Laser welding equipment and battery production line

Abstract

The utility model provides laser welding equipment and a battery production line, and the laser welding equipment comprises a first welding mechanism which comprises a first welding head; the second welding mechanism comprises a second welding head, and the second welding head is located below the first welding head in the vertical direction; wherein the light outlet of the first welding head is configured to face downwards, and the light outlet of the second welding head is configured to face obliquely upwards crossed with the vertical direction. The production efficiency can be improved, and the welding quality can also be improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and more specifically, to a laser welding device and a battery production line. Background Art

[0002] With the rapid development of new energy technologies, the demand for new energy products such as battery devices and energy storage devices continues to increase, which not only puts more requirements on the production efficiency of new energy products, but also puts higher requirements on the reliability of new energy products. Utility Model Content

[0003] The embodiments of the present application provide a laser welding device and a battery production line, which can improve production efficiency and welding quality, thereby improving battery reliability.

[0004] In a first aspect, an embodiment of the present application provides a laser welding device, comprising: a first welding mechanism, comprising a first welding head; a second welding mechanism, comprising a second welding head, and the second welding head is located below the first welding head along the vertical direction; wherein the light outlet of the first welding head is configured to be set downward, and the light outlet of the second welding head is configured to be set obliquely upward and intersecting the vertical direction.

[0005] By means of the first welding head and the second welding head arranged vertically up and down, welding operations can be performed on the upper and lower sides of the top cover and the shell respectively. After the top cover and the shell are positioned and always kept in a snap-fit ​​state, the upper and lower side welding operations can also be completed. Since the light outlet of the second welding head is arranged in an oblique upward direction, the risk of welding slag and other materials falling into the light outlet can be greatly reduced. As a result, the welding quality can be improved, thereby improving the reliability of the battery, and the welding operation can be carried out reliably and stably, thereby improving the welding efficiency.

[0006] In some embodiments, the second welding mechanism includes a first bracket and a first driving mechanism, the second welding head is rotatably connected to the first bracket via a rotating shaft extending along a first direction, the first driving mechanism includes a first driving member, the first driving member is connected to the second welding head, and is used to drive the second welding head to rotate around the rotating shaft, and the first direction is perpendicular to the vertical direction.

[0007] By driving the second welding head to rotate around the rotating shaft through the first driving member, the working direction of the light outlet of the second welding head can be conveniently adjusted, so that the light outlet of the second welding head is set in an oblique upward direction. Thereby, the risk of materials such as welding slag falling and entering the light outlet can be reduced, and it can also adapt to different types of workpieces to be welded, thereby improving the adaptability.

[0008] In some embodiments, the second welding mechanism also includes a second bracket and a second driving mechanism, the first bracket is arranged on the second bracket, the second driving mechanism includes a second driving member and a first slide rail extending along the second direction, the second bracket is slidably connected to the first slide rail, and the driving end of the second driving member is connected to the second bracket for driving the second bracket to slide along the first slide rail, and the second direction intersects with the first direction and is perpendicular to the vertical direction.

[0009] The second driving member drives the second bracket to slide along the first slide rail, so that the first bracket and the second welding head follow the second bracket to slide along the first slide rail, so that when the second welding head is needed for welding, the light outlet of the second welding head can reach the welding position; when the second welding head is not needed for welding, the light outlet of the second welding head can be moved away from the welding position, thereby avoiding the position where welding slag falls during welding of the first welding head above, reducing the risk of welding slag falling and entering the light outlet.

[0010] In some embodiments, the second welding mechanism also includes a third driving mechanism, which includes a third driving member and a second slide rail extending along the vertical direction, the second slide rail is arranged on the second bracket, the first bracket is slidably connected to the second slide rail, and the driving end of the third driving member is connected to the first bracket for driving the first bracket to slide along the second slide rail.

[0011] The first bracket is driven to slide along the second slide rail by the third driving member, and the second welding head follows the first bracket to rise and fall in the vertical direction, so that the light outlet of the second welding head is close to or away from the workpiece to be welded, thereby adjusting the optimal welding distance during laser welding, thereby improving the welding quality.

[0012] In some embodiments, the second welding mechanism further includes a protection component, which is disposed at the light outlet of the second welding head and is used to prevent welding slag from falling into the light outlet of the second welding head.

[0013] By arranging the protective component at the light outlet of the second welding head, the risk of welding slag falling into the light outlet of the second welding head can be further reduced, thereby improving welding reliability.

[0014] In some embodiments, the protection assembly includes a first protection member, the first protection member covers the light outlet of the second welding head, and the first protection member is provided with a light-transmitting portion for allowing the laser to pass through.

[0015] Thus, the first protective member covers the light outlet of the second welding head, and the first protective member is provided with a light-transmitting portion for allowing the laser to pass through, which can further reduce the risk of welding slag entering the light outlet without affecting the laser welding operation.

