Electrode Stack Lamination Pressure Feedback for Uniform Bonding
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Solution Overview
Problem
Existing methods for manufacturing electrode assemblies in secondary batteries face challenges in applying uniform pressure during lamination, leading to inconsistent adhesion strength due to variations in roller distance and weight, which affects the quality of the stack.
Innovation Solution
An apparatus with pressure detection and control mechanisms on both sides of the lower roll adjusts the distance between upper and lower rolls to ensure uniform pressure application during lamination, using load cells and actuators to maintain consistent bonding of electrodes and separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the upper roller moves to the lower roller to adjust pressure, then the pressure can be adapted to different stack thicknesses, but the pressure becomes non-uniform due to thermal expansion and weight variations
Solution Approach 1:
The lower support part is divided into first and second support parts that independently support opposite ends of the lower roller. Pressure detection parts are installed at both ends to independently measure pressure, enabling segmented control of pressure distribution across the roller surface.
Solution Approach 2:
Pressure detection parts are specifically positioned at the first and second support parts to detect local pressure conditions at each end of the lower roller. This localized measurement enables targeted adjustment of pressure in different regions to achieve overall uniformity.
2Strength
If heat is applied to the stack for lamination, then bonding is achieved, but thermal expansion of rollers causes distance changes and pressure variations
Solution Approach 1:
Pressure detection parts continuously monitor the pressure applied to the stack at both ends of the lower roller. The control part receives this feedback and automatically adjusts the position of the upper roller to maintain uniform pressure, compensating for thermal expansion effects during the heating process.
3Device complexity
If a single pressure detection point is used, then the system is simple, but it cannot detect pressure variations across different locations of the roller
Solution Approach 1:
The pressure detection system is segmented into multiple independent pressure detection parts positioned at the first and second support parts. This segmentation allows simultaneous measurement of pressure at different locations along the roller, providing comprehensive pressure distribution data.
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 ensures uniform bonding and adhesion strength in electrode assemblies, preventing separator damage and potential short circuits, thereby enhancing the quality and performance of secondary batteries.
Implementation Method 1
a pressure detection part provided on the lower support part to measure a pressure applied to the lower roll, thereby detecting a pressure applied to the stack
Implementation Method 2
an upper roll and a lower roll, which are configured to press upper and lower portions of the stack, respectively
Implementation Method 3
the distance between the rollers changes due to thermal expansion of the upper and lower rollers through heat transfer between the upper and lower rollers by the heat applied to the stack
Data Source
AI summary
Discussed are an apparatus for manufacturing an electrode assembly, an electrode manufactured therethrough, and a secondary battery. The apparatus includes an upper and lower roll to press upper and lower portions of the stack, respectively; an upper support part to support the upper roll; a mover to allow the upper support part to move; a lower support to support both sides of the lower roll; a pressure detector provided on the lower support to measure a pressure applied to the lower roll, thereby detecting a pressure applied to the stack; and a controller to adjust the pressure applied to the stack by reflecting a pressure detection value detected in the pressure detector, the pressure detector comprising a first pressure detector to detect pressure applied to one side of the lower roll; and a second pressure detector to detect pressure applied to the other side of the lower roll.