What factors should be paid attention to for low temperature flying lithium battery of UAV?

The low temperature flying lithium battery of drones should pay attention to the winter. When the temperature is low, the drone is prone to problems such as voltage drop and insufficient flight power during the flight, which can easily cause the drone to crash and explode. So, what should be paid attention to when driving drones in winter? The author has compiled some suggestions from netizens for your reference only. Most of the power for drone flight is supplied by lithium batteries, and low temperature will impair the performance of lithium batteries. When the battery is exposed below 15°C, the chemical activity of the battery is significantly reduced, and the increase of its internal resistance leads to a decrease in the discharge capacity, and the voltage drop increases during discharge. There are two risks for a sharp drop in voltage (a single battery is less than 3V). Second, the battery will automatically shut down to prevent over-discharge of the battery. This is a common problem of lithium batteries, and there is no perfect solution. The smartphones, tablets and other smart devices we use will also turn off at low temperatures. What we want to mention here is the flying principle of the drone's lithium battery. Regarding drones with a heavier weight, more current is required to maintain power. The air cushion continues to fly, such as a full throttle climb, the battery will continue to discharge high current; in plateau areas, where the air is thin and the air pressure is low, the aircraft needs higher motor speed to maintain power, and the battery output current will be further increased. The above conditions, coupled with the low temperature in winter, make the voltage drop of the battery further increase; in severe cases, it may even cause the battery to shut down. Due to the lack of voltage, this will constitute a power failure and the crash of the aircraft. The schematic diagram of the discharge voltage curve of DJI Spirit 3 lithium battery under different temperature conditions is shown in the figure. The lower the battery temperature, the lower the battery voltage after takeoff. After the battery temperature rises, the voltage gradually returns to normal. If a low battery takes off, the battery startup voltage is low at this time. As the temperature of the battery body is low, the voltage will be quickly pulled down, which greatly increases the risk of insufficient voltage. This is why we always fly at full load. Recommendations for battery use in winter: In response to the above problems, we recommend the following measures: 1. Before flying, make sure that the battery is fully charged to ensure that the battery is in a high voltage state. 2. Fully preheat the battery to above 25 degrees to reduce the internal resistance of the battery. It is recommended to use a battery preheater to preheat the battery. 3. Hover for about 1 minute after takeoff to make the battery heat up, fully preheat itself, and reduce the battery's internal resistance. The value of the drone is relatively high. It may hurt the aircraft when it falls, and may hurt people when it is heavy. Flying in winter, flight safety is the top priority. 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: Analyze the calculation formula of common lithium battery parameters