Injection type ultrasonic welding head

Abstract

The utility model discloses an injection type ultrasonic welding head. The injection type ultrasonic welding head comprises a pressing plate, at least one through hole is formed in the pressing plate, the pressing plate is used for limiting a workpiece to be welded, and the pressing plate is provided with a first initial position and a first working position; the welding needle assembly is arranged above the pressing plate and movably connected with the pressing plate, the welding needle assembly comprises at least one welding needle, the welding needle can penetrate through the through hole to weld the workpiece to be welded, and the welding needle assembly is provided with a second initial position and a second working position; one end of the elastic assembly is elastically connected with the pressing plate so that the pressing plate can be switched between the first initial position and the first working position, and / or the other end of the elastic assembly is elastically connected with the welding pin assembly so that the welding pin assembly can be switched between the second initial position and the second working position. By means of the design, the injection type ultrasonic welding head can achieve controllable welding of workpieces, and the welding quality and the product reliability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of ultrasonic welding more specifically, the utility model relates to a kind of injection type ultrasonic welding head. BACKGROUND

[0002] In the field of semiconductor packaging and battery manufacturing, ultrasonic welding technology is widely used in the connection of metal conductors. In particular, in the manufacturing process of lithium batteries, ultrasonic welding is often used to weld metal tabs to the positive and negative poles of the battery. In this process, the design of the ultrasonic welding head directly affects the welding quality and efficiency.

[0003] Existing ultrasonic welding heads usually adopt a whole metal block structure with a specific pattern. However, this design has some technical problems in practical application. The most prominent one is that when using Tape Automated Bonding (TAB) technology, the edge of the weld mark is prone to edge warping during the welding process. This warping tendency can affect the connection stability of the external conductive parts (such as external tabs) of the tab, thereby reducing the conductivity of the battery. In addition, the warped edge of the weld mark is prone to stress concentration, which may cause the weld to crack during battery assembly and use, thereby seriously affecting the reliability and safety of the battery.

[0004] In addition, the traditional welding head structure often produces a large amount of debris during welding. These debris not only affect the welding quality, but also may pose potential safety hazards. The weld mark formed after welding often appears uneven, further increasing the possibility of tab short circuit.

[0005] These problems seriously restrict the promotion and application of ultrasonic welding technology in high-precision and high-reliability application scenarios. Therefore, there is an urgent need in the prior art for a new ultrasonic welding head design that can effectively solve the problem of weld mark edge warping, reduce welding debris, and ensure the flatness of the weld mark, thereby improving the welding quality and product reliability. SUMMARY

[0006] To solve at least one or more of the above-mentioned technical problems, the utility model provides an injection type ultrasonic welding head scheme.

[0007] Specifically, the utility model provides an injection type ultrasonic welding head, comprising:

[0008] a pressing plate, at least one through hole is provided on the pressing plate, the pressing plate is used to limit the workpiece to be welded, and the pressing plate has a first initial position and a first working position;

[0009] A welding needle assembly is arranged above the pressing plate and is movably connected to the pressing plate, wherein the welding needle assembly comprises at least one welding needle which can pass through the through hole to weld the workpiece to be welded, and the welding needle assembly has a second initial position and a second working position;

[0010] An elastic assembly is elastically connected to the pressing plate at one end to switch the pressing plate between the first initial position and the first working position, wherein the first initial position is the position of the pressing plate when the workpiece to be welded is not positioned, and the first working position is the position of the pressing plate when the workpiece to be welded is positioned; and / or,

[0011] The other end of the elastic assembly is elastically connected to the welding needle assembly to switch the welding needle assembly between the second initial position and the second working position, wherein the second initial position is the position of the welding needle when the welding needle does not move relative to the through hole, and the second working position is the position of the welding needle when the welding needle moves relative to the through hole.

[0012] In some embodiments, the elastic assembly is elastically connected between the welding needle assembly and the pressing plate to switch the pressing plate between the first initial position and the first working position, and to switch the welding needle assembly between the second initial position and the second working position;

[0013] When the welding needle assembly is subjected to a downward pressure, the elastic assembly generates a compression elastic force, the welding needle assembly and the pressing plate move towards each other, the welding needle extends from the through hole, so that the welding needle welds the workpiece to be welded;

[0014] When the downward pressure on the welding needle assembly is removed or the welding needle assembly is subjected to an upward tension, the elastic assembly has an elastic recovery force or a tensile elastic force, the welding needle assembly and the pressing plate move away from each other, the welding needle retracts from the through hole, so that the welding needle stops welding the workpiece to be welded.

