Welding dust removal device and battery production system

Abstract

The embodiment of the application provides a welding dust removal device and a battery production system, the welding dust removal device comprises a device main body and a welding dust removal cover, the device main body comprises a through hole and a notch in communication with the through hole, the notch and the through hole both penetrate two surfaces of the device main body in a first direction, the notch penetrates one surface of the device main body in a second direction perpendicular to the first direction and extends along the second direction; the welding dust removal cover comprises a laser channel and a dust removal channel in communication with the laser channel, the laser channel extends along the first direction, and the dust removal channel is arranged at an angle with the extension direction of the laser channel; the device main body is arranged on a structure with a sealing nail, the through hole is arranged opposite to the sealing nail along the first direction, and the projection of the sealing nail and the projection of the welding seam area of the sealing nail are both completely located in the projection of the through hole; the welding dust removal cover is arranged on the side of the device main body away from the sealing nail, the laser channel is coaxially arranged with the through hole and is in communication with the through hole, along the second direction, the dust removal channel and the notch are located on opposite sides of the dust removal channel respectively.

Description

Technical Field

[0001] This application relates to the field of welding technology, and in particular to a welding dust removal device and a battery production system. Background Technology

[0002] Currently, laser welding boasts high energy density and efficiency, and is widely used in various fields such as batteries and automobiles. For example, the sealing pins of a battery need to be installed into the injection hole of the end cap, and laser welding is required to connect the sealing pins and the end cap. However, before laser welding the sealing pins and end cap using welding equipment, the sealing pins need to be pressed into the injection hole using a pressing device. After the pressing device withdraws, a pressing groove notch is formed on the welding equipment. Due to the negative pressure effect of the dust removal port of the welding equipment, a large amount of air is drawn in from the pressing groove notch. The protective gas inside the welding equipment collides with the drawn-in air in and around the weld area of ​​the sealing pin, causing turbulence in the protective gas flow field in the weld area, which in turn affects the welding quality of the sealing pin. Utility Model Content

[0003] This application provides a welding dust removal device and a battery production system, which can prevent air from interfering with the weld area of ​​the sealing nail and the flow field of the protective gas nearby, thereby ensuring the welding quality of the sealing nail.

[0004] In a first aspect, embodiments of this application provide a welding dust removal device. The welding dust removal device is used for welding dust removal in the weld area of ​​a sealing nail, and the welding dust removal device includes: The device body includes a through hole and a notch, both of which penetrate two surfaces of the device body in a first direction. The notch penetrates one surface of the device body in a second direction and extends along the second direction, communicating with the through hole; wherein the first direction and the second direction are perpendicular. A welding dust removal hood includes a laser channel and a dust removal channel. The laser channel extends along a first direction, and the extension direction of the dust removal channel is set at an angle to the extension direction of the laser channel, and the dust removal channel and the laser channel are connected. The main body of the device is mounted on a structure with the sealing nail. Along the first direction, the through hole is opposite to the sealing nail, and the projections of the sealing nail and the weld area of ​​the sealing nail are completely located within the projection of the through hole. The welding dust removal hood is mounted on the side of the main body of the device facing away from the sealing nail. The laser channel is coaxially arranged and connected with the through hole. In the second direction, the dust removal channel and the notch are located on opposite sides of the laser channel.

[0005] In one embodiment, the main body of the device further includes a plurality of inflation channels, each of which is connected to the through hole. The plurality of inflation channels are arranged around the periphery of the through hole and are spaced apart from each other. The plurality of inflation channels extend away from the central axis of the through hole. The welding dust removal equipment also includes multiple air-filling pipes, each of which is connected to an air-filling channel and fills the air-filling channel with protective gas so that the protective gas covers the weld area of ​​the sealing nail.

[0006] In one embodiment, the plurality of inflation tubes are all the same size and are all connected to the same interface.

[0007] In one embodiment, the extension directions of two adjacent inflation channels are perpendicular.

[0008] In one embodiment, the device body includes a first plate and a second plate, the first plate and the second plate are stacked and connected along the first direction, and at least a portion of the second plate is embedded in the first plate and surrounded by the first plate; The first plate includes a plurality of ventilation slots and a receiving slot. The plurality of ventilation slots and the receiving slots are all recessed on the same surface of the first plate in the first direction. The plurality of ventilation slots are arranged around the periphery of the receiving slot and spaced apart from each other. The plurality of ventilation slots penetrate the side wall of the receiving slot and communicate with the receiving slot. The second plate includes a plurality of air holes, each of which penetrates both surfaces of the second plate in the first direction. Each air hole is connected to a ventilation groove and an inflation pipe, and the interval between each air hole and the second plate and the ventilation groove forms the inflation channel, which is connected to the receiving groove.

[0009] In one embodiment, the venting groove has a bottom wall surface and a side wall surface, the side wall surface is connected to the side wall of the receiving groove, the bottom wall surface is connected to the side wall surface and the bottom wall of the receiving groove, and a portion of the bottom wall surface away from the bottom wall is an arc-shaped surface.

[0010] In one embodiment, the first plate further includes a first through hole and a first notch, both of which penetrate the two surfaces of the first plate in the first direction. The first through hole is disposed on the bottom wall of the receiving groove and communicates with the receiving groove. The first notch penetrates the side wall of the receiving groove and the hole wall of the first through hole, and the first notch communicates with the first through hole. The second plate further includes a second through hole and a second notch, both of which penetrate the two surfaces of the second plate in the first direction. The second notch penetrates the hole wall of the second through hole, and the second notch and the second through hole are connected. The first through hole and the second through hole are coaxially arranged and connected to form the through hole. The first notch and the second notch extend in the same direction. The first notch and the second notch are arranged opposite to each other in the first direction and connected to form the notch.

[0011] In one embodiment, a guide surface is formed between the hole wall of the first through hole and the bottom wall of the receiving groove, and the guide surface is set at an angle to the hole wall of the first through hole and the bottom wall of the receiving groove, respectively.

[0012] In one embodiment, the first plate further includes a plurality of support protrusions, and a support protrusion is provided on the sidewall of the receiving groove between each pair of adjacent ventilation grooves. Each support protrusion includes a support ramp and a support side, the support side being connected to the bottom wall of the receiving groove and facing the central axis of the receiving groove, and the support ramp being connected to the support side and the sidewall. The first notch penetrates the support slope and the support side of the support protrusion, and two blocks are respectively protruding on the support side of the support protrusion near the first notch, and both blocks extend to the edge of the first through hole.

[0013] In one embodiment, two baffles are respectively provided on the sidewalls of the receiving groove near the first notch, and both baffles are connected to the supporting inclined surface of the supporting protrusion.

[0014] In one embodiment, the welding dust removal equipment further includes an auxiliary spraying device, which is disposed within the notch of the equipment body and fixedly connected to the equipment body. The auxiliary spraying device is capable of ejecting protective gas along the central axis direction opposite to the through hole, and the spraying direction of the protective gas is set at an angle to the central axis direction of the through hole.

[0015] Secondly, embodiments of this application provide a battery production system. The battery production system includes a battery cell and the welding dust removal equipment. The battery cell includes an end cap and a sealing pin. The end cap has a liquid injection hole. The sealing pin is inserted into the liquid injection hole and welded to the end cap surrounding the liquid injection hole. The welding dust removal equipment is mounted on the battery cell. In a first direction, the through hole of the welding dust removal equipment is directly opposite the sealing pin, and the projections of the sealing pin and its weld area are completely within the projection of the through hole of the welding dust removal equipment. The gas filling pipe fills the weld area with protective gas through the gas filling channel. The dust removal channel is under negative pressure at one end opposite to the laser channel to remove dust from the weld area and suck away part of the protective gas and the air sucked in through the laser channel and the notch.

