The Right Way to Charge Your Lithium Battery Pack
1 What’s the normal way of charging
In this paper several methods can significantly extend the battery life of the lithium-ion battery charging and discharging.
2 lithium batteries Components
3 lithium battery charging principle
Better lithium-ion batteries to the battery charging method is to provide a constant current of ± 1% pressure limiting, until the battery is fully charged and stop charging. Charging voltage should be less than the maximum voltage can usually be set to 4.1V; the charge current ranges from c/2 to 1C for 2.5 to 3 hours. You can also use a lower charging current, but will take longer. Monitor the charging currentand charging. With the battery charging voltage rise, and when the charging voltage is reached the battery voltage, charging current began to decline. Current startfalling, about charging to the battery capacity of 50% to 60%. Charging voltage continued until the charging current down to a low enough level, usually selected to terminate current between the c–10 to C/20, then about charging to the battery capacity of 92% to 99%, terminate the charging cycle.
4 the correct lithium-ion battery charging method
Current lithium batteries usually have a misunderstanding, and one-sided pursuit of batteries work longer hours, so that the batteries close to 100%. This approach in the long term without maximize the use of lithium-ion batteries. Most of the lithium-ion battery manufacturer set a 4.2V charge voltage, use this as the optimal balance between capacity and cycle life. 4.2V as constant charging voltage, the battery provides about 500 charge/discharge cycles, and battery capacity to 80%. Figure 2 shows the recommended charge voltage and decreasing charge voltage comparisons.
You can see from Figure 2, in order to avoid 100% of lithium batteries to capacity can be extended lithium-ion battery life to a great extent. Reduce the charging voltage will increase cycle life and service life, at the cost of reduced battery capacity.Studies have shown that the charging voltage from 100mV to 300mV cycles life expectancy can be 2 to 5 times or more. Select the appropriate charge termination current. Select a minimum charging current termination (C/10 or C/x) charger, not charged to capacity through 100%, or you can extend battery life. Many Chargers have to be able to function for extended battery life, and sometimes you can extend battery life significantly. Battery charger for extended battery life is mainly determined by the charger the charging voltage and charging termination of current decisions. C/10 terminates the charging current is only about charging the battery to its volume of 92%, but will increase cycle life of lithium batteries. Not recommended for continuous voltage after the battery is fully charged and the battery still because it will speed up
Some lithium-ion battery charger allows you to use thermistor monitoring the battery temperature. The main purpose of doing so is, if the battery temperature is outside the recommended range from 0 ℃ to 40 ℃ window, that prohibit charging to prevent damage caused by battery overheating.
In short, wants people to concern about the capacity of the lithium-ion battery, into the lithium-ion battery life concerns. Although many factors influence the lithium-ion battery life, but with the suitable charging mode to extended lithium-ion battery life plays a big role. The right way is to use a lower charge voltage, the appropriate charging termination current.