Laser pre-welding device, battery production line and battery

Abstract

The invention provides a laser pre-welding device, a battery production line and a battery, and belongs to the technical field of batteries. The laser pre-welding device comprises a laser welding assembly, a first clamp assembly and a second clamp assembly. The first clamp assembly and the second clamp assembly are used for clamping a battery to be welded in the axial direction. The laser welding assembly is located above the battery to be welded. The laser welding assembly comprises a laser device and a vibration lens, and the vibration lens is located at the light emitting end of the laser device and used for guiding a laser beam emitted by the laser device to a pre-welding point position of the battery to be welded and guiding the laser beam to move in the extending direction of a welding seam of the battery to be welded and conduct reciprocating scanning on the two sides of the welding seam at the same time. According to the laser pre-welding device, the pre-welding quality of the to-be-welded battery can be guaranteed, and then the pre-welding quality of the to-be-welded battery in the subsequent full welding process is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a laser pre-welding device, a battery production line and a battery. Background Art

[0002] With the development of new energy technology, the market demand for batteries is very strong. This requires battery manufacturers to continuously improve the manufacturing efficiency of batteries. In the manufacturing process of new energy batteries, the efficiency and quality of shell sealing welding are crucial. Before shell sealing welding, the unwelded battery cells need to be pre-welded.

[0003] The laser pre-welding devices in the related art generally have the problems of low welding strength and low welding efficiency. Summary of the invention

[0004] The present application provides a laser pre-welding device, a battery production line and a battery, which can solve the common problems of low welding strength and low welding efficiency in laser pre-welding devices.

[0005] The technical solution is as follows:

[0006] In one aspect, a laser pre-welding device is provided, the laser pre-welding device comprising: a laser welding assembly, a first fixture assembly, and a second fixture assembly;

[0007] The first clamp assembly and the second clamp assembly are arranged opposite to each other at intervals, and the first clamp assembly and the second clamp assembly are used to clamp the battery to be welded in the axial direction; the laser welding assembly is located above the battery to be welded;

[0008] The laser welding assembly includes a laser and a galvanometer lens. The galvanometer lens is located at the light output end of the laser and is used to guide the laser beam emitted by the laser to the pre-welding point of the battery to be welded, and guide the laser beam to move along the extension direction of the weld of the battery to be welded while scanning back and forth on both sides of the weld.

[0009] In some embodiments, the scanning trajectory of the laser beam is at least one of a spiral trajectory, a sinusoidal trajectory, and a wavy trajectory.

[0010] In some embodiments, when the laser beam scans back and forth on both sides of the weld, the laser energy of the laser is inversely proportional to the spacing between the scanning track and the weld.

[0011] In some embodiments, at least one of the first clamp assembly and the second clamp assembly includes a clamp head;

[0012] The clamp head includes a slotted end and a connecting end, the slotted end is provided with a receiving cavity for receiving one end of the battery to be welded, the side wall of the slotted end is provided with at least one pre-welding groove, the pre-welding point of the battery to be welded is located in the at least one pre-welding groove, and the laser welding assembly can perform laser welding on the pre-welding point through the at least one pre-welding groove.

[0013] In some embodiments, the inner diameter of the accommodating cavity decreases from the opening to the bottom, and the bottom size of the accommodating cavity is less than or equal to the end face size of the battery to be welded.

[0014] In some embodiments, a clearance groove is provided at the bottom of the accommodating cavity, and the projection area of ​​the pre-welding groove along the axial direction of the battery to be welded is smaller than the end face area of ​​the battery to be welded, and the pre-welding groove is used to reduce the contact area between the bottom surface of the accommodating cavity and the end face of the battery to be welded.

