CN118385747A - Laser flying welding device for lithium battery connecting sheet and use method - Google Patents

Abstract

The invention discloses a laser flying welding device for a lithium battery connecting sheet and a use method thereof, which relate to the technical field of laser welding and comprise two X-axis frames and a top mounting frame, wherein a lithium battery pack is arranged below the X-axis frames, a pole is arranged on the lithium battery pack, two Y-axis frames which are arranged in parallel are movably connected on the two X-axis frames, and the laser flying welding device further comprises: a displacement mechanism: the displacement mechanism consists of an X-axis displacement mechanism and a Y-axis displacement mechanism. The laser flying welding device for the lithium battery connecting sheet and the use method thereof effectively solve the efficiency bottleneck problem commonly existing in the traditional welding equipment while ensuring high-quality welding, and make the welding process substantially advanced by improving the flexibility and the response speed of the production line.

Description

Laser flying welding device and use method for lithium battery connecting piece

Technical Field

The present invention relates to the technical field of laser welding, and in particular to a laser flying welding device for lithium battery connecting pieces and a use method thereof.

Background technique

Laser flying welding is mainly used in the busbar welding process, a key link in the production line of new energy lithium battery modules and battery packs. This process is an important step to ensure the overall performance of the battery pack, including reliability, stability and safety. It is responsible for accurately welding the positive and negative poles of the orderly arranged single cells to the busbar to achieve a parallel and series relationship. In view of the influence of individual differences in the manufacturing process of the battery cells and the group assembly errors on the welding quality, from a process level, the welding fixture system must have the following core functions: dynamically adjust the clamping position of the welding fixture according to the spatial position difference of each pole; accurately control the height of the galvanometer to ensure that the set defocus amount is accurate; during the welding process, ensure that the busbar and the pole are tightly fitted and the clamping force is within the allowable range.

However, when using traditional laser flying welding devices, the widely used solution is to use a dual-area clamping fixture with a laser galvanometer welding system to perform welding operations on all battery cell poles through alternating movement. Although the alternating movement of the fixture improves the welding efficiency to a certain extent, it has obvious limitations and cannot significantly improve the operating efficiency, which is specifically reflected in the following aspects:

1. The laser galvanometer cannot perform welding tasks when switching between multiple welding areas, which reduces equipment efficiency and utilization;

2. It is impossible to independently and accurately control the clamping parameters of each pole and obtain the clamping force in real time. Due to consistency errors and fixture processing errors, the clamping force of each pole is uneven, which may cause the risk of cold welding;

3. It can only measure the center height of the area instead of the independent height of a single pole, which affects the real detection of the clamping effect and further increases the possibility of quality problems such as cold welding;

4. The plane coordinate position adjustment capability of the clamping fixture is limited and the flexibility is insufficient. When the position deviation of the battery cell pole is large, it may cause the welding track to deviate. In addition, since it cannot adapt to the changes in battery cell specifications, the fixture needs to be replaced when the product is changed;

5. The structure of this type of fixture also makes it unable to adapt to the requirements of flying welding and further improve welding efficiency.

Therefore, there is an urgent need for a new laser flying welding device and a method for using the lithium battery connecting piece to solve the above problems.

Summary of the invention

The present invention discloses a laser flying welding device and a use method for a lithium battery connecting piece, aiming to solve the problem that when a traditional laser flying welding device is used, a widely used solution is to use a double-zone clamping clamp in conjunction with a laser galvanometer welding system to perform welding operations on all battery cell poles through alternating movement. Although the alternating movement of the clamp improves the welding efficiency to a certain extent, it has obvious limitations and cannot significantly improve the technical problem of operating efficiency.

