Welding device and battery production line

Abstract

The utility model discloses a welding device and a battery production line. The welding device comprises a laser assembly and a pressing plate assembly. The laser assembly is used for emitting laser for welding. And the pressing plate assembly is used for pressing the busbar on the battery module. The pressing plate assembly comprises a pressing plate and a pressing head arranged on the lower side of the pressing plate. The pressing head comprises a cylinder and an adjusting piece. An inner cavity of the cylinder forms a laser channel and is provided with an inlet end located at the axial upper end and an outlet end located at the axial lower end. The adjusting part is arranged on the radial outer side of the barrel and used for applying radial acting force to the barrel to adjust the area of the outlet end of the barrel. The area of the outlet end of the barrel is adjusted through the adjusting piece, so that the pressing head can be matched with busbars of various models, debugging is convenient and fast, the welding process is simplified, time loss caused by replacement of the pressing head is reduced, and welding efficiency is improved. Due to the fact that the pressing head does not need to be replaced with a new pressing head, part purchase cost is reduced, storage space and management cost are reduced, and the application range of the welding device is widened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery welding, in particular to a welding device and a battery production line. BACKGROUND

[0002] The power battery module is formed by connecting a plurality of battery monomers in series through busbars. In the prior art, a copper nozzle is used to press the busbar when welding the busbar and the pole of the battery monomer. However, when welding busbars of different models, different sizes of copper nozzles need to be replaced, which is relatively inconvenient, which affects the welding efficiency to some extent. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the present application provides a welding device and a battery production line to improve the welding efficiency.

[0004] The first aspect of the present application provides a welding device for welding a busbar on a battery module, comprising:

[0005] a laser assembly for emitting laser for welding; and

[0006] a pressing plate assembly for pressing the busbar on the battery module, the pressing plate assembly comprising a pressing plate and a pressing head arranged on the lower side of the pressing plate, the pressing head comprising a barrel and an adjusting piece, the inner cavity of the barrel forms a laser channel and has an inlet end at the axial upper end and an outlet end at the axial lower end, the adjusting piece is arranged on the radial outer side of the barrel and is used to apply a radial force to the barrel to adjust the area of the outlet end of the barrel.

[0007] The area of the outlet end of the barrel is adjusted by the adjusting piece, so that the pressing head can adapt to busbars of various models, and the adjustment is convenient, thereby simplifying the welding process, reducing the time loss caused by replacing the pressing head, and improving the welding efficiency. Since there is no need to replace the new pressing head, the part procurement cost is also reduced, thereby reducing the storage space and management cost, and improving the application range of the welding device.

[0008] In some embodiments, the barrel comprises an annular seat and a plurality of pressing pieces, the annular seat is connected with the pressing plate, and the plurality of pressing pieces are distributed circumferentially along the annular seat and the plurality of pressing pieces circumferentially enclose the laser channel.

[0009] In this way, the area of the outlet end of the barrel is adjusted, and the adjustment process is simple.

[0010] In some embodiments, the barrel further comprises a retaining edge, the retaining edge is located on the inner surface of the pressing piece, the inner surface of the pressing piece constitutes the inner wall surface of the barrel, and the retaining edge protrudes relative to the retaining edge in the width direction of the pressing piece to shield the circumferential gap between the adjacent two pressing pieces.

[0011] By setting the baffle, the circumferential gaps can be well shielded, thereby improving the safety of the welding process.

[0012] In some embodiments, the width of the pressing piece gradually narrows in the direction away from the pressing plate, so that the barrel is in the shape of a frustum of a cone.

[0013] This helps to adjust the area of the outlet end of the barrel, so that the area of the outlet end can change in a larger range and can be adapted to more types of busbars.

[0014] In some embodiments, the adjusting piece includes a first adjusting piece and a second adjusting piece, both of which are annular structures and are respectively sleeved at different positions in the axial direction of the barrel to apply a radial force to the barrel at different axial positions of the barrel to adjust the area of the outlet end of the barrel.

[0015] With this scheme, the operation process is simple and reliable, and the gap between the pressing pieces can be shielded, thereby improving the safety and reliability of the welding process.

[0016] In some embodiments, the adjusting piece includes a clamp, which is sleeved on the radial outer side of the barrel formed by the plurality of pressing pieces, and adjusts the area of the outlet end in a tightening or loosening manner.

