Back contact battery assembly and photovoltaic system

Abstract

The utility model is suitable for the technical field of solar cells, and provides a back contact cell assembly and a photovoltaic system.The back contact cell assembly comprises a cell string, an insulating strip and a bus bar, the cell string comprises a plurality of cell pieces connected in series, the cell pieces are distributed in the first direction, the insulating strip is arranged on the backlight face of the cell pieces in the second direction, the first direction and the second direction intersect, the bus bars are arranged on the sides, away from the battery pieces, of the insulating strips in the second direction, and the insulating strips cover the bus bars. Therefore, the bus bar is hidden in the backlight surfaces of the plurality of battery pieces, and the bus bar cannot be observed from one side of the light receiving surface, so that the overall color of the front surface of the back contact battery assembly is uniform and beautiful. And meanwhile, the insulating strip can be arranged between the bus bar and the battery piece, so that the short circuit problem is avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of solar cells, and in particular to a back-contact cell assembly and a photovoltaic system. Background Art

[0002] Solar cell power generation is a sustainable source of clean energy. It uses the photovoltaic effect of semiconductor pn junction to convert sunlight into electrical energy. In the related art, multiple back-contact cells are subjected to steps such as series welding, lamination, and packaging to form a back-contact cell assembly. Among them, the back-contact cell assembly includes a bus bar for series connection. The exposed bus bar affects the appearance of the cell. At the same time, the bus bar will reduce the light-receiving area of ​​the cell, resulting in poor power generation efficiency. Utility Model Content

[0003] The present application provides a back-contact battery assembly and a photovoltaic system, aiming to solve the problem of how to avoid exposure of bus bars and reduce power generation efficiency.

[0004] The back-contact battery assembly provided in the present application includes a battery string, an insulating strip and a bus bar, the battery string includes a plurality of battery cells connected in series, the plurality of battery cells are distributed along a first direction, the insulating strip is arranged on the backlight surface of the battery cell along a second direction, wherein the first direction and the second direction are arranged to intersect, the bus bar is arranged on the side of the insulating strip away from the battery cell along the second direction, and the insulating strip covers the bus bar.

[0005] Furthermore, in the second direction, the insulating strip covers the bus bar; in the first direction, the insulating strip covers and exceeds the bus bar.

[0006] Furthermore, the back contact battery assembly also includes a welding ribbon, and the welding ribbon includes a first welding ribbon and a second welding ribbon, the first welding ribbon is used to connect the adjacent battery cells, and the second welding ribbon is used to connect the battery cells and the bus bar.

[0007] Furthermore, the second welding strip is arranged on a side of the bus bar away from the insulating strip or the second welding strip is arranged on a side of the bus bar close to the insulating strip.

[0008] Furthermore, the battery string includes a first battery cell and a second battery cell that are adjacent to each other, the insulating strip is arranged on the backlight surface of the first battery cell, the second welding strip connects the second battery cell and the bus bar respectively, and the insulating strip blocks the second welding strip and the first battery cell.

[0009] Furthermore, the first battery cell and the second battery cell are at least partially stacked together.

[0010] Furthermore, when the backlight surface of the first cell and the light-receiving surface of the second cell are at least partially stacked together, the insulating strip is at least partially connected to the backlight surface of the second cell.

[0011] Furthermore, the battery cell is rectangular, and the battery cell further includes a chamfered edge and a cut edge, the chamfered edge and the cut edge are distributed on both sides of the battery cell along the first direction, and the first direction and the second direction are vertically arranged.

[0012] Furthermore, in the first direction, the chamfered edge of the battery cell is butted against the chamfered edge of an adjacent battery cell, and the cut edge of the battery cell is butted against the cut edge of an adjacent battery cell; or

[0013] In the first direction, the chamfered edge of the battery cell is butted against the cut edge of the adjacent battery cell and the cut edge of the battery cell is butted against the chamfered edge of the adjacent battery cell.

[0014] The photovoltaic system provided in the embodiments of the present application includes the back-contact cell assembly described in any one of the embodiments above.

