Solder strip, stringer device and photovoltaic module

Abstract

The embodiment of the application provides a welding strip, a string welding device and a photovoltaic module, and belongs to the technical field of photovoltaic cell production. The welding strip comprises at least two side surfaces, wherein at least one first target side surface is included in the at least two side surfaces, and the first target side surface is plated with a magnetic material in at least one target area, so that the first target side surface guides the welding strip to flip to a target state based on the adsorption of a magnetic force piece. The embodiment of the application plates the first target side surface of the welding strip with a magnetic material, so that the welding strip can be flipped to the correct position when the battery piece is string welded through magnetic adsorption, without the need for further detection, and the welding of the welding strip is not affected; and the string welding efficiency of the battery piece is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic cells, and particularly relates to a welding strip, a string welding device and a photovoltaic module. BACKGROUND

[0002] In a photovoltaic module, in order to increase the reflectivity of the photovoltaic module, a welding strip with a special-shaped structure, such as a triangular welding strip, is used to string weld cell pieces; two side surfaces of the triangular welding strip are coated with silver to increase the reflection of light. When the triangular welding strip is welded to the front surface of the cell piece, the surface without silver coating needs to be pasted to the surface of the cell piece to avoid the triangular welding strip from being turned over.

[0003] At present, the welding strip is pre-fixed by using UV glue before welding in the prior art, the operation steps of the scheme are complex, the welding operation is affected to a certain extent, and after pre-fixing, the welding strip needs to be visually detected by using equipment to ensure that the welding strip does not turn over incorrectly, for example, the reflective surface at the remaining position of the welding strip is adhered to the UV glue and fixed to the surface of the cell piece. SUMMARY

[0004] Embodiments of the present application provide a welding strip, a string welding device and a photovoltaic module to solve or alleviate one or more technical problems in the prior art.

[0005] As a first aspect of the embodiments of the present application, the embodiments of the present application provide a welding strip, including at least two side surfaces, wherein the at least two side surfaces include at least one first target side surface, the first target side surface is plated with a magnetic material in at least one target area, so that the first target side surface is guided to turn over to a target state based on the adsorption of a magnetic force piece.

[0006] In an implementation manner, the at least two side surfaces include at least one second target side surface, and the second target side surface is plated with a reflective material.

[0007] In an implementation manner, the number of the first target side surfaces is one, and the first target side surface is a side surface different from the second target side surface.

[0008] In an implementation manner, the first target side surface is one of the second target side surfaces, and the reflective material covers the magnetic material.

[0009] In an implementation manner, the length of the target area is 60%-100% of the length of the cell piece.

[0010] In an implementation manner, the width of the target area is 60%-100% of the width of the first target side surface; and the thickness of the magnetic material gradually increases in a direction in which two long edges of the target area are close to each other.

[0011] In one embodiment, the magnetic material is plated by at least one of magnetic sputtering and electroplating, and the thickness of the magnetic material is less than or equal to 10 μm.

[0012] In one embodiment, the magnetic material includes a Ni-Fe alloy.

[0013] As a second aspect of the embodiments of this application, this application provides a stringing apparatus for guiding the solder ribbon to a target state when stringing battery cells using any of the above embodiments. The stringing apparatus includes:

[0014] The platform is used to support the solar cells to be wired together;

[0015] A magnetic fixture is fixed below or above the platform; the fixed position of the magnetic fixture is adapted to the structure of the solder strip; the distance between the magnetic fixture and the platform is within a first threshold range; the first threshold is adapted to the magnetic force of the magnetic material on the first target side of the solder strip.

[0016] In one embodiment, the magnetic fixture is located below the platform, and the upper surface of the magnetic fixture is flat.

[0017] In one embodiment, a magnetic fixture is located above the platform, and the lower surface of the magnetic fixture is a V-shaped groove extending along the direction of the solder strip placement.

[0018] As a third aspect of the embodiments of this application, the embodiments of this application provide a photovoltaic module, including at least one battery string, the battery string including multiple battery cells, the multiple battery cells being obtained by wire bonding using the solder strips of any of the above embodiments.

