A full screen battery assembly and photovoltaic system

Abstract

The utility model is suitable for photovoltaic technical field provides a kind of full-screen battery component and photovoltaic system, this full-screen battery component includes: battery string, solder strip, busbar and isolation strip;Back contact solar cell piece is overlapped along first direction arrangement into battery string, utilize first solder strip and second solder strip series connection solar cell piece, set along the second direction extension busbar and isolation strip, realize first solder strip and the current collection of busbar and the electrical isolation of second solder strip and busbar.Through corresponding setting first recess area, second recess area and third recess area of the thickness less than other parts on at least any one of first solder strip, second solder strip and busbar three, reduce the height difference between different parts of solder strip, reduce the bending angle of first solder strip, effectively avoid the stress concentration caused by bending angle big, reduce the generation of solar cell piece hidden crack, improve the mechanical stability of battery component.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic technology, and in particular relates to a full-screen battery module and photovoltaic system. Background Technology

[0002] In the development of photovoltaic module technology, full-screen solar modules have stood out due to their unique design. To improve power generation efficiency, they employ an overlapping arrangement of solar cells, eliminating the traditional inter-cell spacing and allowing for a more compact cell arrangement, effectively increasing the light-receiving area. During manufacturing, solar cells are connected in series using solder ribbons to form cell strings, and busbars are placed in some of the stacked areas to achieve series / parallel connection of the cell strings, meeting different circuit design and performance requirements.

[0003] However, the lamination process of solder ribbons, busbars, and solar cells in the production of full-screen solar modules presents potential risks. During lamination, pressure and heat are applied to ensure a good connection, but this places significant stress on the solar cells in the busbar area, making them prone to microcracks. Microcracks reduce the module's photoelectric conversion efficiency, decreasing power generation capacity, and with long-term use, may develop into visible cracks, affecting the module's stability and lifespan. Therefore, how to reduce the risk of microcracks in the busbar area of ​​photovoltaic modules with hidden busbars has become a pressing problem that the photovoltaic manufacturing industry needs to overcome. Utility Model Content

[0004] This invention provides a full-screen battery module and photovoltaic system, aiming to solve the problem of hidden cracks in the battery cells in the busbar area of ​​a photovoltaic module with concealed busbars.

[0005] This utility model is implemented as follows: a full-screen battery assembly includes: a battery string, solder strips, busbars, and separators;

[0006] The battery string includes a plurality of back-contact solar cells arranged in an overlapping manner along a first direction, and adjacent back-contact solar cells are connected in series by the solder strip. The back-contact solar cell includes a first cell and a second cell arranged along the first direction.

[0007] The solder strips extend along the first direction and are arranged on the back side of the back-contact solar cell array, including a first solder strip and a second solder strip. The first solder strip is electrically connected to the busbar, and the second solder strip is not electrically connected to the busbar.

[0008] Both the isolation strip and the busbar extend along the second direction, and the busbar and the isolation strip are stacked together. The first direction and the second direction intersect.

[0009] The end of the first solder strip and part of the end of the second solder strip overlap in an overlapping area, which is located at the end of the second battery cell near the first battery cell. The busbar and the separator are disposed between the first solder strip and the second solder strip. The first solder strip is in contact with the busbar, and the second solder strip is in contact with the separator.

[0010] At least one of the following conditions must be met:

[0011] The first solder strip has a first recessed area, which is in contact with the busbar;

[0012] The second weld strip has a second recessed area, which is in contact with the isolation strip;

[0013] The busbar has a third recessed area, which is in contact with the first solder strip.

[0014] Optionally, the first direction and the second direction are perpendicular.

[0015] Optionally, the second solder strip includes a first connecting solder strip and a second connecting solder strip. In a first direction, the first connecting solder strip and the second connecting solder strip are alternately arranged. In a second direction, the first connecting solder strip and the second connecting solder strip are alternately arranged.

[0016] Optionally, the number of solar cells on the left side of the busbar that are in back contact with the busbar is equal to the number of solar cells on the left side of the busbar that are in back contact with the busbar.

