Ultrasonic welding system and welding seat thereof

Abstract

The utility model relates to an ultrasonic welding system and a welding seat thereof, the welding seat is provided with a working surface, welding teeth, an airflow inlet, an airflow outlet and an airflow channel, the welding teeth are convexly arranged on the working surface, the welding teeth are used for contacting with a workpiece, the airflow inlet is used for receiving airflow, and the airflow outlet is used for receiving airflow. The airflow outlet is used for conveying airflow to the position between the working face and a workpiece, and the airflow channel communicates with the airflow inlet and the airflow outlet. According to the ultrasonic welding device, after welding is completed, positive pressure airflow can be introduced into the airflow inlet, the positive pressure airflow generates thrust on a workpiece, the phenomenon that the workpiece adheres to the welding base is avoided or relieved, then the problem that a tab cracks due to stress is avoided or relieved, and the ultrasonic welding yield is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an ultrasonic welding system and a welding seat thereof. Background Art

[0002] With the rapid development of lithium-ion battery technology, lithium-ion batteries have become mainstream. Lithium-ion batteries are mainly composed of cathodes, anodes, electrolytes, diaphragms, etc. Ultrasonic welding is usually used to weld the tabs and adapters together. The ultrasonic welding system mainly includes a welding seat and a welding head mechanism. The welding seat is used to carry the adapter. The welding head mechanism is mainly composed of a transducer, a horn, and a welding head. The transducer is used to convert electrical energy into high-frequency mechanical vibrations. The welding head converts the high-frequency mechanical vibration energy into friction heat between the tab metal foils to connect the tabs to the adapter.

[0003] As the design capacity of lithium-ion batteries continues to increase, the number of tab layers in single cells increases, and the production line rhythm becomes faster and faster. When the welding seat leaves the adapter, a downward pulling force is generated on the adapter, which is transmitted to the edge of the tab welding and causes cracking of the edge of the tab welding. How to avoid or reduce the problem of sticking between the adapter and the welding seat is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0004] To this end, the utility model provides a welding seat and an ultrasonic welding system which can prevent the adapter and the welding seat from sticking.

[0005] In order to solve the above technical problems, the utility model provides a welding seat of an ultrasonic welding system, wherein the welding seat is provided with a working surface, welding teeth, an air flow inlet, an air flow outlet and an air flow channel, the welding teeth are protrudingly provided on the working surface, the welding teeth are used to contact with a workpiece, the air flow inlet is used to receive air flow, the air flow outlet is used to send air flow between the working surface and the workpiece, and the air flow channel connects the air flow inlet and the air flow outlet.

[0006] Furthermore, the welding seat is provided with a plurality of the air flow outlets, the air flow channel includes an air distribution cavity, the air distribution cavity has a first inner wall parallel to and opposite to the working surface and a second inner wall parallel to and opposite to the first inner wall, and the plurality of air flow outlets are evenly distributed and pass through the working surface and the first inner wall.

[0007] Furthermore, the welding seat is provided with an air flow inlet, and the air flow channel also includes an air inlet channel, the air inlet channel is a cylindrical channel, one axial end of the cylindrical channel passes through the second inner wall, and the air flow inlet passes through the side wall of the cylindrical channel.

[0008] Furthermore, the welding seat is provided with a plurality of welding teeth, and the plurality of welding teeth are evenly distributed on the working surface.

[0009] Furthermore, the welding teeth and the air flow outlets are arranged in a rectangular array on the working surface, and multiple rows of the welding teeth and multiple rows of the air flow outlets are arranged alternately and / or multiple columns of the welding teeth and multiple columns of the air flow outlets are arranged alternately.

[0010] Furthermore, the welding seat is also provided with a cooling channel, and the cooling channel is used for storing or circulating a cooling medium.

[0011] Furthermore, the welding seat is also provided with a cooling medium inlet and a cooling medium outlet, the cooling channel connects the cooling medium inlet and the cooling medium outlet, the cooling medium inlet is used to receive the cooling medium, the cooling medium outlet is used to discharge the cooling medium, and the cooling medium inlet and the cooling medium outlet are arranged on the surface of the welding seat adjacent to the working surface.

[0012] Furthermore, the cooling channel is a spiral channel or a U-shaped channel, the cooling channel is located on a side of the airflow channel away from the working surface, and at least a portion of the cooling channel is close to at least a portion of the airflow channel.

[0013] Furthermore, the welding seat is also provided with a driving device for driving it to move in a direction approaching and away from the workpiece.

[0014] The utility model also provides an ultrasonic welding system, comprising a welding head mechanism and the welding seat.

