Sealed Battery Safety Valve with Differential Exhaust Holes
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Solution Overview
Problem
Existing sealed type batteries face issues with electrolyte and inflammable gas scattering during normal use or early stages of abnormal conditions, while high-temperature gas is not reliably exhausted, potentially leading to battery swelling or explosion.
Innovation Solution
A sealed type battery design featuring a sealing member with specific gas exhaust holes, where at least one hole has a ratio of area to the battery opening between 3.0×10−5 and 9.1×10−3, and is made of a material with a melting point lower than high-temperature gas, allowing controlled gas release during normal and abnormal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety valve is provided to exhaust gas generated in the battery, then the battery case can be prevented from swelling and exploding, but electrolyte and inflammable gas may scatter widely around the battery during normal use or early stage abnormal conditions
Solution Approach 1:
The sealing member incorporates multiple gas exhaust holes with different area ratios tailored to specific functional requirements. Some holes have area ratios within 3.0×10−5 to 9.1×10−3 to prevent harmful scattering during normal operation, while other holes have larger area ratios to enable rapid gas discharge during severe abnormal conditions. This localized differentiation of exhaust hole characteristics resolves the contradiction between preventing gas scattering and ensuring battery safety.
2Object-generated harmful factors
If gas exhaust holes with small area ratios are used to prevent electrolyte and inflammable gas scattering, then harmful factor dispersion is reduced, but high-temperature gas may not be reliably exhausted during rapid gas generation stages
Solution Approach 1:
The sealing member is divided into multiple functional segments with different gas exhaust hole characteristics. Small area ratio holes (3.0×10−5 to 9.1×10−3) handle normal operation and early abnormal conditions to prevent scattering, while large area ratio holes handle rapid gas generation stages to ensure reliable high-temperature gas exhaustion. This segmentation allows each portion to specialize in specific operational scenarios, resolving the contradiction between preventing scattering and ensuring reliable exhaustion.
3Device complexity
If a single type of gas exhaust hole is provided, then the structure is simple, but it cannot simultaneously prevent gas scattering during normal use and reliably exhaust high-temperature gas during abnormal conditions
Solution Approach 1:
The sealing member is designed as a multi-functional component that simultaneously performs different gas exhaust functions through multiple holes with varying area ratios. The same sealing member structure handles both normal operation (preventing scattering) and abnormal conditions (reliable exhaustion) without requiring separate components, thus maintaining structural simplicity while achieving comprehensive gas management functionality.
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 battery effectively prevents electrolyte and inflammable gas scattering during normal use and reliably exhausts high-temperature gas during abnormal conditions, enhancing safety and minimizing adverse effects on devices.
Implementation Method 1
a safety valve in a sealing member through which gas generated in the battery is exhausted to the outside of the battery when the pressure in the battery is increased
Implementation Method 2
a member including a gas exhaust hole having a ratio of an area of the gas exhaust hole to an area of the opening of the case of 3.0×10−5 or more and 9.1×10−3 or less is formed of a member having a melting point lower than a melting point of high-temperature gas generated in an abnormal time
Data Source
AI summary
The battery is sealed by a sealing member including a safety valve for exhausting the gas generated in the battery to the outside of the battery when the pressure in the battery is increased. A part of the sealing member is formed of a member having a melting point lower than that of high-temperature gas generated in the abnormal time and having a ratio of an area of an opening of the battery case to an area of a gas exhaust hole is 3.0×10−5 or more and 9.1×10−3 or less.