[0017] Optionally, the width of the busbar is less than or equal to the width of the isolation bar.

[0018] Optionally, the length of the busbar is less than or equal to the length of the isolation bar.

[0019] Optionally, the first solder strip has a first side facing the back contact solar cell and a second side facing away from the back contact solar cell, and the first recessed area includes a recess disposed on the first side.

[0020] Optionally, the first recessed area may also include a recess located on the second surface.

[0021] Optionally, the second solder strip has a third side facing the back-contact solar cell and a fourth side facing away from the back-contact solar cell, and the second recessed area includes a recess located on the fourth side.

[0022] Optionally, the busbar has a fifth side facing the isolation strip and a sixth side facing away from the isolation strip, and the third recessed area includes a recess located on the sixth side.

[0023] Optionally, the third recessed area may also include a recess located on the fifth surface.

[0024] This utility model also provides a photovoltaic system, including the above-mentioned full-screen battery module.

[0025] The beneficial effects achieved by this utility model are as follows: Since the back-contact solar cells are arranged in a stacked manner along a first direction to form a cell string, and the cells are connected in series using a first and second solder strip, and a busbar and a separator extending along a second direction are provided, current collection between the first solder strip and the busbar and electrical isolation between the second solder strip and the busbar are achieved. By providing a first, second, and third recessed area with a thickness smaller than other parts on at least one of the first, second, and busbars, the height difference between different parts of the solder strip is reduced, the bending angle of the first solder strip is lowered, stress concentration caused by a large bending angle is effectively avoided, the generation of microcracks in the cells is reduced, and the mechanical stability of the battery module is improved. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the full-screen battery assembly structure;

[0027] Figure 2 It is a cross-sectional view along the AA direction in the prior art;

[0028] Figure 3 This is a cross-sectional view along the AA direction provided by this utility model;

[0029] Figure 4 This is another cross-sectional view along the AA direction provided by this utility model;

[0030] Figure 5 This is a schematic diagram of a structure of the first welding strip provided by this utility model;

[0031] Figure 6 This is a schematic diagram of a structure of the second welding strip provided by this utility model;

[0032] Figure 7 This is a schematic diagram of a busbar provided by this utility model.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100. Full-screen battery module; 110. Battery string; 111. Back contact solar cell; 1111. First solar cell; 1112. Second solar cell; 120. Welding ribbon; 121. First welding ribbon; 1211. Bending section; 122. Second welding ribbon; 1221. First connecting welding ribbon; 1222. Second connecting welding ribbon; 130. Busbar; 140. Separator strip;

[0035] 201. First side; 202. Second side; 203. Third side; 204. Fourth side; 205. Fifth side; 206. Sixth side; 207. Depression. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this utility model and are not intended to limit this utility model.

[0037] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; 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 according to the specific circumstances.

[0040] 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.

[0041] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0042] This invention employs back-contact solar cells arranged in an overlapping pattern along a first direction to form a cell string. First and second solder strips are used to connect the cells in series. Busbars and isolation strips extending along a second direction are provided to achieve current collection between the first solder strip and the busbar, and electrical isolation between the second solder strip and the busbar. At least one of the first solder strip, second solder strip, and busbar has corresponding recessed areas with thicknesses smaller than other parts, reducing the height difference between different sections of the solder strip, lowering the bending angle of the first solder strip, effectively avoiding stress concentration caused by large bending angles, reducing the generation of microcracks in the cells, and improving the mechanical stability of the battery module.

[0043] Example 1

[0044] This embodiment provides a full-screen battery assembly 100, including: a battery string 110, a solder strip 120, a busbar 130, and a separator 140;

[0045] The battery string 110 includes a plurality of back-contact solar cells 111 arranged in an overlapping manner along a first direction. Adjacent back-contact solar cells 111 are connected in series by solder strips 120. The back-contact solar cells 111 include a first cell 1111 and a second cell 1112 arranged adjacent to each other.

[0046] The solder ribbon 120 extends along a first direction and is arranged on the back side of the back contact solar cell 111 group, including a first solder ribbon 121 and a second solder ribbon 122.

