Battery Discharge Line Closure for Gas Venting
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Solution Overview
Problem
Battery systems, particularly lithium-ion systems, face safety risks due to undesired blocking of discharge lines by objects, which can impede the discharge of gases and increase the risk of accidents.
Innovation Solution
A uni-directional, self-closing closure is integrated at the boundary between the interior and exterior of the discharge line, which opens automatically when a pressure threshold is reached, using a component within the battery system to ensure controlled degassing and protection against external substances, employing a non-return valve or plunger with an annular sealing lip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discharge line is provided for discharging gases from the battery system, then the battery system can release produced substances, but the discharge line is vulnerable to blocking by external objects
Solution Approach 1:
A closure (non-return valve or plunger with sealing lip) is introduced as an intermediary component in the discharge line. This closure acts as a mediator that selectively allows gas discharge while blocking external objects from penetrating into the battery system, thus resolving the contradiction between maintaining discharge functionality and preventing harmful blockages
Solution Approach 2:
The closure is designed to open automatically when the internal pressure exceeds a threshold value, enabling the discharge line to self-regulate without external intervention. The closure opens to allow gas discharge and automatically closes when pressure normalizes, providing self-service functionality that enhances safety while maintaining operational reliability
2Productivity
If the discharge line remains open for gas discharge, then substances can be released, but external substances can penetrate into the battery system
Solution Approach 1:
The closure with sealing lip serves as an intermediary that separates the internal battery environment from the external discharge line. It maintains a sealed barrier that prevents external substance penetration while allowing controlled gas discharge through its opening mechanism
Solution Approach 2:
The closure transitions from a static sealed state to a dynamic opening state based on pressure conditions. It remains closed during normal operation to prevent penetration, and opens dynamically when pressure exceeds the threshold to enable gas discharge, thus adapting to different operational requirements
3Reliability
If a closure is installed in the discharge line, then protection against blocking is improved, but the closure may not open automatically at the right pressure threshold
Solution Approach 1:
The closure incorporates a spring mechanism that provides self-service functionality. The spring is pre-loaded to create a closing force that balances against internal pressure, enabling the closure to automatically open when pressure exceeds the threshold and automatically close when pressure returns to normal, without requiring external control systems
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 solution enhances safety by preventing blockages and ensuring controlled discharge of gases, reducing the risk of accidents and maintaining a sealed environment, while allowing for pressure-dependent opening based on the battery system's physical properties.
Implementation Method 1
the closure which can be opened uni-directionally and is self-closing is opened when a threshold value of the pressure which prevails in the discharge line is reached or exceeded
Implementation Method 2
The use of a plunger with an annular sealing lip leads to the advantageous factor of protecting the discharge line against gases which penetrate from the outside
Data Source
AI summary
A battery system, in particular a lithium-ion battery system, comprising a discharge line (AL) with an opening for discharging substances which are produced in the battery system, in particular gases, to the surroundings of the battery system.