Battery Gas Venting Path With Tapered Flow for Higher Discharge
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Solution Overview
Problem
Conventional gas venting devices for battery packs have limitations in discharge flow rate due to their simple cylindrical structure, which restricts the amount of gas that can be expelled, posing safety risks.
Innovation Solution
A gas venting device with a bracket and venting disk that includes a through hole with a discharge flow path having a continuously or gradually reduced cross-sectional area, utilizing a discharge guide member with a truncated conical shape to enhance the pressure difference between the inlet and outlet, allowing for a larger gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a simple cylindrical structure with constant cross-sectional area is used for the gas discharge flow path, then the device complexity is reduced and ease of manufacture is improved, but the discharge flow rate is limited due to insufficient pressure difference between inlet and outlet
Solution Approach 1:
The cross-sectional area of the gas discharge flow path is changed along the flow direction, transitioning from a constant area cylindrical structure to a variable area structure where the area decreases from inlet to outlet. This parameter change creates a pressure gradient that increases the discharge flow rate while maintaining manufacturing feasibility through standard machining processes.
2Productivity
If a venting disk with a given area is used, then the device simplicity is maintained, but the discharge flow amount per hour is limited
Solution Approach 1:
The flow path cross-sectional area parameter is varied along the flow direction to optimize gas discharge efficiency. By creating a tapered or conical flow path with decreasing area from inlet to outlet, the pressure differential is increased, enabling higher gas flow rates through the same venting disk area, thus improving productivity without increasing the venting disk size.
3Productivity
If a truncated conical shape with continuously reduced cross-sectional area is implemented, then the pressure difference between inlet and outlet is increased improving discharge efficiency, but the manufacturing precision requirements are increased
Solution Approach 1:
The flow path is designed with a controlled gradual area reduction rather than an abrupt change. The truncated conical shape provides a smooth transition that can be manufactured using standard taper turning or conical machining operations, balancing the need for increased pressure differential with achievable manufacturing precision levels.
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 design enables a higher discharge flow rate of gas per hour, improving the safety of battery modules and packs by effectively releasing pressure and preventing potential explosions.
Implementation Method 1
a venting disk which is fastened to the bracket while in contact with one surface of the bracket to shield the through hole and is configured to rupture when a predetermined pressure is applied
Implementation Method 2
a cross-sectional area of the gas discharge flow path is continuously or gradually reduced in a gas discharge direction
Implementation Method 3
a gas discharge flow path is formed in the through hole formed in the bracket, and a cross-sectional area of the gas discharge flow path is continuously or gradually reduced in a gas discharge direction
Data Source
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AI summary
The present technology relates to a gas venting device, and a battery module and a battery pack including the same. A cross-sectional area of a flow path is continuously reduced in a gas discharge direction, and thus a larger amount of gas is allowed to be discharged even when a venting disk having the same area is used.