Battery Pack Fuse Housing Venting for Blowout Pressure Relief
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Solution Overview
Problem
Existing protecting devices for lithium-ion secondary batteries face challenges in handling large current applications, as they may experience thermal shock and pressure issues during meltable conductor blowout, potentially leading to device damage and contamination due to vaporized material escaping through inappropriate openings.
Innovation Solution
The protecting device incorporates a meltable conductor with increased cross-sectional area and heat-generators connected to an insulating substrate, featuring strategically placed openings in the housing to release expanding air and trap vaporized material on external connection terminals, preventing damage and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cross-sectional area of the meltable conductor is increased to handle large current, then the current capacity is improved, but the thermal shock and pressure during blowout increase causing device damage
Solution Approach 1:
The patent extracts the harmful vaporized material and expanding air from the housing interior by providing openings in the housing. This allows the thermal shock and pressure generated during meltable conductor blowout to be released outward, preventing damage to the housing and other components while maintaining the large current capacity of the meltable conductor.
Solution Approach 2:
The patent converts the harmful thermal shock and pressure into a beneficial pressure differential. The openings allow expanding air to escape, creating a pressure difference between the interior and exterior of the housing. This pressure difference drives vaporized material outward through the openings, where it is trapped by external connection terminals, thus converting the harmful blowout energy into a controlled containment mechanism.
2Stress or pressure
If openings are provided in the housing to release expanding air, then the pressure is reduced, but vaporized material may escape and cause contamination
Solution Approach 1:
The patent converts the harmful vaporized material that escapes through the openings into a beneficial containment effect. The vaporized material exiting the openings is trapped by the external connection terminals, preventing it from contaminating the surrounding environment. The harmful blowout energy is thus redirected and contained by the external terminals.
Solution Approach 2:
The external connection terminals serve as an intermediary between the housing interior and the external environment. They first trap the vaporized material that escapes through the openings, preventing direct contamination of the surroundings. This intermediary mechanism allows pressure release while maintaining environmental cleanliness.
3Stress or pressure
If the meltable conductor is positioned to allow vaporized material to escape through openings, then pressure is released, but device damage and contamination occur
Solution Approach 1:
The patent converts the harmful vaporized material and expanding air into a controlled containment mechanism. The openings allow pressure release, and the external connection terminals trap the vaporized material, preventing device damage and contamination. The harmful blowout energy is thus transformed into a safe and controlled process.
Solution Approach 2:
The external connection terminals act as an intermediary that first receives and traps the vaporized material escaping through the openings. This intermediary mechanism ensures that the pressure release process does not result in device damage or contamination, thereby maintaining reliability while allowing pressure equalization.
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 configuration effectively manages pressure and prevents contamination by releasing air and trapping vaporized material, ensuring reliable operation and safety during meltable conductor blowout, even under high current conditions.
Implementation Method 1
a heat-generator (10) connected to the insulating substrate (2), and the meltable conductor (3) is mounted on a front surface of the insulating substrate (2) and thermally connected to the heat-generator (10)
Implementation Method 2
the meltable conductor (3) is mounted on a front surface of the insulating substrate (2) and thermally connected to the heat-generator (10) so as to be blowable by heat generation of the heat-generator (10)
Data Source
AI summary
Provided is a protecting device that can prevent damage of the device by releasing the pressure inside the housing by providing openings in the housing and can secure appropriate insulation. The protecting device includes: a meltable conductor 3; first and second external connection terminals 7, 8 connected to both ends of the meltable conductor 3; and a housing 6 having a lower case 4 and an upper case 5, wherein one end of the first external connection terminal 7 and one end of the second external connection terminal 8 are led out from the housing 6, and the housing is provided with a first opening 24 formed facing a front surface of the first external connection terminal 7 and a second opening 25 formed facing a front surface of the second external connection terminal 8.