Back contact cell, back contact cell string, solar cell module and photovoltaic power generation system
By designing a pre-defined area for solder paste printing on the grid line of the back contact cell without pads, the problem of inconsistent carrier transport distance is solved, the carrier transport path is shortened and losses are reduced, and the efficiency and cost-effectiveness of solar cells are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2026-03-20
AI Technical Summary
In back-contact solar cells, the transport distance of charge carriers from the fine grid lines to the pad points is inconsistent, resulting in significant transport losses, especially in the edge regions where the transport path is long and the losses are more pronounced.
Design a back-contact battery with grid lines on the back, including a first main grid line and a fine grid line for connection with solder ribbon. The grid lines have preset areas for printing solder paste without pads. By printing solder paste in the main grid line and fine grid line areas to form multiple contact points, the carrier transport path is shortened.
It effectively shortens the carrier transmission distance, significantly reduces transmission loss, saves slurry costs, reduces light shading, and improves conversion efficiency.
Smart Images
Figure CN224022165U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to solar cell technical field, specifically, especially, it relates to a back contact cell, back contact cell series, solar cell module, photovoltaic power generation system. BACKGROUND
[0002] In the back contact solar cell, the main grid, the fine grid line is usually cross arrangement, and the special-shaped main grid and the special-shaped fine grid line usually alternate arrangement, each main grid is equipped with Pad point, and the solder strip is connected with the cell through the Pad point, and the connection of the solder strip and the Pad point needs to form the electrical contact through the tin cream. In order to improve the collection efficiency of carrier, the fine grid line usually continues to the edge of the silicon wafer, and the edge carrier transmission path is long, and the loss is big.
[0003] The prior art has the following problems:
[0004] (1) the distance of the fine grid line carrier transmission to the Pad point is inconsistent between two Pad points, and the transmission distance of the fine grid line closer to the center of two Pad points is farther, and the transmission loss is greater.
[0005] (2) the distance of the fine grid line carrier transmission to the Pad point is inconsistent between two Pad points, and the transmission distance of the fine grid line closer to the center of two Pad points is farther, and the transmission loss is greater. UTILITY MODEL CONTENTS
[0006] The utility model wants to solve the technical problem in, provide a back contact cell, it can make the transmission distance be shorter when carrier collection, transmission loss is reduced significantly.
[0007] The utility model wants to solve the technical problem in, provide a back contact cell, it can make the transmission distance be shorter when carrier collection, transmission loss is reduced significantly.
[0008] In order to solve the above problem, the utility model provides a back contact cell, the back surface of the back contact cell is equipped with the grid line, the grid line includes the first main grid line for being connected with the solder strip, the first main grid line is equipped with a plurality of first preset areas for setting tin cream, and the first preset area is not provided with pad point.
[0009] In some embodiments, the first main grid line is the positive main grid line or the negative main grid line, and the first main grid line is not provided with pad point.
[0010] In some embodiments, the first main grid line extends along a first direction.
[0011] In the second direction, the width of the first preset area is less than the width of the first main grid line, and the second direction intersects the first direction.
[0012] In some embodiments, the first main grid line extends along a first direction.
[0013] In the second direction, the width of the first preset area is less than the width of the doped layer corresponding to the first main grid line, and the second direction intersects the first direction.
[0014] The first main grid line is provided with 5-30 first preset areas.
[0015] The interval distance of adjacent first preset areas in the first direction is 5-30 mm.
[0016] In some embodiments, the grid line includes a fine grid line, and the first main grid line is connected with the fine grid line at the intersection area.
[0017] The first preset area includes the intersection area, and / or a part area other than the intersection area.
[0018] In some embodiments, the first main grid line extends in the first direction.
[0019] The grid line further includes an edge fine grid, which is arranged between the edge of the back contact cell and the main grid closest to the edge of the back contact cell, and the edge fine grid is not electrically connected with the main grid. The edge fine grid includes a first fine grid and a second fine grid, and the first fine grid and the second fine grid extend in the second direction.
