Welding method and device for a sealing nail

Abstract

The present invention provides a welding method and device for a sealing nail. The welding method of the sealing nail includes: adjusting the battery liquid injection hole to the welding station; driving the sealing nail to be pre-installed at the battery liquid injection hole along the guiding channel; pressing the end face where the battery liquid injection hole is located; pressing the end face of the sealing nail along the limiting channel; performing pre-spot welding on the sealing nail and the liquid injection hole; and performing full welding on the sealing nail and the liquid injection hole. The welding method and device for the sealing nail provided by the present invention aim to solve the problems of low welding precision and low welding efficiency in the traditional technology when welding a battery and a sealing nail.

Description

Technical Field

[0001] The present invention belongs to the technical field of power batteries, and particularly relates to a welding method and device for a sealing nail. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a laser beam with a high energy density as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. In the 1970s, it was mainly used for welding thin-walled materials and low-speed welding. The welding process belongs to the heat conduction type, that is, the laser radiation heats the surface of the workpiece, and the surface heat diffuses to the inside through heat conduction. By controlling parameters such as the width, energy, peak power, and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool. Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts.

[0003] In response to the call for energy conservation and emission reduction, the new energy vehicle industry has developed rapidly, driving the development of the power batteries of new energy vehicles. As the core component of new energy vehicles, power batteries play a decisive role in the performance of the whole vehicle. There are many parts that need to be welded during the manufacturing of power batteries, including tab welding, soft connection welding, and sealing nail welding. As the last process of power battery welding, the welding of sealing nails is crucial. Once there are welding defects, the power battery will be scrapped.

[0004] In the welding process of the battery sealing nail in the prior art, there are defects such as inaccurate positions of the sealing nail and the welding position, which greatly reduce the position accuracy after the product is welded with the sealing nail, affect the weld effect after welding, and reduce the welding yield of the sealing nail. Summary of the Invention

[0005] The present invention provides a welding method and device for a sealing nail to solve the problems of low welding accuracy and welding efficiency between the battery and the sealing nail in the traditional technology.

[0006] To solve the above problems, the present invention provides a welding method for a sealing nail, including:

[0007] Adjust the battery liquid injection hole to the welding station;

[0008] Drive the sealing nail to be pre-installed at the battery liquid injection hole along the guiding channel;

[0009] Press the end face where the battery liquid injection hole is located;

[0010] Press the end face of the sealing nail along the limiting channel;

[0011] Perform pre-spot welding on the sealing nail and the liquid injection hole;

[0012] Perform full welding on the sealing nail and the liquid injection hole.

[0013] According to a welding method of a sealing nail provided by the present invention, driving the sealing nail to be pre-installed at the battery liquid injection hole along the guiding channel includes:

[0014] Releasing the sealing nail at the opening of the guiding channel, so that the sealing nail slides along the guiding channel and is pre-installed at the battery liquid injection hole; and / or,

[0015] Driving the sealing nail to move along the guiding channel, and releasing the sealing nail when the sealing nail contacts the battery liquid injection hole;

[0016] Wherein, the aperture of the guiding channel is gradually increased from the position close to the battery liquid injection hole to the position far from the battery liquid injection hole.

[0017] According to a welding method of a sealing nail provided by the present invention, pressing the end face where the battery liquid injection hole is located includes: driving a plurality of positioning bumps arranged at intervals on the first pressing component to press the end face where the battery liquid injection hole is located.

[0018] According to a welding method of a sealing nail provided by the present invention, pressing the end face of the sealing nail along the limiting channel includes:

[0019] A welding groove is formed on the first pressing component, and driving the second pressing component to approach the sealing nail along the limiting channel, so that the avoiding pressing piece of the second pressing component presses the end face of the sealing nail in the welding groove;

[0020] Wherein, an avoiding space is formed on the avoiding pressing piece for laser to perform pre-spot welding on the sealing nail and the liquid injection hole.

[0021] According to a welding method of a sealing nail provided by the present invention, before performing pre-spot welding on the sealing nail and the liquid injection hole, it further includes:

[0022] Determining the pre-spot welding area of the sealing nail;

[0023] Adjusting the position of the second pressing component, so that the avoiding space of the second pressing component corresponds to the pre-spot welding area.

