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Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 10.3
edited by Admin
on 2024/11/21 16:58
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To version 8.3
edited by Admin
on 2024/11/21 16:50
Change comment: There is no comment for this version

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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 ==
229 229  
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.
231 231  
232 -Calculated currents values are sending to chargers or intellectual loads over the CAN bus.
230 +== SOC correction ==
233 233  
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 -
277 277  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)).
278 278  
279 279  To configure parameters for periodically correcting the battery state of charge, select the menu "Cells → SOC correction":
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