Composite welding strip, battery string, battery assembly and photovoltaic system

Abstract

The invention is suitable for the technical field of solar cells, and provides a composite welding strip, a cell string, a cell module and a photovoltaic system. The composite welding strip comprises a first welding strip, an insulating strip and a second welding strip, and the first welding strip, the insulating strip and the second welding strip extend in the first direction and are sequentially arranged in a contact mode in the second direction. The first welding strip comprises a first conductive part and a plurality of first insulating parts, the first insulating parts are arranged on the first conductive part and distributed at intervals in the first direction, and the first conductive part is exposed out of the position between every two adjacent first insulating parts to form a first battery connecting area. Therefore, the first welding strip and the second welding strip are integrated together through the insulating tape, so that the arrangement frequency of the welding strips can be reduced; the first welding strip comprises the first insulating parts which are sequentially distributed at intervals, so that the first conductive parts are exposed between the two adjacent first insulating parts to form the first battery connecting areas, and the operation of insulating the welding strip from the non-corresponding grid lines one by one can be omitted. Therefore, the connection step of the welding strip and the battery piece can be simplified.

Description

Technical Field

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

[0002] Solar cell power generation is a sustainable and clean energy source that uses the photovoltaic effect to convert sunlight into electricity.

[0003] In related technologies, solder ribbons connect the first polarity grid line of a solar cell to the second polarity grid line of an adjacent solar cell, thereby electrically connecting the two adjacent solar cells. However, the grid lines of solar cells are relatively dense, and connecting the solder ribbon to each corresponding grid line and insulating the solder ribbon from each non-corresponding grid line is quite cumbersome.

[0004] Therefore, how to design a solder strip structure to simplify the connection steps between the solder strip and the battery cell has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a composite solder strip, a battery string, a battery module, and a photovoltaic system, aiming to solve the problem of how to design a solder strip structure to simplify the connection steps between the solder strip and the battery cells.

[0006] This application provides a composite welding strip, including a first welding strip, an insulating strip, and a second welding strip, wherein the first welding strip, the insulating strip, and the second welding strip extend along a first direction and are arranged in contact with each other along a second direction; The first solder strip includes a first conductive element and a plurality of first insulating elements. The first insulating elements are disposed on the first conductive element and are distributed at intervals along the first direction. The first conductive elements are exposed between two adjacent first insulating elements to form a first battery connection area.

[0007] Furthermore, the second solder strip includes a second conductive element and a plurality of second insulating elements. The second insulating elements are disposed on the second conductive element and are spaced apart along the first direction. The second conductive elements are exposed between two adjacent second insulating elements to form a second battery connection area.

[0008] Furthermore, the second insulating member and the first insulating member are arranged alternately along the first direction, and the first battery connection area and the second battery connection area are arranged alternately.

[0009] Furthermore, the insulating tape includes a body segment located between the first solder strip and the second solder strip, electrically isolating the first solder strip and the second solder strip.

[0010] Furthermore, the second solder strip partially overlaps with the first solder strip along the second direction.

[0011] Furthermore, the insulating tape includes an extension section that extends outward from the body section.

[0012] Furthermore, the insulating strip includes a support section located between the body section and the battery cell.

[0013] This application provides a battery string comprising a plurality of battery cells and a composite solder strip as described in any of the above claims. The battery cells include a first polarity grid line and a second polarity grid line. The first solder strip of the composite solder strip is connected to the first polarity grid line, and the second solder strip of the composite solder strip is connected to the second polarity grid line.

[0014] This application provides a battery assembly comprising any of the battery strings described above.

[0015] This application provides a photovoltaic system including the battery modules described above.