[0016] In one embodiment, the concentration of the protective gas in the weld region is greater than or equal to 0.9.

[0017] In related technologies, the battery's sealing pin is inserted into the liquid injection hole of the end cap, and laser welding is required to connect the sealing pin and the end cap. However, before laser welding the sealing pin and end cap using welding equipment, the sealing pin needs to be pressed into the liquid injection hole using a pressing device. After the pressing device is withdrawn, a pressing groove notch is formed on the welding equipment. Existing dust removal ports are located on the same side as the pressing groove notch, or on both sides of the width of the pressing groove notch. Because the dust removal port of the welding equipment has a negative pressure effect, a large amount of air is drawn in from the pressing groove notch, and the shielding gas in the weld area flows towards the dust removal port side, resulting in extremely low shielding gas concentration in and around the weld area. Moreover, the collision between the drawn-in air and the shielding gas in the weld area within the welding equipment creates eddies, causing turbulence in the shielding gas flow field in and around the weld area; thus affecting the welding quality of the sealing pin and end cap.

[0018] In this embodiment, the position of the dust removal port in the welding dust removal equipment has been optimized. The dust removal port of the welding dust removal hood is located directly opposite the notch in the main body of the equipment in the second direction. When negative pressure dust removal is applied to one side of the dust removal port, a portion of the protective gas in the weld area and the welding fumes are sucked away, while air is also drawn in from the notch and the weld opening of the welding pipe. Utilizing the symmetrical characteristics of the airflow, the sucked-in air can be directly drawn away through the dust removal channel and the dust removal port, effectively balancing the air pressure in the weld area, reducing the interference of the negative pressure of dust removal on the protective gas layer, preventing the protective gas from being excessively sucked in by the negative pressure before passing through the weld area, increasing the concentration of the protective gas in and around the weld area, ensuring the coverage effect of the protective gas on the weld area, and thus improving the welding quality of the sealing nail and end cap. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments or background art of this application, the accompanying drawings used in the embodiments or background art of this application will be described below.

[0020] Figure 1 This application provides a schematic diagram of the structure of a welding dust removal device and a battery cell in a battery production system. Figure 2 for Figure 1 The diagram shows the exploded structure of the welding dust removal equipment and the battery cell. Figure 3 for Figure 2 The diagram shows the structure of the welding dust removal equipment. Figure 4 for Figure 3 The diagram shows the exploded structure of the welding dust removal equipment. Figure 5 for Figure 4 A schematic diagram of the structure of the first plate of the welding dust removal equipment shown; Figure 6 for Figure 5 The diagram shows the structure of the first plate from another angle; Figure 7 for Figure 5 The diagram shows a cross-sectional view of the first plate along AA. Figure 8 for Figure 4 A schematic diagram of the structure of the second plate of the welding dust removal equipment shown; Figure 9 for Figure 8 The diagram shows the structure of the second plate from another angle; Figure 10 for Figure 4 The diagram shows the structural schematic of the welding dust removal hood of the welding dust removal equipment from another angle. Figure 11 for Figure 3 The diagram shows a cross-sectional view of the welding dust removal equipment along BB. Figure 12 for Figure 3 The diagram shows a cross-sectional view of the welding dust removal equipment along the CC direction. Figure 13 for Figure 1 The diagram shows the cross-sectional structure of the welding dust removal equipment and the battery cell along DD; Figure 14 for Figure 4 The top view of the first plate shown; Figure 15 for Figure 1 The diagram shows a partial cross-sectional structure of the welding dust removal equipment and the battery cell along EE.

[0021] The terms corresponding to the reference numerals in the figures are as follows: Battery production system 1000, Welding dust removal equipment 100, Equipment body 10, Through hole 101, Notch 102, Air filling channel 103, Outer plate 1, First surface 11, Second surface 12, First side surface 13, Second side surface 14, Mounting groove 15, Perforation 16, First plate 2, First body 21, First surface 211, Second surface 212, First side surface 213, Second side surface 214, Assembly groove 22, Groove bottom surface 221, Groove side surface 222, Mounting boss 23, Boss surface 231, Boss side surface 232, Receiving groove 24, Bottom wall 241, Side wall 242, Support protrusion 25, Support inclined surface 251, Support side surface 252, Vent groove 26, Bottom wall surface 261, Side wall surface 262, First through hole 27, Guide surface m, First notch 28, First segment 281, First... Section 282, Block a, Baffle b, Second plate 3, Second body 31, Third surface 311, Fourth surface 312, Third side surface 313, Fourth side surface 314, Limiting protrusion 32, Limiting surface 321, Limiting peripheral surface 322, Extending protrusion 33, Extending surface 331, Air hole 34, Second through hole 35, First opening 351, Second opening 352, Second notch 36, Third section 361, Fourth section 362, Welding dust hood 40, Connecting plate 41, First connecting surface 411, Second connecting surface 412, Connecting hole 413, Pipe body 42, Welding pipe 43, Laser channel 431, Welding port 432, Dust removal pipe 44, Dust removal channel 441, Dust removal port 442, Through port 443, Battery cell 200, Sealing nail 201, Weld area 202, First direction Z, Second direction X, Third direction Y, Shielding gas M, Air N. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly specified. Furthermore, the terms "same," "equal," or "parallel" used below are all allowed to have certain tolerances.

[0024] It should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of those features.

[0025] Please refer to the following: Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the welding dust removal equipment and battery cell structure of a battery production system provided in an embodiment of this application. Figure 2 for Figure 1 The diagram shows the exploded structure of the welding dust removal equipment and the battery cell.

[0026] The battery production system 1000 includes a welding dust removal device 100, a battery cell 200, and a pinning device (not shown). The battery cell 200 includes a sealing pin 201 and an end cap (not shown), with an injection hole (not shown) on the end cap. After the battery cell 200 is filled with electrolyte, the sealing pin 201 is pressed into the injection hole of the end cap using the pinning device, and the sealing pin 201 and the end cap are welded together using the welding dust removal device 100 to seal the injection hole. The welding dust removal device 100 is used to blow protective gas M and remove dust from the weld area 202 between the sealing pin 201 and the end cap, ensuring sufficient and uniform coverage of the protective gas M in the weld area 202, thereby improving the welding quality of the weld area 202. In this embodiment, the battery cell 200 is a prismatic battery.

[0027] For ease of description, the height direction of the welding dust removal equipment 100 is defined as the first direction Z, the width direction as the second direction X, and the length direction as the third direction Y. The first direction Z, the second direction X, and the third direction Y are all mutually perpendicular. In this embodiment, the welding dust removal equipment 100 is mounted on one side of the battery cell 200 along its height direction. The height direction of the welding dust removal equipment 100 is consistent with the height direction of the battery cell 200. The width direction of the welding dust removal equipment 100 is consistent with the width direction of the battery cell 200. The length direction of the welding dust removal equipment 100 is consistent with the length direction of the battery cell 200.

[0028] In some embodiments, the battery production system 1000 further includes drying equipment, winding equipment, etc. This application does not impose any limitations.

[0029] In some embodiments, the welding dust removal equipment 100 can also be used for welding dust removal of workpieces with a pressure nail groove structure other than the battery cell 200. This application does not impose any limitations.

[0030] Please combine Figure 2 , Figure 3 and Figure 4 , Figure 3 for Figure 2The diagram shown is a structural schematic of the welding dust removal equipment. Figure 4 for Figure 3 The diagram shows the exploded structure of the welding dust removal equipment.

