Electrode Slurry Degassing and De-Ironizing for Uniform Battery Coating
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Solution Overview
Problem
Existing secondary battery manufacturing processes face challenges in achieving uniform application of positive electrode slurry due to high viscosity, which can lead to electrode plate rupture, and issues with iron contamination and air bubbles that affect safety and efficiency.
Innovation Solution
A manufacturing apparatus and method involving a stirring device, de-ironizing device, and degassing device to control slurry viscosity, remove iron components, and eliminate air bubbles, ensuring optimal slurry application onto the electrode plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the positive electrode slurry has high viscosity, then the slurry can maintain its structure during handling, but it cannot be uniformly applied onto the electrode plate and may cause plate rupture
Solution Approach 1:
The patent applies parameter changes by controlling the viscosity of the positive electrode slurry within a specific range (100 cP to 500 cP) and managing the solid concentration (60 wt% to 80 wt%) to achieve optimal application properties while maintaining structural stability during handling
Solution Approach 2:
The patent implements preliminary action through a degassing process performed before coating, which removes air bubbles from the slurry to prevent defects during application, and through preliminary viscosity control to ensure uniform coating before the actual electrode plate formation
2Ease of manufacture
If iron components are present in the slurry, then the manufacturing process is simpler, but the battery safety and efficiency are compromised
Solution Approach 1:
The patent applies the extraction principle by introducing a de-ironizing device that removes iron components from the positive electrode slurry using a de-ironizing filter, thereby eliminating iron contamination that could compromise battery safety while maintaining manufacturing feasibility
Solution Approach 2:
The patent uses an intermediary approach by introducing a de-ironizing filter as a mediating component between slurry preparation and coating, which selectively removes iron particles without affecting other slurry components, thus ensuring safety without significantly complicating the overall process
3Productivity
If air bubbles are present in the slurry, then the mixing process is faster, but the electrode quality and safety are affected
Solution Approach 1:
The patent implements preliminary action by performing a degassing process before the coating step, which removes air bubbles from the slurry in advance to prevent electrode defects, thereby ensuring high electrode quality without significantly extending the overall production time
Solution Approach 2:
The patent applies the skipping principle by rapidly removing air bubbles through vacuum degassing or centrifugal separation in a short time frame, thus eliminating the harmful effect of air bubbles without adding significant time to the manufacturing process
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 apparatus and method enhance the safety and efficiency of secondary battery production by uniformly applying the positive electrode slurry, improving manufacturing stability and reducing defects.
Implementation Method 1
a vacuum degasser configured to remove air bubbles from the second positive electrode slurry in a vacuum
Implementation Method 2
a stirrer configured to stir the second positive electrode slurry from which the air bubbles have been removed
Data Source
AI summary
An apparatus for manufacturing an electrode of a secondary battery, the apparatus including a stirring device to generate a first positive electrode slurry, the stirring device configured to sir a mixed solution containing a positive electrode active material, a conductive agent, a binder, and an N-methyl-n-pyrrolidone (NMP) solvent, a de-ironizing device to generate a second positive electrode slurry, the de-ironizing device configured to perform a de-ironizing process on the first positive electrode slurry from the stirring device, a degassing device for generating a third positive electrode slurry, the degassing device configured to perform a degassing process on the second positive electrode slurry from the de-ironizing device and to stir the second positive electrode slurry, and a coating device to apply the third positive electrode slurry from the degassing device onto a positive electrode plate.