Battery cell welding production line and battery cell welding method

Abstract

The invention provides a battery cell welding production line and a battery cell welding method. The battery cell welding production line comprises a magnetic suspension conveying line, a rotor jig, a spot welding device and a peripheral welding device, wherein the spot welding device and the peripheral welding device are sequentially arranged along the conveying path of the rotor jig; the spot welding device is used for pre-welding a battery cell shell and a cover plate on the rotor jig; the peripheral welding device is used for welding side edges of a battery cell shell and a cover plate, the peripheral welding device comprises four welding mechanisms which are sequentially arranged at intervals along the magnetic suspension conveying line and first turnover mechanisms arranged between every two adjacent welding mechanisms, and the first turnover mechanisms are used for turning over the battery cells on the rotor jig by 90 degrees; and the four side edges of the battery cell shell and the cover plate are sequentially welded by the corresponding welding mechanisms. According to the battery cell welding production line, the scheme that the cover plate and the battery cell shell are welded in the battery cell conveying process is beneficial for improving the welding continuity of the battery cell, so that the production takt is facilitated, the welding efficiency is improved, and the space occupation amount of the production line is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery core welding production line; meanwhile, the present invention also relates to a battery core welding method. Background Art

[0002] Blade cells require welding of the cover plate and the cell shell during the production process. Specifically, the cover plate is first pressed onto the cell shell, and then spot welding is performed on the four sides of the cover plate and the cell shell to complete the pre-welding of the cover plate. Then, peripheral welding is performed on the four sides of the cover plate and the cell shell to complete the welding between the cover plate and the cell shell.

[0003] At present, most of the welding production lines for cover plates and cell shells achieve high production capacity by stacking more workstations. At the same time, the transfer of products between workstations has become a bottleneck of the equipment. Especially when performing peripheral welding on cover plates and cell shells, the cells need to be moved out of the original conveyor line and sent to the welding equipment. After completing the peripheral welding of the cells, the cells are sent back to the original conveyor line for transportation, which affects the production rhythm. In addition, this layout also sets up a large equipment footprint, with many workstations and dense distribution, which makes maintenance and repair inconvenient. Summary of the invention

[0004] In view of this, the present invention aims to provide a battery cell welding production line to improve the welding efficiency between the cover plate and the battery cell shell.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A battery core welding production line comprises a magnetic suspension conveyor line, a mover fixture movably arranged on the magnetic suspension conveyor line, and a spot welding device and a peripheral welding device sequentially arranged along the conveying path of the mover fixture;

[0007] The spot welding device is used to pre-weld the cell housing and the cover plate on the mover fixture;

[0008] The peripheral welding device is used to weld the side edges of the battery cell shell and the cover plate, and the peripheral welding device includes four welding mechanisms arranged in sequence along the magnetic levitation conveyor line, and a first flipping mechanism arranged between two adjacent welding mechanisms, and the first flipping mechanism is used to flip the battery cell on the mover fixture by 90° so that the four side edges of the battery cell shell and the cover plate are welded in sequence by the corresponding welding mechanisms.

[0009] Furthermore, a first welding detection device, a rolling device and a second welding detection device are sequentially provided downstream of the peripheral welding device; the first welding detection device is used to detect the welding area of ​​the battery cell shell and the cover plate before rolling, the rolling device is used to roll the welding area, and the second welding detection device is used to detect the welding area after rolling.

[0010] Further, the first welding detection device includes a 2D detection unit; and / or, the second welding detection device includes two groups of 3D detection units sequentially arranged along the conveying direction of the mover fixture, and a second flipping mechanism arranged between two adjacent 3D detection units;

[0011] The second flipping mechanism is used to flip the battery cell on the mover fixture by 90° so that one group of the 3D detection parts can detect the two long sides of the battery cell housing and the cover plate, and the other group of the 3D detection parts can detect the two short sides of the battery cell housing and the cover plate.

[0012] Furthermore, the magnetic levitation conveyor line is in the shape of a "mouth", and has four conveying sections arranged in sequence, and the connection between two conveying sections is connected by a turntable; the first welding detection device, the rolling device and the second welding detection device are arranged on the same conveying section, the spot welding device is arranged opposite to the first welding detection device, and the peripheral welding device is arranged on the conveying section between the spot welding device and the first welding detection device.

