Detection apparatus and method based on alternating-current impedance data for selecting electrolyte film defective product

Abstract

The invention discloses a detection apparatus and method based on alternating-current impedance data for selecting an electrolyte film defective product. The detection apparatus comprises a control terminal, an alternating-current impedance tester and a defective product take-away apparatus, wherein the alternating-current impedance tester comprises an amplifier, an analog switch, an analog-digital conversion module, a control unit, a crystal oscillator, a frequency mixing circuit, an ROM memory and a digital-analog conversion module; the amplifier is connected with the analog-digital conversion module by virtue of the analog switch; the analog-digital conversion module is connected with the control unit; the control unit is connected with the crystal oscillator by virtue of a crystal oscillator pin interface, and a frequency output port of the control unit is externally connected with the frequency mixing circuit; and the frequency mixing circuit is connected with the ROM memory, and the ROM memory is connected with the digital-analog conversion module. According to the method, the control unit, the crystal oscillator and the frequency mixing circuit are used for stimulating a sinusoidal wave signal in the ROM memory, and a disturbing signal for the alternating-current impedance test can be repeatedly monitored. The method is rapid in measurement response, and capable of improving the measurement efficiency and accuracy.

Description

technical field [0001] The invention relates to the technical field of electrochemical analysis, in particular to a detection device and method for screening defective electrolyte film-forming products based on AC impedance data. Background technique [0002] The AC impedance spectroscopy method uses a small-amplitude sine wave potential as a disturbance signal, and uses this small AC signal to disturb the test system, which can not only avoid a large impact on the measurement system, but also make the disturbance and the response of the system The relationship between them is approximately linear, which is convenient for the processing of the later measurement results. [0003] Existing solution system test response is slow, low efficiency, and poor accuracy, and the system structure is complex. [0004] The Chinese patent with the publication number: CN105467215A discloses a method for testing AC impedance of batteries and battery packs, including step 1, selecting a grou...

AI Technical Summary

Problems solved by technology

The structure of the device is complicated, which increases the cost of system measurement

[0007] For the existing solutions, the problems of slow test response, low efficiency and poor accuracy cannot be solved at the same time

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