Laser pre-welding device, battery production line and battery

Abstract

The utility model 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 technical field of batteries, in particular to a laser pre-welding device, a battery production line and a battery. BACKGROUND

[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 process of manufacturing new energy batteries, the efficiency and welding quality of the shell sealing welding are crucial. Before the shell sealing welding, the un-welded battery cell needs to be pre-welded with the cover.

[0003] The laser pre-welding device in the related art generally has the problems of low welding strength and low welding efficiency. CONTENT OF THE UTILITY MODEL

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

[0005] The technical solution is as follows:

[0006] On the one hand, a laser pre-welding device is provided, which comprises a laser welding assembly, a first clamp assembly and a second clamp assembly;

[0007] The first clamp assembly and the second clamp assembly are arranged in spaced relation, and are used to clamp a battery to be welded in the axial direction; and the laser welding assembly is located above the battery to be welded.

[0008] The laser welding assembly comprises a laser and a galvanometer head, the galvanometer head is located at the light emitting 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 to guide the laser beam to move along the extension direction of the weld of the battery to be welded while reciprocally scanning 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 line trajectory.

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

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

[0012] The clamp head comprises a slotted end and a connecting end, the slotted end is internally provided with a receiving cavity for accommodating 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 receiving cavity decreases in the direction from the opening to the bottom, and the bottom size of the receiving cavity is less than or equal to the end surface size of the battery to be welded.

[0014] In some embodiments, the bottom of the receiving cavity is provided with a clearance groove, the projection area of the pre-welding groove along the axial direction of the battery to be welded is less than the end surface 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 receiving cavity and the end surface of the battery to be welded.

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

[0016] At least one of the first clamp assembly and the second clamp assembly further comprises a rotating mechanism, the clamp head is connected with 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 directed upward.

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

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

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

[0020] In another aspect, a battery production line is provided, the battery production line comprises the laser pre-welding device described in the present application.

[0021] In another aspect, a battery is provided, which is pre-welded by the laser pre-welding device or processed by the battery production line.

[0022] The technical scheme provided by the application has at least the following beneficial effects:

[0023] The laser pre-welding device of the application clamps the battery to be welded from the two axial ends by the first clamp assembly and the second clamp assembly, the laser beam emitted by the laser in the laser welding assembly can be guided by the galvanometer head, the pre-welding point of the battery to be welded is pre-welded quickly and accurately, and the pre-welding efficiency of the battery to be welded is higher; moreover, the galvanometer head guides the laser beam to reciprocally scan the weld along the scanning track, compared with the traditional spot welding mode, the reciprocally scanning welding has better pre-welding strength, which can ensure the pre-welding quality of the battery to be welded, and further improve the pre-welding quality of the battery to be welded in the subsequent full welding process. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a structural schematic view of the laser pre-welding device provided by the embodiment of the application;

[0026] Figure 2 is a position schematic view of the laser welding assembly and the battery to be welded provided by the embodiment of the application;

[0027] Figure 3 is a schematic view of the scanning track provided by the embodiment of the application;

[0028] Figure 4 is a schematic view of the scanning track provided by another embodiment of the application;

[0029] Figure 5 is a variation schematic view of the laser energy provided by the embodiment of the application;

[0030] Figure 6 is a clamping schematic view of the battery to be welded provided by the embodiment of the application;

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

[0032] Figure 8 is a structural schematic view of the clamp head provided by the embodiment of the application Figure 1 ;

[0033] Figure 9 is a structural schematic of a clamp head provided by an embodiment of the present application Figure 2 ;

[0034] Figure 10 is a structural schematic of a first clamp assembly or a second clamp assembly provided by an embodiment of the present application.

