Laser seal welding tool for runner plate

Abstract

The utility model relates to the technical field of welding tools, in particular to a laser seal welding tool for a runner plate, which comprises a bottom plate, a cover plate and a pressing plate, a bottom groove for placing the runner plate is arranged on the upper end face of the bottom plate, a runner for introducing cold water is arranged below the bottom groove, and a cushion block for supporting the middle of the runner plate is arranged in the bottom groove. A bottom groove is formed in the bottom plate, positioning columns matched with round holes in the two ends of the runner plate are arranged at the two ends of the bottom groove, the cover plate is installed at the upper end of the bottom plate, a receding hole corresponding to the runner plate is formed in the middle of the cover plate, the cover plate downwards presses the two ends of the runner plate, the pressing plate is pressed at the upper end of the runner plate, and the positioning columns are sleeved with the two ends of the pressing plate which are fixed through pressing nuts. According to the utility model, the problem of serious deformation of the runner plate in the welding process is solved, and the requirement that the deformation of the runner plate assembly after laser seal welding is less than 0.15 mm is met; and welding defects such as cracks and air holes after welding are avoided, and the quality requirements for the welding seam strength and the air tightness of the runner plate assembly are met.

Description

Technical Field

[0001] The utility model relates to the technical field of welding tooling, in particular to a laser sealing welding tooling for a flow channel plate. Background Art

[0002] The endurance and safety issues of new energy vehicles are directly related to the on-board power batteries. Lithium-ion batteries generate a lot of heat during operation. If the heat in the battery accumulates too much and the temperature is too high, it will seriously affect its performance and life, and even cause an explosion when the temperature exceeds 80°C. In addition, the energy utilization rate and battery life of the battery are also affected by the uneven temperature distribution inside the battery. Studies have shown that a temperature difference of more than 5°C inside the battery will cause a 10% power drop and a 25% capacity decay. Therefore, it is crucial to design an efficient and reliable battery cooling system to ensure that lithium-ion batteries work within the optimal temperature range and reduce the temperature unevenness inside the battery.

[0003] In summary, in order to keep new energy vehicles running under safe and stable working conditions, it is very necessary to use efficient liquid cooling to control the battery temperature within the appropriate working temperature range. At present, cold plate liquid cooling has gradually become the mainstream of liquid cooling due to its high cooling efficiency, strong safety, and long service life. The module used by the superposition of the flow channel plate assembly has become its main component structure.

[0004] The main method of producing flow channel plate components is brazing, which has a complex processing process, high assembly precision requirements, low production efficiency, many defects such as slag inclusions, pores, poor brazing seam formation, and instability.

[0005] At present, laser welding is a new technology. Compared with other welding methods, laser welding has the advantages of concentrated energy, small heat-affected zone, small welding deformation and residual stress, high production efficiency, and high degree of automation. When welding this flow channel plate component structure, it is necessary to ensure a certain depth and width of penetration, no leakage when the component is subjected to a pressure exceeding 2MPa, and the deformation after welding is no more than 0.15mm to meet the requirements of component matching installation. At present, the production of such workpieces has the following problems:

[0006] 1. During the laser welding process, the workpiece is easily deformed by heat. If the deformation exceeds a certain limit, it will affect the internal operation of the heat dissipation component, greatly increase the damage rate of the component, thereby reducing the service life and failing to meet the normal use requirements of the component.

[0007] 2. During the laser welding process, due to the rapid solidification of the weld, internal pores and weld embrittlement cracks are likely to occur, resulting in the weld strength and airtightness of the runner plate assembly cannot be guaranteed.

[0008] Therefore, there is an urgent need for a laser sealing and welding tool for a flow channel plate to solve the problems of the prior art. Utility Model Content

[0009] The utility model aims at the above-mentioned deficiencies in the prior art and provides a laser sealing and welding tool for a flow channel plate, which solves the serious deformation problem of the flow channel plate during the welding process and meets the requirement that the deformation of the flow channel plate assembly after laser sealing and welding is less than 0.15mm; avoids the occurrence of welding defects such as cracks and pores after welding, and ensures the quality requirements of weld strength and air tightness of the flow channel plate assembly.