[0015] In some embodiments, the number of the pre-welding grooves is multiple, and the multiple pre-welding grooves are arranged on the side wall of the slotted end at intervals along the circumferential direction, and each of the pre-welding grooves corresponds to at least one pre-welding point;

[0016] At least one of the first clamp assembly and the second clamp assembly also includes a rotating mechanism, and the clamp head is connected to the rotating mechanism. The rotating mechanism is used to drive the clamp head to rotate around the axis of the battery to be welded, and the clamp head drives the battery to be welded to rotate so that different pre-welding grooves and corresponding pre-welding points are facing upwards.

[0017] In some embodiments, at least one of the first clamp assembly and the second clamp assembly further includes a clamping mechanism, the clamp head is connected to the clamping mechanism, and the clamping mechanism is used to provide a clamping force to the clamp head along the axial direction of the battery to be welded.

[0018] In some embodiments, at least one of the first clamp assembly and the second clamp assembly further includes a detection mechanism, and the detection mechanism is used to detect the distance between the first clamp assembly and the second clamp assembly to determine the clamping state of the battery to be welded.

[0019] In some embodiments, the laser pre-welding device further includes a feeding assembly, and the feeding assembly is used to transport the battery to be welded between the first clamp assembly and the second clamp assembly.

[0020] On the other hand, a battery production line is provided, which includes the laser pre-welding device described in the present application.

[0021] On the other hand, a battery is provided, wherein the battery is pre-welded using the laser pre-welding device described in the present application, or is processed using the battery production line described in the present application.

[0022] The beneficial effects of the technical solution provided by this application include at least:

[0023] The laser pre-welding device of the present application utilizes a first clamp assembly and a second clamp assembly to clamp the battery to be welded from both axial ends. The laser beam emitted by the laser in the laser welding assembly can be guided by a galvanometer lens to perform fast, high-precision precision pre-welding on the pre-welding points of the battery to be welded, thereby increasing the efficiency of pre-welding of the battery to be welded. Moreover, the galvanometer lens guides the laser beam to perform reciprocating scanning welding along a scanning trajectory based on the weld seam. Compared with the traditional spot welding method, the reciprocating scanning welding has better pre-welding strength, which can ensure the pre-welding quality of the battery to be welded, thereby improving the pre-welding quality of the battery to be welded in the subsequent full welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 is a schematic structural diagram of a laser pre-welding device provided in an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the positions of the laser welding assembly and the battery to be welded provided in an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of a scanning trajectory provided in an embodiment of the present application;

[0028] Figure 4 is a schematic diagram of a scanning trajectory provided by another embodiment of the present application;

[0029] Figure 5 is a schematic diagram of the change of laser energy provided in an embodiment of the present application;

[0030] Figure 6 is a schematic diagram of clamping a battery to be welded provided in an embodiment of the present application;

[0031] Figure 7 is a clamping exploded view of a battery to be welded provided in an embodiment of the present application;

[0032] Figure 8 This is a schematic diagram of the structure of the clamp head provided in the embodiment of the present application. Figure 1 ;

[0033] Fig. 9 This is a schematic diagram of the structure of the clamp head provided in the embodiment of the present application. Figure 2 ;

[0034] Fig.10 It is a schematic diagram of the structure of the first clamp assembly or the second clamp assembly provided in an embodiment of the present application.

[0035] The reference numerals in the figures represent respectively:

[0036] 100. Batteries to be welded;

[0037] 1001, weld; 10011, pre-welding point;

[0038] 1002, a first battery cover; 1003, a second battery cover;

[0039] 1. Laser welding components;

[0040] 11. Laser; 12. Galvanometer lens; 13. Gantry;

[0041] 21. a first fixture assembly; 22. a second fixture assembly;

[0042] 23, fixture head; 231, slotted end; 2311, accommodating cavity; 2312, pre-welding groove; 2313, air avoidance groove; 232, connecting end; 2321, connecting hole;

[0043] 24. Rotating mechanism;

[0044] 25. Tightening mechanism;

[0045] 26. Testing agency;

[0046] 3. Feeding components;

[0047] 4. Dust removal components. DETAILED DESCRIPTION

[0048] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] It should be understood that "connected" and "connected" can refer to a mechanical connection relationship or a physical connection relationship, that is, A and B are connected or A and B are connected can mean that there are fastening components (such as screws, bolts, rivets, etc.) between A and B, or A and B are in contact with each other and A and B are difficult to separate.

