Lithium polymer battery, the heart of drone aerial photography

The current lithium battery for aerial photography is polymer li-polymer battery, or lithium battery for short. Lithium polymer battery is a new type of battery with many obvious advantages, such as high energy density, more miniaturization, ultra-thin, lightweight, high safety and low cost.

Drone aerial photography of the heart of the silent dedication of the battery

In recent years, unmanned aerial photography has gradually entered the public's field of vision. Its unconventional shooting perspective, convenient operation and simple structure have won the hearts of numerous image creation agencies and even entered the homes of ordinary people.

At present, the mainstream aerial photography uav is a multi-rotor aircraft, a straight aircraft and a fixed wing. Their structure determines that the fixed wing can fly for a long time, but the fixed wing has high requirements for takeoff and landing, and can't hover in flight. While the multi-rotor aircraft, straight aircraft, although the flight time is short, but can be in the complex model takeoff and landing, smooth flight, can hover, good wind resistance, easy to use, is currently in the image creation application of the most models. These two models are powered by batteries and can also be powered by oil-powered engines, but their efficiency is greatly reduced by the mechanical vibration and greater risk of flight. As a result, the use of batteries is becoming more and more popular in unmanned aerial photography. A team is equipped with a dozen or dozens of batteries, which tirelessly provide power protection for various electrical components of aircraft, such as motors, electrical adjustment, flight control, OSD, image transmission, receiver, remote control and monitor. In order to fly better and safer, it is necessary to understand the parameters, use, maintenance, charge and discharge of the battery, so as to ensure the smooth progress of each aerial photography task. Let's take a look at the battery in the aerial photography.

The current lithium battery for aerial photography is polymer li-polymer battery, or lithium battery for short. Lithium polymer battery is a new type of battery with many obvious advantages, such as high energy density, more miniaturization, ultra-thin, lightweight, high safety and low cost. In terms of shape, lithium polymer battery has the characteristics of ultra-thin, can meet the needs of various products, made into any shape and capacity of the battery, the outer packaging for aluminum plastic packaging, different from the liquid lithium battery metal shell, internal quality problems can be immediately through the outer packaging deformation and show, such as bulging.

Starting from the basic parameters of the battery, take a 22.2v10000mah aerial photography power battery as an example to illustrate that it is composed of 6 pieces of lithium batteries with rated voltage of 3.7v and capacity of 10000mah in series, that is to say, 6S1P also has 6S2P batteries, which is composed of 12 pieces of 5000mah batteries in parallel and in series. One thing to note here is that 6S1P is safer than 6S2P because 1P is twice as simple as 2P in structure, and of course 1P is more expensive.

In the lithium battery forspecial model, the single chip cell voltage of 3.7v is the rated voltage, which is obtained from the average working voltage. The actual voltage of the single-chip lithium cell is 2.75~ 4.2v, and the capacitance of the upper mark of the lithium battery is the electricity obtained by discharging from 4.2v to 2.75v. The lithium battery must be kept within the voltage range of 2.75~ 4.2v. If the voltage is lower than 2.75v, it is excessive discharge. The lithium battery will expand and the internal chemical liquid will crystallize. These crystals may puncture the internal structure layer and cause short circuit, or even make the lithium voltage become zero. When charging, the single chip voltage higher than 4.2v is excessive charging, and the internal chemical reaction is too intense. The lithium battery will blow up and expand, and if it continues to be charged, it will expand and burn. Therefore, it is necessary to charge the battery with a regular charger that meets the safety standards. At the same time, it is strictly prohibited to modify the charger privately, which may cause serious consequences.

Also hints, remember: aerial power battery single chip can not be used batteries voltage of 2.75 V, the battery can not provide effective power to aircraft in flight, in order to secure flight, monolithic alarm can be set to 3.6 V voltage, such as the voltage, or close to the voltage, fly hand will do return or land, as far as possible avoid Fried machine as a result of the battery voltage is insufficient.

The discharge capacity of the battery is expressed in multiple (C), which means the maximum discharge current that can be reached according to the nominal capacity of the battery. Common aerial photography batteries are 15C, 20C, 25C or higher. As for the C number, let's just say it's simple. The 1C is different for different capacity batteries. 1C refers to the discharge rate of 1C used by the battery. The discharge can last for one hour. Example: if a 10000mah battery lasts for one hour, the average current is 10000ma, or 10A, which is 1C of the battery. Such as battery with 10000 mah25c again, then the maximum discharge current is 10 a * 25 = 250 a, if it is 15 C, then the maximum discharge current is 10 a * 15 = 150 a, from now on you can see the plane in the dynamic flight, while C number, the higher the battery can provide more current support according to the power consumption of the moment, its discharge performance will be better,, of course, the higher the C number, the battery price will rise. Here to pay attention to do not exceed the number of charge and discharge C battery charge and discharge, otherwise the battery may be scrapped or combustion explosion.

