Welding equipment and blowing structure

Abstract

The utility model discloses welding equipment and an air blowing structure, and relates to the technical field of welding machining. Wherein the welding equipment comprises a fusion welding assembly, a gas supply pipeline and at least one gas blowing pipe, the fusion welding assembly is used for enabling an insulating film and a top cover outside a naked battery cell to form a fusion welding point, the gas supply pipeline is used for being connected with gas supply equipment, the gas blowing pipe is communicated with the gas supply pipeline, and the gas outlet end of the gas blowing pipe is used for enabling gas flow to flow to the fusion welding point. According to the technical scheme provided by the invention, during use, the fusion welding assembly can form a fusion welding point between the insulating film and the top cover of the naked battery cell, meanwhile, the gas supply pipeline of the welding equipment can be connected with gas supply equipment, and gas flow provided by the gas supply equipment can be transmitted to the fusion welding point through the gas supply pipeline and the gas blowing pipe; and the air flow can flow to the welding point to realize rapid cooling. The welding defects such as hot-melting wiredrawing, hot-melting desoldering and hot-melting pseudo soldering are effectively reduced, the welding quality is improved, the welding period is shortened, and the production efficiency of welding equipment is improved.

Description

Technical Field

[0001] This application relates to the technical field of welding processing, and particularly relates to a welding device and a blowing structure. Background Art

[0002] In the process of manufacturing lithium batteries, an insulating film (such as MYLAR film) that wraps the bare battery cell needs to be hot melt welded to the top cover outside the bare battery cell to ensure the insulation and structural stability of the battery during operation. However, in practical applications of existing hot melt welding technologies, if the melting points of the insulating film are not sufficiently cooled, problems such as hot melt wire drawing, hot melt welding detachment, and hot melt virtual welding are likely to occur, affecting the quality and production efficiency of the batteries. Summary of the Utility Model

[0003] The main objective of this application is to propose a welding device and a blowing structure, aiming to solve the problems of poor quality and low efficiency in the hot melt welding of insulating films during the existing battery manufacturing process.

[0004] To achieve the above objective, the welding device proposed in this application includes a fusion welding component, a gas supply pipeline, at least one blowing pipe, and a first connection structure. The fusion welding component is used to form a melting point between the insulating film and the top cover outside the bare battery cell. The gas supply pipeline is used to connect to a gas supply device. The blowing pipe is communicated with the gas supply pipeline, and the air outlet end of the blowing pipe is used to direct the air flow towards the melting point. The first connection structure is connected to the fusion welding component. An air flow channel is provided on the first connection structure, and the gas supply pipeline, the air flow channel, and the blowing pipe are communicated in sequence.

[0005] When the welding device provided in this application is in use, the fusion welding component can form a melting point between the insulating film and the top cover of the bare battery cell. At the same time, the gas supply pipeline of the welding device can be connected to a gas supply device, and the air flow provided by the gas supply device can be transmitted to the melting point through the gas supply pipeline and the blowing pipe, enabling the air flow to flow towards the melting point for rapid cooling. Specifically, the gas supply pipeline and the blowing pipe are interconnected, and the air outlet end of the blowing pipe is used to direct the air flow towards the melting point. During and after the welding process, the cooling air flow provided by the blowing pipe is used to rapidly cool the melting point, thereby effectively reducing the occurrence of welding defects such as hot melt wire drawing, hot melt welding detachment, and hot melt virtual welding, and improving the welding quality. The welding device integrates the gas supply pipeline and the blowing pipe through the air flow channel of the first connection structure, and the air flow channel on the first connection structure ensures that the cooling air flow can be efficiently transported to the melting point via the gas supply pipeline and the blowing pipe, thereby achieving rapid cooling. In addition, due to the effect of the cooling air flow, the cooling time of the melting point is shortened, thereby shortening the overall welding cycle and improving the production efficiency of the welding device.

[0006] In one embodiment, the welding device includes at least two blow pipes arranged at intervals, each of the blow pipes is respectively connected to the air supply pipeline, and the air outlet ends of each of the blow pipes are respectively used to make the air flow towards different welding points.

[0007] By providing a plurality of blow pipes, the welding device can enable each welding point to obtain independent cooling air flow through an independent blow pipe; the air flow can enter each blow pipe through the air supply pipeline and blow from the air outlet end of the blow pipe towards the corresponding welding point, achieving rapid cooling, so that the welding device can cool a plurality of welding points simultaneously, thereby improving the overall efficiency and quality of welding.

[0008] In one embodiment, the first connection structure is provided with a first side surface, a second side surface and at least one first connection hole, the first side surface and the second side surface are located on opposite sides of the first connection structure; the first connection hole penetrates from the first side surface to the second side surface to form the air flow channel; the air outlet end of the air supply pipeline is connected to one end of the first connection hole, and the air inlet end of the blow pipe is connected to the other end of the first connection hole.

[0009] The welding device realizes the connection of the air supply pipeline and the blow pipe by providing a first connection hole on the first connection structure, avoiding complex pipeline layouts, reducing the complexity of the device, ensuring the stability of the air flow during transportation, and improving the reliability of the device.

[0010] In one embodiment, the air outlet end of the air supply pipeline is detachably connected to one end of the first connection hole; and / or,

[0011] The air inlet end of the blow pipe is detachably connected to the other end of the first connection hole.

[0012] The welding device connects the air outlet end of the air supply pipeline to one end of the first connection hole in a detachable manner, and / or connects the air inlet end of the blow pipe to the other end of the first connection hole in a detachable manner, so as to facilitate the quick disassembly and assembly of the air supply pipeline and the blow pipe according to actual needs, without the need for complex disassembly or reassembly of the entire welding device, reducing the downtime of the device, improving production efficiency, and reducing maintenance costs.

[0013] In one embodiment, the first connection structure is further provided with a third side surface, the third side surface intersects with the first side surface and the second side surface respectively; at least one second connection hole is provided on the third side surface; the welding device further includes a fastener, and the fastener is used to pass through the second connection hole and connect with the fusion welding assembly.

[0014] By providing at least one second connection hole on the third side surface of the welding device and using fasteners for threaded connection with the fusion welding assembly, the first connection structure can be firmly fixed on the fusion welding assembly, enhancing the stability of the entire welding device and reducing component loosening caused by vibration or external forces during the welding process. Additionally, the first connection structure not only connects the gas supply pipeline and the blowpipe but also is connected to the fusion welding assembly through fasteners, improving the compactness of the device.

[0015] In one embodiment, the welding device further includes a moving mechanism, which is connected to the first connection structure and is used to drive the fusion welding assembly and the gas supply pipeline to move in the horizontal or vertical direction.

