Intermediate bus bar for battery assembly, battery assembly and photovoltaic system

Abstract

The utility model relates to the technical field of solar cells, and provides an intermediate bus bar for a battery assembly, the battery assembly and a photovoltaic system, and a first end of a body part of the intermediate bus bar is connected with a first lead part which is bent towards a first side relative to the body part; the second lead part is bent relative to the first lead part so as to be stacked on the side, away from the body part, of the first lead part. One side of the second lead part is also provided with an extension part. Therefore, through the arrangement of the first lead part, the second lead part and the extension part, a lead structure formed by the first lead part and the second lead part cannot be located at the outermost edge of the middle bus bar, so that the risk of short circuit caused by lap joint of the lead structure and an adjacent circuit is reduced; and meanwhile, the edge end position of the middle bus bar is prevented from tilting in the manufacturing process, so that the welding reliability of the welding strip at the edge position and the middle bus bar is ensured.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, and more particularly to an intermediate busbar for a cell module, a cell module, and a photovoltaic system. Background Technology

[0002] Solar cells, also known as photovoltaic cells, are devices that directly convert light energy into direct current using the photovoltaic effect. In related technologies, multiple solar cells are connected in series, laminated, and encapsulated to form a solar module. A solar module consists of multiple cell strings, and a central busbar is typically located in the middle of the module. This busbar is used to weld the solder strips of the cell strings on either side to connect the two strings in parallel. The central busbar connects to a junction box.

[0003] In related technologies, such as Figure 1 As shown, in order to draw the current from the parallel battery string, the end of the intermediate busbar 310 is bent to form a lead-out portion 311 for insertion into the junction box 300 on the back plate. However, in this technical solution, the lead-out portion 311 is formed by bending one end of the intermediate busbar 300. The lead-out portion 311 is located at the edge of the intermediate busbar 310, which easily leads to overlap between the lead-out portion 311 and adjacent lines (such as opposite polarity solder strips on adjacent battery strings) due to the small distance between them, causing a short circuit. At the same time, during the manufacturing process, since the lead-out portion 310 is formed by bending the end of the intermediate busbar 310, during the lamination process, in order to facilitate lamination, the lead-out portion 310 needs to be pressed down onto the back plate first. During the pressing process, the bending position of the intermediate busbar 310 is prone to warping, which can easily lead to poor soldering between the solder strip at the edge and the intermediate busbar, resulting in poor welding reliability. Utility Model Content

[0004] This application provides an intermediate busbar for a battery module, a battery module, and a photovoltaic system.

[0005] This application is implemented as follows: the intermediate busbar in the embodiments of this application includes:

[0006] The body portion has opposing first and second sides in the thickness direction, and opposing first and second ends in the length direction;

[0007] A first lead portion is connected to the first end and bent toward the first side relative to the body portion;

[0008] a second lead portion connected to an end of the first lead portion and bent relative to the first lead portion to be stacked on a side of the first lead portion facing away from the body portion, the second lead portion and the first lead portion together forming a lead structure for connection with a terminal box of a battery assembly; and

[0009] an extension connected to an end of the second lead portion, the extension being bent relative to the second lead portion toward a side facing away from the body portion and parallel to the body portion.

[0010] In some embodiments, a surface of the body portion facing the first side is flush with a surface of the extension facing the first side, and a surface of the body portion facing the second side is flush with a surface of the extension facing the second side; or

[0011] a height difference between a surface of the body portion facing the first side and a surface of the extension facing the side is less than 3.5 mm, and a height difference between a surface of the body portion facing the second side and a surface of the extension facing the second side is less than 3.5 mm.

[0012] In some embodiments, the first lead portion has the same shape as the second lead portion.

[0013] In some embodiments, the first lead portion and the second lead portion are completely coincident. In some embodiments, the extension has a length of 0.5 mm to 2 mm.

[0014] In some embodiments, the first lead portion and the second lead portion have a width smaller than a width of the body portion.

[0015] In some embodiments, the body portion has a width of 10 mm to 15 mm, and the first lead portion and the second lead portion have a width of less than 12 mm.

[0016] In some embodiments, the first lead portion and the second lead portion have a width of less than 10 mm.

