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Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 33.1
edited by Admin
on 2025/02/20 11:12
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To version 28.1
edited by Admin
on 2025/02/17 17:20
Change comment: Загрузить новое вложение 1739812799920-892.png

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... ... @@ -48,8 +48,6 @@
48 48  * Final SOC – a method of calculating the battery SOC:
49 49  ** Minimum cell SOC – the battery SOC is assumed to be equal to the minimum SOC of cells;
50 50  ** Average cell SOC – the battery SOC is assumed to be equal to the average SOC of cells;
51 -** 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;
52 -** 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;
53 53  * Scale the final SOC – flag to scale the battery SOC by the following values;
54 54  * Internal SOC corresponding to 0% – battery SOC that sets to be 0%;
55 55  * Internal SOC corresponding to 100% – battery SOC that sets to be 100%.
... ... @@ -73,26 +73,18 @@
73 73  
74 74  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
75 75  
76 -{{formula fontSize="SMALL" imageType="PNG"}}
77 -R = \frac{U-U_{ocv}}{I_{stable}}
78 -{{/formula}}
74 +R = (U-Uocv) / Istable,
79 79  
80 80  where U is the cell voltage measured in the charge or discharge state, V; Uocv is the cell voltage measured in the state of relaxation (before switching to the state of charge or discharge); Istable – stabilized current through the cell in the state of charge or discharge.
81 81  
82 82  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
83 83  
84 -{{formula fontSize="SMALL"}}
85 -R = \frac{U_2-U_1}{I_{stable2}-I_{stable1}}
86 -{{/formula}}
80 +R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
87 87  
88 -provided that
82 +(Q,,max,, is the maximum cell capacity),
89 89  
90 -{{formula fontSize="SMALL"}}
91 -| I_{stable2}-I_{stable1} | > 0.2 × Q_{max}
92 -{{/formula}}
84 +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.
93 93  
94 -where Q,,max,, is the maximum cell capacity; 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.
95 -
96 96  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.
97 97  
98 98  To change parameters of the algorithm for calculating the cell resistance, select the menu "Cells → Cell resistance estimation":
... ... @@ -131,20 +131,11 @@
131 131  * the voltage on the cell is higher than the starting voltage of the balancing;
132 132  * the difference between the cell voltage and the minimum voltage among the cells of the battery is greater than the balancing threshold.
133 133  
134 -A balancing resistor is disconnected from the cell if any of the following conditions are met:
135 -
136 -* the voltage on the cell is less than the balancing stop voltage;
137 -* the difference between the voltage on the cell and the minimum voltage among the battery cells is less than the balancing stop threshold.
138 -
139 139  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:Battery management systems.BMS Main 2\.1.3\. Configuration.3\.6 Battery protection.WebHome||anchor="HLogichightemperatureprotection"]]).
140 140  
141 -The BMS Main 2.1 can enable the cell balancing by the external “Balancing request” signal. Balancing process will be started to cells which the voltage is higher than the balancing start voltage and the difference between the cell voltage and the minimum voltage among all the cells is greater than the balancing stop threshold.
142 -
143 -BMS Main 2.1 can force a cell balancing, if its voltage is higher than estimated value.
144 -
145 145  To change the cell balancing parameters, select the menu "Cell → Cell balancing":
146 146  
147 -[[image:1739812799920-892.png||alt="1732207485773-804.png" data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="264" width="387"]]
128 +[[image:1732207485773-804.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="264" width="387"]]
148 148  
149 149  In this section:
150 150  
... ... @@ -156,13 +156,8 @@
156 156  ** Charging;
157 157  ** Charging or relaxed;
158 158  ** Always (regardless of battery state);
159 -* Balancing condition:
160 -** Automatic – balancing will be performed automatically if needed conditions are met;
161 -** On balancing request – balancing will start only if a remote request is received. In this case cells will start to balance regardless the "Voltage deviation to start balancing" value;
162 162  * Minimum cell voltage to start balancing, V;
163 -* Deviation to start balancing;
164 -* Deviation to stop balancing;
165 -* Voltage for forced balancing – if cell voltage is above this value, it will start discharging through balancing resistor;
141 +* Balancing threshold, V;
166 166  * Start cell discharging – a command to start forced balancing of all battery cells (used for service purposes);
167 167  * Stop cell discharging – a command to stop forced balancing of all battery cells (used for service purposes).
168 168