[0015] In some embodiments, a support plate is arranged above the pressing plate, the elastic assembly is elastically connected between the support plate and the welding needle assembly, or the elastic assembly is elastically connected between the support plate and the pressing plate, so that the welding needle assembly and the pressing plate can move relative to each other, so that the welding needle of the welding needle assembly extends from the through hole.

[0016] In some embodiments, a plurality of welding needles are arranged in an array.

[0017] In some embodiments, the end of the welding needle is provided with a pattern for welding.

[0018] In some embodiments, the lower surface of the pressing plate is a flat surface for pressing the workpiece to be welded during the welding process.

[0019] In some embodiments, a cleaning assembly is further included, which comprises at least one suction head, and the suction head is connected to the pressing plate for absorbing the debris generated during the welding of the pin assembly.

[0020] In some embodiments, a plurality of the suction heads are arranged circumferentially along the pressing plate, the pressing plate has a cavity, and the suction head communicates with the through hole through the cavity to absorb the debris generated during the welding.

[0021] In some embodiments, a pressing plate mounting member is further included, which is fixedly connected to the pressing plate, and the pressing plate mounting member and / or the pressing plate form a cavity, and the suction head communicates with the through hole through the cavity to absorb the debris generated during the welding.

[0022] In some embodiments, the elastic assembly comprises a spring.

[0023] By the injection type ultrasonic welding head provided as above, the combination of the pressing plate, the pin assembly and the elastic assembly can achieve the following technical effects: the pressing plate can be switched between the first initial position and the first working position to effectively limit the workpiece to be welded; the pin assembly can be switched between the second initial position and the second working position to make the pin and the through hole relatively move, thereby realizing the controllable welding of the workpiece to be welded. Further, in some embodiments, the elastic assembly is elastically connected to the pin assembly and the pressing plate at the same time, when the pin assembly is subjected to a downward pressure, the pin assembly and the pressing plate are close to each other, so that the pin is extended from the through hole to weld, when the pressure is removed or subjected to an upward tension, the pin assembly and the pressing plate are away from each other, so that the pin is retracted into the through hole, thereby realizing the function of injection type welding. Further, in some embodiments, by arranging the support plate and elastically connecting the elastic assembly between the support plate and the pin assembly, or between the support plate and the pressing plate, the relative movement between the pin assembly and the pressing plate can be realized, thereby more flexibly controlling the welding process.

[0024] Further, by arranging the plurality of welding pins in an array, welding efficiency can be improved; by providing welding patterns at the ends of the welding pins, welding strength can be enhanced; by making the lower surface of the pressing plate a flat surface, the workpieces to be welded can be effectively pressed during welding. In addition, the utility model also sets up a cleaning assembly, which can timely absorb the debris generated during welding. Further, by arranging a plurality of suction heads along the circumference of the pressing plate and making the suction heads communicate with the through holes through the cavities of the pressing plate, welding debris can be more comprehensively collected. In some embodiments, by providing a pressing plate mounting member and fixedly connecting it with the pressing plate to form a cavity for communicating the suction heads and the through holes, the collection efficiency of the debris can be further improved. Finally, by using a spring as an elastic component, stable and reliable elastic connection function can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 is a structural schematic view showing an injection type ultrasonic welding head according to the present application;

[0027] Figure 2a is a sectional view showing the injection type ultrasonic welding head according to one embodiment of the present application;

[0028] Figure 2b is a sectional view showing Figure 2a the injection type ultrasonic welding head shown in FIG. 1 performing a welding operation;

[0029] Figure 3a is a sectional view showing the injection type ultrasonic welding head according to another embodiment of the present application;

[0030] Figure 3b is a sectional view showing Figure 3a the injection type ultrasonic welding head shown in FIG. 1 performing a welding operation;

[0031] Figure 4 is a perspective structural schematic view showing the injection type ultrasonic welding head according to an embodiment of the present application;

[0032] Figure 5 is a side view showing the injection type ultrasonic welding head according to an embodiment of the present application;

[0033] Figure 6 is a bottom perspective structural schematic view showing the injection type ultrasonic welding head according to an embodiment of the present application; and

