Separator Film Web Motion Path to Reduce Acceleration Peaks
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Solution Overview
Problem
Existing battery cell stacking systems experience deviations in force exerted on the separator film web due to variations in acceleration caused by the relative movement between the table and feed device, leading to increased wear and stress on the machine components.
Innovation Solution
Implementing a two-dimensional relative movement with vertical and horizontal components to optimize the acceleration profile of the separator film web, reducing extreme acceleration values by adjusting the movement path and incorporating additional degrees of freedom in the table and feed device movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a linear or rotary table with rigid web guide components is used for separator film feeding, then the stacking process can be performed, but the acceleration of the separator film web becomes excessive due to the mass of moving components that must be accelerated and decelerated
Solution Approach 1:
The patent introduces a vertical dimension to the movement path of the separator film web, transforming the traditional horizontal linear or rotary table movement into a two-dimensional path that includes vertical displacement. This dimensional change allows the web to follow a trajectory that reduces acceleration peaks while maintaining the stacking function, effectively decoupling the acceleration control from the horizontal positioning requirements.
Solution Approach 2:
The patent employs dynamic movement profiles for the table and feed device, where the velocity and acceleration are continuously adjusted throughout the stacking cycle. By implementing time-varying motion control with optimized acceleration and deceleration phases, the system minimizes the inertial forces acting on the separator film web while still achieving the required positioning accuracy for electrode placement.
2Manufacturing precision
If the table and feed device move relative to each other to position electrodes, then stacking can be performed, but extreme acceleration values occur during direction reversal and positioning
Solution Approach 1:
The patent implements preliminary acceleration and deceleration phases before the actual positioning and direction reversal points. The movement profile is designed to reduce velocity gradually before reaching critical positions, preventing sudden acceleration spikes that would occur with immediate direction changes. This preliminary action ensures smooth transitions while maintaining positioning accuracy.
Solution Approach 2:
The patent replaces the traditional linear or angular movement paths with a curved, two-dimensional trajectory for the separator film web. This curved path eliminates sharp corners and abrupt direction changes, distributing the acceleration demands more evenly throughout the movement cycle. The smooth curvature of the path ensures continuous, controlled acceleration and deceleration while achieving the required electrode positioning.
Data Source
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AI summary
The invention relates to a method for controlling a relative movement between a table (T) of a battery cell stacking system and a feed device (W) with web guide components for a separator film web (S) of the battery cell stacking system, as well as to an associated control device. A proposed relative movement with movement components in the vertical direction superimposed on the movement in the horizontal direction changes the acceleration profile of the separator film web in such a way that the maximum values are reduced in magnitude.