[0013] Furthermore, the conveying section arranged opposite to the peripheral welding device is provided with two high-altitude lifting mechanisms arranged at intervals, and a high-altitude reflow section arranged between the two high-altitude lifting mechanisms.

[0014] Furthermore, the spot welding device includes a movable seat arranged to move along the vertical direction, a clamping seat rotatably arranged on the movable seat, a driving part arranged on the movable seat for driving the clamping seat to rotate, and a first welding part; the clamping seat is provided with a clamping part for taking and placing the battery cell, and the first welding part is used to spot weld the four sides of the battery cell shell and the cover plate respectively.

[0015] Furthermore, the movable fixture includes a fixture body, on which a first supporting portion, a second supporting portion, and a pressing portion are provided; the first supporting portion is used to support the horizontally arranged battery cell, and the second supporting portion is used to support the vertically placed battery cell, and the pressing portion has a working position that can be located on the battery cell and limit the upward movement of the battery cell, as well as an initial position for releasing the limit on the battery cell.

[0016] Further, the first supporting portion is a supporting surface provided on the jig body, and the second supporting portion is a supporting groove provided on the jig body; and / or, the jig body is provided with a rotating lifting mechanism which is arranged one-to-one with the lower pressing portion, and the lower pressing plate includes a pressing plate provided at the output end of the rotating lifting mechanism.

[0017] Furthermore, the jig body is provided with a pressing portion for pressing the cover plate onto the battery cell housing.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The battery cell welding production line described in the present invention pre-welds the battery cell shell and the cover plate through a spot welding device, flips the battery cell on the mover fixture 90° through a first flipping mechanism, and welds the four sides of the battery cell shell and the cover plate in sequence through a welding mechanism. This solution of welding the cover plate and the battery cell shell during the battery cell transportation process is beneficial to improving the welding continuity of the battery cell, thereby facilitating the production cycle and welding efficiency, and also helping to reduce the space occupancy of the production line, compared with the solution in the prior art of moving the battery cell out of the conveyor line and entering a separate welding device for welding and then returning the battery cell to the conveyor line after welding is completed.

[0020] In addition, the first welding detection device detects the welding area of ​​the battery cell shell and the cover plate before rolling, which is conducive to ensuring the welding quality after peripheral welding. The rolling device is conducive to further improving the peripheral welding effect of the cover plate and the battery cell shell. The second welding detection device is conducive to further detecting the quality of the welding area after rolling. The 2D detection unit is conducive to detecting the welding quality of the welding area before rolling; the 3D detection unit and the second flipping mechanism are conducive to sequentially detecting the welding quality of each long side and short side during the flipping of the battery cell, and are also conducive to ensuring the conveying rhythm of the battery cell during the detection process. The setting of four conveying sections and turntables is conducive to the layout of the magnetic levitation conveyor line, and the layout of each device on the conveying section is conducive to improving the welding efficiency of the battery cell.

[0021] In addition, the setting of two high-altitude lifting mechanisms and a high-altitude return section is conducive to ensuring the conveying effect of the moving fixture, and a channel for personnel to pass can be formed under the high-altitude return section, thereby improving the flexibility of the magnetic suspension conveyor line in use. The battery cell is clamped by the clamping force on the clamping seat, and spot welding can be performed through the first welding part during the process of the driving part driving the clamping seat to rotate, thereby improving the spot welding efficiency. The setting of the fixture body, the first supporting part, the second supporting part and the pressing part is conducive to ensuring that the battery cell has a working position and an initial position, thereby meeting the use requirements of spot welding. The structure of the supporting surface and the supporting groove is simple and easy to arrange and implement; the structure of the rotating lifting mechanism and the pressing plate is simple, which is conducive to pressing down or releasing the pressing of the battery cell, thereby changing the state of the battery cell. The setting of the pressing part is conducive to ensuring the welding effect between the cover plate and the battery cell shell.

[0022] In addition, another object of the present invention is to provide a battery cell welding method, first using a spot welding device to pre-weld the battery cell shell and the cover plate, and then performing peripheral welding on the side edges of the cover plate and the battery cell shell in turn while the pre-welded battery cell is moved in a flipping manner.

