Electricity Storage Pack Unfolding Structure for Pressure Relief
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Solution Overview
Problem
Existing electricity storage packs face damage due to instantaneous pressure increases from gas generation, as existing solutions either suffer from high flow path resistance in gas discharge or concentration of pressure at sealing parts, leading to potential damage.
Innovation Solution
An electricity storage pack with an unfolding member that expands the internal volume when internal pressure rises, comprising a box-shaped rigid main body, a vent, a flexible unfolding section, and a stopper that releases when pressure exceeds a predetermined value, along with a sensor to detect unfolding, ensuring safe pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If gas is discharged through thin tubular diffusion gap and reverse injection gap, then gas can be directed to expansion space, but flow path resistance becomes large and gas cannot be fully discharged
Solution Approach 1:
The patent pre-forms an expansion space within the battery pack housing before gas generation occurs. This expansion space serves as a preliminary buffer zone that temporarily accommodates generated gas, reducing the immediate pressure surge and allowing controlled discharge through the diffusion gap and reverse injection gap without excessive flow resistance.
Solution Approach 2:
The gas discharge path is segmented into multiple components: the expansion space, the diffusion gap, and the reverse injection gap. This segmentation allows each component to perform its specific function - the expansion space buffers gas, the diffusion gap distributes flow, and the reverse injection gap directs gas - thereby reducing overall flow resistance while maintaining directional control.
2Volume of stationary object
If folded structure expansion part is formed in direction where electrode leads protrude, then expansion space is created, but pressure concentrates in sealing part causing damage
Solution Approach 1:
Instead of expanding in the direction of electrode leads (one dimension), the patent creates expansion space by utilizing the vertical dimension between the battery cells and the housing top surface. This dimensional change allows volume increase without concentrating pressure on the sealing parts at the electrode lead ends.
Solution Approach 2:
The patent applies different structural qualities to different parts of the housing. The main body maintains rigid sealing structures, while the expansion space area is designed with flexible or removable components that can accommodate pressure changes without compromising the integrity of the sealing parts.
3Strength
If high rigidity sealed exterior body is used, then housing strength is improved, but damage occurs when internal pressure increases instantaneously
Solution Approach 1:
The patent incorporates an expansion space as a beforehand cushioning mechanism within the rigid exterior body. When gas is generated and internal pressure increases, this pre-designed space temporarily absorbs the pressure surge, cushioning the rigid exterior body from damage while maintaining overall structural strength.
Solution Approach 2:
The patent introduces dynamic elements into the otherwise rigid exterior body system. The expansion space can expand to accommodate pressure changes, and certain components like the removable cover or flexible diaphragm can move dynamically in response to pressure variations, allowing the rigid structure to handle transient pressure loads without damage.
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 solution effectively suppresses instantaneous pressure increases, preventing damage to the pack by increasing internal volume and allowing safe gas discharge, while maintaining compactness and efficient use of space.
Implementation Method 1
when an internal pressure of the exterior body increases
Implementation Method 2
increasing an internal volume of the exterior body
Data Source
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 seal-type 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.