Laser welding device and laser welding system

Abstract

The utility model relates to a laser welding device and a laser welding system, the laser welding device comprises a laser emission source, the laser emission source is connected with a plurality of emitting mechanisms, laser emitted by the laser emission source passes through the emitting mechanisms to form a plurality of laser beams, and the laser beams form a welding area surrounding a product to be welded. The laser beams in the circumferential welding area can be used for welding the periphery of the end cover to be welded and the periphery of the mylar film to be welded, relative rotation between a laser device and a product (the end cover and the mylar film) to be welded is not needed, laser welding of the end cover and the mylar film can be achieved at a time, and the welding efficiency of the end cover and the mylar film is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a laser welding device and a laser welding system. Background Art

[0002] A battery includes components such as a battery cell and a Mylar film (i.e., a Mylar film). Among them, the Mylar film is wrapped on the surface of the battery cell. As an insulating material, the Mylar film can protect the positive and negative electrode materials inside the battery cell and prevent problems such as short circuit and leakage of the battery, improving the safety performance of the battery.

[0003] During the manufacturing process of the battery, end caps are provided at both ends of the battery cell, and the Mylar film needs to be welded to the end caps. Currently, hot melt welding or laser welding is used in the industry. Among them, laser welding has higher welding quality and lower cost compared to hot melt welding. Therefore, laser welding has been widely used in the welding field of end caps and Mylar films. However, current laser welding requires relative rotation between the laser and the product to be welded (end cap and Mylar film), which greatly reduces the welding efficiency of the end cap and the Mylar film. Summary of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a laser welding device and a laser welding system, which can improve the laser welding efficiency.

[0005] On the one hand, the utility model provides a laser welding device, including a laser emission source, and a plurality of emission mechanisms are connected to the laser emission source. The laser emitted by the laser emission source forms a plurality of laser beams through the plurality of emission mechanisms, and the plurality of laser beams form a welding area around the product to be welded.

[0006] In an embodiment of the utility model, the plurality of laser beams in the welding area perform synchronous welding on the product to be welded.

[0007] In an embodiment of the utility model, it further includes a beam splitting mechanism and a conduction mechanism. The beam splitting mechanism splits the laser emitted by the laser emission source to form a plurality of laser branches, and the conduction mechanism transmits the laser of the plurality of laser branches to the corresponding emission mechanisms.

[0008] In an embodiment of the utility model, a plurality of laser transmission paths are provided on the conduction mechanism, and the plurality of emission mechanisms are arranged on the conduction mechanism. One end of the laser transmission path is communicated with the corresponding laser branch, and the other end of the laser transmission path transmits the laser of the laser branch to the corresponding emission mechanism.

[0009] In an embodiment of the present utility model, the laser transmission path includes a collimating mechanism, the collimating mechanism is disposed between the corresponding laser branch and the emitting mechanism, and the collimating mechanism is configured to collimate the laser of the laser branch into a parallel light beam.

[0010] In an embodiment of the present utility model, the emitting mechanism includes a shaping portion, along the laser transmission direction, the shaping portion is located downstream of the collimating mechanism, and the shaping portion is configured to shape the parallel light beam into a laser beam having a preset shape and size.

[0011] In an embodiment of the present utility model, at least two parallel light beams passing through the collimating mechanism are coupled to form a coupled light beam, and the coupled light beam passes through the corresponding shaping portion to form a laser beam having a preset shape and size.

[0012] In an embodiment of the present utility model, the conduction mechanism includes a first conduction mechanism and a second conduction mechanism, the first conduction mechanism and the second conduction mechanism are butt-jointed to form a receiving cavity, and the welding area is located in the receiving cavity.

[0013] In an embodiment of the present utility model, a slide rail is further included, the first conduction mechanism and / or the second conduction mechanism is slidably disposed on the slide rail, the direction in which the first conduction mechanism and the second conduction mechanism are butt-jointed is the first direction, and the first conduction mechanism and the second conduction mechanism are butt-jointed or separated along the first direction on the slide rail.

[0014] In an embodiment of the present utility model, adjacent two of the emitting mechanisms are arranged at intervals around the receiving cavity according to a preset distance and / or a preset angle.

[0015] In an embodiment of the present utility model, a plurality of clamping portions are provided on the conduction mechanism, the emitting mechanism includes a positioning portion for positioning the product to be welded, the positioning portion is detachably disposed on the corresponding clamping portion, and the plurality of laser beams pass through the corresponding positioning portion to form the welding area.

[0016] In an embodiment of the present utility model, an elastic mechanism is further provided on the conduction mechanism, the direction of the laser beam along the emitting direction of the emitting mechanism is the second direction, the positioning portion is slidably disposed on the clamping portion in the front-back direction along the second direction, one end of the elastic mechanism abuts against the clamping portion, the other end of the elastic mechanism abuts against the positioning portion, and the elastic force generated by the elastic mechanism is along the second direction.