[0051] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art.

[0052] Pre-welding usually refers to a preliminary welding operation performed before formal welding, and its purposes include:

[0053] Fix the weldment: Before the formal welding, the various parts of the weldment are initially fixed together to ensure that their relative positions are accurate and prevent displacement during the subsequent welding process, thereby ensuring the welding quality and dimensional accuracy of the weldment.

[0054] Improve welding efficiency: Through pre-welding, some parts that are difficult to weld or require special treatment can be processed in advance to prepare for formal welding, reduce the adjustment and processing time during formal welding, and improve the overall welding efficiency.

[0055] Improve welding quality: Pre-welding can clean and pre-treat the surface of the weldment, remove impurities such as oil, rust, and scale, and at the same time make the surface of the weldment form a certain degree of roughness, which is beneficial to improve the bonding strength between the weld deposited metal and the base material, reduce the occurrence of welding defects, and improve the welding quality.

[0056] During the manufacturing process of the battery, the shell sealing welding also needs to be pre-welded to improve the welding quality. However, in the related art, the pre-welding of the battery cover is usually carried out using spot welding equipment, and a short-term current pulse is applied on the contact surface of the weldment at a certain distance to heat and melt the metal at the contact point to form a weld, thereby fixing the weldment together. The advantages of spot welding are fast speed, simple operation, and applicability to various metal materials and weldment structures. However, spot welding also has the problem of low welding strength, especially the winding core inside the battery has a certain core rebound, which may cause the weld to crack and the pre-welding to fail, resulting in a decrease in the assembly accuracy of the cover and the shell during the subsequent full welding process, causing the problem of poor full welding.

[0057] Therefore, the present application provides a laser pre-welding device, a battery production line and a battery, which can ensure the pre-welding quality of the battery to be welded, thereby improving the pre-welding quality of the battery to be welded in the subsequent full welding process.

[0058] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0059] On the one hand, combined with Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, this embodiment provides a laser pre-welding device, which includes: a laser welding assembly 1, a first clamp assembly 21 and a second clamp assembly 22. The first clamp assembly 21 and the second clamp assembly 22 are arranged opposite to each other at intervals, and the first clamp assembly 21 and the second clamp assembly 22 are used to clamp the battery 100 to be welded along the axial direction; the laser welding assembly 1 is located above the battery 100 to be welded.

[0060] The laser welding assembly 1 includes a laser 11 and a galvanometer lens 12. The galvanometer lens 12 is located at the light output end of the laser 11 and is used to guide the laser beam emitted by the laser 11 to the pre-welding point 10011 of the battery 100 to be welded, and guide the laser beam to move along the extension direction of the weld 1001 of the battery 100 to be welded while scanning back and forth on both sides of the weld 1001.

[0061] The laser pre-welding device of this embodiment utilizes the first clamp assembly 21 and the second clamp assembly 22 to clamp the battery 100 to be welded from both axial ends. The laser beam emitted by the laser 11 in the laser welding assembly 1 can be guided by the galvanometer lens 12 to perform fast and high-precision pre-welding on the pre-welding point 10011 of the battery 100 to be welded, thereby improving the pre-welding efficiency of the battery 100 to be welded.

[0062] Moreover, the galvanometer lens 12 guides the laser beam to perform reciprocating scanning welding along the scanning trajectory with the weld 1001 as the reference. Compared with the traditional spot welding method, the reciprocating scanning welding has better pre-welding strength, which can ensure the pre-welding quality of the battery 100 to be welded, thereby improving the pre-welding quality of the battery 100 to be welded in the subsequent full welding process.

[0063] In some possible implementations, the laser welding assembly 1 is a laser galvanometer welding system, or a galvanometer laser welding machine. Exemplarily, the galvanometer lens 12 is composed of two scanning galvanometers, a focusing lens, and a corresponding control system.

