CN218694897U - Laser welding blowing device for side plates of module - Google Patents

Abstract

The utility model discloses a module distolateral board laser welding gas blowing device, a serial communication port, including the mechanism of blowing, the joint of blowing, the mechanism of blowing includes air inlet, air inlet duct, air cock, the articulate of blowing the air inlet, the air inlet duct sets up inside the mechanism of blowing and communicates with each other with the air inlet, the other end of air inlet duct is the cecum, sets up the air cock of sword form along the length direction of air inlet duct, and the air cock communicates with each other with the outside, the air cock is the slope and sets up downwards. The utility model has the advantages that: the welding pool is greatly reduced; the welding appearance is greatly improved; the internal temperature of the welding area is greatly reduced, and the internal structure of the battery is effectively protected from being influenced by high temperature; simple structure, convenient processing and low cost.

Description

Laser welding blowing device for side plates of module

Technical Field

The utility model belongs to the technical field of a battery module manufacturing technology and specifically relates to a module end curb plate laser welding gas blowing device.

Background

Along with the requirement of the lithium ion battery module on energy density is gradually improved, the battery module is designed to present the series-parallel connection, the maximization and the standardization of a plurality of battery cells, the end side plates of the module are connected, and the industry can generally use laser welding as a main means. The welding of the end plate of the module generally requires to penetrate through the side plate to leave a weld joint with the fusion depth of 1mm to 2mm on the end plate, which belongs to typical laser deep fusion welding, a large amount of plasma is generated above a molten pool during welding to shield laser energy, so that the laser effect is weakened, the molten pool is oxidized violently during laser welding to make the welding mark rough and blackened, regular lines are difficult to form, a large amount of hydrogen elements in air are absorbed by molten pool liquid metal during welding, and pores are easy to generate after forming, so that the blowing of protective gas during welding becomes an important means for improving the welding effect and avoiding welding defects.

And as the design of large module tooling becomes more and more complex, the laser remote galvanometer welding process and equipment gradually become the main welding mode. The laser swing is mainly used for projecting laser at a welding position with a distance of 300mm to 500mm by virtue of a vibrating mirror, so that the laser swing can be adapted to different welding tools, in the process of swinging and remote welding of the vibrating mirror, the focus or the focal length may not be fixed, the focal length can be adjusted by virtue of a movable focusing mirror, the adjusting action of the focusing mirror is amplified by virtue of an objective lens, and the focus is variable in an axial direction or a three-dimensional space, so that the position of a protective gas injection port is difficult to change along with the position of the laser focus, and the coaxial blowing of protective gas cannot be realized.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms part of the prior art that is already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve lies in: how to solve the problem that the welding defect occurs in the welding process because a gas protection device matched with a remote welding head of a laser galvanometer is not available at present.

The utility model discloses a following technical means realizes solving above-mentioned technical problem:

the utility model provides a module end curb plate laser welding gas blowing device, includes gas blowing mechanism, blowing joint, gas blowing mechanism includes air inlet, air inlet duct, air cock, blowing joint connection the air inlet, the air inlet duct sets up inside the gas blowing mechanism and communicates with each other with the air inlet, the other end of air inlet duct is the blind end, sets up the air cock of sword form along the length direction of air inlet duct, and the air cock communicates with each other with the outside, the air cock is the slope and sets up downwards.

The utility model discloses a gas blowing joint introduces protective gas, gets into the air inlet duct by the air inlet, and the air cock blowout of air inlet duct internal gas by the sword form, the air cock internal gas form slope decurrent air curtain form, and protective gas forms stable protective gas atmosphere at welding area, the utility model discloses can use the inert gas of non-helium as protective gas, gas is difficult to be ionized when the welding to can blow away the plasma of molten bath top, laser energy direct action is at the welding surface, is difficult to be dissipated, and the gas slope sets up downwards and can reduce the air and be drawn into in protective gas in, can avoid protective gas direct action welding surface to lead to the welding seam to cave in again. The utility model discloses compare in coaxial direct-blow, can make the protective gas atmosphere last, stably effectively avoid the air to be drawn into. The utility model discloses protection gas blowing mouth is rectangular type, is favorable to the protective gas evenly distributed, forms stable atmosphere district, and further reduces the protection air flow rate, makes the welding molten bath shaping respond well.

Preferably, the blowing mechanism further comprises an air bin, the air bin is located inside the blowing mechanism, the air bin is arranged along the length direction of the air inlet groove, and the air bin is communicated with one side, away from the air faucet, of the air inlet groove.

