Cylindrical battery case cutting method

Abstract

The present invention relates to a cylindrical battery case cutting method, which comprises: annularly cutting both ends of a cylindrical battery case and linearly cutting along the axial case of the cylindrical battery by using a laser device, wherein the battery case is opened in a stretch manner after the annular cutting and the linear cutting are performed on the cylindrical battery case so as to easily take out the electric core of the cylindrical battery. According to the present invention, with the application of the laser to cut the battery case, the advantages of rapidness, low noise and less damage on the electric core can be achieved, the large-scale automatic production can be formed, and after the battery case is cut, the case material is completely separated in advance so as to drastically reduce the consumption of the wet recovery extractant and maximize the recycling benefits.

Description

Technical field [0001] The invention relates to a method for cutting cylindrical battery shells, which belongs to electronic waste processing technology. Background technique [0002] Lithium-ion battery (Lithium-ion battery), Ni-Cd and Ni-MH batteries are rechargeable batteries (secondary batteries), which are widely used in consumer electronics (such as mobile phones, notebook computers, etc.), military, pure electric vehicles and aviation aerospace. A rechargeable lithium-ion battery can generally be charged and discharged 800 to 1000 times. If you charge and discharge once a day, the life of a lithium-ion battery is 2 years. With the widespread application of lithium-ion batteries in China, the annual output has grown from 1.6 billion in 2010 to 5.2 billion in 2014, resulting in a large number of waste lithium-ion batteries. A large amount of toxic rare metal cobalt, but because cobalt is an important strategic metal, the current research comparing spent lithium-ion batteri...

AI Technical Summary

Problems solved by technology

[0003] Patents CN201010269217.4, CN201410164190.0 and CN201510545470.0 are mechanically cut with saw blades and are noisy, suitable for cutting large-sized square batteries, but not suitable for small-sized cylindrical batteries;

[0004] For example, the patent CN201510714591.3 is a cutting machine for non-destructively dismantling cylindrical batteries with metal shells, which realizes ring cutting of cylindrical batteries, but the cells of secondary batteries (rechargeable batteries) swell after use, and are closely attached to the shell. Very tight, it is quite difficult to remove the battery

[0005] For example, the patent CN201420711284.4 has completed the cutting of the electrode head and the bottom of the 18650 battery. Due to the expansion of the battery cell of the waste battery, the battery cell cannot be guaranteed to be 100% ejected from the shell.

[0006] For example, the patent CN201620223796.1 realizes laser cutting on one side of the square battery shell, which is used for repairing defective products in the production process of square batteries. At this time, the battery cells can be easily taken out after cutting.

If it is used to cut the discarded cylindrical battery case, it is not easy to take out the battery cell from the case because the cell expands and clings to the case

[0007] Patent CN201520259903. The water jet cutting method cuts the battery, and the penetrating cutting damages the battery cell, electrolyte and some electrode materials to be disposed of in the water, and the cost is high

Images