Method and device for correcting battery string

Abstract

The invention discloses a method and device for correcting a battery string, and relates to the technical field of battery string production, and the method comprises the steps: pressing a plurality of battery pieces in the battery string one by one, and enabling at least one end of the battery string to extend in the length direction of the string; an acting force F opposite to the first direction is applied to the surfaces, bent in the first direction, of the battery pieces in the welded battery strings, the battery pieces which are pressed one by one sequentially extend in the length direction of the battery strings on the sides which are not pressed one by one, and the applied acting force F enables the middles of the battery pieces to extend towards the faces where the welding strips are laid; by accurately controlling the magnitude and the direction of the acting force F, the bending degree of the battery piece is adjusted to a preset range, and the overall flatness of the battery string is ensured, so that the stability of the battery string is improved, the service life of the battery string is prolonged, and the risks of subfissure and breakage of the battery piece caused by bending are reduced.

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] The back-contact cells are connected in series via welding ribbons, and the welding ribbons are interlaced and interconnected on the back of all cells. Since the welding ribbons are fixed to the cell surface by heating and welding, the welding ribbons are prone to generate thermal stress during the heating process. After the temperature of the cell string is lowered, the welding ribbons will generate tensile stress on the cell, causing the cell to bend and deform toward the side without welding ribbons. This causes the cell string to be shorter, not meeting the standard length of the cell string in the photovoltaic module. At the same time, the welding ribbons connecting the cells in the cell string will also bend, the edges of the cells are prone to overlap, and the cell string is uneven, resulting in damage or hidden cracks in the cells when the cell string is laminated after layout, reducing the production quality of solar panels. 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: Pressing the multiple battery cells in the battery string one by one so that the battery string extends in its length direction; A force F in the opposite direction to the first direction is applied to the surface of the battery cell in the battery string after welding, which is bent in the first direction, so that the middle of the battery cell stretches toward the side where the welding ribbon is laid.

[0006] Furthermore, the battery string extending in the length direction thereof 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.

[0007] Furthermore, pressing the multiple battery cells in the battery string one by one includes pressing each battery cell one by one continuously along the length direction of the battery string, or pressing some of the battery cells in the battery string at intervals.

[0008] Further, 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.

[0009] 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.

[0010] 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.

[0011] Furthermore, while the force F is applied, the battery cell is heated.

[0012] In 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, the bearing member being used to receive the battery string, the positioning member being used to position at least two sides of a battery cell bent in a first direction in the battery string, and the pressure member being used to apply a force F in the opposite direction to the first direction to the surface of the battery cell bent in the first direction.

[0013] Furthermore, 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, and the pressing member at least presses the middle part of the battery cell.

[0014] Furthermore, the pressing members are provided in a plurality corresponding to the battery cells and are connected to the elastic component. The pressing surfaces of the pressing members in a free state are arranged in a curve; and the pressing surfaces of the pressing members when pressing the battery cells are flush.

[0015] 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.

[0016] Furthermore, the bearing component is a conveying mechanism, the positioning component is arranged on the conveying mechanism, and a groove is provided in the middle of the positioning component, and the pressing member is liftably arranged on the upper part of the groove.

[0017] The correction method for a battery string proposed in the present invention presses a battery cell in the battery string that has been 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 reverse direction, and the welding strip 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.

[0018] Then, by contacting the battery cells one by one, the battery cell to which force F is applied will gradually return to flatness, while 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 returns to its initial length, so that the battery string can be effectively corrected, ensuring the overall flatness of the battery string and improving the installation accuracy and service life of the battery assembly.

[0019] In addition, the present application proposes a device for correcting a battery string, which, through the coordinated action of a pressure piece and a positioning component, accurately controls the bending correction process of the battery cell, ensures that each battery cell is evenly stressed, further optimizes stress distribution, improves the overall stability and reliability of the battery string, and extends the service life of the battery string. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0021] Figure 1 A schematic diagram of a battery string after welding of BC batteries proposed in the present invention; Figure 2 A schematic diagram of an implementation method of the battery string correction method proposed by the present invention; Figure 3 A schematic diagram of another implementation structure of a battery string correction method proposed by the present invention; Figure 4 A schematic diagram of another implementation method of the battery string correction method proposed by the present invention; Figure 5 This is a schematic diagram of the structure of the battery string correction device proposed by the present invention; Figure 6 , Figure 7 A schematic diagram of two states of a pressing member in a battery string device according to the present invention; Figure 8 Another embodiment of the battery string correction device proposed by the present invention; Fig. 9 This is another embodiment of the battery string correction device provided by the present invention.

