Electrode plate, electrode assembly, battery cell, battery, and electric device
An electrode plate includes a current collector. The current collector includes a conductive layer and an insulating layer. The conductive layer includes a tab portion. In thickness direction of the electrode plate, the conductive layer is provided at two opposite sides of the insulating layer. The insulating layer includes a first region and a second region, and in width direction of the electrode plate, at least one end of the first region is connected to the second region. Thickness of the second region is less than thickness of the first region, and the tab portion is at least partially disposed in the second region. The electrode plate further includes an active substance layer applied on a surface of the conductive layer facing away from the insulating layer. The tab portion is not coated with the active substance layer.
1. An electrode plate, comprising:
a current collector comprising a conductive layer and an insulating layer, wherein:
in thickness direction of the electrode plate, the conductive layer is provided at two opposite sides of the insulating layer;
the insulating layer comprises a first region and a second region, thickness of the second region being less than thickness of the first region, and in width direction of the electrode plate, at least one end of the first region being connected to the second region; and
the conductive layer comprises a tab portion, the tab portion being at least partially A disposed in the second region;
an active substance layer applied on a surface of the conductive layer facing away from the insulating layer, the tab portion being not coated with the active substance layer;
the conductive layer comprises a coating portion, the coating portion being disposed in the first region;
at least a portion of the active substance layer is applied to a side of the coating portion facing away from the first region; and
a surface of the coating portion facing away from the first region and a surface of the tab portion facing away from the second region are co-planar.
2. The electrode plate according to claim 1 , wherein the insulating layer further comprises a first transition zone, the first transition zone connecting the first region and the second region, and thickness of the first transition zone gradually decreasing in a direction from the first region to the second region.
3. The electrode plate according to claim 1 , wherein:
the conductive layer further comprises a coating portion, the coating portion being disposed in the first region;
at least a portion of the active substance layer is applied to a side of the coating portion facing away from the first region; and
thickness of the coating portion is less than thickness of the tab portion.
4. The electrode plate according to claim 1 , wherein:
the insulating layer further comprises a first transition zone, the first transition zone connecting the first region and the second region, and thickness of the first transition zone gradually decreasing in a direction from the first region to the second region; and
the conductive layer further comprises a second transition zone, the second transition zone being disposed in the first transition zone, and thickness of the second transition zone gradually increasing in the direction from the first region to the second region.
5. The electrode plate according to claim 4 , wherein a surface of the second transition zone facing away from the first transition zone and a surface of the tab portion facing away from the second region are co-planar.
6. The electrode plate according to claim 1 , wherein in the width direction of the electrode plate, two ends of the first region are connected to the second region.
7. The electrode plate according to claim 1 , wherein:
the conductive layer has a first surface facing away from the insulating layer, the first surface extending to two ends of the current collector along the width direction of the electrode plate; and
in the thickness direction of the electrode plate, the first surfaces of the conductive layers at the two opposite sides of the insulating layer are parallel.
8. The electrode plate according to claim 1 , wherein the conductive layer further comprises a coating portion, the coating portion being disposed in the first region, and in the thickness direction of the electrode plate, the active substance layer is provided on a side of the coating portion, facing away from the insulating layer, of the conductive layer at the two sides of the insulating layer.
9. The electrode plate according to claim 1 , wherein when viewed from the thickness direction of the electrode plate, a projection of the active substance layer overlaps a projection of the second region.
10. The electrode plate according to claim 1 , wherein thickness H 1 of the second region and thickness L 1 of the tab portion satisfy H 1 /L 1 ≤5.
11. The electrode plate according to claim 10 , wherein H 1 /L 1 ≤1.
12. The electrode plate according to claim 1 , wherein the conductive layer further comprises a coating portion, the coating portion being disposed in the first region, and thickness H 2 of the first region and thickness L 2 of the coating portion satisfy 1≤H 2 /L 2 ≤50.
13. The electrode plate according to claim 12 , wherein 2≤H 2 /L 2 ≤20.
14. An electrode assembly comprising the electrode plate according to claim 1 .
15. The electrode assembly according to claim 14 , wherein the electrode plate is one of two electrode plates having opposite polarities.
16. A battery cell comprising the electrode assembly according to claim 14 .
17. The battery cell according to claim 16 , further comprising:
an adapter;
wherein in thickness direction of the electrode plate, the tab portions of the conductive layer located at two sides of the second region are welded to the adapter.
18. A battery comprising the battery cell according to claim 16 .
19. An electric device comprising the battery according to claim 18 .