Welding pressure head device and welding equipment

Abstract

The utility model belongs to the technical field of laser processing, and particularly relates to a welding pressure head device and welding equipment, and the welding pressure head device provided by the embodiment of the utility model comprises a bottom plate and a pressure head assembly. The bottom plate is provided with a first welding hole, an air channel is arranged in the bottom plate and communicated with the first welding hole, the bottom plate is provided with an air inlet and an air outlet which are communicated with the air channel, the pressure head assembly is installed on the bottom plate, the pressure head assembly is used for pressing a workpiece to be welded, the pressure head assembly is provided with a second welding hole, and the second welding hole is communicated with the air channel. The second welding hole is communicated with the first welding hole so that laser can penetrate through the second welding hole. The welding equipment comprises the welding pressure head device. The lap-jointed tabs on the soft package battery are pressed through the pressing head assembly, gaps are prevented from occurring between the lap-jointed tabs, and the welding quality is improved.

Description

Technical Field

[0001] The present application belongs to the field of laser processing technology, and more specifically, relates to a welding head device and welding equipment. Background Art

[0002] In the lithium battery industry, especially the power battery industry, multiple batteries need to be combined into battery modules, i.e., power battery packs, through connectors for market application. Power batteries mainly include cylindrical batteries, square-shell batteries, and soft-pack batteries. Among them, soft-pack batteries are increasingly in demand in the market due to their high energy density and suitability for fast charging. In the process of assembling soft-pack batteries into soft-pack modules, the tabs of the overlapped soft-pack batteries need to be welded. Currently, the commonly used welding method in the industry is laser welding, but since there may be gaps between the overlapped tabs, laser welding may cause problems of cold welding. Utility Model Content

[0003] The embodiments of the present application provide a welding pressure head device and welding equipment, which press the overlapped tabs on the soft-pack battery through the pressure head assembly to prevent gaps from appearing between the overlapped tabs and improve the welding quality.

[0004] The technical solution adopted in the embodiment of the present application is to provide a welding pressure head device, including:

[0005] A bottom plate is provided with a first welding hole, an air passage is provided in the bottom plate, the air passage is communicated with the first welding hole, and an air inlet and an air outlet communicated with the air passage are opened on the bottom plate;

[0006] The pressing head assembly is installed on the bottom plate and is used to press the workpiece to be welded. The pressing head assembly is provided with a second welding hole, which is connected to the first welding hole to transmit the laser.

[0007] Optionally, the air outlet is opposite to the second welding hole.

[0008] Optionally, the base plate includes a main body and an extension portion, the extension portion is provided on a side of the main body facing the pressure head assembly, and the air outlet is provided on the extension portion.

[0009] Optionally, the air channel includes a main channel and several branch channels, several of the branch channels are connected to the air inlet, the main channel is connected to several of the branch channels, the length direction of the main channel is parallel to the length direction of the pressure head assembly, and the air outlet is opened on the side wall of the main channel and is arranged along the length direction of the main channel.

[0010] Optionally, the branch channel includes a first branch channel and a second branch channel, the length direction of the first branch channel is perpendicular to the length direction of the second welding hole, the length direction of the second branch channel is parallel to the length direction of the second welding hole, the first branch channel is connected to the air inlet, the first branch channel is connected to the second branch channel, and the second branch channel is connected to the main channel.

[0011] Optionally, the width of the air outlet is smaller than the channel width of the branch channel.

[0012] Optionally, the welding pressure head device is used in conjunction with a welding device, the laser emitted by the welding device passes through the first welding hole and the second welding hole in sequence, and the air inlet is arranged on the side of the base plate away from the welding device or the side away from the first welding hole.

[0013] Optionally, the pressing head assembly includes a plurality of pressing parts, and the plurality of pressing parts are arranged in parallel.

[0014] Optionally, the pressing part includes a mounting part and a pressing head body, the pressing head body is connected to the mounting part, the mounting part is installed on the base plate, the pressing head body is made of elastic material or an elastic connecting part is provided between the pressing head body and the mounting part.

