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Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 31.3
edited by Admin
on 2025/02/20 11:09
Change comment: There is no comment for this version
To version 33.1
edited by Admin
on 2025/02/20 11:12
Change comment: There is no comment for this version

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... ... @@ -73,24 +73,26 @@
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 -R = (U-Uocv) / Istable,
76 +{{formula fontSize="SMALL" imageType="PNG"}}
77 +R = \frac{U-U_{ocv}}{I_{stable}}
78 +{{/formula}}
77 77  
78 78  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.
79 79  
80 80  The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
81 81  
82 -R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,)
84 +{{formula fontSize="SMALL"}}
85 +R = \frac{U_2-U_1}{I_{stable2}-I_{stable1}}
86 +{{/formula}}
83 83  
84 84  provided that
85 85  
86 -~{~{formula fontSize="SMALL"}}
87 -~| I_{stable2}-I_{stable1} | > 0.2 × Qmax
88 -~{~{/formula}}
90 +{{formula fontSize="SMALL"}}
91 +| I_{stable2}-I_{stable1} | > 0.2 × Q_{max}
92 +{{/formula}}
89 89  
90 -(Q,,max,, is the maximum cell capacity),
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.
91 91  
92 -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 -
94 94  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.
95 95  
96 96  To change parameters of the algorithm for calculating the cell resistance, select the menu "Cells → Cell resistance estimation":