[0016] After the moving mechanism is connected to the first side surface of the first connection structure, the moving mechanism can directly drive the first connection structure and the fusion welding assembly and the gas supply pipeline on the first connection structure to move; the moving mechanism can move in the horizontal or vertical direction, thereby being able to change the positions of the fusion welding assembly and the gas supply pipeline, and further enabling the welding device to adapt to different welding positions while ensuring that the air flow can accurately blow towards the welding point.

[0017] In one embodiment, the welding device further includes at least one second connection structure, one end of which is connected to the first connection structure and the other end of which is connected to the moving mechanism.

[0018] As an intermediate connector between the first connection structure and the moving mechanism, the second connection structure can provide additional support, reduce vibration and sway during the movement of the fusion welding assembly, ensure the smoothness of the welding process, and thus improve the welding quality.

[0019] In one embodiment, one end of the second connection structure is detachably connected to the first connection structure, and the other end of the second connection structure is detachably connected to the moving mechanism, making the maintenance and component replacement of the device more convenient, reducing the device downtime and maintenance costs; at the same time, users can quickly replace second connection structures of different specifications according to the requirements of the welding process without large-scale modification of the device, improving the versatility and adaptability of the device.

[0020] One end of the second connection structure is connected to the first connection structure in a detachable manner, and the other end of the second connection structure is connected to the moving mechanism in a detachable manner, making the maintenance and component replacement of the device more convenient and reducing the device downtime and maintenance costs.

[0021] In one embodiment, the fusion welding assembly includes at least one welding head, which is connected to the first connection structure.

[0022] The welding head included in the fusion welding assembly is capable of completing the fusion welding operation of the insulating film and the top cover of the bare battery cell. The welding head is connected to the first connection structure, enabling the welding head to work in cooperation with the gas supply pipeline and the blow pipe; that is, during the welding process and after the welding head completes the fusion welding operation, the air flow can flow through the gas supply pipeline, the first connection structure, and the blow pipe to the fusion point, and the welding head can move with the first connection structure, facilitating rapid cooling.

[0023] In one embodiment, the fusion welding assembly includes a third connection structure and at least two of the welding heads, and at least two of the welding heads are respectively connected to the third connection structure, and the welding heads are spaced apart from each other.

[0024] Multiple welding heads are respectively connected to the third connection structure, and the welding heads are spaced apart from each other, enabling the welding equipment to simultaneously form multiple fusion points, improving the welding efficiency; the third connection structure can connect multiple welding heads, thereby providing a supporting function for the welding heads and ensuring the stability of the welding heads during the welding process.

[0025] In one embodiment, the outlet end of the blow pipe forms a spacing greater than or equal to 5 mm and less than or equal to 10 mm with the fusion point.

[0026] By making the outlet end of the blow pipe form a spacing greater than or equal to 5 mm and less than or equal to 10 mm with the fusion point, the welding equipment ensures that the air flow can effectively cover the fusion point, while avoiding excessive air flow impact due to too close a distance or insufficient cooling effect due to too far a distance.

[0027] In one embodiment, the blow pipe includes a main body portion and a bent portion, the main body portion extends along the length direction of the welding head, the bent portion is used to bend relative to the main body portion and face the side surface of the welding head, and the outlet end of the blow pipe is used to make the air flow flow along the side surface of the welding head to the fusion point.

[0028] The welding equipment makes the main body portion of the blow pipe extend along the direction of the welding head towards the bare battery cell, and the bent portion of the blow pipe is used to bend relative to the main body portion and face the side surface of the welding head, enabling the outlet end of the blow pipe to flexibly adjust its orientation according to the position and angle of the welding head, ensuring that the air flow can accurately act on the fusion point.

[0029] In one embodiment, the blow pipe is made of a bendable flexible material.

[0030] Since the blow pipe is made of a bendable flexible material, the blow pipe can adjust its direction and angle according to the specific position of the fusion point during the welding process, thereby facilitating the alignment of the outlet end with the fusion point and improving the versatility and adaptability of the welding equipment.

[0031] In one embodiment, the blowpipe includes at least two interconnected pipe section structures. The pipe section structure at the head end is connected to the first connection structure, and adjacent pipe section structures can be bent relative to each other.

[0032] Adjacent pipe sections can be bent relative to each other. The blowpipe can flexibly adjust its shape and direction according to welding requirements, so that it can adapt to different welding positions and angles during the welding process, ensuring that the air flow can accurately blow towards the fusion point.

[0033] In one embodiment, the welding device further includes a nozzle structure having an air inlet and an air outlet. The air inlet of the nozzle structure is connected to the air outlet end of the blowpipe, and the width of the cross-section of the nozzle structure increases or decreases in the direction from the air inlet to the air outlet.

[0034] By adding a nozzle structure, the welding device further optimizes the air flow path and distribution. Among them, the nozzle structure has an air inlet and an air outlet, and the width of its cross-section gradually increases or decreases in the direction from the air inlet to the air outlet. It can change the air flow speed and distribution according to the size and shape of the fusion point, ensuring that the air flow can act on the fusion point efficiently and achieving a fast and uniform cooling effect.

[0035] In one embodiment, when the air outlet of the nozzle structure is a circular opening, the diameter of the air outlet is greater than or equal to 3 mm and less than or equal to 10 mm; and / or when the air outlet of the nozzle structure is a rectangular opening, the length of the cross-section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, the width of the cross-section of the air outlet is greater than or equal to 2 mm and less than or equal to 5 mm; or, the length of the cross-section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, the width of the cross-section of the air outlet is greater than or equal to 6 mm and less than or equal to 10 mm.

[0036] When the air outlet of the nozzle structure is a circular opening, its diameter is greater than or equal to 3 mm and less than or equal to 10 mm, so that the nozzle structure is suitable for the rapid cooling of small-area fusion points; when the air outlet of the nozzle structure is a rectangular opening, the length of the cross-section is greater than or equal to 10 mm and less than or equal to 30 mm, and the cross-section width is divided into two cases, greater than or equal to 2 mm and less than or equal to 5 mm and greater than or equal to 6 mm and less than or equal to 10 mm, so as to be suitable for the uniform cooling of large-area fusion points respectively. The welding device can adapt to different welding requirements and the shapes of different fusion points by making the air outlet of the nozzle structure have a specific size range.

[0037] The present application also provides a blowing structure, which is applied to the above-mentioned welding equipment. The blowing structure includes a gas supply pipeline, at least one blowing pipe, and a first connection structure. The gas supply pipeline is used to connect a gas supply device; the blowing pipe is communicated with the gas supply pipeline, and the air outlet end of the blowing pipe is used to direct the air flow towards the welding point formed by the insulating film and the top cover of the bare battery cell; the first connection structure is used to connect with the fusion welding assembly; an air flow channel is provided on the first connection structure, and the gas supply pipeline, the air flow channel, and the blowing pipe are communicated in sequence.

