Changes for page 3.3 Control

Last modified by Admin on 2025/04/09 12:14

From 1.2 to 1.3 From 9.1 to 9.2

From version 1.3

edited by Admin
on 2024/12/04 14:34

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To version 9.1

edited by Admin
on 2024/12/24 16:05

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@@ -1,1 +1,1 @@
--drafts.bms-main-3.3\. Settings.WebHome
++Battery management systems.BMS Main 3.3\. Configuration.WebHome

Content

@@ -1,10 +1,14 @@
--1.
--11.
--111. Common settings
++(% data-numbered-headings-start="3" style="--numbered-headings-start: 2;font-size: 0px;color: rgba(0, 0, 0, 0.0);margin-bottom: 0px; margin-top: 0px;" %)
++= Settings =
++(% data-numbered-headings-start="3" style="--numbered-headings-start: 2;font-size: 0px;color: rgba(0, 0, 0, 0.0);margin-bottom: 0px; margin-top: 0px;" %)
++== Control ==
++
++=== Common settings ===
++
  To change the common BMS settings, select the "Control → Common settings" section:
--[[image:1733322611547-671.png]]
++[[image:1735054851946-552.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="105" width="800"]]
  In this section:
@@ -12,8 +12,10 @@
  * Cell resistance – nominal (maximum) internal resistance of the cells, Ohm;
  * Relax time (after charging) – a relaxation time after charging, second;
  * Relax time (atfer discharging) – a relaxation time after discharging, second;
--* Number of cycles – a number of charge-discharge cycles;
--* Reset parameters – a command to reset cells state of charge, capacity, and resistance.
++* Reset parameters – a command to reset cells state of charge, capacity, and resistance;
++* Method of calculating the battery voltage:
++** Summation of cell voltages – the overall voltage is calculated as on sum of all cells in the battery;
++** Using voltage before contactors – the overall voltage is estimated as voltage before contactors measured by BMS.
  The values “Capacity”, “Resistance”, “Cycles” are used to calculate the SOC of cells and the battery.
@@ -27,11 +27,8 @@
  The “Reset parameters” command is used for starting-up and adjustment of the battery.
++=== SOC estimation ===
--1.
--11.
--111. SOC estimation
--
  The BMS Main 3 device calculates the state of charge of the battery (SOC) using two algorithms:
  * by open circuit voltage;
@@ -41,8 +41,9 @@
  To change the estimation algorithm for calculating the battery SOC, select the "Control → SOC estimation → Algorithm" section:
--[[image:1733322611549-423.png]]
++[[image:1735056107942-306.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="141" width="800"]]
++
  The following estimation algorithms supported:
  * Voltage – by open circuit voltage;
@@ -60,13 +60,14 @@
  To change the algorithm for calculating the Final SOC, select the "Control → SOC estimation → Final SOC" section:
--[[image:1733322611551-852.png]]
++[[image:1733322611551-852.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="148" width="800"]]
  The following calculation methods are supported (“Final SOC”):
  * Minimal SOC – the battery SOC is assumed to be the minimum SOC among the cells;
  * Average SOC – the battery SOC is taken equal to the arithmetic average of the cell SOC;
--* Min-Max SOC – the battery SOC is taken based on the minimum and maximum SOC of the cells (recommended method).
++* Min-Max SOC – the battery SOC is taken based on the minimum and maximum SOC of the cells as follows:
++* Max-Min SOC – the battery SOC is taken based on the minimum and maximum SOC of the cells.
  Other parameters:
@@ -80,15 +80,13 @@
  * Coulomb counting correction (temperature) – the dependence of battery capacity on temperature;
  * Coulomb counting correction (cycles) – the dependence of battery capacity on the number of charge-discharge cycles.
--1.
--11.
--111. SOC correction
++=== SOC correction ===
--The BMS Main 3 device can recalculate the battery SOC after long-term storage or after long-term working in the case when the battery was not charged fully or discharged totally. Recalculation is done based on the tabular dependency Uocv = Uocv (SOC, t) (see section** **2.3.2).
++The BMS Main 3 device can recalculate the battery SOC after long-term storage or after long-term working in the case when the battery was not charged fully or discharged totally. Recalculation is done based on the tabular dependency Uocv = Uocv (SOC, t) (see [[SOC estimation>>doc:||anchor="HSOCestimation"]]).
  To configure parameters for periodically correcting the battery state of charge, select the "Control → SOC correction" section:
--[[image:1733322624656-766.png]]
++[[image:1733322624656-766.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="121" width="800"]]
  In this section:
@@ -99,11 +99,8 @@
  * Ignore the linear zone – a flag to ignore linear SOC zone while correction (recommended to be unset);