[0017] With the clamp for adjustment, the operation process is simple and reliable. Moreover, the clamp can also shield the gap formed by the pressing pieces to some extent, reducing the welding slag formed in the welding process from entering the barrel through the gap, thereby improving the safety and reliability of the welding process.

[0018] In some embodiments, the barrel further includes a clamping strip and a clamping groove, the clamping strip is arranged on the lower side of the annular seat and extends circumferentially around the annular seat, and the clamping groove is arranged at the end of the pressing piece, and the plurality of pressing pieces are respectively clamped by the clamping grooves.

[0019] With this structure, the pressing piece and the annular seat can be quickly installed and disassembled, improving the efficiency of installing and disassembling the pressing piece.

[0020] In some embodiments, a shroud is further included, which is connected to the lower side of the pressing plate and covers the circumferential outer side of the pressing head, and in the axial direction, the outlet end of the barrel extends out of the shroud.

[0021] The shroud can shield most of the outer surface of the barrel on the outer side of the barrel, reducing the damage of the welding slag formed in the welding process to the pressing piece, improving the safety of the welding process and the service life of the welding device.

[0022] In some embodiments, a machine body and a moving device are further included, the pressing plate assembly is arranged on the moving device, and the moving device is movable relative to the machine body to drive the pressing plate assembly to move.

[0023] The mobile device can drive the pressing plate assembly to move, so that the pressing head is aligned with the welding area on the busbar, and the welding quality is improved.

[0024] In some embodiments, a coordinate acquisition device is further included, the coordinate acquisition device is configured to scan the battery module to acquire a start coordinate and an end coordinate of the welding, and the mobile device is configured to move according to the start coordinate and the end coordinate to drive the pressing plate assembly to move.

[0025] The coordinate acquisition device can cooperate with the mobile device, after the start coordinate and the end coordinate are acquired, the pressing plate assembly is driven by the mobile device to move according to the start coordinate and the end coordinate, and the plurality of welding areas on the busbar are welded, so that the intelligence and automation of the welding device are improved.

[0026] The second aspect of the application provides a battery production line, including the welding device as described above.

[0027] The above description is only a summary of the technical solutions of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments of the application. Obviously, the drawings described below are only some embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the drawings.

[0029] Figure 1 It is a schematic diagram of the welding device cooperating with the mechanical arm for welding in some embodiments of the application.

[0030] Figure 2 It is a schematic diagram of the welding device in some embodiments of the application.

[0031] Figure 3 It is a structural schematic diagram of the pressing head in some embodiments of the application.

[0032] Figure 4 It is a structural schematic diagram of the pressing plate in some embodiments of the application.

[0033] Figure 5 It is a structural schematic diagram of the ring-shaped seat in some embodiments of the application.

[0034] Figure 6 It is a schematic diagram of the pressing head installed on the bottom side of the pressing plate in some embodiments of the application.

[0035] Figure 7is a schematic view of the state of the outlet end of the barrel after the area of the outlet end of the barrel is enlarged according to some embodiments of the present application.

[0036] Figure 8 is a schematic view of the state of the outlet end of the barrel after the area of the outlet end of the barrel is reduced according to some embodiments of the present application.

[0037] Figure 9 is a schematic view of the photographing mechanism and the distance measuring mechanism according to some embodiments of the present application.

[0038] The reference signs are as follows:

[0039] A, battery module; B, mechanical arm; 1, mobile device; 11, X-axis servo mechanism; 12, Y-axis servo mechanism; 13, Z-axis servo mechanism.

[0040] 2, pressing plate.

[0041] 3, pressing head; 31, barrel; 311, annular seat; 312, pressing piece; 313, clamping strip; 314, clamping groove; 315, blocking edge; 32, adjusting piece; 321, first adjusting piece; 322, second adjusting piece.

[0042] 4, shroud.

[0043] 5, photographing mechanism; 51, camera; 52, camera fixing frame.

[0044] 6, distance measuring mechanism; 61, laser range finder; 62, range finder fixing frame. DETAILED DESCRIPTION

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the terms "comprising" and "having," and any variations thereof, as used herein are intended to cover a non-exclusive inclusion.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0047] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0048] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally means that the front and rear associated objects are in an“or” relationship.

