Three-electrode battery and preparation method thereof

Abstract

The invention provides a three-electrode battery and a preparation method thereof. The preparation method comprises the following steps: S1, first tabs are connected to a positive tab and a negative tab of a charged battery cell body respectively, and the first tabs are partially exposed out of a battery shell; S2, a reference electrode is coated with a diaphragm and connected with a second tab, part of the second tab is exposed out of the battery shell, the diaphragm is arranged in the battery shell, and the reference electrode and the charged battery cell body are kept in a non-contact state; and S3, the three-electrode battery is packaged, then electrolyte is injected, and the injection coefficient of the electrolyte is 1.5-3 g / Ah; and then shelving aging and secondary sealing processesare carried out to finish the preparation of the three-electrode battery. Compared with the prior art, the charged lithium battery is reassembled on the basis of reserving the original battery cell body, so that a new three-electrode battery is obtained, and the problem that the charged lithium battery cannot be analyzed and detected in a targeted manner at present is solved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a three-electrode battery and a preparation method thereof. Background technique [0002] Due to the advantages of small size, high energy density, and no pollution to the environment, lithium-ion batteries have been more and more widely used in various electronic products and new energy vehicle industries. Especially with the development of new energy vehicles, lithium-ion batteries are growing explosively. However, the current lithium battery industry has higher and higher requirements for lithium-ion battery life, safety and other performance. However, the interior of the battery is very complicated, and it will be analyzed in detail. The technical means still need to be further improved. [0003] During the use of lithium-ion batteries, the electrolyte of the battery and the positive and negative electrode materials slowly undergo side reactions, such as electrolyte cons...

AI Technical Summary

Problems solved by technology

[0005] 1) Select a new sample, first prepare an uncharged three-electrode battery, and then charge it through a process such as chemical formation. This method can only be analyzed for batteries similar to the failed battery, but cannot be targeted for analysis of the charged lithium battery. The damage of the positive and negative plates (especially the failed lithium battery); in addition, some of the failed batteries are directly assembled into the three-electrode battery for analysis, but due to the defects in the three-electrode preparation method, the test results There is a great deal of unreliability

[0006] 2) Disassemble the failed battery, select the positive and negative plates and other parts to remake, this method destroys the original charged battery, and the newly prepared three electrodes can not guarantee that the selected part can replace the whole because only a part is selected, At the same time, the interior of the lithium battery is relatively complex, and there may be some differences between the local and the whole, which will affect the analysis.

The battery design in the three-electrode device is also an uncharged three-electrode battery, and it is a conventional assembly method. The obtained three-electrode battery cannot guarantee the accuracy of subsequent detection and analysis.

Images