Equalizing charging system for liquid state metal battery

Disclosed in the invention is an equalizing charging system for a liquid state metal battery. With the system, passive equalization of the liquid state metal battery under high temperatures is realized. According to the system, a non-linear resistor that is made of a SiC or GaN material and is resistant to the high temperature of 600 DEG C is used for being connected with the battery in parallel; the resistance value of the non-linear resistor is the largest when the voltages at the two ends of the resistor are less than a certain value; and almost no current flows through the branch where the resistor is located. When the battery is almost charged fully, the voltage of the battery rises rapidly, the resistance value of the non-linear resistor is reduced quickly, and most of charging currents flow through the resistor branch, thereby preventing an overcharging phenomenon of the battery. An external battery monitoring unit uses a series battery group as a unit to monitor the voltage and charging capacity of the battery group in real time; when any one of the two parameters exceeds a rated value, the charging loop is cut off instantly. According to the invention, the structure is simple and reliability is high; and equalizing charging of the liquid state metal battery can be realized well.