INSULATOR, END COVER ASSEMBLY, BATTERY CELL, BATTERY AND ELECTRICAL DEVICE

1 . An insulator, used for a battery cell, comprising:

an insulator body, having a first surface and a second surface oppositely disposed in a thickness direction of the insulator body, the first surface facing an electrode assembly of the battery cell, and the second surface facing away from the electrode assembly; and

a protrusion, formed on the first surface and used for abutting against the electrode assembly;

wherein the protrusion is provided with an air vent, and the air vent runs through the protrusion in a direction intersecting with the thickness direction.

2 . The insulator according to claim 1 , wherein the protrusion comprises a bottom surface and an outer peripheral surface, the bottom surface is used to abut against the electrode assembly, the outer peripheral surface is disposed around the bottom surface, the outer peripheral surface connects the bottom surface with the first surface, and the air vent is disposed in the outer peripheral surface.

3 . The insulator according to claim 2 , wherein the protrusion extends in a first direction, the air vent runs through the protrusion in a second direction perpendicular to the first direction, and the first direction and the second direction are both parallel to the first surface.

4 . The insulator according to claim 3 , wherein the air vent is one of a plurality of air vents provided at the protrusion, and the plurality of air vents are disposed at intervals in the first direction.

5 . The insulator according to claim 3 , wherein the protrusion is one of a plurality of protrusions of the insulator, and the plurality of protrusions are disposed at intervals in the second direction.

6 . The insulator according to claim 5 , wherein the insulator body is a rectangular plate, the second direction is a length direction of the insulator body, the protrusions comprise a first protrusion, a second protrusion and a third protrusion, the first protrusion and the third protrusion are located at both ends of the insulator body in the length direction, and the second protrusion is located between the first protrusion and the third protrusion.

7 . The insulator according to claim 6 , wherein the second protrusion is of a hollow structure, the second surface is provided with an opening communicating with the interior of the second protrusion, and the air vent in the second protrusion communicates with the interior of the second protrusion.

8 . The insulator according to claim 7 , wherein the second surface is provided with a groove for avoiding a pressure relief mechanism of the battery cell, and the groove at least partially overlaps with the opening.

9 . An end cover assembly, used for a battery cell, comprising:

an end cover;

an electrode terminal, disposed on the end cover;

a pressure relief mechanism, disposed on the end cover, and configured to release an internal pressure of the battery cell when the internal pressure reaches a threshold value; and

the insulator according to claim 1 , the insulator being disposed on one side of the end cover facing the interior of the battery cell.

10 . The end cover assembly according to claim 9 , wherein the insulator body is in the shape of cuboid, the protrusion comprises a second protrusion, the second protrusion is disposed in the middle of the insulator body, the second protrusion extends in the width direction of the insulator body, the air vent runs through the second protrusion in the length direction of the insulator body, the second protrusion is of a hollow structure, the second surface is provided with an opening communicating with the interior of the second protrusion, the air vent in the second protrusion communicates with the interior of the second protrusion, the pressure relief mechanism is disposed on a position of the end cover corresponding to the second protrusion, and in the thickness direction, a projection of the pressure relief mechanism at least partially overlaps with a projection of the opening.

11 . The end cover assembly according to claim 9 , wherein the second surface is provided with a positioning portion, the end cover is provided with a positioning hole corresponding to the positioning portion, and the positioning portion is inserted in the positioning hole.

12 . A battery cell, comprising:

a case, having an end opening;

an electrode assembly, disposed in the case; and

the end cover assembly according to claim 9 , wherein the end cover covers the end opening, and the protrusion abuts against the electrode assembly.

13 . The battery cell according to claim 12 , further comprising:

an insulating film, wrapped outside the electrode assembly for insulating and isolating the electrode assembly from the case, wherein the insulating film is connected with the protrusion, the insulating film is provided with a notch, and the notch is disposed corresponding to the air vent, so that gas generated inside the battery cell enters the air vent through the notch.

14 . The battery cell according to claim 13 , wherein the insulating film is in hot melt connection with the protrusion.

15 . A battery, comprising the battery cell according to claim 12 .

16 . An electrical device, comprising the battery cell according to claim 12 .

17 . A manufacturing method of a battery cell, comprising:

providing a case, wherein the case has an end opening;

providing an electrode assembly;

providing an end cover assembly, wherein the end cover assembly comprises an end cover, an electrode terminal, a pressure relief mechanism and an insulator, the electrode terminal is disposed on the end cover, the pressure relief mechanism is disposed on the end cover, the pressure relief mechanism is configured to release an internal pressure of the battery cell when the internal pressure reaches a threshold value, the insulator is disposed on the end cover, the insulator comprises an insulator body and a protrusion, the insulator body has a first surface and a second surface oppositely disposed in a thickness direction of the insulator body, the protrusion is formed on the first surface, the protrusion is provided with an air vent, and the air vent runs through the protrusion in a direction intersecting with the thickness direction;

placing the electrode assembly in the case; and

covering the end opening with the end cover, so that the insulator is located on one side of the end cover facing the interior of the battery cell, and the protrusion abuts against the electrode assembly.

18 . Manufacturing equipment for a battery cell, comprising:

a providing module, configured to provide a case, provide an electrode assembly and provide an end cover assembly, wherein the case has an end opening, the end cover assembly comprises an end cover, an electrode terminal, a pressure relief mechanism and an insulator, the electrode terminal is disposed on the end cover, the pressure relief mechanism is disposed on the end cover, the pressure relief mechanism is configured to release an internal pressure of the battery cell when the internal pressure reaches a threshold value, the insulator is disposed on the end cover, the insulator comprises an insulator body and a protrusion, the insulator body has a first surface and a second surface oppositely disposed in a thickness direction of the insulator body, the protrusion is formed on the first surface, the protrusion is provided with an air vent, and the air vent runs through the protrusion in a direction intersecting with the thickness direction; and

an installing module, configured to place the electrode assembly in the case, and cover the end opening with the end cover, so that the insulator is located on one side of the end cover facing the interior of the battery cell, and the protrusion abuts against the electrode assembly.