Photovoltaic module and photovoltaic string

Abstract

The utility model belongs to photovoltaic module technical field discloses photovoltaic module and photovoltaic group, and this photovoltaic module includes cell piece main part and film, and cell piece main part one side is equipped with first solder strip, positive pole thin grid and negative pole thin grid, and first solder strip includes positive pole solder strip and negative pole solder strip, and positive pole solder strip and negative pole solder strip respectively overlap positive pole thin grid and negative pole thin grid, and the both ends of cell piece main part one side are equipped with multiple PAD points, and the both ends of first solder strip are connected with PAD point respectively, and the film covers the side of cell piece main part and connects first solder strip, and the both ends of first solder strip and the PAD point of cell piece main part end part are all placed in the outer side of film, and when first solder strip and second solder strip are electrically connected, can determine the position of connecting place according to PAD point position, help to reduce the operation difficulty and shorten the operation time, and the connecting place and PAD point are electrically connected, and the current can be transmitted between solder strip and PAD point to avoid bad contact, and then can improve the conductivity.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a photovoltaic module and a photovoltaic string. Background Technology

[0002] In the traditional photovoltaic cell manufacturing process, the cell needs to be printed with main grids and sub-grids. Photovoltaic gridless technology means that the main grids are no longer printed. Instead, a thin film is used to cover the surface of the cell. In the subsequent lamination process, the solder ribbon is pressed and fixed onto the cell through the thin film. The solder ribbon collects and conducts current, which improves the power generation efficiency.

[0003] In existing technologies, multiple photovoltaic modules are connected to form a photovoltaic string. Adjacent photovoltaic modules are connected in series by solder strips. The solder strips of adjacent photovoltaic modules are directly welded together. The contact area at the solder strip connection is small, resulting in poor conductivity. The welding position is difficult to control accurately, making the welding operation difficult and time-consuming.

[0004] Therefore, there is an urgent need to provide a photovoltaic module and photovoltaic string that facilitates the determination of welding positions, helps reduce operational difficulty and shorten operation time, and improves conductivity. Utility Model Content

[0005] The purpose of this invention is to provide a photovoltaic module and a photovoltaic string that facilitates the determination of welding positions, helps reduce operational difficulty and shorten operation time, and improves conductivity.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a photovoltaic module, comprising:

[0008] The battery cell body has multiple first solder strips, multiple positive electrode grids, and multiple negative electrode grids on one side. The positive electrode grids and the negative electrode grids are arranged at intervals along a first direction. The first solder strips include positive electrode solder strips and negative electrode solder strips. The positive electrode solder strips and the negative electrode solder strips are arranged at intervals and alternates along a second direction to overlap multiple positive electrode grids and multiple negative electrode grids respectively. The first direction is perpendicular to the second direction.

[0009] Multiple PAD points are provided at both ends of one side of the main body of the battery cell, and the two ends of the first solder strip are respectively connected to the PAD points.

[0010] A film is applied to cover the side of the solar cell body connected to the first solder strip, with both ends of the first solder strip and the PAD point located at the end of the solar cell body positioned outside the film. The end of the first solder strip is used for electrical connection with the solder strip of the photovoltaic module to be connected, and the connection point is electrically connected to the PAD point.

[0011] As an optional technical solution for photovoltaic modules, the connection point is thermally fused to the PAD point.

[0012] As an optional technical solution for photovoltaic modules, the side length of the PAD point ranges from 0.3mm to 0.8mm.

[0013] As an optional technical solution for photovoltaic modules, at least one end of the first solder strip is provided with a first flat portion, which is used for electrical connection with the solder strip of the photovoltaic module to be connected.

[0014] As an optional technical solution for photovoltaic modules, a plurality of PAD points are spaced apart along the second direction, and the distance between the PAD points and the corresponding end edge of the cell body ranges from 5mm to 7mm.

[0015] As an optional technical solution for photovoltaic modules, the first welding strip is a round wire welding strip with a diameter ranging from 0.15mm to 0.8mm.

[0016] As an optional technical solution for photovoltaic modules, the thickness of the first flat portion ranges from 0.1 mm to 0.4 mm.

[0017] As an optional technical solution for photovoltaic modules, the length of the first flat portion ranges from 3mm to 10mm.

