Laser welding tool

Abstract

The utility model provides a laser welding tool which is structurally characterized in that on a supporting frame, a welding pressing head or a battery cell module right opposite to the upper end face of a pressing force digital display mechanism is suspended and driven by a lead screw module to move downwards in a linear mode till the welding pressing head presses the upper surface of the battery cell module or move upwards in a linear mode till the welding pressing head is separated from the battery cell module; in the welding process, welding smoke dust is sucked and removed through the dust removal mechanism, and the pressing force numerical value is detected and displayed in real time through the pressing force digital display mechanism. According to the utility model, the pressing force can be monitored in real time, and a basic guarantee is provided for a busbar welding process.

Description

Technical Field

[0001] The utility model relates to a tool, more specifically to a laser welding tool. Background Art

[0002] With the rapid development of new energy vehicles and the rapid development of the power battery market, the demand for battery module production lines has increased. Busbar welding is the core production process in the battery module production line. Its cross-sectional flow area, welding tensile strength, surface molten pool shape and other key welding quality parameters directly determine the performance of the battery module. The necessity of developing a Busbar welding system with stable performance is particularly prominent. Although the current laboratory welding tooling can realize laser welding, it cannot provide clamping force and protective gas flow, and lacks the setting and monitoring of dust removal wind speed. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes a laser welding tool, which can monitor the clamping force in real time and provide basic guarantee for the busbar welding process.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A laser welding tool, the structural features of which are:

[0006] On the support frame, the lead screw module is suspended and drives the welding pressure head or the battery module directly opposite to the upper end surface of the clamping force digital display mechanism to move linearly downward to the upper surface of the clamping battery module, or to move linearly upward to detach from the battery module. During the welding process, the dust removal mechanism removes the welding fume;

[0007] The clamping force digital display mechanism includes a lower plate, an upper plate, a pressure sensor, and a digital display. The upper plate and the lower plate are directly opposite to each other, and four pressure sensors are installed at the four corners between them. The upper plate is installed on the support frame through the lower plate. The upper end surface of the upper plate is flat and is used to place the battery module. A digital display is provided to display the clamping force value detected by the pressure sensor in real time.

[0008] The welding pressure head comprises a welding head support plate, a copper nozzle connecting piece, and a floating pressure head. The welding head support plate and the copper nozzle connecting piece are coaxially assembled one above the other through the floating pressure head, and a through light hole for laser to pass through is formed along the central axis. The copper nozzle connecting piece is formed with through air holes that are cross-distributed with the light hole for introducing protective gas. The welding head support plate is a fixed component, and the copper nozzle connecting piece is a floating component. The floating pressure head can float vertically relative to the welding head support plate. The lower end surface of the copper nozzle connecting piece is flat, serving as a contact surface with the upper surface of the battery cell module.

[0009] The dust removal mechanism includes a dust removal suction hood and a vertical suction channel that are connected to the inner cavity. The cavity serves as a dust removal duct. The suction port of the dust removal duct is located at the bottom end of the vertical suction channel, and the air outlet is located at the free end of the dust removal suction hood. The vertical suction channel is installed directly above the welding pressure head. A laser hole that is connected to the light through hole is provided according to the position and aperture of the light through hole, so that the laser can be injected into the light through hole. The suction port is opposite to the light through hole and is connected to the light through hole. The vertical suction channel is connected to the dust removal suction hood on the side, and is connected to the external negative pressure pipe through the air outlet.

[0010] The structural features of the utility model also lie in:

[0011] The screw module is manual and has a hand-cranked wheel.

[0012] The floating pressure heads are distributed in multiple groups at equal intervals around the central axis between the copper nozzle connecting piece and the welding head support plate. Each group of floating pressure heads includes a fixing nail and a spring. The fixing nail can be vertically displaced linearly through the welding head support plate. The lower end is threadedly screwed on the copper nozzle connecting piece, and the upper part is exposed above the welding head support plate and a space is left vertically between the welding head support plate. The spring is sleeved on the fixing nail and is vertically tensioned between the copper nozzle connecting piece and the welding head support plate.