[0064] The two scanning galvanometers are responsible for deflecting the laser beam in the X-axis and Y-axis directions respectively, while the focusing mirror is used to focus the deflected laser beam on the welding point. The control system calculates the required swing angle based on the position signal and controls the swing motor to swing through the voltage signal. The position sensor monitors the swing angle of the galvanometer in real time and feeds back the monitoring results to the control system, realizing precise control of the swing angle of the galvanometer through closed-loop feedback control.

[0065] refer to Figure 2 As shown, the laser welding assembly 1 is located above the battery 100 to be welded, and can form a certain scanning range at the location of the battery 100 to be welded. The scanning range can cover a group of batteries 100 to be welded, and can also cover multiple groups of batteries 100 to be welded at the same time, so that one laser welding assembly 1 can complete the pre-welding process of one or more groups of batteries 100 to be welded.

[0066] Another exemplary embodiment, the laser welding assembly 1 also includes a gantry 13, and the laser 11 and the galvanometer lens 12 are connected to the gantry 13. The gantry 13 can drive the laser 11 and the galvanometer lens 12 to move in space, so that the same laser 11 and the galvanometer lens 12 can be used to cover more batteries 100 to be welded, thereby increasing the range of movement of the laser welding assembly 1, thereby reducing the number of laser welding assemblies 1 used and reducing the equipment cost of the laser pre-welding device.

[0067] In some possible implementations, reference Figure 1 As shown, the laser pre-welding device also includes a dust removal component 4, which is respectively connected to the vicinity of each first clamp component 21 and the second clamp component 22. The dust removal component 4 can use negative pressure to absorb the smoke generated during the laser pre-welding process.

[0068] In some possible implementations, reference Figure 6 and Figure 7As shown, the battery 100 to be welded includes a cylindrical shell, a battery cell, a first battery cover plate 1002 and a second battery cover plate 1003. The two ends of the shell are open respectively, the battery cell is located in the shell, and the first battery cover plate 1002 and the second battery cover plate 1003 are respectively covered on the two ends of the shell. The positive electrode of the battery cell is electrically connected to one of the first battery cover plate 1002 and the second battery cover plate 1003, and the positive electrode of the battery cell is electrically connected to the other of the first battery cover plate 1002 and the second battery cover plate 1003.

[0069] The first clamp assembly 21, the first battery cover plate 1002, the shell, the second battery cover plate 1003 and the second clamp assembly 22 are arranged in sequence along the axial direction. The first clamp assembly 21 presses the first battery cover plate 1002 axially to one end of the shell, and the second clamp assembly 22 presses the second battery cover plate 1003 in the opposite direction to the other end of the shell, so that the assembly of the first battery cover plate 1002, the shell and the second battery cover plate 1003 can be clamped and fixed.

[0070] Among them, there are two welds 1001 between the first battery cover 1002 and the shell, and between the second battery cover 1003 and the shell, respectively. At least one pre-welding point 10011 can be arranged on each weld 1001. The first battery cover 1002 and the shell can be pre-welded together, and the second battery cover 1003 and the shell can be pre-welded together using the pre-welding point 10011.

[0071] Exemplarily, the battery 100 to be welded is a cylindrical battery, the shell is cylindrical, the first battery cover 1002 and the second battery cover 1003 are both circular plates, and the two welds 1001 formed after the shell, the first battery cover 1002 and the second battery cover 1003 are initially assembled are both annular welds 1001. There may be one, two, or three pre-welding points 10011 arranged at circumferential intervals on the annular weld 1001. All pre-welding points 10011 may be evenly spaced on the annular weld 1001, or may be unevenly spaced on the annular weld 1001.

[0072] Adjacent pre-welding points 10011 may be spaced at an angle of 30°, 60°, 90°, 180°, etc.

[0073] It should be noted that the shape of the shell can also be elliptical or racetrack-shaped.