[0034] Figure 7This is a schematic diagram showing the bottom planar structure of an injection ultrasonic welding head according to an embodiment of the present invention. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0036] It should be understood that the terms "comprising" and "including" used in the specification and claims of this utility model indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0037] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0038] As described in the background section of this invention, existing ultrasonic welding heads often face problems such as weld edge warping, excessive welding debris, and electrode short circuits during the welding process, which seriously affect welding quality and product reliability. To solve these problems, this invention proposes an innovative injection-type ultrasonic welding head design. This design mainly includes a pressure plate with a through-hole, a welding needle assembly that can pass through the through-hole, an elastic component for maintaining the initial position, and a suction head system disposed around the pressure plate. This structural design allows the welding needle to extend precisely during welding, while the pressure plate effectively controls the welding area and prevents edge warping. Furthermore, the surrounding suction head system can promptly absorb debris generated during the welding process, further improving welding quality. Through this comprehensive design, this invention effectively solves the main technical problems faced by existing ultrasonic welding heads.

[0039] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0040] Figure 1 This is a schematic diagram showing the structure of the injection ultrasonic welding head 10 according to an embodiment of the present invention. Figure 1As shown, the injection ultrasonic welding head 10 includes a pressure plate 101, a welding needle assembly 103, and an elastic assembly 105. Additionally or optionally, the injection ultrasonic welding head 10 may also include a cleaning assembly (which may include a suction tip 106).

[0041] Specifically, the pressure plate 101 has at least one through hole 102 (shown as an elliptical dashed frame for clarity), which is used to limit the workpiece to be welded. A welding needle assembly 103 is disposed above and movably connected to the pressure plate 101, wherein the welding needle assembly 103 includes at least one welding needle 108 that can pass through the through hole 102 to weld the workpiece. As an example, Figure 1 Below, a welding base 104 is also shown. The surface of the welding base 104 has a knurled (fabric texture) surface, which can grip the lower layer of the workpiece during ultrasonic welding. The end of the welding needle 108 is also provided with a pattern for welding. When the welding needle 108 extends and applies pressure and ultrasonic vibration to the upper layer of the workpiece, the upper layer of the workpiece moves laterally, thereby forming a metallic bond at the interface between the upper and lower layers of the material through molecular activation and recombination of shared electrons. In one feasible embodiment, the lower surface of the pressure plate 101 is a flat surface, used to press the workpiece to be welded during the welding process.

[0042] In some implementations, see Figure 1 One end of the elastic component 105 is elastically connected to the pressure plate 101, allowing the pressure plate 101 to switch between a first initial position and a first working position. The first initial position is the position where the pressure plate 101 is not limiting the workpiece to be welded, and the first working position is the position where the pressure plate 101 limits the workpiece to be welded. The other end of the elastic component 105 is elastically connected to the welding needle assembly 103, allowing the welding needle assembly 103 to switch between a second initial position and a second working position. The second initial position is the position where the welding needle 108 is not moving relative to the through hole 102, and the second working position is the position where the welding needle 108 moves relative to the through hole 102.

[0043] When the welding needle assembly 103 is subjected to downward pressure, the elastic component 105 generates compressive elastic force, and the welding needle assembly 103 and the pressure plate 101 move closer to each other, causing the welding needle 108 to extend out of the through hole 102 for welding; when the downward pressure on the welding needle assembly 103 is removed or when it is subjected to upward tension, the elastic component 105 has elastic restoring force or tensile elastic force, and the welding needle assembly 103 and the pressure plate 101 move away from each other, and the welding needle 108 retracts from the through hole 102.

[0044] Alternatively, in another embodiment, referring to FIG2, a support plate 207 may also be included, which is disposed above the pressure plate 101, and an elastic component 105 is elastically connected between the support plate and the welding needle assembly 103, or elastically connected between the support plate 207 and the pressure plate 101.

[0045] Additionally or optionally, the present invention may further include a cleaning component, which may include at least one suction head 106 connected to the pressure plate 101 for absorbing debris generated during welding of the welding needle assembly 103. In some embodiments, multiple suction heads 106 may be arranged circumferentially along the pressure plate 101. The suction heads 106 communicate with through holes 102 through the cavity of the pressure plate 101 to absorb welding debris.

