Zigzag Electrode Stacking with In-Process Separator Sealing
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Solution Overview
Problem
In the zigzag stacking process of secondary battery electrodes, the positive electrode plate tends to move relative to the separator, leading to misalignment and defects in the stacked electrode assembly due to sliding during the stacking process.
Innovation Solution
A zigzag stacking device with a vertically movable stack table, a swing roll for supplying the separator in a zigzag shape, a sealer for pressing and sealing the separator on the stack table, and a controller to control the operation of the stack table and sealer, ensuring the separator is sealed whenever it is stacked on the positive electrode plate, preventing movement and misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the separator is stacked on the positive electrode plate during zigzag stacking, then the electrode assembly is formed, but the positive electrode plate moves relative to the separator causing misalignment
Solution Approach 1:
The patent applies preliminary action by performing sealing of the separator to the positive electrode plate at the moment of stacking, before any misalignment can occur. The sealing unit seals the separator and positive electrode plate together whenever the separator is stacked on the positive electrode plate, preventing subsequent movement and maintaining precise alignment throughout the stacking process.
2Productivity
If the stacking process continues without sealing, then productivity is maintained, but electrode movement and misalignment occur
Solution Approach 1:
The patent merges the stacking process with the sealing process into a single integrated operation. The sealing unit is configured to seal the separator and positive electrode plate together at the moment of stacking, combining two previously separate operations (stacking then sealing) into one simultaneous action. This eliminates the time delay between stacking and sealing, maintaining high productivity while ensuring precise alignment is locked in place.
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
The solution effectively prevents electrode movement and misalignment during the stacking process, enhancing the quality of the stacked electrode assembly by ensuring precise alignment and bonding of the separator with the positive electrode plate.
Implementation Method 1
a sealer for pressing and sealing the separator on the stack table
Data Source
AI summary
A zigzag stacking device includes a stack table, swing roll, oppositely disposed positive and negative electrode unwinders, sealer, and controller. Positive and negative electrode plates and a separator are stacked on the stack table. The swing roll supplies the separator in a zigzag shape to the stack table by horizontal movement. The positive electrode unwinder supplies the positive electrode plate to a folded section of the separator folded in a zigzag shape. The negative electrode unwinder alternately supplies the negative electrode plate to a folded section adjacent to the folded section of the separator to which the positive electrode plate is supplied. The sealer presses and seals the separator when the separator is on the stack table. The controller controls operations of the stack table and sealer to seal the separator whenever the separator is stacked on the positive electrode plate and over the stack table.