[0038] When the blowing structure provided by the present application is in use, the gas supply pipeline can be connected to the gas supply device, and the air flow provided by the gas supply device can be transmitted to the welding point through the gas supply pipeline and the blowing pipe, so that the air flow can flow towards the welding point to achieve rapid cooling. Specifically, the gas supply pipeline and the blowing pipe are communicated with each other, and the air outlet end of the blowing pipe is used to direct the air flow towards the welding point. During and after the welding process, the cooling air flow provided by the blowing pipe is used to rapidly cool the welding point, thereby effectively reducing the occurrence of welding defects such as hot melt wire drawing, hot melt welding detachment, and hot melt virtual welding, and improving the welding quality. The welding equipment integrates the gas supply pipeline and the blowing pipe through the air flow channel of the first connection structure, and the air flow channel on the first connection structure ensures that the cooling air flow can be efficiently transported to the welding point through the gas supply pipeline and the blowing pipe, so as to achieve rapid cooling. In addition, due to the action of the cooling air flow, the cooling time of the welding point is shortened, thereby shortening the overall welding cycle and improving the production efficiency of the welding equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0040] Figure 1 It is a schematic structural diagram of an embodiment of the welding equipment provided by the present application;

[0041] Figure 2 For Figure 1 the partial enlarged view at A in

[0042] Figure 3 It is a schematic structural diagram of the gas supply pipeline and the blowing pipe of an embodiment of the welding equipment provided by the present application;

[0043] Figure 4 It is a schematic structural diagram of the gas supply pipeline and the blowing pipe of an embodiment of the welding equipment provided by the present application from another perspective;

[0044] Figure 5 Partial structural schematic diagram of the blowpipe in an embodiment of the welding device provided by this application.

[0045] Explanation of the reference numerals in the drawings:

[0046] 1. Fusion welding assembly; 11. Welding head; 12. Third connection structure; 2. Gas supply pipeline; 21. Connection section; 3. Blowpipe; 31. Main body part; 32. Bent part; 33. Pipe section structure; 4. First connection structure; 41. First side surface; 42. Second side surface; 43. Third side surface; 5. Moving mechanism; 6. Second connection structure; 7. Nozzle structure; 8. Bare battery cell; 9. Top cover.

[0047] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0048] Next, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0049] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0050] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of this application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0051] In the manufacturing process of lithium batteries, the insulating film (such as MYLAR film, Mylar film) that wraps the bare cell needs to be hot-melt welded to the top cover outside the bare cell to ensure the insulation and structural stability of the battery during operation. However, in actual applications of existing hot-melt welding technology, if the welding point of the insulating film is not fully cooled, it is easy to cause problems such as hot-melt wire drawing, hot-melt desoldering, and hot-melt cold welding at the welding point, which affects the quality and production efficiency of the battery.

[0052] Therefore, based on the above considerations, in order to solve the problems of poor quality and low efficiency of hot-melt welding of insulating films in the manufacturing process of existing lithium batteries, the present application proposes a welding device. In the manufacturing process of lithium batteries, the existing hot-melt welding technology often leads to unstable welding quality due to slow cooling speed and uneven cooling of the fusion point, which affects the performance of the battery. Therefore, the welding equipment forms a fusion point on the insulating film and the top cover of the bare battery cell by using a fusion welding assembly, and cooperates with the additional air supply pipeline and air blow pipe to form an air flow at the fusion point provided by the air supply equipment, which can quickly take away the heat generated by the fusion point, so that the fusion point can be fully cooled in a short time, avoiding problems such as hot-melt wiredrawing, hot-melt desoldering, and hot-melt cold welding due to insufficient cooling, thereby improving the welding quality, shortening the welding cycle, and improving the production efficiency of the equipment.

[0053] Next, the structure of the welding device proposed in this application is explained with a specific embodiment. In one embodiment of this application, please refer to Figure 1 and Figure 2 The welding equipment proposed in this application includes a fusion welding component 1, an air supply pipeline 2 and at least one air blowing pipe 3. The fusion welding component 1 is used to form a welding point between the insulating film and the top cover 9 of the bare battery cell 8; the air supply pipeline 2 is used to connect the air supply equipment; the air blowing pipe 3 is connected to the air supply pipeline 2, and the air outlet end of the air blowing pipe 3 is used to make the air flow flow to the welding point.

[0054] Among them, the insulating film is a thin film coated on the outer surface of the bare battery cell 8 and is usually made of polymer materials. The polymer materials can be polypropylene (PP), polyurethane (PU), polyester film (PET), etc. For example, the insulating film can use MYLAR film, which is a polyester film. The MYLAR film has a high dielectric strength and can effectively prevent current leakage. The main function of the insulating film is to protect the bare battery cell 8 inside the battery from damage by the external environment and at the same time prevent a short circuit between the bare battery cell 8 and the battery housing. Among them, a housing is provided outside the bare battery cell 8, and the above-mentioned top cover 9 belongs to a part of the housing structure and is located at the top of the bare battery cell 8. Since there is a potential difference between the positive and negative electrodes of the bare battery cell 8 and the metal top cover 9, if the bare battery cell 8 is in direct contact with the metal top cover 9, it may cause a short circuit, resulting in overheating, fire or even explosion of the bare battery cell 8. Therefore, by coating the insulating film on the outer surface of the bare battery cell 8 and connecting the positive and negative electrode tabs of the bare battery cell 8 to the positive and negative electrode posts on the top cover 9, direct contact between the bare battery cell 8 and the metal top cover 9 can be prevented, avoiding the occurrence of a short circuit. In addition, by thermally welding the top of the insulating film to the top cover 9, the insulating film is prevented from falling off during the use of the battery. In addition, by using the welding assembly 1, the insulating film and the top cover 9 of the bare battery cell 8 form a welding point, which is a form of welding. Specifically, the insulating film is locally melted by heating with the welding assembly 1, and the locally melted material forms a welding point on the top cover 9. After the welding point cools, a firm joint is formed, thereby connecting the insulating film and the top cover 9 together.

[0055] It should be noted that the blow pipe 3 can be made of a plastic material that can withstand temperatures above 200°C, so that the blow pipe 3 can still deliver cooling gas to the welding point when the welding assembly 1 is in a heated state. Among them, the plastic material that can withstand temperatures above 200°C can use polyether ether ketone, polyphenylene sulfide or polyimide. In addition, the diameter of the blow pipe 3 ranges from greater than or equal to 10 mm to less than or equal to 15 mm to ensure that the delivery flow rate of the cooling gas during the welding process of the blow pipe 3 is within a preset range and at the same time adapts to cooling the welding point of a specific size area.