[0020] In the first direction, the second fine grid is between adjacent first fine grids, and the polarity of the first fine grid and the second fine grid is the same.
[0021] The first fine grid is provided with a second preset area for printing tin paste, and the second preset area is not provided with a pad point.
[0022] The second fine grid is not provided with a second preset area for printing tin paste.
[0023] In some embodiments, in the first direction, the size of the second preset area is less than the size of the doped layer corresponding to the first fine grid.
[0024] In some embodiments, the second fine grid is one fine grid located between adjacent first fine grids in the first direction.
[0025] Alternatively, the second fine grid is a plurality of fine grids located between adjacent first fine grids in the first direction.
[0026] In some embodiments, the edge fine grid further includes a third fine grid, and the third fine grid extends in the first direction.
[0027] And the third fine grid is connected with the first fine grid and the second fine grid.
[0028] In some embodiments, no pad point is provided on the first fine grid and the second fine grid.
[0029] The utility model also provides a back contact battery, the back surface of back contact battery is equipped with first fine grid, and second fine grid,
[0030] The second fine grid is between adjacent first fine grids in the first direction, and the first fine grid and the second fine grid have the same polarity.
[0031] The first fine grid and the second fine grid extend in the second direction.
[0032] The first fine grid is provided with a second preset area for printing tin paste, and no pad point is provided on the second preset area.
[0033] The second fine grid is not provided with a second preset area for printing tin paste.
[0034] In some embodiments, the first fine grid and the second fine grid are arranged at the edge of the back contact battery.
[0035] Accordingly, the utility model provides a back contact battery string, comprising a plurality of first back contact batteries as described above and a first solder strip.
[0036] The back contact battery string is provided with tin paste in the first preset area, and the first solder strip is welded to the back contact battery in the first preset area.
[0037] Accordingly, the utility model provides a back contact battery string, comprising a plurality of second back contact batteries as described above, a first solder strip and a second solder strip.
[0038] The back contact battery string is provided with tin paste in the first preset area and tin paste in the second preset area.
[0039] The first solder strip is welded to the back contact battery in the first preset area, and the second solder strip is welded to the back contact battery in the second preset area.
[0040] To solve the above problems, the utility model further provides a solar cell module comprising the back contact battery string as described above, and a photovoltaic power generation system comprising the solar cell module.
[0041] The utility model has the following beneficial effects:
[0042] The utility model discloses a back contact battery, the back of back contact battery is equipped with grid line, the grid line includes the first main grid line for connecting with solder strip, be equipped with a plurality of first preset area for setting the tin cream on the first main grid line, the first preset area is not set pad point. The utility model discloses printing tin cream in main grid area or fine grid area, to make main grid or fine grid and solder strip form a plurality of contact points, shorten the transmission path of carrier on the grid line, reduce transmission loss. BRIEF DESCRIPTION OF DRAWINGS
[0043] Figure 1 It is the structure schematic diagram of back contact battery provided by the utility model,
[0044] Figure 2 It is the structure schematic diagram of another back contact battery provided by the utility model,
[0045] Figure 3 It is the structure schematic diagram of back contact battery provided by the utility model with pad point. DETAILED DESCRIPTION
[0046] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following combines the drawings and example, and the utility model is further detailed. The example of the example is shown in the drawing, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar function throughout. The example described below by referring to the drawing is exemplary, and is only used to explain the utility model, and cannot be understood as the limitation of the utility model. In addition, it should be understood that the specific examples described herein are only used to explain the utility model, and cannot be used to limit the utility model.
[0047] In the description of the utility model, it is understood that the orientation or position relation of the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom" and the like is based on the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.
[0048] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "a plurality of" is two or more than two, unless otherwise specifically limited.
[0049] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "mount", "link", "connect" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect;Can be mechanical connection, also can be electric connection or can communicate with each other;It can be directly connected, also can be indirectly connected through intermediate medium, can be the communication of two elements or the interaction of two elements.For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.
[0050] In the utility model, unless there is definite stipulation and limitation, the first feature is "on" or "under" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through other features between them.In addition, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.The first feature "under", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.