[0047] Both the isolation strip 140 and the busbar 130 extend along the second direction. The busbar 130 is located on the side of the isolation strip 140 facing away from the second battery cell 1112. The first direction and the second direction intersect.

[0048] The end of the first welding strip 121 and part of the end of the second welding strip 122 overlap in the overlapping area. The overlapping area is located at one end of the second battery cell 1112 near the first battery cell 1111. A busbar 130 and a separator 140 are provided between the first welding strip 121 and the second welding strip 122. The first welding strip 121 is in contact with the busbar 130, and the second welding strip 122 is in contact with the separator 140.

[0049] At least one of the following conditions must be met:

[0050] The first weld strip 121 has a first recessed area, which is in contact with the busbar 130;

[0051] The second welding strip 122 has a second recessed area, which is in contact with the isolation strip 140;

[0052] The busbar 130 has a third recessed area, which is in contact with the first weld strip 121.

[0053] The battery string 110 includes several back-contact solar cells 111. The positive and negative electrodes of each back-contact solar cell 111 are located on its back side. Compared to the traditional structure where the positive and negative electrodes are located on the front and back sides of the back-contact solar cell 111 respectively, this reduces the shading of light by the front electrode and improves the solar cell's absorption efficiency. In the back-contact solar cells 111, the positive and negative electrodes are arranged alternately along a first direction and extend along a second direction.

[0054] The back-contact solar cells 111 are arranged in an overlapping manner along a first direction, that is, the back-contact solar cells 111 are arranged along the first direction, and adjacent back-contact solar cells 111 have a stacked area. Specifically, the back-contact solar cells 111 have a light-facing surface and a back-facing surface arranged opposite each other. Along the extension direction of the back-contact solar cells, the back-contact solar cells 111 have opposite first edges and second edges. The back-facing surface of the first back-contact solar cell 111 near the second edge is in contact with the light-facing surface of the second back-contact solar cell 111 near the first edge. The overlapping area of ​​the two back-contact solar cells 111 is the stacked area.

[0055] The back contact solar cell 111 includes a first cell 1111 and a second cell 1112. The first cell 1111 and the second cell 1112 are arranged along a first direction, that is, the second cell 1112 is arranged after the first cell 1111 is arranged. The back surface of the first cell 1111 overlaps with the light-facing surface of the second cell 1112.

[0056] The solder ribbon 120 is used to collect the charge carriers generated on each back-contact solar cell 111. The solder ribbon 120 connects two adjacent back-contact solar cells 111. The solder ribbon 120 includes a first solder ribbon 121 and a second solder ribbon 122. The first solder ribbon 121 is electrically connected to the busbar 130 and is responsible for connecting adjacent first solar cells 1111 in series with other solar cells (excluding second solar cells 1112), ensuring smooth current conduction in the solar cell string 110. Simultaneously, it is electrically connected to the busbar 130 to transmit the current generated in the solar cell string 110 to the busbar 130 for further output of electrical energy. The second solder ribbon 122 is not electrically connected to the busbar 130 and connects other solar cells besides those connected by the first solder ribbon 121. It can connect adjacent second solar cells 1112 with other solar cells (possibly first solar cells 1111).

[0057] Specifically, the length of the first welding strip 121 is greater than the length of the second welding strip 122, and the first welding strip 121 has an overlap extending in a first direction, the overlap being electrically connected to the busbar 130.

[0058] Busbar 130 and separator 140 are stacked and both extend along the second direction. Busbar 130 collects current conducted from multiple first solder strips 121, concentrating the dispersed current and ultimately delivering it to the output terminal of the battery module. Separator 140 is made of insulating material to block circuit continuity.

[0059] The second direction intersects the first direction; that is, the first direction can be the lateral direction of the back contact battery, and the second direction can be the longitudinal direction of the back contact battery, with the two being perpendicular to each other. Of course, in other embodiments, the first and second directions can also be other directions, for example, they can be the diagonal directions of the silicon substrate, and no specific limitation is made here.