  * Last correction timestamp – time when last correction was made.
++=== Resistance estimation ===
--1.
--11.
--111. Resistance estimation
--
  Calculation of the resistance of cells is carried out in two ways. The first method is used when the battery passes from a relaxation state to a charge or discharge state, wherein the cell resistance value
  R = (U-U,,ocv,,) / I,,stable,,,
@@ -122,7 +122,7 @@
  To change parameters of the algorithm for calculating the cell resistance, select the "Control → Resistance estimation" section:
--[[image:1733322624659-473.png]]
++[[image:1733322624659-473.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="108" width="800"]]
  In this section:
@@ -132,16 +132,13 @@
  * Minimum SOC – minimum cell SOC value for resistance calculation;
  * Maximum SOC – maximum cell SOC value for resistance calculation.
--The calculated resistance is accepted by the system as valid (and therefore updated) if its value is in the range from Resistance/2 to “Maximum resistance factor” × Resistance, where "Resistance" is the nominal resistance of the cell (see section 2.3.1). If the calculated resistance value is greater than the value (Maximum resistance factor × Resistance), the updated resistance value will be equal to the value (Maximum resistance factor × Resistance).
++The calculated resistance is accepted by the system as valid (and therefore updated) if its value is in the range from Resistance/2 to “Maximum resistance factor” × Resistance, where "Resistance" is the nominal resistance of the cell (see [[Common settings>>doc:||anchor="HCommonsettings"]]). If the calculated resistance value is greater than the value (Maximum resistance factor × Resistance), the updated resistance value will be equal to the value (Maximum resistance factor × Resistance).
++=== Low SOC (signal) ===
--1.
--11.
--111. Low SOC (signal)
--
  To change the parameters of the generation a signal about low battery level, select the "Control → Low SOC (signal)" section:
--[[image:1733322624660-513.png]]
++[[image:1733322624660-513.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="116" width="800"]]
  In this section:
@@ -162,14 +162,11 @@
  The "Low SOC signal" is indicative and can be output to a discrete output or a power switch.
++=== High charging current (signal) ===
--1.
--11.
--111. High charging current (signal)
--
  To change the parameters of the generation high-current signal, select the "Control → High charging current (signal)" section:
--[[image:1733322624661-915.png]]
++[[image:1733322624661-915.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="107" width="800"]]
  In this section:
@@ -190,11 +190,8 @@
  The "High charging current" signal is indicative and can be output to a discrete output or a power switch.
++=== Charge map ===
--1.
--11.
--111. Charge map
--
  The BMS Main 3 device calculates the maximum allowable charge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.
  Calculated current values are sent to a charger or an intellectual load over the CAN bus. External devices based on received data provide correct battery operation.
@@ -201,7 +201,7 @@
  To configure parameters for determining the charge current limit, select the "Control → Charge map" section:
--[[image:1733322637793-171.png]]
++[[image:1733322637793-171.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="177" width="800"]]
  In this section:
@@ -221,11 +221,8 @@
  Charging current limit = Maximum charging current × Kcs × Kcc × Kcv × Kct
++=== Discharge map ===
--1.
--11.
--111. Discharge map
--
  The BMS Main 3 device calculates the maximum allowable discharge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.
  Calculated current values are sent to a charger or an intellectual load over the CAN bus.
@@ -232,7 +232,7 @@
  To configure parameters for determining the discharge current limit, select the "Control → Discharge map" section:
--[[image:1733322637795-310.png]]
++[[image:1733322637795-310.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="178" width="800"]]
  In this section:
@@ -252,16 +252,13 @@
  Discharging current limit = Maximum discharging current × Kds × Kdc × Kdv × Kdt
++=== Charge map (PEAK & CONTINUOUS) ===
--1.
--11.
--111. Charge map (PEAK & CONTINUOUS)
--
  The BMS Main 3 has an alternative algorithm for the maximum allowed charging current based on peak and continuous battery operating modes.
  To configure parameters for determining the charge current limit, select the "Control → Charge map (PEAK & CONTINUOUS)" section:
--[[image:1733322637796-187.png]]
++[[image:1733322637796-187.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="145" width="800"]]
  In this section:
@@ -276,7 +276,7 @@
  The maximum charging current value equals to the peak or continuous current according to the following diagram:
