An electric vehicle liquid cooling plate laser welding workpiece positioning and clamping device

Abstract

A kind of electric vehicle liquid cooling plate laser welding workpiece positioning clamping device, including base assembly, liquid cooling plate positioning mechanism, lower layer flat plate suction mechanism, liquid cooling plate peripheral compression mechanism and liquid cooling plate assembly hole peripheral compression mechanism;The base assembly is equipped with reference plate, workpiece support assembly, side wall and bottom plate, liquid cooling plate positioning mechanism and lower layer flat plate suction mechanism are installed on reference plate;The liquid cooling plate positioning mechanism is provided with positioning pin and positioning pin telescopic cylinder, and the positioning pin is driven into corresponding lower layer flat plate assembly hole and upper layer flow channel plate assembly hole by positioning pin telescopic cylinder;The lower layer flat plate suction mechanism includes several groups of vacuum chuck units, and the lower layer flat plate is fixed by vacuum chuck suction;Liquid cooling plate peripheral compression mechanism and liquid cooling plate assembly hole peripheral compression mechanism are arranged at the peripheral position of bottom plate.The utility model guarantees the accurate positioning of workpiece, reduces production cost, reduces environmental pollution, and realizes the development goal of automobile light weight.

Description

Technical Field

[0001] This utility model relates to the field of new energy electric vehicle technology, specifically to a workpiece positioning and clamping device for laser welding of liquid-cooled plates in electric vehicles. Background Technology

[0002] Electric vehicle liquid cooling plates transfer heat generated by the battery to the coolant through the circulation of coolant in internal channels. Utilizing the coolant's high specific heat capacity and thermal conductivity, the heat is quickly absorbed and carried away, thereby reducing the battery temperature. (See attached image) Figure 1 , Figure 2 As shown, an electric vehicle liquid cooling plate includes an upper flow channel plate 1 and a lower plate 2, which are welded together. The upper flow channel plate 1 is formed with a meandering and through groove 1-1 by a stamping process. The lower plate 2 has coolant inlet and outlet nozzles 2-1 at both ends. After the upper flow channel plate 1 and the lower plate 2 are welded, the bottom surface of the groove 1-1 of the upper flow channel plate 1 is closed by the lower plate 2 to form a coolant flow channel. The coolant inlet and outlet nozzles 2-1 of the lower plate 2 are connected to the two ends of the coolant flow channel. In order to ensure the fixed assembly of the liquid cooling plate with the battery module, two rows of upper flow channel plate assembly holes 1-2 and lower plate assembly holes 2-2 are respectively provided in the middle part of the upper flow channel plate 1 and the lower plate 2. After the upper flow channel plate 1 and the lower plate 2 are welded, the two rows of upper flow channel plate assembly holes 1-2 and lower plate assembly holes 2-2 overlap to form a liquid cooling plate assembly hole with a peripheral sealing structure.

[0003] With the continuous development of new energy vehicle technology, laser welding, with its advantages of fast welding speed, high connection strength, and small welding deformation, has been applied to the welding process of liquid cooling plates in new energy electric vehicles. Comparing liquid cooling plate structures produced using brazing and laser welding processes, under the same strength conditions, the laser-welded liquid cooling plate is thinner, reducing raw material usage and better suited to the development concept of lightweight automobiles. Furthermore, because high-temperature brazing furnaces are energy-intensive and easily produce harmful gases such as hydrogen fluoride, direct emission into the atmosphere does not meet the standards of green manufacturing and requires gas treatment. Laser welding does not have these problems. Therefore, using laser-welded liquid cooling plates also has the advantages of low cost and less environmental pollution. (Regarding the attached...) Figure 1 , Figure 2 In order to achieve precise positioning of the upper flow channel plate 1 and the lower plate 2 during the laser welding process and ensure the overlap of the assembly holes 1-2 of the upper flow channel plate and the assembly holes 2-2 of the lower plate, the workpiece positioning and clamping device for laser welding of electric vehicle liquid cooling plates needs to be optimized. Utility Model Content

