Welding device

Abstract

The utility model relates to a welding device which comprises a driving mechanism, a first heating mechanism and a second heating mechanism. The first heating mechanism and the second heating mechanism are respectively connected to the driving mechanism and are oppositely arranged at an interval; a first limiting groove is formed in one end of the first heating mechanism, and a second limiting groove is formed in one end of the second heating mechanism. An opening in one side of the first limiting groove is opposite to an opening in one side of the second limiting groove. The driving mechanism can drive the first heating mechanism and the second heating mechanism to be close to each other, so that the first limiting groove and the second limiting groove are matched to limit the welding strip, and the driving mechanism can drive the first heating mechanism and the second heating mechanism which are close to each other to stretch out to press the welding strip in a matched mode. According to the welding device, the automation degree of pseudo soldering repair can be improved, manpower is saved, standardization of repair welding is achieved, and welding quality differences caused by differences of pressing force, welding time and the like in manual operation are avoided.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic production equipment technology, and in particular to a welding device. Background Technology

[0002] In the manufacturing process of photovoltaic modules, solder ribbons are used to connect multiple solar cells into strings. In actual production, solder ribbon welding abnormalities are difficult to avoid. Among these, incomplete soldering is relatively common, characterized by the solder ribbon failing to make effective contact with the solder pads (PADs) on the solar cell.

[0003] There are two main types of cold solder joints: one where the solder strip contacts the solder joint but fails to form an effective alloy layer, and the other where the solder strip is misaligned from the solder joint, preventing proper welding. Currently, repairing cold solder joints relies on manual labor. The former type can be repaired by spot-welding with a hand soldering iron at the affected area. The latter type requires first correcting the solder strip's position to the solder joint before spot-welding.

[0004] However, manual rework is labor-intensive, and due to individual differences in operation, the consistency of rework quality cannot be guaranteed among different operators. For example, the pressure and welding time vary among different operators, making effective control difficult. These factors all have a significant impact on rework quality. For instance, excessive pressure can easily cause microcracks in the battery cells. If the welding time is too short, an effective alloy layer cannot be formed, resulting in a high risk of desoldering, while excessive welding time can lead to over-soldering, posing risks such as silver corrosion and solder joint detachment. Utility Model Content

[0005] Therefore, it is necessary to provide a welding device to improve the automation of repairing incomplete welds and avoid welding quality differences caused by manual operation.

[0006] The solution of this utility model is as follows:

[0007] A welding apparatus includes a drive mechanism and a first heating mechanism and a second heating mechanism respectively connected to the drive mechanism;

[0008] The first heating mechanism and the second heating mechanism are arranged opposite to each other and spaced apart. One end of the first heating mechanism is provided with a first limiting groove, and one end of the second heating mechanism is provided with a second limiting groove. The opening on one side of the first limiting groove and the opening on one side of the second limiting groove are opposite to each other.

[0009] The driving mechanism can drive the first heating mechanism and the second heating mechanism to move closer to each other so that the first limiting groove and the second limiting groove cooperate to limit the welding strip, and can drive the first heating mechanism and the second heating mechanism that are close to each other to extend out in order to press down the welding strip.

[0010] In one embodiment, the depth of the first limiting groove is 0.05mm to 2mm.

[0011] In one embodiment, the depth of the second limiting groove is 0.05mm to 2mm.

[0012] In one embodiment, the width of the first limiting groove is 0.4mm to 1mm.

[0013] In one embodiment, the width of the second limiting groove is 0.4mm to 1mm.

[0014] In one embodiment, the driving mechanism includes a first driving component and a second driving component. The first driving component is connected to the first heating mechanism and the second heating mechanism to drive the first heating mechanism and the second heating mechanism to move closer to each other in a first direction. The second driving component is connected to the first driving component to drive the first driving component, the first heating mechanism and the second heating mechanism to move as a whole in a second direction, which is different from the first direction.

[0015] In one embodiment, the second direction is perpendicular to the first direction.

[0016] In one embodiment, the first driving component includes a first transmission component and a second transmission component. The first transmission component is connected to the first heating mechanism to drive the first heating mechanism to move in a first direction, and the second transmission component is connected to the second heating mechanism to drive the second heating mechanism to move in the first direction.

[0017] In one embodiment, the first transmission component and / or the second transmission component is a motor lead screw drive assembly.

[0018] In one embodiment, the second driving component is a motor lead screw drive assembly.

