Pressure Relief Channel Gas Sensing for Battery Thermal Runaway
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Solution Overview
Problem
Existing power battery systems face challenges in timely and accurate warning of thermal runaway events, which can lead to safety risks for users.
Innovation Solution
A thermal runaway early warning method that involves acquiring the target gas content in the pressure relief channel, determining if a thermal runaway event has occurred based on this content, and outputting a warning signal when the event is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional monitoring methods are used in power battery systems, then the system structure remains simple, but the ability to detect and warn thermal runaway events timely is insufficient
Solution Approach 1:
The patent introduces a pressure relief channel as an intermediary component that connects the battery cell interior to the external environment. This channel allows gas produced during thermal runaway to escape in a controlled manner, enabling external detection without requiring direct penetration into the battery cell structure. The pressure relief channel thus serves as a mediator that bridges the internal battery state and external monitoring systems.
Solution Approach 2:
The patent replaces traditional mechanical or electrical monitoring methods with a gas-based detection system. Instead of using complex temperature sensors, pressure sensors, or electrical monitoring systems inside the battery, the invention uses gas content analysis in the pressure relief channel to infer thermal runaway conditions. This substitution simplifies the monitoring system while improving reliability.
2Measurement precision
If gas content detection is implemented in the pressure relief channel, then thermal runaway warning accuracy improves, but the device complexity increases
Solution Approach 1:
The patent extracts the detection function from the battery cell interior and relocates it to the pressure relief channel. By taking out the gas sampling function and placing it in the external pressure relief channel, the system can detect thermal runaway gases without inserting sensors into the battery cell itself. This extraction approach improves measurement precision while minimizing the intrusion into the battery structure.
Solution Approach 2:
The patent creates a copy of the battery's internal gas environment in the pressure relief channel. The gas composition in the pressure relief channel mirrors the internal battery conditions, allowing external detection systems to analyze a representative sample without direct contact with the battery cell. This copying approach enables accurate thermal runaway detection with minimal added complexity.
3Loss of time
If early warning system is activated, then user safety response time increases, but false alarms may cause unnecessary panic
Solution Approach 1:
The patent establishes a pressure relief channel in advance before any thermal runaway event occurs. This preliminary structural preparation ensures that when thermal runaway does occur, gases can immediately escape into the detection system without delay, enabling rapid warning. The preliminary action of creating the pressure relief pathway eliminates response time delays while the gas content threshold detection prevents false alarms.
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 method enables rapid and accurate warning of thermal runaway events, enhancing user safety by allowing timely evacuation and preventing potential hazards.
Implementation Method 1
The pressure relief channel is used for pressure relief protection of the battery cells
Data Source
Figure 1~3
AI summary
The present application provides a thermal runaway warning method, an electronic device, and a storage medium in a power battery system. The power battery system (35) includes a plurality of battery cells and a pressure relief channel. The pressure relief channel is used for pressure relief protection of the battery cells. The thermal runaway warning method includes: acquiring a target gas content in the pressure relief channel; determining whether a thermal runaway event is occurred based on the target gas content; and outputting a thermal runaway warning signal, when the thermal runaway event is determined occurring.