[0031] The welding dust removal equipment 100 includes a main body 10, a welding dust removal hood 40, and multiple air inlet pipes (not shown). The main body 10 has a through hole 101 and a notch 102. Both the through hole 101 and the notch 102 penetrate both sides of the thickness direction (i.e., the first direction Z) of the main body 10. The main body 10 abuts against the battery cell 200, and the through hole 101 of the main body 10 is opposite to the sealing pin 201 of the battery cell 200. The notch 102 communicates with the through hole 101 and penetrates one side of the width direction (i.e., the second direction X) of the main body 10. The notch 102 is used for the nailing rod (not shown) of the nailing device to enter the sealing pin 201 of the battery cell 200 for sealing pin operation or to exit from the sealing pin 201. The welding dust removal hood 40 is mounted on the side of the main body 10 facing away from the battery cell 200 in the first direction Z. The welding dust removal hood 40 has a laser channel 431 and a dust removal channel 441. Dust removal channel 441 is connected to laser channel 431, and the extension directions of laser channel 431 and dust removal channel 441 are set at an angle. Laser channel 431 is coaxially connected to and communicates with through hole 101 of equipment body 10. Welding laser beam (not shown) passes through laser channel 431 and is focused on the connection between sealing nail 201 and end cap for welding sealing nail 201 and end cap. Multiple gas filling pipes are connected to through hole 101 of equipment body 10 and fill through hole 101 with protective gas M (e.g., nitrogen) to cover the weld area 202 of sealing nail 201 and end cap and reduce the influence of air N on the welding quality of weld area 202 of sealing nail 201 and end cap. Dust removal channel 441 removes dust (e.g., welding fumes) from weld area 202 of sealing nail 201 and end cap by negative pressure to ensure the welding quality of weld area 202. Simultaneously, the dust removal channel 441 can draw away some of the gas (including air N and protective gas M) inside the welding dust removal equipment 100 through negative pressure. In this embodiment, along the first direction Z, the projections of the sealing pin 201 and the weld area 202 of the end cap are located within the projection of the through hole 101, and the projections of the sealing pin 201 and the weld area 202 of the end cap are completely located within the projection of the laser channel 431, that is, the laser channel 431 completely covers the weld area 202 of the sealing pin 201 and the end cap. Moreover, the dust removal channel 441 and the notch 102 are located on opposite sides of the laser channel 431 in the second direction X, and the direction in which the dust removal channel 441 draws away the gas under negative pressure is away from the notch 102.

[0032] like Figure 3As shown, the main body 10 of the device also includes multiple inflation channels 103. Each inflation channel 103 communicates with a through hole 101, and each inflation channel 103 is used to communicate with an inflation pipe, so that the inflation pipe can fill the protective gas M from the inflation channel 103 into the through hole 101 and cover the weld area 202 in the through hole 101. In this embodiment, the number of inflation channels 103 is four. The four inflation channels 103 surround the periphery of the through hole 101 and are arranged at intervals. Correspondingly, the number of inflation pipes is four.

[0033] In this embodiment, the four inflation pipes have the same structure and dimensions, and are connected to the same interface (not shown in the figure). At the working site of the welding dust removal equipment 100, it is only necessary to adjust the interface position of the inflation pipes and ensure the unobstructed flow of the inflation pipes to ensure the consistency of the protective gas M filling each inflation channel 103 as much as possible. The fact that the four inflation pipes have the same dimensions means that parameters such as pipe length and pipe diameter are identical.

[0034] like Figure 3 and Figure 4 As shown, the main body 10 of the device includes an outer plate 1, a first plate 2, and a second plate 3. Along the first direction Z, the outer plate 1, the first plate 2, and the second plate 3 are sequentially stacked and connected. Along the first direction Z, at least a portion of the first plate 2 is embedded in the outer plate 1, and at least a portion of the edge of the first plate 2 is surrounded by the outer plate 1. At least a portion of the second plate 3 is embedded within the first plate 2, and the edge of the second plate 3 is surrounded by the first plate 2. In this embodiment, the outer plate 1, the first plate 2, and the second plate 3 are separately formed structures. In other embodiments, the outer plate 1, the first plate 2, and the second plate 3 can be integrally formed structures. This application does not impose any limitations on this.

[0035] like Figure 4 As shown, the outer plate 1 includes a first surface 11 and a second surface 12. The first surface 11 and the second surface 12 are disposed opposite to each other along the thickness direction (i.e., the first direction Z) of the outer plate 1. The outer plate 1 also includes a first side surface 13 and a second side surface 14. The first side surface 13 and the second side surface 14 are disposed opposite to each other along the width direction (i.e., the second direction X) of the outer plate 1. Both the first side surface 13 and the second side surface 14 are connected to the first surface 11 and the second surface 12.

[0036] The outer plate 1 also includes a mounting groove 15. The mounting groove 15 is recessed into the first surface 11 of the outer plate 1 and recessed towards the second surface 12. The mounting groove 15 also extends through the first side surface 13. The mounting groove 15 is used to accommodate at least a portion of the first plate 2. The outer plate 1 also includes a through hole 16. The through hole 16 extends through the bottom wall of the mounting groove 15 and the second surface 12 of the outer plate 1, and extends through the first side surface 13 of the outer plate 1. The through hole 16 is used for a portion of the first plate 2 to pass through. In this embodiment, the outer plate 1 is generally a U-shaped plate. The mounting groove 15 is generally a rectangular groove. The through hole 16 is generally a rectangular hole.

[0037] Please refer to the following: Figure 5 , Figure 6 and Figure 7 , Figure 5 for Figure 4 The diagram shows the structure of the first plate of the welding dust removal equipment. Figure 6 for Figure 5 The diagram shown is a structural schematic of the first plate from another angle. Figure 7 for Figure 5 The diagram shows a cross-sectional view of the first plate along AA.

[0038] The first plate 2 includes a first body 21. The first body 21 includes a first surface 211 and a second surface 212. The first surface 211 and the second surface 212 are disposed opposite to each other along the thickness direction (i.e., the first direction Z) of the first body 21. The first body 21 also includes a first side surface 213 and a second side surface 214. The first side surface 213 and the second side surface 214 are disposed opposite to each other along the first body 21 (i.e., the second direction X). The first side surface 213 and the second side surface 214 are both connected to the first surface 211 and the second surface 212. In this embodiment, the first body 21 is generally a rectangular plate.

[0039] The first plate 2 includes a mounting groove 22. The mounting groove 22 is recessed in the first surface 211 of the first body 21, and a mounting boss 23 is formed on the second surface 212 of the first body 21. The mounting groove 22 is used to accommodate at least a portion of the second plate 3. The mounting boss 23 is used to be confined within the through hole 16 of the outer plate 1 and abuts against the battery cell 200.

[0040] like Figure 5 and Figure 7 As shown, the assembly groove 22 includes a bottom surface 221 and a side surface 222. The bottom surface 221 faces the same direction as the first surface 211 of the first body 21. The side surface 222 connects the bottom surface 221 and the first surface 211 of the first body 21. In this embodiment, the assembly groove 22 is approximately a rectangular groove.

[0041] like Figure 6 and Figure 7As shown, the mounting boss 23 protrudes from the second surface 212 of the first body 21. It includes a boss surface 231 and a boss side surface 232. The boss surface 231 and the second surface 212 of the first body 21 have the same orientation. The boss side surface 232 connects the boss surface 231 and the second surface 212 of the first body 21. In this embodiment, the mounting boss 23 is generally a rectangular protrusion.

