Circuit device for detecting battery capacity through intermittent pulse discharge

Abstract

The present invention discloses a circuit device for detecting a battery capacity through intermittent pulse discharge. The device comprises a microprocessor, a transistor (Q) and a sense resistor (Rt). One end of the sense resistor is connected with an analog / digital converter port, a positive electrode of a battery and one end of a load, the other end of the sense resistor is connected with a collector electrode of the transistor, a base electrode of the transistor is connected with a control port of the microprocessor, an emitting electrode of the transistor is connected with a negative electrode of the battery and the other end of the load, and the ratio of the resistance of the sense resistor and resistance of the load is 1 / 5-1 / 10. During working, the microprocessor provides a transient high-level pulse for the control port at intervals of a pause time slot so as to enable the transistor to be in instantaneous saturation conduction and be cut off, and the width of the pause time slot is a hundred thousand times of that of the high-level pulse. According to the above technical scheme of carrying out real-time operation detection on the remaining battery capacity through an intermittent pulse discharge method, the aims of accurate detection and real-time operation detection of the remaining battery capacity are achieved.

Description

technical field [0001] The invention relates to a device for detecting battery power, in particular to a circuit device for detecting battery power through intermittent pulse discharge for real-time detection of remaining battery power. Background technique [0002] Batteries are the power source of many outdoor facilities. Electric vehicles are the direction of future automobile development, and ultimately use batteries as a power source. However, one of the main problems with the battery is that when the battery power is close to being exhausted, the output voltage will suddenly drop, which makes it too late for people to take emergency measures. Therefore, it is very important to monitor the battery power in real time. [0003] The battery described in this article is defined as a storage battery or a rechargeable battery. In the prior art, a voltmeter is used to approximate and estimate the electric energy of the battery in real time. Measuring the remaining power of t...

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Problems solved by technology

[0004] Since the terminal voltage of the battery is determined by the electromotive force of its internal positive and negative electrode substances, and the electromotive force of each substance is determined by the atoms of each substance, it is definite and constant; the voltage change value measured by the voltage method In fact, it is the change of the internal electrochemical reaction process of the battery, the change of the internal resistance of the battery and the change of the output current capacity, and the change of the terminal voltage of the battery will only appear suddenly when the remaining power of the battery is almost exhausted, which makes people caught off guard; Therefore, the voltage method cannot correctly reflect the actual remaining power of the battery;

[0005] Although the amount converted by the discharge method is close to the actual remaining capacity of the battery, because the discharge method consumes a large amount of electric energy and will generate high heat inside the battery, the discharge method is usually only used for battery maintenance and testing. Can not be used for the detection of real-time operation of the battery; therefore, the prior art has the problems and deficiencies of inaccurate detection and the inability to perform real-time operation detection of the battery

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