[0019] In one embodiment, the welding apparatus further includes a first elastic connection mechanism, through which the first driving component is elastically connected to the first heating mechanism.

[0020] In one embodiment, the welding apparatus further includes a second elastic connection mechanism, through which the first driving component is elastically connected to the second heating mechanism.

[0021] In one embodiment, the first elastic connection mechanism includes a first spring, the two ends of which are respectively connected to the first driving component and the first heating mechanism.

[0022] In one embodiment, the second elastic connection mechanism includes a second spring, the two ends of which are respectively connected to the second driving component and the second heating mechanism.

[0023] In one embodiment, the first elastic connection mechanism further includes a first sleeve and a first limiting rod. The first sleeve is sleeved on the first spring. One end of the first sleeve is connected to the first driving component. The first spring extends out of the other end of the first sleeve in its natural state. One end of the first limiting rod is connected to the first heating mechanism. The first limiting rod passes through the first spring and extends into the first sleeve. The length of the first spring in its natural state is greater than the length of the first limiting rod.

[0024] In one embodiment, the second elastic connection mechanism further includes a second sleeve and a second limiting rod. The second sleeve is sleeved on the second spring. One end of the second sleeve is connected to the second driving component. The second spring extends out of the other end of the second sleeve in its natural state. One end of the second limiting rod is connected to the second heating mechanism. The second limiting rod passes through the second spring and extends into the second sleeve. The length of the second spring in its natural state is greater than the length of the second limiting rod.

[0025] Compared with traditional technologies, the above-mentioned welding device has the following advantages:

[0026] The aforementioned welding device includes a first heating mechanism and a second heating mechanism arranged opposite each other and spaced apart, positioned on both sides of the welding strip. Driven by a driving mechanism, the first and second heating mechanisms move closer together, during which the first and second limiting grooves correct and limit the position of the welding strip. Then, the first and second heating mechanisms extend and generate heat, pressing the welding strip onto the solder joint on the battery cell. After being heated, an alloy layer forms between the welding strip and the solder joint, achieving welding.

[0027] The aforementioned welding device can improve the automation level of repairing incomplete welds, save manpower, and standardize the repair welding process, avoiding differences in welding quality caused by variations in pressure and welding time during manual operations. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a welding apparatus according to one embodiment;

[0029] Figure 2 for Figure 1 Exploded view of the welding apparatus shown;

[0030] Figure 3 for Figure 1A schematic diagram of the welding device from another perspective;

[0031] Figure 4 for Figure 1 The diagram shows the welding device with the first and second heating mechanisms in the open state during the welding process.

[0032] Figure 5 for Figure 4 A magnified view of a portion of the image;

[0033] Figure 6 for Figure 1 The diagram shows the welding device in which the first heating mechanism and the second heating mechanism are in a close-to-each-other state during the welding process.

[0034] Figure 7 for Figure 6 A magnified view of a portion of the image;

[0035] Figure 8 for Figure 1 The diagram shows the welding device in which the first heating mechanism and the second heating mechanism press the welding strip together during the welding process.

[0036] Figure 9 for Figure 8 A magnified view of a portion of the image.

[0037] Explanation of reference numerals in the attached figures:

[0038] 10. Welding device; 100. Drive mechanism; 110. First drive component; 111. First transmission component; 112. Second transmission component; 120. Second drive component; 130. Connecting seat; 200. First heating mechanism; 210. First connecting part; 220. First pressing part; 222. First limiting groove; 300. Second heating mechanism; 310. Second connecting part; 320. Second pressing part; 322. Second limiting groove; 400. First elastic connecting mechanism; 410. First spring; 420. First sleeve; 430. First limiting rod; 500. Second elastic connecting mechanism; 510. Second spring; 520. Second sleeve; 530. Second limiting rod; 20. Welding strip; 30. Battery cell; 31. Welding point. Detailed Implementation

[0039] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0040] 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 invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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 communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] like Figure 1 and Figure 2 As shown, a welding apparatus 10 in one embodiment includes a drive mechanism 100, a first heating mechanism 200, and a second heating mechanism 300.

[0045] The first heating mechanism 200 and the second heating mechanism 300 are respectively connected to the drive mechanism 100, and are arranged opposite to each other and spaced apart. One end of the first heating mechanism 200 is provided with a first limiting groove 222, and one end of the second heating mechanism 300 is provided with a second limiting groove 322. One side opening of the first limiting groove 222 and one side opening of the second limiting groove 322 are opposite to each other.

