Laser welding apparatus and laser welding system

Abstract

A laser welding apparatus and a laser welding system. The apparatus comprises a laser emitting source (1), wherein the laser emitting source (1) is connected to emitting mechanisms (2), laser emitted by the laser emitting source (1) passes through the emitting mechanisms (2) to form laser beams, and the laser beams form a welding area (3) surrounding a product to be welded.

Description

Laser welding device and laser welding system

[0001] Cross-reference to related applications

[0002] This application claims priority to and the benefit of Chinese Patent Application No. 202421574622.0, filed July 4, 2024, entitled “Laser welding device and laser welding system,” the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to, but is not limited to, the technical field of battery manufacturing, and particularly refers to a laser welding device and a laser welding system. BACKGROUND

[0004] A battery includes an electric core and a Mylar film and other components. Among them, the Mylar film is wrapped on the surface of the electric core, and the Mylar film, as an insulating material, can protect the positive and negative materials inside the electric core and prevent the battery from short circuiting and leaking, thereby improving the safety performance of the battery.

[0005] In the manufacturing process of the battery, end covers are arranged at both ends of the electric core, and the Mylar film is welded with the end covers. Currently, hot melt welding or laser welding is used in the industry. Among them, the welding quality of laser welding is higher than that of hot melt welding, and the cost is lower. Therefore, laser welding has been widely used in the welding field of end covers and Mylar films. However, the current laser welding relies on the relative rotation between the laser and the product to be welded (end cover and Mylar film), which greatly reduces the welding efficiency of the end cover and the Mylar film. SUMMARY

[0006] In one aspect, the present disclosure provides a laser welding device, comprising a laser emitting source, an emitting mechanism connected to the laser emitting source, a laser beam formed by the laser emitted by the laser emitting source passing through the emitting mechanism, and a welding area formed by the laser beam around a product to be welded.

[0007] In some embodiments, the laser beam in the welding area performs synchronous welding on the product to be welded.

[0008] In some embodiments, the laser welding device further comprises a light splitting mechanism and a conducting mechanism, the light splitting mechanism splits the laser emitted by the laser emitting source to form a laser branch, and the conducting mechanism transmits the laser of the laser branch to the corresponding emitting mechanism.

[0009] In some embodiments, the conducting mechanism is provided with a laser transmission path, the emitting mechanism is arranged on the conducting mechanism, one end of the laser transmission path is connected with the corresponding laser branch, and the other end of the laser transmission path transmits the laser of the laser branch to the corresponding emitting mechanism.

[0010] In some embodiments, the laser transmission path comprises a collimation mechanism arranged between the corresponding laser branch and the exit mechanism, the collimation mechanism being arranged to collimate the laser of the laser branch into a parallel light beam.

[0011] In some embodiments, the exit mechanism comprises a shaping portion, which is located downstream of the collimation mechanism along the laser transmission direction, the shaping portion being arranged to shape the parallel light beam into a laser beam with a preset shape and size.

[0012] In some embodiments, at least two parallel light beams passing through the collimation 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 with a preset shape and size.

[0013] In some embodiments, the transmission mechanism comprises a first transmission mechanism and a second transmission mechanism, the first transmission mechanism and the second transmission mechanism are relatively connected to form a receiving cavity, and the welding area is located in the receiving cavity.

[0014] In some embodiments, a slide rail is further provided, the first transmission mechanism and / or the second transmission mechanism are slidably arranged on the slide rail, the relative connection direction of the first transmission mechanism and the second transmission mechanism is a first direction, and the first transmission mechanism and the second transmission mechanism are relatively connected or separated along the first direction on the slide rail.

[0015] In some embodiments, two adjacent exit mechanisms are arranged at a preset distance and / or a preset angle around the receiving cavity.

[0016] In some embodiments, the transmission mechanism is provided with a clamping portion, the exit mechanism comprises a positioning portion for positioning the product to be welded, the positioning portion is detachably arranged on the corresponding clamping portion, and the laser beam passes through the corresponding positioning portion to form the welding area.

[0017] In some embodiments, the transmission mechanism is further provided with an elastic mechanism, the exit direction of the exit mechanism is a second direction, the positioning portion is slidably arranged on the clamping portion along the front-rear direction of 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.