[0042] like Figure 5 and Figure 7 As shown, the first plate 2 also includes a receiving groove 24. The receiving groove 24 is recessed into the bottom surface 221 of the assembly groove 22 and is recessed towards the second surface 212 of the first body 21. The receiving groove 24 includes a bottom wall 241 and a side wall 242. The bottom wall 241 and the bottom surface 221 of the groove have the same orientation. The side wall 242 connects the bottom wall 241 and the bottom surface 221 of the assembly groove 22. In this embodiment, the receiving groove 24 is approximately a circular groove.

[0043] The first plate 2 also includes a plurality of support protrusions 25. The plurality of support protrusions 25 protrude from the bottom wall 241 of the receiving groove 24 and are connected to the side wall 242 of the receiving groove 24. The support protrusions 25 are used to support the second plate 3. Each support protrusion 25 includes a support ramp 251 and a support side surface 252. The support ramp 251 is connected to the side wall 242 and the support side surface 252. The support side surface 252 is connected to the bottom wall 241 of the receiving groove 24 and faces the central axis of the receiving groove 24. In this embodiment, the number of support protrusions 25 is four. The support ramp 251 of each support protrusion 25 is a ramp and is inclined towards the central axis of the receiving groove 24. It can be understood that the side wall 242 of the receiving groove 24 is provided with four support protrusions 25, and the support side surface 252 and the support ramp 251 of the four support protrusions 25 can all be regarded as part of the side wall 242 of the receiving groove 24. The sidewall 242 of the receiving groove 24 is stepped.

[0044] The first plate 2 also includes a plurality of venting grooves 26. Each venting groove 26 is recessed into the bottom surface 221 of the assembly groove 22 and is recessed toward the second surface 212 of the first body 21. The venting grooves 26 surround the periphery of the receiving groove 24 and are evenly spaced from each other. Each venting groove 26 penetrates the side wall 242 of the receiving groove 24 and communicates with the receiving groove 24. Each venting groove 26 extends radially along the receiving groove 24 and is arranged around the central axis of the receiving groove 24. Furthermore, a support protrusion 25 connects each pair of adjacent venting grooves 26. The venting grooves 26 are used to allow the shielding gas M to pass through during welding.

[0045] In this embodiment, there are approximately four ventilation slots 26, and the four ventilation slots 26 have the same structure, all being approximately arc-shaped grooves. The included angle between the extending directions of two adjacent ventilation slots 26 is 90 degrees. For example, the four ventilation slots 26 are symmetrically arranged about the central axis along the width direction of the first plate 2. The extending direction of one of the ventilation slots 26 forms a 45-degree angle with the third direction Y and a 45-degree angle with the second direction X. The extending direction of this ventilation slot 26 is symmetrical with the extending direction of the adjacent ventilation slot 26 about the third direction Y, and the extending direction of this ventilation slot 26 is symmetrical with the extending direction of the adjacent other ventilation slot 26 about the second direction X.

[0046] Each venting groove 26 includes a bottom wall surface 261 and two side wall surfaces 262. The two side wall surfaces 262 are arranged opposite to each other and spaced apart along the width direction of the venting groove 26. Both side wall surfaces 262 are connected to the bottom wall surface 261 and to the bottom surface 221 of the assembly groove 22, the side wall 242 of the receiving groove 24, and the supporting side surface 252 of the supporting protrusion 25. The bottom wall surface 261 is connected to the bottom surface 221 of the assembly groove 22 and the bottom wall 241 of the receiving groove 24. In this embodiment, a portion of the bottom wall surface 261 is a plane and is connected to the bottom wall 241. Another portion of the bottom wall surface 261 is an arc-shaped surface and is connected to the bottom surface 221. It can be understood that the groove depth of the venting groove 26 gradually decreases in the radial direction away from the central axis of the receiving groove 24.

[0047] like Figure 5 , Figure 6 and Figure 7 As shown, the first plate 2 also includes a first through hole 27. The first through hole 27 penetrates the bottom wall 241 of the receiving groove 24 and the second surface 212 of the first body 21. The first through hole 27 constitutes part of the through hole 101 of the equipment body 10 and is used to allow the shielding gas M to pass through during welding. In this embodiment, the first through hole 27 is approximately circular. The first through hole 27 is coaxially arranged and connected with the receiving groove 24. A guide surface m is formed between the hole wall surface of the first through hole 27 and the bottom wall 241 of the receiving groove 24. The guide surface m is set at an angle to both the hole wall surface of the first through hole 27 and the bottom wall 241 of the receiving groove 24. The guide surface m is used to guide the shielding gas M in the receiving groove 24 to the first through hole 27. It can be understood that the guide surface m is an annular inclined surface and is inclined towards the central axis of the first through hole 27.

[0048] like Figure 5 and Figure 6As shown, the first plate 2 also includes a first notch 28. Along the second direction X, the first notch 28 is recessed into the first side surface 213 of the first body 21 and recessed towards the second side surface 214. The first notch 28 penetrates the first surface 211 and the second surface 212 of the first body 21, and also penetrates the bottom surface 221 and side surface 222 of the mounting groove 22, the side wall 242 and bottom wall 241 of the receiving groove 24, the supporting inclined surface 251 and supporting side surface 252 of a supporting protrusion 25 adjacent to the first side surface 213, and the hole wall surface of the first through hole 27. The first notch 28 and the first through hole 27 are connected. The first notch 28 constitutes a partial notch 102 of the device body 10 and is used to avoid the pressing device, facilitating the entry and exit of the pressing device at the sealing nail 201. It can be understood that the first notch 28 extends from one side of the width direction of the first plate 2 along the second direction X to the first through hole 27. The extension direction of the first notch 28 is consistent with the central axis direction of the width direction of the first body 21.

[0049] The first notch 28 includes a first segment 281 and a second segment 282. The first segment 281 and the second segment 282 are connected and communicate along the second direction X. The second segment 282 communicates with the first through hole 27. The first segment 281 is further away from the first through hole 27 than the second segment 282. A step is formed between the first segment 281 and the second segment 282, such that the cross-sectional area of ​​the first segment 281 is larger than that of the second segment 282, and this step can, to a certain extent, block air N from entering the first through hole 27 through the first notch 28, thereby reducing the impact of air N on the sealing nail 201 and the weld area 202 of the end cap and ensuring the welding quality.

[0050] In this embodiment, the first notch 28 interrupts the through support protrusion 25. Two blocks a protrude from the support side 252 of the support protrusion 25 near the first notch 28. The two blocks a are connected to the bottom wall 241 of the receiving groove 24, and both blocks a extend to the outer edge of the guide surface m. The blocks a prevent the protective gas M, which is filled into the receiving groove 24 from the venting groove 26, from flowing out of the first notch 28, and allow more of the protective gas M to flow towards the first through hole 27. They also prevent air N from entering the first through hole 27 from the first notch 28, ensuring the protective gas M effectively covers the weld area 202 of the sealing nail 201 and the end cap, thereby guaranteeing the welding quality. Furthermore, the first notch 28 interrupts the side wall 242 of the receiving groove 24 between the two venting grooves 26, and two baffles b protrude from the side wall 242 of the receiving groove 24 near the first notch 28. Each baffle b is connected to a support ramp 251 of a support protrusion 25 interrupted by the first notch 28. Both baffles b are used to abut against the second plate 3, and both baffles b can prevent air N entering the welding dust removal equipment 100 through the first notch 28 from interfering with the protective gas M. It can be understood that the baffle a and baffle b cooperate to prevent the protective gas M from mixing with the air N, thus avoiding affecting the injection of the protective gas M from the air filling channel 103 into the weld area 202 of the sealing nail 201.

[0051] Please refer to the following: Figure 8 and Figure 9 , Figure 8 for Figure 4 The diagram shows the structure of the second plate of the welding dust removal equipment. Figure 9 for Figure 8 The diagram shows the structure of the second plate at another angle.

