Abstract: There is provided a circuit protection device that increases the possibility of enabling a circuit to be protected. The circuit protection device (1) comprises a bimetal switch (4) and a PTC element (2), which are electrically connected in parallel with each other. The PTC element has a post-operation resistance value of 1.

Abstract: In a current conducting terminal in contact with the positive electrode of a battery (A) and with the negative electrode of a battery (B) in order to conduct current between the two batteries (A), (B), a conductive polymer is placed between the positive electrode side electrode 1, which is in contact with the positive electrode of the battery (A), and the negative electrode side electrode (2), which is in contact with the negative electrode of the battery (B).

Abstract: A thermistor is provided with a third electrode placed so that it is not in contact with either the first or second electrode, and with a heating part integrally formed with the same material as the variable resistance part and in contact with the third electrode, the heating part changing the resistance value of the variable resistance part by generating heat when current passes between the third electrode and either of the first or second electrodes.

Abstract: A temperature protection device is provided, which comprises with a polymeric positive temperature coefficient (PTC) device 1 having a conductive polymer 5 placed between two electrodes 6 and 7, and a metal member 2 bonded to one of the electrodes 7 of the polymeric PTC device, and which, when the ambient temperature exceeds a prescribed temperature, terminates the current-flowing state between the other electrode 6 of the polymeric PTC device 1 and the metal member 2. The conductive polymer 5 expands thermally when the ambient temperature exceeds the prescribed temperature, and a material is selected for the metal member 2 that will melt as a result of the heat generated by the conductive polymer during the thermal expansion.

Abstract: A PTC device is provided which is capable of surely functioning as the PTC device even in a wiring through which a large current flows. A combined PTC device (10, 10?) is composed of two PTC devices each containing a lamellar PTC element (12, 12?) which is composed of a polymeric PTC material and a pair of electrodes (14, 16; and 14?, 16?) which are arranged apart from each other on one side of the PTC element. The electrodes (14, 16) of one PTC device are respectively opposite to the electrodes (14?, 16?) of the other PTC device, and terminals (20, 21) are arranged between the respective opposite electrodes. The respective opposite electrodes and the terminal between them are electrically connected with each other.

Abstract: A waterproof lead includes an electric wire, a terminal, and a heat-shrink tube. The electric wire has an insulative cover and a plurality of exposed core wires. The terminal has a contact member, a core wire crimping section that crimps the plurality of exposed core wires, and an insulative cover crimping section that crimps the insulative cover. The heat-shrink tube covers at least a leading end of the exposed core wires adjacent to the core wire crimping section. An adhesive is provided on an internal surface of the heat-shrink tube. The adhesive seals clearances between adjacent exposed core wires.

Abstract: An overvoltage protection device is adopted, which is provided with a conductive polymer that runs away thermally when the resistance value becomes V2/P or higher, given that the power consumption when actuated is P and the voltage of the secondary battery cell when fully charged is V.

Abstract: A temperature protection device is provided, which comprises with a polymeric PTC device 1 having a conductive polymer 5 placed between two electrodes 6 and 7, and a metal member 2 bonded to one of the electrodes 7 of the polymeric PTC device, and which, when the ambient temperature exceeds a prescribed temperature, terminates the current-flowing state between the other electrode 6 of the polymeric PTC device 1 and the metal member 2; the conductive polymer 5 is given a characteristic wherein it expands thermally when the ambient temperature exceeds the prescribed temperature, and a material is selected for the metal member 2 that will melt through the heat generation of the conductive polymer, which has overheated through thermal expansion.

Abstract: The invention provides a solid electrolytic capacitor which comprises a capacitor element including an anode body having an anode leading member, and a dielectric coating layer, a solid electrolyte layer and a cathode leading layer which are formed successively over a surface of the anode body. The anode leading member has an anode terminal member connected thereto, the cathode leading layer has a cathode terminal member connected thereto, and the capacitor element is covered with a packaging resin portion. The cathode terminal member is connected to the cathode leading layer with current control means provided therebetween. The current control means comprises a current control layer reversibly increasable in electrical resistance with overcurrent or excessive heat, and a pair of electrode members each in the form of a plate or foil and having the current control layer sandwiched therebetween. The electrode members are joined to the cathode leading layer and the cathode terminal member, respectively.

Abstract: A circuit protection arrangement particularly useful in protecting battery assemblies. The arrangement contains a first PTC device which has a first switching temperature Ts1, has a resistance at 20° C. R1, has a hold current at a first specified temperature IH1, and is made from a first PTC resistive element composed of a first conductive polymer composition attached to first and second electrodes, and a second PTC device which is electrically connected in series with the first PTC device, has a second switching temperature Ts2 which is less than Ts1, has a resistance at 20° C. R2 which is less than R1, has a hold current at the first specified temperature IH2 which is greater than IH1, and is made from a second PTC resistive element composed of a second conductive polymer composition attached to third and fourth electrodes.

Abstract: The invention provides a solid electrolytic capacitor which comprises a capacitor element including an anode body having an anode leading member, and a dielectric coating layer, a solid electrolyte layer and a cathode leading layer which are formed successively over a surface of the anode body. The anode leading member has an anode terminal member connected thereto, the cathode leading layer has a cathode terminal member connected thereto, and the capacitor element is covered with a packaging resin portion. The cathode terminal member is connected to the cathode leading layer with current control means provided therebetween. The current control means comprises a current control layer reversibly increasable in electrical resistance with overcurrent or excessive heat, and a pair of electrode members each in the form of a plate or foil and having the current control layer sandwiched therebetween. The electrode members are joined to the cathode leading layer and the cathode terminal member, respectively.

Abstract: A PTC device formed integrally on a PCB substrate, such a PCB substrate, a secondary battery protection circuit device comprising such PCB substrate provided with a circuit to control the voltage and current of secondary batteries, and a secondary battery assembly provided with said device. A PCB substrate 1 is provided with an electronic component 2 and a PTC device 3. The PTC device 3 has a construction having a PTC material 6 in the center, which is provided with foils 7, 7′ made of nickel foil on its top and bottom; an outlet electrode 4 is provided on the foil 7, and an outlet electrode 5, provided on the PCB substrate, is soldered below.

Abstract: An electrical device comprising a pair of electrodes, three substrates, and PTC elements inserted between the substrates, each PTC element having metal layers on both surfaces, in which each of the outer substrates has a metal layer on the inner surface, the two metal layers being electrically connected to one of the electrodes and in electrical contact with the respective metal layers of the PTC elements facing said metal layers of the outer substrates, and the center substrate has a metal layer on both surfaces, such metal layers being electrically connected to the other electrode and in electrical contact with the respective metal layers of the PTC elements facing said metal layers of the center substrate. This electrical device can increase the area of the PTC elements without increasing the projected area as a whole.

Abstract: A battery pack and a PTC device are provided that can be used safely under large current loads by increasing the area of the incorporated PTC layer so as to decrease its internal resistance. The battery pack has a plurality of unit cells (1) placed side by side in parallel and the PTC device P to protect the unit cells (1) from overcurrents. The PTC device P has a first electrode (3) and a second electrode (4) connected to the both surfaces of the PTC layer (2). The PTC layer is formed to an outer shape that covers almost the entirety of the end surfaces of the two unit cells (1) to which the first electrode (3) and the second electrode (4) are connected, and has through holes (2B) positioned against the end electrodes (1A) of the unit cells (1).