All-Solid-State Battery Unit Cell Assembly With One-Sided Terminal Layout
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Solution Overview
Problem
The formation of high-quality interfaces between electrodes and electrolytes in all-solid-state batteries is challenging, particularly when using single-sided negative electrodes, which can lead to increased material usage, terminal count, and degraded welding performance, complicating the manufacturing process.
Innovation Solution
The use of single-sided negative electrodes with and without terminals, where one electrode has no terminal, and an insulating tape is applied to secure the positive electrode, simplifying the manufacturing process and reducing terminal count, and employing a method involving continuous negative electrode sheets and insulating tape to streamline the assembly and pressing of unit cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If single-sided negative electrodes are used to form interfaces between unit cells, then interface quality is improved, but the number of negative electrode terminals increases and welding performance deteriorates
Solution Approach 1:
The patent extracts the terminal function from one of the single-sided negative electrodes. Specifically, one negative electrode is designed without a terminal, separating the terminal provision function to only one electrode, thereby reducing the total terminal count while maintaining the interface-forming capability between unit cells
Solution Approach 2:
The single-sided negative electrode without terminal serves multiple purposes: it forms the interface between unit cells and eliminates the need for a terminal on that side. This multi-functional design reduces overall device complexity while preserving the necessary electrical connection pathways through the remaining terminalized electrode
2Manufacturing precision
If single-sided negative electrodes are used to secure interfaces between unit cells, then interface formation is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the negative electrode functionality into two types: one with terminal and one without terminal. This segmentation allows the non-terminal electrode to be optimized purely for interface formation, simplifying its structure and manufacturing, while the terminalized electrode handles electrical connection requirements
Solution Approach 2:
Instead of giving both single-sided negative electrodes terminals (conventional approach), the patent inverts the approach by giving only one electrode a terminal, turning the previously problematic feature (terminal presence) into a selective design choice that simplifies manufacturing
3Reliability
If multiple negative electrode terminals are used in unit cells, then electrical connections are secured, but welding performance is degraded
Solution Approach 1:
The patent extracts the terminal function from one negative electrode, reducing the total number of terminals that require welding operations. This extraction maintains necessary electrical connections through the remaining terminalized electrode while eliminating excessive welding points that degrade overall welding performance
Data Source
AI summary
Disclosed are an all-solid-state battery and a method of manufacturing the same. A unit cell of the all-solid-state battery includes a positive electrode, and single-sided negative electrodes configured to be stacked on a first surface and a second surface of the positive electrode, wherein, among the single-sided negative electrodes, a first single-sided negative electrode includes no negative electrode terminal, and a second single-sided negative electrode includes a negative electrode terminal.