[0018] In some embodiments, the exit direction of the exit mechanism is a second direction, the direction perpendicular to the second direction is a third direction, and the exit mechanism is movable to different positions along the third direction.

[0019] In another aspect, a laser welding system is provided, comprising the laser welding device as described above, the laser welding system comprising a control module configured to control the laser emitting source to emit laser light for laser welding. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained without creative effort based on these drawings.

[0021] FIG. 1 is a structural schematic diagram of a laser welding device according to an embodiment of the present disclosure (without installing end cover and Mylar film);

[0022] FIG. 2 is a structural schematic diagram of a laser welding device according to an embodiment of the present disclosure (installing end cover and Mylar film and setting slide rail);

[0023] FIG. 3 is a structural schematic diagram of a transmission mechanism of a laser welding device according to an embodiment of the present disclosure;

[0024] FIG. 4 is a structural schematic diagram of a preset distance and a preset angle of a laser welding device according to an embodiment of the present disclosure;

[0025] FIG. 5 is a structural schematic diagram of a laser transmission path of a laser welding device according to an embodiment of the present disclosure;

[0026] FIG. 6 is a sectional view of a laser transmission path of a laser welding device according to an embodiment of the present disclosure;

[0027] FIG. 7 is a structural schematic diagram of beam coupling of a laser welding device according to an embodiment of the present disclosure;

[0028] FIG. 8 is a first cross-sectional structural schematic diagram of a shaping portion of a laser welding device according to an embodiment of the present disclosure;

[0029] FIG. 9 is a second cross-sectional structural schematic diagram of a shaping portion of a laser welding device according to an embodiment of the present disclosure;

[0030] FIG. 10 is a third cross-sectional structural schematic diagram of a shaping portion of a laser welding device according to an embodiment of the present disclosure;

[0031] FIG. 11 is a fourth cross-sectional structural schematic diagram of a shaping portion of a laser welding device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] To make the purposes, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0033] Embodiment one

[0034] Referring to FIGS. 1-11, the laser welding device of the present disclosure includes a laser emitting source 1, the laser emitting source 1 is connected with an emitting mechanism 2, the laser emitted by the laser emitting source 1 forms a laser beam through the emitting mechanism 2, and the laser beam forms a welding area 3 around the product to be welded.

[0035] The battery includes a battery cell, two end covers 22, and a Mylar film 21, the two end covers 22 are respectively located at two ends of the battery cell, and the Mylar film 21 is wrapped on the side of the battery cell and the end cover 22. In the manufacturing process of the battery, the Mylar film 21 is welded on the end cover 22. Therefore, the present disclosure proposes a laser welding device to perform laser welding on the end cover 22 and the Mylar film 21. Specifically, the laser welding device of the present disclosure includes a laser emitting source 1, which adopts a semiconductor laser. The semiconductor laser is used to weld the end cover 22 and the Mylar film 21, which will not cause the phenomenon of adhesion and wire drawing, and does not need to be frequently maintained (when the existing technology uses a hot melting head for welding, it often needs to be replaced due to adhesion and wire drawing), which is beneficial to realize high-quality welding of the film. Optionally, the laser emitting source 1 is connected with an emitting mechanism 2, the emitting mechanism 2 is provided with a plurality of emitting mechanisms 2, as shown in FIGS. 1 and 3, the laser emitted by the laser emitting source 1 forms a plurality of laser beams 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 product to be welded (the end cover 22 and the Mylar film 21). The welding area 3 is a circumferential welding area, and the plurality of laser beams in the circumferential welding area can weld the periphery of the end cover 22 and the Mylar film 21 to be welded in the circumferential welding area. The relative rotation between the laser and the product to be welded (the end cover 22 and the Mylar film 21) is not needed, which effectively improves the welding efficiency of the end cover 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 size of the welding seam and the welding area are accurately controllable. Among them, the Mylar film 21 and the end cover 22 are both polyethylene materials, the polyethylene material is a thermoplastic material, the light transmittance of the Mylar film 21 is >20%, the end cover 22 is a black non-light-transmitting material, which meets the welding conditions and is convenient for laser welding.

[0036] In some embodiments, the laser beams in the welding area 3 perform synchronous welding.