[0051] The following disclosure provides many different embodiments or examples for implementing different structures of the utility model.For the purpose of simplifying the disclosure of the utility model, the components and settings of specific examples are described in the following text.Of course, they are only examples, and the purpose is not to limit the utility model.In addition, the utility model can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.In addition, the utility model provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.
[0052] In the utility model, "preferred", "better" is only to describe the better implementation mode or embodiment, and it should be understood that it does not constitute a limitation on the protection scope of the utility model.In the utility model, the technical features described in an open way include closed technical solutions composed of listed features, and also include open technical solutions containing listed features.In the utility model, when a numerical interval is involved, unless otherwise specified, it includes both endpoints of the numerical interval.
[0053] In existing technologies, the main grid and fine grids are arranged vertically, with irregularly shaped grid lines interleaved. The areas with irregularly shaped grid lines are covered with insulating adhesive to prevent short circuits. Current battery stringing processes involve printing insulating adhesive, printing solder paste, and soldering the solder ribbon. Solder paste is printed only at the pad positions, and the solder ribbon connects to the pad points via the solder paste. The portion of the main grid without pad points typically does not make electrical contact with the solder ribbon. The current flow direction is fine grid, main grid, and solder ribbon. This design results in inconsistent distances for charge carriers from the fine grid to travel between the two pad points; the fine grid closer to the center of the two pad points travels a longer distance, resulting in greater transmission losses.
[0054] This utility model provides a back contact battery, such as Figure 1 As shown, the back of the back contact battery is provided with grid lines. The grid lines include a first main grid line 100 for connecting with solder ribbon. The first main grid line 100 is provided with a plurality of first preset areas 300 for setting solder paste. The first preset areas 300 are not provided with pad points.
[0055] This invention prints solder paste in the main gate area or the fine gate area to form multiple contact points between the main gate or the fine gate and the solder ribbon, thereby shortening the carrier transport path on the gate line and reducing transmission loss.
[0056] In some implementations, the first main gate line 100 is a positive main gate line or a negative main gate line.
[0057] In some implementations, no pad points are provided on the first main grid line 100, such as... Figure 3 As shown in this application, pad point 800 refers to a point where the grid line suddenly widens. Not setting pad points on the first main grid line 100 can save slurry, reduce costs, and also reduce light shading, thus improving conversion efficiency.
[0058] Further, in some embodiments, the first main gate line 100 extends along a first direction; in a second direction, the width of the first preset region 300 is smaller than the width of the first main gate line 100, and the second direction intersects the first direction. In some embodiments, the first main gate line 100 extends along the first direction; in a second direction, the width of the first preset region 300 is smaller than the width of the doped layer corresponding to the first main gate line 100, and the second direction intersects the first direction. This not only ensures the welding pull between the solder strip and the main gate but also avoids short circuits between adjacent irregularly shaped gate lines.
[0059] In some embodiments, the first main grid line 100 is provided with 5-30 first preset areas 300; exemplary number of the first preset areas 300 is 10, 15, 20, 25, but is not limited to the above enumeration. In some embodiments, the interval distance of adjacent first preset areas 300 along the first direction is 5-30 mm; exemplary interval distance of adjacent first preset areas 300 along the first direction is 10 mm, 15 mm, 20 mm, 25 mm, but is not limited to the above enumeration. It can be understood that the number of the first preset areas 300 can be adjusted according to actual conditions, and the utility model does not make limitation to this. In addition, in some embodiments, the shape of the first preset area 300 is one or a combination of circular, elliptical, square or rectangular. It can be understood that the shape of the first preset area 300 can be adjusted according to actual conditions, and the utility model does not make limitation to this.
