Solder strip, photovoltaic module and photovoltaic system

Abstract

The utility model is suitable for the field of photovoltaic technology, and provides a solder strip, a photovoltaic assembly and a photovoltaic system. The welding strip comprises a plurality of protrusions arranged in the first direction, the protrusions stretch out in the second direction, the protrusions are elastic and can at least partially retract in the second direction, the protrusions are conductive, the first direction is the extension direction of the welding strip, and the first direction and the second direction intersect. Thus, when the height difference in the second direction is generated between the battery pieces or the insulating parts, the solder strip is provided with the arranged protrusions, the protrusions can retract in the second direction to connect parts at different positions in the second direction, it is avoided that a large amount of solder paste is used for filling the height difference, the use amount of the solder paste of the solder strip can be saved, and the production efficiency is improved. Therefore, the welding tension of the solder strip can be improved while the solder paste dosage is not increased, and the preparation method is simple.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaics, and in particular relates to a welding strip, a photovoltaic component and a photovoltaic system. Background Art

[0002] With the development of battery technology, interdigitated back contact (IBC) batteries have the advantages of no grid lines blocking the front light-receiving surface and higher battery efficiency, and have attracted more and more attention and technical research and development investment from the industry. However, this type of battery that requires solder ribbon welding packaging has insulating glue set at intervals when the solder ribbon contacts different grid lines, resulting in a height difference between the joints with and without insulating glue. In order to make the thin grid without insulating glue contact the solder ribbon normally, more solder paste is often needed, and the flux in the solder paste will damage the battery components. Utility Model Content

[0003] The utility model provides a soldering strip, which aims to solve the problem that different parts of a battery cell have height differences, resulting in a large amount of solder paste waste when attaching the soldering strip.

[0004] An embodiment of the utility model is implemented as follows: the utility model provides a welding strip, comprising a plurality of protrusions arranged along a first direction, the protrusions extending along a second direction, the protrusions having elasticity and capable of at least partially retracting in the second direction, the protrusions being conductive, wherein the first direction is an extension direction of the welding strip, and the first direction and the second direction intersect.

[0005] Furthermore, the welding strip further includes a main body portion extending along the first direction, and the protrusions all extend from the main body portion along the second direction.

[0006] Furthermore, the main body is in a strip shape, the main body includes two opposite sides, and the protrusions are all connected to one side of the main body.

[0007] Furthermore, adjacent protrusions are arranged at intervals.

[0008] Furthermore, the protrusion is connected to the adjacent protrusion.

[0009] Furthermore, the protrusion is in a wave shape.

[0010] Furthermore, the protrusion is in a sawtooth shape, and the tip angle of the protrusion is less than or equal to 90°.

[0011] The utility model also provides a photovoltaic module, comprising a welding strip as described in any of the above embodiments, wherein the photovoltaic module also includes adjacent first and second battery cells, the welding strip is located on the same side of the first and second battery cells, and the welding strip is electrically connected to the first and second battery cells, respectively.

[0012] Furthermore, the first cell and the second cell each include a plurality of fine grids arranged in parallel along the first direction, the fine grids include a first fine grid and a second fine grid, and along the first direction, the first fine grid and the second fine grid are alternately arranged, wherein the polarity of the first fine grid is opposite to the polarity of the second fine grid;

[0013] At least part of the protrusions are electrically connected to the plurality of the first fine grids of the first battery cell, and an insulating component is provided between the welding strip and the plurality of the second fine grids of the first battery cell;

[0014] At least part of the protrusions are electrically connected to the plurality of second fine grids of the second battery cell, and the insulating component is provided between the welding strip and the plurality of first fine grids of the second battery cell.

[0015] Furthermore, the insulating component can abut against the protrusion to at least partially retract along the second direction, and a retractable length of the protrusion in the second direction is greater than a length of the insulating component in the second direction.

[0016] Furthermore, the protrusions also include a first protrusion and a second protrusion alternately arranged, the first protrusion is used to connect with the fine grid, the second protrusion is used to connect with the insulating component, and in the second direction, the extending length of the first protrusion is greater than the extending length of the second protrusion.

[0017] Furthermore, the soldering strip further comprises a plurality of avoidance portions, each of which is arranged between the first protrusion and the second protrusion, and the avoidance portion is directly opposite to a position between the fine grid and the insulating component.

[0018] The utility model also provides a photovoltaic system, comprising the photovoltaic assembly as described in any one of the above embodiments.

