Convection Battery Cell with Dendrite-Stopping Electrolyte Flow
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Solution Overview
Problem
Lithium-ion batteries face limitations in size and power due to mass and heat transfer issues, and dendrite formation at the lithium metal anode, which leads to short circuits and reduces energy density.
Innovation Solution
A convection battery system with dendrite-stopping chambers and reverse flow operations, utilizing a pump to enhance ion transport and electrode design with microfibrous media to minimize flow resistance and prevent dendrite growth, allowing for larger cell size and power storage while reducing the number of cells needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal anode is used to increase energy density, then energy density improves, but dendrite formation occurs causing short circuits
Solution Approach 1:
A dendrite-stopping chamber filled with bare-metal fibrous media is introduced as an intermediary component between the lithium metal anode and cathode. This chamber acts as a physical barrier that intercepts and stops dendrites before they can reach the cathode and cause short circuits, while allowing lithium ion transport to continue
Solution Approach 2:
The dendrite-stopping chamber utilizes bare-metal fibrous media with a porous structure that allows lithium ions to pass through while physically blocking dendrite growth. The porous nature of the fibrous media enables ion transport while the metallic fibers provide mechanical obstruction to dendrite penetration
2Reliability
If carbon graphite anode is used to prevent dendrite formation, then reliability improves, but energy density decreases to 1/10 of lithium metal battery
Solution Approach 1:
The battery system is segmented into distinct functional zones: a lithium metal anode chamber for high energy density, a dendrite-stopping chamber for safety, and a cathode chamber. This segmentation allows each component to optimize its specific function rather than compromising overall performance
3Quantity of substance
If thick battery design is used to increase power storage, then capacity improves, but mass and heat transfer limitations occur
Solution Approach 1:
A pump-driven convection system is implemented to force electrolyte flow through the battery cells. This hydraulic approach replaces passive diffusion with active convective transport, dramatically increasing the speed of lithium ion movement and heat removal throughout the battery system
Solution Approach 2:
The battery design transitions from a static, planar electrode arrangement to a three-dimensional flow-based architecture with multiple chambers and flow paths. This dimensional change enables simultaneous ion transport and heat removal throughout the entire battery volume
4Productivity
If pump-driven convection flow is implemented to increase ion transport speed, then productivity improves, but device complexity increases
Solution Approach 1:
The pump-driven convection system serves multiple functions simultaneously: it transports lithium ions between electrodes, removes heat from the battery, and maintains electrolyte circulation through the dendrite-stopping chambers. This multi-functionality reduces the need for separate systems for each function
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 system significantly reduces flow resistance, increases energy density, and prevents dendrite formation, enabling larger individual battery cells and fewer cells in electric vehicles or power storage units, enhancing electrical performance and safety.
Implementation Method 1
By utilizing a pump to push liquid through electrodes, three advantages could be achieved: the first is that ion transport becomes faster
Implementation Method 2
each of the chambers has a diode connected thereto. The diode is arranged to allow electrons to exit the dendrite-stopping chamber
Implementation Method 3
The dendrite-stopping chambers preferably have a bare-metal fibrous media therein
Implementation Method 4
electrons move from the first anode toward the first cathode, and electrolyte fluid is pumped and flows in a first direction, such that lithium ions move from the second anode to the first cathode
Data Source
AI summary
Disclosed is a convection battery system process for large power storage units or electrical vehicles that allows easy electrolyte flow through electrodes and other components by novel designs of a separator, an anode and a cathode. Utilization of dendrite-stopping chambers and reverse electrolyte flow minimize dendrite formation in metal anodes. The system and process allow significant increase of size and power output of an individual battery electrode, minimizing the total number of electrodes required in a power system, and increasing overall performances of a battery pack with hundreds of electrodes.