In order to achieve the above object, the present invention adopts the following technical solutions:

A laser flying welding device for lithium battery connecting pieces, comprising two X-axis frames and a top mounting frame, a lithium battery pack is arranged below the X-axis frames, a pole is arranged on the lithium battery pack, and two parallel Y-axis frames are movably connected to the two X-axis frames, characterized in that it also comprises: a displacement mechanism: the displacement mechanism is composed of an X-axis displacement mechanism and a Y-axis displacement mechanism, the X-axis displacement mechanism comprises an X-axis slide seat arranged on the X-axis frames, and the number of the X-axis slide seats on one X-axis frame is two, the two ends of the bottom outer walls of the two Y-axis frames are respectively connected to the top outer walls of the four X-axis slide seats, and the two X-axis frames are provided with X-axis motors, and the X-axis motors are used to drive the The X-axis slide moves; the Y-axis displacement mechanism includes a Y-axis slide arranged on the top of the two Y-axes, and the two Y-axis frames are provided with Y-axis motors, and the Y-axis motors are used to drive the Y-axis slide to move; the accompanying moving mechanism: the accompanying moving mechanism is arranged on the top mounting frame; the laser welding mechanism: the laser welding mechanism is connected to the accompanying moving mechanism, and the laser welding mechanism includes a laser welding head arranged on the accompanying moving mechanism, and the laser welding head faces directly downward; the clamping mechanism: the clamping mechanism is arranged on the Y-axis slide, and the clamping mechanism is used in conjunction with the Y-axis displacement mechanism; the fine-tuning mechanism: the fine-tuning mechanism is connected to the clamping mechanism.

In this solution, the Y-axis frame is connected to the X-axis by connecting the X-axis slide to maintain a sliding connection. When starting the machine to connect the poles on the lithium battery pack, it is necessary to first start the visual sensor (not shown in the figure) and use the visual sensor (not shown in the figure) to locate the reference point and establish a relative coordinate system. At the same time, the positioning information of the clamping mechanism is established by reading the coordinate data of all poles in the database and the compensation matching algorithm, and then the clamping mechanisms on the two Y-axis frames are moved close to the starting welding position of the lithium battery pack through the set displacement mechanism, and the set laser welding mechanism is connected to the accompanying moving mechanism. As the welding of the starting position of the lithium battery pack begins, the clamping mechanism is alternately clamped along the Y-axis frame in turn under the driving action of the Y-axis displacement mechanism. During this process, the laser welding head moves at a uniform speed along the top mounting frame to continuously weld the alternately clamped poles below it. Compared with the traditional laser welding process, there is no delayed switching between the welding process and the clamping process of this solution, which effectively improves the welding efficiency of the equipment.

In a preferred solution, a fixing frame is installed at the bottom of each of the two movable joints and one of the fixed joints, two side sliding seats are provided on one side outer wall of the fixing frame, a driving cylinder is installed on the bottom outer wall of the fixing frame, a piston rod is provided at the bottom of the driving cylinder, a movable frame is provided at the bottom end of the piston rod, a side sliding rail is provided on one side outer wall of the movable frame, the side sliding seat is slidably connected to the side sliding rail, an extension mounting platform is installed on the outer wall of one side of the movable frame close to the bottom, a clamping copper block is provided on one side of the bottom outer wall of the extension mounting platform, and the clamping copper block is arranged as a top hollow rectangular loop structure.

By driving the cylinder to press down, the movable frame on the fixed frame can be pressed down along the side slide rail, so that the pole can be pressed by the clamping copper block, and the top of the clamping copper block is a hollow rectangular loop structure, so that the laser welding head can pass through the clamping copper block to weld the bus (not shown in the figure) installed on the pole. Under the action of the displacement mechanism, the clamping mechanisms on both sides alternately clamp the poles and buses (not shown in the figure) on both sides of the lithium battery pack, so that the welding process is more orderly and stable, and the overall structure is more suitable for laser welding, which is conducive to improving efficiency.

In a preferred solution, a load sensor is provided at the connection between the piston rod and the movable frame, and a height sensor is provided on the outer wall of the fixed frame on a side away from the movable frame.

The load sensor and height sensor installed on the clamping mechanism can monitor and control the clamping force of a single pole in real time, and include a height detection structure to ensure the consistency and accuracy of the clamping height. This feature overcomes the problem that traditional clamps cannot achieve independent clamping and parameter monitoring of multiple poles, thereby significantly improving welding quality.

