Skip to Content

Changes for page 3.4 Battery parameters

Last modified by Admin on 2025/04/09 12:04
From version 6.1
edited by Admin
on 2024/11/21 16:44
Change comment: Uploaded new attachment "1732207485773-804.png", version {1}
To version 6.3
edited by Admin
on 2024/11/21 16:45
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -93,7 +93,51 @@
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 ==
96 96  
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 +
97 97  == SOC correction ==
98 98  
99 99  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)).