Electrode piece processing technique for lithium ion battery

Abstract

The invention relates to an electrode piece processing technique for a lithium ion battery. The electrode piece processing technique comprises the following steps of: cutting to obtain electrode pieces in predetermined shapes for the lithium ion battery by a cutting die; laminating the electrode pieces in a manner that arbitrary two adjacent electrode pieces are laminated in a face-to-face contact way and outer edges of all the electrode pieces are right flush with one another so as to form a laminated electrode piece body; and cutting the peripheral edge of the laminated electrode piece body with laser such that burrs at the peripheral edge of the laminated electrode piece body are melted or vaporized due to heating, and the burrs melted or vaporized due to heating are taken away under the driving of airflow, thereby cutting and removing the burrs at the peripheral edge of the laminated pole piece body to obtain the electrode piece used for the lithium ion battery. With the application of the technical scheme, the remove of the burrs at the edge of the electrode piece is facilitated, a diaphragm is prevented from being penetrated, and the improvement of the electrochemical performance and the safety of the battery are promoted.

Description

technical field [0001] The invention relates to the field of preparation of lithium-ion batteries, in particular to a treatment process for pole pieces suitable for lithium-ion batteries. Background technique [0002] In order to reduce dependence on oil and CO2 emissions, improve battery performance, improve the overall performance of vehicles, the development of power batteries for electric vehicles has important social significance. However, lithium-ion batteries are currently the biggest bottleneck in the technology and cost of new energy vehicles. Their safety and service life need to be improved, and even serious accidents such as battery combustion and explosion occur frequently. [0003] In the prior art, people often use a knife die to cut the pole piece, but the inventors found during the research process of the present invention that there are many burrs on the edge of the pole piece cut by the knife die, which are easy to pierce the diaphragm, resulting in a shor...

AI Technical Summary

Problems solved by technology

However, lithium-ion batteries are currently the biggest bottleneck in the technology and cost of new energy vehicles, and their safety and service life need to be improved, and even serious accidents such as battery combustion and explosion frequently occur

[0003] In the prior art, people often use a knife die to cut the pole piece, but the inventors found during the research process of the present invention that there are many burrs on the edge of the pole piece cut by the knife die, which are easy to pierce the diaphragm, resulting in a short circuit and affecting the battery. electrochemical performance and safety

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