What are the advantages and shortcomings of protection elements of battery?
Follow table compare their performance several familiar protection elements of battery: Name Main Materials Function Advantage Shortcoming Temperature- controlled switch PTC Large current protection Induce the current and temperature change quickly, too high temperature or too large current will make the temperature of double metal parcels in switch reaches its rated value, the double parcels break quickly, so the circuit is protected. The metal parcels may not set and the battery can’t work any more. Polyswitch PTC Large current protection The impedance of the element increases linearly when its temperature increase, and its impedance will increases sharply if the current or temperature reaches a specified value, so the current will decrease to several mA level. When the temperature decreases to normal level, the element can recover to initial state. It can be used to assemble battery as a connect parcel. High cost Fuse Induce the current and temperature of circuit Fuse will melt to p
