Solid-State Battery Press Plate Reinforcement for Uniform Cell Pressure
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Solution Overview
Problem
All-solid rechargeable batteries face challenges in uniform pressurization, leading to uneven interface contact and reduced performance, particularly in large-area cells where pressure deviations between central and peripheral areas can significantly impact lithium ion mobility and overall battery efficiency.
Innovation Solution
An all-solid rechargeable battery pressurization apparatus featuring an upper and lower pressure plate with a central thickness reinforcing member, fastening members, and pressure adjustment members, including coil springs, to uniformly apply pressure and minimize pressure deviations across the cell, ensuring smooth interface contact and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional pressure plate structure is used without a thickness reinforcing member, then the device complexity is low, but pressure deviation between central and peripheral areas of the all-solid cell increases
Solution Approach 1:
A thickness reinforcing member is positioned at the central area of the upper pressure plate to locally increase thickness and rigidity. This local modification ensures uniform pressure distribution across the all-solid cell without requiring complex overall structural changes, thereby resolving the contradiction between pressure uniformity and device complexity.
2Productivity
If pressure is applied to large-area all-solid cells, then the battery capacity and energy density can be improved, but pressure deviation between central and peripheral areas increases leading to uneven interface contact
Solution Approach 1:
The thickness reinforcing member is strategically positioned at the central area where pressure deviation is most significant. This local reinforcement compensates for the natural pressure gradient in large-area cells, ensuring uniform interface contact across the entire cell area while maintaining high battery performance.
Solution Approach 2:
The solution addresses the two-dimensional pressure distribution problem by introducing a vertical dimension element (thickness reinforcing member) that modifies the pressure plate's structural properties. This vertical reinforcement translates to improved horizontal pressure uniformity across the cell surface.
3Manufacturing precision
If the thickness reinforcing member is made thicker to improve pressure uniformity, then pressure deviation is minimized, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of uniformly increasing the thickness of the entire pressure plate, only the central area is reinforced with a thickness reinforcing member. This localized approach achieves the necessary pressure uniformity while minimizing manufacturing complexity and ease of fabrication.
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 minimizes pressure deviations within the all-solid cell, enhancing lithium ion mobility and overall battery performance by ensuring uniform pressurization, thus improving the capacity and energy density of large-area cells.
Implementation Method 1
Each of the pressure adjustment members may include a coil spring
Data Source
AI summary
An all-solid rechargeable battery pressurization apparatus includes: an upper pressure plate and a lower pressure plate that are spaced apart and face each other. The pressure plates are configured to contact with opposite surfaces of an all-solid cell to apply pressure to the surfaces. A pressurizing member fastens the upper and lower pressure plates to each other and is configured to provide pressure to the all-solid cell. A thickness reinforcing member is positioned in a central area of an upper surface of the upper pressure plate.