[0004] This utility model provides a workpiece positioning and clamping device for laser welding of liquid-cooled plates in electric vehicles. It aims to match the laser welding process of liquid-cooled plates and optimize the design of the workpiece positioning and clamping device to ensure accurate positioning of the workpiece, reduce production costs, reduce environmental pollution, and achieve the development goal of lightweighting of automobiles.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A positioning and clamping device for laser welding workpieces of liquid-cooled plates in electric vehicles includes a base assembly, a liquid-cooled plate positioning mechanism, a lower plate adsorption mechanism, a liquid-cooled plate peripheral pressing mechanism, and a liquid-cooled plate assembly hole peripheral pressing mechanism. The base assembly includes a reference plate, a workpiece support assembly, side panels, and a bottom plate. The bottom plate is placed on a horizontal plane, and the reference plate is located above the bottom plate. The reference plate and the bottom plate are connected by the side panels to form a cavity structure box. A liquid cooling plate positioning mechanism and a lower plate adsorption mechanism are installed on the reference plate. The liquid cooling plate positioning mechanism consists of two parts, which are respectively matched with a set of assembly holes in the front and rear rows of assembly holes of the liquid cooling plate. Each part is provided with a positioning pin and a positioning pin telescopic cylinder. The positioning pin telescopic cylinder is arranged in the housing of the base assembly. The positioning pin is driven by the positioning pin telescopic cylinder to pass through the corresponding lower plate assembly hole and upper flow channel plate assembly hole. The lower plate adsorption mechanism includes several sets of vacuum suction cup units, which adsorb and fix the lower plate by vacuum suction cups. The liquid cooling plate periphery pressing mechanism and the liquid cooling plate assembly hole periphery pressing mechanism are arranged around the base plate, wherein the liquid cooling plate assembly hole periphery pressing mechanism corresponds to the positions of the front and rear rows of liquid cooling plate assembly holes on the liquid cooling plate.

[0006] The above-mentioned electric vehicle liquid-cooled plate laser welding workpiece positioning and clamping device has two sets of liquid-cooled plate positioning mechanism clearance holes on the reference plate of the base assembly. The two sets of liquid-cooled plate positioning mechanism clearance holes are respectively matched with two parts of the liquid-cooled plate positioning mechanism.

[0007] The above-mentioned electric vehicle liquid-cooled plate laser welding workpiece positioning and clamping device, the workpiece support component of the base assembly consists of a first workpiece support seat and a support frame with the same shape as the periphery of the liquid-cooled plate workpiece. The first workpiece support seat corresponds to the position of the liquid-cooled plate assembly hole on the liquid-cooled plate workpiece, except for the liquid-cooled plate assembly hole through which the positioning pin passes.

[0008] The above-mentioned laser welding workpiece positioning and clamping device for electric vehicle liquid-cooled plates includes a second workpiece support seat and a positioning pin telescopic cylinder mounting seat in each part of the liquid-cooled plate positioning mechanism. The positioning pin telescopic cylinder and the second workpiece support seat are fixedly assembled with the reference plate through the positioning pin telescopic cylinder mounting seat. The second workpiece support seat passes through the clearance hole of the liquid-cooled plate positioning mechanism on the reference plate and exits from the housing of the base assembly. The positioning pin telescopic cylinder is arranged vertically, and its telescopic rod extends upward, with a positioning pin fixedly connected to the top of the telescopic rod.

[0009] In the aforementioned laser welding workpiece positioning and clamping device for liquid-cooled plates in electric vehicles, the vacuum suction cup unit of the lower plate adsorption mechanism is arranged to avoid the first workpiece support seat of the workpiece support assembly. A third workpiece support seat and a vacuum plug are also provided in the vacuum suction cup unit. The third workpiece support seat is installed on the reference plate of the base assembly, and a vacuum suction cup is embedded in the third workpiece support seat. The vacuum plug is arranged at the edge of the third workpiece support seat and is connected to the vacuum suction cup and a separately provided vacuum device through a pipeline.

[0010] In the above-mentioned laser welding workpiece positioning and clamping device for electric vehicle liquid-cooled plates, the upper surfaces of the first workpiece support, the second workpiece support, the third workpiece support, and the support frame are located on the same horizontal plane.

[0011] The above-mentioned laser welding workpiece positioning and clamping device for electric vehicle liquid-cooled plates includes a liquid-cooled plate peripheral clamping mechanism comprising several sets of first clamping units. Each first clamping unit is equipped with a downward clamping clamp and a first tilting cylinder. The downward clamping clamp is driven by the first tilting cylinder, and a first clamping block is provided at the clamping head of the downward clamping clamp.

