Battery voltage detection circuit and battery management system

Abstract

The invention is suitable for the field of electronic circuits and provides a battery voltage detection circuit and a battery management system. The circuit comprises a plurality of switch units, a first operational amplification unit, a second operational amplification unit, a control unit and a power supply changeover unit; the plurality of switch units are used for switch-on and switch-off under the control of a control signal; the first operational amplification unit is used for sampling voltage of an odd number of corresponding single batteries when the switch units are switched on, and outputting first sampling voltage; the second operational amplification unit is used for sampling voltage of an even number of corresponding single batteries when the switch units are switched on and outputting second sampling voltage; the control unit is used for outputting the control signal and controlling the switch-on and switch-off of the switch units when power is supplied and performing analog-to-digital conversion on the first sampling voltage and the second sampling voltage; and the power supply changeover unit is used for providing a stable working power supply for the control unit.Two operational amplifier units are staggered in an odd and even way and sample a battery to be detected; and the circuit has a simple structure, and is low in cost, reduces the electricity consumption difference of the battery, switch control is provided, and power consumption during standby is further reduced.

Description

technical field [0001] The invention belongs to the field of electronic circuits, in particular to a battery voltage detection circuit and a battery management system. Background technique [0002] Today, as lithium batteries are booming with the development of new energy sources, the requirements for battery management systems are getting higher and higher, and the cost requirements are becoming more and more stringent. In the battery management system, since each battery module is used in series, how to accurately detect the battery voltage of each module while ensuring the lowest power consumption of the battery management system after sleep, and the low power consumption difference in the working state is already a problem. A dream pursued by electronic engineers. [0003] At present, there are four methods in the industry to detect battery voltage: one is to use dedicated chips, such as OMicro’s OZ89xx chips, but the price is expensive; the other is to use differential...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a battery voltage detection circuit, aiming at solving the problems of complex structure, large standby power consumption and high cost of the existing battery detection circuit

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