[0017] In some embodiments, the first lead portion and the second lead portion have a length of 15 mm to 35 mm.

[0018] In some embodiments, the first lead portion and the second lead portion have a length of 20 mm to 25 mm.

[0019] In some embodiments, the first lead portion and the second lead portion have the same structure and are stacked in register, the first lead portion includes a first portion and a second portion, the first portion is connected with the body portion, the second portion is connected with the first portion, the width of the first portion is the same as the width of the body portion, the width of the second portion is smaller than the width of the first portion and the body portion, and the second portion is used to connect with a junction box of a battery assembly.

[0020] In some embodiments, the width of the second portion is less than 10 mm; and / or

[0021] The length of the second portion is 12 mm-23 mm.

[0022] The present application also provides a battery assembly, which comprises:

[0023] Parallel battery string units, the parallel battery string units include a first battery string and a second battery string arranged along a first direction, the first battery string and the second battery string each include a plurality of battery pieces connected in series along the first direction;

[0024] The intermediate busbar of any one of the above, the intermediate busbar is used to connect the first battery string and the second battery string in parallel; and

[0025] A junction box, the lead structure is inserted into the junction box and electrically connected with the junction box.

[0026] The present application also provides a photovoltaic system, which includes the above-mentioned battery assembly.

[0027] In the intermediate busbar, the battery assembly and the photovoltaic system provided in the embodiments of the present application, the first end of the body part of the intermediate busbar is connected with the first lead part which is bent towards the first side relative to the body part, the second lead part is connected with the end of the first lead part and is bent relative to the first lead part to be stacked on the side of the first lead part away from the body part, and the second lead part and the first lead part jointly constitute a lead structure. Meanwhile, one side of the second lead part further has an extension part. In this way, on the one hand, the lead structure constituted by the first lead part and the second lead part will not be located at the edge of the intermediate busbar, so as to reduce the risk of short circuit caused by the lapping of the lead structure and the adjacent line (for example, the heteropolarity solder strip). On the other hand, due to the existence of the extension part, the position of the first lead part bent relative to the body part and the distance of the second lead part bent relative to the extension part from the edge of the intermediate busbar have a certain distance. Even if the lead structure needs to be first passed through the through hole on the back plate and bent and pressed on the back plate in the lamination process, due to the existence of the extension part, the force generated by the bent lead structure can be offset by the body part and the extension part, so as to avoid the edge end position of the intermediate busbar from being warped, thereby ensuring the welding reliability of the solder strip and the intermediate busbar at the edge position.

[0028] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a connection structure between the junction box and the intermediate busbar in the battery assembly in the related art;

[0030] Figure 2 is a module schematic diagram of the photovoltaic system provided in the embodiments of the present application;

[0031] Figure 3 is a planar schematic diagram of the battery assembly provided in the embodiments of the present application;

[0032] Figure 4 is Figure 3 is an enlarged schematic diagram of the battery assembly in at IV;

[0033] Figure 5 is a front view of the intermediate busbar provided in the embodiments of the present application;

[0034] Figure 6 is a top view of the intermediate busbar provided in the embodiments of the present application;

[0035] Figure 7 is a left view of the intermediate busbar provided in the embodiments of the present application;

[0036] Figure 8is another left view of the intermediate busbar provided by the embodiment of the present application.

[0037] Main element symbol explanation:

[0038] Photovoltaic system 1000, battery assembly 100, parallel battery string unit 10, first battery string 11, second battery string 12, battery piece 101, intermediate busbar 20, body part 21, first lead part 22, second lead part 23, extension part 24, junction box 30, first edge busbar 40, second edge busbar 50. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0040] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "lateral", "longitudinal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless specifically defined and limited otherwise, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0044] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the components and arrangements of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0045] Please refer to Figure 2 and Figure 3 The photovoltaic system 1000 in the embodiments of the present application can include the battery assembly 100 in the embodiments of the present application, and the battery assembly 100 in the embodiments of the present application can include a plurality of battery pieces 101. The battery piece 101 can be a back contact solar cell piece, or a Topcon solar cell piece, etc., and the specific type is not limited here.

