A method and device for correcting battery string

Abstract

The present invention discloses a method and device for correcting a battery string, relating to the technical field of battery string production. The method comprises: pressing a plurality of battery cells in a battery string one by one so that at least one end of the battery string extends along the length direction of the battery string; and applying a force F in the opposite direction to the first direction to the surface of the battery cell bent in the first direction in the welded battery string, so that the pressed battery cells one by one extend in turn in the length direction of the battery string on the side not pressed. The applied force F causes the middle of the battery cell to extend toward the side where the welding strip is laid. By precisely controlling the magnitude and direction of the force F, the curvature of the battery cell is adjusted to a preset range, ensuring the overall flatness of the battery string, thereby improving the stability and service life of the battery string and reducing the risk of hidden cracks and breakage of the battery cell due to bending.

Description

Technical Field

[0001] The present invention relates to the technical field of battery string production, and in particular to a method for correcting a battery string and a string making device. Background Art

[0002] The back contact of a BC battery means that both the emitter electrode and the base electrode are located on the back. On the one hand, the back contact battery structure transfers the emitter electrode to the back of the battery, thereby reducing or eliminating the shading loss of the front grid line and improving battery efficiency; on the other hand, it is easy to assemble during component packaging. Since all the electrodes are on the back, the spacing between battery cells can be reduced, the packaging density can be increased, and the appearance is beautiful.

[0003] Back-contact solar cells are connected in series via solder ribbons, which are interlaced and interconnected on the backs of all the cells. Because the ribbons are fixed to the cell surfaces through heating and welding, they are prone to thermal stress during heating. Once the cell string cools down, the ribbons exert tensile stress on the cells, causing them to bend and deform toward the side without the ribbon. This shortens the cell string, failing to meet the standard length for photovoltaic modules. Furthermore, the ribbons connecting the cells in the string can bend, causing the cell edges to overlap and the string to be uneven. This can lead to cell breakage or cracking during lamination after the cell string is laid out, reducing the production quality of solar modules. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a method for correcting a battery string and a string making device.

[0005] In a first aspect, the present application provides a method for correcting a battery string, comprising:

[0006] Pressing the multiple battery cells in the battery string one by one so that the battery string extends in its length direction;

[0007] A force F in the opposite direction to the first direction is applied to the surface of the battery cell bent in the first direction in the battery string after welding, so that the middle of the battery cell stretches toward the side where the welding ribbon is laid.

[0008] Furthermore, the battery string extending in its length direction includes extending from the middle of the battery string to both ends or extending from one end of the battery string to the other end.

[0009] Furthermore, pressing the multiple battery cells in the battery string one by one includes continuously pressing each battery cell one by one along the length direction of the battery string, or pressing some of the battery cells in the battery string at intervals.

[0010] Furthermore, the curvature of the battery cell gradually decreases from the first curvature K to zero; or, after the curvature of the battery cell gradually decreases from the first curvature K to zero, it continues to bend in the opposite direction of the first direction to a second curvature K1.

[0011] Furthermore, pressing the multiple battery cells in the battery string one by one includes: using pressing members of different heights to contact each battery cell one by one and press them to the same receiving plane.

[0012] Furthermore, pressing the multiple battery cells in the battery string one by one includes: passing each battery cell in the battery string through a recessed portion in turn, and the recessed portion is recessed in a direction opposite to the first direction.

[0013] Furthermore, while applying the force F, the battery cell is heated.

[0014] On the second aspect, based on any of the above-mentioned methods for correcting a battery string, the present application proposes a device for correcting a battery string, comprising a pressure member, a bearing member and a positioning member, wherein the bearing member is used to support the battery string, the positioning member is used to position at least two sides of the battery cells in the battery string that are bent in a first direction, and the pressure member is used to apply a force F in the opposite direction to the first direction to the surface of the battery cell that is bent in the first direction.

[0015] Furthermore, the positioning component includes an adsorption assembly, which is provided on both sides of the pressing member and is provided together with the pressing member on the same surface of the battery cell, and the pressing member at least presses the middle portion of the battery cell.

