Welding ram tool and laser welding device

Abstract

The application provides a welding pressure head tool and a laser welding device, and belongs to the field of battery manufacturing. The welding pressure head tool comprises a pressing plate, an adapter and a nozzle assembly. The pressing plate is provided with a first through hole. The adapter is connected to the pressing plate and is provided with a second through hole. The nozzle assembly is provided with a third through hole. The first through hole, the second through hole and the third through hole are communicated to jointly define a channel for the laser beam to pass through. The nozzle assembly comprises a connecting part and a nozzle body which are sequentially arranged and connected along a first direction. At least one of the adapter and the connecting part is provided with a magnetic body, so that the adapter and the nozzle assembly are magnetically connected. The first direction is consistent with the emission direction of the laser beam. Through the magnetic connection of the adapter and the connecting part, the nozzle assembly can be quickly disassembled and replaced, so that the replacement efficiency of the nozzle assembly can be improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a welding pressure head fixture and a laser welding device. Background Technology

[0002] Currently, in the assembly process of battery cells into battery modules or battery packs in the new energy industry, laser welding is commonly used to connect multiple battery cells in series and / or parallel. The specific welding process is roughly as follows: a busbar is placed on at least two terminals, and then the nozzle assembly of the laser welding equipment is used to press the busbar tightly against the terminals to be connected. After that, the nozzle assembly sprays a laser beam to weld the busbar to the terminals.

[0003] Because battery modules or battery packs come in various specifications and their busbar sizes differ, different nozzle assemblies are required for different busbars. However, changing existing nozzle assemblies is cumbersome and time-consuming. Utility Model Content

[0004] This application aims to at least address one of the technical problems existing in the background art. Therefore, one object of this application is to provide a welding head fixture and laser welding apparatus that can improve the replacement efficiency of nozzle assemblies.

[0005] An embodiment of the first aspect of this application provides a welding pressure head fixture for a laser welding apparatus, comprising: a pressure plate, an adapter, and a nozzle assembly. The pressure plate has a first through hole that penetrates the pressure plate along a first direction; the first direction is configured to be consistent with the emission direction of a laser beam. The adapter has a second through hole that penetrates the adapter along the first direction; the adapter is connected to the pressure plate. The nozzle assembly has a third through hole that penetrates the nozzle assembly along the first direction. The first through hole, the second through hole, and the third through hole communicate to jointly define a channel for the laser beam to pass through. The nozzle assembly includes a connecting portion and a nozzle body that are sequentially arranged and connected along the first direction. At least one of the adapter and the connecting portion is provided with a magnetic body, such that the adapter and the nozzle assembly are magnetically connected.

[0006] In the technical solution of this application embodiment, by designing the adapter and the connecting part to be magnetically connected, the nozzle assembly can be quickly disassembled and assembled, thereby improving the replacement efficiency of the nozzle assembly.

[0007] In some embodiments, at least one of the downstream end of the adapter in the first direction and the end of the connector facing away from the nozzle body is provided with a receiving portion for accommodating a magnetic body. This facilitates reliable magnetic attraction between the connector and the adapter.

[0008] In some embodiments, the receiving portion is an opening, and the magnetic body is engaged or press-fitted into the opening. This embodiment ensures that the magnetic body is securely installed in the opening or pressed into it with an interference fit, reducing the risk of the magnetic body becoming loose.

[0009] In some embodiments, at least one of the downstream end of the adapter in the first direction and the end of the connector facing away from the nozzle body is provided with a plurality of openings spaced around the second through hole. This embodiment increases the number of magnetic bodies, thereby enhancing the magnetic attraction force.

[0010] In some embodiments, the receiving portion is an annular groove, which surrounds the outer periphery of the second through hole. By designing the receiving portion as an annular groove, in the technical solution where the magnetic body has an annular structure, the annular magnetic bodies are connected end to end to form a closed-loop magnetic field, which makes the magnetic attraction force between the connecting portion and the transition portion evenly distributed.

[0011] In some embodiments, both the adapter and the connecting portion are provided with magnetic bodies, with the magnetic bodies on the adapter and the connecting portion arranged opposite to each other. This embodiment ensures a one-to-one correspondence between the magnetic bodies on the adapter and the connecting portion, allowing each magnetic body on the adapter and each magnetic body on the connecting portion to automatically attract and align under magnetic attraction.

[0012] In some embodiments, the adapter has a first positioning surface, and the connecting part has a second positioning surface, with the first positioning surface and the second positioning surface abutting against each other. Utilizing the abutting relationship between the first and second positioning surfaces, the installation position of the nozzle assembly on the adapter can be quickly and accurately positioned.

[0013] In some embodiments, a flange extending toward the nozzle body is provided protruding from the periphery of the second through hole. The flange extends into the third through hole, and the outer peripheral surface of the flange is the first positioning surface; the inner peripheral surface of the connecting part is the second positioning surface. The positioning fit is achieved by the abutting relationship between the outer peripheral surface of the flange and the inner peripheral surface of the connecting part, and the relative displacement between the adapter and the nozzle assembly in a direction perpendicular to the first direction can also be limited to achieve positioning rigidity.

[0014] In some embodiments, the flange protrudes with a protrusion extending toward the nozzle body. The protrusion is a hollow frustum structure, with the end of the hollow frustum structure facing away from the flange being the smaller diameter end. The protrusion serves as a guide during installation, facilitating accurate alignment between the flange and the third through hole.

[0015] In some embodiments, the second through hole includes a first sub-hole and a second sub-hole that are sequentially connected along a first direction. The opening area of ​​the first sub-hole is smaller than the opening area of ​​the second sub-hole. The inner peripheral surface of the second sub-hole is a first positioning surface. The second positioning surface is the outer peripheral surface of the connecting part.

[0016] In some embodiments, the welding pressure head fixture further includes a cover plate, which is fixedly disposed on one side of the pressure plate along a first direction. A through hole is formed in the cover plate, and a connecting portion is inserted into the through hole. The outer peripheral edge of the transition portion overlaps the periphery of the through hole. By introducing the cover plate, it can serve to support the transition portion.

[0017] In some embodiments, the welding pressure head fixture further includes a first elastic element, the two ends of which are elastically connected to the adapter and the pressure plate respectively along the first direction; the orthographic projection of the first elastic element on the end face of the adapter along the first direction falls outside the second through hole.

[0018] In this embodiment, the adapter is elastically connected to the pressure plate through the first elastic member. The adapter and the nozzle assembly magnetically connected to it can float relative to the pressure plate, so as to adaptively adjust the angle of the nozzle assembly according to the top surface of the busbar to be welded. When welding multiple busbars of different thicknesses to the battery terminals, each nozzle assembly can adaptively press the corresponding busbar, which is beneficial to improving the welding quality.

[0019] In some embodiments, the first through hole includes a first hole segment and a second hole segment connected sequentially along a first direction. The opening area of ​​the first hole segment is smaller than the opening area of ​​the second hole segment, and there is a stepped surface between the first hole segment and the second hole segment. The first elastic member and the transition portion are both housed in the second hole segment, and the peripheral side of the transition portion is in contact with the inner surface of the second hole segment.

[0020] In this embodiment, the first elastic element is accommodated in the second hole segment, and the stepped surface provides a reliable support foundation for the first elastic element.

[0021] In some embodiments, the first elastic element is a spring, which is disposed around the outside of the second through hole.

[0022] In some embodiments, the spring is rectangular, and the cross-sectional shape of the first through hole and the transition portion along the direction perpendicular to the first direction is also rectangular. This can limit the displacement of the spring relative to the pressure plate in the direction perpendicular to the first direction during welding, reducing the probability of spring deflection or slippage, thereby improving welding quality.