[0046] In the embodiments of the present application, a plurality of battery pieces 101 in the battery assembly 100 can be connected in series to form a plurality of battery strings. Each battery string can be connected in series and parallel combination to realize the current bus output. For example, the connection between each battery piece 101 can be realized by welding the welding strip, and the series and parallel connection between each battery string can be realized by the intermediate bus bar 20, the first edge bus bar 40 and the second edge bus bar 50 described below. Each battery string can form an array of battery pieces 101, and then be packaged together by the front plate, the front adhesive film, the rear adhesive film and the back plate to form the battery assembly 100.

[0047] Please refer to Figure 3 The battery assembly 100 includes a plurality of battery strings, and each battery string includes a plurality of battery pieces 101 connected in series along a first direction. As shown in Figure 3As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction.

[0048] As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction. Figure 3 and Figure 4 As shown in FIG. 1, the battery assembly 100 further includes an intermediate busbar 20 and a junction box 30 in the embodiments of the present application, the intermediate busbar 20 is used to connect the first battery string 11 and the second battery string 12 in parallel, that is, the first battery string 11 and the second battery string 12 are both connected to the intermediate busbar 20, and the first battery string 11 and the second battery string 12 have the same polarity. The junction box 30 is arranged on the back plate of the battery assembly 100, and the bypass diode is arranged in the junction box 30.

[0049] As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction. Figure 3 As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction.

[0050] As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction. Figure 3 As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction. Figure 3 As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction. Figure 3 As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction. Figure 4 As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction. Figure 4 As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction.

[0051] As shown in FIG. 1, the battery assembly 100 can include a plurality of parallel battery string units 10, and each parallel battery string unit 10 includes a first battery string 11 and a second battery string 12 arranged along a first direction, and each of the first battery string 11 and the second battery string 12 includes a plurality of battery pieces 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 can be symmetric about a center line of the battery assembly 100 in the first direction.Figure 5 The intermediate busbar 20 in the embodiments of the present application can include a body portion 21, a first lead portion 22, a second lead portion 23 and an extension portion 24. The body portion 21 has opposite first and second sides in the thickness direction, and has opposite first and second ends 211 and 212 in the length direction.

[0052] The first lead portion 22 is connected at the first end 211 and is bent towards the first side relative to the body portion 21. The second lead portion 23 is connected at the end of the first lead portion 22 and is bent relative to the first lead portion 22 to be stacked on the side of the first lead portion 22 away from the body portion 21, and the second lead portion 23 and the first lead portion 22 together form a lead structure. The extension portion 24 is connected at the end of the second lead portion 23, and is bent towards the side away from the body portion 21 relative to the second lead portion 23 and parallel to the body portion 21. It should be noted that in the embodiments of the present application, "parallel" means that the two are completely parallel or the angle between the two is approximately parallel within the process manufacturing error range.

[0053] The lead structure is used to connect with the junction box 30 of the battery assembly 100, specifically, the lead structure formed by the first lead portion 22 and the second lead portion 23 is inserted into the junction box 30 through the back plate of the battery assembly 100 to connect with the positive or negative connection terminal of the junction box 30.

[0054] In the parallel battery string unit 10, the first battery string 11 and the second battery string 12 are both connected with the body portion 21 at least to realize the parallel connection of the two. Specifically, the first battery string 11 and the second battery string 12 both have a plurality of welding strips thereon, and both can be welded with the body portion 21 through the welding strips. It can be understood that in some embodiments, in the first battery string 11 and the second battery string 12, the welding strips located at the edge position can also be welded with the extension portion 24, which is not specifically limited here.

