A sealing nail laser welding dust removal device and a dust removal method thereof

Abstract

The present application relates to a kind of sealing nail laser welding dust removal devices, including laser head and dust cover of the laser head exterior shaft, dust cover top is provided with the buckle piece for connecting smoke dust inductor, dust cover outer wall is provided with several return air pipes, dust cover is provided with drive assembly and the adjusting assembly under the drive of drive assembly, adjusting assembly includes cover and the inner cover elastically connected on cover, laser head exterior shaft is provided with the vibration assembly for driving inner cover to shake, drive assembly is used to drive cover and inner cover to reciprocate, adjusting assembly is used to adjust airflow direction when return air pipe adsorbs smoke dust and metal dust, disturb the airflow direction in return air pipe, prevent metal dust from settling in return air pipe inner wall, greatly improve the dust removal effect.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of energy storage batteries, and particularly relates to a sealing nail laser welding dust removal device and a dust removal method thereof. BACKGROUND

[0002] Lithium battery technology has developed rapidly, and battery sealing nail welding has become an indispensable important part in the lithium battery manufacturing process. However, most sealing nail welding adopts pulse laser welding, but the battery shell material such as aluminum has strong heat conductivity, which easily leads to insufficient penetration, low welding interface bonding strength and leakage risk.

[0003] A dust removal device for a laser welding machine is disclosed in Chinese Patent No. CN114985920B, which comprises a dust removal filter, a dust removal filter air inlet is communicated with a air supply pipe, the air supply pipe is fixedly provided with an air inlet cover at the end away from the dust removal filter, and the air inlet cover is provided with an adjusting mechanism; the adjusting mechanism comprises a mounting plate, four synchronous gears, four elastic extension rods and an adjusting assembly; the four synchronous gears are meshed with each other, one end of the four elastic extension rods is fixedly arranged on the corresponding synchronous gear, and the other end is rotatably provided with an adjusting wheel, and the adjusting assembly is fixedly arranged on the mounting plate and used for driving the four synchronous gears to synchronously rotate; the air inlet cover comprises a flexible sleeve fixedly arranged at the end of the air supply pipe away from the dust removal filter and a belt support ring, the belt support ring is fixedly arranged at the end of the flexible sleeve away from the air supply pipe, the belt support ring is connected between the four adjusting wheels, and the air speed of the air inlet is adjusted under the condition that the pumping power provided by the dust removal filter is unchanged.

[0004] However, the present inventors have found that, in the actual welding process, electrolyte residues or gas expansion easily form welding defects such as pores and cracks, which further affect the sealing property of the battery and lead to the risk of liquid leakage. SUMMARY

[0005] The application aims at the shortcomings of the prior art, and provides a sealing nail laser welding dust removal device, which forms a closed cavity wrapping the laser action area through the annular cylinder-shaped dust removal cover, accelerates the airflow, increases the kinetic energy, reduces the falling of metal particles in the welding process, drives the inner cover and the outer cover to reciprocatingly rotate through the adjusting assembly, and drives the inner cover to vibrate at the same time, disturbs the airflow direction in the return air pipe, prevents the metal dust from settling on the inner wall of the return air pipe, and greatly improves the dust removal effect.

[0006] The technical solution of the application is as follows:

[0007] The application discloses a laser welding dust removal device for sealing nails, which comprises a laser head and a dust removal cover sleeved on the outer shaft of the laser head, wherein the top of the dust removal cover is provided with a buckle for connecting a smoke dust sensor, the outer wall of the dust removal cover is provided with a plurality of air return pipes, the dust removal cover is provided with a driving assembly and an adjusting assembly driven by the driving assembly, the adjusting assembly comprises an outer cover and an inner cover elastically connected to the outer cover, the outer shaft of the laser head is provided with a vibration assembly for driving the inner cover to vibrate, the driving assembly is used for driving the outer cover and the inner cover to move back and forth, and the adjusting assembly is used for adjusting the airflow direction when the air return pipes adsorb smoke dust and metal dust.

[0008] As a kind of preferred, the driving assembly includes the sliding groove opened in the dust removal cover, the fixed plate fixedly arranged on the dust removal cover, the servo motor fixedly arranged on the fixed plate, the rotating shaft rotatably arranged on the fixed plate, the gear fixedly arranged on the rotating shaft, the fixed shaft fixedly arranged on the outer cover, and the gear ring fixedly arranged on the fixed shaft, wherein the gear is engaged with the gear ring, and the output shaft of the servo motor is fixedly connected with the rotating shaft.

