Battery Pack Gas Venting with Tapered Flow Path Pressure Boost
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Solution Overview
Problem
Existing gas venting devices for battery packs have limitations in discharging gas at a high flow rate due to their cylindrical structure, which restricts the pressure difference between the inlet and outlet, thereby limiting the efficiency of gas venting.
Innovation Solution
A gas venting device with an inner and outer bracket system, where the cross-sectional area of the flow path continuously decreases from the inlet to the outlet, and a venting disk that breaks under predetermined pressure to enhance gas discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cylindrical structure with simple inlet-outlet connection is used, then the device structure is simple, but the pressure difference between inlet and outlet is not large, limiting gas discharge flow rate
Solution Approach 1:
The flow path in the outer bracket is designed with a curved, tapered geometry rather than a straight cylindrical connection. This curvature creates a pressure gradient that enhances gas flow rate while maintaining structural simplicity.
Solution Approach 2:
The cross-sectional area of the flow path is varied along its length, transitioning from a larger area at the inlet to a smaller area at the outlet. This parameter change creates the necessary pressure difference to increase gas discharge flow rate.
2Productivity
If the cross-sectional area of the flow path is decreased from inlet to outlet, then gas flow rate is improved, but manufacturing precision requirements increase
Solution Approach 1:
The tapered curved flow path is formed as an integrated feature of the outer bracket, allowing the complex geometry to be manufactured in a single operation rather than requiring multiple precision assemblies.
Solution Approach 2:
The flow path is merged with the outer bracket structure itself, eliminating the need for separate precision-machined flow path components and reducing overall manufacturing complexity.
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 device achieves a higher gas flow rate even with a venting disk of the same area, improving the safety of battery modules and packs by effectively managing internal pressure and facilitating quick gas discharge.
Implementation Method 1
a venting disk configured to shield the first through hole and the second through hole by allowing the inner bracket to be coupled to the outer bracket and to be broken when a predetermined pressure is applied
Implementation Method 2
a cross-sectional area of a flow path formed at the outer bracket continuously or sequentially is configured to decrease from an inlet portion of the flow path to an outlet portion of the flow path in a gas discharge direction
Data Source
AI summary
A gas venting device, and a battery module and a battery pack comprising same has a gradually reducing the cross-sectional area of a flow path in a gas discharge direction to create so that a greater flow rate of gas can be discharged even when a venting disc having the same area is used.