[0055] In the middle busbar 20, the battery assembly 100 and the photovoltaic system 1000 of the embodiments of the present application, the first end 211 of the body part 21 of the middle busbar 20 is connected with the first lead part 22 which is bent towards the first side relative to the body part 21, the second lead part 23 is connected with the end of the first lead part 22 and is bent relative to the first lead part 22 to be stacked on the side of the first lead part 22 away from the body part 21, and the second lead part 23 and the first lead part 22 together constitute a lead structure. Meanwhile, the second lead part 23 also has an extension part 24 on one side. In this way, on the one hand, through the arrangement of the first lead part 22, the second lead part 23 and the extension part 24, the lead structure constituted by the first lead part 22 and the second lead part 23 will not be located at the edge of the middle busbar 20, thereby reducing the risk of short circuit caused by the lapping of the lead structure and the adjacent line (for example, the heteropolarity solder strip). On the other hand, through such special structural design, due to the presence of the extension part 24, the position of the first lead part 22 bent relative to the body part 21 and the distance between the second lead part 23 bent relative to the extension part 24 and the edge of the middle busbar 20 have a certain distance, even if the lead structure needs to be first passed through the through hole on the back plate and bent and pressed on the back plate during the lamination process, due to the presence of the extension part 24, the force generated by the bent lead structure can be offset by the body part 21 and the extension part 24, avoiding the edge end position of the middle busbar 20 from being warped, thereby ensuring the welding reliability of the solder strip at the edge position and the middle busbar 20.

[0056] Specifically, the middle busbar 20 is of metal material, for example, aluminum strip, copper strip, tin strip, etc., which is not specifically limited here. In some embodiments, the middle busbar 20 can be of an integrated structure, which can have a continuous and flat metal strip formed by multiple bending and stacking, for example, the metal strip can be first bent once to obtain the body part 21 and the first bent part, then the first bent part is bent twice to obtain the first lead part 22 and the second bent part, and finally the second bent part is bent three times to obtain the second lead part 23 and the extension part 24, and then the first lead part 22 and the second lead part 23 can be pressed together by pressing process to form the lead structure. It can be understood that in the present application, the first lead part 22 and the second lead part 23 are only stacked together without being fixed and welded, and under the action of external force, the first lead part 22 and the second lead part 23 can be separated.

[0057] In the embodiments of the present application, the first lead part 22 and the second lead part 23 can be arranged perpendicular to the body part 21.

[0058] Please refer to Figure 4As shown above, in the middle busbar 20 of the battery assembly 100, the short busbar only connects with one polarity of one terminal of the terminal box 30. Therefore, in the short busbar, the first lead part 22, the second lead part 23 and the extension part 24 can only be arranged at the first end 211 of the body part 21.

[0059] As shown above, in the middle busbar 20 of the battery assembly 100, the short busbar only connects with one polarity of one terminal of the terminal box 30. Therefore, in the short busbar, the first lead part 22, the second lead part 23 and the extension part 24 can only be arranged at the first end 211 of the body part 21. Figure 4 As shown above, in the middle busbar 20 of the battery assembly 100, the short busbar only connects with one polarity of one terminal of the terminal box 30. Therefore, in the short busbar, the first lead part 22, the second lead part 23 and the extension part 24 can only be arranged at the first end 211 of the body part 21.

[0060] As shown above, in the middle busbar 20 of the battery assembly 100, the short busbar only connects with one polarity of one terminal of the terminal box 30. Therefore, in the short busbar, the first lead part 22, the second lead part 23 and the extension part 24 can only be arranged at the first end 211 of the body part 21. Figure 5 In some embodiments, the surface of the body part 21 facing the first side is flush with the surface of the extension part 24 facing the first side, and the surface of the body part 21 facing the second side is flush with the surface of the extension part 24 facing the second side.

[0061] In this way, the two surfaces of the body part 21 and the extension part 24 in the thickness direction are flush, which can ensure that the part of the middle busbar 20 welded with the solder strip is in the same plane, ensure the consistency and reliability of the solder strip and the middle busbar 20, and avoid causing partial soldering of the solder strip.

[0062] Of course, in other embodiments, the height difference between the surface of the body part 21 facing the first side and the surface of the extension part 24 facing the first side is less than 3.5 mm, for example, the height difference between the two can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc. The height difference between the surface of the body part 21 facing the second side and the surface of the extension part 24 facing the second side is less than 3.5 mm, for example, the height difference between the two can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc.

[0063] In this way, although the surfaces of the body part 21 and the extension part 24 are not flush, the height difference between them is less than 3.5 mm, and the height difference between them is small enough, which can effectively ensure the reliability of the welding.

