Solder strip preparation device and solder strip

Abstract

The utility model provides a solder strip preparation device and a solder strip, and relates to the technical field of photovoltaic cells. The solder strip preparation device comprises a base and a rotating part rotationally connected with the base, the base is concaved inwards to form a solution tank, the rotating part rotates in the solution tank, a clamping groove is formed in the periphery of the rotating part in the circumferential direction of the rotating part, a base body is arranged in the clamping groove, and in the rotating process of the rotating part, the base body is clamped in the clamping groove. The clamping groove is arranged on the substrate, so that the substrate is in contact with a solution arranged in the solution groove, the surface of the substrate is coated with the solution, the clamping groove is provided with a plurality of widening parts arranged at intervals, and the solution is accumulated at the widening parts and solidified to form a welding spot part connected with the substrate. According to the solder strip preparation device and the solder strip provided by the invention, the solder strip with thickened solder spots and high solder spot thickened position precision can be manufactured, so that the contact resistance between the solder strip and a battery piece is reduced.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic cell technology, and in particular to a welding strip preparation device and a welding strip. Background Art

[0002] At present, when solar cells are produced, thinner soldering ribbons are usually used to reduce the shading area of ​​the soldering ribbons, resulting in a smaller contact area between the soldering ribbons and the fine grid welding points of the battery cells, and a larger contact resistance between the soldering ribbons and the battery cells, which limits the efficiency of the battery cells. In addition, the thinner soldering ribbons have a smaller welding area with the battery cells, lower welding strength, reduced pulling force, and lower yield during the welding process.

[0003] Therefore, there is an urgent need to develop a soldering ribbon and a soldering ribbon preparation device to prepare a soldering ribbon that can reduce the contact resistance between the soldering ribbon and the battery cell and is easy to process. Utility Model Content

[0004] The purpose of the present application is to provide a solder strip preparation device and a solder strip, which can produce a solder strip with thickened solder joints and high solder joint position accuracy, thereby reducing the contact resistance between the solder strip and the battery cell.

[0005] On the one hand, an embodiment of the present application provides a device for preparing a welding strip, including a base, the base is concave to form a solution tank; a rotating member, which can rotate in the solution tank with a rotating connector of the base, and the outer periphery of the rotating member is provided with a clamping groove along the circumference of the rotating member, and the clamping groove is used to set a substrate for the welding strip, and during the rotation of the rotating member, the substrate is brought into contact with the solution set in the solution tank so that the solution is coated on the surface of the substrate to form a coating located on the outer periphery of the substrate; and a plurality of widening portions are arranged at intervals along the circumferential direction on the clamping groove, so that the solution is accumulated and solidified at the widening portion to form a welding point portion protruding relative to the coating.

[0006] As an implementable manner, a plurality of clamping grooves are provided on the outer circumference of the rotating member, and the plurality of clamping grooves are arranged in parallel.

[0007] As an practicable manner, the welding strip preparation device further includes a transfer member, which is arranged around the outer periphery of the rotating member and is detachably connected to the rotating member, and the clamping groove is opened on the surface of the transfer member.

[0008] As an implementable manner, a groove is provided on the outer periphery of the rotating member, and the adapter is disposed in the groove so that the outer surfaces of the adapter and the rotating member are flush.

[0009] As an implementable manner, a limiting structure is provided between the adapter and the rotating member to limit the relative sliding of the adapter and the rotating member.

[0010] As an implementable manner, the adapter is a long flexible structure, and connecting mechanisms are provided at both ends of the adapter, and the connecting mechanisms at both ends are connected to each other so as to set the adapter on the periphery of the rotating member.

[0011] As an implementable manner, the rotating member is in the shape of a cylindrical tube, the clamping groove is arranged on the cylindrical surface of the rotating member, and the diameter of the rotating member is greater than 1m.

[0012] As an practicable manner, the cross section of the clamping groove along the radial direction of the rotating member is semicircular or rectangular.