[0023] In some embodiments, the nozzle assembly further includes a telescopic structure, which is movably connected to the nozzle body. The telescopic structure has a first position and a second position. In the first position, the side of the telescopic structure facing away from the pressure plate is coplanar with the side of the nozzle body facing away from the pressure plate. When the telescopic structure switches from the first position to the second position, it moves in the opposite direction of the first direction to approach the pressure plate.

[0024] In this embodiment, the part of the nozzle assembly that abuts against the reinforcing rib of the manifold during the welding process is designed as a telescopic structure, so that the nozzle body can be reliably pressed against the manifold.

[0025] In some embodiments, the telescopic structure is a U-shaped member, and the sidewall of the nozzle body is inserted into the U-shaped member. Compared with technical solutions where the telescopic structure is a thin plate structure, in this embodiment, the sidewall of the nozzle body is inserted into the U-shaped member, and the space inside the U-shaped member can be equivalent to a track, which can guide the U-shaped member to move in the first direction and reduce the risk of deviation or torsion during the telescopic process of the U-shaped member.

[0026] In some embodiments, the nozzle assembly further includes a second elastic element disposed within the U-shaped member. The two ends of the second elastic element along the first direction are elastically connected to the sidewall of the nozzle body and the U-shaped member, respectively. The elastic deformation of the second elastic element allows the telescopic structure to automatically return from the second position to the first position.

[0027] In some embodiments, the U-shaped member includes a first plate and a second plate disposed opposite to each other. The first plate is disposed on the side of the nozzle body facing the inside of the channel, and the second plate is disposed on the side of the nozzle body facing the outside of the channel. A sliding hole is provided on one of the first plate and the second plate, and the sliding hole extends along a first direction. A protrusion is provided on the side wall of the nozzle body, and the protrusion is disposed in the sliding hole and slides in cooperation with the sliding hole. In a first position, the protrusion abuts against the upper end of the sliding hole.

[0028] This allows the U-shaped component to be connected to the nozzle body, and also allows the U-shaped component to move relative to the nozzle body in the first direction or the opposite direction.

[0029] In some embodiments, one of the telescopic structure and the sidewall of the nozzle body is provided with a guide hole, and the other is provided with a guide post that cooperates with the guide hole, the guide post extending along a first direction.

[0030] In this embodiment, the cooperation between the guide hole and the guide post can play a guiding role, so as to guide the telescopic structure to move stably in the first direction or the opposite direction of the first direction during the movement of the telescopic structure relative to the nozzle body.

[0031] An embodiment of the second aspect of this application provides a laser welding apparatus, which includes the welding pressure head fixture described in the above embodiments.

[0032] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0033] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0034] Figure 1 This is an exploded view of the welding pressure head tooling of some embodiments of this application;

[0035] Figure 2 for Figure 1 A cross-sectional schematic diagram of the welding pressure head fixture shown;

[0036] Figure 3 for Figure 1 The diagram shows the structure of the transition section in the welding head tooling.

[0037] Figure 4 for Figure 1 The diagram shows the structure of the nozzle assembly in the welding head fixture.

[0038] Figure 5 This is an exploded view of the nozzle assembly and adapter from a first perspective, representing some other embodiments of this application.

[0039] Figure 6 for Figure 5 The nozzle assembly and adapter shown are exploded views from a second perspective.

[0040] Figure 7 for Figure 6 A cross-sectional schematic diagram showing the nozzle assembly and adapter mating;

[0041] Figure 8 for Figure 3 A cross-sectional schematic diagram of the adapter shown;

[0042] Figure 9 for Figure 8 A magnified view of a section at point A in the middle;

[0043] Figure 10 This is an exploded view of the welding pressure head tooling of some other embodiments of this application;

[0044] Figure 11 for Figure 10 A cross-sectional schematic diagram of the welding pressure head fixture shown;

[0045] Figure 12 This is a schematic diagram of the structure of the pressure plate in some embodiments of this application;

[0046] Figure 13 for Figure 10 An exploded view of the nozzle assembly and adapter in the welding pressure head tooling shown;

[0047] Figure 14 This is a schematic diagram of the structure of the nozzle assembly and adapter in some embodiments of this application.

[0048] Explanation of reference numerals in the attached figures:

[0049] Welding pressure head fixture 100;

[0050] Pressure plate 10, first through hole 11, first hole section 111, second hole section 112, stepped surface 113;

[0051] Adapter 20, second through hole 21, first sub-hole 211, second sub-hole 212, stepped surface 213, flange 22, first positioning surface 221, protrusion 23, first end face 24;

[0052] Nozzle assembly 30, connecting part 31, second positioning surface 311, second end face 312, nozzle body 32, guide hole 321, protrusion 322, third through hole 33;

[0053] Receiving part 40, opening 40a, annular groove 40b;

[0054] First elastic element 50;

[0055] Cover plate 60, through hole 61;

[0056] Telescopic structure 70, first plate 71, second plate 72, sliding hole 73, guide post 74;

[0057] Second elastic element 80;

[0058] Magnetic material 90. Detailed Implementation

[0059] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0060] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0061] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0062] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0063] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0064] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0065] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0066] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components.

[0067] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0068] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0069] Traditionally, the welding between the busbar of the battery module and the battery terminals is usually achieved using lasers. During the welding process, a nozzle assembly is typically used. This serves two purposes: firstly, it presses the busbar and terminals together to prevent gaps that could lead to incomplete welds; secondly, the nozzle assembly removes weld slag generated during the welding process, ensuring a good weld finish. The busbar is also known as an aluminum busbar, motherboard, or ferrule.

[0070] In related technologies, multiple nozzle assemblies are mounted on the same pressure plate, enabling simultaneous welding of terminals and busbars of multiple batteries, thus improving the assembly efficiency of the battery module. Each nozzle assembly is screwed to the pressure plate with multiple screws. For example, a nozzle assembly may be screwed to the pressure plate with four screws evenly distributed around its perimeter.

[0071] There are many types and specifications of battery modules, and correspondingly, the busbar sizes also vary. To accommodate different busbar sizes, the nozzle assembly needs to be replaced during actual production. Specifically, operators must unscrew the four screws corresponding to each nozzle assembly one by one, and then install the replaced nozzle assembly onto the pressure plate using the four screws. This process is cumbersome and time-consuming, impacting production efficiency.

[0072] Based on the above considerations, in order to solve the problems of cumbersome, time-consuming, and labor-intensive nozzle assembly changeover operations, a welding pressure head fixture was designed. This fixture magnetically connects the adapter and the nozzle assembly. Using this welding pressure head fixture, when it is necessary to change the nozzle assembly model or maintain the nozzle assembly, the nozzle assembly can be disassembled from the adapter without tightening screws, enabling quick nozzle assembly replacement.

[0073] The welding pressure head fixture of this application embodiment is applied to a laser welding apparatus. The laser welding apparatus using the welding pressure head fixture as the welding implementation component in this application embodiment is not limited to welding busbars and terminals; it can also be used to implement manufacturing processes for other battery sections, such as welding battery end caps and casings.

[0074] The battery cell described in this application may include a casing, an electrode assembly, an electrolyte, and an end cap. The electrode assembly is the component in the battery cell where the electrochemical reaction occurs. The electrode assembly and the electrolyte are housed within the casing. As an example, the electrolyte may be liquid, gel-like, or solid. The end cap closes to the opening of the casing, and the casing and end cap together form a mounting cavity, providing mounting space for components such as the electrode assembly. Functional components such as terminals are provided on the end cap, and the terminals are electrically connected to the electrode assembly for outputting or inputting electrical energy from the battery cell.