[0012] The above-mentioned laser welding workpiece positioning and clamping device for electric vehicle liquid-cooled plates includes a liquid-cooled plate assembly hole perimeter clamping mechanism comprising four sets of second clamping units arranged on the left and right. Each second clamping unit is equipped with a long-arm clamping clamp and a second tilting cylinder. The long-arm clamping clamp is driven by the second tilting cylinder. A second clamping block is provided on the long arm of the long-arm clamping clamp, and a liquid-cooled plate assembly hole clearance groove is provided on the second clamping block.

[0013] The aforementioned electric vehicle liquid-cooled plate laser welding workpiece positioning and clamping device is also equipped with an electrical control box, which is located at one end of the base plate of the base assembly. The electrical control box controls the operation of the liquid-cooled plate positioning mechanism, the lower plate adsorption mechanism, the liquid-cooled plate peripheral pressing mechanism, and the liquid-cooled plate assembly hole peripheral pressing mechanism.

[0014] This utility model provides a workpiece positioning and clamping device for laser welding of liquid-cooled plates in electric vehicles. It uses a liquid-cooled plate positioning mechanism to cooperate with the upper flow channel plate assembly hole and the lower plate assembly hole to accurately position the upper flow channel plate and the lower plate of the liquid-cooled plate. This ensures that the coolant inlet and outlet nozzles of the lower plate are connected to the front and rear ends of the coolant flow channel formed between the upper flow channel plate and the lower plate. Because the positioning pin telescopic cylinder of the liquid-cooled plate positioning mechanism is arranged in the housing of the base assembly, it avoids the positioning pin telescopic cylinder from obstructing the weld seam when welding around the liquid-cooled plate assembly hole. This invention is compatible with laser welding processes. First, the inlet and outlet nozzles of the liquid cooling plate are welded to the lower plate. Then, welding is performed around the assembly holes of the liquid cooling plate. During this process, the lower plate adsorption mechanism adsorbs the lower plate through vacuum negative pressure. With the support of the upper end face of the first workpiece support, second workpiece support, third workpiece support, and support frame located on the same horizontal plane, the flatness of the lower plate is ensured. At the same time, the liquid cooling plate perimeter pressing mechanism and the liquid cooling plate assembly hole perimeter pressing mechanism are arranged around the base plate of the base assembly to press and fix the upper flow channel plate of the liquid cooling plate to the perimeter of the lower plate and the outer perimeter of the weld seam of the liquid cooling plate assembly hole, ensuring the smooth progress of the laser welding process. Then, the second tilting cylinder in the liquid cooling plate assembly hole perimeter pressing mechanism drives the long-arm clamping clamp to open, avoiding the weld seam area around the liquid cooling plate, and welding is performed on the perimeter of the upper flow channel plate and the lower plate. After welding the upper flow channel plate and the lower plate around the periphery of the liquid cooling plate and the assembly holes of the liquid cooling plate, a cavity is formed between the upper flow channel plate and the lower plate, with only the coolant inlet and outlet nozzles communicating with the outside. At this point, a vacuum device can be used to evacuate the liquid cooling plate cavity through the coolant inlet and outlet nozzles, ensuring a tight fit between the non-groove area of ​​the upper flow channel plate and the lower plate. This guarantees the reliability of the subsequent welding process in the non-cooled flow channel area of ​​the liquid cooling plate and improves welding efficiency. In summary, this utility model, through the optimized design of the workpiece positioning and clamping device for laser welding of liquid cooling plates in electric vehicles, ensures accurate workpiece positioning, reduces production costs, reduces environmental pollution, and achieves the development goal of lightweight automobiles. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the upper flow channel plate structure of the liquid cooling plate in an electric vehicle. Figure 2 This is a schematic diagram of the lower flat plate structure of the liquid cooling plate in an electric vehicle. Figure 3 This is a schematic diagram of the overall structure of this utility model; Figure 4 This is a schematic diagram of the base assembly structure and the electrical control box assembly; Figure 5 This is a structural diagram of a part of the liquid cooling plate positioning mechanism; Figure 6This is a schematic diagram of the first clamping unit in the liquid cooling plate peripheral clamping mechanism; Figure 7 This is a schematic diagram of the second clamping unit in the clamping mechanism around the assembly hole of the liquid cooling plate; Figure 8 This is a schematic diagram of the vacuum suction cup unit structure in the lower plate adsorption mechanism; Figure 9 This is a schematic diagram of the working state of this utility model during welding operations around the assembly holes of the liquid cooling plate; Figure 10 This is a schematic diagram of the working state of this utility model during welding operations around the liquid cooling plate.