[0017] In an embodiment of the present utility model, the direction of the laser beam along the emitting direction of the emitting mechanism is the second direction, the direction perpendicular to the second direction is the third direction, and the emitting mechanism can be moved to different positions along the third direction.

[0018] On the other hand, a laser welding system is provided, including the above-mentioned laser welding device. The laser welding system includes a control module, and the control module is used to control the laser emission source to emit laser for laser welding.

[0019] The above technical solution of the present utility model has the following advantages compared with the prior art:

[0020] The multiple laser beams formed by the multiple emission mechanisms of the present utility model form a welding area around the product to be welded (end cap and mylar film). The multiple laser beams within the welding area can weld the peripheries of the end cap and mylar film to be welded, without the need for relative rotation between the laser and the product to be welded (end cap and mylar film), and the laser welding of the end cap and mylar film can be achieved at one time, effectively improving the welding efficiency of the end cap and mylar film; in addition, the laser welding power is high, the heat fusion time is short, the welding time used is short, and the weld size and welding area are accurately controllable; it also effectively reduces the cost. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0022] Figure 1 is a schematic structural diagram of the laser welding device of the present utility model (without installing the end cap and mylar film);

[0023] Figure 2 is a schematic structural diagram of the laser welding device of the present utility model (installing the end cap and mylar film and setting the slide rail);

[0024] Figure 3 is a schematic structural diagram of the conduction mechanism of the laser welding device of the present utility model;

[0025] Figure 4 is a schematic structural diagram of the preset distance and preset angle of the laser welding device of the present utility model;

[0026] Figure 5 is a schematic structural diagram of the laser transmission path of the laser welding device of the present utility model;

[0027] Figure 6 is a cross-sectional view of the laser transmission path of the laser welding device of the present utility model;

[0028] Figure 7 is a schematic structural diagram of the beam coupling of the laser welding device of the present utility model;

[0029] Figure 8 It is a schematic cross-sectional structure diagram of the shaping part of an embodiment of the laser welding device of the present utility model;

[0030] Figure 9 It is a schematic cross-sectional structure diagram of the shaping part of an embodiment of the laser welding device of the present utility model;

[0031] Figure 10 It is a schematic cross-sectional structure diagram of the shaping part of an embodiment of the laser welding device of the present utility model;

[0032] Figure 11 It is a schematic cross-sectional structure diagram of the shaping part of an embodiment of the laser welding device of the present utility model.

[0033] Explanation of reference numerals in the specification drawings:

[0034] 1. Laser emission source; 2. Emission mechanism; 3. Welding area; 4. Beam splitting mechanism; 5. Conduction mechanism; 6. Laser transmission path; 7. Collimation mechanism; 8. Shaping part; 9. First conduction mechanism; 10. Second conduction mechanism; 11. Accommodation cavity; 12. Slide rail; 13. Clamping part; 14. Positioning part; 15. Elastic mechanism; 16. Laser transmission cable; 17. Laser outlet; 18. Fixed seat; 19. Mounting seat; 20. Sliding installation groove; 21. Mylar film; 22. End cover. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] Embodiment 1

[0037] Referring to Figures 1 to 11 As shown, the laser welding device of the present utility model includes a laser emission source 1, and a plurality of emission mechanisms 2 are connected to the laser emission source 1. The laser emitted by the laser emission source 1 forms a plurality of laser beams through the plurality of emission mechanisms 2, and the plurality of laser beams form a welding area 3 around the product to be welded.

[0038] The battery includes a battery cell, two end caps 22 and a Mylar film 21. The two end caps 22 are respectively located at the two ends of the battery cell. The Mylar film 21 is coated on the sides of the battery cell and the end caps 22. During the manufacturing process of the battery, the Mylar film 21 needs to be welded to the end caps 22. Therefore, the present application proposes a laser welding device to laser weld the end caps 22 and the Mylar film 21. Specifically, the laser welding device of the present application includes a laser emission source 1. The laser emission source 1 adopts a semiconductor laser. The semiconductor laser is used to weld the end caps 22 and the Mylar film 21. The phenomenon of adhesion and wire drawing will not occur, and frequent maintenance is not required (when the prior art uses a hot melt head for welding, it often needs to be replaced due to adhesion and wire drawing), which is conducive to achieving high-quality welding of the film. Furthermore, a plurality of emission mechanisms 2 are connected to the laser emission source 1, such as Figure 1 and Figure 3 As shown, the laser emitted by the laser emission source 1 passes through a plurality of emission mechanisms 2 to form a plurality of laser beams, that is, each emission mechanism 2 forms a laser beam, and the plurality of laser beams formed by the plurality of emission mechanisms 2 surround the product to be welded (end cap 22 and Mylar film 21) to form a welding area 3, which is a circumferential welding area. The plurality of laser beams in the circumferential welding area can weld the end cap 22 to be welded and the Mylar film 21 to be welded in the circumferential welding area. There is no need for relative rotation between the laser and the product to be welded (end cap 22 and Mylar film 21), which effectively improves the welding efficiency of the end cap 22 and the Mylar film 21. In addition, the laser welding power is high, the hot melting time is short, the welding time is short, and the weld size and welding area are precisely controllable. Among them, the Mylar film 21 and the end cap 22 are both made of polyethylene material, which is a thermoplastic material, the light transmittance of the Mylar film 21 is greater than 20%, and the end cap 22 is a black non-translucent material, which meets the welding conditions and is convenient for laser welding.

