Battery assembly and photovoltaic system

Abstract

The invention is suitable for the technical field of solar cells, and provides a cell module and a photovoltaic system, and the cell module comprises a back contact cell which comprises a first polarity grid line and a second polarity grid line; the plurality of first welding strips and the plurality of second welding strips are respectively connected with the first polarity grid line and the second polarity grid line; the insulating strip is arranged on the sides, deviating from the back contact battery, of the first welding strip and the second welding strip, and the insulating strip comprises a through hole; the bus bar is arranged on the side, away from the back contact battery, of the insulating strip, the bus bar is electrically isolated from the first welding strip through the insulating strip, and the bus bar is electrically connected with the second welding strip through the through hole; wherein the insulating strip is a flexible insulating strip and comprises an open hole part and a non-open hole part, the through hole is located in the open hole part, and the thickness of the open hole part is larger than that of the non-open hole part. According to the flexible insulating strip, the thicker opening part is arranged in the flexible insulating strip, so that a buffering effect is achieved during welding and subsequent lamination, and the risk of subfissure and fragment is reduced.

Description

Technical Field

[0001] This application belongs to the field of solar cell technology, and particularly relates to a battery module and photovoltaic system. Background Technology

[0002] In the fabrication of back-contact battery modules, an insulating strip is typically placed between the busbar and the solder ribbon to insulate the busbar from mismatched solder ribbons. However, the battery is prone to microcracks and breakage during soldering and subsequent lamination. Therefore, reducing the risk of microcracks and breakage during soldering and subsequent lamination has become an urgent problem to be solved.

[0003] Application content

[0004] This application provides a battery module and photovoltaic system, which aims to solve the problem of battery cells being prone to microcracks and fragmentation during welding and subsequent lamination.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] First, a battery assembly is provided, comprising:

[0007] The back contact battery includes a first polarity grid line and a second polarity grid line;

[0008] A plurality of first solder strips and a plurality of second solder strips are respectively connected to the first polarity gate line and the second polarity gate line;

[0009] An insulating strip is provided on the side of the first and second welding strips opposite to the back contact battery, and the insulating strip includes a through hole;

[0010] The busbar is located on the side of the insulating strip away from the back contact battery. The busbar is electrically isolated from the first solder strip through the insulating strip, and the busbar is electrically connected to the second solder strip through a through hole.

[0011] The insulating strip is a flexible insulating strip, which includes an open portion and a non-open portion. The through hole is located in the open portion, and the thickness of the open portion is greater than the thickness of the non-open portion.

[0012] In some embodiments, the shape of the through hole is one or more of the following: circular, quadrilateral, elliptical, and triangular.

[0013] In some embodiments, the dimension of the through hole in the width direction of the insulating strip is smaller than the width of the insulating strip.

[0014] In some embodiments, the number of through holes is 6-600.

[0015] In some embodiments, the number of through holes is 30-120.

[0016] In some embodiments, the length of the through hole in the width direction of the insulating strip is 2-6 mm.

[0017] In some embodiments, the thickness of the opening is 0.1-0.5 mm.

[0018] In some embodiments, the thickness of the non-perforated portion is 0.15-0.3 mm.

[0019] In some embodiments, the non-aperture portion includes a first non-aperture portion and a second non-aperture portion; the first non-aperture portion is the region in the non-aperture portion corresponding to the position of the first solder strip; the second non-aperture portion is the region in the non-aperture portion other than the first non-aperture portion; the thickness of the first non-aperture portion is less than the thickness of the second non-aperture portion.

[0020] In some embodiments, the thickness of the first non-perforated portion is 0.15-0.25 mm.

[0021] In some embodiments, the thickness of the second non-perforated portion is 0.2-0.3 mm.

[0022] Secondly, this application provides a photovoltaic system including any of the aforementioned battery components.