[0019] The embodiments of this application employ the above-described technical solution, which can coat the first target side of the solder strip with a magnetic material, so that the solder strip can be flipped to the correct position for serial welding with the battery cells through magnetic attraction, without further testing and without affecting the welding of the solder strip; thus improving the serial welding efficiency of the battery cells.

[0020] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0021] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0022] Figure 1 A schematic diagram of the cross-sectional structure of a solder strip according to an embodiment of this application is shown.

[0023] Figure 2 A schematic diagram of the cross-sectional structure of a solder strip according to another embodiment of this application is shown.

[0024] Figure 3 A schematic diagram of the cross-sectional structure of a solder strip according to another embodiment of this application is shown.

[0025] Figure 4 A schematic diagram of the cross-sectional structure of a solder strip according to another embodiment of this application is shown.

[0026] Figure 5 A schematic diagram of the cross-sectional structure of a solder strip according to another embodiment of this application is shown.

[0027] Figure 6 A schematic diagram of the cross-sectional structure of a solder strip according to another embodiment of this application is shown.

[0028] Figure 7 This diagram illustrates the structure of a stringing apparatus for stringing battery cells according to an embodiment of this application.

[0029] Figure 8 This diagram illustrates a flipping path of the solder strip during the stringing of battery cells using a stringing apparatus according to an embodiment of this application.

[0030] Figure 9 This diagram illustrates another flipping path of the solder strip when stringing battery cells using a stringing apparatus provided according to an embodiment of this application.

[0031] Figure 10 This diagram illustrates another flipping path of the solder strip when stringing battery cells using a stringing apparatus provided according to an embodiment of this application.

[0032] Figure 11 A schematic diagram of the structure of a stringing apparatus for stringing battery cells according to another embodiment of this application is shown.

[0033] Figure 12 This diagram illustrates a flipping path of the solder strip when stringing battery cells using a stringing apparatus according to another embodiment of this application.

[0034] Figure 13 This diagram illustrates another flipping path of the solder strip when stringing battery cells using a stringing apparatus according to another embodiment of this application.

[0035] Figure 14 This diagram illustrates yet another flipping path of the solder strip when stringing battery cells using a stringing apparatus according to another embodiment of this application. Detailed Implementation

[0036] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0037] This application provides a solder strip, such as Figures 1 to 6 As shown, it includes at least two sides, wherein at least one of the at least two sides includes at least one first target side. The first target side is coated with magnetic material 2 in at least one target area, so that the first target side guides the solder ribbon to flip to the target state based on the adsorption of the magnetic element.

[0038] The solder strip 1 is usually circular or elliptical. In order to enable the sides of the solder strip 1 to reflect light, the solder strip 1 is fabricated into an irregular shape. Figures 1 to 6 Example 1 of commonly used irregularly shaped solder strips is provided.

[0039] like Figure 1 and Figure 2 In the diagram, solder strip 1 is a triangular solder strip 1, comprising three sides. One of these three sides may include a first target side (e.g., ...). Figure 1 ), and may also include two first target sides (such as Figure 2 When the solder strip 1 includes a first target side, the first target side can be the bottom side, which contacts the front of the battery cell during string welding. The first target side is coated with a magnetic material 2 in at least one target area. In the illustrations of this application embodiment, the coated magnetic material 2 is indicated by thick lines. Solder 3 is also coated on the bottom side to realize the welding function of the solder strip 1. Solder 3 can be coated on the entire bottom side, or when the bottom side is the first target side, solder 3 can be coated on the target area where the magnetic material 2 is coated. Solder 3 includes at least one of SnPb, SnPbBi, and SnBiAg, which can realize the welding of the solder strip 1. The solder strip 1 is long and strip-shaped. The length of a section of the solder strip 1 can be cut according to the needs of string welding the battery cells. For example, a section of the solder strip 1 is used to weld two adjacent battery cells in series, and the length of the section of the solder strip 1 is adapted to the length of the two adjacent battery cells. The target area can be one or more sections of the first target side of the long and strip-shaped solder strip 1, or it can be the entire first target side of the long and strip-shaped solder strip.

[0040] The target state is that the side of the solder ribbon 1 with solder 3 is in contact with the surface of the battery cell, and the side with reflective material is away from the surface of the battery cell, so that the solder ribbon 1 can be easily welded and has the function of reflecting light.