[0015] In the back-contact battery assembly and photovoltaic system of the embodiment of the present application, the back-contact battery assembly includes a battery string, an insulating strip and a bus bar, the battery string includes a plurality of battery cells connected in series, the plurality of battery cells are distributed along a first direction, the insulating strip is arranged on the backlight surface of the battery cell along a second direction, wherein the first direction and the second direction are arranged to intersect, the bus bar is arranged on the side of the insulating strip away from the battery cell along the second direction, and the insulating strip covers the bus bar. In this way, the bus bar is hidden in the backlight surface of the plurality of battery cells, and the bus bar cannot be observed from the light-receiving side, so that the overall color of the front of the back-contact battery assembly is uniform and beautiful. At the same time, the insulating strip can be arranged between the bus bar and the battery cell to avoid short circuit problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a back contact battery assembly according to an embodiment of the present application;

[0017] Figure 2 is a schematic cross-sectional structure diagram of a back contact battery assembly according to an embodiment of the present application;

[0018] Figure 3 is another cross-sectional structural schematic diagram of a back contact battery assembly according to an embodiment of the present application;

[0019] Figure 4 is another structural schematic diagram of a back contact battery assembly according to an embodiment of the present application;

[0020] Figure 5 is another structural schematic diagram of a back contact battery assembly according to an embodiment of the present application;

[0021] Figure 6 It is a structural schematic diagram of a photovoltaic system according to an embodiment of the present application.

[0022] Description of main component symbols:

[0023] Back contact battery assembly 100, battery string 10, battery cell 11, first battery cell 111, second battery cell 112, backlight surface 113, light receiving surface 114, chamfered edge 115, cutting edge 116, insulating strip 20, bus bar 30, welding strip 40, first welding strip 41, second welding strip 42, photovoltaic system 200. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0025] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can be aware of the application of other processes and / or the use scenarios of other materials.

[0030] In the related art, the exposed busbar affects the appearance of the battery cell, and the busbar reduces the light-receiving area of ​​the battery cell, resulting in poor power generation efficiency. In the present application, the busbar is hidden in the backlight side of multiple battery cells, and the busbar cannot be observed from the light-receiving side, so that the overall color of the front of the back contact battery assembly is uniform and beautiful. At the same time, the insulating strip can be set between the busbar and the battery cell to avoid short circuit problems.

[0031] Embodiment 1

[0032] See also Figure 1 , Figure 2 and Figure 3The back-contact battery assembly 100 provided in the present application includes a battery string 10, an insulating strip 20 and a bus bar 30. The battery string 10 includes a plurality of battery cells 11 connected in series. The plurality of battery cells 11 are distributed along a first direction. The insulating strip 20 is arranged on a backlight surface 113 of the battery cell 11 along a second direction. The first direction and the second direction are arranged to intersect. The bus bar 30 is arranged on a side of the insulating strip 20 away from the battery cell 11 along the second direction. The insulating strip 20 covers the bus bar 30.

[0033] In this embodiment, the insulating strip 20 and the bus bar 30 are both arranged along the second direction, wherein the insulating strip 20 covers the bus bar 30 means that when observed from the backlight surface 113 of the battery cell 11, the projection of the bus bar 30 is completely located inside the insulating strip 20, or when observed from the light-receiving surface 114 of the battery cell 11, the insulating strip 20 can completely block the bus bar 30 to prevent the bus bar 30 from being exposed. At the same time, the bus bar 30 and the insulating strip 20 can be arranged on the backlight surface 113 of the battery cell 11 to avoid affecting the light-receiving surface 114 of the battery cell 11, so that the light-receiving surface 114 of the battery cell 11 is larger and the power generation efficiency is higher. In this way, the insulating strip 20 of this embodiment is a long strip similar in shape to the bus bar 30. Compared with the insulating component that needs to be prepared by grooving, segment distribution, punching, etc., the insulating strip 20 of this embodiment has a simpler process and can save production time.

[0034] Specifically, the long insulating strip 20 also has the characteristics of easier placement, lower requirements for equipment refinement, higher production yield, etc. In this way, the overall equipment and production cost of the entire back contact battery assembly 100 can be minimized, and the assembly reliability is better.

[0035] Further, in the embodiment of the present application, the bus bar 30 may be a middle bus bar 30, located in the middle of the battery string 10. The bus bar 30 may also be an end bus bar 30, located at the end of the battery string 10. The specific position and specific form of the bus bar 30 are not limited here to meet various needs.

[0036] In this embodiment, multiple back-contact cells in the back-contact battery assembly 100 can be connected in series in sequence to form a battery string 10, thereby realizing the series bus output of the current. For example, the series connection of the battery cells 11 can be realized by setting a welding strip 40 (bus bar 30, interconnection bar), a conductive back plate, etc.

