Tab coating device

1 . A tab coating device, configured to coat an end face of a tab of an electrode assembly with an insulating film, wherein the tab coating device comprises:

a sleeve, configured to be arranged on an outer peripheral surface of the electrode assembly in a sleeving mode, wherein the sleeve is provided with a guide hole;

a shaping piece, configured to move along an axial direction of the sleeve and extend into the sleeve to flatten a part of the insulating film that exceeds the end face of the tab on the end face of the tab;

a base, wherein the shaping piece is fixedly arranged on the base, the sleeve is movably arranged on the base along its axial direction, the shaping piece is located between the base and the sleeve;

a resilient member arranged between the sleeve and the base and configured to apply an elastic force in a direction away from the base to the sleeve; and

a guide pillar passing through the guide hole and slidably coordinated with the sleeve along the axial direction of the sleeve, wherein one end of the guide pillar is fixed to the base, and the resilient member is arranged on the guide pillar in a sleeving mode.

2 . The tab coating device according to claim 1 , wherein

an inner wall of the sleeve is formed with a protrusion, and the protrusion is configured to guide the part of the insulating film that exceeds the end face of the tab to incline toward a central axis of the electrode assembly.

3 . The tab coating device according to claim 2 , wherein

the protrusion extends along a circumferential direction of the sleeve.

4 . The tab coating device according to claim 2 , wherein

the protrusion has a protrusion height H, which satisfies: 2 mm≤H≤2.5 mm.

5 . The tab coating device according to claim 1 , wherein

the shaping piece is a heat-pressing shaping piece, and the heat-pressing shaping piece is configured to heat-press the part of the insulating film that exceeds the end face of the tab on the end face of the tab.

6 . The tab coating device according to claim 1 , wherein

the tab coating device further comprises:

a limiting part that protrudes from a surface of the base facing the sleeve, which is configured to press against a surface of the sleeve facing the base.

7 . The tab coating device according to claim 1 , wherein

the shaping piece comprises a pressure plate and a connecting rod, and the connecting rod is oriented perpendicularly to the pressure plate; and one end of the connecting rod is connected to the pressure plate, while the other end is connected to the base.

8 . The tab coating device according to claim 7 , wherein

the pressure plate comprises a supporting disc and a heating sheet, and the supporting disc is connected to the connecting rod; and

the heating sheet is arranged on a surface of the supporting disc away from the connecting rod; and the heating sheet is configured to heat-press the part of the insulating film that exceeds the end face of the tab onto the end face of the tab.

9 . The tab coating device according to claim 8 , wherein

the heating sheet is disc-shaped, and a center of the heating sheet forms a positioning hole; and

the supporting disc is formed with a protrusion block, and the protrusion block is inserted into the positioning hole.

10 . The tab coating device according to claim 2 , wherein

the sleeve comprises a first cylinder and a second cylinder, along an axial direction of the sleeve, the first cylinder and the second cylinder are connected to each other, wherein the second cylinder, compared with the first cylinder, is closer to the shaping piece; and

the protrusion is formed on an inner wall of the second cylinder.

11 . The tab coating device according to claim 10 , wherein

the first cylinder comprises a cylindrical part and a flange plate; the flange plate, along a radial direction, protrudes from one end of the cylindrical part beyond an outer peripheral surface of the cylindrical part; and the second cylinder is disc-shaped, and the flange plate is connected to the second cylinder with a fastener.

12 . A tab coating device, configured to coat an end face of a tab of an electrode assembly with an insulating film, wherein the tab coating device comprises:

a base;

a sleeve configured to be arranged on an outer peripheral surface of the electrode assembly in a sleeving mode and movably arranged on the base along an axial direction; and

a shaping piece located between the base and the sleeve, wherein the shaping piece is fixedly arranged on the base and configured to move along an axial direction of the sleeve and extend into the sleeve to flatten a part of the insulating film that exceeds the end face of the tab on the end face of the tab,

wherein the shaping piece comprises a pressure plate and a connecting rod, the connecting rod is oriented perpendicularly to the pressure plate and has two ends, one end is connected to the pressure plate, the other end is connected to the base, the pressure plate comprises a heating sheet and a supporting disc connected to the connecting rod,

wherein the heating sheet is arranged on a surface of the supporting disc away from the connecting rod and configured to heat-press a part of the insulating film that exceeds the end face of the tab onto the end face of the tab, the heating sheet is disc-shaped, a center of the heating sheet forms a positioning hole, the supporting disc is formed with a protrusion block inserted into the positioning hole.

13 . A tab coating device, configured to coat an end face of a tab of an electrode assembly with an insulating film, wherein the tab coating device comprises:

a sleeve configured to be arranged on an outer peripheral surface of the electrode assembly in a sleeving mode; and

a shaping piece, configured to move along an axial direction of the sleeve and extend into the sleeve to flatten a part of the insulating film that exceeds the end face of the tab on the end face of the tab,

wherein the sleeve comprises a first cylinder and a second cylinder connected to each other, the second cylinder along an axial direction of the sleeve, the second cylinder is closer to the shaping piece compared with the first cylinder, an inner wall of the second cylinder of the sleeve is formed with a protrusion configured to guide the part of the insulating film that exceeds the end face of the tab to incline toward a central axis of the electrode assembly,

wherein the first cylinder comprises a cylindrical part and a flange plate, the flange plate, along a radial direction, protrudes from one end of the cylindrical part beyond an outer peripheral surface of the cylindrical part; the second cylinder is disc-shaped, the flange plate is connected to the second cylinder with a fastener.