[0037] As shown in FIG. 1, the welding area 3 is a circumferential welding area, and the multiple laser beams in the circumferential welding area can synchronously weld the periphery of the end cover 22 and the Mylar film 21 to be welded, so that the laser welding of the end cover 22 and the Mylar film 21 can be realized at one time, and the welding efficiency of the laser welding of the end cover 22 and the Mylar film 21 is further improved.

[0038] In some embodiments, the laser welding device further comprises a light splitting mechanism 4 and a transmission mechanism 5. The light splitting mechanism 4 splits the laser emitted by the laser emitting source 1 to form a laser branch, and the transmission mechanism 5 transmits the laser of the laser branch to the corresponding exit mechanism 2.

[0039] As shown in FIG. 1, the laser welding device further comprises a light splitting mechanism 4 and a transmission mechanism 5. Specifically, the laser emitted by the laser emitting source 1 is first transmitted to the light splitting mechanism 4, and the light splitting mechanism 4 splits the laser emitted by the laser emitting source 1 to form multiple laser branches. The laser of each laser branch can be used for laser welding to realize circumferential welding. Optionally, the transmission mechanism 5 is provided with the exit mechanism 2, the transmission mechanism 5 transmits the laser of each laser branch to the corresponding exit mechanism 2, and the multiple laser beams passing through the exit mechanism 2 form the welding area 3, so as to simultaneously circumferentially weld the end cover 22 and the Mylar film 21 to be welded through the multiple exit mechanisms 2.

[0040] In some embodiments, the transmission mechanism 5 is further provided with a laser transmission channel 6, the exit mechanism 2 is arranged on the transmission mechanism 5, one end of the laser transmission channel 6 is communicated with the corresponding laser branch, and the other end of the laser transmission channel 6 transmits the laser of the laser branch to the corresponding exit mechanism 2.

[0041] The conducting mechanism 5 is provided with a plurality of laser transmission channels 6, as shown in FIG. 6, so as to transmit the laser of the laser branch to the corresponding exit mechanism 2, so that the laser passing through the exit mechanism 2 performs circumferential welding on the end cover 22 and the Mylar film 21 to be welded. Specifically, a plurality of exit mechanisms 2 are arranged on the conducting mechanism 5, and the laser transmission channel 6 is arranged between the corresponding exit mechanism 2 and the laser branch, that is, one end of the laser transmission channel 6 is communicated with the corresponding laser branch, so as to realize the transmission of the laser on the laser branch to the corresponding laser transmission channel 6; the other end of the laser transmission channel 6 transmits the laser of the laser branch to the corresponding exit mechanism 2, so as to facilitate the laser passing through the exit mechanism 2 to perform circumferential welding on the end cover 22 and the Mylar film 21 to be welded. Optionally, the laser of the laser branch is transmitted through the laser transmission cable 16 (optical fiber), as shown in FIG. 1, the laser transmission cable 16 is arranged between the light splitting mechanism 4 and the conducting mechanism 5, the light splitting mechanism 4 is provided with a plurality of laser outlets 17, and in addition, the conducting mechanism 5 is provided with a fixing seat 18, as shown in FIG. 3, the fixing seat 18 is arranged to fix the laser transmission cable 16, so that one end of the laser transmission cable 16 is communicated with the corresponding laser outlet 17 on the light splitting mechanism 4, so as to realize the transmission of the laser of the plurality of laser branches of the light 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 communicated with the corresponding laser transmission channel 6, so as to transmit the laser on each laser transmission cable 16 to the laser transmission channel 6 on the conducting mechanism 5.

[0042] In some embodiments, the laser transmission channel 6 comprises a collimating mechanism 7 arranged between the corresponding laser branch and the exit mechanism 2, and the collimating mechanism 7 is arranged to collimate the laser of the laser branch into a parallel light beam.

[0043] As shown in FIG. 6, the laser transmission channel 6 comprises a collimating mechanism 7, and the collimating mechanism 7 collimates the laser of the laser transmission cable 16 into a parallel light beam. Specifically, the collimating mechanism 7 adopts a collimating mirror, the divergent laser on the laser branch is transmitted to the collimating mirror, and the collimating mirror collimates the divergent laser of the laser branch into a parallel light beam, as shown in FIG. 6.

[0044] In some embodiments, the exit mechanism 2 comprises a shaping portion 8, which is located downstream of the collimating mechanism 7 along the laser transmission direction, and the shaping portion 8 is arranged to shape the parallel light beam into a laser beam with a preset shape and size.