[0016] In some embodiments, the light-transmitting portion is a through hole; or, the light-transmitting portion is transparent glass.

[0017] The through hole for the laser beam to pass through is provided in the first protective member, thereby reducing the risk of welding slag entering the light outlet without reducing the intensity of the laser beam.

[0018] By using a transparent glass plate as the light-transmitting portion, the risk of falling welding slag entering the light outlet can be completely blocked.

[0019] In some embodiments, the protection assembly further includes a second protection member, the second protection member is provided with an air blowing port, and the direction of the air blowing port is perpendicular to the direction of the light outlet of the second welding head.

[0020] Air is blown through the second protective member to blow the fallen welding slag in a direction away from the light outlet, thereby effectively protecting the components inside the light outlet.

[0021] In some embodiments, the protective assembly also includes a third protective member, which is arranged between the second protective member and the light outlet of the second welding head, and the third protective member includes a first air inlet, a second air inlet, an annular inner cavity and an air outlet, the first air inlet, the second air inlet and the air outlet are all connected to the annular inner cavity, the first air inlet and the second air inlet are respectively located on opposite sides of the annular inner cavity, and the air outlet corresponds to the light outlet of the second welding head.

[0022] By forming an annular airflow in the annular inner cavity, the annular airflow is blown toward the weld position through the air outlet, which can effectively remove foreign matter such as dirt and oxides, thereby improving the welding quality.

[0023] In some embodiments, the laser welding equipment also includes: a dust removal device, which is arranged between the first welding head and the second welding head; the dust removal device includes a dust suction port, a dust suction chamber, a first dust return port and a second dust return port, the dust suction port, the first dust return port and the second dust return port are all connected to the dust suction chamber, the first dust return port and the second dust return port are spaced apart along the second direction, the dust suction port and the first dust return port and the second dust return port are arranged along the first direction, and the first dust return port and the second dust return port are located on both sides of the dust suction port along the second direction, and the first direction, the second direction and the vertical direction are perpendicular to each other.

[0024] By forming an annular airflow in the annular inner cavity, the annular airflow is blown toward the welding position through the air outlet, which can effectively remove foreign matter such as rust, dirt, oxides, etc., thereby improving the welding quality.

[0025] In some embodiments, the laser welding equipment also includes: a welding fixture, which is arranged between the first welding head and the second welding head, and is used to fix the workpiece to be welded; wherein, when the welding fixture clamps the workpiece to be welded, the first welding head and the second welding head respectively perform welding operations on the upper and lower welding positions of the workpiece to be welded.

[0026] The workpiece to be welded is clamped by a welding fixture, so as to be kept in a specified state. While the workpiece to be welded is kept in the specified state, the upper and lower parts of the workpiece to be welded are welded by the first welding head and the second welding head respectively, so as to improve the welding quality.

[0027] In some embodiments, the welding fixture includes: a support frame, used to support the workpiece to be welded, wherein the workpiece to be welded is a battery; a first clamping mechanism, including a pair of first jaws and a fourth driving member, wherein the pair of first jaws are respectively located on opposite sides of the support frame along a first direction, and the fourth driving member is connected to the pair of first jaws, and is used to drive the pair of first jaws to approach or move away from each other along the first direction, thereby clamping or releasing the battery shell; two second clamping mechanisms, respectively located on opposite sides of the support frame along the first direction, each of the second clamping mechanisms includes a pair of second jaws and a fifth driving member, wherein the pair of second jaws are located on opposite sides of the first jaws along a second direction, and the fifth driving member is connected to the pair of second jaws, and is used to drive the pair of second jaws to approach or move away from each other, thereby snapping the top cover of the battery onto the shell.

[0028] The top cover and the shell are buckled together by a welding fixture, and the pre-welding operation of the top cover and the shell with higher quality can be quickly completed in the buckled state, thereby improving production efficiency and welding quality.

[0029] In a second aspect, an embodiment of the present application further provides a battery production line, comprising: the laser welding equipment of the first aspect.

[0030] The above-mentioned laser welding equipment can realize welding operations on the upper and lower sides of the top cover and the shell without loosening the welding fixture and flipping the battery. While improving the welding efficiency, it can also improve the welding quality, thereby improving the reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope.

[0032] Figure 1A schematic diagram of the structure of a laser welding device provided in some embodiments of the present application;

[0033] Figure 2 A schematic diagram of the structure of a second welding mechanism provided in some embodiments of the present application;

[0034] Figure 3 A structural cross-sectional view of a protective assembly provided for some embodiments of the present application;

[0035] Figure 4 A schematic structural diagram of a first protective member provided in some embodiments of the present application;

[0036] Figure 5 A schematic diagram of the structure of a second protective member provided in some embodiments of the present application;

[0037] Figure 6 A schematic diagram of the structure of a dust removal device provided in some embodiments of the present application;

[0038] Figure 7 A schematic diagram of the structure of a welding fixture provided in some embodiments of the present application.

