1) Simplest Li-Ion Charger using a single MOSFET If you don't have an auto cut-off, simply restrict the constant voltage input to 4.1 V. Temperature management or control for the battery may not be required if the input current is restricted to a value which does not cause warming of the battery.
#12v lipo battery monitor circuit full
Use an input supply which has a fixed current and fixed voltage output, as discussed above.So What does the Graph Basically Suggest? The supply must be automatically cut off as soon as the cell reaches 4.2 V level. Remember, although the graph shows the cell being charged even after it has reached 4.2 V, that's strictly not recommended during practical charging of a Li-Ion cell. Stage#4: In situations where the cell is not used for long periods, a topping up charging is applied from time to time, wherein the current consumed by the cell is below 3% of its Ah value. The SoC of a cell or battery is the optimal charge level which it has attained after a course of full charging, and this level shows the actual level which can be used for a given application.Īt this state we can say the cell condition is ready to use. The following graph suggests the ideal charging procedure of a standard 3.7 V Li-Ion Cell, rated with 4.2 V as the full charge level.Īfter one hour the cell voltage indicates the real State-Of-Charge or the SoC of the cell. The following explanation will help to understand this better. It's actually an extremely friendly form of battery, and will get charged with minimal considerations, although these minimal considerations are essential and must be followed without fail.Ī few critical but easy to implement considerations are: auto cut-off at the full charge level, constant voltage, and constant current input supply. Does Charging a Li-Ion Battery Require Complex Considerations?Ībsolutely not. In tropical summer conditions, even this rate can turn into an unfavorable rate for the battery due to the existing high ambient temperature. A 0.5C rate is therefore considered as a standard recommended value.Ġ.5C signifies a charging current rate that's 50% of the Ah value of the battery. Having said this, it is never advisable to use this extreme rate, as this would mean charging the battery at highly stressful conditions due to increase in its temperature. This is termed as charging at 1C rate, where C is the Ah value of the battery. Unlike, lead acid battery, a Li-Ion battery can be charged at significantly high initial currents which can as high as the Ah rating of the battery itself. Before learning the construction procedures of a li-Ion Charger, it would be important for us to know the basic parameters concerned with the charging Li-Ion battery.
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