A bypass avoiding only abnormal cells or abnormal electronic components in an electronic appliance having a plurality of battery cells or electronic components is formed to decrease resistance while keeping functionality.

A bypass avoiding only abnormal cells or abnormal electronic components in an electronic appliance having a plurality of battery cells or electronic components is formed to decrease resistance while keeping functionality. An insulating substrate 2; a heat-generating resistor 3 arranged on the insulating substrate 2; a first and a second electrodes 4, 5 arranged adjacently to each other on the insulating substrate 2; a third electrode 6 arranged adjacently to the first electrode 4 and electrically connected to the heat-generating resistor; and a first meltable conductor 8 arranged between the first and third electrodes 4, 6 to constitute a current path capable of being blown by a heat generated by the heat-generating resistor 3 are provided. The first meltable conductor 8 melted by heat from the heat-generating resistor 3 gathers on the first and second electrodes 4, 5 to short-circuit them.

A bypass avoiding only abnormal cells or abnormal electronic components in an electronic appliance having a plurality of battery cells or electronic components is formed to decrease resistance while keeping functionality. An insulating substrate 2; a heat-generating resistor 3 arranged on the insulating substrate 2; a first and a second electrodes 4, 5 arranged adjacently to each other on the insulating substrate 2; a third electrode 6 arranged adjacently to the first electrode 4 and electrically connected to the heat-generating resistor; and a first meltable conductor 8 arranged between the first and third electrodes 4, 6 to constitute a current path capable of being blown by a heat generated by the heat-generating resistor 3 are provided. The first meltable conductor 8 melted by heat from the heat-generating resistor 3 gathers on the first and second electrodes 4, 5 to short-circuit them.

A controllable circuit protector for power supplies with different voltages includes a first fuse and a second fuse connected in series to each other, a first heating unit, and at least one second heating unit in parallel to the first heating unit. A connected end of the first heating unit is electrically connected to a series-connected node between the first fuse and the second fuse, and a free end thereof forms a control terminal. When a load is irregular, the control terminal is connected to a ground terminal through a switch. For power supplies with different voltages, the effective resistance of the first heating unit and a part of the at least one second heating unit not melting is altered without causing drastic change arising from voltage variation to the total heating power, and the first fuse or the second fuse can duly melt down to protect the load.

A bypass avoiding only abnormal cells or abnormal electronic components in an electronic appliance having a plurality of battery cells or electronic components is formed to decrease resistance while keeping functionality.

A bypass avoiding only abnormal cells or abnormal electronic components in an electronic appliance having a plurality of battery cells or electronic components is formed to decrease resistance while keeping functionality.

The object of the present invention is to provide a protection device capable of sufficiently suppressing the occurrence of arc at the time of activation with large rated voltage and rated current, as well as capable of fully opening the circuit. The present invention provides a protection device comprising: (i) a protection component comprising a first thermal fuse and a resistive body, the resistive body being supplied with a current in an abnormal state to generate heat, the heat activating the first thermal fuse to cut off the current; (ii) a PTC component; and (iii) a second thermal fuse, the second thermal fuse being electrically connected in series to the PTC component, the first thermal fuse of the protection component being electrically connected in parallel to the PTC component and to the second thermal fuse, and the protection component being activated in the abnormal state so that the PTC component trips to generate heat, the heat blowing the second thermal fuse.

A protective element includes: a rectangurarly shaped insulating substrate; a heat-generating element formed on the insulating substrate; first and second electrodes laminated on a surface of the insulating substrate; first and second connecting terminals provided on a back surface of the insulating substrate and being continuous with the first and second electrodes; a heat-generating element extracting electrode provided on a current path between the first and the second electrodes and electrically connected to the heat-generating element; and a meltable conductor laminated on a region extending from the heat-generating element extracting electrode to the first and second electrodes and to be melted by heat to interrupt the current path between the first electrode and the second electrodes; wherein at least one of the corner portions of the insulating substrate is chamfered.

Systems and methods for redundant circuit disconnection in electric vehicles are disclosed. Systems can include a resistive metallic fuse connected within an electrical circuit for a battery or otherwise, an inductor comprising a coil of at least one turn of wire about a longitudinal axis, and an AC power source configured to provide an alternating current across the inductor. The resistive metallic fuse may be disposed within the inductor along the longitudinal axis, and the AC power source may be configured to cause the inductor to induce within the resistive metallic fuse eddy currents of sufficient magnitude to melt or vaporize at least a portion of the resistive metallic fuse disposed therein.

Systems and methods for redundant circuit disconnection in electric vehicles are disclosed. Systems can include a resistive metallic fuse connected within an electrical circuit for a battery or otherwise, an inductor comprising a coil of at least one turn of wire about a longitudinal axis, and an AC power source configured to provide an alternating current across the inductor. The resistive metallic fuse may be disposed within the inductor along the longitudinal axis, and the AC power source may be configured to cause the inductor to induce within the resistive metallic fuse eddy currents of sufficient magnitude to melt or vaporize at least a portion of the resistive metallic fuse disposed therein.