[0052] The second plate 3 includes a second body 31. The second body 31 includes a third surface 311 and a fourth surface 312. The third surface 311 and the fourth surface 312 are disposed opposite to each other along the thickness direction (i.e., the first direction Z) of the second body 31. The second body 31 also includes a third side surface 313 and a fourth side surface 314. The third side surface 313 and the fourth side surface 314 are disposed opposite to each other along the width direction (i.e., the second direction X) of the second body 31. The third side surface 313 and the fourth side surface 314 are both connected to the third surface 311 and the fourth surface 312. In this embodiment, the second body 31 is generally a rectangular plate.

[0053] like Figure 9As shown, the second plate 3 also includes a limiting protrusion 32. The limiting protrusion 32 protrudes from the fourth surface 312 of the second body 31. The limiting protrusion 32 includes a limiting surface 321 and a limiting peripheral surface 322. The limiting surface 321 and the fourth surface 312 of the second body 31 have the same orientation. The limiting peripheral surface 322 connects the limiting surface 321 and the fourth surface 312, and the limiting peripheral surface 322 is set at an angle to the limiting surface 321. In this embodiment, the limiting protrusion 32 is approximately a circular bulge. The limiting surface 321 is inclined relative to the limiting peripheral surface 322 towards the central axis of the limiting protrusion 32. It can be understood that the limiting surface 321 is an inclined surface.

[0054] The second plate 3 also includes multiple extending protrusions 33. These multiple extending protrusions 33 all protrude from the fourth surface 312 of the second body 31, and are connected to the limiting peripheral surface 322 of the limiting protrusion 32. The multiple extending protrusions 33 extend radially along the limiting protrusion 32. The multiple extending protrusions 33 are evenly spaced around the central axis of the limiting protrusion 32, and extend away from the central axis of the limiting protrusion 32. Alternatively, the limiting peripheral surface 322 of the limiting protrusion 32 is provided with multiple extending protrusions 33, and these multiple extending protrusions 33 are connected to the fourth surface 312 of the second body 31. The number of extending protrusions 33 is the same as the number of vent grooves 26 in the first plate 2.

[0055] In this embodiment, there are four extending protrusions 33, and the four extending protrusions 33 have the same structure, all being approximately wedge-shaped protrusions. Each extending protrusion 33 includes an extending surface 331. The extending surface 331 faces the same direction as the fourth surface 312 of the second body 31, and the extending surface 331 is connected to the limiting surface 321 of the limiting protrusion 32 and the fourth surface 312 of the second body 31. It can be understood that the extending surface 331 is an inclined surface.

[0056] In this embodiment, the angle formed between the extension directions of two adjacent extension protrusions 33 is 90 degrees. The height of each extension protrusion 33 gradually decreases along the central axis away from the limiting protrusion 32. For example, the four extension protrusions 33 are symmetrically arranged about the central axis along the width direction of the second plate 3. One extension protrusion 33 has an extension direction at a 45-degree angle to the third direction Y and a 45-degree angle to the second direction X. The extension direction of this extension protrusion 33 is symmetrically arranged with the extension direction of an adjacent extension protrusion 33 about the third direction Y, and the extension direction of this extension protrusion 33 is symmetrically arranged with the extension direction of another adjacent extension protrusion 33 about the second direction X.

[0057] like Figure 8 and Figure 9As shown, the second plate 3 also includes a plurality of vent holes 34. Each vent hole 34 penetrates the third surface 311 of the second body 31 and the extension surface 331 of an extension protrusion 33. Alternatively, the plurality of vent holes 34 can be considered to penetrate both surfaces of the second plate 3 in the thickness direction. In the radial direction of the limiting protrusion 32, each vent hole 34 is located at the end of an extension protrusion 33 away from the limiting protrusion 32, and the edge of one vent hole 34 is connected to one of the limiting protrusions 32. Each vent hole 34 is used to communicate with an inflation pipe and to allow protective gas M to pass through the inflation pipe. The number of vent holes 34 is the same as the number of extension protrusions 33. In this embodiment, the number of vent holes 34 is four.

[0058] The second plate 3 also includes a second through hole 35. The second through hole 35 penetrates the third surface 311 of the second plate 3 and the limiting surface 321 of the limiting protrusion 32. The second through hole 35 constitutes part of the through hole 101 of the main body 10 of the equipment and is used to allow part of the shielding gas M, air N and welding fumes to pass through during welding. The second through hole 35 includes a first opening 351 and a second opening 352. The first opening 351 is located on the third surface 311 of the second body 31. The second opening 352 is located on the limiting surface 321 of the limiting protrusion 32. Along the direction from the first opening 351 to the second opening 352, the cross-sectional area of ​​the second through hole 35 gradually decreases. In this embodiment, the second through hole 35 is a funnel-shaped hole, and both the first opening 351 and the second opening 352 are approximately circular openings. The second through hole 35 is coaxially arranged with the limiting protrusion 32.

[0059] The second plate 3 also includes a second notch 36. Along the second direction X, the second notch 36 is recessed into the third side surface 313 of the second body 31 and extends towards the fourth side surface 314. The second notch 36 penetrates the third side surface 311 and the fourth side surface 312 of the second body 31, and penetrates the hole wall surface of the second through hole 35, the limiting peripheral surface 322 of the limiting protrusion 32, and the limiting surface 321. The second notch 36 communicates with the second through hole 35. The second notch 36 forms a partial notch 102 in the device body 10 and is used to avoid the pressing device, facilitating the entry and exit of the pressing device at the sealing nail 201. It is understood that the second notch 36 extends from one side of the second plate 3 along the second direction X to the second through hole 35. The extension direction of the second notch 36 is consistent with the central axis direction of the second plate 3 in the width direction.

[0060] The second notch 36 includes a third segment 361 and a fourth segment 362. The third segment 361 and the fourth segment 362 are connected and communicate along the second direction X. The fourth segment 362 communicates with the second through hole 35. The third segment 361 is further away from the second through hole 35 than the fourth segment 362. A step is formed between the third segment 361 and the fourth segment 362, making the cross-sectional area of ​​the third segment 361 larger than that of the fourth segment 362. This step also helps to prevent air N from entering the second through hole 35 through the second notch 36, thus reducing the impact of air N on the sealing pin 201 and the end cap weld area 202, and ensuring welding quality.

[0061] Please refer to the following: Figure 4 and Figure 10 , Figure 10 for Figure 4 The diagram shows the structure of the welding dust removal hood of the welding dust removal equipment from another angle.

[0062] The welding dust hood 40 includes a connecting plate 41 and a tube 42. The connecting plate 41 includes a first connecting surface 411 and a second connecting surface 412. The first connecting surface 411 and the second connecting surface 412 are arranged facing away from each other along the thickness direction (i.e., the first direction Z) of the connecting plate 41. The connecting plate 41 also includes a connecting hole 413. The connecting hole 413 passes through the first connecting surface 411 and the second connecting surface 412 of the connecting plate 41. The tube 42 protrudes from the first connecting surface 411 of the connecting plate 41, and the tube 42 surrounds and is connected to the periphery of the connecting hole 413. The tube 42 and the connecting hole 413 are in communication. In this embodiment, the connecting plate 41 is generally a rectangular plate.

[0063] The tube body 42 includes a welded tube 43. The welded tube 43 forms a laser channel 431 and a weld joint 432. One end of the laser channel 431 communicates with the connecting hole 413, and the other end is the weld joint 432. The weld joint 432 communicates with the laser channel 431 and is coaxially arranged with the connecting hole 413. Both the laser channel 431 and the weld joint 432 are used to provide a transmission channel for the welding laser beam, ensuring that the welding laser beam can be accurately focused on the connection between the sealing nail 201 and the end cap. In this embodiment, the welded tube 43 is approximately circular, and the extension direction of the welded tube 43 is approximately the same as the first direction Z.