[0013] As an implementable manner, bearings are provided on two opposite side walls of the base, a rotating shaft is provided on the rotating member, and two ends of the rotating shaft are respectively connected to the bearings so that the rotating member can rotate relative to the base.

[0014] On the other hand, an embodiment of the present application provides a solder strip, which is prepared using the above-mentioned solder strip preparation device. The solder strip includes a substrate and a coating coated on the outer periphery of the substrate. The substrate is strip-shaped, and a plurality of relatively protruding solder joints are arranged at intervals on the surface of the coating. The solder joints are used to connect with the soldering points on the photovoltaic cell.

[0015] The beneficial effects of the embodiments of the present application include:

[0016] The welding strip preparation device provided by the present application includes a base and a rotating part rotatably connected to the base. The base is concave to form a solution tank, and the solution tank contains a solution. The rotating part rotates in the solution tank. The outer periphery of the rotating part is provided with a clamping groove along the circumference of the rotating part. The clamping groove is used to set a substrate for the welding strip. When the rotating part rotates relative to the base, it drives the substrate set in the clamping groove to rotate, and makes the substrate contact with the solution set in the solution tank. The solution is coated on the surface of the substrate and solidified on the outer periphery of the substrate to form a coating. At the same time, a plurality of widening parts are arranged at intervals along the circumference of the clamping groove, so that the solution accumulates at the widening part. The liquid accumulated at the widening part leaves the solution as the rotating part and solidifies to form a welding point part connected to the coating, thereby forming a welding strip with a protrusion. The welding strip preparation device of the present application can realize the preparation of the welding strip during the rotation of the rotating part. It is convenient and quick, and can prepare the welding strip with higher efficiency, thereby improving the preparation efficiency of the welding strip.

[0017] The soldering strip provided in the present application comprises a substrate, a coating and a soldering point portion coated on the periphery of the substrate, wherein the soldering point portion can be used to connect with the soldering point of the photovoltaic cell, that is, the soldering point portion serves as the soldering point connecting the soldering strip and the cell, and the soldering point portion has a wider width relative to the substrate, so that the soldering point of the soldering strip provided in the embodiment of the present application is thickened, and the position accuracy of the thickened soldering point is high, wherein the substrate has a thinner diameter, so that the soldering strip can reduce the shading area, and the soldering point portion has a larger diameter, which increases the contact area between the soldering strip and the cell, thereby reducing the contact resistance between the soldering strip and the cell, and ensuring the welding strength while reducing the shading area. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a welding strip preparation device provided in an embodiment of the present application;

[0020] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 One of the structural schematic diagrams of a transition piece provided in an embodiment of the present application;

[0022] Figure 4 A second structural schematic diagram of an adapter provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of a welding strip provided in an embodiment of the present application.

[0024] Icons: 10-welding strip preparation device; 11-base; 111-solution tank; 12-rotating part; 121-clamping groove; 122-widening part; 123-rotating shaft; 124-bearing; 13-adapter; 20-welding strip; 21-welding point part; 22-substrate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] At present, when solar cells are produced, thinner welding ribbons are usually used to reduce the shading area, resulting in a smaller contact area between the welding ribbon and the fine grid welding point of the cell, a lower welding yield, and thus poor current collection effect, which limits the efficiency of the cell.

[0027] The present application provides a welding strip preparation device 10, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a base 11 and a rotating member 12 rotatably connected to the base 11, the base 11 is concave to form a solution tank 111, the rotating member 12 rotates in the solution tank 111, and a clamping groove 121 is opened on the outer periphery of the rotating member 12 along the circumference of the rotating member 12, and the clamping groove 121 is used to set the substrate 22 of the welding strip. During the rotation of the rotating member 12, the substrate 22 is brought into contact with the solution set in the solution tank 111 so that the solution is coated on the surface of the substrate 22 to form a coating located on the outer periphery of the substrate 22, and a plurality of widening portions 122 are arranged on the clamping groove 121 at intervals along the circumferential direction, so that the solution is accumulated and solidified at the widening portion 122 to form a welding point portion 21 connected to the substrate 22.

