Battery piece grabbing reverse bending tool, carrying device and battery piece correcting method

Abstract

The present application relates to the technical field of solar cell production, and particularly relates to a cell piece grabbing reverse bending tool, a carrying device and a cell piece correction method. The cell piece grabbing reverse bending tool is applied to a cell string carrying device. The cell string carrying device carries a cell string from one station to a next station in the air. The cell string includes a plurality of cell pieces connected by a welding strip. The cell piece grabbing reverse bending tool bends the cell pieces in the opposite direction of welding stress bending during the carrying process of the cell string. On the reverse bending curve of the cell piece, the included angle formed by the inflection point of the reverse bending curve and the end points of the two reverse bending curves is 0-12.5 degrees. The present application bends the cell pieces in the opposite direction of welding stress bending, so that the released cell pieces can recover flatness after reaching the next station. The present application does not need to increase new shaping equipment, does not need to occupy the space in the workshop, does not increase the time-consuming for processing deformation, and does not affect the production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of solar cell manufacturing technology, specifically relating to a solar cell gripping and bending fixture, a conveying device, and a solar cell correction method. Background Technology

[0002] In the production process of back-contact batteries, multiple battery cells need to be welded together with welding ribbons. The battery cells are arranged on a welding platform, and multiple welding ribbons are welded to the upper surface of the battery cells. The welding ribbons connect two adjacent battery cells to form a battery string.

[0003] Because the welding strip and the battery cell are made of different materials, and the welding is done on one side only, after welding, the battery cell will curl towards the side with the welding strip due to welding stress, causing both ends of the battery cell to curl upwards.

[0004] In existing technologies, a straightening table is used to straighten welded battery strings. The table has multiple arc-shaped protrusions and negative pressure holes. The welded battery strings are placed on the straightening table, and the battery cells are aligned with the protrusions and adhered to them. This causes the upward-curving ends of the battery string to conform to the protrusions, bending downwards at both ends. This is maintained for a period of time, causing the battery cells to bend in the opposite direction, eliminating the effects of welding stress. The battery strings are then transferred to the next workstation. However, this method requires an additional straightening table, occupies a large area, and is not suitable for factories with limited space. Furthermore, this method adds straightening time, significantly reducing production efficiency.

[0005] Therefore, a new technology is needed to solve the problems of existing technologies that require large space and increase correction time for bending of battery cells. Summary of the Invention

[0006] This invention provides a battery cell gripping and bending fixture, a conveying device, and a battery cell correction method. The bending correction equipment has the problems of large footprint and increased correction time.

[0007] The embodiments of the present invention are implemented as follows:

[0008] In a first aspect, the present invention provides a battery cell gripping and reverse bending fixture, which is applied to a battery string transport device. The battery string transport device suspends and transports a battery string from one station to the next station. The battery string includes multiple battery cells connected by welding strips. During the transport of the battery string, the battery cell gripping and reverse bending fixture bends the battery cells in the opposite direction of the welding stress bending. On the reverse bending line of the battery cell, the included angle formed by the endpoints of the two reverse bending lines sequentially passing through the inflection point of the reverse bending line is 0° to 12.5°.

[0009] Furthermore, the battery cell gripping and reverse bending fixture includes:

[0010] A frame that moves between two workstations;

[0011] An adsorption assembly is provided on the frame, corresponding one-to-one with the battery cell. The adsorption assembly includes multiple adsorption elements, each of which corresponds to the stress-bending bottom of the welding surface of the battery cell.

[0012] The pressing structures are located on both sides of the adsorption assembly, and each pressing structure includes a plurality of pressing elements, which are retractably mounted on the frame.

[0013] A first driving device that drives the pressing member to press downwards; and

[0014] The pressing member presses the stress-bending end of the welding surface of the battery cell, causing the battery cell to bend in the opposite direction, and the height difference between the lower end of the pressing member and the lower end of the adsorption member is 0-10mm.

[0015] Furthermore, the pressing component is fixedly connected to a guide rod, the upper end of which is slidably connected to the frame in the longitudinal direction, and a limiting component is connected to the guide rod above the frame.

[0016] The first driving device is an elastic element, one end of which abuts against the frame and the other end of which abuts against the pressing element;

[0017] When the adsorption member descends to adsorb the battery cell, the pressing member compresses the elastic member and shortens the length of the guide rod extending downward.

[0018] Furthermore, the pressing element is a pressing rod or a buffer element, and the pressing rod is parallel to the edge line of the stress-bending end of the battery cell welding surface.

[0019] Furthermore, multiple buffer components are sequentially fixed to the lower end of the pressing rod.

[0020] Furthermore, the bottom surface of the pressing rod is provided with a groove for the edge of the battery cell to be inserted.

[0021] Furthermore, at the junction of two of the battery cells, the number of pressing structures is one or two.

[0022] Furthermore, the battery cell gripping and reverse bending fixture includes:

[0023] A frame that moves between two workstations;

[0024] A second drive unit fixed to the frame;

[0025] An adsorption assembly corresponding to each battery cell and connected to the second driving device, the adsorption assembly comprising multiple adsorption elements, each adsorption element corresponding to the stress-bending bottom of the welding surface of the battery cell; and

[0026] The abutment structure located on both sides of the adsorption component includes a plurality of abutment members fixedly connected to the frame, and the abutment members correspond to the stress bending ends of the welding surfaces of the battery cells;

[0027] The second driving device can drive the adsorption member to move downward to adsorb the battery cell, and drive the adsorption member to lift the battery cell upward;

[0028] The abutting member abuts against the stress-bending end of the welding surface of the battery cell, and the adsorption member pulls up the stress-bending bottom of the welding surface of the battery cell, causing the battery cell to bend in the opposite direction. The height difference between the lower end of the abutting member and the lower end of the adsorption member is 0-10mm.

[0029] Furthermore, the second driving device includes an automatic telescopic rod fixedly connected to the frame and a mounting plate fixed to the lower end of the automatic telescopic rod, with the adsorption assembly fixed to the mounting plate.

[0030] Furthermore, at the junction of two of the battery cells, the number of abutment structures is one or two.

[0031] Furthermore, the abutment is a pressure bar or a buffer, and the pressure bar is parallel to the edge line of the stress-bending end of the battery cell welding surface.

[0032] Furthermore, multiple buffer components are sequentially fixed to the lower end of the pressure rod.

[0033] Furthermore, the bottom surface of the pressure rod is provided with a groove for the edge of the battery cell to be inserted.

[0034] Furthermore, the adsorption components in the adsorption assembly are arranged in one or more columns, and the columns of the adsorption components are parallel to the edge line of the stress-bending end of the battery cell welding surface.

[0035] In a second aspect, the present invention provides a battery string transport device for suspending and transporting a battery string from one station to the next station, the battery string comprising a plurality of battery cells connected by welding strips, and including a battery cell gripping and bending fixture as described in any of the preceding claims.

[0036] Furthermore, it also includes a cooling device that blows cooling air onto the battery cell when the battery cell gripping and bending fixture bends the battery cell.

[0037] Thirdly, the present invention provides a method for correcting battery cells, employing a battery cell gripping and reversing fixture as described in any of the preceding claims or a battery string transport device as described above, the method comprising the following steps:

[0038] Transfer and reverse bending: The battery cell gripping and reverse bending fixture suspends and transports the welded battery string to the next station. During the transport process, the battery cell gripping and reverse bending fixture bends the battery cells of the battery string in the opposite direction of the welding stress bending.

[0039] Release the battery string: The battery cell gripping and bending fixture moves to the next station and releases the battery string.