[0009] As a kind of preferred, the adjusting assembly further comprises a first inclined hole and a second inclined hole opened in the outer cover and the inner cover, and a plurality of springs fixedly connected between the outer cover and the inner cover, wherein the outer cover is rotatably matched with the outer shaft of the laser head, the first inclined hole and the second inclined hole are matched with the air return pipes, and the first inclined hole and the second inclined hole are arranged in a spaced manner and oppositely inclined.

[0010] As a kind of preferred, the vibration assembly comprises a plurality of first protrusions fixedly arranged on the inner cover and a plurality of second protrusions fixedly arranged on the outer shaft of the laser head, wherein the first protrusions are matched with the second protrusions.

[0011] As a kind of preferred, the dust removal cover, the outer cover and the inner cover are all arranged in the annular cylindrical structure, and the materials of the dust removal cover, the outer cover and the inner cover can all be any one of silica gel or metal silica gel composite material, and the dust removal cover, the outer cover and the inner cover are all coated with a nano oil-repellent layer.

[0012] As a kind of preferred, the dust removal cover is provided below the welding pressure plate with air holes, and the bottom of the dust removal cover is fixedly provided with a gas blowing pipe.

[0013] As a kind of preferred, the air return pipe is made of metal hose material, and the air return pipe is connected with a negative pressure fan.

[0014] Another design purpose of the application is to provide a laser welding dust removal method for sealing nails, which comprises the following steps:

[0015] Step one, after fixing the workpiece on the welding pressure plate, the surface of the sealing nail is cleaned at a negative pressure of 5-10 kPa, and then the sealing nail is welded by the laser head;

[0016] Step two, the smoke dust sensor detects the smoke dust concentration, dynamically adjusts the negative pressure in the range of 15-25kPa, and is linked to the laser power according to the proportional coefficient K=P*0.2+10kPa;

[0017] Step three, the servo motor drives the forward and reverse gear to rotate, drives the outer cover and the inner cover to move back and forth, and the inner cover vibrates in the cooperation of the first protrusion and the second protrusion during the reciprocating movement, and the smoke dust and the metal dust enter the return air pipe through the first inclined hole and the second inclined hole;

[0018] Step four, pulse high-pressure blowing is adopted for the welding seam through the blowing pipe, the blowing frequency and the welding pulse frequency are in a proportional relationship of 1:1.2-1.5, and the metal powder dust is recovered under the condition of maintaining 20kPa negative pressure.

[0019] As a preferred, in the step one, argon auxiliary airflow is introduced, and the argon flow and the negative pressure value are controlled according to Q=0.1*V 2 +5L / min relationship V is the negative pressure value.

[0020] As a preferred, in the step two, the negative pressure adjustment response time is less than or equal to 50ms, and the laser power fluctuation compensation coefficient is ΔP=±(V measured-V set) *0.5W / Pa.

[0021] The beneficial effects of the present application are

[0022] 1. The present application is provided with a dust removal cover and a return air pipe, the dust removal cover with a ring-shaped cylindrical structure can accelerate airflow, increase kinetic energy, reduce metal particle falling during welding, and four return air pipes are evenly distributed on the conical small table surface of the dust removal cover, increase the dust removal air volume, and make the air volume evenly distributed.

[0023] 2. The present application is also provided with an adjusting assembly and a vibrating assembly, the inner cover is shaken while the outer cover and the inner cover slide back and forth during the dust removal process, the airflow direction in the return air pipe is disturbed, and the metal powder dust is not easy to settle on the pipe wall.

[0024] In summary, the present application has the advantages of good dust removal effect and high efficiency, and is suitable for the field of energy storage battery technology. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in combination with the drawings:

[0026] Figure 1 It is a structure schematic view of a sealed nail laser welding dust removal device;

[0027] Figure 2 It is a structure schematic view of an outer cover;

[0028] Figure 3 It is a structure schematic view of a second protrusion;

[0029] Figure 4 Fig. 6 is a schematic view of the state of the outer cover and the inner cover when reciprocating;

[0030] Figure 5 Fig. 7 is a schematic view of the state of the inner cover when shaking;

