Flow Battery Piping Layout for Inter-Stack Shunt Current Mitigation
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Solution Overview
Problem
Existing flow battery systems face inefficiencies due to inter-stack shunt currents and fluidic pressure drops, with maximizing fluidic piping length mitigating shunt currents but increasing pressure drops, and vice versa, posing a challenge in balancing both issues.
Innovation Solution
The implementation of fluidic piping with U-shaped bends within the enclosure to extend piping length and reduce shunt currents, combined with a controller that alternates electrolyte solution flow between shorter and longer paths based on operating power to manage pressure drops and shunt currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the length of fluidic piping is maximized, then inter-stack shunt currents are mitigated, but fluidic pressure drops increase
Solution Approach 1:
The system divides the fluidic piping into multiple segments with different lengths. The flow path is segmented into a first fluidic path and a second fluidic path, where the first path has a first length and the second path has a second length greater than the first length. This segmentation allows the system to optimize for different operating conditions by selecting appropriate path lengths.
Solution Approach 2:
The system dynamically switches between different fluidic path lengths based on operating conditions. A controller alternates flow of electrolyte solution between shorter and longer fluidic piping paths depending on the operating power of the flow battery. This dynamic adaptation resolves the contradiction by adjusting piping length according to real-time needs.
2Loss of energy
If external fluidic piping is used to maximize piping length, then shunt currents are reduced, but system geometry is limited and manufacturing becomes labor-intensive
Solution Approach 1:
The patent merges the fluidic piping with the battery stack structure itself. The flow paths are integrated within the battery pack, with the first and second fluidic paths formed as part of the battery stack architecture rather than as separate external components. This integration eliminates the need for complex external piping while still achieving the required path lengths.
Solution Approach 2:
The battery stack structure serves multiple functions: it provides the electrochemical cells for energy storage and simultaneously provides the fluidic piping pathways for electrolyte flow. The enclosure and internal structures of the battery stack are designed to dual purposes, eliminating the need for separate external piping systems.
Data Source
AI summary
Provided are flow batteries, comprising: a first reservoir containing a first electrolyte solution and one or more battery packs. A battery pack comprises a battery stack, an enclosure enclosing the battery stack, a first supply flow path, and a first return flow path. The first supply flow path comprises a substantially U-shaped bend such that a first portion of the first supply flow path and a second portion of the first supply flow path are positioned substantially parallel to each other and within the enclosure. The first return flow path comprises a substantially U-shaped bend such that a first portion of the first return flow path and a second portion of the first return flow path are positioned substantially parallel to each other and within the enclosure. These flow batteries are useful to mitigate inter-stack shunt currents.