[0045] The laser passing through the exit mechanism 2 is used to weld the end cover 22 and the Mylar film 21 to be welded, and the cross section of the parallel light beam passing through the collimator is circular. The parallel light beam can be shaped into a target light beam with different shapes, such as circular, strip-shaped or special-shaped. Therefore, the exit mechanism 2 includes a shaping part 8, as shown in FIGS. 5 and 6. The light spot of the laser beam passing through the shaping part 8 is circular, strip-shaped or special-shaped, as shown in FIGS. 8, 9, 10 and 11. Optionally, the present disclosure selects a strip-shaped pattern. The laser of one laser branch can form a parallel light beam with a diameter corresponding to the specification of the collimator after passing through the collimator with the corresponding specification. For example, collimators with different specifications can form parallel light beams with diameters of 8 mm, 10 mm, 12 mm, etc. The parallel light beams with diameters of 8 mm, 10 mm and 12 mm can be shaped into strip-shaped light spots with sizes of 1 mm*5 mm (preset size) by the shaping part 8. The parallel light beam with a diameter of 10 mm can be shaped into a strip-shaped light spot with a size of 1 mm*8 mm by the shaping part 8. The parallel light beam with a diameter of 12 mm can be shaped into a strip-shaped light spot with a size of 1 mm*10 mm by the shaping part 8. The shaping part 8 of the exit mechanism 2 can be replaced according to actual requirements to meet the configuration of different light spot shapes. The shaping part 8 is a homogenizing sheet or a diffusing sheet. When the shaping part 8 is a homogenizing sheet, the parallel light beam passing through the homogenizing sheet is still a parallel light beam. When the shaping part 8 is a diffusing sheet, the parallel light beam passing through the diffusing sheet is a divergent light beam. At this time, the size of the light spot passing through the shaping part 8 will increase with the increase of the distance between the diffusing sheet. Therefore, a larger light spot can be generated when the diffusing sheet is used. The specific configuration is determined according to actual requirements. When the shaping part 8 is a homogenizing sheet, the focal length is a 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 is 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 is decreased accordingly to decrease 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 a first light spot size. When the first light spot size is increased, the distance between the product to be welded and the diffusing sheet can be increased. At this time, the power of the semiconductor laser can be increased to increase the energy density of the light spot and achieve effective welding. When the first light spot size is decreased, the distance between the product to be welded and the diffusing sheet can be decreased. At this time, the power of the semiconductor laser can be decreased to decrease the energy density of the light spot and achieve effective welding. Therefore, the laser power can be adjusted according to actual requirements. The semiconductor laser can be provided with a corresponding power margin to meet various power laser welding.For example, when the target power for laser welding of the Mylar film 21 and the end cap 22 is 18W, the number of laser branches and the number of the exit mechanisms 2 is ten, the power of the semiconductor laser is 500W, and the laser power of each exit mechanism 2 is 50W, which can provide a power margin for the 18W power. When the energy density of the spot is adjusted according to the actual requirements, 50W can cover the target power size when 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, as shown in FIGS. 5 and 6.

[0046] In some embodiments, the 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 part 8 to form a laser beam with a preset shape and size.

[0047] The lasers of the at least two laser branches can be coupled on the transmission mechanism 5 to configure a spot of a corresponding size according to the actual situation. Specifically, the coupled light beam passes through the corresponding shaping part 8 to form a laser beam with a preset shape and size. For example, two parallel light beams with a diameter of 8mm can be formed after the lasers of the two laser branches pass through the corresponding collimating mirrors, one parallel light beam with a diameter of 8mm can be shaped into a spot with a size of 1mm*5mm after passing through the shaping part 8, and two parallel light beams with a diameter of 8mm can be superimposed and shaped into a strip-shaped spot with a size of 1mm*10mm (preset size) after performing beam coupling and passing through the shaping part 8 (preset shape), as shown in FIG. 7. Therefore, the configuration can be performed according to the actual scene. If a spot with a size of 1mm*15mm is set, three parallel light beams with a diameter of 8mm can be superimposed and shaped into a strip-shaped spot with a size of 1mm*15mm after performing beam coupling and passing through the shaping part 8.