[0019] In the welding strip, photovoltaic module and photovoltaic system of the embodiment of the present application, the welding strip includes a plurality of protrusions arranged along the first direction, the protrusions extend along the second direction, the protrusions are elastic and can be at least partially retracted in the second direction, and the protrusions are conductive, wherein the first direction is the extension direction of the welding strip, and the first direction and the second direction intersect. In this way, when a height difference in the second direction is generated between the battery cells or the insulating components, the welding strip has arranged protrusions, and the protrusions can be retracted along the second direction to connect components at different positions in the second direction, avoiding the use of a large amount of solder paste to fill the height difference, and can save the amount of solder paste used for the welding strip, so that the welding tension of the welding strip can be increased without increasing the amount of solder paste used, and the preparation method is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of a welding strip provided in an embodiment of the utility model;

[0021] Figure 2 is another cross-sectional view of the welding strip provided by the embodiment of the utility model;

[0022] Figure 3 It is another cross-sectional view of the welding strip provided by the embodiment of the utility model;

[0023] Figure 4 is another cross-sectional view of the welding strip provided by the embodiment of the utility model;

[0024] Figure 5 is another cross-sectional view of the welding strip provided by the embodiment of the utility model;

[0025] Figure 6 It is a plan view of a photovoltaic module provided by an embodiment of the utility model;

[0026] Figure 7 It is a module diagram of a photovoltaic system provided by an embodiment of the utility model.

[0027] Description of Figure Numbers:

[0028] 100, welding strip; 10, protrusion; 11, first protrusion; 12, second protrusion; 20, main body; 30, avoidance part; 200, photovoltaic module; 210, first battery cell; 220, second battery cell; 230, fine grid; 231, first fine grid; 232, second fine grid; 240, insulating component; 300, photovoltaic system. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] The embodiment of the utility model provides a welding strip, a photovoltaic module and a photovoltaic system, wherein the welding strip includes a plurality of protrusions arranged along a first direction, the protrusions extend along a second direction, and the protrusions are elastic and can at least partially retract in the second direction. In this way, when a height difference in the second direction is generated between the battery cells or the insulating components, the components at a higher position can resist the protrusions and retract along the second direction, and the components at a lower position can be connected through the protrusions, avoiding the use of a large amount of solder paste to fill the height difference, and saving the amount of solder paste for the welding strip. In this way, the welding tension of the welding strip can be increased without increasing the amount of solder paste, and the preparation method is simple.

[0031] Embodiment 1

[0032] Reference Figure 1 and Figure 2 This embodiment provides a solder strip 100, including a plurality of protrusions 10 arranged along a first direction, the protrusions 10 extending along a second direction, the protrusions 10 having elasticity and capable of at least partially retracting in the second direction, the protrusions 10 being conductive, wherein the first direction is an extension direction of the solder strip 100, and the first direction and the second direction intersect.

[0033] In this embodiment, the soldering ribbon 100 is used in the connection of the battery cell, and the protrusion 10 extending from the soldering ribbon 100 is solder paste. In addition, in the embodiment of the present application, the type and application scenario of the battery cell and the soldering ribbon 100 are not limited to meet different needs. For example, the soldering ribbon 100 of this embodiment can be applied to a busbar-free battery cell (0BB solder-free battery cell), and then soldered on the back of the battery cell to connect the batteries in series to form a component string.

[0034] In addition, in the embodiment of the present application, the intersection angle of the first direction and the second direction is not limited to meet various requirements. In this embodiment, the first direction and the second direction can be perpendicular to each other, so that a row of protrusions 10 can extend along a direction perpendicular to the first direction, thereby extending the protrusions 10 to the maximum extent under the premise of using the least solder paste.

[0035] Embodiment 2

[0036] Reference Figure 1 On the basis of the above-mentioned first embodiment, the second embodiment of the present invention provides a soldering strip 100, wherein the soldering strip 100 further includes a main body portion 20 extending along a first direction, and the protrusions 10 all extend from the main body portion 20 along a second direction.

[0037] In this embodiment, the protrusion 10 is extended along the second direction with the main body 20 as the "root", so that the structure of the solder strip 100 is more complete and strong. The main body 20 provides the main support and connection point for welding, and at the same time serves as the base of the protrusion 10 made of solder paste to ensure the stability of the structure of the protrusion 10, while the protrusion 10 plays the role of auxiliary support and connection. The length of the protrusion 10 extending relative to the main body 20 along the second direction is also consistent, which helps to enhance the stability and reliability of the solder strip 100 and ensure the firmness and durability of the solder connection.

