Ribbon Electrode Stack Cutting for Battery Production
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Solution Overview
Problem
Current methods for producing electrode stacks for lithium ion batteries are inefficient, requiring multiple steps and lengthy processes, which hinder the rapid production of high-quality battery cells for applications like electric vehicles and consumer electronics.
Innovation Solution
A method involving the cutting of ribbon-shaped elements to form plate-shaped segments and stacks, where ribbon-shaped anode, cathode, and separator elements are wound and cut using a cutting machine with offset blades, allowing for simultaneous production of multiple composite segments that are then stacked to form an electrode stack, reducing process time and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple cutting steps are performed sequentially to produce electrode segments, then manufacturing precision can be maintained, but production time increases significantly
Solution Approach 1:
The patent combines multiple sequential cutting operations into a single simultaneous cutting step. Multiple cutting blades are arranged in the transverse direction to cut all electrode layers at once, merging what would otherwise be multiple sequential cutting steps into one operation, thereby maintaining precision while dramatically reducing production time
Solution Approach 2:
The patent segments the cutting tool into multiple independent blades arranged in the transverse direction. Each blade performs the cutting function for a specific portion of the electrode stack simultaneously, allowing parallel execution of multiple cutting operations that would traditionally require sequential processing
2Reliability
If electrode layers are processed individually through multiple steps, then quality control is easier, but productivity decreases
Solution Approach 1:
The patent merges individual processing steps for multiple electrode layers into a single integrated operation. All layers are aligned and cut simultaneously in one process step, maintaining quality control through proper alignment mechanisms while achieving high productivity through parallel processing of all layers at once
Solution Approach 2:
The patent enables continuous processing by performing all cutting operations simultaneously in one continuous action rather than stopping between each cut. The multiple blades work together in a single continuous cutting motion, eliminating idle time between operations and maintaining continuous useful action throughout the process
3Device complexity
If a simple cutting machine is used, then device complexity is low, but it cannot perform simultaneous multi-segment cutting
Solution Approach 1:
The cutting machine is segmented into multiple independent blades arranged in the transverse direction, with each blade capable of cutting a specific portion of the electrode stack. This segmentation allows the machine to perform multiple cutting operations simultaneously, dramatically increasing productivity while keeping each individual blade simple in design
Solution Approach 2:
The cutting machine is designed with multi-functionality to perform multiple cutting operations simultaneously using a single device. The array of blades allows one machine to do the work of multiple sequential cutting operations, providing universal cutting capability across the entire electrode stack width in one operation
Data Source
AI summary
The invention relates to a method for producing an electrode stack for a battery cell, comprising the following steps: providing a ribbon-shaped anode element (45), providing a ribbon-shaped cathode element (46), providing a first ribbon-shaped separator element (16), producing a ribbon-shaped composite element (50) by means of joining together the cathode element (46), the anode element (45) and the first separator element (16), simultaneously cutting the composite element (50) so as to produce multiple plate-shaped composite segments, stacking the produced composite segments to form a segment stack, stacking multiple segment stacks. The invention relates to a battery cell that comprises at least one electrode stack that is produced according to the method in accordance with the invention.