Pouch Cell Gas Discharge Pipe for Sealing Integrity and Gas Release
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Solution Overview
Problem
The existing manufacturing methods for pouch cells face issues with poor sealing quality due to electrolyte solution staining and increased pressure from gas generated during charging and discharging, leading to potential venting phenomena that compromise the safety and functionality of the battery.
Innovation Solution
Incorporating a gas discharge pipe with multiple layers, including a high gas permeability transmission layer, to efficiently discharge gases outside the pouch while minimizing electrolyte solution staining during the sealing process, thereby improving sealing quality and preventing venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolyte solution is injected into the pouch during manufacturing, then the battery becomes functional, but the sealing quality deteriorates due to electrolyte solution staining
Solution Approach 1:
The gas discharge pipe is installed and positioned before the electrolyte solution is injected into the pouch. This preliminary action allows the sealing to be performed on a dry surface, preventing electrolyte staining, while the pipe remains in place to serve its dual function of sealing and future gas discharge
2Strength
If the pouch is sealed tightly to maintain structural integrity, then the pouch strength is improved, but gas accumulation occurs during charging-discharging cycles
Solution Approach 1:
The gas discharge pipe incorporates a porous membrane or porous material that allows gas molecules to pass through while maintaining the sealing integrity. This porous structure enables selective permeability - blocking liquid electrolyte while allowing gas diffusion, thus resolving the contradiction between tight sealing and gas release
Solution Approach 2:
The gas discharge pipe uses composite material structure combining materials with different properties - one layer for sealing and impermeability to liquid, another layer with gas permeability. This composite structure allows simultaneous achievement of strong sealing and gas discharge functionality
3Reliability
If a gas discharge pipe is added to enable gas discharge, then venting prevention is improved, but the device complexity increases
Solution Approach 1:
The gas discharge pipe is designed to serve multiple functions: it acts as both a sealing element (maintaining pouch integrity) and a gas discharge pathway (enabling gas release). By integrating these two functions into a single component, the design avoids adding separate complex systems while achieving venting prevention
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 reduces electrolyte solution staining, enhances sealing quality, and allows for controlled gas discharge, delaying or preventing venting, thus improving the safety and stability of the pouch cell.
Implementation Method 1
a transmission layer arranged between the inner layer and the outer layer, the transmission layer having a higher gas permeability than both of the inner layer and the outer layer
Implementation Method 2
an inner layer and an outer layer which are heat scalable
Data Source
AI summary
A pouch cell manufacturing method of the present disclosure prevents the sealing quality of a pouch from being deteriorated by an electrolyte solution, by reducing the amount of the electrolyte solution staining the sealing portion in the pouch, and a pouch cell in which gas inside the pouch can be efficiently discharged to the outside of the pouch is provided. The pouch cell of the present disclosure includes: an electrode assembly; a pouch within which the electrode assembly is accommodated; and a gas discharge pipe that is disposed such that the gas discharge pipe extends from the inside of the pouch to the outside, in which gas inside the pouch can be transmitted through the gas discharge pipe and discharged to the outside of the pouch.