[0049] In the description of the embodiments of the application, the term“a plurality of” means more than two (including two), and similarly, “a plurality of groups” means more than two groups (including two groups), and “a plurality of pieces” means more than two pieces (including two pieces).

[0050] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the application.

[0051] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0052] Bus welding is an important part of the assembly process of power battery modules, which is to weld different battery cells through connecting tabs in series and parallel connection, and its quality will directly affect the stability of the battery cell series and the safety of the power battery.

[0053] The applicant found that due to the large variety of battery modules, different copper nozzles need to be replaced for different busbars during welding debugging. The existing copper nozzles are fixed and cannot be adjusted in size. For different busbars, the size of the copper nozzle may not be suitable, and the copper nozzle may interfere with the structure of the busbar when it is pressed, resulting in problems such as virtual welding, welding protection gas not blowing to the weld, unqualified welding appearance, and welding slag. Therefore, the welding copper nozzle of the prior art has low compatibility, and the number of copper nozzle replacements is large, the labor input is large, the changeover time is low, resulting in high overall project changeover cost, and the large number of tooling types is not conducive to management.

[0054] Reference Figures 1 to 3 Some embodiments of the present application provide a welding device for welding a busbar on a battery module A. The welding device includes a laser assembly and a pressure plate assembly. The laser assembly is used to emit laser light for welding. The pressure plate assembly is used to press the busbar against the battery module A. The pressure plate assembly includes a pressure plate 2 and a pressure head 3 arranged on the lower side of the pressure plate 2. The pressure head 3 includes a barrel 31 and an adjusting piece 32. The inner cavity of the barrel 31 forms a laser channel and has an inlet end at the axial upper end and an outlet end at the axial lower end. The adjusting piece 32 is arranged on the radial outer side of the barrel 31 and is used to apply a radial force to the barrel 31 to adjust the area of the outlet end of the barrel 31.

[0055] Specifically, the bottom surface of the pressure plate 2 faces the busbar and presses the busbar, and the inlet end of the barrel 31 is adjacent to the bottom surface of the pressure plate 2 compared to the outlet end. The pressure plate 2 is provided with a mounting hole for mounting the laser assembly, which penetrates in the thickness direction of the pressure plate 2, so that the laser assembly can be mounted from the top surface of the pressure plate 2 and emit laser light toward the bottom surface of the pressure plate 2, so that the laser light passes through the outlet end of the barrel 31 and is emitted to the battery module A, completing the welding. The battery module A includes a plurality of battery cells, and the busbar has a plurality of to-be-welded areas. The to-be-welded areas are used to be welded with the pole posts. After the busbar cover is arranged above the battery module A, the plurality of to-be-welded areas of the busbar correspond to the positions of the pole posts of the plurality of battery cells, respectively. By sequentially welding the plurality of to-be-welded areas, the plurality of battery cells are finally electrically connected.

[0056] Wherein, the profile of the to-be-welded area is substantially the same as the profile of the outlet end of the pressure head 3 (also referred to as a copper nozzle), and the outlet end of the pressure head 3 is used to align the to-be-welded area on the busbar and press the to-be-welded area from above the busbar, so that the busbar and the battery module A remain relatively fixed, thereby reducing the occurrence of virtual welding.

[0057] Since different specifications of battery module A need to be welded with different types of busbars, and the areas of the welding regions of different types of busbars are also different, according to the scheme of the embodiment, the area of the outlet end of the cylinder 31 is adjusted by the adjusting piece 32, so that the pressure head 3 can be adapted to multiple types of busbars, the adjustment is convenient, thereby simplifying the welding process, reducing the time loss caused by replacing the pressure head 3, and improving the welding efficiency. Since a new pressure head does not need to be replaced, the part procurement cost is also reduced, thereby reducing the storage space and management cost, and improving the application range of the welding device.

[0058] Reference Figures 3 to 6 In some embodiments, the cylinder 31 includes an annular seat 311 and a plurality of pressing pieces 312. The annular seat 311 is connected with the pressing plate 2. The plurality of pressing pieces 312 are distributed circumferentially along the annular seat 311, and the plurality of pressing pieces 312 circumscribe to form a laser channel in the circumferential direction.

