Electrode Unit Collector Thickness Ratio for Bending Control
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Solution Overview
Problem
The manufacturing process of electrode units through heating leads to bending due to differing thermal expansion coefficients of materials, which can be minimized by selecting collectors based on calculated stress to maintain structural integrity.
Innovation Solution
Selecting positive and negative electrode collectors with specific thickness ratios (1.8 to 3.1) to manage stress and contraction, ensuring effective bonding through a lamination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heating process is applied to bond electrode components, then bonding force between separator and electrode is improved, but bending of electrode unit occurs due to differential thermal contraction
Solution Approach 1:
The patent changes the physical parameter of collector thickness to control thermal contraction behavior. By selecting specific thicknesses for positive and negative electrode collectors, the thermal contraction during cooling is balanced, preventing bending while maintaining bonding strength achieved through the heating process.
Solution Approach 2:
The patent directly addresses thermal expansion/contraction differences between materials. By calculating and compensating for the different thermal contraction ratios of positive and negative electrode collectors during cooling, the design prevents bending through proper thickness selection of the collectors.
2Shape
If heating process is removed or reduced to prevent bending, then bending is minimized, but bonding force and stiffness are deteriorated
Solution Approach 1:
Instead of removing the heating process, the patent changes the collector thickness parameters to enable the heating process to proceed while preventing bending. This allows bonding force to be maintained through heating while the thickness optimization prevents shape distortion during cooling.
3Adaptability or versatility
If different materials with different thermal expansion coefficients are used in electrode unit, then functional requirements are met, but differential contraction causes bending during cooling
Solution Approach 1:
The patent applies local quality by making the collector thicknesses non-uniform and specifically optimized. The positive and negative electrode collectors have different thicknesses tailored to their respective materials' thermal properties, allowing each material to maintain its functional advantages while compensating for differential thermal contraction.
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
Prevents or minimizes bending of the electrode unit during cooling, maintaining structural integrity and bonding force.
Implementation Method 1
a bonding step of applying heat to bond the positive electrode, the separator, and the negative electrode to each other
Implementation Method 2
the complete electrode unit is cooled as a time elapses. Thus, when the electrode unit is manufactured through the heating process, the electrode unit is contracted as a time elapses
Data Source
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AI summary
Provided are an electrode unit and a method for manufacturing the electrode unit. According to the present invention, after the electrode unit is manufactured by using heat, bending of the electrode unit occurring by cooling the electrode unit may be eliminated or minimized. To achieve the abovementioned object, in the method for manufacturing the electrode unit according to an embodiment of the present invention, stress applied to the inside of each of the positive electrode collector and the negative electrode collector is calculated to reflect the calculated results, thereby selecting the positive electrode collector and the negative electrode collector.