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Changes for page 3.4 Battery parameters

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63 63  
64 64  == 3.4.3 Cell resistance estimation ==
65 65  
66 -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
66 +== ==
67 67  
68 -R = (U-Uocv) / Istable,
69 -
70 -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.
71 -
72 -The second method is used for a stepwise change in the current through the cell, while the value of the cell resistance:
73 -
74 -R = (U,,2,,-U,,1,,) / (I,,stable2,,-I,,stable1,,) provided that | I,,stable2,,-I,,stable1,, | > 0.2 × Q,,max,,
75 -
76 -(Q,,max,, is the maximum cell capacity),
77 -
78 -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.
79 -
80 -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.
81 -
82 -To change parameters of the algorithm for calculating the cell resistance, select the menu "Cells → Cell resistance estimation":
83 -
84 84  == SOC correction ==
85 85  
86 86  The BMS Main 2.x board can recalculate the battery SOC after long-term storage or after long-term working in the case when the battery was not charged fully or discharged totally. Recalculation is done based on the tabular dependency Uocv = Uocv (SOC, t) (see section Calculating the state of charge (SOC)).
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