The utility model discloses gas blowing device sets up the gas storehouse, is favorable to the excessive protective gas of buffer memory of protective gas to flow out, effectively avoids outside origin flow undulant, avoids the gas velocity of flow to change.

Preferably, the air bin is communicated with the air inlet groove through a plurality of air inlet holes.

Preferably, the inclination angle of the air tap is 25-30 degrees.

The utility model discloses well protection gas blows in the angle and is 25 ℃, and the angle is less than this moment, and the air is drawn into the protection gas atmosphere because of fluid pressure effect is more easily, and the protection gas blows in when the angle is greater than 30 ℃ protection gas direct action welding surface and leads to the welding seam sunken.

Preferably, the blowing mechanism is of a split structure and comprises a first module and a second module, and the first module and the second module are connected and then spliced to form the air inlet, the air inlet groove and the air tap.

Two module detachable structure make things convenient for the inside gas circuit structure of cleaning device.

Preferably, the whole blowing mechanism is of a rectangular block structure, and the bottom surface of the blowing mechanism is a plane.

The bottom surface is a plane, so that the inclination angle of the shielding gas can be conveniently controlled.

Preferably, the distance between the height of the end point of the air tap and the bottom surface of the air blowing mechanism is 10mm-18mm.

Preferably, the air blowing device further comprises an air inlet throttle valve, and the air inlet throttle valve is connected to the air blowing joint.

The flow of the protective gas is controlled to be 10L/min to 15L/min, and experimental results show that the protective gas atmosphere can completely cover a welding area, effectively exhaust surrounding air and avoid inconsistent molten pool forming and molten pool overflow caused by overlarge flow of the protective gas.

Preferably, the device further comprises a quick clamping mechanism, and the quick clamping mechanism is connected with the top surface of the air blowing mechanism.

The quick clamping mechanism is convenient for the blowing mechanism to be quickly installed at a welding position, and can tightly press a workpiece to be welded on the lower bottom surface of the blowing mechanism to serve as a welding clamp when working.

Preferably, the device further comprises a connecting and positioning rod, one end of the connecting and positioning rod is fixedly connected with the blowing mechanism, and one end of the connecting and positioning rod is connected with the quick clamping mechanism in a sliding mode.

The utility model has the advantages that:

(1) The utility model discloses a gas blowing joint introduces protective gas, gets into the air inlet duct by the air inlet, and the air cock blowout of air inlet duct internal gas by the sword form, the air cock internal gas form slope decurrent air curtain form, and protective gas forms stable protective gas atmosphere at welding area, the utility model discloses can use the inert gas of non-helium as protective gas, gas is difficult to be ionized when the welding to can blow away the plasma of molten bath top, laser energy direct action is at the welding surface, is difficult to be dissipated, and the gas slope sets up downwards and can reduce the air and be drawn into in protective gas in, can avoid protective gas direct action welding surface to lead to the welding seam to cave in again. The utility model discloses compare in coaxial direct-blow, can make the protective gas atmosphere last, stably effectively avoid the air to be drawn into. The protective gas blowing nozzle of the utility model is in a strip shape, which is beneficial to the uniform distribution of protective gas, the formation of a stable atmosphere area and the further reduction of the flow rate of the protective gas, so that the forming effect of a welding pool is good;

(2) The gas blowing device is provided with the gas bin, so that excessive buffer storage protective gas of the protective gas can flow out, external source flow fluctuation is effectively avoided, and gas flow velocity change is avoided;

(3) In the utility model, the blowing angle of the protective gas is 25 ℃, the angle is lower than the angle, the air is more easily drawn into the protective gas atmosphere due to the action of fluid pressure, and when the blowing angle of the protective gas is more than 30 ℃, the protective gas directly acts on the welding surface to cause the welding seam to be sunken;

(4) The air blowing mechanism has a simple structure, is convenient to process and low in cost, and the two modules have a detachable structure, so that the structure of an air path in the device can be conveniently cleaned;

(5) The bottom surface of the blowing mechanism is a plane, so that the inclination angle of the shielding gas can be conveniently controlled;

(6) The flow of the protective gas is controlled to be 10L/min to 15L/min, and experimental results show that the protective gas atmosphere can completely cover a welding area, effectively exhaust surrounding air and avoid inconsistent molten pool forming and overflow of the molten pool caused by overlarge flow of the protective gas;

(7) The quick clamping mechanism is convenient for the blowing mechanism to be quickly installed at a welding position, and can tightly press a workpiece to be welded on the lower bottom surface of the blowing mechanism to serve as a welding clamp when working;

(8) The welding process is completely in the atmosphere of the protective gas, the temperature of a welding workpiece can be effectively reduced, the heat insulation film inside the module and the battery cell rubberizing burn can be prevented, and the porosity of a welding molten pool protected by the protective gas blowing device is greatly reduced compared with that of a welding molten pool protected by the protective gas blowing device; the welding appearance is greatly improved through the blowing protection.