--[[image:1733322717451-608.png]]
++[[image:1733322717451-608.png||data-xwiki-image-style-alignment="center"]]
  I,,peak,, = Maximum PEAK charge current × K,,cp,,
@@ -283,15 +283,13 @@
  I,,continuous,, = Maximum CONTINUOUS charge current × K,,cc,,
--1.
--11.
--111. Discharge map (PEAK & CONTINUOUS)
++=== Discharge map (PEAK & CONTINUOUS) ===
  The BMS Main 3 has an alternative algorithm for the maximum allowed discharging current based on peak and continuous battery operating modes.
  To configure parameters for determining the discharge current limit, select the "Control → Discharge map (PEAK & CONTINUOUS)" section:
--[[image:1733322735595-661.png]]
++[[image:1733322735595-661.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="145" width="800"]]
  In this section:
@@ -306,17 +306,14 @@
  The maximum discharging current value equals to the peak or continuous current according to following diagram:
--[[image:1733322753429-968.png]]
++[[image:1733322753429-968.png||data-xwiki-image-style-alignment="center"]]
  I,,peak,, = Maximum PEAK discharge current × K,,dp,,
  I,,continuous,, = Maximum CONTINUOUS discharge current × K,,dc,,
++=== Charge ===
--1.
--11.
--111. Charge
--
  There are two contactors that serve charging the battery: a charging contactor and an allow charging contactor. With the help of the allow charging contactor, the BMS commands the charger to start or stop charging.
  The device supports three charge control algorithms:
@@ -367,7 +367,7 @@
  To change the parameters of the battery charge control algorithm, select the "Control → Charge" section:
--[[image:1733322798914-813.png]]
++[[image:1733322798914-813.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="327" width="800"]]
  In this section:
@@ -390,9 +390,7 @@
  Note – The allow charging contactor closes under two independent conditions: 1) the voltage on the cells reaches the “Voltage to reset the “Ready to charge"” level and 2) the "Delay before recharging" time has passed since the opening of the allow charging contactor.
--1.
--11.
--111. Discharge
++=== Discharge ===
  The device controls the discharging contactor to connect battery to the load.
@@ -444,10 +444,8 @@
  To change the parameters of the battery discharge control algorithm, select the "Control → Discharge" section:
--[[image:file:///C:/Users/INASIB~~1/AppData/Local/Temp/msohtmlclip1/01/clip_image001.png||alt="A screenshot of a computer
++[[image:1733323750262-841.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="360" width="800"]]
--Description automatically generated"]]
--
  In this section:
  * Enable – a flag to activate the discharge control;
@@ -468,26 +468,20 @@
  * Voltage to clear the “Ready to discharge” – a threshold voltage level on the cell, V; if the voltage of any cell is below this level, the “Ready to discharge” signal is cleared;
  * Voltage to reset the “Ready to discharge” – a tolerant voltage level on the cell, V; if all cells voltages are above the tolerant level, the “Ready to discharge” signal is set;
++=== Charge/Discharge ===
--1.
--11.
--111. Charge/Discharge
--
  The BMS Main 3 device can control the charging/discharging contactor, which combines algorithms of charging and discharging contactor. It behaves as a charging contactor when “Charge request” or “Charger connected” is set, otherwise – as a discharging contactor.
  The charging/discharging contactor control is configured in the “Control – Charge/Discharge” section:
--[[image:1733322827919-875.png]]
++[[image:1733322827919-875.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="85" width="800"]]
  In this section:
  * Enable – a flag to enable the charge/discharge controller.
++=== Discharge (AUX) ===
--1.
--11.
--111. Discharge (AUX)
--
  The BMS Main 3 device can control the power supply of external equipment using the auxiliary (AUX) discharging contactor. An example of external equipment can be an inverter that converts DC to AC to power a service laptop and other devices.
  The power supply circuit of the external equipment using the auxiliary (AUX) discharging contactor is independent of the battery load circuit. The closing and opening of the auxiliary (AUX) discharging contactor is performed according to its program.
@@ -500,7 +500,7 @@
  To change the parameters of the powering of external equipment, select the "Control → Discharge (AUX)" section:
--[[image:1733322827920-878.png]]
++[[image:1733322827920-878.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="130" width="800"]]
  In this section:
@@ -513,4 +513,283 @@
  * Maximum voltage – maximum battery voltage, V;
  * Switch off the discharging (AUX) contactor on errors – the auxiliary (AUX) discharging contactor opens if the following errors occur: Undervoltage, Overcurrent, High temperature (DCH), Short circuit, Critical error.
--