[0024] The present invention further provides a welding device for a sealing nail, including:

[0025] A base, on which a welding station is formed;

[0026] An adjusting component, installed on the base, for fixing and adjusting the position of the battery;

[0027] A guiding component, arranged on the base, having a guiding channel on the guiding component, and the guiding component is used for driving the sealing nail to be pre-installed at the battery liquid injection hole along the guiding channel;

[0028] The first pressing component is slidably mounted on the base. A welding groove and a limiting channel corresponding to the welding groove are formed on the first pressing component. A plurality of spaced positioning protrusions are provided on one side of the welding groove close to the battery, and each of the positioning protrusions is used to abut against and press the end face where the battery liquid injection hole is located during the process of approaching the battery.

[0029] The second pressing component is movably arranged on the first pressing component and is used to approach the sealing nail along the limiting channel and press the sealing nail pre-installed at the liquid injection hole in the welding groove; and,

[0030] The welding mechanism is located at one end of the welding groove away from the battery to weld the sealing nail pre-installed in the welding groove to the liquid injection hole.

[0031] According to a welding device for a sealing nail provided by the present invention, the guiding component includes a guiding cylinder and a guiding driving member. A guiding channel is formed in the guiding cylinder, and the guiding driving member is used to drive the sealing nail to be pre-installed at the battery liquid injection hole along the guiding channel; wherein, the aperture of the guiding channel gradually increases from the side close to the liquid injection hole towards the side away from the liquid injection hole.

[0032] According to a welding device for a sealing nail provided by the present invention, the first pressing component includes a first driving member and a pressing plate. The first driving member is mounted on the base to drive the pressing plate to approach or move away from the end face of the battery;

[0033] The welding groove is formed on the pressing plate. A guiding notch is formed on one side of the welding groove close to the battery. One end of the guiding notch with a small opening area extends outwards towards its central axis with a pressing plate. A plurality of spaced positioning protrusions are annularly arranged on one side of the pressing plate close to the battery;

[0034] Wherein, when the first driving member drives the pressing plate to approach and press the battery, one end of the battery abuts against and is pressed by each of the positioning protrusions along the guiding notch.

[0035] According to a welding device for a sealing nail provided by the present invention, two oppositely arranged limiting rollers are fixedly provided on one side of the welding groove, and the limiting channel is formed between the two oppositely arranged limiting rollers.

[0036] According to a welding device for a sealing nail provided by the present invention, the second pressing component includes a second driving member and an avoidance pressing piece arranged on one side of the welding groove. The length of the avoidance pressing piece is adjustable, and an avoidance hole is provided on the avoidance pressing piece;

[0037] The second driving member can drive the avoidance pressing piece to move, so that the avoidance pressing piece presses the sealing nail pre-installed at the liquid injection hole along the limiting channel, or makes the avoidance pressing piece avoid.

[0038] The welding method of the sealing nail provided by the present invention limits the pre-installation of the sealing nail through the guiding channel, which can ensure the installation position of the sealing nail, so that the sealing nail can be more accurately placed at the preset installation position at the liquid injection hole, effectively solving the problem that the installation position of the sealing nail is inaccurate in the traditional technology and the position needs to be continuously adjusted when matching with the battery. In addition, the present invention performs multiple positioning on the battery and the sealing nail, which can improve the positioning accuracy of the battery and the sealing nail, and adopts the sequential welding order of pre-spot welding and full welding, which can further improve the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0040] Figure 1 is a schematic flow chart of the welding method of the sealing nail provided by the present invention;

[0041] Figure 2 is a first three-dimensional structural diagram of the welding device of the sealing nail provided by the present invention;

[0042] Figure 3 is Figure 2 an enlarged structural diagram of part A in

[0043] Figure 4 is a second three-dimensional structural diagram of the welding device of the sealing nail provided by the present invention;

[0044] Reference numerals: 1: welding device of the sealing nail; 2: base; 3: first pressing assembly; 4: second pressing assembly; 5: positioning convex block; 6: first driving member; 7: pressing plate; 8: second driving member; 10: avoiding pressing piece; 11: avoiding hole; 12: limiting roller; 13: guiding notch; 14: pressing plate; 15: welding groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0046] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0048] In the embodiments of the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0049] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0050] The following will be combined with Figures 1-4 Describe the welding method and device of the sealing nail of the present invention.

