Current Collector Preheating for Stable Electrode Coating
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Solution Overview
Problem
The manufacturing process of secondary battery electrodes faces challenges in achieving optimal mechanical properties, particularly toughness and elongation, in copper foils used as current collectors, due to variations in mechanical properties among different manufacturers and within the same manufacturer's products, necessitating a method to enhance these properties while minimizing a decrease in tensile strength.
Innovation Solution
A manufacturing apparatus and method involving a heating process for a sheet-shaped current collector at 120° C. to 150° C. for a specific time, as defined by the equation 6000D-38 ≤ M ≤ 6000D-10, where D is the heating temperature and M is the heating time, to reduce tensile strength by up to 5% and increase elongation by 15% to 60% and toughness by 20% to 50%, thereby improving mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the copper foil is stored at room temperature for self-annealing to stabilize tensile strength, then tensile strength is stabilized, but the annealing time is excessively long
Solution Approach 1:
The patent applies preliminary action by performing heating treatment before the coating process to pre-stabilize the copper foil's mechanical properties. This preliminary heating at controlled temperatures (e.g., 100-200°C) accelerates the annealing process, achieving tensile strength stabilization without requiring prolonged room temperature storage, thus resolving the time-stability contradiction
Solution Approach 2:
The patent changes the temperature parameter from room temperature storage to controlled heating temperatures (100-200°C) to accelerate the annealing process. This parameter change transforms the slow self-annealing process into a faster controlled heating process, achieving the same tensile strength stabilization in reduced time
2Loss of time
If heating is performed to shorten annealing time, then annealing time is reduced, but mechanical properties vary due to different manufacturer techniques
Solution Approach 1:
The patent establishes specific heating parameter ranges (temperature: 100-200°C, time: 1-60 minutes) that are optimized to achieve consistent mechanical properties across different copper foil manufacturers. These standardized parameters ensure reliable elongation improvement (15-60%) and toughness enhancement (20-50%) while limiting tensile strength reduction to within 5%, resolving the reliability issue
Solution Approach 2:
The patent applies partial action by performing heating treatment for a limited duration (1-60 minutes) at controlled temperatures, which is sufficient to achieve the desired mechanical property improvements without over-heating. This controlled partial heating ensures consistent results across different manufacturers while avoiding the variability that would result from excessive or uncontrolled heating
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 proposed solution effectively maximizes toughness and elongation while minimizing the decrease in tensile strength of the current collector, ensuring consistent mechanical properties and preventing disconnection issues during the roll-to-roll process, thereby enhancing the stability and performance of secondary battery electrodes.
Implementation Method 1
the copper foil has an unstable phase and thus a broad error range in mechanical properties, which is stored at room temperature for a long period of time to perform self-annealing in which tensile strength is stabilized, and in this case, the heating is performed for shortening the annealing time
Implementation Method 2
a heating part for heating the sheet-shaped current collector transferred from the unwinder at a temperature of 120° C. to 150° C. for a time (M) satisfying the following Equation 1
Data Source
AI summary
The present disclosure relates to a manufacturing apparatus of an electrode fora secondary battery including a heating part and a manufacturing method of an electrode for a secondary battery including a heating process, which performs heating of an electrode current collector before coating with an electrode active material slurry.