Stepped Pouch Cell Sealing Layout for Higher Packaging Density
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Solution Overview
Problem
Existing electrochemical cell packaging technologies face challenges in maximizing packaging efficiency and energy density due to unused space and difficulties in folding side seals without increasing thickness or causing leaks.
Innovation Solution
A pouched energy storage device design featuring a cell housing portion with an indentation for smaller electrodes and a sealed portion that folds into this indentation, reducing unused space and maintaining package thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealed portion is made thicker to ensure sealing reliability, then the packaging efficiency decreases and the device thickness increases
Solution Approach 1:
The sealed portion is folded into the indentation formed by the stepped region, nesting the sealed portion within the existing package volume. This allows the sealed portion to be thick enough for reliable sealing without increasing the overall device thickness, as it occupies space that would otherwise be unused.
Solution Approach 2:
The sealed portion is folded in a direction perpendicular to the main package plane, utilizing the depth dimension created by the indentation. This dimensional change allows the sealed portion to achieve necessary thickness for reliability while maintaining a thin overall package profile.
2Length of moving object
If the sealed portion is folded to reduce device thickness, then unused space increases and packaging efficiency decreases
Solution Approach 1:
The sealed portion is nested within the indentation created by the stepped region, utilizing otherwise wasted space. This nesting approach allows the sealed portion to be folded without creating additional unused space, as it occupies the void created by the non-uniform electrode stack.
Solution Approach 2:
The indentation is specifically positioned and sized to match the location and dimensions of the folded sealed portion. This local adaptation ensures that the folded sealed portion fits precisely into the available space without creating gaps or unused regions.
3Productivity
If the sealed portion is made thinner to improve packaging efficiency, then sealing reliability decreases and leaks may occur
Solution Approach 1:
The sealed portion achieves sufficient effective thickness for reliable sealing by being folded into the indentation, where it is compressed and supported by the surrounding structure. This nesting provides mechanical support that enhances sealing reliability even when the unfolded sealed portion would be thin.
Solution Approach 2:
The folded sealed portion creates a curved or multi-layered sealing structure within the indentation, which distributes stress more evenly and enhances sealing effectiveness compared to a flat, thin sealed portion.
4Productivity
If conventional packaging is used without indentation, then unused space increases but the structure is simpler
Solution Approach 1:
The package structure is segmented into distinct regions: the main housing portion and the indentation region. This segmentation allows the indentation to be added as a localized feature rather than redesigning the entire package structure, minimizing the increase in overall complexity.
Solution Approach 2:
The indentation is a localized structural feature positioned specifically to accommodate the folded sealed portion. This local modification to the package structure achieves improved packaging efficiency without requiring complex changes to the overall package design.
Data Source
AI summary
A pouched energy storage device can include a cell housing portion and a sealed portion. The device can also include a stack of electrodes housed within an inner region of the cell housing portion. Each electrode can have dimensions of width, length, and thickness. One or more electrodes can have at least one of the dimensions smaller than a corresponding dimension of other electrodes in the stack of electrodes. The device can also include an indentation on the cell housing portion adjacent the sealed portion. The indentation can form a stepped region in the inner region that is complimentary to the one or more electrodes having at least one of the dimensions smaller than a corresponding dimension of other electrodes in the stack of electrodes. The sealed portion can be folded onto the cell housing portion so that at least a part of the sealed portion resides in the indentation.