[0016] Furthermore, the pressing members are provided in a number corresponding to the battery cells and are connected to the elastic component. The pressing surfaces of the pressing members are arranged in a curve when in a free state; and the pressing surfaces of the pressing members are flush when pressing the battery cells.

[0017] Furthermore, the positioning component includes a supporting assembly, and the supporting assembly is located on both sides of the pressing member and is arranged opposite to the pressing member.

[0018] Furthermore, the bearing component is a conveying mechanism, the positioning component is provided on the conveying mechanism, and a groove is provided in the middle of the positioning component, and the pressing member is movably provided on the upper part of the groove.

[0019] The correction method for a battery string proposed in the present invention presses a battery cell in the battery string that has already bent in a first direction in the opposite direction of the first battery cell, so that the curvature of the battery cell is reduced or bends in the opposite direction, and the welding ribbon connected to the battery cell is stretched, thereby effectively adjusting the stress distribution of the battery cell, restoring the overall flatness of the battery string, and ensuring stable performance of the battery string in subsequent use.

[0020] Then, by contacting the battery cells one by one, the battery cells to which the force F is applied will gradually return to flatness. At the same time, the battery cells connected in series will gradually extend in the length direction of the battery string, so that the length of the battery string will return to its initial length, and the battery string will be effectively corrected, ensuring the overall flatness of the battery string and improving the installation accuracy and service life of the battery assembly.

[0021] In addition, the present application proposes a device for correcting battery strings, which, through the coordinated action of a pressure member and a positioning member, accurately controls the bending correction process of the battery cells, ensuring that each battery cell is evenly stressed, further optimizing the stress distribution, improving the overall stability and reliability of the battery string, and extending the service life of the battery string. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of a battery string after welding of BC batteries proposed in the present invention;

[0024] Figure 2 A schematic diagram of an implementation method of the battery string correction method proposed in the present invention;

[0025] Figure 3 A schematic diagram of an implementation structure of another battery string correction method proposed by the present invention;

[0026] Figure 4 A schematic diagram of another implementation method of the battery string correction method proposed by the present invention;

[0027] Figure 5 This is a schematic structural diagram of the battery string correction device proposed in the present invention;

[0028] Figure 6 、 Figure 7 Schematic diagram of two states of the pressing member in the battery string device according to the present invention;

[0029] Figure 8 Another embodiment of the battery string correction device proposed by the present invention;

[0030] Figure 9 This is another embodiment of the battery string correction device proposed by the present invention.

[0031] Wherein, the accompanying drawings are marked as follows:

[0032] 100. Battery cell; 200. Solder ribbon; 10. Pressing member; 20. Positioning member; 21. Adsorption assembly; 22. Support assembly; 30. Carrying member; 40. Conveying mechanism. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] In the battery string of BC battery welding, since the welding ribbons 200 are all welded on the same side of the battery cell 100, when the welding ribbons 200 and the battery cell 100 are fixedly welded, the battery cell 100 or the welding ribbon 200 is heated to form a metal connection with the battery cell 100. Since the thermal expansion coefficient of the welding ribbon 200 is inconsistent with that of the battery cell 100, the battery cell 100 is heated unevenly, and the battery cell 100 bends toward the side without the welding ribbon 200 connection, such as Figure 1 As shown, each cell 100 in the battery string after series welding is bent in the first direction under the tensile stress of the welding ribbon 200, that is, bent toward the side without the welding ribbon 200. When the bent battery string is laminated, it is easy to cause stress concentration inside the component, resulting in hidden cracks in the battery cell 100 under the action of stress, affecting the lamination quality and the stability of the battery string.

