Pouch Cell Gas Discharge Pipe for Clean Sealing and Pressure Relief
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Solution Overview
Problem
The sealing quality of pouch cells is compromised by electrolyte solution staining during manufacturing, and internal gas pressure can cause venting and loss of function due to increased pressure.
Innovation Solution
Incorporating a gas discharge pipe with multiple layers, including a high gas permeability layer, to efficiently discharge gas and reduce electrolyte solution staining, ensuring the sealing quality and stability of the pouch cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolyte solution is injected into the pouch during manufacturing, then the pouch cell can function properly, but the sealing quality deteriorates due to electrolyte solution staining
Solution Approach 1:
The gas discharge pipe is divided into multiple functional layers: an inner layer for electrolyte solution injection, a transmission layer for gas permeation, and an outer layer for sealing. This segmentation allows each layer to perform its specific function without interfering with others, enabling electrolyte injection while maintaining sealing quality.
Solution Approach 2:
The transmission layer acts as an intermediary between the inner layer (electrolyte injection) and outer layer (sealing). It allows gas to pass through while blocking electrolyte solution, mediating between the need for electrolyte injection and the requirement for clean sealing.
2Reliability
If gas accumulates inside the pouch during charging-discharging, then the pouch cell operates normally, but internal pressure increases causing venting and loss of function
Solution Approach 1:
The transmission layer is made of porous PTFE material that allows gas molecules to pass through while blocking larger electrolyte solution molecules. This enables continuous gas discharge during charging-discharging cycles, preventing pressure buildup and venting while maintaining the pouch's functional integrity.
Solution Approach 2:
The gas discharge pipe provides continuous gas discharge capability throughout the pouch cell's operational life. The transmission layer's continuous porous structure allows gas to escape continuously during charging and discharging, preventing intermittent pressure spikes that would cause venting.
3Object-generated harmful factors
If a gas discharge pipe is added to the pouch cell, then gas can be discharged effectively, but the device complexity increases
Solution Approach 1:
The gas discharge pipe serves multiple functions: it acts as a seal for the pouch, provides a pathway for gas discharge, and enables electrolyte solution injection during manufacturing. By combining these functions into a single component, the overall device complexity is minimized despite the added functionality.
Solution Approach 2:
The gas discharge pipe is constructed as a composite structure with three different material layers, each providing specific properties. This composite approach allows a single component to achieve gas permeability, electrolyte blocking, and sealing capabilities without requiring multiple separate parts.
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 improves sealing quality by minimizing electrolyte solution staining and effectively discharges internal gas, preventing venting and enhancing 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 sealable
Data Source
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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 of 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.