Drawings

FIG. 1 is a rear view of a cross section of one end of a side plate laser welding blowing device of a module end according to an embodiment of the present invention;

FIG. 2 is a schematic view of the connection between the gas blowing device and the fast clamping mechanism for laser welding of the end side plates of the module according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of the module end side plate laser welding blowing device according to the embodiment of the present invention after the second module is removed;

FIG. 4 is a top view of FIG. 3;

reference numbers in the figures:

1. a blowing mechanism; 11. an air inlet; 12. an air inlet groove; 13. an air tap; 14. a gas bin; 15. an air inlet; 16. a first module; 17. a second module;

2. a blowing joint; 3. an intake throttle valve; 4. a quick clamping mechanism; 5. connecting a positioning rod;

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 and 3, the laser welding blowing device for the module end side plates comprises a blowing mechanism 1 and a blowing connector 2, wherein the blowing mechanism 1 comprises an air inlet 11, an air inlet groove 12 and an air nozzle 13, the blowing connector 2 is connected with the air inlet 11, the air inlet groove 12 is arranged inside the blowing mechanism 1 and communicated with the air inlet 11, the other end of the air inlet groove 12 is a blind end, the air nozzle 13 with a blade shape is arranged along the length direction of the air inlet groove 12, the air nozzle 13 is communicated with the outside, and the air nozzle 13 is arranged obliquely downwards.

The air blowing mechanism 1 further comprises an air bin 14, the air bin 14 is located inside the air blowing mechanism 1, the air bin 14 is arranged along the length direction of the air inlet groove 12, and the air bin 14 is communicated with one side, far away from the air nozzle 13, of the air inlet groove 12. In this embodiment, the blowing mechanism 1 is provided with the gas bin 14, which is beneficial to outflow of the shielding gas with excessive buffer memory, and effectively avoids external source flow fluctuation and avoids gas flow velocity change.

Wherein the air chamber 14 is communicated with the air inlet groove 12 through a plurality of air inlet holes 15.

As shown in fig. 2, the whole blowing mechanism 1 is of a rectangular block structure, and the bottom surface of the blowing mechanism 1 is a plane, so that the inclination angle of the shielding gas can be conveniently controlled.

In this embodiment, the air blowing mechanism 1 is a split structure, as shown in fig. 1, the air blowing mechanism 1 includes a first module 16 and a second module 17, and the first module 16 and the second module 17 are connected and then spliced to form the air inlet 11, the air inlet groove 12, the air nozzle 13, the air bin 14, and the air inlet 15. Namely: first module 16 and second module 17 can be along air inlet 11, air inlet duct 12, air cock 13, air chamber 14, the plane of symmetry of inlet port 15 is cut apart, the bottom surface of first module 16 includes air inlet 11, air inlet duct 12, air cock 13, air chamber 14, the first half of inlet port 15, the top surface of second module 17 includes air inlet 11, air inlet duct 12, air cock 13, air chamber 14, the latter half of inlet port 15, of course, also can not cut apart by the plane of symmetry, as long as can form complete air inlet 11 after first module 16 splices with second module 17, air inlet duct 12, air cock 13, air chamber 14, inlet port 15 can. The first module 16 and the second module 17 are connected through bolts in a sealing manner, so that air leakage is avoided, and protective air is ensured to flow out of the air inlet 11 and the air inlet groove 12 and the air nozzle 13.

In this embodiment, the detachable structure of the first module 16 and the second module 17 is adopted, so as to facilitate cleaning of the internal air path structure of the device.

In this embodiment, the inclination angle of the air nozzle 13 is 25 ° to 30 °. Because the protective gas blowing angle is 25 ℃, the angle is lower than the angle, the air is more easily drawn into the protective gas atmosphere due to the action of fluid pressure, and when the protective gas blowing angle is more than 30 ℃, the protective gas directly acts on the welding surface to cause weld seam depression. The gas discharged from the nozzle 13 is in a blade shape. The angle between the shielding gas flow and the workpiece to be welded is preferably 25 degrees.

The height of the end point position of the air nozzle 13 is 10mm-18mm away from the bottom surface of the air blowing mechanism 1. I.e. the distance between the gassing site and the welding action site is 10-18mm, preferably 13mm.

