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Changes for page 3.3 Control

Last modified by Admin on 2025/04/09 12:15
From version 7.1
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on 2025/02/24 10:59
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To version 11.1
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on 2025/02/24 11:31
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102 102  
103 103  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
104 104  
105 -R = (U-U,,ocv,,) / I,,stable,,,
105 +{{formula fontSize="SMALL" imageType="PNG"}}
106 +R = \frac{U-U_{ocv}}{I_{stable}}
107 +{{/formula}}
106 106  
107 107  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.
108 108  
109 109  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
110 110  
111 -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}}
112 112  
113 -(Q,,max,, is the maximum cell capacity),
117 +provided that
114 114  
115 -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}}
116 116  
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 +
117 117  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.
118 118  
119 119  To change parameters of the algorithm for calculating the cell resistance, select the "Control → Resistance estimation" section:
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130 130  
131 131  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).
132 132  
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 +
133 133  === Charge map ===
134 134  
135 135  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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