[0028] The welding strip preparation device 10 provided in the embodiment of the present application is used to prepare the welding strip 20, specifically, to coat the substrate 22 with a coating and form the welding spot portion 21. More specifically, the substrate 22 is disposed in the clamping groove 121, such as Figure 1 As shown, when the rotating member 12 rotates clockwise, the substrate 22 rotates with the rotation of the rotating member 12, and contacts with the solution set in the solution tank 111 during the rotation process, so that the solution is wrapped around the periphery of the substrate 22. When the substrate 22 moves to leave the solution, the solution wrapped around the periphery of the substrate 22 solidifies to form a coating. At the same time, during the rotation of the rotating member 12, the widening portion 122 rotates, and when the widening portion 122 is immersed in the solution, the solution fills the widening portion 122. When the widening portion 122 leaves the solution, the solution located at the widening portion 122 solidifies to form a welding point portion 21. The welding point portion 21 is arranged at intervals on the clamping groove 121, and the substrate 22 is arranged in the clamping groove 121, so that the welding point portion 21 is connected to the substrate 22, thereby forming a welding point portion 21 with a larger cross-sectional area on the substrate 22. The welding strip preparation device of the present application can realize the preparation of the welding strip during the rotation of the rotating member, which is convenient and quick, and can prepare the welding strip with higher efficiency, thereby improving the preparation efficiency of the welding strip.

[0029] The welding strip 20 prepared by the welding strip preparation device 10 provided in the embodiment of the present application has a welding spot portion 21 with a large cross-sectional area. When the welding strip 20 is connected to the grid line structure of the battery cell, the grid line structure has a plurality of connection points arranged in a matrix, and the welding spot portion 21 of the welding strip 20 is connected to a row of connection points of the grid line structure. Due to the presence of the welding spot portion 21, when the welding strip 20 is connected to the connection point, the contact area between the welding strip 20 and the connection point is increased, thereby reducing the contact resistance between the welding strip 20 and the battery cell.

[0030] In addition, in the solder strip preparation device 10 provided in the embodiment of the present application, the widening portion 122 is arranged at intervals on the clamping groove 121, so that the position of the widening portion 122 is more precise, and during the preparation process of the solder strip 20, the position accuracy of the solder joint portion 21 is higher.

[0031] In summary, the solder strip preparation device 10 provided in the embodiment of the present application can produce a solder strip 20 with thickened solder joints and high position accuracy of the thickened solder joints, thereby reducing the contact resistance between the solder strip 20 and the battery cell.

[0032] The embodiments of the present application do not limit the substrate 22 and the solution in the solution tank 111. For example, the substrate 22 may be copper, and the solution may be aluminum, silver, or tin, etc.

[0033] In addition, if Figure 1 As shown, in order to continuously coat the substrate 22 with a coating and set the welding spot portion 21, the substrate 22 is set in the portion in the rotation cycle of the rotating member 12. When the solution wrapped on the substrate 22 is solidified, the substrate 22 is moved along the direction as shown in FIG. Figure 1 The welding strip 20 is pulled outward in the X direction to realize the collection of the welding strip 20.

[0034] The welding strip preparation device 10 provided in the present application includes a base 11 and a rotating member 12 rotatably connected to the base 11. The base 11 is concave to form a solution tank 111, and the solution tank 111 contains a solution. The rotating member 12 rotates in the solution tank 111. The outer periphery of the rotating member 12 is provided with a clamping groove 121 along the circumference of the rotating member 12. The clamping groove 121 is used to set a substrate 22. When the rotating member 12 rotates relative to the base 11, the substrate 22 set in the clamping groove 121 is driven to rotate, and the substrate 22 is brought into contact with the solution set in the solution tank 111. The solution is coated on the surface of the substrate 22 and solidified on the surface of the substrate 22 to form a coating. At the same time, the clamping groove 121 has a plurality of spaced-apart widening portions 122, so that the solution in the solution tank 111 is accumulated at the widening portion 122. When the accumulated liquid leaves the solution along with the rotating member 12 or solidifies, a welding point portion 21 connected to the substrate 22 is formed. The solder joint portion 21 serves as a solder joint connecting the solder strip 20 and the battery cell. The solder joint portion 21 has a wider width relative to the substrate 22, so that the solder strip preparation device 10 provided in the embodiment of the present application can produce a solder strip 20 with thickened solder joints and high position accuracy of the thickened solder joints, thereby increasing the contact area between the solder strip 20 and the battery cell, thereby reducing the contact resistance between the solder strip 20 and the battery cell.