[0051] The present invention provides a welding method for a sealing nail, comprising:

[0052] S100. Adjust the battery liquid injection hole to the welding station;

[0053] S200. Drive the sealing nail to be pre-installed at the battery liquid injection hole along the guiding channel;

[0054] S300. Press the end face where the battery liquid injection hole is located;

[0055] S400. Press the end face of the sealing nail along the limiting channel;

[0056] S500. Perform pre-spot welding on the sealing nail and the liquid injection hole;

[0057] S600. Perform full welding on the sealing nail and the liquid injection hole.

[0058] When welding the battery and the sealing nail, it is necessary to accurately fix the positions of both the battery and the sealing nail to ensure a good and precise welding effect. In the technical solution provided by the present invention, first, the position of the battery needs to be adjusted to expose the battery liquid injection hole under the welding station. Specifically, a clamping member can be used to clamp one end of the battery (generally the end away from the liquid injection hole). After one end of the battery is fixed, the position information of the battery liquid injection hole is obtained, and then the position of the liquid injection hole is adjusted to expose the liquid injection hole under the welding station for convenient welding with the sealing nail. It should be noted that the clamping member can be a robotic arm that has both a clamping function and a moving function, or an ordinary clamping jaw. By setting an adjustment member such as a rotating shaft to cooperate with adjusting the position of the battery, the battery can be first fixed on the rotating shaft by the clamping jaw, and then the rotating shaft is driven to move to adjust the orientation of the liquid injection hole to match the welding station. In addition, for obtaining the position information of the liquid injection hole, a vision camera can be used. By taking multiple photos to determine the actual position of the liquid injection hole, and then obtaining the moving path of the liquid injection hole through logical calculation, and moving the battery through the above-mentioned clamping member to move the liquid injection hole to the predetermined position.

[0059] After the position of the liquid injection hole is adjusted, the sealing nail needs to be pre-installed at the liquid injection hole. In the traditional technology, the sealing nail is generally directly picked up and placed in the corresponding position of the battery. However, in the actual operation process, it is difficult to ensure the position where the sealing nail is placed, and there may be deviations during the placement process. Therefore, after the sealing nail is placed on the battery, the positions of the battery and the sealing nail need to be adjusted again, which will cause problems such as low welding accuracy and low welding efficiency. By setting the guiding channel in the present invention, the guiding channel corresponds to the liquid injection hole, so that the sealing nail can be pre-installed at the liquid injection hole along the guiding channel, which can solve the problem that the installation position of the sealing nail in the traditional technology is inaccurate and needs to be continuously adjusted during the matching process with the battery.

[0060] After the sealing nail is pre-installed in the liquid injection hole, it is necessary to fix the battery and the sealing nail. First, it is necessary to press the end face where the battery liquid injection hole is located, that is, press the battery, and then press the sealing nail. It should be noted that since the cross-sectional area of the sealing nail is smaller than that of the battery, it is not easy to press and position. In the technical solution provided by the present invention, it is necessary to press the sealing nail along the limiting channel, which can ensure that the pressing position of the sealing nail is determined each time, eliminating the trouble of adjusting the position of the sealing nail subsequently, and also ensuring the welding accuracy between the sealing nail and the battery.

[0061] The welding method of the sealing nail provided by the present invention limits the pre-installation of the sealing nail through the guiding channel, which can ensure the installation position of the sealing nail, so as to accurately place the sealing nail at the preset installation position at the liquid injection hole of the battery, and can effectively solve the problem that the installation position of the sealing nail in the traditional technology is inaccurate and the position needs to be continuously adjusted when matching with the battery; in addition, the present invention performs multiple positioning on the battery and the sealing nail, which can improve the positioning accuracy of the battery and the sealing nail, and adopts the sequential welding sequence of pre-spot welding and full welding, which can further improve the welding quality.

