Electrode Sheet Roll Press Control for Thickness Stability
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Solution Overview
Problem
The thickness of an electrode sheet can change after pressing due to factors like spring back, making it difficult to control the thickness effectively by adjusting press conditions based on immediate post-pressing measurements.
Innovation Solution
An electrode sheet manufacturing device with a pair of press rolls, a press pressure adjusting mechanism, temperature sensors, and a controller that adjusts press pressure based on the surface temperature of the rolls to maintain uniform thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If press condition adjustment is based on immediate post-pressing thickness measurements, then thickness control can be implemented, but thickness changes occur after pressing due to spring back
Solution Approach 1:
The system performs preliminary measurement of roll surface temperature before pressing, and uses this information to pre-adjust the press pressure. By anticipating the thermal state of the rolls and adjusting press conditions in advance, the system compensates for spring back effects that would otherwise cause thickness variations after pressing.
Solution Approach 2:
The system continuously monitors roll surface temperature and uses this feedback to dynamically adjust press pressure. The temperature information provides real-time feedback about the thermal state of the rolls, allowing the control system to optimize press conditions and maintain consistent thickness control despite changes in roll temperature during operation.
2Manufacturing precision
If press pressure is increased to compensate for thermal expansion, then gap between rolls can be maintained, but energy consumption increases
Solution Approach 1:
The system dynamically changes the press pressure parameter based on real-time roll surface temperature measurements. When rolls are cooler, lower press pressure is applied; when rolls are warmer and expand, press pressure is adjusted accordingly. This dynamic parameter adjustment maintains consistent gap uniformity while avoiding unnecessary energy consumption that would result from continuously high press pressure.
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 device effectively controls the thickness of the electrode sheet by detecting roll surface temperatures and adjusting press pressure, ensuring consistent thickness even after pressing, thereby addressing the issue of thickness changes.
Implementation Method 1
the roll is deformed through thermal expansion by heat generated at the bearing portion of the roll
Implementation Method 2
heat is generated in a bearing portion of each of the press rolls and the heat is transferred to both of end portions of the press roll
Data Source
AI summary
An electrode sheet manufacturing device includes a pair of rolls that press an electrode active material layer formed on an electrode sheet, a press pressure adjusting mechanism that adjusts a press pressure of the pair of rolls, a temperature sensor that detects a surface temperature of at least one of the pair of rolls, and a controller. The controller is configured to adjust the press pressure, based on the surface temperature of the at least one of the pair of rolls detected by the temperature sensor.