Battery Cell Stack Assembly with Offset-Cut Transport Sections
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Solution Overview
Problem
Existing methods for producing cell stacks for battery cells are slow, require complex handling, and struggle with positioning accuracy, leading to high cycle times and increased plant complexity.
Innovation Solution
A method involving the simultaneous feeding and cutting of material strips for anodes, cathodes, and separators, with offset cuts to allow continuous processing and precise alignment, followed by transverse separation to form partial stacks that are then combined and cut into complete cell stacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual sheets are prepared separately and positioned individually in magazines during stack formation, then positioning accuracy can be maintained, but cycle time increases significantly and plant complexity increases
Solution Approach 1:
The patent segments the material strips by creating individual transport sections with offset cuts, allowing each section to be processed and positioned independently while maintaining continuous material flow. This enables parallel processing of multiple sheets without requiring separate preparation steps for each sheet.
Solution Approach 2:
The transport sections are prepared in advance with offset cuts that create ready-to-use individual sheets while maintaining connection points for continuous transport. This preliminary segmentation allows sheets to be positioned individually during stacking without requiring separate preparation steps beforehand.
2Ease of manufacture
If multiple process steps are used for preparing, placing, combining, stacking and joining individual sheets, then complete cell stacks can be formed, but plant complexity and handling complexity increase
Solution Approach 1:
The patent combines multiple process steps into a single integrated system where material strips are fed, cut into transport sections, combined with other strips, and stacked in one continuous operation. The offset cut configuration allows all these operations to occur simultaneously without requiring separate installations for each step.
Solution Approach 2:
The transport sections serve multiple functions: they provide individual sheet separation, maintain continuous material transport, enable precise positioning, and facilitate stacking. This multi-functionality eliminates the need for separate handling, positioning, and stacking mechanisms.
3Ease of manufacture
If lamination process is used to form stacks by laminating cathode and anode sheets with separator films, then stacks can be formed, but production cost increases due to expensive lamination-capable separator films
Solution Approach 1:
The patent extracts the lamination requirement from the separator films, allowing standard non-lamination-capable separators to be used. By using offset cuts and individual positioning of transport sections, the system achieves stack formation without requiring the expensive lamination properties of the separator films.
Data Source
AI summary
A method for producing a cell stack (57) for battery cells (8) comprises at least the following steps: a) feeding in at least a first material strip (3) comprising a first material; b) feeding in a second material strip (22, 27) comprising a second material; c) making a first cut into the first material strip (3) and into the second material strip (22, 27), in each case forming at least one transport section (18) (having tensile strength), whereby the appertaining transport sections (18) are arranged offset in the crosswise direction relative to the material strip (3, 22, 27); d) combining the first material strip (3) and the second material strip (22, 27); and e) making a second cut, whereby the transport sections (18) of the first and second material strips (3, 22, 27) are cut independently of each other at separating cuts (14) that are offset, at least in the crosswise direction or in the lengthwise direction.