[0059] Specifically, the annular seat 311 is detachably arranged on the bottom surface of the pressing plate 2. The pressing piece 312 is a long strip structure, and the short edges of the plurality of pressing pieces 312 are arranged in sequence in the circumferential direction on the annular seat 311, which constitutes the inlet end and the outlet end of the cylinder 31, and the long edges of the pressing piece 312 constitute the height of the cylinder 31. The surface of the pressing piece 312 (i.e., the surface composed of length and width) constitutes the side wall of the cylinder 31. The thickness of the pressing piece 312 is the wall thickness of the cylinder 31.

[0060] It is worth understanding that the end face shape of the cylinder 31 circumscribed by the plurality of pressing pieces 312 can be regarded as a regular polygon close to a circle. Moreover, there is a certain gap between the circumferentially adjacent two pressing pieces 312. When it is needed to reduce the area of the outlet end of the cylinder 31, the gap can be made smaller by controlling the adjusting piece 32 to exert a force. If it is needed to expand the area of the outlet end of the cylinder 31, the gap can be made larger by reducing the force exerted by the adjusting piece 32. In this way, the area of the outlet end of the cylinder 31 is easy to adjust, and the adjustment process is simple.

[0061] In some embodiments, the pressing piece 312 is a flexible piece, so that the adjusting piece 32 can adjust the cylinder 31 formed thereby.

[0062] Reference Figure 4 In some embodiments, in the direction away from the pressing plate 2, the width of the pressing piece 312 gradually narrows so that the cylinder 31 is in the shape of a truncated cone.

[0063] Specifically, the width direction of the pressing piece 312 is parallel to the short edge, and the width of the pressing piece 312 is arranged to gradually narrow in the direction away from the pressing plate 2, so that the gap between the adjacent two pressing pieces 312 gradually expands in the direction away from the pressing plate 2, which is helpful to adjust the area of the outlet end of the cylinder 31, so that the outlet end area has a larger change range and can be adapted to more types of busbars.

[0064] In some embodiments, the cylinder 31 further comprises a baffle 315, the baffle 315 is located on the inner surface of the pressing plate 312, the inner surface of the pressing plate 312 constitutes the inner wall surface of the cylinder 31, and the baffle 315 protrudes relative to the baffle 315 in the width direction of the pressing plate 312 to shield the circumferential gap between the adjacent two pressing plates 312.

[0065] Specifically, due to the gradual narrowing of the width of the pressing plate 312, it causes the existence of a plurality of circumferential gaps spaced in the circumferential direction on the side wall of the cylinder 31 formed by the plurality of pressing plates 312, the existence of the circumferential gap may cause the welding slag in the welding process to enter the cylinder 31, thus having certain security risks. By providing the baffle 315, the circumferential gaps can be better shielded, thereby improving the safety of the welding process.

[0066] In some embodiments, the baffle 315 is a long strip structure, the baffle 315 extends from the end of the pressing plate 312 away from the pressing plate 2 to the position near the end of the pressing plate 312 close to the pressing plate 2, thereby improving the shielding effect of the circumferential gap and further improving the safety of the welding process.

[0067] Reference Figure 3 In some embodiments, the adjusting member 32 comprises a clamp. The clamp is sleeved on the radial outer side of the cylinder 31 formed by the plurality of pressing plates 312. The clamp adjusts the area of the outlet end in a tightening or loosening manner.

[0068] Specifically, when the clamp is tightened, the area of the outlet end of the cylinder 31 is reduced, and when the clamp is loosened, the area of the outlet end of the cylinder 31 is expanded, and the operation process is simple and reliable. Moreover, the clamp can also shield the gap formed by the pressing plate 312 to a certain extent, reduce the welding slag formed in the welding process from entering the cylinder 31 through the gap, and thereby improve the safety and reliability of the welding process.

[0069] In some embodiments, the adjusting member 32 comprises a first adjusting member 321 and a second adjusting member 322. The first adjusting member 321 and the second adjusting member 322 are both annular structures, and are respectively sleeved on different positions in the axial direction of the cylinder 31 to apply a radial force to the cylinder 31 at different axial positions of the cylinder 31 to adjust the area of the outlet end of the cylinder 31.

