Secondary Battery Winding Tension Control via Synchronous Profile
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Solution Overview
Problem
During the winding of secondary battery electrode assemblies, maintaining a constant tension of the base material is challenging, leading to potential deformation and increased failure rates.
Innovation Solution
A fabricating apparatus and method that includes a base material supplier, winder, and controller to synchronize the base material supply and mandrel rotation based on pre-stored profiles, using a tension measurer and base material supply amount measurer to maintain constant tension, with features like a dancer system and load cell for precise measurement and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the base material supply amount and mandrel rotation amount are not synchronously controlled, then the winding process is simple, but the tension of the base material varies causing deformation
Solution Approach 1:
The controller pre-stores a profile data that defines the relationship between mandrel rotation amount and base material supply amount. This preliminary preparation of control data allows the system to execute precise synchronous control without complex real-time calculations, thereby maintaining constant tension while avoiding excessive control system complexity
Solution Approach 2:
The tension measurer continuously measures the actual tension of the base material during winding and feeds this information back to the controller. The controller compares the measured tension with the target tension and adjusts the base material supply amount accordingly, ensuring tension consistency through closed-loop feedback control
2Manufacturing precision
If the base material supply amount is increased to match mandrel rotation, then tension consistency is improved, but measurement and control complexity increases
Solution Approach 1:
The controller acts as an intermediary that receives the target tension from the tension measurer and translates it into precise control signals for the base material supply amount. This intermediary role allows the system to achieve precise supply control without requiring direct complex measurement of the supply amount itself, as the controller uses the tension feedback to infer and adjust the appropriate supply rate
Data Source
AI summary
Provided is a fabricating apparatus for a secondary battery, the fabricating apparatus including: a base material supplier configured to supply a base material; a winder configured to wind the base material through a mandrel; and a controller configured to control a base material supply amount of the base material supplier and a mandrel rotation amount of the winder, wherein the controller is further configured to store a profile of the base material supply amount with respect to the mandrel rotation amount, and to synchronously control the base material supply amount and the mandrel rotation amount based on the profile.