Adhesive Paper for Lithium-Ion Cell Edge Thinning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries with multi-tabs winding and lamination structures experience thinning at the edges of electrode sheets, leading to poor bonding and deformation during hot-pressing formation due to uneven thickness, which affects their performance and reliability.
Innovation Solution
Attaching adhesive paper with specific thickness and angle variations to compensate for the thin areas at the end portions of the lithium-ion cell body, ensuring uniform surface pressure and bonding during hot-pressing, and improving electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multi-tabs winding and lamination structure with zebra coating is used to achieve high power density, then rate capability is improved, but thinning at edges of electrode sheets causes poor bonding and deformation during hot-pressing formation
Solution Approach 1:
The patent applies different properties to different parts of the cell by attaching adhesive paper specifically to the thin area at the end portion of the cell body. This local intervention compensates for the thickness deficiency only where needed (at the thin area) without affecting other regions, thereby resolving the bonding quality issue at the edge while preserving the high power density benefits of the multi-tabs structure throughout the cell.
2Power
If zebra coating is applied to electrode sheets for high-power applications, then power density is improved, but edge thinning occurs leading to deformation during hot-pressing formation
Solution Approach 1:
The adhesive paper is attached to the thin area of the cell body before the hot-pressing formation process. This preliminary action compensates for the thickness deficiency in advance, ensuring that when hot-pressing occurs, the end portion has sufficient thickness to maintain proper shape and avoid deformation, while the zebra coating structure remains intact for high power density.
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 use of adhesive paper with controlled thickness and angle variations addresses the thinning issue, resulting in improved bonding, reduced deformation, and enhanced safety and performance of lithium-ion batteries, particularly in high-power applications.
Implementation Method 1
the adhesive paper is an adhesive paper whose thickness increases in the direction from the middle portion of the cell body to an end surface of the cell body
Implementation Method 2
the adhesive paper includes a substrate layer and an adhesive layer, and the substrate layer has an outer plane and an inner inclined plane having an included angle α relative to the outer plane, and the adhesive layer is disposed on the inner inclined plane
Data Source
AI summary
The application discloses a lithium-ion cell, a battery and a power device, which belongs to the technical field of lithium-ion battery structure. A side surface of an end portion of a cell body of the lithium-ion cell has a thin area relative to a middle portion of the cell body, and the lithium-ion cell further includes adhesive paper attached to the thin area. In this application, a special adhesive paper is designed and attached to the thin area formed due to thinning processing at the edge of the end portion of the lithium-ion cell body, and is suitable for compensating for the thin area of the lithium-ion cell, so that the cell has a flat surface, is stressed uniformly during hot-pressing formation and has a good bonding.