[0035] The reference signs in the drawings represent the following:

[0036] 100, a battery to be welded;

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

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

[0039] 1, a laser welding assembly;

[0040] 11, a laser; 12, a galvanometer head; 13, a gantry;

[0041] 21, a first clamp assembly; 22, a second clamp assembly;

[0042] 23, a clamp head; 231, a slotted end; 2311, a receiving cavity; 2312, a pre-welding slot; 2313, a clearance slot; 232, a connecting end; 2321, a connecting hole;

[0043] 24, a rotating mechanism;

[0044] 25, a clamping mechanism;

[0045] 26, a detection mechanism;

[0046] 3, a feeding assembly;

[0047] 4, a dust removal assembly. DETAILED DESCRIPTION

[0048] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals represent like elements or similar elements, unless context dictates otherwise. The following exemplary embodiments described therein represent implementations given as examples only, not exhaustive or definitive of all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with aspects of the present application as set forth in the appended claims.

[0049] In the description of the present application, it should be understood that the 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 drawings shown in the present application, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. Figure 1

[0050] It should be understood that "connection" and "connection" 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, which means that there is a fastening member (such as a screw, a bolt, a rivet, 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 meaning as generally understood by those of ordinary skill in the art.

[0052] Pre-welding generally refers to a pre-welding operation before formal welding, and its purposes include:

[0053] Fixing the welding part: Before formal welding, the parts of the welding part are preliminarily fixed together to ensure the relative positions between them are accurate and prevent displacement during subsequent welding, thereby ensuring the welding quality and the dimensional accuracy of the welding part.

[0054] Improving 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 adjustment and processing time during formal welding, and improve overall welding efficiency.

[0055] Improving welding quality: Pre-welding can clean and pretreat the surface of the welding part to remove impurities such as oil, rust, and oxide scale, and at the same time form a certain roughness on the surface of the welding part, which is beneficial to improve the bonding strength between the welding deposited metal and the base metal, reduce the occurrence of welding defects, and improve the welding quality.

[0056] ​In 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 cover pre-welding of the battery usually uses a spot welding device to apply a short-time current pulse at a certain distance on the contact surface of the welding part, so that the metal at the contact point is heated and melted to form a welding spot, thereby fixing the welding parts together. The advantage of spot welding is fast speed and simple operation, which is suitable for various metal materials and welding part structures. However, spot welding also has the problem of low welding strength, especially the core of the battery has a certain core rebound, which may cause the welding spot to crack, resulting in pre-welding failure, which reduces the assembly accuracy of the cover plate and the shell in the subsequent full welding process, causing the full welding to be poor.

[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 purpose, technical scheme and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the drawings.

[0059] On the one hand, in combination with Figure 1 and Figure 2 shown, the present embodiment provides a laser pre-welding device, which comprises a laser welding assembly 1, a first clamp assembly 21 and a second clamp assembly 22.

[0060] The first clamp assembly 21 and the second clamp assembly 22 are arranged oppositely at intervals, and are used to clamp the battery to be welded 100 in the axial direction; the laser welding assembly 1 is located above the battery to be welded 100.

[0061] The laser welding assembly 1 comprises a laser 11 and a galvanometer head 12, the galvanometer head 12 is located at the light emitting end of the laser 11, and is used to guide the laser beam emitted by the laser 11 to the pre-welding point position 10011 of the battery to be welded 100, and to guide the laser beam to move along the extension direction of the welding seam 1001 of the battery to be welded 100 while reciprocally scanning on both sides of the welding seam 1001.

[0062] The laser pre-welding device of the present embodiment uses the first clamp assembly 21 and the second clamp assembly 22 to clamp the battery to be welded 100 from both axial ends, and the laser beam emitted by the laser 11 in the laser welding assembly 1 can use the galvanometer head 12 to guide the laser beam, so as to quickly and accurately pre-weld the pre-welding point position 10011 of the battery to be welded 100, and the pre-welding efficiency of the battery to be welded is higher.

[0063] Moreover, the galvanometer head 12 guides the laser beam to reciprocally scan the weld 1001 along a scanning trajectory, compared with the traditional spot welding, the reciprocally scanning welding has better pre-welding strength, which can ensure the pre-welding quality of the battery 100 to be welded, and further improve the pre-welding quality of the battery 100 to be welded in the subsequent full-welding process.

