Battery Stack Cover Venting Path for Fragment-Safe Gas Discharge
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Solution Overview
Problem
Existing power supply devices face challenges in efficiently discharging high-pressure gas from secondary battery cells while preventing fragments and contents from escaping, leading to increased internal pressure and temperature rises, particularly in compact designs.
Innovation Solution
The power supply device incorporates a gas guide path with horizontal and vertical bending portions to redirect gas flow, effectively damming solids and liquids, and utilizing a three-dimensional path structure to maintain a larger sectional area, reducing pressure and temperature rises, and includes a metal bus bar system for heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas duct with a small exhaust port is used to prevent fragments and contents from flowing out, then safety is improved by containing fragments, but discharge efficiency deteriorates causing increased internal pressure and temperature rise
Solution Approach 1:
The gas duct is segmented into multiple exhaust ports instead of a single small port. This segmentation allows the system to maintain safety by having multiple controlled discharge points while improving overall discharge efficiency through increased total exhaust area, resolving the contradiction between fragment containment and gas discharge performance
Solution Approach 2:
The invention transitions from a two-dimensional view of a single exhaust port to a three-dimensional arrangement of multiple exhaust ports distributed across different locations and orientations. This dimensional change enables simultaneous fragment containment through strategic port placement and improved discharge efficiency through increased exhaust capacity
2Reliability
If the gas duct sectional area is reduced to contain fragments, then fragment containment is improved, but internal pressure increase and temperature rise worsen
Solution Approach 1:
The gas duct cross-section is segmented into multiple exhaust ports distributed across the duct surface. This segmentation allows the duct to maintain a larger overall sectional area for efficient gas discharge while still containing fragments through the strategic positioning and sizing of individual ports, resolving the contradiction between fragment containment and temperature control
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 design enhances safety by preventing the escape of fragments and liquids, reducing internal pressure and temperature of discharged gas, and effectively utilizing limited space, thereby improving the safety and efficiency of gas discharge.
Implementation Method 1
one or more horizontal gas flow bending portions that bend at least a flow direction of some of the gas in plan view of the cover part
Data Source
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AI summary
Provided is power supply device (100) configured for safe discharge to the outside of the power supply device even when gas at high temperature and under high pressure is discharged from a secondary battery cell, power supply device (100) including: a plurality of secondary battery cells (1) each having gas discharge valve (15) for discharging internal gas; and cover part (50) disposed on one surface of battery stack (2) with the plurality of secondary battery cells (1) stacked while covering gas discharge valve (15) of each of the plurality of secondary battery cells (1). Cover part (50) is provided inside with a gas guide path partitioned to discharge gas discharged from gas discharge valve (15) to the outside of cover part (50), and the gas guide path includes one or more horizontal gas flow bending portions that bend at least a flow direction of some of the gas in plan view of cover part (50).