Electrode Sheet Drying with IR-Safe Temperature Sensing
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Solution Overview
Problem
Existing temperature management systems for lithium ion battery electrode sheets face inaccuracies in measuring the highest temperature region due to interference from infrared light radiated from surrounding structures, which affects the reliability of temperature estimation using radiation temperature sensors.
Innovation Solution
The electrode sheet drying device is designed with infrared heaters and radiation temperature sensors positioned on opposite sides, where the peak wavelength of infrared light from the heaters is set to be outside the detectable range of the sensors, and additional measures like housing with infrared-blocking materials and filters are used to minimize interference, allowing accurate temperature measurement of the back surface corresponding to the hottest front surface region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radiation temperature sensor is disposed downstream of the infrared heater to measure the electrode sheet temperature, then the temperature measurement can be performed, but the measurement precision deteriorates due to infrared light interference from surrounding structures
Solution Approach 1:
The patent changes the wavelength parameter of the radiation temperature sensor to detect only wavelengths longer than the peak wavelength of the infrared heater. This parameter selection filters out the harmful infrared light from the heater while allowing measurement of the electrode sheet temperature through thermal radiation at different wavelengths.
Solution Approach 2:
The electrode sheet itself acts as an intermediary between the infrared heater and the radiation temperature sensor. The heater heats the electrode sheet, which then radiates thermal energy at multiple wavelengths, allowing the sensor to indirectly measure the temperature while the electrode sheet blocks direct infrared light from the heater.
2Object-affected harmful factors
If a partition wall is disposed between the infrared heater and radiation temperature sensor to block infrared light, then the harmful infrared light interference is reduced, but the device complexity increases
Solution Approach 1:
Instead of adding a partition wall structure, the patent extracts only the necessary wavelength range for measurement by selecting a radiation temperature sensor with a specific detectable wavelength range. This removes the harmful infrared light interference through sensor selection rather than physical blocking structures.
3Productivity
If the radiation temperature sensor measures the back surface temperature corresponding to the front surface portion closest to the heater, then continuous temperature calculation is enabled, but measurement accuracy deteriorates due to temperature reduction during heat transfer
Solution Approach 1:
The system continuously monitors the temperature difference between the front surface (highest temperature region) and back surface of the electrode sheet. By measuring the back surface temperature and using the known temperature reduction pattern, the system can calculate and estimate the front surface temperature, providing continuous feedback for temperature control.
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 configuration enables continuous, accurate calculation of the temperature in the highest temperature region of the electrode sheet, reducing errors caused by infrared light interference and ensuring precise temperature control for effective drying without thermal degradation.
Implementation Method 1
an infrared heater disposed on one side of the electrode sheet: and a radiation temperature sensor disposed on the other side of the electrode sheet
Implementation Method 2
the radiation temperature sensor is disposed to be able to measure a temperature of a back surface of the electrode sheet corresponding to a back side of a front surface portion of the electrode sheet that is closest to the infrared heater
Data Source
AI summary
An infrared heater is disposed on one side of an electrode sheet transferred along a transfer path. A radiation temperature sensor is disposed on the other side of the electrode sheet to measure the temperature of the back surface of the electrode sheet corresponding to the back side of a front surface portion of the electrode sheet that is the closest to the infrared heater. The radiation temperature sensor is configured such that the peak wavelength of infrared light radiated to the surface of the electrode sheet by the infrared heater is not included in the detectable wavelength range of infrared light detected by the radiation temperature sensor.