Skip to Content

Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 8.4
edited by Admin
on 2024/11/21 16:52
Change comment: There is no comment for this version
To version 18.1
edited by Admin
on 2024/12/02 15:15
Change comment: There is no comment for this version

Summary

Details

Page properties
Parent
... ... @@ -1,1 +1,1 @@
1 -drafts.bms-main-2-1.configuration.WebHome
1 +drafts.BMS Main 2\.1.3\. Configuration.WebHome
Content
... ... @@ -2,7 +2,7 @@
2 2  
3 3  To change the default cell settings, select the menu "Cells → Cell defaults":
4 4  
5 -[[Cell default section>>image:1732205873121-893.png||data-xwiki-image-style-alignment="center" height="313" width="416"]]
5 +[[image:1732205873121-893.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="281" width="374"]]
6 6  
7 7   In this section:
8 8  
... ... @@ -31,7 +31,7 @@
31 31  
32 32  To change the parameters of the algorithm for calculating the battery SOC, select the menu "Cells → SOC estimation":
33 33  
34 -[[SOC estimation section>>image:1732206031847-819.png||data-xwiki-image-style-alignment="center" height="849" width="356"]]
34 +[[image:1732206031847-819.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="849" width="356"]]
35 35  
36 36  In this section:
37 37  
... ... @@ -45,7 +45,7 @@
45 45  * Scale the final SOC – flag to scale the battery SOC by the following values;
46 46  * Internal SOC corresponding to 0% – battery SOC that sets to be 0%;
47 47  * Internal SOC corresponding to 100% – battery SOC that sets to be 100%.
48 -* Uocv = Uocv(SOC, t °C) – the dependence of the cell open circuit voltage Uocv on SOC and the cell temperature (selected for specific batteries, can be established experimentally – see section Determining the discharge characteristic);
48 +* Uocv = Uocv(SOC, t °C) – the dependence of the cell open circuit voltage Uocv on SOC and the cell temperature (selected for specific batteries, can be established experimentally – see [[3.4.6 Cell analysis>>doc:||anchor="3.4.6 Cell analysis"]]);
49 49  * Linear zone – linear zone of dependence Uocv = Uocv(SOC, t °C):
50 50  ** Uocv ,,[point 1],, – starting point of the linear zone;
51 51  ** Uocv ,,[point 2],, – end point of the linear zone;
... ... @@ -81,7 +81,7 @@
81 81  
82 82  To change parameters of the algorithm for calculating the cell resistance, select the menu "Cells → Cell resistance estimation":
83 83  
84 -[[Cell resistance estimation settings>>image:1732207338609-903.png||data-xwiki-image-style-alignment="center" height="187" width="337"]]
84 +[[image:1732207338609-903.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="187" width="337"]]
85 85  
86 86  In this section:
87 87  
... ... @@ -91,7 +91,7 @@
91 91  * Minimum SOC – minimum cell SOC value for resistance calculation;
92 92  * Maximum SOC – maximum cell SOC value for resistance calculation.
93 93  
94 -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 section Cell defaults). 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).
94 +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 [[3.4.1 Cell defaults>>doc:||anchor="3.4.1 Cell defaults"]]). 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).
95 95  
96 96  == 3.4.4 Cell balancing ==
97 97  
... ... @@ -115,11 +115,11 @@
115 115  * the voltage on the cell is higher than the starting voltage of the balancing;
116 116  * the difference between the cell voltage and the minimum voltage among the cells of the battery is greater than the balancing threshold.
117 117  
118 -If the BMS Logic board overheats, then the balancing of the cells connected to this board will not be performed (see Logic high temperature protection).
118 +If the BMS Logic board overheats, then the balancing of the cells connected to this board will not be performed (see [[3.6.18 Logic high temperature protection>>doc:drafts.BMS Main 2\.1.3\. Configuration.3\.6 Battery protection.WebHome||anchor="3.6.18 Logic high temperature protection"]]).
119 119  
120 120  To change the cell balancing parameters, select the menu "Cell → Cell balancing":
121 121  
122 -[[Cell balancing settings>>image:1732207485773-804.png||data-xwiki-image-style-alignment="center" height="264" width="387"]]
122 +[[image:1732207485773-804.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="264" width="387"]]
123 123  
124 124  In this section:
125 125  
... ... @@ -140,7 +140,7 @@
140 140  
141 141  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.
142 142  
143 -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 section Configuration of output discrete signals and relays), 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.