[0060] The second battery cell 1112 has an overlapping region located at one end of the second battery cell 1112 near the first battery cell 1111. That is, it is the boundary region of the second battery cell 1112 in the direction of the adjacent first battery cell 1111. It can be understood that the overlapping region is close to or at least partially covers the stacked area of ​​the first battery cell 1111 and the second battery cell 1112.

[0061] Within the overlapping area, the end of the first solder strip 121 and a portion of the end of the second solder strip 122 overlap. "End" refers to the portion at the beginning or end along the extension direction of the solder strip 120, and is not necessarily a precise endpoint, but includes the endpoint and a small area near it. A busbar 130 and a separator 140 are disposed between the first solder strip 121 and the second solder strip 122. The separator 140 faces the back-contact solar cell 111 and contacts the end of the second solder strip 122, while the busbar 130 faces away from the back-contact solar cell 111 and contacts the end of the first solder strip 121.

[0062] Understandably, the first solder strip 121 is electrically connected to the busbar 130, meaning that the end of the first solder strip 121 can be in direct contact with the busbar 130, or they can be indirect contact through a conductive medium. The second solder strip 122 is not electrically connected to the busbar 130. The isolation strip 140 is disposed between the busbar 130 and the second solder strip 122, isolating the electrical path between the second solder strip 122 and the busbar 130. The second solder strip 122 and the isolation strip 140 can be in direct contact, or they can be indirect contact through other media; this is not limited here.

[0063] During assembly, the cells in the battery string 110 are connected in series. An insulating strip is placed at one end of the second cell 1112 near the first cell 1111. A busbar 130 is placed on the side of the insulating strip that is in back contact with the solar cell 111. A solder ribbon 120 is electrically connected to the effective welding position of the first cell 1111. The end of the solder ribbon 120 near the second cell 1112 is electrically connected to the busbar 130, thereby enabling the busbar 130 to draw out the current of the battery string 110.

[0064] The light-facing surface of the second solar cell 1112 overlaps the back-facing surface of the first solar cell 1111, meaning the back-facing surface of the second solar cell 1112 is higher than that of the first solar cell 1111. Simultaneously, in the overlapping area, the back-facing surface of the second solar cell 1112 is sequentially provided with a second solder ribbon 122, a spacer strip 140, a busbar 130, and a first solder ribbon 121. Part of the first solder ribbon 121 is placed on the back-facing surface of the first solar cell 1111, and part is placed in the overlapping area, with a height difference H between the two parts, connected by a bend. It is understandable that the greater the height difference H between the two parts, the larger the bending angle of the bend. When the bending angle of the first solder ribbon 121 is large, during the battery assembly encapsulation process, the encapsulation material (such as EVA film) will generate shrinkage stress during the heating and curing process. This shrinkage stress will act on the solder ribbon 120 and the solar cells it is connected to. The 120° bend in the solder strip, with its large bending angle, will concentrate this stress and transfer it to the edge or a specific area inside the connected solar cell. Solar cells are brittle materials; under large concentrated stress, their internal crystal structure is easily disrupted, resulting in microcracks, or hidden cracks.

[0065] At least one of the following conditions must be met: a first recessed area is present on the first solder strip 121, and the first recessed area is in contact with the busbar 130; a second recessed area is present on the second solder strip 122, and the second recessed area is in contact with the separator 140; a third recessed area is present on the busbar 130, and the third recessed area is in contact with the first solder strip 121. Specifically, only one solder strip 121 may have a first recessed area; only the second solder strip 122 may have a second recessed area; only the busbar 130 may have a third recessed area; the first solder strip 121 may have a first recessed area, and the second solder strip 122 may have a second recessed area; the first solder strip 121 may have a first recessed area, the second solder strip 122 may have a second recessed area, and the busbar 130 may have a third recessed area. Other combinations are also possible, not all of which are listed. The position of the third recessed area corresponds to the position of the first recessed area and the position of the second recessed area, respectively.