In a preferred embodiment, the fine-tuning mechanism includes a driving motor arranged on the top outer wall of the Y-axis slide, one end of the output shaft of the driving motor is connected to a rotating shaft, the rotating shaft is connected to the top outer wall of the fixed joint through a bearing, a rotating block is installed on the outer wall of the rotating shaft, and the top outer walls of the two movable joints are connected to connecting rods through bearings, and the opposite ends of the two connecting rods are respectively connected to the outer walls on both sides of the rotating block through bearings.

The clamping mechanism as a whole exists in the form of a pressure head group, which is composed of three single pressure heads, and the two single pressure heads located on both sides of the fixed joint are movably connected. When the driving motor drives the shaft to rotate, the connecting rods on both sides can be pushed apart or pulled together by the rotating block on the outer wall of the shaft, and the movable joint can move along the top slide rail. In this way, when welding lithium battery cells of different thicknesses, adaptive adjustment can be made through the fine-tuning mechanism. At the same time, when the installation error of some poles increases, the clamping copper block can be made to correspond to the pole position more accurately through fine-tuning, which effectively adapts to the changes in battery cell specifications and avoids the trouble of replacing the clamping mechanism.

The method for using the laser flying welding device for lithium battery connecting pieces also includes:

S1: Use the visual sensor to locate the reference point and establish a relative coordinate system; at the same time, the positioning information of the pole pressure head is established by reading the coordinate data of all poles in the database and using the compensation matching algorithm;

S2: Under the action of the displacement mechanism, the Y-axis frame equipped with the clamping mechanism moves to the top of the first row of lithium batteries, and the two clamping mechanisms located on the two Y-axis frames correspond to the poles on one side of the lithium battery respectively; the moving position is moved according to the algorithm result of the above-mentioned coordinate data, and its main moving parameters include: two X-axis coordinate data, two Y-axis coordinate data, and two clamping mechanism center distance data. With the cooperation of the above parameters, the clamping mechanism accurately clamps the corresponding position;

S3: Next, the clamping mechanism on one side is pressed down to the position, and for each pressing point, the clamping force and the clamping height data are collected, and the clamping state of each point is determined;

S4: At this point, the preparation work before welding has been completed, and the welding of the first row of lithium batteries begins; the welding process is that the laser welding head moves at a constant speed and performs flying welding under the drive of the accompanying moving mechanism, and its moving speed is: battery cell arrangement spacing / (2*single pole welding time), and its welding sequence is to alternately weld the left and right sides, and switch through a reasonable welding point sequence to ensure that all weld positions are within the coverage range of the laser welding system during welding;

S5: After welding is completed, the displacement mechanism, accompanying movement mechanism and clamping mechanism all move to their initial positions.

As can be seen from the above, the laser flight welding device for lithium battery connecting pieces includes two X-axis frames and a top mounting frame, a lithium battery pack is arranged below the X-axis frame, a pole is arranged on the lithium battery pack, and two parallel Y-axis frames are movably connected to the two X-axis frames, and also includes: a displacement mechanism: the displacement mechanism is composed of an X-axis displacement mechanism and a Y-axis displacement mechanism, the X-axis displacement mechanism includes an X-axis slide seat arranged on the X-axis frame, and the number of X-axis slide seats on one X-axis frame is two, the two ends of the bottom outer walls of the two Y-axis frames are respectively connected to the top outer walls of the four X-axis slide seats, and the two X-axis frames are provided with X-axis motors, and the X-axis motors are used to drive the X The Y-axis slide moves; the Y-axis displacement mechanism includes a Y-axis slide arranged on the top of the two Y-axis, and the two Y-axis frames are provided with a Y-axis motor, and the Y-axis motor is used to drive the Y-axis slide to move; the accompanying moving mechanism: the accompanying moving mechanism is arranged on the top mounting frame; the laser welding mechanism: the laser welding mechanism is connected to the accompanying moving mechanism, and the laser welding mechanism includes a laser welding head arranged on the accompanying moving mechanism, and the laser welding head faces directly downward; the clamping mechanism: the clamping mechanism is arranged on the Y-axis slide, and the clamping mechanism is used in conjunction with the Y-axis displacement mechanism; the fine-tuning mechanism: the fine-tuning mechanism is connected to the clamping mechanism. The laser flying welding device and the use method for lithium battery connecting pieces provided by the present invention effectively solve the efficiency bottleneck problem commonly existing in traditional welding equipment while ensuring high-quality welding, and make substantial progress in the welding process by improving the flexibility and response speed of the production line.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the overall structure of a laser flying welding device for lithium battery connecting pieces proposed in the present invention.

