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: 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 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: A circuit protection device suitable for welding to a battery terminal or other substrate without adverse affects caused by weld splatter. The device contains a laminar PTC resistive element, e.g. made from a conductive polymer composition, sandwiched between first and second electrodes. A first electrical lead has a first attachment portion having an attachment surface which is attached to the first electrode, a first connection portion which can be connected to an electrical circuit and is spaced away from the PTC element, and a first barrier portion. The first barrier portion is positioned on the first lead between the first attachment and first connection portions and extends toward the second electrode. During resistance welding, the barrier portion prevents weld splatter from contacting the PTC resistive element.

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: A circuit protection device suitable for welding to a battery terminal or other substrate without adverse affects caused by weld splatter. The device contains a laminar PTC resistive element, e.g. made from a conductive polymer composition, sandwiched between first and second electrodes. A first electrical lead has a first attachment portion having an attachment surface which is attached to the first electrode, a first connection portion which can be connected to an electrical circuit and is spaced away from the PTC element, and a first barrier portion. The first barrier portion is positioned on the first lead between the first attachment and first connection portions and extends toward the second electrode. During resistance welding, the barrier portion prevents weld splatter from contacting the PTC resistive element.

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: A PTC device which surely achieve effective space utilization while easily excluding the possibility of the formation of a short circuit. The PTC device includes a PTC component 3 comprising a first electrode 11, a second electrode 13, and a PTC element 9 disposed between these electrodes, a first electrically conductive lead 15 which is connected to the first electrode and able to connect with a button terminal of a battery, a second electrically conductive lead 18 which is connected to the second electrode, and an insulating element 23. The insulating element covers the inner periphery 7 of the PTC component, the second electrode and a portion of the second electrode and the second electrically conductive lead on the second electrode.

Abstract: A housing contains a PTC element which can be easily inserted and removed. Conductive metal retaining elements of the housing are secured to the base of the housing, and retain the PTC element with a generally planar portion parallel to the electrodes of the PTC component. The retaining elements also have slidable contact between the elements and the top of the housing so as to modify the elastic deformation of the element and allow for insertion and removal of the PTC element.

Abstract: An image forming apparatus includes a toner processing unit which is detachably fitted to a cleaning device and a developing unit arranged in the apparatus body. The unit has first and second container integrated with each other. The first container defines a storing portion storing toner which is to be supplied to the developing unit. The second container defines a recovery portion for receiving waste toner removed by the cleaning means. The storing portion and recovery portion are partitioned from each other by a partitioning wall of the unit. The partitioning wall has a through-hole through for introducing, when the amount of the developing agent received into the recovery portion exceeds a capacity of the recovery portion, an excess part of the developing agent into the storing portion.