[0031] Figure 6 Fig. 8 is a schematic view of the state of the inner cover when shaking; Figure 5 Fig. 9 is an enlarged view of A in Fig. 8;

[0032] Figure 7 Fig. 10 is an enlarged view of B in Fig. 8; Figure 5 Fig. 11 is an enlarged view of C in Fig. 8;

[0033] Figure 8 Fig. 12 is a schematic view of the state of the smoke dust and the metal dust when passing through the first inclined hole and the second inclined hole;

[0034] Fig. 1 is a schematic view of the laser head, Fig. 2 is a schematic view of the dust removal cover, Fig. 3 is a schematic view of the smoke dust sensor, Fig. 4 is a schematic view of the buckle, Fig. 5 is a schematic view of the return air pipe, Fig. 6 is a schematic view of the driving assembly, Fig. 61 is a schematic view of the sliding groove, Fig. 62 is a schematic view of the fixed plate, Fig. 63 is a schematic view of the servo motor, Fig. 64 is a schematic view of the rotating shaft, Fig. 65 is a schematic view of the gear, Fig. 66 is a schematic view of the fixed shaft, Fig. 67 is a schematic view of the gear ring, Fig. 7 is a schematic view of the adjusting assembly, Fig. 71 is a schematic view of the outer cover, Fig. 72 is a schematic view of the inner cover, Fig. 73 is a schematic view of the first inclined hole, Fig. 74 is a schematic view of the second inclined hole, Fig. 75 is a schematic view of the spring, Fig. 8 is a schematic view of the vibration assembly, Fig. 81 is a schematic view of the first protrusion, Fig. 82 is a schematic view of the second protrusion, Fig. 9 is a schematic view of the welding pressing plate, and Fig. 10 is a schematic view of the air blowing pipe. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings.

[0036] Embodiment one

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0038] As Figures 1 to 8As shown, a kind of sealing nail laser welding dust removal device, including laser head 1 and dust cover 2 of the laser head 1 external shaft, dust cover 2 top is provided with the buckle member 4 for connecting smoke dust sensor 3, dust cover 2 outer wall is provided with several back air pipes 5, dust cover 2 is provided with driving assembly 6 and the adjusting assembly 7 under the driving of driving assembly 6, adjusting assembly 7 includes cover 71 and the inner cover 72 of elastically connected on cover 71, laser head 1 external shaft is provided with the vibration assembly 8 for driving inner cover 72 to shake, driving assembly 6 is used to drive cover 71 and inner cover 72 to move back and forth, adjusting assembly 7 is used to adjust airflow direction when back air pipe 5 adsorbs smoke dust and metal dust, wherein, smoke dust sensor 3 is embedded in the top center of dust cover 2, its detection probe penetrates the inner wall of dust cover 2, real-time monitoring the smoke density in closed cavity, smoke dust sensor 3 is connected with external control unit by signal line, control unit dynamically adjusts the power of negative pressure fan according to smoke density feedback signal, and is real-time linkage with laser welding parameter, the top center of dust cover 2 is connected with smoke dust sensor 3 by quick-release buckle member 4, buckle member 4 is spring locking structure, can realize the axial quick installation and disassembly of smoke dust sensor 3.

[0039] It is worth mentioning that, as Figure 4 shown, driving assembly 6 includes chute 61 opened in dust cover 2, fixed plate 62 fixedly arranged on dust cover 2, servo motor 63 fixedly arranged on fixed plate 62, rotating shaft 64 rotatably arranged on fixed plate 62, gear 65 fixedly arranged on rotating shaft 64, fixed shaft 66 fixedly arranged on cover 71, and gear ring 67 fixedly arranged on fixed shaft 66. Gear 65 is engaged with gear ring 67. Output shaft of servo motor 63 is fixedly connected with rotating shaft 64. In use, when laser head 1 welds sealing nail, servo motor 63 drives gear 65 to rotate forward and backward, thereby driving gear ring 67, fixed shaft 66 and cover 71 to reciprocate in chute 61.