[0035] Optional, such as Figure 4 As shown, a plurality of clamping grooves 121 are provided on the outer periphery of the rotating member, and the plurality of clamping grooves 121 are arranged in parallel.

[0036] A plurality of clamping grooves 121 are provided, and substrates 22 are respectively provided in the plurality of clamping grooves 121 . Thus, during the rotation process, a coating can be applied to the plurality of substrates 22 and solder joints 21 can be formed at the same time, thereby improving the preparation efficiency of the solder strip 20 .

[0037] Specifically, those skilled in the art can set the number of the clamping grooves 121 according to actual conditions. For example, Figure 4 As shown, the clamping grooves 121 include three.

[0038] In one possible implementation of the embodiment of the present application, Figure 1 As shown, the welding strip preparation device 10 also includes an adapter 13 wound around the outer periphery of the rotating member 12, a clamping groove is provided on the adapter, and the adapter 13 and the rotating member 12 are detachably connected, and the clamping groove 121 is provided on the surface of the adapter.

[0039] In actual applications, there will be a variety of different battery cells. For different battery cells, the size of the welding strip 20 and the location of the welding point 21 are different. In order to improve the adaptability of the welding strip preparation device 10, the embodiment of the present application will set an adapter 13, and the clamping groove 121 is opened on the surface of the adapter 13. The welding strip preparation device 10 can be equipped with multiple adapters 13, and the size of the clamping groove 121 on each adapter 13 and the location of the widening part are set differently. In this way, when different welding strips 20 need to be prepared, only the adapter 13 needs to be replaced. Setting the clamping groove 121 on the adapter 13, and setting the adapter 13 on the rotating member 12 can improve the adaptability of the welding strip preparation device 10, so that the same welding strip preparation device 10 can prepare a variety of different welding strips 20.

[0040] Optionally, the connection method between the adapter 13 and the rotating member 12 is not limited in the embodiment of the present application. For example, Figure 3 and Figure 4 As shown, the adapter 13 is a long strip of flexible structure, and connecting mechanisms are respectively provided at both ends of the adapter 13. When disassembly is required, the connection of the connecting mechanisms at both ends of the adapter 13 is disconnected to remove the adapter 13 from the rotating member 12; when installation is required, the adapter 13 is set on the outer periphery of the rotating member 12, and the connecting mechanisms at both ends of the adapter 13 are connected to connect the adapter 13 to the rotating member 12.

[0041] It can be understood that when the adapter 13 is installed on the rotating member 12, it is cylindrical; when the adapter 13 is not installed on the rotating member 12, it is long and narrow, that is, the adapter 13 has plasticity.

[0042] Optionally, a groove is opened on the outer periphery of the rotating member 12, and the adapter 13 is arranged in the groove so that the outer surfaces of the adapter 13 and the rotating member 12 are flush. On the one hand, the groove has a certain limiting effect on the adapter 13 to prevent the adapter from separating from the rotating member 12; on the other hand, the outer surface of the rotating member 12 is relatively flat when it rotates, which is convenient for operation.

[0043] The specific size of the groove is not limited in the embodiment of the present application, and those skilled in the art can set it according to the size of the adapter 13. For example, the groove width of the groove is between 10-30 mm, and the groove depth of the groove is between 5-20 mm. The adapter 13 corresponds to it, that is, the width of the adapter 13 is between 10-30 mm.

