Series cr2032 3v lithium battery voltage detection circuit design

　　Series cr2032 3v lithium batterys are widely used in hand-held tools, laptop computers, communication radios, portable electronic equipment, aerospace satellites, electric bicycles, electric vehicles, and energy storage devices. In order to maximize the available capacity of the cr2032 3v lithium battery and improve the reliability of the cr2032 3v lithium battery, the performance of the single cells in the cr2032 3v lithium battery should be consistent, so the single cells need to be monitored, that is, the voltage of the single cells needs to be measured.

　　There are many methods for measuring the voltage of series cr2032 3v lithium batterys. Currently, the two most widely used methods are differential detection type and current source detection type. The differential detection type requires the resistance values of the two resistor pairs to be strictly matched, otherwise it will affect the detection accuracy of the cr2032 3v lithium battery voltage. In order to reduce the impact of the leakage current of the detection line on the consistency of the cr2032 3v lithium battery when using this method, the resistance value of the resistor needs to be increased, so that This will increase the difficulty of mass production and reduce detection accuracy. The current detection type detection circuit only requires resistance matching of one resistor pair. It is mentioned that in order to improve the detection accuracy, resistors with small resistance matching are needed, but this increases the leakage current of the detection line. In actual use, in order to reduce the impact of the leakage current of the detection line on the consistency of the cr2032 3v lithium battery and reduce the power consumption of the voltage detection circuit, it is necessary to add a switching control device to the voltage detection line, often using an optocoupler or a photoelectric relay. The current-type voltage detection circuit has good performance, but cannot detect when the voltage is lower than 2V. This article first improves the voltage detection circuit and expands the voltage detection range. Secondly, an improved voltage detection circuit and a photoelectric relay as a control switch were used to analyze and experiment the factors that affect the voltage detection accuracy. Finally, an electronic switch was used to replace the photoelectric relay, thereby improving the voltage detection accuracy.

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