Polymer Battery Electrode Assembly Alignment
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Solution Overview
Problem
The existing electrode assembly manufacturing processes for polymer secondary batteries, particularly the stacking and folding types, face challenges in precise alignment and stability due to complex processes and size mismatches between electrodes and separators, leading to inefficiencies and increased complexity.
Innovation Solution
A four-layered electrode assembly structure where electrodes and separators are stacked in a specific configuration, with at least one electrode having a size corresponding to 99.7% to 100% of the separator, ensuring precise alignment and stability, and optionally including auxiliary units for enhanced alignment and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrodes are made much smaller than separators in stacking type structure, then stacking process becomes simpler, but alignment precision deteriorates and stability decreases
Solution Approach 1:
The patent changes the size parameter of electrodes, making them substantially the same size as separators (95-105% of separator size) rather than much smaller. This parameter change enables precise alignment while maintaining simple stacking process, resolving the contradiction between manufacturing simplicity and alignment precision.
2Adaptability or versatility
If stacking type structure is used with separately stacked electrode units, then manufacturing flexibility is improved, but alignment precision deteriorates and too many processes are required
Solution Approach 1:
The patent merges the electrode and separator into a single integrated unit where the electrode is substantially the same size as the separator. This merging eliminates the need for separate alignment processes while maintaining manufacturing flexibility, resolving the contradiction between adaptability and alignment precision.
3Quantity of substance
If stacking/folding type structure is used with full cell or bi-cell, then electrode capacity is increased, but device complexity increases and alignment precision deteriorates
Solution Approach 1:
The patent segments the battery into multiple stacking units, each containing electrodes and separators of matched sizes. This segmentation allows increased electrode capacity through stacking while keeping each unit simple and easy to align, resolving the contradiction between electrode capacity and manufacturing complexity.
4Quantity of substance
If stacking/folding type structure is used with full cell or bi-cell, then electrode capacity is increased, but alignment precision deteriorates
Solution Approach 1:
The patent changes the size parameter relationship between electrodes and separators from electrode << separator to electrode ≈ separator (95-105% of separator size). This parameter change enables precise alignment in multi-capacity stacking configurations, resolving the contradiction between electrode capacity and alignment precision.
Data Source
AI summary
The present invention relates to an electrode assembly, and more specifically to an electrode assembly for a polymer secondary battery cell, including a cell stack part defined by stacking at least one radical unit having a four-layered structure in which a first electrode, a first separator, a second electrode and a second separator are stacked in turn, wherein at least one of the first electrode and the second electrode has a size corresponding to 99.7% to 100% of a size of the first separator or the second separator and thus is aligned to be coincided with or close to an end of the first separator or the second separator.