A kind of slit die head for fluid coating of lithium ion battery

Abstract

The invention discloses a slit type die head for coating lithium ion battery fluid. The slit type die head comprises an upper die head, a lower die head and a die head gasket, wherein a slit outlet is formed in a slit between the front ends of the upper die head and the lower die head, a feed opening is formed in the back end of the upper die head, and a fine tuning screw rod which is used for adjusting the opening height of the slit outlet is arranged on the top of the front end of the upper die head; a liquid storage cavity and a pressure stabilizing cavity are formed in the top end surface of the lower die head along the length direction of the top end surface of the lower die head, and the liquid storage cavity and the pressure stabilizing cavity are connected by virtue of a flow stabilizing platform; the feed opening communicates with the liquid storage cavity by virtue of a feed flow channel. According to the slit type die head, remaining bubbles in fluid slurry are effectively eliminated, the fluid flowability of different positions is improved, the height of the slit outlet can be adjusted, different types of fluid can be coated, the extended-foil defect of coating is eliminated, the uniform coating thickness of pole pieces is guaranteed, and the qualified rate of products is increased.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a slit die head for fluid coating of lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in modern electric vehicles, energy storage and other fields due to their high energy density and long cycle life. The coating of the positive and negative electrodes of lithium batteries is a key process of battery production, and the coating speed and quality of the electrodes determine the output and quality of battery products; in addition, the output and quality of the electrodes are affected by the coating machine in the production process. Influence, and the coating machine head, as the most important component of the coating machine, directly determines the quality of the coated pole piece. In the pole piece coating process, due to the different coating principles and equipment of the coating applied to the substrate, the pole piec...

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Problems solved by technology

In the pole piece coating process, due to the different coating principles and equipment of the coating on the substrate, the pole piece manufacturing process is cumbersome and inefficient, resulting in poor thickness uniformity of the pole piece, which seriously affects the capacity of the finished battery Consistency, for example, due to incomplete defoaming of the slurry, poor sealing of the slurry conveying system and feeding system, etc., it is easy to cause bubbles and foil defects on the coated pole piece; second, due to equipment fluctuations, environmental changes, etc. Factors, the viscosity of the battery slurry fluctuates during the coating process, resulting in fluctuations in the fluid extrusion volume at the outlet of the gap, resulting in poor consistency in the thickness of the battery pole piece

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