++=== Main contactor ===
++
++The BMS Main 3 device controls the main contactor. The main contactor is usually placed in the common (minus) battery line for opening the charge and discharge circuits in case of sealing of the charging or discharging contactors.
++
++The Main contactor algorithm supports the following modes:
++
++* Always on;
++* Automatic;
++* On demand.
++
++In “Always on” mode main contactor closes if all the following is true:
++
++* Charging contactor is open;
++* Discharging contactor is open;
++* There are no errors from the list below:
++** Overcurrent;
++** Undervoltage;
++** Overvoltage;
++** High temperature (CH);
++** High temperature (DCH);
++** Unallowable charging;
++** Critical error.
++
++In “Always on” mode main contactor opens if all the following is true:
++
++* Charging contactor is open;
++* Discharging contactor is open;
++* There is an error from the list below:
++** Overcurrent;
++** Undervoltage;
++** Overvoltage;
++** High temperature (CH);
++** High temperature (DCH);
++** Unallowable charging;
++** Critical error.
++
++In “Automatic” mode, the main contactor closes by internal charging and discharging algorithms at the same time with Precharging, Charging and Discharging contactors.
++
++In “On demand” mode, the main contactor closes by external the “Close Main contactor” request.
++
++To change the parameters of the main contactor, select the "Control → Main contactor" section:
++
++[[image:1733322872744-536.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="105" width="800"]]
++
++In this section:
++
++* Enable – a flag to enable the main contactor control;
++* Algorithm – main contactor control algorithm:
++** Always on – contactor is always closed;
++** Automatic – contactor closes by internal charge and discharge algorithms;
++** On demand – contactor is closed by an external request;
++* Time to keep the contactor closed before closing the others – a time for other contactors to be open after the main contactor is closed;
++* Delay before opening the contactor – a time which is used to detect conditions for opening the contactor, s;
++* Keep the contactor open until the device is restarted – a flag for keeping the main contactor open until the system is reset.
++
++=== Cell balancing ===
++
++Balancing makes the voltage of all cells equal to the minimum cell voltage.
++
++The following balancing rules are supported:
++
++* when the battery is charging (current I > 0) and time after until the battery is relaxed;
++* when the battery is charging (current I > 0) or when the battery is in a state of relaxation;
++* always (regardless of battery state).
++
++A balancing resistor is connected to the cell if the following conditions are simultaneously met:
++
++* the voltage on the cell is higher than the balancing start voltage;
++* the difference between the voltage on the cell and the minimum voltage among the battery cells is greater than the balancing start threshold.
++
++A balancing resistor is disconnected from the cell if any of the following conditions are met:
++
++* the voltage on the cell is less than the balancing start voltage;
++* the difference between the voltage on the cell and the minimum voltage among the battery cells is less than the balancing stop threshold.
++
++If the “High logic temperature” occurs, then the balancing of the cells connected to the overheated BMS Logic device will not be performed.
++
++The BMS Main 3 can enable the cell balancing by the external “Balancing request” signal. Balancing process will be started to cells which the voltage is higher than the balancing start voltage and the difference between the cell voltage and the minimum voltage among all the cells is greater than the balancing stop threshold.
++
++To change the cell balancing parameters, select the "Control → Cell balancing" section:
++
++[[image:1733322883460-118.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="114" width="800"]]
++
++In this section:
++
++* Enable – a flag to enable cell balancing;
++* Balancing rule:
++** Balance on charge – balancing is performed while and after the charging (in the “Charge ON” and “Charge OFF” states);
++** Balance on charge or relaxed - balancing is performed while and after the charging and in the relaxed state (in “Charge ON”, “Charge OFF”, “Relaxed (after charging)” and “Relaxed (after discharging)” states);
++** Balance always – balancing is always performed regardless the battery state;
++
++[[image:1733322883462-975.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="74" width="600"]]
++
++* Minimum cell voltage to start balancing, V;
++* Voltage deviation to start balancing;
++* Voltage deviation to stop balancing;
++* Command to discharge all cells – a flag to force the balancing of all cells.
++
++=== Series balancing ===
++
