Flowing Electrolyte Battery Valve Pressure Control
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Solution Overview
Problem
Existing flowing electrolyte batteries, such as zinc-bromine batteries, face challenges in safely and efficiently stripping metallic zinc layers, are prone to damage from electrical stripping methods, and can suffer from uneven zinc deposits and overcharging, leading to reduced efficiency and potential cell damage.
Innovation Solution
A flowing electrolyte battery system with a valve that regulates pressure differences between positive and negative electrolyte circuits, allowing controlled flow to enable safe and efficient stripping and electrochemical polishing without external maintenance, and preventing overcharging by detecting pressure changes and opening the valve to discharge excess energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical current is used to strip the battery of metallic zinc layers, then stripping speed increases, but excessive heat is generated causing safety issues
Solution Approach 1:
The invention extracts the harmful electrical current method and replaces it with a chemical stripping method using electrolyte circulation. The valve system enables controlled mixing of positive and negative electrolytes that chemically strip zinc deposits without generating excessive heat, thus removing the harmful thermal effect while maintaining stripping functionality.
Solution Approach 2:
The valve acts as an intermediary mechanism that controls the interaction between positive and negative electrolytes. By opening the valve, it mediates the mixing of electrolytes to enable chemical stripping reactions. This intermediary approach allows controlled chemical stripping without direct electrical current, avoiding heat generation while achieving zinc layer removal.
2Productivity
If external maintenance equipment is used for stripping, then stripping capability is achieved, but device complexity and cost increase
Solution Approach 1:
The battery system performs self-stripping using its own internal components. The valve, already present in the electrolyte circulation system, is utilized to enable self-stripping by allowing controlled mixing of electrolytes. This eliminates the need for external maintenance equipment such as DC-DC converters or stripper circuits, reducing device complexity and enabling autonomous battery maintenance.
Solution Approach 2:
The valve is designed with multi-functionality, serving both normal electrolyte circulation control and stripping operations. By enabling the valve to perform dual functions, the invention eliminates the need for separate external stripping equipment, thereby reducing overall system complexity while maintaining stripping capability.
3Productivity
If electrical stripping is performed quickly from full charge, then productivity increases, but battery damage risk increases
Solution Approach 1:
The invention converts the harmful effect of rapid electrical stripping (heat generation and battery damage) into a beneficial chemical process. By using controlled electrolyte mixing through the valve, the system achieves rapid stripping through chemical reactions that do not generate excessive heat, thus converting a potentially harmful rapid process into a safe and effective operation.
4Manufacturing precision
If pressure differential control is implemented for valve operation, then stripping control precision improves, but system complexity increases
Solution Approach 1:
The invention uses hydraulic principles by utilizing pressure differential control through the existing electrolyte circulation system. The valve responds to natural pressure differences between positive and negative electrolyte circuits, enabling precise control of electrolyte mixing and stripping reactions without requiring complex external pressure control mechanisms. This hydraulic approach achieves precise control while minimizing additional system complexity.
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
Enables quick and safe stripping of zinc-bromine batteries without external equipment, reduces risk of damage, allows for controlled discharge and polishing, and prevents overcharging, ensuring robust operation across various charge states.
Implementation Method 1
the negative electrolyte circuit operates at a different pressure than the positive electrolyte circuit during an electrical charge or discharge operation, and the valve is opened and closed by changes in pressure differences between the positive and the negative electrolyte circuits
Implementation Method 2
A chemical reaction in a positive half cell, such as the half cell 145, during charging can be described according to the following equation: 2Br−→Br2+2e−
Implementation Method 3
a negative electrolyte circulation path 105 and an independent positive electrolyte circulation path 110
Data Source
AI summary
A flowing electrolyte battery can be quickly and safely electrically stripped using electrolyte. The battery includes: a stack comprising a plurality of electrodes; a negative electrolyte circuit coupled to the stack, for circulating negative electrolyte through the stack; a positive electrolyte circuit coupled to the stack, for circulating positive electrolyte through the stack; and a valve coupling the positive electrolyte circuit and the negative electrolyte circuit. The valve includes a closed configuration that prevents flow of electrolyte between the positive electrolyte circuit and the negative electrolyte circuit, and an open configuration that enables flow of electrolyte from at least one of the positive electrolyte circuit and the negative electrolyte circuit to the other of the positive electrolyte circuit and the negative electrolyte circuit. The valve is opened and closed by changes in pressure differences between the positive and the negative electrolyte circuits.