[0038] Please combine Figure 2 In other embodiments, the welding strip 100 may also remove the main body 20 and achieve connection only by arranging the protrusions 10 on the battery cell along the first direction.

[0039] Embodiment 3

[0040] Reference Figure 1 and Figure 3 On the basis of the above-mentioned second embodiment, the third embodiment of the present utility model provides a welding strip 100 , wherein the main body 20 is in a strip shape, the main body 20 includes two opposite sides, and the protrusions 10 are all connected to one side of the main body 20 .

[0041] In this embodiment, the main body 20 of the welding strip 100 is in the shape of a strip and includes two opposite surfaces, and the protrusions 10 are all connected to one side of the main body 20, so that the protrusions 10 are all formed on the side of the welding strip 100 close to the battery cell. Since the strip-shaped main body occupies less space, it can be more closely attached to the battery cell. This layout not only helps to minimize the overall space occupied by the welding strip 100, but also ensures the stability and reliability of welding.

[0042] Embodiment 4

[0043] Reference Figure 4 On the basis of the above-mentioned third embodiment, the fourth embodiment of the present invention provides a welding strip 100, wherein adjacent protrusions 10 are arranged at intervals.

[0044] In this embodiment, intervals are provided between adjacent protrusions 10 in the solder strip 100 so that adjacent protrusions 10 are separated from each other, which not only ensures the firmness of the connection but also further reduces the amount of solder paste used.

[0045] Embodiment 5

[0046] Reference Figure 1 On the basis of the above-mentioned third embodiment, the fourth embodiment of the present invention provides a welding strip 100 , wherein the protrusions 10 are connected to adjacent protrusions 10 .

[0047] In this embodiment, the protrusions 10 are connected to adjacent protrusions 10 , so that there is a certain degree of adhesion between the adjacent protrusions 10 , making the protrusions 10 of the soldering strip 100 more uniform, and further enhancing the stability of the soldering strip 100 .

[0048] Of course, based on the above fourth and fifth embodiments, some protrusions 10 in the welding strip 100 can be arranged at intervals, and some protrusions 10 can be connected together, which is not specifically limited here, so as to meet different needs.

[0049] Embodiment 6

[0050] Reference Figure 5 Based on the fourth embodiment, the fifth embodiment of the present invention provides a welding strip 100, wherein the protrusion 10 is in a wave shape.

[0051] In this embodiment, the wave crest is the top of the protrusion 10 away from the main body 20, and no solder paste is provided in the wave trough, which can further save the amount of solder paste. At the same time, part of the wavy protrusion 10 can be held back by the insulating component 240 on the battery cell, and part of the wavy protrusion 10 can extend to connect the fine grid 230.

[0052] Embodiment 7

[0053] Reference Figure 1-Figure 4 On the basis of the above-mentioned fourth embodiment, the sixth embodiment of the utility model provides a welding strip 100, wherein the protrusion 10 is in a sawtooth shape, and the tip angle of the protrusion 10 is less than or equal to 90°. For example, the tip angle of the protrusion 10 can be 20°, 30°, 40°, 45°, 50°, 60°, 70°, 80°, or 90°.

[0054] In this embodiment, the sawtooth shape can make the protrusion 10 extend longer, the free space between different protrusions 10 is larger, and the amount of solder paste used is less. At the same time, the tip of the protrusion 10 is a right angle or an acute angle, so that the sawtooth-shaped protrusion 10 has better retraction performance, a longer retraction stroke, and is easier to be compressed.

[0055] Embodiment 8

[0056] Reference Figure 6 The utility model also provides a photovoltaic module 200, including the welding strip 100 as any of the above embodiments, the photovoltaic module 200 also includes a first battery cell 210 and a second battery cell 220 adjacent to each other, the welding strip 100 is located on the same side of the first battery cell 210 and the second battery cell 220, and the welding strip 100 is electrically connected to the first battery cell 210 and the second battery cell 220 respectively. In this way, the welding strip 100 can connect two battery cells together on the same side, and the space utilization rate is high.