[0056] The fusion welding assembly 1 can form a fusion joint between the insulating film and the top cover 9 of the bare battery cell 8. At the same time, the gas supply pipeline 2 of the welding equipment can be connected to the gas supply equipment, and the air flow provided by the gas supply equipment can be transmitted to the fusion joint through the gas supply pipeline 2 and the blow pipe 3, so that the air flow can flow to the fusion joint to achieve rapid cooling. Specifically, the gas supply pipeline 2 and the blow pipe 3 are interconnected, and the air outlet end of the blow pipe 3 is used to make the air flow flow to the fusion joint. During and after the welding process, the cooling air flow provided by the blow pipe 3 is used to rapidly cool the fusion joint, which can effectively reduce the occurrence of welding defects such as hot melt wire drawing, hot melt welding detachment, and hot melt virtual welding, and improve the welding quality. In addition, due to the action of the cooling air flow, the cooling time of the fusion joint is shortened, thereby shortening the overall welding cycle and improving the production efficiency of the welding equipment.

[0057] Please refer to Figure 3 , in an embodiment of the present application, the gas supply pipeline 2 may further include a gas valve, and the gas valve is arranged on the gas supply pipeline. During the welding process, by controlling the gas valve, the gas supply pipeline 2 can be quickly opened or closed, realizing the instant supply and stop of the cooling gas, avoiding gas waste, and improving the utilization rate of the gas. In addition, by adjusting the opening and closing degree of the gas valve, the flow rate of the cooling gas transported by the gas supply pipeline 2 to the blow pipe 3 can be controlled, and the output amount of the cold air flowing from the blow pipe 3 to the fusion joint can be controlled within a preset range, so as to ensure both shortening the cooling cycle of the fusion joint and avoiding blowing away the unfrozen molten material and affecting the welding quality.

[0058] Please refer to Figure 1 and Figure 3 , in an embodiment of the present application, the welding equipment includes at least two blow pipes 3 arranged at intervals, and each blow pipe 3 is respectively connected to the gas supply pipeline 2, and the air outlet ends of each blow pipe 3 are respectively used to make the air flow flow to different fusion joints. Among them, one side surface of the bare battery cell 8 along the length direction abuts against the top cover, and at least two blow pipes 3 can be arranged at intervals along the length direction of the bare battery cell 8. The gas supply pipeline can be provided with at least two connection segments 21, and one end of each blow pipe 3 is respectively connected to each connection segment 21 of the gas supply pipeline 2. For example, the internal thread structure of the connection segment 21 can be threadedly connected to the external thread structure at one end of the blow pipe 3; or the blow pipe 3 and the connection segment 21 can be connected together through a flange and bolts; or one blow pipe 3 can be inserted into the socket of another connection segment 21, and sealed through a sealing ring or filling material; or the blow pipe 3 and the connection segment 21 can be bonded together through glue or a special adhesive.

[0059] In this embodiment, the welding device is provided with at least two blowing pipes 3, so that different welding points can obtain independent cooling airflows through independent blowing pipes; the airflows can enter each blowing pipe 3 through the air supply pipeline 2 and flow from the air outlet end of the blowing pipe 3 to the corresponding welding point, achieving a rapid cooling effect; thus enabling the welding device to cool at least two welding points simultaneously, thereby improving the overall efficiency and quality of welding.

[0060] Please refer to Figure 1 and Figure 2 , in an embodiment of the present application, the welding device further includes a first connection structure 4, and the first connection structure 4 is connected to the fusion welding assembly 1; an air flow channel is provided on the first connection structure 4, and the air supply pipeline 2, the air flow channel and the blowing pipe 3 are connected in sequence. The first connection structure 4 extends along the length direction of the bare battery cell 8, and at least two air flow channels are provided on the first connection structure 4, and the number of air flow channels corresponds to the number of blowing pipes 3. Among them, the air flow channel can be a straight channel. On the first connection structure 4, there are a first side surface 41, a second side surface 42 and at least one first connection hole. The first side surface 41 and the second side surface 42 are located on opposite sides of the first connection structure 4; the first connection hole penetrates from the first side surface 41 of the first connection structure 4 to the second side surface 42 to form an air flow channel, enabling the gas to pass through the first connection structure 4 along the shortest path. The air outlet end of the air supply pipeline 2 is connected to one end of the first connection hole, and the air inlet end of the blowing pipe 3 is connected to the other end of the first connection hole. Of course, the air flow channel can also be a curved channel with a certain curvature, and the air flow channel can also be a tapered channel that gradually decreases or increases from the inlet to the outlet, as long as it ensures that the gas in the air supply pipeline 2 can flow through the air flow channel to the blowing pipe 3.

[0061] In this embodiment, the welding device integrates the gas supply pipeline 2 and the blow pipe 3 through the air flow channel of the first connection structure 4. The air flow channel on the first connection structure 4 ensures that the cooling air flow can be efficiently transported to the welding point via the gas supply pipeline 2 and the blow pipe 3, thus achieving rapid cooling. Specifically, the air flow channel is arranged on the first connection structure 4, and the gas supply pipeline 2 is connected to the blow pipe 3 through this air flow channel to form a complete air flow transportation path. The air flow enters the air flow channel from the gas supply pipeline 2 and then flows to the welding point through the air outlet end of the blow pipe 3, capable of rapidly cooling the welding point. Therefore, the air flow channel on the first connection structure 4 ensures that the cooling air flow can be efficiently and accurately transported to the corresponding welding point via the gas supply pipeline 2, the air flow channel, and the blow pipe 3, thereby achieving a rapid and uniform cooling effect, reducing air flow loss and delay, ensuring that the welding point can be rapidly cooled, and thus improving the welding efficiency. Therefore, the air outlet end of the gas supply pipeline 2 is connected to one end of the first connection hole, and the air inlet end of the blow pipe 3 is connected to the other end of the first connection hole, which can avoid adding complex pipeline layouts and additional connection components, reduce the complexity of the overall structure, ensure the stability of the air flow during transportation, and improve the reliability of the welding device.

[0062] In addition, by providing the first connection hole on the first connection structure 4, the welding device not only realizes the connection between the gas supply pipeline 2 and the blow pipe 3, but also avoids complex pipeline layouts, reduces the complexity of the device, ensures the stability of the air flow during transportation, and improves the reliability of the device. Specifically, the first connection structure 4 has a first side surface 41 and a second side surface 42. The first side surface 41 and the second side surface 42 are located on opposite sides of the first connection structure 4. Both ends of the first connection hole penetrate through the first side surface 41 and the second side surface 42 of the first connection structure 4, so that the first connection hole connects the gas supply pipeline 2 and the blow pipe 3, which can not only shorten the gas transmission path, achieve rapid and efficient gas transmission, but also reduce the processing difficulty of the air flow channel.

