A battery cell balance circuit, comprising a plurality of battery cells (Cell 1-Cell m, Cell 1-Cell 6), a plurality of switches (S 1A -S mB, S 1 -S m+1, RL1-RL6), each of the switches (S 1A -S mB, S 1 -S m+1, RL1-RL6) correspondingly connected to each of the battery cells (Cell 1-Cell m, Cell 1-Cell 6), and an AC/DC converter, configured to receive an AC power (V AC) and convert the AC power (V AC) into a DC power, characterized in that the battery cell balance circuit further comprises: an isolated DC/DC converter, an input side of the isolated DC/DC converter coupled in parallel to an input side of each of the switches (S 1A -S mB, S 1 -S m+1, RL1-RL6), and an output side of the isolated DC/DC converter coupled to a battery link (L CELL), wherein the plurality of battery cells (Cell 1-Cell m, Cell 1-Cell 6) are connected in series to form a battery link (L CELL), a circuit switch (S C), coupled between the AC/DC converter, the isolated DC/DC converter, and the plurality of switches (S 1A -S mB, S 1 -S m+1, RL1-RL6), and a control unit, configured to provide a plurality of control signals (SRL1-SRL6, S1c-S7c, S CC) to correspondingly control the plurality of switches (S 1A -S mB, S 1 -S m+1, RL1-RL6) and the circuit switch (S C). a plurality of battery cells (Cell 1-Cell m, Cell 1-Cell 6), a plurality of switches (S 1A -S mB, S 1 -S m+1, RL1-RL6), each of the switches (S 1A -S mB, S 1 -S m+1, RL1-RL6) correspondingly connected to each of the battery cells (Cell 1-Cell m, Cell 1-Cell 6), and an AC/DC converter, configured to receive an AC power (V AC) and convert the AC power (V AC) into a DC power, characterized in that the battery cell balance circuit further comprises: an isolated DC/DC converter, an input side of the isolated DC/DC converter coupled in parallel to an input side of each of the switches (S 1A -S mB, S 1 -S m+1, RL1-RL6), and an output side of the isolated DC/DC converter coupled to a battery link (L CELL), wherein the plurality of battery cells (Cell 1-Cell m, Cell 1-Cell 6) are connected in series to form a battery link (L CELL), a circuit switch (S C), coupled between the AC/DC converter, the isolated DC/DC converter, and the plurality of switches (S 1A -S mB, S 1 -S m+1, RL1-RL6), and a control unit, configured to provide a plurality of control signals (SRL1-SRL6, S1c-S7c, S CC) to correspondingly control the plurality of switches (S 1A -S mB, S 1 -S m+1, RL1-RL6) and the circuit switch (S C). an isolated DC/DC converter, an input side of the isolated DC/DC converter coupled in parallel to an input side of each of the switches (S 1A -S mB, S 1 -S m+1, RL1-RL6), and an output side of the isolated DC/DC converter coupled to a battery link (L CELL), wherein the plurality of battery cells (Cell 1-Cell m, Cell 1-Cell 6) are connected in series to form a battery link (L CELL), a circuit switch (S C), coupled between the AC/DC converter, the isolated DC/DC converter, and the plurality of switches (S 1A -S mB, S 1 -S m+1, RL1-RL6), and a control unit, configured to provide a plurality of control signals (SRL1-SRL6, S1c-S7c, S CC) to correspondingly control the plurality of switches (S 1A -S mB, S 1 -S m+1, RL1-RL6) and the circuit switch (S C).