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How to calculate battery voltage and battery count?

by:dcfpower     2021-03-12

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. , The voltage of a single cell when fully discharged 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 avoid over-discharge of lithium battery pack.

If you have used nickel-cadmium batteries (Ni-Cd) and nickel-metal hydride batteries (Ni-MH) to fly, due to a single nickel-cadmium battery (Ni-Cd) The voltage with the Ni-MH battery is 1.2V, while the lithium battery is 3.6V, so you have to perform some conversions. If you originally used 6 to 7 nickel-cadmium or nickel-metal hydride batteries, you can use two lithium batteries 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.

There are many flying friends who originally used 8 nickel-cadmium or nickel-metal hydride batteries, but they will be stuck in the choice of two or three lithium batteries in series to get an approximation Among the choices of voltage. In my experience, the best way to choose is to first understand the power consumption (W) required to fly with nickel-cadmium or nickel-metal hydride batteries, and then use lithium batteries, motors, and propellers. 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 (9.6V), and the current is 10 amperes during flight. Then you need 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. Collocation estimations like this require a little experience to get the best matching effect, but calculating the power output based on this is a good way to start.

Four. Use 3S4P (3 series and 4 parallel) to obtain 10C lithium battery pack current discharge capacity. The speed of battery discharge depends on the maximum current output that can be provided at an instant. The current output is usually estimated by using the word C'. C stands for: 60 minutes/minutes required to discharge the battery.

For example, 1C means that the battery takes 1 hour (60 minutes) to charge the battery. Discharged; 2C means that the battery takes 0.5 hours (30 minutes) to discharge the power.

All batteries use 'milliampere hours (mAh) to calculate the battery capacity. Assuming that a battery is labeled 2000mAh, it means that when we discharge it with a current of 2000mA (equal to 2A), it takes an hour to complete the discharge. How much C is used to discharge the battery during use is related to the battery capacity. 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 With high C-number and high-current discharge capability like nickel-cadmium or nickel-metal hydride batteries, 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 the original 2000mAh battery. However, due to the doubled capacity, it is assumed that the original 2000mAh battery can discharge up to 5c to provide 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 instantaneous high current output capabilities that a single lithium battery cannot provide.

Through the XSXP naming method, we can easily understand how many batteries are connected in series to increase the voltage of a battery pack, and how many groups of the same voltage battery pack are connected in parallel to increase the discharge current. The front 's'

stands for Series; the back 'p stands for Parallel. Therefore, a 3S4P battery pack is composed of a single 2100mAh lithium battery. It means that it consists of 12 lithium batteries, its voltage is three times that of a single lithium battery, and its discharge current capacity is four times that of a single lithium battery. Therefore, if the maximum discharge C number of this battery pack is 6C, it represents It is a set of lithium battery pack packs with a voltage of 10.8V (3×3.6) and a maximum discharge current of 50.4A (2100mAh×6C×4Pu003d2.1A6×4u003d50.4.


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