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.

A controller for a phase change switch device, a system including the controller, a phase change switch device, and a corresponding method are provided. The controller includes a control input configured to receive a first control signal indicating a desired state of the phase change switch device and a measurement input configured to receive a measurement signal indicating an actual state of the phase change switch device. A control logic is configured to generate a second control signal based on the first control signal and the measurement signal. The controller further includes a control output configured to output the second control signal to at least one heater of the phase change switch device.

A protection device includes a meltable conductor, an electrode set, and a heating element. The meltable conductor has a core metal layer and a bottom covering layer with low melting point. The core metal layer has a first low melting point metal layer, a second low melting point metal layer, and a high melting point metal layer laminated therebetween. The bottom covering layer with low melting point is disposed on a bottom surface of the core metal layer. The electrode set has a first electrode and a second electrode respectively connected to two terminals of the meltable conductor. The heating element is disposed under the bottom covering layer, thereby heating up and blowing the meltable conductor in the event of over-voltage.

A surface mount fuse and fuse element thereof are disclosed. The fuse element has a lead-free flat fuse, a flux layer, and a porous metal layer. The porous metal layer is bonded on one surface of the lead-free flat fuse through the flux layer. A part of the flux layer penetrates into the porous metal layer through capillary action, so the flux fills the pores of the first porous metal layer to distribute on the lead-free flat fuse evenly. When overcurrent occurs in the current loop and high temperature occurs, the flux layer helps the porous metal layer and the lead-free flat fuse to melt effectively, thereby interrupting the current loop in time.

A smart fuse for circuit protection includes a first shaft and second shaft separated by a gap. A heater is located inside portions of the first and second shafts, and the heater is held in place within the shafts by a solder alloy that fills the gap. The shafts and solder alloy form an electrical signal path through the fuse. A spring is attached to the heater. The spring is stretched such that the spring exerts a force on the heater. The solder alloy holds the heater in place and resists the force exerted by the spring. In an activation condition of the fuse, the heater increases in temperature and melts the solder alloy. The melted solder alloy no longer resists the force exerted by the spring, and the spring pulls the heater through the second shaft until the gap is open, thereby severing the electrical connection through the fuse.

Provided is a fuse device capable of maintaining the insulation performance while using a fuse element having a considerable size to improve rating. The fuse device includes a fuse element 2 and a case 3 for housing the fuse element 2, and the case 3 has a resin portion 4 having a surface to be melted by heat accompanying blowout of the fuse element 2 on at least a part of an inner wall surface 8a facing the inside 8 housing the fuse element 2.

This protection element (100) has a fuse element (3), an insulating inorganic fibrous material (4) that is disposed in contact with or close to at least a part of the fuse element (3), and a case member (5) configured to enclose a part of the fuse element (3) and the insulating inorganic fibrous material (4).

A fuse element includes: a low-melting-point metal layer; a high-melting-point metal layer provided over at least one surface of the low-melting-point metal layer; and an intermediate layer disposed between the low-melting-point metal layer and the high-melting-point metal layer. Each of the high-melting-point metal layer and the intermediate layer is made of a metal that is liquefied by contacting a molten form of the low-melting-point metal layer. The high-melting point metal layer is made of silver or an alloy comprising silver as a main component thereof. A melting point of a material constituting the intermediate layer is higher than a melting point of a material constituting the low-melting-point metal layer and lower than a melting point of a material constituting the high-melting-point metal layer.

A fuse element (10) includes a low-melting-point metal layer (11), a high-melting-point metal layer (12) laminated on at least one surface of the low-melting-point metal layer (11), and an intermediate layer (13) disposed between the low-melting-point metal layer (11) and the high-melting-point metal layer (12), in which the high-melting-point metal layer (12) and the intermediate layer (13) are layers formed of a metal which is melted by a molten material of the low-melting-point metal layer (11), and the intermediate layer (13) has a higher ionization tendency than an ionization tendency of the high-melting-point metal layer (12).