[0016] The composite solder strip of this application embodiment reduces the frequency of solder strip arrangement because it integrates the first solder strip and the second solder strip together with an insulating strip. Since the first solder strip includes sequentially spaced first insulating members, allowing the first conductive members to be exposed between adjacent first insulating members to form a first battery connection area, the operation of insulating the first solder strip from each non-corresponding grid line can be omitted. This simplifies the connection steps between the solder strip and the battery cell. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first structure of the composite solder strip according to an embodiment of this application; Figure 2 This is a schematic diagram of another perspective of the first structure of the composite solder strip according to an embodiment of this application; Figure 3 This is a cross-sectional schematic diagram of a first structure of a composite welding strip according to an embodiment of this application; Figure 4 This is a schematic diagram of the first structural installation of the composite welding strip according to an embodiment of this application; Figure 5 This is a schematic diagram of a second structure of the composite solder strip according to an embodiment of this application; Figure 6 This is a schematic diagram of another perspective of the second structure of the composite solder strip according to an embodiment of this application; Figure 7 This is a cross-sectional schematic diagram of a second structure of the composite welding strip according to an embodiment of this application; Figure 8 This is a schematic diagram of the second structural installation of the composite welding strip according to an embodiment of this application.

[0018] Explanation of key component symbols: 1000-battery string; 100-Composite welding strip, 11-First welding strip, 111-First conductive component, 112-First insulating component, 113-First battery connection area, 12-Insulating strip, 121-Body segment, 122-Extension segment, 123-Support segment, 13-Second welding strip, 131-Second conductive component, 132-Second insulating component, 133-Second battery connection area; 200-cell battery. Detailed Implementation

[0019] 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 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 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.

[0020] 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.

[0021] 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 application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Please see Figure 1 or Figure 5 The composite solder strip 100 in this application embodiment includes a first solder strip 11, an insulating strip 12 and a second solder strip 13. The first solder strip 11, the insulating strip 12 and the second solder strip 13 extend along a first direction and are arranged in contact with each other along a second direction. The first solder strip 11 includes a first conductive element 111 and a plurality of first insulating elements 112. The first insulating elements 112 are disposed on the first conductive element 111 and are distributed at intervals along the first direction. The first conductive element 111 is exposed between two adjacent first insulating elements 112 to form a first battery connection area 113.

[0026] Thus, by integrating the first solder strip 11 and the second solder strip 13 together via the insulating tape 12, the frequency of solder strip arrangement can be reduced. Since the first solder strip 11 includes sequentially spaced first insulating elements 112, the first conductive element 111 is exposed between adjacent first insulating elements 112, forming the first battery connection area 113, eliminating the need for additional insulating elements. Therefore, the operation of insulating the first solder strip 11 from each non-corresponding grid line can be omitted. This simplifies the connection steps between the composite solder strip 100 and the battery cell 200.

[0027] Specifically, the first welding strip 11, the insulating strip 12, and the second welding strip 13 are all strip-shaped. The first welding strip 11, the insulating strip 12, and the second welding strip 13 extend along the first direction and are arranged in contact with each other along the second direction to form a composite welding strip 100.

[0028] Specifically, in this embodiment, the first direction and the second direction are perpendicular. The first direction refers to the length direction of the composite solder strip 100, the first solder strip 11, the insulating strip 12, and the second solder strip 13, while the second direction refers to the width direction of the composite solder strip 100, the first solder strip 11, the insulating strip 12, and the second solder strip 13. Simultaneously, the first and second directions can also be parallel to two adjacent long sides of the battery cell 200, such that the first direction is perpendicular to the extension direction of the grid lines of the battery cell 200, and the second direction is parallel to the extension direction of the grid lines.

[0029] In some other embodiments, the second direction may intersect with the first direction. That is, the second direction and the first direction do not overlap, are not the same, and are not opposite. This is not a limitation.

[0030] Furthermore, in some other embodiments, the first direction and the second direction may also form an acute angle or an obtuse angle; the first direction and the second direction may also form an acute angle or an obtuse angle with the two adjacent long sides of the battery cell 200, respectively. No limitation is imposed here.

[0031] Please note that the "two adjacent long sides" mentioned above refers to the sides other than the corners of the solar cell 200, excluding the rounded or chamfered arc edges or short sides formed by the corners of the solar cell 200.

