Valveless Vanadium Flow Battery Electrolyte Mixing
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Solution Overview
Problem
Conventional vanadium redox flow batteries are limited by complex hydraulic circuits with valves that are prone to malfunctions and increase costs, making them unsuitable for mobile applications and requiring frequent electrolyte mixing to maintain concentration balance, which renders the battery non-operational and necessitates energy expenditure for recharging.
Innovation Solution
A simplified vanadium redox flow battery design that eliminates valves and uses a mixing pump embedded in the bypass pipe to mix electrolytes, reducing hydraulic complexity and potential failures, while maintaining electrolyte levels equilibrium through a connection pipe above the liquid levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydraulic circuits with valves are used for electrolyte mixing, then electrolyte concentration balance can be maintained, but device complexity increases and reliability decreases due to valve malfunctions
Solution Approach 1:
The patent removes valves from the hydraulic circuit entirely, extracting the problematic component that caused malfunctions and complexity. The electrolyte mixing function is achieved through a simplified bypass pipe connection between tanks without any valve mechanisms, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The system uses the natural circulation and level differences of electrolytes between tanks to achieve automatic mixing through the bypass pipe. The hydraulic circuit serves itself by utilizing the existing flow dynamics and pressure differences without requiring external control valves, thereby improving reliability while reducing complexity.
2Productivity
If frequent electrolyte mixing is performed to maintain concentration balance, then battery performance is maintained, but energy expenditure increases and operational readiness is reduced
Solution Approach 1:
Instead of continuous or frequent mixing operations that consume energy and reduce operational readiness, the patent implements periodic mixing only when concentration imbalance occurs. The bypass pipe system enables mixing on-demand rather than continuously, reducing energy expenditure while maintaining productivity when needed.
Solution Approach 2:
The electrolyte mixing system utilizes natural hydraulic circulation and level equalization between tanks to perform mixing automatically when required. This self-service mechanism eliminates the need for energy-intensive active pumping and mixing operations, thereby conserving energy while maintaining operational readiness through periodic intervention only when concentration balance is compromised.
3Ease of operation
If valves are used in hydraulic circuits for electrolyte control, then electrolyte flow direction can be changed, but the likelihood of malfunctions increases
Solution Approach 1:
The patent extracts and removes all valve components from the hydraulic circuit, eliminating the source of malfunctions. Electrolyte flow direction and control are achieved through the bypass pipe configuration and natural hydraulic principles rather than mechanical valves, directly improving reliability while maintaining operational capability.
Solution Approach 2:
The system uses hydraulic principles and fluid dynamics to control electrolyte flow direction through the bypass pipe connection between tanks. By utilizing pressure differences, level gradients, and natural circulation patterns, the patent achieves flow control without mechanical valves, thereby eliminating valve-related malfunctions while maintaining ease of operation through passive hydraulic control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution results in a more reliable, cost-effective, and safer battery design that reduces the likelihood of malfunctions and energy expenditure during recharging, enabling efficient electrolyte mixing and maintaining operational readiness.
Implementation Method 1
a mixing pump (14) embedded in the bypass pipe (13), which in the operation mode is turned off, whereas in the mixing mode the mixing pump (14) is turned on, pumping the negative electrolyte (4) being contained in the negative tank (2) into the positive tank (3)
Implementation Method 2
When mixing mode is ended and the pump (14) is turned off, by means of the bypass (13) the equalization of the levels in the two tanks occurs
Data Source
AI summary
A flow battery has an electrochemical stack, a positive electrolyte, a negative electrolyte, a positive electrolyte tank, and a negative electrolyte tank. The positive electrolyte and the negative electrolyte are respectively stored in the positive and negative tanks. A positive electrolyte pump, a negative electrolyte pump, a mixing pump is embedded in the bypass pipeline or in a dedicate circuit. The positive and the negative tanks, are mutually connected by means of a connection pipe, said connection pipe is embedded just immediately above the electrolyte levels.