3.6 Battery protection - Movicom Electric Docs

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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.

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== 3.6.1 Overcurrent protection ==

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

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[[Overcurrent protection settings>>image:1732211959984-118.png||data-xwiki-image-style-alignment="center" height="266" width="386"]]

In this section:

* Enable – a flag to enable the protection;

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* Maximum charging current, А;

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* Tolerant charging current, А;

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* Maximum discharging current, А;

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* Tolerant discharging current, А;

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* Delay before setting the error, second;

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* Delay before clearing the error, second;

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* Lock the error until the device is reset – a flag to block the error until the board is restarted.

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

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Error generation conditions:

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* 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;

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* 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.

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Conditions for removing the error:

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* 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;

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* 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.

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If there is the "Overcurrent" error, the charging and discharging relay open.

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== 3.6.2 Undervoltage protection ==

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

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

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[[Undervoltage protection settings>>image:1732212212350-294.png||data-xwiki-image-style-alignment="center" height="207" width="359"]]

In this section:

* Enable – a flag to enable the protection;

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* Minimum cell voltage, V;

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* Tolerant cell voltage, V;

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* Delay before setting the error, second;

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* Delay before clearing the error, second;

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* Lock the error until the device is reset.

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

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Error generation conditions:

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* 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.

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Conditions for removing the error:

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* 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.

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If there is the "Undervoltage" error, the discharging relay opens.

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3.6.3 Overvoltage protection

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

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[[image:1732212357972-295.png]]

In this section:

* Enable – a flag to enable the protection;

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* Maximum cell voltage, V;

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* Tolerant cell voltage, V;

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* Delay before setting the error, second;

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* Delay before clearing the error, second;

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* Switch off the discharging relay on error – a flag to open the discharging relay when the "Overvoltage" error is generated;

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* Lock the error until the device is reset.

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

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Error generation conditions:

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* 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.

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Conditions for removing the error:

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* 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.

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If there is the "Overvoltage" error, the charging relay and discharging relay opens (if the “Switch off the discharging relay on error” flag is set).

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== 3.6.4 Low temperature protection ==

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The board implements battery protection from too low temperature.

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To change the battery protection parameters from low temperature, select the menu "Protections → Low temperature protection":

In this section:

* Enable – a flag to enable the protection;

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* Minimum charging temperature, °C;

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* Tolerant charging temperature, °C;

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* Minimum discharging temperature, °C;

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* Tolerant discharging temperature, °C;

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* Delay before setting the error, second;

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* Delay before clearing the error, second;

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* Lock the error until the device is reset.

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As a result of the operation of the battery protection from low temperature, the "Low CH temperature" or “Low DCH temperature” error is generated.

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Error generation conditions:

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* the minimum temperature among all cells of the battery is less than the “Minimum charging (discharging) temperature” value for the “Delay before setting the error” time.

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Conditions for removing the error:

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* the minimum temperature among all cells of the battery is greater than the “Tolerant charging (discharging) temperature” value for the “Delay before clearing the error” time.

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If there is the "Low CH temperature" error, the charging relay opens.

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If there is the "Low DCH temperature" error, the discharging relay opens.

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== 3.6.5 High temperature protection ==

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The board implements battery protection from too high temperature.

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To change the battery protection parameters from high temperature, select the menu "Protections → High temperature protection":

In this section:

* Enable – a flag to enable the protection;

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* Maximum charging temperature, °C;

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* Tolerant charging temperature, °C;

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* Maximum discharging temperature, °C;

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* Tolerant discharging temperature, °C;

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* Delay before setting the error, second;

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* Delay before clearing the error, second;

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* Lock the error until the device is reset.

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As a result of the operation of the battery protection from high temperature, the "High CH temperature" or “High DCH temperature” error is generated.

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Error generation conditions:

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* the maximum temperature among all cells of the battery is greater than the “Maximum charging (discharging) temperature” value for the “Delay before setting the error” time.