FIG. 2 is a schematic diagram of a top view of the displacement mechanism of the laser flying welding device for lithium battery connecting pieces proposed by the present invention.

FIG. 3 is a diagram showing the Y-axis slide installation structure of the laser flying welding device for lithium battery connecting pieces proposed by the present invention.

FIG. 4 is a schematic diagram of the pole pressing process of the laser flying welding device for lithium battery connecting pieces proposed by the present invention.

FIG. 5 is a side view of the clamping mechanism of the laser flying welding device for lithium battery connecting pieces proposed by the present invention.

FIG. 6 is a structural diagram of the enclosure installation of the laser flying welding device for lithium battery connecting pieces proposed by the present invention.

FIG. 7 is a schematic diagram of the gas supply pipeline installation structure of the laser flying welding device for lithium battery connecting pieces proposed by the present invention.

FIG8 is a schematic diagram of the installation structure of the mobile frame of the laser flying welding device for lithium battery connecting pieces proposed by the present invention.

FIG. 9 is a diagram showing the installation structure of an extended mounting platform of a laser flying welding device for lithium battery connecting pieces proposed by the present invention.

In the figure: 1. X-axis frame; 2. Y-axis frame; 3. Top mounting frame; 4. Top slide; 5. Laser welding head; 6. Lithium battery pack; 7. X-axis slide; 8. Y-axis slide; 9. Y-axis motor; 10. Exhaust pipe; 11. Clamping copper block; 12. Driving motor; 13. Connecting plate; 14. Height sensor; 15. Moving frame; 16. Pole; 17. Enclosure; 18. Air supply pipeline; 19. Fixed joint; 20. Movable joint; 22. Rotating block; 23. Rotating shaft; 24. Connecting rod; 25. Drainage channel; 26. Load sensor; 27. Side slide; 28. Driving cylinder; 29. Connecting slide; 30. Extension mounting table; 31. Fixed pipe; 32. Side slide rail; 33. Piston rod; 34. X-axis motor.

Detailed ways

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

The laser flying welding device and use method for lithium battery connecting plates disclosed in the present invention are mainly applied to traditional laser flying welding devices. When in use, a widely used solution is to use a dual-zone clamping clamp in conjunction with a laser galvanometer welding system to perform welding operations on all battery cell poles through alternating movement. Although the alternating movement of the clamp improves the welding efficiency to a certain extent, it has obvious limitations and cannot significantly improve the operating efficiency.

Referring to Figures 1, 2, 3, 4, 5 and 6, a laser flying welding device for lithium battery connecting pieces and a method of using the same include two X-axis frames 1 and a top mounting frame 3, a lithium battery pack 6 is provided below the X-axis frame 1, a pole 16 is provided on the lithium battery pack 6, two parallel Y-axis frames 2 are movably connected to the two X-axis frames 1, and also include: a displacement mechanism: the displacement mechanism is composed of an X-axis displacement mechanism and a Y-axis displacement mechanism, the X-axis displacement mechanism includes an X-axis slide 7 provided on the X-axis frame 1, and the number of X-axis slides 7 on one X-axis frame 1 is two, the two ends of the bottom outer walls of the two Y-axis frames 2 are respectively connected to the top outer walls of the four X-axis slides 7, and the two X-axis frames 1 are connected to the top outer walls of the four X-axis slides 7. Both are provided with an X-axis motor 34, which is used to drive the X-axis slide 7 to move; the Y-axis displacement mechanism includes a Y-axis slide 8 arranged at the top of the two Y-axes, and the two Y-axis frames 2 are provided with a Y-axis motor 9, which is used to drive the Y-axis slide 8 to move; accompanying moving mechanism: the accompanying moving mechanism is arranged on the top mounting frame 3; laser welding mechanism: the laser welding mechanism is connected to the accompanying moving mechanism, and the laser welding mechanism includes a laser welding head 5 arranged on the accompanying moving mechanism, and the laser welding head 5 faces directly downward; clamping mechanism: the clamping mechanism is arranged on the Y-axis slide 8, and the clamping mechanism is used in conjunction with the Y-axis displacement mechanism; fine-tuning mechanism: the fine-tuning mechanism is connected to the clamping mechanism.

