Secondary Battery Electrode Mold Prevents Slurry Cracking
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Solution Overview
Problem
Conventional secondary battery electrode manufacturing devices face limitations in applying a large amount of electrode mixture slurry without cracking and ensuring strong adhesion to the current collector, leading to structural instability and increased defect rates.
Innovation Solution
A secondary battery electrode manufacturing device with an electrode mixture layer forming mold that injects and dries the slurry, forming a sheet which is then attached to a cut current collector, enhancing adhesion and stability while preventing cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large amount of electrode mixture slurry is applied to the current collector, then the electrode capacity increases, but the slurry cracks during drying and pressing
Solution Approach 1:
The electrode mixture layer is divided into multiple separate layers, each applied and dried independently before being stacked together. This segmentation allows each layer to be formed with optimal thickness without excessive drying stress, preventing cracks while maintaining high total slurry quantity for increased electrode capacity.
2Ease of manufacture
If electrode mixture slurry is directly coated on current collector, then the manufacturing process is simple, but the adhesion between electrode mixture layer and current collector is weak
Solution Approach 1:
A separate electrode mixture layer sheet is formed as an intermediary component before being attached to the current collector. This intermediate layer provides a larger bonding surface area and improved adhesion strength compared to direct coating, while the overall process remains manufacturable through standardized sheet formation and attachment steps.
3Length of moving object
If thin electrode sheets are used to meet product requirements, then the battery can be applied to mobile phones, but the electrode capacity is limited
Solution Approach 1:
Instead of increasing thickness in the vertical dimension, multiple thin electrode layers are stacked in the vertical direction to achieve high total capacity. Each layer remains thin for flexibility and product application, while the stacked configuration accumulates sufficient active material quantity for high electrode capacity.
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 allows for easier application of a large amount of electrode mixture slurry, improving structural stability and reducing defect rates by increasing adhesion and preventing cracking.
Implementation Method 1
a drying unit for drying the electrode mixture slurry injected into the hollow region of the electrode mixture layer forming mold
Data Source
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AI summary
Disclosed herein is a secondary battery electrode manufacturing device including a slurry supply unit for supplying a secondary battery electrode mixture slurry, an electrode mixture layer forming mold configured to have a hollow structure having a first open surface and a second open surface, the first open surface and the second open surface being opposite each other, the electrode mixture slurry supplied from the slurry supply unit being injected into a hollow region of the electrode mixture layer forming mold, a drying unit for drying the electrode mixture slurry injected into the hollow region of the electrode mixture layer forming mold, a press for pressing the dried electrode mixture slurry to form an electrode mixture layer sheet, and a mold support unit for supporting the electrode mixture layer forming mold in the state in which the top surface of the mold support unit faces the first open surface of the electrode mixture layer forming mold.