[0023] The beneficial effects of this application are as follows:

[0024] In the battery module and photovoltaic system of this application embodiment, the insulating strip is a flexible insulating strip, and the flexible insulating strip includes an open portion and a non-open portion, with the through hole located in the open portion, and the thickness of the open portion is greater than the thickness of the non-open portion. In this way, during welding and subsequent lamination, the thicker open portion in the flexible insulating strip can act as a buffer, reducing the risk of microcracks and fragmentation during welding and subsequent lamination. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a battery assembly according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the structure of a battery assembly according to another embodiment of this application.

[0027] Explanation of key component symbols: 100, battery assembly; 110, back contact battery; 120, first solder strip; 130, second solder strip; 140, insulating strip; 150, busbar; 141, opening; 142, non-opening; 1411, through hole; 1412, hole wall. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. Examples of 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 application, and should not be construed as limiting this application. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this application and are not intended to limit this application.

[0029] In the description of this application, 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, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0030] 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. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, unless otherwise expressly 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 being 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 being 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.

[0033] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. 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 this application. 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, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0034] In the battery module and photovoltaic system of this application embodiment, the insulating strip is a flexible insulating strip, and the flexible insulating strip includes an open portion and a non-open portion, with the through hole located in the open portion, and the thickness of the open portion is greater than the thickness of the non-open portion. In this way, during welding and subsequent lamination, the thicker open portion in the flexible insulating strip can act as a buffer, reducing the risk of microcracks and fragmentation during welding and subsequent lamination.

[0035] Please see Figure 1 and Figure 2 This application provides a battery assembly 100, comprising:

[0036] The back contact battery 110 includes a first polarity grid line and a second polarity grid line;

[0037] A plurality of first solder strips 120 and a plurality of second solder strips 130 are respectively connected to the first polarity grid line and the second polarity grid line of the same back contact pool 110;

[0038] An insulating strip 140 is provided on the side of the first welding strip 120 and the first welding strip 130 away from the back contact battery 110, and includes a through hole 1411;

[0039] Busbar 150 is disposed on the side of insulating strip 140 away from back contact battery 110. Busbar 150 is electrically isolated from first solder strip 120 through insulating strip 140. Busbar 150 is electrically connected to first solder strip 130 through through hole 1411.

[0040] In this configuration, the first polarity gate line and the second polarity gate line are gate lines with different polarities. For example, the first polarity gate line is a positive polarity gate line, and the second polarity gate line is a negative polarity gate line. Alternatively, the first polarity gate line is a negative polarity gate line, and the second polarity gate line is a positive polarity gate line.

[0041] The first polarity grid line and the second polarity grid line can be arranged alternately on the back side of the back contact battery 110. Furthermore, the distance from the first polarity grid line to each of the two adjacent second polarity grid lines is equal.

[0042] The first solder strip 120 is electrically connected to the first polarity grid line of the back contact battery 110 by means of welding or conductive adhesive. The second solder strip 130 is electrically connected to the second polarity grid line of the same back contact battery 110 by means of welding or conductive adhesive.

[0043] The materials of the first solder strip 120 and the first solder strip 130 include at least one of tin, lead, bismuth, silver, and rare earth elements.

[0044] The insulating strip 140 may include an opening portion 141 and a non-opening portion 142, with a through hole 1411 located in the opening portion 141, and the thickness of the opening portion 141 being greater than the thickness of the non-opening portion 142.

[0045] The opening portion 141 includes a through hole 1411 and a hole wall portion 1412.

[0046] The hole wall portion 1412 is the area on the insulating strip 140 that is less than or equal to a preset threshold distance from the edge of the through hole 1411.

[0047] The preset threshold is 0.5-1mm. In such an embodiment, the preset threshold can be any value between 0.5mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 1mm or 0.5mm-1mm, and there is no specific limitation here.

