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Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc

Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.

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release time:2023-02-02 Hits: Popular:AG11 battery

The working voltage, also known as terminal voltage, refers to the potential difference between the positive and negative electrodes of the battery when the battery is in working condition, i.e. when there is current flowing through the circuit. When the battery is discharging, when the current flows through the battery, it is necessary to overcome the resistance caused by the internal resistance of the battery, which will cause ohmic voltage drop and electrode polarization. Therefore, the working voltage is always lower than the open circuit voltage, while the terminal voltage is always higher than the open circuit voltage during charging. That is to say, the polarization results in that the terminal voltage of the battery is lower than the electromotive force of the battery when it is discharged, and the terminal voltage of the battery is higher than the electromotive force of the battery when it is charged.
Due to the existence of polarization phenomenon, it will lead to a certain deviation between the instantaneous voltage and the actual voltage during battery charging and discharging. When charging, the instantaneous voltage is slightly higher than the actual voltage, and the polarization disappears after charging, and the voltage drops back; When discharging, the instantaneous voltage is slightly lower than the actual voltage, and the polarization disappears and the voltage rises after the discharge.
To sum up, the composition of battery terminal voltage is shown in Figure 3, and the expression is:
Charging: VCH=(E+- E -)+VR=(E+0+ η+)- (E-0 - η-)+ VR
Discharge: VD=(E+- E -) - VR=(E+0- η+)- (E-0 + η-)- VR
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