[0023] The battery cell welding method of the present invention enables the pre-welded battery cell to be flipped over and peripherally welded to the sides of the cover plate and the battery cell shell in sequence during movement, thereby improving the welding efficiency between the cover plate and the battery cell shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of a battery core welding production line according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic structural diagram of the first conveying section according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic structural diagram of the second conveying section according to an embodiment of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the third conveying section according to an embodiment of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the fourth conveying section according to an embodiment of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the mover fixture according to an embodiment of the present invention;

[0031] Figure 7 It is a partial structural schematic diagram of a spot welding device according to an embodiment of the present invention;

[0032] Figure 8 It is a partial structural schematic diagram of the mover fixture described in an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Movable fixture; 2. Moving seat; 3. Clamping seat; 4. First welding mechanism; 5. Second welding mechanism; 6. Third welding mechanism; 7. Fourth welding mechanism; 8. First turning mechanism; 9. Second turning mechanism; 10. Third turning mechanism; 11. Turntable; 12. First welding detection device; 13. Second welding detection device; 14. Third welding detection device; 15. Rolling device; 16. Spot welding device; 17. Pressing device;

[0035] 100, first conveying section; 200, second conveying section; 300, third conveying section; 400, fourth conveying section; 500, battery cell;

[0036] 301, clamping plate;

[0037] 101. Pressing plate; 102. Rotating lifting mechanism; 103. Supporting slot;

[0038] 401. High altitude lifting mechanism; 402. High altitude reflux section. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0040] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0042] The present embodiment relates to a battery cell welding production line. In terms of overall structure, the battery cell welding production line includes a magnetic levitation conveyor line, a mover fixture 1 movably arranged on the magnetic levitation conveyor line, and a spot welding device 16 and a peripheral welding device sequentially arranged along the conveying path of the mover fixture 1.

[0043] Among them, the spot welding device 16 is used to pre-weld the battery cell shell and the cover plate on the mover fixture 1. The peripheral welding device is used to weld the sides of the battery cell shell and the cover plate, and the peripheral welding device includes four welding mechanisms arranged in sequence along the magnetic suspension conveyor line, and a first flipping mechanism 8 arranged between two adjacent welding mechanisms. The first flipping mechanism 8 is used to flip the battery cell 500 on the mover fixture 1 by 90°, so that the four sides of the battery cell shell and the cover plate are welded in sequence by the corresponding welding mechanisms.

[0044] The battery cell welding production line described in this embodiment pre-welds the battery cell shell and the cover plate through the spot welding device 16, flips the battery cell 500 on the mover fixture 1 by 90° through the first flipping mechanism 8, and welds the four sides of the battery cell shell and the cover plate in sequence through the welding mechanism. This scheme of welding the cover plate and the battery cell shell during the transportation of the battery cell 500 is beneficial to improving the welding continuity of the battery cell 500, thereby facilitating the production cycle and welding efficiency, and also helping to reduce the space occupancy of the production line, compared with the scheme in the prior art of moving the battery cell 500 out of the conveyor line and entering a separate welding device for welding and then returning it to the conveyor line after welding is completed.

[0045] Based on the above overall introduction, an exemplary structure of the battery core welding production line shown in this embodiment is as follows Figure 1 As shown in . A first welding detection device 12, a rolling device 15 and a second welding detection device 13 are sequentially arranged downstream of the peripheral welding device. The first welding detection device 12 is used to detect the welding area of ​​the battery cell shell and the cover before rolling, the rolling device 15 is used to roll the welding area, and the second welding detection device 13 is used to detect the welding area after rolling.

[0046] In terms of specific structure, Figure 1 As shown in , the magnetic suspension conveyor line is in the shape of a "mouth", and has four conveyor sections arranged in sequence, and the connection between the two conveyor sections is connected by a turntable 11; the first welding detection device 12, the rolling device 15 and the second welding detection device 13 are arranged on the same conveyor section, the spot welding device 16 is arranged opposite to the first welding detection device 12, and the peripheral welding device is arranged on the conveyor section between the spot welding device 16 and the first welding detection device 12. Here, the arrangement of the four conveyor sections and the turntable 11 is conducive to the arrangement of the magnetic suspension conveyor line, and the arrangement of each device on the conveyor section is conducive to improving the welding efficiency of the battery cell 500.