[0039] In one embodiment, several laser beams in the welding area 3 perform synchronous welding.

[0040] like Figure 1 As shown, the welding area 3 is a circumferential welding area. Multiple laser beams in the circumferential welding area can synchronously weld the four sides of the end cap 22 and the Mylar film 21 to be welded. The laser welding of the end cap 22 and the Mylar film 21 can be achieved at one time, further improving the welding efficiency of the laser welding of the end cap 22 and the Mylar film 21.

[0041] In one embodiment, it further includes a splitting mechanism 4 and a transmission mechanism 5 , wherein the splitting mechanism 4 splits the laser emitted by the laser emission source 1 to form a plurality of laser branches, and the transmission mechanism 5 transmits the lasers of the plurality of laser branches to the corresponding output mechanism 2 .

[0042] like Figure 1As shown in the figure, the laser welding device further includes a beam splitting mechanism 4 and a conduction mechanism 5. Specifically, the laser emitted by the laser emission source 1 is first transmitted to the beam splitting mechanism 4. The beam splitting mechanism 4 splits the laser emitted by the laser emission source 1 to form several laser branches. The laser of each laser branch can be used for laser welding to achieve circumferential welding. Further, an emission mechanism 2 is provided on the conduction mechanism 5. The conduction mechanism 5 is used to transmit the laser of each laser branch to the corresponding emission mechanism 2. The several laser beams passing through the emission mechanism 2 form a welding area 3, so as to simultaneously perform circumferential welding on the end cap 22 and the mylar film 21 to be welded through a plurality of emission mechanisms 2.

[0043] In one embodiment, several laser transmission paths 6 are further provided on the conduction mechanism 5. The several emission mechanisms 2 are provided on the conduction mechanism 5. One end of the laser transmission path 6 is communicated with the corresponding laser branch, and the other end of the laser transmission path 6 transmits the laser of the laser branch to the corresponding emission mechanism 2.

[0044] Several laser transmission paths 6 are provided on the conduction mechanism 5, as Figure 6 shown, so as to transmit the laser of the laser branch to the corresponding emission mechanism 2, so that the laser passing through the emission mechanism 2 performs circumferential welding on the end cap 22 and the mylar film 21 to be welded. Specifically, several emission mechanisms 2 are provided on the conduction mechanism 5, and the laser transmission paths 6 are provided between the corresponding emission mechanisms 2 and the laser branches. That is, one end of the laser transmission path 6 is communicated with the corresponding laser branch to realize the transmission of the laser on the laser branch to the corresponding laser transmission path 6; the other end of the laser transmission path 6 transmits the laser of the laser branch to the corresponding emission mechanism 2, so as to perform circumferential welding on the end cap 22 and the mylar film 21 to be welded by the laser passing through the emission mechanism 2. Further, the laser of the laser branch is transmitted through a laser transmission cable 16 (optical fiber), as Figure 1 shown. The laser transmission cable 16 is arranged between the beam splitting mechanism 4 and the conduction mechanism 5. Several laser outlets 17 are provided on the beam splitting mechanism 4. In addition, a fixing seat 18 is provided on the conduction mechanism 5, as Figure 3 shown. The fixing seat 18 is used to fix the laser transmission cable 16. Therefore, one end of the laser transmission cable 16 is communicated with the corresponding laser outlet 17 on the beam splitting mechanism 4 to realize the transmission of the laser of several laser branches of the beam splitting mechanism 4 to the corresponding laser transmission cable 16; the other end of the laser transmission cable 16 is fixed on the corresponding fixing seat 18 and is communicated with the corresponding laser transmission path 6, so as to transmit the laser on each laser transmission cable 16 to the laser transmission path 6 on the conduction mechanism 5.

