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Changes for page 3.3 Control

Last modified by Admin on 2025/04/09 12:15
From version 10.1
edited by Admin
on 2025/02/24 11:27
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To version 23.2
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Summary

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Content
... ... @@ -102,18 +102,26 @@
102 102  
103 103  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
104 104  
105 -R = (U-U,,ocv,,) / I,,stable,,,
105 +{{formula fontSize="SMALL" imageType="PNG"}}
106 +R = \frac{U-U_{ocv}}{I_{stable}}
107 +{{/formula}}
106 106  
107 107  where U is the cell voltage measured in the charge or discharge state, V; U,,ocv,, is the cell voltage measured in the state of relaxation (before switching to the state of charge or discharge); I,,stable,, – stabilized current through the cell in the state of charge or discharge.
108 108  
109 109  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
110 110  
111 -R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
113 +{{formula fontSize="SMALL"}}
114 +R = \frac{U_2-U_1}{I_{stable2}-I_{stable1}}
115 +{{/formula}}
112 112  
113 -(Q,,max,, is the maximum cell capacity),
117 +provided that
114 114  
115 -where U,,2,, is the voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, – the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.
119 +{{formula fontSize="SMALL"}}
120 +| I_{stable2}-I_{stable1} | > 0.2 × Qmax
121 +{{/formula}}
116 116  
123 +where Q,,max,, — the maximum cell capacity,U,,2,, — voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, — the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.
124 +
117 117  The stabilized current I,,stable,, = I, if during the stabilization time the instantaneous current I is in the range from 0.95 × I to 1.05 × I.
118 118  
119 119  To change parameters of the algorithm for calculating the cell resistance, select the "Control → Resistance estimation" section:
... ... @@ -130,6 +130,62 @@
130 130  
131 131  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).
132 132  
141 +=== Low SOC (signal) ===
142 +
143 +To change the parameters of the generation a signal about low battery level, select the "Control → Low SOC (signal)" section:
144 +
145 +[[image:1740396460923-423.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="141" width="800"]]
146 +
147 +In this section:
148 +
149 +* Enable – a flag to enable signal generation;
150 +* Minimum SOC, %;
151 +* Tolerant SOC, %;
152 +* Delay before setting the signal, second;
153 +* Delay before clearing the signal, second;
154 +* Lock – lock the signal until the device is reset.
155 +
156 +Signal generation conditions:
157 +
158 +* the battery SOC is less than the “Minimum SOC” value during the “Delay before setting the signal” time.
159 +
160 +Conditions for clearing the signal:
161 +
162 +* the battery SOC is greater than the “Tolerant SOC” during the “Delay before clearing the signal” time.
163 +
164 +(% class="box infomessage" %)
165 +(((
166 +The "Low SOC signal" is indicative and can be output to a discrete output or a power switch.
167 +)))
168 +
169 +=== High charging current (signal) ===
170 +
171 +To change the parameters of the generation high-current signal, select the "Control → High charging current (signal)" section:
172 +
173 +[[image:1740396996935-403.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="144" width="800"]]
174 +
175 +In this section:
176 +
177 +* Enable – a flag to enable signal generation;
178 +* Maximum charging current, А;
179 +* Tolerant charging current, А;
180 +* Delay before setting the signal, second;
181 +* Delay before clearing the signal, second;
182 +* Lock – lock the signal until the device is reset.
183 +
184 +Signal generation conditions:
185 +
186 +* the measured current is greater than the “Maximum charging current” value during the “Delay before setting the signal” time.
187 +
188 +Conditions for clearing the signal:
189 +
190 +* the measured current is less than the “Tolerant charging current” value during the “Delay before clearing the signal” time.
191 +
192 +(% class="box infomessage" %)
193 +(((
194 +The "High charging current" signal is indicative and can be output to a discrete output or a power switch.
195 +)))
196 +
133 133  === Charge map ===
134 134  
135 135  The BMS Mini device calculates maximum allowable charge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.
