Battery Gas Venting Path for Stable High-Flow Discharge
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Solution Overview
Problem
Conventional gas venting devices for battery packs face limitations in discharging large amounts of gas efficiently, leading to choking phenomena and shock wave generation, which compromises safety and flow stability.
Innovation Solution
A gas venting device with a hollow bracket member and a venting disk that includes a first flow path with a decreasing cross-sectional area and a second flow path with an increasing cross-sectional area, where the venting disk is installed on the outlet side, preventing contamination and maximizing gas flow stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical-shaped gas discharge flow path is used, then the device is easy to design, but the pressure between inlet and outlet is not large, limiting the flow amount of gas that can be discharged
Solution Approach 1:
The gas discharge flow path is segmented into multiple sections with different cross-sectional area characteristics. The first flow path has a cross-sectional area that decreases along the discharge direction, while the second flow path has a cross-sectional area that increases along the discharge direction. This segmentation allows the path to optimize pressure buildup in the first section and flow expansion in the second section, thereby increasing the overall gas discharge flow amount while maintaining design feasibility.
2Stability of the object's composition
If a venting disk with low rupture pressure is selected to avoid choking phenomenon, then the flow stability is improved, but it is difficult to ensure component reliability of the venting disk
Solution Approach 1:
The flow path is preliminarily designed with specific cross-sectional area variations before the gas discharge process begins. The first flow path section is configured to decrease in cross-sectional area, creating a converging effect that accelerates gas flow and prevents choking phenomenon before it occurs. This preliminary structural arrangement allows the system to maintain flow stability without requiring the venting disk to rupture at abnormally low pressures, thus preserving component reliability.
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 gas discharge efficiency, increases rupture pressure, and prevents shock wave generation, ensuring safer and more stable gas discharge from battery modules and packs.
Implementation Method 1
configured to rupture when a predetermined pressure is applied to the venting disk
Data Source
AI summary
Disclosed herein is a gas venting device, and a battery module and a battery pack including the same. A cross-sectional area of a flow path according to the gas discharge direction of the gas venting device can be increased or decreased to allow a larger flow rate of gas to be discharged with a venting disk of the same area. The venting disk can be installed on an outlet side of the gas discharge flow path to protect internal components, and the like.