[0040] In addition, as Figures 4 to 8 shown, adjusting assembly 7 further includes first inclined hole 73 and second inclined hole 74 opened in cover 71 and inner cover 72, and a plurality of springs 75 fixedly connected between cover 71 and inner cover 72. Cover 71 is rotatably connected with external shaft of laser head 1. First inclined hole 73 and second inclined hole 74 are matched with back air pipe 5. First inclined hole 73 and second inclined hole 74 are arranged in a spaced manner and oppositely inclined. In use, by rotating cover 71 and inner cover 72, airflow direction in back air pipe 5 is disturbed, and first inclined hole 73 and second inclined hole 74 are staggered and correspond to back air pipe 5, so as to strengthen the effect of disturbing airflow, and prevent metal dust from settling on the pipe wall when back air pipe 5 adsorbs metal dust.

[0041] It is worth mentioning that, as Figure 5 andFigure 6 As shown, the vibration assembly 8 includes a plurality of first protrusions 81 fixedly arranged on the inner cover 72, a plurality of second protrusions 82 fixedly arranged on the outer shaft of the laser head 1, and the first protrusions 81 cooperate with the second protrusions 82. In use, the inner cover 72 performs shaking when reciprocating, under the cooperation of the first protrusions 81 and the second protrusions 82, so that the metal dust is not easy to settle on the inner wall.

[0042] It should be further pointed out that, as Figure 5 shown, the dust cover 2, the outer cover 71 and the inner cover 72 are all arranged in a ring-shaped cylindrical structure, and the materials of the three can be any one of silica gel or metal silica gel composite material. The dust cover 2, the outer cover 71 and the inner cover 72 are all coated with a nano oil-repellent layer. The ring-shaped cylindrical structure can accelerate airflow, increase kinetic energy and reduce metal particle drop during welding. The nano oil-repellent layer can reduce electrolyte adhesion and corrosion of the equipment during use.

[0043] It is worth mentioning that, as Figure 1 shown, the welding pressure plate 9 with air holes is arranged below the dust cover 2, and the air blowing pipe 10 is fixedly arranged at the bottom of the dust cover 2. The metal welding pressure plate 9 with air holes is located directly below the dust cover 2, which is used to fix the workpiece while allowing the smoke to escape upward into the dust cover 2. The air blowing pipe 10 is connected with a fan, which can generate high-pressure airflow to blow the weld.

[0044] Further, as Figure 1 shown, the return air pipe 5 is made of metal hose material, and the negative pressure fan is connected to the return air pipe 5. The return air pipe 5 is evenly distributed and connected to the conical table surface of the dust cover 2, which increases the dust removal air volume and makes the air volume evenly distributed. An independent air volume adjusting valve is arranged on the pipe section of each return air pipe 5 close to the dust cover 2, which is used to balance the suction force of each pipeline.

[0045] Example two

[0046] A laser welding dust removal method for sealing nails, comprising the following steps:

[0047] Step one, after the welding pressure plate 9 fixes the workpiece, the surface of the sealing nail is cleaned at a negative pressure of 5-10 kPa, and then the sealing nail is welded by the laser head 1;

[0048] Step two, the smoke sensor 3 detects the smoke concentration, dynamically adjusts the negative pressure in the range of 15-25 kPa, and links with the laser power to adjust according to the proportional coefficient K=P×0.2+10 kPa.

[0049] Step three, the servo motor 63 drives the gear 65 to rotate forward and backward, drives the outer cover 71 and the inner cover 72 to move back and forth, the inner cover 72 vibrates in the cooperation of the first protrusion 81 and the second protrusion 82 during the back and forth movement, the smoke dust and the metal dust enter into the return air pipe 5 through the first inclined hole 73 and the second inclined hole 74;

[0050] Step four, the welding seam is swept by the pulse high pressure blowing of the blowing pipe 10, the sweeping frequency is in the proportional relationship of 1:1.2-1.5 with the welding pulse frequency, and the metal dust is recovered under the negative pressure of 20kPa at the same time.

[0051] Further, in step one, the argon auxiliary airflow is introduced, the argon flow and the negative pressure value are controlled according to the relationship of Q=0.1xV 2 +5L / min.

[0052] In addition, in step two, the negative pressure adjustment response time is less than or equal to 50ms, and the laser power fluctuation compensation coefficient is ΔP=±(V measured-V set) x 0.5W / Pa.

