Non-contact detection method and system for conductivity of energy storage material

Abstract

The invention discloses a non-contact detection method for the conductivity of an energy storage material. The energy storage material is excited by a pulsed magnetic field with the frequency lower than 10MHz; the pulsed magnetic field induces vortex current in the energy storage material, the energy storage material absorbs joule heat, destroys thermodynamic equilibrium in the material to generate thermal expansion, a thermo-acoustic signal is generated along with the thermal expansion, the ultrasonic transducer placed around the material is used for detecting the generated thermo-acoustic signal, and the signal can reflect internal conductivity information of the material. According to the method, a pulsed magnetic field is used for excitation, a thermo-acoustic signal is detected, the conductivity of the energy storage material to be detected is finally obtained, and the method is a high-resolution non-contact conductivity detection method. According to the method, contact with thetarget body is not needed in the testing process, the body cannot be damaged, the target cannot be polluted, and the conductivity of the target body in any shape can be detected. The problems of contact mode, resolution and the like in the existing solid material conductivity detection are effectively solved, and the detection means are enriched.

Description

technical field [0001] The invention relates to the technical field of conductivity detection of energy storage materials, in particular to a non-contact detection method and system for the conductivity of energy storage materials. Background technique [0002] A supercapacitor is mainly composed of four parts: an electrode, an electrolyte, a diaphragm, and a current collector. The electrode is responsible for the accumulation of charges and the generation of capacitance. Therefore, the core issue of studying a supercapacitor is to study the electrode material, and the conductivity of the electrode material determines the electrode. The performance of the material, that is to say the power density of the capacitor and the charge and discharge performance of the high current depends largely on the conductivity of the electrode material. Therefore, the detection of electrical conductivity is of great significance to the development of energy storage materials. [0003] The cu...

AI Technical Summary

Problems solved by technology

The target object detected by the conductivity meter is the conductivity of the liquid material. Since the final shape of the energy storage material is solid, the conductivity meter is not suitable for the detection of the conductivity of the formed electrode.

However, the four-probe method is contact-based, which cannot realize non-contact detection of the conductivity of energy storage materials, and requires the shape of the material to be regular, so it cannot realize the detection of the conductivity of targets with arbitrary shapes.

[0004] Therefore, a new non-contact detection method for the conductivity of energy storage materials is sought to effectively solve the problems of contact mode and resolution in the current conductivity detection of solid materials and enrich its detection methods.

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