Cap welding machine

Abstract

The utility model relates to welding between a tab and a cover plate in the field of battery cells, in particular to a cap welding machine, which is characterized in that a positioning area for positioning the battery cells on a jig corresponds to a laser beam, and an elastic part for dragging a positioning part to move towards a steel shell positioning table, and comprises the jig capable of adapting to the battery cells with different sizes, the jig is composed of two parts, namely an elastic part and a positioning part, the positioning part is matched with a steel shell positioning table to form a clamping posture to fix a steel shell, elastic force provided by the elastic part is used for dragging the positioning part, and pulling force towards the direction of the steel shell positioning table is continuously applied to the positioning part. In addition, steel shells of different sizes can still be clamped, so that the condition of adjusting the distance between the positioning part and the positioning part of the steel shell is met, and the problem that a large-size middle cover plate and a tab cannot be welded in the prior art is solved through better compatibility.

Description

TECHNICAL FIELD

[0001] The utility model relates to the welding between the tab and the cover plate in the field of battery cell, especially a cap welding machine. BACKGROUND

[0002] In the process of welding, such as the welding between the cover plate and the tab, in the current production equipment, it is aimed at the mainstream and single model battery cell, such as 18650 and 21700, and these batteries have long use history. However, the development of battery cell is rapid at present, and under the condition that 46800 battery cell has not been popularized at present stage, 46950 battery cell is being researched, and the current production line cannot be compatible with the above size battery cell, and the welding between the cover plate and the tab of the large size battery cell cannot be carried out. SUMMARY

[0003] To solve the above problems, the utility model provides a cap welding machine which can adapt to battery cells of different sizes, and this better compatibility can also realize the welding between the cover plate and the tab when facing large size battery cell.

[0004] To achieve the above purpose, the utility model adopts the technical scheme of a cap welding machine which comprises a laser welding machine and a jig, the positioning area on the jig for positioning the battery cell corresponds to the laser beam, and the jig comprises an end cover positioning table and a steel shell positioning table, and a fastening mechanism, the fastening mechanism comprises a positioning part for fixing the steel shell positioning table in cooperation with the steel shell positioning table, and an elastic part for moving the dragging positioning part to the steel shell positioning table.

[0005] The utility model has the advantages of:

[0006] The utility model comprises a jig which can adapt to battery cells of different sizes, and the jig is composed of two parts, the elastic part and the positioning part, the positioning part is used for fixing the steel shell in cooperation with the steel shell positioning table to form a clamping posture, and the elastic part provides an elastic force for dragging the positioning part to continuously exert a pulling force on the positioning part to the steel shell positioning table, so that the steel shell of different sizes can still be clamped, and therefore, the utility model satisfies the condition of adjusting the distance between the positioning part and the steel shell positioning part, and better compatibility solves the problem that the existing technology cannot weld the cover plate and the tab of large size.

[0007] Specifically, the part for restraining the end cover on the end cover positioning table is provided with a notch with a diameter matched with the end cover on the side surface, the end cover is in the notch, and the left and right deviation of the end cover in the notch is avoided, and in addition, the purpose of the notch is to form a blocking effect on the end cover from another two directions by the tab on the upper end surface of the steel shell in the previous process, so that the end cover cannot fall off in the notch.

[0008] Specifically, the end cover positioning table is arranged above the steel shell positioning table, and the same side of the two respectively participates in the positioning of the end cover and the steel shell.

[0009] The positioning part comprises a positioning plate and a pull rod, the positioning plate is arranged on the steel shell positioning table through the pull rod, and the pull rod is in a movable relationship with the steel shell positioning table, the distance between the positioning plate and the steel shell positioning table can be adjusted by pulling the pull rod, the steel shell positioning table and the positioning plate are in a state of being opposite to each other, and the opposite faces of each other are arc faces matched with the steel shell, the elastic part comprises a limiting plate and a spring, the elastic part is located on the back of the steel shell positioning table, that is, the pull rod is connected with the limiting plate after penetrating through the steel shell positioning table, and the spring is sleeved on the pull rod and located between the limiting plate and the steel shell positioning table. The positioning mode provided by the structure can mainly reduce vibration or displacement generated in the use process, especially for accurate positioning between the tab and the end cover, and ensure that the stable state can be maintained during use.

[0010] Further, the positioning plate is provided with a nut, the nut serves as a handle, and the nut and the positioning plate are reliably connected. The connection is maintained while pulling, and the stability is also maintained.

[0011] The edge of the inner side of the steel shell positioning table is provided with a pulley, which reduces the friction between the steel shell and the steel shell positioning table and reduces the damage to the surface of the steel shell caused by friction.

[0012] In the embodiment, a vacuum dust collection assembly is further arranged between the jig and the laser welding machine, the vacuum dust collection assembly comprises a dust collection bin, the middle of the dust collection bin is an open structure, a laser beam passes through the open structure and is incident on the tab in contact with the end cover, the peripheral surface of the dust collection bin is provided with a vacuum extraction hole communicating with the open structure, the vacuum extraction hole is connected with a vacuum suction head, and the debris generated during welding is directly sucked away by negative pressure, thereby further controlling the environmental pollution of the working space.