... ... @@ -138,31 +138,25 @@
138 138  
139 139  To configure parameters for determining the charge current limit, select the "Control → Charge map" section:
140 140  
141 -[[image:1733746766504-864.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="138" width="800"]]
142 -
205 +[[image:1740397188247-315.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="179" width="800"]]
143 143  In this section:
144 144  
145 145  * Enable – a flag to start calculation of the charge current limit;
146 -* Maximum charge current – a maximum allowable value of the charge current (under normal conditions):
147 -* Option 1: Limit charge current by the battery SOC and temperature – a flag to enable correction of maximum allowable charging current Kcs depending on SOC and battery temperature;
209 +* Maximum charge current – a maximum allowable value of the charge current (under normal conditions), A;
210 +* Rate of change – a rate of change the current limit to a new value (0 is for immediate change), A/s;
211 +* Option 1: Limit charge current by the battery SOC and temperature – a flag to enable correction of maximum allowable charging current** Kcs** depending on SOC and battery temperature;
148 148  * Option 1: SOC x Temperature x Factor – the dependence of the correction factor on SOC and battery temperature;
149 -
150 -[[image:1733746766506-660.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="196" width="800"]]
151 -
152 -* Option 2: Limit charge current by the contactor temperature – a flag to enable correction of maximum allowable charging current Kcc depending on contactor temperature;
213 +* Option 2: Limit charge current by the contactor temperature – a flag to enable correction of maximum allowable charging current **Kcc** depending on contactor temperature;
153 153  * Option 2: Contactor temperature x Factor – the dependence of the correction factor on SOC and contactor temperature;
215 +* Option 3: Limit charge current by the maximum cell voltage - a flag to enable correction of maximum allowable charging current **Kcv** depending on maximum cell voltage;
216 +* Option 3: Cell voltage x Factor – the dependence of the correction factor on maximum cell voltage;
217 +* Option 4: Limit charge current by the cell temperature - a flag to enable correction of maximum allowable charging current **Kct** depending on maximum cell temperature;
218 +* Option 4: Cell temperature x Factor – the dependence of the correction factor on maximum cell temperature.
154 154  
155 -[[image:1733746766508-178.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="184" width="800"]]
220 +Value of the charge current limit at given SOC, temperature, contactors temperature, maximum cell voltage and maximum cell temperature is calculated as follows:
156 156  
157 -* Option 3: Limit charge current by the maximum cell voltage - a flag to enable correction of maximum allowable charging current Kcv depending on maximum cell voltage;
158 -* Option 3: Cell voltage x Factor – the dependence of the correction factor on maximum cell voltage.
222 +**Charge current limit = Maximum charge current × Kcs × Kcc × Kcv × Kct**
159 159  
160 -[[image:1733746766509-971.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="217" width="800"]]
161 -
162 -Value of the charge current limit at given SOC, temperature, contactors temperature and maximum cell voltage is calculated as follows:
163 -
164 -Charging current limit = Maximum charging current × Kcs × Kcc × Kcv
165 -
166 166  === Discharge map ===
167 167  
168 168  The BMS Mini device calculates maximum allowable discharge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.
... ... @@ -171,31 +171,137 @@
171 171  
172 172  To configure parameters for determining the discharge current limit, select the "Control → Discharge map" section:
173 173  
174 -[[image:1733746766511-477.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="149" width="800"]]
232 +[[image:1740397304972-174.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="182" width="800"]]
175 175  
176 176  In this section:
177 177  
178 178  * Enable – a flag to start calculation of the discharge current limit;
179 -* Maximum discharge current – a maximum allowable value of the discharge current (under normal conditions):
180 -* Option 1: 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;
237 +* Maximum discharge current – a maximum allowable value of the discharge current (under normal conditions), A;
238 +* Rate of change – a rate of change the current limit to a new value (0 is for immediate change), A/s;
239 +* Option 1: 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;
181 181  * Option 1: SOC x Temperature x Factor – the dependence of the correction factor on SOC and battery temperature;
241 +* Option 2: Limit discharge current by the contactor temperature – a flag to enable correction of maximum allowable discharging current **Kdc** depending on contactor temperature;
242 +* Option 2: Contactor temperature x Factor – the dependence of the correction factor on SOC and contactor temperature;
243 +* Option 3: Limit discharge current by the cell voltage - a flag to enable correction of maximum allowable discharging current **Kdv** depending on minimum cell voltage;
244 +* Option 3: Cell voltage x Factor – the dependence of the correction factor on minimum cell voltage;
245 +* Option 4: Limit discharge current by the cell temperature - a flag to enable correction of maximum allowable discharging current **Kdt** depending on maximum cell temperature;
246 +* Option 4: Cell voltage x Factor – the dependence of the correction factor on minimum cell temperature.
