Dot-Pattern Heated Press Jig for Pouch Cell Gas Removal
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Solution Overview
Problem
Conventional pressurizing methods for secondary batteries during cell activation fail to efficiently remove generated gas, leading to gas accumulation and deformation of pouch-type batteries, as they lack uniform pressure distribution and effective gas discharge mechanisms.
Innovation Solution
A pressurizing jig with a pair of plate-shaped members featuring independently formed protrusions in a dot pattern, which applies uniform pressure and heat to the secondary battery, facilitating the expansion and directed discharge of trapped gas during the cell activation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional pressurizing methods are used during cell activation, then the secondary battery can be pressurized, but gas cannot be efficiently removed leading to accumulation and deformation
Solution Approach 1:
The pressurizing jig is divided into multiple pressing portions (first pressing portion and second pressing portion) that can independently apply pressure to different regions of the battery. This segmentation allows simultaneous pressurization and gas discharge by directing gas toward specific discharge ports while maintaining uniform pressure distribution across the battery structure.
Solution Approach 2:
Different regions of the pressurizing jig have different functions: the first pressing portion applies pressure to push gas toward discharge ports, while the second pressing portion maintains overall pressure distribution. This local differentiation of pressing functions enables efficient gas removal without causing battery deformation.
2Manufacturing precision
If uniform pressure is applied to the secondary battery, then deformation is prevented, but gas discharge becomes less efficient
Solution Approach 1:
The pressing force is segmented into multiple independent pressing portions that can be controlled separately. The first pressing portion concentrates force to drive gas toward discharge ports, while the second pressing portion distributes pressure uniformly across the battery, achieving both efficient gas discharge and uniform pressure distribution simultaneously.
Solution Approach 2:
The pressurizing system operates in multiple dimensions by applying pressure from different locations and directions. The first pressing portion applies localized pressure in a specific direction to push gas toward discharge ports, while the second pressing portion applies distributed pressure from multiple points to maintain uniform overall pressure, solving the contradiction through spatial dimensionality.
3Ease of manufacture
If pressure is concentrated on specific areas, then gas discharge is improved, but uniform pressurization is reduced
Solution Approach 1:
The pressurizing jig is segmented into multiple independent pressing portions: the first pressing portion concentrates pressure on specific areas to efficiently discharge gas, while the second pressing portion applies distributed pressure to maintain overall uniformity. This segmentation allows simultaneous achievement of localized gas discharge efficiency and global pressure uniformity.
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 ensures uniform pressurization and efficient gas discharge from the secondary battery, preventing deformation and enhancing battery performance by concentrating pressure and heat on specific areas, allowing for effective removal of internal gas.
Implementation Method 1
a heating unit that heats the projections formed on the plate-shaped member
Data Source
AI summary
A press jig includes a pair of plate-shaped members, each of which includes a plurality of protrusions spaced apart from each other on a surface thereof, the protrusions being configured to come into contact with the secondary battery when pressed; and a heating unit that heats the protrusions formed on the plate-shaped member. A method of manufacturing a secondary battery using the same is also provided.