What is a single battery?

Single cell is composed of electrodes and electrolyte, which constitutes the basic unit of battery pack, and is called single cell. How to measure the voltage of single battery is better? We usually use mechanical relay isolation detection, differential amplifier isolation detection, partial pressure isolation detection, photoelectric relay detection and so on.

For example, 6DZM20 means: 6 stands for six batteries, each battery is two volts, that is, this battery is 12 volts. DZM stands for maintenance-free electric bicycle, and 20 stands for battery with a capacity of 20 ampere-hours.

Auto-save _ Shili

It is slightly different according to the type of electric vehicle. In a pure electric vehicle equipped with only batteries, the role of batteries is the only power source of the vehicle drive system. In a hybrid vehicle equipped with a traditional engine (or fuel cell) and a battery, the battery can serve as both the main power source and the auxiliary power source of the vehicle drive system. It can be seen that the battery plays the role of the main power source of the automobile drive system at low speed and starting; When fully loaded and accelerated, it is used as an auxiliary power source; It can store energy during normal driving or deceleration braking.

The mechanical relay method can directly measure the voltage of each single battery, but the mechanical relay has a limited life and slow action speed, which is not suitable for long-term rapid inspection. The measurement error of differential amplifier isolation method is basically determined by the error of isolation amplifier, but it is slightly insufficient in economy because of the high measurement cost of each channel. The partial pressure method has fast response speed and low measurement cost, but the disadvantage is that the partial pressure ratio can not be adjusted well and the measurement accuracy is not ideal.

The photoelectric relay method has the advantages of fast response speed, long service life, relatively low measurement cost, and the switch has no contact, which can play the role of voltage isolation. If the selected photoelectric relay adopts PhotoMOS technology, it can achieve high measurement accuracy, so the isolation method of photoelectric relay is an ideal method to measure the voltage of single battery. The voltage measurement method of single battery in this paper is based on photoelectric relay isolation method.