[0047] In order to distinguish the four conveying sections, Figure 1 As a reference, the viewing angle shown in Figure 1The conveying section on the left side is called the first conveying section 100, the conveying section on the upper side is called the second conveying section 200, the conveying section on the right side is called the third conveying section 300, and the conveying section on the lower side is called the fourth conveying section 400. The spot welding device 16 is arranged at the first conveying section 100, the peripheral welding device is arranged at the second conveying section 200, and the first welding detection device 12, the rolling device 15 and the second welding detection device 13 are arranged at the third conveying section 300. Among them, the part of the first conveying section 100 close to the fourth conveying section 400 has a loading position for the battery cell 500, so as to facilitate the loading of the battery cell 500 pre-installed with the cover plate onto the mover fixture 1. The part of the third conveying section 300 close to the fourth conveying section 400 has a unloading position for the battery cell 500.

[0048] In this embodiment, the movable fixture 1 at the end of the third conveying section 300 flows back to the loading position of the first conveying section 100 through the fourth conveying section 400. This facilitates the reciprocating movement of the movable fixture 1, thereby facilitating the transportation and welding of the battery cells 500, and further facilitating the improvement of the welding efficiency of the battery cells 500. In order to improve the welding efficiency of the battery cells 500, a plurality of movable fixtures 1 are grouped together to facilitate the loading of a plurality of battery cells 500 separately and transport them along the magnetic levitation conveyor line. The number of movable fixtures 1 here can be determined according to usage requirements. The movable fixture 1 after loading moves along the Figure 1 The steel sheet moves on the first conveying section 100 in the direction indicated by the middle arrow, and is welded by the spot welding device 16 in sequence.

[0049] To ensure the spot welding effect between the cell shell and the cover plate, a press fitting device 17 is provided at the feeding end of the first conveying section 100 to improve the press fitting effect of the cover plate on the cell shell by applying pressure to the cover plate. The press fitting device 17 here can be a product in the prior art, which will not be described in detail here.

[0050] As a preferred embodiment, Figures 6 to 8 As shown in , in this embodiment, the mover fixture 1 includes a fixture body, and the fixture body is provided with a first supporting portion, a second supporting portion, and a pressing portion. Among them, the first supporting portion is used to support the horizontally arranged battery cell 500, the second supporting portion is used to support the vertically placed battery cell 500, and the pressing portion has a working position that can be located on the battery cell 500 and limit the upward movement of the battery cell 500, and an initial position that releases the limit on the battery cell 500. Here, the arrangement of the fixture body, the first supporting portion, the second supporting portion, and the pressing portion is conducive to ensuring that the battery cell 500 has a working position and an initial position, thereby meeting the use requirements of spot welding.

[0051] In terms of specific structure, the jig body serves as an installation carrier, and is overall in the shape of an elongated strip. The first supporting portion is a supporting surface provided on the jig body, and the second supporting portion is a supporting groove 103 provided on the jig body. Among them, the supporting groove 103 is located in the middle of the width direction of the jig body, and is extended along the length direction of the jig body. The supporting surface is specifically the top surface of the jig body. Due to the setting of the supporting groove 103, the supporting surfaces are respectively provided on both sides of the width direction of the notch of the supporting groove 103. In the initial state, the battery cell 500 is placed horizontally on the supporting surface. After the first flipping mechanism 8 flips the battery cell 500, the battery cell 500 is placed vertically in the supporting groove 103. Here, the structure of the supporting surface and the supporting groove 103 is simple, easy to arrange and implement, and has a good supporting effect on the battery cell 500.

