This technology involves inserting a porous metal foil with an insulating coating layer between the anode and cathode and electrically connecting it to the electrode lead. This disperses current during an internal short circuit, suppressing heat generation while providing a stable ion pathway.
Conventional secondary batteries are prone to rapid exothermic reactions and fire risks during internal short circuits. While inserting a conductive sheet can mitigate this, it often blocks electrolyte movement, leading to reduced energy density or increased manufacturing complexity.
This technology places a porous metal foil, coated on at least one side with a metal oxide or insulating polymer, between the anode and cathode and connects it to the lead. This configuration disperses short-circuit current over a wide area while maintaining ion transport pathways for the electrolyte through the pores. Applicable to electric vehicle battery packs, energy storage systems, and next-generation cells using lithium metal anodes, it prevents thermal runaway during accidents such as nail penetration or crushing while minimizing energy density loss.
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