[0066] Understandably, a recessed area refers to a region whose surface is concave relative to the surrounding surface. Specifically, the thickness of the recessed area can be less than the thickness of other surrounding areas; for example, the thickness of the first recessed area is less than the thickness of other locations on the first solder strip 121. Due to the presence of at least one of the first, second, and third recessed areas, the height difference H between the two parts of the first solder strip 121 is reduced, lowering the bending angle of the bent portion and thus reducing the risk of microcracks in the full-screen battery assembly 100.

[0067] In this embodiment, back-contact solar cells 111 are arranged in overlapping rows along a first direction to form a cell string 110. First solder strips 121 and second solder strips 122 are used to connect the cells in series. A busbar 130 and a separator 140 extending along a second direction are provided to achieve current collection between the first solder strip 121 and the busbar 130, and electrical isolation between the second solder strip 122 and the busbar 130. By providing a first recessed area, a second recessed area, and a third recessed area with a thickness smaller than other parts on at least one of the first solder strip 121, the second solder strip 122, and the busbar 130, the height difference between different parts of the solder strip 120 is reduced, the bending angle of the first solder strip 121 is lowered, stress concentration caused by a large bending angle is effectively avoided, the generation of microcracks in the cells is reduced, and the mechanical stability of the battery module is improved.

[0068] The battery module may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film (not shown in the figures). The encapsulating film can be filled between the light-facing side of the back-contact solar cell and the photovoltaic glass, the back-facing side and the backsheet, and adjacent cells. As a filler, it can be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film can be EVA film or POE film, and the specific choice can be made according to the actual situation. There are no restrictions here.

[0069] Photovoltaic glass can be applied to the photoresist film on the light-facing side of the back-contact solar cell. This photovoltaic glass can be ultra-clear glass, possessing high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the back-contact solar cell while minimizing impact on its efficiency. Simultaneously, the photoresist film bonds the photovoltaic glass and the back-contact solar cell together, providing sealing, insulation, and waterproofing / moisture protection for the back-contact solar cell.

[0070] The backsheet can be attached to the adhesive film on the back side of the back-contact solar cell. The backsheet protects and supports the back-contact solar cell, providing reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, aluminum alloy TPT composite film, etc., with specific choices depending on the specific circumstances. The backsheet, back-contact solar cell, adhesive film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire solar module, providing stable support and installation. For example, the solar module can be installed at the desired location using the metal frame.

[0071] Example 2

[0072] In some embodiments, the second solder strip 122 includes a first connecting solder strip 1221 and a second connecting solder strip 1222. In a first direction, the first connecting solder strip 1221 and the second connecting solder strip 1222 are alternately arranged. In a second direction, the first connecting solder strip 1221 and the second connecting solder strip 1222 are alternately arranged.

[0073] In a battery string 110, the Nth, N+1th, and N+2th battery cells (N is a positive integer greater than 1) are arranged sequentially along a first direction. The positive terminal of the Nth battery cell is connected to the negative terminal of the N+1th battery cell via multiple first connecting solder strips 1221, and the positive terminal of the N+1th battery cell is connected to the negative terminal of the N+2th battery cell via multiple second connecting solder strips 1222. The N+1th battery cell is not a first battery cell 1111. When the N+1th battery cell is a first battery cell 1111, the positive terminal of the Nth battery cell is connected to the negative terminal of the N+1th battery cell via the first solder strips 121.

[0074] In this embodiment, the first connecting solder strip 1221 and the second connecting solder strip 1222 are staggered, allowing them to connect the positive and negative solder joints of adjacent solar cells more directly, effectively shortening the current transmission path between solar cells. This helps reduce resistance, minimizes energy loss during transmission, ensures smooth current flow, and improves the power generation efficiency of the solar module.

[0075] Example 3

[0076] In some embodiments, the number of solar cells 111 that are in back contact with the left side of the busbar 130 is equal to the number of solar cells 111 that are in back contact with the left side of the busbar 130.

[0077] In other words, in the first direction, the busbar 130 is positioned in the middle of the solar cell. On one hand, the current generated by the solar cell needs to be collected and output through the busbar 130. When the busbar 130 is in the middle position, the average distance the current travels from each solar cell to the busbar 130 is shorter. According to the law of resistance, a shorter current transmission path means lower resistance, thereby reducing energy loss during transmission and improving the overall power generation efficiency of the back-contact solar cell module, enabling it to convert more solar energy into electrical energy output.