143 +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 [[3.3 Input and output signals>>doc:drafts.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.
144 144  
145 145  When charging the battery, balancing is performed based on the voltage of the series. A balancing resistor is connected to the cell series if:
146 146  
... ... @@ -151,7 +151,7 @@
151 151  
152 152  To change the series balancing parameters, select the menu "Cell → Series balancing":
153 153  
154 -[[Series balancing settings>>image:1732207584941-447.png||data-xwiki-image-style-alignment="center" height="258" width="438"]]
154 +[[image:1732207584941-447.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="258" width="438"]]
155 155  
156 156  In this section:
157 157  
... ... @@ -164,7 +164,7 @@
164 164  
165 165  == 3.4.6 Cell analysis ==
166 166  
167 -Discharge characteristics of the battery – the dependence Uocv = Uocv (DOD) – is used to determine the tabular dependence Uocv = Uocv (SOC, t °C) (see section Calculating the state of charge (SOC)), which is necessary for calculating the state of charge of the battery.
167 +Discharge characteristics of the battery – the dependence Uocv = Uocv (DOD) – is used to determine the tabular dependence Uocv = Uocv (SOC, t °C) (see [[3.4.2 SOC estimation>>doc:||anchor="3.4.2 SOC estimation"]]), which is necessary for calculating the state of charge of the battery.
168 168  
169 169  The BMS Main 2.x board can automatically determine the battery discharge characteristic.
170 170  
... ... @@ -176,7 +176,7 @@
176 176  
177 177  To configure parameters for determining the discharge characteristic of the battery, select the menu "Cells → Cell analysis":
178 178  
179 -[[Cell analysis section>>image:1732207696322-587.png||data-xwiki-image-style-alignment="center" height="213" width="258"]]
179 +[[image:1732207696322-587.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="213" width="258"]]
180 180  
181 181  In this section:
182 182  
... ... @@ -227,17 +227,58 @@
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 over the CAN bus.
233 +
234 +To configure parameters for determining the charge current limit, select the menu "Cells → Charge current map":
235 +
236 +[[image:1732208033738-498.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" 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 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 +
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 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 +[[image:1732208218667-968.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" 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 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 +
234 234  == 3.4.9 SOC correction ==
235 235  
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)).
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 [[3.4.2 SOC estimation>>doc:||anchor="3.4.2 SOC estimation"]]).
237 237  
238 238  To configure parameters for periodically correcting the battery state of charge, select the menu "Cells → SOC correction":
239 239  
240 -[[SOC correction settings>>image:1732206262509-786.png||data-xwiki-image-style-alignment="center" height="291" width="298"]]
281 +[[image:1732206262509-786.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="291" width="298"]]
241 241  
242 242   In this section:
243 243  
... ... @@ -244,6 +244,7 @@
244 244  * Enable – a flag to enable SOC correction;
245 245  * Shutdown period – a time the battery is off, day. If the BMS detects on its startup that it was off during the “Shutdown period” time, the BMS recalculates the battery state of charge base on the tabular dependency Uocv = Uocv (SOC, t);
246 246  * Correction period – a period of correcting the battery SOC, day. If the BMS detects that the last correction was more than the “Correction period” ago, the BMS recalculates the battery state of charge base on the tabular dependency Uocv = Uocv (SOC, t) and tunes it gradually during the “SOC change time”;
247 -* SOC change time – a duration of the linear changing the battery SOC to the value calculated by the correction algorithm, minute.
288 +* SOC change time – a duration of the linear changing the battery SOC to the value calculated by the correction algorithm, minute;
289 +* Ignore the linear zone – a flag to ignore linear zone while calculating SOC correction.
248 248  
249 249  
1732208033738-498.png
Author
... ... @@ -1,0 +1,1 @@
1 +XWiki.admin
Size
... ... @@ -1,0 +1,1 @@
1 +42.7 KB
Content
1732208218667-968.png
Author
... ... @@ -1,0 +1,1 @@
1 +XWiki.admin
Size
... ... @@ -1,0 +1,1 @@
1 +41.9 KB
Content