[0032] Specifically, the first solder strip 11 includes a first conductive element 111 and a plurality of first insulating elements 112. The first insulating elements 112 are disposed on the side of the first solder strip 11 near the solar cell 200 and cover the grid lines that do not correspond to the first solder strip 11. Thus, after the first solder strip 11 is connected to the solar cell 200, the first insulating elements 112 complete the insulation of the first solder strip 11 from each of the non-corresponding grid lines. This simplifies the connection steps between the composite solder strip 100 and the solar cell 200.

[0033] Specifically, the first conductive element 111 may include a core and a flux layer covering the core. The flux layer may cover all or part of the surface of the core. For example, the flux layer may cover all surfaces of the core facing the battery cell 200 and all surfaces facing away from the battery cell 200, but not the sides of the core. Alternatively, the flux layer may cover the entire surface of the core.

[0034] Specifically, the cross-section of the core can be rectangular, triangular, circular, or other irregularly shaped. No limitation is made here. The core can be a copper core, an aluminum core, or other metal core with good electrical conductivity. The flux layer can be a tin layer, a tin alloy layer, or other flux layer with good soldering properties. No limitation is made here.

[0035] Specifically, the cross-section of the core can be an irregular shape. For example, in Figure 3 or Figure 6 In the example, the cross-section of the core may include multiple rectangles arranged sequentially and at angles to each other. Thus, the cross-section of the core has an irregular shape including at least one bend. With the cross-sectional area of ​​the solder strip and the contact area between the solder strip and the cell surface (such as pads, PADs, etc.) remaining constant, the solder strip can maintain the same or similar conductivity. In this case, the solder strip of the core with the irregular cross-section typically has a smaller width dimension (i.e., the dimension in the second direction), thereby reducing shading loss to the cell 200.

[0036] Specifically, the thickness of the flux layer is 0.01mm-0.1mm. For example, 0.01mm, 0.02mm, 0.05mm, 0.08mm, and 0.1mm. This ensures that the flux layer thickness is within a suitable range, avoiding poor soldering results due to an excessively thin flux layer, and also avoiding material waste and increased costs due to an excessively thick flux layer.

[0037] Specifically, the flux layer can be a pure tin layer or a tin alloy layer. The tin alloy layer includes, but is not limited to, at least one of SnPb, SnBi, and SnAg layers. No specific type of flux layer is limited here.

[0038] Specifically, a first insulating member 112 is disposed on a first conductive member 111 and is distributed at intervals along a first direction. The first conductive member 111 is exposed between two adjacent first insulating members 112, forming a first battery connection area 113. In this way, the first insulating members 112 and the first battery connection area 113 are alternately distributed along the first direction, and the position of the first battery connection area 113 corresponds one-to-one with the corresponding grid line, which facilitates the connection of the first battery connection area 113 with the battery cell 200; the position of the first insulating member 112 corresponds one-to-one with the non-corresponding grid line, thereby achieving electrical isolation from the battery cell 200.

[0039] Specifically, the first insulating element 112 can be integrally formed with the insulating tape 12. This simplifies the manufacturing process of the composite welding tape 100. In some other embodiments, the first insulating element 112 may only be in contact with the insulating tape 12 or may not be in contact with it. This is not limited here.

[0040] Specifically, the first solder strip 11 can be electrically connected to the battery cell 200 through the first battery connection area 113. For example, the electrical connection can be achieved by at least one of conductive adhesive bonding, direct soldering, solder paste soldering, or physical contact. No limitation is made here.

[0041] Please see Figure 2 or Figure 6In some embodiments, the second solder strip 13 includes a second conductive element 131 and a plurality of second insulating elements 132. The second insulating elements 132 are disposed on the second conductive element 131 and are spaced apart along a first direction. The second conductive element 131 is exposed between two adjacent second insulating elements 132 to form a second battery connection area 133.

[0042] Thus, the second battery connection area 133 and the first battery connection area 113 are separated on both sides of the composite solder strip 100 by the insulating tape 12, and are used to connect to the grid lines of different polarities on the surface of the battery cell 200, respectively. After the composite solder strip 100 and the battery cell 200 are connected, it is not necessary to apply additional insulating adhesive to the first conductive element 111, the second conductive element 131 and the surface of the battery cell 200, simplifying the connection steps between the composite solder strip 100 and the battery cell 200.