[0062] Specifically, S200, driving the sealing nail to be pre-installed at the battery liquid injection hole along the guiding channel includes:

[0063] S210, releasing the sealing nail at the opening of the guiding channel, so that the sealing nail slides along the guiding channel and is pre-installed at the battery liquid injection hole; and / or,

[0064] S220, driving the sealing nail to move along the guiding channel, and releasing the sealing nail when the sealing nail contacts the battery liquid injection hole;

[0065] Wherein, the aperture of the guiding channel is gradually increased from the position close to the battery liquid injection hole to the position far from the battery liquid injection hole.

[0066] In the technical solution provided by the present invention, there are various ways for the sealing nail to move along the guiding channel. In the first embodiment, the sealing nail is released at the opening of the guiding channel, and the sealing nail is pre-installed along the guiding channel to the liquid injection hole under the influence of gravity; in the second embodiment, a picking member is used to drive the sealing nail to move along the guiding channel, and the sealing nail is released when it is pre-installed to the liquid injection hole. The picking member can be set as a suction cup or a micro gripper, etc., and the present invention does not limit this. It should be noted that in order to facilitate the movement of the sealing nail along the guiding channel, in the technical solution provided by the present invention, the aperture of the guiding channel is gradually increased from the position close to the battery liquid injection hole to the position far from the battery liquid injection hole, so that the sealing nail is more likely to enter from the entrance of the guiding channel and gradually adjust its position during the movement along the guiding channel. It should be noted that in the embodiment where the sealing nail falls by its own gravity, the maximum aperture of the guiding channel should not exceed 10% of the actual diameter of the sealing nail, so as to prevent the sealing nail from turning over during the falling process; for both embodiments, the minimum aperture of the guiding channel should not exceed 1% of the actual diameter of the sealing nail, so as to ensure the pre-installation accuracy of the sealing nail to the greatest extent.

[0067] Further, S300, pressing the end face where the battery liquid injection hole is located includes: driving a plurality of spaced positioning protrusions on the first pressing assembly to press the end face where the battery liquid injection hole is located.

[0068] The first pressing assembly presses and fixes the battery. The first pressing assembly can be set in various forms, such as a pressing plate, a pressing block, etc. The first pressing assembly can also approach and press the battery in various motion forms, such as approaching and pressing the battery in the up-down direction, or approaching and pressing the battery in the left-right direction. The present invention does not limit this. It should be noted that there are a plurality of spaced positioning protrusions on the first pressing assembly, and the positioning protrusions match the end face where the battery liquid injection hole is located, which can play a role in evenly pressing the battery. In the technical solution provided by the present invention, a welding groove is formed on the first pressing assembly, so the positioning protrusions can be arranged on the circumference of the welding groove to ensure stable contact between the first pressing assembly and the battery.

[0069] Furthermore, S400, pressing the end face of the sealing nail along the limiting channel includes:

[0070] S410, a welding groove is formed on the first pressing assembly, driving the second pressing assembly to approach the sealing nail along the limiting channel, so that the avoiding pressing piece of the second pressing assembly presses the end face of the sealing nail in the welding groove;

[0071] Wherein, an avoiding space is formed on the avoiding pressing piece for the laser to perform pre-spot welding on the sealing nail and the liquid injection hole.

[0072] In an embodiment provided by the present invention, the second pressing component is set as an avoidance pressing piece, which can be arranged on the first pressing component or at other positions, and the present invention does not limit this. The second pressing component is close to the end face of the sealing nail along the limiting channel, and the limiting channel can ensure that the pressing position of the avoidance pressing piece on the sealing nail is determined each time, eliminating the trouble of adjusting the position of the sealing nail subsequently and ensuring the welding accuracy between the sealing nail and the battery. It should also be noted that an avoidance space is formed on the avoidance pressing piece, which can be an avoidance groove or an avoidance hole arranged on the avoidance pressing piece, etc., and the laser head can weld the sealing nail and the battery at the avoidance space.

[0073] In addition, before pre-spot welding the sealing nail and the liquid injection hole in S500, it further includes:

[0074] S10. Determine the pre-spot welding area of the sealing nail;

[0075] S20. Adjust the position of the second pressing component so that the avoidance space of the second pressing component corresponds to the pre-spot welding area.