[0037] In order to improve the degree of bending deformation of the cell string and improve the quality of photovoltaic modules produced by such back-contact cell strings, the present invention proposes a method for correcting the cell string, such as Figure 2As shown, the method includes: pressing multiple battery cells 100 in a battery string one by one, so that at least one end of the battery string extends in the long direction of the battery string, that is, pressing the battery cells 100 in the battery string one by one, and the battery cells 100 gradually accumulate extension in the length direction after being pressed one by one. The battery cells 100 will extend toward the side that is not pressed one by one, thereby increasing the length of the entire battery string and further dissipating the tensile stress of the welding ribbon 200. Experimental verification shows that if a force F is applied to multiple battery cells 100 in the opposite direction of the first direction at the same time, the pressed battery cells 100 will squeeze each other, and the increase in the width area of ​​the battery cells 100 in the entire battery string after returning to a flat state is not released, resulting in the edges of each battery cell 100 being stretched and collided by the stretched battery cells 100, or the welding ribbon 200 in the gap between the battery cells 100 being squeezed and bent, thereby reducing the welding quality of the battery string and affecting the overall performance of the component.

[0038] A force F in the opposite direction to the first direction is applied to the surface of the battery cell 100 in the battery string after welding, so that the curvature of the surface of the battery cell 100 extends toward the side where the welding ribbon 200 is laid, so that the welding ribbon 200 on one side of the battery cell 100 is stretched. The stretched welding ribbon 200 can offset all or part of the bending caused by the tensile stress of the welding ribbon 200, thereby reducing the bending deformation of the battery cell 100.

[0039] When force F is applied to the cell 100, the curvature of the cell 100 gradually decreases, effectively alleviating the tensile stress of the solder ribbon 200 on the cell. The cell 100's curvature can then be smoothed or even bent in the direction of force F. This results in a more even distribution of internal stress within the cell string during module lamination, significantly reducing the risk of hidden cracks. This ensures that the required soldering length of the cell string during module production is met, improving the overall yield and service life of the photovoltaic module, and ensuring that photovoltaic power generation efficiency is not affected.

[0040] It should be noted that pressing the multiple battery cells 100 in the battery string one by one and applying the force F in the opposite direction to the first direction to the battery cells 100 can be performed simultaneously or successively; for example, in some embodiments, referring to Figure 2 、 Figure 3As shown, the multiple battery cells 100 in the battery string can be pressed one by one in advance, and the multiple battery cells 100 are pressed to at least be horizontal, so that the battery cells 100 return to their original size, which is also the maximum size of the battery cells 100, and the battery cells 100 adjacent to the battery cells 100 are pushed outward by the battery cells 100 that are pressed first, and the battery cells 100 are pressed successively so that each battery cell 100 is extended one by one in the length direction of the battery string until the length of the battery string is restored to its initial length and tends to be flat; on the basis of the flatness of the battery string, a force F in the opposite direction to the first direction is applied to the surface of the battery cell 100, so that the battery cell 100 is further applied with a reverse force on the battery cell 100 after it has been restored to be flat, to ensure that the battery cell 100 extends in the opposite direction to the side with the solder ribbon 200, and the solder ribbon 200 on the side of the stretched battery cell 100 can be stretched, and the stretched solder ribbon 200 and the battery cell 100 that is bent by the pressing can basically return to a flat state.

[0041] In another embodiment, when pressing the plurality of battery cells 100 in the battery string one by one and applying the force F in the opposite direction to the first direction to the battery cell 100 can be performed simultaneously, each battery cell 100 can be rolled one by one in a unidirectional manner from one side of the battery string, referring to Figure 4 As shown, while pressing one by one, a reverse force F is applied to the middle of the battery cell 100, and the battery cell 100 can stretch in the opposite direction to the first direction while the adjacent battery cells 100 extend one by one toward the end of the battery string on the side that is not pressed.

[0042] This application uses a dual correction method of pressing each cell individually and applying a counteracting force F to increase the overall length of the cell string by approximately 2-3%, significantly improving the tensile stress dispersion of the solder ribbon 200. Experiments have shown that this method can effectively reduce the hidden crack rate of the cell 100 to below 1%, uniformly distribute stress within the module after lamination, and increase the yield to over 98%. The overall structure of the cell string is more stable, hidden cracks are significantly reduced, and stress is evenly distributed during the lamination process, ensuring the long-term stable operation of the photovoltaic module.

