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Changes for page 3.3 Control

Last modified by Admin on 2025/04/09 12:15
From version 10.2
edited by Admin
on 2025/02/24 11:29
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To version 7.1
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on 2025/02/24 10:59
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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 -{{formula fontSize="SMALL" imageType="PNG"}}
106 -R = \frac{U-U_{ocv}}{I_{stable}}
107 -{{/formula}}
105 +R = (U-U,,ocv,,) / I,,stable,,,
108 108  
109 109  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.
110 110  
111 111  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
112 112  
113 -{{formula fontSize="SMALL"}}
114 -R = \frac{U_2-U_1}{I_{stable2}-I_{stable1}}
115 -{{/formula}}
111 +R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
116 116  
117 -provided that
113 +(Q,,max,, is the maximum cell capacity),
118 118  
119 -{{formula fontSize="SMALL"}}
120 -| I_{stable2}-I_{stable1} | > 0.2 × Qmax
121 -{{/formula}}
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.
122 122  
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 -
125 125  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.
126 126  
127 127  To change parameters of the algorithm for calculating the cell resistance, select the "Control → Resistance estimation" section:
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138 138  
139 139  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).
140 140  
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 -
169 169  === Charge map ===
170 170  
171 171  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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