Mandrel Winding Speed Control via Cam Mechanism
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Solution Overview
Problem
The quality of electrode assemblies is compromised due to varying tension applied during the winding process, which is affected by the angle of the mandrel, leading to inconsistent winding speeds and tensions in rechargeable battery manufacturing.
Innovation Solution
An apparatus with a cam unit and power transmission system that adjusts the rotational speed of the mandrel to maintain consistent winding speed and tension, using a motor unit, cam follower, and power transmission rollers to ensure uniform winding of electrode plates and separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple motor unit is used to supply winding power, then the device complexity is reduced, but the winding speed cannot be constantly adjusted leading to quality degradation
Solution Approach 1:
The mandrel is designed to rotate at variable speeds rather than constant speed, allowing the winding speed to be dynamically adjusted during the winding process. This resolves the contradiction by enabling quality improvement through speed variation while maintaining a relatively simple overall device structure.
Solution Approach 2:
The rotational speed parameter of the mandrel is made changeable during operation, transitioning from a fixed parameter to a variable one. This allows the winding speed to be constantly adjusted to maintain consistent tension and improve winding quality without requiring a completely complex control system.
2Manufacturing precision
If the mandrel rotates at variable speeds, then the winding quality is improved through constant tension, but the device complexity increases due to additional cam units and power transmission mechanisms
Solution Approach 1:
A cam unit is introduced as an intermediary mechanism between the motor unit and the mandrel. The cam unit converts the motor's rotation into the required variable speed rotation of the mandrel, mediating the speed control function and reducing the complexity of direct speed control mechanisms.
Solution Approach 2:
Complex electronic or mechanical speed control systems are replaced with a cam-based mechanical timing mechanism. The cam profiles are designed to provide the desired speed variation pattern, substituting complex control systems with a simpler mechanical solution that achieves the same effect.
3Device complexity
If tension is allowed to vary during winding, then the device complexity is reduced, but the electrode assembly quality degrades due to inconsistent winding
Solution Approach 1:
The cam unit is pre-designed with specific profiles that anticipate the required speed variations to maintain constant tension. By pre-programming the speed variation pattern into the cam geometry, the system proactively compensates for tension variations before they affect quality, eliminating the need for complex real-time feedback 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
The apparatus ensures consistent winding speed and reduced tension variation, thereby improving the quality and reliability of the electrode assembly by maintaining optimal winding conditions throughout the process.
Implementation Method 1
a cam unit connected to the motor unit and configured to rotate when the motor unit supplies the winding power
Implementation Method 2
The power transmission unit may include a first roller, a second roller, and a belt
Data Source
AI summary
An apparatus for winding an electrode assembly includes a winding unit including a motor unit to supply a winding power; a cam unit connected to the motor unit and configured to rotate when the motor unit supplies the winding power; a power transmission unit connected to the cam unit; and a mandrel connected to the power transmission unit and configured to receive a first electrode plate, a second electrode plate, and a separator wound thereon.