[0015] The above technical solution of the utility model has the following advantages compared with the prior art:

[0016] 1) The ultrasonic welding system and welding seat described in the utility model can send positive pressure airflow between the working surface and the workpiece after welding is completed by setting an airflow channel, an airflow inlet and an airflow outlet. The positive pressure airflow generates thrust on the workpiece, thereby avoiding or reducing the problem of the workpiece sticking to the welding seat, thereby avoiding or reducing the problem of the tab being cracked due to stress, and improving the ultrasonic welding yield;

[0017] 2) The ultrasonic welding system and welding seat described in the utility model are provided with multiple airflow outlets, so that multiple positions of the workpiece are subjected to the force of the positive pressure airflow, and the workpiece and the welding seat are more easily separated. By providing an air distribution cavity, the airflow pressure of each airflow outlet is balanced, so that multiple positions of the workpiece are subjected to balanced thrust;

[0018] 3) The ultrasonic welding system and welding seat described in the utility model can be separated from the air inlet and the air outlet by providing an air inlet channel, thereby preventing interference between the pipeline connecting the air inlet and the workpiece and the welding head mechanism;

[0019] 4) The ultrasonic welding system and welding seat described in the utility model have multiple welding teeth evenly distributed on the working surface, so that multiple positions of the workpiece are evenly supported and the workpiece is evenly stressed;

[0020] 5) The ultrasonic welding system and welding seat described in the utility model, the welding teeth and the air flow outlet are arranged according to a certain pattern, so that multiple positions of the workpiece are subjected to uniform thrust and support force;

[0021] 6) The ultrasonic welding system and welding seat described in the utility model can keep the welding seat in a low temperature state during the welding process by providing a cooling channel, or can achieve a rapid cooling effect with high cooling efficiency, thereby improving the ultrasonic welding efficiency and reducing the probability of the workpiece sticking to the welding seat;

[0022] 7) The ultrasonic welding system and welding seat described in the utility model are provided with a cooling medium inlet and a cooling medium outlet, and the welding seat is cooled by the flowing cooling medium, so that the cooling effect is good;

[0023] 8) The ultrasonic welding system and welding seat described in the utility model have a cooling channel that is a spiral channel or a U-shaped channel, with a large cooling area and high cooling efficiency. The cooling channel and the airflow channel are at least partially close to each other, so that the airflow in the airflow channel can be cooled, thereby cooling the adapter;

[0024] 9) The ultrasonic welding system and welding seat thereof described in the utility model, the welding seat is provided with a driving device, after the welding is completed, the driving device drives the welding seat to move in a direction away from the workpiece, thereby realizing the separation of the welding seat and the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the ultrasonic welding system in the utility model;

[0027] Figure 2 It is a three-dimensional diagram of the welding seat in the utility model;

[0028] Figure 3 for Figure 1 A partial enlarged view of the middle A;

[0029] Figure 4 It is a side view of the welding seat in the utility model;

[0030] Figure 5 for Figure 4 Sectional view at the middle BB;

[0031] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0032] Figure 7 The utility model is a flowchart of the ultrasonic welding system.

[0033] Description of the accompanying drawings:

[0034] 1. Welding seat; 11. Working surface; 12. Welding teeth; 13. Air flow inlet; 14. Air flow outlet; 15. Air distribution cavity; 151. First inner wall; 152. Second inner wall; 16. Air inlet channel; 17. Cooling channel; 18. Cooling medium inlet; 19. Cooling medium outlet; 2. Welding head mechanism. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0036] See also Figures 1 to 7 , an embodiment of an ultrasonic welding system and a welding seat thereof provided by the utility model.

[0037] The ultrasonic welding system is used to weld the adapter and the pole lug together. The ultrasonic welding system includes a welding seat 1 and a welding head mechanism 2. The adapter and the pole lug are arranged between the welding seat 1 and the welding head mechanism 2. The adapter contacts the welding seat 1, and the pole lug contacts the welding head mechanism 2, so that the adapter and the pole lug are pressed together.

[0038] The welding seat 1 is provided with a working surface 11, welding teeth 12, an air flow inlet 13, an air flow outlet 14 and an air flow channel. The welding teeth 12 are protrudingly provided on the working surface 11. The welding teeth 12 are used to contact with the adapter. The air flow inlet 13 is used to receive the air flow. The air flow outlet 14 is used to send the air flow between the working surface 11 and the adapter. The air flow channel connects the air flow inlet 13 and the air flow outlet 14.

