Pouch Battery Gas Vent Resealing to Prevent Continuous Discharge
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Solution Overview
Problem
Secondary batteries face issues with continuous discharge of electrolyte and gas due to weak sealing in the pouch, leading to secondary contamination and accidents.
Innovation Solution
A secondary battery design incorporating a self-restoring adhesive means with a gas discharge part that opens and reseals using a first adhesive material and a self-restoring adhesive member to prevent continuous discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas discharge part is provided to release gas when internal pressure increases, then gas discharge safety is improved, but the sealing part remains vulnerable to opening and continuous discharge of electrolyte and gas occurs
Solution Approach 1:
The gas discharge part is pre-configured with a first adhesive material that has lower adhesive strength than the sealing part. This preliminary design ensures that when internal pressure increases, the gas discharge part opens first to release gas, preventing the sealing part from opening and avoiding continuous discharge of electrolyte and gas.
Solution Approach 2:
The adhesive strength parameter of the adhesive material is specifically controlled to be lower than that of the sealing part. This parameter differentiation ensures selective opening: the gas discharge part opens at lower pressure while the sealing part remains intact, preventing harmful continuous discharge.
2Stress or pressure
If the gas discharge part is opened to release gas, then internal pressure is reduced, but the gas discharge part remains open causing continuous discharge of residual electrolyte and gas
Solution Approach 1:
The gas discharge part implements periodic opening and closing action. It opens when internal pressure increases to release gas, then closes when pressure decreases. This periodic action prevents continuous discharge of residual electrolyte and gas while effectively managing internal pressure.
Solution Approach 2:
The gas discharge part is designed with dynamic opening and closing capability through the adhesive material that can break and reform. The part transitions between open and closed states based on internal pressure conditions, enabling adaptive pressure management without continuous substance loss.
3Object-affected harmful factors
If a self-restoring adhesive member is added to reseal the gas discharge part, then prevention of continuous discharge is improved, but device complexity increases
Solution Approach 1:
The self-restoring adhesive member contains a second adhesive material that automatically restores the sealing function of the gas discharge part after gas release. The adhesive material self-repairs the opening without external intervention, preventing continuous discharge while adding minimal complexity through a single integrated component.
Solution Approach 2:
The adhesive system uses composite materials with different adhesive strengths: a first adhesive material for initial sealing that breaks at lower strength, and a second adhesive material in the self-restoring member that reforms the seal. This composite approach achieves automatic resealing with controlled complexity.
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
Prevents continuous discharge of electrolyte and gas, thereby preventing secondary contamination and accidents by effectively resealing the gas discharge part.
Implementation Method 1
a first adhesive material which is configured to seal the gas discharge part through adhesive force and is broken when a pressure within the pouch increases above a set pressure
Implementation Method 2
a self-restoring adhesive member configured to reseal the opened gas discharge part through the adhesive force
Implementation Method 3
when a gap between the inner circumferential surface of the discharge port and the outer circumferential surface of the opening/closing surface is widened by the gas discharged to the gas discharge part, the capsule is split or broken to allow the second adhesive material to flow out
Data Source
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AI summary
The present invention relates to a secondary battery comprising: an electrode assembly; a pouch in which the electrode assembly is accommodated and provided with a gas discharge part; a first adhesive material which is configured to seal the gas discharge part through adhesive force, wherein, when a pressure within the pouch increases, the adhesive force of the first adhesive material is broken to open the gas discharge part; and a self-restoring adhesive member configured to reseal the opened gas discharge part through the adhesive force so as to prevent the gas from being discharged to the gas discharge part.