Adjustable Extrusion Coating Die Head for Stable Slurry Flow
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Solution Overview
Problem
The existing extrusion coating devices for lithium batteries face instability in slurry extrusion speed due to varying viscosities and flow resistances, leading to fluctuations that affect coating consistency and quality.
Innovation Solution
An extrusion coating apparatus with a snap-fit die head configuration and adjustable gaskets between the die heads, which allows for precise adjustment of the flow channel dimensions and shape to accommodate different slurry characteristics, ensuring consistent extrusion speed by regulating the flow channel size and shape based on slurry viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the coating outlet width is increased to achieve wide coating width for production, then the coating width is improved, but the extrusion speed becomes unstable and fluctuation range increases
Solution Approach 1:
The flow channel cross-sectional area is designed to vary along its length, being larger near the feeding inlet and smaller near the discharging outlet. This non-uniform cross-sectional area distribution creates different flow resistance characteristics at different locations, which compensates for the instability caused by the wide outlet dimension alone.
Solution Approach 2:
The patent changes the geometric parameters of the flow channel, specifically the cross-sectional area, as a function of position along the flow direction. This parameter variation allows the system to accommodate different slurry viscosities and maintain stable extrusion speed across a wide coating outlet.
2Measurement precision
If the feeding inlet size is kept small for precise control, then the control precision is improved, but the coating width cannot be sufficiently widened
Solution Approach 1:
The flow channel is effectively segmented into different sections with varying cross-sectional areas. The feeding inlet section has a smaller cross-section for precise control, while the outlet section has a larger cross-section for wide coating width, with transition sections connecting them.
Solution Approach 2:
The solution transitions from a simple inlet-outlet dimensional relationship to a three-dimensional flow channel design where the cross-sectional area varies continuously or stepwise along the flow direction, adding a new dimension (area variation along length) to solve the contradiction.
3Adaptability or versatility
If the flow channel size is increased to accommodate high viscosity slurry, then the adaptability to different slurry viscosities is improved, but the extrusion speed becomes unstable
Solution Approach 1:
Different sections of the flow channel have different cross-sectional areas optimized for different flow conditions. The larger cross-section near the inlet accommodates high viscosity slurry entry, while the smaller cross-section near the outlet ensures stable extrusion speed, with transition sections providing gradual adaptation.
Data Source
AI summary
Embodiments of the present disclosure provide are an extrusion coating apparatus and a battery production system. The extrusion coating apparatus includes: a first die head and a second die head connected to each other in a snap-fit manner; a flow channel formed between the first die head and the second die head, the flow channel including a feeding inlet and a discharging outlet; and at least one gasket disposed between the first die head and the second die head. The at least one gasket is disposed at two sides of the flow channel in a direction from the feeding inlet to the discharging outlet. During production, sizes of the gasket may be adjusted based on a change in speed distribution at the discharging outlet, thereby adjusting the sizes of the flow channel. By adjusting the flow channel, extrusion speed distribution is further regulated to accommodate slurries with different viscosities.