[0052] As a preferred embodiment, the pressing parts are two and are respectively arranged on each side of the width direction of the jig body. The jig body is provided with a rotating lifting mechanism 102 which is arranged one-to-one with the pressing parts, and the lower pressing plate 101 includes a pressing plate 101 arranged at the output end of the rotating lifting mechanism 102. The rotating lifting mechanism 102 and the pressing plate 101 have a simple structure, which is conducive to pressing down or releasing the pressing of the battery cell 500, thereby facilitating changing the state of the battery cell 500. Among them, the rotating lifting mechanism 102 can be lifted and lowered while rotating, so that the pressing plate 101 abuts against the top surface of the battery cell 500, thereby fixing the battery cell 500 on the supporting surface. In specific implementation, the rotating lifting mechanism 102 can adopt a rotating lifting cylinder or a rotating lifting spring cylinder in the prior art, as long as it is ensured that the pressing plate 101 can be driven by the rotating lifting mechanism 102 to be lifted and lowered while rotating.

[0053] In addition, in order to ensure the press-fit state of the cover plate on the battery cell shell, a press-fitting portion for press-fitting the cover plate on the battery cell shell is provided on the jig body. The provision of the press-fitting portion is conducive to ensuring the welding effect between the cover plate and the battery cell shell. The press-fitting portion here includes a press-fitting plate slidably arranged at one end of the jig body, and the jig body is also provided with a driving mechanism for driving the press-fitting plate to move. When the cover plate needs to be limited, the driving mechanism drives the press-fitting plate to move in a direction close to the cover plate. In specific implementation, the driving mechanism can adopt a power product that outputs a linear driving force, such as a motor or a cylinder.

[0054] In this embodiment, Figure 7As shown in , the spot welding device 16 includes a moving seat 2 that is movable and arranged in a vertical direction, a clamping seat 3 that is rotatably arranged on the moving seat 2, a driving part that is arranged on the moving seat 2 and is used to drive the clamping seat 3 to rotate, and a first welding part. The clamping seat 3 is provided with a clamping part for taking out the battery cell 500, and the first welding part is used to spot weld the four sides of the battery cell shell and the cover plate respectively. The battery cell 500 is clamped by the clamping force on the clamping seat 3, and spot welding can be performed through the first welding part during the process of the driving part driving the clamping seat 3 to rotate, thereby helping to improve the spot welding efficiency.

[0055] In terms of specific structure, Figure 7 As shown in , the movable seat 2 is arranged above the first conveying section 100, and serves as a mounting carrier for the clamping seat 3. The movable seat 2 can be driven to move up and down by a linear module, and can also be driven to move up and down by other products that can output linear driving force. The two ends of the clamping seat 3 are respectively rotatably arranged on the movable seat 2 through a rotating shaft, and the driving part can adopt a motor, and its power output end is connected to the rotating shaft, so as to drive the clamping seat 3 to rotate. The clamping part is respectively arranged on the left and right sides of the clamping seat 3, and the clamping part includes a clamping plate 301 slidably arranged along the width direction of the clamping seat 3, and a linear driving part for driving the clamping plate 301 to move. Among them, the clamping plate 301 is in an "L" shape, so that the side and bottom of the battery cell 500 can be limited, thereby facilitating the improvement of the clamping effect of the battery cell 500.

[0056] In addition, avoidance holes are provided on the clamping seat 3 corresponding to the sides of the cover plate and the battery cell shell. The first welding part includes a first welding machine, whose welding head is provided corresponding to the sides of the cover plate and the battery cell shell. When the clamping seat 3 drives the battery cell 500 to rotate, the first welding machine spot welds each side in turn, thereby completing the pre-welding of the cover plate and the battery cell shell. It should be noted that the number and position of the first welding parts are also adapted to the number of cover plates. When cover plates are provided at both ends of the battery cell shell, two first welding parts need to be provided, and the cover plate and the battery cell shell are pre-welded at the same time, which is conducive to further improving the welding efficiency.

[0057] After the pre-welding of the cover plate and the cell shell is completed, the moving seat 2 moves downward, and then the clamping part releases the clamping of the cell 500, and the cell 500 can be put back on the moving fixture 1, and continue to move on the first conveying section 100. The turntable 11 in this embodiment can adopt the product in the prior art, which can change the direction of the moving fixture 1, so that the moving fixture 1 can reciprocate on the entire magnetic suspension conveyor line.