[0013] The large end of the dust removal suction hood is a square opening and is connected to one side of the vertical suction channel. The small end is a round opening and is connected to the external negative pressure pipe through a flange. The wind direction in the hood is set horizontally from the large end to the small end, and the size gradually decreases from the large end to the small end.

[0014] The vertical air suction channel is a rectangular shell-shaped box structure, and the laser hole extends to the top to form a laser port.

[0015] The support frame is in an L-shaped structure, the clamping force digital display mechanism is installed on the bottom plate of the support frame, and the lead screw module is installed on the vertical arm of the support frame.

[0016] Compared with the prior art, the beneficial effects of the utility model are embodied in:

[0017] 1. Make the adjustment of the clamping force more reliable, more accurate, controllable and intuitive;

[0018] By setting up a clamping force digital display mechanism, the clamping force applied by the welding pressure head on the battery module can be detected in real time by using the pressure sensor, and the clamping force value can be displayed on the digital display. On this basis, the welding pressure head can be driven to move vertically by the lead screw module, so that the clamping force can be adjusted conveniently and accurately.

[0019] 2. Improved welding quality;

[0020] First, the copper nozzle connecting piece of the welding pressure head can float vertically through the floating pressure head, so that when the copper nozzle connecting piece presses the battery cell module, it can effectively solve the problem of uneven pressure caused by the unevenness of some welding surfaces, so that the force points of the welding surface are evenly distributed, achieving all-round compression and ensuring welding quality;

[0021] Second, since the dust removal hood of the dust removal mechanism is installed on the vertical suction channel in a side-connected manner, the laser beam is not blocked and there is no light blocking phenomenon, which further ensures the welding quality;

[0022] Third, the positions of the air holes for introducing the shielding gas and the dust removal duct are independent of each other, so that the shielding gas and the negative pressure dust removal can be separated. This can protect the plasma from being destroyed during welding and effectively ensure the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 It is a structural schematic diagram of the welding pressure head;

[0025] Figure 3 Schematic diagram of the cross-sectional structure of the welding pressure head;

[0026] Figure 4 It is a structural diagram of the dust removal mechanism;

[0027] Figure 5 It is a top view structural diagram of the clamping force digital display mechanism;

[0028] Figure 6 It is a schematic diagram of the position relationship between the lower plate and the pressure sensor.

[0029] In the figure:

[0030] 11 bottom plate; 12 vertical arm;

[0031] 2 screw modules; 21 hand cranks;

[0032] 3. Connecting seat;

[0033] 4 welding pressure head; 41 welding head support plate; 42 copper nozzle connecting piece; 43 light hole; 44 air hole; 451 fixing nail; 452 spring;

[0034] 5 clamping force digital display mechanism; 51 lower plate; 52 upper plate; 53 pressure sensor; 54 digital display;

[0035] 6 dust removal mechanism; 61 dust removal air suction hood; 62 air outlet; 63 vertical air suction channel; 64 laser hole. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Please refer to Figures 1 to 6 , the laser welding tooling structure of this embodiment is set as follows:

[0038] On the support frame, the lead screw module 2 is used to suspend and drive the welding pressure head 4 or the electric core module directly opposite to the upper end surface of the clamping force digital display mechanism 5 to move linearly downward to the upper surface of the clamping electric core module, or to move linearly upward to detach from the electric core module. During the welding process, the dust removal mechanism 6 is used to absorb the welding smoke;

[0039] The clamping force digital display mechanism 5 includes a lower plate 51, an upper plate 52, a pressure sensor 53, and a digital display 54. The upper plate 52 and the lower plate 51 are directly opposite to each other, and four pressure sensors 53 are installed at four corners between them. The upper plate 52 is installed on the support frame through the lower plate 51. The upper end surface of the upper plate 52 is flat and is used to place the battery module. A digital display 54 is provided to display the clamping force value detected by the pressure sensor 53 in real time.

