Electrode Mixture Layer Squeegee Gap Profile for Uniform Basis Weight
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Solution Overview
Problem
Existing production apparatuses for electrode mixture layers in batteries often result in uneven basis weight distribution, particularly at the ends of the layer, leading to potential distortion and reduced cycle and storage characteristics due to non-uniform charge and discharge reactions.
Innovation Solution
A production apparatus with a squeegee unit that adjusts the gap width continuously and includes a pre-forming unit to compress the granulated particle layer, ensuring uniform basis weight distribution by narrowing gaps at the ends and using inspecting units to monitor and adjust basis weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional squeegee unit with uniform gap is used to level granulated particles, then the leveling process is simple, but the basis weight at end portions becomes excessive causing non-uniform distribution
Solution Approach 1:
The squeegee unit is designed with different gap widths at different locations: a first gap width at end portions and a second gap width (wider than the first) at a central position. This local variation in gap quality compensates for the natural tendency of granulated particles to accumulate at ends, achieving uniform basis weight distribution across the electrode mixture layer.
Solution Approach 2:
The squeegee unit incorporates an adjusting mechanism that enables continuous adjustment of the gap width in the width direction. This dynamic adjustment capability allows the gap configuration to be optimized for different production requirements and maintains uniform basis weight distribution while adapting to various granulated particle characteristics and production speeds.
2Manufacturing precision
If the gap of squeegee unit is made adjustable, then the uniformity of basis weight can be improved, but the device complexity increases
Solution Approach 1:
The adjusting mechanism provides continuous adjustability of the gap width, transforming the static squeegee structure into a dynamic system. This allows real-time optimization of the gap configuration to maintain uniform basis weight distribution while accommodating variations in granulated particle properties, production speed, and electrode specifications.
Solution Approach 2:
The adjusting mechanism is configured to set the gap widths before the granulated particles pass through the squeegee unit. By preliminarily establishing the optimal gap configuration (narrower at ends, wider at center), the system proactively prevents basis weight non-uniformity rather than correcting it after formation.
3Manufacturing precision
If the gap at end portions is narrowed, then the basis weight uniformity improves, but the granulated particles may be blocked causing production issues
Solution Approach 1:
The squeegee unit implements a differentiated gap structure where only the end portions have narrowed gaps while the central region maintains a wider gap. This localized narrowing approach suppresses excessive basis weight at ends without creating complete blockages, allowing granulated particles to pass through while achieving uniform distribution.
Solution Approach 2:
The adjusting mechanism enables continuous optimization of the gap width at end portions. By dynamically tuning the gap size, the system finds the optimal balance between narrowing the gap sufficiently to control basis weight distribution and maintaining it wide enough to prevent particle blockage and ensure continuous production.
Data Source
AI summary
A production apparatus of an electrode mixture layer, comprising:a support unit;a feeding unit that feeds granulated particles on or above the support unit;a conveying unit that conveys the granulated particles that have been fed on or above the support unit;a squeegee unit that levels the conveyed granulated particles to form a granulated particle layer, the squeegee unit including a passage portion, and non-passage portions that are provided at both ends of the passage portion; anda forming unit that applies a load to the granulated particle layer to form an electrode mixture layer, whereinthe squeegee unit has a first adjusting mechanism capable of continuously changing a gap in a width direction so that gaps at end portions in the width direction of the passage portion are narrower than a gap at a central portion.