Battery Pack Gas Venting Path for Higher Discharge Flow
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Solution Overview
Problem
Existing gas venting devices for battery packs have limitations in discharging gas at a higher flow rate due to their cylindrical structure, which restricts the pressure difference between the inlet and outlet, thereby limiting the efficiency of gas discharge.
Innovation Solution
A gas venting device with an inner and outer bracket, and a venting disk that shields the through holes and breaks when a predetermined pressure is applied, featuring a flow path with a cross-sectional area that continuously decreases from the inlet to the outlet, enhancing gas discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cylindrical venting device with simple inlet-outlet connection is used, then the device structure is simple, but the pressure difference between inlet and outlet is small, limiting gas discharge flow rate
Solution Approach 1:
The venting device is divided into multiple components: an inner bracket with a first through hole, an outer bracket with a second through hole, and a venting disk. This segmentation allows the creation of a more complex flow path structure that increases pressure difference and discharge flow rate, while maintaining modular assembly and disassembly capabilities.
Solution Approach 2:
The invention transitions from a simple cylindrical structure to a multi-dimensional configuration by adding the venting disk that can rotate or break, and by creating a flow path that moves from the first through hole through the venting disk to the second through hole. This dimensional change enables greater pressure difference and improved gas discharge efficiency.
2Productivity
If the venting disk area is increased to improve gas discharge flow rate, then more gas can be discharged, but the device size and complexity increase
Solution Approach 1:
The invention changes the flow path parameters by creating a conical or tapered passage between the first and second through holes, rather than using a simple cylindrical connection. This parameter change increases the pressure difference across the venting disk, enabling higher discharge flow rates with the same disk area.
Solution Approach 2:
The venting disk is designed to break or rapidly open under pressure, allowing gas to rush through the flow path quickly. This skipping mechanism enables high flow rates without requiring a large disk area, as the rapid opening creates a effective discharge pathway that maximizes gas ejection speed.
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 improves the safety of battery modules and packs by enabling higher flow rates of gas discharge even with a venting disk of the same area, effectively managing internal pressure and preventing explosions or gas leakage into vehicles.
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 including same has a gradually reducing cross-sectional area of a flow path in a gas discharge direction so that a greater flow rate of gas can be discharged even when a venting disc having the same area is used.