[0063] Please refer to Figure 3 and Figure 4, in an embodiment of the present application, the outlet end of the air supply pipeline 2 is detachably connected to one end of the first connection hole, and / or the inlet end of the blow pipe 3 is detachably connected to the other end of the first connection hole. For example, the outlet end of the air supply pipeline 2 may be provided with a first external thread structure, and one end of the first connection hole may be provided with a first internal thread structure. By using the cooperation of the first external thread structure and the first internal thread structure, the outlet end of the air supply pipeline 2 can be screwed into the first connection hole; similarly, the inlet end of the blow pipe 3 may be provided with a second external thread structure, and the other end of the first connection hole may be provided with a second internal thread structure. By using the cooperation of the second external thread structure and the second internal thread structure, the inlet end of the blow pipe 3 can be screwed into the first connection hole; of course, the outlet end of the air supply pipeline 2 may also be connected to one end of the first connection hole by a buckle, and the inlet end of the blow pipe 3 may also be connected to the other end of the first connection hole by a buckle.

[0064] In this embodiment, the welding equipment detachably connects the outlet end of the air supply pipeline 2 to one end of the first connection hole, and / or detachably connects the inlet end of the blow pipe 3 to the other end of the first connection hole, so that the air supply pipeline 2 and the blow pipe 3 can be more conveniently connected to or separated from the first connection structure 4, facilitating the quick disassembly and assembly of the air supply pipeline 2 and the blow pipe 3 according to actual needs, without the need for complex disassembly or reassembly of the entire welding equipment, reducing the downtime of the equipment, improving production efficiency, and reducing maintenance costs. In addition, a sealing structure is provided at the connection between the first connection hole and the air supply pipeline 2 and the blow pipe 3; the sealing structure may include a sealing ring or a sealing glue layer, and the sealing structure can effectively prevent air leakage from the connection between the first connection hole and the air supply pipeline 2 and the blow pipe 3, ensuring that the air flow can efficiently flow to the welding point and improving the cooling efficiency. It should be noted that a sealing groove may be provided on the inner wall of the first connection hole. When connecting the air supply pipeline 2 and the blow pipe 3, the sealing structure is installed in the sealing groove of the first connection hole, and a part of the sealing structure protrudes from the opening of the sealing groove, so as to ensure that the sealing structure can fully play its sealing role.

[0065] Please refer to Figure 1 and Figure 4 , in an embodiment of the present application, a third side surface 43 is further provided on the first connection structure 4, and the third side surface 43 intersects with the first side surface 41 and the second side surface 42 respectively; at least one second connection hole is provided on the third side surface 43; the welding equipment further includes a fastener for passing through the second connection hole and connecting with the fusion welding assembly 1.

[0066] In this embodiment, a first connecting structure 4 is provided with a first side surface 41, a second side surface 42 and a third side surface 43. A first connecting hole penetrates through the first side surface 41 and the second side surface 42 of the first connecting structure 4. The third side surface 43 intersects with the first side surface 41 and the second side surface 42 respectively, that is, the third side surface 43 is parallel to the axial direction of the first connecting hole. At least one second connecting hole is provided on the third side surface 43, and fasteners such as bolts, screws, rivets, etc. can be used to connect with the welding assembly 1, so that the first connecting structure 4 can be installed on the welding assembly 1, so as to realize the quick disassembly and assembly of the air supply pipeline 2 and the blowing pipeline 3 by quickly disassembling and assembling the first connecting structure 4. Therefore, the first connecting structure 4 is not only used to connect the air supply pipeline 2 and the blowing pipeline 3, but also can be connected to the welding assembly 1 through fasteners, so that the air supply pipeline 2 and the blowing pipeline 3 can always maintain synchronous movement with the welding assembly 1, which not only ensures that the air flow can accurately flow to the welding point, but also improves the compactness of the welding equipment.

[0067] Please refer to Figure 1 and Figure 2 , in an embodiment of the present application, the welding equipment further includes a moving mechanism 5. The moving mechanism 5 is connected to the first connecting structure 4, and the moving mechanism 5 is used to drive the welding assembly 1 and the air supply pipeline 2 to move in the horizontal direction or the vertical direction. Among them, a third connecting hole can be provided on the first side surface 41 of the first connecting structure 4, so that fasteners such as bolts, screws, rivets, etc. can be used to connect with the moving mechanism 5; of course, the first connecting structure 4 can be fixedly connected to the moving mechanism 5 by welding; in addition, the moving mechanism 5 can adopt a robotic arm.

[0068] In this embodiment, after the moving mechanism 5 is connected to the first connecting structure 4, the moving mechanism 5 can directly drive the first connecting structure 4 and the welding assembly 1 and the air supply pipeline 2 on the first connecting structure 4 to move; among them, the moving mechanism 5 can move in the horizontal direction or the vertical direction, so as to be able to change the positions of the welding assembly 1 and the air supply pipeline 2, and further enable the welding equipment to adapt to the welding requirements of different welding positions, improving the welding accuracy and welding quality; in addition, driven by the moving mechanism 5, the welding assembly 1 can be accurately aligned with the preset welding position, and at the same time, the air supply pipeline 2 and the blowing pipeline 3 can always maintain synchronous movement with the welding assembly 1, ensuring that the air flow can accurately flow to the welding point.

[0069] Please refer to Figure 1 and Figure 2, in an embodiment of the present application, the welding device further includes at least one second connection structure 6. One end of the second connection structure 6 is connected to the first connection structure 4, and the other end of the second connection structure 6 is connected to the moving mechanism 5. One end of the second connection structure 6 is detachably connected to the first connection structure 4 by fasteners such as bolts, screws, and rivets, and the other end of the second connection structure 6 is detachably connected to the moving mechanism 5 by fasteners such as bolts, screws, and rivets.

[0070] In this embodiment, the second connection structure 6 serves as an intermediate connecting member between the first connection structure 4 and the moving mechanism 5, which can provide additional support, reduce the vibration and sway during the movement of the fusion welding assembly 1, ensure the smoothness of the welding process, and thus improve the welding quality. One end of the second connection structure 6 is connected to the first connection structure 4, and the other end of the second connection structure 6 is connected to the moving mechanism 5, enabling the moving mechanism 5 to drive the first connection structure 4 and the fusion welding assembly 1 and the gas supply pipeline 2 connected to the first connection structure 4 to move through the second connection structure 6. As an intermediate connecting member, the second connection structure 6 can provide additional support and stability, reduce the vibration and sway during the movement of the fusion welding assembly 1, ensure the smoothness of the welding process, and thus improve the welding quality. Specifically, the second connection structure 6 can adopt a rigid connecting member, such as a metal rod or plate; or the second connection structure 6 can also adopt a flexible connecting member, such as a telescopic arm. In addition, the connection between one end of the second connection structure 6 and the first connection structure 4 is made in a detachable connection manner, and the connection between the other end of the second connection structure 6 and the moving mechanism 5 is also made in a detachable connection manner, which can ensure the connection flexibility and convenience between the second connection structure 6 and the moving mechanism, make the maintenance and component replacement of the device more convenient, reduce the device downtime and maintenance cost, and there is no need to perform complex disassembly or reassembly on the entire welding device.