[0041] like Figure 3In the process, the welding strip 1 is commonly known as the house-shaped welding strip 1, which includes 5 sides. The 5 sides may include one first target side or two first target sides.

[0042] like Figure 4 In the design, the solder strip 1 is a trapezoidal solder strip 1, comprising four sides. These four sides may include one first target side or two first target sides. When the solder strip 1 includes one first target side, the first target side may be either the bottom side or the top side.

[0043] like Figure 5 In this process, the solder strip 1 is a semi-circular solder strip 1, including two sides, one of which can be a first target side. The first target side can be a bottom side or a semi-circular side. The bottom side is welded to the front of the battery cell.

[0044] like Figure 6 In this design, the solder strip 1, commonly known as the Christmas tree-shaped solder strip 1, includes multiple sides, which may include one or more first target sides. When the solder strip 1 includes one first target side, the first target side may be the bottom side, on which solder 3 is plated for serial contact with the front side of the battery cell. When the solder strip 1 includes multiple first target sides, it may include two or more of the inclined sides. Preferably, the multiple first target sides in the Christmas tree-shaped solder strip 1 are inclined sides arranged opposite each other.

[0045] In this embodiment, by coating the first target side of the solder strip 1 with a magnetic material 2, the solder strip 1 can be magnetically attracted to ensure that it is flipped to the correct position for serial welding with the battery cells without further testing and without affecting the welding of the solder strip 1; thus improving the serial welding efficiency of the battery cells.

[0046] In one embodiment, at least two sides include at least one second target side, on which a reflective material 4 is coated.

[0047] The second target side is the side facing away from the front of the solar cell during the string welding of solar cells, and is used to emit light.

[0048] Reflective materials 4, such as Ag or silicon dioxide, can improve light reflectivity and light absorption. The second target side is usually inclined relative to the bottom side, which is the side that is welded to the front of the solar cell. The inclination of the second target side relative to the bottom side allows the reflected sunlight to be absorbed by the front of the solar cell.

[0049] Relatively speaking, the reflective material 4 only needs to be plated with a thinner layer, while the solder 3 needs to be plated with a thicker layer to ensure the welding and fixing of the solder strip 1. Therefore, in the illustrations of this application embodiment, the thinner covering surface is marked as the plated reflective material 4, and the thicker covering surface is marked as the plated solder 3.

[0050] The second target's side can also be the first target's side. For example, Figure 2 In the triangular weld strip 1, the two inclined sides are the second target sides, and the first target side can also be these two inclined sides.

[0051] In one implementation, the number of first target sides is one, and the first target side side is a side that is different from the second target side side.

[0052] When there is only one first target side, in order to achieve uniform adsorption, the bottom side of the solder ribbon 1, that is, the side that contacts the surface of the battery cell, is usually set as the first target side. When the solder ribbon 1 is placed on the battery cell, a magnetic component with the opposite polarity to the magnetic material 2 can be placed below the battery cell to attract the first target side to the surface of the battery cell.

[0053] When the bottom side of the solder ribbon 1 is attached to the battery cell, the bottom side cannot reflect light. During the manufacturing process of the solder ribbon 1, the first target side is defined as a side that is different from the second target side.

[0054] In this embodiment, the number of first target sides is one, that is, magnetic material 2 is plated on one side of the solder strip 1. This reduces the amount of magnetic material 2 used and saves costs.

[0055] In some other examples, for example Figure 4 In the case where there is only one trapezoidal welding strip 1, the top side of the trapezoidal welding strip 1 can also be set as the first target side. During the serial welding, a magnetic component is placed above the trapezoidal welding strip 1 so that the top side of the trapezoidal welding strip 1 faces upward, thus ensuring that the welding strip 1 is correctly positioned.

[0056] Therefore, when dealing with solder strips 1 of different shapes, the setting of the first target side can be adaptively adjusted according to the actual situation, and these methods are all within the protection scope of the embodiments of this application.

[0057] In one embodiment, the first target side is one of the second target sides, and the reflective material 4 covers the magnetic material 2.

