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Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 9.1
edited by Admin
on 2024/11/21 16:53
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To version 9.3
edited by Admin
on 2024/11/21 16:55
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227 227  
228 228  == 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.
230 230  
232 +Calculated currents values are sending to chargers or intellectual loads over the CAN bus.
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 Kc depending on maximum cell voltage.
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
250 +
231 231  == 3.4.8 Discharge current map ==
232 232  
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.
233 233  
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 +
234 234  == 3.4.9 SOC correction ==
235 235  
236 236  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)).