[0039] icon:

[0040] 100-laser welding equipment; 10-first welding mechanism; 11-first welding head; 20-second welding mechanism; 21-second welding head; 21a-light outlet; 22-first bracket; 23-first driving mechanism; 24-rotating shaft; 25-second bracket; 26-second driving mechanism; 28-protection assembly; 261-second driving member; 262-first slide rail; 281-first protective member; 281a-light-transmitting portion; 282-second protective member; 282a-air outlet; 283-third protective member; 283 1-first air inlet; 2832-second air inlet; 2833-annular inner cavity; 2834-air outlet; 30-dust removal device; 31-dust suction port; 32-dust suction cavity; 33-first dust return port; 34-second dust return port; 40-welding fixture; 41-support frame; 42-first clamping mechanism; 43-second clamping mechanism; 421-first clamping jaw; 422-fourth driving member; 431-second clamping jaw; 432-fifth driving member; E-battery; X-first direction; Y-second direction; Z-vertical direction. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0045] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] At present, from the perspective of market development, the application of new energy technologies is becoming more and more extensive. Taking batteries as an example, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as electric tools, drones, energy storage equipment and other fields. With the continuous expansion of battery application areas, the market demand is also constantly expanding, so higher requirements are placed on battery production efficiency. In addition, higher requirements are also placed on the reliability of battery processing.

[0047] In the production and manufacturing process of batteries, often one assembly section requires multiple processes. At present, multiple processes are concentrated in one workstation, that is, multiple processes are completed in sequence at one workstation, resulting in that when the action of the previous process is completed, it is necessary to wait for the action of the last process to be completed before the next round of process operations can be carried out. As a result, there is a problem of low production efficiency.

[0048] For example, in the pre-welding assembly section of the top cover and shell of the battery, in order to improve the welding quality of the top cover and shell, it is necessary to position them first and then weld them. At present, the positioning step and the welding step of the top cover and shell are carried out in the same station. When the positioning step is completed, it is necessary to wait until the welding step is completed before the top cover and shell positioning step of the next battery can be carried out, which has low production efficiency.

[0049] By splitting the positioning step and welding step of the top cover and the shell, and performing them at different workstations, the positioning step and the welding step can be performed simultaneously, thereby speeding up the production rhythm and improving production efficiency. Usually, the top cover includes two sides that are opposite to each other. In the welding step, the top cover is held in a snap-fit ​​state after positioning by a clamp for welding. After welding one side, the clamp needs to be loosened, and the battery is turned 180° so that the other side faces the welding head, and then the welding operation of the other side is performed. Since the clamp needs to be loosened, there is a possibility that the positioning of the top cover and the shell will fail, which will have an adverse effect on the welding quality of the other side, resulting in poor reliability of the battery.

[0050] In this regard, it is expected that the welding of the upper and lower sides of the top cover can be completed while the top cover is kept in the buckled state after positioning, that is, the welding of the upper and lower sides of the top cover can be achieved without loosening the clamp. Thus, the upper and lower sides of the top cover are welded respectively by two welding heads arranged above and below, so that there is no need to loosen the clamp and flip the battery, that is, when the upper and lower sides of the top cover are welded, the top cover is kept in the buckled state after positioning, thereby improving the welding quality of each side.

[0051] However, foreign matter such as welding slag generated during the welding process can easily fall onto the laser welding head located below and enter the light outlet, causing the galvanometer to be contaminated and unable to work properly. To address this problem, the risk of foreign matter such as welding slag entering the light outlet is reduced by moving the laser welding head below away from the drop position of foreign matter such as welding slag.

[0052] Based on the above design concept, an embodiment of the present application provides a laser welding device, including: a first welding mechanism, including a first welding head; a second welding mechanism, including a second welding head, and the second welding head is located below the first welding head along the vertical direction; wherein the light outlet of the first welding head is configured to be set downward, and the light outlet of the second welding head is configured to be set obliquely upward and intersecting with the vertical direction.

[0053] By using the first welding head and the second welding head arranged vertically, the upper and lower sides of the top cover can be welded respectively, without the need to loosen the top cover and the shell by the clamp and flip the battery, that is, the upper and lower sides are welded while the top cover and the shell are always in a locked state after being positioned, thereby improving the welding quality and thus improving the battery reliability. In addition, since the light outlet of the second welding head is configured to face the oblique upper direction intersecting the vertical direction, the risk of foreign matter such as fallen welding slag entering the light outlet can be greatly reduced, so that the welding operation can be carried out reliably and stably, thereby improving the welding efficiency.