In this embodiment, a module end side panel laser welding gas blowing device still includes air inlet throttle valve 3, air inlet throttle valve 3 connect blow on the connector 2 for control air intake flow, protective gas flow control is at 10L/min to 15L/min, through setting up protective gas flow and beginning to end from 0, once weld the experiment every 5L/min, wherein welding length 30mm, the example: 0. and 5, 10, 15 and 20 are analogized in sequence, appearance evaluation is carried out on the welding sample, and tension tests show that the protective gas atmosphere can completely cover the welding area, surrounding air is effectively exhausted, and the phenomenon that the molten pool is formed inconsistently and the molten pool overflows due to overlarge protective gas flow is avoided.

The use process of the embodiment is as follows:

first, in this embodiment, the module end plate is preferably made of 6061 aluminum alloy, and the module side plate is preferably made of 5083H112 aluminum alloy.

Using a YSL-6000-AMB laser as a laser light source, using a galvanometer welding system as a laser projection scheme, and preferably setting laser parameters as follows: laser power: 3600kw, laser movement speed: 40mm/s, laser defocusing amount: +0.5mm, galvanometer oscillation type: circle, circle of oscillation diameter: 3mm, oscillating frequency of the galvanometer: 50Hz. The welding length is preferably 30mm, and the laser movement direction is preferably from top to bottom.

The protective gas is one or a mixture of nitrogen, neon, argon, krypton, xenon and radon, and the protective gas cannot be helium because the gas is ionized by high-temperature plasma generated by a molten pool when an aluminum alloy material is welded, and the influence of plasma cloud is more serious. The influence of plasma generated above a molten pool on welding energy shielding during welding is avoided by controlling the type of the protective gas.

Fixing the module end side plate laser welding blowing device at one side or two sides of a welding action position, ensuring that an inclination angle of an air nozzle 13 is intersected with the welding position of a workpiece, ensuring that protective gas can be aligned on the workpiece, connecting a protective gas source into a blowing mechanism 1 through a blowing connector 2, and connecting the flow of the protective gas into an electronic digital display flow control valve through a gas path for adjustment; the opening and closing of the shielding gas are controlled by the electromagnetic valve connected into the gas circuit, the PLC controls the electromagnetic valve to be opened 3 seconds before welding starts, the shielding gas is introduced, and the electromagnetic valve is closed and the shielding gas is closed 3 seconds after welding.

The welding included angle between the protective gas flow and the workpiece is 25 degrees, so that the welding appearance is improved, welding spatter is eliminated, and the welding effect is ensured.

In the welding process, gas in the protective gas source sequentially enters the gas inlet 11 through the blowing connector 2, flows into the gas inlet groove 12 through the buffer action of the gas bin 14, is sprayed out through the gas nozzle 13, and forms a stable protective gas atmosphere in a welding area. And then welding the end side plate workpiece.

This embodiment introduces protective gas through the joint 2 of blowing, final gas is spout by the air cock 13 of sword form, the gas forms the downward air curtain form of slope in the air cock 13, protective gas forms stable protective gas atmosphere at the welding area, this embodiment can use the inert gas of non-helium as protective gas, gas is difficult to the ionized when the welding, and can blow away the plasma above the molten bath, laser energy direct action is on the welding surface, be difficult to the dissipation, gas slope sets up downwards can reduce the air and is drawn into in the protective gas, can avoid protective gas direct action welding surface to lead to the welding seam to cave in again. Compared with coaxial direct blowing, the method can enable the protective gas atmosphere to be continuous, stable and effectively avoid air from being involved. The protective gas blowing nozzle is in a strip shape, so that the protective gas is uniformly distributed, a stable atmosphere area is formed, the flow speed of the protective gas is further reduced, and the forming effect of a welding pool is good. Compared with the traditional non-blown protective gas protection welding, the air blowing method has the advantages that the internal temperature of the welding area is greatly reduced, and the internal structure of the battery is effectively protected from being influenced by high temperature; the blowing device has the advantages of simple structure, convenient processing and low cost, and the blowing device is of a two-piece detachable structure and is convenient for cleaning the internal gas path structure of the blowing device.

The embodiment has the advantages that the appearance effect after welding is displayed, the appearance presents smooth and regular-shaped 'fish scale patterns', and the welding effect is good.

Example two:

as shown in fig. 2, this embodiment further includes a fast clamping mechanism 4 on the basis of the first embodiment, the fast clamping mechanism 4 is connected to the top fast clamping mechanism 4 of the air blowing mechanism 1, so that the air blowing mechanism 1 can be quickly installed at a welding position, and when working, the lower bottom surface of the air blowing mechanism 1 presses against a workpiece to be welded, and can serve as a welding fixture.