[0053] Working process

[0054] Before welding, the nail pressing station is stabilized after pressing the top, the low negative pressure airflow is used to clean the sealing nail and the surrounding area, so that the electrolyte residue and the dust on the surface of the sealing nail are removed, then the laser head 1 welds the sealing nail, the smoke sensor 3 is connected to the external control unit through the signal line, the control unit dynamically adjusts the power of the negative pressure fan according to the smoke concentration feedback signal, the return air pipe 5 adsorbs the smoke and the metal dust, the servo motor 63 drives the gear 65 to rotate forward and backward, so as to drive the gear ring 67, the fixed shaft 66 and the outer cover 71 to slide back and forth in the chute 61, the outer cover 71 and the inner cover 72 are rotated to disturb the airflow direction in the return air pipe 5, the inner cover 72 shakes in the cooperation of the first protrusion 81 and the second protrusion 82 during the back and forth movement, the first inclined hole 73 and the second inclined hole 74 are staggered and correspond to the return air pipe 5, the effect of disturbing the airflow flow is enhanced, so that the metal dust can be prevented from settling on the pipe wall when the return air pipe 5 adsorbs the metal dust, after the welding process is completed, the welding seam and the welding surrounding area are swept by the high pressure airflow of the blowing pipe 10, and the dust cover 2 is used for recovering the residual metal particles generated in the welding process under the negative pressure.

[0055] In the description of the present application, it should be understood that the terms "front and back", "left and right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the application.

[0056] Of course in the technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0057] The above describes only the preferred embodiments of the present application in conjunction with the drawings, but the present application is not limited to the above-described embodiments, and it should be noted that various modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these should also be considered as the protection scope of the present application, and will not affect the effect and practicability of the present application.

Claims

1. A dust removal device for laser welding of sealing nails, comprising a laser head (1) and a dust removal cover (2) sleeved on the outer shaft of the laser head (1), characterized in that: The dust collector hood (2) is provided with a buckle (4) for connecting the smoke and dust sensor (3) at the top. The outer wall of the dust collector hood (2) is provided with a number of return air ducts (5). The dust collector hood (2) is provided with a drive assembly (6) and an adjustment assembly (7) driven by the drive assembly (6). The adjustment assembly (7) includes an outer cover (71) and an inner cover (72) elastically connected to the outer cover (71), a first oblique hole (73) and a second oblique hole (74) opened on the outer cover (71) and the inner cover (72). Several springs (75) are fixedly connected between the outer cover (71) and the inner cover (72). The outer cover (71) is rotatably engaged with the external shaft of the laser head (1). The first oblique hole (73) and the second oblique hole (74) are both engaged with the return air pipe (5). The first oblique hole (73) and the second oblique hole (74) are spaced apart and their inclination directions are opposite to each other. The drive assembly (6) includes a slide groove (61) opened on the dust collector cover (2) and a fixing plate (62) fixedly installed on the dust collector cover (2). A servo motor (63) is fixedly mounted on a fixed plate (62), a rotating shaft (64) is rotatably mounted on the fixed plate (62), a gear (65) is fixedly mounted on the rotating shaft (64), a fixed shaft (66) is fixedly mounted on an outer cover (71), and a gear ring (67) is fixedly mounted on the fixed shaft (66). The gear (65) meshes with the gear ring (67). The output shaft of the servo motor (63) is fixedly connected to the rotating shaft (64). The outer shaft of the laser head (1) is provided with a mechanism for driving the inner... The vibration component (8) of the cover (72) is shaken. The vibration component (8) includes several first protrusions (81) fixedly disposed on the inner cover (72) and several second protrusions (82) fixedly disposed on the outer shaft of the laser head (1). The first protrusions (81) cooperate with the second protrusions (82). The driving component (6) is used to drive the outer cover (71) and the inner cover (72) to reciprocate. The adjusting component (7) is used to adjust the airflow direction when the return air duct (5) adsorbs smoke and metal dust.

2. The dust removal device for laser welding of sealing nails according to claim 1, characterized in that: The dust cover (2), outer cover (71) and inner cover (72) are all set as annular cylindrical structures and the materials of the three can be set as either silicone or metal silicone composite material. The dust cover (2), outer cover (71) and inner cover (72) are all coated with a nano oleophobic layer.

3. The dust removal device for laser welding of sealing nails according to claim 1, characterized in that: A welded pressure plate (9) with ventilation holes is provided below the dust removal hood (2), and an air blowing pipe (10) is fixedly provided at the bottom of the dust removal hood (2).

4. The dust removal device for laser welding of sealing nails according to claim 1, characterized in that: The return air duct (5) is made of metal flexible hose and a negative pressure fan is connected to the return air duct (5).

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