A sealing nail welding mechanism without pre-welding

Abstract

The present invention discloses a sealing nail pre-welding-free welding mechanism, comprising a three-axis positioning platform and a laser assembly and a sealing nail pressing mechanism arranged on the three-axis positioning platform; the three-axis positioning platform comprises an X-axis movable platform, a Y-axis movable platform, and an R-axis rotating platform; the laser assembly comprises a laser connected to the R-axis rotating platform; the sealing nail pressing mechanism comprises a pressure head connected to the R-axis rotating platform for up and down sliding; the X-axis movable platform, the Y-axis movable platform, and the R-axis rotating platform are provided with through grooves for avoiding the laser and the pressure head. The welding mechanism of the present application can ensure that the sealing nail is always kept pressed during the sealing nail welding process, thereby eliminating the sealing nail pre-welding process, improving battery production efficiency, and reducing costs.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery production equipment, in particular to a sealing nail welding mechanism without pre-welding. Background Art

[0002] With the rapid development of electric vehicles, energy storage and other fields, the market demand for lithium batteries continues to grow, and the demand for increased battery production capacity is becoming increasingly urgent. In the lithium battery production process, welding of sealing pins after battery filling is an essential process. However, during the welding process of the sealing pins, the sealing pins often warp due to heat deformation, resulting in poor welding of the sealing pins. In order to avoid the phenomenon of sealing pins warping during the welding process, the existing sealing aluminum sheet welding process usually adds a sealing pin pre-welding process before the sealing pins are fully welded. The sealing pins are first pre-welded and fixed, and then the sealing pins are fully welded. Although it effectively solves the problem of sealing pins warping during full welding, the addition of a pre-welding process reduces production efficiency, while adding a laser welding station and increasing costs. Summary of the Invention

[0003] The object of the present invention is to provide a sealing nail welding mechanism without pre-welding, so as to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A sealing nail welding mechanism without pre-welding comprises a three-axis positioning platform and a laser assembly and a sealing nail pressing mechanism arranged on the three-axis positioning platform; the three-axis positioning platform comprises an X-axis movable platform, a Y-axis movable platform, and an R-axis rotating platform; the laser assembly comprises a laser connected to the R-axis rotating platform; the sealing nail pressing mechanism comprises a pressing head connected to the R-axis rotating platform for upward and downward sliding; the X-axis movable platform, the Y-axis movable platform, and the R-axis rotating platform are provided with through grooves for avoiding the laser and the pressing head.

[0006] The three-axis positioning table is used to move the laser in the X-axis and Y-axis directions and rotate the laser on the R-axis. The laser can be moved to the desired position by moving the X-axis and the R-axis can be used to rotate the sealing pins for laser welding. At the same time, by setting a sealing pin clamping mechanism, the sealing pins can be clamped during the welding process.

[0007] As a further solution of the present invention: a mounting bracket is provided at the lower end of the three-axis positioning platform, a workbench is provided at the upper end of the mounting bracket, and the Y-axis moving platform is slidably connected to the workbench via a Y-axis linear slide rail.

[0008] As a further solution of the present invention: a Y-axis motor screw assembly is provided on the workbench, and the Y-axis motor screw assembly is dynamically connected to the Y-axis moving platform through a Y-axis screw connector.

[0009] The Y-axis linear slide rail is provided to connect the Y-axis mobile platform to the workbench in a sliding manner, and the motor and screw assembly are provided to drive the Y-axis mobile platform to move in the Y-axis direction.

[0010] As a further solution of the present invention: the X-axis moving platform is slidably connected to the bottom of the Y-axis moving platform through an X-axis linear slide rail.

[0011] As a further solution of the present invention: an X-axis motor screw assembly is provided on the Y-axis movable platform, and the X-axis motor screw assembly is dynamically connected to the X-axis movable platform via an X-axis screw connector.

[0012] The X-axis linear slide rail is provided to enable the X-axis movable platform to be slidably connected to the Y-axis movable platform, and the motor and screw assembly are provided to drive the X-axis movable platform to move in the X-axis direction.

