Inductive Drying of Electrode Films on Metal Current Collectors
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Solution Overview
Problem
The existing methods for producing lithium-ion battery electrodes are time-consuming and energy-intensive due to the slow drying process of electrode films on metallic current collectors, often resulting in film residues and bubbles, as the solvent and suspending agents take longer to evaporate, especially when heated from the outside.
Innovation Solution
The method employs inductive heating of the metallic current collector to efficiently dry the electrode films by generating eddy currents, which heat the collector and subsequently the film from the inside, expelling the solvent and suspending agents, thereby accelerating the drying process and reducing residue formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrode films are dried using temperature-controlled gas heating from the outside, then the drying process can be performed with simple equipment, but the drying time is long and energy consumption is high
Solution Approach 1:
Instead of heating the electrode film from the outside surface using gas, the invention inverts the heating approach by using inductive heating to heat the metallic current collector from the inside, which then transfers heat to the electrode film. This internal heating method dramatically reduces drying time while maintaining equipment simplicity.
Solution Approach 2:
The invention replaces the mechanical/conventional thermal heating system (temperature-controlled gas) with an electromagnetic field-based inductive heating system. This substitution enables rapid heating of the metallic current collector, reducing drying time from hours to minutes while eliminating the need for complex gas flow control systems.
2Ease of manufacture
If electrode films are dried using temperature-controlled gas heating from the outside, then the heating process is simple to implement, but energy consumption is high
Solution Approach 1:
The invention replaces conventional thermal heating with inductive heating, which uses electromagnetic fields to directly heat the metallic current collector. This method is highly energy-efficient because it heats the substrate directly rather than heating a large volume of gas, reducing energy consumption while maintaining ease of implementation through automated induction heating systems.
Solution Approach 2:
The invention changes the heating parameter from external gas temperature control to internal electromagnetic field induction. This parameter change enables rapid and uniform heating of the current collector, significantly reducing the energy required to achieve the same drying effect compared to conventional external heating methods.
3Ease of manufacture
If electrode films are heated from the outside, then the heating method is straightforward, but film residues and bubbles remain
Solution Approach 1:
The invention inverts the heating direction by heating the metallic current collector from the inside through inductive heating, rather than heating from the outside surface. This internal heating approach ensures uniform temperature distribution throughout the film, preventing residue formation and bubble entrapment that occur with external heating methods.
Solution Approach 2:
The invention changes the heating parameter from external surface heating to internal volumetric heating of the current collector. This parameter change results in uniform heat distribution that prevents localized overheating and ensures complete solvent removal, eliminating film residues and bubbles while maintaining manufacturing simplicity.
4Use of energy by stationary object
If solvent and suspending agents are evaporated slowly, then the drying process is energy-efficient, but production productivity is low
Solution Approach 1:
The invention uses periodic alternating electromagnetic fields for inductive heating, which enables rapid and controlled evaporation of solvents. This periodic action allows for fast drying (improving productivity) while maintaining energy efficiency through controlled heating cycles that prevent excessive energy consumption.
Solution Approach 2:
The invention replaces slow conventional thermal evaporation with rapid inductive heating, which uses electromagnetic fields to directly heat the current collector and accelerate solvent removal. This substitution dramatically increases production speed while maintaining energy efficiency through targeted and controlled heating of only the necessary components.
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 significantly reduces the drying time, prevents film residue and bubble formation, and enhances the efficiency of the electrode film production by heating the current collector internally, ensuring faster and more uniform drying of the electrode films.
Implementation Method 1
the electrode film is inductively heated by an induction device
Implementation Method 2
heating the collector and subsequently the film from the inside, expelling the solvent and suspending agents
Data Source
Figure 1~2
AI summary
In a method for thermally treating at least one electrode film (111a; 111b) on a metal current collector (110), said current collector is inductively heated. The invention relates to the method as such as well as to a device (100) suitable for carrying out the method.