A device for controlling battery operation includes a battery cell, a thermal cutoff, and a battery management system. The thermal cutoff is coupled in series between the battery cell and a system load of the device. The thermal cutoff has at least three terminals. A first terminal of the thermal cutoff is electrically-coupled to the battery cell and a second terminal of the thermal cutoff is electrically-coupled to the system load. The thermal cutoff includes a permanent failure mechanism having an open state and closed state wherein the closed state allows electrical communication between the first terminal and the second terminal. The battery management system is electrically-coupled to a third terminal of the thermal cutoff. The permanent failure mechanism permanently switches to the open state in response to an electrical signal from the battery management system.

A temperature-sensitive pellet type thermal fuse having a cylindrical metal case (10) with one end electrically connected to a first lead (L1) and a second lead (L2) installed on the other end via an insulating bushing (50). A temperature-sensitive pellet (30) on a spring (13) is in an inner space (S1) of the case (10). A switch terminal (40) has an upper surface (42) electrically connected to the second lead (L2) by an elastic force of the spring (13). A contact terminal piece (41) extends from the upper surface (42) to contact the inner wall surface (11) of the case 10. An activating member operates when the temperature-sensitive pellet (30) is reduced in height to a predetermined level or less, and releases contact between the contact terminal piece (41) and the case (10) to cut off an electrical connection between the first lead (L1) and the second lead (L2).

A temperature-sensitive pellet type thermal fuse having a metal case (10); a first lead wire (L1) on an open end of the metal case (10) and insulated from the metal case (10); a second lead wire (L2) electrically connected to the bottom wall (12) of the metal case (10); a temperature-sensitive pellet (30) installed inside the case (10); a movable terminal (60) being in contact with the second lead wire (L2) and a fixed terminal (40) when below a fuse cutoff operation temperature, and being in contact with the metal case (10) but separated from the second lead wire (L2) when above the fuse cutoff operation temperature; the movable terminal (60) having a movable contact element (50) slidably contacting with the inner wall of a through hole (41) of the fixed terminal (40) to electrically connect to the fixed terminal (40).

A thermally protected metal-oxide varistor is provided, including a disconnecting unit, a first varistor assembly and a second varistor assembly. The first varistor assembly and the second varistor assembly are connected in series through a low-melting-point alloy layer; wherein when the low-melting-point alloy layer is fused, the disconnecting unit acts to cut off the low-melting-point alloy. The two varistors are connected directly through solder joints without any transition connection member. The heat transfer path is reduced to the shortest path, and a faster response is realized compared to conventional products formed by a varistor and a disconnecting unit when abnormal over-current passes. Moreover, the slider functions as a physical separator capable of isolating the two varistors after the solder joints are fused, which further diminishes the risk of fire occurrence caused by the failure of instantly blocking current by the disconnecting unit when the varistor breaks down by over-current.

A temperature-sensitive pellet type thermal fuse is disclosed. The thermal fuse comprises a metal case (10); a first lead wire (L1) fixedly installed on an open end of the case (10) to be insulated from the case (10) by an insulating bushing (20); a second lead wire (L2) electrically connected to the bottom wall (12) of the case (10); a temperature-sensitive pellet (12) installed inside the case (10); a movable terminal (60) being in contact with the fixed contact point (L2a) of the second lead wire (L2) and with the fixed terminal (40) below a fuse cutoff operation temperature, and being in contact with the case (10) but separated from the fixed contact point (L2a) of the second lead wire (L2) above the fuse cutoff operation temperature; a fixed terminal (40) having a through hole (41) with an inner wall, and being fixed on an inner wall (11) of the case; and the movable terminal (60) having a movable contact element (50) slidably contacting with the inner wall of the through hole (41) of the fixed terminal (40) to electrically connect to the fixed terminal (40).

The invention relates to a thermally triggerable indication or switching device, having a movable, mechanically preloaded slide which directly or indirectly triggers or actuates the indication or switching device, and having a preformed part which changes its state of aggregation under the effect of heat, the preformed part, in the functional state, being adapted to be arranged so as to block the movable slide. According to the invention, in the initial state, the preformed part is loosely located in a receiving space. For transferring the preformed part to the functional state, the slide is moved in a position such that a gap space opens between the slide and a slide stop, wherein the preformed part enters the gap space and the slide is simultaneously preloaded.

The invention relates to a thermally triggerable indication or switching device, having a movable, mechanically preloaded slide which directly or indirectly triggers or actuates the indication or switching device, and having a preformed part which changes its state of aggregation under the effect of heat, the preformed part, in the functional state, being adapted to be arranged so as to block the movable slide. According to the invention, in the initial state, the preformed part is loosely located in a receiving space. For transferring the preformed part to the functional state, the slide is moved in a position such that a gap space opens between the slide and a slide stop, wherein the preformed part enters the gap space and the slide is simultaneously preloaded.

An overheating destructive disconnecting method for switch, which enables a first elastic force to concurrently apply force to an overheating destructive member and a movable conductive member. Moreover, the force direction causes the movable conductive member to concurrently contact a first conductive member and a second conductive member to form a conductive circuit. A second elastic force acts on the movable conductive member, and the force direction thereof causes the movable conductive member to separate away from the first conductive member or the second conductive member, The overheating destructive member is positioned in a required non-electric transmission path and at a distance from the movable conductive member. When the overheating destructive member is destructed or deformed under a fail temperature condition, the first elastic force is lessened or lost, at which time the second elastic force causes the movable conductive member to change position, thereby breaking the current-carrying circuit.

The temperature sensitive pellet type thermal fuse includes a cylindrical case which has a first end and a second end, a temperature sensitive pellet, an insulating tube, a first lead which is inserted into the insulating tube and has an inner end serving as a contact portion, a movable contact which is electrically connected to the cylindrical case, a weak compression spring, a strong compression spring, and a second lead which is disposed on the second end of the cylindrical case. The movable contact includes a projecting contact portion which is provided at a central part of the movable contact, and the projecting contact portion and the contact portion of the first lead are in contact with each other inside the insulating tube.

The invention relates to a thermally triggered, mechanical switching device, consisting of a heat-sensitive means and a mechanical force-storage means, wherein the heat-sensitive means blocks or unblocks the movement path of a switching piece; furthermore, the switching piece is preloaded and held by the mechanical force-storage means, and comprising a housing that accommodates the aforementioned means. According to the invention, the housing is designed as a cartridge-shaped shell which receives a plunger in the interior thereof, which plunger is mounted in a movable manner through a first end-side opening in the housing and is supported against a fusible shaping part under pretension, wherein the fusible shaping part is arranged so as to cover a second opening, which is located opposite the first end-side opening, in such a way that, when the melting temperature of the fusible shaping part is reached, said fusible shaping part is displaced by the plunger and the plunger takes on a changed position.