Busbar welding device and welding method

Abstract

This invention provides a busbar welding device and method thereof. The busbar welding device includes a fume extraction chamber, a pressure head assembly, a laser, and a pressure sensor. A fume extraction cavity is formed inside the fume extraction chamber. The pressure head is connected to the bottom of the fume extraction chamber via an elastic element. The pressure head has a through hole opposite to the fume extraction cavity, an air inlet, and a pressure relief groove. The through hole communicates with the air inlet. The laser is positioned opposite to the fume extraction cavity. In the busbar welding device provided by this invention, during the movement of the fume extraction chamber, the pressure sensor detects that when the elastic element is in a compressed state, both ends of the pressure head contact the fume extraction chamber and the busbar, and the fume extraction cavity communicates with the through hole, thereby controlling the laser head welding and utilizing the negative pressure in the fume extraction chamber to absorb smoke near the welding point. When the elastic element is in a stretched state, both ends of the pressure head separate from the fume extraction chamber and the busbar, and the fume extraction cavity separates from the through hole, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to a busbar welding device and its welding method. Background Technology

[0002] With the development of new energy sources, batteries are being used more and more widely. Power batteries typically operate at high current and voltage, and busbars are a common method for connecting power batteries. This method involves welding individual cells together, but traditional welding techniques are prone to problems such as incomplete soldering and burn-through.

[0003] To address the aforementioned issues, current battery module busbar welding devices use pressure heads to press the busbars together before welding them with a laser. However, existing welding equipment cannot detect and control the pressing state of the pressure head, and the welding process generates significant fumes, affecting the welding effect of the busbars. Summary of the Invention

[0004] This invention provides a busbar welding device and welding method to solve the problem of excessive fumes during the welding process, which affects the welding effect of the busbar.

[0005] This invention provides a busbar welding apparatus for welding a busbar to a welding point on a battery module, comprising:

[0006] A smoke extraction box, wherein a smoke extraction cavity is formed inside the smoke extraction box;

[0007] A pressure head assembly includes a pressure head and an elastic element; the pressure head is connected to the bottom of the smoke extraction box through the elastic element, a through hole is formed inside the pressure head that is opposite to the smoke extraction cavity, a pressure relief groove is provided on the bottom wall of the pressure head, and a plurality of air inlets are provided on the peripheral wall of the pressure head, the through hole is connected to the air inlets, and the airflow ejected from the air inlets acts on the welding point;

[0008] A laser is disposed opposite to the smoke extraction cavity, and the laser beam emitted by the laser passes through the smoke extraction cavity and the through hole in sequence to weld the welding point;

[0009] A pressure sensor is used to detect the pressure between the pressure head and the smoke extraction box;

[0010] During the movement of the smoke extraction box, when the elastic element is in a compressed state, both ends of the pressure head abut against the smoke extraction box and the manifold, and the smoke extraction cavity is connected to the through hole; when the elastic element is in a stretched state, both ends of the pressure head separate from the smoke extraction box and the manifold, and the smoke extraction cavity separates from the through hole.

[0011] According to an embodiment of the present invention, the busbar welding apparatus includes an outer peripheral wall and an inner peripheral wall coaxially arranged, an airflow channel is formed between the outer peripheral wall and the inner peripheral wall, the air inlet is connected to the airflow channel, and the airflow channel sprays airflow circumferentially toward the welding point.

[0012] According to an embodiment of the present invention, the bottom wall of the inner peripheral wall is a wedge-shaped surface, and the wedge-shaped surface is inclined downward from the outer wall of the inner peripheral wall toward its inner wall.

[0013] According to an embodiment of the present invention, a busbar welding apparatus is provided in which a plurality of spaced air inlets are provided on the peripheral wall of the pressure head, the through hole is connected to each of the air inlets, the airflow ejected from each of the air inlets acts on the welding point, and the angle between the beam emitted by the laser and the airflow is an acute angle.

[0014] According to an embodiment of the present invention, a busbar welding apparatus is provided with a plurality of air inflators inclined downward on the inner wall of the pressure head, and each air inflator is connected to a corresponding air inlet, so that the air outlet of each air inflator acts on the welding point.