[0074] Exemplarily, one of the first battery cover plate 1002 and the second battery cover plate 1003 corresponds to the positive electrode of the battery 100 to be welded, and the other of the first battery cover plate 1002 and the second battery cover plate 1003 corresponds to the negative electrode of the battery 100 to be welded. Exemplarily, one of the first battery cover plate 1002 and the second battery cover plate 1003 is provided with a liquid injection hole, and the other of the first battery cover plate 1002 and the second battery cover plate 1003 is provided with an explosion-proof valve.

[0075] Combination Figure 3 and Figure 4 As shown, in some embodiments, the scanning trajectory of the laser beam at the pre-welding point 10011 is at least one of a spiral trajectory, a sinusoidal trajectory, and a wavy trajectory.

[0076] In this embodiment, when the scanning trajectory of the laser beam at the pre-welding point 10011 is in the above shape, the laser beam can pass through the weld 1001 multiple times, and the welding area and strength can be improved.

[0077] Combination Figure 5 As shown, in some embodiments, when the laser beam scans back and forth on both sides of the weld 1001 , the laser energy of the laser 11 is inversely proportional to the distance a between the scanning track and the weld 1001 .

[0078] In this embodiment, when the laser beam is scanning back and forth, the laser beam needs to turn after scanning to a sufficient distance from the weld 1001, and move toward the other side of the weld 1001. The energy of the laser beam will accumulate at the turning point. Considering that the thickness of the shell of the battery 100 to be welded is limited, once the energy of the laser beam accumulated at the turning point is large, it may cause the shell to burn through. Therefore, as the distance between the scanning track and the weld 1001 continues to increase, the laser energy of the laser beam continues to decrease. When the distance between the scanning track and the weld 1001 is the largest, the laser energy of the laser beam is the smallest (for example, 40%). At this time, the laser beam turns and there will be no large energy accumulation. As the distance between the scanning track and the weld 1001 continues to decrease, the laser energy of the laser beam continues to increase until the distance between the scanning track and the weld 1001 is reduced to zero, the laser energy of the laser beam is the largest (for example, 80%), and the weld 1001 can be laser welded.

[0079] refer to Figure 5 As shown, the horizontal axis is the distance a between the scanning track and the weld 1001, and the vertical axis is the percentage of the laser energy of the laser 11. When the horizontal axis is 0, it means that the scanning track coincides with the weld 1001. When the horizontal axis is -0.4 mm, it means that the scanning track is on one side of the weld 1001. When the horizontal axis is 0.4 mm, it means that the scanning track is on the other side of the weld 1001.

[0080] Exemplarily, the width of the weld 1001 is 0.2 mm, and the laser energy of the laser 11 within the range of ±0.2 mm is set to the highest level.

[0081] Combination Figures 6 to 9 As shown, in some embodiments, at least one of the first clamp assembly 21 and the second clamp assembly 22 includes a clamp head 23 .

[0082] The clamp head 23 includes a slotted end 231 and a connecting end 232. The slotted end 231 is provided with a receiving cavity 2311 for receiving one end of the battery 100 to be welded. The side wall of the slotted end 231 is provided with at least one pre-welding groove 2312. The pre-welding point 10011 of the battery 100 to be welded is located in at least one pre-welding groove 2312. The laser welding assembly 1 can perform laser welding on the pre-welding point 10011 through at least one pre-welding groove 2312.

[0083] Through the above arrangement, the first clamp assembly 21 and the second clamp assembly 22 can respectively clamp and fix one end of the battery 100 to be welded by using the clamp head 23, and the clamp head 23 can stably and reliably clamp the end of the battery 100 to be welded. The pre-welding points 10011 on the welds 1001 at both ends of the battery 100 to be welded can be exposed in the pre-welding groove 2312, and the laser welding assembly 1 can perform laser welding on the pre-welding points 10011 through the pre-welding groove 2312.