[0064] As shown above, in the middle busbar 20 of the battery assembly 100, the short busbar only connects with one polarity of one terminal of the terminal box 30. Therefore, in the short busbar, the first lead part 22, the second lead part 23 and the extension part 24 can only be arranged at the first end 211 of the body part 21. Figures 5-7 In some embodiments, the shape of the first lead part 22 is the same as that of the second lead part 23. In this way, the manufacturing is simple and convenient.

[0065] In some embodiments, the first lead portion 22 is fully coincident with the second lead portion 23. In this way, the shape of the lead structure can be guaranteed to be consistent and coincident at various positions, the structure of the lead structure is simplified, and the stability of the connection with the terminal box 30 is improved.

[0066] Referring to Figure 5 In some embodiments, the length L1 of the extension portion 24 is 0.5 mm-2 mm. In this way, by setting the length L1 of the extension portion 24 within this reasonable range, it can be avoided that the length L1 of the extension portion 24 is too large to cause the extension portion 24 to be short-circuited by being overlapped with the adjacent line, and it can also be avoided that the length L1 of the extension portion 24 is too small to cause the solder ribbon located at the edge to fail to form stable contact with the extension portion 24.

[0067] Specifically, in such embodiments, the length L1 of the extension portion 24 may, for example, be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, or any value between 0.5 mm and 2 mm, which is not particularly limited herein.

[0068] Referring to Figure 6 and Figure 7 In some embodiments, the width D1 of the first lead portion 22 and the second lead portion 23 is less than the width D2 of the body portion 21, i.e., D1

[0069] In this way, by setting the width of the first lead portion 22 and the second lead portion 23 to be small, it can be facilitated that the lead structure is inserted into the connection terminal of the terminal box 30.

[0070] Further, in some embodiments, the width D2 of the body portion 21 can be 10 mm-15 mm, and the width D1 of the first lead portion 22 and the second lead portion 23 is less than 12 mm.

[0071] In this way, by setting the width of the body portion 21 to be within the range of 10 mm-15 mm, the soldering stability of the solder ribbon and the body portion 21 can be guaranteed while the busbar transmission loss and cost are controlled. By setting the width of the first lead portion 22 and the second lead portion 23 to be less than 12 mm, it can be facilitated that the lead structure is inserted into the connection terminal of the terminal box 30.

[0072] In some embodiments, the width D1 of the first lead portion 22 and the second lead portion 23 is preferably less than 10 mm.

[0073] In this way, it can be avoided that the width of the first lead portion 22 and the second lead portion 23 is too large to increase the difficulty of being inserted into the connection terminal of the terminal box 30, i.e., in this way, it can be facilitated that the lead structure composed of the first lead portion 22 and the second lead portion 23 is inserted into the connection terminal of the terminal box 30.

[0074] In some embodiments, the length L2 of the first lead portion 22 and the second lead portion 23 is 15-35 mm. In some preferred embodiments, the length L2 of the first lead portion 22 and the second lead portion 23 is preferably 20-25 mm.

[0075] In this way, the length of the first lead portion 22 and the second lead portion 23 can be prevented from being too short, so that the length of the portion of the lead structure inserted into the junction box 30 is not too short, and the connection stability between the portion of the lead structure inserted into the junction box 30 and the connection terminal of the junction box 30 can be improved.

[0076] Specifically, in such embodiments, the length L2 of the first lead portion 22 and the second lead portion 23 can be, for example, 15 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, 32 mm, 34 mm, 35 mm, or any value between 15 mm and 35 mm. Preferably, the length L2 of the first lead portion 22 and the second lead portion 23 is 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, or any value between 20 mm and 25 mm.

[0077] Please refer to Figure 5 and Figure 8 In some embodiments, the first lead portion 22 and the second lead portion 23 have the same structure and are stacked and coincident, the first lead portion 22 includes a first portion 221 and a second portion 222, the first portion 221 is connected to the body portion 21, the second portion 222 is connected to the first portion 221, the width D3 of the first portion 221 is the same as the width D2 of the body portion 21, i.e., D3=D2. The width D4 of the second portion 222 is smaller than the width D3 of the first portion 221 and the width D2 of the body portion 21, i.e., D4

[0078] In this way, the width of the body portion 21 and the first portion 221 is set to be wide, and the width of the second portion 222 is set to be narrow. The second portion 222 can be inserted into the junction box 30 through the connection with the connection terminal of the junction box 30, which can facilitate the insertion of the second portion 222 into the junction box 30 and save material costs. The first portion 221 is set to be wide, which can reduce transmission loss.

