NOVELTY - A polymer thermal fuse element (10) has two electrode components (12,13), a matrix resin (11a) provided between electrode components and adheres the two electrode components and in which glass transition temperature is standard of operating temperature of a polymer thermal fuse element, insulation elastic-material particles (11b) fixed in the matrix resin in the state which is compressed along the thickness direction of the matrix resin, and is elastically deformed, and a fuse layer (11) containing electroconductive particles dispersed in the matrix resin.    USE - Polymer thermal fuse element is used for secondary battery cell (claimed) e.g. nickel-cadmium battery, nickel-hydrogen battery and lithium ion battery for electrical equipment.    ADVANTAGE - The polymer thermal fuse element having excellent operating time characteristics is manufactured, simply. The compact secondary battery cell protects the electrical equipment from overheating, and has excellent charging/discharging characteristics.    DETAILED DESCRIPTION - A polymer thermal fuse element has two electrode components, a matrix resin provided between electrode components and adheres the two electrode components and in which glass transition temperature is standard of operating temperature of a polymer thermal fuse element, insulation elastic-material particles fixed in the matrix resin in the state which is compressed along the thickness direction of the matrix resin, and is elastically deformed, and particle size is distance between the electrode components, and a fuse layer containing electroconductive particles dispersed in the matrix resin and ensures electroconductivity between electrode components. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of polymer thermal fuse element, which involves coating adhesive agent to which insulation elastic-material particles and electroconductive particles are dispersed in adhesive agent resin, hardening adhesive agent resin in the state which pressurized along the thickness direction of adhesive agent, after bonding an adhesive agent application portion together to the other electrode component, adhering matrix resin to two electrode components, dispersing electroconductive particles in the matrix resin and forming the fuse layer; and    (2) secondary battery cell, which has a battery main-component portion, matrix resin which is provided between the electrode component of a positive electrode or a negative electrode of the battery main-component portion, an electrode lead, insulation elastic-material particles and fuse layer containing electroconductive particles which is dispersed in the matrix resin and ensures electroconductivity between the electrode component and electrode lead.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of the polymer thermal fuse element. (Drawing includes non-English language text)    Polymer thermal fuse element (10)    Fuse layer (11)    Matrix resin (11a)    Insulation elastic-material particles (11b)    Electrode components (12,13)