[0015] According to an embodiment of the present invention, a busbar welding apparatus is provided, the busbar welding apparatus further comprising:

[0016] A smoke extraction pipe is provided at the bottom of the smoke extraction box, the smoke extraction pipe is connected to the smoke extraction cavity, and the smoke extraction pipe is arranged opposite to the through hole;

[0017] When the elastic element is in a compressed state, both ends of the pressure head abut against the smoke extraction pipe and the manifold, respectively, and the smoke extraction pipe is connected to the through hole; when the elastic element is in a compressed state, both ends of the pressure head are separated from the smoke extraction pipe and the manifold, and the smoke extraction pipe is separated from the through hole.

[0018] According to an embodiment of the present invention, the top of the pressure head is provided with a first positioning groove for matching the smoke extraction pipe, and the bottom of the pressure head is provided with a second positioning groove for matching the busbar. The two ends of the through hole are respectively disposed in the first positioning groove and the second positioning groove.

[0019] When the elastic element is in a compressed state, the first positioning groove is connected to the smoke extraction pipe, and the second positioning groove is in contact with the manifold. When the elastic element is in a compressed state, the first positioning groove is separated from the smoke extraction pipe, and the second positioning groove is separated from the manifold.

[0020] According to an embodiment of the present invention, a busbar welding device is provided with a plurality of spaced pressure relief grooves on the peripheral wall of the bottom of the pressure head, and each pressure relief groove is connected to the through hole.

[0021] According to an embodiment of the present invention, a busbar welding apparatus is provided, the busbar welding apparatus further comprising:

[0022] An insulating plate is connected between the smoke extraction box and the elastic element. The insulating plate has a mounting hole that communicates with the smoke extraction cavity. One end of the smoke extraction tube passes through the mounting hole. The pressure head is connected to the smoke extraction box in sequence through the elastic element and the insulating plate.

[0023] According to an embodiment of the present invention, the busbar welding device further includes: a smoke exhaust pipe, a smoke extraction device, and a filter device. The smoke exhaust pipe is connected to the smoke extraction box, and the smoke exhaust pipe is connected to the air inlet in sequence through the smoke extraction device and the filter device.

[0024] This invention also provides a welding method for a busbar welding device, comprising:

[0025] During the process of the pressure head moving towards the manifold, the pressure between the pressure head and the smoke extraction box is obtained;

[0026] When the pressure reaches the preset pressure, the laser is controlled to weld the busbar, and protective gas is injected into the welding point through the air inlet.

[0027] The busbar welding device provided by this invention, during the movement of the fume extraction box, is detected by a pressure sensor. When the elastic element is in a compressed state, the two ends of the pressure head abut against the fume extraction box and the busbar, and the fume extraction chamber is connected to the through hole, thereby controlling the laser head welding and utilizing the negative pressure in the fume extraction box to absorb smoke and dust near the welding point. When the elastic element is in a stretched state, the two ends of the pressure head separate from the fume extraction box and the busbar, and the fume extraction chamber separates from the through hole, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a busbar welding device provided in an embodiment of the present invention;

[0030] Figure 2 This is a front view of the pressure head provided in an embodiment of the present invention;

[0031] Figure 3 yes Figure 2 Schematic diagram of section AA;

[0032] Figure 4 This is a top view of the pressure head provided in an embodiment of the present invention;

[0033] Figure 5 This is a three-dimensional structural diagram of the pressure head provided in an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of a pressure head provided in another embodiment of the present invention;

[0035] Figure 7 This is a schematic flowchart of a welding method provided in an embodiment of the present invention;

[0036] Reference numerals: 10, smoke extraction box; 100, through hole; 20, pressure head assembly; 200, pressure head; 201, elastic element; 202, pressure relief groove; 203, air inlet; 204, air filling pipe; 2001, outer peripheral wall; 2002, inner peripheral wall; 2003, airflow channel; 30, smoke extraction pipe; 40, insulating plate; 50, drive mechanism; 60, position sensor; 70, smoke exhaust pipe. Detailed Implementation

[0037] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0038] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] This invention provides a busbar welding device, such as... Figures 1 to 5 As shown, the busbar welding device is used to weld the busbar to the welding point of the battery module, and includes: a smoke extraction box 10, a pressure head assembly 20, a laser, and a pressure sensor.

