Electrode Plate Rolling with Recessed Rollers to Protect Tabs
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Solution Overview
Problem
Conventional electrode plate rolling processes risk crushing tabs and insulation coating layers due to roller deflection under high pressure, leading to fracturing and wrinkling, which affects production yield and efficiency.
Innovation Solution
A rolling apparatus with recessed portions on the first roller and protruding portions on the second roller is used, ensuring that projections of the insulation coating layer and tab are within the recessed portions, reducing contact and deflection risks, and releasing redundancy to prevent wrinkling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If great pressure is applied on the roller to achieve target thickness, then the rolling thickness and compacted density are improved, but the roller deflects and the risk of crushing tabs and insulation coating layer regions increases
Solution Approach 1:
The roller surface is designed with different local properties: recessed portions are created at locations corresponding to tabs and insulation coating layer regions, while other areas maintain normal rolling surface characteristics. This allows the roller to apply great pressure for achieving target thickness while locally protecting sensitive areas from crushing by providing recessed spaces that accommodate these features without direct contact.
2Object-affected harmful factors
If the depth of the recessed portion is increased to better protect the tab, then the tab protection is improved, but the degree of deflection increases and the side wall of the recessed portion may contact the tab
Solution Approach 1:
The depth of the recessed portion is optimized to a specific parameter range (50-150 micrometers) to balance two competing requirements: deep enough to provide adequate protection by accommodating the tab and insulation coating layer, but not so deep as to cause excessive roller deflection that would bring the side wall into contact with the tab. This precise parameter control resolves the contradiction between protection effectiveness and deflection control.
Data Source
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AI summary
This application relates to a rolling apparatus and a processing device, which are used for rolling an electrode plate (1). The rolling apparatus includes a first roller (2) and a second roller (3), where the first roller (2) and the second roller (3) are disposed at two sides of the electrode plate in a thickness direction of the electrode plate. The first roller (2) is provided with a plurality of recessed portions (21), the electrode plate (1) includes a plurality of insulation coating layer regions (11) and a plurality of tabs (12), and in a projection of the electrode plate (1) in the thickness direction, at least part of a projection of the insulation coating layer region (11) and a projection of the tab (12) are located within a projection of the recessed portion (21). The rollers deflect under a large rolling pressure. The recessed portion (21) provides a gap for the tab (12) when the first roller (2) deflects, reducing the probability of the first roller (2) coming into contact with the tab (12), lowering the risk of crushing the tab (12), and reducing fractures in the subsequent processes of stretching and ultrasonic welding.