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The heart of drone aerial photography silently dedicated battery

by:dcfpower     2021-03-13

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

At present, the mainstream aerial photography drones are multi-rotor, straight plane and fixed wing. Their structure determines that the fixed wing can fly for a long time, but the fixed wing requires high take-off and landing. Factors such as the inability to hover in the middle are often only used in surveying and mapping industries that do not require high image quality. Although multi-rotor and straight aircraft have a short flight time, they can take off and land in complex terrain, fly smoothly, can hover, have good wind resistance, and are easy to use. They are currently the most widely used models in image creation. These two models use batteries as the main power source. The straight plane can also be powered by an oil-powered engine, but the mechanical vibration and greater flight risk caused by the oil-powered engine greatly reduce its utilization rate. As a result, the use of batteries is becoming more and more popular in unmanned aerial photography. The various batteries that a team is equipped with range from a dozen to dozens. They work tirelessly for motors, ESCs, flight controls, OSDs, and graphics. All electrical components of the aircraft, such as transmitters, receivers, remote controllers, and monitors, provide power protection. For better and safer flight, it is necessary to understand the battery parameters, use, maintenance, charging and discharging, etc., so as to ensure the smooth progress of each aerial photography mission. Let's take a look at the battery that was silently dedicated in aerial photography with Grignard.

The lithium battery pack used in aerial photography is called 'lithium polymer battery' (Li-polymer, also known as polymer lithium battery), generally referred to as lithium battery. Lithium polymer battery has many obvious advantages such as high energy density, smaller size, ultra-thin, lightweight, high safety and low cost, and is a new type of battery. In terms of shape, lithium polymer batteries have ultra-thin characteristics, which can be made into batteries of any shape and capacity to meet the needs of various products. The outer packaging is aluminum-plastic packaging, which is different from the metal shell of liquid lithium batteries. The internal quality is hidden. It can be immediately shown by deformation of the outer packaging, such as bulging.

Let’s start to understand the basic parameters of the battery. Take a 22.2V10000mah aerial power battery as an example. It is composed of 6 lithium batteries with a rated voltage of 3.7V and a capacity of 10000mah in series. The 6S1P also has 6S2P batteries, which are composed of 12 5000mah batteries in parallel and in series. One thing to note here is that 6S1P has a higher safety factor than 6S2P, because 1P has a structure that is twice as simple as 2P, and of course the price of 1P is also higher.

In a model airplane lithium battery, the single-chip cell voltage 3.7V is the rated voltage, which is obtained from the average working voltage. The actual voltage of the monolithic lithium battery is 2.75~4.2V, and the capacity of the lithium battery is the amount of electricity obtained by discharging 4.2V to 2.75V. Lithium batteries must be used within the voltage range of 2.75~4.2V. If the voltage is lower than 2.75V, it is an over-discharge, the lithium battery pack will expand, and the internal chemical liquid will crystallize. These crystals may pierce the internal structure layer and cause a short circuit, or even make the lithium battery voltage zero. When the single-chip voltage is higher than 4.2V during charging, it is an overcharge. The internal chemical reaction is too intense, and the lithium battery will swell and expand. If it continues to charge, it will expand and burn. Therefore, you must use a regular charger that meets the safety standards to charge the battery. At the same time, it is strictly forbidden to modify the charger privately, which may cause very serious consequences!

One more reminder, remember: You cannot use the single-chip battery voltage of the aerial power battery to 2.75V. At this time, the battery can no longer provide the aircraft with effective power for flight. For safe flight, you can use the single-chip The alarm voltage is set to 3.6V. If it reaches this voltage or is close to this voltage, the pilot must perform a return or landing action to avoid the bombing of the aircraft due to insufficient battery voltage.

The discharge capacity of the battery is expressed in multiples (C), which means the maximum discharge current that can be achieved according to the nominal capacity of the battery. Common aerial photography batteries include 15C, 20C, 25C or higher C-number batteries. As for the C number, to put it simply. 1C is different for different capacity batteries. 1C means that the battery can continue to work for 1 hour when discharged with a discharge rate of 1C. For example: a battery with a capacity of 10000mah continues to work for 1 hour, then the average current is 10000ma, which is 10A, and 10A is the battery's 1C. If the battery is marked with 10000mah25C, then the maximum discharge current is 10A*25u003d250A. If it is 15C, then the maximum discharge current is 10A*15u003d150A. From this, it can be seen that the higher the C number is when the aircraft is flying in high dynamics. The battery can provide more current support according to the moment of power consumption, and its discharge performance will be better. Of course, the higher the C number, the higher the battery price. It should be noted here that do not exceed the charge and discharge C number of the battery for charging and discharging, otherwise the battery may be scrapped or burned and exploded.

In the use of the battery, we must adhere to six 'nosgood idea.

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