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

The characteristics of lithium polymer batteries during charging and discharging are different from those of nickel-cadmium (Ni-Cd) and nickel-hydrogen batteries (Ni-MH). When a single lithium battery is fully charged, the voltage is about 4.2V, fully discharged The voltage of a single cell at the end is about 3V. When using lithium batteries, we must keep the voltage of a single lithium battery between 3~4.2V. Both 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 guard against over-discharge of lithium batteries. If you have used nickel-cadmium batteries (Ni-Cd) and nickel-metal hydride batteries (Ni-MH) for flying, because a single nickel-cadmium battery (Ni-Cd) and nickel-metal hydride (Ni-MH) battery The voltage of the battery is 1.2V, and the lithium battery is 3.6V, so you have to do some conversion. If 6 to 7 nickel-cadmium or nickel-hydrogen batteries are used, two lithium batteries can be connected in series to obtain an approximate voltage. If you use 10 to 11 nickel-cadmium or nickel-metal hydride batteries, you can connect three lithium batteries in series to obtain an approximate voltage. Many Feiyou Ni-MH battery performance indicators used 8 nickel-cadmium or nickel-hydrogen batteries, but they are stuck in the choice of choosing two or three lithium batteries in series to obtain an approximate voltage. According to my relevant experience, the best way to choose is to know the power consumption (W) required to fly with Ni-Cd or Ni-MH batteries, and then use lithium batteries, motors, Propeller in order to obtain advanced power output. For example: if your previous aircraft used a class 400 motor, 8 nickel-cadmium or nickel-metal hydride batteries, batteries (9.6V), and a current of 10 amperes during flight. Then you have to consume 9.6×10u003d96 (W) watts of power per second, so if you use two lithium batteries (7.2V), you may have to change the propellers to fly, the current is 13 amps; or use three lithium batteries Battery (10.8V), and change the propellers to fly, so that the current is 8.9 amps. Such matching estimation requires a little relevant experience in order to obtain the best matching effect, but calculating the power output based on this is a good way to start the estimation. Fourth, use 3S4P (3 series and 4 parallel) to obtain 10C lithium battery current discharge capacity. The battery discharge speed depends on the maximum current output that can be supplied at an instant. Current output is usually estimated using the word C, where C stands for: 60 minutes/minutes required to discharge the battery. For example, 1C means that the battery takes 1 hour (60 minutes) to discharge the power; 2C means that the battery takes 0.5 hours (30 minutes) to discharge the power. All batteries use milliampere hours (mAh) to calculate battery capacity. Assuming that a battery is labeled 2000mAh, it means that when we use 2000mA (equal to 2A) to discharge it, it will take an hour to discharge. How much C is used to discharge the battery during use is related to the capacity of the battery. If a 2000mah battery is discharged with a current of 2A, it is a 1C discharge; if it is discharged with a current of 6A, it is a 3C discharge (6Au003d6000mAu003d2000mA*. 3) The current lithium battery technology is still unable to allow lithium batteries It has high C-number and high-current discharge capability like nickel-cadmium or nickel-metal hydride batteries, so many lithium battery packs can achieve higher instantaneous discharge current capabilities through parallel connection. When two sets of batteries are connected in parallel to form a larger battery by connecting the positive electrode to the positive electrode and the negative electrode to the negative electrode, the voltage of the battery 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 this 4000mAh battery pack is the same as that of the original 2000mAh battery. However, due to the doubled capacity, it is assumed that the original 2000mAh battery can discharge up to 5c to supply a maximum current of 10A; by connecting two sets of 2000mAh batteries in parallel The 4000mAh battery derived from the battery is also discharged at 5C, and its maximum discharge current is increased to 20A. In this way, the lithium battery pack can provide instant high current output capability that a single lithium battery cannot supply. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Analysis of lead-acid battery maintenance methods