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Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 6.3
edited by Admin
on 2024/11/21 16:45
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To version 6.1
edited by Admin
on 2024/11/21 16:44
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93 93  
94 94  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 section Cell defaults). 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).
95 95  
96 -== 3.4.4 Cell balancing ==
97 97  
98 -The BMS Main 2.x supports two cell balancing algorithms:
99 -
100 -* balancing stacks individually;
101 -* balancing the entire battery (used by default).
102 -
103 -Balancing stacks individually balances the voltage within a group of cells that are connected to the same BMS Logic board. **It is not recommended to use this algorithm in typical battery designs**.
104 -
105 -Balancing the entire battery makes the voltage of all cells be equal to the minimum cell voltage.
106 -
107 -The following balancing rules are supported:
108 -
109 -* only when the battery is charging (current I > 0);
110 -* when the battery is charging (current I > 0) or when the battery is in a state of relaxation;
111 -* always (regardless of battery state).
112 -
113 -A balancing resistor is connected to the cell if:
114 -
115 -* the voltage on the cell is higher than the starting voltage of the balancing;
116 -* the difference between the cell voltage and the minimum voltage among the cells of the battery is greater than the balancing threshold.
117 -
118 -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).
119 -
120 -To change the cell balancing parameters, select the menu "Cell → Cell balancing":
121 -
122 -[[Cell balancing settings>>image:1732207485773-804.png||data-xwiki-image-style-alignment="center" height="264" width="387"]]
123 -
124 -In this section:
125 -
126 -* Enable – a flag to enable cell balancing;
127 -* Algorithm – a balancing algorithm:
128 -** Balancing stacks individually;
129 -** Balancing the entire battery;
130 -* Constrain (rule):
131 -** Charging;
132 -** Charging or relaxed;
133 -** Always (regardless of battery state);
134 -* Minimum cell voltage to start balancing, V;
135 -* Balancing threshold, V;
136 -* Start cell discharging – a command to start forced balancing of all battery cells (used for service purposes);
137 -* Stop cell discharging – a command to stop forced balancing of all battery cells (used for service purposes).
138 -
139 -== 3.4.5 Series balancing ==
140 -
141 141  == SOC correction ==
142 142  
143 143  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)).