[0046] The driving mechanism 100 can drive the first heating mechanism 200 and the second heating mechanism 300 to move closer together so that the first limiting groove 222 and the second limiting groove 322 cooperate to limit the welding strip, and can drive the first heating mechanism 200 and the second heating mechanism 300 to extend out to press down the welding strip.

[0047] For ease of explanation, such as Figure 3 As shown, "first direction" and "second direction" are defined as two different directions. The first heating mechanism 200 and the second heating mechanism 300 move closer to each other along the "first direction," while the first heating mechanism 200 and the second heating mechanism 300 that move closer to each other extend along the "second direction." "First direction" and "second direction" do not refer to any specific direction.

[0048] In some examples, the first direction is horizontal and the second direction is vertical.

[0049] like Figure 4 and Figure 5 As shown, the welding device 10 is used to weld the welding strip 20 to the solder joint 31 on the battery cell 30. The welding device 10 has a first heating mechanism 200 and a second heating mechanism 300 arranged opposite to and spaced apart from each other, positioned on both sides of the welding strip 20. At this time, the first heating mechanism 200 and the second heating mechanism 300 are in the open state. Figure 6 and Figure 7 As shown, the first heating mechanism 200 and the second heating mechanism 300 move closer together under the drive of the driving mechanism 100. During this process, the first limiting groove 222 and the second limiting groove 322 can realize the position correction and limiting of the welding strip 20. At this time, the first heating mechanism 200 and the second heating mechanism 300 are in a close-to-each-other state. Then, as... Figure 8 and Figure 9 As shown, the first heating mechanism 200 and the second heating mechanism 300 extend and generate heat, pressing the welding ribbon 20 onto the welding point 31 on the battery cell 30. After being heated, the welding ribbon 20 forms an alloy layer with the welding point 31, thus achieving welding.

[0050] The aforementioned welding device 10 can improve the automation level of rework repair, save manpower, and standardize rework welding, avoiding differences in welding quality caused by differences in pressure and welding time in manual operations.

[0051] In some examples, the drive mechanism 100 includes a first drive component 110 and a second drive component 120. The first drive component 110 is connected to the first heating mechanism 200 and the second heating mechanism 300 to drive the first heating mechanism 200 and the second heating mechanism 300 to move towards each other in a first direction. The second drive component 120 is connected to the first drive component 110 to drive the first drive component 110, the first heating mechanism 200, and the second heating mechanism 300 as a whole to move in a second direction.

[0052] In some examples, the first direction is horizontal and the second direction is vertical. In this example, the first driving component 110 is used to drive the first heating mechanism 200 and the second heating mechanism 300 to move horizontally, thereby correcting and positioning the solder strip 20. The second driving component 120 is used to drive the first driving component 110, the first heating mechanism 200, and the second heating mechanism 300 to rise or fall as a whole.

[0053] In some examples, the first driving component 110 includes a first transmission component 111 and a second transmission component 112. The first transmission component 111 is connected to the first heating mechanism 200 for driving the first heating mechanism 200 to move in a first direction, and the second transmission component 112 is connected to the second heating mechanism 300 for driving the second heating mechanism 300 to move in the first direction.

[0054] In some examples, the first transmission component 111 and / or the second transmission component 112 is a motor screw drive assembly. The motor screw drive assembly can precisely control the distance the corresponding heating mechanism moves. More specifically, in some examples, the motor screw drive assembly includes a drive motor, a lead screw, and a ball nut seat. The drive motor is connected to the lead screw, the lead screw engages with the ball nut seat, and the ball nut seat is connected to the corresponding heating mechanism. Thus, by driving the lead screw to rotate via the drive motor, the corresponding heating mechanism can be moved.

[0055] In some examples, the second drive component 120 is a motor lead screw drive assembly. This allows for precise control of the distance between the first heating mechanism 200, the second heating mechanism 300, and the battery cell 30, and also enables adaptation to battery cells 30 of different thicknesses and types, improving the flexibility and adaptability of the welding strip 20.

[0056] In some examples, the drive mechanism 100 further includes a connecting seat 130, through which the second drive component 120 is connected to the first drive component 110. In the specific example illustrated, the connecting seat 130 is a plate-like structure, with the first drive component 110 and the second drive component 120 respectively connected to opposite sides of the connecting seat 130. There are two second drive components 120, arranged opposite each other in a first direction.