[0015] Optionally, the elastic connecting member includes a connecting portion and an elastic portion, the connecting portion is passed through the mounting member and connected to the pressure head body, the elastic portion is sleeved on the connecting portion, one end of the elastic portion abuts against the mounting member, and the other end of the elastic portion abuts against the pressure head body.

[0016] An embodiment of the present application also provides a welding device, including the welding pressure head device described above.

[0017] The welding pressure head device and welding equipment provided in the embodiment of the present application have the following beneficial effects: the welding pressure head device of the embodiment of the present application presses the overlapped tabs on the soft-pack battery through the pressure head assembly, and then the welding device welds the tabs through the first welding hole and the second welding hole. In this way, gaps between the overlapped tabs can be prevented, thereby improving the welding quality;

[0018] Furthermore, by passing shielding gas into the first welding hole through the air duct, the shielding gas can be concentrated on the welding surface, thereby better preventing the welding surface from being oxidized during welding. At the same time, compared with the air duct being provided on the pressure head assembly, the air duct of the embodiment of the present application is provided on the bottom plate, which is more convenient for processing and does not reduce the strength of the pressure head assembly.

[0019] Since the welding equipment of the embodiment of the present application includes the above-mentioned welding pressure head device, it has the beneficial effects brought by the above-mentioned welding pressure head device, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 A schematic diagram of the three-dimensional structure of the welding pressure head device provided in an embodiment of the present application from one perspective;

[0022] Figure 2 A schematic diagram of the three-dimensional structure of the welding pressure head device provided in an embodiment of the present application from another perspective;

[0023] Figure 3 A front view of a welding pressure head device provided in an embodiment of the present application;

[0024] Figure 4 For the Figure 3 Cross-sectional structural diagram along line AA;

[0025] Figure 5 For the Figure 3 Cross-sectional structural diagram along line BB;

[0026] Figure 6 For the Figure 3 Cross-sectional structural diagram along the CC line.

[0027] Among them, the reference numerals in the figures are:

[0028] 1. Bottom plate; 11. First welding hole; 12. Airway; 13. Air inlet; 121. Main channel; 122. Branch channel; 1211. Exhaust slot; 1221. First branch channel; 1222. Second branch channel;

[0029] 2. Press head assembly; 21. Second welding hole; 22. Mounting member; 23. Press head body; 24. Elastic connecting member; 241. Connecting portion; 242. Elastic portion;

[0030] 3. Insulation connection assembly; 31. Insulation plate; 32. Insulation fixing piece; 321. Insulation sleeve; 322. Fixing part. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0032] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0035] See also Figures 1-6 , the welding pressure head device provided in the embodiment of the present application is now described. The welding pressure head device provided in the embodiment of the present application includes a base plate 1 and a pressure head assembly 2. The base plate 1 is provided with a first welding hole 11, and an air duct 12 is provided in the base plate 1. The air duct 12 is connected to the first welding hole 11. The base plate 1 is provided with an air inlet 13 and an air outlet connected to the air duct 12. The pressure head assembly 2 is installed on the base plate 1. The pressure head assembly 2 is used to press the workpiece to be welded. The pressure head assembly 2 is provided with a second welding hole 21. The second welding hole 21 is connected to the first welding hole 11 to allow the laser to pass through.

[0036] The workpiece to be welded in the embodiment of the present application may be a tab on a soft-pack battery, or may be a battery top cover or other workpiece that needs to be welded.

[0037] The ram assembly 2 may include a ram body 23 and a mounting member 22 . The ram body 23 is mounted on the base plate 1 through the mounting member 22 . A second welding hole 21 is connected between the ram body 23 and the mounting member 22 . The ram body 23 is used to abut against the workpiece to be welded.

[0038] The air passage 12 can be a straight passage or a curved arc passage. A shielding gas that prevents the workpiece from being oxidized during welding can be introduced into the air passage 12.

[0039] The welding pressure head device of the embodiment of the present application presses the workpiece to be welded through the pressure head assembly 2, and then the welding device welds the workpiece to be welded from the first welding hole 11 and the second welding hole 21. In this way, gaps can be prevented from appearing at the welding points of the workpiece to be welded, which may cause empty welds and improve the welding quality.