[0054] The laser welding equipment of the embodiment of the present application can be applied to various links in the production and manufacturing of batteries. Of course, if necessary, it can also be applied to processes where other products need to be welded simultaneously from top to bottom. In the following description, the welding of the top cover and the shell in the battery is used as an example, but the present application is not limited to this.

[0055] Below, refer to Figures 1 to 7 , the laser welding equipment of the embodiment of the present application is described in detail.

[0056] The laser welding equipment 100 of the embodiment of the present application includes: a first welding mechanism 10, including a first welding head 11; a second welding mechanism 20, including a second welding head 21, and the second welding head 21 is located below the first welding head 11 along the vertical direction Z; wherein the light outlet of the first welding head 11 is configured to be set downward, and the light outlet 21a of the second welding head 21 is configured to be set obliquely upward and intersecting the vertical direction Z.

[0057] The first welding head 11 and the second welding head 21 are arranged up and down along the vertical direction Z. The light outlet of the first welding head 11 emits a laser beam toward the bottom, so as to perform a welding operation on the upper part of the workpiece to be welded. The light outlet 21a of the second welding head 21 emits a laser beam toward the top, so as to perform a welding operation on the lower part of the workpiece to be welded. The first welding head 11 and the second welding head 21 can perform the welding operation synchronously or asynchronously, that is, the welding operation of the upper and lower parts is performed successively.

[0058] The light outlet of the first welding head 11 is configured to face downward, and "below" should be broadly understood as directly below or obliquely below. When the first welding head 11 is working, the laser beam emitted from the light outlet of the first welding head 11 is emitted. As an example, the light outlet of the first welding head 11 faces directly downward. The light outlet of the first welding head 11 can be an outlet adjacent to the galvanometer.

[0059] The light outlet 21a of the second welding head 21 is configured to face obliquely upward and intersecting the vertical direction Z, that is, the direction of the light outlet 21a of the second welding head 21 is not directly upward along the vertical direction. When the second welding head 21 is working, the laser beam emitted from the light outlet 21a of the second welding head 21 is emitted. The light outlet 21a of the second welding head 21 can be an outlet adjacent to the galvanometer.

[0060] As an example, the laser beam emitted from the light outlet of the first welding head 11 can perform a welding operation on the top cover of the battery and the upper side of the shell, and the laser beam emitted from the light outlet of the second welding head 21 can perform a welding operation on the top cover and the lower side of the shell. The welding operation can be pre-welding, so that a plurality of welding points are formed on the upper side and the lower side respectively.

[0061] By arranging the first welding head 11 and the second welding head 21 in the vertical direction Z, the upper and lower sides of the top cover and the shell can be welded respectively, so there is no need to loosen the clamp and flip the battery as in the past, that is, the upper and lower sides can be welded in the state where the top cover and the shell are always positioned and fastened, thereby improving the welding quality and thus improving the battery processing reliability. In addition, since the light outlet 21a of the second welding head 21 is arranged in an oblique upward direction, the risk of materials such as welding slag falling into the light outlet can be greatly reduced, so that the welding operation can be carried out reliably and stably.

[0062] In some embodiments, reference Figure 1 and Figure 2 The second welding mechanism 20 includes a first bracket 22 and a first driving mechanism 23. The second welding head 21 is rotatably connected to the first bracket 22 via a rotating shaft 24 extending along a first direction X. The first driving mechanism 23 includes a first driving member, which is connected to the second welding head 21 and is used to drive the second welding head 21 to rotate around the rotating shaft 24. The first direction X is perpendicular to the vertical direction Z.

[0063] The first driving member drives the second welding head 21 to rotate around the rotating shaft 24 to adjust the direction of the light outlet 21a of the second welding head 21, so that the light outlet 21a faces an upward direction and the laser beam emitted from the light outlet 21a can accurately reach the welding position.

[0064] The first driving member may be a servo motor or a servo motor cooperates with a transmission device to realize the rotation of the second welding head 21. The transmission device may be a gear mechanism, a cam mechanism, a screw mechanism, etc.

[0065] By driving the second welding head 21 to rotate around the rotating shaft 24 through the first driving member, the working direction of the light outlet 21a of the second welding head 21 can be conveniently adjusted, so that the light outlet 21a of the second welding head 21 is set in an upward oblique direction, thereby reducing the risk of materials such as welding slag falling into the light outlet, and can also adapt to different types of workpieces to be welded, thereby improving the adaptability.

[0066] In some embodiments, the second welding head 21 can be driven to rotate manually, so as to adjust the direction of the light outlet 21 a of the second welding head 21 .

[0067] In some embodiments, reference Figure 1 and Figure 2 The second welding mechanism 20 also includes a second bracket 25 and a second driving mechanism 26. The first bracket 22 is arranged on the second bracket 25. The second driving mechanism 26 includes a second driving member 261 and a first slide rail 262 extending along the second direction Y. The second bracket 25 is slidably connected to the first slide rail 262. The driving end of the second driving member 261 is connected to the second bracket 25, and is used to drive the second bracket 25 to slide along the first slide rail 262. The second direction Y intersects with the first direction X and is perpendicular to the vertical direction Z.

