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Changes for page 3.3 Control

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8 8  
9 9  To change the common BMS settings, select the "Control → Common settings" section:
10 10  
11 -[[image:1733746733473-873.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="124" width="800"]]
11 +[[image:1740394523706-519.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="127" width="800"]]
12 12  
13 13  In this section:
14 14  
... ... @@ -16,13 +16,18 @@
16 16  * Cell resistance – nominal (maximum) internal resistance of the cell, Ohm;
17 17  * Relax time (after charging) – a relaxation time after charging, second;
18 18  * Relax time (atfer discharging) – the relaxation time after discharging, second;
19 -* Number of cycles – a number of charge-discharge cycles;
20 20  * Reset parameters– a command to reset cells state of charge, capacity, and resistance.
21 21  
22 -The values “Capacity”, “Resistance”, “Cycles” are used to calculate the SOC of cells and the battery.
21 +The values “Capacity” and “Resistance” are used to calculate the SOC of cells and the battery.
23 23  
24 24  The values of “Relax time” are used to determine the state of the battery. If the battery is in a state of relaxation, the system recalculates the voltage on the cells to the state of charge of the battery.
25 25  
25 +The “Reset parameters” will reset:
26 +
27 +* state of charge (new cell SOC values will be calculated based on cell voltage and “Uocv (open-circuit voltage) table”: in the “Control → SOC estimation” section);
28 +* cell resistance to “Cell resistance” value;
29 +* battery capacity to “Cell capacity” value.
30 +
26 26  The “Reset parameters” command is used for starting-up and adjustment of the battery.
27 27  
28 28  === SOC estimation ===
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44 44  * Current and voltage (simplified);
45 45  * Current and voltage (enhanced);
46 46  
47 -The SOC calculation algorithm for voltage calculates cells SOC based on the tabular dependence Uocv = Uocv(SOC, t °C).
52 +The **“Voltage”** SOC calculation algorithm calculates cells SOC based on the tabular dependence Uocv = Uocv(SOC, t °C).
48 48  
49 -The SOC calculation algorithm “Current and voltage (simplified)” works as follows:
54 +The **“Current and voltage (simplified)”** SOC calculation algorithm works as follows:
50 50  
51 51  * if I = 0, the battery is in a state of relaxation and the cell voltage Uocv is outside the [U,,ocv[point 1],,; U,,ocv[point 2],,], the SOC calculation based on the tabular dependence Uocv = Uocv(SOC, t °C);
52 52  * in any other cases, the SOC value is proportional to the charge (coulomb) passed through the battery (current time integral).
53 53  
54 -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).
59 +The **“Current and voltage (enhanced)” **SOC calculation algorithm 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).
55 55  
56 56  To change the algorithm for calculating the Final SOC, select the "Control → SOC estimation → Final SOC" section:
57 57  
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60 60  The following battery Final SOC calculation methods are supported:
61 61  
62 62  * Minimal SOC – SOC of the modular battery is assumed to be the minimum SOC among the battery modules;
63 -* Average SOC – SOC of the modular battery is taken equal to the arithmetic average of the SOC of the battery modules.
68 +* Average SOC – SOC of the modular battery is taken equal to the arithmetic average of the SOC of the battery modules;
69 +* Min-Max SOC – the battery SOC is calculated based on the minimum and maximum SOC of the cells. Final SOC will be a) 100% if any cell has 100% SOC, b) 0% if any cell has 0% SOC;
70 +* Max-Min SOC – the battery SOC is calculated based on the minimum and maximum SOC of the cells. Final SOC will be a) 100% if all cells have 100% SOC, b) 0% if all cells have 0% SOC.
64 64  
65 -To change other settings of SOC estimation, select the "Control → SOC estimation” section:
72 +Other parameters:
66 66  
67 -[[image:1733746733479-261.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="165" width="800"]]
68 -
69 -In this section:
70 -
71 71  * Scale the final SOC – a flag to scale the battery SOC by the following values;
72 -* SOC corresponding to 0% – battery SOC that sets to be 0%;
73 -* SOC corresponding to 100% – battery SOC that sets to be 100%.
75 +* SOC corresponding to 0% – the battery SOC that sets to be 0%;
76 +* SOC corresponding to 100% – the battery SOC that sets to be 100%.