[0048] Thus, setting the preset threshold between 0.5-1mm ensures that the size of the hole wall portion 1412 is within a suitable range. If the preset threshold is set less than 0.5mm, the hole wall portion 1412 is too small, and the opening portion cannot provide a buffering effect. If the preset threshold is set greater than 1mm, the corresponding through hole 1411 may be too large, increasing the probability of the insulating strip 140 breaking. Therefore, setting the thickness of the solder strip body 100 between 0.5mm and 1mm serves two purposes: firstly, it allows the opening portion 141 to act as a buffer, reducing the risk of microcracks and fragmentation during welding and subsequent lamination; secondly, it reduces the probability of the insulating strip 140 breaking, increasing the reliability of the battery assembly 100.

[0049] In practical applications, the preset threshold is positively correlated with the maximum width of the through hole 1411.

[0050] In one example, the ratio of the preset threshold to the maximum width of the through hole 1411 is 0.1-0.3. In such an embodiment, the ratio of the preset threshold to the maximum width of the through hole 1411 can be any value between 0.1, 0.15, 0.2, 0.25, 0.3, or 0.1-0.3, and is not specifically limited herein.

[0051] Thus, by setting the ratio of the preset threshold to the maximum width of the through hole 1411 between 0.1 and 0.3, the ratio is kept within a suitable range. If the ratio is less than 0.1, a larger through hole 1411 is required to prevent the hole wall portion 1412 from being too small, which would increase the probability of the insulating strip 140 breaking. If the ratio is greater than 0.3, it may cause an increase in stress on the insulating strip 140, which could lead to embrittlement. Therefore, setting the ratio of the preset threshold to the maximum width of the through hole 1411 between 0.1 and 0.3 reduces the probability of the insulating strip 140 breaking and prevents it from becoming embrittled, thereby increasing the reliability of the battery assembly 100.

[0052] The insulating strip 140 is a heat-shrinkable insulating strip. In other words, the insulating strip is made of a heat-shrinkable material. For example, the heat-shrinkable material can be at least one of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), and ethylene-vinyl acetate copolymer (EVA).

[0053] Understandably, the insulating strip is made of a heat-shrinkable material, which can form through holes 1411 when locally heated. This eliminates the need to cut the insulating strip, thus avoiding the problem of adhesion and pulling, and improving the accuracy of the hole placement.

[0054] In some embodiments, the through hole 1411 can be prepared by laser drilling.

[0055] For example, when the laser irradiates the insulating strip 140, the laser irradiation area expands outward from the small hole to form a through hole 1411 with a thickness greater than that of the non-opening part 142.

[0056] In some other embodiments, the through hole 1411 can be prepared by laser drilling and local thermal expansion or simultaneous thermal welding.

[0057] For example, when the laser irradiates the insulating strip 140, the laser irradiation area expands outward from the small hole as the center to form a small hole. Furthermore, with the local heat treatment of the auxiliary hot welding probe, the area of ​​the small hole can be expanded to a suitable value, forming a through hole 1411 with a thickness of the open portion 141 greater than the thickness of the non-open portion 142.

[0058] In practical applications, the process of expanding the aperture area to a suitable value can be achieved by adjusting at least one of the following parameters: welding head temperature, welding time, insulating strip material, degree of polymerization, etc.; or by changing the shape of the welding head to change the aperture shape.

[0059] In this way, there is no need to cut the insulating strip 140, and there is no problem of adhesion and pulling, which can improve the accuracy of the opening position. In addition, the busbar 150 and the first solder strip 120 are electrically isolated by the insulating strip 140. Due to the improved accuracy of the opening position, the welding effect between the busbar 150 and the solder strip and the reliability of the battery module 100 can be improved.

[0060] The through hole 1411 of the insulating strip 140 is provided in the overlapping area of ​​the busbar 150 and the first solder strip 130, so that the busbar 150 and the first solder strip 130 are electrically connected through the through hole 1411.

[0061] The busbar 150 can be an end busbar 150 or an intermediate busbar 150.

