ELECTRODE ASSEMBLY AND RELATED BATTERY CELL, BATTERY, APPARATUS AND MANUFACTURING METHOD THEREFOR

1 . An electrode assembly, comprising:

a first electrode sheet and a second electrode sheet having opposite polarities; and

a separator to separate the first electrode sheet and the second electrode sheet, the separator comprising at least two layers,

wherein the first electrode sheet, the second electrode sheet and the separator are wound to form the electrode assembly.

2 . The electrode assembly according to claim 1 , wherein the separator comprises a first separator and a second separator, and the second separator is a folding part formed at an end of the first separator.

3 . The electrode assembly according to claim 2 , wherein the electrode assembly comprises a starting segment along a winding direction, and the end of the first separator is located in the starting segment.

4 . The electrode assembly according to claim 3 , wherein the electrode assembly comprises a bending region formed by winding and bending the first electrode sheet, the second electrode sheet and the separator, the bending region comprises a first bending position close to the starting segment along the winding direction, the first bending position is provided with the first separator and the second separator, and the first separator and the second separator extend from the starting segment to exceed the first bending position.

5 . The electrode assembly according to claim 1 , wherein the electrode assembly comprises a bending region formed by winding and bending the first electrode sheet, the second electrode sheet and the separator, the bending region comprises a plurality of bending positions along a winding direction, the separator comprises a first separator and a second separator, and the first separator and the second separator are stacked at at least one of the plurality of bending positions.

6 . The electrode assembly according to claim 5 , wherein second separators are arranged at intervals along the winding direction.

7 . The electrode assembly according to claim 5 , wherein the electrode assembly comprises a starting segment along the winding direction, the plurality of bending positions comprise a first bending position and a second bending position, the first bending position is closer to the starting segment than the second bending position, the first separator and the second separator are disposed at the first bending position and the second bending position, and a thickness of a part of the second separator located at the first bending position is greater than a thickness of a part of the second separator located at the second bending position.

8 . The electrode assembly according to claim 5 , wherein the second separator is bonded to a surface of the first separator.

9 . The electrode assembly according to claim 5 , wherein the first separator comprises two surfaces along a thickness direction, and second separators are located on a same surface of the first separator.

10 . The electrode assembly according to claim 5 , wherein the first separator and the second separator have different thicknesses.

11 . A manufacturing method for an electrode assembly, comprising:

providing a first electrode sheet and a second electrode sheet having different polarities, as well as a separator configured to separate the first electrode sheet and the second electrode sheet, wherein the separator comprises at least two layers; and

winding the first electrode sheet, the second electrode sheet and the separator to form the electrode assembly.

12 . The manufacturing method according to claim 11 , wherein the separator comprises a first separator and a second separator, and the providing the separator comprises: folding from an end of the first separator to form the second separator, to form the separator comprising at least two layers.

13 . The manufacturing method according to claim 11 , wherein the separator comprises a first separator and a second separator, and the providing the separator comprises: bonding the second separator to a preset position on a surface of the first separator, to form the separator comprising at least two layers.

14 . A battery cell, comprising the electrode assembly according to claim 1 .

15 . A battery, comprising the battery cell according to claim 14 .

16 . A power consumption apparatus, comprising the battery according to claim 15 , the battery being configured to provide electric energy.