[0078] On the other hand, the busbar 130 located in the middle allows the current generated on both sides of the battery cell to be collected more evenly onto the busbar 130, avoiding uneven current distribution caused by the busbar 130 being biased to one side. This uniform current distribution helps reduce localized overheating, lowers the risk of battery cell damage due to overheating, and extends the lifespan of the battery module.

[0079] Example 4

[0080] In some embodiments, the width of the busbar 130 is less than or equal to the width of the isolation strip 140.

[0081] When the width of the busbar 130 is less than or equal to the width of the insulating strip 140, the insulating strip 140 can completely cover the lateral area of ​​the busbar 130. This means that a continuous and complete insulating barrier is formed between the busbar 130 and the second solder strip 122, effectively preventing abnormal current conduction from the busbar 130 side to the second solder strip 122, and greatly reducing the risk of leakage and short circuit caused by direct contact between the two or electric field interference.

[0082] In some embodiments, the length of the busbar 130 is less than or equal to the length of the isolation bar 140.

[0083] The length of the busbar 130 is less than or equal to the length of the separator 140, ensuring that the separator 140 provides insulation protection throughout the entire longitudinal direction of the busbar 130. In this way, regardless of how the current flows along the busbar 130, it will not breach the insulation of the separator 140 and make leakage contact with the second solder strip 122, thus avoiding short circuits caused by longitudinal leakage and ensuring the safety of the internal electrical path of the battery module.

[0084] Example 5

[0085] In some embodiments, the first solder strip 121 has a first surface 201 facing the back contact solar cell 111 and a second surface 202 facing away from the back contact solar cell 111, and the first recessed area includes a recess 207 disposed on the first surface 201.

[0086] The first surface 201 of the first solder strip 121 contacts the first battery cell 1111 and the busbar 130 respectively. The height difference H between the backlight portion of the first solder strip 121 and the portion placed in the overlapping area is the vertical distance between the second surfaces 202 of the two portions. The recess 207 of the first surface 201, which contacts the busbar 130, helps to shorten the height difference H.

[0087] Furthermore, the first recessed area also includes a recess 207 located on the second surface 202.

[0088] The recess 207 on the second surface 202 works in conjunction with the recess 207 on the first surface 201 to form a "reinforcing rib" structure in the thickness direction of the first welding strip 121, thereby enhancing the bending and torsional resistance of the welding strip 120.

[0089] Example 6

[0090] In some embodiments, the second solder strip 122 has a third surface 203 facing the back contact solar cell 111 and a fourth surface 204 facing away from the back contact solar cell 111, and the second recessed region includes a recess 207 disposed on the fourth surface 204.

[0091] The third surface 203 of the second welding strip 122 contacts the corresponding back contact battery, and the recess 207 is located on the fourth surface 204, which helps to shorten the height difference H while ensuring the contact area between the third surface 203 and the back contact battery.

[0092] Example 7

[0093] In some embodiments, the busbar 130 has a fifth surface 205 facing the isolation bar 140 and a sixth surface 206 facing away from the isolation bar 140, and includes a recess 207 located on the sixth surface 206 in the third recessed area.

[0094] The sixth surface 206 faces away from the isolation strip 140, that is, the sixth surface 206 is in contact with the first solder strip 121. The recess 207 is located on the sixth surface 206, and the first solder strip 121 is placed in the recess 207. The busbar 130 provides a limit for the first solder strip 121, and at the same time, further shortens the height difference H.

[0095] Furthermore, the third recessed area also includes a recess 207 located on the fifth surface 205.

[0096] Typically, the separator strip 140 is a soft, film-like material that can deform along the outer contour of the structure in contact with it, and is attached to that structure. The fifth surface 205 of the busbar 130 faces the second solder strip 122 and contacts the second solder strip 122 through the separator strip 140. Since the separator strip 140 is a soft, film-like material, the second solder strip 122 is embedded in the recess 207 of the fifth surface 205. The busbar 130 provides a limit for the second solder strip 122 and further shortens the height difference H.