[0070] Specifically, the first adjusting member 321 is closer to the pressure plate 2 than the second adjusting member 322, for example, in the axial direction, the first adjusting member 321 is located near the upper end of the pressing piece 312, and the second adjusting member is located in the middle of the pressing piece 312. By reducing the radial force of the first adjusting member 321 on the barrel 31 and increasing the radial force of the second adjusting member 322 on the barrel 31, the outlet end area of the barrel 31 can be reduced, or by increasing the radial force of the first adjusting member 321 on the barrel 31 and reducing the radial force of the second adjusting member 322 on the barrel 31, the outlet end area of the barrel 31 can be reduced. The operation process is simple and reliable, and can shield the gap between the pressing pieces 312, thereby improving the safety and reliability of the welding process.

[0071] In some embodiments, the first adjusting member 321 and the second adjusting member 322 are respectively a first clamp and a second clamp. When the first clamp is loosened and the second clamp is tightened, the outlet end area of the barrel 31 becomes smaller. When the first clamp is tightened and the second clamp is loosened, the outlet end area of the barrel 31 becomes larger.

[0072] Reference Figure 4 and 5 In some embodiments, the barrel 31 further comprises a clamping strip 313 and a clamping groove 314. The clamping strip 313 is arranged on the lower side of the annular seat 311, and the clamping strip 313 extends circumferentially along the annular seat 311 for one turn. The clamping groove 314 is arranged at the end of the pressing piece 312, and the plurality of pressing pieces 312 are clamped by the clamping groove 314 respectively.

[0073] With this structure, the pressing piece 312 and the annular seat 311 can be quickly installed and disassembled, improving the efficiency of installing and disassembling the pressing piece 312.

[0074] Reference Figure 6 In some embodiments, the welding device further comprises a shield 4 connected to the lower side of the pressure plate 2 and covering the circumferential outer side of the pressure head 3, and in the axial direction, the outlet end of the barrel 31 extends out of the shield 4.

[0075] The shield 4 can shield most of the outer surface of the barrel 31 on the outer side of the barrel 31, reduce the damage of the welding slag splashing during the welding process to the pressing piece 312, and improve the safety of the welding process and the service life of the welding device.

[0076] Reference Figure 2 In some embodiments, the welding device further comprises a machine body and a moving device 1. The pressure plate assembly is arranged on the moving device 1, and the moving device 1 is movable relative to the machine body to drive the pressure plate assembly to move.

[0077] Specifically, the mobile device 1 comprises a three-axis servo mechanism, which specifically comprises an X-axis servo mechanism 11, a Y-axis servo mechanism 12 and a Z-axis servo mechanism 13, the X-axis servo mechanism 11 is parallel to the width direction of the battery module A, the Y-axis servo mechanism 12 is parallel to the length direction of the battery module A, and the Z-axis servo mechanism 13 is parallel to the height direction of the battery module A. The mobile device 1 can drive the pressing plate assembly to move, so that the pressing head 3 is aligned with the welding area on the busbar, and the welding quality is improved.

[0078] Reference Figure 1 In some embodiments, the welding device further comprises a mechanical arm B (only a part of the mechanical arm B is shown by way of example), the end of the mechanical arm B is provided with a laser assembly, and the mechanical arm B is configured to place the laser assembly in the mounting hole on the pressing plate 2, and drive the laser assembly to move synchronously when the three-axis servo mechanism drives the pressing plate 2 to move, so that the laser assembly is always located in the mounting hole, and the stability of the welding process is ensured.

[0079] In some embodiments, the welding device further comprises a coordinate acquisition device. The coordinate acquisition device is configured to scan the battery module A to obtain the starting point coordinates and the end point coordinates of the welding. The mobile device is configured to move according to the starting point coordinates and the end point coordinates to drive the pressing plate assembly to move.

[0080] The coordinate acquisition device can cooperate with the three-axis servo mechanism. After the starting point coordinates and the end point coordinates are obtained, the pressing plate assembly is driven to move according to the starting point coordinates and the end point coordinates by the three-axis servo mechanism, so that the plurality of welding areas on the busbar are welded, and the intelligence and automation of the welding device are improved.