[0046] use Figure 1 The design of the injection-type ultrasonic welding head 10 shown can effectively prevent weld edge warping, reduce welding debris, and make the weld more even, thereby improving welding quality and product reliability. In addition, the cleaning components effectively enhance the cleanliness of the welding process, further ensuring welding quality.

[0047] Figure 2a This is a cross-sectional view showing an injection ultrasonic welding head 20 according to another embodiment of the present invention, and Figure 2b This is a cross-sectional view showing the injection ultrasonic welding head 20 performing welding. (See image.) Figure 2a As shown, the injection-type ultrasonic welding head 20 includes a pressure plate 101, a welding needle assembly 103, an elastic assembly 105, and a support plate 207. The pressure plate 101 has multiple through holes 102 arranged in an array. As previously described, the pressure plate 101 has a first initial position and a first working position. (Combined...) Figure 2a As shown, when the pressure plate 101 is in the first initial position, there is a gap between it and the workpiece to be welded; when the pressure plate 101 moves down to the first working position (as shown in the figure), there is a gap between it and the workpiece to be welded. Figure 2b (As shown in the image), its flat lower surface can make close contact with the workpiece to be welded, thereby limiting the workpiece's position. (And bonding) Figure 1 Similarly, the welding pin assembly 103 may include a plurality of welding pins 108, which have a second initial position and a second working position: when in the second initial position (e.g. Figure 2a As shown in the diagram, the welding needle 108 retracts into the through hole 102; when the welding needle assembly 103 moves down to the second working position, the welding needle 108 extends out of the through hole 102 and contacts the workpiece to be welded (as shown in the diagram). Figure 2b (As shown in the figure). As can be seen from the details shown in the figure, the end of the welding needle 108 is provided with a specific welding pattern. This pattern design can increase the contact area and friction of the welding interface, making it easier for the workpiece surface material to undergo plastic flow during ultrasonic vibration, thereby promoting molecular activation and improving welding strength and efficiency.

[0048] In this embodiment, the support plate 207 is disposed above the pressure plate 101. An elastic component 105 connects the support plate 207 and the welding needle assembly 103, allowing relative movement between the welding needle assembly 103 and the pressure plate 101. When the welding needle assembly 103 is subjected to downward pressure, the elastic component 105 generates a compressive force, causing the welding needle assembly 103 and the pressure plate 101 to move closer together, thus extending the welding needle 108 from the through hole 102 and enabling the welding needle 108 to weld the workpiece. This design achieves the function of injection welding, enabling more precise control of the welding process.

[0049] The lower surface of the pressure plate 101 is flat, which helps to press the workpiece to be welded firmly during the welding process, preventing the workpiece from moving and thus improving welding accuracy. At the same time, this flat surface design of the pressure plate 101 also helps to prevent the weld edge from warping.

[0050] As can be seen, the design of this utility model achieves controllable movement of the welding needle assembly 103 through the cooperation of the support plate 207 and the elastic component 105. This not only enhances the flexibility of the welding process but also improves welding accuracy. Simultaneously, the flat lower surface of the pressure plate 101 helps to evenly distribute pressure, reducing the risk of weld edge warping. This structural optimization enables the injection ultrasonic welding head 20 to significantly improve product reliability while ensuring welding quality, making it particularly suitable for applications requiring high-precision welding, such as the connection of lithium battery tabs to TAB metal.

[0051] Figure 3a This is a cross-sectional view showing an injection ultrasonic welding head 30 according to another embodiment of the present invention, and Figure 3b This is a cross-sectional view showing the injection ultrasonic welding head 30 performing welding. (See image below.) Figure 3a As shown, the injection ultrasonic welding head 30 includes a support plate 207, a pressure plate 101 (not shown in the figure, but located below the welding needle 108), a welding needle 108, an elastic component 105 (shown as a spring in the figure), a suction head 106, and a pressure plate mounting component 301. In this embodiment, the position of the elastic component 105 is relative to... Figure 2a and Figure 2b There have been some changes. Although the elastic component 105 is still connected between the support plate 207 and the welding pin assembly 103, its position has changed from... Figure 2a and Figure 2b The edge position in the middle has been moved to Figure 3a and Figure 3b The welding pin assembly 103 is located in the center. This central configuration provides a more uniform pressure distribution, which helps to improve the stability and consistency of the welding process.