[0042] The smoke extraction box 10 contains a smoke extraction chamber, which can be connected to an external smoke extraction device or have a smoke extraction device installed directly within it, thereby creating negative pressure within the chamber. The pressure head assembly 20 mainly includes a pressure head 200 and an elastic element 201. The pressure head 200 acts directly on the manifold to press it. In this embodiment, the pressure head 200 is connected to the bottom of the smoke extraction box 10 via the elastic element 201. The elastic element 201 can be a spring or sheet, and one or more can be provided according to user needs. To ensure balanced pressure on the manifold, when multiple elastic elements 201 are provided, they are symmetrically arranged along the welding points of the manifold.

[0043] To facilitate busbar welding, a through hole 100 is formed inside the pressure head 200, which is positioned opposite to the fume extraction chamber. A pressure relief groove 202 is provided on the bottom wall of the pressure head 200, and multiple air inlets 203 are provided on the peripheral wall of the pressure head 200 for introducing protective gas. The through hole 100 communicates with the air inlets, so that the airflow (protective gas) ejected from the air inlets acts on the welding point. The laser is positioned opposite to the fume extraction chamber, and the laser beam emitted by the laser passes sequentially through the fume extraction chamber and the through hole 100 to weld the welding point; that is, the laser's output port is aligned with the welding point through the fume extraction chamber and the through hole 100.

[0044] In order to absorb fumes only near the welding point during the welding process, the busbar welding device is also equipped with a pressure sensor, which is located between the top of the fume extraction box 10 and the pressure head 200. The pressure sensor is used to detect the pressure between the pressure head 200 and the fume extraction box 10.

[0045] During the movement of the fume extraction box 10, the pressure sensor detects the pressure between the pressure head 200 and the fume extraction box 10. When the elastic element 201 is in a compressed state and the pressure reaches the preset pressure, it indicates that the pressure head 200 has successfully docked with the fume extraction box 10. Both ends of the pressure head 200 are in contact with the fume extraction box 10 and the manifold. The fume extraction chamber is connected to the through hole 100, thereby controlling the laser head welding. The negative pressure in the fume extraction box 10 absorbs the smoke and dust near the welding point, and protective gas is injected into the welding point through the air inlet 203. At this time, the protective gas can enter the fume extraction chamber through the through hole 100 under the action of negative pressure, and is discharged along with the smoke and dust.

[0046] When the elastic element 201 is in a stretched state, if the pressure does not reach the preset pressure, the two ends of the pressure head 200 are separated from the fume extraction box 10 and the manifold, and the fume extraction chamber is separated from the through hole 100. This allows the laser to be controlled to stop welding and to stop fume extraction near the welding point, while also stopping the blowing of protective gas.

[0047] The busbar welding device provided in this embodiment of the invention, during the movement of the fume extraction box, is detected by a pressure sensor. When the elastic element is in a compressed state, the two ends of the pressure head abut against the fume extraction box and the busbar, and the fume extraction chamber is connected to the through hole, thereby controlling the laser head welding and utilizing the negative pressure in the fume extraction box to absorb smoke and dust near the welding point. When the elastic element is in a stretched state, the two ends of the pressure head separate from the fume extraction box and the busbar, and the fume extraction chamber separates from the through hole, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point.

[0048] It should be noted that, depending on the user's needs, a pressure sensor can be added and placed at the bottom of the pressure head 200. In this case, the pressure sensor is used to detect the pressure between the pressure head 200 and the manifold.

[0049] During the movement of the fume extraction chamber 10, the pressure sensor detects the pressure between the pressure head 200 and the manifold. When the elastic element 201 is compressed and the pressure reaches the preset pressure, it indicates that the pressure head 200 and the manifold are in position, with both ends of the pressure head 200 contacting the fume extraction chamber 10 and the manifold. The fume extraction chamber is connected to the through hole 100, thereby controlling the laser head welding. The negative pressure in the fume extraction chamber absorbs the smoke and dust near the welding point, and protective gas is injected into the welding point through the air inlet. The preset pressure can be adjusted to ensure that the pressure head presses firmly against the manifold, preventing the manifold from shifting during welding.

[0050] When the elastic element 201 is in a stretched state, if the pressure does not reach the preset pressure, it means that the pressure head 200 has not yet reached its position. The two ends of the pressure head 200 are separated from the fume extraction box 10 and the manifold, and the fume extraction chamber is separated from the through hole 100. This allows the laser to be controlled to stop welding and to stop fume extraction near the welding point, while also stopping the blowing of protective gas.

