Electrode Stack Clamping for High-Throughput Battery Cell Assembly
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Solution Overview
Problem
Current clamping systems for lithium-ion battery production face challenges in throughput speed and precision during the mass production of individual electrode stacks, particularly due to form instability and the need for precise handling, which is not adequately addressed by existing clamping technologies.
Innovation Solution
A clamping system with a base plate, pressure plate, and clamping elements that securely hold electrode foils in position, allowing for automated processing, featuring adjustable clamping elements and differentiated attachment points for integration with manufacturing apparatuses, ensuring precise positioning and flexibility across various production stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gripping system is used to fix the battery cell stack in position, then the stack can be held securely, but the handling system is blocked for all downstream manufacturing steps, reducing throughput speed
Solution Approach 1:
The gripping function is extracted from a separate handling system and integrated directly into the manufacturing apparatus. The clamping elements are built-in components of the production equipment rather than external grippers, allowing the stack to be secured during processing without blocking downstream operations.
Solution Approach 2:
The clamping elements act as intermediaries between the manufacturing apparatus and the electrode stack. They provide secure positioning during critical operations while allowing easy release, serving as a temporary mediator that enables both reliable handling and continuous production flow.
2Reliability
If clamping jaws connected to springs or clamping elements underneath the stack holder are used, then the stack can be held, but such systems are not suited for mass production of individual cells from electrode stacks due to sensitivity and linking requirements
Solution Approach 1:
The clamping elements are designed with multi-functionality to handle various stack configurations and production requirements. They can accommodate different stack sizes, provide adjustable clamping forces, and integrate with multiple types of manufacturing apparatus, making them universally applicable throughout the mass production process.
Solution Approach 2:
The clamping system incorporates dynamic characteristics with adjustable clamping forces and positions. The elements can adapt their configuration based on the specific stack being processed, providing the flexibility needed for mass production while maintaining secure holding during critical operations.
3Reliability
If single-sheet stacking method is used instead of winding, then cell capacity, durability and reliability are improved, but throughput is reduced by a factor of two to six compared to winding methods
Solution Approach 1:
The clamping elements secure the electrode stack in position before downstream manufacturing steps begin. This preliminary positioning action prevents misalignment and form instability during ultra-fast stacking, enabling high-speed single-sheet stacking to achieve both improved reliability and maintained throughput.
Solution Approach 2:
The system optimizes parameters such as clamping force, clamping position, and element configuration to enable ultra-fast stacking speeds. By adjusting these parameters, the single-sheet stacking method can operate at speeds that maintain both the reliability benefits and competitive throughput.
Data Source
AI summary
A clamping system for fixing in position a stack of electrode foils for the downstream manufacturing of battery cells, including a base plate, a pressure plate, at least two clamping elements and a receiving region for receiving the stack between the base plate and the pressure plate, the clamping elements clamping together the base plate and the pressure plate in a way that enables the electrode foils to be fixed in position in the receiving region, the clamping elements being located in the edge regions of the respective long sides of the plates outside of the receiving region, and/or the base plate and the pressure plate each having a plurality of, however, at least two, attachment points for connecting the clamping system to apparatuses of the downstream battery cell production in that the attachment points of a particular plate are differently embodied in the shape or size thereof.