[0010] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0011] A laser sealing and welding tool for a flow channel plate comprises a base plate, a cover plate and a pressure plate, wherein the upper end surface of the base plate is provided with a bottom groove for placing the flow channel plate, a flow channel for passing cold water is provided below the bottom groove, a pad for supporting the middle part of the flow channel plate is provided in the bottom groove, positioning columns for matching with circular holes at both ends of the flow channel plate are provided at both ends of the bottom groove, the cover plate is installed on the upper end of the base plate, a clearance hole corresponding to the flow channel plate is provided in the middle of the cover plate, the cover plate presses the two ends of the flow channel plate downward, the pressure plate is pressed on the upper end of the flow channel plate, and the two ends of the pressure plate are sleeved on the positioning columns and fixed by tightening nuts.

[0012] Preferably, the bottom plate includes an upper bottom plate and a lower bottom plate, the bottom trough is located at the upper end of the upper bottom plate, the upper end surface of the upper bottom plate and the lower end surface of the lower bottom plate are provided with matching flow channels, the flow channels are located below the bottom trough, sealing rings are arranged around the flow channels, and one end of the connection between the upper bottom plate and the lower bottom plate is provided with a water inlet and a water outlet connected to the flow channel.

[0013] Preferably, the upper end surface of the lower base plate is provided with a positioning hole, and the lower end surface of the upper base plate is provided with a positioning pin that cooperates with the positioning hole.

[0014] Preferably, a clearance groove is arranged on the outer side of the clearance hole, and a chamfer is arranged at the upper edge of the clearance hole.

[0015] Preferably, the lower end surface of the cover plate is provided with semicircular pressure rings at both ends of the downward pressure flow channel plate.

[0016] Preferably, the pressure plate is connected to a positioning ring that cooperates with the positioning column via a connecting plate.

[0017] Preferably, a copper sheet is attached to the lower end surface of the pressing plate.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model solves the serious deformation problem of the flow channel plate during the welding process, and meets the requirement that the deformation of the flow channel plate assembly after laser sealing is less than 0.15mm; through the tooling to restrain the deformation during the welding process and keep it warm, the generation of welding defects such as cracks and pores after welding is avoided, and the quality requirements of weld strength and air tightness of the flow channel plate assembly are guaranteed.

[0020] 2. The utility model can position the flow channel plate assembly, eliminating the manual alignment steps, reducing labor intensity, and improving production efficiency.

[0021] 3. The utility model provides a clearance groove on the outside of the clearance hole to prevent the laser head guide copper nozzle from colliding with the tooling at the focus position. The upper edge of the clearance hole is chamfered to facilitate the airflow to converge at the weld position, making the fluidity of the protective airflow more uniform and the protection effect better. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the flow channel plate;

[0023] Figure 2 is a schematic diagram of the structure of the base plate;

[0024] Figure 3 is a top view of the upper base plate;

[0025] Figure 4 The structure of the cover plate Figure 1 ;

[0026] Figure 5 The structure of the cover plate Figure 2 ;

[0027] Figure 6 It is a structural schematic diagram of the pressing plate;

[0028] Figure 7 A top view of the utility model when in use;

[0029] In the figure: 1-flow channel plate; 101-weld; 102-circular hole; 2-upper bottom plate; 201-bottom groove; 202-positioning column; 203-tightening nut; 3-lower bottom plate; 4-water inlet; 5-pad; 6-cover plate; 601-gap groove; 602-chamfer; 603-gap hole; 604-pressing ring; 7-pressing plate; 701-connecting plate; 702-positioning ring; 8-water outlet. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0031] by Figure 1 For example, the groove on the upper edge of the runner plate 1 part is the welding path (weld 101). When designing the tooling, the space above the welding path needs to be free of obstructions, and the space is used for laser sealing. The workpiece is required to have a deformation of no more than 0.15mm, and there is no leakage in the weld 101 when the pressure is 2.0MPa.

