Capacitance Sensing of Residual Solvent for Targeted Electrode Drying
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing manufacturing processes for battery electrodes involve significant energy and cost in drying deposited media to remove residual solvent, as direct contact can damage the fragile media, and there is a need for efficient, non-contact methods to optimize drying profiles and reduce energy consumption.
Innovation Solution
Non-contact techniques using electromagnetic impedance, specifically capacitance measurement, to detect residual solvent in media on substrates, allowing for targeted drying and reducing energy usage by identifying areas that need further drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional contact-based drying methods are used to remove residual solvent, then the solvent removal is effective, but the fragile media is damaged and energy consumption is high
Solution Approach 1:
The patent replaces mechanical contact-based drying methods with electromagnetic field-based capacitance sensing and targeted drying. The capacitance sensor detects residual solvent through electromagnetic fields without physical contact, and the drying system applies energy only to detected wet areas, eliminating unnecessary mechanical contact and energy waste.
Solution Approach 2:
The system transitions from uniform whole-area drying to localized targeted drying. By using capacitance sensors to map residual solvent distribution, the drying system applies heat only to specific wet areas rather than the entire substrate, reducing overall energy consumption while maintaining effective solvent removal.
2Loss of energy
If uniform drying is applied to the entire substrate, then all areas are treated equally, but energy is wasted on already dry areas
Solution Approach 1:
The system implements a feedback loop where capacitance sensors continuously detect residual solvent levels across the substrate, and this information feeds back to control the drying system. The drying process is dynamically adjusted based on real-time moisture detection, ensuring energy is applied only where needed and drying progress is monitored until completion.
Solution Approach 2:
The capacitance sensing system performs preliminary detection of residual solvent distribution before the drying process begins and during intermediate stages. This advance information allows the system to plan and execute targeted drying sequences, avoiding unnecessary energy application to already dry areas.
3Measurement precision
If contact-based measurement methods are used to detect residual solvent, then measurement is direct, but the fragile media is damaged
Solution Approach 1:
The patent replaces mechanical contact-based measurement with electromagnetic field-based capacitance sensing. The capacitance sensor measures residual solvent through electromagnetic fields that penetrate the substrate without physical contact, eliminating mechanical damage while maintaining measurement capability through changes in dielectric properties.
Solution Approach 2:
The system uses electromagnetic fields as an intermediary to detect residual solvent. Instead of direct physical contact between the sensor and media, the electromagnetic field acts as a mediator that interacts with the dielectric properties of the solvent and substrate, providing indirect but non-invasive measurement.
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
Enables efficient detection of residual solvent without damaging the substrate, optimizing the drying process, and reduces energy usage by focusing heating on areas that require it, thus improving the manufacturing process efficiency and reducing energy consumption.
Implementation Method 1
arranging a conductive sensing plate to oppose the substrate; measuring a capacitance that includes the sensing plate and the substrate
Implementation Method 2
Non-contact techniques using electromagnetic impedance, specifically capacitance measurement, to detect residual solvent in media on substrates
Data Source
AI summary
A measurement apparatus includes at least one conductive sensing plate; and a capacitance measurement circuit connected to the sensing plate. The capacitance measurement circuit is configured to measure a capacitance that includes the sensing plate, a substrate, and a residual solvent on the substrate when the substrate is arranged below the sensing plate and provide information of the residual solvent on the substrate using the measured capacitance.