Foldable Pouch Cell Pressure Jig for Directed Gas Removal
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Solution Overview
Problem
Conventional press jigs for pouch-type secondary batteries fail to effectively remove residual gas from the battery cell due to their flat shape, which impedes the movement of gas during the formation process, leading to gas entrapment within the electrode assembly.
Innovation Solution
A battery cell pressure jig with foldable pressure and support plates, equipped with elastic members and hinge mechanisms, allows sequential pressure application from the lower to the upper part of the battery cell, facilitating directed gas movement to the gas pocket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a flat-type pressure plate is used to press the battery cell, then the pressing force is uniformly distributed, but the gas cannot move easily and remains trapped inside the battery cell
Solution Approach 1:
The pressure plate is divided into multiple pressing portions (first, second, third pressing portions) that can press different regions of the battery cell separately. This segmentation allows gas to be pushed from one region to another, facilitating gas movement toward the gas pocket while maintaining uniform pressure distribution through coordinated action of multiple pressing sections.
Solution Approach 2:
The pressure plate is designed to be movable rather than fixed, allowing it to adapt its position and pressing configuration during the formation process. This dynamic capability enables the pressure plate to facilitate gas movement while maintaining contact with the battery cell, resolving the contradiction between uniform pressure and gas mobility.
2Productivity
If the entire surface of the battery cell is pressed at once, then the pressing process is simple and fast, but gas is difficult to move and remains trapped between electrodes
Solution Approach 1:
The battery cell pressing process is divided into multiple stages with different pressing portions acting at different times. The first pressing portion presses initially, then the second pressing portion presses after gas moves, followed by the third pressing portion. This segmented approach maintains high productivity by systematic coordination while enabling effective gas movement through sequential regional pressing.
Solution Approach 2:
The first pressing portion performs preliminary pressing to initiate gas movement before the second and third pressing portions act. This preliminary action creates the conditions for subsequent pressing stages to be more effective at removing gas, maintaining overall process efficiency while achieving better gas removal.
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 jig effectively suppresses the gas trap phenomenon by ensuring gas is easily directed to the gas pocket, minimizing residual gas within the battery cell.
Implementation Method 1
an elastic member coupled to a lower end of either the pressure plate or the support plate, and is compressed when the battery cell is pressed
Data Source
AI summary
A battery cell pressure jig of an embodiment of the present invention includes a first pressure block and a second pressure block pressurizing both sides of a battery cell with the battery cell interposed therebetween. The first pressure block and the second pressure block each includes: a flat-type pressure plate that presses the battery cell; a support plate supporting the pressure plate; hinge members provided at the upper edges of the pressure plate and the support plate so that the pressure plate and the support plate are mutually foldable; and an elastic member coupled to the lower end of either the pressure plate or the support plate. The battery cell pressure jig may sequentially press the battery cell from the lower portion to the upper portion.