[0032] A laser sealing and welding tool for a flow channel plate 1, comprising a bottom plate, a cover plate 6 and a pressing plate 7, such as Figure 3 As shown, the upper end surface of the bottom plate is provided with a bottom groove 201 for placing the flow channel plate 1, the flow channel plate 1 is placed in the bottom groove 201, the upper edge of the flow channel plate 1 is pressed by the cover plate 6, and the upper end of the flow channel plate 1 is pressed by the pressing plate 7. The material used for the bottom plate, the cover plate 6 and the pressing plate 7 is a corrosion-resistant stress-relief plate. The raw materials that have been aging treated or heat treated can eliminate residual stress well and can better meet the processing and use requirements.

[0033] like Figure 2 The bottom plate includes an upper bottom plate 2 and a lower bottom plate 3. The bottom groove 201 is located at the upper end of the upper bottom plate 2. The upper end surface of the upper bottom plate 2 and the lower end surface of the lower bottom plate 3 are provided with matching flow channels. The combined flow channel has a diameter of 4 mm. The flow channel is located below the bottom groove 201. A sealing ring is arranged around the flow channel. One end of the connection between the upper bottom plate 2 and the lower bottom plate 3 is provided with a water inlet 4 and a water outlet 8 connected to the flow channel, which can be connected to the water inlet and return water of the chiller to maintain a constant temperature in the bottom groove 201. The design of the flow channel is similar to that of the injection mold. The upper end surface of the lower bottom plate 3 is provided with a positioning hole, and the lower end surface of the upper bottom plate 2 is provided with a positioning pin that matches the positioning hole. The upper bottom plate 2 and the lower bottom plate 3 are fixed by bolt connection.

[0034] A pad 5 is provided in the bottom groove 201 to support the middle of the flow channel plate 1. The pad 5 is 0.6 mm high and is mainly used to control the reverse deformation during the welding process of the flow channel plate 1 assembly. Positioning posts 202 are provided at both ends of the bottom groove 201 to match the circular holes 102 at both ends of the flow channel plate 1, which play a role in positioning and deformation control, ensuring that the eccentricity of the product is qualified and consistent, eliminating the manual alignment step, and reducing the labor intensity.

[0035] The cover plate 6 is installed at the upper end of the base plate, and a clearance hole 603 corresponding to the flow channel plate 1 is provided in the middle of the cover plate 6. The cover plate 6 presses the two ends of the flow channel plate 1 downward, and the pressure plate 7 is pressed on the upper end of the flow channel plate 1. The two ends of the pressure plate 7 are sleeved on the positioning column 202 and fixed by the clamping nut 203.

[0036] like Figure 4 As shown, a 12mm wide and 8mm deep easing groove 601 is set on the outside of the easing hole 603, and a 5mm chamfer 602 is set at the upper edge of the easing hole 603. On the one hand, it prevents the laser head guide copper nozzle from colliding with the tooling at the focus position, and on the other hand, it prevents the right-angle prism from affecting the flow rate and area of ​​the shielding gas flow coming out of the guide copper nozzle, and facilitates the airflow to converge at the weld 101 position.

[0037] like Figure 5 As shown, the lower end surface of the cover plate 6 is provided with a semicircular pressure ring 604 for pressing down the two ends of the flow channel plate 1, which can press down the two ends of the flow channel plate 1 to form a reverse force with the force of deformation of the flow channel plate 1 during welding (the two ends of the flow channel plate 1 are warped upward), thereby ensuring that the deformation amount and precision requirements of the flow channel plate 1 assembly during laser sealing and welding can meet the requirements.

[0038] like Figure 6 As shown, the pressing plate 7 is connected to a positioning ring 702 that cooperates with the positioning column 202 through a connecting plate 701 .

[0039] The lower end surface of the pressure plate 7 is affixed with a copper sheet, which prevents the S-shaped flow channel in the center area of ​​the flow channel plate 1 assembly from being damaged by collision or deformation and extrusion. Because the pad 5 forms an upward force in the middle area, the pressure rings 604 at both ends control the reverse deformation of the downward force. The downward force is constrained by the bottom plate, while the upward force is not constrained. Therefore, the unconstrained deformation amount is not easy to control during the welding process, which can easily cause the center area to deform upward to form a deformation that exceeds the reverse deformation. In order to prevent this from happening, it is necessary to increase the pressure plate 7 to control the upward deformation amount of the center area of ​​the flow channel plate 1 assembly during laser sealing and play a constraining role.