In actual use, the Y-axis frame 2 is connected to the X-axis by connecting the X-axis slide 7 to maintain a sliding connection with the X-axis. When starting the machine to connect the pole 16 on the lithium battery pack 6, it is necessary to first start the visual sensor (not shown in the figure) and use the visual sensor (not shown in the figure) to locate the reference point and establish a relative coordinate system.

At the same time, the positioning information of the clamping mechanism is established by reading the coordinate data of all the poles 16 in the database and the compensation matching algorithm, and then the clamping mechanism on the two Y-axis frames 2 is moved close to the starting welding position of the lithium battery pack 6 through the set displacement mechanism, and the set laser welding mechanism is connected to the accompanying moving mechanism. As the welding of the starting position of the lithium battery pack 6 begins, the clamping mechanism is alternately clamped along the Y-axis frame 2 in turn under the driving action of the Y-axis displacement mechanism. During this process, the laser welding head 5 moves at a uniform speed along the top mounting frame 3 to continuously weld the alternately clamped poles 16 below it. Compared with the traditional laser welding process, the welding process and the clamping process of this scheme do not have a delayed switching, and the multi-position displacement mechanism adopted can flexibly and quickly move the clamping mechanism to the next area to be welded without interrupting the welding process, which greatly reduces the non-operating time of the equipment and improves the overall welding efficiency.

The accompanying moving mechanism includes a top slide 4 arranged on a top mounting frame 3, a laser welding head 5 is connected to the top slide 4, and the laser welding head 5 is located just above the clamping mechanism.

3, 4, 5, 6, 7 and 9, in a preferred embodiment, the clamping mechanism includes a connecting plate 13 arranged at the bottom of the Y-axis slide 8, a fixed joint 19 is installed at the central position of the bottom outer wall of the connecting plate 13, two top slide rails are also provided on the bottom outer wall of the connecting plate 13, and two movable joints 20 are installed on the two top slide rails, a connecting slide 29 is provided on the top outer wall of the movable joint 20, and the connecting slide 29 is slidably connected to the top slide rail, and the two movable joints 20 are respectively located on both sides of the fixed joint 19, and the two movable joints 20 and a fixed joint 19 are respectively provided. A fixed frame is installed at the bottom of the joint 19, and two side sliding seats 27 are provided on the outer wall of one side of the fixed frame. A driving cylinder 28 is installed on the outer wall of the bottom of the fixed frame, and a piston rod 33 is provided at the bottom of the driving cylinder 28. A moving frame 15 is provided at the bottom end of the piston rod 33. A side sliding rail 32 is provided on the outer wall of one side of the moving frame 15. The side sliding seat 27 is slidably connected to the side sliding rail 32. An extension mounting platform 30 is installed on the outer wall of one side of the moving frame 15 close to the bottom. A clamping copper block 11 is provided on one side of the outer wall of the bottom of the extension mounting platform 30. The clamping copper block 11 is set as a top hollow rectangular loop structure.

By driving the downward pressure of the cylinder 28, the movable frame 15 on the fixed frame can be pressed down along the side slide rail 32, so that the pole 16 is pressed by the pressing copper block 11, and the top of the pressing copper block 11 is a hollow rectangular loop structure, so that the laser welding head 5 can pass through the pressing copper block 11 to weld the bus (not shown in the figure) installed on the pole 16. Under the action of the displacement mechanism, the pressing mechanisms on both sides alternately press the poles 16 and the bus (not shown in the figure) on both sides of the lithium battery pack 6, so that the welding process is more orderly and stable, and the overall structure is more suitable for laser welding, which is conducive to improving efficiency.

