Lithium ion battery pole piece coil vacuum drying oven

Abstract

The invention discloses a lithium ion battery pole piece coil vacuum drying oven, which mainly comprises an oven cover flange, a spiral annular flow channel jacket box body, an air blower, a plunger spring, a sliding unit, a vacuum pump, a reduction motor, screw handwheels, a lifting shaft, a lifting screw, spiral annular rib vacuum cavities, sliding guide pillars, linear bearings, guide pillar bases, electric heat pipes, a thrust bearing, a mechanical seal, a coupler, base flanges, pole piece coil meshed board bases, lifting nuts and the like. A horizontal suspension mode is improved into an axial vertical mode. A heat insulation structure of the box body is improved by using the characteristic that heated air has light specific weight and moves upwards and the transpiration of moisture is facilitated; a spiral annular flow channel jacket is arranged between the vacuum cavity and a shell, and the air blower at the inlet of a spiral annular flow channel is used for blowing wind to the spiral annular flow channel after the drying operation is completed, so that air in the spiral annular flow channel is rapidly subjected to forced convection with environment and rapidly cools the vacuum cavities; and the cooling conditions for pole piece coils are improved when the vacuum cavities are cooled, so that the time for waiting for cooling is shortened, and the production efficiency is improved.

Description

Technical field [0001] The invention relates to a lithium ion battery manufacturing process technology, in particular to a vacuum drying oven for lithium ion battery pole piece rolls. Background technique [0002] The manufacturing process of lithium-ion batteries consists of an extremely important process step, that is, after the positive and negative electrode slurry is coated on the surface of the current collector copper foil or aluminum foil, it needs to pass a drying process. The drying quality has a very important impact on the production of battery products. The technology is to hang the coated pole piece roll through the core through hole on a horizontal shaft for vacuum heating and drying. The defect of this method is that the weight of the pole piece roll is all pressed on the pole piece roll and the horizontal shaft. There are gaps between the compressed parts and other suspended parts. The parts with large gaps are easy to evaporate. The compressed parts are difficul...

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion battery manufacturing process consists of an extremely important process step, that is, after the positive and negative electrode slurry is coated on the surface of the current collector copper foil or aluminum foil, it needs to go through a drying process. The drying quality has a very important impact on the production of battery products. Existing The most advanced technology is to hang the coated pole piece roll on a horizontal shaft through the through hole of the roll core for vacuum heating and drying. Parts, there is a gap between the pressed part and other suspended parts. The water in the part with a large gap evaporates easily, and the water in the compressed part is difficult to evaporate under the same conditions. The final baking result appears in the same roll of pole piece material Some dry quality is better and some dry quality is relatively poor, that is to say, there is always the problem of unequal water content in the same batch of materials. As a result, the consistency of lithium-ion battery products is poor

[0003] The existing horizontal suspension mode of the pole piece roll still exists, and the defect of the thermodynamic principle can be proved from the evapotranspiration phenomenon that thermal transpiration is an upward movement, and the pole piece roll is placed horizontally, and the transpiration of the water vapor in the middle roll layer is a horizontal movement, so The thermal effect is not as good as the upward movement of transpiration, which will inevitably lead to problems such as long drying time, high energy consumption, and low efficiency of equipment resources.

[0004] In addition, the heat insulation layer of the existing drying box is a fixed structure located between the vacuum chamber and the outer shell. After baking, the powder still cannot be taken out of the drying box immediately, and it needs to wait for a long time, resulting in a long time for the equipment and low efficiency

Images