Battery Enclosure Check Valve for Gas and Debris Venting
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Solution Overview
Problem
Existing power supply devices with multiple battery cells face challenges in efficiently discharging high-temperature and high-pressure gas and foreign matters while preventing external oxygen ingress, leading to potential case deformation, ignition, and increased internal pressure.
Innovation Solution
Incorporation of a check valve in the outer case that opens to discharge gas and foreign matters when internal pressure rises and closes when pressure decreases, combined with a simple closing mechanism like a plate spring to prevent external air entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If through-holes of the perforated plate are used to discharge gas, then cooling and suppression of ignition is achieved, but foreign matters clog the through-holes reducing discharge capability
Solution Approach 1:
The discharge function is segmented into two independent paths: the perforated plate handles gas discharge and cooling, while the check valve handles foreign matter discharge. This segmentation allows each component to specialize in its function without interference, preventing foreign matters from clogging the gas discharge path while maintaining effective cooling and suppression capabilities.
Solution Approach 2:
The check valve acts as an intermediary component that specifically handles foreign matters before they can reach and clog the perforated plate. By introducing this intermediate discharge path, the system protects the perforated plate's through-holes from contamination while maintaining overall discharge effectiveness.
2Reliability
If a large hole is opened in the outer case for discharge, then foreign matters can be discharged effectively, but oxygen enters the case causing potential ignition
Solution Approach 1:
The check valve employs a dynamic opening/closing mechanism that responds to pressure differential. During normal operation, it remains closed to prevent oxygen ingress. During abnormal high-pressure events, it automatically opens to discharge foreign matters. This dynamic behavior allows the system to maintain safety under normal conditions while providing effective discharge capability when needed.
Solution Approach 2:
The discharge system uses local quality differentiation by providing two distinct discharge paths with different characteristics: the perforated plate provides numerous small holes optimized for gas flow and cooling, while the check valve provides a larger opening optimized for foreign matter discharge. Each location is optimized for its specific function, allowing effective foreign matter discharge without compromising ignition suppression.
3Quantity of substance
If multiple battery cells are used to increase capacity, then power supply capability is improved, but the amount of discharged gas and foreign matters increases overwhelming the exhaust capability
Solution Approach 1:
The system merges two discharge mechanisms (perforated plate and check valve) into a unified exhaust system. The perforated plate handles the continuous discharge of gas from multiple battery cells, while the check valve handles the intermittent discharge of foreign matters. This combination allows the system to scale with battery capacity while maintaining adequate exhaust capability for both gas and foreign matters.
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
Effectively discharges high-temperature and high-pressure gas and foreign matters, preventing ignition and maintaining safe internal pressure by ensuring one-way discharge and preventing external air ingress.
Implementation Method 1
a check valve configured to open when an internal pressure increases and to close when the internal pressure decreases
Implementation Method 2
a simple closing mechanism like a plate spring to prevent external air entry
Data Source
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AI summary
A power supply device in accordance with an aspect of the present disclosure includes: secondary battery cells, each of the secondary battery cells including a discharge valve configured to open when an internal pressure exceeds a predetermined pressure; and an outer case accommodating the secondary battery cells therein. The outer case includes a check valve configured to open when an internal pressure of the outer case increases and to close when the internal pressure of the outer case decreases. The check valve includes: a discharge window opening in a part of the outer case; and a closing mechanism which is openable and closable and is configured to close the discharge window.