[0060] As shown in the drawings, in some embodiments, the plurality of positive fine grid lines and the plurality of negative fine grid lines are alternately and spacedly arranged in sequence, the positive fine grid lines and the negative fine grid lines are arranged in a finger-shaped cross manner, and the positive main grid lines and the negative main grid lines are spacedly arranged. Figure 1 The positive fine grid lines and the negative fine grid lines can be alternately and spacedly arranged along the second direction, the positive main grid lines and the negative main grid lines can be alternately and spacedly arranged along the first direction, and the positive solder strip and the negative solder strip can be alternately and spacedly arranged along the first direction, the first direction and the second direction are perpendicular to each other, the first direction can be the longitudinal direction of the back contact battery, and the second direction can be the transverse direction of the back contact battery, and the two are perpendicular to each other.
[0061] In some embodiments, the grid lines include fine grid lines, the first main grid line 100 is connected with the fine grid lines at the intersection area 200; the first preset area 300 is arranged at the intersection area 200; at this time, the transmission path of the carriers on the grid lines can be shortened to the greatest extent, and the transmission loss can be reduced. Alternatively, the first preset area 300 is arranged in a part of the area other than the intersection area 200; at this time, the transmission path of the carriers on the grid lines can be shortened to a certain extent, and the transmission loss can be reduced. Alternatively, the first preset area 300 is arranged in the intersection area 200 and a part of the area other than the intersection area 200; at this time, the transmission path of the carriers on the grid lines can be shortened to a greater extent, and the transmission loss can be reduced.
[0062] In the prior art, in order to improve the collection efficiency of the carriers, the fine grid usually extends to the edge of the silicon wafer, therefore, the utility model designs the following back contact battery, as shown in the drawings, Figure 2As shown, the back surface of the back contact cell is provided with a grid line, the grid line comprises a first main grid line 100 for connecting with a solder strip, the first main grid line 100 is provided with a first preset area 300 for setting tin paste, the first preset area 300 is not provided with a pad point;
[0063] The first main grid line 100 extends along a first direction;
[0064] The grid line further comprises an edge fine grid, the edge fine grid is arranged between the edge of the back contact cell and the main grid closest to the edge of the back contact cell, the edge fine grid is not electrically connected with the main grid, the edge fine grid comprises a first fine grid 400 and a second fine grid 500, the first fine grid 400 and the second fine grid 500 extend along a second direction;
[0065] The second fine grid 500 is between adjacent first fine grids 400 in the first direction, and the first fine grid 400 and the second fine grid 500 have the same polarity;
[0066] The first fine grid 400 is provided with a second preset area 600 for printing tin paste, the second preset area 600 is not provided with a pad point;
[0067] The second fine grid 500 is not provided with a second preset area 600 for printing tin paste.
[0068] In an embodiment, the positive main grid and the negative main grid are arranged at intervals along a first direction, the positive fine grid, the negative fine grid, the first fine grid 400 and the second fine grid 500 are arranged along a second direction, and the first direction intersects the second direction. The first direction and the second direction are perpendicular to each other, the first direction can be the longitudinal direction of the back contact cell, and the second direction can be the transverse direction of the back contact cell, and the two directions are perpendicular to each other. Preferably, the edge fine grid further comprises a third fine grid 700, the third fine grid 700 extends along the first direction; and the third fine grid 700 is connected with the first fine grid 400 and the second fine grid 500. The edge fine grid is arranged at the edge of the silicon wafer, so that the edge carriers can be collected, but the edge carrier transmission path is long and the loss is large. In the embodiment, by providing the second preset area 600 for printing tin paste on the first fine grid 400, and subsequently printing tin paste on the second preset area 600 and electrically connecting with the solder strip, the edge carrier transmission path can be shortened.
[0069] In an embodiment, neither the first fine grid 400 nor the second fine grid 500 is provided with a pad point, for example, Figure 3As shown, in the present application, the pad point 800 refers to the sudden widening of the gate line width at this point. The absence of pad points on the first fine gate 400 and the second fine gate 500 can save the paste, reduce the cost, and also reduce the light shielding and improve the conversion efficiency.
