How to calculate the battery voltage and the number of batteries?

How to calculate the battery voltage and the number of batteries? The characteristics of lithium polymer batteries during charge and discharge are different from nickel-cadmium batteries and nickel-metal hydride batteries. When the lithium battery is fully charged, the voltage is about 4.2V, and when the battery is fully discharged, the voltage is about 3V. When using lithium batteries, the voltage of a single lithium battery should be kept between 3~4.2v. Overcharge and overdischarge will cause damage to the lithium battery. Don't forget to set the cut-off discharge voltage of your electronic transmission to prevent lithium overcharge. Special-shaped Lithium Battery If you use Ni-CD and Ni-MH batteries in flight, you will have to perform some conversion, because a single Ni-Cd and Ni-MH The voltage of the battery is 1.2v, and the voltage of the lithium battery is 3.6v. If the original battery is 6~7 nickel-cadmium batteries or nickel-hydrogen batteries, then two lithium batteries can be connected in series to get an approximate voltage. If the original battery is 10 to 11 nickel-cadmium batteries or nickel-hydrogen batteries, then 3 lithium batteries can be connected in series to get an approximate voltage. Ni-MH battery performance indicators Many passengers who initially used 8 nickel-cadmium batteries or nickel-hydrogen batteries had to choose between 2 or 3 lithium batteries to obtain similar voltages. Based on my relevant experience, the best way to do this is to know the power wattage (W) of nickel-cadmium batteries or nickel-metal hydride batteries used in previous flights, and then combine them with lithium batteries, engines, and The propellers are combined to achieve a similar power output. For example, suppose your previous aircraft used a class 400 engine, used 8 nickel-cadmium batteries or nickel-metal hydride batteries (9.6v), and the current was 10 amperes. You have to consume 9.6×10u003d96(W) watts of energy per second, so if you use 2 lithium batteries (7.2v), you may have to change the propellers to fly at 13 amps. Or use three lithium batteries (10.8v), replace the propellers to fly, and let the current reach 8.9 amps. It is estimated that a little bit of relevant experience is needed to get the best matching effect, but calculating the power output based on this is a good start. The 3S4P (3 series 4 parallel) method was used to calculate the discharge capacity of 10C lithium batteries. The discharge rate of the battery depends on the maximum current output that can be supplied instantly. The current output is usually represented by C, which is the 60 minutes/minute required for battery discharge. For example, 1C means that the battery takes 1 hour (60 minutes) to power off; 2C means that the battery takes half an hour (30 minutes) to power off. All batteries are measured in milliampere hours (milliamperes). Suppose a battery is marked as 2000mAh, which means that when we discharge with 2000mA (equal to 2A), it will take an hour to discharge. How much carbon is used to discharge the battery depends on the battery's capacity. If the 2000mah battery discharge current is 2A, it is 1C discharge; if it is discharged with 6A current, it is 3C discharge (6Au003d6000mAu003d2000mA*). 3) The current lithium battery technology cannot make lithium batteries have the high C-number and large current discharge capacity like nickel-cadmium batteries or nickel-metal hydride batteries, so many lithium battery packs can achieve higher instantaneous discharge current capacity through parallel connection. When two batteries are connected to a larger battery by means of anode-to-anode and cathode-to-cathode, the battery voltage remains unchanged and the capacity is doubled. If you have two 2000mAh batteries, if you connect them in parallel, the effect is equivalent to a 4000mAh battery pack. The maximum discharge C number of the 4000mAh battery pack is the same as that of the original 2000mAh battery. However, due to the capacity doubling, it is assumed that the original 2000mAh battery can discharge up to 5c and the maximum current is 10A. The 4000mAh battery obtained by connecting two sets of 2000mAh batteries in parallel is also discharged at 5C, and the maximum discharge current is increased to 20A. In this way, the lithium battery can supply instantaneous large current output that a single lithium battery cannot supply. Through the XSXP naming method, you can easily know how many batteries are connected in series to increase the voltage of the battery pack, and how many batteries are connected in parallel to increase the discharge current. The s in front of it. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.