At the same time, the data acquisition system integrated in the clamping device of a single pole 16 is a key point. It can acquire and process data on important parameters such as the clamping position coordinates, clamping height and clamping force of the pole 16 in real time. After calculation and evaluation by the software system, these data are used to guide the precise adjustment of various process parameters during laser welding, ensuring the intelligence and automation of the welding process.

7 and 8 , in a preferred embodiment, a load sensor 26 is provided at the connection between the piston rod 33 and the movable frame 15 , and a height sensor 14 is provided on the outer wall of the fixed frame away from the movable frame 15 .

It should be noted that the load sensor 26 and height sensor 14 installed on the clamping mechanism can monitor and control the clamping force of a single pole 16 in real time, and include a height detection structure to ensure the consistency and accuracy of the clamping height; this feature overcomes the problem that traditional clamps cannot achieve independent clamping and parameter monitoring of multiple poles 16, thereby significantly improving the welding quality.

6, 7 and 9, in a preferred embodiment, an air supply pipe 18 is provided on the top outer wall of the extension mounting platform 30, and the bottom end of the air supply pipe 18 passes through the extension mounting platform 30 and is close to the pressing copper block 11, a fixed pipe 31 is provided on the top outer wall of the extension mounting platform 30, a diversion pipe is inserted on the inner wall of the fixed pipe 31, and the same smoke exhaust pipe 10 is installed on the top of the diversion pipe, and a surrounding plate 17 is provided on one side of the top outer wall of the extension mounting platform 30, and a drainage channel 25 is opened on the inner wall of one side of the surrounding plate 17, and the drainage channel 25 is connected to the fixed pipe 31.

In addition, in this solution, a protective gas supply pipeline 18 is set up in conjunction with the laser welding process to improve the welding quality by introducing inert gas to cooperate with laser welding. At the same time, the drainage channel 25 on the enclosure 17 is used to guide the exhaust gas and smoke generated after welding along the exhaust pipe 10, thereby assisting in ensuring the welding quality.

Referring to Figure 8, in a preferred embodiment, the fine-tuning mechanism includes a driving motor 12 arranged on the top outer wall of the Y-axis slide 8, one end of the output shaft of the driving motor 12 is connected to a rotating shaft 23, the rotating shaft 23 is connected to the top outer wall of the fixed joint 19 through a bearing, a rotating block 22 is installed on the outer wall of the rotating shaft 23, and the top outer walls of the two movable joints 20 are connected to connecting rods 24 through bearings, and the opposite ends of the two connecting rods 24 are respectively connected to the outer walls on both sides of the rotating block 22 through bearings.

It should be noted that the clamping mechanism as a whole exists in the form of a pressure head group, and the pressure head group is composed of three single pressure heads, and the two single pressure heads located on both sides of the fixed joint 19 are movably connected. When the driving motor 12 drives the rotating shaft 23 to rotate, the connecting rods 24 on both sides can be pushed apart or pulled together by the rotating block 22 on the outer wall of the rotating shaft 23, and the movable joint 20 can move along the top slide rail. In this way, when welding lithium battery cells of different thicknesses, adaptive adjustment can be performed through the fine-tuning mechanism. At the same time, when the installation error of some poles 16 increases, the clamping copper block 11 can be made to correspond to the position of the pole 16 more accurately through fine-tuning; when facing the production switching of products of different specifications or models, it can quickly adapt to the changes and complete the adjustment of the clamping position, significantly shortening the switching preparation time of the equipment mechanism. This feature not only enhances the stability and reliability of the production line, but also reduces the need for frequent design and processing of new clamping mechanisms due to product changes, reduces additional costs, and further improves the economic benefits of production.