[0051] This invention provides a busbar welding device, such as... Figure 1 and Figure 6 As shown, the pressure head 200 includes an outer peripheral wall 2001 and an inner peripheral wall 2002 arranged coaxially. An airflow channel 2003 is formed between the outer peripheral wall 2001 and the inner peripheral wall 2002. One side of the airflow channel 2003 is connected to the air inlet 203. At the same time, the bottom of the airflow channel 2003 is provided with an annular outlet, so that the airflow channel 2003 can spray airflow circumferentially toward the welding point.

[0052] In this embodiment, the upper sides of the inner peripheral wall 2002 and the outer peripheral wall 2001 are connected to form an upper sealed airflow channel 2003. The bottom of the airflow channel 2003 is provided with an annular outlet. The protective gas sprayed by the airflow channel 2003 is along the circumference of the welding point, so that during the laser welding process, the airflow sprayed by the airflow channel 2003 can protect the vicinity of the welding point.

[0053] Furthermore, the bottom of the inner peripheral wall 2002 is a wedge-shaped surface. The wedge-shaped surface is inclined downward from the outer wall of the inner peripheral wall 2002 towards its inner wall. By setting the bottom of the inner peripheral wall 2002 as a wedge, it can be used to guide the protective gas, adjust the flow direction of the protective gas outflow channel 2003, and make the protective gas spray airflow circumferentially towards the welding point.

[0054] This invention provides a busbar welding device, such as... Figures 2 to 5 As shown, the peripheral wall of the pressure head 200 is provided with multiple spaced air inlets 203. The through hole 100 is connected to each air inlet 203. The airflow ejected from each air inlet 203 acts on the welding point. The angle between the laser beam emitted by the laser and the airflow is an acute angle (greater than 0 degrees and less than 90 degrees). The acute angle is set so that the airflow is ejected towards the welding point.

[0055] When multiple air inlets 203 are set, multiple air inlets 204 can also be set accordingly. Multiple air inlets 204 are inclined downward on the inner wall of the pressure head. Each air inlet 204 is connected to each air inlet 203 respectively, so that the air outlet of each air inlet 204 acts on the welding point. By setting the air inlet 204, the protective gas can be effectively prevented from blowing directly on the laser.

[0056] Meanwhile, the through hole 100 has a large diameter end and a small diameter end. The large diameter end of the through hole 100 is located on the side of the pressure head close to the smoke extraction box 10, and the small diameter end of the through hole 100 is located on the side of the pressure head 200 away from the smoke extraction box 10.

[0057] When the elastic element 201 is in a compressed state, and the pressure reaches the preset pressure, it indicates that the pressure head 200 has completed docking with the fume extraction box 10. Both ends of the pressure head 200 are in contact with the fume extraction box 10 and the manifold. The fume extraction chamber is connected to the through hole 100, thereby controlling the laser head welding. The negative pressure in the fume extraction box 10 absorbs the smoke and dust near the welding point, and protective gas is injected into the welding point through the air inlet. By changing the size of both ends of the through hole 100, the smaller diameter end of the through hole 100 creates greater resistance as the protective gas flows through the air inlet 203. Most of the protective gas, after flowing towards the welding point, is discharged from the larger diameter end of the through hole 100. Under negative pressure, the protective gas can enter the fume extraction chamber through the larger diameter end of the through hole 100, cooperating with the smoke and dust for emission.

[0058] To facilitate the connection of the large-diameter end of the through hole 100, the busbar welding device also includes a fume extraction pipe 30. The fume extraction pipe 30 is located on one side of the fume extraction box 10, communicates with the fume extraction cavity, and is positioned opposite to the through hole 100.

[0059] During the movement of the fume extraction box 10, the pressure sensor detects the pressure between the pressure head 200 and the fume extraction box 10. When the elastic element 201 is in a compressed state and the pressure reaches the preset pressure, it indicates that the pressure head 200 has completed its connection with the fume extraction pipe 30. The two ends of the pressure head are in contact with the fume extraction pipe and the manifold, respectively. The fume extraction pipe 30 is connected to the through hole 100, thereby controlling the laser head welding. The negative pressure in the fume extraction box 10 absorbs the smoke and dust near the welding point, and protective gas is injected into the welding point through the air inlet 203. At this time, the protective gas can enter the fume extraction chamber through the through hole under the action of negative pressure, and is discharged together with the smoke and dust.