[0013] Considering that the contact between the tab and the end cover is not sufficient, the vacuum dust collection assembly is arranged on the output end of the linear movement mechanism, and a spring-loaded nozzle is arranged on the back of the dust collection bin, the spring-loaded nozzle is a conical body, and the spring-loaded nozzle also has a through hole for the laser beam to pass through. Under the action of the linear movement mechanism, the whole vacuum adsorption assembly moves towards the end cover, and the spring-loaded nozzle exerts pressure on the end cover and the tab. The deformation of the spring-loaded nozzle makes the contact between the tab and the end cover more compact without damaging the tab and the end cover, and ensures that the connection between them will not be insufficient.

[0014] The cap welding machine also includes a worktable with a fixed base. The steel shell positioning table is fixed to the fixed base by pins, which reduces the adjustment process of the fixture and laser welding machine. Attached Figure Description

[0015] Figure 1 This is a 3D view of the battery cell assembly.

[0016] Figure 2 This is a perspective view of the present invention.

[0017] Figure 3 yes Figure 2 Enlarged diagram of point A.

[0018] Figure 4 It is a three-dimensional drawing of the jig.

[0019] Figure 5 yes Figure 4 An explosion diagram.

[0020] Figure 6 yes Figure 5 Enlarged diagram of point B.

[0021] Figure 7 It is an assembly drawing of the linear motion mechanism and the vacuum cleaning component. Detailed Implementation

[0022] like Figures 1-7 As shown, a cap welding machine includes a laser welding machine 2 and a fixture 1. The positioning area on the fixture 1 for positioning the battery cell corresponds to the laser beam. The fixture 1 includes an end cap positioning platform 10 and a steel shell positioning platform 11, as well as a fastening mechanism. The fastening mechanism includes a positioning part that cooperates with the steel shell positioning platform 11 to fix the steel shell positioning platform 11, and an elastic part that drags the positioning part to move towards the steel shell positioning platform 11.

[0023] The beneficial effects of this utility model are:

[0024] This utility model includes a fixture 1 that can adapt to battery cells of different sizes. This fixture 1 consists of two parts: an elastic part and a positioning part. The positioning part cooperates with the steel shell positioning platform 11 to fix the steel shell 3 in a clamping posture. The elastic part provides elastic force to drag the positioning part, continuously applying a pulling force towards the steel shell positioning platform 11. Under this design, steel shells 3 of different sizes can still be clamped. Therefore, this utility model satisfies the condition of adjusting the distance between the positioning part and the positioning part of the steel shell 3, and better compatibility solves the problem that the prior art cannot weld large-sized middle cover plates and electrode tabs 9.

[0025] Specifically, the part of the end cap positioning table 10 for restraining the end cap 4 is provided with a notch matching the diameter of the end cap 4 on its side surface, and the end cap 4 is in the notch and cannot be shifted left or right. In addition, the purpose of the notch is that, in the previous process, the tab 9 is processed to be relatively perpendicular to the upper end surface of the steel shell 3, so that, after the steel shell 3 and the end cap 4 are placed, the tab 9 on the upper end surface of the steel shell 3 and the inner surface of the notch form a blocking effect on the end cap 4 from the other two directions, so that the end cap 4 cannot fall off in the notch.

[0026] Specifically, the end cap positioning table 10 is arranged above the steel shell positioning table 11, and the same side surfaces of the two are respectively involved in the positioning of the end cap 4 and the steel shell 3.

[0027] The positioning part includes a positioning plate 1101 and a pull rod 1102. The positioning plate 1101 is arranged on the steel shell positioning table 11 through the pull rod 1102, and the pull rod 1102 is in a movable relationship with the steel shell positioning table 11. The distance between the positioning plate 1101 and the steel shell positioning table 11 can be adjusted by pulling the pull rod 1102. The steel shell positioning table 11 and the positioning plate 1101 are in a mutually opposite state, and the mutually opposite surfaces are arc surfaces matching the steel shell 3. The elastic part includes a limiting plate 1103 and a spring 1104. The elastic part is located on the back surface of the steel shell positioning table 11, that is, the pull rod 1102 is connected with the limiting plate 1103 after passing through the steel shell positioning table 11, and the spring 1104 is sleeved on the pull rod 1102 and located between the limiting plate 1103 and the steel shell positioning table 11. This structure provides a positioning method that can mainly reduce vibration or displacement generated during use, especially for precise positioning between the tab 9 and the end cap 4, to ensure that the stable state can be maintained during use.

[0028] Further, the positioning plate 1101 is provided with a nut 1105, which serves as a handle. The nut 1105 and the positioning plate 1101 are reliably connected, and the connection is maintained while pulling, thereby maintaining stability.