[0016] Explanation of each label in the diagram: 1 is the upper flow channel plate, 1-1 is the groove, and 1-2 is the upper flow channel plate assembly hole; 2 is the lower plate, 2-1 is the coolant inlet / outlet nozzle, and 2-2 is the mounting hole for the lower plate; 3 is the base assembly, 3-1 is the reference plate, 3-1-1 is the liquid cooling plate positioning mechanism clearance hole, 3-2 is the workpiece support assembly, 3-2-1 is the support frame, 3-2-2 is the first workpiece support seat, 3-3 is the side plate, and 3-4 is the bottom plate. 4 is the liquid cooling plate positioning mechanism, 4-1 is the positioning pin, 4-2 is the second workpiece support, 4-3 is the positioning pin telescopic cylinder, and 4-4 is the positioning pin telescopic cylinder assembly seat. 5 is the liquid cooling plate periphery clamping mechanism, 5-1 is the downward clamping clamp, 5-2 is the first tilting cylinder, and 5-3 is the first clamping block; 6 is the clamping mechanism around the liquid cooling plate assembly hole, 6-1 is the long-arm clamping clamp, 6-2 is the second tilting cylinder, 6-3 is the second clamping block, and 6-3-1 is the clearance groove for the liquid cooling plate assembly hole. 7 is the lower plate adsorption mechanism, 7-1 is the vacuum suction cup, 7-2 is the third workpiece support, and 7-3 is the vacuum plug. 8 represents the electrical control box. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] See Figure 1. Figure 2A liquid cooling plate for electric vehicles includes an upper flow channel plate 1 and a lower plate 2, which are welded together. The upper flow channel plate 1 is formed with a meandering, through-flow groove 1-1 by a stamping process. The lower plate 2 has coolant inlet / outlet nozzles 2-1 at both ends. After welding, the bottom surface of the groove 1-1 of the upper flow channel plate 1 is closed by the lower plate 2 to form a coolant flow channel. The coolant inlet / outlet nozzles 2-1 of the lower plate 2 are connected to both ends of the coolant flow channel. To ensure the fixed assembly of the liquid cooling plate and the battery module, two rows of upper flow channel plate assembly holes 1-2 and lower plate assembly holes 2-2 are respectively provided in the middle part of the upper flow channel plate 1 and the lower plate 2. In each row, the upper flow channel plate assembly holes 1-2 and the lower plate assembly holes 2-2 are positioned opposite each other, and there are four sets of them. After the upper flow channel plate 1 and the lower plate 2 are welded, the two rows of upper flow channel plate assembly holes 1-2 and lower plate assembly holes 2-2 overlap and form liquid cooling plate assembly holes for the peripheral sealing structure.

[0019] See Figure 1 , Figure 2 , Figure 3 Regarding the attached Figure 1 , Figure 2 The upper and lower flow channel plates 1 and 2 are made of aluminum alloy, preferably AL5083 aluminum-magnesium alloy. The upper flow channel plate is 0.8mm thick, and the lower plate 2 is 1mm thick. The upper flow channel plate 1 and lower plate 2 can be welded together using laser welding. To achieve precise positioning of the upper flow channel plate 1 and lower plate 2 during laser welding and ensure the overlap of the upper flow channel plate mounting holes 1-2 and the lower plate mounting holes 2-2, this invention provides a laser welding workpiece positioning and clamping device for electric vehicle liquid-cooled plates. It includes a base assembly 3, a liquid-cooled plate positioning mechanism 4, a lower plate adsorption mechanism 7, a liquid-cooled plate peripheral pressing mechanism 5, a liquid-cooled plate mounting hole peripheral pressing mechanism 6, and an electrical control box 8. The specific structure of each part is described in detail below: See Figure 3 , Figure 4The electric vehicle liquid-cooled plate laser welding workpiece positioning and clamping device of this utility model has a base assembly 3 with a reference plate 3-1, a workpiece support assembly 3-2, a side plate 3-3, and a bottom plate 3-4. The bottom plate 3-4 is placed on a horizontal plane, and the reference plate 3-1 is located above the bottom plate 3-4. The reference plate 3-1 and the bottom plate 3-4 are connected by the side plate 3-3 to form a cavity structure box, and ventilation and weight reduction holes are provided on the side plate 3-3. Two sets of liquid-cooled plate positioning mechanism clearance holes 3-1-1 are provided on the reference plate 3-1, and the two sets of liquid-cooled plate positioning mechanism clearance holes 3-1-1 are respectively matched with two parts of the liquid-cooled plate positioning mechanism. The workpiece support assembly 3-2 consists of a first workpiece support seat 3-2-2 and a support frame 3-2-1 with the same shape as the periphery of the liquid-cooled plate workpiece. The first workpiece support seat 3-2-2 corresponds to the position of the liquid-cooled plate assembly holes on the liquid-cooled plate workpiece, except for the liquid-cooled plate assembly holes through which the positioning pins pass.