[0044] In one achievable manner of the embodiment of the present application, a limiting structure is provided between the adapter 13 and the rotating member 12 to limit the relative sliding of the adapter 13 and the rotating member 12 .

[0045] In order to avoid the relative sliding of the adapter 13 with respect to the rotating part 12, which makes the rotation speed of the adapter 13 and the rotating part 12 different, and thus makes the contact time of the substrate 22 with the solution different, resulting in uneven coating thickness, a limiting structure is provided between the adapter 13 and the rotating part 12 in the embodiment of the application. The limiting structure limits the relative sliding of the adapter 13 and the rotating part 12, so that the rotation of the adapter 13 and the rotating part 12 are the same, thereby improving the uniformity of the coating thickness.

[0046] Optionally, the limiting structure includes a limiting protrusion disposed in the groove, and the limiting protrusion abuts against the adapter 13 to limit the movement of the adapter 13 relative to the rotating member 12 .

[0047] Specifically, the limiting structure includes a limiting protrusion arranged in the groove, and a friction portion or a pit is arranged on the adapter 13 corresponding to the limiting protrusion. The limiting protrusion abuts against the friction portion or the pit to achieve the abutment between the limiting protrusion and the adapter 13, thereby avoiding the relative sliding of the adapter 13 with respect to the rotating member 12.

[0048] It can be understood that the limiting protrusion is used to abut against the adapter 13. The adapter 13 is arranged in the groove, and the clamping groove 121 on the adapter 13 faces the direction away from the rotating member 12. Therefore, the limiting protrusion is arranged on the side wall on one side of the groove, so that the adapter 13 approaches and abuts against the side wall on the other side of the groove, thereby fixing the adapter 13.

[0049] In one possible implementation of the embodiment of the present application, Figure 1 As shown, the rotating member 12 is in the shape of a cylinder, the clamping groove 121 is arranged on the cylindrical surface of the rotating member, and the diameter of the rotating member is greater than 1m.

[0050] The diameter of the rotating part is set to be greater than 1m, so that the diameter of the rotating part is larger. In this way, when the base 22 is set in the clamp groove, the curvature radius of the bending is larger and the degree of bending is smaller, thereby avoiding damage to the welding strip 20 caused by excessive bending of the base 22.

[0051] Optionally, the cross-section of the clamping groove 121 along the radial direction of the cylinder is semicircular or rectangular.

[0052] The cross section of the clamping groove 121 matches the shape of the substrate 22. When the cross section of the substrate 22 is circular, the cross section of the clamping groove 121 is set to a semicircular shape. Half of the substrate 22 is set in the clamping groove 121, and the other half of the substrate 22 is surface coated. After the first surface coating is completed, the substrate 22 is set in the clamping groove 121 again for secondary coating. By analogy, the coating of the entire surface of the substrate 22 is achieved through multiple coatings. Specifically, the size of the semicircle is not limited in the embodiment of the present application. For example, the diameter can be 0.2-0.4 mm, which matches the diameter of the substrate 22 in the prior art, and the diameter of the widened portion is between 0.4-0.8 mm.

[0053] When the cross section of the substrate 22 is rectangular, the cross section of the clamping groove 121 is also set to be rectangular. The clamping groove 121 clamps half of the substrate 22, which is the same as the semicircular clamping groove 121. The surface of the substrate 22 is coated after multiple coatings.

[0054] In one possible implementation of the embodiment of the present application, Figure 1 As shown, bearings 124 are disposed on opposite side walls of the base 11 , and a rotating shaft 123 is disposed on the rotating member 12 . Both ends of the rotating shaft 123 are respectively connected to the bearings 124 so that the rotating member 12 can rotate relative to the base 11 .