[0058] In order to distinguish the welding mechanism, Figure 3As shown in the figure, the welding mechanisms along the moving path of the mover fixture 1 are respectively referred to as the first welding mechanism 4, the second welding mechanism 5, the third welding mechanism 6 and the fourth welding mechanism 7. Among them, the first welding mechanism 4 is capable of welding the first long side of the moving cover plate and the battery cell housing. The first flip mechanism 8 located upstream includes clamping blocks corresponding to the two ends of the mover fixture 1, a linear power output mechanism for driving the two clamping blocks to approach each other to clamp the two ends of the battery cell 500, and a rotary power output mechanism for driving the linear power output mechanism to rotate, and a lifting mechanism for driving the rotary power output mechanism to rise and fall.

[0059] The linear power output mechanism drives the two clamping blocks to clamp, the pressing part releases the pressing on the battery cell 500, the lifting mechanism drives the battery cell 500 to move upward through the clamping block, and the rotary power output mechanism drives the battery cell 500 to rotate 90° and then put the battery cell 500 back into the supporting groove 103, so that the cover plate and the first short side of the battery cell housing are arranged upward. The second welding mechanism 5 can weld the first short side in motion.

[0060] Then, the first flipping mechanism 8 located in the middle continues to flip the battery cell 500 90° and put it back on the supporting surface, so that the second long side of the battery cell shell and the cover plate is set upward, and the third welding mechanism 6 welds the second long side of the battery cell 500 being transported. The first flipping mechanism 8 located downstream continues to flip the battery cell 500 90° and put it back into the supporting groove 103, and so that the second short side of the battery cell shell and the cover plate is set upward, and the fourth welding mechanism 7 welds the second short side of the battery cell 500 being transported. In this way, the battery cell 500 can be turned over during the transportation process so that different sides are set upward, and welded by the corresponding first welding mechanism 4, which is conducive to the continuous welding of the battery cell 500 and can be integrated on the magnetic suspension conveyor line, which is conducive to reducing the space occupied.

[0061] like Figure 4 As shown in the figure, the first welding detection device 12 in this embodiment includes a 2D detection part, which is conducive to detecting the welding quality of the welding area before rolling. The second welding detection device 13 includes two groups of 3D detection parts arranged in sequence along the conveying direction of the movable fixture 1, and a second flipping mechanism 9 arranged between two adjacent 3D detection parts.

[0062] Among them, the second flipping mechanism 9 is used to flip the battery cell 500 on the movable fixture 1 by 90°, so that one group of its 3D detection parts can detect the two long sides of the battery cell shell and the cover plate, and the other group of 3D detection parts can detect the two short sides of the battery cell shell and the cover plate. The 3D detection part and the second flipping mechanism 9 are conducive to the detection of the welding quality of each long side and short side in turn during the flipping of the battery cell 500, and are also conducive to ensuring the conveying rhythm of the battery cell 500 during the detection process. Furthermore, in order to facilitate the resetting of the battery cell 500, a third flipping mechanism 10 can also be set downstream of the 3D detection part located downstream to flip the battery cell 500 by 90°. In this embodiment, the second flipping mechanism 9 and the third flipping mechanism 10 have the same structure as the first flipping mechanism 8 and the same working principle.

[0063] The 3D detection unit located upstream is used to detect the upper cover plate on the supporting surface and the two long sides on the upper and lower sides of the battery cell shell. After the inspection, the battery cell 500 is flipped to a vertical state by the second flipping mechanism 9 and placed in the supporting groove 103. The 3D detection unit located downstream is used to detect the upper and lower short sides of the upper and lower covers on the supporting surface and the battery cell shell. In specific implementation, the 2D detection unit can adopt a 2D camera used in industry, and the 3D detection unit can adopt a 3D camera used in industry. When covers are provided at both ends of the battery cell shell, each detection unit is respectively provided corresponding to the two ends of the battery cell 500 to further improve the detection efficiency.

[0064] In addition, in order to further improve the use effect of the battery core welding production line, such as Figure 4 As shown in the figure, a third welding detection device 14 located upstream of the first welding mechanism 4 can also be provided on the second conveying section 200, and the third welding detection device 14 includes two 2D detection parts spaced apart along the conveying direction of the mover fixture 1 to respectively detect the welding quality of the two long sides of the cover plate and the battery cell shell.

