Electricity Storage Pack Unfolding Vent Structure for Pressure Spikes
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Solution Overview
Problem
Existing electricity storage packs are prone to damage due to instantaneous pressure increases from gas generation, as existing designs either concentrate pressure at sealing parts or have large flow path resistances that hinder effective gas discharge.
Innovation Solution
An electricity storage pack with an unfolding member that expands to increase internal volume when pressure exceeds a threshold, featuring a flexible unfolding section, a rigid protection section, and a stopper to control unfolding, along with a vent for gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If gas discharge paths (diffusion gap and reverse injection gap) are made thin tubular to maintain compactness, then the electricity storage pack remains compact, but flow path resistance increases and gas cannot be fully discharged
Solution Approach 1:
The invention transitions from thin tubular gaps (1D/2D flow paths) to a bag-shaped expansion space (3D volume), allowing gas to discharge in multiple spatial dimensions simultaneously through multiple smoke exhaust holes, dramatically reducing flow path resistance while maintaining compact packaging
2Volume of moving object
If a folded structure expansion part is formed in the direction where electrode leads protrude to increase internal volume, then the electricity storage pack can accommodate gas expansion, but pressure concentrates at the sealing part causing potential damage
Solution Approach 1:
The invention extracts the expansion function from the sealed exterior body structure and places it in a separate bag-shaped internal space that can expand independently, preventing pressure concentration at the sealing parts of the exterior body while accommodating gas volume increases
3Reliability
If an expansion space is built into the exterior body in advance to accommodate gas, then gas can be contained, but the electricity storage pack occupies more space and loses compactness
Solution Approach 1:
The invention employs a dynamic expansion mechanism where the bag-shaped space expands from a compact folded state to a large volume state only when gas generation occurs, allowing the electricity storage pack to maintain small size during normal operation while providing adequate expansion space when needed
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 unfolding member mitigates internal pressure spikes, preventing damage to the pack by increasing volume and allowing safe gas discharge, while maintaining compactness and enabling space-efficient integration.
Implementation Method 1
when an internal pressure of the exterior body increases
Implementation Method 2
an unfolding member configured to unfold when an internal pressure of the exterior body increases, thereby increasing an internal volume of the exterior body
Data Source
Figure 1~2
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AI summary
Provided is an electricity storage pack with higher safety that suppresses an instantaneous increase in internal pressure inside an electricity storage pack. The electricity storage pack includes: a plurality of electricity storage devices electrically connected to each other; a main body of a sealtype exterior body housing the plurality of electricity storage devices; and an unfolding member configured to increase an internal volume of the exterior body when an internal pressure of the exterior body increases and exceeds a predetermined value.