[0039] The contact area between the welding seat 1 and the adapter cannot be too large, otherwise the welding seat 1 and the adapter will be very easy to stick together, and the contact area between the welding seat 1 and the adapter cannot be too small, otherwise the adapter and the various positions of the pole lug are difficult to be pressed together. A plurality of the above-mentioned welding teeth 12 are arranged on the above-mentioned working surface 11, and different welding teeth 12 are separated by a certain distance. By contacting different positions of the adapter with the multiple above-mentioned welding teeth 12, the contact area between the welding teeth 12 and the adapter will not be too large or too small, the adapter and the welding teeth 12 are not easy to stick together, and the adapter and the various positions of the pole lug can be pressed together. The number and size of the above-mentioned welding teeth 12 are designed according to the size and type of the welding seat 1.

[0040] The airflow inlet 13 is used to supply airflow into the airflow channel. The airflow inlet 13 is connected to a pipe outside the welding seat 1. The airflow outlet 14 is used to supply airflow out of the airflow channel. The airflow outlet 14 penetrates the area on the working surface 11 where no welding teeth are provided or penetrates the surface of the welding teeth 12, thereby delivering positive pressure airflow between the working surface 11 and the adapter. The size and shape of the airflow inlet 13, the airflow channel and the airflow outlet 14 are adjusted according to the size and type of the welding seat 1, and the resonance during welding should also be considered to ensure that the welding effect is not affected.

[0041] In the prior art, the welding seat is not provided with the above-mentioned airflow inlet, airflow channel and airflow outlet. After the welding is completed, the welding seat 1 and the adapter are separated from each other, and the adapter is subjected to the pulling force of the welding seat. The adapter transmits the pulling force to the tab, which easily causes the tab to crack under stress. In the utility model, the airflow is transported to between the working surface 11 and the adapter through the above-mentioned airflow inlet 13, airflow channel and airflow outlet 14. The positive pressure airflow output from the above-mentioned airflow outlet 14 can act on the adapter to generate thrust on the adapter. After the welding is completed, the welding head mechanism 2 is away from the tab, and the positive pressure airflow is introduced into the airflow inlet, and the positive pressure airflow is then discharged from the airflow outlet 14. When the welding seat 1 and the adapter are separated from each other, the adapter is subjected to the pulling force of the welding seat 1 and the thrust of the positive pressure airflow. The pulling force of the welding seat 1 is opposite to the thrust of the positive pressure airflow. The pulling force transmitted to the tab by the adapter becomes smaller, which can avoid or alleviate the problem of tab cracking under stress, and improve the ultrasonic welding yield.

[0042] In the preferred implementation manner of the present embodiment, the welding seat 1 is provided with a plurality of the air flow outlets 14, and the air flow channel includes an air distribution cavity 15, the air distribution cavity 15 has a first inner wall 151 parallel to and opposite to the working surface 11 and a second inner wall 152 parallel to and opposite to the first inner wall 151, and the plurality of air flow outlets 14 are evenly distributed and pass through the working surface 11 and the first inner wall 151.

[0043] The airflow outlet 14 should not only ensure that the adapter is thrusted, but also should not affect the contact between the welding seat 1 and the adapter. Therefore, the airflow outlet 14 is set as dispersed small holes, and the airflow outlet 14 can be arranged between different welding teeth 12. By setting a plurality of airflow outlets 14, multiple positions of the adapter are subjected to the thrust of the positive pressure airflow, and the thrust is large, making it easier to separate the adapter from the welding seat. By setting an air distribution cavity 15, the airflow pressure of each airflow outlet 14 is balanced, so that multiple positions of the adapter are subjected to balanced positive pressure thrust.

[0044] In the preferred implementation manner of the present embodiment, the welding seat is provided with an air flow inlet 13, and the air flow channel also includes an air inlet channel 16, the air inlet channel 16 is a cylindrical channel, one axial end of the cylindrical channel passes through the second inner wall 152, and the air flow inlet 13 passes through the side wall of the cylindrical channel.

[0045] Since the distance between the air distribution cavity 15 and the working surface 11 is relatively close, if the air flow inlet 13 is directly connected to the air distribution cavity 15, the distance between the air flow inlet 13 and the working surface 11 is also relatively close, and the pipeline connecting the air flow inlet 13 is easy to interfere with the adapter, the pole ear and the welding head mechanism. Therefore, a columnar air inlet 16 is provided, and the air flow inlet 13 is connected to the air inlet 16, and the distance between the air flow inlet 13 and the working surface 11, the adapter, the pole ear and the welding head mechanism can be relatively far apart, so as to prevent the pipeline connecting the air flow inlet 13 from interfering with the working surface 11, the adapter, the pole ear and the welding head mechanism.