[0071] Please refer to Figure 1 and Figure 2 , in an embodiment of the present application, the fusion welding assembly 1 includes at least one welding head 11, and the welding head 11 is connected to the first connection structure 4. Among them, the welding head 11 is located above the bare battery cell 8, the heating end of the welding head 11 faces the abutting portion between the bare battery cell 8 and the top cover 9, and the welding head 11 and the first connection structure 4 can be detachably connected by fasteners such as bolts, screws, and rivets.

[0072] In this embodiment, the welding head 11 included in the fusion welding assembly 1 can complete the fusion welding operation of the insulating film and the top cover 9 of the bare battery cell 8. The welding head 11 is connected to the first connection structure 4, enabling the welding head 11 to work in coordination with the gas supply pipeline 2 and the blow pipe 3; that is, during the welding process and after the welding head 11 completes the fusion welding operation, the air flow can flow through the gas supply pipeline 2, the first connection structure 4, and the blow pipe 3 to the fusion point, and the welding head 11 can also move with the first connection structure 4, facilitating rapid cooling.

[0073] Please refer to Figure 1 and Figure 2 , in an embodiment of the present application, the fusion welding assembly 1 includes a third connection structure 12 and at least two welding heads 11. The at least two welding heads 11 are respectively connected to the third connection structure 12, and the welding heads 11 are arranged at intervals. Among them, the at least two welding heads 11 are arranged at intervals along the length direction of the bare battery cell 8 on the third connection structure 12.

[0074] In this embodiment, the at least two welding heads 11 are respectively connected to the third connection structure 12 and are arranged at intervals, enabling the welding equipment to simultaneously form at least two fusion points, improving the welding efficiency; the third connection structure 12 can connect multiple welding heads 11, thereby providing a supporting function for the welding heads 11 and ensuring the stability of the welding heads 11 during the welding process. The third connection structure 12 can provide the functions of mechanical support and positioning for the welding heads 11, ensuring the stability of the welding heads 11 during the welding process. Specifically, the third connection structure 12 can adopt a rigid connecting member, such as a metal rod or a metal plate member.

[0075] Please refer to Figure 3 and Figure 4 , in an embodiment of the present application, the blow pipe 3 is made of a bendable flexible material.

[0076] In this embodiment, since the blow pipe 3 is made of a bendable flexible material, the blow pipe 3 can adjust its direction and angle according to the specific position of the fusion point during the welding process, thereby facilitating the alignment of the air outlet end with the fusion point and improving the versatility and adaptability of the welding equipment. Among them, the flexible material can specifically be made of flexible plastics, rubber, or silica gel and other materials with good bending properties, so as to be able to change its shape under the action of external force while maintaining the smooth flow of the air flow.

[0077] Please refer to Figure 3 , in an embodiment of the present application, the blow pipe 3 includes at least two interconnected pipe section structures 33. The pipe section structure 33 at the head end is connected to the first connection structure 4, and the adjacent pipe section structures 33 can be bent relative to each other.

[0078] In this embodiment, adjacent pipe section structures 33 can be bent relative to each other, enabling the blowing pipe 3 to flexibly adjust its shape and blowing direction according to welding requirements. As a result, the blowing pipe 3 can adapt to different welding positions and angles during the welding process, ensuring that the air flow can accurately reach the fusion point. Exemplarily, the blowing pipe 3 includes at least two interconnected pipe section structures 33, and each pipe section structure 33 is connected by a flexible connector (such as a joint or flexible material). The pipe section structure 33 at the head end is connected to the first connection structure 4, enabling the blowing pipe 3 to be stably connected to the air supply pipeline 2. For example, the blowing pipe 3 can be a universal jointed pipe.

[0079] Please refer to Figure 1 and Figure 2 , in an embodiment of the present application, the outlet end of the blowing pipe 3 forms a spacing greater than or equal to 5 mm and less than or equal to 10 mm from the fusion point.

[0080] In this embodiment, the welding equipment ensures that the air flow can effectively cover the fusion point by forming a spacing greater than or equal to 5 mm and less than or equal to 10 mm between the outlet end of the blowing pipe 3 and the fusion point, while avoiding excessive air flow impact due to too close a distance or insufficient cooling effect due to too far a distance.

[0081] Please refer to Figure 1 and Figure 4 , in an embodiment of the present application, the blowing pipe 3 includes a main body portion 31 and a bent portion 32. The main body portion 31 extends along the direction of the welding head 11 towards the bare battery cell 8, and the bent portion 32 is used to bend relative to the main body portion 31 and towards the side surface of the welding head 11. The outlet end of the blowing pipe 3 is used to make the air flow along the side surface of the welding head 11 to the fusion point.

[0082] In this embodiment, the welding equipment provides a stable air flow channel by making the main body portion 31 of the blowing pipe 3 extend along the length direction of the welding head 11, thereby ensuring that the cooling gas can flow from the gas supply device to the welding area (i.e., the plane where the fusion point is located); while the bent portion 32 of the blowing pipe 3 is used to bend relative to the main body portion 31 and towards the side surface of the welding head 11, enabling the outlet end of the blowing pipe 3 to flexibly adjust its orientation according to the position and angle of the welding head 11, ensuring that the air flow can accurately act on the fusion point. Specifically, the outlet end of the blowing pipe 3 makes the air flow along the side surface of the welding head 11 to the fusion point, which can not only quickly cool the fusion point but also reduce the direct impact of the cooling gas on the fusion point, avoiding welding instability caused by air flow impact.

[0083] Please refer to Figures 3 to 5, in an embodiment of the present application, the welding device further includes a nozzle structure 7, and the nozzle structure 7 has an air inlet and an air outlet; the air inlet of the nozzle structure 7 is connected to the air outlet end of the blowpipe 3, and the width of the cross-section of the nozzle structure 7 increases or decreases in the direction from the air inlet to the air outlet. When the width of the cross-section of the nozzle structure 7 gradually decreases from the air inlet to the air outlet, the air flow velocity will increase, forming a concentrated and high-speed cooling air flow acting on the welding point, so that the nozzle structure 7 is suitable for the rapid cooling of small-area welding points; when the width of the cross-section of the nozzle structure 7 gradually increases from the air inlet to the air outlet, the air flow velocity will decrease, forming a dispersed and uniform cooling air flow acting on the welding point, so that the nozzle structure 7 is suitable for the uniform cooling of large-area welding points. The nozzle structure 7 is used to adjust the velocity and distribution of the air flow, ensuring that the cooling gas can act on the welding point efficiently, achieving a rapid and uniform cooling effect; the welding device can increase or decrease the width of the cross-section of the nozzle structure 7 in the direction from the air inlet to the air outlet according to different welding requirements, thereby improving the welding quality and production efficiency.