[0037] It is understandable that in such an embodiment, the back contact battery assembly 100 may also include a frame, a back plate, a photovoltaic glass and an adhesive film. The adhesive film may be filled between the front and back of the back contact battery and the photovoltaic glass, adjacent battery cells 11, etc. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the adhesive film may be an EVA adhesive film or a POE adhesive film, which may be selected according to actual conditions and is not limited here.

[0038] Photovoltaic glass can cover the adhesive film on the front of the back contact cell. The photovoltaic glass can be ultra-white glass, which has high light transmittance, high transparency, and excellent physical, mechanical and optical properties. For example, the light transmittance of ultra-white glass can reach more than 92%, which can protect the back contact cell without affecting the efficiency of the back contact cell as much as possible. At the same time, the adhesive film can bond the photovoltaic glass and the back contact cell together. The presence of the adhesive film can seal and insulate the back contact cell and prevent water and moisture.

[0039] The backplane can be attached to the adhesive film on the back of the back contact battery. The backplane can protect and support the back contact battery and has reliable insulation, water resistance and aging resistance. There are multiple options for the backplane, which can usually be tempered glass, organic glass, aluminum alloy TPT composite adhesive film, etc. It can be set according to specific circumstances and is not limited here. The whole composed of the backplane, back contact battery, adhesive film and photovoltaic glass can be set on the frame. The frame serves as the main external support structure of the entire back contact battery assembly 100 and can provide stable support and installation for the back contact battery assembly 100. For example, the back contact battery assembly 100 can be installed at the required installation position through the frame.

[0040] In one example, when the busbar 30 is an end busbar 30, the welding strip 40 to be welded to the busbar 30 extends to the second-to-last row of battery cells 11, and the insulating strip 20 and the busbar 30 are both placed at a position where the second-to-last row of battery cells 11 is close to the last row of battery cells 11. The width of the insulating strip 20 is greater than the width of the busbar 30. The edge of the insulating strip 20 exceeds the gap between the stacked sheets and cannot cover the effective welding position of the last row of battery cells 11.

[0041] In another example, when the bus bar 30 is an intermediate bus bar 30, the welding strip 40 to be welded to the bus bar 30 extends to the second-to-last row of cells 11 of the power generation unit, and the insulating strip 20 and the bus bar 30 are both placed at the position of the second-to-last row of cells 11 close to the last row of cells 11. The width of the insulating strip 20 is greater than the width of the bus bar 30. The edge of the insulating strip 20 exceeds the gap between the stacked sheets and cannot cover the effective welding position of the last row of cells 11.

[0042] It is understandable that in the battery string 10, the battery string 10 may include two battery cells 11 connected in series, three battery cells 11 connected in series, or any other greater number of battery cells 11. The specific number of battery cells 11 to be connected in series can be determined based on actual usage.

[0043] In the embodiment of the present application, there is no limitation on the size and type of the bus bar 30 and the insulating bar 20 . It is only necessary for the insulating bar 20 to cover the bus bar 30 to meet different requirements.

[0044] Embodiment 2

[0045] See also Figure 1 In some optional embodiments, the insulating strip 20 covers the bus bar 30 in the second direction; and the insulating strip 20 covers and exceeds the bus bar 30 in the first direction.

[0046] In this way, the first direction and the second direction can determine the plane of the backlight surface 113 of the battery cell 11, so that when the insulating strip 20 and the bus bar 30 are attached to the backlight surface 113 of the battery cell 11, the insulating strip 20 can completely isolate the bus bar 30 and the battery cell 11 to which the insulating strip 20 is attached, avoiding a short circuit between the two.

[0047] Embodiment 3

[0048] See also Figure 1 , Figure 2 and Figure 3 In some optional embodiments, the back contact battery assembly 100 further includes a welding ribbon 40 , the welding ribbon 40 includes a first welding ribbon 41 and a second welding ribbon 42 , the first welding ribbon 41 is used to connect adjacent battery cells 11 , and the second welding ribbon 42 is used to connect the battery cells 11 and the bus bar 30 .

[0049] In the embodiment of the present application, the welding strip 40 can be used to connect two adjacent battery cells 11, and can also be used to connect adjacent battery cells 11 and bus bars 30. That is, the welding strip 40 used to connect two adjacent battery cells 11 is the first welding strip 41, and the welding strip 40 used to connect the battery cell 11 and the bus bar 30 is the second welding strip 42. The first welding strip 41 is used to make the adjacent battery cells 11 electrically conductive, and the first welding strip 41 is used to make the adjacent battery cells 11 and the bus bar 30 electrically conductive.

