Sealed Battery Vent Groove Structure for Impact-Resistant Pressure Release
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Solution Overview
Problem
The increase in size of sealed batteries leads to increased pressure on gas discharge vents, causing stress concentration at intersections, which can result in breakage due to impacts or vibrations, compromising the reliability and safety of the battery.
Innovation Solution
A sealed battery design featuring a gas discharge vent with linear grooves and a flat portion at the intersection, where the width of the bottom is smaller than the opening, to distribute stress and enhance impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the gas discharge vent is increased to meet larger battery size requirements, then the pressure receiving area is increased, but the remaining wall thickness of each groove must be reduced, leading to stress concentration at intersections and increased likelihood of breakage
Solution Approach 1:
The patent applies local quality by providing a flat portion specifically at the groove intersections where stress concentrates. This local structural modification makes the intersection area stronger and more impact-resistant compared to the tapered groove walls, allowing the vent to maintain integrity while having a larger overall size for adequate pressure receiving area.
2Area of stationary object
If the remaining wall thickness of grooves is reduced to accommodate larger vent size, then the pressure receiving area increases, but the gas discharge vent becomes more susceptible to breakage from impacts and vibrations
Solution Approach 1:
The flat portion at groove intersections provides localized reinforcement that does not reduce the overall pressure receiving area. This local quality enhancement specifically addresses impact and vibration resistance at the most vulnerable points (intersections) while maintaining the larger vent size needed for adequate pressure reception in large batteries.
Solution Approach 2:
The flat portion acts as a cushioning feature that absorbs and distributes impact forces before they can propagate through the groove intersections. This beforehand cushioning design prevents breakage from impacts and vibrations while allowing the vent to maintain its larger size for adequate pressure receiving area.
3Area of stationary object
If cross-shaped grooves are used to form the gas discharge vent, then the vent can provide adequate pressure receiving area, but stress concentrates at the intersections making breakage more likely
Solution Approach 1:
The patent maintains the cross-shaped groove configuration for adequate pressure receiving area but applies local quality enhancement by adding flat portions at the intersections. This local modification redistributes the stress that would otherwise concentrate at these points, allowing the cross-shaped design to function effectively without the stress concentration problem.
Data Source
AI summary
This sealed battery is provided with a bottomed tubular outer can for accommodating an electrode body, and a sealing body for sealing an opening part of the outer can. The outer can has a gas exhaust valve which ruptures when the pressure inside the battery reaches a predetermined value. The gas exhaust valve includes a plurality of linear grooves. The sealed battery is characterized in that; the cross-sectional shape of the grooves is a tapering shape in which the width of open ends on the side of the surface of the outer can is shorter than the width of the bottom; the grooves have at least one crossing part; and the crossing part has a flat section in the bottom.