[0058] In this embodiment, the first target side is not limited to the bottom side of the solder strip 1; it can be set as one of the second target sides. The second target side is an inclined side of the battery cell. To ensure the balance during magnetic adsorption, the multiple first target sides are paired sides among the multiple second target sides.

[0059] like Figure 2 In this design, the solder strip 1 is a triangular solder strip 1, comprising three sides. Two inclined sides are the second target sides, and simultaneously the first target sides. That is, both reflective material 4 and magnetic material 2 are plated on these two inclined sides. To ensure the reflective performance of the reflective material, the magnetic material 2 can be plated first, followed by the reflective material 4. This design allows for layer-by-layer plating during the production process of the solder strip 1, such as through printing or electroplating, without the need to flip the solder strip 1.

[0060] like Figure 3 In the middle, the welding strip 1 is commonly known as the house-shaped welding strip 1, which includes 5 sides. Among the 5 sides, there may be two first target sides. The two first target sides are two inclined sides, which are the same as the second target sides.

[0061] like Figure 4 In the process, the welding strip 1 is a trapezoidal welding strip 1, which includes 4 sides. It can be that two inclined sides are the second target sides, or two inclined sides and the top side are the second target sides. At the same time, the top side or the bottom side can be the first target side, or two inclined sides can be the first target side. In this case, magnetic material 2 and reflective material 4 can be plated layer by layer on the two inclined sides.

[0062] like Figure 5 In the middle, the welding strip 1 is a semi-circular welding strip 1, which includes two sides. The semi-circular side can be the first target side and the second target side at the same time.

[0063] like Figure 6 In this design, solder ribbon 1, commonly known as Christmas tree-shaped solder ribbon 1, comprises multiple sides. These sides can all be secondary target sides, meaning reflective material 4 is deposited on the multiple inclined sides to increase light reflectivity and absorptivity. Alternatively, multiple sides can be primary target sides, or one or more pairs of inclined sides can be designated as primary target sides. For example, the top two sides can be designated as primary target sides, and the other inclined sides are not coated with magnetic material 2, reducing material waste. During cell stringing, a magnetic component is placed above solder ribbon 1 to attract the two inclined sides away from the cell surface, ensuring the correct positioning of solder ribbon 1.

[0064] In one implementation, the length of the target region is 60%-100% of the length of the solar cell.

[0065] In the solder ribbon 1, a magnetic material 2 can be plated on a local area of ​​the first target side to correctly adjust the placement of the solder ribbon 1. The solder ribbon 1 needs to be attached to the surface of the battery cell. In order to speed up the adjustment of the position of the solder ribbon 1, a longer target area can be set to attract the solder ribbon 1 from multiple positions to adjust its orientation.

[0066] While ensuring the adjustment speed of the welding strip 1, the length of the target area can be limited to 60%-100% of the length of the battery cell, for example, 60%, 70%, 85% or 100% of the length of the battery cell. When the length of the target area is 100% of the length of the battery cell, magnetic material 2 can be plated on the entire side of the first target side.

[0067] When solder ribbon 1 is used to solder solar cells, it is first attached to the front of one solar cell, then to the back of another, and then around to the front of yet another solar cell. Therefore, the target area on the first target side of solder ribbon 1 can be multiple discontinuous segments. When attached to the front of the solar cell, the placement of solder ribbon 1 can be adjusted by magnetic attraction. After adjustment, subsequent solder ribbons may be adjusted correctly in one go, or they may need to be adjusted again by magnetic attraction. Therefore, adjustments can be made by magnetic attraction at intervals, that is, a target area can be set at intervals.

[0068] Preferably, a target area is set in a section of the solder strip 1 that is attached to the front side of the battery cell, and no target area is set when the solder strip 1 is attached to the back side of the battery cell.

[0069] In one embodiment, the width of the target area is 60%-100% of the width of the first target side; the thickness of the magnetic material 2 gradually increases from the two long edges of the target area toward each other.

[0070] like Figures 1 to 6 As shown, the magnetic material 2 does not need to be plated to cover the entire width of the first target side of the solder strip 1. It can be selectively plated to 60%-100% of the width of the first target side, for example, 60%, 70%, 85% or 100%. By limiting this, the amount of magnetic material 2 can be reduced while ensuring the adjustment of the magnetic force of the solder strip 1, thus saving costs.

