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Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 8.3
edited by Admin
on 2024/11/21 16:50
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To version 12.3
edited by Admin
on 2024/11/22 15:12
Change comment: Update document after refactoring.

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1 -drafts.bms-main-2-1.configuration.WebHome
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225 225  * OCV – cell voltage Uocv, V;
226 226  * Resistance – cell resistance, Ohm.
227 227  
228 +== 3.4.7 Charge current map ==
228 228  
230 +The BMS Main 2.x board calculates maximum allowable charge current values in respect to SOC and battery temperature, contactor temperature and maximum cell voltage.
229 229  
230 -== SOC correction ==
232 +Calculated currents values are sending to chargers or intellectual loads over the CAN bus.
231 231  
234 +To configure parameters for determining the charge current limit, select the menu "Cells → Charge current map":
235 +
236 +[[Charge current map settings>>image:1732208033738-498.png||data-xwiki-image-style-alignment="center" height="655" width="453"]]
237 +
238 +In this section:
239 +
240 +* Enable – a flag to start calculation of the charge current limit;
241 +* Maximum charging current – a maximum allowable value of the charge current (under normal conditions):
242 +* Limit charging current by the battery SOC and temperature – a flag to enable correction of maximum allowable charging current Kcs depending on SOC and temperature;
243 +* Limit charging current by the contactor temperature – a flag to enable correction of maximum allowable charging current Kcc depending on the contactor temperature;
244 +* Limit charging current by the maximum cell voltage – a flag to enable correction of maximum allowable charging current Kcv depending on maximum cell voltage;
245 +* Limit charging current by the maximum cell temperature – a flag to enable correction of maximum allowable charging current Kct depending on maximum cell temperature.
246 +
247 +Value of the charge current limit at given SOC, temperature, contactors temperature and maximum cell voltage is calculated as follows:
248 +
249 +Charging current limit = Maximum charging current × Kcs × Kcc × Kcv × Kct.
250 +
251 +== 3.4.8 Discharge current map ==
252 +
253 +The BMS Main 2.x board calculates maximum allowable discharge current values in respect to SOC and battery temperature, contactor temperature and maximum cell voltage.
254 +
255 +Calculated currents values are sending to chargers or intellectual loads over the CAN bus.
256 +
257 +To configure parameters for determining the charge current limit, select the menu "Cells → Charge current map":
258 +
259 +[[Discharge current map settings>>image:1732208218667-968.png||data-xwiki-image-style-alignment="center" height="631" width="434"]]
260 +
261 +In this section:
262 +
263 +* Enable – a flag to start calculation of the discharge current limit;
264 +* Maximum discharging current – a maximum allowable value of the discharge current (under normal conditions):
265 +* Current factor – the dependence of the correction factor on SOC and the battery temperature – Kdischarge=Kdischarge (SOC, t°C).
266 +* 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;
267 +* Limit discharging current by the contactor temperature – a flag to enable correction of maximum allowable discharging current Kdc depending on the contactor temperature;
268 +* Limit discharging current by the maximum cell voltage - a flag to enable correction of maximum allowable discharging current Kdv depending on maximum cell voltage;
269 +* Limit discharging current by the maximum cell temperature - a flag to enable correction of maximum allowable discharging current Kdt depending on maximum cell temperature .
270 +
271 +Value of the discharge current limit at given SOC, temperature, contactors temperature and maximum cell voltage is calculated as follows:
272 +
273 +Discharging current limit = Maximum discharging current × Kds × Kdc × Kdv × Kdt.
274 +
275 +== 3.4.9 SOC correction ==
276 +
232 232  The BMS Main 2.x board 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 Calculating the state of charge (SOC)).
233 233  
234 234  To configure parameters for periodically correcting the battery state of charge, select the menu "Cells → SOC correction":
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