[0045] In one of the embodiments, the laser transmission path 6 includes a collimating mechanism 7. The collimating mechanism 7 is disposed between the corresponding laser branch and the emitting mechanism 2, and the collimating mechanism 7 is configured to collimate the laser of the laser branch into a parallel light beam.

[0046] As Figure 6 shown, the laser transmission path 6 includes a collimating mechanism 7. The collimating mechanism 7 is configured to collimate the laser of the laser transmission cable 16 into a parallel light beam. Specifically, the collimating mechanism 7 employs a collimating mirror. The laser on the laser branch is divergently transmitted to the collimating mirror, and the collimating mirror collimates the divergent laser of the laser branch into a parallel light beam, as Figure 6 shown.

[0047] In one of the embodiments, the emitting mechanism 2 includes a shaping portion 8. Along the laser transmission direction, the shaping portion 8 is located downstream of the collimating mechanism 7, and the shaping portion 8 is configured to shape the parallel light beam into a laser beam having a preset shape and size.

[0048] The laser passing through the emitting mechanism 2 is used to weld the end cap 22 and the mylar film 21 to be welded. The cross-section of the parallel light beam passing through the collimating mirror is circular, and the parallel light beam needs to be shaped into a required light beam. The required light beam has different shapes, such as circular, strip-shaped or special-shaped. Therefore, the emitting mechanism 2 includes a shaping portion 8, as Figure 5 and Figure 6 shown. The spot shape of the laser beam passing through the shaping portion 8 is circular, strip-shaped or special-shaped, as Figure 8 、 Figure 9 、 Figure 10 and Figure 11As shown. Preferably, a bar pattern is selected in this application. After the laser of a laser branch passes through a collimating mirror of a corresponding specification, a parallel beam with a diameter of a corresponding specification can be formed. For example, collimating mirrors of different specifications can form parallel beams with diameters of 8 mm, 10 mm, 12 mm, etc. The parallel beams with diameters of 8 mm, 10 mm, and 12 mm can all be shaped into bar (preset shape) light spots with a size of 1 mm * 5 mm (preset size) after passing through the shaping part 8. The parallel beam with a diameter of 10 mm can be shaped into a bar light spot with a size of 1 mm * 8 mm after passing through the shaping part 8. The parallel beam with a diameter of 12 mm can be shaped into a bar light spot with a size of 1 mm * 10 mm after passing through the shaping part 8. Among them, the shaping part 8 of the light-emitting mechanism 2 can be replaced according to actual needs to meet the requirements of different light spot shapes. The shaping part 8 is a light homogenizing sheet or a diffusing sheet. When the shaping part 8 is a light homogenizing sheet, the parallel beam remains a parallel beam after passing through the light homogenizing sheet; when the shaping part 8 is a diffusing sheet, the parallel beam becomes a divergent beam after passing through the diffusing sheet. At this time, the size of the light spot passing through the shaping part 8 will increase as the distance from the diffusing sheet increases. Therefore, a larger light spot can be generated when using a diffusing sheet, which is specifically configured according to actual needs. When the shaping part 8 is a light homogenizing sheet, the focal length is the first distance. When the distance between the product to be welded and the diffusing sheet is greater than the first distance, the power of the semiconductor laser needs to be increased accordingly to increase the energy density of the light spot and achieve effective welding. When the distance between the product to be welded and the diffusing sheet is less than the first distance, the power of the semiconductor laser needs to be decreased accordingly to reduce the energy density of the light spot and achieve effective welding. When the shaping part 8 is a diffusing sheet, the size of the light spot is the first light spot size. When it is necessary to increase the first light spot size, the distance between the product to be welded and the diffusing sheet needs to be increased. At this time, the power of the semiconductor laser needs to be increased to increase the energy density of the light spot and achieve effective welding; when it is necessary to decrease the first light spot size, the distance between the product to be welded and the diffusing sheet needs to be decreased. At this time, the power of the semiconductor laser needs to be decreased to reduce the energy density of the light spot and achieve effective welding. Therefore, the laser power needs to be adjusted according to actual needs, and the semiconductor laser can be set with a corresponding power margin to meet the requirements of laser welding with various powers. For example, when laser welding the mylar film 21 and the end cap 22, the required power is 18 W, the number of laser branches and the light-emitting mechanism 2 is ten each, then the power of the semiconductor laser is 500 W, and the laser power of each light-emitting mechanism 2 is 50 W. 50 W can provide a power margin for the required 18 W power. When it is necessary to adjust the energy density of the light spot according to actual needs, 50 W can cover the required power sizes for welding different specifications of mylar films 21 and end caps 22. Among them, along the laser transmission direction, the shaping part 8 is located downstream of the collimating mechanism 7 and between the collimating mechanism 7 and the positioning part 14, such as Figure 5 and Figure 6 as shown.