[0071] For example, such as Figure 1 As shown, the height of the magnetic material 2 gradually increases from the edge toward the middle, which strengthens the magnetic force in the middle and ensures the magnetic force of the adjusting solder strip 1.

[0072] In one embodiment, the magnetic material 2 includes at least one of Ni-Fe alloys.

[0073] The magnetic material 2 can also be any of the various feasible materials known now and in the future to those skilled in the art, and the embodiments of this application do not limit this.

[0074] In one embodiment, the magnetic material 2 is plated by at least one of magnetic sputtering and electroplating, and the plating thickness of the magnetic material 2 is less than or equal to 10 μm.

[0075] The plating thickness of the magnetic material 2 is less than or equal to 10 μm. For example, if the first target side is the bottom side of the solder strip 1, it can be plated thicker, for example, 5-10 μm; if the first target side is the inclined side of the solder strip 1, it can be plated thinner, because in this case, it can be attracted by the magnetic force forming the angle, which is relatively easier to adjust, so it can be plated thinner, for example, 2-8 μm.

[0076] The plating method of magnetic material 2 can be adapted to the type of magnetic material 2, and can also be adapted to the plating method of reflective material 4. For example, if the first target side and the second target side are the same side, magnetic material 2 and reflective material 4 can use the same plating method.

[0077] Other components of the solder strip in the above embodiments can be derived from various technical solutions now and in the future known to those skilled in the art, and will not be described in detail here.

[0078] This application also provides a battery cell stringing apparatus, such as... Figures 7 to 14 As shown, the string welding device includes a platform 5 and a magnetic fixture 6. In the figure, "F" and the arrow represent magnetic force.

[0079] Platform 5 is used to support the solar cells to be strung together; platform 5 can be a conveying platform 5, or it can convey the solar cells to a fixed platform, which is platform 5 in the stringing device.

[0080] A magnetic fixture 6 is fixed below or above the platform 5; the fixed position of the magnetic fixture 6 is adapted to the structure of the solder strip 1; the distance between the magnetic fixture 6 and the platform 5 is within a first threshold range; the first threshold is adapted to the magnetic force of the magnetic material on the first target side of the solder strip 1.

[0081] The magnetic jig 6 has a magnetic polarity opposite to that of the magnetic material 2 on the first target side of the solder ribbon 1, which allows the placement of the solder ribbon 1 to be adjusted based on the magnetic attraction.

[0082] When the magnetic properties of the magnetic jig 6 are opposite to those of the magnetic material 2 on the first target side of the solder strip 1, the adjustment of the solder strip 1 is better guaranteed, ensuring correct adjustment.

[0083] In some other feasible embodiments, the magnetic jig 6 may have the same polarity as the magnetic material 2 on the first target side, and the inclined side of the solder ribbon 1 may be made to face away from the front of the battery cell by means of repulsion.

[0084] In one implementation, such as Figures 7 to 10 As shown, the magnetic fixture 6 is located below the platform 5, and the upper surface of the magnetic fixture 6 is a plane.

[0085] When the first target side is the bottom side, the magnetic fixture 6 is set below the platform 5 and can attract the first target side to the front of the battery cell.

[0086] In one implementation, such as Figures 11 to 14 As shown, the magnetic fixture 6 is located above the platform 5, and the lower surface of the magnetic fixture 6 is a V-shaped groove extending along the placement direction of the welding strip 1.

[0087] When the first target side is an inclined side, it is necessary to make the inclined side face away from the front of the battery cell. Therefore, the magnetic jig 6 is set above the platform 5 and its shape is adapted to at least two inclined sides to attract the two inclined sides away from the front of the battery cell.

[0088] In solder strip 1, as shown Figure 4 When the trapezoidal welding strip 1 in the first target side is the top side, the magnetic fixture 6 can be located above the platform 5 and can be block-shaped or have a planar lower surface.

