Rotary Electrode Stacking for Precise Lithium Battery Lamination
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Solution Overview
Problem
There is a need for improved methods and apparatuses to enhance the manufacturing process of rechargeable lithium batteries, particularly in stacking electrodes to achieve higher energy density and capacity.
Innovation Solution
An electrode stacking apparatus is used to sequentially stack positive and negative electrodes with a separator, employing a rotary unit and ejection units to align and fix electrode substrates and mixtures, resulting in a rechargeable lithium battery with a specific separator design that includes a buried and protruding part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional electrode stacking methods are used, then the manufacturing process is simpler, but the energy density and capacity of the battery are lower
Solution Approach 1:
The electrode stacking process is divided into multiple sequential steps using a rotary unit with multiple ejection units. Each ejection unit (first through fifth) independently places specific electrode components (positive electrode current collector, positive electrode active material layer, separator, negative electrode active material layer, negative electrode current collector) onto the stacking table in a predetermined sequence, enabling precise control over electrode assembly structure to achieve higher energy density
Solution Approach 2:
The rotary unit pre-positions multiple ejection units at different angular positions before the stacking operation begins. This preliminary arrangement allows all electrode components to be sequentially placed in one continuous rotational cycle, improving manufacturing efficiency while maintaining the complex multi-layer structure required for high capacity batteries
2Quantity of substance
If sequential stacking of multiple electrode components is performed, then the battery achieves higher capacity, but the alignment precision requirements increase
Solution Approach 1:
The separator acts as an intermediary component between the positive and negative electrode active material layers. By placing the separator on the stacking table first and then positioning the electrode mixtures on either side, the system establishes fixed reference positions that guide the alignment of subsequent electrode components, ensuring precise positioning throughout the stacking process
Solution Approach 2:
The rotary unit replaces complex mechanical positioning systems with a rotational indexing mechanism. Each ejection unit is positioned at a specific angular location on the rotary unit, and the rotation brings each unit to the stacking position in sequence. This substitution simplifies the control of alignment precision while maintaining the ability to place multiple electrode components with high accuracy
Data Source
AI summary
An electrode stacking apparatus includes a stacking table and a sheet supply unit that includes a rotary unit and first to fifth ejection units. The rotary unit is configured to rotate and concurrently to sequentially place the first to fifth ejection units on the stacking table. The first ejection unit is configured to eject a first electrode substrate. The second ejection unit is configured to eject a first electrode mixture. The third ejection unit is configured to eject a separator. The fourth ejection unit is configured to eject a second electrode mixture. The fifth ejection unit is configured to eject a second electrode substrate.