[0043] In some embodiments, the extension of the battery string in the length direction of the battery string includes extending from the middle of the battery string to both ends or extending from one end of the battery string to the other end. When the middle of the battery string extends to both ends, the middle battery cell 100 is first pressed and gradually transferred to both ends to ensure overall uniform extension; when one end extends to the other end, the battery cell 100 at the starting end of the battery string is first pressed and then transferred to the end in sequence. The length of the battery string extends from one end to the other end to avoid local stress concentration, which leads to collisions between the battery cells 100 or squeezing and bending of the welding ribbons 200 between the battery cells 100. At the same time, the length of the battery string can be further corrected so that the corrected battery string length reaches the standard length, and precise alignment during the arrangement of photovoltaic modules ensures uniform module gaps and improves overall installation efficiency.

[0044] Preferably, pressing the multiple battery cells 100 in the battery string one by one also includes: continuously pressing each curved battery cell 100 one by one along the length direction of the battery string, or pressing some battery cells 100 in the battery string one by one at a certain interval, and judging the initial position and interval position of the pressed battery cells 100 one by one by accurately matching the change in the projected width of the battery cell 100 when the battery cell 100 is curved and the projected width when the battery cell 100 is flat, and being able to extend a certain width range to both sides within a reasonable preset spacing after the battery cell 100 is flattened, and judging the number of intervals at which the battery cells 100 are pressed one by one by measuring the extension amount of each battery cell 100, and accurately judging that the change in the width of the battery cell 100 will not exceed the preset range, thereby ensuring that the overall length and width ratio of the battery string are coordinated, and the welding ribbons 200 between the battery cells 100 will not be squeezed and deformed, or the battery cell edges will not be squeezed and cracked.

[0045] In some embodiments, as Figure 4 As shown, the force F applied to the surface of the battery cell 100 in the opposite direction to the first direction causes the battery cell 100 to stretch toward the side where the welding ribbon 200 is laid. The first method is to stretch the battery cell 100 from the initial curvature K toward the side of the welding ribbon after welding and gradually reduce it to zero. When the curvature is reduced to zero, the battery cell 100 is pressed flat. The battery cell 100 is pressed flat, and then the welding ribbon 200 fixed to the surface of the battery cell 100 and the battery cell 100 is stretched, ensuring that the welding ribbon 200 is evenly stretched during the stretching process. In the second method, after the curvature of the cell 100 gradually decreases from the initial curvature K to zero, the cell is continuously pressed in the direction opposite to the first direction to bend to a second curvature K1. Under the reverse force, the curvature of the cell 100 gradually decreases to zero before bending in the reverse direction. The solder ribbon 200 connected to the cell 100 experiences a gradually increasing variable during the stretching process. This ensures that the solder ribbon 200 is uniformly stressed during the stretching process, within the acceptable range of bending deformation of the cell 100, to avoid stress concentration. During the application of the force F, the pressing force and speed are controlled to prevent damage to the cell 100.

[0046] In some embodiments, reference Figure 3As shown, pressing the multiple battery cells 100 in the battery string one by one includes: using pressing members 10 of different heights to contact each battery cell 100 one by one and press the battery cells 100 to the same supporting plane, the battery cells 100 that are pressed first extend to both sides, causing the adjacent battery cells to shift to the side away from the battery cell, and the center positions of the battery cells 100 that are pressed subsequently extend to the two ends of the battery string in turn, by precisely controlling the height difference of the pressing surface of the pressing member 10, ensuring that the battery cells 100 are flattened one by one, and the welding strips 200 between the battery cells 100 are flat, and are not affected by the increase in the width of each battery cell 100 being flattened, thereby avoiding the risk of hidden cracks at the edges of the battery cells 100 due to distortion of the welding strips 200.