[0089] The magnetic jig 6 can be elongated, extending in the same direction as the solder ribbon 1, with its length adapted to the length of the solder ribbon 1. This allows for equal adsorption force on the solder ribbon 1 at multiple locations, facilitating uniform rotation of the solder ribbon 1. The magnetic jig 6 can have magnetic force along its entire length or in multiple spaced-apart areas. The magnetic force of the magnetic jig 6 is opposite to that of the solder ribbon, enabling it to attract the sides of the solder ribbon 1 coated with magnetic material and guide the solder ribbon 1 to the target orientation.

[0090] The following example uses 210R two-piece solar cells: the size of a whole solar cell is 210mm×182mm; the size of a half solar cell is 105mm×182mm; the length of a section of welding strip 1 is 105mm×2, which is 210mm.

[0091] A 210mm long section of welding strip was weighed and found to weigh 0.103g.

[0092] To ensure the solder strip can be stably flipped to the target state, the following parameters need to be ensured:

[0093] Magnetic permeability: Determined based on the coating thickness and material properties of the nickel-iron alloy material, combined with whether the distance between each main grid of the electromagnetic system affects each other.

[0094] Coercivity: During demagnetization, the solder strip will not be deflected due to residual magnetism. This value is set according to the width of the bottom edge of the solder strip to facilitate magnetization and demagnetization.

[0095] Saturation magnetism: ensures that the magnetic force can flip the solder strip over.

[0096] Curie temperature: The critical temperature at which a magnetic material loses its ferromagnetism (strong magnetism) and transforms into paramagnetism (weak magnetism). Above this temperature, the material can no longer be magnetized by an external magnetic field.

[0097] In the example above, the length of a welding strip is 210mm, and the first threshold of the distance between the magnetic fixture and the platform is preferably 0.5-2mm, which can balance the adsorption force and the positioning accuracy.

[0098] In this embodiment, Ni-Fe alloy is a commonly used magnetic material. According to IEC60404 and ISO1522 standards, the magnetic material is a Ni-Fe alloy (such as 1J22) with a permeability >5000 uH / m, coercivity <10 A / m, saturation magnetization 21.5T, Curie temperature 450℃, and magnetic attenuation can be avoided when the coating thickness is ≤10um.

[0099] The magnetic field strength of the magnetic jig is 50-200 mT, and precise control can be achieved by adjusting the current of the electromagnetic coil inside the magnetic jig (0.1-0.5A).

[0100] exist Figures 7 to 10 In the example shown, magnetic material 2 is plated on the bottom side of the solder strip 1, and a magnetic fixture is positioned below the platform. The technical specifications designed according to relevant technical standards include the following: the bottom side of the solder strip is electroplated with a Ni-Fe alloy with a thickness of 5-10 μm, which can meet the requirement of a magnetic permeability >5000 μH / m, while controlling the meter resistance increment <1%; the magnetic field strength of the magnetic fixture is 50-100 mT, calculated according to the magnetic force calculation formula, ensuring a 130 μm gap adsorption force >2 mN; based on the grid spacing of the solar cells, the width of the bottom side of the solder strip is determined to be 0.2-0.4 mm, and the height is 0.3-0.8 mm. The Curie temperature is >450℃, because the conventional welding temperature window is 380℃-450℃; if the Curie temperature is too low, the magnetism of the solder strip is easily damaged during welding.

[0101] exist Figures 11 to 14In the example shown, magnetic material 2 is deposited on both sides of the solder ribbon 1, and a magnetic fixture is positioned above the platform. The solder ribbon is flipped to the target state by double-sided magnetic adsorption. A Ni-Fe layer with a thickness of 2-5 μm is magnetron sputtered on both sides. This method allows for faster and more stable control of the solder ribbon flipping through adsorption on both sides. Within this thickness range, the magnetic permeability is maintained at >5000 μH / m while reducing the thickness. The magnetic field strength of the magnetic fixture is adjustable from 20-80 mT.

[0102] In one example, the magnetic field strength of the magnetic jig can be adjusted to the above-mentioned range during the welding process. After welding is completed, the magnetic field strength of the magnetic jig can be adjusted to be less than the minimum value of the above-mentioned range to reduce the magnetic attraction between the magnetic jig and the welding strip, so that the stringing production line can transport new cells to be stringed.