[0048] In some embodiments, the transmission mechanism 5 includes a first transmission mechanism 9 and a second transmission mechanism 10, and the first transmission mechanism 9 and the second transmission mechanism 10 are relatively connected to form a containing cavity 11, and the welding area 3 is located in the containing cavity 11.

[0049] As shown in FIG. 3, the conducting mechanism 5 includes a first conducting mechanism 9 and a second conducting mechanism 10, both of which have a half accommodating cavity. After the two half accommodating cavities are connected, a complete accommodating cavity 11 is formed. The accommodating cavity 11 can be rectangular and is adapted to the shape of the end cover 22. In specific use, first, the end cover 22 to be welded and the end of the Mylar film 21 are placed in the half accommodating cavity of the first conducting mechanism 9. Then, the second conducting mechanism 10 is moved to be connected with the first conducting mechanism 9. The end cover 22 to be welded and the end of the Mylar film 21 are just in the complete accommodating cavity 11, and the welding area 3 is in the accommodating cavity 11, which is convenient for laser welding. Alternatively, first, the end cover 22 to be welded and the end of the Mylar film 21 are placed in the half accommodating cavity of the second conducting mechanism 10. Then, the first conducting mechanism 9 is moved to be connected with the second conducting mechanism 10. The end cover 22 to be welded and the end of the Mylar film 21 are just in the complete accommodating cavity 11, and the welding area 3 is in the accommodating cavity 11, which is convenient for laser welding. Alternatively, first, the end cover 22 to be welded and the end of the Mylar film 21 are placed in the middle of the two half accommodating cavities. Then, the first conducting mechanism 9 and the second conducting mechanism 10 are moved synchronously to be connected. The end cover 22 to be welded and the end of the Mylar film 21 are just in the complete accommodating cavity 11, and the welding area 3 is in the accommodating cavity 11, which is convenient for laser welding. In addition, the first conducting mechanism 9 and the second conducting mechanism 10 can share one laser emitting source 1. For example, one laser emitting source 1 forms twenty laser branches through the light splitting mechanism 4. Any two laser branches are coupled to form a coupled light beam, and there are ten coupled light beams corresponding to ten emitting mechanisms 2. Each long side of the end cover 22 corresponds to four emitting mechanisms 2, and each short side of the end cover 22 corresponds to one emitting mechanism 2. There are ten welds on the end cover 22 and the Mylar film 21 after welding. Alternatively, the first conducting mechanism 9 is equipped with one laser emitting source 1, and the second conducting mechanism 10 is equipped with one laser emitting source 1. There are two laser emitting sources 1, each of which forms ten laser branches. The two laser emitting sources 1 form twenty laser branches in total. Any two laser branches are coupled to form a coupled light beam, and there are ten coupled light beams corresponding to ten emitting mechanisms 2. Each long side of the end cover 22 corresponds to four emitting mechanisms 2, and each short side of the end cover 22 corresponds to one emitting mechanism 2. There are ten welds on the end cover 22 and the Mylar film 21 after welding. The number of laser emitting sources 1, laser branches, and emitting mechanisms 2 can be configured according to actual requirements. Compared with the cost of four sets of hot melting equipment, the cost of one or two lasers is lower, which effectively reduces the welding cost.

[0050] In some embodiments, the first conducting mechanism 9 and / or the second conducting mechanism 10 is slidably arranged on a slide rail 12, the relative interfacing direction of the first conducting mechanism 9 and the second conducting mechanism 10 is the first direction, and the first conducting mechanism 9 and the second conducting mechanism 10 are relatively interfaced or separated along the first direction on the slide rail 12.

[0051] Specifically, the first conducting mechanism 9 is slidably arranged on the slide rail, the second conducting mechanism 10 is fixed, and the interfacing and separation with the second conducting mechanism 10 is realized by the sliding movement of the first conducting mechanism 9 on the slide rail 12; or the second conducting mechanism 10 is slidably arranged on the slide rail, the first conducting mechanism 9 is fixed, and the interfacing and separation with the first conducting mechanism 9 is realized by the sliding movement of the second conducting mechanism 10 on the slide rail 12; or both the first conducting mechanism 9 and the second conducting mechanism 10 are slidably arranged on the slide rail, and the first conducting mechanism 9 and the second conducting mechanism 10 are simultaneously interfaced and separated on the slide rail 12. The interfacing precision of the first conducting mechanism 9 and the second conducting mechanism 10 can be improved by the slide rail 12, and in addition, the sliding power of the first conducting mechanism 9 and the second conducting mechanism 10 can be realized by a cylinder to improve the welding efficiency. The relative interfacing direction of the first conducting mechanism 9 and the second conducting mechanism 10 is the first direction, such as the X direction or the negative X direction as shown in FIG. 2, and then the sliding direction of the first conducting mechanism 9 and the second conducting mechanism 10 on the slide rail 12 is relatively interfaced or separated along the first direction.