[0064] In some possible implementation manners, the laser welding assembly 1 is a laser galvanometer welding system, or a galvanometer laser welding machine. Exemplarily, the galvanometer head 12 is composed of two scanning galvanometers, a focusing mirror and a corresponding control system.

[0065] The two scanning galvanometers are respectively responsible for deflecting the laser beam in the X-axis and Y-axis directions, and the focusing mirror is used for focusing the deflected laser beam on the welding point. The control system calculates the angle of swing according to 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 result to the control system, so as to realize accurate control of the swing angle of the galvanometer through closed-loop feedback control.

[0066] Reference 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 position of the battery 100 to be welded. The scanning range can cover a group of batteries 100 to be welded, or can 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.

[0067] Exemplarily, the laser welding assembly 1 further includes a gantry 13, and the laser 11 and the galvanometer head 12 are connected to the gantry 13. The gantry 13 can drive the laser 11 and the galvanometer head 12 to move in space, so that more batteries 100 to be welded can be covered by using the same laser 11 and galvanometer head 12, the activity range of the laser welding assembly 1 is increased, and thus the number of laser welding assemblies 1 used is reduced, and the equipment cost of the laser pre-welding device is reduced.

[0068] In some possible implementation manners, as shown in Figure 1 The laser pre-welding device further includes a dust removal assembly 4, which is respectively communicated to the vicinity of each first clamp assembly 21 and second clamp assembly 22. The dust removal assembly 4 can use negative pressure to suck away the smoke and dust generated in the laser pre-welding process.

[0069] In some possible implementation manners, as shown in Figure 6 and Figure 7As shown, the battery to be welded 100 includes a cylindrical shell, an electric core, a first battery cover plate 1002 and a second battery cover plate 1003, both ends of the shell are open, the electric core is located in the shell, and the first battery cover plate 1002 and the second battery cover plate 1003 are respectively covered on both ends of the shell. The positive electrode of the electric core 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 electric core is electrically connected to the other of the first battery cover plate 1002 and the second battery cover plate 1003.

[0070] 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 compresses the first battery cover plate 1002 on one end of the shell along the axial direction, and the second clamp assembly 22 compresses the second battery cover plate 1003 on the other end of the shell in the opposite direction, 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.

[0071] Among them, between the first battery cover plate 1002 and the shell, between the second battery cover plate 1003 and the shell, there are two weld seams 1001 respectively, and at least one pre-welding point 10011 can be arranged on each weld seam 1001. The first battery cover plate 1002 and the shell can be pre-welded together by using the pre-welding point 10011, and the second battery cover plate 1003 and the shell can be pre-welded together.

[0072] Exemplarily, the battery to be welded 100 is a cylindrical battery, the shell is a cylindrical shell, the first battery cover plate 1002 and the second battery cover plate 1003 are both circular plates, and the two weld seams 1001 formed after the preliminary assembly of the shell, the first battery cover plate 1002 and the second battery cover plate 1003 are both annular weld seams 1001. There can be one, two or three circumferentially spaced pre-welding points 10011 on the annular weld seam 1001. All pre-welding points 10011 can be uniformly spaced on the annular weld seam 1001, or can be non-uniformly spaced on the annular weld seam 1001.

[0073] The interval angle between adjacent pre-welding points 10011 can be 30°, 60°, 90°, 180°, etc.

[0074] It should be noted that the shape of the shell can also be elliptical or racetrack-shaped.

[0075] For example, one of the first battery cover 1002 and the second battery cover 1003 corresponds to the positive electrode of the battery 100 to be welded, and the other of the first battery cover 1002 and the second battery cover 1003 corresponds to the negative electrode of the battery 100 to be welded. For example, one of the first battery cover 1002 and the second battery cover 1003 is provided with a liquid injection hole, and the other of the first battery cover 1002 and the second battery cover 1003 is provided with an explosion-proof valve.

[0076] 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 sine trajectory, and a wavy trajectory.

