Highly efficient drying device for pole coils and drying method thereof

Abstract

The invention provides a highly efficient drying method and device for a pole coil. The drying device mainly comprises an outer box body, a drying cavity, heaters, a horizontal metal mandrel, a pole coil winding drum, an air conveying motor, a wind wheel and the like. The heaters are fixed to the upper portion, the lower portion, the left side, the right side, the rear portion of the drying cavityand a box door of the outer box body, and the horizontal metal mandrel is internally provided with a heating device, so that synchronous heating of the six surfaces of the drying cavity and the horizontal metal mandrel is realized. Before heating, air in the outer box body is replaced with dry air, efficient convection heat exchange between the pole coil and the gas medium is realized through horizontal circulating air conveying, and contact heat conduction and temperature rise of an inner ring of the pole coil are realized through the pole coil winding drum. Compared with the prior art, thehighly efficient drying method for the pole coil has higher efficiency, reduces the temperature difference at different coil diameters of the pole coil, and has better temperature uniformity.

Description

technical field [0001] The invention relates to the technical field of preparation of power lithium-ion batteries, in particular to a method for efficiently drying lithium-ion battery cathode and anode coils and a drying device thereof. Background technique [0002] In recent years, with the rapid development of the electric vehicle industry, the demand for power batteries is increasing day by day, and consequently, the demand for power battery capacity increase is also more urgent. In order to meet the performance of the battery cell, the pole piece needs to be dried and dehydrated during the preparation process of the power battery cell, and the water content is usually reduced to the ppm level to meet the process requirements. Conventional drying ovens are mainly of external heating blast type and internal heating blast type. Usually, the drying method and drying device for vacuum baking of pole rolls usually have the following deficiencies: [0003] 1. The temperature u...

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Problems solved by technology

[0010] Aiming at the above existing problems of pole roll baking, the present invention provides a high-efficiency pole roll drying method and its device to solve the problems of low drying efficiency and poor temperature rise consistency when pole piece coils are baked

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