Molten Fluid Electrode Apparatus for Thermal Battery Safety
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Solution Overview
Problem
Thermal batteries face safety issues due to the risk of fire and explosion from the mixing of molten active materials, which has constrained their widespread adoption despite their advantages of low cost and high energy density, as existing designs fail to adequately prevent thermal runaway events.
Innovation Solution
The solution involves limiting the amount of fluid electrode material in thermal batteries by heating only selected portions of the electrode materials to maintain them in a fluid state, thereby minimizing the potential for fire during structural failures and reducing the thermal energy released in case of a breach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If all electrode materials are heated to fluid state to maximize energy density, then the energy density is improved, but the safety risk increases due to potential fire and explosion from mixing molten materials
Solution Approach 1:
The electrode materials are divided into multiple separate containers instead of being in a single large container. Each container holds a portion of the fluid electrode material, and only the required amount is heated to fluid state. This segmentation limits the quantity of molten material present at any time, reducing the potential harm from mixing while maintaining high energy density through efficient space utilization of the divided containers.
Solution Approach 2:
Instead of heating all electrode materials to fluid state simultaneously, only selected portions are heated as needed. The system heats electrode materials partially and sequentially, maintaining fluid state only for the amount required at that moment. This partial action approach minimizes the volume of molten material present, reducing safety risks while still achieving high energy density through controlled, on-demand heating.
2Quantity of substance
If large amounts of fluid electrode material are used to increase capacity, then the energy storage capacity is improved, but the thermal runaway risk increases upon structural failure
Solution Approach 1:
The total electrode material capacity is distributed across multiple separate containers rather than concentrated in one large volume. Each container holds a fraction of the total capacity, so that upon structural failure, only a small portion of material can escape and react. The segmentation ensures that even if one container fails, the thermal runaway is limited to that segment, protecting the overall system safety while maintaining total capacity.
Solution Approach 2:
The system maintains only the necessary amount of fluid electrode material in each container at any given time, rather than keeping all material in fluid state. By controlling the heating to maintain fluid state only for the required capacity in each segmented container, the system reduces the potential thermal energy release from any single failure event while preserving the total energy storage capacity across all containers.
3Productivity
If high temperature is maintained throughout the battery to keep electrodes fluid, then the electrochemical performance is improved, but the safety hazards increase
Solution Approach 1:
Different regions of the battery system are maintained at different temperatures. The electrode materials in active use are heated to high temperatures to maintain fluid state and ensure good electrochemical performance, while other regions containing electrode materials are kept at lower temperatures. This local quality differentiation allows high productivity where needed while minimizing fire hazards in inactive regions through reduced temperature maintenance.
Solution Approach 2:
High temperature is applied only to the portions of electrode materials that are currently needed for electrochemical reactions, rather than maintaining high temperature throughout the entire battery. By selectively heating only the necessary portions to fluid state and maintaining lower temperatures elsewhere, the system achieves high electrochemical performance during operation while reducing overall fire hazards through localized temperature 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
This approach minimizes the risk of fire and explosion by limiting the amount of fluid material present, allowing for safer operation and maintaining the high energy density of thermal batteries, making them viable for applications like electric vehicles.
Implementation Method 1
a heating system, configured to heat selected portions of the electrode materials to place and maintain the selected portions in the fluid state
Implementation Method 2
The plurality of negative electrode reservoirs are connected to the negative electrode region such that the negative electrode material contained in the reservoirs can flow between the reservoir and the negative electrode region
Data Source
AI summary
A battery includes negative electrode material and positive electrode material where the materials are in a solid phase except for selected portions that are heated to transform the selected portions into a fluid. The fluid portion of negative electrode material is directed to a negative electrode region of a reaction chamber and the fluid portion of positive electrode material is directed to a positive electrode region of the reaction chamber where a solid electrolyte containing ions of the negative electrode separates the positive electrode region from the negative electrode region.