[0040] Furthermore, during the step of transferring and reversing the bending, cooling air is also blown onto the battery cells.

[0041] The beneficial effects achieved by this invention are:

[0042] The present invention relates to a battery cell gripping and reverse bending fixture. During the suspended transport of battery strings, the battery cells are bent in the opposite direction to the welding stress bending direction, maintaining this bend throughout the transport process. This counteracts the curling deformation caused by welding stress, ensuring that the released battery cells return to a flat surface upon reaching the next workstation, without affecting subsequent processing and manufacturing. By reverse bending the battery cells to an angle of 0° to 12.5° formed by sequentially passing through the two ends of the reverse bending line from the inflection point of the reverse bending line, the fixture ensures that the battery cells can be completely restored to a flat surface without damage. Because the reverse bending is performed during transport, it does not add extra time required for shaping and does not affect production efficiency. Since the present invention reverses the bending of the battery cells during suspended transfer, only the gripping mechanism of the battery string transport device needs to be modified; no new shaping equipment is required, no new floor space is added, and no additional time is spent handling deformation. Attached Figure Description

[0043] Figure 1 It is a 3D schematic diagram of a battery string;

[0044] Figure 2 This is a front view of the battery string;

[0045] Figure 3 This is a front view of the battery cell gripping and bending fixture provided in the first embodiment of the present invention bending the battery cell in the reverse direction;

[0046] Figure 4 This is a schematic diagram of the battery cell of the present invention after being bent in the reverse direction;

[0047] Figure 5 This is a schematic diagram of the overall structure of the battery cell gripping and bending fixture provided in the first embodiment of the present invention;

[0048] Figure 6 This is a schematic diagram of the overall structure from another angle provided in the first embodiment of the present invention;

[0049] Figure 7 yes Figure 6 Enlarged view of point A in the middle;

[0050] Figure 8 This is a three-dimensional structural diagram of the battery cell gripping and bending fixture provided in the second embodiment of the present invention, which bends the battery cell in the reverse direction.

[0051] Figure 9 This is a front view of the battery cell gripping and bending fixture provided in the second embodiment of the present invention bending the battery cell in the reverse direction;

[0052] Figure 10 This is a schematic diagram of the overall structure of the battery cell gripping and bending fixture provided in the third embodiment of the present invention;

[0053] Figure 11 This is a front view of the battery cell gripping and bending fixture provided in the fourth embodiment of the present invention;

[0054] Figure 12 This is a side view of the battery cell gripping and bending fixture provided in an embodiment of the present invention picking up battery strings on a welding platform;

[0055] Figure 13 This is a schematic diagram of the overall structure of the battery cell gripping and bending fixture provided in the fifth embodiment of the present invention;

[0056] Figure 14 This is a front view of the battery cell gripping and bending fixture provided in the sixth embodiment of the present invention;

[0057] Figure 15 This is a schematic diagram of the three-dimensional structure of the battery cell gripping and bending fixture provided in the seventh embodiment of the present invention, which bends the battery cell in the reverse direction.

[0058] Figure 16 This is a schematic diagram of the battery cell gripping and bending fixture provided in the seventh embodiment of the present invention for picking up battery strings and bending battery cells in the reverse direction;

[0059] Figure 17 This is a front view of the battery cell gripping and reverse bending tool provided in the eighth embodiment of the present invention;

[0060] Figure 18 This is a front view of the battery cell gripping and reverse bending tool provided in the ninth embodiment of the present invention;

[0061] Figure 19 This is a front view of the battery cell gripping and reverse bending tool provided in the tenth embodiment of the present invention;

[0062] Figure 20 This is a schematic diagram of the battery cell picking and bending fixture provided in the embodiment of the present invention, which picks up battery strings and bends battery cells in the reverse direction.

[0063] Figure 21 This is a flowchart of the battery cell correction method provided in an embodiment of the present invention.

[0064] Icon labels:

[0065] 1. Frame; 2. Adsorption assembly; 21. Adsorption component; 31. Pressing structure; 311. Pressing component; 3111. Pressing rod; 312. Guide rod; 313. Limiting component; 32. Abutting structure; 321. Abutting component; 3211. Pressing rod; 322. Connecting rod; 331. Groove; 332. Buffer component; 4. First driving device; 5. Second driving device; 51. Automatic telescopic rod; 52. Mounting plate; 6. Welding station; 61. Welding platform; 7. Welding inspection station; 8. Battery string; 81. Battery cell; 811. Battery cell welding surface; 812. Stress bending bottom; 813. Stress bending end; 82. Welding strip; O. Inflection point of the reverse bending line; P. One end of the reverse bending line; Q. The other end of the reverse bending line. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Furthermore, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0067] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0069] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0071] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0072] The battery cell gripping and bending fixture of the present invention bends the battery cells in the opposite direction of the welding stress bending direction during the suspended transport of battery strings, thereby offsetting the curling deformation caused by welding stress. This allows the released battery cells to return to flatness after reaching the next work station, without affecting subsequent processing and manufacturing.

[0073] Example 1

[0074] Reference Figure 3 and Figure 15This embodiment provides a battery cell gripping and reverse bending fixture, which is applied to a battery string 8 transport device. The battery string transport device suspends and transports the battery string 8 from one station to the next station. The battery string 8 includes multiple battery strings 8 connected by welding strips 82. During the transport of the battery string 8, the battery cell gripping and reverse bending fixture bends the battery cell 81 in the opposite direction of the welding stress bending. On the reverse bending line of the battery cell 81, the included angle formed by the inflection point O of the reverse bending line and the endpoints (P and Q) of the two reverse bending lines is 0° to 12.5°.

[0075] Reference Figure 1 and Figure 2 In general, during the production of back-contact batteries, the battery cell 81 is rectangular. When multiple battery cells 81 are arranged, they are sequentially arranged along the short side (i.e., the width of the rectangle). The welding ribbon 82 is perpendicular to the long side and parallel to the short side of the battery cell 81 on the upper surface of the battery cell 81. After welding, due to the different materials of the welding ribbon 82 and the battery cell 81, their shrinkage ratios are different. Furthermore, since it is a single-sided welding, the welding stress causes the battery cell 81 to bend towards the side with the welding ribbon 82. The two long sides of the battery cell 81 move upward and towards the middle, forming a concave curve with the opening facing upward.

[0076] In this invention, reference is made to Figure 20 After being connected to the battery string 8 transport device (e.g., the robotic arm of the battery string 8 transport device), the battery cell gripping and bending fixture can move suspended between two workstations, thus transporting the battery string 8 from one workstation to the next without touching the ground during the movement, and without occupying additional space. Specifically, one workstation is welding workstation 6, and the other workstation is the next workstation after welding is completed (e.g., welding inspection workstation 7, where EL checks the welding quality, and if there are no problems, it proceeds to the layout workstation; of course, this can be adjusted according to the actual process), that is, transporting the battery string 8 from welding workstation 6 to welding inspection workstation 7. It can be understood that the suspended transport of the battery cell gripping and bending fixture mentioned here can include up-and-down movement, left-and-right movement, and forward-and-backward movement.

[0077] Reference Figure 4 In this invention, during the transport of the battery string 8, the battery cell gripping and bending fixture bends the battery cell 81 in the opposite direction of the welding stress bending, causing the battery cell 81 to form a curve with an upward convex shape in the middle and the opening of the curve facing downward. In this invention, the shape curve of the battery cell 81 after being bent in the opposite direction is called the reverse bending line, and the position where the upward convex part of the reverse bending line changes from rising to falling is called the inflection point O of the reverse bending line.

