Pressurization device for secondary battery
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Solution Overview
Problem
The challenge of safely and efficiently applying isostatic pressure to densify the structures of positive and negative layers in solid-state lithium ion secondary batteries, while ensuring reusability of the pressurization device, is not adequately addressed by existing technologies.
Innovation Solution
A pressurization device comprising a die with cavities, a sealed container and cover made of elastic material, and a vacuum-sealed pouch system that applies isostatic pressure to electrode units, allowing multiple uses and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte is used to eliminate flammability and simplify safety systems, then safety is improved and system complexity is reduced, but ultra-high-pressure processing is required to densify the structure
Solution Approach 1:
The patent changes the pressure application method from ultra-high-pressure to controlled isostatic pressure using elastic members. The elastic members (rubber or silicone) deform under pressure to uniformly distribute force on the electrode unit, achieving densification at lower pressures while maintaining safety benefits of solid electrolyte
Solution Approach 2:
The patent introduces elastic members as intermediary elements between the pressurization system and the electrode unit. These elastic members mediate the pressure transmission, converting irregular pressure into uniform isostatic pressure that effectively densifies the solid electrolyte structure without requiring extreme pressures
2Ease of manufacture
If reusable pressurization device with elastic members is used, then device cost is reduced through multiple uses, but device complexity increases due to sealed container and vacuum system
Solution Approach 1:
The pressurization device is designed as a universal reusable system where the sealed container, elastic members, and pressurization mechanism can be used for multiple electrode units. The device performs multiple functions: sealing, pressurization, and protection, reducing the need for separate components for each operation
Solution Approach 2:
The patent employs a nested structure where the electrode unit is placed inside the sealed container, which is then positioned within the pressurization chamber. The elastic members are nested within the container structure, creating a compact multi-layered system that reduces overall device footprint while maintaining functionality
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 device achieves safe and efficient isostatic pressure application, enhancing ion conductivity and enabling reuse of the pressurization components, thereby reducing costs and improving battery performance.
Implementation Method 1
the sealed container and the sealed cover comprises an elastic member
Implementation Method 2
The sealed container and the sealed cover accommodated inside the pouch are coupled in a vacuum state
Data Source
AI summary
The present invention provides a pressurization device for a secondary battery that can be used multiple times. As one embodiment, as a device for pressurizing an electrode unit in which an electrolyte is stacked between electrode plates, disclosed is a pressurization device for a secondary battery, comprising: a die having a cavity accommodating the electrode unit; a sealing container having an opening and accommodating the die in an inner space; and a sealing cover engaged with the opening of the sealing container and sealing the electrode unit with the sealing container, wherein the sealing cover under the sealing container is composed of an elastic member