[0046] In a preferred implementation manner of the present embodiment, the welding seat 1 is provided with a plurality of welding teeth 12 , and the plurality of welding teeth 12 are evenly distributed on the working surface 11 .

[0047] The welding teeth 12 are in contact with the adapter, and the contact position between the welding teeth 12 and the adapter is the force-bearing position of the adapter. In order to make the adapter bear force evenly, a plurality of welding teeth 12 are evenly distributed on the working surface 11 so that the adapter is subjected to uniform supporting force.

[0048] In a preferred implementation manner of the present embodiment, the welding teeth 12 and the air flow outlets 14 are arranged in a rectangular array on the working surface 11, and multiple rows of the welding teeth 12 and multiple rows of the air flow outlets 14 are alternately arranged and / or multiple columns of the welding teeth 12 and multiple columns of the air flow outlets 14 are alternately arranged.

[0049] Specifically in this embodiment, the welding teeth 12 form a welding tooth array, and the air outlet 14 forms an air outlet array. The welding tooth array and the air outlet array have the same row direction and the same column direction. The welding tooth array is translated along the row direction for a certain distance and then along the column direction for a certain distance to coincide with the air outlet array, or the air outlet array is translated along the row direction for a certain distance and then along the column direction for a certain distance to coincide with the welding tooth array, or the welding tooth array is translated along the row direction for a certain distance and the air outlet array is translated along the column direction for a certain distance, and the two coincide with each other, or the welding tooth array is translated along the column direction for a certain distance and the air outlet array is translated along the row direction for a certain distance, and the two coincide with each other. The welding teeth 12 and the air outlet 14 are arranged according to a certain rule, so that multiple positions of the workpiece are subjected to uniform positive pressure thrust and support force.

[0050] In a preferred implementation manner of this embodiment, the welding seat 1 is further provided with a cooling channel 17, and the cooling channel 17 is used to store or circulate a cooling medium.

[0051] The above-mentioned cooling medium can be a liquid material, a gaseous material or a phase change material. The cooling medium being a liquid material means that the cooling medium is always in liquid form during the entire heat dissipation process. Using a liquid material as a cooling medium belongs to a liquid cooling heat dissipation method. By keeping the cooling medium within a relatively low temperature range, the heat generated during welding is absorbed. The liquid cooling medium can be water, oil or other liquids with relatively large specific heat capacity. The cooling medium being a gaseous material means that the cooling medium is always in gaseous form during the entire heat dissipation process. Using a gaseous material as a cooling medium belongs to an air cooling heat dissipation method. The cooling medium being a phase change material means that the cooling medium will undergo a phase change during the entire heat dissipation process. Using a phase change material as a cooling medium belongs to a phase change heat dissipation method. The phase change heat dissipation method uses the technology that absorbs or releases heat when the phase of a substance changes. For example, when water changes from liquid to gas, it can absorb a large amount of heat with almost no temperature change, thereby achieving a very good cooling effect.

[0052] In the prior art, in order to ensure sufficient friction heat during ultrasonic welding, it is necessary to increase the welding head pressure and the friction coefficient, or increase the corresponding welding parameters. At this time, the temperature in the welding area will rise sharply, and a blowing device is usually added to the welding head welding seat area for cooling to ensure that the objects to be welded are not stuck, thereby affecting the welding effect; however, this method has a low cooling efficiency and cannot meet the requirements of high-speed production lines; by setting a cooling channel 17, the welding seat 1 can be kept in a low temperature state during the welding process, or a rapid cooling effect can be achieved, and the cooling efficiency is high, thereby improving the ultrasonic welding efficiency and reducing the probability of the phenomenon of sticking to the welding seat 1.

[0053] In the preferred implementation manner of this embodiment, the welding seat 1 is further provided with a cooling medium inlet 18 and a cooling medium outlet 19, the cooling channel 17 connects the cooling medium inlet 18 and the cooling medium outlet 19, the cooling medium inlet 18 is used to receive the cooling medium, the cooling medium outlet 19 is used to discharge the cooling medium, and the cooling medium inlet 18 and the cooling medium outlet 19 are arranged on the surface of the welding seat adjacent to the working surface.

[0054] The cooling medium inlet 18 is used for the flowing cooling medium to flow into the cooling channel 17, and the cooling medium outlet 19 is used for the flowing cooling medium to flow out of the cooling channel 17. The cooling medium inlet 18 and the cooling medium outlet 19 are connected to the pipeline located outside the welding seat. After the cooling medium flows out of the cooling channel 17, it naturally cools down and then flows into the cooling channel 17, or cools down by other auxiliary means and then flows into the cooling channel 17. The cooling medium keeps flowing and continuously flows into and out of the cooling channel 17. The temperature difference between the cooling medium and the welding seat 1 always exists, the heat exchange rate will not be reduced, and the effect of cooling the welding seat 1 by the flowing cooling medium is better.