[0013] As a further solution of the present invention: the lower end of the R-axis rotating platform is rotatably connected to the X-axis moving platform through an R-axis slewing bearing.

[0014] As a further solution of the present invention: an R-axis servo motor is provided on the X-axis movable platform, gear teeth are provided on the outer side of the R-axis slewing bearing, and an R-axis driving wheel meshingly connected to the R-axis slewing bearing is provided on the X-axis movable platform, and the R-axis driving wheel is used for power connection to the R-axis servo motor.

[0015] The R-axis rotating platform is rotatably connected to the X-axis moving platform through an R-axis slewing bearing, and an R-axis servo motor and gears are also provided to drive the rotation of the R-axis rotating platform.

[0016] As a further embodiment of the present invention, the laser assembly includes an R-axis mounting plate fixedly connected to the R-axis rotating platform, the R-axis mounting plate being provided with a laser mounting member, and the laser being fixedly connected to the R-axis mounting plate via the laser mounting member. The laser can then be used to weld the sealing pins. Furthermore, the laser is positioned on the R-axis rotating platform, thereby enabling rotational welding.

[0017] As a further solution of the present invention: the sealing nail clamping mechanism includes a pressure head mounting plate fixed to the R-axis rotating platform, the pressure head mounting plate is slidably connected with a pressure head connecting piece through a linear bearing and a guide rod, the pressure head connecting piece is connected to a pressure head cylinder through a top block, the cylinder end of the pressure head cylinder is fixedly connected to the R-axis rotating platform through the pressure head cylinder mounting plate, the pressure head is fixedly connected to the lower end of the guide rod, and a compression spring is sleeved on the guide rod.

[0018] A pressure head is set up to press the sealing pin onto the battery during welding to prevent the sealing pin from lifting during welding.

[0019] As a further solution of the present invention: the pressure head is arranged coaxially with the R-axis rotating platform, the laser is located on one side of the pressure head axis and is arranged obliquely to the pressure head axis, a battery transplanting jig is provided below the pressure head, and the battery transplanting jig is located below the X-axis moving platform.

[0020] The pressure head is coaxially arranged with the R-axis rotating platform, which can ensure that during the rotation welding process, the pressure head is always pressed against the upper end face of the sealing pin, and the pressure head will not be separated from the sealing pin due to rotation. At the same time, the axis of the laser and the pressure head are arranged at an angle, so that the laser emitted by the laser intersects with the axis of the pressure head below the pressure head. That is, when the pressure head is pressed on the sealing pin, the laser emitted by the laser is irradiated on the connection between the sealing pin and the battery shell, and the sealing pin can be laser welded.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application uses a three-axis positioning platform to calibrate the position of the laser and the pressure head according to the actual position of the battery to ensure that the pressure head and the sealing pin are concentric while the laser beam can be irradiated around the sealing pin. During the sealing pin welding process, the pressure head cylinder remains in a retracted state, and the pressure head remains in a state of pressing the sealing pin under the action of the compression spring. At the same time, the R-axis rotary bearing rotates and drives the laser to rotate around the center of the R-axis rotary bearing, so that the laser beam rotates and welds along the periphery of the sealing pin. Finally, the sealing pin completes the welding while remaining in a compressed state. The welding mechanism of the present application can achieve the goal of always keeping the sealing pin compressed during the sealing pin welding process, thereby eliminating the sealing pin pre-welding process, improving battery production efficiency, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the front axonometric view of the sealing nail welding mechanism without pre-welding;

[0023] Figure 2 This is a front view of the welding mechanism without pre-welding of the sealing nail;

[0024] Figure 3 This is the front axonometric view of the three-axis positioning table;

[0025] Figure 4 This is the front view of the three-axis positioning stage;

[0026] Figure 5 This is the front axonometric view of the laser assembly;

[0027] Figure 6 This is the front axonometric view of the sealing nail pressing mechanism;

[0028] Figure 7 This is a front cross-sectional view of the sealing nail without pre-welding welding mechanism;

[0029] Figure 8 This is a partial enlarged view of the sealing pin pressing mechanism during welding.