[0075] For ease of explanation, the laser welding device provided in this embodiment will be described in the following example of a scenario where the busbar and the electrode are welded together. Other application scenarios are similar and will not be described in detail in this embodiment.

[0076] like Figure 1 and Figure 2 As shown in the figure, this application provides a welding pressure head fixture 100, applied to a laser welding device. The welding pressure head fixture 100 includes a pressure plate 10, an adapter 20, and a nozzle assembly 30. The pressure plate 10 has a first through hole 11, which penetrates the pressure plate 10 along a first direction Z. The adapter 20 has a second through hole 21, which penetrates the adapter 20 along the first direction Z, and the adapter 20 is connected to the pressure plate 10. The nozzle assembly 30 has a third through hole 33, which penetrates the nozzle assembly 30 along the first direction Z. The first direction Z is configured to be consistent with the emission direction of the laser beam, and the first through hole 11, the second through hole 21, and the third through hole 33 are connected to define a channel for the laser beam to pass through.

[0077] The nozzle assembly 30 includes a connecting portion 31 and a nozzle body 32 arranged sequentially and connected along the first direction Z. At least one of the adapter portion 20 and the connecting portion 31 is provided with a magnetic body 90, so that the adapter portion 20 is magnetically connected to the nozzle assembly 30.

[0078] The pressure plate 10 is a physical carrier used to fix the nozzle assembly 30. The pressure plate 10 is connected to the frame of the laser welding device. The pressure plate 10 can be fixed or movable relative to the frame. The adapter 20 is an intermediate structure used to achieve a transitional connection between the pressure plate 10 and the nozzle assembly 30. The nozzle assembly 30 is a component used to guide the transmission path of the laser beam and to press against the workpiece to be welded (e.g., a busbar). The nozzle assembly 30 can be made of a material with a high melting point, high reflectivity, and low absorptivity. For example, the material of the nozzle assembly 30 can be any of gold, silver, copper, ceramics (e.g., alumina, silicon nitride), or alloy materials (e.g., tungsten-molybdenum alloy), ensuring that the nozzle assembly 30 will not be melted by the passing laser beam and can operate stably. The materials of the pressure plate 10 and the adapter 20 are similar to those of the nozzle assembly 30, allowing the laser beam to pass through the pressure plate 10 and the adapter 20 stably as well. The nozzle body 32 has a ring-shaped structure.

[0079] The cross-sectional shape of the first through hole 11, the second through hole 21, and the third through hole 33 along the direction perpendicular to the Z-axis is not limited and can be circular, rectangular, trapezoidal, etc. The pressure plate 10 can have multiple first through holes 11. The number of transition parts 20 and the number of nozzle assemblies 30 are the same as the number of first through holes 11. Each nozzle assembly 30 corresponds to one transition part 20 and one first through hole 11, thus the welding pressure head fixture 100 has multiple nozzle assemblies 30. Using the welding pressure head fixture 100 of this embodiment for welding, it is possible to simultaneously weld one busbar to multiple batteries, or to simultaneously weld each of multiple busbars to a battery, improving welding efficiency. Figure 1 The image shows a welding pressure head fixture 100 with four nozzle assemblies 30 mounted on the pressure plate 10.

[0080] The connecting part 31 and the nozzle body 32 can be integrally formed or assembled and connected by welding, screwing, or other methods. In some embodiments, both the adapter part 20 and the connecting part 31 are provided with a magnetic body 90. In other embodiments, one of the adapter part 20 and the connecting part 31 is provided with a magnetic body 90, and the other is made of a material that can be attracted by magnetism (e.g., iron, nickel, cobalt, or other magnetic metals). In this example, in order to enable the other of the adapter part 20 and the connecting part 31 to stably pass through the laser beam, its inner surface can be provided with a coating. The coating material can be any one of gold, silver, copper, ceramics (e.g., alumina, silicon nitride), alloy materials (e.g., tungsten-molybdenum alloy), etc. Specifically, the magnetic body 90 can be a permanent magnet.

[0081] When welding with the welding head fixture 100 of this embodiment, the nozzle assembly 30 abuts against the surface of the busbar, so that the busbar is pressed against the electrode post. The laser welding equipment emits a laser beam, which is sprayed into the channel along the first direction Z and projected onto the busbar in sequence through the first through hole 11, the second through hole 21 and the third through hole 33. The laser beam penetrates the busbar and transfers energy to the electrode post, causing the contact interface between the busbar and the electrode post to melt.

[0082] In actual production, to adapt to different specifications and models of batteries and busbars, a force opposite to the magnetic attraction direction can be applied to the nozzle assembly 30 to move the nozzle assembly 30 away from the pressure plate 10 until the nozzle assembly 30 separates from the adapter 20. Then, the nozzle assembly 30 adapted to the specifications of the busbar to be welded is moved towards the pressure plate 10, so that the nozzle assembly 30 is magnetically connected to the adapter 20, completing the nozzle assembly 30 replacement. It should be noted that the main differences between different specifications and models of the nozzle assembly 30 lie in the size of the nozzle body 32 and the area of ​​the opening 40a at the exit end of the third through hole 33; the size of the connecting part 31 can remain unchanged.

[0083] In this embodiment, by designing the connecting part 31 of the nozzle assembly 30 to be magnetically connected to the adapter part 20 connected to the pressure plate 10, the nozzle assembly 30 can be quickly disassembled and assembled. This allows the nozzle assembly 30 to be quickly replaced when maintenance or model change is required, improving the replacement efficiency of the nozzle assembly 30 and thus significantly increasing production efficiency.

[0084] This embodiment does not specifically limit the installation position or fixing method of the magnetic body 90, as long as the adapter 20 and the connecting part 31 can be magnetically attracted to each other.

[0085] According to some embodiments of this application, at least one of the downstream end of the adapter 20 in the first direction Z and the end of the connecting portion 31 facing away from the nozzle body 32 may be provided with a receiving portion 40, the receiving portion 40 being used to receive the magnetic body 90, and the magnetic body 90 being fixedly disposed in the receiving portion 40.

[0086] The receiving portion 40 is configured to accommodate at least a portion of the magnetic body 90. As an example, the downstream end of the transition portion 20 is provided with the magnetic body 90, wherein the downstream end of the transition portion 20 in the first direction Z ( Figure 1 The lower end (middle section) of the connector 31 is configured to be magnetically attracted. As an example, the end of the connector 31 facing away from the nozzle body 32 (…) Figure 1 The upper part (middle) is provided with a magnetic body 90, and the adapter part 20 is configured to be attracted by magnetism. As an example, both the adapter part 20 and the connecting part 31 are provided with magnetic bodies 90.

[0087] In this embodiment, the magnetic body 90 provided on the adapter 20 is close to the connecting part 31 / the magnetic body 90 provided on the connecting part 31 is close to the adapter 20, which facilitates the reliable magnetic attraction between the connecting part 31 and the adapter 20.

[0088] The specific implementation of the accommodating part 40 is varied.

[0089] According to some embodiments of this application, such as Figure 3 and Figure 4 As shown, the receiving part 40 can be an opening 40a, and the magnetic body 90 is engaged or interference-fitted with the opening 40a. The shape of the opening 40a is not limited and can be circular, rectangular, elongated, or waist-shaped, etc. The shape of the magnetic body 90 is the same as that of the opening 40a, so that the two can fit together well.

[0090] If the downstream end of the adapter 20 is provided with an opening 40a, optionally, the opening 40a can be provided on the peripheral side of the adapter 20, or, as... Figure 3 As shown, the opening 40a can penetrate the end face of the downstream end of the adapter 20. If the opening 40a is provided at the end of the connecting part 31 facing away from the nozzle body 32, optionally, as... Figure 4 As shown, the opening 40a can be provided through the end face of the connecting part 31 facing away from the nozzle body 32, or the opening 40a can also be provided on the peripheral side of the connecting part 31. In this application, for ease of description, the end face of the downstream end of the adapter 20 is defined as the first end face 24, and the end face of the connecting part 31 facing away from the nozzle body 32 is defined as the second end face 312.