[0022] Wherein, the accompanying drawings are marked as follows: 100, battery cell; 200, welding strip; 10, pressing member; 20, positioning component; 21, adsorption component; 22, supporting component; 30, bearing component; 40, conveying mechanism. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0024] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0025] 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.

[0026] 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 ribbons 200 are heated to connect the welding ribbons 200 and the battery cell 100 by metal. Since the thermal expansion coefficient of the welding ribbons 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 ribbons 200 connection, such as Figure 1 As shown, each battery 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.

[0027] In order to improve the degree of bending and deformation of the battery string and improve the quality of photovoltaic modules produced by such back-contact battery strings, the present invention proposes a method for correcting the battery string, such as Figure 2 As shown, it includes: pressing multiple battery cells 100 in the 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, and the battery cells 100 will extend to the side that is not pressed one by one, so that the length of the entire battery string is increased, and the tensile stress of the welding strip 200 is further dispersed. It has been verified by experiments that if a force F is pressed against multiple battery cells 100 in the opposite direction of the first direction at the same time, the pressed battery cells 100 will be squeezed against each other, and the increase in the width area of ​​the battery cells 100 in the entire battery string after restoring the flat state is not released, resulting in the edges of each battery cell 100 being stretched, collided and broken by the battery cells 100 that are stretched against each other, or the welding strip 200 at the gap between the battery cells 100 is squeezed and bent, and the welding quality of the battery string is reduced, affecting the overall performance of the component.

[0028] A force F in the opposite direction to the first direction is applied to the surface of the battery cell 100 bent in the first direction 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 strip 200 is laid, so that the welding strip 200 on one side of the battery cell 100 is stretched. The stretched welding strip 200 can offset all or part of the bending caused by the tensile stress of the welding strip 200, thereby reducing the bending deformation of the battery cell 100.

[0029] After the force F is applied to the cell 100, the curvature of the cell 100 gradually decreases, the tensile stress of the welding ribbon 200 on the cell is effectively relieved, and the curvature of the cell 100 can be flattened or bent in the opposite direction of the force F. This makes the internal stress distribution of the cell string more uniform when it passes through the component lamination, and the risk of hidden cracks is significantly reduced. The welding length of the cell string in the component preparation is met, the overall yield and service life of the photovoltaic component are improved, and the photovoltaic power generation efficiency is ensured not to be affected.

[0030] 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 3 As 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 at least to a horizontal state, so that the battery cells 100 restore 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 to extend outward by the battery cells 100 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 the 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 basis of having restored the flatness, to ensure that the battery cell 100 extends in the opposite direction to the side with the welding strip 200, and the welding strip 200 on the side of the stretched battery cell 100 can be stretched, and the stretched welding strip 200 and the battery cell 100 that is bent by the pressing can basically restore to a flat state.

[0031] 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 cells 100 can be performed simultaneously, each battery cell 100 can be rolled one by one in one direction 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 extend 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.

[0032] This application increases the overall length of the battery string by about 2-3% through double correction of pressing and applying reverse force F one by one, and significantly improves the tensile stress dispersion effect of the welding strip 200. Experiments show that this method can effectively reduce the hidden crack rate of the battery cell 100 to less than 1%, and the internal stress distribution of the component is uniform after lamination, and the yield is increased to more than 98%. The overall structure of the battery string is more stable, the hidden crack phenomenon is greatly reduced, and the stress is evenly distributed during the lamination process, ensuring the long-term stable operation of the photovoltaic module.

[0033] 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 then 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 may cause collisions between the battery cells 100 or extrusion 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.

