The name of the invention is a battery set core
voltage sampling circuit, belongs to the technical field of a battery
management system and mainly aims to solve problems of poor anti-interference property, poor stability and bad influence on consistency and the service life caused by the
continuous leakage current of batteries because of having no isolation between a core
voltage sampling circuitin the prior art and a
voltage dividing sampling
resistor. The battery set core voltage sampling circuit is mainly characterized by comprising a battery set, a gate switch unit, a decoder unit, a maincontroller, a sampling conversion unit, a voltage conditioning unit, an
analog to digital conversion unit and a data isolation unit, wherein the gate switch unit and the sampling conversion unit areconnected through buses Va and Vb, the voltage conditioning unit is composed of a filter circuit and a
negative feedback amplifying circuit, the
negative feedback amplifying circuit is supplied with power through an isolation power source, and the power source ground is connected with a
signal of the sampling conversion unit with a low sampling output voltage. The battery set core voltage samplingcircuit is advantaged in that good anti-interference property, good safety, strong
scalability and relatively low cost are realized, and the battery set core voltage sampling circuit is mainly used for sampling and detecting multiple single cores of the battery set.