Three-electrode device of cylindrical battery and assembling method thereof

Abstract

The invention provides a three-electrode device of a cylindrical battery and an assembling method of the three-electrode device of the cylindrical battery. The three-electrode device comprises a shell body, positive plates, negative plates, diaphragms, an upper mould, a lower mould, a reference electrode and a reference electrode column, wherein the diaphragms are respectively clamped between each layer of the positive plates and each layer of the negative plates, and the positive plates, the negative plates and the diaphragms are together encircled and rolled into a cylindrical roll core, and the cylindrical roll core is filled with an electrolyte; the cylindrical roll core is mounted in the shell body, the lower mould is mounted at an opening of the shell body, the tail end of the reference electrode column is inserted into a cavity in the center of the cylindrical roll core from the center hole of the lower mould, the reference electrode is mounted at the tail end of the reference electrode column, and the upper mould is fixed on the lower mould trough screwing screw threads. The three-electrode device of the cylindrical battery and the assembling method of the three-electrode device of the cylindrical battery disclosed by the invention aim at avoiding the defects of the three-electrode device such as complicated structure, low capacity, poor reference and bad sealing in the prior art, and further fill up the blank of three-electrode systems of cylindrical lithium ion batteries.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a cylindrical battery three-electrode device and an assembly method thereof. Background technique [0002] Using the three-electrode system to extract the potential of the positive and negative electrodes of the battery and compare it with the potential of the reference electrode, the change of the potential of the positive and negative electrodes during the electrochemical reaction can be directly obtained. Furthermore, starting from the internal reaction mechanism of the battery, while avoiding side reactions inside the battery, the performance of battery cycle, high and low temperature charge and discharge, and rate charge and discharge are studied. It has very important guiding significance in battery structure design, pole piece design, positive and negative electrode ratio, material matching, electrolyte composition optimization, etc. Therefore, it is very important to provide a t...

AI Technical Summary

Problems solved by technology

The manufacturing and assembly methods of the device are complicated, the cost is high, and the structure of the actual battery is very different, so the reference is poor.

[0004] The current three-electrode structure has various defects, such as low capacity, complex structure, poor sealing, and a large difference between the structure and the physical battery, which cannot truly reflect the performance characteristics of the actual battery.

Too much or insufficient electrolyte filling will cause changes in the internal polarization of the battery, and also cannot achieve accurate characterization of battery performance.

Moreover, there is no three-electrode system suitable for cylindrical lithium-ion batteries in current inventions and utility models.

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