[0030] In the picture:

[0031] 1- three-axis positioning table, 101- mounting bracket, 102- X-axis moving platform, 103- X-axis motor lead screw assembly, 104- Y-axis moving platform, 105- R-axis slewing bearing, 106- R-axis driving wheel, 107- Y-axis lead screw connector, 108- R-axis motor mounting plate, 109- Y-axis motor lead screw assembly, 110- X-axis lead screw connector, 111- X-axis linear slide, 112- Y-axis linear slide, 113- R-axis servo motor;

[0032] 2-laser assembly, 201-R axis mounting plate, 202-laser mounting, 203-laser;

[0033] 3-sealing nail pressing mechanism, 301-pressing head, 302-guide rod, 303-compression spring, 304-pressing head mounting plate, 305-pressing head cylinder mounting plate, 306-top block, 307-pressing head cylinder, 308-pressing head connector, 309-linear bearing;

[0034] 4-battery positioning and transfer fixture, 5-battery, 6-sealing nail, 7-laser beam. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See also Figure 1-8In an embodiment of the present invention, a sealing pin welding mechanism without pre-welding is provided, comprising a three-axis positioning platform 1, a laser assembly 2, and a sealing pin pressing mechanism 3 disposed on the three-axis positioning platform 1. The three-axis positioning platform 1 is used to move the laser in the X-axis and Y-axis directions and rotate the laser on the R-axis. The laser can be moved to a desired position by moving the X-axis and Y-axis, and the sealing pin can be selectively laser welded by rotating the R-axis. At the same time, by providing a sealing pin pressing mechanism, the sealing pin can be pressed during the welding process.

[0037] The three-axis positioning platform 1 includes an X-axis moving platform 102, a Y-axis moving platform 104, and an R-axis rotating platform. The lower end of the three-axis positioning platform 1 is provided with a mounting bracket 101, and the upper end of the mounting bracket 101 is provided with a workbench. The Y-axis moving platform 104 is slidably connected to the workbench through a Y-axis linear slide 112. A Y-axis motor screw assembly 109 is provided on the workbench. The Y-axis motor screw assembly 109 is power-connected to the Y-axis moving platform 104 through a Y-axis screw connector 107; the X-axis moving platform 102 is slidably connected to the lower side of the Y-axis moving platform 104 through an X-axis linear slide 111. An X-axis motor screw assembly 103 is provided on the mobile platform 104, and the X-axis motor screw assembly 103 is power-connected to the X-axis mobile platform 102 through an X-axis screw connector 110; the lower end of the R-axis rotating platform is rotationally connected to the X-axis mobile platform 102 through an R-axis slewing bearing 105, and an R-axis servo motor 113 is provided on the X-axis mobile platform 102, and gear teeth are provided on the outer side of the R-axis slewing bearing 105. An R-axis driving wheel 106 meshing with the R-axis slewing bearing 105 is provided on the X-axis mobile platform 102, and the R-axis driving wheel 106 is used for power connection to the R-axis servo motor 113. The Y-axis linear slide 112 can be used to make the Y-axis moving platform slidably connected to the workbench, and the Y-axis moving platform can be driven to move in the Y-axis direction by setting a motor and a screw assembly; the X-axis moving platform can be slidably connected to the Y-axis moving platform by setting a motor and a screw assembly, and the X-axis moving platform can be driven to move in the X-axis direction; the R-axis rotating platform is rotationally connected to the X-axis moving platform 102 by the R-axis slewing bearing 105, and an R-axis servo motor 113 and gears are also provided to drive the rotation of the R-axis rotating platform.

[0038] The laser assembly 2 includes a laser 203 connected to an R-axis rotating platform. The laser assembly 2 includes an R-axis mounting plate 201 fixedly connected to the R-axis rotating platform. In this embodiment, the R-axis rotating platform and the R-axis mounting plate 201 are the same plate. In practice, two plates or one plate can be arranged as needed. The R-axis mounting plate 201 is provided with a laser mounting member 202, and the laser 203 is fixedly connected to the R-axis mounting plate 201 via the laser mounting member 202. Laser 203 emits laser light, which can then be used to weld the sealing pins. At the same time, the laser 203 is arranged on the R-axis rotating platform, so rotational welding can be performed.

