Lithium battery electrochemical polarization impedance detection method

Abstract

The invention relates to the technical field of impedance detection, and discloses a lithium battery electrochemical polarization impedance detection method. The method comprises the following steps that: S1, before electrochemical impedance detection treatment is carried out on a lithium battery, the lithium battery is made to stand in a ventilated and dry environment, so that an electrolyte canbe in a balanced state, the deviation of the electrochemical polarization impedance of the battery caused by the imbalance of the electrolyte is avoided; S2, the current flowing through the lithium battery also flows through a resistor Rr, the potential of the L point is kept to be 0V, and an I-V conversion amplifier enables the current on the Rr and the current on the lithium battery to be balanced; and S3, the high-end voltage and the voltage of the Rr are measured, so that the impedance value of the lithium battery can be calculated. According to the lithium battery electrochemical polarization impedance detection method can detect the electrochemical polarization impedance value of the lithium battery more accurately and has a wider impedance measurement range. It can be ensured that awider detection condition is provided, so that the detection method has simple performance.

Description

technical field [0001] The invention relates to the technical field of impedance detection, in particular to a detection method for electrochemical polarization impedance of a lithium battery. Background technique [0002] "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and uses a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become the mainstream. [0003] Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Li-ion batteries do not contain metallic lithium and are rechargeable. Lithium metal batteries, the fifth generation of rechargeable batteries, were born in 1996, and their safety, specific capacity, self-discharge rate and p...

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a detection method for the electrochemical polarization impedance of a lithium battery, which can detect the electrochemical polarization impedance value of the lithium battery more accurately, and has a wider resistance The measurement range also guarantees a wide detection condition, which makes the detection method have the advantages of simple performance and solves the problem of certain defects in the current detection of lithium battery electrochemical polarization impedance, which cannot detect lithium battery more accurately Chemical polarization impedance value, and the measurement range of impedance is small, and the detection conditions are relatively harsh, making the overall detection process complicated and difficult to operate

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