[0020] See Figure 3 , Figure 5 The electric vehicle liquid-cooled plate laser welding workpiece positioning and clamping device of this utility model has a liquid-cooled plate positioning mechanism 4 consisting of two parts, which are respectively matched with a set of assembly holes in the front and rear rows of assembly holes of the liquid-cooled plate. Each part is provided with a positioning pin 4-1, a positioning pin telescopic cylinder 4-3, a second workpiece support seat 4-2, and a positioning pin telescopic cylinder mounting seat 4-4. The positioning pin telescopic cylinder 4-3 is arranged in the box of the base assembly 3. The positioning pin telescopic cylinder 4-3 and the second workpiece support seat 4-2 are fixedly assembled with the reference plate 3-1 through the positioning pin telescopic cylinder mounting seat 4-4. The second workpiece support seat 4-2 passes through the liquid-cooled plate positioning mechanism avoidance hole 3-1-1 on the reference plate 3-1 and exits from the box of the hollow structure of the base assembly 3. The positioning pin telescopic cylinder 4-3 is arranged vertically, and its telescopic rod extends upward. The positioning pin 4-1 is fixedly connected to the top of the telescopic rod. The positioning pin 4-1 is driven by the positioning pin telescopic cylinder 4-3 to pass into the corresponding liquid-cooled plate assembly hole.

[0021] See Figure 3 , Figure 6 The electric vehicle liquid-cooled plate laser welding workpiece positioning and clamping device of the present invention includes a liquid-cooled plate peripheral pressing mechanism 5 comprising several sets of first pressing units. Each set of first pressing units is provided with a downward pressing clamp 5-1 and a first tilting cylinder 5-2. The downward pressing clamp 5-1 is driven by the first tilting cylinder 5-2. A first pressing block 5-3 is provided at the pressing head of the downward pressing clamp 5-1. The upper flow channel plate 1 and the lower plate 2 are pressed and fixed by the first pressing block 5-3.

[0022] See Figure 3 , Figure 7The electric vehicle liquid-cooled plate laser welding workpiece positioning and clamping device of this utility model includes a liquid-cooled plate assembly hole perimeter pressing mechanism 6 comprising four sets of second pressing units arranged left and right. Each set of second pressing units is provided with a long-arm pressing clamp 6-1 and a second tilting cylinder 6-2. The long-arm pressing clamp 6-1 is driven by the second tilting cylinder 6-2. Two sets of second pressing blocks 6-3 are provided on the long arm of the long-arm pressing clamp 6-1. The second pressing blocks 6-3 are provided with liquid-cooled plate assembly hole avoidance grooves 6-3-1. The upper flow channel plate assembly hole 1-2 and the lower plate assembly hole 2-2 are pressed and fixed by the second pressing blocks 6-3. The liquid-cooled plate assembly hole avoidance grooves 6-3-1 of the second pressing blocks 6-3 avoid the weld seam around the liquid-cooled plate assembly hole.

[0023] See Figure 3 , Figure 7 The electric vehicle liquid-cooled plate laser welding workpiece positioning and clamping device of this utility model has a lower plate adsorption mechanism 7 comprising several sets of vacuum suction cup units. The vacuum suction cup units are arranged to avoid the first workpiece support seat 3-2-2 of the workpiece support assembly 3-2. Each set of vacuum suction cup units is provided with a vacuum suction cup 7-1, a third workpiece support seat 7-2, and a vacuum plug 7-3. The third workpiece support seat 7-2 is installed on the reference plate 3-1 of the base assembly 3, and the vacuum suction cup 7-1 is embedded in the third workpiece support seat 7-2 to adsorb and fix the lower plate 2. The vacuum plug 7-3 is arranged at the edge of the third workpiece support seat 7-2 and is connected to the vacuum suction cup 7-1 and a separately provided vacuum device through a pipeline.

