Elliptical Segmented Mandrel for Battery Electrode Rolling
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Solution Overview
Problem
Existing rolling devices for secondary batteries face challenges in preventing internal shorts and ensuring the quality of electrode assemblies, particularly due to the risk of deformation and the end-part slip phenomenon during the rolling process.
Innovation Solution
A rolling device with a mandrel featuring an elliptical blade divided into four sections and coupled with rotating bodies, which allows for precise rolling and fixation of electrode plates and separators, minimizing deformation and preventing the end-part slip phenomenon by increasing the horizontal and vertical distances of the mandrel structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional rolling device is used to roll electrode plates and separators, then the rolling process can be completed, but deformation and creasing occur during rolling, reducing manufacturing precision
Solution Approach 1:
The blade is divided into four distinct sections (first blade section, second blade section, third blade section, fourth blade section) that can rotate independently. This segmentation allows each section to be optimized for specific rolling functions and enables independent adjustment to prevent deformation and creasing during the rolling process, thereby improving manufacturing precision while maintaining electrode assembly quality.
Solution Approach 2:
The blade sections are configured to rotate relative to each other around the mandrel axis, creating dynamic rolling action. The rotating blade sections adapt to the electrode assembly during rolling, distributing pressure more evenly and preventing static deformation and creasing, thus improving both rolling precision and electrode assembly quality stability.
2Device complexity
If the mandrel structure is simplified, then device complexity is reduced, but the end-part slip phenomenon occurs during rolling
Solution Approach 1:
The blade is segmented into four rotating sections that can independently adjust their positions. This segmentation provides multiple contact points with the electrode assembly, increasing friction and preventing end-part slip without requiring complex additional constraint mechanisms, thus maintaining acceptable device complexity while improving rolling stability.
Solution Approach 2:
The rotating blade sections act as intermediaries between the mandrel and the electrode assembly. They provide enhanced grip and control during rolling through their rotational motion and segmented structure, preventing end-part slip while maintaining a relatively simple overall mandrel design.
3Device complexity
If the blade is not divided into sections, then device complexity is reduced, but internal shorts may occur due to improper rolling
Solution Approach 1:
Dividing the blade into four sections allows each section to be independently positioned and adjusted to apply uniform rolling pressure across the electrode assembly. This prevents localized deformation and improper rolling that could cause internal shorts, while the segmented structure itself remains relatively simple to manufacture and maintain.
Solution Approach 2:
Each blade section can be independently adjusted to provide locally optimized rolling pressure and contact with different parts of the electrode assembly. This local quality control ensures uniform rolling without deformation or creasing that could lead to internal shorts, while maintaining overall blade structure simplicity.
Data Source
AI summary
A rolling device for a secondary battery includes a mandrel to roll a first electrode plate, a second electrode plate, and a separator interposed between the first electrode plate and the second electrode plate, the mandrel having a pair of clamps at a center of the mandrel, a blade surrounding the clamps while being spaced apart from the clamps, the blade having an elliptical cross-section and being divided into four sections, the first electrode plate, second electrode plate, and separator being rolled on the blade, and a rotating body coupled to an interior side of the blade, the rotating body being between the clamps and the blade.