[0057] Embodiment 9

[0058] Reference Figure 6 On the basis of the above-mentioned eighth embodiment, the ninth embodiment of the utility model provides a photovoltaic module 200, wherein the first battery cell 210 and the second battery cell 220 both include a plurality of fine grids 230 arranged in parallel along a first direction, the fine grids 230 include a first fine grid 231 and a second fine grid 232, and along the first direction, the first fine grids 231 and the second fine grids 232 are alternately arranged, wherein the polarity of the first fine grid 231 is opposite to the polarity of the second fine grid 232;

[0059] At least part of the protrusions 10 are electrically connected to the plurality of first fine grids 231 of the first battery cell 210 , and an insulating component 240 is provided between the welding ribbon 100 and the plurality of second fine grids 232 of the first battery cell 210 ;

[0060] At least part of the protrusions 10 are electrically connected to the plurality of second fine grids 232 of the second battery cell 220 , and an insulating component 240 is disposed between the welding ribbon 100 and the plurality of first fine grids 231 of the second battery cell 220 .

[0061] Specifically, by utilizing the poor mechanical strength of the sawtooth or wavy protruding structure, when subjected to lamination pressure, the tip of the protrusion 10 contacts the insulating component 240 and is flattened, and the tip of the adjacent part of the protrusion 10 can contact the battery cell fine grid 230, and the tin layer is melted to complete the welding with the fine grid 230.

[0062] In the implementation of the present application, the type of the insulating component 240 is not limited to meet different needs. For example, the insulating component 240 can be a block of insulating glue, and the height of the insulating glue relative to the fine grid 230 in the second direction can be 25μm-30μm. In addition, in this embodiment, the specific number of battery cells is not limited to meet different needs. For example, the welding strip 100 can connect multiple battery cells, and along the first direction, the first battery cell 210 and the second battery cell 220 are alternately arranged to form a photovoltaic module 200.

[0063] It can be understood that the first fine grid 231 can be a positive fine grid 230, and the second fine grid 232 can be a negative fine grid 230. When the welding strip 100 connects the first battery cell 210 and the second battery cell 220, the welding strip 100 is connected to the first fine grid 231 (positive fine grid 230) of the first battery cell 210 through the protrusion 10, and the welding strip 100 is connected to the second fine grid 232 (negative fine grid 230) of the second battery cell 220 through the protrusion 10, thereby realizing the electrical connection of the two battery cells. At the same time, the insulating component 240 can cover the second fine grid 232 on the first battery cell 210, and the insulating component 240 can also cover the first fine grid 231 on the second battery cell 220 to ensure that the connection between the two battery cells is stable.

[0064] Embodiment 10

[0065] Reference Figure 3 Based on the above-mentioned ninth embodiment, the tenth embodiment of the utility model provides a photovoltaic component 200, wherein the insulating component 240 can resist the protrusion 10 to at least partially retract along the second direction, and the length by which the protrusion 10 can be retracted in the second direction is greater than the length of the insulating component 240 in the second direction.

[0066] It should be noted that the length of the protrusion 10 of the solder strip 100 in the embodiment of the present application in the second direction is greater than the length of the insulating component 240 in the second direction, and the length of the elastic retraction of the protrusion 10 in the second direction is also greater than the length of the insulating component 240 in the second direction, so as to ensure the stable electrical connection between the fine grid 230 and the solder strip 100.

[0067] Embodiment 11

[0068] Reference Figure 3 On the basis of the above-mentioned ninth embodiment, the eleventh embodiment of the utility model provides a photovoltaic component 200, wherein the protrusion 10 also includes a first protrusion 11 and a second protrusion 12 alternately arranged, the first protrusion 11 is used to connect with the fine grid 230, and the second protrusion 12 is used to connect with the insulating component 240, and in the second direction, the length of the first protrusion 11 extending out is greater than the length of the second protrusion 12 extending out.

[0069] In this way, the second protrusion 12 has a smaller extension distance, and the amount of solder paste can be further reduced without increasing the preparation steps. At the same time, the problem of the height of the solder strip 100 being too high at this position after the insulating component 240 is connected to the second protrusion 12 is avoided, and the flatness of the solder strip 100 is ensured.

[0070] Embodiment 12

[0071] Reference Figure 3 On the basis of the above-mentioned eleventh embodiment, the twelfth embodiment of the present utility model provides a photovoltaic module 200, wherein the solder strip 100 further includes a plurality of avoidance portions 30, each of which is disposed between the first protrusion 11 and the second protrusion 12, and the avoidance portion 30 is directly opposite to the position between the fine grid 230 and the insulating component 240. In this way, the first protrusion 11 can extend to butt against the fine grid 230 of the cell, and the second protrusion 12 has a shorter extension distance to ensure that the insulating component 240 can be connected to the second protrusion 12 after pressing, and the avoidance portion 30 can further reduce the amount of solder paste used.

