Lead Tab Laser Patterning for Sealant Film Adhesion
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Solution Overview
Problem
The existing manufacturing processes for lead tabs in secondary batteries face challenges in achieving secure adhesion between the lead tab and the sealant film, leading to potential defects and reduced productivity.
Innovation Solution
An apparatus and method utilizing a laser for surface treatment of lead tabs with high positional precision, combined with oxidation film formation and precise adhesive application, to enhance adhesion with the sealant film and prevent corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing processes are used for lead tabs, then manufacturing simplicity is maintained, but adhesion between the lead tab and sealant film is insufficient leading to defects
Solution Approach 1:
The patent applies preliminary action by performing laser surface treatment and oxidation film formation on the lead tab before the sealant film is applied. This preparatory surface modification creates optimal adhesion conditions in advance, ensuring reliable bonding between the lead tab and sealant film while preventing subsequent corrosion issues.
Solution Approach 2:
The patent replaces conventional mechanical surface treatment methods with laser-based surface treatment. The laser irradiation provides precise, controlled surface modification that enhances adhesion properties more effectively than traditional mechanical methods, while the oxidation film formation through controlled heating further improves chemical bonding with the sealant film.
2Strength
If laser surface treatment is applied to improve adhesion, then adhesion strength increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs self-service by using the lead tab itself as the marking target for the laser processing. The processing pattern is directly formed on the lead tab surface, utilizing the material's own properties for pattern recognition and treatment. This approach simplifies the overall system while maintaining high positional precision, as the lead tab's characteristics are used to guide and define the treatment areas.
3Reliability
If oxidation film formation is performed to prevent corrosion, then corrosion resistance improves, but additional processing steps are required
Solution Approach 1:
The patent merges the oxidation film formation process with the existing heating steps in the manufacturing process. By integrating the oxidation treatment into the heating sequence already required for other processing steps, the patent achieves corrosion protection without adding significant process time or complexity, thereby maintaining high manufacturing productivity.
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 achieves stable adhesion between the lead tab and the sealant film, even when in contact with electrolytes, thereby reducing defects and improving manufacturing productivity.
Implementation Method 1
a marking portion configured to radiate laser light to the upper surface of each of the sheet-shaped lead tabs to define an upper surface processing pattern and, in a state when each of the sheet-shaped lead tab is reversed upside down by the lead tab reversing portion, radiate laser light to the lower surface of each of the sheet-shaped lead tabs to define a lower surface processing pattern
Implementation Method 2
a stabilization unit configured to provide an oxidation film to the upper and lower surfaces of each of the sheet-shaped lead tabs, the upper and lower surfaces having the processing pattern defined thereon, by applying heat with a certain temperature or above to each of the sheet-shaped lead tabs
Data Source
AI summary
An apparatus for manufacturing a lead tab for a secondary battery may include a supply roll configured to unwind and supply an original sheet of a lead tab wound in a roll state; a cutting unit configured to cut the original sheet of the lead tab continuously supplied, at intervals, to be divided into sheet-shaped lead tabs; and a marking unit configured to define a processing pattern on a processing area set on each of an upper surface and a lower surface of each of the sheet-shaped lead tabs. When an upper surface processing pattern and a lower surface processing pattern are defined to improve adhesion with a sealant film, laser light is not radiated to the original sheet of the lead tab unwound from the supply roll and having a great length, but to set areas of the sheet-shaped lead taps obtained by pre-cutting to have a set length.