[0084] Exemplarily, the first clamp assembly 21 includes the clamp head 23 , or the second clamp assembly 22 includes the clamp head 23 , or the first clamp assembly 21 and the second clamp assembly 22 each include the clamp head 23 .

[0085] In another exemplary embodiment, the number of pre-welding grooves 2312 on each clamp head 23 may be one, two, three, etc. Optionally, the positions of the pre-welding grooves 2312 correspond to the number and positions of the pre-welding points 10011 on the battery 100 to be welded.

[0086] Combination Figure 6 As shown, in some embodiments, the inner diameter of the accommodating cavity 2311 decreases from the opening to the bottom, and the bottom size of the accommodating cavity 2311 is less than or equal to the end face size of the battery 100 to be welded.

[0087] Through the above arrangement, the accommodating cavity 2311 is formed into a conical cavity with a large opening and a small bottom. When the end of the battery 100 to be welded is inserted into the accommodating cavity 2311, the axis of the battery 100 to be welded tends to coincide with the axis of the clamp head 23 due to the guidance of the inner wall of the accommodating cavity 2311, so that the first clamp assembly 21, the battery 100 to be welded and the second clamp assembly 22 have better coaxial parts, and the battery 100 to be welded is accurately positioned, which is conducive to improving the pre-welding accuracy of the battery 100 to be welded.

[0088] Combination Figure 8 As shown, in some embodiments, a void groove 2313 is provided at the bottom of the accommodating cavity 2311, and the projection area of ​​the pre-welding groove 2312 along the axial direction of the battery 100 to be welded is smaller than the end face area of ​​the battery 100 to be welded, and the pre-welding groove 2312 is used to reduce the contact area between the bottom surface of the accommodating cavity 2311 and the end face of the battery 100 to be welded.

[0089] Through the above arrangement, the contact area between the bottom surface of the accommodating cavity 2311 and the end surface of the battery 100 to be welded is smaller, thereby preventing the bottom surface of the accommodating cavity 2311 from adhering to the end surface of the battery 100 to be welded.

[0090] In addition, in some scenarios, the end face of the battery 100 to be welded may have a pole head protruding outward, and the air-avoiding groove 2313 can also be used to accommodate the pole head.

[0091] Combination Figure 8 and Fig. 9 As shown, in some embodiments, there are multiple pre-welding grooves 2312, and the multiple pre-welding grooves 2312 are arranged on the side wall of the slotted end 231 at intervals along the circumferential direction, and each pre-welding groove 2312 corresponds to at least one pre-welding point 10011.

[0092] At least one of the first clamp assembly 21 and the second clamp assembly 22 also includes a rotating mechanism 24, and the clamp head 23 is connected to the rotating mechanism 24. The rotating mechanism 24 is used to drive the clamp head 23 to rotate around the axis of the battery 100 to be welded. The clamp head 23 drives the battery 100 to be welded to rotate so that different pre-welding grooves 2312 and corresponding pre-welding points 10011 face upward.

[0093] Through the above arrangement, in order to improve the pre-welding strength, each weld 1001 of the battery 100 to be welded includes multiple pre-welding points 10011, each pre-welding point 10011 corresponds to a pre-welding groove 2312, and the laser welding component 1 only welds the pre-welding points 10011 in the pre-welding groove 2312 facing upward. After the welding of the pre-welding points 10011 facing upward of the battery 100 to be welded is completed, the rotating mechanism 24 drives the clamp head 23 to rotate, and the clamp head 23 drives the battery 100 to be welded to rotate, so that the other pre-welding groove 2312 and the corresponding pre-welding point 10011 face upward, which is convenient for the laser welding component 1 to perform welding. The laser welding component 1 does not need to frequently adjust its own position, which is beneficial to improving the welding efficiency of the laser welding component 1.

[0094] In addition, in this embodiment, only one set of laser welding components 1 needs to be arranged on the top, which can reduce the number of laser welding components 1 used and reduce equipment costs.