[0077] In this embodiment, when the scanning trajectory of the laser beam at the pre-welding point 10011 is as described above, the laser beam can pass through the weld 1001 multiple times, and both the welding area and strength can be improved.

[0078] Combination Figure 5 As shown, in some embodiments, when the laser beam reciprocates across both sides of the weld 1001, the laser energy of the laser 11 is inversely proportional to the scanning trajectory and the distance a between the weld 1001.

[0079] In this embodiment, when the laser beam performs reciprocating scanning, it needs to turn away from the weld 1001 after scanning to a sufficient distance, moving towards the other side of the weld 1001. At the turning point, the laser beam's energy accumulates. Considering the limited thickness of the battery casing 100 to be welded, if the accumulated laser beam energy at the turning point is too large, it may cause the casing to burn through. Therefore, as the distance between the scanning trajectory and the weld 1001 continuously increases, the laser beam's energy continuously decreases. When the distance between the scanning trajectory and the weld 1001 is at its maximum, the laser beam's energy is at its minimum (e.g., 40%). At this point, the laser beam turns without significant energy accumulation. Conversely, as the distance between the scanning trajectory and the weld 1001 continuously decreases, the laser beam's energy continuously increases until the distance between the scanning trajectory and the weld 1001 decreases to zero, at which point the laser beam's energy is at its maximum (e.g., 80%), sufficient for laser welding of the weld 1001.

[0080] refer to Figure 5 As shown, the horizontal axis is the distance 'a' between the scanning trajectory and weld 1001, and the vertical axis is the percentage of laser energy of laser 11. When the horizontal axis is 0, it means that the scanning trajectory coincides with weld 1001. When the horizontal axis is -0.4mm, it means that the scanning trajectory is located on one side of weld 1001. When the horizontal axis is 0.4mm, it means that the scanning trajectory is located on the other side of weld 1001.

[0081] Exemplarily, the width of the weld joint 1001 is 0.2mm, and the laser energy of the laser 11 within the range of ±0.2mm is set to the highest level.

[0082] In combination Figure 6 to Figure 9 As shown, in some embodiments, at least one of the first clamp assembly 21 and the second clamp assembly 22 comprises a clamp head 23.

[0083] The clamp head 23 comprises a slotted end 231 and a connecting end 232, the slotted end 231 is internally provided with a receiving cavity 2311 for accommodating one end of the battery 100 to be welded, and the sidewall of the slotted end 231 is provided with at least one pre-welding groove 2312, and the 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.

[0084] 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 clamps the end of the battery 100 to be welded in a clamping manner. And the pre-welding point 10011 on the weld joint 1001 of the two 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 point 10011 through the pre-welding groove 2312.

[0085] Exemplarily, the first clamp assembly 21 comprises the clamp head 23, or the second clamp assembly 22 comprises the clamp head 23, and the first clamp assembly 21 and the second clamp assembly 22 can also respectively comprise the clamp head 23.

[0086] Another example is that the number of pre-welding grooves 2312 on each clamp head 23 can be one, two, three, etc. Optionally, the positions of the pre-welding grooves 2312 correspond one-to-one to the number and positions of the pre-welding points 10011 on the battery 100 to be welded.

[0087] In combination Figure 6 As shown, in some embodiments, the inner diameter of the receiving cavity 2311 decreases in the direction from the opening to the bottom, and the size of the bottom of the receiving cavity 2311 is less than or equal to the size of the end face of the battery 100 to be welded.

[0088] By the above arrangement, the accommodating cavity 2311 is formed as a tapered 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 under 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 coaxiality, the battery 100 to be welded is accurately positioned, and the pre-welding precision of the battery 100 to be welded is improved.

[0089] In combination Figure 8 As shown in some embodiments, the bottom of the accommodating cavity 2311 is provided with a clearance groove 2313, 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 area of the end face 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 face of the battery 100 to be welded.

[0090] By the above arrangement, the contact area between the bottom surface of the accommodating cavity 2311 and the end face of the battery 100 to be welded is smaller, so that the adhesion between the bottom surface of the accommodating cavity 2311 and the end face of the battery 100 to be welded can be prevented.

