Solid Electrolyte Particle Density Gradient for Battery Thermal Management
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Solution Overview
Problem
Secondary battery electrodes with uneven minute cell formation lead to reduced energy efficiency due to areas without electric current flow and variations in temperature distribution, causing thermal stress and performance degradation.
Innovation Solution
A power storage device with a solid electrolyte layer having varying particle density, diameter, or material distribution between the positive and negative electrodes to maintain uniform temperature and current density, preventing energy efficiency reduction and thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If minute cells are formed in some areas on the collector surface but not in other areas, then thermal stress is relieved, but energy efficiency is reduced due to areas without electric current flow
Solution Approach 1:
The patent applies local quality by varying the particle density distribution within the solid electrolyte layer to create different functional zones. Specifically, the particle density is set to be lower in the central area and higher in the peripheral areas, allowing each region to have optimized properties for its specific thermal conditions while maintaining continuous current flow across the entire electrode surface.
2Temperature
If minute cells are formed with different conductive agent amounts to provide uniform temperature distribution, then temperature uniformity is improved, but device complexity increases
Solution Approach 1:
The patent employs parameter changes by modifying the particle density parameter within the solid electrolyte layer rather than changing the electrode structure into multiple discrete cells. By continuously varying the particle density from the center to the periphery, the invention achieves temperature distribution control through a gradient parameter change, avoiding the complexity of segmented cell structures while maintaining uniform thermal performance.
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 varying density and material distribution in the solid electrolyte layer ensure consistent current flow and temperature distribution, enhancing energy efficiency and reducing thermal expansion, thereby preventing performance degradation and improving overall battery performance.
Implementation Method 1
the density of particles in a first area of the solid electrolyte layer is lower than the density of particles in a second area which has higher heat radiation than the first area
Implementation Method 2
the density of particles in a first area of the solid electrolyte layer is lower than the density of particles in a second area which has higher heat radiation than the first area
Data Source
AI summary
The invention provides a power storage device capable of preventing reduced energy efficiency of the power storage device and of avoiding variations in temperature distribution. The power storage device includes a positive electrode and a negative electrode, and a solid electrolyte layer placed between the positive electrode and the negative electrode and including a group of particles, wherein the density of particles in a first area of the solid electrolyte layer is lower than the density of particles in a second area which has higher heat radiation than the first area.