[0043] Specifically, the second solder strip 13 can be electrically connected to the battery cell 200 through the second battery connection area 133. For example, the electrical connection can be achieved through at least one of conductive adhesive bonding, direct soldering, solder paste soldering, or physical contact. No limitation is made here.

[0044] Specifically, the sides of the first solder strip 11 and the second solder strip 13 closest to the solar cell 200 are kept flush. This ensures that the welding surfaces of the first solder strip 11 and the second solder strip 13 closest to the solar cell 200 are kept flush, making the contact resistance between the composite solder strip 100 and the solar cell 200 more consistent and stable, and the stress distribution more uniform.

[0045] Furthermore, the second insulating element 132 can be integrally formed with the insulating tape 12. This further simplifies the manufacturing process of the composite welding tape 100. In some other embodiments, the second insulating element 132 may only be in contact with the insulating tape 12 or may not be in contact with it. This is not limited here.

[0046] Please see Figure 2 or Figure 6 In some embodiments, the second insulating member 132 and the first insulating member 112 are arranged alternately along a first direction, and the first battery connection area 113 and the second battery connection area 133 are arranged alternately. That is, the first battery connection area 113 and the second insulating member 132 correspond one-to-one, the second battery connection area 133 and the first insulating member 112 correspond one-to-one, and are arranged alternately along the first direction.

[0047] In this way, any grid line of a solar cell passing through the composite solder ribbon 100 along the second direction is connected only to the first battery connection area 113 or only to the second battery connection area 133, while the corresponding second insulating member 132 or first insulating member 112 electrically isolates the corresponding second conductive member 131 or first conductive member 111. This allows the composite solder ribbon 100 to connect the corresponding grid lines one by one without the need for additional insulation of non-corresponding grid lines. Therefore, the operation of insulating the solder ribbon from non-corresponding grid lines can be omitted, thus simplifying the connection steps between the solder ribbon and the solar cell.

[0048] Specifically, the second insulating member 132 and the first insulating member 112 are arranged alternately at equal intervals along the first direction, or they can be arranged alternately at unequal intervals. It is sufficient that the first battery connection area 113 and the second battery connection area 133 alternately correspond to grid lines of different polarities. No limitation is made here.

[0049] Please see Figure 3 or Figure 7 In some embodiments, the insulating tape 12 includes a body segment 121 located between the first solder strip 11 and the second solder strip 13, electrically isolating the first solder strip 11 and the second solder strip 13. Thus, the insulating tape 12 reduces the risk of short circuits or breakdowns in the integrated first solder strip 11 and the second solder strip 13.

[0050] Specifically, the first welding strip 11 and the second welding strip 13 can be symmetrically arranged on both sides of the insulating strip 12, or they can be arranged asymmetrically. No limitation is made here.

[0051] Specifically, the areas where the first insulating element 112, the second insulating element 132, and the insulating tape 12 contact the battery cell 200 can be coated with a fixing adhesive layer. The adhesive layer can be applied during the production of the composite welding ribbon 100 or before field use. No limitation is made here. This ensures that the composite welding ribbon 100 remains fixed during welding to the battery cell 200, preventing positional shifts and reducing the occurrence of incomplete or poor welds, thus ensuring the accuracy of the welding position of the composite welding ribbon 100.

[0052] Specifically, the area of ​​the adhesive layer can be the entire area where the first insulating member 112, the second insulating member 132, and the insulating tape 12 contact the battery cell 200, or it can be a portion of the area where the first insulating member 112, the second insulating member 132, and the insulating tape 12 contact the battery cell 200. Ideally, the adhesive layer should exist in at least three contact areas, and the adhesive layer in these three contact areas should be triangularly distributed. No further limitation is made here. This ensures that the composite welding tape 100 does not shift when connecting to the battery cell 200, maintaining stability and thus guaranteeing a stable and accurate connection.