[0078] To ensure that the battery cell 81 can return to flatness after being bent in the reverse direction, it needs to be bent in the reverse direction to a certain extent, but not excessively, which would prevent the battery cell 81 from returning to flatness or damage it. Specifically, in this invention, on the reverse bending line of the battery cell 81, the included angle ∠OPQ formed by sequentially passing through the endpoints (i.e., P and Q) of the two reverse bending lines starting from the inflection point O of the reverse bending line is 0° to 12.5°, specifically 3°, 5°, 8°, 10°, 11°, or 12°. The reverse bending fixture for gripping the battery cell can be set according to the actual degree of stress bending of the battery cell 81 to control the above-mentioned included angle after reverse bending, ensuring that the battery cell 81 can return to flatness after being released.

[0079] Reference Figure 6 The battery cell gripping and bending fixture is used to pick up the welded battery string 8, and then, during the suspended transfer process, bends the battery cell 81 in the opposite direction to the bending direction of the welding stress, that is, bends the battery cell 81 in the reverse direction. Understandably, the battery cell gripping and bending fixture can pick up the battery string 8, or it can put the battery string 8 down after reaching the next station. Specifically, the battery cell gripping and bending fixture can use a suction cup or mechanical gripper to pick up the battery string 8, and then use a corresponding lifting or pushing structure to lift the middle of the battery cell 81 or press down both ends of the battery cell 81, so that the battery cell 81 bends into a downward-opening curve.

[0080] Based on the above structure, this invention can bend the battery cell 81 in the opposite direction of welding stress bending during the transfer of the battery string 8 using the battery cell gripping and bending fixture. This reverse bending operation eliminates the deformation of the battery cell 81 caused by welding stress after welding, allowing the battery cell 81 to return to its flat state when it is placed down on the battery string 8 after reaching the welding inspection station 7. Furthermore, since this invention reverses the bending of the battery cell 81 after picking it up and during the suspended transfer process, only the gripping fixture of the existing battery string 8 transport device needs to be modified. No new shaping equipment is required, and no space is occupied in the factory. Moreover, since the operation occurs during the gripping and transfer process, there is no additional time spent processing deformation, and it does not affect product production efficiency.

[0081] Example 2

[0082] In this embodiment, refer to Figure 3 , Figure 5 and Figure 6 The battery cell gripping and reverse bending fixture includes:

[0083] Frame 1 that moves between two workstations;

[0084] Adsorption assembly 2, which is disposed on the frame 1 and corresponds one-to-one with the battery cell 81, includes multiple adsorption elements 21, each of which corresponds to the stress bending bottom 812 of the battery cell welding surface 811.

[0085] The pressing structure 31 is located on both sides of the adsorption component 2. The pressing structure 31 includes a plurality of pressing elements 311, which are retractably mounted on the frame 1.

[0086] The first driving device 4 that drives the pressing member 311 to press downward; and

[0087] The pressing member 311 presses the stress-bending end 813 of the welding surface 811 of the battery cell, causing the battery cell 81 to bend in the opposite direction, and the height difference between the lower end of the pressing member 311 and the lower end of the adsorption member 21 is 0-10mm.

[0088] Reference Figure 2 In this invention, the side of the battery cell 81 to which the welding strip 82 is welded is referred to as the battery cell welding surface 811. The cross-sectional shape of the battery cell 81 after bending due to the welding stress caused by the welding strip 82 is called the stress bending curve. The stress bending curve is concave in the middle and opens upwards; the concave part in the middle is called the stress bending bottom 812, and the two ends of the stress bending curve are called the stress bending ends 813. It should be noted that the stress bending bottom 812 and stress bending ends 813 are specific locations on the battery cell 81. Even if the battery cell 81 has been flattened or bent in the opposite direction to form a downward-opening curve, the stress bending bottom 812 and stress bending ends 813 still refer to the original locations on the battery cell 81 and will not disappear due to changes in the shape of the battery cell 81.

[0089] Reference Figure 3 and Figure 5 The frame 1 provides an installation location for the adsorption component 2 and the pressing mechanism. Specifically, the frame 1 can be a plate-like structure or a frame structure, as long as it can provide an installation location.

[0090] Reference Figure 3 and Figure 6The adsorption assembly 2 is installed at the bottom of the frame 1 and can contact the welded battery string 8 as the frame 1 moves. Each adsorption assembly 2 corresponds one-to-one with a battery cell 81. The adsorption assemblies 2 are arranged sequentially along the arrangement direction x of the battery string 8, allowing a whole battery string 8 to be adsorbed flatly at once, avoiding the tilting of the battery string 8 during transportation caused by adsorbing only one end of the battery string 8. The adsorption assembly 2 includes multiple adsorption elements 21, which can be suction cups. They are connected to a negative pressure source through pipelines, and the connection of the pipeline is controlled by a solenoid valve connected to the air pipe, thereby controlling the adsorption or release. The number of adsorption assemblies 2 corresponds one-to-one with the number of battery cells 81, so as to provide adsorption force to each battery cell 81. The multiple adsorption elements 21 in the adsorption assembly 2 are arranged in one or more rows and all adsorb the stress-bending bottom 812. By adsorbing the battery cells 81 together in rows, it is ensured that the battery cells 81 will not fall off when bending in the opposite direction.

[0091] In this embodiment, refer to Figure 3 The adsorption component 2 is fixedly connected to the frame 1, and the adsorption component 2 itself is not retractable. Of course, in order to perform adsorption safely, the adsorption component 2 can have a buffer structure with a certain stroke, but the stroke of the buffer structure will not affect the height relationship between the pressing part 311 and the lower end of the adsorption component 21.

[0092] The pressing structure 31 includes multiple pressing members 311, which are extendable and retractable, thereby changing the height difference between the lower end of the pressing member 311 and the lower end of the adsorption member 21. The shortening of the pressing member 311 can be automatic or under pressure. When the pressing member 311 extends, it is driven by the first driving device 4. Specifically, the pressing member 311 can press downward against the stress-bending end 813 of the battery cell welding surface 811 of the battery cell 81, and extend under the drive of the first driving device 4, applying downward pressure to create a height difference between the pressing member 311 and the lower end of the adsorption member 21, with the lower end of the adsorption member 21 being higher, causing the battery cell 81 to bend in the opposite direction.

[0093] When the battery cell 81 is bent in the reverse direction, the height difference between the lower end of the pressing member 311 and the lower end of the adsorption member 21 is 0-10mm. Within this range, the included angle of the battery cell 81 can be limited to the aforementioned range, ensuring that the battery cell 81 can return to flatness after being placed down. Specifically, the height difference between the lower end of the pressing member 311 and the lower end of the adsorption member 21 can be 1mm, 3mm, 5mm, 8mm, 10mm, etc.

[0094] In this embodiment, when the battery string 8 is adsorbed, the pressing member 311 can first abut against the battery cell 81 and shorten the distance between the pressing member 311 and the frame 1, so that the height difference between the pressing member 311 and the adsorption member 21 is reduced until the adsorption member 21 contacts the stress bending bottom 812 of the battery cell welding surface 811 of the battery cell 81, ensuring that the adsorption assembly 2 can adsorb the battery string 8 well without being disturbed by the pressing structure 31.