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Conditions for removing the error:

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* the maximum temperature among all cells of the battery is less than the “Tolerant charging (discharging) temperature” value for the “Delay before clearing the error” time.

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(% class="box infomessage" %)

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If there is the "High CH temperature" error, the charging relay opens.

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If there is the "High DCH temperature" error, the discharging relay opens.

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== 3.6.6 Battery cover protection ==

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To change the protection parameters from opening the battery cover, select the menu "Protections → Battery cover protection":

In this section:

* Enable – a flag to enable the protection;

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* Delay before setting the error, second;

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* Delay before clearing the error, second;

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* Lock the error until the device is reset.

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As a result of the operation of the protection against opening the battery cover, the “Battery cover error” is generated.

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Error generation conditions:

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* there is a signal from the battery cover during the “Delay before setting the error” time.

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Conditions for removing the error:

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* no signal from the battery cover during the “Delay before clearing the error” time.

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**If there is the "Battery cover error", the “Critical error” is generated and all relays open.**

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== 3.6.7 High humidity protection ==

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The board can protect the battery from high humidity and water.

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To change the protection parameters of the battery from high humidity, select the menu "Protections → High humidity protection":

In this section:

* Enable – a flag to enable the protection;

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* Maximum humidty, RH%;

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* Tolerant humidty, RH%;

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* Delay before setting the error, second;

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* Delay before clearing the error, second;

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* Lock the error until the device is reset.

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

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Error generation conditions:

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* the measured humidity is greater than “Maximum humidity” during the “Delay before setting the error” time.

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Conditions for removing the error:

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* the measured humidity is less than the “Tolerant humidity” during the “Delay before clearing the error” time.

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If there is the "High humidity" error, no action is taken. The error is indicative.

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== 3.6.8 Water protection ==

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To change the protection parameters of the battery from water, select the menu "Protections → Water protection":

In this section:

* Enable – a flag to enable the protection;

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* Maximum (water) humidty, RH%;

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* Tolerant humidity, RH%;

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* Delay before setting the error, second;

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* Delay before clearing the error, second;

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* Lock the error until the device is reset.

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As a result of the operation of the battery protection from water, the "Water" error is generated.

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Error generation conditions:

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* the measured humidity is greater than the “Maximum (water) humidity” value during the “Delay before setting the error” time.

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Conditions for removing the error:

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* the measured humidity is less than the “Tolerant humidity” value during the “Delay before clearing the error” time.

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**If there is the “Water” error, the “Critical error” is generated and all relays open.**

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== 3.6.9 Current sensor error ==

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The board is implemented to check the current sensor connection circuits. The circuits are checked for breakage and short-circuit to the +5 V supply line.

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To change the test parameters of the current sensor connection circuits, select the menu "Protections → Current sensor error":

In this section:

* Enable – a flag to enable the protection;

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* Maximum voltage, V;

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* Minimum voltage, V;

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* Hysteresis voltage – a hysteresis value to clear the error, V;

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* Delay before setting the error, second;

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* Delay before clearing the error, second;

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* Lock the error until the device is reset.

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If there is an open or short circuit connection of a current sensor, the "Current sensor error" is generated.

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Error generation conditions:

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* the voltage in the signal line or zero level line of the current sensor is greater than the “Maximum voltage” value during the “Delay before setting the error” time;

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* the voltage in the signal line or zero level line of the current sensor is less than the “Minimum voltage” value during the “Delay before setting the error” time.

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Conditions for removing the error:

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* the voltage in the signal line or zero level line of the current sensor is in range from (Minimum voltage + Hysteresis voltage) to (Maximum voltage - Hysteresis voltage) during the “Delay before clearing the error” time.

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**If there is the “Current sensor error”, the “Critical error” is generated and all relays open.**

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== 3.6.10 Short circuit protection ==

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== 3.6.11 Contactor high temperature protection ==

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== 3.6.12 Unallowable charging protection ==