Secondary Battery Venting Delay Device
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Solution Overview
Problem
Secondary batteries face issues with venting due to internal gas pressure, leading to potential explosions and electrical hazards, as the existing sealing mechanisms fail to effectively delay or prevent the breakage of sealing parts.
Innovation Solution
A secondary battery assembly with a venting delay device featuring protrusions or inner grooves that overlap with the side sealing parts, designed to prevent and delay the breakage of sealing parts by distributing pressure and maintaining the integrity of the battery's structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas is generated inside the battery and pressure increases, then the battery swells and eventually the sealing part breaks causing venting, but this exposes the battery to explosion and electrical hazards
Solution Approach 1:
The patent applies preliminary action by pre-forming a bent portion in the side sealing part before the battery is assembled. This bent portion is positioned to contact the protrusion of the venting delay device, creating a pre-configured pressure relief mechanism that will engage only when internal pressure exceeds a certain threshold, thereby preventing catastrophic failure while allowing controlled venting
Solution Approach 2:
The patent implements beforehand cushioning by designing the bent portion of the side sealing part to absorb and distribute internal pressure before it reaches critical levels. The bent portion acts as a cushioning element that deforms elastically under pressure, delaying the point at which the sealing part would otherwise break and causing uncontrolled venting
2Reliability
If the side sealing part is made more robust to prevent breakage, then safety improves, but the battery structure becomes more complex and manufacturing becomes harder
Solution Approach 1:
The patent applies segmentation by dividing the side sealing part into distinct functional zones: a straight portion for sealing, a bent portion for pressure absorption, and a free end for venting. This segmentation allows each portion to perform its specific function optimally without requiring the entire sealing part to be overly robust, thereby maintaining simplicity while improving reliability
Solution Approach 2:
The patent introduces an intermediary element - the bent portion of the side sealing part - that mediates between the internal pressure and the main sealing structure. This bent portion acts as a buffer zone that absorbs stress before it reaches the critical sealing joints, preventing breakage without requiring the entire sealing part to be strengthened
3Reliability
If the bent portion of the side sealing part contacts the protrusion of the venting delay device, then venting is delayed and safety improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by concentrating the precision requirement to a specific location - the contact point between the bent portion and the protrusion - rather than requiring high precision throughout the entire battery assembly. The bent portion is designed with specific geometric characteristics (radius, angle, length) that ensure proper engagement with the protrusion, while other parts of the battery can be manufactured with standard tolerances
Data Source
AI summary
Proposed is a secondary battery assembly. A secondary battery assembly according to an embodiment includes a secondary battery having, at an end or each end thereof, an electrode tab including a tab sealing part, and a side sealing part bent on a side surface thereof to a predetermined length, and a venting delay device including a protrusion formed to be spaced apart and face the bent side sealing part. According to the embodiment, it is possible to effectively prevent and delay breakage of a fusion portion of a sealing part of a secondary battery from occurring due to pressure caused by discharge of gas generated inside the secondary battery.