[0040] The welding pressure head 4 includes a welding head support plate 41, a copper nozzle connecting piece 42, and a floating pressure head 45. The welding head support plate and the copper nozzle connecting piece 42 are coaxially assembled one above the other through the floating pressure head 45, and a through light hole 43 for laser passing is formed along the central axis between them. The copper nozzle connecting piece 42 is formed with through air holes 44 that are cross-distributed with the light hole 43 for introducing protective gas. The welding head support plate is a fixed component, and the copper nozzle connecting piece 42 is a floating component. It can float vertically relative to the welding head support plate through the floating pressure head 45. The lower end surface of the copper nozzle connecting piece 42 is flat, which serves as a contact surface with the upper surface of the battery module.

[0041] The dust removal mechanism 6 as a whole keeps moving with the welding pressure head 4, including a dust removal suction hood 61 and a vertical suction channel 63 communicated with the inner cavity. The cavity serves as a dust removal duct. The suction port of the dust removal duct is located at the bottom end of the vertical suction channel 63, and the air outlet 62 is located at the free end of the dust removal suction hood 61. The vertical suction channel 63 is installed directly above the welding pressure head 4. A laser hole 64 communicated with the light through hole 43 is provided according to the position and aperture of the light through hole 43 for laser injection into the light through hole. The suction port is opposite to the light through hole 43 and communicated with each other. The vertical suction channel 63 is connected to the dust removal suction hood 61 on the side, and is connected to the external negative pressure pipe through the air outlet 62.

[0042] In a specific implementation, the corresponding structural setting of the tooling also includes:

[0043] The screw module 2 is manual and has a hand wheel 21. The wheel axle of the hand wheel 21 is coaxially connected to the screw. The screw is driven to rotate forward or reverse by shaking the hand wheel 21. A connecting seat 3 is installed on the slider of the screw module 2. The welding pressure head 4 and the dust removal mechanism 6 are both installed on the connecting seat 3 and move vertically synchronously with the slider.

[0044] There are multiple groups of floating pressure heads 45 distributed at equal intervals around the central axis between the copper nozzle connecting piece 42 and the welding head support plate. Each group of floating pressure heads 45 includes a fixing nail 451 and a spring 452. The fixing nail 451 can be vertically displaced linearly through the welding head support plate, and the lower end is threadedly screwed on the copper nozzle connecting piece 42. The upper part is exposed above the welding head support plate and there is a space between the welding head support plate vertically. The spring 452 is sleeved on the fixing nail 451 and is vertically tensioned between the copper nozzle connecting piece 42 and the welding head support plate. The elastic force of the spring 452 is used to make the welding pressure head 4 press the battery cell module, which effectively improves the uneven pressure caused by the uneven welding surface.

[0045] The opening of the air hole 44 can be connected to an external protective gas pipe, and the hole diameter is set accordingly according to the required size of the protective gas flow.

[0046] The apertures of the light-through hole 43 and the laser hole 64 are set according to the welding area requirements.

[0047] The copper nozzle connecting piece 42 is detachable from the welding head support plate, and can be disassembled after unscrewing the fixing nail 451. The copper nozzle connecting piece 42 can be quickly disassembled and replaced according to the splash adhesion situation, and other materials can also be selected.

[0048] In this embodiment, four groups of floating pressure heads 45 are provided.

[0049] The large end of the dust suction hood 61 is a square opening and is connected to one side of the vertical suction channel 63. The small end is a round opening, which serves as an air outlet 62 and is connected to the external negative pressure pipe through a flange. The wind direction in the hood is set horizontally from the large end to the small end, and the size gradually decreases from the large end to the small end. The caliber of the air outlet 62 can be calculated in advance according to the design target. Since the dust suction hood 61 adopts a side-connected installation form on the vertical suction channel 63, it will not affect the laser from the laser port through the laser hole 64 into the light hole 43, and there will be no light blocking phenomenon.

[0050] The vertical air suction channel 63 is a rectangular shell-shaped box structure, and the laser hole 64 extends to the top to form a laser port.

[0051] The support frame is of an L-shaped structure, the clamping force digital display mechanism 5 is mounted on a bottom plate 11 of the support frame, and the lead screw module 2 is mounted on a vertical arm 12 of the support frame.