[0065] like Figure 5 As shown in , there are two high-altitude lifting mechanisms 401 arranged at intervals on the conveying section arranged opposite to the peripheral welding device, and a high-altitude return section 402 arranged between the two high-altitude lifting mechanisms 401. The arrangement of the two high-altitude lifting mechanisms 401 and the high-altitude return section 402 is conducive to ensuring the conveying effect of the moving fixture 1, and a passage for personnel to pass through can be formed under the high-altitude return section 402, thereby improving the flexibility of the magnetic levitation conveyor line in use. Here, the high-altitude lifting mechanism 401 can adopt products in the prior art, as long as it ensures that the moving fixture 1 can be conveyed on the fourth conveying section 400 through the high-altitude return section 402.

[0066] When the battery core welding production line in this embodiment is used, Figure 1As shown, first, the battery cell 500 is loaded onto the movable fixture 1, and the pressing part presses the battery cell 500 and conveys it along the first conveying section 100. When it reaches the spot welding position, the movable seat 2 descends to a preset position, and clamps the battery cell 500 on the clamping seat 3 through the clamping part, and then the clamping seat 3 is rotated so that the first welding part spot welds the four sides of the cover plate and the battery cell shell respectively. After completing the pre-welding of the battery cell 500, the battery cell 500 is placed on the movable fixture 1 and continues to be conveyed backward. After being conveyed to the second conveying section 200, the spot welding quality is first inspected by the third welding detection device 14.

[0067] When the movable fixture 1 moves to the first welding mechanism 4, the first long side of the cover plate and the battery cell shell is welded, the first flip mechanism 8 located upstream flips the battery cell 500 90°, the second welding mechanism 5 welds the cover plate and the first short side of the battery cell shell, the first flip mechanism 8 located in the middle continues to flip the battery cell 500 90°, and the third welding mechanism 6 welds the cover plate and the second long side of the battery cell shell. The first flip mechanism 8 located downstream continues to flip the battery cell 500 90°, and then the fourth welding mechanism 7 welds the cover plate and the second short side of the battery cell shell, thereby completing the peripheral welding of the battery cell 500, and allowing the movable fixture 1 to continue to transport the battery cell 500.

[0068] When the mover fixture 1 is conveyed on the third conveying section 300, the welding quality is inspected by the first welding detection device 12, and then the welding area is rolled by the rolling device 15. Then the 3D detection unit located upstream detects the welding quality of the long side. After the second flipping mechanism 9 flips the battery cell 500 90°, the downstream 3D detection unit detects the welding quality of the short side. The third flipping mechanism 10 continues to flip the battery cell 500 90°, so that the long sides of the battery cell shell and the cover plate are set upward again. When the mover battery cell 500 is conveyed to the unloading position, the robot grabs the qualified battery cell 500 for unloading.

[0069] For unqualified battery cells 500, when conveyed to the entrance end of the fourth conveying section 400, the unqualified battery cells 500 are moved to the unqualified battery cell 500 collection area on one side of the fourth conveying section 400 by a manipulator. The moving fixture 1 enters the high-altitude return section 402 through the upstream high-altitude lifting mechanism 401, and continues to be conveyed on the fourth conveying section 400 through the downstream high-altitude lifting device until it returns to the loading position of the battery cell 500.

[0070] The staff can enter and exit the space defined by the magnetic suspension conveyor line through the space below the high-altitude return section 402, and can realize the regular transportation of various auxiliary materials to the manual loading position or the designated centralized placement area. Sufficient maintenance and repair areas are reserved on both sides of the equipment unit, realizing the requirements of high-speed production and extremely simplified design. The mover fixture 1 in this embodiment has uniform specifications and good interchangeability. While reducing the types of pallets, it also reduces the grabbing of the battery cell 500 during transportation between processes, greatly reducing the machine loss of the entire line, and effectively improving the quality of the battery cell 500.

[0071] In addition, the present embodiment also relates to a battery cell welding method, which first uses a spot welding device 16 to pre-weld the battery cell shell and the cover plate, and then performs peripheral welding on each side of the cover plate and the battery cell shell in turn while the pre-welded battery cell 500 is moving in a flipping manner.