[0072] Embodiment 13

[0073] Reference Figure 7The utility model also provides a photovoltaic system 300, including a photovoltaic assembly 200 according to any of the above embodiments.

[0074] This embodiment provides a photovoltaic system 300, which directly converts sunlight into electrical energy through a solar panel (photovoltaic panel). The solar panel is usually composed of multiple silicon wafers or other semiconductor materials, which are not specifically limited here. The photovoltaic module 200 can be a solar panel, and the welding ribbon 100 can be arranged on the back side of the solar panel to avoid affecting the transmittance of sunlight.

[0075] In the welding strip, photovoltaic module and photovoltaic system of the embodiment of the present application, the welding strip includes a plurality of saw teeth arranged along the first direction, the saw teeth extend along the second direction, the saw teeth are elastic and can be at least partially retracted in the second direction, and the saw teeth are conductive, wherein the first direction is the extension direction of the welding strip, and the first direction and the second direction intersect. In this way, when a height difference in the second direction is generated between the battery cells or the insulating components, the welding strip has arranged saw teeth, and the saw teeth can be retracted along the second direction to connect components at different positions in the second direction, avoiding the use of a large amount of solder paste to fill the height difference, and can save the amount of solder paste used for the welding strip, so that the welding tension of the welding strip can be increased without increasing the amount of solder paste used, and the preparation method is simple.

[0076] It is understandable that those skilled in the art can, under the guidance of the above embodiments, combine various implementation methods in the above embodiments to obtain technical solutions of multiple implementation methods.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding strip, characterized in that: It includes a plurality of protrusions arranged along a first direction, the protrusions extending along a second direction, the protrusions having elasticity and capable of at least partially retracting in the second direction, and the protrusions being conductive, wherein the first direction is the extension direction of the solder strip, and the first direction and the second direction intersect.

2. The welding strip according to claim 1, characterized in that The welding strip further includes a main body portion extending along the first direction, and the protrusions all extend from the main body portion along the second direction.

3. The welding strip according to claim 2, characterized in that The main body is in a strip shape and includes two opposite sides, and the protrusions are all connected to one side of the main body.

4. The welding strip according to claim 1, characterized in that Adjacent protrusions are arranged at intervals.

5. The welding strip according to claim 1, characterized in that The protrusions are connected to adjacent protrusions.

6. The welding strip according to claim 1, characterized in that The protrusion is in a wave shape.

7. The welding strip according to claim 1, characterized in that The protrusion is in a sawtooth shape, and the angle of the tip of the protrusion is less than or equal to 90°.

8. A photovoltaic module, characterized in that: Including the welding strip as described in any one of claims 1-7, the photovoltaic component also includes a first battery cell and a second battery cell adjacent to each other, the welding strip is located on the same side of the first battery cell and the second battery cell, and the welding strip is electrically connected to the first battery cell and the second battery cell respectively.

9. The photovoltaic module according to claim 8, characterized in that: The first cell and the second cell each include a plurality of fine grids arranged in parallel along the first direction, the fine grids include a first fine grid and a second fine grid, and along the first direction, the first fine grid and the second fine grid are alternately arranged, wherein the polarity of the first fine grid is opposite to the polarity of the second fine grid; At least part of the protrusions are electrically connected to the plurality of the first fine grids of the first battery cell, and an insulating component is provided between the welding strip and the plurality of the second fine grids of the first battery cell; At least part of the protrusions are electrically connected to the plurality of second fine grids of the second battery cell, and the insulating component is provided between the welding strip and the plurality of first fine grids of the second battery cell.

10. The photovoltaic module according to claim 9, characterized in that: The insulating member can abut against the protrusion to at least partially retract along the second direction, and a retractable length of the protrusion in the second direction is greater than a length of the insulating member in the second direction.

11. The photovoltaic module according to claim 9, characterized in that: The protrusions further include first protrusions and second protrusions that are alternately arranged, the first protrusions are used to connect with the fine grids, the second protrusions are used to connect with the insulating component, and in the second direction, the first protrusions extend longer than the second protrusions.

12. The photovoltaic module according to claim 11, characterized in that: The solder strip further includes a plurality of avoidance portions, each of which is disposed between the first protrusion and the second protrusion, and the avoidance portion is directly opposite to a position between the fine grid and the insulating component.

13. A photovoltaic system, characterized in that: Comprising a photovoltaic module as described in any one of claims 8 to 12.

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