[0097] Example 8

[0098] A photovoltaic system comprising the aforementioned full-screen battery module 100.

[0099] Photovoltaic systems can be applied in photovoltaic power plants, such as ground-mounted, rooftop, and floating power plants, as well as in equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it's understandable that the application scenarios of photovoltaic systems are not limited to these; that is, photovoltaic systems can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation network as an example, a photovoltaic system can include photovoltaic arrays, combiner boxes, and inverters. A photovoltaic array can be a combination of multiple battery modules; for example, multiple battery modules can form multiple photovoltaic arrays. The photovoltaic arrays are connected to combiner boxes, which collect the current generated by the photovoltaic arrays. The collected current flows through an inverter and is converted into AC power required by the mains grid before being connected to the mains grid to achieve solar power supply.

[0100] The beneficial effects of the photovoltaic system in this embodiment are equivalent to the beneficial effects of the full-screen battery module 100 described above, and will not be repeated here.

[0101] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A full-screen battery assembly, characterized in that, include: Battery strings, solder strips, busbars, and separators; The battery string includes a plurality of back-contact solar cells arranged in an overlapping manner along a first direction, and adjacent back-contact solar cells are connected in series by the solder strip. The back-contact solar cell includes a first cell and a second cell arranged along the first direction. The solder strips extend along the first direction and are arranged on the back side of the back-contacting solar cell array, including a first solder strip and a second solder strip; Both the isolation strip and the busbar extend along the second direction, and the busbar and the isolation strip are stacked together. The first direction and the second direction intersect. The end of the first solder strip and part of the end of the second solder strip overlap in an overlapping area, which is located at the end of the second battery cell near the first battery cell. The busbar and the separator are disposed between the first solder strip and the second solder strip. The first solder strip is in contact with the busbar, and the second solder strip is in contact with the separator. At least one of the following conditions must be met: The first solder strip has a first recessed area, which is in contact with the busbar; The second weld strip has a second recessed area, which is in contact with the isolation strip; The busbar has a third recessed area, which is in contact with the first solder strip.

2. The full-screen battery assembly as described in claim 1, characterized in that, The first direction and the second direction are perpendicular.

3. The full-screen battery assembly as described in claim 1, characterized in that, The second welding strip includes a first connecting welding strip and a second connecting welding strip. In a first direction, the first connecting welding strip and the second connecting welding strip are alternately arranged. In a second direction, the first connecting welding strip and the second connecting welding strip are alternately arranged.

4. The full-screen battery assembly as described in claim 1, characterized in that, The number of solar cells that are in back contact with the left side of the busbar is equal to the number of solar cells that are in back contact with the left side of the busbar.

5. The full-screen battery assembly as described in claim 1, characterized in that, The width of the busbar is less than or equal to the width of the isolation bar.

6. The full-screen battery assembly as described in claim 1, characterized in that, The length of the busbar is less than or equal to the length of the isolation bar.

7. The full-screen battery assembly as described in claim 1, characterized in that, The first solder strip has a first side facing the back contact solar cell and a second side facing away from the back contact solar cell, and the first recessed area includes a recess located on the first side.

8. The full-screen battery assembly as described in claim 7, characterized in that, The first recessed area also includes a recess located on the second surface.

9. The full-screen battery assembly as described in claim 1, characterized in that, The second solder strip has a third side facing the back contact solar cell and a fourth side facing away from the back contact solar cell, and the second recessed area includes a recess located on the fourth side.

10. The full-screen battery assembly as described in claim 1, characterized in that, The busbar has a fifth side facing the isolation strip and a sixth side facing away from the isolation strip, and the third recessed area includes a recess located on the sixth side.

11. The full-screen battery assembly as described in claim 10, characterized in that, The third recessed area also includes a recess located on the fifth surface.

12. A photovoltaic system comprising a full-screen battery module as described in any one of claims 1-11.

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