The method for using the laser flying welding device for lithium battery connecting pieces is characterized by further comprising:

S1: Use the visual sensor to locate the reference point and establish a relative coordinate system; at the same time, the positioning information of the pressure head of the pole 16 is established by reading the coordinate data of all poles 16 in the database and the compensation matching algorithm;

S2: Under the action of the displacement mechanism, the Y-axis frame 2 equipped with the clamping mechanism moves to the top of the first column of lithium batteries, and the two clamping mechanisms located on the two Y-axis frames 2 correspond to the poles 16 on one side of the lithium battery respectively; the moving position is moved according to the algorithm result of the aforementioned coordinate data, and its main moving parameters include: two X-axis coordinate data, two Y-axis coordinate data, and two clamping mechanism center distance data. With the cooperation of the above parameters, the clamping mechanism accurately clamps the corresponding position;

S3: Next, the clamping mechanism on one side is pressed down to the position, and for each pressing point, the clamping force and the clamping height data are collected, and the clamping state of each point is determined;

S4: At this time, the preparation work before welding has been completed, and the welding of the first row of lithium batteries begins; the welding process is that the laser welding head 5 moves at a constant speed and performs flying welding under the drive of the accompanying moving mechanism, and its moving speed is: battery cell arrangement spacing / (2*single pole 16 welding time), and its welding sequence is to alternately weld the left and right sides, and switch through a reasonable welding point sequence to ensure that all weld positions are within the coverage range of the laser welding system during welding;

S5: After welding is completed, the displacement mechanism, accompanying movement mechanism and clamping mechanism all move to their initial positions.

The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (10)