[0095] In some possible implementations, reference Fig. 9 As shown, the connection end 232 of the clamp head 23 is used to connect to the rotating mechanism 24, and the connection end 232 has a connection hole 2321 for connecting to the rotating mechanism 24. The rotating mechanism 24 includes but is not limited to a motor, a rotating cylinder, and the like.

[0096] Combination Fig.10 As shown, in some embodiments, at least one of the first clamp assembly 21 and the second clamp assembly 22 also includes a clamping mechanism 25, and the clamp head 23 is connected to the clamping mechanism 25, and the clamping mechanism 25 is used to provide a clamping force to the clamp head 23 along the axial direction of the battery 100 to be welded.

[0097] Through the above arrangement, the first clamp assembly 21 and the second clamp assembly 22 can respectively move closer to or farther away from each other by using the clamping mechanism 25 to axially clamp the battery 100 to be welded, or release the battery 100 to be welded.

[0098] Combination Fig.10 As shown, in some embodiments, at least one of the first clamp assembly 21 and the second clamp assembly 22 further includes a detection mechanism 26, and the detection mechanism 26 is used to detect the distance between the first clamp assembly 21 and the second clamp assembly 22 to determine the clamping state of the battery 100 to be welded.

[0099] Through the above arrangement, the detection mechanism 26 can be used to detect the distance between the first clamp assembly 21 and the second clamp assembly 22. When the distance between the first clamp assembly 21 and the second clamp assembly 22 reaches the target value, it can be determined that the battery 100 to be welded has been clamped in place, and the laser welding assembly 1 can perform the pre-welding procedure.

[0100] Exemplarily, the detection mechanism 26 may be a photoelectric sensor or a displacement sensor.

[0101] Combination Figure 1 As shown, in some embodiments, the laser pre-welding device further includes a feeding assembly 3, and the feeding assembly 3 is used to transport the battery 100 to be welded between the first clamp assembly 21 and the second clamp assembly 22.

[0102] In order to integrate the laser pre-welding device into the battery production line, a feeding assembly 3 is also provided in this embodiment. The feeding assembly 3 can convey the pre-assembled battery 100 to be welded conveyed by the battery production line to between the first clamp assembly 21 and the second clamp assembly 22, or convey the battery pre-welded between the first clamp assembly 21 and the second clamp assembly 22 back to the battery production line, and the battery production line continues to convey it to the next process.

[0103] Exemplarily, the feeding assembly 3 may be a lifting mechanism, a robotic arm, a shifter, and the like.

[0104] On the other hand, the present embodiment provides a battery production line, which includes the laser pre-welding device of the present application.

[0105] The battery production line of this embodiment adopts the laser pre-welding device of the present application, and has all the beneficial technical effects of all the embodiments in this document.

[0106] On the other hand, the present embodiment provides a battery, which is pre-welded using the laser pre-welding device of the present application, or is processed using the battery production line of the present application.

[0107] The battery of this embodiment is pre-welded using the laser pre-welding device of the present application, or is processed using the battery production line of the present application, and has all the beneficial technical effects of all the embodiments of this document.

[0108] It should be noted that the "several" and "at least one" mentioned in this application refer to one or more, and "multiple" and "at least two" refer to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0109] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0110] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0111] In the description of this specification, the reference terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application.

[0112] The above description is only an embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A laser pre-welding device, characterized in that: The laser pre-welding device comprises: a laser welding assembly (1), a first clamp assembly (21) and a second clamp assembly (22); The first clamp assembly (21) and the second clamp assembly (22) are arranged relative to each other with a spacing therebetween, and the first clamp assembly (21) and the second clamp assembly (22) are used to clamp the battery (100) to be welded in the axial direction; the laser welding assembly (1) is located above the battery (100) to be welded; The laser welding assembly (1) comprises a laser (11) and a galvanometer lens (12); the galvanometer lens (12) is located at the light output end of the laser (11) and is used to guide the laser beam emitted by the laser (11) to the pre-welding point (10011) of the battery (100) to be welded, and guide the laser beam to move along the extension direction of the weld (1001) of the battery (100) to be welded while scanning back and forth on both sides of the weld (1001).

