Metal-Air Cell Electrolyte Flow Layout for Lower Shunt Currents
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aluminum-air batteries face inefficiencies due to corrosion and uneven energy distribution, leading to reduced reaction rates and electricity production, as the Al(OH)3 coating on the anode decreases the reaction rate and specific energy, and shunt currents consume energy rather than delivering it.
Innovation Solution
The design includes a structured flow of alkaline aqueous electrolyte solution with specific cross-sectional areas and flow directing elements to ensure even distribution across multiple anodes, reducing ohmic resistance and shunt currents, thereby maintaining consistent reaction rates and energy production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant flow of aqueous alkaline solution is used to remove Al(OH)3 from the anode surface, then the anode surface is kept clean and reaction rate is maintained, but the reaction rate of electricity production decreases and efficiency is reduced
Solution Approach 1:
The patent applies local quality by providing different flow conditions to different regions of the anode. Flow directing elements create localized flow patterns that ensure adequate Al(OH)3 removal at critical areas while minimizing excessive flow in other regions, thus balancing surface cleanliness with electricity production efficiency
Solution Approach 2:
The patent uses dynamics by making the flow distribution adaptive rather than uniform. Flow directing elements dynamically adjust the electrolyte flow based on local requirements, allowing the system to optimize between removing coating products and maintaining high reaction rates at different locations on the anode surface
2Quantity of substance
If multiple anodes with large surface area are used to increase capacity, then the energy storage increases, but the constant flow of electrolyte affects the reaction rate and electricity production efficiency
Solution Approach 1:
The patent applies segmentation by dividing the electrolyte flow into multiple independent streams that can be distributed to multiple anodes. Flow directing elements create separate flow paths for each anode, allowing each to operate optimally without being constrained by the need for uniform constant flow across all anodes, thus maintaining high efficiency while supporting large total capacity
Solution Approach 2:
The patent ensures that each anode receives customized flow conditions appropriate to its specific requirements. By using flow directing elements, the system provides local quality control over electrolyte distribution, allowing multiple anodes of large surface area to maintain high reaction rates without excessive electrolyte flow affecting overall efficiency
3Reliability
If electrolyte flow is increased to remove Al(OH)3 coating, then the anode surface is maintained, but voltage drops between cells increase and energy is lost to shunt currents
Solution Approach 1:
The patent reduces energy loss by applying flow only where needed. Flow directing elements create localized flow patterns that maintain anode surfaces without subjecting the entire electrolyte system to high flow rates, thus minimizing voltage drops and reducing energy lost to shunt currents while still effectively removing Al(OH)3 coating
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
This approach enhances the energetic efficiency of aluminum-air batteries by maintaining consistent reaction rates, reducing voltage drops between cells, and evenly consuming anodes, resulting in higher specific energy and reduced energy losses from shunt currents.
Implementation Method 1
Al(OH)3 + KOH →K+ + Al(OH)-4. The salt K+ + Al(OH)-4 dissolves in water. This reaction allows removal of the Al(OH)3 from the surface of the anode
Implementation Method 2
The design includes a structured flow of alkaline aqueous electrolyte solution with specific cross-sectional areas and flow directing elements to ensure even distribution across multiple anodes, reducing ohmic resistance and shunt currents
Implementation Method 3
Aluminum reacts with oxygen and water to produce aluminum-hydroxide according to the following reaction: 4Al + 6H2O + 3O2 → 4Al(OH)3 + 2.71v
Implementation Method 4
Electricity production by metal-air batteries is based on the oxidation of metals, usually aluminum, in the presence of air (O2) and water
Implementation Method 5
Some of the aluminum may react with the water to produce aluminum-hydroxide and hydrogen according to the following reaction: 2Al + 6H2O → 2Al(OH)3 + 3H2
Data Source
Figure 1A~2
Figure 3
Figure 4
AI summary
Flow directing element in a metal air cell is configured to cause evenly distributed flow of aqueous electrolyte solution electrolyte in it over the anode. Flow distributing element in a metal air cell is configured to lengthen the path of electrolyte flow from an inlet to the anode, thereby to increase ohmic resistance to shunt currents in the cell. A battery with these cells consumes the metal in the metal anodes evenly and with minimized shunt currents.