[0068] The second driving member 261 drives the second bracket 25 to slide along the first slide rail 262, so that the first bracket 22 and the second welding head 21 follow the second bracket 25 to slide along the first slide rail 262, so that when the second welding head 21 is needed for welding, the light outlet 21a of the second welding head 21 can reach the welding position; when the second welding head 21 is not needed for welding, the light outlet 21a of the second welding head 21 can be kept away from the welding position, thereby avoiding the position where welding slag falls during welding of the first welding head 11 above, reducing the risk of welding slag falling and entering the light outlet 21a.

[0069] As an example, the second driving member 261 may be a linear motor. Of course, the second driving member 261 may also be other driving mechanisms, such as a servo motor that cooperates with a transmission device to enable the second welding head 21 to slide along the first slide rail 262.

[0070] In some embodiments, reference Figure 1 and Figure 2 Optionally, the second welding mechanism 20 also includes a third driving mechanism, which includes a third driving member and a second slide rail extending along the vertical direction Z, the second slide rail is arranged on the second bracket 25, the first bracket 22 is slidably connected to the second slide rail, and the driving end of the third driving member is connected to the first bracket 22 for driving the first bracket 22 to slide along the second slide rail.

[0071] The third driving member drives the first bracket 22 to slide along the second slide rail, so that the second welding head 21 follows the first bracket 22 to rise and fall in the vertical direction.

[0072] The third driving member may be a linear motor. Of course, the third driving member may also be other driving mechanisms, such as a servo motor that cooperates with a transmission device to realize the lifting and lowering of the second welding head 21.

[0073] The first bracket 22 is driven to slide along the second slide rail by the third driving member, and the second welding head 21 follows the first bracket 22 to rise and fall in the vertical direction, so that the light outlet 21a of the second welding head 21 is close to or away from the workpiece to be welded, thereby adjusting the optimal welding distance of the second welding head 21 to improve the welding quality.

[0074] Of course, the second welding head 21 may also be fixed along the vertical direction Z.

[0075] In some embodiments, the first welding head 11 can be raised and lowered along the vertical direction Z to adjust the optimal welding distance of the first welding head 11, thereby improving the welding quality. Optionally, the first welding head 11 can also move along the second direction Y.

[0076] In some embodiments, the second welding mechanism 20 further includes a protection component 28 , which is disposed at the light outlet 21 a of the second welding head 21 to prevent welding slag from falling into the light outlet 21 a of the second welding head 21 .

[0077] The protection component 28 can prevent the fallen welding slag from entering the light outlet 21a, and can also blow the fallen welding slag away from the light outlet 21a.

[0078] By disposing the protection component 28 at the light outlet 21 a of the second welding head 21 , the risk of welding slag falling into the light outlet 21 a of the second welding head 21 can be further reduced, thereby improving welding reliability.

[0079] In some embodiments, reference Figure 2 , Figure 3 and Figure 4 The protection assembly 28 includes a first protection member 281, which covers the light outlet 21a of the second welding head 21. The first protection member 281 is provided with a light-transmitting portion 281a for allowing laser to pass through.

[0080] The light-transmitting portion 281a provided in the first protective member 281 is used for the laser beam emitted from the light outlet 21a to pass through, thereby completing the welding operation. One or more light-transmitting portions 281a may be provided. The first protective member 281 covers the light outlet 21a of the second welding head 21, thereby shielding the falling welding slag and protecting the components in the light outlet 21a. As an example, the first protective member 281 may be a plate.

[0081] Therefore, the first protective member 281 covers the light outlet 21a of the second welding head 21. The first protective member 281 is provided with a light-transmitting portion 281a for laser to pass through, which can further reduce the risk of welding slag entering the light outlet 21a without affecting the laser welding operation.

[0082] As an example, the light-transmitting portion 281a may be a through hole, and a plurality of through holes may be provided, and the plurality of through holes correspond to the welding positions of the workpieces to be welded. Of course, the number of through holes may also be one, and one through hole corresponds to a plurality of welding positions of the workpieces to be welded.

[0083] The first protective member 281 is provided with a through hole for the laser beam to pass through, thereby reducing the risk of welding slag entering the light outlet 21 a without reducing the intensity of the laser beam.

[0084] As another example, the light-transmitting portion 281 a is a transparent glass plate.

[0085] The first protective member 281 may be a transparent glass plate as a whole, or a transparent glass plate may be provided at a position for the laser beam to pass through.

[0086] By using the transparent glass plate as the light-transmitting portion 281a, the risk of dropped welding slag entering the light outlet 21a can be completely prevented.

