Electrode Assembly Bonding With Induction Preheating for Uniform Adhesion
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Solution Overview
Problem
The existing methods for manufacturing electrode assemblies face challenges in achieving uniform adhesive force between electrodes and separators, leading to non-uniform performance due to inconsistent heat and pressure application during the bonding process.
Innovation Solution
The method involves inductively heating a stack of electrodes and separators using an induction heating unit, followed by controlled heating and pressing, to ensure uniform temperature distribution and adhesive force across the assembly, thereby improving the manufacturing efficiency and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat and pressure are applied to bond electrodes and separator in the stack, then adhesive force between electrodes and separator is improved, but manufacturing time and energy consumption increase
Solution Approach 1:
The patent replaces conventional thermal field bonding with a magnetic field-based bonding system. A magnetic field generating unit applies a magnetic field to the stack, inducing eddy currents in the electrodes and separator, which generates heat through resistive heating (Joule heating) to achieve bonding. This substitution of thermal field with magnetic field enables more efficient and uniform heating, reducing manufacturing time while maintaining adhesive force.
Solution Approach 2:
The patent changes the bonding parameters by introducing magnetic field intensity and frequency as control variables. By adjusting the magnetic field parameters (intensity, frequency, distribution), the patent optimizes the heating efficiency and uniformity, enabling faster bonding processes with reduced energy consumption while achieving the required adhesive force between electrodes and separator.
2Strength
If heat and pressure are applied to bond electrodes and separator, then adhesive force is improved, but uniformity of adhesive force across the stack deteriorates due to positional differences
Solution Approach 1:
The patent applies local quality by using a magnetic field generating unit that can create non-uniform magnetic field distributions tailored to different regions of the stack. The magnetic field intensity and distribution can be locally adjusted to compensate for positional variations in the stack, ensuring uniform adhesive force across all electrodes and separator regardless of their position. This localized control of magnetic field parameters resolves the uniformity issue inherent in conventional uniform heating methods.
Solution Approach 2:
By replacing the conventional thermal field application with a magnetic field-based system, the patent achieves more uniform energy distribution throughout the stack. The magnetic field penetrates the entire stack uniformly, inducing eddy currents and generating heat more evenly across all components, thereby improving the uniformity of adhesive force compared to conventional contact-based heating methods.
3Strength
If conventional heating and pressing is used to bond electrodes and separator, then adhesive force is achieved, but energy consumption increases
Solution Approach 1:
The patent replaces conventional thermal field bonding with a magnetic field-based bonding system. A magnetic field generating unit applies a magnetic field to the stack, inducing eddy currents in the electrodes and separator, which generates heat through resistive heating (Joule heating) to achieve bonding. This substitution of thermal field with magnetic field enables more efficient and uniform heating, reducing manufacturing time while maintaining adhesive force.
Solution Approach 2:
The magnetic field generating unit enables the stack to heat itself through induced eddy currents and resistive heating within the electrodes and separator materials. This self-heating mechanism eliminates the need for external heating elements and direct thermal energy input, significantly reducing energy consumption while achieving the required bonding strength.
4Strength
If stack is heated and pressed to bond electrodes and separator, then adhesive force is improved, but device complexity increases
Solution Approach 1:
The magnetic field generating unit serves multiple functions: it generates the magnetic field for inducing eddy currents, controls the heating process, and can be integrated with the existing pressing mechanism. This multi-functional approach reduces the need for separate heating elements, temperature sensors, and control systems required in conventional thermal bonding, thereby simplifying the overall device complexity while achieving improved adhesive force.
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
This approach reduces the time required for manufacturing, enhances the uniformity of the electrode assembly's performance, and minimizes air permeability deviations, resulting in a more consistent and efficient energy storage device.
Implementation Method 1
performing induction heating by inductively heating the stack
Data Source
AI summary
A method for manufacturing an electrode assembly includes assembling an electrode stack, applying induction heating to a central portion of the stack, and applying heat and pressure to top and bottom portions of the stack, so as to bond the component electrodes and separator of the stack to one another. An apparatus for manufacturing the electrode assembly includes a gripper configured to convey the stack from a stack table where the electrode stack is assembled to a heating and pressing unit where the heat and pressure are applied to the stack. An induction heating unit may be configured to perform the induction heating while the stack is held by the gripper, whereas the stack may not be held by the gripper while the heat and pressure are applied by the heating and pressing unit. The resulting electrode assembly has improved uniformity of properties, such as air permeability of the separator.