[0018] As an optional technical solution for photovoltaic modules, the coating covers 60% to 80% of the projected area of ​​the cell body.

[0019] This utility model provides a photovoltaic string, which includes a photovoltaic module to be connected and the aforementioned photovoltaic module.

[0020] As an optional technical solution for photovoltaic strings, the solder strip of the photovoltaic module to be connected is a second solder strip. The end of the second solder strip that is welded to the first solder strip is provided with a second flat portion. The second flat portion is in surface contact with the first flat portion provided at least one end of the first solder strip.

[0021] Beneficial effects:

[0022] This utility model provides a photovoltaic module, which includes a cell body and a coating. One side of the cell body has multiple first solder strips, multiple positive electrode grids, and multiple negative electrode grids. The positive and negative electrode grids are arranged at intervals along a first direction. The first solder strips include positive and negative solder strips, which are arranged alternately at intervals along a second direction to overlap the multiple positive and negative electrode grids respectively. The first direction is perpendicular to the second direction. Multiple PAD points are provided at both ends of one side of the cell body, and the two ends of the first solder strips are respectively connected to the PAD points. The coating covers the side of the cell body connected to the first solder strips. The two ends of the first solder strips and the PAD points located at the ends of the cell body are all placed outside the coating. The ends of the first solder strips are used for electrical connection with the solder strips to be connected to the photovoltaic module, and the connection point is electrically connected to the PAD point. In photovoltaic modules with positive and negative grids, the positive and negative solder ribbons are arranged alternately to connect with grids of different polarities to achieve current convergence (i.e., gridless cells). The end of the first solder ribbon is placed on the outside of the coating to connect with the solder ribbon of the photovoltaic module to be connected. When electrically connecting the first solder ribbon and the second solder ribbon, the location of the connection point can be determined by referring to the PAD point position, which helps to reduce the difficulty of operation and shorten the operation time. Moreover, the connection point is electrically connected to the PAD point, and the current can be transmitted between the solder ribbon and the PAD point to avoid poor contact, thereby improving the conductivity and ensuring that the photovoltaic module can be electrically connected to the photovoltaic module to be connected after repair.

[0023] This invention provides a photovoltaic string, which includes a photovoltaic module to be connected and the aforementioned photovoltaic module. By using photovoltaic modules, it is easier to determine the welding position, which helps to reduce the difficulty of operation, shorten the operation time, and improve the conductivity. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the photovoltaic string structure before repair;

[0025] Figure 2 This is a schematic diagram of the structure of the photovoltaic string after part of the carrier film has been removed, according to Embodiment 1 of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure for removing NG cells from a photovoltaic string according to Embodiment 1 of this utility model;

[0027] Figure 4 This is a schematic diagram of the photovoltaic module and the cut battery cells provided in Embodiment 1 of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the first and second welding strips provided in Embodiment 1 of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the repaired photovoltaic string provided in Embodiment 1 of this utility model;

[0030] Figure 7 This is a schematic diagram of the welding strip flattening tool provided in Embodiment 1 of this utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the photovoltaic string provided in Embodiment 2 of this utility model.

[0032] In the picture:

[0033] 1. Photovoltaic module; 11. PAD point; 12. First solder strip; 121. First flat section; 13. Coating; 2. Good quality cell; 3. Unacceptable cell;

[0034] 10. Carrier membrane; 20. Second welding strip; 201. Second flat section; 30. Welding strip flattening fixture; 31. Substrate; 321. Upper jaw; 322. Lower jaw. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] Example 1

[0040] Electroluminescence (EL) is a detection technique based on the electroluminescence phenomenon. When current passes through a solar cell, the electrons inside are excited to a high energy level. When these electrons fall back to a low energy level, they release energy in the form of photons, producing a light emission phenomenon.

[0041] Electroluminescence (EL) testing of photovoltaic (PV) strings can quickly and accurately detect internal defects in semi-finished PV strings. Defective cells can be identified before the lamination process for timely repair. After the lamination process, the difficulty of rework increases significantly, resulting in higher rework costs. Cells with unsatisfactory appearance and surface luminescence during EL testing are called NG cells (i.e., defective cells). NG cells are replaced after EL testing, thus completing the repair work of PV strings in a timely manner.

