Negative Electrode Hole Patterning for Fast-Charging Battery Safety

The patent applies preliminary action by pre-forming recessed portions in the negative electrode film layer before electrochemical processing. These recessed portions are created through a controlled process involving photosensitive adhesive coating, UV exposure, and development, which prepares the electrode structure in advance to facilitate subsequent ion transport and prevent dendrite formation during charging operations.

The patent utilizes porous material principles by creating a controlled porous structure within the negative electrode film layer through the recessed portions. This porous architecture increases the surface area and provides pathways for electrolyte penetration and ion transport, thereby improving fast-charging ability and safety performance without significantly complicating the overall manufacturing process.

The patent employs an intermediary approach by using photosensitive adhesive as a temporary structuring agent. The photosensitive adhesive is coated on the negative electrode current collector, exposed to UV light through a mask to form recessed portions, and then removed after serving its purpose. This intermediary material enables precise hole structure formation without requiring direct precision manufacturing of the final electrode structure.

The patent replaces mechanical precision drilling or punching methods with a photochemical system. Instead of using mechanical tools to create holes with high precision, the patent uses UV light exposure through a mask to selectively cure photosensitive adhesive, which is then removed to form the desired hole structure. This substitution of mechanical processes with photochemical processes achieves higher precision with less complex manufacturing equipment.