[0052] In some embodiments, the two adjacent emitting mechanisms 2 are arranged at a preset distance and / or a preset angle around the accommodating cavity 11.

[0053] As shown in FIG. 4, the plurality of emitting mechanisms 2 are arranged around the end cover 22 and the Mylar film 21 to realize the circumferential welding of the end cover 22 and the Mylar film 21. Specifically, the number of welding marks after welding and the distance between the two adjacent welding marks are designed according to actual requirements, that is, the preset distance D between the two adjacent emitting mechanisms 2 is designed according to actual requirements. As shown in FIG. 4, since the transmission direction of the laser beam passing through the emitting mechanism 2 is perpendicular to the welding surface, the preset distance between the two adjacent emitting mechanisms 2 determines the distance between the two adjacent welding marks. In addition, the angle α between the two adjacent emitting mechanisms 2 can also be designed according to actual conditions. As shown in FIG. 4, the two adjacent emitting mechanisms 2 corresponding to the long side of the end cover are arranged at a preset distance, and the emitting mechanisms 2 on the long side of the end cover and the emitting mechanisms on the short side of the end cover are arranged at a preset angle.

[0054] In some embodiments, the conducting mechanism 5 is provided with a clamping part 13, the emitting mechanism 2 includes a positioning part 14 for positioning the product to be welded, the positioning part 14 is detachably arranged on the corresponding clamping part 13, and the laser beam passes through the corresponding positioning part 14 to form the welding area 3.

[0055] As shown in FIG. 5 and FIG. 6, the emitting mechanism 2 comprises a positioning part 14 which is detachably arranged on the conducting mechanism 5, and the positioning part 14 is used for abutting and positioning the end cover 22 and the Mylar film 21 to be welded. Specifically, the positioning part 14 is made of transparent material, and forms a transparent positioning part, which is convenient for the transmission of laser. Specifically, the conducting mechanism 5 is provided with a plurality of clamping parts 13, and each positioning part 14 is detachably arranged on the corresponding clamping part 13. When the laser welding is performed, the first conducting mechanism 9 is abutted with the second conducting mechanism 10, and then the end cover 22 and the Mylar film 21 are abutted and positioned by the positioning part 14, that is, the positioning part 14 extrudes the Mylar film 21 to make the Mylar film 21 abut on the surface of the end cover 22, so that the laser beam passing through the emitting mechanism 2 can be used to perform laser welding on the end cover 22 and the Mylar film 21. In this way, the laser welding has low maintenance cost, and the positioning part 14 can be cleaned only after two hours, which reduces the maintenance cost compared with the hot melting equipment which has the problem of sticking and drawing wire. In addition, since the positioning part 14 is detachably arranged on the conducting mechanism 5, the position of the positioning part 14 on the conducting mechanism 5 can be adjusted to have different working positions, and the working position corresponds to the position of the corresponding emitting mechanism 2, so that the position of the welding mark on the end cover 22 and the Mylar film 21 after the laser welding can be adjusted.

[0056] In some embodiments, the conducting mechanism 5 is further provided with an elastic mechanism 15, the emitting direction of the laser beam along the emitting mechanism 2 is a second direction, the positioning part 14 is slidably arranged on the clamping part 13 along the front-rear direction of the second direction, one end of the elastic mechanism 15 abuts on the clamping part 13, the other end of the elastic mechanism 15 abuts on the positioning part 14, and the elastic force generated by the elastic mechanism 15 is along the second direction.