[0024] See Figures 1 to 10The electric vehicle liquid cooling plate laser welding workpiece positioning and clamping device of this utility model can be matched with the laser welding process. First, the liquid cooling plate inlet and outlet nozzles 2-1 are welded to the lower plate 2. Then, the periphery of the liquid cooling plate assembly hole and the periphery of the liquid cooling plate are welded. Finally, the non-flow channel area of ​​the liquid cooling plate is welded. During the welding operation around the assembly holes of the liquid cooling plate, the lower plate adsorption mechanism 7 adsorbs the lower plate 2 through vacuum negative pressure. With the support of the upper end face of the first workpiece support seat 3-2-2, the second workpiece support seat 4-2, the third workpiece support seat 7-2 and the support frame 3-2-1 located on the same horizontal plane, the flatness of the lower plate 2 is ensured. At the same time, the liquid cooling plate perimeter pressing mechanism 5 and the liquid cooling plate assembly hole perimeter pressing mechanism 6 are arranged around the bottom plate 3-4 of the base assembly 3, pressing and fixing the upper flow channel plate 1 of the liquid cooling plate to the perimeter of the lower plate 2 and the outer perimeter of the weld seam of the liquid cooling plate assembly hole, ensuring the smooth progress of the laser welding process. Then, the second tilting cylinder 6-2 in the liquid cooling plate assembly hole perimeter pressing mechanism 6 drives the long-arm pressing clamp 6-1 to move. The long-arm pressing clamp 6-1 opens, avoiding the weld seam area around the liquid cooling plate, and welds the perimeter of the upper flow channel plate 1 and the lower plate 2. After welding around the assembly holes and periphery of the liquid cooling plate, a cavity is formed between the upper flow channel plate 1 and the lower plate 2, with only the coolant inlet and outlet nozzles communicating with the outside. At this time, a vacuum pump can be used to vacuum the liquid cooling plate cavity through the coolant inlet and outlet nozzles 2-1 of the lower plate 2, so that the non-groove area of ​​the upper flow channel plate 1 is tightly fitted with the lower plate 2, thereby ensuring the reliability of the subsequent welding process of the non-cold flow channel area of ​​the liquid cooling plate and improving the welding efficiency.

Claims

1. A positioning and clamping device for laser welding workpieces of liquid-cooled plates in electric vehicles, characterized in that: It includes a base assembly (3), a liquid cooling plate positioning mechanism (4), a lower plate adsorption mechanism (7), a liquid cooling plate peripheral pressing mechanism (5), and a liquid cooling plate assembly hole peripheral pressing mechanism (6). The base assembly (3) is provided with a reference plate (3-1), a workpiece support assembly (3-2), a side panel (3-3), and a bottom plate (3-4). The bottom plate (3-4) is placed on a horizontal plane, and the reference plate (3-1) is located above the bottom plate (3-4). The reference plate (3-1) and the bottom plate (3-4) are connected by the side panel (3-3) to form a cavity structure box. A liquid cooling plate positioning mechanism (4) and a lower plate adsorption mechanism (7) are installed on the reference plate (3-1). The liquid cooling plate positioning mechanism (4) consists of two parts, which are respectively matched with a set of assembly holes in the front and rear rows of assembly holes of the liquid cooling plate. In each part, a positioning pin (4-1) and a positioning pin telescopic cylinder (4-3) are provided. The positioning pin telescopic cylinder (4-3) is arranged in the housing of the base assembly (3). The positioning pin (4-1) is driven by the positioning pin telescopic cylinder (4-3) to pass through the corresponding lower plate assembly hole (2-2) and upper flow channel plate assembly hole (1-2). The lower plate adsorption mechanism (7) includes several sets of vacuum suction cup units, which adsorb and fix the lower plate (2) through vacuum suction cups (7-1); The liquid cooling plate periphery pressing mechanism (5) and the liquid cooling plate assembly hole periphery pressing mechanism (6) are arranged around the base plate (3-4), wherein the liquid cooling plate assembly hole periphery pressing mechanism (6) corresponds to the positions of the front and rear rows of liquid cooling plate assembly holes on the liquid cooling plate.

