Why do aircraft model batteries need to be balanced?

Electric lithium electricity and rc lithium electricity is not a thing, batteries, chemical composition, charging and discharging the maximum current is different, cannot be compared. Model aircraft if of li-ion battery series charge, easy to flow between multiple batteries features can't completely consistent, tandem charge will cause the batteries voltage imbalance, it won't even charge in electricity. Balance charger principle is very simple, such as 3 s battery, by three3.7 V battery series, a full charge after each section battery 4.2 V, the overall foreign around 13 V, balance charger will get 13 V alternating current transformer, rectifier dc, with three pressure electrolytic capacitor, resistance to 13 V partial pressure, get the 4.33 V on each of the capacitance, then made a simple closed loop circuit triode, it can control the charging switch as well as the current size, such three recharge the batteries can be independent.

The so-called equalizing charge, is equalization charging battery characteristics, it is to point to in the process of the battery, because the battery the individual difference, the difference of temperature causes such as battery terminal voltage imbalance, in order to avoid the deterioration of the unbalanced trend, need to improve the charging voltage of battery pack, to activate the battery charge. Main is called battery life longer, electric cars the actual is the equilibrium of the rated voltage of 48 v charging and charging pressure is 60 v for the end of the charge is floating

Electric is one of the main components of electric rc planes, work principle and brushless motor is connected the battery and receiver. There are two main functions, one is the battery step-down to 5 v, suitable for the working voltage of receiver and other steering gear; From the receiver to obtain throttle signal, control the turning speed of the motor, which changes the speed of the plane. If yourself methanol machine, also had better use electric adjustable, for electrical modulation has a voltage stabilizing role, no matter how change, battery voltage electric adjustable output value will always remain stable for a 5 v voltage (except the high voltage version), so that the receiver and steering gear work. If direct use battery, voltage down, out of control situation of inadequate prone to voltage, receiver more dangerous

Rc aircraft battery is used in the rc airplanes, toy products, the requirements of the ratio is high, high performance, good security, including battery, nickel metal hydride battery pack, lithium iron phosphate batteries and fuel cells, all sorts of cells each have their own characteristics.

Rc aircraft battery characteristics are as follows:, high safety, long service life, environmental protection free from contamination.

Conventional models: 20122, 3048, 3060, 3465, 3480, 3496, 3480, 43150, 45135, 5060, etc.

Widely used in model aircraft, toys, electric tools, robots, unmanned aircraft, power products such as electric scooter.

Aircraft battery, mainly refers to the power supply device, airplanes for aircraft power source.

Aircraft battery, mainly refers to the power supply device, airplanes for aircraft power source.

Batteries are the classification of the lot, mainly introduces two kinds, according to its application fields, one is used in the rc airplanes, toy products, the requirements of the ratio is high, high performance, safety; The other is a application in manned spacecraft, launch or short range for aircraft. Aircraft battery including battery, nickel metal hydride battery pack, iron phosphate lithium battery and fuel cells, all sorts of cells each have their own characteristics.

Aircraft battery characteristics are as follows: high rate, high energy ratio, high performance, high safety, long service life, environmental protection free from contamination.

The battery requirements is higher, model aircraft, from small to big to manned aircraft, of the discharge rate and volume weight of the battery energy is higher, than it is given priority to with lithium battery, foreign manufacturers have KOKAM, domestic also have FULLRIVER doing this aspect of the battery.

First of all we should make it clear, whether it is a 3.7 V li-ion battery or nickel metal hydride of 1.2 V, is not the point at which the battery fully charged voltage, for lithium electricity, after full voltage of 4.2 V, believe that most people have the universal charger mobile phone battery, can have a look, usually with each output voltage is 4.2 V. The nickel metal hydride is full of electricity can reach about 1.5 V.

In addition to the voltage, and then there is capacity and discharge rate. The capacity of the battery in mAh (mAh), for the unit with the C discharge rate. As for the C number, simple said.1 c for different capacity of the battery is not the same.1 c is refers to the battery 1 c discharge rate discharge can continue to work for 1 hour. Example: 2200 mAh capacity of the battery last for 1 hour, then the average current is 2200 ma, namely, 2.2 A, 2.2 A is the battery 1 c. If the nominal above 30 c (almost all batteries on the market more or less empty mark).It put the battery's biggest current is 2.2 A * 30 = 66 A. That said the battery under the 66 a use is safe.

