All-Solid-State Battery Anode Structure for Ultrasonic Welding Adhesion
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Solution Overview
Problem
The detachment of the current collector from the anode during the ultrasonic welding process in all-solid-state battery manufacturing increases battery resistance and reduces output, as increasing the binder content to improve adhesive strength has adverse effects on battery performance.
Innovation Solution
An all-solid-state battery design with a layered structure, where the anode layer has a higher binder content in a specific region to enhance adhesive strength, preventing detachment during welding, while maintaining optimal battery performance by using a combination of first and second binders in distinct regions and maintaining the area and conductivity of the solid electrolyte and cathode layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the binder content in the anode is increased to improve adhesive strength, then the adhesive strength between the current collector and anode is improved, but the resistance of the electrode is increased and the output of the battery is reduced
Solution Approach 1:
The patent applies local quality by creating a first region near the terminal part with higher binder content (4-7 wt%) to provide strong adhesion for ultrasonic welding, while the second region has lower binder content (0.1-3 wt%) to maintain good electrical conductivity and battery output. This spatial differentiation of binder content resolves the contradiction between adhesion strength and electrical conductivity.
2Productivity
If ultrasonic welding is used to connect the anode terminal part to the anode current collector, then the connection efficiency is improved, but detachment of the current collector from the electrode occurs in the region adjacent to the terminal part
Solution Approach 1:
The patent applies preliminary action by pre-forming a first region with high binder content in the location where ultrasonic welding will occur. This preparatory structural modification ensures that when ultrasonic welding is performed, the terminal part maintains strong adhesion to the current collector without detachment, thus enabling efficient welding while preventing reliability issues.
3Strength
If the binder content is increased uniformly across the anode layer, then the adhesive strength is improved, but the electrical conductivity of the electrode is reduced
Solution Approach 1:
The patent divides the anode layer into two regions with different binder contents: the first region near the terminal part has high binder content (4-7 wt%) for strong adhesion, while the second region has low binder content (0.1-3 wt%) for good electrical conductivity. This local differentiation allows each region to optimize its function without compromising the other.
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
Prevents anode detachment during ultrasonic welding without compromising battery performance, ensuring stable adhesive strength and maintaining cell characteristics, as demonstrated by the increased binder content in specific regions and the use of suitable binders and active materials.
Implementation Method 1
an all-solid-state battery which includes a solid electrolyte for transferring ions between electrodes
Implementation Method 2
ultrasonically welding a current collector and a terminal part of an electrode
Data Source
AI summary
Disclosed is an all-solid-state battery which may prevent detachment in an anode during an ultrasonic-welding process of connecting an anode terminal part to an anode current collector.