[0042] like Figures 1 to 7 As shown, this embodiment provides a photovoltaic module and a photovoltaic string. The photovoltaic string includes a photovoltaic module to be connected and a photovoltaic module 1. The photovoltaic module 1 specifically includes a cell body and a film 13. One side of the cell body is provided with a plurality of first solder strips 12, a plurality of positive electrode grids and a plurality of negative electrode grids. The positive electrode grids and negative electrode grids are arranged at intervals along a first direction. The first solder strips 12 include positive electrode solder strips and negative electrode solder strips. The positive electrode solder strips and negative electrode solder strips are arranged at intervals and alternates along a second direction to overlap the plurality of positive electrode grids and the plurality of negative electrode grids respectively. The first direction and the second direction are perpendicular to each other. Both ends of one side of the cell body are provided with a plurality of PAD points 11. The two ends of the first solder strips 12 are respectively connected to the PAD points 11. The film 13 covers the side of the cell body where the first solder strips 12 are provided. The two ends of the first solder strips 12 and the PAD points 11 located at the ends of the cell body are all placed outside the film 13. The ends of the first solder strips 12 are used to electrically connect with the solder strips of the photovoltaic module to be connected, and the connection point is electrically connected to the PAD point 11.

[0043] This embodiment takes a repair scenario as an example. In this embodiment, the photovoltaic module to be connected has good solar cells 2, and the solder strip of the photovoltaic module to be connected is a second solder strip 20, which is connected to the good solar cells 2. During repair, the solar cell body of the photovoltaic module 1 is used to replace the defective solar cells and is connected to the good solar cells 2.

[0044] In a photovoltaic module 1 with positive and negative grids, the positive and negative solder ribbons are arranged alternately to connect with grids of different polarities to achieve current convergence (i.e., gridless cells). The end of the first solder ribbon 12 is placed outside the coating 13 to connect with the second solder ribbon 20 of the good cell 2. During repair, the defective cell can be cut off from the photovoltaic string and replaced with the photovoltaic module 1, which simplifies the repair process and improves repair efficiency. When electrically connecting the first solder ribbon 12 and the second solder ribbon 20, the position of the connection can be determined by referring to the position of PAD point 11, which helps to reduce the difficulty of operation and shorten the operation time. Moreover, the connection point is electrically connected to PAD point 11, and the current can be transmitted between the solder ribbon and PAD point 11 to avoid poor contact, thereby improving conductivity and ensuring that the photovoltaic module 1 can be electrically connected to the photovoltaic module to be connected after repair.

[0045] Specifically, PAD point 11 refers to the metal contact point on the solar cell, primarily used to connect with the solder ribbon to facilitate current conduction. In the manufacturing process of solar cell modules, the welding of the solder ribbon to PAD point 11 is a critical step, and the quality of the weld directly affects the performance and lifespan of the solar module. Therefore, to improve the quality of finished solar modules and prevent poor welding, appropriate welding techniques and materials must be employed, and strict quality control must be implemented throughout the welding process.

[0046] In this embodiment, the first direction is the width direction of the main body of the battery cell, and the second direction is the length direction of the main body of the battery cell; the coating 13 is located at the center of the main body of the battery cell; the PAD point 11 is located near the edge of the end of the main body of the battery cell; the PAD point 11 can be made of a silver paste layer.

[0047] Optionally, the projected area of ​​the coating 13 on the main body of the solar cell ranges from 60% to 80%. In this embodiment, the area of ​​the coating 13 ranges from 16,700 square millimeters to 19,000 square millimeters.

[0048] In this embodiment, the photovoltaic module 1 is set between two good quality cells 2. It can be understood that the photovoltaic module 1 can also be applied to the end of the photovoltaic string (i.e., connected to only one good quality cell 2).

[0049] Furthermore, the connection between the first solder strip 12 and the solder strip to be connected to the photovoltaic module (i.e., the second solder strip 20) is thermally fused to PAD point 11. The first solder strip 12 and the second solder strip 20 are electrically connected by welding. Due to the lack of a main grid technology, the grid lines on the photovoltaic module 1 and the good cell 2 are relatively densely distributed. If the welding operation is improper, the solder joint is too large or the position is off, which can easily form a short circuit path. By setting PAD point 11, the welding position can be determined by referring to the position of PAD point 11, and the welding joint can be further thermally fused to PAD point 11. This can not only improve the reliability of the connection and ensure that the photovoltaic module 1 can be connected normally after repair, but also help to solve the short circuit problem during repair.