[0062] The following describes several structures in which the busbar 150 and the first solder strip 130 are electrically connected through the through hole 1411:

[0063] 1. An independent electrical connector is provided inside the through hole 1411.

[0064] An electrical connector is provided in each through hole 1411. The electrical connector is used to electrically connect the busbar 150 and the first solder strip 130. One end of the electrical connector is electrically connected to the busbar 150, and the other end of the electrical connector is electrically connected to the first solder strip 130.

[0065] In one example, the electrical connector can be at least one of conductive metals such as copper and aluminum.

[0066] 2. Electrical connectors are provided on the busbar 150.

[0067] The busbar 150 has multiple electrical connectors, each of which is electrically connected to the first solder strip 130 through a through hole 1411.

[0068] 3. Electrical connectors are provided on the first welding strip 130.

[0069] The first welding strip 130 has multiple electrical connectors, each of which is electrically connected to the busbar 150 through a through hole 1411.

[0070] 4. Electrical connectors are provided on both the first welding strip 130 and the busbar 150.

[0071] The electrical connectors of the first solder strip 130 and the electrical connectors on the busbar 150 are electrically connected in the through hole 1411, so that the busbar 150 and the first solder strip 130 are electrically connected through the through hole 1411.

[0072] 5. The busbar 150 passes through the through hole 1411 and is electrically connected to the first welding strip 130.

[0073] 6. The first welding strip 130 passes through the through hole 1411 and is electrically connected to the busbar 150.

[0074] It should be noted that the ratio of the length of the electrical connector on the first solder strip 130 to the length of the electrical connector on the busbar 150 can be set as needed. For example, it can be 0.1-0.9. In such an embodiment, the ratio of the length of the electrical connector on the first solder strip 130 to the length of the electrical connector on the busbar 150 can be any value between 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 0.1-0.9, and is not specifically limited here. In this way, the electrical connectors on both the first solder strip 130 and the busbar 150 extend to the through hole 1411, which can improve the reliability of the connection between the first solder strip 130 and the busbar 150.

[0075] In some embodiments, the through hole 1411 is shaped as one or more of a circle, a quadrilateral, an ellipse, or a triangle.

[0076] The quadrilateral can be a square, rectangle, rhombus, trapezoid, etc.

[0077] In such an embodiment, the through holes 1411 can all be circular, or all be quadrilateral, or all be elliptical, or all be triangular, or the through holes 1411 can be circular, quadrilateral, elliptical, or triangular, and the circular, quadrilateral, elliptical, and triangular through holes 1411 are arranged in sequence, without any specific limitation.

[0078] Understandably, by setting through holes 1411 of different shapes, the manufacturing process of the battery module 100 can be adapted to improve the efficiency and applicability of the battery module 100 manufacturing process.

[0079] In some embodiments, the length of the through hole 1411 in the width direction of the insulating strip 140 is less than the width of the insulating strip 140.

[0080] This prevents the insulating strip 140 from breaking and ensures its insulation performance.

[0081] In some embodiments, the width of the insulating strip 140 is greater than the width of the busbar 150.

[0082] In this way, the insulating strip 140 can cover the edge of the busbar 150, and the insulating strip 140 can completely isolate the area in the busbar 150 that needs to be insulated, thus ensuring the insulation performance of the insulating strip 140.

[0083] The difference between the width of the insulating strip 140 and the width of the busbar 150 is less than or equal to 4 mm and greater than or equal to 1 mm. In such an embodiment, the difference between the width of the insulating strip 140 and the width of the busbar 150 can be any value between 1 mm, 2 mm, 3 mm, 4 mm, or 1 mm and 4 mm, and is not specifically limited here.