[0050] Specifically, the soldering ribbon 40 may include a copper core and a tin layer covering the copper core. The tin layer may cover the entire surface or a portion of the surface of the copper core. For example, the tin layer may cover the entire surface of the copper core facing the battery cell 11 and the entire surface facing away from the battery cell 11, but not the side of the copper core. For another example, the tin layer covers the entire surface of the copper core.

[0051] Further, in the embodiments of the present application, the specific type of the tin layer is not limited to meet various requirements. For example, the tin layer can be a single tin layer or a tin alloy layer. The tin alloy layer includes but is not limited to at least one of a SnPb layer, a SnBi layer, and a SnAg layer.

[0052] In addition, in the embodiment of the present application, the size and type of the welding strip 40 are not limited to meet different needs.

[0053] Embodiment 4

[0054] See also Figure 2 and Figure 3 In some optional embodiments, the second welding ribbon 42 is disposed on a side of the bus bar 30 away from the insulating strip 20 or the second welding ribbon 42 is disposed on a side of the bus bar 30 close to the insulating strip 20 .

[0055] Specifically, in one embodiment, the second welding strip 42 is disposed on a side of the bus bar 30 away from the insulating strip 20, so that it is easier to weld the second welding strip 42, and the end of the second welding strip 42 can be directly welded to the exposed surface of the bus bar 30. In another embodiment, the second welding strip 42 is disposed on a side of the bus bar 30 close to the insulating strip 20, and at this time, the end of the second welding strip 42 can be clamped between the bus bar 30 and the insulating strip 20, so that the bus bar 30 can be connected to the second welding strip 42 more stably.

[0056] Preferably, the second welding strip 42 is arranged on the side of the bus bar 30 close to the insulating strip 20, that is, the end of the second welding strip 42 is arranged between the bus bar 30 and the insulating strip 20, so that the height difference between the second welding strip 42 and the battery cell 11 can be smaller, and the welding effect with the battery cell 11 is better.

[0057] Embodiment 5

[0058] See also Figure 1 , Figure 2 and Figure 3 In some optional embodiments, the battery string 10 includes an adjacent first battery cell 111 and a second battery cell 112, the insulating strip 20 is arranged on the backlight surface 113 of the first battery cell 111, the second welding strip 42 connects the second battery cell 112 and the bus bar 30 respectively, and the insulating strip 20 blocks the second welding strip 42 and the first battery cell 111.

[0059] Specifically, the specifications of the first battery cell 111 and the second battery cell 112 may be the same or different; the structures of the first battery cell 111 and the second battery cell 112 may be the same or different. The specific relationship between the first battery cell 111 and the second battery cell 112 is not limited here.

[0060] It is understandable that the “first” and “second” in the first battery cell 111 and the second battery cell 112 are relative concepts, referring to two different back contact batteries. Figure 1 In the example, the back contact battery on the left is marked as the first battery cell 111, and the back contact battery on the right is marked as the second battery cell 112.

[0061] Embodiment 6

[0062] See also Figure 1 , Figure 2 and Figure 3 In some optional embodiments, the first battery cell 111 and the second battery cell 112 are at least partially stacked together.

[0063] In this way, the back contact battery assembly 100 can have a larger light-receiving surface 114 , thereby preventing components such as the soldering ribbon 40 and the bus bar 30 from being exposed in the gap between the first battery cell 111 and the second battery cell 112 .

[0064] In the embodiment of the present application, the specific positions of the first battery cell 111 and the second battery cell 112 are not limited to meet different needs. In one embodiment, the edges of the first battery cell 111 and the second battery cell 112 are at least partially stacked together; in another embodiment, the second battery cell 112 and the first battery cell 111 can be spaced apart. The spacing between the second battery cell 112 and the first battery cell 111 is within a suitable range, which can avoid the small operating space and high welding difficulty caused by too small spacing, and can also avoid the waste of component space and increased costs caused by too large spacing.

[0065] Embodiment 7

[0066] See also Figure 1 and Figure 2 In some optional embodiments, when the backlight surface 113 of the first battery cell 111 and the light-receiving surface 114 of the second battery cell 112 are at least partially stacked together, the insulating strip 20 is at least partially connected to the backlight surface 113 of the second battery cell 112 .