[0070] In an embodiment, the second fine gate 500 is one fine gate located between adjacent first fine gates 400 in the first direction; or the second fine gate 500 is a plurality of fine gates located between adjacent first fine gates 400 in the first direction. It can be understood that when the second fine gate 500 is one fine gate located between adjacent first fine gates 400 in the first direction, the solder strip is welded with the tin paste printed on the second preset area 600 on the first fine gate 400; when the second fine gate 500 is a plurality of fine gates located between adjacent first fine gates 400 in the first direction, the solder strip is welded with the tin paste printed on the second preset area 600 on the first fine gate 400. The number of first fine gates 400 can be adjusted according to actual conditions, and the present application does not limit this.
[0071] In some embodiments, the size of the second preset area 600 is smaller than the size of the doped layer corresponding to the first fine gate 400. In this way, not only can the welding tension of the solder strip and the main gate be ensured, but also short circuit between adjacent special-shaped gate lines can be avoided.
[0072] Correspondingly, the utility model also provides a back contact battery string, including:
[0073] The first back contact battery described above, and the first solder strip;
[0074] The back contact battery string is provided with tin paste on the first preset area 300, and the first solder strip is welded with the back contact battery on the first preset area 300.
[0075] Correspondingly, the utility model also provides a back contact battery string, including:
[0076] The second back contact battery, the first solder strip, and the second solder strip described above;
[0077] The back contact battery string is provided with tin paste on the first preset area 300 and the second preset area 600;
[0078] The first solder strip is welded with the back contact battery on the first preset area 300, and the second solder strip is welded with the back contact battery on the second preset area 600.
[0079] Correspondingly, the utility model also provides a solar cell module, including the back contact cell string described above. In some embodiments, the solar cell module includes a front plate, a front adhesive film, a back contact cell string, a back plate, and a back adhesive film connected in sequence.
[0080] In some embodiments, the front plate, such as photovoltaic glass, can be covered on the adhesive film on the front of the cell sheet. The front plate can be super white glass, which has high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, the light transmittance of super white glass can be more than 92%, which can protect the cell sheet without affecting its efficiency as much as possible.
[0081] Meanwhile, the front adhesive film can bond the front plate and the cell sheet together. The presence of the front adhesive film can seal, insulate, and prevent water and moisture from entering the cell sheet.
[0082] In some embodiments, the back plate can be attached to the adhesive film on the back of the cell sheet. The back plate can protect and support the cell sheet, has reliable insulation, water resistance, and aging resistance. The back plate can have multiple options, such as tempered glass, organic glass, aluminum alloy TPT composite adhesive film, KPC, CPC, etc. The specific configuration can be set according to the specific situation, which is not limited here. The whole composed of the back plate, the cell sheet, the adhesive film, and the front plate can be set on the metal frame. The metal frame serves as the main external support structure of the entire back contact cell module and can provide stable support and installation for the back contact cell module. For example, the metal frame can be used to install the back contact cell module at the desired installation location.
[0083] Meanwhile, the back adhesive film can bond the back plate and the cell sheet together. The presence of the adhesive film can seal, insulate, and prevent water and moisture from entering the cell sheet.
[0084] In addition, the utility model also provides a photovoltaic power generation system including the solar cell module. The photovoltaic power generation system can be applied in photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc. It can also be applied in devices or equipment that use solar energy to generate electricity, such as user solar power sources, solar street lamps, solar cars, solar buildings, etc. Of course, it can be understood that the application scenarios of the photovoltaic power generation system are not limited to this, that is, the photovoltaic power generation system can be applied in all fields that require solar power generation. Taking the photovoltaic power generation system network as an example, the photovoltaic power generation system can include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array can be an array combination of multiple cell modules 10. For example, multiple cell modules 10 can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can combine the current generated by the photovoltaic array. The combined current flows through the inverter to convert it into alternating current required by the power grid, and then connects to the power grid to realize solar power supply.
[0085] In the description of the specification, the description of the terms "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" and the like means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the application. The illustrative descriptions of such terms do not necessarily refer to the same embodiment or example, though they can. Furthermore, the description of specific features, structures, materials, or characteristics does not imply that these are absolute requirements and that a particular embodiment or example cannot incorporate features, structures, materials, or characteristics from other embodiments or examples.
[0086] The above only discloses a preferred embodiment of the utility model, of course cannot with this to limit the utility model right scope, therefore the equivalent change made by the utility model claim still belongs to the range covered by the utility model.
