Redox Flow Battery Cell Stack Assembly for Alignment and Flow Control
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Solution Overview
Problem
Previous redox flow batteries face issues with space inefficiencies and cell stack deformation due to material warping and misalignment, which restrict electrolyte flow and hinder scaling, leading to performance losses and increased manufacturing complexities.
Innovation Solution
The redox flow battery employs a cell stack assembly with mated membrane frame plates and bipolar frame plates forming flow channels, utilizing tongue and groove interfaces and adhesive paths to ensure efficient electrolyte distribution and reduce the likelihood of misalignment, along with serpentine shunt channels to minimize shunt current generation, and nested alignment bosses for quick and accurate assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cell stacks are scaled up in previous flow batteries, then power capacity increases, but material warping and misalignment occur causing electrolyte flow restriction
Solution Approach 1:
The cell stack is divided into modular units with standardized interfaces. Each cell assembly includes segmented components (membrane, electrodes, gaskets, frame) that can be independently manufactured and assembled, reducing cumulative tolerance errors and preventing warping in large-scale stacks.
Solution Approach 2:
Components are nested within each other in a hierarchical structure: membranes are nested between electrodes, electrode assemblies are nested within frames, and multiple cell assemblies are nested within the endplate-containing stack. This nested arrangement ensures proper alignment and prevents misalignment issues during scaling.
2Quantity of substance
If cell stacks are scaled up in previous flow batteries, then power capacity increases, but manufacturing complexity increases due to alignment issues
Solution Approach 1:
The frame structure serves multiple functions simultaneously: it provides mechanical support, defines flow channels, enables alignment through standardized interfaces, and facilitates assembly. This multi-functionality reduces the number of separate components and simplifies manufacturing processes.
Solution Approach 2:
Alignment features (tongues and grooves) and sealing paths are pre-formed during component manufacturing rather than requiring precise alignment during assembly. This preliminary action ensures proper positioning and reduces manufacturing complexity during stack assembly.
3Ease of manufacture
If conventional cell stack designs are used, then assembly is simple, but space efficiency is poor and deformation occurs under compression
Solution Approach 1:
Multiple functions are merged into integrated components: the frame structure combines mechanical support, flow channel definition, and alignment features. The gasket integrates sealing, spacing, and compression distribution functions. This merging improves space efficiency while maintaining assembly simplicity.
Solution Approach 2:
The cell stack uses composite construction with different materials optimized for specific functions: conductive materials for electrodes, porous materials for flow channels, elastomeric materials for gaskets, and rigid materials for frames. This composite approach enables compact design while maintaining structural integrity under compression.
4Reliability
If tight tolerances are applied to prevent misalignment, then electrolyte flow improves, but manufacturing cost increases
Solution Approach 1:
The gasket acts as an intermediary component between rigid parts, providing compliance and tolerance compensation. It mediates the interface between components, ensuring proper sealing and alignment without requiring tight manufacturing tolerances, thereby reducing manufacturing costs while maintaining reliable electrolyte flow.
Data Source
AI summary
A redox flow battery and battery system are provided. In one example, the redox flow battery includes a cell stack assembly interposed by two endplates and comprising a plurality of mated membrane frame plates and bipolar frame plates forming, at a mated interface, a plurality of negative and positive flow channels configured to distribute negative and positive electrolyte into a plurality of bipolar plates. In the battery a membrane is coupled to each of the plurality of membrane frame plates and positioned sequentially between two of the bipolar plates included in the plurality of bipolar plates.