Circuit diagram of self-made battery repairer

　　An electric vehicle battery repairer sold on the market has not been effective. After analyzing its circuit structure, it was found that the repair is achieved by using high-voltage and high-frequency pulses through an oscillation circuit and a self-inductance boost coil. Due to frequency limitations, the self-inductance boost coil cannot be made very large, but for batteries with small internal resistance, the amplitude of the high-voltage pulses generated in static state becomes very low after being applied to the battery. Therefore, the repair effect on the battery is not obvious.

　　After consulting and proving the correctness of the basic principles of battery repair, I designed a high-performance repairer that uses a transformer to adjust the voltage and a 555 circuit to drive a CMOS tube with an adjustable pulse width oscillator. It completely overcomes the defects of the self-inductance boost coil circuit and has been used to achieve very good results. Generally, an old battery that has been used for nearly 3 years can be repaired in one day, and more than 70% of the rated capacity can be restored in 3 days (batteries with damaged plates cannot be repaired).

　　This circuit can be used for both repair and charging. The repair transformer uses a multi-tap transformer to suit batteries of different voltages. Batteries from 3v to 36v can be repaired. It must be noted that the voltage range selected when repairing the battery is twice the battery voltage. For example, when repairing a 12v battery, a 24v transformer range is selected, and when repairing a 36v battery, a 60v transformer range is selected, but the pulse width potentiometer must be adjusted to the minimum state (that is, the current is the minimum state). When charging, you can choose a transformer with the same voltage range and adjust the pulse width potentiometer appropriately to make the current a suitable charging current.

　　This circuit is simple and suitable for homemade. The ammeter uses a 5A range and the shunt can be wound by yourself with 1 square millimeter enameled wire. The required length is determined by measuring the actual current and the swing position of the meter head with a multimeter.