1. A laser flying welding device for a lithium battery connecting piece, comprising two X-axis frames (1) and a top mounting frame (3), wherein a lithium battery pack (6) is provided below the X-axis frames (1), and a pole (16) is provided on the lithium battery pack (6), and two parallel Y-axis frames (2) are movably connected to the two X-axis frames (1), characterized in that it also includes: Displacement mechanism: The displacement mechanism is composed of an X-axis displacement mechanism and a Y-axis displacement mechanism, the X-axis displacement mechanism comprising an X-axis slide (7) arranged on the X-axis frame (1), and the number of the X-axis slides (7) on one X-axis frame (1) is two, the two ends of the bottom outer walls of the two Y-axis frames (2) are respectively connected to the top outer walls of the four X-axis slides (7), and the two X-axis frames (1) are each provided with an X-axis motor (34), and the X-axis motor (34) is used to drive the X-axis slide (7) to move; the Y-axis displacement mechanism comprises a Y-axis slide (8) arranged on the top of the two Y-axis frames, and the two Y-axis frames (2) are each provided with a Y-axis motor (9), and the Y-axis motor (9) is used to drive the Y-axis slide (8) to move; Accompanying movement mechanism: the accompanying movement mechanism is arranged on the top mounting frame (3); Laser welding mechanism: the laser welding mechanism is connected to the accompanying moving mechanism, the laser welding mechanism comprises a laser welding head (5) arranged on the accompanying moving mechanism, the laser welding head (5) faces directly downward; Clamping mechanism: the clamping mechanism is arranged on the Y-axis slide seat (8), and the clamping mechanism is used in conjunction with the Y-axis displacement mechanism; Fine-tuning mechanism: the fine-tuning mechanism is connected to the clamping mechanism. 2. The laser flying welding device for lithium battery connecting pieces according to claim 1 is characterized in that the accompanying moving mechanism comprises a top slide (4) arranged on the top mounting frame (3), and the laser welding head (5) is connected to the top slide (4). 3. The laser flying welding device for lithium battery connecting pieces according to claim 1, characterized in that the laser welding head (5) is located directly above the clamping mechanism. 4. The laser flying welding device for lithium battery connecting pieces according to claim 1 is characterized in that the clamping mechanism includes a connecting plate (13) arranged at the bottom of the Y-axis slide (8), a fixed joint (19) is installed at the central position of the bottom outer wall of the connecting plate (13), two top slide rails are also provided on the bottom outer wall of the connecting plate (13), and two movable joints (20) are installed on the two top slide rails, a connecting slide (29) is provided on the top outer wall of the movable joint (20), the connecting slide (29) is slidably connected to the top slide rail, and the two movable joints (20) are respectively located on both sides of the fixed joint (19). 5. The laser flying welding device for lithium battery connecting pieces according to claim 4 is characterized in that a fixing frame is installed at the bottom of the two movable joints (20) and the one fixed joint (19), two side sliding seats (27) are provided on one side outer wall of the fixing frame, a driving cylinder (28) is installed on the bottom outer wall of the fixing frame, a piston rod (33) is provided at the bottom of the driving cylinder (28), a moving frame (15) is provided at the bottom end of the piston rod (33), a side sliding rail (32) is provided on one side outer wall of the moving frame (15), the side sliding seat (27) is slidably connected to the side sliding rail (32), an extension mounting platform (30) is installed on one side outer wall of the moving frame (15) close to the bottom, a clamping copper block (11) is provided on one side of the bottom outer wall of the extension mounting platform (30), and the clamping copper block (11) is set as a top hollow rectangular loop structure. 6. The laser flying welding device for lithium battery connecting pieces according to claim 5 is characterized in that a load sensor (26) is provided at the connection between the piston rod (33) and the movable frame (15), and a height sensor (14) is provided on the outer wall of the fixed frame away from the movable frame (15). 7. The laser flying welding device for lithium battery connecting pieces according to claim 5 is characterized in that an air supply pipe (18) is provided on the top outer wall of the extension mounting platform (30), the bottom end of the air supply pipe (18) passes through the extension mounting platform (30) and is close to the pressing copper block (11), a fixed pipe (31) is provided on the top outer wall of the extension mounting platform (30), a shunt pipe is inserted on the inner wall of the fixed pipe (31), and the top of the shunt pipe is installed with the same smoke exhaust pipe (10), a side of the top outer wall of the extension mounting platform (30) is provided with a surrounding plate (17), and a drainage channel (25) is opened on the inner wall of one side of the surrounding plate (17), and the drainage channel (25) is connected to the fixed pipe (31). 8. The laser flying welding device for lithium battery connecting pieces according to claim 7 is characterized in that the fine-tuning mechanism includes a driving motor (12) arranged on the top outer wall of the Y-axis slide (8), one end of the output shaft of the driving motor (12) is connected to a rotating shaft (23), the rotating shaft (23) is connected to the top outer wall of the fixed joint (19) through a bearing, and a rotating block (22) is installed on the outer wall of the rotating shaft (23). 9. The laser flying welding device for lithium battery connecting pieces according to claim 8 is characterized in that the top outer walls of the two movable joints (20) are connected to connecting rods (24) through bearings, and the opposite ends of the two connecting rods (24) are respectively connected to the outer walls on both sides of the rotating block (22) through bearings. 10. A method for using a laser flying welding device for a lithium battery connector, characterized in that it also includes: S1: positioning the reference point by using a visual sensor to establish a relative coordinate system; at the same time, establishing the positioning information of the pressure head of the pole (16) by reading the coordinate data of all poles (16) in the database and using a compensation matching algorithm; S2: Under the action of the displacement mechanism, the Y-axis frame (2) equipped with the clamping mechanism is moved to the top of the first row of lithium batteries, and the two clamping mechanisms located on the two Y-axis frames (2) respectively correspond to the poles (16) on one side of the lithium batteries; the moving position is moved according to the algorithm result of the above-mentioned coordinate data, and its main moving parameters include: two X-axis coordinate data, two Y-axis coordinate data, and two clamping mechanism center distance data. With the cooperation of the above parameters, the clamping mechanism accurately clamps the corresponding position; S3: Next, the clamping mechanism on one side is pressed down to the position, and for each pressing point, the clamping force and the clamping height data are collected, and the clamping state of each point is determined; S4: At this time, the preparation work before welding has been completed, and the welding of the first row of lithium batteries begins; the welding process is that the laser welding head (5) moves at a constant speed and performs flying welding under the drive of the accompanying moving mechanism, and its moving speed is: battery cell arrangement spacing/(2*single pole (16) welding time), and its welding sequence is to alternately weld the left and right sides, and switch through a reasonable welding point sequence to ensure that all weld positions are within the coverage range of the laser welding system during welding; S5: After welding is completed, the displacement mechanism, accompanying movement mechanism and clamping mechanism all move to their initial positions.