[0060] When the elastic element 201 is under tension, and the pressure has not reached the preset pressure, both ends of the pressure head 200 separate from the fume extraction pipe and the manifold, and the fume extraction pipe 30 separates from the through hole 100. This allows the laser to be controlled to stop welding, stop fume extraction near the welding point, and stop blowing in the protective gas.

[0061] To facilitate the connection between the smoke extraction pipe 30 and the manifold, in this embodiment, the top of the pressure head 00 is constructed with a first positioning groove for matching the smoke extraction pipe 30, and the bottom of the pressure head 200 is constructed with a second positioning groove for matching the manifold. The two ends of the through hole 100 are respectively located in the first positioning groove and the second positioning groove.

[0062] When the elastic element 201 is in a compressed state, the first positioning groove aligns with the fume extraction pipe 30, and the second positioning groove abuts against the manifold. This allows for control of the laser head welding and utilizes the negative pressure in the fume extraction box 10 to absorb smoke and dust near the welding point. Protective gas is then introduced into the welding point through the air inlet 203. At this time, the protective gas, under negative pressure, enters the fume extraction chamber through the through-hole, coordinating with the smoke and dust for emission.

[0063] When the elastic element 201 is in a compressed state, the first positioning groove separates from the fume extraction pipe 30, and the second positioning groove separates from the busbar. This allows the laser to be controlled to stop welding, stop fume extraction near the welding point, and stop blowing in the protective gas.

[0064] Based on the above embodiments, in one embodiment provided by the present invention, as follows: Figures 1 to 3 As shown, the bottom peripheral wall of the pressure head is provided with multiple spaced pressure relief grooves 202, each of which is connected to the through hole 100. The number and shape of the pressure relief grooves 202 can be adjusted according to the magnitude of the negative pressure and the structure of the manifold. By setting the pressure relief grooves 202 to relieve pressure, when a negative pressure is formed in the through hole 100 of the pressure head 200, the connection between the pressure head 200 and the manifold is avoided after the pressure head 200 is pressed down, making it easier for the user to separate the pressure head from the manifold.

[0065] Based on the above embodiments, in one embodiment provided by the present invention, as follows: Figures 1 to 3 As shown, the busbar welding device also includes an insulating plate 40. The insulating plate 40 can be made of rubber or other insulating materials. The insulating plate 40 is connected between the fume extraction box 10 and the elastic element 201. The insulating plate 40 has a mounting hole communicating with the fume extraction cavity. One end of the fume extraction pipe 30 passes through the mounting hole. The pressure head 200 is connected to the fume extraction box 10 in sequence through the elastic element and the insulating plate. Thus, both the pressure head 200 and the elastic element 201 are connected to the fume extraction box 10 through the insulating plate 40, preventing the pressure head 200 and the elastic element 201 from becoming electrified during the welding process and affecting the welding.

[0066] In addition, the busbar welding device also includes a drive mechanism 50, which is connected to one side of the smoke extraction box 10 and is used to drive the smoke extraction box to move.

[0067] The driving mechanism includes a first displacement device and a second displacement device. Both the first and second displacement devices can be lead screws. The first displacement device has a first mounting plate that is slidable along the Z-axis. The second displacement device is mounted on the first mounting plate and has a second mounting plate that is slidable along the X-axis. A smoke extraction box 10 is mounted on the second mounting plate.

[0068] During operation, two displacement devices are set up. The first displacement device can adjust the height of the smoke extraction box 10, thereby adjusting the relative height between the pressure head 200 and the manifold. The second displacement device can adjust the horizontal position of the smoke extraction box, thereby adjusting the corresponding position between the pressure head 200 and the manifold, so that the pressure head 200 can be aligned with the manifold.

[0069] Correspondingly, the busbar welding device also includes: a position sensor 60, which may be a vision sensor. The position sensor 60 is installed on the smoke extraction box 10 or other structures. The position sensor 60 is used to detect the position of the busbar so that the pressure head 200 can be aligned with the busbar and weld the busbar to the welding point of the battery module.