[0084] In this embodiment, the welding device changes the air flow path and air flow distribution acting on the welding point by adding a nozzle structure 7; wherein, the nozzle structure 7 has an air inlet and an air outlet, and the width of the internal cross-section of the nozzle structure 7 gradually increases or decreases in the direction from the air inlet to the air outlet, which can adjust the velocity and distribution of the air flow; exemplarily, according to the size and shape of the welding point, the width of the cross-section of the nozzle structure 7 can be increased or decreased in the direction from the air inlet to the air outlet, thereby changing the velocity and distribution of the air flow, ensuring that the air flow can act on the welding point efficiently, achieving a rapid and uniform cooling effect. Among them, the nozzle structure 7 is detachably connected to the air outlet end of the blowpipe 3, for example, connected by means of threaded connection and snap connection.

[0085] Please refer to Figure 4 and Figure 5 , in an embodiment of the present application, the air outlet of the nozzle structure 7 is set as a round opening, an oval opening, a rectangular opening or a rounded rectangular opening.

[0086] In this embodiment, the air outlet of the nozzle structure 7 can be set as a round opening, an oval opening, a rectangular opening and a rounded rectangular opening, so that the nozzle structure 7 can be suitable for specific welding requirements and the shape of the welding point. When the air outlet of the nozzle structure 7 is set as a round opening, it has the characteristics of concentrated air flow and strong impact force, so that the nozzle structure 7 is suitable for the rapid cooling of small-area welding points, can quickly take away heat, and reduce the heat affected zone. When the air outlet of the nozzle structure 7 is set as an oval opening, a rectangular opening or a rounded rectangular opening, the air flow distribution is wider than that of the round opening, which is suitable for the case where the welding point area has a certain width, can uniformly cool the welding point, and reduce welding defects. When the air outlet of the nozzle structure 7 is set as a rectangular opening, it has the characteristics of uniform air flow distribution and large air flow coverage area, which is suitable for large-area welding points.

[0087] Please refer to Figure 4 and Figure 5 , in an embodiment of the present application, when the air outlet of the nozzle structure 7 is set as a circular opening, the diameter of the air outlet is greater than or equal to 3 mm and less than or equal to 10 mm; and / or when the air outlet of the nozzle structure 7 is set as a rectangular opening, the length of the cross-section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, and the width of the cross-section of the air outlet is greater than or equal to 2 mm and less than or equal to 5 mm; or, the length of the cross-section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, and the width of the cross-section of the air outlet is greater than or equal to 6 mm and less than or equal to 10 mm.

[0088] In this embodiment, when the air outlet of the nozzle structure 7 is set as a circular opening, its diameter is greater than or equal to 3 mm and less than or equal to 10 mm, so that the nozzle structure is suitable for the rapid cooling of small-area welding points, for example, suitable for welding points with a width greater than 0 mm and less than or equal to 5 mm and a length greater than 0 mm and less than or equal to 5 mm; when the air outlet of the nozzle structure 7 is set as a rectangular opening, the length of the cross-section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, and the width of the cross-section is greater than or equal to 2 mm and less than or equal to 5 mm, so that it is suitable for welding points with a width greater than 0 mm and less than or equal to 5 mm and a length greater than 0 mm and less than or equal to 30 mm. In addition, when the air outlet of the nozzle structure 7 is set as a rectangular opening, the length of the cross-section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, and the width of the cross-section is greater than or equal to 6 mm and less than or equal to 10 mm, so that it is suitable for welding points with a width greater than 0 mm and less than or equal to 10 mm and a length greater than 0 mm and less than or equal to 30 mm; the welding equipment enables the air outlet of the nozzle structure 7 to have a specific size range to adapt to specific welding requirements and the shape of the welding points.

[0089] Please refer to Figures 1 to 4, in an embodiment of the present application, the welding device includes a fusion welding assembly 1, a gas supply pipeline 2, and at least one blowpipe 3. The fusion welding assembly 1 is used to form a fusion point between the insulating film and the top cover 9 of the bare battery cell 8; the gas supply pipeline 2 is used to connect to a gas supply device; the blowpipe 3 is communicated with the gas supply pipeline 2, and the air outlet end of the blowpipe 3 is used to make the air flow towards the fusion point; wherein, the welding device includes at least two blowpipes 3 arranged at intervals, each blowpipe 3 is respectively connected to the gas supply pipeline 2, and the air outlet ends of each blowpipe 3 are respectively used to make the air flow towards different fusion points; in addition, the welding device further includes a first connection structure 4, and the first connection structure 4 is connected to the fusion welding assembly 1; an air flow channel is provided on the first connection structure 4, and the gas supply pipeline 2, the air flow channel, and the blowpipe 3 are communicated in sequence; and the first connection structure 4 is provided with a first side surface 41, a second side surface 42, and at least one first connection hole. The first side surface 41 and the second side surface 42 are located on opposite sides of the first connection structure 4; the first connection hole penetrates from the first side surface 41 to the second side surface 42 to form the air flow channel; the air outlet end of the gas supply pipeline 2 is connected to one end of the first connection hole, and the air inlet end of the blowpipe 3 is connected to the other end of the first connection hole; at the same time, the air outlet end of the gas supply pipeline 2 is detachably connected to one end of the first connection hole, and / or the air inlet end of the blowpipe 3 is detachably connected to the other end of the first connection hole; a third side surface 43 is further provided on the first connection structure 4, and the third side surface 43 intersects with the first side surface 41 and the second side surface 42 respectively; at least one second connection hole is provided on the third side surface 43; the welding device further includes a fastener, and the fastener is used to pass through the second connection hole to be connected to the fusion welding assembly 1; in addition, the welding device further includes a moving mechanism 5, the moving mechanism 5 is connected to the first connection structure 4, and the moving mechanism 5 is used to drive the fusion welding assembly 1 and the gas supply pipeline 2 to move in the horizontal direction or the vertical direction; the welding device further includes at least one second connection structure 6, one end of the second connection structure 6 is connected to the first connection structure 4, and the other end of the second connection structure 6 is connected to the moving mechanism 5.Further, one end of the second connection structure 6 is detachably connected to the first connection structure 4, and the other end of the second connection structure 6 is detachably connected to the moving mechanism 5; further, the welding assembly 1 includes at least one welding head 11, and the welding head 11 is connected to the first connection structure 4; further, the welding assembly 1 includes a third connection structure 12 and at least two welding heads 11, and the at least two welding heads 11 are respectively connected to the third connection structure 12, and the at least two welding heads 11 are spaced apart; further, the blowpipe 3 is made of a bendable flexible material; further, the blowpipe 3 includes at least two interconnected pipe section structures, the pipe section structure at the head end is connected to the first connection structure 4, and adjacent pipe section structures can be bent relative to each other; further, the air outlet end of the blowpipe 3 forms a spacing of greater than or equal to 5 mm and less than or equal to 10 mm from the welding point; further, the blowpipe 3 includes a main body portion 31 and a bent portion 32, the main body portion 31 extends along the length direction of the welding head 11, the bent portion 32 is used to bend relative to the main body portion 31 and face the side surface of the welding head 11, and the air outlet end of the blowpipe 3 is used to make the air flow along the side surface of the welding head 11 to the welding point; further, the welding device further includes a nozzle structure 7, and the nozzle structure 7 has an air inlet and an air outlet; the air inlet of the nozzle structure 7 is connected to the air outlet end of the blowpipe 3, and the width of the cross-section of the nozzle structure 7 increases or decreases in the direction from the air inlet to the air outlet; further, the air outlet of the nozzle structure 7 is set as a circular opening, an elliptical opening, a rectangular opening or a rounded rectangular opening; further, when the air outlet of the nozzle structure 7 is set as a circular opening, the diameter of the air outlet is greater than or equal to 3 mm and less than or equal to 10 mm; and / or when the air outlet of the nozzle structure 7 is set as a rectangular opening, the length of the cross-section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, the width of the cross-section of the air outlet is greater than or equal to 2 mm and less than or equal to 5 mm; or, the length of the cross-section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, the width of the cross-section of the air outlet is greater than or equal to 6 mm and less than or equal to 10 mm.

