Endothermic Pouch Venting Structure for Battery Thermal Runaway
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Solution Overview
Problem
Secondary batteries are prone to thermal runaway, leading to heat propagation and increased fire risk when grouped together, as existing technologies fail to effectively suppress and manage heat dissipation and maintain the shape of endothermic pouches.
Innovation Solution
An endothermic pouch assembly with a liquid-impregnated absorbent material and a pouch cartridge that includes a heat-fusion sealing portion with vulnerable areas and venting induction holes, allowing for precise positioning and effective heat absorption and dissipation, reducing the risk of fire by releasing gas safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If endothermic pouches are used to suppress heat propagation, then thermal runaway suppression is improved, but the pouches cannot maintain their shape and cannot be positioned correctly
Solution Approach 1:
The patent uses a flexible pouch structure with heat-fusion sealing to contain the endothermic material. The pouch is sealed along its rim to maintain shape while allowing the material inside to absorb heat. The flexible nature of the pouch allows it to conform to the battery surface while maintaining structural integrity through the sealed rim.
2Reliability
If heat-fusion sealing is used to seal the endothermic pouch, then sealing effectiveness is improved, but the sealing portion becomes vulnerable to bursting under pressure
Solution Approach 1:
The patent applies local quality by creating vulnerable portions with reduced thickness or strength at specific locations within the heat-fusion sealing portion. These localized weak points are strategically positioned to control where the pouch will burst if pressure builds up, while the rest of the sealing maintains full strength for effective sealing.
3Use of energy by moving object
If the endothermic pouch is sealed completely, then heat absorption efficiency is improved, but gas buildup from liquid vaporization cannot be released safely
Solution Approach 1:
The patent incorporates venting induction holes and vulnerable portions in advance during pouch manufacturing. These features are pre-positioned to allow controlled gas release when the endothermic liquid vaporizes and generates pressure, preventing dangerous buildup while maintaining sealing integrity under normal operating conditions.
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 endothermic pouch assembly quickly absorbs and dissipates heat, preventing thermal runaway and maintaining performance by vaporizing liquid and releasing gas through designed venting, thereby reducing the risk of fire and ensuring precise placement between secondary batteries.
Implementation Method 1
an endothermic pouch with liquid-impregnated absorbent material sealed inside
Implementation Method 2
allowing gas inside the endothermic pouch to be inductively ejected
Implementation Method 3
the liquid impregnated in the superabsorbent matrix absorbs heat, causing a phase change to gas
Implementation Method 4
a heat-fusion sealing portion formed along a rim of the endothermic pouch
Data Source
AI summary
An endothermic pouch assembly includes an endothermic pouch with liquid-impregnated absorbent material sealed inside, and a pouch cartridge including a pair of rim frames that bind a heat-fusion sealing portion formed along the rim of the endothermic pouch at both sides.