[0064] The tube body 42 also includes a dust removal tube 44. The extension direction of the dust removal tube 44 is set at an angle to the extension direction of the welding tube 43. The dust removal tube 44 forms a dust removal channel 441, a dust removal port 442, and a through port 443. The through port 443 and the dust removal port 442 are located at opposite ends of the length direction of the dust removal channel 441, and both the through port 443 and the dust removal port 442 are connected to the dust removal channel 441. The through port 443 is located on the tube wall of the welding tube 43 and is connected to the laser channel 431, and the through port 443 and the welding port 432 are spaced apart. The dust removal port 442 faces away from the welding tube 43. It can be understood that the tube wall of the dust removal tube 44 is connected to the tube wall of the welding tube 43. The laser channel 431 of the welding tube 43 is connected to the dust removal channel 441 of the dust removal tube 44 through the through port 443, and the extension direction of the laser channel 431 and the extension direction of the dust removal channel 441 are set at an angle.

[0065] In this embodiment, the welded pipe 43 and the dust removal pipe 44 can be integrally formed. In some embodiments, the welded pipe 43 and the dust removal pipe 44 can be separately formed, such as the welded pipe 43 and the dust removal pipe 44 can be manufactured separately and then connected by welding to form the pipe body 42. This application does not impose any limitations.

[0066] Please refer to the following: Figure 3 , Figure 11 and Figure 12 , Figure 11 for Figure 3 The diagram shows a cross-sectional view of the welding dust removal equipment along BB. Figure 12 for Figure 3 The diagram shows a cross-sectional view of the welding dust removal equipment along the CC direction.

[0067] The first plate 2 is assembled with the outer plate 1. The first body 21 of the first plate 2 is housed in the mounting groove 15 of the outer plate 1, and the second surface 212 of the first body 21 abuts against the bottom wall of the mounting groove 15. The first side surface 213 of the first body 21 faces the same direction as the first side surface 13 of the outer plate 1. The mounting boss 23 of the first plate 2 passes through the through hole 16 of the outer plate 1, and the boss surface 231 of the mounting boss 23 protrudes from the second surface 12 of the outer plate 1 to facilitate welding the dust removal equipment 100 and the battery cell 200. In this embodiment, the first body 21 and the outer plate 1 can be connected by means not limited to screws, so that the first plate 2 and the outer plate 1 are fixedly connected.

[0068] The second plate 3 is mounted on the first plate 2. The second body 31 of the second plate 3 is accommodated in the mounting groove 22 of the first plate 2, and the fourth surface 312 of the second body 31 abuts against the bottom surface 221 of the mounting groove 22. The third side surface 313 of the second body 31 faces the same direction as the first side surface 213 of the first body 21. In this embodiment, the second body 31 and the first plate 2 are connected by means not limited to screws, so that the second plate 3 and the first plate 2 are fixedly connected.

[0069] The limiting protrusion 32 of the second plate 3 is housed within the receiving groove 24 of the first plate 2. The limiting peripheral surface 322 of the limiting protrusion 32 abuts against the side wall 242 of the receiving groove 24. A portion of the limiting surface 321 of the limiting protrusion 32 abuts against the supporting inclined surface 251 of the supporting protrusion 25, and the other portion is opposite to and spaced apart from the bottom wall 241 and the guide surface m of the receiving groove 24. The second through hole 35 of the second plate 3 is coaxially arranged and connected with the first through hole 27 of the first plate 2. The first through hole 27 and the second through hole 35 together constitute the through hole 101 of the device body 10.

[0070] Each extended protrusion 33 of the second plate 3 is housed within a vent groove 26 of the first plate 2, and each vent hole 34 of the second plate 3 is correspondingly provided and connected to a vent groove 26 of the first plate 2. The extended surface 331 of the extended protrusion 33 is opposite to and spaced apart from the bottom wall surface 261 of the vent groove 26. The gap between the extended protrusion 33 and the vent groove 26, as well as the vent holes 34, forms an inflation channel 103. The inflation channel 103 is connected to the receiving groove 24 and the first through hole 27. It can be understood that the protective gas M in the inflation channel 103 can flow directly from the inflation channel 103 to the first through hole 27, or it can flow around the first through hole 27 through the receiving groove 24. Moreover, the four inflation channels 103 of the equipment body 10 are evenly distributed around the first through hole 27, which can ensure the uniformity of the protective gas M entering the first through hole 27 and ensure the stability of the welding of the sealing nail 201 and the end cap.

[0071] like Figure 3 As shown, the second notch 36 of the second plate 3 and the first notch 28 of the first plate 2 are opposite to each other and connected. The first notch 28 and the second notch 36 together form the notch 102 of the main body 10 of the device. The fourth segment 362 of the second notch 36 is connected to the second segment 282 of the first notch 28. The third segment 361 of the second notch 36 is connected to the first segment 281 of the first notch 28. Figure 3 As shown, the two relatively spaced surfaces of the fourth segment 362 abut against the two opposing surfaces of the two baffles b of the first plate 2, further confining the second plate 3 onto the first plate 2.

[0072] like Figure 3 and Figure 11As shown, the welding dust hood 40 is mounted on the second plate 3. The second connecting surface 412 of the connecting plate 41 abuts against the third surface 311 of the second plate 3, and the connecting plate 41 and the second plate 3 can be connected by means not limited to screws, so that the welding dust hood 40 is fixedly connected to the second plate 3. The four air holes 34 on the connecting plate 41 and the second plate 3 are staggered to avoid obstructing the air filling pipe (not shown) from filling the air holes 34. The connecting hole 413 of the connecting plate 41 is coaxially arranged with the second through hole 35 of the second plate 3, and the connecting hole 413 communicates with the second through hole 35 through the first opening 351 of the second through hole 35. Along the second direction X, the dust removal pipe 44 is located on the side of the welding pipe 43 facing away from the notch 102. That is, the dust removal port 442 of the dust removal pipe 44 is located directly opposite the notch 102 in the second direction X.

[0073] In this embodiment, each inflation pipe is connected to an air passage 34 of the second plate 3. When the welding dust removal equipment 100 is working, the inflation pipe can fill the inflation channel 103 of the equipment body 10 with protective gas M through the air passage 34, so that the protective gas M covers the weld area 202 of the sealing nail 201 and the end cap, ensuring the welding quality.

[0074] Please refer to the following: Figure 1 , Figure 13 , Figure 14 and Figure 15 , Figure 13 for Figure 1 The diagram shows the welding dust removal equipment and the battery cell's cross-sectional structure along DD. Figure 14 for Figure 4 The top view of the first plate shown. Figure 15 for Figure 1 The diagram shows a partial cross-sectional view of the welding dust removal equipment and the battery cell along the EE. Among them, Figure 13 and Figure 14 The arrows in the diagram indicate the approximate direction of movement of the protective gas. Figure 15 The arrows in the diagram indicate the direction of air movement.

[0075] like Figure 1 As shown, the welding dust removal device 100 is installed on the battery cell 200, and the through hole 101 of the welding dust removal device 100 and the sealing nail 201 of the battery cell 200 are arranged opposite each other along the first direction Z.