[0087] In some embodiments, reference Figure 2 , Figure 3 and Figure 5 The protection assembly 28 further includes a second protection member 282 , and the second protection member 282 is provided with an air blowing port 282 a , and the direction of the air blowing port 282 a is perpendicular to the direction of the light outlet 21 a of the second welding head 21 .

[0088] The number of the blowing port 282a can be one or more.

[0089] As an example, the second protection member 282 may be provided with two rows of blowing ports 282a.

[0090] The second protection member 282 blows the fallen welding slag in a direction away from the light outlet 21 a , thereby effectively protecting the components inside the light outlet 21 a .

[0091] In some embodiments, reference Figure 2 , Figure 3The protective assembly 28 also includes a third protective member 283, which is arranged between the second protective member 282 and the light outlet 21a of the second welding head 21. The third protective member 283 includes a first air inlet 2831, a second air inlet 2832, an annular inner cavity 2833 and an air outlet 2834. The first air inlet 2831, the second air inlet 2832 and the air outlet 2834 are all connected to the annular inner cavity 2833. The first air inlet 2831 and the second air inlet 2832 are respectively located on opposite sides of the annular inner cavity 2833, and the air outlet 2834 corresponds to the light outlet 21a of the second welding head 21.

[0092] The first air inlet 2831 and the second air inlet 2832 are connected to the blowing system respectively. The gas entering the annular inner cavity 2833 from the first air inlet 2831 and the second air inlet 2832 forms an annular airflow, which is blown toward the welding position through the air outlet 2834, thereby forming a so-called annular air knife.

[0093] By forming an annular airflow in the annular inner cavity 2833, the annular airflow is blown toward the welding position through the air outlet 2834, which can effectively remove foreign matter such as rust, dirt, oxides, etc., thereby improving the welding quality.

[0094] In some embodiments, reference Figure 2 , Figure 3 and Figure 6 The laser welding equipment 100 also includes: a dust removal device 30, which is arranged between the first welding head 11 and the second welding head 21; the dust removal device 30 includes a dust suction port 31, a dust suction chamber 32, a first dust return port 33 and a second dust return port 34, the dust suction port 31, the first dust return port 33 and the second dust return port 34 are all connected to the dust suction chamber 32, the first dust return port 33 and the second dust return port 34 are arranged at intervals along the second direction Y, the dust suction port 31 and the first dust return port 33 and the second dust return port 34 are arranged along the first direction X, and the first dust return port 33 and the second dust return port 34 are located on both sides of the dust suction port 31 along the second direction Y, and the first direction X, the second direction Y and the vertical direction Z are perpendicular to each other.

[0095] The dust suction port 31 can be adjacent to the welding position, and the first dust return port 33 and the second dust return port 34 are used to connect to the negative pressure system. The airflow entering the dust suction chamber 32 from the dust suction port 31 forms an annular airflow and is discharged through the first dust return port 33 and the second dust return port 34.

[0096] The dust removal device 30 can timely discharge the fume, dust and other impurities generated during the welding process, thereby improving the welding quality.

[0097] In some embodiments, the laser welding equipment 100 further includes: a welding fixture 40 disposed between the first welding head 11 and the second welding head 21 , and the welding fixture 40 is used to fix the workpiece to be welded.

[0098] The welding jig 40 clamps the workpieces to be welded, thereby holding the workpieces to be welded in a prescribed state.

[0099] The workpiece to be welded is clamped by the welding fixture 40, so as to be kept in a specified state. While the workpiece to be welded is kept in the specified state, the upper and lower parts of the workpiece to be welded are welded by the first welding head 11 and the second welding head 21 respectively, so as to improve the welding quality.

[0100] In some embodiments, the welding fixture 40 includes: a support frame 41, used to support the workpiece to be welded, the workpiece to be welded is a battery E; a first clamping mechanism 42, including a pair of first clamping jaws 421 and a fourth driving member 422, the pair of first clamping jaws 421 are respectively located on opposite sides of the support frame 41 along the first direction X, the fourth driving member 422 is connected to the pair of first clamping jaws 421, and is used to drive the pair of first clamping jaws 421 to move closer to or away from each other along the first direction X, thereby clamping or releasing the shell of the battery E; two second clamping mechanisms 43, respectively located on opposite sides of the support frame 41 along the first direction X, each second clamping mechanism 43 includes a pair of second clamping jaws 431 and a fifth driving member 432, the pair of second clamping jaws 431 are located on opposite sides of the first clamping jaws 421 along the second direction Y, and the fifth driving member 432 is connected to the pair of second clamping jaws 431, and is used to drive the pair of second clamping jaws 431 to move closer to or away from each other, thereby buckling the top cover of the battery E to the shell.