[0049] In one of the embodiments, at least two parallel light beams passing through the collimating mechanism 7 are coupled to form a coupled light beam, and the coupled light beam passes through the corresponding shaping unit 8 to form a laser beam with a preset shape and size.

[0050] The lasers of at least two laser branches can perform beam coupling on the conduction mechanism 5 to configure a light spot with a corresponding size according to the actual situation. Specifically, the coupled light beam passes through the corresponding shaping unit 8 to form a laser beam with a preset shape and size. For example, the lasers of two laser branches can both form parallel light beams with a diameter of 8 mm after passing through the corresponding collimating mirrors. A parallel light beam with a diameter of 8 mm can be shaped into a light spot with a size of 1 mm * 5 mm after passing through the shaping unit 8. After the two parallel light beams with a diameter of 8 mm perform beam coupling and then pass through the shaping unit 8, they can be superposed and shaped into a strip-shaped light spot (preset shape) with a size of 1 mm * 10 mm (preset size). The coupling schematic is as Figure 7 shown. Therefore, it can be configured according to the actual scenario. If a light spot with a size of 1 mm * 15 mm is required, then the three parallel light beams with a diameter of 8 mm perform beam coupling and then pass through the shaping unit 8, and they can be superposed and shaped into a strip-shaped light spot with a size of 1 mm * 15 mm.

[0051] In one of the embodiments, the conduction mechanism 5 includes a first conduction mechanism 9 and a second conduction mechanism 10. The first conduction mechanism 9 and the second conduction mechanism 10 are butted to form a receiving cavity 11, and the welding area 3 is located in the receiving cavity 11.

[0052] As Figure 3As shown in the figure, the conduction mechanism 5 includes a first conduction mechanism 9 and a second conduction mechanism 10. Both the first conduction mechanism 9 and the second conduction mechanism 10 have a semi-accommodation cavity. After the first conduction mechanism 9 and the second conduction mechanism 10 are docked, the two semi-accommodation cavities form a complete accommodation cavity 11. The accommodation cavity 11 is preferably rectangular and is adapted to the shape of the end cap 22. In specific use, first, the end cap 22 to be welded and the end of the mylar film 21 are placed in the semi-accommodation cavity of the first conduction mechanism 9. Then, the second conduction mechanism 10 is moved and docked with the first conduction mechanism 9. The end cap 22 to be welded and the end of the mylar film 21 are exactly located in the complete accommodation cavity 11, and the welding area 3 is located in the accommodation cavity 11, which is convenient for laser welding of the welding area 3. Or first, the end cap 22 to be welded and the end of the mylar film 21 are placed in the semi-accommodation cavity of the second conduction mechanism 10. Then, the first conduction mechanism 9 is moved and docked with the second conduction mechanism 10. The end cap 22 to be welded and the end of the mylar film 21 are exactly located in the complete accommodation cavity 11, and the welding area 3 is located in the accommodation cavity 11, which is convenient for laser welding of the welding area 3. Or first, the end cap 22 to be welded and the end of the mylar film 21 are placed in the middle position between the two semi-accommodation cavities. Then, the first conduction mechanism 9 and the second conduction mechanism 10 are moved simultaneously, and the first conduction mechanism 9 and the second conduction mechanism 10 are docked synchronously, so that the end cap 22 to be welded and the end of the mylar film 21 are exactly located in the complete accommodation cavity 11, and the welding area 3 is located in the accommodation cavity 11, which is convenient for laser welding of the welding area 3. In addition, the first conduction mechanism 9 and the second conduction mechanism 10 can share a laser emission source 1. For example, a laser emission source 1 forms twenty laser branches through a beam splitting mechanism 4. Any two laser branches are coupled into a coupled beam, a total of ten coupled beams, corresponding to ten emission mechanisms 2. Each long side of the end cap 22 corresponds to four emission mechanisms 2, and each short side of the end cap 22 corresponds to one emission mechanism 2. There are a total of ten weld marks on the end cap 22 and the mylar film 21 after welding. Or, the first conduction mechanism 9 is equipped with a laser emission source 1, and the second conduction mechanism 10 is equipped with a laser emission source 1, a total of two laser emission sources 1. Each laser emission source 1 forms ten laser branches, and the two laser emission sources 1 form a total of twenty laser branches. Any two laser branches are coupled into a coupled beam, a total of ten coupled beams, corresponding to ten emission mechanisms 2. Each long side of the end cap 22 corresponds to four emission mechanisms 2, and each short side of the end cap 22 corresponds to one emission mechanism 2. There are a total of ten weld marks on the end cap 22 and the mylar film 21 after welding. The specific number of the laser emission source 1, the laser branches, and the emission mechanisms 2 is configured according to actual requirements. Compared with the cost of four sets of hot melt equipment, the cost of one or two sets of lasers is lower, effectively reducing the welding cost.