[0084] Therefore, setting the difference between the width of the insulating strip 140 and the width of the busbar 150 to between 1 and 4 mm ensures that the difference is within a suitable range. If the difference is less than 1 mm, slight relative displacement of the materials in each layer may occur under high temperature and pressure during lamination, increasing the probability of contact between the busbar 150 and the underlying circuit. If the difference is greater than 4 mm, the excessively wide insulating strip will occupy valuable area around the solar cells, reducing the effective power generation area of ​​the module and lowering the power generation efficiency of the solar module. Therefore, setting the difference between the width of the insulating strip 140 and the width of the busbar 150 to between 1 and 4 mm ensures the insulation performance of the insulating strip 140 while reducing the area occupied by the insulating strip on the solar cells, thus increasing the power generation efficiency of the solar module.

[0085] In some embodiments, the number of through holes 1411 is 6-600.

[0086] The number of through holes 1411 can be determined based on the number of first solder strips 130 in the back contact battery 110. For example, the number of through holes 1411 is less than or equal to 600 and greater than or equal to 6. In such an embodiment, the number of through holes 1411 can be any value between 6 and 600, and is not limited here.

[0087] In some embodiments, the number of through holes 1411 is 30-120.

[0088] In such an embodiment, the number of through holes 1411 can be any value between 30 and 120, and there is no specific limitation here.

[0089] In some embodiments, the length L of the through hole 1411 in the width direction of the insulating strip 140 is 2-6 mm. In such embodiments, the length L of the through hole 1411 in the width direction of the insulating strip 140 can be any value between 2 mm, 3 mm, 4 mm, 5 mm, 6 mm or 2 mm-6 mm, and is not specifically limited herein.

[0090] Thus, setting the length L of the through hole 1411 in the width direction of the insulating strip 140 to between 2 and 6 mm ensures that the length L is within a suitable range. If the length L is less than 2 mm, it may lead to increased resistance between the width of the insulating strip 140 and the busbar 150, making alignment difficult. If the length L is greater than 6 mm, significant stress concentration occurs at the corner of the hole, which may become the starting point for fatigue fracture of the busbar or the insulating strip itself during module lamination or thermal expansion and contraction in use. Therefore, setting the length L of the through hole 1411 in the width direction of the insulating strip 140 to between 2 and 6 mm avoids excessive resistance between the width of the insulating strip 140 and the busbar 150, reducing the difficulty of aligning the insulating strip 140 and the busbar 150 with the through hole 1411. On the other hand, it reduces significant stress concentration at the corner of the hole, increasing the reliability of the battery module.

[0091] In some embodiments, the thickness of the opening 141 is 0.1-0.5 mm.

[0092] In such an embodiment, the thickness of the opening 141 can be any value between 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm or 0.1-0.5 mm, and is not specifically limited here.

[0093] Understandably, the thicker opening 141 in the insulating strip can act as a buffer during welding and subsequent lamination, reducing the risk of microcracks and fragmentation during welding and subsequent lamination.

[0094] In some embodiments, the thickness of the non-perforated portion 142 is 0.15-0.3 mm.

[0095] In such an embodiment, the thickness of the non-perforated portion 142 can be any value between 0.15mm, 0.2mm, 0.25mm, 0.3mm, or 0.15mm-0.3mm, and is not specifically limited herein.

[0096] Understandably, the thickness of the non-perforated portion 142 is between 0.15 and 0.3 mm, which can reduce the amount of material used in the preparation of the insulating strip and lower the preparation cost while ensuring insulation performance.

[0097] In some embodiments, the non-aperture portion 142 includes a first non-aperture portion 142 and a second non-aperture portion 142; the first non-aperture portion 142 is the region in the non-aperture portion 142 corresponding to the position of the first solder strip 120; the second non-aperture portion 142 is the region in the non-aperture portion 142 other than the first non-aperture portion 142; the thickness of the first non-aperture portion 142 is less than the thickness of the second non-aperture portion 142.

[0098] The area in the non-hole portion 142 corresponding to the position of the first solder strip 120 can be the area corresponding to the orthographic projection of the first solder strip 120 on the insulating strip 140.

