Stacking High Power Lithium Battery with Adhesive-Attached Separators
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Solution Overview
Problem
Conventional lithium battery stacking methods often result in erroneous alignment of cathodes, separators, and anodes, leading to increased error rates and open circuit voltage drops during recharge or discharge.
Innovation Solution
A method involving the precise attachment and cutting of anodes and cathodes with adhesive materials on separators, using metal films coated with lubricants, ensures exact alignment by alternately stacking these components to form a stack cell, minimizing errors and voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional stacking methods are used to assemble lithium batteries, then the manufacturing process is simple, but the alignment precision of cathodes, separators, and anodes deteriorates leading to erroneous alignment and open circuit voltage drops
Solution Approach 1:
The separator is prepared in advance with attached anodes and cathodes at predetermined positions and intervals. This preliminary preparation ensures that when the stack cell is assembled, all components are already pre-positioned for exact alignment, eliminating alignment errors during the final stacking process.
Solution Approach 2:
The separator serves as an intermediary component that carries both the anode and cathode at predetermined positions. By attaching electrodes to the separator first, the separator acts as a carrier that ensures precise alignment when multiple layers are stacked together, solving the alignment precision problem.
2Strength
If adhesive material is applied to the entire electrode surface, then the attachment strength is maximized, but the chemical reaction area is reduced due to coverage of active sites
Solution Approach 1:
Adhesive material is applied selectively only to specific regions of the electrode where mechanical attachment is needed, rather than covering the entire surface. This local application ensures sufficient attachment strength while preserving the majority of the electrode surface area for chemical reactions.
Solution Approach 2:
The electrode surface is divided into functional zones: regions with adhesive material for attachment and regions without adhesive for chemical reactions. This segmentation allows the electrode to simultaneously fulfill both mechanical attachment and electrochemical function requirements.
Data Source
Figure 1
Figure 2(A)~2(C)
Figure 3(A)~3(C)
AI summary
The present invention relates to a process for stacking a high-power lithium battery, and the object of the present invention is to provide a process for stacking a high-power lithium battery, with lowered the error rate and minimized open circuit voltage drop of the battery. The process for stacking a high-power lithium battery according to the present invention is characterized by a process for preparing a lithium battery comprised of anodes (100), separators (300) and cathodes (200), which comprises the steps of a) providing the anode (100) attached to the separator (300); b) providing the cathode (200) attached to the separator (300); and c) alternately stacking the anodes (100) attached to the separator (300) and the cathodes (200) attached to the separator (300) to form a stack cell.