Battery Pack Housing Gas Sampling for Post-Crash Fault Detection
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Solution Overview
Problem
Existing battery packs face challenges in determining the safety status, especially after crash events or environmental damage, where internal diagnostics fail, and faults like cell rupture or leaks cannot be reliably detected.
Innovation Solution
A method involving an air inlet and outlet port system with removable sealing plugs, allowing a controlled airflow through the battery pack housing for analysis using a gas analyzer to detect gases like H2, CO2, CO, NOx, O2, O3, and hydrocarbons, which indicates the health status of the battery pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal diagnostics are used to detect battery faults, then the system can monitor battery status during normal operation, but it fails to detect faults after crash events or environmental damage
Solution Approach 1:
The patent introduces a gas analyzer as an intermediary detection device that analyzes the gaseous mixture inside the battery housing. This mediator can detect faults (such as cell rupture releasing hydrocarbons) that internal diagnostics cannot detect after crash events, thereby improving detection reliability across all operational conditions including extraordinary scenarios.
Solution Approach 2:
The patent replaces the electronic internal diagnostics system with a chemical analysis approach using a gas analyzer. Instead of relying on electrical signals and sensors that may fail after crashes, the system uses gas composition analysis (detecting hydrocarbons, hydrogen, oxygen) to determine battery safety status, making the detection system more versatile across different operational conditions.
2Reliability
If the battery housing is completely sealed, then the battery is protected from environmental damage, but gases produced inside cannot be analyzed to assess battery health
Solution Approach 1:
The patent segments the battery housing system by introducing a removable sampling port that separates the sealed battery environment from the external analysis device. The housing remains sealed during normal operation to protect against environmental damage, but the sampling port can be opened to extract a gas sample for analysis, thus preserving both protection capability and information access.
Solution Approach 2:
The patent implements preliminary action by equipping the battery housing with a pre-designed sampling port and sealing mechanism that maintains the sealed state during operation. When health assessment is needed, the sampling port can be quickly opened to extract gas samples without compromising the overall sealed structure, allowing both protection and information retrieval.
3Reliability
If a gas sampling system is implemented, then battery health can be assessed after crashes, but the system complexity and cost increase
Solution Approach 1:
The patent extracts only the essential function needed for post-crash detection: a simple gas sampling port and connection to a portable gas analyzer. Rather than implementing a complex integrated system, the solution takes out the minimum necessary components (sampling port, sealing mechanism) to enable gas extraction and analysis, thereby achieving post-crash detection capability without excessive complexity.
Solution Approach 2:
The patent employs a simple, inexpensive sampling port design that can be easily opened and closed, and uses portable gas analyzers that are relatively low-cost compared to comprehensive monitoring systems. This approach provides affordable post-crash detection capability without requiring complex, expensive infrastructure.
4Loss of information
If multiple gas sensors are installed inside the battery housing, then real-time gas monitoring is achieved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
Instead of installing multiple complex gas sensors inside the battery housing, the patent uses a simple sampling port as an intermediary to extract gas samples for external analysis. This mediator approach provides gas composition information without requiring complex internal sensing systems, maintaining manufacturing simplicity while still achieving detection capability.
Solution Approach 2:
The patent replaces the electronic sensing system (multiple gas sensors) with a mechanical sampling approach. Instead of using electronic devices to detect gas composition in real-time, the system uses a simple mechanical sampling port to extract gas samples that can be analyzed externally, thereby avoiding the complexity and cost of installing multiple sensors while maintaining ease of manufacture.
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
Enables the determination of the battery pack's health status even in extraordinary conditions, such as post-crash scenarios, by analyzing the gaseous mixture within the pack, providing a simple and cost-effective means to assess safety and detect potential hazards like H2 gas release.
Implementation Method 1
analyzing the air stream leaving the air outlet port with a gas analyzer... detect gases like H2, CO2, CO, NOx, O3, and hydrocarbons
Data Source
Figure 1~2
AI summary
The present invention relates to a method for determining the composition of a gaseous mixture enclosed within a gas-tight housing of a battery pack and a corresponding gas-tight housing. The method comprises the steps of: a) removing the sealing means from the air inlet port and from the air outlet port; b) generating an air stream entering the housing through the air inlet port and leaving the housing at the air outlet port; and c) analyzing the air stream leaving the air outlet port with a gas analyzer.