[0057] The first heating element 200 and the second heating element 300 serve as the heat source for welding, and can be, but are not limited to, an electric soldering iron. The electric soldering iron converts electrical energy into heat energy through the principle of electrothermal conversion, enabling it to quickly reach the temperature required for welding and thus weld the solder strip 20.

[0058] During welding, the temperature of the first heating mechanism 200 and the second heating mechanism 300 is, for example, 300~400℃, and the spot welding time is, for example, 2~3s.

[0059] In some examples, the first heating mechanism 200 includes a first connecting portion 210 and a first pressing portion 220 connected together. The width of the first connecting portion 210 in a first direction is greater than the width of the first pressing portion 220 in the first direction. The first connecting portion 210 is connected to the driving mechanism 100, and the first pressing portion 220 is used to contact the battery cell 30. A first limiting groove 222 is located on the first pressing portion 220. The larger width of the first connecting portion 210 facilitates a better fixed connection with the driving mechanism 100, while the smaller width of the first pressing portion 220 facilitates the alignment and welding of the solder ribbon 20 on the battery cell 30.

[0060] The second heating mechanism 300 includes a second connecting portion 310 and a second pressing portion 320 connected together. The width of the second connecting portion 310 in the first direction is greater than the width of the second pressing portion 320 in the first direction. The second connecting portion 310 is connected to the driving mechanism 100, the second pressing portion 320 is used to contact the battery cell 30, and the second limiting groove 322 is located on the second pressing portion 320.

[0061] The depths of the first limiting groove 222 and the second limiting groove 322 are designed according to the thickness of the solder strip 20 used. For example, in some examples, the depth of the first limiting groove 222 is 0.05mm to 2mm, specifically 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 2mm, etc. In some examples, the depth of the second limiting groove 322 is 0.05mm to 2mm, specifically 0.05mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, 0.18mm, 2mm, etc. The depths of the first limiting groove 222 and the second limiting groove 322 can be the same or different. The depth of the limiting groove is the distance between the groove opening and the groove bottom in the second direction.

[0062] The widths of the first limiting groove 222 and the second limiting groove 322 are designed according to the width of the welding strip 20 used. For example, in some examples, the width of the first limiting groove 222 is 0.4mm to 1mm, specifically 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. In some examples, the width of the second limiting groove 322 is 0.4mm to 1mm, specifically 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. The widths of the first limiting groove 222 and the second limiting groove 322 can be the same or different. The width of the limiting groove is the distance between the groove opening and the groove bottom in the first direction.

[0063] In the specific example shown, the first limiting groove 222 and the second limiting groove 322 are rectangular in shape. In other examples, the shape of the limiting groove is not limited to a rectangle; for example, it can also be triangular or a quarter circle. The specific design can be based on the shape of the solder ribbon 20 and the height of the solder joint 31, as long as it can achieve the effect of correcting the position of the solder ribbon 20 and pressing the solder ribbon 20 firmly onto the solder joint 31.

[0064] In some examples, the welding apparatus 10 further includes a first elastic connection mechanism 400, through which the first driving component 110 is elastically connected to the first heating mechanism 200. Thus, when the first heating mechanism 200 presses down on the battery cell 30, the first elastic connection mechanism 400 acts as a buffer, achieving flexible contact between the first heating mechanism 200 and the battery cell 30, preventing damage such as microcracks in the battery cell 30 due to excessive pressure. Simultaneously, the elastic force of the first elastic connection mechanism 400 also ensures stable contact between the first heating mechanism 200 and the battery cell 30, guaranteeing effective heat transfer and improving the reliability and quality of the welding.

[0065] In some examples, the first elastic connection mechanism 400 includes a first spring 410. The two ends of the first spring 410 are connected to the first drive component 110 and the first heating mechanism 200, respectively.

[0066] Furthermore, the first elastic connection mechanism 400 also includes a first sleeve 420 and a first limiting rod 430. The first sleeve 420 is sleeved on the first spring 410, one end of the first sleeve 420 is connected to the first driving component 110, and the first spring 410 extends out of the other end of the first sleeve 420 in its natural state. One end of the first limiting rod 430 is connected to the first heating mechanism 200, and the first limiting rod 430 passes through the first spring 410 and extends into the first sleeve 420. The length of the first spring 410 in its natural state is greater than the length of the first limiting rod 430. By setting the first sleeve 420 and the first limiting rod 430, the equipment structure can be made more stable, and the working accuracy of the equipment can be improved.