[0047] In another embodiment, Figure 4 As shown, pressing the multiple battery cells 100 one by one in the battery string also includes: passing each battery cell 100 in the battery string through a recessed portion in turn along the conveying direction, the recessed direction of the recessed portion is opposite to the first direction, so that the battery cell 100 naturally bends in the opposite direction when passing through, gradually offsetting the initial curvature, ensuring that each battery cell 100 has consistent flatness after passing through the recessed portion, and the welding ribbon 200 is evenly stretched, further reducing the risk of damage to the battery cell 100 due to uneven stress of the welding ribbon 200.

[0048] Preferably, in the present application, while applying a reverse force F to the battery cell 100, the battery cell 100 is also subjected to a simultaneous heating treatment to optimize the ductility of the soldering ribbon 200 and the flexibility of the battery cell 100, improve its adaptability during the pressing process, reduce stress concentration caused by temperature changes, ensure the stability of the battery cell 100 and the soldering ribbon 200 at high temperatures, and further improve the overall performance and reliability of the reverse pressed battery string.

[0049] Based on the method of correcting the battery string proposed in this application, such as Figure 5 As shown, the present application also proposes a device for correcting a battery string, comprising a pressing member 10, a bearing member 30, and a positioning member 20. The bearing member 30 is used to receive a battery string that has been welded in series, the positioning member 20 is used to position at least two sides of a battery cell 100 that is bent in a first direction in the battery string, the pressing member 10 is used to press the battery cell 100 between the positioning members 20 toward one side of the welded welding ribbon 200, and there is a height difference between the positioning member 20 and the pressing member 10. The height difference of the pressing member 10 is used to accurately control the pressing force and the degree of bending of the battery cell 100 after being pressed.

[0050] Specifically, such as Figure 5 、 Figure 6As shown, the welded battery string is placed on the supporting component 30, and the positioning component 20 includes an adsorption component 21. The adsorption component 21 is arranged on both sides of the pressing member 10 and is arranged on the same side of the battery cell 100 together with the pressing member 10. The pressing member 10 elastically presses at least the middle part of the battery cell 100, and the adsorption component 21 evenly adsorbs the two edges of the battery cell 100 to ensure that the battery cell 100 does not move during the pressing process. At the same time, the height of the pressing member 10 is adjustable to accommodate battery cells 100 of different thicknesses.

[0051] First, the bent and convex side of the battery cell faces upward, the protruding length of the pressing member 10 in the natural state is different, the pressing contact surface is located at different height positions, and it can press the surface of the battery cell preferentially than the adsorption component 21, and the battery cells 100 are pressed and flattened one by one in advance, so that the pressed battery cell 100 extends a certain length to at least one end of the battery string, and the extended length is the length of the battery string from the bending deformation to the original length.

[0052] Secondly, after the pressing member 10 is pressed into contact with the battery cell 100, the pressing member 10 is continuously compressed to the same horizontal height until the adsorption component 21 is also in contact with the battery cell 100 at the same time. The adsorption component 21 begins to adsorb and grasp the battery string. After the adsorption component 21 adsorbs and grasps the battery cell 100 and lifts it up, the pressing member 10 is bent by a preset arc in the pressing direction (the opposite direction of the curved bulge of the battery cell 100) under the action of elastic force.

[0053] Specifically, refer to Figure 6 、 Figure 7 As shown, there are a plurality of pressing members 10 corresponding to the battery cells, and each pressing member 10 is connected to the elastic component. When the plurality of pressing members 10 are in a free state, the pressing surfaces of the pressing members 10 are arranged in a curve with different heights, and press against the surface of the battery cell 100 in turn, so that the center of the battery cell 100 extends a predetermined distance toward both ends of the battery string one by one, and the battery cell 100 is pre-flattened; when the pressing surfaces of the plurality of pressing members 10 are flush with each other, the adsorption component 21 grabs the battery string, and the battery cell 100 is lifted. The pressing member 10 presses the middle part of the battery cell. Since the elastic components connected to the pressing member 10 are the same, that is, the elastic force is the same, the battery cell 100 is set to bend a preset curvature in a direction opposite to the first direction. It is required that the preset curvature of each battery cell 100 after being pressed and bent is equal. The elastic connection position of the initial position of the pressing member 10 is arranged in a stepped manner, and the battery cells 100 are pressed one after another. When the adsorption component 21 reaches the final height, the pressure of all elastic components is consistent, so that the curvature of the battery cell 100 bent in the opposite direction is the same.

