Most specialized aircraft model lithium-ion battery charging integrated circuits 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). When the battery cell voltage is 3.0V or lower during the pre-charge step, the battery is charged at a low speed. This restores the passivation layer, which can be fully discharged during long-term storage. It also prevents the 1C charge rate from overheating when a partial copper breakdown occurs on a battery anode shorted out by excessive discharge.
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1, when the lithium-ion battery voltage reaches 3.0V, the charger enters the CC step
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The fast charging current is usually limited to a speed of 0.5C to 1C to prevent overheating and therefore deterioration. When the aeroplane lithium-ion battery is fully charged, the charger begins to control the battery voltage, and the charging current drops sharply to a predetermined end level when it enters the CV level. In order to prevent long charging of dead batteries, it is usually necessary to quickly charge a safety timer. Even if the battery does not reach the shutdown current, the battery charger must be turned off at the end of the safe time.
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2, battery capacity is a function of battery voltage
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In general, the higher the voltage of a model aircraft lithium-ion battery, the greater the battery capacity. However, the higher the battery charging voltage, the shorter the battery life. When the battery voltage is high, the battery cathode material reacts faster with the electrolyte, and the cobalt material is permanently lost during the chemical reaction. As a result, the available energy storage materials are reduced, resulting in a loss of the battery's chemical capacity. Therefore, the accuracy of the battery charging voltage is very important.
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3, time is an important factor in battery charging
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In the constant current state, 70% of the total capacity of the rechargeable battery is about 30% of the charging time, while the charging time in the constant voltage state is only 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.
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4, the charging current shall not exceed the maximum charging current specified in the specification, the use of higher than the recommended current charging may cause the battery's charge and discharge performance, mechanical properties and safety performance problems, and may lead to heating or leakage. At present, the 5C current charging aircraft model lithium-ion battery on the market is recommended not to use 5C often to charge, so as not to affect the battery life.
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5, charging voltage: the charging voltage shall not exceed the specified limit voltage (4.2V\/ single battery), 4.25V for each section of the maximum limit of charging voltage.
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6, charging temperature: lithium-ion batteries must be charged within the ambient temperature range specified in the product specification, otherwise the battery is vulnerable to damage. When the surface temperature of the battery is abnormal, stop charging immediately.
1. Choose the right charger: Model aircraft lithium batteries need to use a special charger to charge, generally divided into constant current charging and constant voltage charging two ways, need to choose the right charger according to the battery type and charging requirements.
2. Connect the charger: Connect the output line of the charger to the battery, pay attention to the connection of the positive and negative terminals. Generally, red is the positive terminal, and black is the negative terminal.
3. Set charging parameters: Set the voltage and current parameters of the charger according to the battery type and charging requirements. Generally, the charger will have a corresponding indicator indicating the charging status.
4. Start charging: Press the \"Start\" button on the charger to start charging. During the charging process, pay attention to the temperature change of the battery. If the battery temperature is too high, stop charging immediately.
5. Charging completion: When the charger indicator shows charging completion, it means that the battery is full, and the output line of the charger should be unplugged in time to avoid battery damage caused by overcharging.
6. Storage of batteries: Fully charged model aircraft lithium batteries should be stored in a dry, cool place to avoid long-term exposure to sunlight or high temperature environment. If the battery is not used for a long time, it should be discharged and charged regularly to keep the battery active.
Model aircraft lithium battery is currently a more commonly used battery type, generally using a charger to charge. Common aircraft model lithium batteries are lithium-ion batteries (Li-ion), polymer lithium batteries (Li-polymer) and so on.
Model aircraft lithium battery charging method is as follows:
1. Choose the right charger: Choose a charger that can support the aircraft model lithium battery charging, should choose a brand specific charger, do not choose a low-quality charger, otherwise safety accidents will occur.
2. Correct wiring: When charging the battery, the incoming and outgoing wires should be correctly connected. For people who are not familiar with the principles of electricity, we must not easily destroy the circuit.
3. Charging current: According to the battery manual, choose the correct charging current, not too high or too low.
4. Charging time: The charging time should be carried out in accordance with the time specified in the charger manual and manual, and should not exceed the specified time. To be on the safe side, do not leave while charging, and do not leave the charger working continuously at night.
5. Prevent overcharging of the battery: During the charging process, attention should be paid to the battery to avoid overcharging. Once the battery is fully charged, disconnect the power supply immediately to prevent the battery from overcharging and causing an accident.
6. Prevent overdischarge of the battery: When using the battery, excessive discharge should be avoided, especially if the battery cannot be used continuously for a long time to avoid battery damage and damage the battery life.
It should be noted that when charging, be sure to follow the instructions of the charger and the battery, and cannot be used at will to prevent the battery from overcharging or over-discharging. At the same time, be sure to charge in a safe place to avoid accidents.