We are now on the rc lithium-ion battery with a fully known as "Lithium polymer battery", generally referred to as lithium electricity. Since the quality of the brand gap is bigger, so the price also is uneven. As below 11.1 V remote control model aircraft lithium battery for example how to correctly use lithium electricity. Usually, 11.1 V remote control model aircraft lithium battery is composed of three slices of lithium batteries in series (is one of the most widely universalization 3 s battery, figure 1), namely every piece of batteries voltage of 3.7 V. Model, mobile phones, cameras and other lithium voltage marked on electric voltage as labels, from an average working voltage. Monolithic lithium batteries the actual voltage is 2.75 ~ 4.2 V, marked on the lithium electricity discharge capacitance is 4.2 V to 4.2 V power. Remote control model aircraft lithium batteries must be kept in use in this voltage range from 2.75 V to 4.2 V. Such as remote control model aircraft lithium battery voltage is lower than 3.7 V is excessive discharge, belong to severe excessive discharge less than 2.75 V, the battery is fatal damage), expands the lithium electricity, internal chemical liquid crystal, the crystal may be pierced internal structure layer caused by short circuit, even let the li-ion battery voltage to zero, then the battery scrap, if not appear afore-mentioned serious results, crystal will make battery capacity and discharge rate is greatly reduced, so that the value of the battery, so the good habits at ordinary times is to increase the battery life way! Remote control model aircraft belonging to overcharge lithium battery voltage is higher than 4.2 V, the internal chemical reaction is too fierce, lithium electricity will swell, cheerily will burn even if continue to charge explosion (figure 2).So, both discharge or charge will be a devastating damage of lithium battery. So we suggest use comply with safety standards of formal charger to charge the battery, at the same time it is strictly prohibited to privately refitting of charger, it may cause serious consequences!

Charging:

1. The charging current, charging current shall not exceed the maximum charging current specified in the specifications (typically 0.5 ~ 1.0 C or less), generally set 1-2 a current. Using above recommended charging electric current would be likely to cause the battery charge and discharge performance, mechanical performance and safety performance problems, and could lead to a fever or leakage. Current market sales of 5 c model aircraft battery charging current and recommended don't often use 5 c charging, lest affect battery life.

2. The charging voltage, charging voltage shall not exceed the prescribed limits voltage (4.20 V/monomer battery), 4.25 V charging voltage of the highest limit for each section.(it is forbidden to use the batteries, otherwise may cause rechargeable batteries, user consequences due to wrong battery, figure 2 is the best example of ~ ~ ~ I experience).

3. The charging temperature: the battery must be in the product specifications stipulated by the environmental temperature range, otherwise the battery is susceptible to damage. When your battery surface temperature anomalies (refers to the cell surface temperature more than 50 ℃), should immediately stop charging.

Discharge:

1. The discharge current, discharge current shall not exceed the prescribed discharge current largest (formula is "ma number present 1000 times C", it is the battery limit of the discharge current. But in the number of various virtual standard C under the big background, the current theory is generally not ~ ~ ~), large current capacity discharge can lead to collapse and lead to a battery overheat. Play big bypass friends pay attention to cough up ~ ~ ~ in die friends popular words don't get my battery is too fierce, so even though, the life of the battery (discharge rate and capacity) will be significantly lower ~ ~ ~

2. The discharge temperature: the battery must be within the specification of working temperature range. When the battery surface temperature more than 60 ℃, want to stop temporarily, until the battery cooling to room temperature.

3. Lead discharge: a discharge will cause devastating damage to the battery, so best when discharge shall not make monomer battery voltage is lower than 3.7 V.

storage

Battery should be stored in a cool environment, long-term storage battery (more than 3 months), advice on lower temperature for 10 to 25 ℃ and temperature without corrosive gas environment. Battery in the process of long-term storage of every 3 month time to keep the battery charging and discharging activity, and to ensure that each cell voltage in the range of 3.85 V.

The page contains the contents of the machine translation.