[0070] During operation, the position sensor 60 detects the position of the manifold and first controls the second displacement device to align the pressure head 200 with the manifold. Then, the first displacement device controls the relative height between the pressure head 200 and the manifold. As the fume extraction box 10 moves vertically, the pressure sensor detects the pressure between the pressure head 200 and the fume extraction box 10. When the elastic element 201 is compressed and the pressure reaches the preset pressure, it indicates that the pressure head 200 has successfully connected with the fume extraction pipe 30. The two ends of the pressure head 200 are in contact with the fume extraction pipe 30 and the manifold, respectively. The fume extraction pipe 30 is connected to the through hole 100, thereby controlling the laser head welding. The negative pressure in the fume extraction box 10 absorbs the smoke near the welding point and injects protective gas into the welding point through the air inlet 203. At this time, the protective gas can enter the fume extraction chamber through the through hole 100 under the action of negative pressure, and is discharged along with the smoke.

[0071] Based on the above embodiments, in one embodiment provided by the present invention, as follows: Figures 1 to 3 As shown, the busbar welding device also includes: a smoke exhaust pipe 70, a smoke extraction device, and a filtration device.

[0072] The exhaust pipe 70 is connected to the smoke extraction box, with one end of the exhaust pipe 70 connected to the smoke extraction chamber. The smoke extraction device works in conjunction with the exhaust pipe to provide a negative pressure environment for the smoke extraction chamber. The filter device filters out smoke and dust, and the other end of the exhaust pipe 70 is connected to the air inlet via the smoke extraction device and the filter device in sequence.

[0073] In this embodiment, during the laser head welding process, the negative pressure in the fume extraction chamber 10 is used to absorb the smoke and dust near the welding point, and protective gas is injected into the welding point through the air inlet 203. At this time, the protective gas can enter the fume extraction chamber through the through hole 100 under the action of negative pressure, and together with the smoke and dust, it passes through the exhaust pipe 70, the fume extraction device, and finally enters the filtration device. After the filtration device filters the gas, it can be pressurized again and re-enter the through hole 100 of the pressure head 200 through the air inlet 203. By setting up the exhaust pipe 70, the fume extraction device, and the filtration device, not only is the smoke and dust effectively removed, but the protective gas can also be recycled, reducing equipment wear and tear.

[0074] The present invention also provides a welding method for a busbar welding device, the busbar welding device being as follows: Figures 1 to 6 As shown, I will not repeat myself here.

[0075] like Figure 7 As shown, the welding method includes the following steps:

[0076] Step S710: During the process of the pressure head moving towards the manifold, obtain the pressure between the pressure head and the smoke extraction box;

[0077] Step S720: When the pressure reaches the preset pressure, control the laser to weld the busbar and inject protective gas into the welding point through the air inlet.

[0078] Specifically, before the pressure head 200 moves toward the busbar, the position sensor detects the position of the busbar and controls the second displacement device to set the pressure head 200 relative to the busbar. Then, the first displacement device controls the relative height between the pressure head 200 and the busbar.

[0079] As the pressure head 200 moves downwards, it moves towards the manifold. The pressure sensor detects the pressure between the pressure head 200 and the fume extraction chamber 10. When the elastic element 201 is compressed and the pressure reaches the preset pressure, it indicates that the pressure head 200 has successfully docked with the fume extraction chamber 10. Both ends of the pressure head 200 contact the fume extraction chamber 10 and the manifold, and the fume extraction chamber is connected to the through-hole 100. This allows control of the laser head welding and utilizes the negative pressure in the fume extraction chamber 10 to absorb smoke and dust near the welding point. Protective gas is then introduced into the welding point through the air inlet 203. At this time, the protective gas, under negative pressure, enters the fume extraction chamber through the through-hole 100 and is discharged along with the smoke and dust.

[0080] When the elastic element 201 is in a stretched state, if the pressure does not reach the preset pressure, the two ends of the pressure head 200 are separated from the fume extraction box 10 and the manifold, and the fume extraction chamber is separated from the through hole 100. This allows the laser to be controlled to stop welding and to stop fume extraction near the welding point, while also stopping the blowing of protective gas.