[0076] Specifically, such as Figure 13 and Figure 15As shown, the mounting boss 23 of the first plate 2 supports the battery cell 200, and the boss surface 231 of the mounting boss 23 abuts against the surface of the battery cell 200. The first through hole 27 and the sealing pin 201 are arranged opposite each other. That is, the laser channel 431 and the welding port 432 of the welding tube 43 are arranged opposite to the sealing pin 201. Through the welding port 432 and the laser channel 431 of the welding tube 43, the welding laser beam can be focused on the connection between the sealing pin 201 and the end cap, and the sealing pin 201 and the end cap can be welded. In this embodiment, in the first direction Z, the projection of the sealing pin 201 and the projection of the weld area 202 between the sealing pin 201 and the end cap are completely located within the projection of the first through hole 27, so as to ensure the coverage effect of the subsequently filled protective gas M on the weld area 202.

[0077] like Figure 13 As shown, protective gas M is injected into the inflation channel 103 of the main body 10 of the equipment through the inflation pipe. The protective gas M passes through the air passage 34 of the second plate 3, the air groove 26 of the first plate 2, the accommodating groove 24 and the first through hole 27 in sequence, and covers the weld area 202 of the sealing nail 201 and the end cover, so as to reduce the influence of air N on the weld area 202 and ensure the welding quality of the sealing nail 201 and the end cover.

[0078] In this embodiment, a portion of the bottom wall surface 261 of the venting groove 26 is designed with an arc shape to reduce the eddies generated when the protective gas M enters the venting groove 26 from the venting hole 34. This reduces the energy loss of the protective gas M supply and facilitates the ejection of the protective gas M from the filling channel 103 into the weld area 202 at a certain speed, thus better covering the weld area 202. The certain speed ensures that the protective gas M is ejected from the filling channel 103 into the weld area 202 and completely covers the weld area 202.

[0079] In this embodiment, as Figure 13 and Figure 14 As shown, the protective gas M, which is filled into the receiving groove 24 from the venting groove 26, can be ejected at a corresponding angle into the weld area 202 in the first through hole 27 under the action of the guide surface m and the limiting surface 321 of the limiting protrusion 32; at the same time, as Figure 14 and Figure 15 As shown, the protective gas M, which is directly injected into the first through hole 27 from the vent groove 26, can be ejected into the weld area 202 within the first through hole 27 at a corresponding angle under the action of the guide surface m and the extension surface 331 of the extension protrusion 33. This ensures that the protective gas M can completely cover the weld area 202 as much as possible, reducing the influence of air N on the weld area 202 and improving welding quality. The corresponding angle is sufficient to allow the protective gas M to be ejected from the through hole 101 into the weld area 202 and completely cover it.

[0080] In addition, such as Figure 14 As shown, the baffle a of the first plate 2 extends to the edge of the guide surface m. The protective gas M that is filled into the receiving groove 24 from the venting groove 26 can be blocked by the baffle a, so that more of the protective gas M flows along the surface of the baffle a into the first through hole 27, instead of flowing out from the first notch 28. At the same time, the two baffles b of the first plate 2 not only limit the second plate 3 to the first plate 2, but also prevent the air N entering the welding dust removal equipment 100 through the notch 102 from interfering with the protective gas M. In this embodiment, the first plate 2 is provided with baffles a and b, which not only greatly increases the concentration of protective gas M in the weld area 202, but also prevents air N from entering the through hole 101 from the notch 102, thereby improving the coverage effect of the protective gas M on the weld area 202 and ensuring the welding quality. In this embodiment, the minimum concentration of protective gas M in the weld area 202 is greater than or equal to 0.9.

[0081] Typically, during the welding of the sealing nail 201 and the end cap, negative pressure is applied at one end of the dust removal port 442 of the dust removal pipe 44 to remove welding fumes from the weld area 202. This reduces the impact of welding fumes on the welding quality of the sealing nail 201 and the end cap, and also mitigates the impact of harmful substances generated during the welding process on on-site personnel or the equipment itself. Furthermore, during the negative pressure dust removal process, the negative pressure also removes a portion of the protective gas M from the weld area 202. Simultaneously, air N, under the influence of the airflow, is drawn in from the notch 102 and the weld port 432 of the welding pipe 43, and along with a portion of the protective gas M, is drawn away through the dust removal channel 441 and from the dust removal port 442.

[0082] In this embodiment, as Figure 15 As shown, the dust removal port 442 of the dust removal pipe 44 is positioned directly opposite the notch 102 in the second direction X. When negative pressure dust removal is applied to one side of the dust removal port 442, due to the symmetrical characteristics of the airflow, air N will be drawn in from the notch 102 and the welding port 432 of the welding pipe 43, and can be directly drawn into the dust removal channel 441 and then drawn away through the dust removal port 442. This reduces the chance of air N forming eddies in and around the weld area 202 after entering the welding dust removal equipment 100, avoids air N disturbing the flow field of the shielding gas M in and around the weld area 202, and thus prevents the flow field of the shielding gas M from becoming turbulent. This greatly weakens the influence of air N on the flow field of the weld area 202 and the shielding gas M in and around the weld area 202, and can even minimize the influence of air N on the weld area 202 and the shielding gas M in the weld area 202, ensuring the coverage effect of the shielding gas M on the weld area 202, thereby greatly improving the welding quality of the sealing nail 201 and the end cap.

[0083] In some embodiments, the welding dust removal equipment 100 further includes an auxiliary spraying device (not shown). The auxiliary spraying device is disposed within the notch 102 of the equipment body 10 and fixed to the first plate 2, the second plate 3, or the connecting plate 41 of the welding dust removal hood 40. The auxiliary spraying device can eject protective gas M along a direction opposite to the central axis of the through hole 101, and the spraying direction of the protective gas M is set at an angle to the central axis of the through hole 101. The protective gas M ejected by the auxiliary spraying device can prevent air N from being drawn into the welding dust removal equipment 100 from the notch 102, thereby reducing the impact of air N on the weld area 202 and improving the welding quality of the sealing nail 201 and the end cap. In this embodiment, the auxiliary spraying device can be, but is not limited to, an annular micro-spray tube.

[0084] In related technologies, the battery's sealing pin is inserted into the liquid injection hole of the end cap, and laser welding is required to connect the sealing pin and the end cap. However, before laser welding the sealing pin and end cap using welding equipment, the sealing pin needs to be pressed into the liquid injection hole using a pressing device. After the pressing device is withdrawn, a pressing groove notch is formed on the welding equipment. Existing dust removal ports are located on the same side as the pressing groove notch, or on both sides of the width of the pressing groove notch. Because the dust removal port of the welding equipment has a negative pressure effect, a large amount of air is drawn in from the pressing groove notch, and the shielding gas in the weld area flows towards the dust removal port side, resulting in extremely low shielding gas concentration in and around the weld area. Moreover, the collision between the drawn-in air and the shielding gas in the weld area within the welding equipment creates eddies, causing turbulence in the shielding gas flow field in and around the weld area; thus affecting the welding quality of the sealing pin and end cap.

[0085] In this embodiment, the welding dust removal equipment 100 optimizes the position of the dust removal port 442. The dust removal port 442 of the welding dust removal hood 40 is located directly opposite the notch 102 of the main body 10 in the second direction X. When the dust removal port 442 is subjected to negative pressure dust removal, while a portion of the protective gas M in the weld area 202 and the welding fumes are sucked away, air N is also drawn in from the notch 102 and the welding port 432 of the welding pipe 43. Utilizing the symmetrical characteristics of the airflow, the sucked-in air N can be directly drawn away by the dust removal port 442 through the dust removal channel 441, effectively balancing the air pressure in the weld area 202, reducing the interference of the negative pressure of dust removal on the protective gas M layer, and preventing the protective gas M from being excessively sucked in by the negative pressure before passing through the weld area 202. This increases the concentration of the protective gas M in and around the weld area 202, ensuring the coverage effect of the protective gas M on the weld area 202, thereby improving the welding quality of the sealing nail 201 and the end cap.