[0076] It should be noted that an avoidance space is formed on the avoidance pressing piece, and the welding equipment performs pre-spot welding on the sealing nail at the avoidance space. For sealing nails of different specifications or batteries of different specifications, the requirements for the pre-spot welding area of the sealing nail may be different. Therefore, in the technical solution provided by the present invention, the position of the second pressing component is adjustable, specifically, it can be in ways such as sliding or rotating, and the present invention does not limit this. By adjusting the position of the second pressing component, pre-spot welding can be performed on different areas of the sealing nail, or by adjusting the position of the second pressing component, the avoidance space can be made to correspond to different areas of the same sealing nail, so as to perform multiple pre-spot weldings on the same sealing nail and improve the strength of the pre-spot welding.

[0077] Please refer to Figures 2-4 , on the basis of the above sealing nail welding method, the present invention further provides a sealing nail welding device 1, including: a base 2, an adjustment component, a guiding component, a first pressing component 3, a second pressing component 4, and a welding mechanism. Among them, the fixing component is arranged on the base 2, mainly used for fixing and adjusting the position of the battery to adjust the position of the liquid injection hole below the welding mechanism. The fixing component can be a robotic arm or a matching form of an ordinary jaw and a rotating shaft. The position of the battery can be adjusted by moving and rotating the robotic arm, or the battery can be clamped by the jaw onto the rotating shaft, and then the position of the battery can be adjusted by the rotating shaft. It should be noted that if you want to accurately adjust the position of the liquid injection hole, it is necessary to use a vision camera to obtain the position information of the liquid injection hole, obtain the moving path of the battery through logical calculation, and then use the fixing component to move the battery along the moving path, so that the position of the liquid injection hole can be adjusted below the welding mechanism;

[0078] The guide assembly is used to drive the sealing pin to be pre-installed along the guide channel to the battery injection hole. The guide assembly can have a variety of settings, such as forming a guide channel inside the guide cylinder, or defining a guide channel between two guide blocks, etc., and the present invention does not limit this. After the battery is adjusted, the sealing pin needs to be pre-installed at the injection hole. In the technical solution provided by the present invention, through the setting of the guide assembly, the guide channel corresponds to the injection hole, so that the sealing pin can be pre-installed at the injection hole along the guide channel, which can solve the problem of inaccurate installation position of the sealing pin in traditional technology and the need to constantly adjust the position during the installation and matching with the injection hole;

[0079] After the sealing nail is pre-installed to the battery injection hole, the first clamping assembly 3 needs to clamp the end of the battery. Specifically, the first clamping assembly 3 is slidably installed on the base 2, and a welding groove 15 and a limiting channel corresponding to the welding groove 15 are formed on the first clamping assembly 3. The side of the welding groove 15 close to the battery is provided with a plurality of spaced positioning protrusions 5. The positioning protrusions 5 can abut against and clamp the end face of the battery injection hole during the active stroke close to the battery, and clamp and fix the battery to ensure the stability of the battery;

[0080] After the first clamping assembly 3 has clamped the battery, the second clamping assembly 4 needs to clamp the sealing pin. The second clamping assembly 4 is movably arranged on the first clamping assembly 3 to approach the sealing pin along the limiting channel and to clamp the sealing pin pre-installed at the injection hole in the welding groove 15. It should be noted that the limiting channel limits the movement of the second clamping assembly 4, which can ensure that the second clamping assembly 4 always determines the clamping position of the sealing pin each time under the limiting action of the limiting channel, thereby avoiding the trouble of adjusting the sealing pin position later. In addition, the second clamping assembly 4 is arranged on the first clamping assembly 3, which can prevent the movement of the two clamping assemblies from interfering with each other;

[0081] After the first pressing assembly 3 and the second pressing assembly 4 respectively press and fix the battery and the sealing pin, the welding mechanism arranged on the side of the welding groove 15 away from the battery performs pre-spot welding and full welding on the sealing pin respectively.