[0101] As an example, in the pre-welding process of the top cover and the upper and lower long sides of the shell, the support frame 41 can support the large surface of the shell, and the fourth driving member 422 drives a pair of first clamps 421 to approach each other to clamp and fix the shell, and the fifth driving member 432 drives a pair of second clamps 431 to approach each other to respectively snap the top covers at both ends of the shell onto the shell. When the top cover and the shell are snapped together, the first welding head 11 and the second welding head 21 are used to respectively perform welding operations on the upper and lower long sides of the top cover and the shell.

[0102] The top cover and the shell are buckled together by the welding fixture 40, and a high-quality pre-welding operation of the top cover and the shell can be quickly completed in the buckled state, thereby improving production efficiency and welding quality.

[0103] Below, refer to Figures 1 to 7 , a specific example of the present application is described.

[0104] An embodiment of the present application provides a laser welding device 100 , including a first welding mechanism 10 , a second welding mechanism 20 and a welding fixture 40 .

[0105] The first welding mechanism 10 includes a first welding head 11, the light outlet of the first welding head 11 is arranged directly below the vertical direction Z, and the top cover of the battery E and the upper long side of the shell are welded. The second welding mechanism 20 includes a second welding head 21, the second welding head 21 is located below the first welding head 11 along the vertical direction Z, the light outlet 21a of the second welding head 21 is arranged obliquely upward and intersecting the vertical direction Z, and the top cover of the battery E and the lower long side of the shell are welded. Specifically, the second welding mechanism 20 includes a first bracket 22, a second bracket 25, a first driving mechanism 23, a second driving mechanism 26 and a third driving mechanism. The second welding head 21 is rotatably connected to the first bracket 22 through a rotating shaft 24 extending along the first direction X. The first driving mechanism 23 is used to drive the second welding head 21 to rotate around the rotating shaft 24, so that the light outlet 21a of the second welding head 21 is arranged obliquely upward. The third driving mechanism includes a third driving member and a second slide rail extending along the vertical direction Z and arranged on the second bracket 25. The first bracket 22 is slidably connected to the second slide rail. The third driving member is used to drive the first bracket 22 to slide along the second slide rail, thereby driving the second welding head 21 to rise and fall along the vertical direction, thereby adjusting the focal length for different types of batteries to achieve the best welding distance. The second driving mechanism 26 includes a second driving member 261 and a first slide rail 262 extending along the second direction Y. The second bracket 25 is slidably connected to the first slide rail 262. The second driving member 261 is used to drive the second bracket 25 to slide along the first slide rail 262, thereby driving the first bracket 22 and the second welding head 21 to move along the second direction Y, thereby reaching or leaving the welding position.

[0106] The second welding mechanism 20 also includes a protective assembly 28 disposed at the light outlet 21a. The protective assembly 28 includes a first protective member 281, a second protective member 282, and a third protective member 283 disposed in sequence. The third protective member 283 is disposed close to the light outlet 21a. The first protective member 281 may be a protective plate covering the light outlet 21a, on which a through hole for the laser to pass through is disposed. The second protective member 282 is provided with a plurality of air outlets 282a, and the gas ejected from the plurality of air outlets 282a forms an air curtain. The third protective member 283 is an annular double air knife, which cleans the welding seam and improves the welding quality. The welding fixture 40 includes a support frame 41, a first clamping mechanism 42 and two second clamping mechanisms 43. The support frame 41 is used to support the workpiece to be welded, and the workpiece to be welded is a battery E. The first clamping mechanism 42 includes a pair of first clamping jaws 421 and a fourth driving member 422. The pair of first clamping jaws 421 are respectively located on opposite sides of the support frame 41 along the first direction X. The fourth driving member 422 is connected to the pair of first clamping jaws 421 and is used to drive the pair of first clamping jaws 421 to move closer to or away from each other along the first direction X, thereby clamping or releasing the shell of the battery E. The two second clamping mechanisms 43 are respectively located on opposite sides of the support frame 41 along the first direction X. Each second clamping mechanism 43 includes a pair of second clamping jaws 431 and a fifth driving member 432. The pair of second clamping jaws 431 are located on opposite sides of the first clamping jaws 421 along the second direction Y. The fifth driving member 432 is connected to the pair of second clamping jaws 431 and is used to drive the pair of second clamping jaws 431 to move closer to or away from each other, thereby buckling the top cover of the battery E to the shell.

[0107] An embodiment of the present application also provides a battery production line, including: the above-mentioned laser welding equipment 100.

[0108] The above-mentioned laser welding equipment 100 can realize welding operations on the upper and lower sides of the top cover and the shell without loosening the welding fixture 40 and flipping the battery E. While improving the welding efficiency, it can also improve the welding quality, thereby improving the reliability of the battery E.

[0109] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A laser welding device, characterized in that: include: A first welding mechanism, comprising a first welding head; A second welding mechanism, comprising a second welding head, wherein the second welding head is located below the first welding head in a vertical direction; The light outlet of the first welding head is configured to be set toward downward, and the light outlet of the second welding head is configured to be set toward an obliquely upward direction intersecting the vertical direction.