[0057] As shown in FIG. 5 and FIG. 6, the conduction mechanism 5 is further provided with an elastic mechanism 15, which makes the positioning part 14 contact and press the Mylar film 21. Specifically, the second direction is the direction of the laser beam along the emitting direction of the emitting mechanism 2, the elastic mechanism 15 is a compression spring, the axis of the compression spring is parallel to the second direction, and the axis of the compression spring can be coincided with the axis of the laser beam, one end of the compression spring abuts against the clamping part 13, and the other end of the compression spring is connected to the positioning part 14. Therefore, the elastic force generated by the spring gives the positioning part 14 an acting force along the second direction. When the first conduction mechanism 9 and the second conduction mechanism 10 are connected, the positioning part 14 first contacts the Mylar film 21 to make the Mylar film 21 abut against the surface of the end cover 22. With the further connection of the first conduction mechanism 9 and the second conduction mechanism 10, the positioning part 14 moves in the opposite direction of the second direction relative to the corresponding conduction mechanism, so that the compression spring is compressed, and the elastic force generated by the compression spring is transmitted to the Mylar film 21 through the positioning part 14, so that the abutting positioning of the end cover 22 and the Mylar film 21 can be realized. The direct positioning by the positioning part 14 is hard contact. Due to manufacturing errors, some positioning parts 14 have a large abutting force on the Mylar film 21, and some positioning parts 14 can not contact the Mylar film 21. Therefore, the hard contact positioning by the positioning part 14 directly can easily damage the Mylar film 21. The extrusion positioning by the spring makes each positioning part 14 effectively contact and position the corresponding Mylar film 21, and the extrusion pressure is relatively uniform, which not only improves the positioning accuracy, but also further improves the welding quality.

[0058] In some embodiments, the second direction is the direction of the laser beam along the emitting direction of the emitting mechanism 2, and the third direction is the direction perpendicular to the second direction. The emitting mechanism 2 is movable to different positions along the third direction.

[0059] The second direction is the direction of the laser beam along the exit mechanism 2, and the third direction is the direction perpendicular to the second direction. Since the exit mechanism 2 is movable to different positions along the third direction, all the third directions are in the same vertical plane, and the exit mechanism 2 in different positions has different positions relative to the Mylar film 21 and the end cover 22. Therefore, the formed weld mark positions after the exit mechanism 2 performs laser welding on the Mylar film 21 and the end cover 22 are different, and the weld mark positions shown in FIGS. 8 and 9 can be achieved. Alternatively, the laser transmission cable 16 transmits the laser of the laser branch. The laser transmission cable 16 is fixed on the transmission mechanism 5 at one end through the fixing seat 18. Therefore, as shown in the figure, the fixing seat 18, the collimating mechanism 7, and the exit mechanism 2 (the shaping part 8 and the positioning part 14) corresponding to the same laser transmission path 6 can be installed as a whole on the mounting seat 19. When the mounting seat 19 is moved, the fixing seat 18, the collimating mechanism 7, and the exit mechanism 2 (the shaping part 8 and the positioning part 14) are synchronously moved as a whole. This can not only ensure the normal transmission of the laser, but also make the exit mechanism 2 have different positions. Therefore, the weld mark positions generated when the exit mechanism 2 performs welding on the end cover 22 and the Mylar film 21 can be adjusted. Alternatively, as shown in FIG. 3, the transmission mechanism 5 is provided with a sliding installation groove 20, and the mounting seat 19 is slidably installed in the installation sliding groove 20. The sliding direction of the mounting seat 19 in the installation sliding groove 20 is along the Y direction or the negative Y direction.

[0060] Example two

[0061] A laser welding system is provided, which includes a laser welding device. The laser welding system includes a control module configured to control a laser emitting source 1 to emit laser for laser welding. The laser emitting source 1 of the laser welding device is connected with an exit mechanism 2. The laser emitted by the laser emitting source 1 forms a laser beam through the exit mechanism 2, and the laser beam passing through the exit mechanism 2 forms a welding area 3.

[0062] The laser welding machine system of the present disclosure comprises a control module, the control module controls the laser emission source 1 to emit laser, 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, that is, each emission mechanism 2 forms a laser beam, the plurality of laser beams formed by the plurality of emission mechanisms 2 form a welding area 3 around the end cover 22 and the Mylar film 21 to be welded, the plurality of emission mechanisms 2 can simultaneously weld the end cover 22 and the Mylar film 21 to be welded through the welding area 3. The control module can control the laser power, welding time and other parameters of the laser emission source 1, so that the laser welding device works in the optimal state. The laser processing device of the present disclosure does not need to realize the relative rotation between the laser emission source 1 and the end cover 22 and the Mylar film 21, improves the laser processing efficiency of the laser processing device, and further improves the laser processing efficiency of the laser processing system.