[0082] The welding device 1 of the sealing nail provided by the present invention has a guiding channel corresponding to the liquid injection hole, so that the sealing nail can be pre-installed at the liquid injection hole along the guiding channel, which can solve the problem that the installation position of the sealing nail in the traditional technology is inaccurate and the position needs to be continuously adjusted when matching with the battery; the plurality of positioning bumps 5 provided on the first pressing assembly 3 can tightly fit and fix the end of the battery, and the second pressing assembly 4 is arranged on the first pressing assembly 3. When the first pressing assembly 3 presses the battery, then move the second pressing assembly 4, which reduces the moving stroke of the second pressing assembly 4; the second pressing assembly 4 can press the sealing nail and will not affect the position of the sealing nail during the process of pressing or moving away from the sealing nail; the fixing assembly can ensure the position of the battery and ensure the welding accuracy. The welding device 1 of the sealing nail provided by the present invention has a simple structure and is easy to operate, and can significantly improve the welding accuracy and quality of the sealing nail and the battery.

[0083] In an optional embodiment, the guiding assembly includes a guiding cylinder and a guiding driving member. A guiding channel extending along the axial direction of the guiding cylinder is formed in the guiding cylinder, and the wire driving member is used to drive the sealing nail to be pre-installed at the liquid injection hole of the battery along the guiding channel; wherein, the aperture of the guiding channel is gradually increased from the position close to the liquid injection hole to the position far from the liquid injection hole.

[0084] It should be noted that the guiding driving member mainly plays a role in clamping and fixing the sealing nail. The guiding driving member can be a suction cup or a suction needle, or a micro gripper, and the present invention does not limit this. The guiding driving member first sucks or clamps the sealing nail, moves the sealing nail to the opening of the guiding channel. At this time, the guiding driving member can release the sealing nail, so that the sealing nail falls along the guiding channel to the liquid injection hole by its own gravity, or the guiding driving member drives the sealing nail to move along the guiding channel, and then releases the sealing nail when the sealing nail contacts the liquid injection hole. It should be noted that the guiding assembly is movably arranged on the base 2, so that it can be moved and avoided in time after the sealing nail is pre-installed, so as to avoid interfering with the subsequent pressing process. Of course, the movably arranged guiding assembly can also be adapted to the welding of different types of battery sealing nails, because in the actual use process, the guiding assembly can be adjusted according to the position of the liquid injection hole so that the guiding channel matches different liquid injection holes. The moving driving member of the guiding assembly can be a combined cylinder or a robotic arm, and the present invention does not limit this. Each time the guiding assembly is driven to move above the liquid injection hole, it is necessary to confirm the relative position of the wire channel and the liquid injection hole. It can be judged by the way of projection. If the projection surfaces of the two coincide, it means that their positions correspond; the coordinate point judgment method can also be used. By obtaining the coordinates of the center position of the liquid injection hole and the center position of the guiding channel, and then calculating the moving path of the guiding assembly through a program, the guiding assembly can be moved to correspond to the liquid injection hole according to the preset path;

[0085] It should also be noted that the aperture of the guide channel is gradually increased from the position close to the injection hole to the position far away from the injection hole, so that the sealing nail can more easily enter from the entrance of the wire channel and gradually adjust its position during the movement along the guide channel.

[0086] Specifically, the first clamping assembly 3 includes a first driving member 6 and a pressing plate 7. The first driving member 6 is installed on the base 2 to drive the pressing plate 7 to approach or move away from the end face of the battery. In this embodiment, the pressing plate 7 extends horizontally, and a slide groove is provided on the base 2. The pressing plate 7 is slidably connected to the base 2 through a slider matching the slide groove. In an optional embodiment, a vertically extending pressing plate 7 or an obliquely extending pressing plate 7 can also be provided according to the production line structure, and the present invention does not limit this. For details, please refer to Figure 3 A welding groove 15 is formed on the pressing plate 7, and a guide notch 13 is formed on the side of the welding groove 15 close to the battery. The guide notch 13 guides the end of the battery, making it convenient for the battery to be inserted and corresponding to the welding groove 15. In addition, a clamping plate 14 is extended outward from the central axis of the end of the guide notch 13 with a small opening area, and a plurality of positioning protrusions 5 are arranged at intervals on the side of the clamping plate 14 close to the battery. The clamping plate 14 limits the end of the battery and the positioning protrusion 5 presses and fixes the end surface of the battery, thereby playing a stable fixing role on the battery and ensuring the welding accuracy.