[0034] 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 projection width of the battery cell 100 when the battery cell 100 is curved and the projection 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 is coordinated, and the welding strips 200 between the battery cells 100 will not be squeezed and bent or deformed, or the edges of the battery cells will be squeezed and cracked.

[0035] In some embodiments, Figure 4As 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, including: the first method is to stretch the battery cell 100 from the initial curvature K to the side of the welding ribbon after welding and gradually reduce it to zero, 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 The second type is that after the curvature of the battery cell 100 gradually decreases from the initial curvature K to zero, the battery cell 100 continues to bend in the opposite direction of the first direction to a second curvature K1, so that the curvature of the battery cell 100 gradually decreases to zero under the reverse force and then bends in the reverse direction. The welding strip 200 fixed to the battery cell 100 experiences a gradually increasing variable during the stretching process. Within the tolerable range of the bending deformation of the battery cell 100, ensure that the welding strip 200 is uniformly stressed during the stretching process to avoid stress concentration. In the process of applying the force F, the pressing force and speed are controlled to prevent damage to the battery cell 100.

[0036] In some embodiments, reference Figure 3 As 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 receiving plane, the battery cells 100 that are pressed preferentially 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, and by accurately controlling the height difference of the pressing surface of the pressing member 10, it is ensured that the battery cells 100 are flattened one by one, and the welding strips 200 between the battery cells 100 are flat and not affected by the increased width of each battery cell 100 being flattened, thereby avoiding the risk of hidden cracks at the edges of the battery cells 100 caused by distortion of the welding strips 200.

[0037] In another embodiment, if 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.

[0038] Preferably, in the present application, while applying a reverse force F to the battery cell 100, a heating treatment is also simultaneously performed on the battery cell 100 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, and ensure the stability of the battery cell 100 and the soldering ribbon 200 at high temperatures, thereby further improving the overall performance and reliability of the reverse pressed battery string.

[0039] 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 the battery string that has been welded in series, the positioning member 20 is used to position at least two sides of the battery cell 100 that is bent in the 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 welding ribbon 200 after welding, there is a height difference between the positioning member 20 and the pressing member 10, and the pressing strength and the bending degree of the battery cell 100 after being pressed are precisely controlled by the height difference of the pressing member 10.

[0040] Specifically, Figure 5 , Figure 6 As 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 surface of the battery cell 100 together with the pressing member 10. The pressing member 10 at least elastically presses 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 adapt to battery cells 100 of different thicknesses.

[0041] 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 before 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 from the length of the bent and deformed battery string to the original length.

[0042] 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, and 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 bending protrusion of the battery cell 100) under the action of elastic force.

[0043] Specifically, refer to Figure 6, Figure 7 As shown, there are a plurality of pressing members 10 and battery cells correspondingly, and each pressing member 10 is connected to an 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 are pressed against the surface of the battery cell 100 in sequence, so that the center of the battery cell 100 extends a predetermined distance to both ends of the battery string one by one, and the battery cell 100 is pre-flattened; the pressing surfaces of the plurality of pressing members 10 when pressing the battery cell 100 are flush include: after the adsorption component 21 grabs the battery string, the battery cell 100 is lifted, at this time The pressing member 10 presses against the middle 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.

[0044] Preferably, when the adsorption component 21 grabs and lifts, the pressing part 10 presses and bends the battery cell 100, and the welding strip 200 is stretched. The adsorption component 21 can adsorb and transport the battery string as a whole. 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.

[0045] The adsorption component 21 adsorbs both sides of a single battery cell 100, ensuring that the pressing piece 10 can press the battery cell 100 to the middle of the battery cell 100 and deform it to a preset bending amount toward the side connected to the welding strip 200 after being adsorbed by the adsorption component 21, reducing the original curvature of the battery cell 100 to flatness or reverse bending. The pressing piece 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 piece 10 elastically acts on the surface of the battery cell 100, pressing the battery cell 100 to the same height. By accurately adjusting the height of the pressing piece 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 excessive pressure from the pressing piece 10, resulting in fragmentation or hidden cracks of the battery cell 100.

[0046] In another embodiment, if Figure 8As 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 it is subjected to a pressure. The support assembly 22 works in conjunction with the pressing 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, and is arranged opposite to the pressing member 10 so that the pressing member 10 presses and bends the middle of the battery cell 100.

