Electrode plate, electrode assembly containing same, and battery

1 . An electrode assembly, comprising a first electrode plate, a second electrode plate, and a separator located between the first electrode plate and the second electrode plate;

wherein the first electrode plate, the separator, and the second electrode plate are stacked and wound to form an electrode assembly,

wherein the first electrode plate comprises:

an electrode plate body, a tab, a first adhesive layer, and a second adhesive layer; wherein the tab comprises a connecting portion and an extending portion connected to the connecting portion, the connecting portion overlaps with the electrode plate body and is connected to the electrode plate body, the extending portion protrudes from the connecting portion out of one side of the electrode plate body along a first direction, and the first adhesive layer is disposed on the extending portion; wherein,

the second adhesive layer comprises a first part and a second part, the first part is bonded to a surface of the electrode plate body and covers the connecting portion, the second part is formed by extending the first part from a side of the first part disposed towards the first adhesive layer along the first direction and is bonded to the first adhesive layer; and, in a second direction approximately perpendicular to the first direction, a width of the second part is less than a width of the first part;

wherein the electrode assembly comprises a bend region, and a protruding section of the first part extending beyond the second part in the second direction is disposed in the bend region.

2 . The electrode assembly according to claim 1 , wherein the second part is directly bonded to the first adhesive layer, or the second part is indirectly bonded to the first adhesive layer through a transition section, wherein the transition section is formed by extending the second part along the first direction.

3 . The electrode assembly according to claim 2 , wherein along the second direction, a width of the transition section is identical to the width of the first part, or the width of the transition section is identical to the width of the second part.

4 . The electrode assembly according to claim 1 , wherein in the first direction, the second part at least partly extends beyond the electrode plate body.

5 . The electrode assembly according to claim 1 , wherein a junction between the first part and the second part is chamfered.

6 . The electrode assembly according to claim 1 , wherein the tab comprises two extending portions, the two extending portions are disposed on two opposite sides of the electrode plate body respectively, the second adhesive layer comprises two second parts, and the two second parts are disposed on two opposite sides of the first part respectively.

7 . The electrode assembly according to claim 1 , wherein the second adhesive layer further comprises a third part, the third part is formed by extending the second part along the second direction, the third part is bonded to the first adhesive layer.

8 . The electrode assembly according to claim 7 , wherein the third part is connected to the first part, and a plurality of gaps are disposed at intervals at a junction between the third part and the first part to form a pre-cut-off structure at the junction.

9 . The electrode assembly according to claim 1 , wherein the second part is disposed in a middle region of the first part, so that the first part extends beyond the second part at both ends along the second direction.

10 . The electrode assembly according to claim 8 , wherein the third part is separated from the first part.

11 . A battery, wherein the battery comprises the electrode assembly according to claim 1 .