[0095] After the adsorption component 2 adsorbs the battery string 8, the frame 1 lifts the battery cell gripping and bending fixture. During the lifting and transfer process, the first drive device 4 drives the pressing component 311 to press downwards. The pressing component 311 extends, changing the height difference between the adsorption component 2 and the pressing structure 31, so that the lower end of the pressing structure 31 is lower than the lower end of the adsorption component 2. At this time, the stress-bending end 813 of the battery cell welding surface 811 is pressed downwards by the pressing component 311, thereby making the battery cell 81 become a downward-opening curve, thus achieving reverse bending of the battery cell 81, until it reaches the next station and is released, and the battery cell 81 is placed in the next station. Since the battery string 8 has been reverse-bent during the adsorption and transfer process, the deformation caused by welding stress is eliminated, and when it is placed in the next station, the battery cell 81 on the battery string 8 can return to flatness.

[0096] Example 3

[0097] In this embodiment, refer to Figure 3 and Figure 7 The pressing component 311 is fixedly connected to the guide rod 312. The upper end of the guide rod 312 is longitudinally slidably connected to the frame 1. The guide rod 312 is connected to the limit component 313 above the frame 1.

[0098] The first driving device 4 is an elastic element, with one end of the elastic element abutting against the frame 1 and the other end abutting against the pressing element 311;

[0099] When the adsorption member 21 descends to adsorb the battery cell 81, the pressing member 311 compresses the elastic member and shortens the length of the guide rod 312 extending downward.

[0100] Reference Figure 3 and Figure 7 The guide rod 312 slides longitudinally with the frame 1. This can be achieved by having longitudinal holes in the frame 1 or by installing linear bearings on the frame 1, allowing the guide rod 312 to slide longitudinally. The longitudinal sliding of the guide rod 312 guides the elastic force of the elastic element, ensuring it can drive the contact element to move longitudinally, thus pushing the battery cell 81 located below the pressing member 311 downwards. When the battery cell 81 is not adsorbed, the lower end of the pressing member 311 is lower than the adsorption assembly 2. After picking up the battery cell 81, the elastic element pushes both ends of the battery cell 81 downwards below the middle portion, thereby bending the battery cell 81 in the opposite direction.

[0101] Understandably, the longitudinal sliding of the guide rod 312 on the frame 1 is limited by a minimum point. At this point, the limiting member 313 abuts against the frame 1, preventing the guide rod 312 from sliding downwards and completely detaching from the frame 1 during natural suspension. Specifically, the limiting member 313 can be a limiting nut installed at the upper end of the guide rod 312. This limiting nut cannot pass through the longitudinal hole or linear bearing of the frame 1, thus limiting the guide rod 312 on the frame 1. That is, when the guide rod 312 slides downwards to the lowest point, the limiting member 313 abuts against the frame 1. The degree of reverse bending can be adjusted by changing the installation position of the limiting nut at the upper end of the guide rod 312, thereby changing the distance between the limiting member 313 and the frame 1.

[0102] Of course, when the guide rod 312 is at its lowest point, the battery cell 81 bends into a curve with the opening facing downwards. This does not exceed the limit of reverse bending of the battery cell 81 set by the present invention, so as not to damage the battery cell 81, nor to cause the battery cell 81 to bend too much in the reverse direction, thus preventing it from naturally flattening after being put down.

[0103] The position of the limiting member 313 on the guide rod 312 is adjustable so as to adjust the depth of the guide rod 312 after it is pressed down according to the stress bending degree of different types of battery cells 81, thereby adjusting the degree of reverse bending.

[0104] Reference Figure 3 , Figure 8 and Figure 9 The pressing member 311 is located at the lower end of the guide rod 312 and is in direct contact with the battery cell 81. It is designed to bend the battery cell 81 so that one end of the stress bending curve of the battery cell welding surface 811 moves together with it when the battery cell 81 is bent.

[0105] Referring to the figure, the elastic element pushes the pressing member 311 downwards. The elastic element can be located between the frame 1 and the pressing member 311, or between the frame 1 and the guide rod 312. The elastic element pushes the pressing member 311 downwards by pushing the guide rod 312 downwards. Specifically, the elastic element is a spring, which is fitted onto the guide rod 312. The upper and lower ends of the elastic element abut against the frame 1 and the pressing member 311 respectively. Furthermore, the elastic element is always in a compressed state, so that throughout the process, its elastic force causes the pressing member 311 to have a downward tendency to move.

[0106] Reference Figure 20In operation, the frame 1 carries the adsorption component 2 and the pressing structure 31 onto the welding platform 61, where the welded battery string 8 is laid flat. The frame 1 descends, and the pressing component 311 first abuts against the battery piece 81 and continues to shorten, compressing the elastic element until the lower end of the pressing component 311 is flush with the lower end of the adsorption component 2. At this point, the adsorption component 2 contacts and adsorbs and fixes the battery piece 81. Then, the frame 1 rises, and the pressing component 311 extends downward under the elastic force of the elastic element. The lower end of the pressing component 311 abuts against the end of the battery piece 81, and the lower end of the pressing component 311 is lower than the lower end of the battery piece 81, causing the battery piece 81 to bend into a curve with the opening facing downwards.

[0107] The frame 1 continues to move to the next station. During this movement, the lower end of the pressing component 311 continues to press the stress-bending end 813 of the battery cell 81 against the welding surface, keeping the battery cell 81 bent in the opposite direction to the welding stress bending direction (i.e., reverse bending), thus eliminating the influence of welding stress on the shape of the battery cell 81. Upon reaching the next station, the adsorption component 2 releases the battery string 8. At this point, due to the previous reverse bending, the bending deformation caused by the welding stress of the battery cell 81 has been eliminated. In the battery string 8 that is now placed down, the battery cell 81 can naturally flatten out without affecting subsequent operations on the battery string 8.

[0108] Example 4

[0109] Reference Figure 3 , Figures 9 to 11 The pressing element 311 is either a pressing rod 3111 or a buffer element 332. The pressing rod 3111 is parallel to the edge line of the stress bending end 813 of the battery cell welding surface 811.

[0110] Reference Figure 3 and Figure 9 When the pressing member 311 is a pressing rod 3111, there is one pressing rod 3111 in one abutment member 321. The length of the pressing rod 3111 is sufficient to press down one side of the battery cell 81 as a whole. Specifically, the pressing rod 3111 is strip-shaped and extends along the edge line of the stress bending end 813 parallel to the welding surface 811 of the battery cell.

[0111] The pressing rod 3111 is a structure that applies downward pressure to the raised edge of the battery cell 81 when it is bent in the opposite direction.

[0112] In this embodiment, refer to Figure 3 , Figure 9 and Figure 14 The pressing element 311 is configured as a pressing rod 3111, which can simultaneously apply downward pressure to the entire raised side of the battery cell 81, so that the entire side is pressed down, thereby deforming the whole and avoiding localized downward deformation, which would affect the correction effect.

[0113] When the pressing member 311 is a buffer member 332, there are multiple buffer members 332 arranged in a row, which together press down one side of the battery cell 81 as a whole. Correspondingly, the number of guide rods 312 or connecting rods 322 connected to the buffer member 332 can be the same as the number of buffer members 332. The buffer member 332 can be an elastic pad or a suction cup.

[0114] Reference Figure 13 In one embodiment, the buffer 332 is a suction cup, which can be activated or deactivated. If the adsorption assembly 2 is not secure and the battery string 8 falls off, the suction cup of the buffer 332 can be activated. If the adsorption assembly 2 is secure and the battery string 8 does not fall off, the suction cup of the buffer 332 is not activated; its softness is used only for cushioning when it comes into contact with the battery cell 81.

[0115] Example 5

[0116] In this embodiment, refer to Figure 10 and Figure 11 Multiple buffer components 332 are fixed sequentially at the lower end of the pressing rod 3111.

