Inline Lithium Foil Notching and Stacking Without Adhesion
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Solution Overview
Problem
The use of lithium metal as an anode material in batteries results in stickiness issues, leading to decreased productivity due to adhesion and storage challenges, which existing technologies fail to adequately address.
Innovation Solution
An in-line manufacturing apparatus that combines a notching process with a stacking process, using a laser cutter and a slitter to form anode plates directly, eliminating the need for magazine storage and incorporating a lithium foil tape unwinder with a release film to prevent adhesion, and a vision inspection system to ensure quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as anode material, then energy density is increased to more than 1000 Wh/L, but stickiness causes adhesion to mold and foreign substances, decreasing productivity
Solution Approach 1:
A release film is introduced as an intermediary between the lithium metal anode and the mold during the notching process. This release film prevents direct contact between the sticky lithium metal and the mold surface, eliminating adhesion problems while maintaining the high energy density benefits of lithium metal anodes.
Solution Approach 2:
The patent replaces mechanical pressing methods with laser-based notching for the anode processing. This substitution eliminates the need for physical contact between the lithium metal and mechanical presses or molds, thereby preventing adhesion issues while enabling continuous high-speed production.
2Loss of time
If magazine storage is used after notching, then anode plates can be stored, but lithium metal sticks to each other under pressure due to its own weight
Solution Approach 1:
The patent extracts and eliminates the magazine storage step from the manufacturing process. By implementing an in-line continuous manufacturing system where the anode is processed and assembled without intermediate storage, the problem of lithium metal adhesion under storage pressure is completely avoided, while maintaining efficient production through continuous operation.
Solution Approach 2:
The manufacturing process is designed as a continuous in-line operation where the anode is immediately processed and assembled after notching, without interruption for storage. This continuous flow eliminates the need for magazine storage and prevents adhesion problems while maximizing productivity through uninterrupted manufacturing.
3Ease of manufacture
If press apparatus with sharp press blade is used for notching, then cutting is direct and simple, but periodic blade replacement and maintenance are required
Solution Approach 1:
The patent replaces the mechanical press blade system with a laser-based notching system. This substitution eliminates the need for physical blades that require replacement and maintenance, while providing precise, clean cuts without contact with the lithium metal, thereby eliminating maintenance downtime and improving manufacturing efficiency.
4Productivity
If laser apparatus is used for notching, then production speed is fast and no additional maintenance cost, but initial investment cost is high
Solution Approach 1:
The patent integrates the laser notching system with the subsequent stacking and assembly processes in a unified in-line manufacturing apparatus. By merging multiple functions (notching, stacking, assembly) into a single integrated system, the high initial investment is justified through eliminated intermediate steps, reduced labor costs, and continuous high-speed production that maximizes the return on the advanced laser technology.
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 approach enhances productivity by preventing adhesion during the assembly process, allowing continuous operation without magazine storage, thus improving manufacturing efficiency.
Implementation Method 1
a notching part processing the lithium foil tape to form an anode plate having an electrode tab
Data Source
AI summary
An in-line manufacturing apparatus for a lithium metal battery comprises: a lithium foil tape unwinder peeling a release film on the lithium foil tape and transferring the lithium foil tape peeled off the release film to a notching part; the notching part forming an anode plate having an electrode tab by processing the lithium foil tape; and a stacking part inserting a separator film between the anode plate and a cathode plate directly transferred from the notching part in a zigzag manner to alternately stack the separator film.