[0081] Reference Figure 2 And 9 In some embodiments, the coordinate acquisition device comprises a photographing mechanism 5 and a distance measuring mechanism 6. The photographing mechanism 5 photographs the position of the battery module A and the surrounding environment, and the starting point coordinates and the end point coordinates of the welding process are extracted by using image processing technology. The distance measuring mechanism 6 measures the distance by using laser, ultrasonic wave or other sensors, and finally obtains the starting point coordinates and the end point coordinates. By combining the coordinates obtained by the photographing mechanism 5 and the coordinates obtained by the distance measuring mechanism 6, the accuracy of the finally measured coordinate data can be improved, the welding process can be smoothly completed, the precision of the welding position is improved, and the welding quality is improved. Moreover, the photographing mechanism 5 and the distance measuring mechanism 6 also enable the welding device to have automatic positioning and foolproof functions.

[0082] In some embodiments, the photographing mechanism 5 comprises a camera 51 and a camera fixing frame 52. The camera fixing frame 52 is arranged on the machine body, and the camera 51 is arranged on the camera fixing frame 52.

[0083] In some embodiments, the distance measuring mechanism 6 comprises a laser distance meter 61 and a distance meter fixing frame 62, the distance meter fixing frame 62 is arranged on the machine body, and the laser distance meter 61 is arranged on the distance meter fixing frame 62.

[0084] Some embodiments of the present application also provide a battery production line comprising the welding device as described above.

[0085] The welding device of one specific embodiment of the present application is introduced below.

[0086] The welding device comprises a machine body, a moving device 1, a pressing plate 2, a pressing head 3, a protective cover 4, a photographing mechanism 5, a distance measuring mechanism 6 and a laser assembly.

[0087] The moving device 1 is arranged on the machine body, the pressing plate 2 is arranged on the moving device 1, and the pressing head 3 is arranged on the bottom side of the pressing plate 2. The pressing head 3 is used to press the busbar. The moving device 1 is used to drive the pressing plate 2 to move, so that the pressing head 3 is aligned with the welding area of the busbar. The laser assembly is used to emit laser through the center of the pressing head 3 for welding.

[0088] The moving device 1 is a three-axis servo mechanism, which specifically comprises an X-axis servo mechanism 11, a Y-axis servo mechanism 12 and a Z-axis servo mechanism 13. The X-axis servo mechanism 11 moves along the X direction, the Y-axis servo mechanism 12 moves along the Y direction, and the Z-axis servo mechanism 13 moves along the Z direction.

[0089] The pressing head 3 is arranged on the bottom side of the pressing plate 2, wherein the pressing head 3 comprises a ring-shaped seat 311, a plurality of pressing pieces 312, a first clamp, a second clamp, a clamping strip 313, a clamping groove 314 and a blocking edge 315. The clamping groove 314 is arranged at the end of the pressing piece 312, the clamping strip 313 extends circumferentially on the bottom side of the ring-shaped seat 311, the pressing piece 312 is detachably connected with the ring-shaped seat 311 through the clamping groove 314, and the plurality of pressing pieces 312 are circumferentially distributed on the ring-shaped seat 311 to form a cylinder 31. The laser assembly is used to emit laser through the outlet end of the cylinder 31 for welding. The outlet end of the cylinder 31 is used to press the welding area on the busbar. The first clamp and the second clamp are sleeved on the outside of the cylinder 31, the first clamp is located near the pressing plate 2 of the cylinder 31, and the second clamp is located in the middle of the cylinder 31. By tightening or loosening the first clamp and the second clamp, the area of the outlet end of the cylinder 31 can be adjusted.

[0090] The photographing mechanism 5 comprises a camera 51 and a camera fixing frame 52. The camera fixing frame 52 is arranged on the machine body, and the camera 51 is arranged on the camera fixing frame 52.

[0091] The distance measuring mechanism 6 comprises a laser distance meter 61 and a distance meter fixing frame 62, the distance meter fixing frame 62 is arranged on the machine body, and the laser distance meter 61 is arranged on the distance meter fixing frame 62

[0092] The main working principle and use method are introduced as follows:

[0093] Firstly, according to the current module variety, the tightness of the first and second clamps is adjusted, so that the outlet end area of the cylinder 31 meets the demand.