[0091] In this embodiment, the magnetic body 90 is secured in the opening 40a or pressed into the opening 40a by an interference fit, so that the magnetic body 90 is reliably installed and the risk of the magnetic body 90 becoming loose is reduced.

[0092] According to some embodiments of this application, at least one of the downstream end of the adapter 20 in the first direction Z and the end of the connecting portion 31 facing away from the nozzle body 32 may be provided with a plurality of openings 40a spaced apart around the second through hole 21.

[0093] like Figure 3 As shown, the adapter 20 has four openings 40a, which are evenly distributed around the second through hole 21. Of course, in other embodiments, the number of openings 40a can be two, three, five, or more. The shapes and sizes of the individual magnetic bodies 90 can be the same or different.

[0094] On the one hand, this embodiment provides multiple magnetic bodies 90 on the adapter portion 20 and / or the connecting portion 31, increasing the number of magnetic bodies 90 and thus enhancing the magnetic attraction force. On the other hand, this embodiment ensures that the multiple magnetic bodies 90 on the adapter portion 20 and / or the connecting portion 31 are evenly distributed, thereby ensuring a uniform distribution of the magnetic attraction force between the connecting portion 31 and the adapter portion 20. In summary, this facilitates stable adsorption between the connecting portion 31 and the adapter portion 20.

[0095] According to some embodiments of this application, such as Figures 5 to 7 As shown, the receiving portion 40 can also be an annular groove 40b, which surrounds the outer periphery of the second through hole 21.

[0096] In this embodiment, the magnetic body 90 can be an annular structure extending circumferentially along the annular groove 40b. Alternatively, multiple magnetic bodies 90 can be provided within the annular groove 40b, with the multiple magnetic bodies 90 distributed at intervals along the circumferential direction of the annular groove 40b. The magnetic body 90 and the annular groove 40b can be engaged or press-fitted. Alternatively, in some embodiments, the magnetic body 90 can also be bonded and fixed within the annular groove 40b using adhesive.

[0097] The annular groove 40b has a groove depth direction, which refers to the direction in which the annular groove 40b extends to its depth, i.e., the direction perpendicular to the groove bottom and the groove opening. Optionally, the groove depth direction can be parallel to the first direction Z. In this example, the groove opening of the annular groove 40b on the transition portion 20 penetrates the aforementioned first end face 24, such as... Figure 6 and Figure 7 As shown, the annular groove 40b provided on the connecting part 31 penetrates the second end face 312. Alternatively, the groove depth direction can also be perpendicular to the first direction Z. In this example, the opening of the annular groove 40b provided on the transition part 20 penetrates the peripheral side surface of the transition part 20, and the annular groove 40b provided on the connecting part 31 penetrates the peripheral side surface of the connecting part 31.

[0098] By designing the receiving part 40 as an annular groove 40b, in a technical solution where the magnetic body 90 has an annular structure, compared to a technical solution where multiple magnetic bodies 90 are discretely distributed, the annular magnetic bodies 90 connect end to end to form a closed-loop magnetic field. This ensures a uniform distribution of magnetic attraction between the connecting part 31 and the transition part 20. Furthermore, the annular magnetic field has a wide coverage area, allowing the replaced nozzle assembly 30 to be quickly connected to the transition part 20 during installation.

[0099] In some embodiments not shown in the figures, the first end face 24 may be recessed to form a mounting groove, and the peripheral side of the adapter 20 may be provided in a mounting hole. The mounting hole extends to communicate with the mounting groove and together form the aforementioned receiving portion 40. The magnetic body 90 is inserted into the mounting groove through the mounting hole and protrudes from the first end face 24. Similarly, the receiving portion 40 on the connecting portion 31 can also be designed in this manner, and will not be described in detail here.

[0100] According to some embodiments of this application, both the adapter 20 and the connecting part 31 may be provided with a magnetic body 90, and the magnetic body 90 on the adapter 20 and the magnetic body 90 on the connecting part 31 may be arranged opposite to each other.

[0101] In this embodiment, the number of magnetic bodies 90 on the adapter 20 is the same as the number of magnetic bodies 90 on the connecting part 31, and the orthographic projection of each magnetic body 90 on the downstream end face of the adapter 20 coincides with the orthographic projection of a magnetic body 90 on the first end face 24 of the connecting part 31.

[0102] In this embodiment, the magnetic bodies 90 on the adapter 20 correspond one-to-one with the magnetic bodies 90 on the connecting part 31. In this way, each magnetic body 90 on the adapter 20 and each magnetic body 90 on the connecting part 31 can automatically attract and align under the action of magnetic attraction, which is beneficial to enable the adapter 20 and the connecting part 31 to be precisely matched.

[0103] In embodiments where the magnetic body 90 on the adapter 20 is exposed on the first end face 24 and / or the magnetic body 90 on the connecting part 31 is exposed on the second end face 312, the magnetic properties of the magnetic body 90 are less blocked due to the exposure of the magnetic body 90, which can promote a greater magnetic attraction force, thereby facilitating a reliable magnetic connection between the adapter 20 and the nozzle assembly 30.

[0104] According to some embodiments of this application, the adapter 20 may have a first positioning surface 221, and the connecting part 31 may have a second positioning surface 311, with the first positioning surface 221 and the second positioning surface 311 abutting and cooperating.

[0105] The first positioning surface 221 refers to a specific contact surface on the adapter 20 that can be precisely aligned with the connecting part 31 during assembly. Similarly, the second positioning surface 311 refers to a specific contact surface on the connecting part 31 that can be precisely aligned with the adapter 20 during assembly.

[0106] This embodiment utilizes the abutting relationship between the first positioning surface 221 and the second positioning surface 311 to quickly and accurately position the nozzle assembly 30 on the adapter 20. This balances the convenience of magnetic connection with the reliability of mechanical positioning.

[0107] The specific implementation methods for the positioning cooperation between the first positioning surface 221 and the second positioning surface 311 are diverse.

[0108] According to some embodiments of this application, such as Figure 2 , Figure 8 and Figure 9 As shown, the periphery of the second through hole 21 may be provided with a flange 22 extending toward the nozzle body 32, and the flange 22 extends into the third through hole 33. In this example, the outer peripheral surface of the flange 22 can be the first positioning surface 221, and the inner peripheral surface of the connecting part 31 can be the second positioning surface 311.

[0109] In this embodiment, when reconnecting the nozzle assembly 30 after maintenance or replacement to the adapter 20, the nozzle assembly 30 can be moved so that the flange 22 is approximately aligned with the third through hole 33, and then the nozzle assembly 30 can be moved closer to the adapter 20 until the nozzle assembly 30 and the adapter 20 are magnetically attracted to each other. The nozzle assembly 30 is then moved closer to the adapter 20, and the flange 22 is gradually inserted into the third through hole 33. The first positioning surface 221 and the second positioning surface 311 are in contact, and the nozzle assembly 30 moves under the action of force and magnetic attraction until it is magnetically connected to the adapter 20.

[0110] This embodiment utilizes the abutting relationship between the outer peripheral surface of the flange 22 and the inner peripheral surface of the connecting part 31, which not only serves a positioning function to facilitate the accurate installation position of the nozzle assembly 30, but also restricts the relative displacement of the adapter part 20 and the nozzle assembly 30 in the direction perpendicular to the Z-axis, thereby achieving positioning rigidity.