[0040] like Figure 7As shown, when in use, first fix the tooling and place it on the welding workbench, and use bolts to lock and fix the lower base plate 3 from bottom to top through the through-hole position on the welding workbench. Then arrange the sealing ring of the lower base plate 3, and then match the positioning pin of the upper base plate 2 with the positioning hole of the lower base plate 3, and lock the upper base plate 2 and the lower base plate 3 with bolts, and then install 304 stainless steel quick-connect connectors at the water inlet 4 and the water outlet 8, and use water pipes to connect with the water cooler. Set the temperature of the water cooler to about 40-50°C, and observe that there is no water leakage in the middle of the base plate interlayer. It is normal. The water-passing effect provides a constant temperature insulation state for the sealing welding tooling fixture before and after welding. Ensure the insulation effect before, during and after welding, and eliminate abnormalities such as pores, internal brittle cracks and internal residual stress generated during the rapid solidification of the weld 101;

[0041] Place the pads 5 evenly in the middle area of ​​the bottom tank 201 along the circumferential direction, assemble the flow channel plate 1 parts as required and place them on the pads 5 in the bottom tank 201, the circular holes 102 at both ends of the flow channel plate 1 match with the positioning columns 202, and then cover the cover plate 6, which is matched with the bottom plate through bolts;

[0042] The pressing plate 7 is placed downward from the top of the flow channel plate 1 assembly and locked by the clamping nut 203. The pressing plate 7 and the cover plate 6 press the workpiece together.

[0043] After the runner plate 1 assembly is clamped by the tooling, teaching welding can be carried out. The chamfer 602 and the pressure plate 7 together form a "valley" area, which makes the fluidity of the shielding gas flow more uniform and the protection effect better. Among them, because the processing chamfer 602 avoids the right-angle position, it also plays a role in preventing the turbulence of the shielding gas airflow from affecting the molten pool state.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A laser sealing and welding tool for a flow channel plate, characterized in that: It includes a bottom plate, a cover plate and a pressure plate. The upper end surface of the bottom plate is provided with a bottom groove for placing the flow channel plate, and a flow channel for passing cold water is provided below the bottom groove. A pad for supporting the middle part of the flow channel plate is provided in the bottom groove, and positioning columns matching with the circular holes at the two ends of the flow channel plate are provided at both ends of the bottom groove. The cover plate is installed on the upper end of the bottom plate, and a clearance hole corresponding to the flow channel plate is provided in the middle of the cover plate. The cover plate presses the two ends of the flow channel plate downward, and the pressure plate is pressed on the upper end of the flow channel plate. The two ends of the pressure plate are sleeved on the positioning columns and fixed by tightening nuts.

2. The laser sealing and welding tool for a flow channel plate according to claim 1, characterized in that: The bottom plate includes an upper bottom plate and a lower bottom plate, the bottom groove is located at the upper end of the upper bottom plate, the upper end surface of the upper bottom plate and the lower end surface of the lower bottom plate are provided with matching flow channels, the flow channels are located below the bottom groove, sealing rings are arranged around the flow channels, and one end of the connection between the upper bottom plate and the lower bottom plate is provided with a water inlet and a water outlet connected to the flow channels.

3. The laser sealing and welding tool for a flow channel plate according to claim 2, characterized in that: The upper end surface of the lower base plate is provided with a positioning hole, and the lower end surface of the upper base plate is provided with a positioning pin matched with the positioning hole.

4. The laser sealing and welding tool for a flow channel plate according to claim 1, characterized in that: A clearance groove is arranged on the outer side of the clearance hole, and a chamfer is arranged on the upper edge of the clearance hole.

5. The laser sealing and welding tool for a flow channel plate according to claim 1, characterized in that: The lower end surface of the cover plate is provided with semicircular pressure rings for pressing down the two ends of the flow channel plate.

6. The laser sealing and welding tool for a flow channel plate according to claim 1, characterized in that: The pressure plate is connected with a positioning ring matched with the positioning column through a connecting plate.

7. The laser sealing and welding tool for a flow channel plate according to claim 1, characterized in that: The lower end surface of the pressing plate is pasted with a copper sheet.

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