182 182  
183 -[[image:1733746766512-300.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="195" width="800"]]
248 +Value of the discharge current limit at given SOC, temperature, contactors temperature, minimum cell voltage and maximum cell temperature is calculated as follows:
184 184  
185 -* Option 2: Limit discharge current by the contactor temperature – a flag to enable correction of maximum allowable discharging current Kdc depending on contactor temperature;
186 -* Option 2: Contactor temperature x Factor – the dependence of the correction factor on SOC and contactor temperature;
250 +**Discharge current limit = Maximum discharge current × Kds × Kdc × Kdv × Kdt**
187 187  
188 -[[image:1733746766513-161.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="183" width="800"]]
252 +=== Main contactor ===
189 189  
190 -* Option 3: Limit discharge current by the cell voltage - a flag to enable correction of maximum allowable discharging current Kdv depending on minimum cell voltage;
191 -* Option 3: Cell voltage x Factor – the dependence of the correction factor on minimum cell voltage.
254 +The BMS Mini 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 a case of sealing of the charging or discharging contactors.
192 192  
193 -[[image:1733746766514-686.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="215" width="800"]]
256 +The Main contactor algorithm supports the following modes:
194 194  
195 -Value of the discharge current limit at given SOC, temperature, contactors temperature and minimum cell voltage is calculated as follows:
258 +* Always on;
259 +* Automatic.
196 196  
197 -Discharging current limit = Maximum discharging current × Kds × Kdc × Kdv
261 +In “Always on” mode main contactor closes if all the following is true:
198 198  
263 +* Other contactors are open;
264 +* There are no errors from the "Errors 1, 2 ..." bitfileds.
265 +
266 +In “Always on” mode main contactor opens if all the following is true:
267 +
268 +* Other contactors are open;
269 +* There is an error from the the "Errors 1, 2 ..." bitfileds.
270 +
271 +In “Automatic” mode, the main contactor closes by internal algorithms at the same time with other contactors.
272 +
273 +In “On demand” mode, the main contactor closes by external the “Close Main contactor” request.
274 +
275 +(% class="box infomessage" %)
276 +(((
277 +**Note: **when errors occur in the system, the **Main **contactor opens either immediately or with the delay T,,off,, (depends on the settings described below).
278 +)))
279 +
280 +To change the parameters of the main contactor, select the "Control → Main contactor" section:
281 +
282 +[[image:1740397558976-651.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="144" width="800"]]
283 +
284 +In this section:
285 +
286 +* Enable – a flag to enable the main contactor control;
287 +* Algorithm – main contactor control algorithm:
288 +** Always on – contactor is always closed;
289 +** Automatic – contactor closes by internal charge and discharge algorithms;
290 +** On demand – contactor is closed by an external request;
291 +* Time to keep the contactor closed before closing the others – a time for other contactors to be open after the main contactor is closed;
292 +* Delay before opening the contactor – a time which is used to detect conditions for opening the contactor, s;
293 +* Keep the contactor open until the device is restarted – a flag for keeping the main contactor open until the system is reset;
294 +* Errors 1, 2 to open the main contactor – bitfields to choose the errors which will open the main contactor.
295 +
296 +=== Charging status ===
297 +
298 +To change the parameters of charging process status, select the "Control → Charging status" section:
299 +
300 +[[image:1740399071280-626.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="123" width="800"]]
301 +In this section:
302 +
303 +* Current to set the "Charging current present" – a current level to generate the "Charging current present" signal, A;
304 +* Current to clear the "Charging current present" – a current level to clear the "Charging current present" signal, A;
305 +* Voltage to clear the “Ready to charge” – a threshold voltage level on the cell, V; if the voltage of any cell is above this level, the “Ready to charge” (hence, the “Allow charging”) signal is cleared;
306 +* Voltage to reset the “Ready to charge” – a tolerant voltage level on the cell, V; if all cell voltages are below the tolerant level, the “Ready to charge” (hence, the “Allow charging”) signal is set;
307 +* Delay before recharging – a time after which the previously opened the allow charging contactor closes again, minute; to disable the operation by timeout set "Delay before recharging" to 0;
308 +* Errors 1, 2 to clear the "Ready to charge" – bitfields to choose the errors which will clear the "Ready to charge" signal.
309 +
310 +(% class="box infomessage" %)
311 +(((
312 +**Note:** The "Allow charging" signal activates under two independent conditions:
313 +1) the voltage on the cells reaches the “Voltage to reset the “Ready to charge"” level and
314 +2) the "Delay before recharging" time has passed since the opening of the allow charging contactor.