[0040] By passing the protective gas into the first welding hole 11 through the air duct 12, the protective gas can be gathered on the welding surface, which can better prevent the welding surface from being oxidized during welding. At the same time, compared with the air duct 12 being set on the pressure head assembly 2, the air duct 12 of the embodiment of the present application is set on the base plate 1, which is more convenient for processing and will not reduce the strength of the pressure head assembly 2.

[0041] In one embodiment, the air outlet is opposite to the second welding hole 21 .

[0042] The air channel 12 can extend from the bottom plate 1 toward the second welding hole 21 so that the air outlet is opposite to the second welding hole 21, so that the shielding gas can be closer to the welding surface of the workpiece to prevent the workpiece from oxidizing faster.

[0043] In one embodiment, the base plate 1 includes a main body and an extension portion. The extension portion is provided on a side of the main body facing the pressure head assembly 2 , and the air outlet is provided on the extension portion.

[0044] The gas passage 12 is disposed within the main body and extends toward the extension portion. The extension portion can extend into the second welding hole 21 of the ram assembly 2, thereby connecting the gas outlet on the extension portion with the second welding hole 21. This brings the gas outlet closer to the workpiece, allowing the shielding gas flowing from the gas outlet to reach the welding surface of the workpiece more quickly, thereby improving the workpiece's oxidation protection.

[0045] In one embodiment, see Figure 6 The air channel 12 includes a main channel 121 and several branch channels 122. The several branch channels 122 are connected to the air inlet 13. The main channel 121 is connected to the several branch channels 122. The length direction of the main channel 121 is parallel to the length direction of the pressure head assembly 2. The air outlet is opened on the side wall of the main channel 121 and is arranged along the length direction of the main channel 121.

[0046] The branch channel 122 can be an arc-shaped groove or a straight groove.

[0047] In the embodiment of the present application, the shielding gas flows from the gas inlet 13 into the branch channel 122 , then converges into the main channel 121 from the branch channel 122 , and finally flows into the second welding hole 21 from the gas outlet.

[0048] The shielding gas is gathered in the main channel 121 and then discharged from the gas outlet whose length direction is parallel to the length direction of the pressure head assembly 2. In this way, the shielding gas can be evenly distributed in the second welding hole 21, thereby improving the anti-oxidation effect.

[0049] In one embodiment, the branch channel 122 includes a first branch channel 1221 and a second branch channel 1222. The length direction of the first branch channel 1221 is perpendicular to the length direction of the second welding hole 21, and the length direction of the second branch channel 1222 is parallel to the length direction of the second welding hole 21. The first branch channel 1221 is connected to the air inlet 13, the first branch channel 1221 is connected to the second branch channel 1222, and the second branch channel 1222 is connected to the main channel 121.

[0050] The first branch channel 1221 and the second branch channel 1222 are both straight channels. The length direction of the first branch channel 1221 is perpendicular to the second welding hole 21, that is, the length direction of the first branch channel 1221 is parallel to the plane of the base plate 1 used to install the pressure head assembly 2. The position of the air inlet 13 can be processed according to production requirements along the length direction of the first branch channel 1221. Compared with the inclined groove, the position of the air inlet 13 of the first branch channel 1221 has more options. The position of the air inlet 13 can be adjusted to prevent spatial interference between the external ventilation device connected to the air inlet 13 and other devices. Moreover, compared with the arc groove, the first branch channel 1221 and the second branch channel 1222 are easier to process.

[0051] The first branch channel 1221 can be punched into the bottom plate 1 from a side wall of the bottom plate 1, and the second branch channel 1222 can be punched into the bottom plate 1 from the top surface of the bottom plate 1 close to the welding device. The length direction of the first branch channel 1221 is perpendicular to the length direction of the second branch channel 1222.

[0052] An end of the first branch channel 1221 away from the air outlet and an end of the second branch channel 1222 away from the air outlet are both provided with an air leakage prevention part, which can be a machine screw or a silicone plug.

[0053] In one embodiment, the width of the air outlet is smaller than the channel width of the channel 122 .

