Currently, drone batteries on the market mainly use lithium polymer batteries. When rechargeable lithium-ion batteries are connected in parallel, batteries with the same voltage and capacity and a small difference in internal resistance should be selected for connection. Before connection, each battery must be charged or discharged to the same voltage before connection. It is best to add an independent protection board to each battery. The purpose of connecting lithium-ion batteries in parallel is to increase capacity. Therefore, parallel charging of lithium-ion batteries also has different design characteristics compared to single-cell lithium-ion batteries, which is mainly reflected in the consistency of the charging current. parallel design and batteries. Compared with other batteries, lithium batteries have large capacity,high magnification rate and strong explosive power, which greatly improves the endurance and flight speed of drones. Due to the characteristics of lithium batteries and the fact that drone batteries are generally made of lithium battery packs connected in series and parallel, charging drone batteries requires a set of chargers with a complete circuit of load management. Typically a charger with a balanced circuit. the charging function is selected.
What will happen after the DJI battery has been cycled 1500 times?
The first is performance. The drone must overcome its own gravity to do the work. Hence, the weight requirements for the drone. Batteries are higher, and increasing the large capacity of the battery will cause the weight to increase. Therefore, only lighter lithium-ion polymer batteries with thethe same capacity can meet the needs. On the other hand, drones have particularly high demands on battery power. When you quickly switch from a hovering state, increase the throttle to maximum speed and the battery power will increase quickly, several times in a short time. Only lithium-ion polymer batteries can respond to such power changes. meet these requirements through series and parallel connection. Tes The car battery is composed of more than 7,000 18650 batteries connected in series and parallel, so it can withstand the instantaneous demand for high power, which is obviously not suitable for drones. Therefore, in terms of performance, only lithium-ion polymer batteries can meet such usage requirements.
Of course, even lithium-ion polymer batteries wear out very quickly on drones. A bat5,800mah battery in the DJI Phantom 4 can hold up to 89Wh of power, and a 20,000mah external battery can hold up to 89Wh of power. The energy is generally just over 70 Wh, and such a 5800 mAh battery can only support 30 minutes of flight time. You can imagine the strain it puts on the battery when lithium-ion polymer batteries are used in this type of working environment. for a long time, the battery wears out very quickly and the battery life is short. Rapid discharge over a period of time will also cause the battery temperature to rise rapidly, causing the drone batteries to require additional safety protection.
DJI drone batteries are all called intelligent flight batteries because in addition to the lithium-ion polymer battery, the battery also has more components. First of all, in order to protectBattery safety for long-term operation, the power management system can protect the battery from charging and discharging, so that the battery can always operate within a safe range. left fully charged for a long time will impact battery life. DJI Smart Battery has built-in battery self-discharge protection, which can automatically discharge when left out for a long time, thereby extending battery life. This set of technologies, a bit like a lighter version of Tesla's energy management system.
Therefore, whether from a performance or safety perspective, the requirements for batteries used by drones are higher than regular batteries, which also makes them expensive.
Scrap metal. Lithium batteries have a cyclical lifespane. Repeated cycling will cause capacitance to decrease and internal resistance to increase. As long as it reaches 200 cycles, the battery will be discarded. Electric batteries are very sensitive to internal resistance. High discharge batteries like DJI not only have a low number of cycles, but also being fully charged or exhausted for a long time will seriously affect the battery life.