[0039] The sealing nail pressing mechanism 3 includes a pressure head 301 that is slidably connected to the R-axis rotating platform up and down; the sealing nail pressing mechanism 3 includes a pressure head mounting plate 304 fixed to the R-axis rotating platform, and the pressure head mounting plate 304 is slidably connected with a pressure head connector 308 through a linear bearing 309 and a guide rod 302, and the pressure head connector 308 is connected to a pressure head cylinder 307 through a top block 306, and the cylinder end of the pressure head cylinder 307 is fixedly connected to the R-axis rotating platform through a pressure head cylinder mounting plate 305, and the pressure head 301 is fixedly connected to the lower end of the guide rod 302, and a compression spring 303 is sleeved on the guide rod 302. The pressure head 301 is set, and the sealing nail can be pressed on the battery through the pressure head 301 during welding to prevent the sealing nail from curling during welding.

[0040] The X-axis moving platform 102 , the Y-axis moving platform 104 , and the R-axis rotating platform are provided with through slots for avoiding the laser 203 and the pressing head 301 . The ram 301 is coaxially arranged with the R-axis rotating platform, the laser 203 is located on one side of the axis of the ram 301 and is arranged obliquely with respect to the axis of the ram 301, a battery transplanting jig 4 is provided below the ram 301, and the battery transplanting jig 4 is located below the X-axis moving platform 102, and the ram 301 is coaxially arranged with respect to the R-axis rotating platform, which can ensure that during the rotation welding process, the ram 301 is always pressed tightly against the upper end face of the sealing pin, and the ram 301 will not be separated from the sealing pin due to rotation. At the same time, the laser 203 is arranged obliquely with respect to the axis of the ram 301, so that the laser emitted by the laser 203 intersects with the axis of the ram 301 below the ram 301, that is, when the ram 301 is pressed on the sealing pin, the laser emitted by the laser 203 is irradiated on the connection between the sealing pin and the battery shell, and then the sealing pin can be laser welded.

[0041] When the present invention is in use, the three-axis positioning platform 1 is in the initial position in the initial state, the pressure head cylinder 307 is in the extended state, the battery 5 is loaded onto the battery positioning and transfer fixture 4 at the front station and CCD photography and positioning are performed, and then the battery positioning and transfer fixture 4 transfers the battery 5 to the welding station, and at the same time, the CCD sends the photography information to the host computer, and the host computer sends the battery 5 positioning information to the sealing nail pre-welding welding mechanism. According to the received battery 5 position information, the X-axis motor screw assembly 103 and the Y-axis motor screw assembly 109 respectively drive the X-axis moving platform 102 and the Y-axis moving platform 104 Precise positioning is performed to make the pressure head 301 concentric with the sealing pin 6, and then the pressure head cylinder 307 retracts. Under the action of the compression spring 303, the pressure head 301 moves downward and presses the sealing pin 6. The laser 203 emits light, and the laser 7 is irradiated from the side at the joint of the sealing pin 6 and the battery 5 to start welding the sealing pin 6. The R-axis servo motor 113 is started to drive the laser assembly 2 and the sealing pin pressing mechanism 3 to rotate, thereby rotating the laser 7 360 degrees around the center of the sealing pin 6 to complete the welding of the sealing pin 6. After the welding is completed, the battery positioning and transfer jig 4 transfers the welded battery 5 to the next workstation.

[0042] To avoid cable routing problems such as lasers, the direction of the R-axis slewing bearing 105 when welding the sealing pin of the next battery is opposite to that of the previous welding, and the R-axis slewing bearing 1.5 is always kept in forward and reverse rotation during welding.