[0081] The welding method of the busbar welding device provided by this invention, during the movement of the fume extraction box, is detected by a pressure sensor. When the elastic element is in a compressed state, the two ends of the pressure head abut against the fume extraction box and the busbar, and the fume extraction chamber is connected to the through hole, thereby controlling the laser head welding and utilizing the negative pressure in the fume extraction box to absorb smoke and dust near the welding point. When the elastic element is in a stretched state, the two ends of the pressure head separate from the fume extraction box and the busbar, and the fume extraction chamber separates from the through hole, thereby controlling the laser to stop welding and stopping the extraction of smoke near the welding point.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0083] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. A busbar welding device, characterized in that, Used for soldering busbars to the solder joints of battery modules, including: A smoke extraction box, wherein a smoke extraction cavity is formed inside the smoke extraction box; A pressure head assembly includes a pressure head and an elastic element; the pressure head is connected to the bottom of the smoke extraction box through the elastic element, a through hole is formed inside the pressure head that is opposite to the smoke extraction cavity, a pressure relief groove is provided on the bottom wall of the pressure head, and a plurality of air inlets are provided on the peripheral wall of the pressure head, the through hole is connected to the air inlets, and the airflow ejected from the air inlets acts on the welding point; A laser is disposed opposite to the smoke extraction cavity, and the laser beam emitted by the laser passes through the smoke extraction cavity and the through hole in sequence to weld the welding point; A pressure sensor is used to detect the pressure between the pressure head and the smoke extraction box; The pressure head includes an outer peripheral wall and an inner peripheral wall coaxially arranged, forming an airflow channel between the outer peripheral wall and the inner peripheral wall. The air inlet is connected to the airflow channel, and the airflow channel sprays airflow circumferentially toward the welding point. The bottom wall of the inner peripheral wall is a wedge-shaped surface, which is inclined downward from the outer wall of the inner peripheral wall toward its inner wall. During the movement of the smoke extraction box, when the elastic element is in a compressed state, the two ends of the pressure head abut against the smoke extraction box and the manifold, and the smoke extraction cavity is connected to the through hole. When the elastic element is in a stretched state, the two ends of the pressure head separate from the smoke extraction box and the manifold, and the smoke extraction cavity separates from the through hole.

2. The busbar welding apparatus according to claim 1, characterized in that, The airflow ejected from each of the air inlets acts on the welding point, and the angle between the laser beam emitted by the laser and the airflow is an acute angle.

3. The busbar welding apparatus according to claim 2, characterized in that, The inner wall of the pressure head is provided with multiple air inlets inclined downwards, and each air inlet is connected to the corresponding air inlet so that the air outlet of each air inlet acts on the welding point.

4. The busbar welding apparatus according to claim 1, characterized in that, It also includes a smoke extraction pipe, which is disposed at the bottom of the smoke extraction box. The smoke extraction pipe is connected to the smoke extraction cavity and is disposed opposite to the through hole. When the elastic element is in a compressed state, both ends of the pressure head abut against the smoke extraction pipe and the manifold, respectively, and the smoke extraction pipe is connected to the through hole; when the elastic element is in a compressed state, both ends of the pressure head are separated from the smoke extraction pipe and the manifold, and the smoke extraction pipe is separated from the through hole.

5. The busbar welding apparatus according to claim 4, characterized in that, The top of the pressure head is provided with a first positioning groove for matching the smoke extraction pipe, and the bottom of the pressure head is provided with a second positioning groove for matching the manifold. The two ends of the through hole are respectively located in the first positioning groove and the second positioning groove. When the elastic element is in a compressed state, the first positioning groove is connected to the smoke extraction pipe, and the second positioning groove is in contact with the manifold. When the elastic element is in a compressed state, the first positioning groove is separated from the smoke extraction pipe, and the second positioning groove is separated from the manifold.

6. The busbar welding apparatus according to claim 5, characterized in that, It also includes an insulating plate, which is connected between the smoke extraction box and the elastic element. The insulating plate has a mounting hole that communicates with the smoke extraction cavity. One end of the smoke extraction tube passes through the mounting hole. The pressure head is connected to the smoke extraction box in sequence through the elastic element and the insulating plate.

7. The busbar welding apparatus according to claim 6, characterized in that, The busbar welding device further includes: a smoke exhaust pipe, a smoke extraction device, and a filter device. The smoke exhaust pipe is connected to the smoke extraction box, and the smoke exhaust pipe is connected to the air inlet in sequence through the smoke extraction device and the filter device.

8. A welding method using the busbar welding apparatus as described in any one of claims 1-7, characterized in that, include: During the process of the pressure head moving towards the manifold, the pressure between the pressure head and the smoke extraction box is obtained; When the pressure reaches the preset pressure, the laser is controlled to weld the busbar, and protective gas is introduced into the welding point through the air inlet.

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