A device for preparing an electrode assembly, comprising: a winding assembly; a plurality of first electrode plate unwinding apparatuses, configured to provide a plurality of first electrode plates for the winding assembly; and at least one second electrode plate unwinding apparatus, configured to provide at least one second electrode plate for the winding assembly, wherein a polarity of the first electrode plate is opposite to a polarity of the second electrode plate; and wherein the winding assembly is configured to wind the plurality of first electrode plates and the at least one second electrode plate to form an electrode assembly. further comprising a plurality of separator unwinding apparatuses configured to provide a plurality of separators for the winding assembly, the separators configured to isolate the first electrode plates from the second electrode plates; the winding assembly comprises a winding core, and the winding core is configured to wind the plurality of first electrode plates, the at least one second electrode plate and the plurality of separators; wherein the winding assembly further comprises a switching apparatus, the winding core is arranged on the switching apparatus, and the switching apparatus is configured to switch the winding core between a loading station and an unloading station; and the device for preparing an electrode assembly further comprising: a first cutter, configured to cut off at least one separator in the plurality of separators and retain at least one separator when the winding core winds the electrode assembly for a predetermined number of turns; and a second cutter, configured to cut off the at least one retained separator when the winding core is at the unloading station. a winding assembly; a plurality of first electrode plate unwinding apparatuses, configured to provide a plurality of first electrode plates for the winding assembly; and at least one second electrode plate unwinding apparatus, configured to provide at least one second electrode plate for the winding assembly, wherein a polarity of the first electrode plate is opposite to a polarity of the second electrode plate; and wherein the winding assembly is configured to wind the plurality of first electrode plates and the at least one second electrode plate to form an electrode assembly. further comprising a plurality of separator unwinding apparatuses configured to provide a plurality of separators for the winding assembly, the separators configured to isolate the first electrode plates from the second electrode plates; the winding assembly comprises a winding core, and the winding core is configured to wind the plurality of first electrode plates, the at least one second electrode plate and the plurality of separators; wherein the winding assembly further comprises a switching apparatus, the winding core is arranged on the switching apparatus, and the switching apparatus is configured to switch the winding core between a loading station and an unloading station; and the device for preparing an electrode assembly further comprising: a first cutter, configured to cut off at least one separator in the plurality of separators and retain at least one separator when the winding core winds the electrode assembly for a predetermined number of turns; and a second cutter, configured to cut off the at least one retained separator when the winding core is at the unloading station. a first cutter, configured to cut off at least one separator in the plurality of separators and retain at least one separator when the winding core winds the electrode assembly for a predetermined number of turns; and a second cutter, configured to cut off the at least one retained separator when the winding core is at the unloading station.