[0029] The edge of the inner side surface of the steel shell positioning table 11 is provided with a pulley 1106, which reduces the friction between the steel shell 3 and the steel shell positioning table 11 and reduces the damage to the surface of the steel shell 3 caused by friction.

[0030] In the embodiment, a vacuum cleaning assembly is further arranged between the jig 1 and the laser welding machine 2. The vacuum cleaning assembly includes a dust collection bin 5. The middle of the dust collection bin 5 is an open structure, and the inner side surface of the open structure is provided with a negative pressure port. The laser beam passes through the open structure and is incident on the tab 9 in contact with the end cap 4. The peripheral surface of the dust collection bin 5 is provided with a vacuum extraction hole communicating with the open structure. The vacuum extraction hole is connected with a vacuum suction head. The debris generated during welding is directly sucked away by the negative pressure port, and the environmental pollution of the working space is further controlled.

[0031] In consideration of the case that the contact between the lug 9 and the end cover 4 is not sufficient, the vacuum suction assembly is arranged on the output end of the linear moving mechanism 7, and the back of the suction bin 5 is provided with a spring-pressed nozzle 6 which is a conical body and also has a through hole 61 for the laser beam to pass through, under the action of the linear moving mechanism 7, the whole vacuum suction assembly moves towards the end cover 4, and the spring-pressed nozzle 6 exerts pressure on the end cover 4 and the lug 9, the deformation of the spring-pressed nozzle 6 can make the contact between the lug 9 and the end cover 4 more compact under the premise of not causing damage to the lug 9 and the end cover 4, and ensure that the connection between them will not be insufficient.

[0032] The cap welding machine further comprises a workbench 8, the workbench 8 is provided with a fixed base 81, the steel shell positioning table 11 is fixed on the fixed base 81 through a pin, and the adjusting process of the jig 1 and the laser welding machine 2 is reduced.

[0033] The above embodiments only describe the preferred embodiments of the present application, and do not limit the scope of the present application, and various modifications and improvements of the technical scheme of the present application made by the ordinary engineering technicians in the art without departing from the design spirit of the present application shall fall within the protection scope determined by the claims of the present application.

Claims

1. A cap welding machine comprising a laser welding machine and a jig, a positioning area for positioning a battery cell on the jig corresponding to a laser beam, characterized in that, The tool comprises a cap positioning table and a steel shell positioning table, and a fastening mechanism, the fastening mechanism comprises a positioning part matched with the steel shell positioning table to fix the steel shell positioning table, and an elastic part to drag the positioning part to move towards the steel shell positioning table.

2. A cap sealer as claimed in claim 1, characterized in that The part of the cap positioning table for restraining the cap is provided with a notch matching the diameter of the cap on the side surface thereof.

3. A cap sealer as claimed in claim 1, wherein, The cap positioning table is arranged above the steel shell positioning table, and the same side surfaces of the two are respectively arranged for the positioning of the cap and the steel shell.

4. A cap sealer as claimed in claim 1, wherein, The positioning part comprises a positioning plate and a pull rod, the positioning plate is arranged on the steel shell positioning table through the pull rod, and the pull rod is in a movable relationship with the steel shell positioning table, pulling the pull rod can adjust the distance between the positioning plate and the steel shell positioning table, the steel shell positioning table and the positioning plate are in a state of being opposite to each other, the elastic part comprises a limiting plate and a spring, the pull rod is connected with the limiting plate after passing through the steel shell positioning table, and the spring is sleeved on the pull rod and located between the limiting plate and the steel shell positioning table.

5. A cap sealer machine according to claim 4, wherein, The surfaces opposite to each other between the steel shell positioning table and the positioning plate are arc surfaces matched with the steel shell.

6. A cap sealer machine according to claim 4, wherein, The positioning plate is provided with a nut.

7. A cap sealer machine according to claim 4, wherein, The edge of the inner side surface of the steel shell positioning table is provided with a pulley.

8. A cap sealer machine according to claim 1, wherein, A vacuum cleaning assembly between the tool and the laser welding machine, the vacuum cleaning assembly comprises a cleaning bin, the middle of the cleaning bin is an open structure, a laser beam passes through the open structure and is shot on a tab in contact with the cap, and the peripheral surface of the cleaning bin is provided with a vacuum extraction hole communicating with the open structure.

9. A cap sealer machine according to claim 8, wherein, A linear movement mechanism is further comprised, the vacuum cleaning assembly is arranged on the output end of the linear movement mechanism, and a spring pressing nozzle is arranged on the back surface of the cleaning bin, the spring pressing nozzle is a conical body, and the spring pressing nozzle also has a through hole for the laser beam to pass through.

10. A cap sealer machine according to claim 1, wherein, The cap welding machine further comprises a workbench, the workbench is provided with a fixed base and a pin, and the steel shell positioning table is fixed on the fixed base through the pin.

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