[0050] Optionally, multiple PAD points 11 are spaced apart along the second direction, and the distance between the PAD point 11 and the end edge of the corresponding solar cell body is 5mm to 7mm. By placing the PAD point 11 near the edge of the photovoltaic module 1, it is easier to connect to the good solar cell 2, reducing the current transmission distance and thus reducing current transmission loss.

[0051] Optionally, the side length of PAD point 11 ranges from 0.3mm to 0.8mm. In this embodiment, PAD point 11 is square. By setting PAD point 11 to a square shape, it can better withstand high-temperature welding and strong mechanical stress, is less prone to damage, and has better reliability and stability.

[0052] In this embodiment, the end of the first solder strip 12 of the photovoltaic module 1 is trimmed to be 5mm to 7mm inward to match the position of the PAD point 11.

[0053] In this embodiment, the first welding strip 12 is a round wire welding strip with a diameter ranging from 0.15 mm to 0.8 mm. In the design of a gridless cell, since there is no traditional grid line to collect current, the round wire welding strip, due to its unique shape and material, can meet the special requirements of the gridless cell for the series connection process. The round wire welding strip also has good conductivity and mechanical strength, which can ensure stable current transmission.

[0054] To improve the conductivity of the photovoltaic module 1, at least one end of the first solder strip 12 is provided with a first flat portion 121, which is used for electrical connection with the second solder strip 20 on the good battery cell 2. By providing the first flat portion 121, the size of the first flat portion 121 can be controlled, which also helps to better achieve the electrical connection between the first solder strip 12 and the second solder strip 20.

[0055] Furthermore, the end of the second welding strip 20 that is welded to the first welding strip 12 is provided with a second flat portion 201, and the second flat portion 201 is in surface contact with the first flat portion 121 provided at least one end of the first welding strip 12.

[0056] The second welding strip 20 is also a round wire welding strip. Compared with the traditional point contact formed by overlapping two round wire welding strips, this embodiment sets a first flat part 121 and a second flat part 201, and uses the overlap of the first flat part 121 and the second flat part 201 to form a surface contact, so that the photovoltaic module 1 and the good battery cell 2 can achieve a better contact effect and form a reliable connection after welding.

[0057] Optionally, the thickness of the first flat portion 121 ranges from 0.1 mm to 0.4 mm, and the length of the first flat portion 121 ranges from 3 mm to 10 mm. Correspondingly, the thickness of the second flat portion 201 ranges from 0.1 mm to 0.4 mm, and the length of the second flat portion 201 ranges from 3 mm to 10 mm. By limiting the width of the first flat portion 121, short circuits are prevented due to excessive width overlapping of the positive and negative electrode grids, and also by preventing the width of the first flat portion 121 from being too small, which would affect the conductivity of the photovoltaic module 1. By limiting the length of the first flat portion 121, the size of the contact surface between the first flat portion 121 and the second flat portion 201 is limited, which can evenly distribute the current and avoid excessively high local temperatures. A larger contact area can also reduce resistance and reduce energy loss.

[0058] The following is the specific process of repairing the battery string using photovoltaic module 1:

[0059] Photovoltaic module 1 adopts a cell grid design. Photovoltaic module 1 has no main grid and only retains PAD points 11 on both sides of the edge to facilitate effective welding. Photovoltaic module 1 and NG cell 3 maintain the same appearance.

[0060] Step S1: Perform EL testing on the battery string to identify NG cells 3 in the battery string. In this embodiment, using... Figure 1 For example, it was identified that there was an NG cell 3 (i.e. a defective cell) between two good cell 2.

[0061] Step S2: Peel off the carrier film 10 on the NG sheet 3 and cut the battery string to remove the NG sheet 3;

[0062] Specifically, the carrier film 10 of the NG sheet 3 is gently peeled off first. The carrier films 10 of the two good battery sheets 2 adjacent to the NG sheet 3 are partially peeled off, that is, peeled off from the side closer to the NG sheet 3 (peeled off 5mm to 18mm). Then, the battery string is cut off with a conical nail clipper and the NG sheet 3 is removed. The cut is located 3mm to 10mm inward from the edge of the NG sheet 3.