[0053] Please see Figure 1, Figure 3 In some embodiments, the second solder strip 13 partially overlaps with the first solder strip 11 along the second direction.

[0054] In this way, the width of the entire composite solder ribbon 100 is less than the sum of the widths of the first solder ribbon 11 and the second solder ribbon 13, thereby reducing the light-shielding damage of the composite solder ribbon 100 to the solar cell 200 and improving the photoelectric conversion efficiency of the solar cell 200.

[0055] exist Figure 3 In the example, the core of the first solder strip 11 has an irregular cross-section with at least one bend, and the core of the second solder strip 13 has a rectangular cross-section. One side of the second solder strip 13 and the body segment 121 of the insulating strip 12 are both accommodated within the space of the bend. Thus, the second solder strip 13 and the first solder strip 11 partially overlap along the second direction, making the width of the composite solder strip 100 less than the sum of the widths of the first solder strip 11 and the second solder strip 13, thereby reducing the light-shielding loss of the battery cell 200 by the composite solder strip 100.

[0056] Please see Figure 3 or Figure 7 In some embodiments, the insulating tape 12 includes an extension 122 that extends outward from the body section 121.

[0057] Thus, due to the setting of the extension section 122, the partial discharge phenomenon between the two end faces of the first solder strip 11 and the second solder strip 13 that are close to each other on the side away from the battery cell is reduced, thereby reducing the risk of internal short circuit of the composite solder strip 100.

[0058] Specifically, the extension 122 may cover part of the first solder strip 11, part of the second solder strip 13, and may extend along the centerline of the first solder strip 11 and the second solder strip 13. It is only necessary to enhance the insulation between the two end faces of the first solder strip 11 and the second solder strip 13 that are closer together. No further limitations are imposed here.

[0059] Please see Figure 3 or Figure 7 In some embodiments, the insulating strip 12 includes a support section 123 located between the body section 121 and the battery cell 200.

[0060] Thus, the support segment 123 fills the gap between the composite solder ribbon 100 and the solar cell 200, increasing the contact area between them and thereby increasing the support stability of the composite solder ribbon 100 and the solar cell 200. Simultaneously, the support segment 123 of the insulating tape 12 extends to the surface of the solar cell 200, which also helps to further electrically isolate the first solder ribbon 11 and the second solder ribbon 13.

[0061] Furthermore, the support segment 123 of the insulating tape 12 can be integrally formed with the first insulating element 112 and the second insulating element 132. For example, during the production process, the support segment 123, the first insulating element 112, and the second insulating element 132 can be integrally formed, and then the first welding strip 11 and the second welding strip 13 can be fixed in their respective positions. In this way, the production process of the composite welding strip 100 can be simplified and the integrity of the composite welding strip 100 can be enhanced.

[0062] exist Figure 7 In the example, the core of the first welding strip 11 has an irregular cross-section with at least one bend, and the second welding strip 13 is symmetrically arranged on both sides of the insulating strip 12 with the first welding strip 11. The insulating strip 12 is inverted T-shaped. Both the first welding strip 11 and the second welding strip 13 include a core, and the cross-section of the core includes three rectangles arranged sequentially and at an angle to each other.

[0063] Thus, the core has an irregularly shaped cross-section with bends. With the cross-sectional area of ​​the solder strip and the contact area between the solder strip and the cell surface (such as pads, PADs, etc.) remaining constant, the solder strip can maintain the same or similar conductivity. In this case, the solder strip of the core with the irregular cross-section is typically narrower, thereby reducing light loss to the cell. Additionally, the T-shaped insulating tape 12 can also be used to fill the gap between the composite solder strip 100 and the surface of the cell 200, providing support for the composite solder strip 100.

