Apparatus and system for balancing energy in battery pack

An apparatus for balancing energy in a battery pack, comprising:

• a transmitting coil, configured to input a first alternating current, and transmit an electromagnetic wave generated by the first alternating current to multiple receiving coils;
• the multiple receiving coils, wherein parameter values of all receiving coils of the multiple receiving coils are the same, all the receiving coils are coupled to the transmitting coil in an electromagnetic induction manner at a same coupling strength, and each receiving coil is configured to receive the electromagnetic wave transmitted by the transmitting coil, and generate and output a second alternating current according to the electromagnetic wave;
• and
• multiple rectifiers, wherein the multiple rectifiers are connected to the multiple receiving coils in a one-to-one correspondence, and each of the multiple rectifiers is configured to convert the input second alternating current into a direct current, and output the direct current to one individual battery in a battery pack, wherein the multiple rectifiers and multiple individual batteries in the battery pack are in a one-to-one correspondence.