Battery balancing apparatus using piezoelectric transformers and related device

A battery assisting method, applied to an electronic device, wherein the electronic device comprises a piezoelectric transformer group and a drive circuit group;

• the piezoelectric transformer group comprises N piezoelectric transformers;
• the drive circuit group comprises N drive circuits;
• respective output ends of the N drive circuits are connected to respective input ends of the N piezoelectric transformers in a one-to-one correspondence;
• respective output ends of the N piezoelectric transformers are connected to N battery cells in a battery string in a one-to-one correspondence, wherein N is an integer greater than 1;
• and the method comprises:
• respectively outputting first pulse signals to M piezoelectric transformers in the N piezoelectric transformers by using M drive circuits in the N drive circuits, wherein Mis a positive integer less than N;
• receiving the first pulse signal by using each of the M piezoelectric transformers, and outputting, driven by the first pulse signal, electric energy to the battery cell corresponding to each piezoelectric transformer for charging, so that voltages of the N battery cells are consistent;
• respectively outputting second pulse signals to the N piezoelectric transformers by using the N drive circuits, wherein a frequency of the second pulse signal is greater than a frequency of the first pulse signal;
• receiving the second pulse signal by using each of the N piezoelectric transformers, and generating an ultrasonic wave driven by the second pulse signal;
• and
• detecting a state of health of the battery cell corresponding to each piezoelectric transformer by using the ultrasonic wave.