Winding method, winding machine, electrode assembly, and battery cell

1. A winding method for winding a cathode plate, an anode plate and a separator to form an electrode assembly, the winding method comprising:

clamping heads of the cathode plate, the anode plate and the separator between a first half winding needle and a second half winding needle of a winding needle assembly at a winding station;

rotating the winding needle assembly at the winding station to wind the cathode plate, the anode plate and the separator to form the electrode assembly;

cutting off only the cathode plate at the upstream of the winding station;

moving the winding needle assembly from the winding station to a downstream non-winding station;

moving a further winding needle assembly located at the non-winding station to the winding station;

the further winding needle assembly located at the winding station clamping the heads of the cathode plate, the anode plate and the separator to form a next electrode assembly; and

cutting off the anode plate and the separator between the winding station and the non-winding station.

2. The winding method according to claim 1 , further comprising:

feeding the head of the cut cathode plate between the first half winding needle and the second half winding needle of the further winding needle assembly located at the winding station.

3. The winding method according to claim 1 , further comprising:

a clamping and feeding structure jointly clamping, at the upstream of the winding station, the heads of the cathode plate, the anode plate and the separator, and feeding the heads between the first half winding needle and the second half winding needle.

4. The winding method according to claim 3 , further comprising:

after the heads of the cathode plate, the anode plate and the separator are fed between the first half winding needle and the second half winding needle, a telescoping structure driving the clamping and feeding structure that clamps the cathode plate, the anode plate and the separator to shift in a first direction, wherein the direction in which the heads of the cathode plate, the anode plate and the separator are fed between the first half winding needle and the second half winding needle is a second direction, and the first direction intersects with the second direction.

5. The winding method according to claim 3 , further comprising:

at the downstream of the clamping and feeding structure, a first guide roller guiding the anode plate and the separator; and

the first half winding needle and the second half winding needle extending out to two sides of the anode plate and the separator;

wherein the direction in which the cathode plate, the anode plate and the separator are fed between the first half winding needle and the second half winding needle is a second direction, and an outer peripheral surface of the first guide roller is tangent to the second direction.

6. The winding method according to claim 1 , wherein before the step of clamping the heads of the cathode plate, the anode plate and the separator between a first half winding needle and a second half winding needle of a winding needle assembly at a winding station, the winding method further comprises:

compounding the cathode plate, the anode plate and the separator.

7. An electrode assembly, wherein the electrode assembly is manufactured using the winding method according to claim 1 .

8. The electrode assembly according to claim 7 , wherein the electrode assembly comprises:

a cathode plate, an anode plate and a separator, a head of the anode plate being flush with a head of the separator, wherein a tail of the anode plate is flush with a tail of the separator.

9. A battery cell, comprising the electrode assembly according to claim 7 .

10. A winding machine, comprising:

a winding structure which comprises a winding needle assembly, wherein the winding needle assembly winds a cathode plate, an anode plate and a separator to form an electrode assembly, and the winding needle assembly comprises a first half winding needle and a second half winding needle, the first half winding needle and the second half winding needle being configured to be relatively movable to clamp heads of the cathode plate, the anode plate and the separator,

wherein the first half winding needle comprises a first plane; the second half winding needle comprises a second plane; the first plane and the second plane are planes for clamping the cathode plate, the anode plate and the separator; and

a notch is formed in an end of the first plane or the second plane, the notch obtained by cutting out a part of a structure of the first half winding needle or the second half winding needle.

11. The winding machine according to claim 10 , further comprising:

a clamping and feeding structure that is arranged upstream of the winding structure to clamp the heads of the cathode plate, the anode plate and the separator and feed the heads between the first half winding needle and the second half winding needle.

12. The winding machine according to claim 11 , wherein the clamping and feeding structure comprises a first clamping roller, a second clamping roller and a driving structure, wherein the first clamping roller and the second clamping roller are relatively movable to clamp the cathode plate, the anode plate and the separator, and the first clamping roller and/or the second clamping roller is connected to the driving structure so as to transfer the cathode plate, the anode plate and the separator.

13. The winding machine according to claim 11 , further comprising:

a telescoping structure connected to the clamping and feeding structure to drive the clamping and feeding structure to move in a first direction after the cathode plate, the anode plate and the separator are fed between the first half winding needle and the second half winding needle; wherein the direction in which the cathode plate, the anode plate and the separator are fed between the first half winding needle and the second half winding needle is a second direction, and the first direction intersects with the second direction.

14. The winding machine according to claim 11 , further comprising:

a first guide roller that is arranged between the clamping and feeding structure and the winding needle assembly.

15. The winding machine according to claim 14 , wherein the direction in which the cathode plate, the anode plate and the separator are fed between the first half winding needle and the second half winding needle is a second direction, and an outer peripheral surface of the first guide roller is tangent to the second direction.

16. The winding machine according to claim 10 , further comprising:

a first cutter to cut off the cathode plate, wherein the first cutter is arranged upstream of the winding structure.

17. The winding machine according to claim 10 , wherein the winding structure further comprise a rotating tower, wherein a plurality of the winding needle assemblies are arranged on the rotating tower to cause the plurality of winding needle assemblies to switch between the winding station and the non-winding station, and the winding needle assemblies at the winding station winds the cathode plate, the anode plate and the separator to form the electrode assembly.

18. The winding machine according to claim 17 , further comprising a second cutter to cut off the anode plate and the separator, and the second cutter is arranged between the winding station and the non-winding station, the winding machine further comprising a second guide roller, the second guide roller being located between the winding station and the non-winding station, wherein the direction in which the cathode plate, the anode plate and the separator are fed between the first half winding needle and the second half winding needle is the second direction, and the second guide roller is tangent to the second direction.