How to charge the lithium battery of aeromodelling

Most dedicated aeromodelling lithium battery charging integrated circuits charge the battery in this way. There are three charging methods for HM lithium batteries: pre-charging, fast charging, constant current (CC) and constant voltage (CV). When the battery cell voltage is 3.0V or lower in the precharging step, the battery is charged at a low speed. This restores the passivation layer, which can be completely discharged during long-term storage. When a partial copper breakdown occurs on the anode of a battery that is short-circuited by excessive discharge, it can also warn of overheating at a 1C charging rate. 1. When the voltage of the lithium battery reaches 3.0V, the charger enters the CC step and the fast charging current is usually limited to a speed of 0.5C to 1C to guard against overheating and deterioration. The speed must be adjusted so that the battery temperature does not exceed 45°C. The battery is charged at high speed until the battery reaches the voltage regulation limit (4.2V/cell for cathode batteries based on LiCoO2 and 4.4V for anode coupled batteries based on LiCoO2) Yes. When the model airplane lithium battery is fully charged, the charger starts to control the battery voltage, and when entering the CV level, the charging current drops sharply to a predetermined end level. To guard against charging dead batteries for a long time, a quick charge safety timer is usually required. Even if the battery does not reach the shutdown current, the battery charger must be closed after the safe time is over. 2. The battery capacity is a function of the battery voltage. Generally, the higher the voltage of the RC lithium battery, the larger 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. Therefore, the available energy storage materials are reduced, resulting in a loss of the battery's chemical capacity. Charging at 4.3V initially can add about 10% of additional capacity, but the battery life is halved. On the other hand, if the battery is not overflowing, the battery capacity will decrease. When the battery is charged at a voltage of 40mV, about 8% of the total capacity will be reduced. Therefore, the accuracy of the battery charging voltage is very important. 3. Time is an important factor for battery charging. In the constant current state, 70% of the total capacity of the rechargeable battery requires about 30% of the charging time, while in the constant voltage state, the charging time only accounts for about 70% of the charging time. This is because of the resistance inside the battery. The lower the internal resistance of the battery, the shorter the battery charging time. The charging current rate of the newly added battery is not an effective way to shorten the charging time of the battery. The charging time can be shortened in the constant current state, but the charging time is increased in the constant voltage state. Therefore, shortening the total charging time is very small. On the other hand, when the battery current rate is 1C or higher, the life of the lithium battery is affected. Note that the above is only a description of the charging methods of some lithium batteries, for reference only. In addition, the model aircraft battery charging does not have to be so troublesome. Just follow the manufacturer's instructions, beware of overcharging, and ask someone to guard the charging and take protective measures. 4. The charging current must not exceed the maximum charging current specified in the specification (usually 0.5~1.0C or below). Charging with a current higher than the recommended current may cause problems with battery charging and discharging performance, mechanical performance and safety performance. And may cause heat generation or leakage. Currently on the market, 5C current rechargeable lithium batteries for aeromodelling, it is recommended not to use 5C charging frequently, so as not to affect the battery life. 5. Charging voltage: The charging voltage shall not exceed the specified limit voltage (4.2V/single battery), 4.25V is the highest limit of the charging voltage for each cell. 6. Charging temperature: The lithium battery must be charged within the ambient temperature range specified in the product specification, otherwise the battery is easily damaged. When the surface temperature of the battery is found to be abnormal, the charging should be stopped immediately. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Which is better for low-temperature lithium battery?