Pouch Battery Degassing with Size-Based Gas Discharge Control
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Solution Overview
Problem
The existing degassing systems for pouch-type secondary batteries face inefficiencies in gas pocket size determination, leading to increased production costs and potential insulation damage during the activation process, as the size of the gas pocket must be oversized to accommodate varying gas generation, which is inefficient and costly.
Innovation Solution
A degassing system that includes a separation unit with adsorption plates, a gas discharge unit, and a foreign substance removing unit, featuring adjustable suction forces and pressure control valves to manage gas discharge based on pouch size, allowing for precise gas removal and detection of abnormalities through comparison with preset reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas pocket portion is formed as large as possible to prevent insulation destruction during activation, then reliability is improved, but manufacturing cost increases due to material waste and inefficiency
Solution Approach 1:
The patent makes the gas pocket portion dynamically adjustable by introducing a partition wall that can be moved between an inserted state (during activation) and a retracted state (after degassing). This allows the gas pocket size to adapt to different process stages: large during activation to ensure reliability, and small after degassing to improve manufacturing efficiency and reduce material waste.
Solution Approach 2:
The patent segments the pouch interior by introducing a partition wall that divides the pouch into a cell body and a gas pocket portion. This segmentation allows the gas pocket to be a distinct, controllable space that can be properly sized and managed, preventing both insulation damage and material waste by optimizing the gas pocket dimensions independently from the overall pouch size.
2Adaptability or versatility
If the gas pocket portion is formed large to accommodate varying gas generation, then adaptability is improved, but loss of substance increases due to excessive material usage
Solution Approach 1:
The partition wall enables the gas pocket portion to dynamically adjust its size. During activation, it can accommodate maximum gas generation across different electrode materials and conditions. After degassing, the partition wall is retracted to minimize the gas pocket size, thereby reducing material waste while maintaining the adaptability needed during the activation process.
3Device complexity
If a simple hole formation method is used for gas drainage, then device complexity is reduced, but productivity decreases due to manual intervention requirements
Solution Approach 1:
The system incorporates an automated needle device that performs hole formation and gas drainage without manual intervention. The needle is automatically inserted through the pouch, connected to vacuum equipment for gas removal, and then withdrawn automatically. This self-service automation maintains relative system simplicity while dramatically improving productivity by eliminating manual steps and enabling continuous processing.
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
This system enables efficient and cost-effective gas removal from secondary battery pouches, ensuring quality while reducing production costs by allowing for customizable degassing processes based on pouch size and automatically detecting any abnormalities in the suction line.
Implementation Method 1
a separation unit including an adsorption plate for adsorbing at least one surface of the pouch, and a degassing adsorption plate disposed inside the adsorption plate and adsorbing the pouch inside of the adsorption plate, the adsorption plate and the degassing adsorption plate providing adsorption force required for pouch adsorption
Implementation Method 2
a foreign substance removing unit removing a discharge mixed with gas respectively flowing into the suction passage and the gas discharge path
Data Source
AI summary
A degassing system of a pouch for a secondary battery is provided. In the degassing system, after inhaling gas regardless of the size of a cell pocket, the gas may be processed, and the convenience of work may be increased by setting the period of degassing time or the amount of gas to be discharged according to the size of a pouch, and an abnormality in a suction line for degassing may be automatically detected according to a comparison value by comparing the amount of discharged gas with a reference value preset by each pouch size.