[0055] In a preferred implementation manner of this embodiment, the cooling channel 17 is located on a side of the airflow channel away from the working surface, the cooling channel 17 is a spiral channel or a U-shaped channel, and at least a portion of the cooling channel 17 is close to at least a portion of the airflow channel.

[0056] The cooling channel 17 is located at the first side of the airflow away from the working surface, and cools the airflow channel while not interfering with the connection between the airflow channel and the working surface. The cooling channel 17 is a spiral channel or a U-shaped channel, with a large cooling area and high cooling efficiency. The cooling channel 17 and at least a part of the airflow channel are close to each other, so that the airflow temperature in the airflow channel is reduced, and the positive pressure airflow can cool the adapter while the auxiliary welding seat 1 is separated from the adapter.

[0057] In the preferred implementation mode of this embodiment, the welding seat 1 is further provided with a driving device (not shown in the figure) for driving it to move in the direction of approaching and moving away from the adapter.

[0058] When welding is completed, the welding seat 1 and the adapter need to be separated from each other. By setting a driving device, the welding seat is moved away from the adapter to achieve separation of the welding seat and the adapter, which not only saves manpower, but also because the driving device maintains the set parameters, the pulling force of the welding seat on the adapter can maintain the set size and direction.

[0059] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A welding seat of an ultrasonic welding system, characterized in that: The welding seat (1) is provided with a working surface (11), welding teeth (12), an air flow inlet (13), an air flow outlet (14) and an air flow channel, wherein the welding teeth (12) are protrudingly arranged on the working surface (11), the welding teeth (12) are used to contact with a workpiece, the air flow inlet (13) is used to receive air flow, the air flow outlet (14) is used to send air flow between the working surface (11) and the workpiece, and the air flow channel connects the air flow inlet (13) and the air flow outlet (14).

2. The welding seat according to claim 1, characterized in that: The welding seat (1) is provided with a plurality of air flow outlets (14), the air flow channel comprises an air distribution cavity (15), the air distribution cavity (15) comprises a first inner wall (151) parallel to and opposite to the working surface (11) and a second inner wall (152) parallel to and opposite to the first inner wall (151), and the plurality of air flow outlets (14) are evenly distributed and pass through the working surface (11) and the first inner wall (151).

3. The welding seat according to claim 2, characterized in that: The welding seat (1) is provided with an air flow inlet (13), and the air flow channel further comprises an air inlet channel (16), the air inlet channel (16) is a cylindrical channel, one axial end of the cylindrical channel passes through the second inner wall (152), and the air flow inlet (13) passes through the side wall of the cylindrical channel.

4. The welding seat according to claim 2, characterized in that: The welding seat (1) is provided with a plurality of welding teeth (12), and the plurality of welding teeth (12) are evenly distributed on the working surface (11).

5. The welding base according to claim 1, characterized in that: The welding teeth (12) and the air flow outlets (14) are arranged in a rectangular array on the working surface (11), and a plurality of rows of the welding teeth (12) and a plurality of rows of the air flow outlets (14) are arranged alternately at intervals and / or a plurality of columns of the welding teeth (12) and a plurality of columns of the air flow outlets (14) are arranged alternately at intervals.

6. The welding base according to any one of claims 1 to 5, characterized in that: The welding seat (1) is also provided with a cooling channel (17), and the cooling channel (17) is used to store or circulate a cooling medium.

7. The welding base according to claim 6, characterized in that: The welding seat (1) is also provided with a cooling medium inlet (18) and a cooling medium outlet (19); the cooling channel (17) is connected to the cooling medium inlet (18) and the cooling medium outlet (19); the cooling medium inlet (18) is used to receive the cooling medium; the cooling medium outlet (19) is used to discharge the cooling medium; the cooling medium inlet (18) and the cooling medium outlet (19) are arranged on a surface of the welding seat (1) adjacent to the working surface (11).

8. The welding seat according to claim 6, characterized in that: The cooling channel (17) is a spiral channel or a U-shaped channel, the cooling channel (17) is located on a side of the airflow channel away from the working surface, and at least a portion of the cooling channel (17) is close to at least a portion of the airflow channel.

9. The welding base according to claim 1, characterized in that: The welding seat (1) is also provided with a driving device for driving it to move in a direction approaching and moving away from the workpiece.

10. An ultrasonic welding system, characterized in that: It comprises a welding head mechanism (2) and a welding seat (1) as claimed in any one of claims 1 to 9.

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