[0117] In this embodiment, the pressing rod 3111 serves as a mounting base for the buffer 332. The buffer 332 is installed at the bottom of the pressing rod 3111 and abuts against the battery cell 81 during use. In other words, a buffer 332 is added between the battery cell 81 and the pressing rod 3111 as a buffering and protective structure to prevent damage to the battery cell 81 from excessive pressure applied by the pressing rod 3111.

[0118] The number of buffers 332 is at least three, and they are evenly arranged on the pressing rod 3111.

[0119] Specifically, the buffer 332 can be an elastic pad, such as a rubber block, silicone block, etc.

[0120] In a preferred embodiment, refer to Figure 10 and Figure 11 The buffer 332 is a suction cup, which is installed at the bottom of the pressing rod 3111 as a buffer. With this structural design, the suction cup can be used without activation, only for its buffering function. Alternatively, the suction cup can be activated for activation as needed to ensure that the battery cell 81 is transported smoothly and securely during handling, and that the battery string 8 will not fall off during handling and reverse bending.

[0121] Example 6

[0122] Reference Figure 5 , Figure 7 , Figure 12The bottom surface of the pressing rod 3111 is provided with a groove 331 for the edge of the battery piece 81 to be inserted.

[0123] Reference Figure 5 , Figure 7 , Figure 12 In this embodiment, the bottom of the pressing rod 3111 does not have a buffer 332. To prevent the pressing rod 3111 from damaging the battery cell 81 when the battery cell gripping and bending fixture descends to the welding platform 61 to grip the battery string 8, the groove 331 is provided at the bottom of the pressing rod 3111. This groove allows the edge of the battery cell 81 to be inserted. When the pressing rod 3111 descends to the welding platform 61, the bottom surface of the pressing rod 3111 does not directly press against the edge of the battery cell 81. Instead, the pressing rod 3111 presses against the welding platform 61, and the welding platform 61 bears the weight of the pressing rod 3111. The edge of the battery cell 81 is inserted into the groove 331, so the battery cell 81 is not compressed and is not damaged.

[0124] Understandably, the shape of the groove 331 is adapted to the shape of the edge of the battery cell 81, so that when the pressing rod 3111 is pressed on the welding platform 61, the battery cell 81 will not be directly pressed between the pressing rod 3111 and the welding platform 61.

[0125] Example 7

[0126] Reference Figure 3 , Figure 9 , Figure 11 , Figure 13 and Figure 14 At the junction of two battery cells 81, the number of pressing structures 31 is one or two.

[0127] Understandably, the battery string 8 is connected by welding at least two battery cells 81 together with solder strips 82. Therefore, in order to bend all the battery cells 81 in the opposite direction, at least three corresponding pressing structures 31 are required.

[0128] In this embodiment, there is one pressing structure 31 at the junction of two adjacent battery cells 81. If there are two battery cells 81 in the battery string 8, then three pressing structures 31 are required. The three pressing structures 31 are arranged in a row, with the two pressing structures 31 at the beginning and end aligned with the ends of the two battery cells 81 that are far apart, and the pressing structure 31 in the middle aligned with the ends of the two battery cells 81 that are close together. (Refer to...) Figure 3That is, at the joint where two battery cells 81 are close to each other, a pressing structure 31 simultaneously presses down on this end of both battery cells 81. Similarly, if there are three battery cells 81 in the battery string 8, four pressing structures 31 are needed; if there are four battery cells 81 in the battery string 8, five pressing structures 31 are needed. When the number of battery cells 81 is N (N is greater than or equal to 2), the number of pressing structures 31 is N+1.

[0129] In another embodiment, there is one pressing structure 31 at the junction of two adjacent battery cells 81. If there are two battery cells 81 in the battery string 8, then four pressing structures 31 are required. The four pressing structures 31 are arranged in a row, with the two pressing structures 31 at the beginning and end aligning with the ends of the two battery cells 81 that are far apart from each other (i.e., the stress bending end 813 of the battery cell welding surface 811). Figure 9 , Figure 11 , Figure 13 and Figure 14 In the middle position, two pressing structures 31 are used to align the ends of two adjacent battery cells 81. In this case, the string of two battery cells 81 requires four pressing structures 31. Therefore, if there are three battery cells 81 in the string 8, six pressing structures 31 are needed; if there are four battery cells 81 in the string 8, eight pressing structures 31 are needed. That is, two pressing structures 31 are needed at adjacent positions, and one pressing structure 31 is needed at each end. In other words, each end of each battery cell 81 requires one pressing structure 31. When the number of battery cells 81 is N (N is greater than or equal to 2), the number of pressing structures 31 is 2N.

[0130] Example 8

[0131] In this embodiment, refer to Figures 15 to 19 The battery cell gripping and reverse bending fixture includes:

[0132] Frame 1 that moves between two workstations;

[0133] The second drive device 5 is fixed on the frame 1;

[0134] An adsorption assembly 2, corresponding one-to-one with the battery cell 81 and connected to the second driving device 5, includes multiple adsorption elements 21, each adsorption element 21 corresponding to the stress-bending bottom 812 of the battery cell welding surface 811; and

[0135] The abutment structure 32 is located on both sides of the adsorption component 2. The abutment structure 32 includes a plurality of abutment members 321 that are fixedly connected to the frame 1. The abutment members 321 correspond to the stress bending end 813 of the battery cell welding surface 811.

[0136] The second driving device 5 can drive the adsorption member 21 to move downward to adsorb the battery cell 81, and drive the adsorption member 21 to lift the battery cell 81 upward.

[0137] The abutting member 321 abuts against the stress-bending end 813 of the battery cell welding surface 811, and the adsorption member 21 pulls up the stress-bending bottom 812 of the battery cell welding surface 811, causing the battery cell 81 to bend in the opposite direction. The height difference between the lower end of the abutting member 321 and the lower end of the adsorption member 21 is 0-10mm.

[0138] Reference Figure 15 The frame 1 provides an installation location for the abutment structure 32 and the second drive device 5. Specifically, the frame 1 can be a plate-like structure or a frame structure, as long as it can provide an installation location.

[0139] In this embodiment, the adsorption component 2 is connected to the second driving device 5 and is driven by the second driving device 5 to move up and down. It can descend to adsorb the battery cell 81, and it can also rise to lift the stress-bent bottom 812 of the battery cell welding surface 811. When lifting, the stress-bent end 813 of the battery cell welding surface 811 is abutted by the abutment member 321 and cannot rise, thereby bending the battery cell 81 in the opposite direction.

[0140] The number of second driving devices 5 can be one or more. One second driving device 5 can be used to drive multiple adsorption components 2 to move up and down simultaneously, or the number of second driving devices 5 can be set to correspond one-to-one with the number of adsorption components 2, with each second driving device 5 driving one adsorption component 2 to move up and down.

[0141] Reference Figure 15 and Figure 16 The adsorption component 2 is connected to the frame 1 via a second driving device 5. The adsorption component 2 is fixed to the lower end of the second driving device 5, and the other end of the second driving device 5 is connected to the frame 1. The second driving device 5 can extend and retract, thereby changing the relative height between the adsorption component 2 and the abutment structure 32.

[0142] When the battery string 8 is adsorbed on the welding platform 61, the frame 1 descends, and the second drive device 5 drives the adsorption component 2 to extend downwards until it is flush with the abutment structure 32, so that the adsorption component 2 contacts the battery cell 81 and adsorbs and fixes the battery cell 81. The frame 1 rises, and the battery string 8 leaves the welding platform 61. At this time, the second drive device 5 shortens, and the stress-bending end 813 of the welding surface 811 of the battery cell abuts the abutment structure 32. The second drive device 5 continues to shorten, and the lower end of the adsorption component 2 is higher than the abutment structure 32. At this time, the battery cell 81 bends, forming a downward-opening curve. That is, at this time, the battery cell 81 has bent in the opposite direction to the welding stress bending direction. The second drive device 5 maintains this length and maintains this deformation until it reaches the next station.