[0043] To sum up, the present invention uses the three-axis positioning platform 1 to perform precise positioning in the X-axis and Y-axis directions according to the actual position of the battery 5, ensuring that the pressure head 301 is concentric with the sealing pin 6. During the sealing pin welding process, the pressure head cylinder 307 remains in a retracted state, and the elastic force of the compression spring 303 enables the pressure head 301 to maintain a state of pressing the sealing pin 6. At the same time, the R-axis rotary bearing 105 rotates and drives the laser 203 to rotate around the center of the R-axis rotary bearing 105, so that the laser beam 7 rotates and welds along the periphery of the sealing pin 6. Finally, the sealing pin 6 is welded while remaining in a pressed state.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0045] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A sealing nail welding mechanism without pre-welding, characterized in that: It comprises a three-axis positioning platform (1), a laser assembly (2) and a sealing pin pressing mechanism (3) arranged on the three-axis positioning platform (1); The three-axis positioning platform (1) includes an X-axis moving platform (102), a Y-axis moving platform (104), and an R-axis rotating platform; the laser assembly (2) includes a laser (203) connected to the R-axis rotating platform; the sealing pin pressing mechanism (3) includes a pressing head (301) connected to the R-axis rotating platform in an upward and downward sliding manner; The X-axis moving platform (102), the Y-axis moving platform (104), and the R-axis rotating platform are provided with through slots for avoiding the laser (203) and the pressure head (301).

2. A sealing nail welding mechanism without pre-welding according to claim 1, characterized in that: The lower end of the three-axis positioning platform (1) is provided with a mounting bracket (101), the upper end of the mounting bracket (101) is provided with a workbench, and the Y-axis moving platform (104) is slidably connected to the workbench via a Y-axis linear slide rail (112).

3. A sealing nail welding mechanism without pre-welding according to claim 2, characterized in that: A Y-axis motor screw assembly (109) is provided on the workbench, and the Y-axis motor screw assembly (109) is dynamically connected to the Y-axis movable platform (104) via a Y-axis screw connector (107).

4. A sealing nail welding mechanism without pre-welding according to claim 2, characterized in that: The X-axis moving platform (102) is slidably connected to the bottom of the Y-axis moving platform (104) via an X-axis linear slide rail (111).

5. A sealing nail welding mechanism without pre-welding according to claim 4, characterized in that: An X-axis motor screw assembly (103) is provided on the Y-axis movable platform (104), and the X-axis motor screw assembly (103) is dynamically connected to the X-axis movable platform (102) via an X-axis screw connector (110).

6. A sealing nail welding mechanism without pre-welding according to claim 1 or 4, characterized in that: The lower end of the R-axis rotating platform is rotationally connected to the X-axis moving platform (102) via an R-axis slewing bearing (105).

7. A sealing nail welding mechanism without pre-welding according to claim 6, characterized in that: An R-axis servo motor (113) is provided on the X-axis movable platform (102), gear teeth are provided on the outer side of the R-axis rotary bearing (105), and an R-axis driving wheel (106) meshingly connected to the R-axis rotary bearing (105) is provided on the X-axis movable platform (102), and the R-axis driving wheel (106) is used for power connection to the R-axis servo motor (113).

8. The sealing nail welding mechanism without pre-welding according to claim 1, characterized in that: The laser assembly (2) comprises an R-axis mounting plate (201) fixedly connected to the R-axis rotating platform, a laser mounting member (202) is provided on the R-axis mounting plate (201), and the laser (203) is fixedly connected to the R-axis mounting plate (201) via the laser mounting member (202).

9. The sealing nail welding mechanism without pre-welding according to claim 1, characterized in that: The sealing nail pressing mechanism (3) includes a pressure head mounting plate (304) fixed to the R-axis rotating platform, a pressure head connecting piece (308) is slidably connected to the pressure head mounting plate (304) through a linear bearing (309) and a guide rod (302), a pressure head cylinder (307) is connected to the pressure head connecting piece (308) through a top block (306), the cylinder end of the pressure head cylinder (307) is fixedly connected to the R-axis rotating platform through the pressure head cylinder mounting plate (305), the pressure head (301) is fixedly connected to the lower end of the guide rod (302), and a compression spring (303) is sleeved on the guide rod (302).

10. A sealing nail welding mechanism without pre-welding according to claim 1, characterized in that: The press head (301) is coaxially arranged with the R-axis rotating platform, the laser (203) is located on one side of the axis of the press head (301) and is arranged obliquely with respect to the axis of the press head (301), a battery transplanting jig (4) is provided below the press head (301), and the battery transplanting jig (4) is located below the X-axis moving platform (102).

Images