[0052] like Figure 3a and Figure 3bAs shown, the pressure plate mounting member 301 serves as a structural component, tightly fitting with the pressure plate 101. The upper part of the pressure plate mounting member 301 may have multiple through holes, corresponding to the through holes 102 on the pressure plate 101, allowing the welding needle 108 to pass through. The side of the pressure plate mounting member 301 is fixedly connected to the pressure plate 101, which can be achieved through welding, bolting, or other suitable fixing methods. In some embodiments, the pressure plate mounting member 301 may be integrally formed with the pressure plate 101, serving as a side extension of the pressure plate 101. The pressure plate mounting member 301 and the pressure plate 101 together form a closed cavity 302, which plays a crucial role in the collection and handling of debris.

[0053] The suction head 106, as part of the cleaning component, is... Figure 3a and Figure 3b The structure is flared and connected to the side of the pressure plate mounting 301, i.e., the periphery of the pressure plate 101. In some applications, multiple suction heads 106 can be arranged circumferentially along the pressure plate 101. The pressure plate 101 has a cavity 302, which is connected to the annular gap of the through hole 102. During the welding process, since the diameter of the through hole 102 is slightly larger than the diameter of the welding needle 108, an annular gap is formed between the welding needle 108 and the through hole 102. When the welding needle 108 is in the second working position (e.g.) Figure 3b As shown in the diagram, although the welding needle 108 extends into the through hole 102, the annular gap still exists, allowing the suction head 106 to communicate with the annular gap through the cavity 302, thereby promptly absorbing welding debris. When the welding needle 108 retracts to the second initial position (as shown in the diagram), Figure 3a As shown in the diagram, the increased communication area between the cavity 302 and the through-hole 102 allows for more thorough absorption of residual debris. It can be seen that the trumpet-shaped design of the suction head 106 increases the absorption area and improves the efficiency of debris collection.

[0054] Figure 3a and Figure 3b The improved structural design shown provides a more uniform pressure distribution through the central configuration of the elastic component 105, while the design of the pressure plate mount 301 enhances the overall structural stability. The cooperation between the suction head 106 and the cavity 302 significantly improves the cleanliness of the welding process and reduces the impact of debris on the weld quality. The material and structural design of the pressure plate mount 301 also takes into account heat resistance and wear resistance to adapt to frequent welding operations and possible high-temperature environments. Furthermore, the injection ultrasonic welding head 30 designed in this invention not only maintains the advantages of injection welding, but also further improves the accuracy, consistency, and reliability of welding through the optimized configuration of each component, making it particularly suitable for applications requiring high-precision welding, such as the connection of lithium battery tabs to TAB metal.

[0055] Figure 4 This is a three-dimensional structural schematic diagram of an injection ultrasonic welding head according to an embodiment of the present invention. Figure 4 As shown in the figure, the overall design of the welding head includes a rectangular main body structure. A protruding rectangular mounting block 401 is visible on the upper part of the main body for easy operation and positioning. Multiple vertically arranged welding pins 108 are located on the lower part of the main body, distributed in an array for precise welding operations. A horn-shaped structure, which is a suction head 106, is visible around the pressure plate 101 for collecting debris generated during the welding process. Of particular note is the exposed spring structure observed in the ultrasonic welding head, which is part of the elastic component 105, used to provide appropriate pressure and cushioning to ensure pressure control during the welding process. It can be seen that the injection-type ultrasonic welding head of this invention has a compact and rational overall design, embodying the integration of efficient welding, pressure regulation, and debris management functions.

[0056] Figure 5 This is a side view showing an injection ultrasonic welding head according to an embodiment of the present invention, further illustrating its internal structure. The layered design of the welding needle assembly 103 is clearly visible from this angle. The top rectangular structure is part of the welding needle assembly 103, on which a protruding rectangular mounting block 401 is provided. Below the welding needle assembly 103, multiple vertically arranged welding needles 108 can be seen, extending through the pressure plate 101. Between the welding needle assembly 103 and the pressure plate 101, spring structures (i.e., an elastic component 105) on both sides can be observed, providing appropriate pressure and cushioning. The larger rectangular structure at the bottom is the pressure plate mounting member 301, with an elongated opening in its middle portion providing a channel connected to the cavity 302 and the suction head 106 for debris collection.