The device is characterized by further comprising a connecting and positioning rod 5, wherein one end of the connecting and positioning rod 5 is fixedly connected with the blowing mechanism 1, and one end of the connecting and positioning rod 5 is connected with the quick clamping mechanism 4 in a sliding mode. When the module welding tool is used, the stacked modules are placed in the module welding tool; as shown in fig. 2, the blowing mechanism 1 is fastened on the quick clamping mechanism 4 through connecting positioning rods; and pressing down to fix the side plate of the module to be welded.

The connecting and positioning rod can ensure that the quick clamping mechanism 4 slides up and down along the connecting and positioning rod, and plays a role in guiding and limiting.

Comparative example 1:

in the comparative example, the position relation of the module in the tool is consistent with that of the embodiment, and in the comparative example, the end side plate workpiece is welded without introducing shielding gas into the shielding gas blowing device, namely, without adding the shielding gas.

In this comparative example, a YSL-6000-AMB laser was used as the laser source, a galvanometer welding system was used as the laser projection scheme, and the laser parameters were set as: laser power: 3600kw, laser movement speed: 40mm/s, laser defocusing amount: +0.5mm, galvanometer oscillation type: circle, circle of oscillation diameter: 3mm, oscillating frequency of the galvanometer: 50Hz.

In the present comparative example, the module end plate is preferably 6061 aluminum alloy material, the module side plate is preferably 5083H112 aluminum alloy material

In the present comparative example, the welding length is preferably 30mm, and the laser moving direction is preferably welding from above to below.

In the present comparative example, the gas outlet nozzle was located 13mm from the laser welding action position.

The appearance of the welded product of the comparative example 1 is rough and irregular fish scale patterns, and the product is obviously black, according to the actual result of the porosity test result, CT scan analysis is carried out, and the numerical value shows that the porosity of the example 1 is reduced by 34.73 percent compared with that of the comparative example 1.

Comparative example 2:

the shield gas flow was set to start from 0 to end at every 5L/min for a welding experiment with a welding length of 30mm, for example: 0. and 5, 10, 15 and 20 are analogized in sequence, appearance evaluation and tension test are carried out on the welding sample, and the table below shows that the protective gas flow quantity and the protective gas flow quantity are controlled to be 10L/min to 15L/min, so that the effect is better.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. The laser welding air blowing device for the side plates of the module is characterized by comprising an air blowing mechanism and an air blowing connector, wherein the air blowing mechanism comprises an air inlet, an air inlet groove and an air nozzle, the air blowing connector is connected with the air inlet, the air inlet groove is formed in the air blowing mechanism and is communicated with the air inlet, the other end of the air inlet groove is a blind end, the air nozzle in a blade shape is arranged along the length direction of the air inlet groove, the air nozzle is communicated with the outside, and the air nozzle is obliquely and downwards arranged.

2. The laser welding blowing device for the module end side plates as claimed in claim 1, wherein the blowing mechanism further comprises an air chamber, the air chamber is located inside the blowing mechanism, the air chamber is arranged along the length direction of the air inlet groove, and the air chamber is communicated with one side of the air inlet groove, which is far away from the air faucet.

3. The laser welding blowing device for the end side plates of the die set as claimed in claim 2, wherein the air chamber is communicated with the air inlet groove through a plurality of air inlets.

4. The laser welding air blowing device for the module end side plates as claimed in claim 1, wherein the inclination angle of the air nozzle is 25-30 °.

5. The laser welding gas blowing device for the module end side plates as claimed in claim 1, wherein the gas blowing mechanism is of a split structure and comprises a first module and a second module, and the first module and the second module are connected and then spliced to form the gas inlet, the gas inlet groove and the gas nozzle.

6. The laser welding gas blowing device for the module end side plates as claimed in claim 1, wherein the gas blowing mechanism is integrally in a rectangular block structure, and the bottom surface of the gas blowing mechanism is a plane.

7. The laser welding and air blowing device for the module end side plates as claimed in claim 1, wherein the height of the terminal position of the air nozzle is 10mm-18mm away from the bottom surface of the air blowing mechanism.

8. The modular end panel laser welding blowable apparatus of claim 1 further comprising an air intake throttle valve connected to said blowable fitting.

9. The modular end panel laser welding blow down apparatus of claim 1 further comprising a quick clamp mechanism coupled to a top surface of said blow down mechanism.

10. The gas blowing device for laser welding of end plates of a module according to claim 9, further comprising a connecting positioning rod, wherein one end of the connecting positioning rod is fixedly connected with the gas blowing mechanism, and one end of the connecting positioning rod is slidably connected with the quick clamping mechanism.

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