Solid-State Battery Elastic Sheet for Uniform Stacking Pressure
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Solution Overview
Problem
Solid-state rechargeable batteries face challenges in maintaining uniform pressure and preventing air bubble formation during the stacking process, which can lead to inefficient lithium ion movement and reduced discharge efficiency due to misalignment and non-uniform pressurization.
Innovation Solution
Incorporating an elastic sheet with a structure of protrusions and depressions on the outer surface of the laminate, which buffers volume changes during charge and discharge, ensuring accurate alignment and uniform pressurization by forming a uniform air passage and preventing bubble formation between the negative electrode, solid electrolyte layer, and positive electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid-state rechargeable battery is assembled with stacked electrodes and solid electrolyte, then high energy density and safety are achieved, but uniform pressure distribution and alignment during stacking become difficult to maintain
Solution Approach 1:
The patent introduces a flexible elastic sheet as a thin film component with protrusions and depressions that conforms to the battery's volume changes. This elastic sheet maintains uniform pressure distribution across the stacked electrodes and solid electrolyte layers while accommodating expansion and contraction during charge-discharge cycles, thereby preserving both manufacturing precision and battery reliability.
Solution Approach 2:
The elastic sheet is pre-designed with a specific structure of protrusions and depressions before assembly, providing beforehand cushioning that compensates for volume changes during operation. This pre-configured cushioning structure ensures that uniform pressure is maintained from the outset, preventing misalignment and ensuring consistent contact between components throughout the battery's operational life.
2Stability of the object's composition
If the battery structure is made rigid to maintain shape, then structural stability is improved, but volume changes during charge and discharge cause misalignment and air bubble formation
Solution Approach 1:
The patent replaces rigid structural elements with a dynamic elastic sheet that can adapt its shape in response to volume changes during charge and discharge. The elastic sheet's flexible structure with protrusions and depressions allows it to dynamically conform to the battery's expanding and contracting form, maintaining stable contact between components without causing misalignment or air bubble formation, thus preserving both structural stability and operational reliability.
3Reliability
If pressure is increased to prevent air bubbles, then discharge efficiency is improved, but the battery components may deform or damage due to non-uniform pressure distribution
Solution Approach 1:
The elastic sheet features a non-uniform structure with localized protrusions and depressions that distribute pressure evenly across different regions of the battery. This local quality variation in the elastic sheet's structure ensures that pressure is applied uniformly to all components, preventing deformation or damage while maintaining the high pressure needed to prevent air bubbles and ensure efficient discharge.
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 elastic sheet with a structure of protrusions and depressions ensures accurate alignment and uniform pressurization, enhancing lithium ion movement and discharge efficiency by preventing air bubbles and ensuring consistent pressure across the battery components.
Implementation Method 1
an elastic sheet including a structure of protrusions and depressions stacked on an outermost portion of the laminate and buffering changes of a volume of the laminate during charge and discharge
Implementation Method 2
a solid-state rechargeable battery including a laminate including a negative electrode, a solid electrolyte layer, and a positive electrode stacked on one another
Data Source
AI summary
A solid-state rechargeable battery comprising a laminate the laminate including a negative electrode, a solid electrolyte layer, and a positive electrode stacked on one another; and an elastic sheet the elastic sheet including a structure of protrusions and depressions stacked on an outermost portion of the laminate including a negative electrode, a solid electrolyte layer, and a positive electrode stacked on one another.