[0054] Preferably, when the adsorption component 21 grabs and lifts, the pressing part 10 presses and bends the battery cell 100, and the welding ribbon 200 is stretched. The adsorption component 21 can adsorb and transport the entire battery string. The adsorption and transportation and battery string correction are carried out simultaneously, which improves the efficiency of battery string preparation. There is no need to add a separate battery string correction structure. The structure is simple and the cost is low.

[0055] The adsorption component 21 adsorbs both sides of a single battery cell 100, ensuring that after the battery cell 100 is adsorbed by the adsorption component 21, the pressing part 10 can be pressed to the middle of the battery cell 100 and deformed to a preset bending amount toward the side connected to the welding ribbon 200, reducing the original curvature of the battery cell 100 to flatness or reverse bending. The pressing part 10 elastically presses the middle of the surface of the battery cell 100 through the elastic component. When the adsorption component 21 contacts and adsorbs the surface of the battery cell 100, the pressing surface of the pressing part 10 elastically acts on the surface of the battery cell 100, pressing the battery cell 100 to the same height. By precisely adjusting the height of the pressing part 10, it is ensured that the curvature of the battery cell 100 is uniform and within the bending stress tolerance range of the battery cell 100, so as to prevent the battery cell 100 from being deformed by the pressing part 10 due to excessive stress, resulting in fragmentation or hidden cracks in the battery cell 100.

[0056] In another embodiment, Figure 8 As shown, the positioning component 20 includes a support assembly 22, which is used to support the two side edges of the battery cell 100 to ensure the stability of the battery cell 100 when subjected to pressure. The support assembly 22 works in conjunction with the pressure member 10 to act on the battery cell 100. The support assembly 22 provides support force on both sides of the battery cell 100 and fixes at least two side edges of the battery cell 100. It is arranged opposite to the pressure member 10 so that the pressure member 10 can press and bend the middle of the battery cell 100.

[0057] Among them, the supporting component 22 and the pressing member 10 are arranged in opposite directions, including: when the supporting component 22 is located above the battery cell 100, the pressing member 10 is located below the battery cell 100, or, when the supporting component 22 is located below the battery cell 100, the pressing member 10 is located above the battery cell 100, so as to ensure that no matter how the position of the battery cell 100 changes, the edges on both sides can be evenly and firmly supported.

[0058] Specifically, when the support component 22 supports the bottom two sides of the battery cell 100, the pressing member 10 is located above the battery cell 100, the two supporting points of the support component 22 are close to the edge of the battery cell 100, and a recessed space is provided in the middle of the two supporting points. The pressing member 10 applies pressure downward from the middle. The recessed design enables the pressing member 10 to bend naturally when pressing against the middle of the battery cell 100. The recess in the middle of the pressing member 10 matches the curvature of the battery cell 100, ensuring uniform pressure distribution and avoiding local stress concentration.

[0059] More preferably, the carrying member 30 for receiving the battery string is a conveying mechanism 40, referring to Figure 9 As shown, the positioning component 20 is provided on the conveying mechanism 40, and a groove is provided in the middle of the positioning component 20, and the pressing member 10 is provided above the groove. The conveying mechanism 40 is used to continuously convey one end of the battery string to the positioning component 20, so that the battery string passes between the pressing member 10 and the positioning component 20 one by one along the length direction. The groove between the pressing member 10 and the positioning component 20 cooperates to form a concave arc surface gap. The conveying mechanism 40 conveys the battery string through the concave arc surface gap in sequence. The arc gap formed between the pressing member 10 and the positioning component 20 is bent in the opposite direction to the bending of the battery cell 100 (that is, the opposite direction of the first direction), forming a mold for reversely pressing the battery cell 100, so that each battery cell 100 in the battery string passing through the arc gap is reversely bent. After passing through the arc gap, the reversely bent battery cell 100 is bent and deformed in the direction of the first direction. The welding points in the battery string passing through the arc gap are evenly stressed, effectively reducing the risk of hidden cracks. After the cell string passes through the arc-shaped gap, the soldering ribbon 200, which is then welded to the cell 100, retracts in the first direction under the action of tensile stress. This retracted surface of the cell 100 becomes smooth, preventing weld fractures caused by stress concentration during lamination of the photovoltaic module, thereby improving the overall stability and service life of the photovoltaic module. This design also simplifies the production process, reduces manufacturing costs, and provides a reliable guarantee for the production of high-efficiency cell strings.