Stick to six "no's" when it comes to battery life. The best way to extend your battery life is to use it the right way.

1, but charge

Some of this there are requirements for the charger, the charger after full power of the function is not perfect, lead to single battery is 4.2 V is not stop charging, in addition, some charger use after a period of time, because components ageing, also prone to stop problem, therefore, when the lithium polymer battery must be someone to look after, when found the charging time is too long, to check whether the charger failure, if failure to remove the battery as soon as possible, otherwise the lithium polymer battery overcharge, then affects the battery life, light weight, appear directly burst into flames.

In addition, please be reminded that when charging, you must charge according to the number of C or lower C specified by the battery, and the charging current shall not be exceeded.

2, but put

The discharge curve of the battery shows that the voltage drop is fast when the battery is discharged at the beginning, but not fast when the battery is discharged to 3.9-3.7v. However, once the voltage drops to 3.7v, the speed of voltage drop will be accelerated, which will lead to over discharge if the control is not good. In the case of light, the battery will be damaged; in the case of heavy, the voltage will be too low, which will cause explosion. Some model friends because the battery is less, so each flight will put, such a battery is very short life. The strategy is to fly as little as one minute and have one more cycle. It's better to buy two more batteries than to fly them over their capacity limit every time. To make full use of the battery alarm, you should land as soon as possible.

3, not enough to save electricity

A fully charged battery cannot be kept fully charged for more than 3 days. If the battery is not discharged for more than a week, some batteries will bulge directly. Some batteries may not bulge temporarily, but after several times of full charge storage, the battery may be discarded directly. Therefore, the correct way is to charge the battery after receiving the flight mission. If there is no flight mission within 3 days after using the battery, please charge the monolithic voltage to 3.80~3.90V and save it. If the battery fails to fly due to various reasons after being charged, the battery should be discharged to 3.80~3.90V within 3 days after being charged. If the battery is not used within three months, continue to store the battery after one charge and discharge to extend the battery life. Batteries should be stored in a cool environment, long-term storage battery, best can in sealed bags or sealed box, suggest the environment temperature is 10 ~ 25 ° C, and dry, no corrosive gas.

4, do not damage the skin

The outer skin of the battery is an important structure to prevent battery explosion and leakage fire. The battery should be handled with care, and when fixing the battery on the plane, the strap should be tightened. Because it is possible to do a big dynamic flight or fall machine, the battery will be because the tie belt is not tight and thrown out, which is also easy to cause damage to the battery skin.

5. No short circuit

This often happens during battery line maintenance and transportation. Short circuits can lead directly to battery fires or explosions. When it is found that the battery is broken after a period of time and needs to be soldered again, it is particularly important to note that the soldering iron should not touch both the positive and negative electrodes of the battery. In addition, in the process of transporting the battery, the best way is that each battery is separately covered with a self-sealing bag and placed in the explosion-proof box to prevent short circuit or skin breaking due to the positive pole and negative pole of a piece of battery encountering other conductive materials at the same time due to turbulence and collision in the process of transportation.

Don't catch cold

This is a principle that many flyers ignore. In the north or high altitude areas often have low temperature weather, at this time the battery such as long time placed outside, its discharge performance will be greatly reduced, if you have to fly at room temperature when the flight time, it will be a problem. At this time, the alarm voltage should be raised (for example, the monolithic alarm voltage is adjusted to 3.8v), because the voltage drop will be very fast in the low temperature environment, and the alarm will land immediately after it rings. In addition, the battery should be kept in a warm environment, such as inside the house, inside the car and the incubator, before taking off. To take off quickly install the battery, and carry out the flight mission. When flying at low temperature, try to shorten the time to half of the normal temperature to ensure safe flight.

At present, there are many brands and types of lithium battery for aircraft model. We should choose suitable batteries according to the electricity demand of our aircraft model, so as to ensure the smooth operation of each electric component. Do not buy some cheap three no battery, also do not buy their own batteries, not to modify the battery. Please stop using the battery if the battery is bulging, broken or not fully charged. Although the battery is a consumable, but it gives flight silently provide energy, we should spend time to pay attention to it, understand it, love it, in order to better, more safe for our every aerial photography flight mission service.

The page contains the contents of the machine translation.