Electrochemical Cell Bundle Assembly for Stack Rework and Weak Cell Isolation
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Solution Overview
Problem
Existing electrochemical cell stacks face challenges in manufacturing and maintenance due to the risk of failures in larger stacks, which limit operation and reduce stack life. Current designs either duplicate hardware or struggle with accessing and bypassing weak cells, leading to yield loss and additional failure modes.
Innovation Solution
The introduction of a bundle assembly architecture in electrochemical cell stacks, featuring a top and bottom bundle plate with electrochemical cell layers in between, allows for modular assembly and easier maintenance. This design enables standardized work scope, hydration, and testing at the bundle level, reducing the risk of failures and improving yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If larger stacks with more layers are assembled to increase output, then stack productivity increases, but the risk of failures increases and reliability decreases
Solution Approach 1:
The stack is divided into multiple independent bundle assemblies, each containing a subset of cell layers. These bundle assemblies are connected in series through bundle plates, creating modular units that can be independently managed. This segmentation reduces the overall failure risk by isolating potential failure points within individual bundles rather than affecting the entire stack.
2Device complexity
If traditional stack design is used to maintain simplicity, then device complexity is low, but ease of repair deteriorates due to difficulty in accessing and replacing weak cells
Solution Approach 1:
The stack is divided into multiple independent bundle assemblies, each containing a subset of cell layers. These bundle assemblies are connected in series through bundle plates, creating modular units that can be independently managed. This segmentation reduces the overall failure risk by isolating potential failure points within individual bundles rather than affecting the entire stack.
Solution Approach 2:
Different regions of the stack serve different functions: bundle plates provide electrical connection and structural support, while cell layers provide electrochemical function. The bundle assembly architecture creates localized functional zones that can be independently accessed and maintained.
3Ease of repair
If decomposition and separation of each layer is performed for rework, then ease of repair improves, but loss of time increases due to significant yield loss
Solution Approach 1:
The stack is divided into multiple independent bundle assemblies, each containing a subset of cell layers. These bundle assemblies are connected in series through bundle plates, creating modular units that can be independently managed. This segmentation reduces the overall failure risk by isolating potential failure points within individual bundles rather than affecting the entire stack.
Solution Approach 2:
The bundle assembly with the weak cell is extracted from the stack as a complete unit and replaced with a new bundle assembly. This extraction approach eliminates the need to disassemble and reassemble individual cell layers, significantly reducing rework time and preventing contamination of other healthy cells.
4Productivity
If shorting of individual weak cell is attempted to maintain stack output, then productivity is maintained, but device complexity increases due to limited accessibility and high current requirements
Solution Approach 1:
The stack is divided into multiple independent bundle assemblies, each containing a subset of cell layers. These bundle assemblies are connected in series through bundle plates, creating modular units that can be independently managed. This segmentation reduces the overall failure risk by isolating potential failure points within individual bundles rather than affecting the entire stack.
Solution Approach 2:
The bundle assembly with the weak cell is extracted from the stack as a complete unit and replaced with a new bundle assembly. This extraction approach eliminates the need to disassemble and reassemble individual cell layers, significantly reducing rework time and preventing contamination of other healthy cells.
Data Source
AI summary
Electrochemical cell stacks that utilize a bundle assembly architecture to improve manufacturing, maintenance, and rework capabilities. Bundle assemblies include a top bundle plate, a bottom bundle plate, and a plurality of electrochemical cell layers disposed between the top bundle plate and the bottom bundle plate, and wherein the plurality of electrochemical cell layers is electrically and fluidly connected to the top bundle plate and the bottom bundle plate.