[0087] It should also be noted that, since a lot of smoke and dust will be generated during the welding process of the sealing nail, a dust collection component is also provided in the sealing nail welding device 1 provided by the present invention. Figure 2 The dust collection component is arranged on the side of the pressing plate 7 away from the first driving member 6. The dust collection component includes a dust collection part and a connecting part which are connected to each other. An annular dust collection groove is formed on the dust collection part. The notch of the dust collection groove is arranged toward the welding groove and connected to the welding groove, and is used to fully absorb the smoke generated during the welding process of the sealing nail; one end of the connecting part is connected to the dust collection groove, and the other end is connected to the negative pressure fan. By setting the dust collection component, the cleanliness of the device can be maintained.

[0088] As mentioned above, the avoidance pressing sheet 10 moves in the limiting channel to press the sealing nail. In the technical solution provided by the present invention, two relatively set limiting rollers 12 are fixedly provided on one side of the welding groove 15, and a limited channel is formed between the two relatively set limiting rollers 12. When the avoidance pressing sheet 10 presses the sealing nail, the avoidance pressing sheet 10 is located in the limiting channel, and the two sides of the avoidance pressing sheet 10 are respectively in rolling contact with the two limiting rollers 12, so that the avoidance pressing sheet 10 can always be within the limit of the two limiting rollers 12 while moving, ensuring the correspondence between the avoidance pressing sheet 10 and the sealing nail position.