[0047] Among them, the supporting component 22 and the pressing member 10 are arranged opposite to each other, 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.

[0048] Specifically, when the support component 22 supports the bottom two sides of the battery cell 100, the pressing piece 10 is located above the battery cell 100, the two supporting points of the support component 22 are close to the edges of the battery cell 100, and a recessed space is provided in the middle of the two supporting points. The pressing piece 10 applies pressure downward from the middle. The recessed design enables the pressing piece 10 to bend naturally when pressing against the middle of the battery cell 100. The recess in the middle of the pressing piece 10 matches the curvature of the battery cell 100, ensuring uniform pressure distribution and avoiding local stress concentration.

[0049] Further preferably, the carrying member 30 for receiving the battery string is a conveying mechanism 40, referring to Fig. 9As shown, the positioning component 20 is arranged on the conveying mechanism 40, and a groove is provided in the middle of the positioning component 20, and the pressing member 10 is arranged 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, and 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, and 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, and after the reversely bent battery cell 100 passes through the arc gap, the battery cell 100 is bent and deformed in the direction of the first direction, and each welding point in the battery string passing through the arc gap is evenly stressed, effectively reducing the risk of hidden cracks. The welding strip 200 of the battery string further welded to the battery cell 100 after passing through the arc gap will shrink in the first direction under the action of tensile stress, and the surface of the battery cell 100 after shrinking tends to be flat, avoiding the fracture of the welding point due to stress concentration during the lamination of the photovoltaic module, and improving the overall stability and service life of the photovoltaic module. At the same time, this design simplifies the production process, reduces manufacturing costs, and provides reliable guarantee for the production of high-efficiency battery strings.

[0050] Preferably, the pressing member 10 in this embodiment uses an elastic roller to press the battery string portion at the corresponding groove. The elastic roller ensures uniform force on each part of the battery string 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.

[0051] 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 depression. 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 member 10, the pressing member 10 cooperates closely with the positioning component 20 and elastically presses 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-shaped 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.

[0052] 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 above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0053] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for correcting a battery string, characterized in that: include: Pressing the multiple battery cells in the battery string one by one so that at least one end of the battery string extends along the length direction of the battery string; A force F in the opposite direction to the first direction is applied to the surface of the battery cell in the battery string after welding, which is bent in the first direction, so that the middle of the battery cell stretches toward the side where the welding strip is laid.

2. The method for correcting a battery string according to claim 1, characterized in that: The battery string extends in the length direction thereof, including extending from the middle of the battery string to both ends or extending from one end of the battery string to the other end.

3. The method for correcting a battery string according to claim 1, characterized in that: Pressing the multiple battery cells in the battery string one by one includes: pressing each battery cell one by one continuously along the length direction of the battery string, or pressing some of the battery cells in the battery string at intervals.

4. The method for correcting a battery string according to claim 1, characterized in that: 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.

5. The method for correcting a battery string according to claim 1, characterized in that: Pressing the multiple battery cells in the battery string one by one includes: using a pressing member to contact each of the multiple battery cells one by one and press them to the same receiving plane.

6. The method for correcting a battery string according to claim 1, characterized in that: 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 the opposite direction to the first direction.

7. The method for correcting a battery string according to claim 1, characterized in that: While the force F is applied, the battery cell is heated.

8. 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 7 comprises 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 a battery cell bent in a first direction in the battery string, 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 bent in the first direction.

9. The device for correcting a battery string according to claim 8, 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.

10. The device for correcting a battery string according to claim 8, characterized in that: The pressing members are provided in a plurality corresponding to the battery cells and are connected to the elastic component. The pressing surfaces of the pressing members in a free state are arranged in a curve; the pressing surfaces of the pressing members when pressing the battery cells are flush.

11. The device for correcting a battery string according to claim 9, 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.

12. The device for correcting a battery string according to claim 8, characterized in that: The bearing component is a conveying mechanism, the positioning component is arranged on the conveying mechanism, a groove is arranged in the middle of the positioning component, and the pressing member is arranged on the upper part of the groove in a liftable manner.

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