Electrode Press Roll Temperature Control for Uniform Sheet Thickness
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Solution Overview
Problem
Existing electrode sheet manufacturing processes face challenges in maintaining consistent thickness due to thermal expansion of press rolls, leading to variations in the thickness of the electrode sheet, which cannot be effectively controlled by traditional thickness measurement-based adjustments.
Innovation Solution
A manufacturing device with a pair of press rolls, temperature sensors, and a controller that adjusts press pressure based on detected roll surface temperatures, using bend and cylinder pressure mechanisms, along with a coolant system to manage thermal expansion and maintain uniform thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If press rolls are used to continuously press the electrode sheet, then productivity is improved, but thermal expansion of the press rolls causes thickness variations in the electrode sheet
Solution Approach 1:
The patent applies parameter changes by adjusting the bend pressure as a control parameter to compensate for thermal expansion. The system changes the bend pressure parameter in response to temperature changes, thereby maintaining consistent press pressure and thickness uniformity during continuous production
Solution Approach 2:
The patent implements feedback control by using a thickness gauge to continuously measure electrode sheet thickness and adjusting the bend pressure based on these measurements. This closed-loop feedback system corrects thickness variations caused by thermal expansion in real-time during continuous production
2Manufacturing precision
If bend pressure is increased to correct thermal expansion, then thickness uniformity is improved, but the complexity of the press mechanism increases
Solution Approach 1:
The patent segments the press mechanism into two independent pressure control systems: a cylinder pressure mechanism for overall press force and a bend pressure mechanism for thermal expansion compensation. This segmentation allows each subsystem to be optimized and controlled independently, managing overall system complexity
3Manufacturing precision
If thickness measurement is used to adjust press conditions, then thickness control is improved, but the measurement is affected by post-pressing thickness changes
Solution Approach 1:
The patent applies preliminary action by adjusting the bend pressure in advance based on predicted thermal expansion before it causes significant thickness variations. The system proactively compensates for thermal effects rather than merely reacting to measured thickness deviations, improving control reliability
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 electrode sheet thickness by predicting and adjusting for thermal expansion, ensuring consistent thickness across the width of the sheet, enhancing productivity and quality by preventing roll surface damage and foreign matter contamination.
Implementation Method 1
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
Implementation Method 2
a coolant supplying device that supplies cooling water to the press roll
Implementation Method 3
a pair of bend cylinders that bend the rolls, wherein the pair of bend cylinders are arranged between a shaft portion of the upper press roll and a shaft portion of the lower press roll
Data Source
Figure 1~2
Figure 3
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AI summary
An electrode sheet manufacturing device includes a pair of rolls (61D,61U) that press an electrode active material laye formed on an electrode sheet, a press pressure adjusting mechanism (70) that adjusts a press pressure of the pair of rolls (61D,61U), a temperature sensor (91) that detects a surface temperature of at least one of the pair of rolls (61D,61U), 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 (61D,61U) detected by the temperature sensor (91).