[0099] Understandably, since the area in the non-aperture portion 142 corresponding to the position of the first solder strip 120 has an additional height compared to other areas without solder strips (i.e., the height of the first solder strip 120), the thickness of the first non-aperture portion 142 is less than the thickness of the second non-aperture portion 142, which can make the surface of the insulating strip 140 smoother and improve the reliability of the battery assembly 100.

[0100] In some embodiments, the thickness of the first non-perforated portion 142 is 0.15-0.25 mm. In such embodiments, the thickness of the first non-perforated portion 142 can be any value between 0.15 mm, 0.17 mm, 0.2 mm, 0.23 mm, 0.25 mm, or 0.15 mm-0.25 mm, and is not specifically limited herein.

[0101] Thus, by setting the thickness of the first non-perforated portion 142 between 0.15 and 0.25 mm, the thickness of the first non-perforated portion 142 is within a suitable range. If the thickness is less than 0.15 mm, the first non-perforated portion 142 may be punctured; if the thickness is greater than 0.25 mm, the height difference between the first non-perforated portion 142 and other areas may be too large, resulting in an uneven surface of the insulating strip 140. Therefore, setting the thickness of the first non-perforated portion 142 between 0.15 and 0.25 mm improves the insulation performance of the insulating strip 140 and reduces the height difference between the first non-perforated portion 142 and other areas, thereby improving the smoothness of the surface of the insulating strip 140.

[0102] In some embodiments, the thickness of the second non-perforated portion 142 is 0.2-0.3 mm. In such embodiments, the length of the through hole 1411 in the width direction of the insulating strip 140 can be any value between 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, 0.3 mm, or 0.2 mm-0.3 mm, and is not specifically limited herein.

[0103] Thus, the thickness of the second non-perforated portion 142 is between 0.2-0.3 mm, which keeps the thickness within a suitable range. If the thickness is less than 0.2 mm, the second non-perforated portion 142 may be punctured; if the thickness is greater than 0.25 mm, the height difference between the first non-perforated portion 142 and other areas may be too large, resulting in an uneven surface of the insulating strip 140. Therefore, setting the thickness of the first non-perforated portion 142 to between 0.15-0.25 mm improves the insulation performance of the insulating strip 140 and reduces the height difference between the first non-perforated portion 142 and other areas, thereby improving the smoothness of the insulating strip 140 surface.

[0104] In some embodiments, the back contact battery 110 includes an adjacent first battery cell and a second battery cell, an insulating strip 140 is disposed on the back surface of the first battery cell, a first solder strip 130 connects the first battery cell and the busbar 150 respectively, and the insulating strip 140 blocks the first solder strip 120.

[0105] Specifically, the specifications of the first and second solar cells can be the same or different; the structures of the first and second solar cells can be the same or different. No specific limitations are made regarding the relationship between the first and second solar cells.

[0106] In some embodiments, the first and second battery cells may be stacked together at least partially.

[0107] In this way, the battery module 100 can make full use of the module space, put the battery into the gap between the previous battery cells, and avoid the gap between the first battery cell and the second battery cell exposing components such as the solder strip and busbar 150.

[0108] In another embodiment, the second battery cell and the first battery cell can be spaced apart. The distance between the second battery cell and the first battery cell is 1-3 mm. In such an embodiment, the distance between the second battery cell and the first battery cell can be any value between 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, or 1 mm - 3 mm, and there is no specific limitation here.

[0109] This avoids the problem of insufficient operating space and difficult welding caused by excessively small spacing, and also avoids the problem of wasted component space and increased costs caused by excessively large spacing.

[0110] In some embodiments, the backlight surface of the first battery cell and the light-receiving surface of the second battery cell overlap, resulting in no gap between them. An insulating strip 140 is disposed on the backlight surface of the first battery cell, and the portion of the insulating strip 140 near the edge of the second battery cell is attached to the backlight surface of the second battery cell. In this case, the solder ribbon located on the backlight surface of the second battery cell can be blocked by the insulating strip 140, allowing the solder ribbon to be stably connected to the busbar 150 and preventing short circuits between the first battery cell and the solder ribbon or the busbar 150.