[0060] Preferably, the pressing member 10 in this embodiment uses an elastic roller to press the battery string part at the corresponding groove. The elastic roller ensures that the various parts of the battery string are evenly stressed through adaptive adjustment. The special material on the roller surface reduces friction and protects the surface of the battery cell 100 from damage, while improving the pressing efficiency and extending the service life of the equipment.

[0061] Preferably, the conveying mechanism 40 uses a conveyor belt, which is wound around the positioning component 20. The middle part of the positioning component 20 is provided with a recess. When the conveyor belt conveys the battery cells 100 in the battery string one by one to the arc-shaped gap between the positioning component 20 and the pressing component 10, the pressing component 10 is tightly matched with the positioning component 20 and elastically pressed against the surface of the battery string, ensuring that each battery cell 100 is subjected to uniform force during the bending process and has the same bending deformation, so that the retraction amount of the battery string after passing through the arc gap is also the same, ensuring that the battery cell 100 maintains the same flatness after retraction, and the bending and leveling of the battery cells 100 in the battery string are consistent, ensuring that the curvature of each battery cell 100 in the same battery string is uniform, avoiding stress concentration and hidden crack risks caused by uneven bending, and further improving the overall stability and service life of the battery string, as well as the manufacturing efficiency and quality of photovoltaic modules.

[0062] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0063] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for correcting a battery string, characterized in that: include: Continuously pressing each of the plurality of battery cells in the battery string one by one along the length direction of the battery string so that at least one end of the battery string extends toward the other end along the length direction of the battery string; At the same time, a force F in the opposite direction to the first direction is applied to the surface of the battery cell bent in the first direction in the battery string after welding, so that the middle of the battery cell stretches toward the side where the welding ribbon is laid. While applying the force F, the battery cell is heated.

2. The method for correcting a battery string according to claim 1, wherein: After the curvature of the battery cell gradually decreases from the first curvature K to zero, it continues to bend in the opposite direction of the first direction to a second curvature K1.

3. The method for correcting a battery string according to claim 1, wherein: Pressing the multiple battery cells in the battery string one by one includes: moving each battery cell in the battery string to the recessed portion in sequence, and the recessed portion is recessed in a direction opposite to the first direction.

4. A device for correcting a battery string, characterized in that: The method for correcting a battery string according to any one of claims 1 to 3 includes a pressure member, a bearing member and a positioning member, wherein the bearing member is used to receive the battery string, the positioning member is used to position at least two sides of the battery cells in the battery string that are bent in a first direction, and the pressure member is used to apply a force F in the opposite direction to the first direction to the surface of the battery cells that are bent in the first direction, wherein the bearing member is a conveying mechanism, the positioning member is provided on the conveying mechanism, and a groove is provided in the middle of the positioning member, and the pressure member is liftably provided on the upper part of the groove.

5. The device for correcting a battery string according to claim 4, characterized in that: The positioning component includes an adsorption component, which is arranged on both sides of the pressing member and is arranged together with the pressing member on the same surface of the battery cell. The pressing member at least presses the middle part of the battery cell.

6. The device for correcting a battery string according to claim 5, characterized in that: The positioning component includes a supporting assembly, and the supporting assembly is located on both sides of the pressing member and is arranged opposite to the pressing member.

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