The winding system has an electrode plate unwinding mechanism, a separator unwinding mechanism, a winding mandrel, a cutter, and an auxiliary wheel mechanism. The electrode plate unwinding mechanism is configured to unwind an electrode plate, the separator unwinding mechanism is configured to unwind a separator; the winding mandrel is configured to wind the electrode plate and the separator to form a winding core; the cutter is configured to cut the electrode plate and is arranged upstream of the winding mandrel; the auxiliary wheel mechanism is arranged downstream of the cutter, where the auxiliary wheel mechanism includes an auxiliary wheel, a first drive member, and a second drive member, the first drive member is configured to drive the auxiliary wheel to move closer to or away from the electrode plate. The second drive member is configured to drive the auxiliary wheel to rotate to adjust the tension of the electrode plate.