[0103] In one example, one magnetic jig corresponds to one solder strip setup, and the spacing between multiple magnetic jigs is adapted to the grid line spacing of the solar cell.

[0104] In one example, the magnetic fixture has multiple magnetic elements, which are elongated. The spacing between adjacent magnetic elements is adapted to the grid spacing of the battery cell. During string bonding, the battery cell is accurately placed at the target position so that the grid of the battery cell is aligned with the magnetic element, thereby attracting the bonding strip to the position aligned with the corresponding magnetic element.

[0105] In one example, the stringing apparatus also includes a clamp to define the positions of multiple solder strips used for stringing the solar cells, ensuring a one-to-one correspondence between the solder strips and the grid lines of the solar cells. The solder strips are then flipped to the target position using magnetic attraction. This clamp can be the same as those used in existing stringing equipment.

[0106] Other configurations of the string welding apparatus in the above embodiments can be adopted from various technical solutions now and in the future known to those skilled in the art, and will not be described in detail here.

[0107] This application provides a photovoltaic module including at least one battery string, the battery string including multiple battery cells, the multiple battery cells being obtained by wire bonding using the solder strips of any of the above embodiments.

[0108] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.

[0109] 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 that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0110] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; 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 application according to the specific circumstances.

[0111] In this application, unless otherwise expressly 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 being 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 being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0112] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. 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 implementations and / or arrangements discussed.

[0113] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A welding strip, characterized in that, The device includes at least three sides, wherein the at least three sides include a first target side. The number of first target sides is less than the total number of sides of the solder strip. The first target side has a magnetic material plated in at least one target area. The magnetic material has a permeability greater than 5000 uH / m, so that the first target side guides the solder strip to flip to a target state based on a magnetic element. The polarity of the magnetic material is the same as or opposite to the polarity of the magnetic element. The first target side has multiple target areas, which are areas on the front side of the solder strip attached to the battery cell. The width of the target area is 60%-100% of the width of the first target side. The thickness of the magnetic material gradually increases from the two long edges of the target area towards each other.

2. The welding strip according to claim 1, characterized in that, At least one of the three sides includes at least one second target side, which is coated with a reflective material.

3. The welding strip according to claim 2, characterized in that, The number of the first target side is one, and the first target side is a side that is different from the second target side.

4. The welding strip according to claim 2, characterized in that, The first target side is one of the second target sides, and the reflective material covers the magnetic material.

5. The welding strip according to any one of claims 1 to 4, characterized in that, The length of the target area is 60%-100% of the length of the solar cell.

6. The welding strip according to any one of claims 1 to 4, characterized in that, The magnetic material is plated by at least one of magnetic sputtering and electroplating, and the plating thickness of the magnetic material is less than or equal to 10 μm.

7. The welding strip according to any one of claims 1 to 4, characterized in that, The magnetic material includes a Ni-Fe alloy.

8. A string welding device, characterized in that, The stringing apparatus, used for guiding the solder ribbon to a target state when stringing solar cells using the solder ribbon according to any one of claims 1 to 7, comprises: The platform is used to support the solar cells to be wired together; A magnetic fixture is fixed below or above the platform; the fixed position of the magnetic fixture is adapted to the structure of the solder strip; the distance between the magnetic fixture and the platform is within a first threshold range; the first threshold is adapted to the magnetic force of the magnetic material on the first target side of the solder strip; the magnetic field strength of the magnetic fixture is 50. 100mT; A fixture is used to define the positions of multiple solder strips for stringing solar cells, so that the solder strips are set in a one-to-one correspondence with the grid lines of the solar cells, and then the magnetic fixture is used to flip the solder strips to the target state.

9. The string welding apparatus according to claim 8, characterized in that, The magnetic fixture is located below the platform, and the upper surface of the magnetic fixture is flat.

10. The string welding apparatus according to claim 8, characterized in that, The magnetic fixture is located above the platform, and the lower surface of the magnetic fixture is a V-shaped groove extending along the direction of the welding strip placement.

11. A photovoltaic module, characterized in that, It includes at least one battery string, the battery string comprising a plurality of battery cells, the plurality of battery cells being obtained by wire bonding according to any one of claims 1 to 7.

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