Metal secondary battery

Lithium metal cell with suppressed dendrite formation via cross-arranged lead tabs and localized pressure at connection points

This technology mitigates localized current density in metal secondary batteries using lithium anodes by controlling the layout of lead tabs and the physical surface pressure at electrode connection points, thereby suppressing the formation and growth of metallic dendrites.

When using metal electrodes such as lithium anodes, current density tends to concentrate locally around the areas where lead tabs are attached. This leads to rapid dendrite formation in these regions, which compromises the safety and reliability of the battery.

This technology disperses current concentration areas by attaching the cathode and anode lead tabs in different directions, distributes current evenly across multiple lead tab units, and increases surface pressure around the lead tab connection points using insulating protrusions or embossed/debossed patterns on the electrode plates. It can be applied to high-energy-density pouch cells using lithium metal anodes and next-generation battery cell designs for drones and electric vehicles, providing a solution that reduces short-circuit risks through cell structure optimization alone, without requiring material changes.

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Key Features:

• A cell assembly consisting of alternating layers of cathode plates, lithium-based anode plates, and separators.
• A lead tab configuration where cathode and anode lead tabs are attached to their respective electrode plates in different directions to disperse current concentration.
• An anode plate where the surface pressure in a specific area centered around the anode lead tab connection point is higher than the average surface pressure.
• An insulator featuring protrusions that enclose the cell assembly and lead tab section, applying pressure to the area surrounding the anode lead tab connection point.

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