[0111] According to some embodiments of this application, further, such as Figure 8 and Figure 9 As shown, the flange 22 may also have a protrusion 23 extending toward the nozzle body 32. The protrusion 23 is a hollow frustum structure, with the end of the hollow frustum structure facing away from the flange 22 being the smaller diameter end. The outer peripheral surface of the protrusion 23 is an annular conical surface, and the distance between the annular conical surface and the inner peripheral surface of the connecting part 31 gradually increases along the first direction Z.

[0112] In this embodiment, by introducing a hollow frustum-shaped protrusion 23, when the nozzle assembly 30 is reconnected to the adapter 20 after maintenance or replacement, the protrusion 23 can act as a guide when it is initially inserted into the third through hole 33, so as to facilitate the accurate alignment of the flange 22 and the third through hole 33.

[0113] According to some embodiments of this application, such as Figure 5As shown, the second through hole 21 may specifically include a first sub-hole 211 and a second sub-hole 212 that are sequentially connected along the first direction Z. The opening area 40a of the first sub-hole 211 is smaller than the opening area 40a of the second sub-hole 212. In this example, the inner peripheral surface of the second sub-hole 212 may be the first positioning surface 221, and the second positioning surface 311 may be the outer peripheral surface of the connecting part 31.

[0114] In other words, the second through hole 21 is a stepped hole. When the cross-section of the second through hole 21 is circular at all points, the diameter of the first sub-hole 211 is smaller than the diameter of the second sub-hole 212. Furthermore, the second through hole 21 also includes a stepped surface 213 connecting the first sub-hole 211 and the second sub-hole 212. In the embodiment where the receiving portion 40 is an annular groove 40b, it can be understood that, Figure 5 As shown, the annular groove 40b provided on the transition part 20 can specifically be provided on the stepped surface 213. In this embodiment, the outer diameter of the connecting part 31 of the nozzle assembly 30 of various specifications and models is the same.

[0115] In this embodiment, positioning is achieved by the abutting relationship between the outer peripheral surface of the connecting part 31 and the inner peripheral surface of the second sub-hole 212. In this way, compared with using the inner peripheral surface of the connecting part 31 as the second positioning surface 311, the design of the opening area 40a of the third through hole 33 is not limited by the flange 22.

[0116] Based on some embodiments of this application, please continue to refer to Figure 10 and Figure 11 The welding pressure head fixture 100 may also include a cover plate 60, which is fixedly disposed on one side of the pressure plate 10 along the first direction Z. A through hole 61 is provided on the cover plate 60, the connecting part 31 is inserted into the through hole 61, and the outer peripheral edge of the transition part 20 is stacked on the periphery of the through hole 61.

[0117] Taking the connecting part 31, the through hole 61, and the transition part 20 as having a circular cross-sectional shape perpendicular to the Z-axis as an example, the outer diameter of the connecting part 31 is smaller than the diameter of the through hole 61, and the diameter of the through hole 61 is smaller than the outer diameter of the transition part 20. The cover plate 60 and the pressure plate 10 can be connected by one or more of the following methods: welding, bonding, screwing, and snap-fit. The shape of the through hole 61 is adapted to the cross-sectional shape of the first through hole 11 and the connecting part 31.

[0118] In this embodiment, a cover plate 60 is introduced, which serves to support the adapter 20. In some embodiments, the adapter 20 is disposed in the first through hole 11, and the cover plate 60 can prevent the adapter 20 from passing through the through hole 61, so that the adapter 20 can be stably installed in the first through hole 11.

[0119] In an embodiment where the welding pressure head tooling 100 is further provided with a cover plate 60, the outer peripheral surface of the connecting part 31 can be used as the second positioning surface 311, and the hole wall of the through hole 61 can be used as the first positioning surface 221.

[0120] Based on some embodiments of this application, please continue to refer to Figure 10 and Figure 11 The welding pressure head fixture 100 may further include a first elastic element 50, the two ends of which are elastically connected to the adapter 20 and the pressure plate 10 along the first direction Z. The orthographic projection of the first elastic element 50 along the first direction Z onto the end face of the adapter 20 falls outside the second through hole 21, that is, the laser path of the first elastic element 50 does not coincide with that of the laser beam entering the second through hole 21, so the laser beam will not be projected onto the first elastic element 50. The two ends of the first elastic element 50 may be fixedly connected to the adapter 20 and the pressure plate 10 by welding, riveting, bonding, etc., or the two ends of the first elastic element 50 may also elastically abut against the adapter 20 and the pressure plate 10.

[0121] In related technologies, when using laser welding to weld busbars and terminals, the busbar is placed on multiple terminals to be connected in series and / or parallel. During the welding process, the nozzle assembly 30 of the laser welding equipment presses the busbar onto the multiple terminals. Due to production tolerances and manufacturing errors, the multiple terminals to be connected in series and / or parallel may have height differences, causing the top surfaces of the multiple terminals to be connected in series and / or parallel to be uneven. This causes the busbar pressed onto the multiple terminals to be connected in series and / or parallel to tilt at an angle to the horizontal plane. Consequently, the contact between the nozzle assembly 30 and the busbar during the actual welding process is point contact or line contact, resulting in a large gap between the nozzle assembly 30 and the busbar. During the welding process, welding slag can easily splash from this gap to outside the nozzle assembly 30 and fall onto the battery cells to be connected in series and parallel, thereby damaging the battery cells to be connected in series and parallel. Alternatively, when using laser welding to weld the terminals and busbars of multiple batteries, the different thicknesses of the busbars will prevent the nozzle assembly 30 from contacting each busbar simultaneously during the actual welding process. In other words, it cannot be compatible with the process of welding multiple busbars of different thicknesses at the same time.

[0122] In this embodiment, the adapter 20 is elastically connected to the pressure plate 10 via a first elastic member 50. Utilizing the elastic deformation capability of the first elastic member 50, the adapter 20 and the nozzle assembly 30 magnetically connected to it can float relative to the pressure plate 10. This allows the angle of the nozzle assembly 30 to adaptively adjust according to the top surface of the busbar to be welded. This enables the nozzle assembly 30 in this embodiment to be compatible with welding processes involving multiple busbars of different thicknesses, or to adaptively adjust to be parallel to an inclined busbar. This improves the contact between each nozzle assembly 30 and the busbar surface, thus enhancing welding quality.

[0123] Furthermore, the nozzle assembly 30 is indirectly connected to the pressure plate 10 through the first elastic member 50. Therefore, during welding, the pressure of the nozzle assembly 30 on the manifold and pole is affected by the elastic deformation force of the first elastic member 50. This can reduce the possibility of the manifold being damaged due to excessive pressure of the nozzle assembly 30 on the manifold.

[0124] According to some embodiments of this application, such as Figure 12 As shown, the first through hole 11 may specifically include a first hole segment 111 and a second hole segment 112 connected sequentially along the first direction Z. The area of ​​the opening 40a of the first hole segment 111 is smaller than the area of ​​the opening 40a of the second hole segment 112, and a stepped surface 113 is provided between the first hole segment 111 and the second hole segment 112. The first elastic member 50 and the transition portion 20 can both be accommodated in the second hole segment 112, and the peripheral side surface of the transition portion 20 is in contact with the inner surface of the second hole segment 112. That is to say, the first through hole 11 is a stepped hole. When the cross-section of the first through hole 11 is circular at all points, the diameter of the first hole segment 111 is smaller than the diameter of the second hole segment 112. One end of the first elastic member 50 is elastically connected to the stepped surface 113.

[0125] In this embodiment, the first elastic element 50 is accommodated in the second hole segment 112 and the stepped surface 113 provides a reliable support foundation for the first elastic element 50.

