How to make electrodes

Abstract

The invention discloses a manufacturing method for an electrode slice. The manufacturing method comprises the following steps of (a) preparing a semi-finished electrode slice: selecting a current collector containing metals capable of being magnetized and adopting a wet process to obtain the semi-finished electrode slice; (b) electromagnetic heating: arranging a tab position on the semi-finished electrode slice, then arranging an electromagnetic heating coil below the tab position and switching on an alternating current power supply to heat; (c) cleaning materials with ultrasound: cleaning a melt material layer in a heated tab position region by using the ultrasound; and (d) spot welding a tab: spot welding the tab in the tab position region to obtain the electrode slice. By adding the electromagnetic heating coil below the tab position, the alternating current power supply generates an alternating current magnetic field through the electromagnetic heating coil; only the tab position region above the electromagnetic heating coil has energy conversion to achieve a heating effect; and the tab position region is heated only, so that a heating area is small and the phenomenon of poor powdering caused by a common heat source can be improved.

Description

technical field [0001] The invention relates to the field of making electrode sheets, in particular to a method for making electrode sheets. Background technique [0002] The electrode sheet of the battery is composed of a current collector, a material layer, and a tab, and the production methods include dry and wet methods. The dry process refers to passing the active material and additive powder through the brush box, filling the powder into the current collector, and forming a semi-finished pole piece through roller forming. The dust in the production process is relatively large. Considering the production operation environment and material recycling rate, it is generally necessary to add a powder suction and dust collection device. At the same time, the uniformity and stability of feeding are easily affected by equipment, especially brushes, and the quality of pole pieces is worse than that of wet process. Wet tableting refers to mixing active substances, additives and...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: 1) The conventional heating method belongs to radiation heating, the heating area is large, and it is basically circular, which will cause the active material layer near the tab position to be heated to varying degrees, while the active material in the active material Nickel hydroxide and sub-cobalt are easy to decompose when heated, which affects the quality of the electrode sheet and damages the effective capacity; 2) Radiation heating is point heating, and the heat in the center is high. The binder in the area is softened, and the effect of powdering is poor. The tabs obtained after powder cleaning are often irregular; 3) Radiation heating, conduction in the air will cause energy loss, low heating efficiency, and long heating time , which aggravates the damage to the active material and the irregularity of the shape of the tab

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