Electrochemical Cell Vent with Anti-Deployment Projection
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Solution Overview
Problem
Lithium-ion batteries used in electric vehicles face challenges such as temperature variations and unique manufacturing issues, requiring improved battery modules that address design and engineering differences compared to nickel-metal-hydride batteries, while also enhancing performance, range, and reducing costs.
Innovation Solution
The development of an electrochemical cell with a housing featuring a vent mechanism that deploys to expel gases, including a projection to prevent accidental deployment, which acts as both a safety device and a current disconnect, addressing temperature regulation and manufacturing complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent mechanism is added to the housing to expel gases, then safety is improved, but device complexity increases
Solution Approach 1:
The vent mechanism is segmented into distinct functional components: a vent cover, a deployment mechanism with fracture lines, and a projection element. This segmentation allows each component to perform its specific function independently while simplifying the overall design and manufacturing process.
Solution Approach 2:
The vent mechanism is designed to deploy automatically through a self-service mechanism where internal pressure causes the housing to fracture along predetermined lines, opening the vent without requiring external activation or complex control systems.
2Reliability
If a projection is added to prevent accidental vent deployment, then reliability is improved, but device complexity increases
Solution Approach 1:
The projection extends outward from the housing to preemptively prevent accidental deployment by physically blocking external objects from applying sufficient force to initiate vent deployment, thereby counteracting potential harmful actions before they can occur.
Solution Approach 2:
The projection is merged with the existing housing structure rather than being a separate component, integrating the protective function into the existing design and minimizing additional complexity.
3Quantity of substance
If lithium-ion batteries are used instead of nickel-metal-hydride batteries, then charge density and specific power are improved, but temperature sensitivity increases
Solution Approach 1:
The vent mechanism converts the harmful effect of temperature-induced pressure buildup into a beneficial safety feature by automatically deploying to release excess pressure when temperature variations cause internal pressure to increase, thereby protecting the battery system.
4Adaptability or versatility
If a deployable vent is designed into the housing, then gas expulsion capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The housing is designed with predetermined fracture lines and weakened areas that guide the deployment process, allowing the vent to open reliably without requiring high-precision manufacturing. The preliminary structuring of the housing ensures consistent performance across production batches.
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 enhances the safety and performance of lithium-ion batteries by effectively managing pressure and preventing accidental venting, improving the reliability and efficiency of electric vehicle battery systems.
Implementation Method 1
a vent located at the first end that is configured to deploy from the housing to allow the expulsion of gases from within the cell
Data Source
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AI summary
An electrochemical cell includes a housing having a first end and a vent located at the first end that is configured to deploy from the housing to allow the expulsion of gases from within the cell. The electrochemical cell also includes at least one projection extending outward from the first end adjacent the vent. The at least one projection is configured to prevent accidental deployment of the vent.