[0063] Step S3: Take out the photovoltaic module 1 and flatten the first solder strip 12 of the photovoltaic module 1 and the second solder strip 20 of the two good cells 2.

[0064] In this embodiment, a welding strip flattening fixture 30 is used for flattening. By using the welding strip flattening fixture 30 for uniform flattening, the accuracy of the flattening length and width can be ensured, guaranteeing stable contact at the subsequent welding strip overlap.

[0065] See Figure 7 The welding strip flattening fixture 30 includes a base 31 and an upper clamping jaw 321 and a lower clamping jaw 322 connected to the base 31. The welding strip flattening fixture 30 can be the head structure of a fully automatic device or a semi-automatic device. If it is an automatic device, the welding strip flattening fixture 30 needs to be connected to an electrical component, and the operation of the welding strip flattening fixture 30 is controlled by PLC programming to achieve the required flattening length and width effect. The specific operation logic is as follows: the automatic device is powered on, the welding strip to be flattened is placed between the upper clamping jaw 321 and the lower clamping jaw 322 of the welding strip flattening fixture 30, the length of the welding strip inserted is adjusted by infrared sensing (length range 3mm to 10mm), after the position is adjusted, the upper clamping jaw 321 and the lower clamping jaw 322 are brought closer to each other by air pressure control (air pressure range 0.2MPa to 0.8MPa) to flatten the welding strip.

[0066] In this embodiment, a welding strip flattening fixture 30 is used to physically flatten the first welding strip 12 and the second welding strip 20, so that the first welding strip 12 has a first flat portion 121 and the second welding strip 20 has a second flat portion 201; the first welding strip 12 and the second welding strip 20 are both round wire welding strips with a diameter range of 0.15mm to 0.8mm, and the thickness range after flattening is 0.1mm to 0.4mm. The flattening width is set to be adjustable, but a limit range is given, and the fine grid positive and negative electrodes cannot be overlapped.

[0067] Step S4: Overlap and weld the first flat portion 121 of the first welding strip 12 with the second flat portion 201 of the second welding strip 20, and heat-melt the connection between the first flat portion 121 and the second flat portion 201 with the PAD point 11.

[0068] The first flat portion 121 of the first solder strip 12 and the second flat portion 201 of the second solder strip 20 are overlapped and fused together using an electrofusion iron (welding temperature range of 280℃~320℃). The connection between the first flat portion 121 and the second flat portion 201 is heated and fused with the PAD point 11 to achieve a good metal contact effect. Finally, the partially peeled carrier film 10 on the good battery cell 2 is re-coated using a soldering iron tip, and the rework effect is identified using EL equipment.

[0069] Example 2

[0070] In Example 1, photovoltaic module 1 is used in a repair scenario; in Example 2, photovoltaic module 1 is used in a scenario where photovoltaic strings are conventionally welded together. For example... Figure 8As shown, the specific process of conventional welding using photovoltaic module 1 includes:

[0071] Step S1: After dicing the battery cells, the main body of the battery cells is obtained.

[0072] Specifically, the basic principle of solar cell dicing is to use mechanical cutting to cut a large battery into a series of thin slices. For example, a large battery is placed in a dicing machine and mechanically cut into thin slices; after cutting, a series of solar cell bodies of the same size are obtained, and then the solar cell bodies can be inspected for subsequent use.

[0073] Step S2, Pre-treatment and coating 13;

[0074] To ensure that the size of the coating 13 matches the size of the main body of the battery cell, it needs to be pre-cut to ensure that the coating 13 accurately covers the main body of the battery cell after processing.

[0075] Step S3: The battery cell body, the coating 13 and the first welding strip 12 are transferred to the heating platform, so that the battery cell body, the first welding strip 12, the coating 13 and the press are stacked and placed in sequence from bottom to top and correspond one by one. The press is used to press them together, and then the heating platform is used to weld and heat them together. The coating 13 fixes the first welding strip 12 to the battery cell body from the middle position.

