Laminated Electrode Roller Pressing With Metal Plate Pressure Buffer
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Solution Overview
Problem
The existing methods for producing laminated electrode bodies in batteries, such as lithium ion secondary batteries, result in damage to the ridge portions of positive electrode plates and separators due to excessive pressure during roller-pressing, leading to reduced reliability and performance of the battery.
Innovation Solution
A laminated body pressing apparatus and method that uses a metal plate, such as a copper, nickel, or aluminum plate, interposed between the positive electrode plates and the negative electrode body during roller-pressing to distribute pressure more evenly, reducing damage to the ridge portions and separators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If roller-pressing is performed directly on the positive electrode plates and negative electrode body, then pressing force is applied effectively, but the ridge portions of positive electrode plates and separators are damaged
Solution Approach 1:
A metal plate is introduced as an intermediary between the press roller and the positive electrode plates. The metal plate has a larger contact area than the positive electrode plates, which distributes the pressing force more evenly and prevents concentration of stress at the ridge portions. This intermediary layer transmits the pressing force while protecting the electrode structure from direct mechanical damage.
Solution Approach 2:
The metal plate is designed with specific local properties - it is rigid enough to distribute force evenly across the contact area, yet flexible enough to conform to the electrode structure. The plate's material and thickness are optimized to provide local support exactly where needed - at the ridge portions and separator areas - without over-compressing other regions.
2Strength
If large pressure is applied during roller-pressing to ensure good contact, then adhesion between layers is improved, but the first separator is damaged
Solution Approach 1:
The metal plate serves as a protective intermediary between the press roller and the first separator. By distributing the pressing force across its larger surface area, the plate reduces the pressure intensity at any single point, particularly at the separator location. This allows sufficient pressing force to be applied for good adhesion while preventing the separator from being crushed or torn.
Solution Approach 2:
The metal plate is positioned in advance before the pressing operation to provide pre-cushioning protection. It is fed into the pressing area and positioned between the roller and the electrode assembly, creating a protective barrier that cushions the separator and ridge portions before the full pressing force is applied.
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 damage to the ridge portions of positive electrode plates and separators, enhancing the reliability and adhesiveness of the laminated electrode body, thereby improving the quality of the battery.
Implementation Method 1
uses a metal plate, such as a copper, nickel, or aluminum plate, interposed between the positive electrode plates and the negative electrode body during roller-pressing to distribute pressure more evenly
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.