Method for detecting poor contact of battery voltage testing terminals

Abstract

The invention discloses a method for detecting poor contact of battery voltage testing terminals, in particular to a technology for detecting the poor contact of voltage testing terminals, which is suitable for a rechargeable battery. Two ends of a voltage sampling circuit are connected with a test circuit capable of controlling on-off, and micro current is injected into the battery through a voltage test line of the battery; and then the voltage values of both ends of the anode and cathode of a voltage test line are respectively measured under the states of current switching on-off, no change of the voltage value shows good contact of voltage terminals, and the change of the voltage value shows that the voltage test terminals and the battery have contact resistance, i.e. the voltage test terminals have poor contact. The invention has good test effect, can easily detect the contact situation of the voltage test terminals, and can calculate the value of the contact resistance; and in addition, the method has small test current and short test time, and has no influence on the normal detection of the battery; and the test circuit for the method has simple principles and is easily realized.

Description

technical field [0001] The invention relates to a method for poor contact of a battery voltage test terminal, in particular to a technique suitable for detecting poor contact of a voltage test terminal of a rechargeable battery such as a nickel-cadmium battery, a nickel-hydrogen battery or a lithium-ion battery. Background technique [0002] At present, in the battery test technology, the four-wire test method in which the voltage test terminal and the current test terminal are separated is generally used for testing. The advantage of using the four-wire test method is that the battery voltage value can be accurately tested. When the contact is poor, there will be a large contact impedance between the terminal and the battery. Since the voltage sampling circuit has a certain input resistance and input current, there will be a voltage drop on the contact resistance, resulting in inaccurate acquisition of the voltage sampling circuit. battery voltage signal. Contents of the ...

AI Technical Summary

Problems solved by technology

[0002] At present, in the battery test technology, the four-wire test method in which the voltage test terminal and the current test terminal are separated is generally used. The advantage of using the four-wire test method is that the battery voltage value can be accurately tested, but when the voltage test terminal and the battery When the contact is poor, a large contact impedance will be generated between the terminal and the battery. Since the voltage sampling circuit has a certain input resistance and input current, a voltage drop will occur on the contact resistance, resulting in inaccurate collection of the voltage sampling circuit. The battery voltage signal

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