Electrode Tab Adhesive Tape With Local Thickness for Short-Circuit Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion battery tabs are prone to short-circuiting due to inadequate protection of their end faces by insulating layers, leading to safety risks during charging and discharging processes.
Innovation Solution
An adhesive tape with a specific adhesive layer structure, featuring a thick region and a thin region, is applied to the edges of the tabs to prevent contact with the battery cell body, ensuring secure bonding and preventing short-circuits, while through holes reduce tensile strength to accommodate housing placement without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick adhesive layer is used to ensure strong bonding, then the adhesive tape bonds firmly to the tab, but the top cover interference increases when the battery cell is placed in the housing
Solution Approach 1:
The adhesive layer is designed with non-uniform thickness, featuring a thick region and a thin region. The thick region provides strong bonding strength to ensure the adhesive tape firmly attaches to the tab, while the thin region minimizes the profile height to prevent interference with the top cover during housing placement. This local quality variation allows the single adhesive layer to simultaneously satisfy both bonding strength and ease of operation requirements.
2Reliability
If the adhesive tape wraps tightly around the tab to prevent contact with the battery cell body, then safety performance improves, but the top cover may be interfered with during housing placement
Solution Approach 1:
The adhesive tape structure incorporates localized thickness variation with a thick region for strong bonding and a thin region for reduced profile. This allows the tape to wrap tightly around the tab body to ensure safety performance while the thin region minimizes the overall height to prevent top cover interference during housing placement, thereby resolving the contradiction between safety and ease of operation.
3Ease of operation
If through holes are added to the adhesive tape, then the tensile strength is reduced to accommodate housing placement, but the bonding capability may be compromised
Solution Approach 1:
The adhesive layer is designed with a thick region that provides sufficient bonding capability to ensure the adhesive tape firmly attaches to the tab. The thin region, which may contain through holes, reduces the overall tensile strength to accommodate housing placement. By concentrating the bonding function in the thick region, the structure maintains adequate bonding capability while allowing the thin region to facilitate ease of operation during housing placement.
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 adhesive tape effectively enhances the safety performance of lithium-ion batteries by preventing tab-cell contact and ensuring smooth battery cell housing, significantly reducing short-circuit failure ratios and improving manufacturing convenience.
Implementation Method 1
an adhesive layer... is coated on one side of the base-material layer... the adhesive layer includes a thick region and a thin region
Data Source
AI summary
Disclosed is an adhesive tape for an electrode tab, which includes a base-material layer and an adhesive layer. The adhesive layer includes a thick region and a thin region which extend from a side edge of the adhesive tape in a width direction of the adhesive layer, the thick region is distributed along the side edge of the adhesive tape, and an adhesive layer thickness of the thick region is greater than an adhesive layer thickness of the thin region. A ratio of an area of the thin region to an area of the thick region is 1:0.02-0.25, optionally 1:0.025-0.18, and further optionally 1:0.0275-0.125. The adhesive tape covers an edge of the tab to fundamentally prevent contact between the tab and a battery cell body.