[0067] In this embodiment, the backlight surface 113 of the first cell 111 and the light-receiving surface 114 of the second cell 112 are overlapped together, so that there is no gap between the first cell 111 and the second cell 112, and the insulating strip 20 is arranged on the backlight surface 113 of the first cell 111, and the edge portion of the insulating strip 20 close to the second cell 112 is attached to the backlight surface 113 of the second cell 112. At this time, the welding strip 40 located on the backlight surface 113 of the second cell 112 can be blocked by the insulating strip 20, so that the welding strip 40 can be stably connected to the bus bar 30, avoiding short circuit between the first cell 111 and the welding strip 40 or the bus bar 30.

[0068] Of course, in other embodiments, the light-receiving surface 114 of the first battery cell 111 and the backlight surface 113 of the second battery cell 112 may also be at least partially stacked together, which is not specifically limited here.

[0069] Embodiment 8

[0070] See also Figure 1 , Figure 4 and Figure 5 In some optional embodiments, the battery cell 11 is rectangular, and the battery cell 11 also includes a chamfered edge 115 and a cut edge 116. The chamfered edge 115 and the cut edge 116 are distributed on both sides of the battery cell 11 along a first direction, and the first direction and the second direction are vertically arranged.

[0071] Specifically, the insulating strip 20 and the bus bar 30 may both be rectangular, and in this case, the first direction and the second direction may be vertical directions, so that the small rectangle of the bus bar 30 is located inside the large rectangle of the insulating strip 20. The battery cell 11 may include parallel chamfered edges 115 and cut edges 116, and the extending directions of the chamfered edges 115 and the cut edges 116 are both in the second direction, and the chamfered edge 115 is an edge with chamfers at both ends.

[0072] Further, in the embodiment of the present application, the positions of the chamfered edge 115 and the cut edge 116 are not limited to meet different needs. In one embodiment, the battery cells 11 can be distributed up and down, that is, the first direction is the vertical up and down direction, in which case the battery cells 11 can be distributed in a form with the chamfered edge 115 on the top and the cut edge 116 on the bottom; or the battery cells 11 can be distributed in a form with the cut edge 116 on the top and the chamfered edge 115 on the bottom.

[0073] In this embodiment, the preparation process of the battery cell 11 is not limited to meet different needs. For example, the battery cell 11 can be formed by cutting a large rectangular battery cell 11, and chamfers can be formed on the four corners before cutting, and then cut along the middle position to form two formed battery cells 11, and the battery cell 11 has parallel chamfered edges 115 and cut edges 116.

[0074] Embodiment 9

[0075] See also Figure 4 and Figure 5 In some optional embodiments, in the first direction, the chamfered edge 115 of the battery cell 11 is butted against the chamfered edge 115 of the adjacent battery cell 11, and the cut edge 116 of the battery cell 11 is butted against the cut edge 116 of the adjacent battery cell 11; or

[0076] In the first direction, the chamfered edge 115 of the battery cell 11 is butted against the cut edge 116 of the adjacent battery cell 11 , and the cut edge 116 of the battery cell 11 is butted against the chamfered edge 115 of the adjacent battery cell 11 .

[0077] In one embodiment, adjacent cells 11 are symmetrically arranged. From left to right, the first cell 11 has the chamfered edge 115 placed on the left and the cut edge 116 placed on the right; the first cell 11 has the cut edge 116 placed on the left and the chamfered edge 115 placed on the right; the third cell 11 has the chamfered edge 115 placed on the left and the cut edge 116 placed on the right, and so on. In this way, the cell 11 is easier to locate, and the positions of the solder strip 40, the bus bar 30 and the insulating strip 20 can be determined according to the placement direction of the cell 11.

[0078] In another embodiment, the placement of the battery cells 11 is the same, and in the direction from left to right, the chamfered edge 115 is placed on the left side, and the cut edge 116 is placed on the right side. Multiple battery cells 11 are overlapped together in sequence, and at this time, the cut edge 116 of the left battery cell 11 is butt-jointed with the chamfered edge 115 of the adjacent right battery cell 11. Of course, in this embodiment, left and right are relative concepts, and the chamfered edge 115 can also be placed on the right side, and the cut edge 116 can be placed on the left side. In this way, the installation of the battery cell 11 is easier.

[0079] Embodiment 10

[0080] See also Figure 6 The photovoltaic system 200 provided in the embodiment of the present application includes the back contact battery assembly 100 of any one of the above embodiments.