++The BMS Main 3 device supports work with two independent (galvanically unrelated) cell series. To monitor the status of two series, two current sensors are used. A series of cells must be equivalent: they must have the same number of cells and the same capacity.
++
++Since the series of cells can operate at different loads, they must be balanced. For this, the BMS Main 3 provides two signals to power switches: “Balancing series 1” and “Balancing series 2”, as well as a combined algorithm that considers both the voltage of each series and the charge that these series gave load. The “Balancing series 1” and “Balancing series 2” signals are used to connect high-power balancing resistors in parallel with cell series 1 and 2.
++
++When charging the battery, balancing is performed based on the voltage of the series. A balancing resistor is connected to the cell series if:
++
++* the series voltage is higher than the start balancing voltage;
++* the difference between the voltage of a series of cells and the minimum voltage among the battery series is greater than the balancing threshold.
++
++When the battery is discharging (work on load), balancing is turned on if one of the series gives the load a charge (Ah), which is more by the amount Qthr of the charge given off by another series.
++
++To change the series balancing parameters, select the "Control → Series balancing" section:
++
++[[image:1733322892811-410.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="126" width="800"]]
++
++In this section:
++
++* Enable – a flag to enable series balancing;
++* Number of Logics in a series;
++* Minimum series voltage to start balancing, V;
++* Balancing threshold, V;
++* Coulomb threshold – the difference of the charges Qthr, given by a series of cells, above which balancing to be started, Ah;
++* Period – a period to reset of charge counters for each series (to avoid accumulation of error), second;
++* Do not sum series voltages – a flag to disable the summing of series voltages.3
++
++=== Power down ===
++
++The BMS Main 3 device can shut down itself if the battery voltage is low or the battery is idle for a long time.
++
++Shutting down the battery system is performed according to the following conditions:
++
++* the battery voltage is below the minimum level;
++* the “Charger connected” signal is cleared for 60 seconds.
++
++The BMS Main 3 device also shuts down the battery if it stays in the “Charging OFF”, “Discharging OFF”, “Relaxed (after charging)” or “Relaxed (after discharging)” for the configured time.
++
++To change the parameters of the power down control, select the "Control → Power down" section:
++
++[[image:1733322892813-562.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="103" width="800"]]
++
++In this section:
++
++* Minimum voltage to power down – a minimum voltage level of the battery below which the BMS commands to shut down the battery, V;
++* Idle time to power down – a time of battery inactivity after which the battery is shut down, minute;
++* Wait the "Power up/down request" is cleared (on startup) – a flag to enable delay for clearing the “Power up/down request” signal while starting the BMS.
++* Power down if KEYRUN and CHARGE_ON are cleared – a flag to power down the device if KEYRUN and CHARGE_ON signals are cleared;
++* Delay before setting the internal power down signal – a delay before turning off the device power when removing KEYRUN and CHARGE_ON or receiving the “Power down request” command, ms.
++
++=== Heater ===
++
++To change the parameters of the heater control algorithm, select the "Control → Heater" section:
++
++[[image:1733322901923-144.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="108" width="800"]]
++
++In this section:
++
++* Enable – a flag to enable the heater control;
++* Minimum cell temperature, °C;
++* Tolerant cell temperature, °C;
++* Delay before starting the heater, millisecond;
++* Delay before stopping the heater, millisecond;
++* Switch off the heater on errors (Undervoltage, Overcurrent, High temperature, Short circuit or Critical error).
++
++As a result of operating the heating algorithm, the “Heater” signal is generated.
++
++Conditions for signal generation:
++
++* the minimum temperature among all cells of the battery is less than the “Minimum cell temperature” value during the “Delay before starting the heater” time.
++
++Conditions for clearing the signal:
++
++* the minimum temperature among all cells of the battery is greater than the “Tolerant cell temperature” value during the “Delay before stopping the heater” time.
++
++If there is the "Heater" signal, the heater contactor closes and/or a signal is output to the corresponding digital output.
++
++=== Cooler ===
++
++To change the parameters of the cooler control algorithm, select the "Control → Cooler" section:
++
++[[image:1733322901924-962.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="107" width="800"]]
++
++In this section:
++
++* Enable – a flag to enable the cooler control;
++* Maximum cell temperature, °C;
++* Tolerant cell temperature, °C;
++* Delay before starting the cooler, millisecond;
++* Delay before stopping the cooler, millisecond;
++* Switch off the cooler contactor on errors (Undervoltage, Overcurrent, Low temperature, Short circuit or Critical error).
++
++As a result of operating the cooling algorithm, the "Cooler" signal is generated.
++
++Conditions for signal generation:
++
++* the maximum temperature among all cells of the battery is greater than the “Maximum cell temperature” value during the “Delay before starting the cooler” time.
++
++Conditions for clearing the signal:
++
++* the maximum temperature among all cells of the battery is less than the “Tolerant cell temperature” value during the “Delay before stopping the cooler” time.
++
++If there is the "Cooler" signal, the cooler contactor closes and/or a signal is output to the corresponding digital output.
++
++=== High voltage ===
++
++The BMS Main 3 device has an ability to measure high voltages before and after contactors.
++
++To change the parameters of high voltage fault, select the "Control → High voltage" section:
++
++[[image:1733322914683-203.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="87" width="800"]]
++
++In this section:
++
++* Enable – a flag to enable High voltage control;
++* Delay before clearing the High voltage fault, second;
++* Lock the High voltage fault.
++
++The BMS Main 3 implements a self-diagnostics of high-voltage measurement lines. If measurement line breaks or high-voltage polarity is wrong, “High voltage fault” is generated.
++
++**If there is the “High voltage fault”, the “Critical error” is generated and all contactors open.**
++
++=== Cell analysis ===
++
++The battery discharge characteristic – the dependence Uocv = Uocv(DOD) – is used to determine the tabular dependence Uocv = Uocv(SOC, t°C), which is necessary for calculating the battery charge level.
++
++The BMS Main 3 device can automatically determine the battery discharge characteristic.
++
++Before starting the process of determining the discharge characteristic, it is necessary to prepare a BMS:
++
++1. Charge the battery.
++1. Connect a resistive load to the discharging contactor, which will provide a discharge current of 0.5C (where C is the cell capacitance).
++
++To configure parameters for determining the discharge characteristic of the battery, select the "Control → Cell analysis" section:
++
++[[image:1733322914685-558.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="107" width="800"]]
++
++In this section:
++
++* Enable – a flag to enable cell analysis;
++* Discharge step, Ah;
++* Delta voltage – a maximum allowable voltage drop for the cell, V;
++* Logic index, Cell index – a position of the analyzed cell;
++* Analyse the most discharged cell – a flag to analyse of the least charged cell (in this case, the values “Logic index” and “Cell index” are ignored).
++
++Discharge step should be set equal to
++
++Discharge step= С/21,
++
++where C is the cell capacity.
++
++The discharge characteristic will be constructed for the given cell (its position is determined by the fields “Logic index” and “Cell index”).
++
++The algorithm for determining the discharge characteristic of the battery will be started if the “Enable” flag is set. From this moment, the control of the discharge contactor is performed by this algorithm.
++
++Algorithm steps:
++
++1. DOD = 0.
++1. Opening the discharging contactor.
++1. Waiting for the relaxation of the battery.
++1. Measuring Uocv = U.
++1. Saving the point of the discharge characteristic (Q, U,,OCV,,).
++1. Closing of the discharging contactor. DOD,,1,, = DOD + Discharge step, U,,1,, = U
++1. If DOD = DOD,,1,, or U < (U,,1,, – Delta voltage), then go to step 2.
++1. If the "Undervoltage" error is detected, then the end of the algorithm.
++
++During the operation of the algorithm, a file with the name "CELLANALYSIS.TXT" in the CSV format will be created on the SD card.
++
++File structure:
++
++|**Time**|**DOD**|**Logic**|**Cell**|**OCV**|**Resistance**
++|**10.11.2017 12:28:34**|0.0|1|1|4.180|0.080000
++|**...**|...| |…|...|...
++
++Parameter names:
++
++* Time – date and time;
++* DOD – depth of discharge, Ah;
++* Logic - position of the Logic device to which the analyzed cell is connected;
++* Cell – position of the analyzed cell for which OCV and Resistance values are provided;
++* OCV – cell voltage Uocv, V;
++* Resistance – cell resistance, Ohm.

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Changes for page 3.3 Control

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