[0052] Working process:

[0053] Place the battery module on the upper end of the clamping force digital display mechanism 5, and use the hand-cranked wheel 21 to manually crank the lead screw module 2 to drive the welding pressure head 4 to move downward to the upper surface of the clamping battery module. The pressure sensor 53 detects the clamping force and displays the current clamping force value through the digital display 54. With the help of the pressure sensor 53 and the digital display 54, the clamping force can be accurately adjusted by rotating the lead screw;

[0054] Shielding gas can be introduced through the air hole 44 and blown toward the welding surface. During welding, welding fumes can be promptly sucked away by the dust removal mechanism 6. Since the air hole 44 and the dust removal air duct of the dust removal mechanism 6 are located independently, the technical goal of separating the shielding gas and the negative pressure dust removal can be achieved, and the protective plasma will not be destroyed during welding, thereby achieving good laser welding quality.

[0055] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A laser welding tool, characterized by: On the support frame, the lead screw module is suspended and drives the welding pressure head or the battery module directly opposite to the upper end surface of the clamping force digital display mechanism to move linearly downward to the upper surface of the clamping battery module, or to move linearly upward to detach from the battery module. During the welding process, the dust removal mechanism removes the welding fume; The clamping force digital display mechanism includes a lower plate, an upper plate, a pressure sensor, and a digital display. The upper plate and the lower plate are directly opposite to each other, and four pressure sensors are installed at the four corners between them. The upper plate is installed on the support frame through the lower plate. The upper end surface of the upper plate is flat and is used to place the battery module. A digital display is provided to display the clamping force value detected by the pressure sensor in real time. The welding pressure head as a whole keeps following the welding pressure head, including a welding head support plate, a copper nozzle connecting piece, and a floating pressure head. The welding head support plate and the copper nozzle connecting piece are coaxially assembled one above the other through the floating pressure head, and a through light hole for laser to pass through is formed along the central axis. The copper nozzle connecting piece is formed with through air holes that are cross-distributed with the light hole for introducing protective gas. The welding head support plate is a fixed component, and the copper nozzle connecting piece is a floating component. The floating pressure head can float vertically relative to the welding head support plate. The lower end surface of the copper nozzle connecting piece is flat, which serves as a contact surface with the upper surface of the battery cell module. The dust removal mechanism includes a dust removal suction hood and a vertical suction channel that are connected to the inner cavity. The cavity serves as a dust removal duct. The suction port of the dust removal duct is located at the bottom end of the vertical suction channel, and the air outlet is located at the free end of the dust removal suction hood. The vertical suction channel is installed directly above the welding pressure head. A laser hole that is connected to the light through hole is provided according to the position and aperture of the light through hole, so that the laser can be injected into the light through hole. The suction port is opposite to the light through hole and is connected to the light through hole. The vertical suction channel is connected to the dust removal suction hood on the side, and is connected to the external negative pressure pipe through the air outlet.

2. The laser welding tool according to claim 1 is characterized in that: The screw module is manual and has a hand-cranked wheel.

3. The laser welding tool according to claim 1 is characterized in that: The floating pressure heads are distributed in multiple groups at equal intervals around the central axis between the copper nozzle connecting piece and the welding head support plate. Each group of floating pressure heads includes a fixing nail and a spring. The fixing nail can be vertically displaced linearly through the welding head support plate. The lower end is threadedly screwed on the copper nozzle connecting piece, and the upper part is exposed above the welding head support plate and a space is left vertically between the welding head support plate. The spring is sleeved on the fixing nail and is vertically tensioned between the copper nozzle connecting piece and the welding head support plate.

4. The laser welding tool according to claim 1 is characterized in that: The large end of the dust removal suction hood is a square opening and is connected to one side of the vertical suction channel. The small end is a round opening and is connected to the external negative pressure pipe through a flange. The wind direction in the hood is set horizontally from the large end to the small end, and the size gradually decreases from the large end to the small end.

5. The laser welding tool according to claim 1 is characterized in that: The vertical air suction channel is a rectangular shell-shaped box structure, and the laser hole extends to the top to form a laser port.

6. The laser welding tool according to claim 1 is characterized in that: The support frame is in an L-shaped structure, the clamping force digital display mechanism is installed on the bottom plate of the support frame, and the lead screw module is installed on the vertical arm of the support frame.

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