Voltage detecting circuit for multiple serial batteries

Abstract

The invention discloses a voltage detecting circuit for multiple serial batteries, comprising an operational amplifier, a first resistor, a second resistor, an insulated gate field-effect transistor and a voltmeter. The same-phase input end of the operational amplifier is used as a low potential detecting input end, the invert-phase input end of the operational amplifier is respectively connectedwith the source electrode of the insulated gate field-effect transistor and one end of the first resistor, the other end of the first resistor is used as a high potential detecting input end, the output end of the operational amplifier is connected with the grid electrode of the insulated gate field-effect transistor, the drain electrode of the insulated gate field-effect transistor is grounded through the second resistor, and the input end of the voltmeter is connected to the drain electrode of the insulated gate field-effect transistor and the contact of the second resistor. The voltage detecting circuit can be used for detecting the voltage of each electric core in tens to hundreds of serial battery packs and has the advantages of high detecting precision, low cost, low power consumption and the like.

Description

[technical field] [0001] The invention relates to a voltage detection circuit of multiple series batteries. [Background technique] [0002] In the existing battery management systems on the market, it is a technical problem to detect the voltage of each battery cell in a battery pack with multiple cells connected in series, especially in a battery pack with more than 4 cells connected in series. The lower level can only reach 20mV, and the number of battery cells in series to be detected is limited, the largest is only 13 cells, and the power consumption is also relatively large. [Content of the invention] [0003] The present invention overcomes the disadvantages of the above technologies, and provides a voltage detection circuit capable of detecting the voltage of each battery cell in dozens to hundreds of series-connected battery packs, with high detection accuracy, low cost and low power consumption. [0004] In order to achieve the above object, the present invention...

AI Technical Summary

Problems solved by technology

[0002] In the existing battery management systems on the market, it is a technical problem to detect the voltage of each battery cell in a battery pack with multiple cells connected in series, especially in a battery pack with more than 4 cells connected in series. The lowest can only reach 20mV, the number of battery cells in series for detection is limited, the largest is only 13 cells, and the power consumption is also relatively large

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