NOVELTY - The sheet has multiple plastic layers with a metal layer, where each plastic layer includes heat conductive particles and micro encapsulated-phase-change-material particles. Each plastic layer is comprised of a laminate multi-layered film/sheet structure. The plastic layers are overlapped with each other. The plastic layer comprises polyethylene, polyethylene copolymers, polyamides, ethylene/vinyl alcohol (EVOR) copolymers, ethylene vinyl acetate (EVA) copolymers, polypropylene, high density polyethylene (HDPE), low density polyethylene (LDPE) and linear low-density polyethylene (LLDPE).    USE - Thermal management multi-layered film/sheet i.e. plastic-plastic-plastic (PPP), plastic-adhesive-plastic (PAP), plastic-metal-plastic and plastic-adhesive-metal-adhesive-plastic (PMAP) multi-layered films/sheets, for forming as a multi-layered tube structure to be used in a secondary battery i.e. prismatic lithium ion battery and cylinder lithium ion battery, and a super capacitor (all claimed), as phase change type heat sink and/or insulator to protect a secondary battery/super capacitor from thermal impact caused by high-temperature environment.    ADVANTAGE - The film/sheet enables better heat dissipation of the secondary battery/super capacitor while enabling simple manufacturing process of secondary batteries/super capacitors. The sheet improves charging and discharging efficiency, and prolongs service life of the battery.    DETAILED DESCRIPTION - The metal layer laminated on the plastic layer comprises nickel, copper, tungsten, molybdenum, aluminum, steel, silver, gold or respective alloys. The adhesive layer in the sheet comprises alkyl ester copolymer, alkyl ester or olefins. The heat conductive particles comprise silver coated copper powders, silver, nickel, aluminum, copper, tin powders, alloy metal powders, hydride-dehydrogenated titanium powders, stainless powders, graphite powders, carbon black powders, nano-metal powders, spherical alumina powders, aluminum nitride powders, hexagonal boron nitride powders, super fine spherical aluminum powders or sintering body of powder mixture. A phase change material included in the sheet is comprised of hydrated salt, paraffin or olefin. An INDEPENDENT CLAIM is also included for a thermal management multi-layered hollow article for use with a secondary battery and a super capacitor, comprising a set of heat conductive particles.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a multi-layered tube structure.    Fin (902)