Lithium Ion Polymer Battery Introduction

Time:2019-11-05 15:50:06

Lithium Ion Polymer Battery Introduction



Ⅰ. The components of Drone Lipo Battery


The atomic number 3 battery is used for UAV Drones, atomic number 3 atomic number 27 oxides, we called it for atomic number 3 polymer battery.


Depending on the different materials of the batteries, there are several systems of atomic number 3 battery: atomic number 3 cobalt oxides, atomic number 3 branding iron orthophosphate, atomic number 3 manganate, and Ternary material (NCM), and it also has another materials, the above materials are refering to anode materials.


Ⅱ. The Features Various Battery:


1- Lithium iron phosphate is too heavy, and with a low-pitched voltage, so it is not usually used as UAV battery.


2- The lithium manganate discharge platform stature, but it has its inherent blemishes. In addition, the discharge pace is too lower, it is not used as UAV battery.


3- The production technology of lithium cobalt oxides is the most mature, and the discharge rate can be increased. It is the best choice for UAV battery, and most of the drone pipe battery are using for UAV monotone, like Agricultural spraying bourdon, industrial poke and racing copters, but its disadvantage is too expensive.


4- Ternary material (NCM) is cheaper, but it is made of three different materials, so there will be many mix proportion fashion, such as 3:3:3, which is the best proportion for UAV drone bombardment. It also has another proportion like 4:3:3, 8:1:1, etc, which means different proportion with different characteristics. First of all, nickel is the most dynamic. (It is the first generation of lithium ion barrage fire, but all failed, because it is too easy to fire and explode.) Cobalt bodily function is slightly less dynamic than nickel, but it is very stable, which is we called lithium shelling. Manganese has low natural action, but the social organization is stable, the disadvantage is that it will lead to a forgetful biography, such as 8:1:1 refer to nickel 8 cobalt 1 manganese 1, the sort order is nickel, cobalt manganese (or called NCM)


Because the ternary material can mix job proportion, nickel has big capability, cobalt is stable, manganese has stable structure and high-pitched platform. So you can mix it due to demand. The discharge multiplying power of ternary materials cannot be very high-pitched.


Mangaese is always weak than other materials. Nickel is too dangerous to be limited. In addtion, because it is a mixture, there is no flat platform. You can see the below figure for the substance of platform:




Ternary Material (NCM) Battert Discharge Curve



Therefore, the battery with discharge platform has better power enduringness when flying, and the electric potential pearl is slower than the ternary battery. In order to solve this job, many ternary batteries now use the 14S method, which aims to reduce the electromotive force pearl when the discharge reaching one-half, so as to extend the trajectory time. But the trouble is that the charger needs 14S charger.


Another way is for high voltage, but it is only a little higher than a normal electric battery. The assault and battery we used is with 4.2V full charge, and the high-tension stamp battery is 4.3V to 4.35V full charge, but it is basically more than 4.3V. The negative side of high-tension barrage fire is also the requirements of charger, and less security. At the second DJI MG series uses this technology for its smart batteries to get longer assault and battery life.





Ⅲ. The Discharge Limitation of UAV Battery


According to the data providing in practice, when the discharger at 1C within 95%, the serving life will not be affected, which is about charging and discharging bicycles.


The discharge is about 3-5C in existent use, and in 85%-90% doesn't affect the military service sprightliness, and lower discharge will make the battery service of process biography molecule than 200 cycles/seconds, sometimes around 300 cpss.


The  life of smart drone battery is longer than that of non-intelligent battery. Because it has management module with function of self discharge and charging protective covering.


The service life of 12S battery is longer than that of ordinary series 6S battery. Because the whole machine balance of 12S is better than that of two independent 6S.




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