[0067] Similarly, the welding device 10 also includes a second elastic connection mechanism 500, through which the first driving component 110 is elastically connected to the second heating mechanism 300.

[0068] Furthermore, the second elastic connection mechanism 500 includes a second spring 510, the two ends of which are respectively connected to the second driving component 120 and the second heating mechanism 300.

[0069] Furthermore, the second elastic connection mechanism 500 also includes a second sleeve 520 and a second limiting rod 530. The second sleeve 520 is sleeved on the second spring 510, one end of the second sleeve 520 is connected to the second driving component 120, the second spring 510 extends out of the other end of the second sleeve 520 in its natural state, one end of the second limiting rod 530 is connected to the second heating mechanism 300, the second limiting rod 530 passes through the second spring 510 and extends into the second sleeve 520, and the length of the second spring 510 in its natural state is greater than the length of the second limiting rod 530.

[0070] Currently, in the visual inspection (EL) process, machine vision and AI (artificial intelligence) technologies can accurately identify the location and type of poor solder joints in the solder strip 20. This signal is then output, allowing the controller to operate the various components of the welding device 10, enabling online automatic rework.

[0071] Taking the welding device 10 shown in the illustration as an example, its working process is as follows:

[0072] Process 1, such as Figure 4 and Figure 5 As shown, the second driving component 120 is controlled to move, driving the first driving component 110, the first heating mechanism 200, and the second heating mechanism 300 to descend as a whole, until the first heating mechanism 200 and the second heating mechanism 300 are close to the surface of the battery cell 30, with their ends slightly higher than the battery cell 30. At this time, the solder ribbon 20 is located between the first heating mechanism 200 and the second heating mechanism 300.

[0073] Process 2, such as Figure 6 and Figure 7 As shown, the first driving component 110 is controlled to move, driving the first heating mechanism 200 and the second heating mechanism 300 to move closer together. With the cooperation of the first limiting groove 222 and the second limiting groove 322, the solder ribbon 20 is limited to the solder joint 31 on the battery cell 30 that needs to be re-welded. If the solder ribbon 20 deviates from the position of the solder joint 31, resulting in a poor solder joint, the position of the solder ribbon 20 is corrected when the first heating mechanism 200 and the second heating mechanism 300 are brought together.

[0074] In process 3, the heating of the first heating mechanism 200 and the second heating mechanism 300 is started to raise the temperature to the range required for welding.

[0075] Process 4, such as Figure 8 and Figure 9 As shown, the second drive component 120 is activated again, driving the first drive component 110, the first heating mechanism 200, and the second heating mechanism 300 to descend as a whole, pressing the welding strip 20 onto the welding point 31 for welding. At this time, the first elastic connecting mechanism 400 and the second elastic connecting mechanism 500 act as a buffer to prevent damage such as microcracks in the battery cell 30 due to excessive pressure.

[0076] In process 5, after welding is completed, the first heating mechanism 200 and the second heating mechanism 300 stop heating. The second driving component 120 is controlled to operate again, driving the first driving component 110, the first heating mechanism 200 and the second heating mechanism 300 to rise and reset as a whole. The first driving component 110 also drives the first heating mechanism 200 and the second heating mechanism 300 to move away from each other and reset, preparing for the next welding.

[0077] The aforementioned welding device 10 can be applied to the repair of poor solder joints in various solar cells. It can improve the automation level of poor solder joint repair, save manpower, and standardize the repair welding process, avoiding differences in welding quality caused by variations in pressure and welding time during manual operation. Especially for back-contact cells, where the grid lines are all located on the back of the cell, the welding strip 20 is only welded on the back of the cell. This type of solar cell does not require front-side poor solder joint repair as in bifacial welded cells, and has very high value for on-line repair of poor solder joints and high potential for automated repair of poor solder joints.

[0078] The aforementioned welding device 10 can be added to the string welding equipment to enable online repair of batteries during flip inspection, thereby reducing the risks caused by string rework and the back-and-forth handling of battery strings.

[0079] Multiple welding devices 10 can be provided. For example, multiple welding devices 10 can be installed on a mounting base or arranged in an array, corresponding to the positions of each solder point 31 on the battery cell 30, so as to realize the simultaneous rework of multiple poor solder joints on the same battery string and improve the rework efficiency.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims, and the specification can be used to interpret the content of the claims.