[0072] The battery cell welding method may be applied to a battery cell welding production line. The steps of spot welding and peripheral welding of the battery cell 500 are described in detail above and will not be repeated here.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery core welding production line, characterized in that: It includes a magnetic suspension conveyor line, a mover fixture movably arranged on the magnetic suspension conveyor line, and a spot welding device and a peripheral welding device sequentially arranged along the conveying path of the mover fixture; The spot welding device is used to pre-weld the cell housing and the cover plate on the mover fixture; The peripheral welding device is used to weld the side edges of the battery cell shell and the cover plate, and the peripheral welding device includes four welding mechanisms arranged in sequence along the magnetic levitation conveyor line, and a first flipping mechanism arranged between two adjacent welding mechanisms, and the first flipping mechanism is used to flip the battery cell on the mover fixture by 90° so that the four side edges of the battery cell shell and the cover plate are welded in sequence by the corresponding welding mechanisms.

2. The battery core welding production line according to claim 1, characterized in that: A first welding detection device, a rolling device and a second welding detection device are provided in sequence downstream of the peripheral welding device; The first welding detection device is used to detect the welding area of ​​the battery cell shell and the cover plate before rolling, the rolling device is used to roll the welding area, and the second welding detection device is used to detect the welding area after rolling.

3. The battery core welding production line according to claim 2, characterized in that: The first welding detection device comprises a 2D detection unit; and / or, The second welding detection device comprises two groups of 3D detection parts arranged in sequence along the conveying direction of the mover fixture, and a second flipping mechanism arranged between two adjacent 3D detection parts; The second flipping mechanism is used to flip the battery cell on the mover fixture by 90° so that one group of the 3D detection parts can detect the two long sides of the battery cell housing and the cover plate, and the other group of the 3D detection parts can detect the two short sides of the battery cell housing and the cover plate.

4. The battery core welding production line according to claim 2, characterized in that: The magnetic suspension conveyor line is in the shape of a "mouth", and has four conveying sections connected in sequence, and the connection points of two conveying sections are connected through a turntable; The first welding detection device, the rolling device and the second welding detection device are arranged on the same conveying section, the spot welding device is arranged opposite to the first welding detection device, and the peripheral welding device is arranged on the conveying section between the spot welding device and the first welding detection device.

5. The battery core welding production line according to claim 4, characterized in that: The conveying section arranged opposite to the peripheral welding device is provided with two high-altitude lifting mechanisms arranged at intervals, and a high-altitude reflow section arranged between the two high-altitude lifting mechanisms.

6. The battery core welding production line according to claim 1, characterized in that: The spot welding device comprises a moving seat arranged to move in a vertical direction, a clamping seat rotatably arranged on the moving seat, a driving part arranged on the moving seat and used to drive the clamping seat to rotate, and a first welding part; The clamping seat is provided with a clamping portion for taking and placing the battery core, and the first welding portion is used to spot weld the four side edges of the battery core shell and the cover plate respectively.

7. The battery core welding production line according to claim 1, characterized in that: The mover fixture comprises a fixture body, on which a first supporting portion, a second supporting portion, and a pressing portion are provided; The first supporting portion is used to support the battery cell arranged horizontally, the second supporting portion is used to support the battery cell placed vertically, and the pressing portion has a working position that can be located on the battery cell and limit the upward movement of the battery cell, and an initial position for releasing the limitation on the battery cell.

8. The battery core welding production line according to claim 7, characterized in that: The first supporting portion is a supporting surface provided on the fixture body, and the second supporting portion is a supporting groove provided on the fixture body; and / or, The fixture body is provided with a rotary lifting mechanism arranged in one-to-one correspondence with the lower pressing part, and the lower pressing plate includes a pressing plate arranged at the output end of the rotary lifting mechanism.

9. The battery core welding production line according to any one of claims 1 to 8, characterized in that: The jig body is provided with a press-fitting portion for press-fitting the cover plate onto the battery cell housing.

10. A battery core welding method, characterized in that: First, the battery cell housing and the cover plate are pre-welded using a spot welding device, and the side edges of the cover plate and the battery cell housing are sequentially peripherally welded while the pre-welded battery cell is moved in a flipping manner.

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