2. The workpiece positioning and clamping device for laser welding of liquid-cooled plates in electric vehicles according to claim 1, characterized in that: Two sets of liquid cooling plate positioning mechanism clearance holes (3-1-1) are provided on the base plate (3-1) of the base assembly (3), and the two sets of liquid cooling plate positioning mechanism clearance holes (3-1-1) are respectively matched with the two parts of the liquid cooling plate positioning mechanism.

3. The workpiece positioning and clamping device for laser welding of liquid-cooled plates in electric vehicles according to claim 2, characterized in that: The workpiece support assembly (3-2) of the base assembly (3) consists of a first workpiece support seat (3-2-2) and a support frame (3-2-1) that is consistent with the periphery shape of the liquid cooling plate workpiece. The first workpiece support seat (3-2-2) corresponds to the position of the liquid cooling plate assembly hole on the liquid cooling plate workpiece, except for the liquid cooling plate assembly hole through which the positioning pin passes.

4. The workpiece positioning and clamping device for laser welding of liquid-cooled plates for electric vehicles according to claim 3, characterized in that: Each part of the liquid cooling plate positioning mechanism (4) is further provided with a second workpiece support seat (4-2) and a positioning pin telescopic cylinder mounting seat (4-4); the positioning pin telescopic cylinder (4-3) and the second workpiece support seat (4-2) are fixedly assembled with the reference plate (3-1) through the positioning pin telescopic cylinder mounting seat (4-4); the second workpiece support seat (4-2) passes through the liquid cooling plate positioning mechanism clearance hole (3-1-1) on the reference plate (3-1) through the housing of the base assembly (3); the positioning pin telescopic cylinder (4-3) is arranged vertically, its telescopic rod extends upward, and the positioning pin (4-1) is fixedly connected to the top of the telescopic rod.

5. The workpiece positioning and clamping device for laser welding of liquid-cooled plates for electric vehicles according to claim 4, characterized in that: The vacuum suction cup unit of the lower plate adsorption mechanism (7) is arranged to avoid the first workpiece support seat (3-2-2) of the workpiece support assembly (3-2). A third workpiece support seat (7-2) and a vacuum plug (7-3) are also provided in the vacuum suction cup unit. The third workpiece support seat (7-2) is installed on the reference plate (3-1) of the base assembly (3). The vacuum suction cup (7-1) is embedded in the third workpiece support seat (7-2). The vacuum plug (7-3) is arranged at the edge of the third workpiece support seat (7-2) and is connected to the vacuum suction cup (7-1) and the separately provided vacuum equipment through the pipeline.

6. The workpiece positioning and clamping device for laser welding of liquid-cooled plates in electric vehicles according to claim 5, characterized in that: The upper surfaces of the first workpiece support (3-2-2), the second workpiece support (4-2), the third workpiece support (7-2), and the support frame (3-2-1) are located on the same horizontal plane.

7. The workpiece positioning and clamping device for laser welding of liquid-cooled plates in electric vehicles according to claim 6, characterized in that: The liquid cooling plate peripheral pressing mechanism (5) includes several sets of first pressing units. Each set of first pressing units is provided with a pressing clamp (5-1) and a first tilting cylinder (5-2). The pressing clamp (5-1) is driven by the first tilting cylinder (5-2). A first pressing block (5-3) is provided at the pressing head of the pressing clamp (5-1).

8. The workpiece positioning and clamping device for laser welding of liquid-cooled plates in electric vehicles according to claim 6, characterized in that: The liquid cooling plate assembly hole perimeter clamping mechanism (6) includes four sets of second clamping units arranged on the left and right. Each set of second clamping units is provided with a long-arm clamping clamp (6-1) and a second tilting cylinder (6-2). The long-arm clamping clamp (6-1) is driven by the second tilting cylinder (6-2). A second clamping block (6-3) is provided on the long arm of the long-arm clamping clamp (6-1). A liquid cooling plate assembly hole clearance groove (6-3-1) is provided on the second clamping block (6-3).

9. The workpiece positioning and clamping device for laser welding of liquid-cooled plates in electric vehicles according to claim 7 or 8, characterized in that: An electrical control box (8) is also provided. The electrical control box (8) is arranged at one end of the base plate (3-4) of the base assembly (3). The electrical control box (8) controls the operation of the liquid cooling plate positioning mechanism (4), the lower plate adsorption mechanism (7), the liquid cooling plate periphery pressing mechanism (5), and the liquid cooling plate assembly hole periphery pressing mechanism (6).

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