[0143] Example 9

[0144] In this embodiment, refer to Figure 16 The second drive device 5 includes an automatic telescopic rod 51 fixedly connected to the frame 1 and a mounting plate 52 fixed to the lower end of the automatic telescopic rod 51. The adsorption component 2 is fixed on the mounting plate 52.

[0145] In this embodiment, the upper end of the automatic telescopic rod 51 is fixedly connected to the frame 1, the mounting plate 52 is fixed to the lower end of the telescopic automatic telescopic rod 51, and the adsorption assembly 2 is fixed on the mounting plate 52. The mounting plate 52 extends along the short side of the battery cell 81, and each adsorption component 21 of the adsorption assembly 2 is also arranged and fixed on the bottom surface of the mounting plate 52 along the short side of the battery cell 81 to simultaneously adsorb the stress-bending bottom 812 of the welding surface 811 of the battery cell. The telescopic rod 51 extends and retracts, which can change the relative height between the adsorption structure and the abutment structure 32.

[0146] Reference Figure 16 When the battery string 8 is adsorbed on the welding platform 61, the frame 1 descends, and the automatic telescopic rod 51 extends downward to be flush with the abutment structure 32, so that the adsorption component 2 contacts the battery cell 81 and adsorbs and fixes the battery cell 81. The frame 1 rises, and the battery string 8 leaves the welding platform 61. At this time, the automatic telescopic rod 51 shortens, and the battery cell 81 abuts against the abutment structure 32. The automatic telescopic rod 51 continues to shorten, and the lower end of the adsorption structure is higher than the abutment structure 32. At this time, the battery cell 81 bends, forming an arc shape with the opening facing downward. That is, at this time, the battery cell 81 has bent in the opposite direction to the bending direction of the welding stress. The automatic telescopic rod 51 maintains this length and maintains this deformation until it reaches the next station.

[0147] Specifically, refer to Figure 15 The automatic telescopic rod 51 can be a cylinder or a linear motor.

[0148] Example 10

[0149] Reference Figure 17 , Figure 18 and Figure 19 At the junction of two battery cells 81, the number of abutment structures 32 is one or two.

[0150] Understandably, the battery string 8 is connected by welding at least two battery cells 81 together with solder strips 82. Therefore, in order to bend all the battery cells 81 in the opposite direction, at least three corresponding abutment structures 32 are required.

[0151] Reference Figure 17In this embodiment, one abutment structure 32 is used at the junction of two adjacent battery cells 81. If there are two battery cells 81 in the battery string 8, three abutment structures 32 are required. The three abutment structures 32 are arranged in a row, with the two abutment structures 32 at the beginning and end aligned with the ends of the two battery cells 81 that are far apart, and the middle abutment structure 32 can be aligned with the ends of the two battery cells 81 that are close together. (Refer to...) Figure 17 That is, at the joint where two battery cells 81 are close to each other, abutting structure 32 simultaneously presses down on this end of both battery cells 81. Similarly, if there are three battery cells 81 in the battery string 8, four abutting structures 32 are needed; if there are four battery cells 81 in the battery string 8, five abutting structures 32 are needed. When the number of battery cells 81 is N (N is greater than or equal to 2), the number of abutting structures 32 is N+1.

[0152] In another embodiment, one abutment structure 32 is used at the junction of two adjacent battery cells 81. If there are two battery cells 81 in the battery string 8, four abutment structures 32 are required. The four abutment structures 32 are arranged in a row, with the first and last two abutment structures 32 aligned with the ends of the two battery cells 81 that are furthest from each other (i.e., the stress-bending ends 813 of the battery cell welding surfaces 811). See reference. Figure 18 , Figure 19 In the middle position, two abutment structures 32 are used to align the ends of two adjacent battery cells 81. In this case, the string of two battery cells 81 requires four abutment structures 32. Therefore, if there are three battery cells 81 in the string 8, six abutment structures 32 are needed; if there are four battery cells 81 in the string 8, eight abutment structures 32 are needed. That is, adjacent positions require two abutment structures 32, while the beginning and end each require one abutment structure 32. In other words, each end of each battery cell 81 requires one abutment structure 32. When the number of battery cells 81 is N (N is greater than or equal to 2), the number of abutment structures 32 is 2N.

[0153] Example 11

[0154] Reference Figures 17 to 19 The abutment 321 is either a pressing rod 3211 or a buffer 332, with the pressing rod 3211 parallel to the edge line of the stress bending end 813 of the battery cell welding surface 811.

[0155] When the abutment 321 is a pressing rod 3211, there is one pressing rod 3211 in one abutment 321. The length of the pressing rod 3211 is sufficient to press down one side of the battery cell 81 as a whole. Specifically, the pressing rod 3211 is strip-shaped and extends along the edge line of the stress bending end 813 parallel to the welding surface 811 of the battery cell.

[0156] The pressure bar 3211 is a structure that applies downward pressure to the raised edge of the battery cell 81 when it is bent in the opposite direction.

[0157] In this embodiment, refer to Figure 17 The abutment member 321 includes a connecting rod 322 fixedly connected to the frame 1 and an abutment member 321 fixed to the lower end of the connecting rod 322. In this embodiment, the abutment member 321 is fixed to the frame 1 and does not perform telescopic movement. Therefore, it is only necessary to connect and fix the abutment member 321 and the frame 1 with the connecting rod 322. The number of connecting rods 322 can be one or more.

[0158] The abutment 321 is the part that directly contacts the battery cell 81. It can be in surface contact with the battery cell 81 or it can be set to multi-point contact, as long as it can press down the outer end of the battery cell 81 (i.e., one end of the stress bending curve of the battery cell welding surface 811) as a whole.

[0159] In this embodiment, refer to Figure 17 The abutment 321 is configured as a pressing rod 3211, which can simultaneously apply downward pressure to the entire raised side of the battery cell 81, so that the entire side is pressed down, thereby deforming the whole and avoiding localized downward deformation, which would affect the correction effect.

[0160] When the abutment 321 is a buffer 332, there are multiple buffers 332 arranged in a row, which together press down one side of the battery cell 81. Correspondingly, the number of guide rods 312 or connecting rods 322 connected to the buffer 332 can be the same as the number of buffers 332. The buffer 332 can be an elastic pad or a suction cup.

[0161] Reference Figure 18 In one embodiment, the buffer 332 is a suction cup, which can be activated or deactivated. If the adsorption assembly 2 is not secure and the battery string 8 falls off, the suction cup of the buffer 332 can be activated. If the adsorption assembly 2 is secure and the battery string 8 does not fall off, the suction cup of the buffer 332 is not activated; its softness is used only for cushioning when it comes into contact with the battery cell 81.

[0162] Example 12

[0163] In this embodiment, refer to Figure 19 Multiple buffer components 332 are fixed sequentially at the lower end of the pressure bar 3211.

[0164] In this embodiment, the pressure bar 3211 serves as a mounting base for the buffer 332. The buffer 332 is installed at the bottom of the pressure bar 3211 and abuts against the battery cell 81 during use. In other words, a buffer 332 is added between the battery cell 81 and the pressure bar 3211 as a buffering and protective structure to prevent damage to the battery cell 81 from the excessively stiff pressure bar 3211 when pressure is applied.