[0054] In this way, the flow rate of the shielding gas in the second welding hole 21 can be increased, thereby improving the anti-oxidation efficiency.

[0055] In one embodiment, the welding pressure head device is used in conjunction with the welding device, and the laser emitted by the welding device passes through the first welding hole 11 and the second welding hole 21 in sequence, and the air inlet 13 is arranged on the side of the base plate 1 away from the welding device or the side away from the first welding hole 11.

[0056] The side of the bottom plate 1 away from the welding device is the side of the bottom plate 1 used to connect to the pressure head assembly 2, and the side of the bottom plate 1 away from the first welding hole 11 is the side for drilling to process the first branch channel 1221.

[0057] The air inlet 13 connected to the air duct 12 is arranged on the side of the base plate 1 away from the welding device or the side away from the first welding hole 11, so that the external ventilation device connected to the air inlet 13 can be kept away from the welding device, preventing the external ventilation device from being burned by the laser, thereby extending the service life of the external ventilation device.

[0058] Preferably, the air inlet 13 is provided on a side of the base plate 1 facing away from the welding device.

[0059] Compared with the air inlet 13 being arranged on the side away from the first welding hole 11, the air inlet 13 is arranged on the side of the base plate 1 away from the welding device, which does not increase the overall width of the welding pressure head device and prevents the welding pressure head device from spatially interfering with other nearby devices when moving or using.

[0060] In one embodiment, see Figure 1 and Figure 4 The pressing head assembly 2 includes a plurality of pressing parts, and the plurality of pressing parts are arranged in parallel.

[0061] Multiple pressing parts arranged in parallel can press multiple workpieces for batch welding, further improving production efficiency.

[0062] In one embodiment, the pressing part includes a mounting part 22 and a pressing head body 23. The pressing head body 23 is connected to the mounting part 22. The mounting part 22 is installed on the base plate 1. The pressing head body 23 is made of elastic material or an elastic connecting part 24 is provided between the pressing head body 23 and the mounting part 22.

[0063] When the pressure head body 23 abuts against the workpiece to be welded, the elastic pressure head body 23 or the elastic connecting part 24 can be compressed. The elastic pressure head body 23 or the elastic connecting part 24 can fully press the workpiece to be welded, so that the welding points of the workpieces to be welded fit tightly, preventing the problem of cold welding.

[0064] The elastic connecting member 24 in the embodiment of the present application may be a spring or elastic silicone.

[0065] In one embodiment, the elastic connecting member 24 includes a connecting portion 241 and an elastic portion 242. The connecting portion 241 is passed through the mounting member 22 and connected to the pressure head body 23. The elastic portion 242 is sleeved on the connecting portion 241. One end of the elastic portion 242 abuts against the mounting member 22, and the other end of the elastic portion 242 abuts against the pressure head body 23.

[0066] The connecting portion 241 may be a screw or bolt, and the elastic portion 242 may be a spring or an elastic silicone sleeve sleeved on the connecting portion 241. The connecting portion 241 may guide the compression deformation of the elastic portion 242.

[0067] See also Figure 5In one embodiment, the welding pressure head device also includes an insulating connection component 3 and a moving component. The base plate 1 is connected to the moving component through the insulating connection component 3, and the moving component is used to drive the pressure head body 23 close to or away from the workpiece to be welded.

[0068] The moving assembly may include a horizontal moving member and a vertical moving member. The horizontal moving member is transmission-connected to the vertical moving member, and the base plate 1 is transmission-connected to the vertical moving member.

[0069] The horizontal moving part can be an electric cylinder, a pneumatic cylinder or a linear motor, and the vertical moving part can adopt the same structure as the horizontal moving part.

[0070] The insulating connection component 3 can prevent the workpiece to be welded from being connected to the moving component and causing a short circuit, thereby improving production safety.

[0071] The insulating connection component 3 may be an insulating film for connecting the base plate 1 and the moving component.

[0072] Preferably, the insulating connection assembly 3 includes an insulating plate 31 and an insulating fixing member 32. The insulating plate 31 is arranged between the base plate 1 and the movable assembly. A first connecting hole is provided on the insulating plate 31. The insulating fixing member 32 is passed through the first connecting hole and connected to the movable assembly.