[0057] Figure 6 This is a three-dimensional structural diagram of the bottom of the injection-type ultrasonic welding head of this utility model. As shown in the figure, the bottom of the welding head is rectangular, and its lower surface is provided with multiple circular through holes 102. These through holes 102 are arranged in an array for the welding needle 108 to extend out. On one side of the welding needle assembly 103, a trumpet-shaped structure, namely the suction head 106, is visible, which is used to collect the debris generated during the welding process. Figure 7 This is a schematic diagram of the bottom planar structure of the injection-type ultrasonic welding head of this utility model. The diagram clearly shows the structural details of the bottom of the ultrasonic welding head. Specifically, the pressure plate 101 at the bottom of the welding head is rectangular and has multiple circular through holes 102. These through holes 102 are evenly distributed, forming a regular array. The end of the welding needle 108 is visible in each through hole 102, exhibiting a slightly convex state. Each end of the pressure plate 101 has a rectangular protrusion structure for positioning or fixing the elastic component 105, such as a spring.

[0058] While various embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An injection-type ultrasonic welding head, characterized in that, include: A pressure plate, wherein the pressure plate is provided with at least one through hole, the pressure plate is used to limit the workpiece to be welded, and the pressure plate has a first initial position and a first working position; A welding needle assembly is disposed above and movably connected to the pressure plate, wherein the welding needle assembly includes at least one welding needle that can pass through the through hole to weld the workpiece to be welded, and the welding needle assembly has a second initial position and a second working position. An elastic component, one end of which is elastically connected to the pressure plate to allow the pressure plate to switch between a first initial position and a first working position. The first initial position is the position where the pressure plate is not limiting the workpiece to be welded, and the first working position is the position where the pressure plate limits the workpiece to be welded; and / or... The other end of the elastic component is elastically connected to the welding needle assembly so that the welding needle assembly can switch between the second initial position and the second working position. The second initial position is the position when the welding needle does not move relative to the through hole, and the second working position is the position when the welding needle moves relative to the through hole.

2. The injection-type ultrasonic welding head according to claim 1, characterized in that, The elastic component is elastically connected between the welding needle assembly and the pressure plate, and is used to switch the pressure plate between the first initial position and the first working position, and to switch the welding needle assembly between the second initial position and the second working position. When the welding needle assembly is subjected to downward pressure, the elastic component generates compressive elastic force, the welding needle assembly and the pressure plate move closer to each other, and the welding needle extends out of the through hole, thereby enabling the welding needle to weld the workpiece to be welded; When the downward pressure on the welding needle assembly is removed or it is subjected to an upward tension, the elastic component has an elastic restoring force or tensile elastic force, the welding needle assembly moves away from the pressure plate, and the welding needle retracts from the through hole, thereby stopping the welding needle from welding the workpiece to be welded.

3. The injection-type ultrasonic welding head according to claim 1, characterized in that, Also includes: A support plate is disposed above the pressure plate. An elastic component is elastically connected between the support plate and the welding needle assembly. Alternatively, the elastic component is elastically connected between the support plate and the pressure plate, allowing the welding needle assembly and the pressure plate to move relative to each other, thereby allowing the welding needle of the welding needle assembly to extend out of the through hole.

4. The injection-type ultrasonic welding head according to claim 1, characterized in that, The multiple welding pins are arranged in an array.

5. The injection-type ultrasonic welding head according to claim 1, characterized in that, The end of the welding needle is provided with a pattern for welding.

6. The injection-type ultrasonic welding head according to claim 1, characterized in that, The lower surface of the pressure plate is a flat surface, used to press the workpiece to be welded during the welding process.

7. The injection-type ultrasonic welding head according to claim 1, characterized in that, It also includes a cleaning component, which includes at least one suction head connected to the pressure plate for absorbing debris generated during the welding of the welding needle assembly.

8. The injection-type ultrasonic welding head according to claim 7, characterized in that, Multiple suction heads are arranged circumferentially along the pressure plate, the pressure plate having a cavity, and the suction heads communicating with the through hole through the cavity to absorb welding debris.

9. The injection-type ultrasonic welding head according to claim 7, characterized in that, It also includes a pressure plate mounting component, which is fixedly connected to the pressure plate. The pressure plate mounting component and / or the pressure plate form a cavity, and the suction head communicates with the through hole through the cavity to absorb welding debris.

10. The injection-type ultrasonic welding head according to any one of claims 1-9, characterized in that, The elastic component includes a spring.

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