Device for preparing electrode assembly and preparation method of electrode assembly

1. 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;

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;

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,

wherein 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, and

wherein the winding assembly further comprises a switching apparatus, the winding core being arranged on the switching apparatus, and the switching apparatus being configured to switch the winding core between a first station and a second station;

a first cutter, arranged at the first station and configured to cut off some of the separators and retain at least one separator when the winding core winds the electrode assembly for a predetermined number of turns at the first station; and

a second cutter, arranged between the first station and the second station and configured to cut off the at least one retained separator when the winding core is at the second station,

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 tape attaching mechanism arranged at the second station and configured to attach an ending tape on the winding structure after the winding is finished.

2. The device for preparing an electrode assembly according to claim 1 , wherein the winding core is provided with at least one negative pressure opening to adsorb a winding initial section of at least one separator in the plurality of separators; the at least one negative pressure opening comprises a concave hole or a penetrating hole arranged on a winding surface of the winding core; the at least one negative pressure opening is triangular, circular, square or of irregular shapes.

3. The device for preparing an electrode assembly according to claim 2 , wherein the negative pressure openings are distributed in an array on the winding surface of the winding core.

4. The device for preparing an electrode assembly according to claim 1 , further comprising:

a press roller, configured to press a winding initial section of at least one separator in the plurality of separators towards the winding core; and

a spraying and blowing mechanism, configured to blow an end part of the winding initial section onto the surface of the winding core, such that the winding core winds the winding initial section, to drive the plurality of first electrode plates, the at least one second electrode plate and the plurality of separators to be wound.

5. The device for preparing an electrode assembly according to claim 1 , further comprising a first loading piece configured to feed a winding initial section of at least one separator in the plurality of separators into the winding core.

6. The device for preparing an electrode assembly according to claim 5 , further comprising a second loading piece configured to clamp at least one cut-off separator when at least one separator in the plurality of separators is cut off.

7. The device for preparing an electrode assembly according to claim 1 , further comprising:

a plurality of first compound mechanisms, wherein each first compound mechanism in the plurality of first compound mechanisms is configured to compound one first electrode plate in the plurality of first electrode plates and one separator in the plurality of separators into a first compound electrode plate;

at least one second compound mechanism, wherein each second compound mechanism in the at least one second compound mechanism is configured to compound one second electrode plate in the at least one second electrode plate and another separator in the plurality of separators into a second compound electrode plate, and

the winding assembly is configured to wind all the first compound electrode plates and all the second compound electrode plates to form an electrode assembly.

8. The device for preparing an electrode assembly according to claim 1 , further comprising at least one third compound mechanism, and each third compound mechanism in the at least one third compound mechanism is configured to compound one first electrode plate in the plurality of first electrode plates, one second electrode plate in the at least one second electrode plate and two separators in the plurality of separators into a third compound electrode plate; and

the winding assembly is configured to wind all the third compound electrode plates to form an electrode assembly.

9. The device for preparing an electrode assembly according to claim 1 , further comprising a fourth compound mechanism configured to compound the plurality of first electrode plates, the at least one second electrode plate and the plurality of separators into a fourth compound electrode plate, and the winding assembly is configured to wind the fourth compound electrode plate to form an electrode assembly.

10. A preparation method of an electrode assembly with the device according to claim 1 , the method comprising:

providing a plurality of first electrode plates;

providing at least one second electrode plate, wherein a polarity of the first electrode plate is opposite to a polarity of the second electrode plate; and

winding the plurality of first electrode plates and at least one second electrode plate to form an electrode assembly.

11. The preparation method of an electrode assembly according to claim 10 , further comprising: providing a plurality of separators, wherein the separators are configured to isolate the first electrode plate from the second electrode plate.

12. The preparation method of an electrode assembly according to claim 11 , further comprising:

absorbing a winding initial section of at least one separator in the plurality of separators, and

winding the plurality of first electrode plates, the at least one second electrode plate and the plurality of separators.

13. The preparation method of an electrode assembly according to claim 11 , wherein after a winding initial section of at least one separator in the plurality of separators is fed into a winding core of a winding assembly for a certain length, remaining separators in the plurality of separators are fed into the winding core and driven by the at least one separator to be wound.

14. The preparation method of an electrode assembly according to claim 11 , further comprising:

each first compound mechanism in a plurality of first compound mechanisms compounds one first electrode plate in the plurality of first electrode plates and one separator in the plurality of separators into a first compound electrode plate;

each second compound mechanism in at least one second compound mechanism compounds one second electrode plate in the at least one second electrode plate and another separator in the plurality of separators into a second compound electrode plate; and

a winding assembly winds all the first compound electrode plates and all the second compound electrode plates to form an electrode assembly.

15. The preparation method of an electrode assembly according to claim 11 , further comprising:

each third compound mechanism in at least one third compound mechanism compounds one first electrode plate in the plurality of first electrode plates, one second electrode plate in the at least one second electrode plate and two separators in the plurality of separators into a third compound electrode plate; and

a winding assembly winds all the third compound electrode plates to form an electrode assembly.

16. The preparation method of an electrode assembly according to claim 11 , further comprising:

a fourth compound mechanism compounds the plurality of first electrode plate, at least one second electrode plate and the plurality of separators into a fourth compound electrode plate, and

a winding assembly winds the fourth compound electrode plate to form an electrode assembly.