[0073] The insulating plate 31 is provided with a third welding hole for passing the laser.

[0074] The insulating fixing member 32 can be a non-metallic screw or a non-metallic bolt. Connecting the base plate 1 and the mobile component through the insulating fixing member 32 is more stable and also safer.

[0075] Preferably, the insulating fixing member 32 includes an insulating sleeve 321 and a fixing portion 322. A second connecting hole is provided on the base plate 1. The insulating sleeve 321 is inserted into the first connecting hole and the second connecting hole. The fixing portion 322 is passed through the insulating sleeve 321 and connected to the movable component.

[0076] The fixing portion 322 can be a metal bolt or screw. Metal fixing portions 322 are stronger. The metal fixing portion 322 is separated from the base plate 1 by an insulating sleeve 321. This prevents the moving assembly from electrically connecting to the workpiece to be welded through the press head assembly 2, the base plate 1, and the fixing portion 322, thereby preventing a short circuit.

[0077] An embodiment of the present application also provides a welding device, including the above-mentioned welding pressure head device.

[0078] Since the welding equipment of the embodiment of the present application includes the welding pressure head device in any of the above embodiments, it has the beneficial effects brought by the welding pressure head device in any of the above embodiments, which will not be repeated here.

[0079] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A welding pressure head device, characterized in that, include: A bottom plate is provided with a first welding hole, an air passage is provided in the bottom plate, the air passage is communicated with the first welding hole, and an air inlet and an air outlet communicated with the air passage are opened on the bottom plate; The pressing head assembly is installed on the bottom plate and is used to press the workpiece to be welded. The pressing head assembly is provided with a second welding hole, which is connected to the first welding hole to transmit the laser.

2. The welding pressure head device according to claim 1, characterized in that: The air outlet is opposite to the second welding hole.

3. The welding pressure head device according to claim 1, characterized in that: The bottom plate includes a main body and an extension portion. The extension portion is provided on a side of the main body facing the pressure head assembly, and the air outlet is provided on the extension portion.

4. The welding pressure head device according to claim 1, characterized in that: The air channel includes a main channel and several branch channels, several of the branch channels are connected to the air inlet, the main channel is connected to several of the branch channels, the length direction of the main channel is parallel to the length direction of the pressure head assembly, and the air outlet is opened on the side wall of the main channel and is arranged along the length direction of the main channel.

5. The welding pressure head device according to claim 4, characterized in that: The branch channel includes a first branch channel and a second branch channel. The length direction of the first branch channel is perpendicular to the length direction of the second welding hole, and the length direction of the second branch channel is parallel to the length direction of the second welding hole. The first branch channel is connected to the air inlet, the first branch channel is connected to the second branch channel, and the second branch channel is connected to the main channel.

6. The welding pressure head device according to claim 4, characterized in that The width of the air outlet is smaller than the channel width of the branch channel.

7. The welding pressure head device according to claim 1, characterized in that: The welding pressure head device is used in conjunction with a welding device, and the laser emitted by the welding device passes through the first welding hole and the second welding hole in sequence. The air inlet is arranged on the side of the bottom plate away from the welding device or the side away from the first welding hole.

8. The welding pressure head device according to any one of claims 1 to 7, characterized in that: The pressing head assembly includes a plurality of pressing parts, and the plurality of pressing parts are arranged in parallel.

9. The welding pressure head device according to claim 8, characterized in that: The pressing part includes a mounting part and a pressing head body. The pressing head body is connected to the mounting part. The mounting part is installed on the base plate. The pressing head body is made of elastic material or an elastic connecting part is provided between the pressing head body and the mounting part.

10. The welding pressure head device according to claim 9, characterized in that: The elastic connecting member includes a connecting portion and an elastic portion. The connecting portion is passed through the mounting member and connected to the pressure head body. The elastic portion is sleeved on the connecting portion. One end of the elastic portion abuts against the mounting member, and the other end of the elastic portion abuts against the pressure head body.

11. A welding device, characterized in that: The invention comprises the welding pressure head device according to any one of claims 1 to 10.

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