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Changes for page 3.4 Battery parameters

Last modified by Admin on 2026/04/24 10:30
From version 33.4
edited by Admin
on 2025/02/20 14:22
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To version 35.2
edited by Admin
on 2026/04/02 13:52
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170 170  
171 171  The BMS Main 2.x board supports work with two independent (galvanically unrelated) cell series. To monitor the status of two series, two current sensors are used: primary and secondary (AUX). A series of cells must be equivalent: they must have the same number of cells and the same capacity.
172 172  
173 -Since the series of cells can operate at different loads, they must be balanced. For this, the BMS Main 2.x provides two relays: “Balancing series 1” and “Balancing series 2” (see [[Input and output signals>>doc:Battery management systems.BMS Main 2\.1.3\. Configuration.3\.3 Input and output signals.WebHome]]), as well as a combined algorithm that considers both the voltage of each series and the charge that these series gave load. “Balancing series 1” and “Balancing series 2” relays are used to connect high-power balancing resistors in parallel with cells series 1 and 2.
173 +Since the series of cells can operate at different loads, they must be balanced. For this, the BMS Main 2.x provides two relays: “Balancing series 1” and “Balancing series 2” (see [[Input and output signals>>doc:Battery management systems.EOL devices.BMS Main 2\.1.3\. Configuration.3\.3 Input and output signals.WebHome]]), as well as a combined algorithm that considers both the voltage of each series and the charge that these series gave load. “Balancing series 1” and “Balancing series 2” relays are used to connect high-power balancing resistors in parallel with cells series 1 and 2.
174 174  
175 175  When charging the battery, balancing is performed based on the voltage of the series. A balancing resistor is connected to the cell series if:
176 176  
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271 271  * Maximum charging current – a maximum allowable value of the charge current (under normal conditions):
272 272  * Limit charging current by the battery SOC and temperature – a flag to enable correction of maximum allowable charging current Kcs depending on the __maximum cell SOC__ and temperature;
273 273  * Limit charging current by the contactor temperature – a flag to enable correction of maximum allowable charging current Kcc depending on the contactor temperature;
274 -* Limit charging current by the maximum cell voltage – a flag to enable correction of maximum allowable charging current Kcv depending on __the maximum cell voltage__;
274 +* Limit charging current by the maximum cell voltage – a flag to enable correction of maximum allowable charging current Kcv depending on __the maximum cell U,,ocv,, voltage__ (corrected due to current and cell resistance);
275 275  * Limit charging current by the maximum cell temperature – a flag to enable correction of maximum allowable charging current Kct depending on cell temperature.
276 276  
277 277  Value of the charge current limit at given SOC, temperature, contactors temperature and maximum cell voltage is calculated as follows:
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284 284  
285 285  Calculated currents values are sending or intellectual loads over the CAN bus.
286 286  
287 -To configure parameters for determining the charge current limit, select the menu "Cells → Charge current map":
287 +To configure parameters for determining the discharge current limit, select the menu "Cells → Charge current map":
288 288  
289 289  [[image:1732208218667-968.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="631" width="434"]]
290 290  
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293 293  * Enable – a flag to start calculation of the discharge current limit;
294 294  * Maximum discharging current – a maximum allowable value of the discharge current (under normal conditions):
295 295  * Current factor – the dependence of the correction factor on SOC and the battery temperature – Kdischarge=Kdischarge (SOC, t°C).
296 -* Limit discharging current by the battery SOC and temperature – a flag to enable correction of maximum allowable discharging current Kds depending on SOC and temperature;
296 +* Limit discharging current by the battery SOC and temperature – a flag to enable correction of maximum allowable discharging current Kds depending __on the minimum cell SOC__ and temperature;
297 297  * Limit discharging current by the contactor temperature – a flag to enable correction of maximum allowable discharging current Kdc depending on the contactor temperature;
298 -* Limit discharging current by the maximum cell voltage - a flag to enable correction of maximum allowable discharging current Kdv depending on maximum cell voltage;
298 +* Limit discharging current by the maximum cell voltage - a flag to enable correction of maximum allowable discharging current Kdv depending __the minimum cell U,,ocv,, voltage__ (corrected due to current and cell resistance);
299 299  * Limit discharging current by the maximum cell temperature - a flag to enable correction of maximum allowable discharging current Kdt depending on cell temperature .
300 300  
301 301  Value of the discharge current limit at given SOC, temperature, contactors temperature and maximum cell voltage is calculated as follows: