Identifiable Substrate Coating with Surface Tension and Ink Load Control
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Solution Overview
Problem
Existing methods for forming marking codes on lithium battery substrates using engraving, spraying, or printing result in low engraving efficiency, high production costs, and insufficient adhesive force, posing safety risks due to unqualified batteries entering the market.
Innovation Solution
An identifiable substrate with a base film and marking layer, where the surface tension of the base film and marking layer are optimized to ensure a specific thickness ratio, combined with a corona treatment and a scraper-applying process to form a stable adhesive layer, enhancing the structural stability and adhesion of the marking layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If engraving process is adopted to form marking code on substrate surface, then marking code can be formed, but engraving efficiency is low, production equipment cost is high, and multi-color engraving code is difficult to achieve
Solution Approach 1:
The patent replaces the mechanical engraving process with a printing process using a printing head that deposits material to form marking codes. This substitution eliminates the need for complex mechanical engraving equipment while achieving high-speed code formation, directly resolving the contradiction between low engraving efficiency and high equipment cost.
Solution Approach 2:
The patent changes the fundamental parameter of code formation from mechanical removal (engraving) to material deposition (printing). By controlling the deposition parameters of the printing head, the system achieves high-speed, low-cost multi-color code formation, transforming the process entirely to resolve the efficiency and cost contradiction.
2Productivity
If spraying or printing process is adopted to form marking code on substrate surface, then engraving efficiency improves, but adhesive force of ink coating is insufficient
Solution Approach 1:
The patent applies a preliminary treatment to the substrate surface before printing the marking code. This preliminary action modifies the surface properties to enhance subsequent ink coating adhesion, ensuring that when the printing process forms the code, the ink bonds strongly to the substrate, resolving the contradiction between high productivity and sufficient adhesive force.
Solution Approach 2:
The patent introduces an intermediary layer or surface treatment between the substrate and the ink coating. This intermediary enhances the interfacial adhesion by improving surface energy or creating chemical bonding sites, allowing the printing process to achieve both high efficiency and strong adhesive force simultaneously.
3Strength
If ink coating is applied to substrate surface to form marking code, then marking code can be formed with good adhesion, but ink load on substrate surface exceeds threshold value causing marking layer to fall off
Solution Approach 1:
The patent incorporates feedback control in the printing process to monitor and adjust ink deposition in real-time. By sensing the ink load on the substrate surface and adjusting the printing parameters accordingly, the system prevents excessive ink accumulation that would cause the marking layer to fall off, while maintaining sufficient adhesion, thus resolving the contradiction between good adhesion and precise ink load control.
Solution Approach 2:
The patent makes the ink deposition process dynamic and adjustable rather than static. The printing system can dynamically vary ink load, deposition speed, and pattern based on substrate conditions, allowing optimal ink loading that ensures adhesion without exceeding the threshold that would cause layer separation.
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 provides a stable and efficient process for forming marking codes with improved adhesion, reducing production costs and ensuring the marking layer remains intact, facilitating effective traceability and safety management of lithium batteries.
Implementation Method 1
the identifying surface is subjected to a corona treatment
Implementation Method 2
a surface tension of the identifying surface is D1; a surface tension of the marking layer is D2
Implementation Method 3
the marking layer is laminated with the identifying surface of the base film
Data Source
AI summary
Provided in the present application is an identifiable substrate, including a base film and a marking layer, the base film including an identifying surface, the marking layer is an ink coating, in which the marking layer is laminated with the identifying surface of the base film; a surface tension of the identifying surface is D1; a surface tension of the marking layer is D2; and a thickness of the marking layer H satisfies 0.8 μm≤H≤(D1/D2)×5 μm. In the present solution, the relative surface tension of the base film and the marking layer reflects the surface effect of the lamination between the base film and the marking layer. A thickness range of the marking layer is determined based thereon, so that the ink load on the surface of the base film is effectively controlled within the threshold value of the base film.