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Composition of aviation model lithium-ion battery charger

The composition of a general aviation model lithium-ion battery charger: power supply; Charger; Charger and charging board; Other accessories. The aircraft model lithium-ion battery balance charger generally has a power supply and charger to charge the aircraft model lithium-ion battery, while the charging plate and other accessories are designed to make the charger charge more safely and quickly.

Lithium ion battery charger is a charger specifically designed for charging lithium-ion batteries. Lithium ion batteries have high requirements for chargers, which require circuit protection. Therefore, lithium-ion battery chargers usually have high control precision and can charge lithium-ion batteries with constant current and voltage.

Charging method for aviation model lithium-ion batteries

Most specialized aircraft model lithium-ion battery charging integrated circuits charge the battery in this way. There are three charging methods for aircraft model lithium-ion batteries: pre charging, fast charging with constant current (CC), and constant voltage (CV). When the battery cell voltage is 3.0V or lower during the pre charging step, the battery is charged at low speed. This restores the passivation layer, which can be fully discharged during long-term storage. When partial copper breakdown occurs on the anode of a battery with excessive discharge short circuit, it can also prevent overheating of the 1C charging rate.

1. When the voltage of the lithium-ion battery reaches 3.0V, the charger enters the CC step

The fast charging current is usually limited to a speed of 0.5C to 1C to prevent overheating and deterioration. When the lithium-ion battery of the aircraft model is fully charged, the charger begins to control the battery voltage, and when it enters the CV level, the charging current drops sharply to the predetermined end level. To prevent long-term charging of dead batteries, a fast charging safety timer is usually required. Even if the battery has not reached the shutdown current, the battery charger must be turned off after the safety time has ended.

2. Battery capacity is a function of battery voltage

Usually, the higher the voltage of the lithium-ion battery for aircraft models, the larger the battery capacity. However, the higher the charging voltage of the battery, the shorter its lifespan. When the battery voltage is high, the positive electrode material of the battery reacts faster with the electrolyte, and the cobalt material is permanently lost during the chemical reaction. Therefore, the available energy storage materials are reduced, resulting in a loss of chemical capacity in the battery. Therefore, the accuracy of battery charging voltage is very important.

3. Time is an important factor in battery charging

In a constant current state, 70% of the total capacity of a rechargeable battery requires 30% of the charging time, while in a constant voltage state, 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 charging time of the battery.

4. The charging current shall not exceed the maximum charging current specified in the specifications. Charging with a current higher than the recommended current may cause issues with the battery's charging and discharging performance, mechanical performance, and safety performance, and may also result in heating or leakage. It is recommended not to frequently use 5C current charging for aircraft model lithium-ion batteries currently sold in the market to avoid affecting battery life.

5. Charging voltage: The charging voltage shall not exceed the specified limit voltage (4.2V/individual battery), with 4.25V being the highest limit of charging voltage for each battery.

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