[0053] In one of the embodiments, a slide rail 12 is further included. The first conduction mechanism 9 and / or the second conduction mechanism 10 are slidably disposed on the slide rail 12. The direction in which the first conduction mechanism 9 and the second conduction mechanism 10 are butted is the first direction, and the first conduction mechanism 9 and the second conduction mechanism 10 are butted or separated along the first direction on the slide rail 12.

[0054] Specifically, the first conduction mechanism 9 is slidably disposed on the guide rail, and the second conduction mechanism 10 is fixed. The butting and separation with the second conduction mechanism 10 are realized by the sliding movement of the first conduction mechanism 9 on the slide rail 12; or the second conduction mechanism 10 is slidably disposed on the guide rail, and the first conduction mechanism 9 is fixed. The butting and separation with the first conduction mechanism 9 are realized by the sliding movement of the second conduction mechanism 10 on the slide rail 12; or both the first conduction mechanism 9 and the second conduction mechanism 10 are slidably disposed on the guide rail, and the first conduction mechanism 9 and the second conduction mechanism 10 are butted and separated simultaneously on the slide rail 12. By means of the slide rail 12, the butting accuracy between the first conduction mechanism 9 and the second conduction mechanism 10 can be improved. In addition, the sliding power of the first conduction mechanism 9 and the second conduction mechanism 10 can be realized by a cylinder to improve the welding efficiency. The direction in which the first conduction mechanism 9 and the second conduction mechanism 10 are butted is the first direction. For example, Figure 2 as shown in the X direction or the negative X direction, then the sliding directions of the first conduction mechanism 9 and the second conduction mechanism 10 on the slide rail 12 are butted or separated along the first direction.

[0055] In one of the embodiments, two adjacent emission mechanisms 2 are arranged at intervals around the accommodation cavity 11 according to a preset distance and / or a preset angle.

[0056] For example, Figure 4 as shown, a plurality of emission mechanisms 2 are arranged around the end cap 22 and the mylar film 21 to realize circumferential welding of the end cap 22 and the mylar film 21. Specifically, the number of weld marks after welding and the distance between two adjacent weld marks are designed according to actual requirements, that is, the preset distance D between two adjacent emission mechanisms 2 is designed according to actual requirements. For example, Figure 4 as shown, since the transmission direction of the laser beam passing through the emission mechanism 2 is perpendicular to the welding surface, the preset distance between two adjacent emission mechanisms 2 determines the distance between two adjacent weld marks. In addition, the angle α between two adjacent emission mechanisms 2 can also be designed according to actual conditions. For example, Figure 4 as shown, two adjacent emission mechanisms 2 corresponding to the long side of the end cap are arranged according to a preset distance, and the emission mechanism 2 on the long side of the end cap and the emission mechanism on the short side of the end cap are arranged according to a preset angle.

[0057] In one of the embodiments, a plurality of clamping portions 13 are provided on the conduction mechanism 5. The emission mechanism 2 includes a positioning portion 14 for positioning the product to be welded. The positioning portion 14 is detachably provided on the corresponding clamping portion 13. A plurality of laser beams pass through the corresponding positioning portion 14 to form the welding area 3.

[0058] As Figure 5 and Figure 6 shown, the emission mechanism 2 includes a positioning portion 14. The positioning portion 14 is detachably provided on the conduction mechanism 5. The positioning portion 14 is used for abutting and positioning the end cap 22 and the mylar film 21 to be welded. Among them, the positioning portion 14 is made of a transparent material to form a transparent positioning portion, which is convenient for the transmission of laser. Specifically, a plurality of clamping portions 13 are provided on the conduction mechanism 5. Each positioning portion 14 can be detachably installed on the corresponding clamping portion 13. When laser welding is performed, after the first conduction mechanism 9 is docked with the second conduction mechanism 10, the end cap 22 and the mylar film 21 are abutted and positioned through the positioning portion 14, that is, the positioning portion 14 presses the mylar film 21 so that the mylar film 21 abuts on the surface of the end cap 22, which is convenient for the laser beam passing through the emission mechanism 2 to pass through the positioning portion 14 to perform laser welding on the end cap 22 and the mylar film 21. Among them, the maintenance cost of laser welding is low, and it only needs to clean the positioning portion 14 every two hours. Compared with the hot melting equipment with adhesion and wire drawing, the maintenance cost is reduced. In addition, since the positioning portion 14 is detachably provided on the conduction mechanism 5, the position of the positioning portion 14 on the conduction mechanism 5 can be adjusted to have different working positions, and this working position corresponds to the position of the corresponding emission mechanism 2, and the welding mark positions on the end cap 22 and the mylar film 21 after laser welding can be adjusted.