[0091] In addition, in some scenarios, the end face of the battery 100 to be welded can have an outwardly protruding pole head, and the clearance groove 2313 can also be used to accommodate the pole head.

[0092] In combination Figure 8 and Figure 9 As shown in some embodiments, the number of pre-welding grooves 2312 is multiple, and the multiple pre-welding grooves 2312 are arranged on the side wall of the slotted end 231 in a circumferential direction, and each pre-welding groove 2312 corresponds to at least one pre-welding point 10011.

[0093] 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 is connected with 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 are directed upward.

[0094] By the above arrangement, in order to improve the pre-welding strength, each weld 1001 of the to-be-welded battery 100 respectively includes a plurality of pre-welding points 10011, each pre-welding point 10011 corresponds to a pre-welding groove 2312, and the laser welding assembly 1 only welds the pre-welding points 10011 in the pre-welding groove 2312 facing upwards. When the pre-welding points 10011 of the to-be-welded battery 100 facing upwards are welded, the rotating mechanism 24 drives the clamp head 23 to rotate, and the clamp head 23 drives the to-be-welded battery 100 to rotate, so that another pre-welding groove 2312 and the corresponding pre-welding points 10011 face upwards, facilitating the welding of the laser welding assembly 1. The laser welding assembly 1 does not need to frequently adjust its own position, which is conducive to improving the welding efficiency of the laser welding assembly 1.

[0095] In addition, the present embodiment only needs to arrange a set of laser welding assembly 1 upwards, which can reduce the number of laser welding assemblies 1 and reduce the cost of the equipment.

[0096] In some possible implementations, referring to Figure 9 As shown in the figure, the connecting end 232 of the clamp head 23 is used to connect the rotating mechanism 24, and the connecting end 232 has a connecting hole 2321 for connecting the rotating mechanism 24. The rotating mechanism 24 includes but is not limited to a motor, a rotating air cylinder, etc.

[0097] In combination with Figure 10 As shown in the figure, in some embodiments, at least one of the first clamp assembly 21 and the second clamp assembly 22 further includes a tightening mechanism 25, the clamp head 23 is connected with the tightening mechanism 25, and the tightening mechanism 25 is used to provide a clamping force along the axial direction of the to-be-welded battery 100 to the clamp head 23.

[0098] By the above arrangement, the first clamp assembly 21 and the second clamp assembly 22 can respectively utilize the tightening mechanism 25 to move closer to or away from each other, axially clamp the to-be-welded battery 100, or release the to-be-welded battery 100.

[0099] In combination with Figure 10 As shown in the figure, 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, and determine the clamping state of the to-be-welded battery 100.

[0100] By the above arrangement, the detection mechanism 26 can 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 a target value, it can be determined that the to-be-welded battery 100 has been clamped in place, and the laser welding assembly 1 can perform a pre-welding program.

[0101] Exemplarily, the detecting mechanism 26 can adopt a photoelectric sensor or a displacement sensor.

[0102] In combination Figure 1 As shown in some embodiments, the laser pre-welding device further comprises a feeding assembly 3 for conveying the battery 100 to be welded between the first clamp assembly 21 and the second clamp assembly 22.

[0103] In order to integrate the laser pre-welding device into the battery production line, the feeding assembly 3 is further provided in the embodiment, which can convey the pre-assembled battery 100 to be welded conveyed by the battery production line 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 for continuous conveying to the next process.

[0104] Exemplarily, the feeding assembly 3 can be a lifting mechanism, a mechanical arm, a shifter, etc.

[0105] On the other hand, the embodiment provides a battery production line comprising the laser pre-welding device of the present application.

[0106] The battery production line of the embodiment adopts the laser pre-welding device of the present application, and has all the beneficial technical effects of all the embodiments herein.

[0107] On the other hand, the embodiment provides a battery, which is pre-welded by the laser pre-welding device of the present application or is processed by the battery production line of the present application.

