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Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 29.1
edited by Admin
on 2025/02/17 17:28
Change comment: There is no comment for this version
To version 32.1
edited by Admin
on 2025/02/20 11:11
Change comment: There is no comment for this version

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... ... @@ -48,6 +48,8 @@
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;
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%.
... ... @@ -71,18 +71,26 @@
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  
74 -R = (U-Uocv) / Istable,
76 +{{formula fontSize="SMALL" imageType="PNG"}}
77 +R = \frac{U-U_{ocv}}{I_{stable}}
78 +{{/formula}}
75 75  
76 76  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.
77 77  
78 78  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
79 79  
80 -R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
84 +{{formula fontSize="SMALL"}}
85 +R = \frac{U_2-U_1}{I_{stable2}-I_{stable1}}
86 +{{/formula}}
81 81  
82 -(Q,,max,, is the maximum cell capacity),
88 +provided that
83 83  
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.
90 +{{formula fontSize="SMALL"}}
91 +| I_{stable2}-I_{stable1} | > 0.2 × Qmax
92 +{{/formula}}
85 85  
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 +
86 86  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.
87 87  
88 88  To change parameters of the algorithm for calculating the cell resistance, select the menu "Cells → Cell resistance estimation":
... ... @@ -134,7 +134,7 @@
134 134  
135 135  To change the cell balancing parameters, select the menu "Cell → Cell balancing":
136 136  
137 -[[image:1732207485773-804.png||data-xwiki-image-style-alignment="center" data-xwiki-image-style-border="true" height="264" width="387"]]
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"]]
138 138  
139 139  In this section:
140 140  
... ... @@ -146,8 +146,13 @@
146 146  ** Charging;
147 147  ** Charging or relaxed;
148 148  ** 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;
149 149  * Minimum cell voltage to start balancing, V;
150 -* Balancing threshold, 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;
151 151  * Start cell discharging – a command to start forced balancing of all battery cells (used for service purposes);
152 152  * Stop cell discharging – a command to stop forced balancing of all battery cells (used for service purposes).
153 153