[0055] The rotation of the rotating member 12 relative to the base 11 is achieved through the bearing 124 and the rotating shaft 123, which can make the rotation smooth and relatively easy to control, so that the rotation speed of the rotating member 12 is relatively stable, and the contact time between the substrate 22 and the solution is relatively fixed, so that the thickness of the coating is more uniform.

[0056] The present application also discloses a welding strip 20, which is prepared by using the welding strip preparation device 10. Figure 5 As shown, the solder strip includes a substrate 22 and a coating coated on the periphery of the substrate 22. The substrate 22 is strip-shaped, and a plurality of solder joints 21 are arranged at intervals on the surface of the coating. The solder joints 21 are used to connect with the solder joints on the battery cell.

[0057] The soldering point portion 21 has a larger cross-sectional area. When the soldering ribbon 20 is connected to the grid line structure of the battery cell, the grid line structure has a plurality of connection points arranged in a matrix, and the soldering point portion 21 of the soldering ribbon 20 is connected to a row of connection points of the grid line structure. Due to the presence of the soldering point portion 21, when the soldering ribbon 20 is connected to the connection point, the contact area between the soldering ribbon 20 and the connection point is increased, thereby reducing the contact resistance between the soldering ribbon 20 and the battery cell.

[0058] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A welding strip preparation device, characterized in that: include: A base, wherein the base is concave to form a solution tank; A rotating member, rotatably connected to the base and capable of rotating in the solution tank; A clamping groove is provided on the outer periphery of the rotating member along the circumferential direction of the rotating member, and a substrate of the welding strip is arranged in the clamping groove. During the rotation of the rotating member, the substrate is contacted with the solution arranged in the solution tank so that the solution is coated on the surface of the substrate to form a coating located on the outer periphery of the substrate; Furthermore, a plurality of widening portions are arranged at intervals along the circumferential direction on the clamping groove, so that the solution is accumulated and solidified at the widening portions to form a welding point portion protruding relative to the coating.

2. The welding strip preparation device according to claim 1, characterized in that: A plurality of the clamping grooves are provided on the outer circumference of the rotating member, and the plurality of the clamping grooves are arranged in parallel.

3. The welding strip preparation device according to claim 1, characterized in that: It also includes an adapter, which is arranged around the outer periphery of the rotating member and is detachably connected to the rotating member, and the clamping groove is opened on the surface of the adapter.

4. The welding strip preparation device according to claim 3, characterized in that: A groove is formed on the outer periphery of the rotating member, and the adapter is arranged in the groove so that the outer surfaces of the adapter and the rotating member are flush.

5. The welding strip preparation device according to claim 4, characterized in that: A limiting structure is arranged between the adapter and the rotating member to limit the relative sliding of the adapter and the rotating member.

6. The welding strip preparation device according to claim 4, characterized in that: The adapter is a long strip-shaped flexible structure, and connecting mechanisms are arranged at both ends of the adapter. The connecting mechanisms at both ends are connected to each other so as to arrange the adapter on the outer periphery of the rotating member.

7. The welding strip preparation device according to any one of claims 1 to 6, characterized in that: The rotating member is in the shape of a cylindrical tube, the clamping groove is arranged on the cylindrical surface of the rotating member, and the diameter of the rotating member is greater than 1m.

8. The welding strip preparation device according to any one of claims 1 to 6, characterized in that: The cross section of the clamping groove along the radial direction of the rotating member is semicircular or rectangular.

9. The welding strip preparation device according to any one of claims 1 to 6, characterized in that: Bearings are arranged on two opposite side walls of the base, and the rotating member is provided with a rotating shaft, and two ends of the rotating shaft are respectively connected to the bearings to enable the rotating member to rotate relative to the base.

10. A welding strip, characterized in that: The welding strip is prepared by using the welding strip preparation device described in any one of claims 1-9, the welding strip comprises a substrate and a coating coated on the periphery of the substrate, the substrate is strip-shaped, and a plurality of relatively protruding welding points are arranged at intervals on the surface of the coating, and the welding points are used to connect with welding points on photovoltaic cells.

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