[0126] As disclosed in this paper, the welding pressure head fixture 100 can have a first elastic element 50, which can be a component with an elastic structure, such as rubber, a spring sheet, etc. Figure 10 and Figure 11 The spring and other components shown are illustrated. According to some embodiments of this application, the first elastic element 50 can be a spring, which is arranged around the second through hole 21. That is, the orthographic projection of the spring on the end face of the adapter 20 facing away from the nozzle assembly 30 surrounds the second through hole 21, and the central axis of the spring can coincide with the central axis of the second through hole 21.

[0127] To prevent the spring from being melted by the laser beam, this embodiment only requires one spring, which helps to reduce assembly complexity, provided that the spring is not located in the exit path of the laser beam.

[0128] Of course, in other embodiments, the springs and the second through hole 21 can be spaced apart in a direction perpendicular to the Z-axis. For example, there can be multiple springs, which are evenly and spaced apart around the axis of the second through hole 21.

[0129] This embodiment does not impose specific limitations on the shape of the spring; for example, it can be circular, square, conical, drum-shaped, etc. According to some embodiments of this application, such as... Figure 11As shown, the spring can be rectangular, and correspondingly, the cross-sectional shape of the first through hole 11 and the adapter 20 along the first direction Z is rectangular.

[0130] In embodiments where the first through hole 11 is a stepped hole, the cross-section of the first through hole 11 can be rectangular. Specifically, the first through hole 11 includes a first hole segment 111 and a second hole segment 112 connected sequentially along the first direction Z. The cross-sections of the first hole segment 111 and the second hole segment 112 along the direction perpendicular to the Z-axis are both rectangular. The external dimensions of the spring housed in the second hole segment 112 and the external dimensions of the transition portion 20 are matched (i.e., substantially equal) with the dimensions of the second hole segment 112. In this application, the term "substantially equal" includes not only absolute equality but also generally recognized as being substantially equal in engineering, specifically meaning that the thickness fluctuation range at each location is within ±2μm, which reduces the precision requirements of the manufacturing equipment.

[0131] In this embodiment, the cross-sections of the first through hole 11, the spring housed in the first through hole 11, and the transition part 20 are all rectangular. The outer dimensions of the spring match the dimensions of the second hole section 112. On the one hand, the hole wall of the second hole section 112 provides a certain degree of support for the spring. On the other hand, it helps to improve the installation accuracy of the spring and can also play a precise limiting role. Specifically, it limits the displacement of the spring relative to the pressure plate 10 in the direction perpendicular to the Z-axis during the welding process, reducing the probability of the spring shifting or sliding, thereby improving the welding quality.

[0132] At the same time, the external dimensions of the adapter 20 match the dimensions of the second hole section 112, which can limit the displacement of the adapter 20 relative to the pressure plate 10 in the direction perpendicular to the Z-axis during the welding process, reduce the probability of the adapter 20 and the nozzle assembly 30 magnetically connected to it shifting or shaking, and help reduce the noise and vibration generated by the collision between the adapter 20 and the pressure plate 10 during the welding process.

[0133] According to some embodiments of this application, such as Figure 1 and Figure 4 As shown, the nozzle assembly 30 may further include a telescopic structure 70, which is movably connected to the nozzle body 32 and disposed on the outer periphery of the nozzle body 32. The telescopic structure 70 has a first position and a second position. In the first position, the side of the telescopic structure 70 facing away from the pressure plate 10 is coplanar with the side of the nozzle body 32 facing away from the pressure plate 10. When the telescopic structure 70 switches from the first position to the second position, it moves in the opposite direction of the first direction Z to approach the pressure plate 10.

[0134] The telescopic structure 70 refers to a component that can move relative to the pressure plate 10 in the Z-axis direction or in the opposite direction of the Z-axis. In the second position, the side of the telescopic structure 70 facing away from the pressure plate 10 is located on the side of the nozzle body 32 facing away from the pressure plate 10.

[0135] Multiple telescopic structures 70 may be provided. For example, such as... Figure 4 As shown, there are two telescopic structures 70, which are arranged on opposite sides of the nozzle body 32 along the second direction X, and the second direction X is perpendicular to the first direction Z.

[0136] Understandably, in related technologies, the busbar has a reinforcing rib protruding from one side along its thickness direction. When the busbar is placed on the terminals of multiple batteries, the reinforcing rib is located on the side of the busbar facing away from the terminals. When the battery to which the terminal to be welded belongs is small, the distance between two adjacent terminals is small, meaning they are close to each other. During the actual welding process, when the nozzle assembly 30 moves to press the busbar onto the multiple terminals, it is prone to interference with the reinforcing rib. This can prevent the nozzle assembly 30 from pressing firmly onto the busbar, resulting in a large gap between the nozzle assembly 30 and the busbar. During welding, weld slag can easily splash from this gap outside the nozzle assembly 30 and fall onto the battery cells to be connected in series and parallel, thereby damaging the battery cells to be connected in series and parallel.

[0137] In this embodiment, the welding pressure head fixture 100 initially has the telescopic structure 70 in a first position. In welding scenarios where the battery to which the terminal to be welded belongs is small and the distance between two adjacent terminals is small, the nozzle assembly 30 moves to approach the busbar. When the telescopic structure 70 interferes with the reinforcing rib, the nozzle assembly 30 continues to move towards the busbar. The telescopic structure 70 is blocked by the reinforcing rib and moves in the opposite direction of the first direction Z to gradually approach the pressure plate 10. The nozzle body 32 continues to move to press the busbar onto the multiple terminals.

[0138] In this embodiment, the part of the nozzle assembly 30 that abuts against the reinforcing rib of the busbar during the welding process is designed as a telescopic structure 70. When the telescopic structure 70 abuts against the reinforcing rib, it can move towards the pressure plate 10. The nozzle body 32 can move normally to press the busbar onto the multiple poles. This ensures that the nozzle body 32 can be reliably pressed against the busbar, thereby reducing the risk of welding slag splashing from between the nozzle body 32 and the busbar to the outside of the nozzle assembly 30 and causing damage to the battery cells.

[0139] The telescopic structure 70 can be a thin plate structure, a block structure, a rod structure, etc. In this example, the telescopic structure 70 can be slidably disposed on the outer side wall of the nozzle body 32 or on the inner side wall of the nozzle body 32.

[0140] According to some embodiments of this application, such as Figure 13 As shown, the telescopic structure 70 can be constructed as a U-shaped component, with the sidewall of the nozzle body 32 inserted into the U-shaped component. The U-shaped component has an open end, from which the sidewall of the nozzle body 32 is inserted into the U-shaped component.

[0141] Compared to technical solutions such as the telescopic structure 70 being a thin plate structure, in this embodiment, the side wall of the nozzle body 32 is inserted into the U-shaped component, and the space inside the U-shaped component can be equivalent to a track. This can guide the U-shaped component to move along the Z-axis or in the opposite direction of the Z-axis, reducing the risk of the U-shaped component shifting or twisting during the telescopic process.

[0142] According to some embodiments of this application, further, such as Figure 13 As shown, the nozzle assembly 30 may further include a second elastic member 80, which is disposed within the U-shaped member. The two ends of the second elastic member 80 along the first direction Z are elastically connected to the side wall of the nozzle body 32 and the U-shaped member, respectively.

[0143] The two ends of the second elastic member 80 can be fixedly connected to the nozzle body 32 and the U-shaped component by welding, riveting, bonding or other means. Alternatively, the two ends of the first elastic member 50 can also elastically abut against the side wall of the nozzle body 32 and the U-shaped component.

