An intelligently controllable charge equalization apparatus for a battery string connected in series, comprising: a battery string having M (M≥2: M is a natural number) battery modules (111, 112, 113, 114, 115, 116) connected in series, each battery module (111, 112, 113, 114, 115, 116) having a plurality of batteries (B i,j) connected in series; a single voltage sensing module sensing voltage of each battery (B i,j) of the battery string; a single charge equalizing module and a microprocessor, characterized in that the single charge equalizing module is connected to the voltage sensing module in parallel and charges or discharges each battery (B i,j) of the battery string; and in that the apparatus further comprises: a respective bidirectional switch block (121, 122, 123, 124, 125, 126) that is included in each of the battery modules (111, 112, 113, 114, 115, 116) and forms a parallel current path in each battery (B i,j) of the battery module (111, 112, 113, 114, 115, 116); a module switch forming a current path between the bidirectional switch blocks (121, 122, 123, 124, 125, 126) and at least one of the single voltage sensing module and the single charge equalizing module; and in that the microprocessor determines charge or discharge of the battery by receiving a voltage value measured in the voltage sensing module and controlling the bidirectional switch block and the module switch, wherein each battery (B i,j) of the battery string shares the single voltage sensing module and the single charge equalizing module by the bidirectional switch block (121, 122, 123, 124, 125, 126) and the module switch. a battery string having M (M≥2: M is a natural number) battery modules (111, 112, 113, 114, 115, 116) connected in series, each battery module (111, 112, 113, 114, 115, 116) having a plurality of batteries (B i,j) connected in series; a single voltage sensing module sensing voltage of each battery (B i,j) of the battery string; a single charge equalizing module and a microprocessor, characterized in that the single charge equalizing module is connected to the voltage sensing module in parallel and charges or discharges each battery (B i,j) of the battery string; and in that the apparatus further comprises: a respective bidirectional switch block (121, 122, 123, 124, 125, 126) that is included in each of the battery modules (111, 112, 113, 114, 115, 116) and forms a parallel current path in each battery (B i,j) of the battery module (111, 112, 113, 114, 115, 116); a module switch forming a current path between the bidirectional switch blocks (121, 122, 123, 124, 125, 126) and at least one of the single voltage sensing module and the single charge equalizing module; and in that the microprocessor determines charge or discharge of the battery by receiving a voltage value measured in the voltage sensing module and controlling the bidirectional switch block and the module switch, wherein each battery (B i,j) of the battery string shares the single voltage sensing module and the single charge equalizing module by the bidirectional switch block (121, 122, 123, 124, 125, 126) and the module switch. a respective bidirectional switch block (121, 122, 123, 124, 125, 126) that is included in each of the battery modules (111, 112, 113, 114, 115, 116) and forms a parallel current path in each battery (B i,j) of the battery module (111, 112, 113, 114, 115, 116); a module switch forming a current path between the bidirectional switch blocks (121, 122, 123, 124, 125, 126) and at least one of the single voltage sensing module and the single charge equalizing module; and in that the microprocessor determines charge or discharge of the battery by receiving a voltage value measured in the voltage sensing module and controlling the bidirectional switch block and the module switch, wherein each battery (B i,j) of the battery string shares the single voltage sensing module and the single charge equalizing module by the bidirectional switch block (121, 122, 123, 124, 125, 126) and the module switch.