[0089] For further information, see Figure 2, the second pressing assembly 4 includes a second driving member 8 disposed on one side of the installation groove and an avoidance pressing piece 10. It should be noted that in the technical solution provided by the present invention, the welding groove 15 includes two regions, one region for welding and one region for installing the limit roller 12 and the second pressing assembly 4. Specifically, the extension length of the avoidance pressing piece 10 is adjustable, and an avoidance hole 11 is provided on the avoidance pressing piece 10. An avoidance space is formed at the avoidance hole 11. When the avoidance pressing piece 10 presses the sealing nail, the laser head can weld the sealing nail and the battery at the avoidance space; the length of the avoidance pressing piece 10 is adjustable, so that the avoidance pressing piece 10 can press different regions of the sealing nail, so that the avoidance hole 11 corresponds to different regions of the sealing nail, so as to perform pre-spot welding on different regions of the sealing nail, or perform pre-spot welding on different regions of the sealing nail. Correspondingly, in this embodiment, the avoidance pressing piece 10 is disposed on the installation block. An installation hole is provided on the avoidance pressing piece 10, and positioning holes and positioning pins are provided on the installation block. The avoidance pressing piece 10 can be moved to correspond to different positioning holes on the installation block, and then fixed with the positioning pins, so that the extension length of the avoidance pressing piece 10 is adjustable. Further, the movement mode of the avoidance pressing piece 10 has various types. It can be lifted to press the sealing nail, or it can be rotated to press the sealing nail. The present invention does not limit this. In this embodiment, the second driving member 8 is set as a lifting cylinder, and the avoidance pressing piece 10 is driven by the lifting cylinder to clamp the sealing nail. In addition, in order to prevent the avoidance pressing piece 10 and the installation block from interfering with the pre-installation of the sealing nail, the installation block is rotatably disposed at the end of the second driving member 8. When the sealing nail is not pressed, the installation block can be lifted and rotated so that the installation block and the avoidance pressing piece 10 avoid the welding groove 15; when pressing is required, the installation block can be lowered and rotated so that the avoidance pressing piece 10 is located in the limit channel and is pressed under the limiting action of the limit channel.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding device for a sealing nail, characterized in that, Comprising: A base on which a welding station is formed; An adjustment assembly mounted on the base for fixing and adjusting the position of the battery; A guiding assembly disposed on the base, the guiding assembly having a guiding channel, and the guiding assembly is used for driving a sealing nail to be pre-installed at the liquid injection hole of the battery along the guiding channel; A first pressing assembly slidably mounted on the base, a welding groove and a limiting channel corresponding to the welding groove are formed on the first pressing assembly, and a plurality of spaced positioning protrusions are provided on the side of the welding groove close to the battery, and each of the positioning protrusions is used for abutting and pressing the end face where the liquid injection hole of the battery is located during the process of approaching the battery; A second pressing assembly movably disposed on the first pressing assembly for approaching the sealing nail along the limiting channel and pressing the sealing nail pre-installed at the liquid injection hole in the welding groove; and, A welding mechanism located at the end of the welding groove away from the battery to weld the sealing nail pre-installed in the welding groove to the liquid injection hole; The guiding assembly includes a guiding cylinder and a guiding driving member, the guiding channel is formed in the guiding cylinder, and the guiding driving member is used for driving the sealing nail to be pre-installed at the liquid injection hole of the battery along the guiding channel; wherein, the aperture of the guiding channel is gradually increased from the side close to the liquid injection hole towards the side away from the liquid injection hole; The first pressing assembly includes a first driving member and a pressing plate, and the first driving member is mounted on the base to drive the pressing plate to approach or move away from the end face of the battery; The welding groove is formed on the pressing plate, a guiding notch is formed on the side of the welding groove close to the battery, a pressing plate extends outwards from the end with a small opening area of the guiding notch towards its central axis, and a plurality of spaced positioning protrusions are annularly arranged on the side of the pressing plate close to the battery; Wherein, when the first driving member drives the pressing plate to approach and press the battery, one end of the battery abuts and presses against each of the positioning protrusions along the guiding notch; The second pressing assembly includes a second driving member and an avoidance pressing piece arranged on one side of the welding groove, the length of the avoidance pressing piece is adjustable, and an avoidance hole is provided on the avoidance pressing piece; The second driving member can drive the avoidance pressing piece to move, so that the avoidance pressing piece presses the sealing nail pre-installed at the liquid injection hole along the limiting channel, or the avoidance pressing piece is avoided; 2. The welding device for the sealing nail according to claim 1, characterized in that, Two oppositely arranged limiting rollers are fixedly provided on one side of the welding groove, and the limiting channel is formed between the two oppositely arranged limiting rollers; 3. A welding method for a sealing nail, based on the welding device for a sealing nail as described in any one of claims 1 or 2, characterized in that, Comprising: Adjust the liquid injection hole of the battery to the welding station; Drive the sealing nail to be pre-installed at the liquid injection hole of the battery along the guiding channel; Press the end face where the liquid injection hole of the battery is located; Press the end face of the sealing nail along the limiting channel; Perform pre-spot welding on the sealing nail and the liquid injection hole; Perform full welding on the sealing nail and the liquid injection hole; Driving the sealing nail to be pre-installed at the liquid injection hole of the battery along the guiding channel includes: Releasing the sealing nail at the opening of the guiding channel so that the sealing nail slides along the guiding channel and is pre-installed at the liquid injection hole of the battery; and / or, Driving the sealing nail to move along the guiding channel and releasing the sealing nail when the sealing nail contacts the liquid injection hole of the battery; Wherein, the aperture of the guiding channel is gradually increased from the position close to the battery liquid injection hole towards the position away from the battery liquid injection hole.

4. The welding method of the sealing nail according to claim 3, characterized in that, Pressing the end face where the battery liquid injection hole is located includes: driving a plurality of positioning bumps arranged at intervals on the first pressing assembly to press the end face where the battery liquid injection hole is located.

5. The welding method of the sealing nail according to claim 4, characterized in that, Pressing the end face of the sealing nail along the limiting channel includes: A welding groove is formed on the first pressing assembly, and the second pressing assembly is driven to approach the sealing nail along the limiting channel, so that the avoidance pressing piece of the second pressing assembly presses the end face of the sealing nail in the welding groove; Wherein, an avoidance space is formed on the avoidance pressing piece for laser to perform pre-spot welding on the sealing nail and the liquid injection hole.

6. The welding method of the sealing nail according to claim 5, characterized in that Before performing pre-spot welding on the sealing nail and the liquid injection hole, it further includes: Determining the pre-spot welding area of the sealing nail; Adjusting the position of the second pressing assembly so that the avoidance space of the second pressing assembly corresponds to the pre-spot welding area.

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