[0108] The battery of the embodiment is pre-welded by the laser pre-welding device of the present application or is processed by the battery production line of the present application, and has all the beneficial technical effects of all the embodiments herein.

[0109] It should be noted that in the present application, “several”, “at least one” means one or more, “several”, “at least two” means two or more. “And / or” describes the association between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, A and B together, and B alone. The character “ / ” generally represents an “or” relationship between the front and rear associated objects.

[0110] In addition, the terms “first”, “second” are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first”, “second” can explicitly or implicitly include one or more features. In the description of the present application, the meaning of “several” is two or more, unless otherwise specifically limited.

[0111] Unless specifically stated and otherwise apparent from context, "on", "under", and "over" as used herein refer to a relative position of one feature to another where "on" and "under" each indicate that the one feature can be directly in contact with the other feature or can not be in direct contact with the other feature such that there can be an additional feature located in between the one feature and the other feature "on" or "under". Also, "over" indicates that the one feature can be directly on the other feature or can not be directly on the other feature such that there can be an additional feature located in between the one feature and the other feature. Moreover, "over", "above", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. "Under", "below", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0112] In the description of the application, the description of the terms "certain embodiments", "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" means that the particular feature, structure, material or characteristic following the term is included in at least one embodiment or example of the present application.

[0113] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the principle 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 includes: a laser welding assembly (1), a first clamp assembly (21), and a second clamp assembly (22); The first clamping assembly (21) and the second clamping assembly (22) are arranged at intervals opposite to each other, and the first clamping assembly (21) and the second clamping 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; The laser welding assembly (1) includes a laser (11) and a galvanometer (12). The galvanometer (12) is located at the light-emitting 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. While guiding the laser beam to move along the extension direction of the weld (1001) of the battery (100) to be welded, it reciprocates scanning 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 scanning trajectory and the distance a between the weld (1001).

4. The laser pre-welding apparatus according to any one of claims 1 to 3, characterized in that, At least one of the first clamping assembly (21) and the second clamping assembly (22) includes a clamping head (23); The clamp head (23) includes a slotted end (231) and a connecting end (232). The slotted end (231) has a receiving cavity (2311) inside to accommodate 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 the at least one pre-welding groove (2312). 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 receiving cavity (2311) decreases from the opening to the bottom, and the bottom dimension of the receiving cavity (2311) is less than or equal to the end face dimension of the battery to be welded (100).

6. The laser pre-welding apparatus according to claim 5, characterized in that, The bottom of the receiving cavity (2311) is provided with a clearance groove (2313). The projected area of ​​the pre-welding groove (2312) along the axial direction of the battery to be welded (100) is smaller than the end face area of ​​the battery to be welded (100). The pre-welding groove (2312) is used to reduce the contact area between the bottom surface of the receiving cavity (2311) and the end face of the battery to be welded (100).

7. The laser pre-welding device according to claim 4, characterized in that, The number of the pre-welding grooves (2312) is multiple, and the multiple pre-welding grooves (2312) are arranged circumferentially at intervals on the side wall of the slotted end (231). 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 includes a rotating mechanism (24), 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 about the axis of the battery to be welded (100), the clamp head (23) drives the battery to be welded (100) to rotate, so that the different pre-welding grooves (2312) and the corresponding pre-welding points (10011) face upward.

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

9. The laser pre-welding apparatus according to any one of claims 1 to 3, characterized in that, At least one of the first clamping assembly (21) and the second clamping assembly (22) further includes a detection mechanism (26) for detecting the distance between the first clamping assembly (21) and the second clamping assembly (22) to determine the clamping state of the battery to be welded (100).

10. The laser pre-welding apparatus according to any one of claims 1 to 3, characterized in that, The laser pre-welding device further includes a feeding assembly (3) for conveying the battery to be welded (100) between the first clamping assembly (21) and the second clamping assembly (22).

11. A battery production line, characterized in that, The battery production line includes 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 processed using the battery production line described in claim 11.

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