CONTROLLED HIGH CURRENT FUSE-LINK

摘要

A controlled high current fuse-link is provided, which can protect a rechargeable battery and carry a rating working current of scores or hundreds of Amperes. The controlled high current fuse-link comprises a non-metallic housing (5), which supports two metal plates (6,7). One end of each of the metal plates (6,7) is connected to a high current circuit. The metal plates (6,7) are arranged in parallel, and one side of each of the metal plates (6,7) is designed like a comb by welding strips (11a,11b). Some low melting point alloy wires (3) arranged in parallel to constitute a main fuse-link (1) are linked with the welding strips (11a,11b). The controlled high current fuse-link has two heaters (8,9), which are thermally coupled to the metal plates (6,7) and are powered by another current loop which has no current flowing through normally. When the current of a main circuit is abnormal or the temperature of a battery is abnormal, a monitor circuit will energize the heaters (8,9),and the metal plates (6,7) will be heated up by the heaters (8,9), then the main fuse-link (1) will melt with each of the alloy wires (3) broken completely by the action of fluxes. Furthermore, there is a small thermal fuse (10) connected in series to the heaters (8,9). As the melting temperature of the small thermal fuse (10) is higher than that of the main fuse-link (1), the main fuse-link (1) is broken earlier.