[0144] The second elastic element 80 can also be a component with an elastic structure, such as rubber, sheet metal, etc. Figure 13 The spring and other components are shown. Taking the second elastic element 80 as a spring as an example, when the telescopic structure 70 is in the first position, the spring can be in a natural state or in a compressed state. When the telescopic structure 70 is in the second position, the spring is in a compressed state.

[0145] In this embodiment, the welding pressure head fixture 100 is used in welding scenarios where the battery to which the electrode to be welded belongs is small in size and the distance between two adjacent electrodes is small. After welding is completed, the nozzle assembly 30 moves away from the busbar until the telescopic structure 70 no longer abuts against the reinforcing rib of the busbar. Then, the abutting effect of the reinforcing rib on the telescopic structure 70 is removed, and the second elastic member 80 restores its deformation so that the telescopic structure 70 returns to the first position, ready to move when it abuts against the reinforcing rib in the next welding process.

[0146] In this embodiment, by introducing a second elastic element 80, the elastic deformation of the second elastic element 80 enables the telescopic structure 70 to automatically reset from the second position to the first position, so that the welding pressure head tooling 100 can be reused.

[0147] Please refer to some embodiments of this application. Figure 14The U-shaped component may specifically include a first plate 71 and a second plate 72 disposed opposite to each other. The first plate 71 is disposed on the side of the nozzle body 32 facing inward toward the channel, and the second plate 72 is disposed on the side of the nozzle body 32 facing outward toward the channel. A sliding hole 73 is provided on one of the first plate 71 and the second plate 72, and the sliding hole 73 extends along the first direction Z. A protrusion 322 is provided on the side wall of the nozzle body 32, and the protrusion 322 is disposed in the sliding hole 73 and slides in cooperation with the sliding hole 73. In a first position, the protrusion 322 abuts against the upper end of the sliding hole 73.

[0148] When the telescopic structure 70 switches from the first position to the second position, the sliding hole 73 moves in the opposite direction of the Z-axis, and the protrusion 322 gradually approaches the lower end of the sliding hole 73. When the protrusion 322 abuts against the lower end of the sliding hole 73, the telescopic structure 70 can no longer move in the opposite direction of the Z-axis.

[0149] As an example, such as Figure 14 As shown, a sliding hole 73 is provided on the second plate 72, and a protrusion 322 is provided on the outer surface of the side wall of the nozzle body 32. In an example not shown, the sliding hole 73 can also be provided on the first plate 71. The protrusion 322 can be assembled and connected to the side wall of the nozzle body 32 by welding, screwing, bonding, or other methods after the side wall of the nozzle body 32 is inserted into the U-shaped component. The protrusion 322 can be implemented in various ways, such as a column structure, screw, or pin.

[0150] In this embodiment, the U-shaped component is hung on the protrusion 322 of the nozzle body 32, and the protrusion 322 slides with the sliding hole 73 on the U-shaped component. This allows the U-shaped component to be connected to the nozzle body 32, and also allows the U-shaped component to move relative to the nozzle body 32 in the first direction Z or the opposite direction of the first direction Z.

[0151] According to some embodiments of this application, one of the sidewalls of the telescopic structure 70 and the nozzle body 32 is provided with a guide hole 321, and the other is provided with a guide post 74 that cooperates with the guide hole 321, the guide post 74 extending along the first direction Z.

[0152] Taking the telescopic structure 70 as an example, such as Figure 13 As shown, the U-shaped component is provided with a guide post 74, and the side wall of the nozzle body 32 is provided with a guide hole 321. In this example, the guide post 74 can be specifically set inside the U-shaped component, that is, between the first plate 71 and the second plate 72. As an example, the telescopic structure 70 is provided with a guide hole 321, and the side wall of the nozzle body 32 is provided with a guide post 74.

[0153] The guide hole 321 and the guide post 74 work together to guide the telescopic structure 70 to move stably in the first direction Z or the opposite direction of the first direction Z during the movement of the telescopic structure 70 relative to the nozzle body 32.

[0154] An embodiment of the second aspect of this application provides a laser welding apparatus, which includes the welding head fixture 100 described in the above embodiment, with a laser beam output from the channel of the welding head fixture 100. The number of nozzle assemblies 30 can be designed according to requirements and actual working conditions, for example, 20, 50, etc.

[0155] Since the laser welding apparatus uses any of the aforementioned welding head fixtures 100, the beneficial effects of the laser welding apparatus are the same as those of the welding head fixtures 100 described above, and will not be repeated here.

[0156] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0157] A specific embodiment of this application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the scope of this application.

[0158] like Figure 10 and Figure 11 As shown, this application provides a welding pressure head fixture 100 for welding busbars and battery terminals. The welding pressure head fixture 100 includes: a pressure plate 10, an adapter 20, a cover plate 60, a plurality of nozzle assemblies 30, and a square spring.

[0159] The pressure plate 10 has a first through hole 11 extending through its thickness. The first through hole 11 includes a first hole segment 111 and a second hole segment 112 connected in sequence. The cross-section of the first hole segment 111 and the second hole segment 112 in the direction perpendicular to the axis is rectangular. The area of ​​the opening 40a of the first hole segment 111 is smaller than the area of ​​the opening 40a of the second hole segment 112. There is a stepped surface 113 between the first hole segment 111 and the second hole segment 112. The first hole segment 111 is located above the second hole segment 112.

[0160] The adapter 20 has a second through hole 21 extending through it along its own thickness direction. The adapter 20 is accommodated in the second hole section 112. The external dimensions of the adapter 20 are all matched with the dimensions of the second hole section 112.

[0161] A square spring is housed in the second hole section 112. The dimensions of the square spring are matched with the dimensions of the second hole section 112. One end of the square spring elastically abuts against the stepped surface 113, and the other end elastically abuts against the transition part 20.

[0162] A cover plate 60 is disposed on the lower side of the pressure plate 10, and a through hole 61 is formed on the cover plate 60. The through hole 61 is rectangular. The cover plate 60 is fixedly connected to the pressure plate 10 by a screw connection and abuts against the adapter 20. The number of the first through hole 11, the adapter 20 and the through hole 61 are all the same as the number of nozzle assemblies 30.

[0163] The nozzle assembly 30 includes an integrally formed connecting portion 31 and a nozzle body 32. The connecting portion 31 is located above the nozzle body 32 and is in the shape of a hollow prism. The nozzle body 32 is in the shape of a hollow frustum. The large-diameter end of the nozzle body 32 is connected to the connecting portion 31. Both the connecting portion 31 and the nozzle body 32 have rectangular cross-sections. The connecting portion 31 is inserted into a through hole 61. The inner circumferential surfaces of the connecting portion 31 and the nozzle body 32 together form a third through hole 33. Each first through hole 11 is sequentially connected to a second through hole 21 and a third through hole 33 to jointly define a channel for the laser beam to pass through.

[0164] The nozzle assembly 30 also includes two U-shaped components, which are respectively disposed on opposite sides of the nozzle body 32 along a horizontal square. The sidewalls of the nozzle body 32 are inserted into the U-shaped components. Each U-shaped component includes a first plate 71 and a second plate 72 disposed opposite to each other. The first plate 71 is disposed on the side of the nozzle body 32 facing inwards from the channel, and the second plate 72 is disposed on the side of the nozzle body 32 facing outwards from the channel. A sliding hole 73 is provided on the second plate 72. A protrusion 322 is provided on the outer surface of the sidewall of the nozzle body 32, and the protrusion 322 is disposed within and slides in cooperation with the sliding hole 73, allowing the U-shaped component to have a first position and a second position. In the first position, the side of the U-shaped component facing away from the pressure plate 10 is coplanar with the side of the nozzle body 32 facing away from the pressure plate 10. When switching from the first position to the second position, the U-shaped component moves in the opposite direction of the laser beam emission to approach the pressure plate 10. The U-shaped component contains a guide post 74, which extends along the through-hole 11. The nozzle body 32 has a guide hole 321 on its side wall, which engages with the guide post 74. The U-shaped component contains a return spring, which is elastically connected to the side wall of the U-shaped component and the nozzle body 32 at both ends along the through-hole 11.