Claims

1. A welding device (10) characterized by, The device comprises a driving mechanism (100) and a first heating mechanism (200) and a second heating mechanism (300) connected to the driving mechanism (100) respectively; The first heating mechanism (200) and the second heating mechanism (300) are oppositely and spacedly arranged, one end of the first heating mechanism (200) is provided with a first limiting slot (222), one end of the second heating mechanism (300) is provided with a second limiting slot (322), and one side opening of the first limiting slot (222) and one side opening of the second limiting slot (322) are opposite to each other; The driving mechanism (100) can drive the first heating mechanism (200) and the second heating mechanism (300) to approach each other, so that the first limiting slot (222) and the second limiting slot (322) cooperate to limit the welding strip (20), and can drive the first heating mechanism (200) and the second heating mechanism (300) to extend after approaching each other, so as to press the welding strip (20).

2. The welding device (10) according to claim 1, characterized in that The depth of the first limiting slot (222) is 0.05mm-2mm; And / or, the depth of the second limiting slot (322) is 0.05mm-2mm.

3. The welding device (10) according to claim 1, characterized in that The width of the first limiting slot (222) is 0.4mm-1mm; And / or, the width of the second limiting slot (322) is 0.4mm-1mm.

4. The welding device (10) according to claim 1, characterized in that The driving mechanism (100) comprises a first driving component (110) and a second driving component (120), the first driving component (110) is connected to the first heating mechanism (200) and the second heating mechanism (300) for driving the first heating mechanism (200) and the second heating mechanism (300) to approach each other in a first direction, the second driving component (120) is connected to the first driving component (110) for driving the first driving component (110), the first heating mechanism (200) and the second heating mechanism (300) to move as a whole in a second direction, and the second direction is different from the first direction.

5. The welding device (10) according to claim 4, characterized in that The first driving component (110) comprises a first transmission component (111) and a second transmission component (112), the first transmission component (111) is connected to the first heating mechanism (200) for driving the first heating mechanism (200) to move in a first direction, and the second transmission component (112) is connected to the second heating mechanism (300) for driving the second heating mechanism (300) to move in a first direction; And / or, the second direction is perpendicular to the first direction.

6. The welding device (10) according to claim 5, characterized in that The first transmission component (111) and / or the second transmission component (112) is a motor screw rod transmission assembly.

7. The welding device (10) according to claim 4, characterized in that The second driving component (120) is a motor screw rod transmission assembly.

8. The welding device (10) according to any one of claims 4 to 7, characterized in that The welding device (10) further comprises a first elastic connecting mechanism (400), and the first driving component (110) is elastically connected to the first heating mechanism (200) through the first elastic connecting mechanism (400); And / or, the welding device (10) further comprises a second elastic connecting mechanism (500), the first driving component (110) is elastically connected with the second heating mechanism (300) through the second elastic connecting mechanism (500).

9. The welding device (10) according to claim 8, characterized in that The first elastic connecting mechanism (400) comprises a first spring (410), two ends of the first spring (410) are connected with the first driving component (110) and the first heating mechanism (200) respectively; And / or, the second elastic connecting mechanism (500) comprises a second spring (510), two ends of the second spring (510) are connected with the second driving component (120) and the second heating mechanism (300) respectively.

10. The welding device (10) according to claim 9, characterized in that The first elastic connecting mechanism (400) further comprises a first sleeve (420) and a first limiting rod (430), the first sleeve (420) is sleeved on the first spring (410), one end of the first sleeve (420) is connected with the first driving component (110), the first spring (410) is stretched out from the other end of the first sleeve (420) in a natural state, one end of the first limiting rod (430) is connected to the first heating mechanism (200), the first limiting rod (430) is arranged in the first spring (410) and extends into the first sleeve (420), the length of the first spring (410) in the natural state is greater than the length of the first limiting rod (430); And / or, the second elastic connecting mechanism (500) further comprises a second sleeve (520) and a second limiting rod (530), the second sleeve (520) is sleeved on the second spring (510), one end of the second sleeve (520) is connected with the second driving component (120), the second spring (510) is stretched out from the other end of the second sleeve (520) in a natural state, one end of the second limiting rod (530) is connected to the second heating mechanism (300), the second limiting rod (530) is arranged in the second spring (510) and extends into the second sleeve (520), the length of the second spring (510) in the natural state is greater than the length of the second limiting rod (530).

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