[0086] Furthermore, in the existing technology, the parameters such as the length and diameter of multiple air-filling pipes cannot be kept consistent, which leads to inconsistent protective gas filling into multiple air-filling pipes. This results in poor uniformity of the protective gas in the weld area, affecting the welding quality of the sealing nails and end caps.

[0087] In this embodiment, the dimensions of multiple inflation pipes are kept consistent, and the multiple inflation pipes are connected to the same interface. This allows the welding dust removal equipment 100 to ensure, at the work site, only require adjusting the interface position of the inflation pipes and ensuring the unobstructed flow of the inflation pipes, thereby maximizing the consistency of the protective gas M entering each inflation channel 103. Simultaneously, the multiple inflation channels 103 of the equipment body 10 have identical structures and are arranged in a four-point configuration around the through hole 101. The multiple inflation channels 103 are evenly spaced, ensuring the uniformity of the protective gas M entering the weld area 202, guaranteeing the stability of the welding of the sealing nail 201 and the end cap, and thus ensuring the welding quality.

[0088] In summary, by optimizing the location of the dust removal port 442 and designing the structure of the inflation pipe and inflation channel 103 through which the protective gas M passes, this application can ensure the coverage effect of the protective gas M on the weld area 202 of the sealing nail 201 and the end cap, thereby ensuring the welding quality. Therefore, there is no need to carry out large-scale modifications to the welding dust removal equipment 100, saving costs and making it easy to implement and promote the application of the welding dust removal equipment 100 in the battery production system 1000.

[0089] The above are merely some embodiments and implementation methods of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A welding dust removal device for welding dust removal in the weld area of ​​sealing nails, characterized in that, The welding dust removal equipment includes: The device body includes a through hole and a notch, both of which penetrate two surfaces of the device body in a first direction. The notch penetrates one surface of the device body in a second direction and extends along the second direction, communicating with the through hole; wherein the first direction and the second direction are perpendicular. A welding dust removal hood includes a laser channel and a dust removal channel. The laser channel extends along a first direction, and the extension direction of the dust removal channel is set at an angle to the extension direction of the laser channel, and the dust removal channel and the laser channel are connected. The main body of the device is mounted on a structure with the sealing nail. Along the first direction, the through hole is opposite to the sealing nail, and the projections of the sealing nail and the weld area of ​​the sealing nail are completely located within the projection of the through hole. The welding dust removal hood is mounted on the side of the main body of the device facing away from the sealing nail. The laser channel is coaxially arranged and connected with the through hole. In the second direction, the dust removal channel and the notch are located on opposite sides of the laser channel.

2. The welding dust removal equipment according to claim 1, characterized in that, The main body of the device also includes multiple inflation channels, each of which is connected to the through hole. The multiple inflation channels are arranged around the periphery of the through hole and are spaced apart from each other. The multiple inflation channels extend away from the central axis of the through hole. The welding dust removal equipment also includes multiple air-filling pipes, each of which is connected to an air-filling channel and fills the air-filling channel with protective gas so that the protective gas covers the weld area of ​​the sealing nail.

3. The welding dust removal equipment according to claim 2, characterized in that, All of the inflation tubes are the same size and are connected to the same interface.

4. The welding dust removal equipment according to claim 2, characterized in that, The two adjacent inflation channels extend in perpendicular directions.

5. The welding dust removal equipment according to any one of claims 1-4, characterized in that, The main body of the device includes a first plate and a second plate, the first plate and the second plate are stacked and connected along the first direction, and at least a portion of the second plate is embedded in the first plate and surrounded by the first plate; The first plate includes a plurality of ventilation slots and a receiving slot. The plurality of ventilation slots and the receiving slots are all recessed on the same surface of the first plate in the first direction. The plurality of ventilation slots are arranged around the periphery of the receiving slot and spaced apart from each other. The plurality of ventilation slots penetrate the side wall of the receiving slot and communicate with the receiving slot. The second plate includes a plurality of air holes, which are all through the two surfaces of the second plate in the first direction. Each air hole is connected to a ventilation groove and an inflation pipe, and the interval between each air hole and the second plate and the ventilation groove forms an inflation channel, which is connected to the receiving groove.

6. The welding dust removal equipment according to claim 5, characterized in that, The ventilation groove has a bottom wall and a side wall. The side wall is connected to the side wall of the receiving groove. The bottom wall is connected to the side wall and the bottom wall of the receiving groove. A portion of the bottom wall away from the bottom wall is arc-shaped.

7. The welding dust removal equipment according to claim 5, characterized in that, The first plate further includes a first through hole and a first notch. The first through hole and the first notch both penetrate the two surfaces of the first plate in the first direction. The first through hole is located on the bottom wall of the receiving groove and communicates with the receiving groove. The first notch penetrates the side wall of the receiving groove and the hole wall of the first through hole, and the first notch communicates with the first through hole. The second plate further includes a second through hole and a second notch, both of which penetrate the two surfaces of the second plate in the first direction. The second notch penetrates the hole wall of the second through hole, and the second notch and the second through hole are connected. The first through hole and the second through hole are coaxially arranged and connected to form the through hole. The first notch and the second notch extend in the same direction. The first notch and the second notch are arranged opposite to each other in the first direction and connected to form the notch.

8. The welding dust removal equipment according to claim 7, characterized in that, A guide surface is formed between the hole wall of the first through hole and the bottom wall of the receiving groove, and the guide surface is set at an angle to the hole wall of the first through hole and the bottom wall of the receiving groove.

9. The welding dust removal equipment according to claim 7, characterized in that, The first plate also includes a plurality of support protrusions. Each sidewall of the receiving groove between two adjacent ventilation grooves is provided with a support protrusion. Each support protrusion includes a support slope and a support side. The support side is connected to the bottom wall of the receiving groove and faces the central axis of the receiving groove. The support slope is connected to the support side and the sidewall. The first notch penetrates the support slope and the support side of the support protrusion, and two blocks are respectively protruding on the support side of the support protrusion near the first notch, and both blocks extend to the edge of the first through hole.

10. The welding dust removal equipment according to claim 9, characterized in that, Two baffles are respectively provided on the sidewalls of the receiving groove near the first notch, and both baffles are connected to the supporting inclined surface of the supporting protrusion.

11. The welding dust removal equipment according to claim 1, characterized in that, The welding dust removal equipment also includes an auxiliary spraying device, which is disposed in the notch of the main body of the equipment and fixedly connected to the main body of the equipment. The auxiliary spraying device can eject protective gas along the central axis direction away from the through hole, and the spraying direction of the protective gas is set at an angle to the central axis direction of the through hole.

12. A battery production system, characterized in that, The battery production system includes a battery cell and a welding dust removal device as described in any one of claims 1-11. The battery cell includes an end cap and a sealing pin. The end cap has a liquid injection hole. The sealing pin is inserted into the liquid injection hole and welded to the end cap around the liquid injection hole. The welding dust removal device is mounted on the battery cell. In the first direction, the through hole of the welding dust removal device is directly opposite the sealing pin, and the projections of the sealing pin and its weld area are completely located within the projection of the through hole of the welding dust removal device. The gas filling pipe fills the weld area with protective gas through the gas filling channel. The dust removal channel is under negative pressure at one end opposite to the laser channel to remove dust from the weld area and suck away part of the protective gas and the air sucked in through the laser channel and the notch.

13. The battery production system according to claim 12, characterized in that, The concentration of the protective gas in the weld area is greater than or equal to 0.9.

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