[0059] In one of the embodiments, an elastic mechanism 15 is further provided on the conduction mechanism 5. The emission direction of the laser beam along the emission mechanism 2 is the second direction. The positioning portion 14 is slidably provided on the clamping portion 13 in the front-back direction along the second direction. One end of the elastic mechanism 15 abuts on the clamping portion 13, and the other end of the elastic mechanism 15 abuts on the positioning portion 14. The elastic force generated by the elastic mechanism 15 is along the second direction.

[0060] As Figure 5 and Figure 6As shown, an elastic mechanism 15 is further provided on the conduction mechanism 5. Through the elastic mechanism 15, the positioning portion 14 contacts and presses the mylar film 21. Specifically, the direction of the laser beam along the emission mechanism 2 is the second direction. The elastic mechanism 15 uses a compression spring, and the axis of the compression spring is arranged parallel to the second direction. Preferably, the axis of the compression spring coincides with the axis of the laser beam. One end of the compression spring abuts against the clamping portion 13, and the other end of the compression spring is connected to the positioning portion 14. Therefore, the elastic force generated by the spring gives the positioning portion 14 a force along the second direction. When the first conduction mechanism 9 is docked with the second conduction mechanism 10, the positioning portion 14 first contacts the mylar film 21, causing the mylar film 21 to abut against the surface of the end cap 22. As the first conduction mechanism 9 and the second conduction mechanism 10 are further docked, the positioning portion 14 moves in the opposite direction of the second direction relative to the corresponding conduction mechanism, causing the compression spring to compress. The elastic force generated by the compression spring is transmitted to the mylar film 21 through the positioning portion 14, and the abutting and positioning of the end cap 22 and the mylar film 21 can be realized. The direct positioning method through the positioning portion 14 is a hard contact. Due to manufacturing errors, there is a possibility that some positioning portions 14 have a large abutting force on the mylar film 21, while some positioning portions 14 do not contact the mylar film 21. Therefore, directly using the hard contact positioning of the positioning portion 14 easily damages the mylar film 21. This kind of extrusion positioning using a spring enables each positioning portion 14 to effectively contact and position the corresponding mylar film 21, and the extrusion pressure is relatively average, which not only improves the positioning accuracy but also further improves the welding quality.

[0061] In one of the embodiments, the direction of the laser beam along the emission mechanism 2 is the second direction, and the direction perpendicular to the second direction is the third direction. The emission mechanism 2 can move to different positions along the third direction.

[0062] The direction of the laser beam along the emission mechanism 2 is the second direction, and the direction perpendicular to the second direction is the third direction. Since the emission mechanism 2 can move to different positions along the third direction, all the third directions are in the same vertical plane, and the emission mechanism 2 at different positions has different positions relative to the mylar film 21 and the end cap 22. Therefore, the positions of the weld marks formed after the emission mechanism 2 performs laser welding on the mylar film 21 and the end cap 22 are different, such as Figure 8 and Figure 9The shown solder mark positions can all be achieved. Further, the laser transmission cable 16 is used to transmit the laser of the laser branch. One end of the laser transmission cable 16 close to the conduction mechanism 5 is fixed on the conduction mechanism 5 through a fixing seat 18. Therefore, as shown in the figure, the corresponding fixing seat 18, collimating mechanism 7, and emitting mechanism 2 (shaping part 8 and positioning part 14) of the same laser transmission path 6 can be installed on the mounting seat 19 as a whole. When the mounting seat 19 is moved, the fixing seat 18, collimating mechanism 7, and emitting mechanism 2 (shaping part 8 and positioning part 14) can be moved synchronously as a whole, which can not only ensure the normal transmission of the laser but also enable the emitting mechanism 2 to have different positions. Therefore, the solder mark positions generated when the emitting mechanism 2 performs welding on the end cap 22 and the mylar film 21 can be adjusted. Further, as Figure 3 shown, a sliding mounting groove 20 is provided on the conduction mechanism 5, and the mounting seat 19 is slidably mounted in the mounting sliding groove 20. The sliding direction of the mounting seat 19 in the mounting sliding groove 20 is along the Y direction or the negative Y direction.

[0063] Embodiment 2

[0064] A laser welding system is provided, including the above laser welding device. The laser welding system includes a control module, and the control module is used to control the laser emission source 1 to emit laser for laser welding. Among them, for the laser emission source 1 of the laser welding device, a plurality of emitting mechanisms 2 are connected to the laser emission source 1. The laser emitted by the laser emission source 1 forms a plurality of laser beams after passing through the plurality of emitting mechanisms 2, and the plurality of laser beams passing through the emitting mechanisms 2 form a welding area 3.