[0165] In some embodiments, the bottom surface of the adapter 20 and the top surface of the connecting part 31 are provided with four openings 40a, each opening 40a containing a magnetic body 90. The four magnetic bodies 90 on the adapter 20 and the four magnetic bodies 90 on the connecting part 31 correspond one-to-one, so that the adapter 20 and the connecting part 31 are magnetically connected. The periphery of the second through hole 21 is provided with a flange 22 extending toward the nozzle body 32. The flange 22 is provided with a protrusion 23 extending toward the nozzle body 32. The protrusion 23 is a hollow frustum structure. The flange 22 and the protrusion 23 are inserted into the third through hole 33, and the outer peripheral surface of the flange 22 abuts against the inner peripheral surface of the connecting part 31.

[0166] In some embodiments, the second through hole 21 includes a first sub-hole 211 and a second sub-hole 212 connected in sequence. The cross-sections of the first sub-hole 211 and the second sub-hole 212 along a direction perpendicular to the axis are rectangular. The opening area 40a of the first sub-hole 211 is smaller than the opening area 40a of the second sub-hole 212. A stepped surface 213 is provided between the first sub-hole 211 and the second sub-hole 212, with the first sub-hole 211 located above the second sub-hole 212. An annular groove 40b is provided on the stepped surface 213 and the top surface of the connecting portion 31. The annular groove 40b surrounds the second through hole 21, and an annular magnetic body 90 is bonded in each annular groove 40b, so that the transition portion 20 and the connecting portion 31 are magnetically connected. The inner peripheral surface of the second sub-hole 212 abuts against the inner peripheral surface of the connecting portion 31.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 pressure head tooling, characterized in that, The welding pressure head fixture includes: A pressure plate has a first through hole, which penetrates the pressure plate along a first direction; the first direction is configured to be consistent with the emission direction of the laser beam. The adapter has a second through hole that extends through the adapter along the first direction; the adapter is connected to the pressure plate. The nozzle assembly has a third through hole that extends through the nozzle assembly along the first direction; the first through hole, the second through hole and the third through hole are connected to define a channel for the laser beam to pass through; the nozzle assembly includes a connecting portion and a nozzle body that are sequentially arranged and connected along the first direction. At least one of the adapter and the connecting part is provided with a magnetic body, so that the adapter is magnetically connected to the nozzle assembly.

2. The welding pressure head fixture according to claim 1, characterized in that, The adapter has a receiving portion at least one of its downstream end in the first direction and the end of the connector facing away from the nozzle body, the receiving portion being used to accommodate the magnetic body.

3. The welding pressure head fixture according to claim 2, characterized in that, The receiving part is an opening, and the magnetic body is engaged or interference-fitted with the opening.

4. The welding pressure head fixture according to claim 3, characterized in that, At least one of the downstream end of the adapter in the first direction and the end of the connector facing away from the nozzle body is provided with a plurality of openings spaced around the second through hole.

5. The welding pressure head fixture according to claim 2, characterized in that, The receiving portion is an annular groove, which surrounds the outer periphery of the second through hole.

6. The welding pressure head fixture according to any one of claims 1-5, characterized in that, Both the adapter and the connecting part are provided with the magnetic body, and the magnetic body on the adapter and the magnetic body on the connecting part are arranged opposite to each other.

7. The welding pressure head fixture according to any one of claims 1-5, characterized in that, The adapter has a first positioning surface, and the connecting part has a second positioning surface, with the first positioning surface and the second positioning surface engaging in abutment.

8. The welding pressure head fixture according to claim 7, characterized in that, The second through hole has a flange protruding from its periphery and extending toward the nozzle body. The flange extends into the third through hole, and the outer peripheral surface of the flange is the first positioning surface; the inner peripheral surface of the connecting part is the second positioning surface.

9. The welding pressure head fixture according to claim 8, characterized in that, The flange has a protrusion extending toward the nozzle body. The protrusion is a hollow frustum structure, and the end of the hollow frustum structure facing away from the flange is the small diameter end.

10. The welding pressure head fixture according to claim 7, characterized in that, The second through hole includes a first sub-hole and a second sub-hole that are sequentially connected along the first direction. The opening area of ​​the first sub-hole is smaller than the opening area of ​​the second sub-hole. The inner circumferential surface of the second sub-hole is the first positioning surface. The second positioning surface is the outer circumferential surface of the connecting part.

11. The welding pressure head fixture according to claim 7, characterized in that, It also includes a cover plate, which is fixedly disposed on one side of the pressure plate along the first direction. The cover plate has a through hole, the connecting part is inserted into the through hole, and the outer peripheral edge of the transition part overlaps the periphery of the through hole.

12. The welding pressure head fixture according to any one of claims 1-5, characterized in that, It also includes a first elastic element, the two ends of which are elastically connected to the adapter and the pressure plate respectively along the first direction; the orthographic projection of the first elastic element along the first direction onto the end face of the adapter falls outside the second through hole.

13. The welding pressure head fixture according to claim 12, characterized in that, The first through hole includes a first hole segment and a second hole segment connected sequentially along the first direction. The opening area of ​​the first hole segment is smaller than that of the second hole segment. There is a stepped surface between the first hole segment and the second hole segment. The first elastic member and the connecting part are both housed in the second hole segment. The peripheral side of the connecting part is in contact with the inner surface of the second hole segment.

14. The welding pressure head fixture according to claim 13, characterized in that, The first elastic element is a spring, which is arranged around the outside of the second through hole.

15. The welding pressure head fixture according to claim 14, characterized in that, The spring is rectangular, and the first through hole and the transition part are both rectangular in cross-sectional shape along the direction perpendicular to the first direction.

16. The welding pressure head fixture according to any one of claims 1-5, characterized in that, The nozzle assembly further includes a telescopic structure, which is movably connected to the nozzle body. The telescopic structure has a first position and a second position. In the first position, the side of the telescopic structure facing away from the pressure plate is coplanar with the side of the nozzle body facing away from the pressure plate. When the telescopic structure switches from the first position to the second position, it moves in the opposite direction of the first direction to approach the pressure plate.

17. The welding pressure head fixture according to claim 16, characterized in that, The telescopic structure is a U-shaped component, and the side wall of the nozzle body is inserted into the U-shaped component.

18. The welding pressure head fixture according to claim 17, characterized in that, The nozzle assembly further includes a second elastic element disposed within the U-shaped member, and the two ends of the second elastic element along the first direction are elastically connected to the side wall of the nozzle body and the U-shaped member, respectively.

19. The welding pressure head fixture according to claim 17, characterized in that, The U-shaped component includes a first plate and a second plate disposed opposite to each other. The first plate is disposed on the side of the nozzle body facing the inside of the channel, and the second plate is disposed on the side of the nozzle body facing the outside of the channel. A sliding hole is formed on one of the first plate and the second plate, and the sliding hole extends along the first direction. A protrusion is provided on the side wall of the nozzle body. The protrusion is disposed in the sliding hole and slides in cooperation with the sliding hole. In the first position, the protrusion abuts against the upper end of the sliding hole.

20. The welding pressure head fixture according to claim 16, characterized in that, One of the telescopic structure and the sidewall of the nozzle body is provided with a guide hole, and the other is provided with a guide post that cooperates with the guide hole, the guide post extending along the first direction.

21. A laser welding apparatus, characterized in that, Includes the welding pressure head tooling as described in any one of claims 1-20.

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