Solid-State Battery Electrode Layout for Capacity and Adhesion
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Solution Overview
Problem
All solid state batteries face challenges in mechanical reliability, miniaturization, and capacity due to high interface resistance and uneven terminal electrode structures, which affect their stability and discharge speed.
Innovation Solution
The battery design includes a solid electrolyte layer with cathode and anode layers stacked between, penetration electrodes connecting the layers internally, and terminals connected to these electrodes, optimizing the margin between the cathode layer and battery edges to enhance adhesion and reduce resistance, thereby improving mechanical strength and capacity while minimizing external terminal electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cathode layer is positioned close to the battery edge to maximize capacity, then the energy density increases, but the mechanical reliability deteriorates due to insufficient adhesion margin
Solution Approach 1:
The patent optimizes the margin parameter of the cathode layer from the edge of the battery body to a specific range (15-30% of battery width). This parameter optimization ensures sufficient adhesion area between the cathode layer and solid electrolyte layer, maintaining mechanical reliability while maximizing the active material area for capacity.
2Volume of moving object
If the battery is miniaturized to reduce size, then the volume decreases, but the capacity becomes insufficient
Solution Approach 1:
The patent optimizes multiple geometric parameters including the cathode layer margin (15-30% of battery width) and lengthwise margin (5-10% of battery length). These parameter optimizations enable efficient space utilization in miniaturized batteries, ensuring sufficient adhesion areas are maintained while maximizing the active material volume for capacity.
3Reliability
If external terminal electrodes are extended to improve connectivity, then the electrical connection improves, but the device complexity increases and mounting freedom decreases
Solution Approach 1:
The patent extracts and minimizes the external terminal electrode structure by positioning terminals at the end surfaces of the battery body rather than extending them along the lateral surfaces. This extraction approach simplifies the terminal structure, reduces device complexity, and improves mounting freedom while maintaining sufficient electrical connection through the penetration electrodes.
Solution Approach 2:
Instead of extending terminal electrodes outward from the battery body to improve connectivity, the patent inverts the approach by positioning terminals at the end surfaces and relying on internal penetration electrodes for connectivity. This inversion simplifies the external structure while maintaining internal electrical connections.
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
This design enhances mechanical reliability, allows for miniaturization, and maintains low resistance, resulting in a battery with superior stability and high charge/discharge speed while securing sufficient capacity.
Implementation Method 1
a solid electrolyte layer, and a cathode layer and an anode layer stacked in the third direction with the solid electrolyte layer therebetween
Implementation Method 2
a cathode penetration electrode penetrating in the battery body and connecting the cathode layer, and an anode penetration electrode penetrating in the battery body and connecting the anode layer
Data Source
AI summary
An all solid state battery includes a battery body including first and second surfaces opposing each other in a first direction of the battery body, third and fourth surfaces opposing each other in a second direction of the battery body, and fifth and sixth surfaces opposing each other in a third direction of the battery body, a solid electrolyte layer, and a cathode layer and an anode layer stacked in the third direction with the solid electrolyte layer therebetween, a cathode penetration electrode, and an anode penetration electrode opposing the cathode penetration electrode in the second direction; a cathode terminal; and an anode terminal. An average margin of the cathode layer from an edge of the cathode layer to the third surface in the second direction is within a range of 15% or more and 30% or less of an average width of the battery body in the second direction.