2. The laser welding equipment according to claim 1, characterized in that: The second welding mechanism includes a first bracket and a first driving mechanism. The second welding head is rotatably connected to the first bracket via a rotating shaft extending along a first direction. The first driving mechanism includes a first driving member. The first driving member is connected to the second welding head and is used to drive the second welding head to rotate around the rotating shaft. The first direction is perpendicular to the vertical direction.

3. The laser welding equipment according to claim 2, characterized in that: The second welding mechanism also includes a second bracket and a second driving mechanism, the first bracket is arranged on the second bracket, the second driving mechanism includes a second driving member and a first slide rail extending along a second direction, the second bracket is slidably connected to the first slide rail, and the driving end of the second driving member is connected to the second bracket for driving the second bracket to slide along the first slide rail, and the second direction intersects with the first direction and is perpendicular to the vertical direction.

4. The laser welding equipment according to claim 3, characterized in that: The second welding mechanism also includes a third driving mechanism, which includes a third driving member and a second slide rail extending along the vertical direction, the second slide rail is arranged on the second bracket, the first bracket is slidably connected to the second slide rail, and the driving end of the third driving member is connected to the first bracket for driving the first bracket to slide along the second slide rail.

5. The laser welding equipment according to any one of claims 1 to 4, characterized in that: The second welding mechanism also includes a protection component, which is arranged at the light outlet of the second welding head and is used to prevent welding slag from falling into the light outlet of the second welding head.

6. The laser welding equipment according to claim 5, characterized in that: The protection assembly includes a first protection member, the first protection member covers the light outlet of the second welding head, and the first protection member is provided with a light-transmitting portion for allowing laser to pass through.

7. The laser welding equipment according to claim 6, characterized in that: The light-transmitting portion is a through hole; or, the light-transmitting portion is transparent glass.

8. The laser welding equipment according to claim 6, characterized in that: The protection assembly further includes a second protection member, the second protection member is provided with an air blowing port, and the direction of the air blowing port is perpendicular to the direction of the light outlet of the second welding head.

9. The laser welding equipment according to claim 8, characterized in that: The protective assembly also includes a third protective member, which is arranged between the second protective member and the light outlet of the second welding head. The third protective member includes a first air inlet, a second air inlet, an annular inner cavity and an air outlet. The first air inlet, the second air inlet and the air outlet are all connected to the annular inner cavity. The first air inlet and the second air inlet are respectively located on opposite sides of the annular inner cavity, and the air outlet corresponds to the light outlet of the second welding head.

10. The laser welding equipment according to any one of claims 1 to 4, characterized in that: The laser welding equipment further includes: a dust removal device, the dust removal device being arranged between the first welding head and the second welding head; The dust removal device includes a dust suction port, a dust suction chamber, a first dust return port and a second dust return port, the dust suction port, the first dust return port and the second dust return port are all connected to the dust suction chamber, the first dust return port and the second dust return port are spaced apart along the second direction, the dust suction port and the first dust return port and the second dust return port are arranged along the first direction, and the first dust return port and the second dust return port are located on both sides of the dust suction port along the second direction, and the first direction, the second direction and the vertical direction are perpendicular to each other.

11. The laser welding equipment according to any one of claims 1 to 4, characterized in that: The light outlet of the first welding head faces directly downward in the vertical direction.

12. The laser welding equipment according to any one of claims 1 to 4, characterized in that: The laser welding equipment also includes: A welding fixture, disposed between the first welding head and the second welding head, for fixing the workpiece to be welded; Wherein, in a state where the welding fixture clamps the workpiece to be welded, the first welding head and the second welding head respectively perform welding operations on the upper and lower welding positions of the workpiece to be welded.

13. The laser welding equipment according to claim 12, characterized in that: The welding fixture comprises: A support frame, used for supporting the workpiece to be welded, wherein the workpiece to be welded is a battery; A first clamping mechanism, comprising a pair of first clamping jaws and a fourth driving member, wherein the pair of first clamping jaws are respectively located at opposite sides of the support frame along a first direction, and the fourth driving member is connected to the pair of first clamping jaws and is used to drive the pair of first clamping jaws to move closer to or away from each other along the first direction, thereby clamping or releasing the battery housing; Two second clamping mechanisms are respectively located on opposite sides of the support frame along the first direction, each of the second clamping mechanisms includes a pair of second clamping jaws and a fifth driving member, the pair of second clamping jaws are located on opposite sides of the first clamping jaw along the second direction, and the fifth driving member is connected to the pair of second clamping jaws and is used to drive the pair of second clamping jaws to move closer to or away from each other, thereby buckling the top cover of the battery onto the shell.

14. A battery production line, characterized in that: include: The laser welding device according to any one of claims 1 to 13.

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