74 74  * Uocv (open-circuit voltage) table – the dependence of the cell open circuit voltage Uocv on SOC and the cell temperature (selected for specific batteries);
75 -
76 -[[image:1733746733480-919.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="484" width="800"]]
77 -
78 -* Linear zone: point 1 – starting point of the linear zone of Uocv dependence;
79 -* Linear zone: point 2 – ending point of the linear zone of Uocv dependence;
78 +* Linear zone - linear zone of the Uocv = Uocv(SOC, t°C) dependency, inside which the cell voltage changes insignificantly:
79 +** Linear zone: point 1 – starting point of the Uocv linear zone;
80 +** Linear zone: point 2 – ending point of the Uocv linear zone;
80 80  * Coulomb counting correction (temperature) – the dependence of battery capacity on temperature;
81 -
82 -[[image:1733746733481-286.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="160" width="800"]]
83 -
84 84  * Coulomb counting correction (cycles) – the dependence of battery capacity on the number of charge-discharge cycles.
85 85  
86 -[[image:1733746733482-538.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="161" width="800"]]
87 -
88 -
89 89  === SOC correction ===
90 90  
91 91  The BMS Mini device 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"]]).
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107 107  
108 108  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
109 109  
110 -R = (U-U,,ocv,,) / I,,stable,,,
105 +{{formula fontSize="SMALL" imageType="PNG"}}
106 +R = \frac{U-U_{ocv}}{I_{stable}}
107 +{{/formula}}
111 111  
112 112  where U is the cell voltage measured in the charge or discharge state, V; U,,ocv,, is the cell voltage measured in the state of relaxation (before switching to the state of charge or discharge); I,,stable,, – stabilized current through the cell in the state of charge or discharge.
113 113  
114 114  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
115 115  
116 -R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
113 +{{formula fontSize="SMALL"}}
114 +R = \frac{U_2-U_1}{I_{stable2}-I_{stable1}}
115 +{{/formula}}
117 117  
118 -(Q,,max,, is the maximum cell capacity),
117 +provided that
119 119  
120 -where U,,2,, is the voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, – the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.
119 +{{formula fontSize="SMALL"}}
120 +| I_{stable2}-I_{stable1} | > 0.2 × Qmax
121 +{{/formula}}
121 121  
123 +where Q,,max,, — the maximum cell capacity,U,,2,, — voltage on the cell at the moment when the stabilized current I,,stable2,, is flowing through it; U,,1,, — the voltage on the cell at the moment when the stabilized current I,,stable1,, flowing through it.
124 +
122 122  The stabilized current I,,stable,, = I, if during the stabilization time the instantaneous current I is in the range from 0.95 × I to 1.05 × I.
123 123  
124 124  To change parameters of the algorithm for calculating the cell resistance, select the "Control → Resistance estimation" section:
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135 135  
136 136  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 [[Common settings>>doc:||anchor="HCommonsettings"]]). 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).
137 137  
141 +=== Low SOC (signal) ===
142 +
143 +To change the parameters of the generation a signal about low battery level, select the "Control → Low SOC (signal)" section:
144 +
145 +[[image:1740396460923-423.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="141" width="800"]]
146 +
147 +In this section:
148 +
149 +* Enable – a flag to enable signal generation;
150 +* Minimum SOC, %;
151 +* Tolerant SOC, %;
152 +* Delay before setting the signal, second;
153 +* Delay before clearing the signal, second;
154 +* Lock – lock the signal until the device is reset.
155 +
156 +Signal generation conditions:
157 +
158 +* the battery SOC is less than the “Minimum SOC” value during the “Delay before setting the signal” time.
159 +
160 +Conditions for clearing the signal:
161 +
162 +* the battery SOC is greater than the “Tolerant SOC” during the “Delay before clearing the signal” time.
163 +
164 +(% class="box infomessage" %)
165 +(((
166 +The "Low SOC signal" is indicative and can be output to a discrete output or a power switch.
167 +)))
168 +
138 138  === Charge map ===
139 139  
140 140  The BMS Mini device calculates maximum allowable charge current values in respect to SOC, battery temperature, contactor temperature and cell voltage.
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