Conveying Roller Structure to Prevent Cell Pole Tab Bending
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Solution Overview
Problem
The rapid increase in lithium battery production efficiency leads to issues such as bending and turning outward of cell pole tabs during the winding process, compromising the quality and safety of the finished cell.
Innovation Solution
A conveying roller with a central axis, transmission portion, and avoidance position is designed to apply a transmission friction force while avoiding the transition area and pole tabs, reducing centrifugal force effects and preventing bending, using a mandrel and rotating cylinders with specific radius differences and rounded transition structures to ensure smooth passage and prevent stress on uneven edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the winding speed of the winder is increased to improve production efficiency, then the production efficiency of the cell is improved, but the pole tabs bend and turn outward compromising quality
Solution Approach 1:
The conveying roller is divided into two distinct functional regions: a transmission portion that contacts the bearing area to drive the pole piece, and an avoidance position that deliberately excludes the transition area and pole tabs from contact. This segmentation allows the pole piece body to be conveyed at high speed while the vulnerable pole tabs remain untouched, resolving the contradiction between speed and quality
Solution Approach 2:
Different regions of the conveying roller are assigned different functions: the transmission portion provides friction-driven motion to the bearing area, while the avoidance position provides a clear path for the pole tabs. This local differentiation ensures that high-speed conveying does not compromise pole tab integrity, as each region is optimized for its specific purpose
2Productivity
If the winding speed is increased to improve production efficiency, then the production efficiency is improved, but the pole tabs turn outward and bend reducing reliability
Solution Approach 1:
The vulnerable pole tabs are effectively extracted from the contact zone by designing the avoidance position that excludes them from the transmission portion. This extraction prevents the pole tabs from being subjected to centrifugal forces and friction during high-speed conveying, maintaining their straight configuration and ensuring reliability of the finished cell
Solution Approach 2:
The solution introduces a spatial dimension to the conveying process by creating a three-dimensional arrangement where the transmission portion contacts only the bearing area while the avoidance position provides a clear path above or beside it for the pole tabs. This dimensional separation allows simultaneous high-speed conveying and pole tab protection
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 the possibility of pole tabs turning outward and bending, enhancing the quality and yield of the cell by minimizing centrifugal force impact and preventing insulating film punctures, thus improving the production efficiency and safety of the lithium battery cells.
Implementation Method 1
the bearing area is contactable with the transmission portion, so that the transmission portion applies a transmission friction force to the cell pole piece
Data Source
AI summary
The present disclosure relates to a conveying roller for conveying a cell pole piece, the cell pole piece comprising a main body and pole tabs, the main body comprising a bearing area and a transition area, each of the pole tabs comprising a root portion connected to the transition area, a middle section and a top portion, and the conveying roller comprising: a central axis, a first end face and a second end face disposed opposite to each other along the central axis, a transmission portion and an avoidance position provided between the first end face and the second end face, wherein the transmission portion is rotatable around the central axis, the bearing area is contactable with the transmission portion, so that the transmission portion applies a transmission friction force to the cell pole piece, and the avoidance position is capable of avoiding the transition area and the pole tabs.