| 主权项 |
1. A charging and discharging system comprising:
a first cell assembly comprising a first cell, a first connecting piece, and a second connecting piece; a second cell assemble comprising a second cell, a third connecting piece, and a fourth connecting piece; and a circuit board comprising a positive end, a coupling end, and a grounded end; wherein the first connecting piece, a positive pole of the first cell, and the positive end are connected in series; the second connecting piece, a negative pole of the first cell, and the coupling end are connected in series; the third connecting piece, a positive end of the second cell, and the coupling end are connected in series; the fourth connecting piece, a negative end of the second cell, and the grounded end are connected in series; a length of the third connecting piece and the fourth connecting piece is greater than that of the first connecting piece and the second connecting piece; and a resistivity of the third connecting piece and the fourth connecting piece is less than that of the first connecting piece and the second connecting piece. |