[0081] In the back contact battery assembly 100 and the photovoltaic system 200 of the embodiment of the present application, the back contact battery assembly 100 includes a battery string 10, an insulating strip 20 and a bus bar 30. The battery string 10 includes a plurality of battery cells 11 connected in series, and the plurality of battery cells 11 are distributed along a first direction. The insulating strip 20 is arranged on the backlight surface 113 of the battery cell 11 along a second direction, wherein the first direction and the second direction are arranged to intersect, and the bus bar 30 is arranged on the side of the insulating strip 20 away from the battery cell 11 along the second direction, and the insulating strip 20 covers the bus bar 30. In this way, the bus bar 30 is hidden in the backlight surface 113 of the plurality of battery cells 11, and the bus bar 30 cannot be observed from the light receiving surface 114 side, so that the overall color of the front of the back contact battery assembly 100 is uniform and beautiful. At the same time, the insulating strip 20 can be arranged between the bus bar 30 and the battery cell 11 to avoid short circuit problems.

[0082] In this embodiment, the photovoltaic system 200 can be applied to photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc., and can also be applied to equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it can be understood that the application scenarios of the photovoltaic system 200 are not limited to this, that is, the photovoltaic system 200 can be applied to all fields that require solar energy to generate electricity. Taking the photovoltaic power generation system network as an example, the photovoltaic system 200 may include a photovoltaic array, a junction box and an inverter. The photovoltaic array can be an array combination of multiple battery components. For example, multiple battery components can form multiple photovoltaic arrays. The photovoltaic array is connected to the junction box. The junction box can converge the current generated by the photovoltaic array. The converged current flows through the inverter and is converted into the alternating current required by the mains power grid and then connected to the mains network to achieve solar power supply.

[0083] In the description of this specification, the description with reference to the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0084] In addition, the above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A back contact battery assembly, characterized in that: include: A battery string, the battery string comprising a plurality of battery cells connected in series, the plurality of battery cells being distributed along a first direction; An insulating strip, wherein the insulating strip is arranged on the backlight surface of the battery cell along a second direction, wherein the first direction and the second direction are arranged to intersect; and A bus bar is arranged along the second direction on a side of the insulating strip away from the battery cell, and the insulating strip covers the bus bar.

2. The back contact battery assembly according to claim 1, characterized in that: The insulating strip covers the bus bar in the second direction; and the insulating strip covers and exceeds the bus bar in the first direction.

3. The back contact battery assembly according to claim 1, characterized in that: The back contact battery assembly further includes a welding ribbon, and the welding ribbon includes a first welding ribbon and a second welding ribbon, the first welding ribbon is used to connect the adjacent battery cells, and the second welding ribbon is used to connect the battery cells and the bus bar.

4. The back contact battery assembly according to claim 3, characterized in that: The second welding strip is arranged on a side of the bus bar away from the insulating strip or the second welding strip is arranged on a side of the bus bar close to the insulating strip.

5. The back contact battery assembly according to claim 3, characterized in that: The battery string includes a first battery cell and a second battery cell adjacent to each other. The insulating strip is arranged on the backlight surface of the first battery cell. The second welding strip connects the second battery cell and the bus bar respectively. The insulating strip blocks the second welding strip and the first battery cell.

6. The back contact battery assembly according to claim 5, characterized in that: The first battery cell and the second battery cell are at least partially stacked together.

7. The back contact battery assembly according to claim 6, characterized in that: When the backlight surface of the first cell and the light-receiving surface of the second cell are at least partially stacked together, the insulating strip is at least partially connected to the backlight surface of the second cell.

8. The back contact battery assembly according to claim 1, characterized in that: The battery cell is rectangular in shape and further includes a chamfered edge and a cut edge. The chamfered edge and the cut edge are distributed on both sides of the battery cell along the first direction. The first direction and the second direction are vertically arranged.

9. The back contact battery assembly according to claim 8, characterized in that: In the first direction, the chamfered edge of the battery cell is butted against the chamfered edge of an adjacent battery cell, and the cut edge of the battery cell is butted against the cut edge of an adjacent battery cell; or In the first direction, the chamfered edge of the battery cell is butted against the cut edge of the adjacent battery cell and the cut edge of the battery cell is butted against the chamfered edge of the adjacent battery cell.

10. A photovoltaic system, characterized in that: Comprising a back contact battery assembly as described in any one of claims 1-9.

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