Pouch Battery Degassing Using Vacuum Separation and Needle Extraction
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Solution Overview
Problem
The existing degassing processes for pouch-type secondary batteries are inefficient due to the variability in gas generation during the activation process, leading to oversized gas pocket portions that are unnecessary and costly to manufacture, and may compromise the insulation of the sealing portion.
Innovation Solution
A degassing apparatus with a separation unit and a gas removal unit that uses an adsorption plate to form a space within the pouch and a needle with a gas discharge path to remove gas, along with a foreign matter removal unit and an adjusting mechanism to ensure complete gas extraction, regardless of the pouch size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas pocket portion is formed to be as large as possible to prevent insulation destruction during activation, then the sealing reliability is improved, but the manufacturing cost increases and production efficiency decreases
Solution Approach 1:
The patent applies preliminary action by performing degassing during the pouch sealing process itself, rather than relying on a large gas pocket to handle gas generated during subsequent activation. The gas removal unit creates a hole and removes gas through suction during sealing, proactively preventing gas accumulation that would later require oversized gas pockets.
Solution Approach 2:
The patent extracts the gas removal function from the traditional large gas pocket structure. Instead of relying on a large gas pocket portion to contain and manage gas, the system uses a gas removal unit with a needle and suction mechanism to actively extract gas during sealing, eliminating the need for excessive gas pocket size.
2Reliability
If the gas pocket portion is formed to be as large as possible to prevent insulation destruction during activation, then the sealing reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The gas removal unit performs preliminary gas extraction during the sealing process, preventing the need for large gas pockets that would increase material usage and manufacturing complexity. By removing gas proactively during sealing, the system ensures reliability without the cost penalty of oversized gas pockets.
Solution Approach 2:
The patent extracts the gas management function from the gas pocket structure itself, using a dedicated gas removal unit with needle and suction mechanism. This separation allows for minimal gas pocket sizing while maintaining reliability, thereby reducing material costs and manufacturing complexity associated with large gas pockets.
3Reliability
If the gas pocket portion is made larger to accommodate variable gas generation, then the reliability is improved, but the device complexity and unnecessary material usage increase
Solution Approach 1:
The system performs preliminary gas removal during sealing through the gas removal unit, ensuring that gas generated during activation will not compromise sealing integrity. This proactive approach allows for simpler pouch structures without large gas pockets, as gas is managed during sealing rather than accommodated through oversized structures.
Solution Approach 2:
The gas removal unit acts as an intermediary mechanism between the pouch interior and exterior, providing a controlled pathway for gas removal during sealing. This intermediary system eliminates the need for complex oversized gas pocket structures, simplifying the overall pouch design while maintaining reliability.
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 apparatus effectively removes gas from the pouch, ensuring quality while reducing production costs by eliminating the need for oversized gas pocket portions and maintaining the integrity of the sealing insulation.
Implementation Method 1
a space between the inside of the adsorption plate, an outside of the degassing adsorption plate and the pouch may have a watertight structure to form a vacuum state
Implementation Method 2
a gas removal unit installed on the adsorption plate, piercing the pouch with a needle having a gas discharge path therein, and removing gas from the pouch through the gas discharge path
Data Source
AI summary
A degassing device of a pouch for a secondary battery and a degassing device using the same are provided. The degassing apparatus includes a separation unit including an adsorption plate adsorbing at least one surface of the pouch, and forming a space inside of the pouch by pulling the adsorption plate, and a gas removal unit installed on the adsorption plate, piercing the pouch with a needle having a gas discharge path therein, and removing gas from the pouch through the gas discharge path.