[0165] The number of buffers 332 is at least three, and they are evenly arranged on the pressure bar 3211.

[0166] Specifically, the buffer 332 can be an elastic pad, such as a rubber block, silicone block, etc.

[0167] In a preferred embodiment, refer to Figure 19 The buffer 332 is a suction cup, which is installed at the bottom of the pressure rod 3211 to act as a buffer. With this structural design, the suction cup can be used without activation, only for its buffering function. Alternatively, the suction cup can be activated to ensure that the battery cell 81 is transported smoothly and securely during handling, and that the battery string 8 will not fall off during handling and reverse bending.

[0168] Example 13

[0169] Reference Figure 15 The bottom surface of the pressure rod 3211 is provided with a groove 331 for the edge of the battery cell 81 to be inserted.

[0170] Reference Figure 15 In this embodiment, the bottom of the pressure rod 3211 does not have a buffer 332. To prevent the pressure rod 3211 from damaging the battery cell 81 when the battery cell gripping and bending fixture descends to the welding platform 61 to grip the battery string 8, the groove 331 is provided at the bottom of the pressure rod 3211. This groove allows the edge of the battery cell 81 to be inserted into the groove. When the pressure rod 3211 descends to the welding platform 61, the bottom surface of the pressure rod 3211 does not directly press against the edge of the battery cell 81. Instead, the pressure rod 3211 presses against the welding platform 61, and the welding platform 61 bears the weight of the pressure rod 3211. The edge of the battery cell 81 is inserted into the groove 331, so the battery cell 81 is not compressed and is not damaged.

[0171] Understandably, the shape of the groove 331 is adapted to the shape of the edge of the battery cell 81, so that after the pressing rod 3211 presses on the welding platform 61, the battery cell 81 will not be directly pressed between the pressing rod 3211 and the welding platform 61.

[0172] Example 14

[0173] In this embodiment, refer to Figure 6 , Figure 10 , Figure 13 and Figure 15 In the adsorption assembly 2, multiple adsorbents 21 are arranged in one or more columns, and the columns of adsorbents 21 are parallel to the edge line of the stress bending end 813 of the battery cell welding surface 811.

[0174] In an adsorption component 2, there are multiple adsorption elements 21, which are arranged in one or more rows. These adsorption elements 21 simultaneously adsorb the stress-bending bottom 812 of the battery cell welding surface 811. By adsorbing the battery cell 81 with multiple adsorption elements 21, the adsorption force on the battery cell 81 is increased, making the battery cell 81 more stable when transporting and bending it in the opposite direction.

[0175] In one embodiment, refer to Figure 6 An adsorption component 2 contains only one row of adsorption elements 21, and each row includes multiple adsorption elements 21 spaced apart.

[0176] In another embodiment, refer to Figure 10 , Figure 13 and Figure 15 An adsorption component 2 includes two rows of adsorption elements 21, each row including multiple adsorption elements 21 spaced apart, the two rows of adsorption elements 21 are arranged side by side, and both adsorb on the middle of the battery cell 81.

[0177] Specifically, the adsorption element 21 is a suction cup.

[0178] Example 15

[0179] A battery string 8 transport device is provided to transport a battery string 8 from one station to the next station in a suspended manner. The battery string 8 includes multiple battery strings 8 connected by welding strips 82, and includes the battery cell gripping and bending fixture as in any of the above embodiments.

[0180] Most of the structure of the battery string 8 transport device can adopt existing transport mechanisms. The battery cell gripping and bending fixture is installed on its moving part (such as the end of a robotic arm). The moving part drives the battery cell gripping and bending fixture to move between two workstations, and it can also move up and down.

[0181] Example 16

[0182] Reference Figure 20 In this embodiment, the battery string 8 conveying device also includes a cooling device that blows cooling air onto the battery cell 81 when the battery cell gripping and bending fixture bends the battery cell 81.

[0183] After welding, residual heat remains in the battery cell 81, causing the overall temperature to rise. When bending the battery cell 81 in the reverse direction, if the cooling device blows air onto the battery cell 81 to cool it, the time required for the battery cell 81 to be held up can be further shortened, improving the applicability of this battery string 8 transport device. It can adapt to more and more compact equipment layouts, meaning that the transport distance and transport time between the first and second stations can be shortened.

[0184] The cooling device can be a fan to generate cooling air. Alternatively, air pipes and air outlets can be arranged on the battery string 8 transport device to blow air onto the battery cells 81 for cooling.

[0185] In one embodiment, without air blowing on the battery cell 81, it takes 6 seconds for the battery cell 81 to be released from reverse bending to ensure the overall deformation correction effect. However, by blowing air to cool the battery cell 81 during handling and reverse bending, this time can be shortened to 4 seconds, reducing the overall handling time by 1 / 3 and greatly improving efficiency.

[0186] Example 17

[0187] Reference Figure 21 This embodiment is a method for correcting the welding bending of battery cell 81. It uses the battery cell 81 gripping and anti-bending fixture of any of the above embodiments or the battery string 8 conveying device as described above. The method includes the following steps:

[0188] S1. Transfer and reverse bending: The battery cell gripping and reverse bending fixture suspends and transports the welded battery string 8 to the next station. During the transport process, the battery cell gripping and reverse bending fixture bends the battery cells 81 of the battery string 8 in the opposite direction of the welding stress bending.

[0189] In the production process of back-contact batteries, multiple battery cells 81 are arranged in a string and welded together using solder ribbons 82. Before welding, the battery cells 81 are arranged flat on the welding platform 61, with their upper surfaces being the surfaces to be welded. Multiple solder ribbons 82 are pressed onto the battery cells 81, and adjacent battery cells 81 are connected by multiple solder ribbons 82.

[0190] In this step, the battery cells 81 are connected to form a battery string 8 after being welded together by the welding ribbon 82. After welding is completed, the battery cell gripping and bending fixture picks up the battery cells 81 and transfers them to the next station. During the handling process after picking up, the battery cell gripping and bending fixture bends the battery cells 81 of the battery string 8 in the opposite direction to the bending caused by welding stress, i.e., reverse bending, so that the battery cells 81 bend into a curve with an opening facing downwards, in order to counteract the deformation bending caused by welding stress and eliminate stress. In this way, the battery cells 81 can be restored to a flat state after being placed down.

[0191] During the process of moving from welding station 6 to the next station, the solar cell 81 is kept bent in the opposite direction to ensure the correction effect of the solar cell 81, so that the solar cell 81 can eliminate the curling caused by welding stress.

[0192] During the handling and reverse bending of the battery cell 81, the shape after reverse bending is maintained to ensure complete elimination of welding stress. The duration of maintenance after reverse bending is the handling time in the two stations, ranging from 1 second to 20 seconds. Specifically, the battery cell 8131 is maintained for 3 seconds, 5 seconds, 7 seconds, 9 seconds, 10 seconds, 15 seconds, 17 seconds, or 19 seconds after bending, which can be adjusted according to the actual handling situation. In a preferred embodiment, the battery cell 8131 is maintained for 6 seconds after bending.

[0193] S2. Release battery string 8: The battery cell grabbing and bending fixture moves to the next station and puts down battery string 8.

[0194] After the battery cell grabbing and bending fixture picks up battery cell 81, it moves to the next workstation, maintaining the reverse bending motion of battery cell 81 until it reaches the workstation. First, the force previously applied to bend battery cell 81 is removed, allowing battery cell 81 to return to a flat state. Then, the battery string 8 is placed in the designated position at the workstation for further processing.

[0195] Understandably, after the battery string 8 is placed in the next station, the battery cell grabbing and bending fixture returns to the welding station 6, and the above steps S1 and S2 are repeated.

