Laminated Electrode Pressing with Metal Plate Ridge Protection
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Solution Overview
Problem
During the roller-pressing process for producing laminated electrode bodies, the ridge portions of positive electrode plates and the separators can be damaged due to excessive pressure, leading to material loss and separator tears.
Innovation Solution
A laminated body pressing apparatus that incorporates a metal plate feeding unit to interpose a strip-shaped metal plate between the positive electrode plates and the negative electrode body, reducing pressure on the ridge portions and preventing damage by distributing the pressure over a wider area, and utilizing an annular endless metal plate with controlled thickness to enhance adhesiveness and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If roller-pressing is performed to press-contact positive electrode plates and negative electrode body, then adhesiveness between electrode plates and negative electrode body is improved, but ridge portions of positive electrode plates and separators are damaged due to excessive pressure
Solution Approach 1:
A strip-shaped metal plate is introduced as an intermediary component between the positive electrode plates and the press rollers. This metal plate distributes the pressing force across a wider area, preventing excessive pressure concentration on the ridge portions of positive electrode plates and the separators, while still achieving sufficient press-contact for adhesiveness.
Solution Approach 2:
The thickness of the strip-shaped metal plate is controlled within a specific range (3-8 times the thickness of the positive electrode plate) to optimize the pressure distribution. By adjusting this parameter, the pressing force is effectively dispersed, reducing damage to sensitive components while maintaining adequate bonding strength.
2Strength
If large pressure is applied during roller-pressing to ensure adequate contact, then adhesiveness is improved, but the first separator is damaged at contact portions with positive electrode plates
Solution Approach 1:
The strip-shaped metal plate serves as a protective intermediary that positions the positive electrode plates away from direct contact with the first separator. This intermediary layer distributes the pressing force and prevents the positive electrode plate ridge portions from pressing into and damaging the separator.
Solution Approach 2:
The strip-shaped metal plate is placed in advance before roller-pressing to provide cushioning protection. It absorbs and distributes the pressing force before it reaches the positive electrode plates and separators, preventing damage before it occurs.
3Ease of manufacture
If conventional roller-pressing is performed without additional protective measures, then manufacturing process is simple, but ridge portions and separators suffer from pressure damage
Solution Approach 1:
The strip-shaped metal plate is a simple intermediary component that can be easily integrated into the existing roller-pressing process. It provides effective protection against pressure damage while maintaining the simplicity of the manufacturing process, as it only requires feeding the metal plate through the pressing area.
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 reduces damage to the ridge portions of the positive electrode plates and separators, ensuring a reliable laminated electrode body production with improved adhesiveness between the electrode plates and the negative electrode body, resulting in a more durable battery.
Implementation Method 1
reducing pressure on the ridge portions and preventing damage by distributing the pressure over a wider area
Implementation Method 2
roller-pressing the positive electrode plates and the negative electrode body
Data Source
AI summary
A laminated body pressing apparatus, which can restrain damage of a first outer ridge portion or a second outer ridge portion of a positive electrode plate during roller-pressing and can restrain damage of a strip-shaped first separator of a strip-shaped negative electrode body on a positive electrode plate side, includes a first press roller, a second press roller disposed parallel to the first press roller and spaced apart from the first press roller by a roller gap, and a metal plate feeding unit to feed a strip-shaped metal plate extending in a conveyance direction to the roller gap. The apparatus roller-presses the positive electrode plate and the strip-shaped negative electrode body by the first press roller and the second press roller in a state where the strip-shaped metal plate fed by the metal plate feeding unit is placed on the positive electrode plate placed on the strip-shaped negative electrode body.