[0111] Of course, in other embodiments, the light-receiving surface of the first battery cell and the backlighting surface of the second battery cell may be at least partially stacked together, and no specific limitation is made here.

[0112] In this embodiment, multiple solar cells in the battery assembly 100 can be connected in series to form a battery string, thereby realizing the series current collection and output. For example, the battery cells can be connected in series by setting solder strips (busbars 150, interconnecting strips), conductive backplates, etc.

[0113] It is understood that in such embodiments, the battery module 100 may further include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled between the front and back of the solar cells, the photovoltaic glass, adjacent cells, etc. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film may be an EVA film or a POE film, and the specific choice can be made according to the actual situation, without limitation.

[0114] Photovoltaic glass can be applied to the encapsulating film on the front of solar cells. 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 solar cells while minimizing impact on their efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the solar cells together, providing sealing, insulation, and waterproofing / moisture protection for the solar cells.

[0115] The backsheet can be attached to the encapsulant film on the back of the solar cell. The backsheet protects and supports the 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 encapsulant film, etc., and the specific choice depends on the specific circumstances and is not limited here. The backsheet, solar cell, encapsulant film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire battery module 100, providing stable support and installation for the module. For example, the battery module 100 can be installed at the desired location using the metal frame.

[0116] The photovoltaic system of this application embodiment includes the battery module 100 described above.

[0117] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to 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 is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy for power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple battery modules 100. For example, multiple battery modules 100 can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0118] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0119] Furthermore, the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery assembly, characterized in that, include: The back contact battery includes a first polarity grid line and a second polarity grid line; A plurality of first solder strips and a plurality of second solder strips are respectively connected to the first polarity gate line and the second polarity gate line; An insulating strip is disposed on the side of the first and second solder strips opposite to the back contact battery, and the insulating strip includes a through hole; A busbar is disposed on the side of the insulating strip opposite to the back contact battery. The busbar is electrically isolated from the first solder strip through the insulating strip, and the busbar is electrically connected to the second solder strip through the through hole. The insulating strip is a flexible insulating strip, including an open portion and a non-open portion. The through hole is located in the open portion, and the thickness of the open portion is greater than the thickness of the non-open portion.

2. The battery assembly according to claim 1, characterized in that, The shape of the through hole is one or more of the following: circular, quadrilateral, elliptical, and triangular.

3. The battery assembly according to claim 1, characterized in that, The length of the through hole in the width direction of the insulating strip is less than the width of the insulating strip.

4. The battery assembly according to claim 1, characterized in that, The number of through holes is 6-600.

5. The battery assembly according to claim 1, characterized in that, The number of through holes is 30-120.

6. The battery assembly according to claim 1, characterized in that, The length of the through hole in the width direction of the insulating strip is 2-6 mm.

7. The battery assembly according to claim 1, characterized in that, The thickness of the opening is 0.1-0.5 mm.

8. The battery assembly according to claim 1, characterized in that, The thickness of the non-perforated portion is 0.15-0.3 mm.

9. The battery assembly according to claim 1, characterized in that, The non-aperture portion includes a first non-aperture portion and a second non-aperture portion; the first non-aperture portion is the area in the non-aperture portion corresponding to the position of the first solder strip; the second non-aperture portion is the area in the non-aperture portion excluding the first non-aperture portion; the thickness of the first non-aperture portion is less than the thickness of the second non-aperture portion.

10. The battery assembly according to claim 9, characterized in that, The thickness of the first non-perforated portion is 0.15-0.25 mm.

11. The battery assembly according to claim 9, characterized in that, The thickness of the second non-perforated portion is 0.2-0.3 mm.

12. A photovoltaic system, characterized in that, The photovoltaic system includes the battery module as described in any one of claims 1-11.

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