Reinforced Battery Electrode Substrate for Thin-Foil Breakage

The patent applies composite materials by combining a metal substrate (aluminum or aluminum alloy) with reinforcement bodies made of high-strength materials such as carbon fiber, glass fiber, or aromatic polyamide. These reinforcement bodies are dispersed within the substrate material to create a composite structure that maintains thinness while significantly improving mechanical strength and breakage resistance.

The patent implements local quality by strategically distributing reinforcement bodies at specific locations within the substrate where stress concentration is most likely to occur. The reinforcement bodies are not uniformly distributed but rather placed in regions that require enhanced strength, such as areas prone to bending or breaking during manufacturing processes like rolling, slitting, and notching.

The composite structure with embedded reinforcement bodies prevents substrate breakage and deformation during manufacturing processes, thereby maintaining consistent thickness and reducing defects such as pinholes. The reinforcement bodies act as structural support that enables precise manufacturing even at minimal thickness levels of 4 μm to 8 μm.

The reinforcement bodies are incorporated into the substrate beforehand to provide preventive cushioning against breakage and deformation that may occur during subsequent manufacturing processes. This prior reinforcement ensures that the thin substrate can withstand the mechanical stresses of rolling, slitting, and notching without compromising manufacturing precision.