[0090] The present application also proposes a blowing structure, and the blowing structure is applied to a welding device. The blowing structure includes a gas supply pipeline 2, a blowpipe 3 and a first connection structure 4. The specific structure of the blowing structure refers to the above embodiments. Since this blowing structure adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here. Among them, the gas supply pipeline 2 is used to connect a gas supply device; the blowpipe 3 is communicated with the gas supply pipeline 2, and the air outlet end of the blowpipe 3 is used to make the air flow to the welding point formed by the insulating film and the top cover 9 of the bare battery cell 8; the first connection structure 4 is used to connect with the welding assembly 1; an air flow channel is provided on the first connection structure 4, and the gas supply pipeline 2, the air flow channel and the blowpipe 3 are communicated in sequence.

[0091] The above are only exemplary embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A welding device, characterized in that: include: A fusion welding assembly, which is used to form a fusion point between the insulating film and the top cover outside the bare battery cell; A gas supply pipeline, the gas supply pipeline is used to connect the gas supply equipment; At least one air blowing pipe, the air blowing pipe is connected to the air supply pipeline, and the air outlet end of the air blowing pipe is used to make the air flow flow to the welding point; A first connecting structure is connected to the fusion welding assembly; an air flow channel is provided on the first connecting structure, and the air supply pipeline, the air flow channel and the air blowing pipe are connected in sequence.

2. The welding device according to claim 1, characterized in that The welding equipment comprises at least two air blowing pipes arranged at intervals, each of which is connected to the air supply pipeline respectively, and the air outlet end of each of the air blowing pipes is used to make the air flow flow to different welding points respectively.

3. The welding device according to claim 1, characterized in that The first connecting structure is provided with a first side surface, a second side surface and at least one first connecting hole, and the first side surface and the second side surface are located on opposite sides of the first connecting structure; the first connecting hole extends from the first side surface to the second side surface to form the air flow channel; the air outlet end of the air supply pipe is connected to one end of the first connecting hole, and the air inlet end of the air pipe is connected to the other end of the first connecting hole.

4. The welding device according to claim 3, characterized in that The air outlet end of the air supply pipeline is detachably connected to one end of the first connecting hole; and / or, the air inlet end of the air blowing pipe is detachably connected to the other end of the first connecting hole.

5. The welding device according to claim 3, characterized in that The first connecting structure is also provided with a third side surface, which intersects with the first side surface and the second side surface respectively, and at least one second connecting hole is provided on the third side surface; the welding equipment also includes a fastener, which is used to pass through the second connecting hole and connect with the fusion welding assembly.

6. The welding device according to claim 3, characterized in that The welding equipment further comprises a moving mechanism, which is connected to the first connecting structure and is used for driving the fusion welding assembly and the gas supply pipeline to move in a horizontal direction or a vertical direction.

7. The welding device according to claim 6, characterized in that The welding device further comprises at least one second connection structure, one end of the second connection structure is connected to the first connection structure, and the other end of the second connection structure is connected to the moving mechanism.

8. The welding device according to claim 7, characterized in that One end of the second connection structure is detachably connected to the first connection structure, and the other end of the second connection structure is detachably connected to the moving mechanism.

9. The welding device according to any one of claims 3 to 8, characterized in that The fusion welding assembly includes at least one welding head, and the welding head is connected to the first connecting structure.

10. The welding device according to claim 9, characterized in that The fusion welding assembly includes a third connection structure and at least two welding heads. The at least two welding heads are respectively connected to the third connection structure, and the welding heads are arranged at intervals.

11. The welding device according to claim 9, characterized in that The air outlet end of the air blowing pipe and the welding point form a distance greater than or equal to 5 mm and less than or equal to 10 mm.

12. The welding device according to claim 11, characterized in that The air blow pipe includes a main part and a bending part, the main part extends along the direction of the welding head toward the bare battery cell, the bending part is used to bend relative to the main part and toward the side surface of the welding head, and the air outlet end of the air blow pipe is used to make the air flow flow along the side surface of the welding head to the welding point.

13. The welding device according to any one of claims 3 to 8, characterized in that The air blowing tube is made of a bendable flexible material.

14. The welding device according to claim 13, characterized in that The blowing pipe includes at least two interconnected pipe segment structures, the pipe segment structure located at the head end is connected to the first connecting structure, and adjacent pipe segment structures can be bent relative to each other.

15. The welding device according to any one of claims 1 to 8, characterized in that The welding equipment also includes a nozzle guide structure, which has an air inlet and an air outlet; the air inlet of the nozzle guide structure is connected to the air outlet end of the blow pipe, and the width of the cross section of the nozzle guide structure increases or decreases from the air inlet to the air outlet.

16. The welding device according to claim 15, characterized in that When the air outlet of the nozzle structure is set as a round outlet, the diameter of the air outlet is greater than or equal to 3 mm and less than or equal to 10 mm; and / or, When the air outlet of the nozzle structure is set as a rectangular opening, the length of the cross section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, and the width of the cross section of the air outlet is greater than or equal to 2 mm and less than or equal to 5 mm; or, the length of the cross section of the air outlet is greater than or equal to 10 mm and less than or equal to 30 mm, and the width of the cross section of the air outlet is greater than or equal to 6 mm and less than or equal to 10 mm.

17. A blowing structure, applied to the welding equipment according to claim 1, characterized in that: The blowing structure comprises: A gas supply pipeline, the gas supply pipeline is used to connect the gas supply equipment; At least one air blowing pipe, the air blowing pipe is connected to the air supply pipeline, and the air outlet end of the air blowing pipe is used to make the air flow flow to the welding point formed by the insulating film and the top cover of the bare battery cell; The first connecting structure is used to connect with the fusion welding assembly; the first connecting structure is provided with an air flow channel, and the air supply pipeline, the air flow channel and the air blowing pipe are connected in sequence.

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