[0076] In this embodiment, the battery string includes three photovoltaic modules 1, which are, from left to right, a first photovoltaic module, a second photovoltaic module, and a third photovoltaic module. The second photovoltaic module is located between the first and third photovoltaic modules. The end of the first solder strip 12 of the second photovoltaic module is recessed by 5mm to 7mm to match the position of the PAD point 11 on its cell body. One end of the first solder strip 12 on the first and third photovoltaic modules extends beyond the corresponding cell body. The ends of the first solder strip 12 of the first, second, and third photovoltaic modules can be flattened.

[0077] During heating and welding, the first welding strip 12 on the second photovoltaic module is placed on the first welding strip 12 on the first photovoltaic module. After welding and heating, the first welding strip 12 on the second photovoltaic module is connected to the first welding strip 12 on the first photovoltaic module. The connection point is heated and fused with the PAD point 11 to achieve a good metal contact effect.

[0078] In other embodiments, the ends of the first solder strips 12 of the three photovoltaic modules 1 may be recessed by 5mm to 7mm, and the first solder strips 12 of two adjacent photovoltaic modules 1 may be connected by interconnecting solder strips (that is, the ends of the interconnecting solder strips are connected to the first solder strips 12, and the connection is heated and fused with the corresponding PAD point 11).

[0079] It is understood that the relevant process parameters in this second embodiment can be the same as those in the first embodiment, such as welding temperature and flattening parameters; as for the specific dimensions of the battery cell body, welding strip 13, etc., they can be designed and adjusted according to the actual situation.

[0080] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A photovoltaic module, characterized in that, include: The battery cell body has a plurality of first solder strips (12), a plurality of positive electrode grids and a plurality of negative electrode grids on one side. The positive electrode grids and the negative electrode grids are arranged at intervals along a first direction. The first solder strips (12) include positive electrode solder strips and negative electrode solder strips. The positive electrode solder strips and the negative electrode solder strips are arranged at intervals and alternates along a second direction to overlap the plurality of positive electrode grids and the plurality of negative electrode grids respectively. The first direction is perpendicular to the second direction. Multiple PAD points (11) are provided at both ends of one side of the battery cell body, and the two ends of the first solder strip (12) are respectively connected to the PAD points (11); A film (13) is applied to cover the side of the cell body connected to the first solder strip (12), and both ends of the first solder strip (12) and the PAD point (11) located at the end of the cell body are placed outside the film (13). The end of the first solder strip (12) is used to electrically connect with the solder strip of the photovoltaic module to be connected, and the connection point is electrically connected to the PAD point (11).

2. The photovoltaic module according to claim 1, characterized in that, The connection point is heat-fused to the PAD point (11).

3. The photovoltaic module according to claim 1, characterized in that, The side length of the PAD point (11) ranges from 0.3mm to 0.8mm.

4. The photovoltaic module according to claim 1, characterized in that, At least one end of the first solder strip (12) is provided with a first flat portion (121), which is used to electrically connect with the solder strip of the photovoltaic module to be connected.

5. The photovoltaic module according to claim 1, characterized in that, The plurality of PAD points (11) are spaced apart along the second direction, and the distance between the PAD point (11) and the corresponding end edge of the battery cell body is in the range of 5mm to 7mm.

6. The photovoltaic module according to claim 4, characterized in that, The first welding strip (12) is a round wire welding strip with a diameter ranging from 0.15 mm to 0.8 mm.

7. The photovoltaic module according to claim 4, characterized in that, The thickness of the first flat portion (121) ranges from 0.1 mm to 0.4 mm.

8. The photovoltaic module according to claim 4, characterized in that, The length of the first flat portion (121) ranges from 3 mm to 10 mm.

9. The photovoltaic module according to claim 1, characterized in that, The coating (13) covers 60% to 80% of the projected area of ​​the battery cell body.

10. A photovoltaic string, characterized in that, This includes photovoltaic modules to be connected and photovoltaic modules as described in any one of claims 1-9.

11. The photovoltaic string according to claim 10, characterized in that, The welding strip of the photovoltaic module to be connected is a second welding strip (20). The second welding strip (20) is provided with a second flat part (201) at one end where it is welded to the first welding strip (12). The second flat part (201) is in surface contact with the first flat part (121) provided at at least one end of the first welding strip (12).

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