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Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 23.1
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To version 25.1
edited by Admin
on 2024/12/11 10:29
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1 -== 3.4.1 Cell defaults ==
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2 += Configuration =
2 2  
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5 +== Battery parameters ==
6 +
7 +=== Cell defaults ===
8 +
3 3  To change the default cell settings, select the menu "Cells → Cell defaults":
4 4  
5 5  [[image:1732205873121-893.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="281" width="374"]]
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20 20  
21 21  The “Reset cell parameters” command is used for starting-up and adjustment of battery.
22 22  
23 -== 3.4.2 SOC estimation ==
29 +=== SOC estimation ===
24 24  
25 25  The BMS Main 2.x board calculates the state of charge of the battery (SOC) using two algorithms:
26 26  
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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 [[3.4.6 Cell analysis>>doc:||anchor="H3.4.6Cellanalysis"]]);
54 +* 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 [[Cell analysis>>doc:||anchor="HCellanalysis"]]);
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;
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61 61  
62 62  The SOC calculation algorithm “Current and voltage (enhanced)” differs from the simplified algorithm by online correction of effective capacitance. When using this algorithm, it is necessary to fine tune the tabular dependence Uocv = Uocv (SOC, t °C).
63 63  
64 -== 3.4.3 Cell resistance estimation ==
70 +=== Cell resistance estimation ===
65 65  
66 66  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
67 67  
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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 [[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).
100 +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 [[Cell defaults>>doc:||anchor="HCelldefaults"]]). 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 -== 3.4.4 Cell balancing ==
102 +=== Cell balancing ===
97 97  
98 98  The BMS Main 2.x supports two cell balancing algorithms:
99 99  
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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 [[3.6.18 Logic high temperature protection>>doc:drafts.BMS Main 2\.1.3\. Configuration.3\.6 Battery protection.WebHome||anchor="H3.6.18 Logic high temperature protection"]]).
124 +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>>doc:drafts.BMS Main 2\.1.3\. Configuration.3\.6 Battery protection.WebHome||anchor="HLogichightemperatureprotection"]]).
119 119  
120 120  To change the cell balancing parameters, select the menu "Cell → Cell balancing":
121 121  
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136 136  * Start cell discharging – a command to start forced balancing of all battery cells (used for service purposes);
137 137  * Stop cell discharging – a command to stop forced balancing of all battery cells (used for service purposes).
138 138  
139 -== 3.4.5 Series balancing ==
145 +=== Series balancing ===
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 [[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.
149 +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 [[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  
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162 162  * Coulomb threshold – the difference of the charges Qthr, given by a series of cells, above which balancing to be started, Ah;
163 163  * Period – period to reset of charge counters for each series (to avoid accumulation of error), second.
164 164  
165 -== 3.4.6 Cell analysis ==
171 +=== 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 [[3.4.2 SOC estimation>>doc:||anchor="3.4.2 SOC estimation"]]), which is necessary for calculating the state of charge of the battery.
173 +Discharge characteristics of the battery – the dependence Uocv = Uocv (DOD) – is used to determine the tabular dependence Uocv = Uocv (SOC, t °C) (see [[SOC estimation>>doc:||anchor="HSOCestimation"]]), 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  
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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 ==
234 +=== Charge current map ===
229 229  
230 230  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  
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248 248  
249 249  Charging current limit = Maximum charging current × Kcs × Kcc × Kcv × Kct.
250 250  
251 -== 3.4.8 Discharge current map ==
257 +=== Discharge current map ===
252 252  
253 253  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.
254 254  
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272 272  
273 273  Discharging current limit = Maximum discharging current × Kds × Kdc × Kdv × Kdt.
274 274  
275 -== 3.4.9 SOC correction ==
281 +=== SOC correction ===
276 276  
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"]]).
283 +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 [[SOC estimation>>doc:||anchor="HSOCestimation"]]).
278 278  
279 279  To configure parameters for periodically correcting the battery state of charge, select the menu "Cells → SOC correction":
280 280