2. The laser pre-welding device according to claim 1, characterized in that: The scanning trajectory of the laser beam is at least one of a spiral trajectory, a sinusoidal trajectory, and a wavy trajectory.

3. The laser pre-welding device according to claim 1, characterized in that: When the laser beam scans back and forth on both sides of the weld (1001), the laser energy of the laser (11) is inversely proportional to the distance a between the scanning track and the weld (1001).

4. The laser pre-welding device according to any one of claims 1 to 3, characterized in that: At least one of the first clamp assembly (21) and the second clamp assembly (22) comprises a clamp head (23); The clamp head (23) comprises a slotted end (231) and a connecting end (232); a receiving cavity (2311) for receiving one end of the battery (100) to be welded is provided inside the slotted end (231); at least one pre-welding groove (2312) is provided on the side wall of the slotted end (231); a pre-welding point (10011) of the battery (100) to be welded is located in the at least one pre-welding groove (2312); and the laser welding assembly (1) can perform laser welding on the pre-welding point (10011) through the at least one pre-welding groove (2312).

5. The laser pre-welding device according to claim 4, characterized in that: The inner diameter of the accommodating cavity (2311) decreases in the direction from the opening to the bottom, and the bottom size of the accommodating cavity (2311) is less than or equal to the end face size of the battery (100) to be welded.

6. The laser pre-welding device according to claim 5, characterized in that: The bottom of the accommodating cavity (2311) is provided with an air avoidance groove (2313); the projection area of ​​the pre-welding groove (2312) along the axial direction of the battery (100) to be welded is smaller than the end surface area of ​​the battery (100) to be welded; the pre-welding groove (2312) is used to reduce the contact area between the bottom surface of the accommodating cavity (2311) and the end surface of the battery (100) to be welded.

7. The laser pre-welding device according to any one of claims 4 to 6, characterized in that: There are a plurality of pre-welding grooves (2312), and the plurality of pre-welding grooves (2312) are arranged at intervals along the circumferential direction on the side wall of the slotted end (231), and each pre-welding groove (2312) corresponds to at least one pre-welding point (10011); At least one of the first clamp assembly (21) and the second clamp assembly (22) further comprises a rotating mechanism (24), the clamp head (23) being connected to the rotating mechanism (24), the rotating mechanism (24) being used to drive the clamp head (23) to rotate around the axis of the battery to be welded (100), the clamp head (23) driving the battery to be welded (100) to rotate, so that different pre-welding grooves (2312) and corresponding pre-welding points (10011) face upwards.

8. The laser pre-welding device according to any one of claims 4 to 7, characterized in that: At least one of the first clamp assembly (21) and the second clamp assembly (22) further comprises a clamping mechanism (25), the clamp head (23) being connected to the clamping mechanism (25), and the clamping mechanism (25) being used to provide a clamping force to the clamp head (23) along the axial direction of the battery (100) to be welded.

9. The laser pre-welding device according to any one of claims 1 to 7, characterized in that: At least one of the first clamp assembly (21) and the second clamp assembly (22) further comprises a detection mechanism (26), wherein the detection mechanism (26) is used to detect the distance between the first clamp assembly (21) and the second clamp assembly (22) to determine the clamping state of the battery (100) to be welded.

10. The laser pre-welding device according to any one of claims 1 to 7, characterized in that: The laser pre-welding device further comprises a feeding assembly (3), wherein the feeding assembly (3) is used to transport the battery (100) to be welded to between the first clamp assembly (21) and the second clamp assembly (22).

11. A battery production line, characterized in that: The battery production line comprises the laser pre-welding device according to any one of claims 1 to 10.

12. A battery, characterized in that: The battery is pre-welded using the laser pre-welding device described in any one of claims 1 to 10, or is processed using the battery production line described in claim 11.

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