
Heater (AUX) control
Cooler control
Fault simulation