[0065] The laser welding machine system of the present application includes a control module. The control module controls the laser emission source 1 to emit laser. A plurality of emitting mechanisms 2 are connected to the laser emission source 1. The laser emitted by the laser emission source 1 forms a plurality of laser beams after passing through the plurality of emitting mechanisms 2. That is, each emitting mechanism 2 forms a laser beam, and the plurality of laser beams formed by the plurality of emitting mechanisms 2 form a welding area 3 around the end cap 22 and the mylar film 21 to be welded. The plurality of emitting mechanisms 2 can simultaneously weld the end cap 22 and the mylar film 21 to be welded through the welding area 3. The control module can control parameters such as the laser power and welding time of the laser emission source 1 to make the laser welding device work in an optimal state. The laser processing device of the present application does not need to realize the relative rotation between the laser emission source 1 and the end cap 22 and the mylar film 21, which improves the laser processing efficiency of the laser processing device and further improves the laser processing efficiency of the laser processing system.

[0066] Note that the above is only the preferred embodiment of the present utility model and the applied technical principles. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in more detail through the above embodiments, the present utility model is not limited to the above embodiments only. Without departing from the concept of the present utility model, it may also include more other equivalent embodiments, and the scope of the present utility model is determined by the scope of the appended claims.

Claims

1. A laser welding device, characterized in that: It includes a laser emission source (1), a beam splitting mechanism (4) and a conduction mechanism (5). A plurality of emission mechanisms (2) are connected to the laser emission source (1). The laser emitted by the laser emission source (1) forms a plurality of laser beams through the plurality of emission mechanisms (2), and the plurality of laser beams form a welding area (3) around the product to be welded. The beam splitting mechanism (4) splits the laser emitted by the laser emission source (1) to form a plurality of laser branches, and the conduction mechanism (5) transmits the laser of the plurality of laser branches to the corresponding emission mechanisms (2).

2. The laser welding device according to claim 1, wherein: A plurality of laser transmission paths (6) are provided on the conduction mechanism (5). The plurality of emission mechanisms (2) are provided on the conduction mechanism (5). One end of the laser transmission path (6) is communicated with the corresponding laser branch, and the other end of the laser transmission path (6) transmits the laser of the laser branch to the corresponding emission mechanism (2).

3. The laser welding device according to claim 2, characterized in that: The laser transmission path (6) includes a collimation mechanism (7). The collimation mechanism (7) is provided between the corresponding laser branch and the emission mechanism (2), and the collimation mechanism (7) is used to collimate the laser of the laser branch into a parallel light beam.

4. The laser welding device according to claim 3, wherein: The emission mechanism (2) includes a shaping part (8). Along the laser transmission direction, the shaping part (8) is located downstream of the collimation mechanism (7), and the shaping part (8) is used to shape the parallel light beam into a laser beam with a preset shape and size.

5. The laser welding device according to claim 1, wherein: The conduction mechanism (5) includes a first conduction mechanism (9) and a second conduction mechanism (10). The first conduction mechanism (9) and the second conduction mechanism (10) are butted to form a receiving cavity (11), and the welding area (3) is located in the receiving cavity (11).

6. The laser welding device according to claim 5, characterized in that: It further includes a slide rail (12). The first conduction mechanism (9) and / or the second conduction mechanism (10) is slidably provided on the slide rail (12). The direction in which the first conduction mechanism (9) and the second conduction mechanism (10) are butted is the first direction, and the first conduction mechanism (9) and the second conduction mechanism (10) are butted or separated along the first direction on the slide rail (12).

7. The laser welding device according to claim 1, characterized in that: A plurality of clamping parts (13) are provided on the conduction mechanism (5). The emission mechanism (2) includes a positioning part (14) for positioning the product to be welded. The positioning part (14) is detachably provided on the corresponding clamping part (13), and the plurality of laser beams pass through the corresponding positioning part (14) to form the welding area (3).

8. The laser welding device according to claim 7, characterized in that: An elastic mechanism (15) is further provided on the conduction mechanism (5). The emission direction of the laser beam along the emission mechanism (2) is the second direction. The positioning part (14) is slidably provided on the clamping part (13) in the front-back direction along the second direction. One end of the elastic mechanism (15) abuts against the clamping part (13), and the other end of the elastic mechanism (15) abuts against the positioning part (14). The elastic force generated by the elastic mechanism (15) is along the second direction.

9. A laser welding system, characterized in that: Including the laser welding device according to any one of claims 1-8, the laser welding system includes a control module for controlling the laser emission source (1) to emit laser for laser welding.

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