Battery voltage detecting device in serially-connected battery pack and method of battery voltage detecting device

Abstract

The invention relates to a battery voltage detecting device in serially-connected battery pack and a method of the battery voltage detecting device. The device comprises a switch module for selectively connecting a positive pole and a negative pole of any one battery with a first bus and a second bus respectively, a voltage-to-current (V-I) conversion module of which the output end current is in a linear relation with the voltage between the first bus and the second bus, a current-to-voltage (I-V) conversion module for converting a current signal at the output end of the V-I conversion module into a voltage signal in linear relation, an analogue to digital (A / D) converter for acquiring the voltage signal and converting the voltage signal into a digital signal, and a controller for controlling the switch module and processing and displaying the information received from the A / D converter. The circuit of the invention is simple; the implementation cost is reduced, and the detection precision is improved.

Description

technical field [0001] The invention relates to voltage detection technology, in particular to a battery voltage detection device and method in series battery packs, which are used in series connection in the fields of pure electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, electric ships, and backup communication power supplies. Voltage detection of individual cells in a battery pack. Background technique [0002] Back-up communication batteries, electric vehicles and hybrid electric vehicles, etc. are often powered by multiple batteries, which are usually connected in series to provide higher voltage. Due to the differences between individual batteries and the limitation of the working voltage platform of the battery, this series of batteries requires battery balancing and battery safety protection to prevent premature failure of the battery and avoid safety problems. Therefore, the system needs to be able to accurately detect the voltage of each ce...

AI Technical Summary

Problems solved by technology

In this scheme, the higher the voltage is, the larger the resistance divider ratio is, and the greater the voltage error is at the same time.

Therefore, in the high-voltage system, the A / D resolution required for sampling is very high, which greatly increases the cost of the product and increases the difficulty of product realization.

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