[0063] It should be noted that the above is only an optional embodiment of the present disclosure and the technical principle applied. Those skilled in the art will understand that the present disclosure is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the present disclosure. Therefore, although the present disclosure has been described in more detail through the above embodiments, the present disclosure is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present disclosure, and the scope of the present disclosure is determined by the scope of the appended claims.

[0064] List of reference signs: 1, laser emission source; 2, emission mechanism; 3, welding area; 4, light splitting mechanism; 5, conduction mechanism; 6, laser transmission channel; 7, collimation mechanism; 8, shaping part; 9, first conduction mechanism; 10, second conduction mechanism; 11, accommodating cavity; 12, slide rail; 13, clamping part; 14, positioning part; 15, elastic mechanism; 16, laser transmission cable; 17, laser outlet; 18, fixing seat; 19, mounting seat; 20, sliding installation groove; 21, Mylar film; 22, end cover.

Claims

1. A laser welding apparatus comprising: A laser emitting source (1) is provided with an emitting mechanism (2), and the laser emitted by the laser emitting source (1) forms a laser beam through the emitting mechanism (2), and the laser beam forms a welding area (3) around a product to be welded.

2. The laser welding device according to claim 1, further comprising a light splitting mechanism (4) and a conducting mechanism (5), the light splitting mechanism (4) splits the laser emitted by the laser emitting source (1) to form a laser branch, and the conducting mechanism (5) transmits the laser of the laser branch to the corresponding emitting mechanism (2).

3. The laser welding apparatus of claim 2, wherein: The conducting mechanism (5) is provided with a laser transmission channel (6), and the emitting mechanism (2) is arranged on the conducting mechanism (5), one end of the laser transmission channel (6) is connected with the corresponding laser branch, and the other end of the laser transmission channel (6) transmits the laser of the laser branch to the corresponding emitting mechanism (2).

4. The laser welding apparatus of claim 3, wherein: The laser transmission channel (6) comprises a collimating mechanism (7) arranged between the corresponding laser branch and the emitting mechanism (2), and the collimating mechanism (7) is arranged to collimate the laser of the laser branch into a parallel light beam.

5. The laser welding apparatus of claim 4, wherein: The emitting mechanism (2) comprises a shaping part (8) arranged downstream of the collimating mechanism (7) along the laser transmission direction, and the shaping part (8) is arranged to shape the parallel light beam into a laser beam with a preset shape and size.

6. The laser welding apparatus of claim 2, wherein: The conducting mechanism (5) comprises a first conducting mechanism (9) and a second conducting mechanism (10), and the first conducting mechanism (9) and the second conducting mechanism (10) are oppositely connected to form a receiving cavity (11), and the welding area (3) is located in the receiving cavity (11).

7. The laser welding device according to claim 6, further comprising a sliding rail (12), and the first conducting mechanism (9) and / or the second conducting mechanism (10) are slidably arranged on the sliding rail (12), the oppositely connecting direction of the first conducting mechanism (9) and the second conducting mechanism (10) is a first direction, and the first conducting mechanism (9) and the second conducting mechanism (10) oppositely connect or separate on the sliding rail (12) along the first direction.

8. The laser welding apparatus of claim 2, wherein: The conducting mechanism (5) is provided with a clamping part (13), the emitting mechanism (2) comprises a positioning part (14) for positioning the product to be welded, the positioning part (14) is detachably arranged on the corresponding clamping part (13), and the laser beam passes through the corresponding positioning part (14) to form the welding area (3).

9. The laser welding apparatus of claim 8, wherein: The conducting mechanism (5) is further provided with an elastic mechanism (15), the emitting direction of the emitting mechanism (2) is a second direction, the positioning part (14) is slidably arranged on the clamping part (13) along the front-rear direction of the second direction, one end of the elastic mechanism (15) abuts against the clamping part (13), the other end of the elastic mechanism (15) abuts against the positioning part (14), and the elastic force generated by the elastic mechanism (15) is along the second direction.

10. A laser welding system comprising: The laser welding device according to any one of claims 1-9, wherein the laser welding system comprises a control module configured to control the laser emitting source (1) to emit laser light for laser welding.

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