[0094] Secondly, the motion coordinate parameters of the three-axis servo mechanism are calibrated (manual calibration: the motion coordinates in x and y directions are calculated manually by inquiring the module parameters; automatic calibration: the module information is automatically obtained by interacting with the production system and the motion coordinates in x and y directions are calculated).

[0095] Thirdly, the calibration of the photographing mechanism 5 and the distance measuring mechanism 6 is started. The photographing mechanism 5 and the distance measuring mechanism 6 scan the whole working area from the standby position through the three-axis servo mechanism, and then the starting coordinate parameters of welding are obtained.

[0096] Fourthly, welding is carried out.

[0097] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in each embodiment can be combined in any manner, provided that there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A welding apparatus for welding a busbar to a battery module (A), characterized in that, include: Laser assembly, used to emit laser light for welding; and A pressure plate assembly is used to press the busbar onto the battery module (A). The pressure plate assembly includes a pressure plate (2) and a pressure head (3) disposed on the lower side of the pressure plate (2). The pressure head (3) includes a cylinder (31) and an adjusting member (32). The inner cavity of the cylinder (31) forms a laser channel and has an inlet end located at the upper axial end and an outlet end located at the lower axial end. The adjusting member (32) is disposed on the radially outer side of the cylinder (31) and is used to apply a radial force to the cylinder (31) to adjust the area of ​​the outlet end of the cylinder (31).

2. The welding apparatus according to claim 1, characterized in that, The cylinder (31) includes an annular seat (311) and a plurality of pressure plates (312). The annular seat (311) is connected to the pressure plate (2). The plurality of pressure plates (312) are distributed circumferentially along the annular seat (311) and the plurality of pressure plates (312) surround each other in the circumferential direction to form the laser channel.

3. The welding apparatus according to claim 2, characterized in that, The cylinder (31) also includes a retaining edge (315), which is located on the inner surface of the pressing plate (312). The inner surface of the pressing plate (312) forms the inner wall surface of the cylinder (31), and the retaining edge (315) extends relative to the retaining edge (315) in the width direction of the pressing plate (312) to cover the circumferential gap between two adjacent pressing plates (312).

4. The welding apparatus according to claim 2, characterized in that, In the direction away from the pressure plate (2), the width of the pressure plate (312) gradually narrows so that the cylinder (31) is frustoconical.

5. The welding apparatus according to claim 2, characterized in that, The adjusting member (32) includes a first adjusting member (321) and a second adjusting member (322). Both the first adjusting member (321) and the second adjusting member (322) are annular structures and are respectively sleeved at different positions in the axial direction of the cylinder (31) to apply radial force to the cylinder (31) at different axial positions to adjust the area of ​​the outlet end of the cylinder (31).

6. The welding apparatus according to claim 2, characterized in that, The adjusting member (32) includes a clamp that is fitted on the radially outer side of the cylinder (31) formed by the plurality of the pressing plates (312), and the clamp adjusts the area of ​​the outlet end by tightening or loosening.

7. The welding apparatus according to claim 2, characterized in that, The cylinder (31) also includes a retaining strip (313) and a retaining groove (314). The retaining strip (313) is disposed on the lower side of the annular seat (311) and extends around the annular seat (311) in a circumferential direction. The retaining groove (314) is disposed at the end of the pressing plate (312) and the pressing plate (312) engages with the retaining groove (314) through the retaining groove (314).

8. The welding apparatus according to claim 1, characterized in that, It also includes a protective cover (4), which is connected to the lower side of the pressure plate (2) and covers the circumferential outer side of the pressure head (3), and in the axial direction, the outlet end of the cylinder (31) extends out from the protective cover (4).

9. The welding apparatus according to any one of claims 1 to 8, characterized in that, It also includes a body and a moving device (1), the pressure plate assembly is disposed on the moving device (1) and the moving device (1) is movable relative to the body to drive the pressure plate assembly to move.

10. The welding apparatus according to claim 9, characterized in that, It also includes a coordinate acquisition device configured to scan the battery module (A) to obtain the starting point coordinates and the ending point coordinates of the welding, and the moving device configured to move according to the starting point coordinates and the ending point coordinates to drive the pressure plate assembly to move.

11. A battery production line, characterized in that, The welding apparatus includes any one of claims 1 to 10.

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