315 +)))
316 +
317 +=== Discharging status ===
318 +
319 +To change the parameters of discharging process status, select the "Control → Discharging status" section:
320 +
321 +[[image:1740399096018-240.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="110" width="800"]]
322 +In this section:
323 +
324 +* Current to set the "Discharging current present" – a current level to generate the "Discharging current present" signal, А;
325 +* Current to clear the "Discharging current present" – a current level to clear the "Discharging current present" signal, А;
326 +* 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;
327 +* 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;
328 +* Errors 1, 2 to clear the "Ready to discharge" – bitfields to choose the errors which will clear the "Ready to discharge" signal.
329 +
330 +=== Precharge ===
331 +
332 +The BMS Main 3 device can control the precharge contactor. The precharge contactor is used to charge the intermediate capacity with low current and usually placed with the limiting resistor in parallel to charging or discharging contactor.
333 +
334 +BMS Main 3 device detects errors while pre-charging the load capacity by monitoring the current and voltage difference before and after contactors. Also BMS can measure the power dissipated on precharge resistor and generate an error if it greater than configured limit.
335 +
336 +[[image:1740399150173-761.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="155" width="800"]]
337 +
338 +To change the parameters of precharge contactor, select the "Control → Precharge" section:
339 +
340 +* Precharge current threshold to finish precharging – a minimum current value at which precharging process assumed to be finished, A;
341 +* Minimum voltage difference to finish precharging – minimal voltage difference before and after contactors at which precharge process is meant to be finished, V;
342 +* Number of precharging attempts – maximum number of precharging attempts before setting the "Precharge error";
343 +* Precharge time – a duration of closing the precharge contactor before closing the discharging contactor, millisecond;
344 +* Relaxation between attempts – a duration between precharge attempts, millisecond;
345 +* Check the power dissipated in the preacharge resistor - a flag to enable the calculation of power dissipated in precharge resistor;
346 +* Precharge resistor resistance, Ohm;
347 +* Maximum allowable power dissipated in the resistor, W;
348 +* Delay before setting the "Precharge error" when checking power, millisecond;
349 +* Delay before clearing the "Precharge error", second;
350 +* Lock the "Precharge error" – a flag to block the error until the device is restarted.
351 +
352 +“Precharge error” generation conditions if any of the following is true:
353 +
354 +* the precharge current does not decrease during the "Precharge time" after "Number of precharging attempts";
355 +* voltages before and after contactors are not equal during the "Precharge time" after "Number of precharging attempts";
356 +* power dissipated on the precharge resistor is above the maximum value during the “Delay before setting the 'Precharge error' when checking power” time.
357 +
358 +(% class="box warningmessage" %)
359 +(((
360 +Behavior of contactors at “Precharge error” is configured in corresponding contactor settings!
361 +)))
362 +
199 199  === Charge ===
200 200  
201 201  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.
... ... @@ -380,38 +380,8 @@
380 380  * Maximum voltage – maximum battery voltage, V;
381 381  * 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.
382 382  
383 -=== Main contactor ===
547 +=== ===
384 384  
385 -The BMS Mini 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 a case of sealing of the charging or discharging contactors.
386 -
387 -The main contactor closes if there are no errors from the list below:
388 -
389 -* Overcurrent;
390 -* Undervoltage;
391 -* Overvoltage;
392 -* High temperature (CH);
393 -* High temperature (DCH);
394 -* Unallowable charging;
395 -* Critical error.
396 -
397 -The main contactor opens if the charging and discharging contactors are opened and any of the following conditions is met:
398 -
399 -* charging or discharging current is detected during a set time;
400 -* voltage of any cell is lower than the minimum cell voltage configured in the section "Protections → Undervoltage" during a set time;
401 -* voltage of any cell is greater than the maximum cell voltage configured in the section "Protections → Overvoltage" during a set time;
402 -* temperature of any cell is greater than the maximum cell temperature configured in the section "Protections → High temperature" during a set time;
403 -* Critical error stays on during a set time.
404 -
405 -To change the parameters of the main contactor, select the "Control → Main contactor" section:
406 -
407 -[[image:1733746797002-498.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="93" width="800"]]
408 -
409 -In this section:
410 -
411 -* Enable – a flag to enable the main contactor control;
412 -* Delay before opening the contactor – a time which is used to detect conditions for opening the contactor, second;
413 -* Keep the contactor open until the device is restarted – a flag for keeping the main contactor opened until the system be reset.
414 -
415 415  === Cell balancing ===
416 416  
417 417  Balancing makes the voltage of all cells be equal to the minimum cell voltage.
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