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Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 25.1
edited by Admin
on 2024/12/11 10:29
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To version 24.1
edited by Admin
on 2024/12/02 15:25
Change comment: There is no comment for this version

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2 -= Configuration =
1 +== 3.4.1 Cell defaults ==
3 3  
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5 -== Battery parameters ==
6 -
7 -=== Cell defaults ===
8 -
9 9  To change the default cell settings, select the menu "Cells → Cell defaults":
10 10  
11 11  [[image:1732205873121-893.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="281" width="374"]]
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26 26  
27 27  The “Reset cell parameters” command is used for starting-up and adjustment of battery.
28 28  
29 -=== SOC estimation ===
23 +== 3.4.2 SOC estimation ==
30 30  
31 31  The BMS Main 2.x board calculates the state of charge of the battery (SOC) using two algorithms:
32 32  
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51 51  * Scale the final SOC – flag to scale the battery SOC by the following values;
52 52  * Internal SOC corresponding to 0% – battery SOC that sets to be 0%;
53 53  * Internal SOC corresponding to 100% – battery SOC that sets to be 100%.
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"]]);
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"]]);
55 55  * Linear zone – linear zone of dependence Uocv = Uocv(SOC, t °C):
56 56  ** Uocv ,,[point 1],, – starting point of the linear zone;
57 57  ** Uocv ,,[point 2],, – end point of the linear zone;
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67 67  
68 68  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).
69 69  
70 -=== Cell resistance estimation ===
64 +== 3.4.3 Cell resistance estimation ==
71 71  
72 72  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
73 73  
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97 97  * Minimum SOC – minimum cell SOC value for resistance calculation;
98 98  * Maximum SOC – maximum cell SOC value for resistance calculation.
99 99  
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).
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="H3.4.1Celldefaults"]]). 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).
101 101  
102 -=== Cell balancing ===
96 +== 3.4.4 Cell balancing ==
103 103  
104 104  The BMS Main 2.x supports two cell balancing algorithms:
105 105  
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121 121  * the voltage on the cell is higher than the starting voltage of the balancing;
122 122  * the difference between the cell voltage and the minimum voltage among the cells of the battery is greater than the balancing threshold.
123 123  
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"]]).
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="H3.6.18Logichightemperatureprotection"]]).
125 125  
126 126  To change the cell balancing parameters, select the menu "Cell → Cell balancing":
127 127  
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142 142  * Start cell discharging – a command to start forced balancing of all battery cells (used for service purposes);
143 143  * Stop cell discharging – a command to stop forced balancing of all battery cells (used for service purposes).
144 144  
145 -=== Series balancing ===
139 +== 3.4.5 Series balancing ==
146 146  
147 147  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.
148 148  
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.
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.
150 150  
151 151  When charging the battery, balancing is performed based on the voltage of the series. A balancing resistor is connected to the cell series if:
152 152  
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168 168  * Coulomb threshold – the difference of the charges Qthr, given by a series of cells, above which balancing to be started, Ah;
169 169  * Period – period to reset of charge counters for each series (to avoid accumulation of error), second.
170 170  
171 -=== Cell analysis ===
165 +== 3.4.6 Cell analysis ==
172 172  
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.
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="H3.4.2SOCestimation"]]), which is necessary for calculating the state of charge of the battery.
174 174  
175 175  The BMS Main 2.x board can automatically determine the battery discharge characteristic.
176 176  
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231 231  * OCV – cell voltage Uocv, V;
232 232  * Resistance – cell resistance, Ohm.
233 233  
234 -=== Charge current map ===
228 +== 3.4.7 Charge current map ==
235 235  
236 236  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.
237 237  
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254 254  
255 255  Charging current limit = Maximum charging current × Kcs × Kcc × Kcv × Kct.
256 256  
257 -=== Discharge current map ===
251 +== 3.4.8 Discharge current map ==
258 258  
259 259  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.
260 260  
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278 278  
279 279  Discharging current limit = Maximum discharging current × Kds × Kdc × Kdv × Kdt.
280 280  
281 -=== SOC correction ===
275 +== 3.4.9 SOC correction ==
282 282  
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"]]).
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="H3.4.2SOCestimation"]]).
284 284  
285 285  To configure parameters for periodically correcting the battery state of charge, select the menu "Cells → SOC correction":
286 286