Claims
1. A back-contact battery, characterized in that, The back of the back contact battery is provided with grid lines, the grid lines include a first main grid line for connecting with solder ribbon, the first main grid line is provided with a plurality of first preset areas for setting solder paste, and the first preset areas are not provided with pad points.
2. The back contact battery as described in claim 1, characterized in that, The first main gate line is either a positive main gate line or a negative main gate line; No pad points are set on the first main grid line.
3. The back contact battery as described in claim 2, characterized in that, The first main gate line extends along the first direction; In the second direction, the width of the first preset area is smaller than the width of the first main grid line, and the second direction intersects with the first direction.
4. The back contact battery as described in claim 2, characterized in that, The first main gate line extends along the first direction; In the second direction, the width of the first preset region is smaller than the width of the doped layer corresponding to the first main gate line, and the second direction intersects with the first direction.
5. The back contact battery as described in claim 1, characterized in that, The first main grid line has 5 to 30 first preset areas; The distance between adjacent first preset areas along the first direction is 5mm to 30mm.
6. The back contact battery as described in claim 2, characterized in that, The grid lines include fine grid lines, and the first main grid line and the fine grid lines are connected in the intersection region; The first preset area includes the intersection area, and / or a portion of the area other than the intersection area.
7. The back contact battery as described in claim 1, characterized in that, The first main gate line extends along the first direction; The grid line also includes an edge grid, which is disposed between the edge of the back contact battery and the main grid closest to the edge of the back contact battery. The edge grid is not electrically connected to the main grid. The edge grid includes a first grid and a second grid, which extend in a second direction. In the first direction, the second fine gate is located between adjacent first fine gates, and the first fine gate and the second fine gate have the same polarity; The first fine grid has a second preset area for printing solder paste, and the second preset area has no pad points; The second fine grid does not have a second preset area for printing solder paste.
8. The back contact battery as described in claim 7, characterized in that, In the first direction, the size of the second preset region is smaller than the size of the doped layer corresponding to the first fine gate.
9. The back contact battery as described in claim 7, characterized in that, The second fine grid is a fine grid located between adjacent first fine grids in a first direction; Alternatively, the second fine grid may be a plurality of fine grids located between adjacent first fine grids in a first direction.
10. The back contact battery as described in claim 7, characterized in that, The edge grid further includes a third grid, which extends along a first direction; Furthermore, the third fine gate is connected to the first fine gate and the second fine gate.
11. The back contact battery as described in claim 7, characterized in that, Neither the first nor the second fine grid has pad points.
12. A back-contact battery, characterized in that, The back of the back contact battery is provided with a first fine grid and a second fine grid; In the first direction, the second fine gate is located between adjacent first fine gates, and the first fine gates and the second fine gates have the same polarity; Both the first and second fine gates extend in the second direction; The first fine grid has a second preset area for printing solder paste, and the second preset area has no pad points; The second fine grid does not have a second preset area for printing solder paste.
13. The back contact battery as described in claim 12, characterized in that, The first and second fine grids are disposed at the edge of the back contact battery.
14. A back-contact battery string, characterized in that, Includes multiple back contact batteries as described in any one of claims 1 to 6, and a first solder strip; The back contact battery string is provided with solder paste in the first preset area, and the first solder strip is soldered to the back contact battery in the first preset area.
15. A back-contact battery string, characterized in that, Includes multiple back contact batteries as described in any one of claims 7-11, a first solder strip, and a second solder strip; The back contact battery string has solder paste in the first preset area and solder paste in the second preset area. The first solder strip is soldered to the back contact battery in the first preset area, and the second solder strip is soldered to the back contact battery in the second preset area.
16. A back-contact battery string, characterized in that, It includes multiple back contact batteries as described in any one of claims 12 to 13.
17. A solar cell module, characterized in that, Includes the back contact battery string as described in any one of claims 14 to 16.
18. A photovoltaic power generation system, characterized in that, Includes the solar cell module as described in claim 17.