[0196] This invention counteracts the curling deformation caused by welding stress by bending the battery cell 81 in the opposite direction to the welding stress bending direction during the picking and transfer process. This allows the released battery cell 81 to return to its flat state upon reaching the next workstation, without affecting subsequent processing and manufacturing. Furthermore, since this invention performs reverse bending of the battery cell 81 during the picking and transfer process, only modifications to the battery cell picking and reverse bending fixture are required. No new shaping equipment is needed, and no factory space is occupied. Moreover, since the operation occurs during the picking and transfer process, there is no additional time spent handling deformation, and it does not affect product production efficiency.

[0197] Example 18

[0198] In this embodiment, during the step of transferring and bending in the reverse direction, cooling air is also blown onto the battery cell 81.

[0199] After welding, residual heat remains in the solar cell 81, causing the overall temperature to rise. When bending the solar cell 81 in the opposite direction, blowing air towards it for cooling can further shorten the time required to maintain the solar cell 81, improving the applicability of this method and enabling it to adapt to more compact equipment layouts (i.e., the transport distance between the first and second workstations can be shortened).

[0200] Cooling the solar cell 81 can be achieved by blowing air onto it using a fan to create a cooling airflow. Alternatively, air pipes and outlets can be installed on the conveying mechanism to blow air onto the solar cell 81 for cooling.

[0201] In one embodiment, without air blowing on the solar cell 81, it takes 6 seconds for the solar cell 81 to be released from reverse bending to ensure the overall deformation correction effect. However, by blowing air to cool the solar cell 81 during handling, reverse bending, and holding, this time can be reduced to 4 seconds, and the overall handling time can be reduced by 1 / 3, greatly improving efficiency.

[0202] In the description of this specification, references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the described embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0203] Furthermore, the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery cell gripping and reversing fixture, applied to a battery string transport device, the battery string transport device suspending and transporting a battery string from one station to the next station, the battery string comprising multiple battery cells connected by welding strips, characterized in that... During the transport of the battery string, the battery cell gripping and bending fixture bends the battery cell in the opposite direction of the welding stress bending. On the reverse bending line of the battery cell, the included angle formed by the two endpoints of the reverse bending line starting from the inflection point of the reverse bending line is 0° to 12.5°.

2. The battery cell gripping and reverse bending fixture according to claim 1, characterized in that, The battery cell gripping and reverse bending fixture includes: A frame that moves between two workstations; An adsorption assembly is provided on the frame, corresponding one-to-one with the battery cell. The adsorption assembly includes multiple adsorption elements, each of which corresponds to the stress-bending bottom of the welding surface of the battery cell. The pressing structures are located on both sides of the adsorption assembly, and each pressing structure includes a plurality of pressing elements, which are retractably mounted on the frame. A first driving device that drives the pressing member to press downwards; and The pressing member presses the stress-bending end of the welding surface of the battery cell, causing the battery cell to bend in the opposite direction, and the height difference between the lower end of the pressing member and the lower end of the adsorption member is 0-10mm.

3. The battery cell gripping and reverse bending fixture according to claim 2, characterized in that, The pressing component is fixedly connected to a guide rod, the upper end of which is slidably connected to the frame in the longitudinal direction, and a limiting component is connected to the guide rod above the frame. The first driving device is an elastic element, one end of which abuts against the frame and the other end of which abuts against the pressing element; When the adsorption member descends to adsorb the battery cell, the pressing member compresses the elastic member and shortens the length of the guide rod extending downward.

4. The battery cell gripping and reverse bending fixture according to claim 3, characterized in that, The pressing component is a pressing rod or a buffer component, and the pressing rod is parallel to the edge line of the stress bending end of the battery cell welding surface.

5. The battery cell gripping and reverse bending fixture according to claim 3, characterized in that, The pressing component includes a pressing rod and a buffer component, and a plurality of buffer components are fixed to the lower end of the pressing rod in sequence.

6. The battery cell gripping and reverse bending fixture according to claim 4, characterized in that, The bottom surface of the pressing rod has a groove for the edge of the battery cell to be inserted.

7. The battery cell gripping and reverse bending fixture according to claim 2, characterized in that, At the junction of two of the battery cells, the number of pressing structures is one or two.

8. The battery cell gripping and reverse bending fixture according to claim 1, characterized in that, The battery cell gripping and reverse bending fixture includes: A frame that moves between two workstations; A second drive unit fixed to the frame; An adsorption assembly corresponding to each battery cell and connected to the second driving device, the adsorption assembly comprising multiple adsorption elements, each adsorption element corresponding to the stress-bending bottom of the welding surface of the battery cell; and The abutment structure located on both sides of the adsorption component includes a plurality of abutment members fixedly connected to the frame, and the abutment members correspond to the stress bending ends of the welding surfaces of the battery cells; The second driving device can drive the adsorption member to move downward to adsorb the battery cell, and drive the adsorption member to lift the battery cell upward; The abutting member abuts against the stress-bending end of the welding surface of the battery cell, and the adsorption member pulls up the stress-bending bottom of the welding surface of the battery cell, causing the battery cell to bend in the opposite direction. The height difference between the lower end of the abutting member and the lower end of the adsorption member is 0-10mm.

9. The battery cell gripping and reverse bending fixture according to claim 8, characterized in that, The second driving device includes an automatic telescopic rod fixedly connected to the frame and a mounting plate fixed to the lower end of the automatic telescopic rod, with the adsorption assembly fixed to the mounting plate.

10. The battery cell gripping and reverse bending fixture according to claim 8, characterized in that, At the junction of two of the battery cells, the number of abutment structures is one or two.

11. The battery cell gripping and reverse bending fixture according to claim 8, characterized in that, The abutting member is a pressing rod or a buffer member, and the pressing rod is parallel to the edge line of the stress bending end of the battery cell welding surface.

12. The battery cell gripping and reverse bending fixture according to claim 8, characterized in that, The abutting member includes a pressing rod and a buffer member, and a plurality of buffer members are fixed to the lower end of the pressing rod in sequence.

13. The battery cell gripping and reverse bending fixture according to claim 11, characterized in that, The bottom surface of the pressure rod is provided with a groove for the edge of the battery cell to be inserted.

14. The battery cell gripping and reverse bending fixture according to claim 2 or 8, characterized in that, The adsorption assembly consists of multiple adsorption elements arranged in one or more columns, with the columns of the adsorption elements parallel to the edge line of the stress-bending end of the battery cell welding surface.

15. A battery string transport device for suspending and transporting a battery string from one station to the next station, the battery string comprising multiple battery cells connected by solder strips, characterized in that... Including the battery cell gripping and reverse bending fixture as described in any one of claims 1 to 14.

16. The battery string transport device according to claim 15, characterized in that, It also includes a cooling device that blows cooling air onto the battery cell when the battery cell gripping and bending fixture bends the battery cell.

17. A method for correcting battery cells, characterized in that, The method, employing the battery cell gripping and bending fixture as described in any one of claims 1 to 14 or the battery string transport device as described in claim 15 or 16, comprises the following steps: Transfer and reverse bending: The battery cell gripping and reverse bending fixture suspends and transports the welded battery string to the next station. During the transport process, the battery cell gripping and reverse bending fixture bends the battery cells of the battery string in the opposite direction of the welding stress bending. Release the battery string: The battery cell gripping and bending fixture moves to the next station and releases the battery string.

18. The method for correcting battery cells according to claim 17, characterized in that, During the transfer and reverse bending step, cooling air is also blown onto the battery cell.

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