Most special model aircraft lithium battery charging ics charge the battery in this way. Model aircraft lithium-ion batteries are charged in three ways: pre-charge, fast-charge constant current (CC) and constant voltage (CV). If the voltage of the battery module is 2.5V or lower during the pre-charge step, the battery should be charged at a low speed. This restores the passivation layer, which can be fully discharged during long-term storage. If part of the copper penetration occurs on the battery anode where the excessive discharge shorted, overheating of the 1C charging speed can also be avoided.
1, when the lithium battery voltage reaches 2.5V, the charger enters the CC step
The fast current is usually controlled at a speed of 0.5C to 1C to avoid overheating and deterioration. When the model plane lithium battery is fully charged, the charger begins to control the battery voltage, and when it enters the CV level, the current drops sharply to the predetermined end level. In order to avoid long-term charging of dead batteries, a fast charge safety timer is usually required. Even if the battery does not reach the shutdown current, the battery charger must be turned off after the end of the safe time.
2, battery power is the function of battery voltage
In general, the higher the voltage of the aircraft model lithium battery, the greater the battery power. However, the higher the battery charging voltage, the shorter the battery life. When the battery voltage is high, the battery cathode material reacts quickly with the electrolyte, and the cobalt equipment is permanently lost in the process of chemical change. As a result, the available energy storage materials are reduced, resulting in a loss of battery chemical capacity. Therefore, the accuracy of the battery charging voltage is very important.
3, the key factor of battery charging is time
The total capacity of the rechargeable battery under constant current conditions is 70% or 30% of the charging time, but in the case of stable voltage, the charging time only accounts for about 70% of the charging time. This is because there is resistance inside the battery. The lower the internal resistance of the battery, the shorter the battery charging time.
4, the current shall not exceed the maximum current specified in the specification.
Charging with higher than the recommended current may cause problems with the battery‘s charge-discharge performance, mechanical properties, and safety factor, and may lead to heating or leakage. For the 5C current charging model lithium batteries currently on the market, it is recommended not to use 5C often to charge, so as not to affect the battery life.
5. Charging voltage:
The charging voltage shall not exceed the specified limit voltage (4.2)V/ cell), 4.25V is the maximum limit of each charging voltage.
6. Charging temperature:
Lithium batteries must be charged within the ambient temperature range specified in the product specifications, otherwise it is easy to damage the battery. When the surface temperature of the battery is abnormal, stop charging immediately.
Due to the size and flight time, the aviation model is very demanding for the use of batteries and uses series lithium batteries. Balanced charging events connected lithium batteries to achieve relative balance, improve the service life of lithium-ion batteries, minimum charging time to achieve maximum energy, increase the battery in the use of electricity time.