Integrated Slot Die Coating for Flat Secondary Battery Electrodes
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Solution Overview
Problem
The formation of waves in electrode plates during the coating process and subsequent processes due to the different physical properties of the coated and insulation coated portions, leading to thickness inconsistencies.
Innovation Solution
An integrated slot die that simultaneously discharges mixture and insulating slurries, with the insulating slurry discharge portion protruding closer to the substrate than the mixture slurry discharge portion, allowing for precise adjustment of the insulation coated portion thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating material is coated at the edge of the mixture coated portion to prevent short circuits, then the reliability of the battery is improved, but waves are formed in the electrode plate during coating and subsequent processes due to thickness differences
Solution Approach 1:
The patent applies local quality by creating a protrusion at the specific location where insulating slurry is discharged. This protrusion structure allows the insulating material to be deposited with controlled thickness only at the edge region, while the central mixture coating maintains its own thickness characteristics. The protrusion height is specifically designed to compensate for the thickness difference between insulating and mixture coatings, ensuring both short circuit prevention and electrode plate flatness.
2Manufacturing precision
If the insulating slurry discharge portion protrudes closer to the substrate than the mixture slurry discharge portion, then the thickness of the insulation coated portion can be precisely adjusted, but the device complexity increases
Solution Approach 1:
The slot die is segmented into distinct discharge portions: a mixture slurry discharge portion and an insulating slurry discharge portion with a protrusion. This segmentation allows independent control of each slurry's discharge characteristics. The protrusion is a separate structural element that can be independently adjusted, enabling precise thickness control of the insulating coating without affecting the mixture coating process.
Solution Approach 2:
The patent employs parameter changes by adjusting the protrusion height of the insulating slurry discharge portion. By varying this geometric parameter, the thickness of the insulating coated portion can be precisely controlled. The protrusion height directly influences the gap between the discharge portion and substrate, thereby controlling the insulating slurry layer thickness to achieve the desired coating precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively controls the thickness of the insulation coated portion, preventing wave formation and ensuring a smooth coating process, thereby enhancing the quality of the electrode plates.
Implementation Method 1
The substrate is coated with a slurry-state mixture using a slot die
Implementation Method 2
a coating roller configured to contact the electrode substrate and the slot die
Data Source
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AI summary
The present disclosure relates to an apparatus and method for manufacturing an electrode plate of a secondary battery. In an embodiment a slot die that simultaneously discharges a mixture slurry and an insulating slurry. The slot die includes an insulating slurry discharge portion protruding toward a substrate more than a mixture slurry discharge portion, which enables fine adjust of a thickness of the insulation coated portion on the substrate.