[0064] Please see Figure 4 or Figure 8 The battery string 1000 of this application embodiment includes a plurality of battery cells 200 and a composite solder strip 100 of any of the above. The battery cell 200 includes a first polarity grid line and a second polarity grid line. The first solder strip 11 of the composite solder strip 100 is connected to the first polarity grid line, and the second solder strip 13 of the composite solder strip 100 is connected to the second polarity grid line. Thus, the composite solder ribbon 100, integrating the first solder ribbon 11 and the second solder ribbon 13, requires half the frequency of arrangement when connecting to the solar cell 100 compared to a conventional single solder ribbon. Simultaneously, because the first insulating member 112 electrically separates adjacent first battery connection areas 113, the second insulating member 132 electrically separates adjacent second battery connection areas 133, and the insulating strip 12 electrically separates the first solder ribbon 11 and the second solder ribbon 13, the operation of insulating the composite solder ribbon 100 to each non-corresponding grid line can be omitted when connecting it to the solar cell 200. This simplifies the connection steps between the solder ribbon and the solar cell.

[0065] The battery assembly in this application embodiment includes the battery string 1000 described above.

[0066] In this embodiment, multiple battery cells 200 in the battery assembly can be connected in series to form a battery string 1000, thereby achieving series current collection and output. For example, the battery cells 200 can be connected in series by setting solder strips (busbars, interconnecting strips), conductive backplates, etc. In some other embodiments, the battery cells 200 can also be connected in parallel to form a string using composite solder strips 100. No limitation is made here.

[0067] It is understood that in such embodiments, the battery assembly may also 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, and adjacent cells. 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.

[0068] Photovoltaic glass can be applied to the encapsulating film on the front of solar cells. This photovoltaic glass can be ultra-clear glass, characterized by 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.

[0069] The backsheet can be attached to the encapsulating 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, and aluminum alloy TPT composite encapsulating film, etc., depending on the specific circumstances and not limited here. The backsheet, solar cell, encapsulating 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, providing stable support and installation. For example, the battery module can be installed at the desired location using the metal frame.

[0070] The beneficial effects of the battery assembly in this embodiment are equivalent to those of the battery string 1000 described above, and will not be repeated here.

[0071] The photovoltaic system of this application embodiment includes the battery module described above.

[0072] 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 to generate electricity. 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; for example, multiple battery modules 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.

[0073] The beneficial effects of the photovoltaic system in this embodiment are equivalent to the beneficial effects of the battery module described above, and will not be repeated here.

[0074] 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.

[0075] 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 composite welding strip, characterized in that, It includes a first solder strip, an insulating strip, and a second solder strip, wherein the first solder strip, the insulating strip, and the second solder strip extend along a first direction and are arranged in contact with each other along a second direction; The first solder strip includes a first conductive element and a plurality of first insulating elements. The first insulating elements are disposed on the first conductive element and are distributed at intervals along the first direction. The first conductive elements are exposed between two adjacent first insulating elements to form a first battery connection area.

2. The composite welding strip according to claim 1, characterized in that, The second solder strip includes a second conductive element and a plurality of second insulating elements. The second insulating elements are disposed on the second conductive element and are spaced apart along the first direction. The second conductive elements are exposed between two adjacent second insulating elements to form a second battery connection area.

3. The composite welding strip according to claim 2, characterized in that, The second insulating element and the first insulating element are arranged alternately along the first direction, and the first battery connection area and the second battery connection area are arranged alternately.

4. The composite welding strip according to claim 1, characterized in that, The insulating tape includes a body segment located between the first solder strip and the second solder strip, electrically isolating the first solder strip and the second solder strip.

5. The composite welding strip according to claim 1, characterized in that, The second solder strip partially overlaps with the first solder strip along the second direction.

6. The composite welding strip according to claim 4, characterized in that, The insulating tape includes an extension section that extends outward from the body section.

7. The composite welding strip according to claim 6, characterized in that, The insulating strip includes a support section located between the body section and the battery cell.

8. A battery string, characterized in that, The device includes a plurality of battery cells and a composite solder strip according to any one of claims 1-7. The battery cells include a first polar grid line and a second polar grid line. The first solder strip of the composite solder strip is connected to the first polar grid line, and the second solder strip of the composite solder strip is connected to the second polar grid line.

9. A battery assembly, characterized in that, Includes the battery string as described in claim 8.

10. A photovoltaic system, characterized in that, Includes the battery assembly as described in claim 9.

Images