[0079] In some embodiments, the width D4 of the second portion 222 is less than 10 mm, preferably less than 9.6 mm. In this way, it can be ensured that the second portion 222 can be simply and smoothly inserted into the junction box 30, and the difficulty of inserting the second portion 222 into the junction box 30 can be reduced due to the width of the second portion 222 being too wide.

[0080] In some embodiments, the length L3 of the second portion 222 is 12mm-23mm. In this way, the length of the second portion 222 can be avoided to be too short to cause the length of the second portion 222 protruding from the back plate to be too short to cause the portion of the second portion 222 for insertion into the junction box 30 to be too short to cause unstable connection, and the length of the second portion 222 can be avoided to be too large to cause cost increase.

[0081] In particular, in such embodiments, the overall length of the first lead portion 22 and the second lead portion 23 can be 15mm-35mm, preferably 20mm-25mm. The length of the second portion 222 is preferably 12mm-23mm, and the length of the second portion 222 can be, for example, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, or any value between 12mm and 23mm.

[0082] In the description of the specification, the description of the terms "some embodiments", "exemplary embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0083] In addition, the above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An intermediate busbar for a battery assembly, characterized by, Comprising: a body portion having opposite first and second sides in a thickness direction and having opposite first and second ends in a length direction; a first lead portion connected at the first end and bent towards the first side relative to the body portion; a second lead portion connected to an end of the first lead portion and bent relative to the first lead portion to stack on a side of the first lead portion facing away from the body portion, the second lead portion and the first lead portion together forming a lead structure for connecting with a junction box of a battery assembly; and an extension portion connected to an end of the second lead portion, the extension portion bent towards a side of the second lead portion facing away from the body portion and parallel to the body portion.

2. The intermediate busbar for a battery assembly of claim 1, wherein, a surface of the body portion facing the first side is flush with a surface of the extension portion facing the first side, and a surface of the body portion facing the second side is flush with a surface of the extension portion facing the second side; or a height difference between the surface of the body portion facing the first side and the surface of the extension portion facing the first side is less than 3.5 mm, and a height difference between the surface of the body portion facing the second side and the surface of the extension portion facing the second side is less than 3.5 mm.

3. The intermediate busbar for a battery assembly of claim 1, wherein, the first lead portion has the same shape as the second lead portion.

4. The intermediate busbar for a battery assembly of claim 1, wherein, the first lead portion is fully coincident with the second lead portion.

5. The intermediate busbar for a battery assembly of claim 1, wherein, the extension portion has a length of 0.5 mm to 2 mm.

6. The intermediate busbar for a battery assembly of claim 1, wherein, the first lead portion and the second lead portion have a width less than a width of the body portion.

7. The intermediate busbar for a battery assembly of claim 6, wherein, the body portion has a width of 10 mm to 15 mm, and the first lead portion and the second lead portion have a width less than 12 mm.

8. The intermediate busbar for a battery assembly of claim 7, wherein, the first lead portion and the second lead portion have a width less than 10 mm.

9. The intermediate busbar for a battery assembly of claim 1, wherein, the first lead portion and the second lead portion have a length of 15 mm to 35 mm.

10. The intermediate busbar for a battery assembly of claim 9, wherein, the first lead portion and the second lead portion have a length of 20 mm to 25 mm.

11. The intermediate busbar for a battery assembly of claim 1, wherein, the first lead portion and the second lead portion have the same structure and are stacked coincident, the first lead portion includes a first portion connected with the body portion and a second portion connected with the first portion, the first portion has the same width as the body portion, the second portion has a width less than the width of the first portion and the body portion, and the second portion is for connecting with a junction box of a battery assembly.

12. The intermediate busbar for a battery assembly of claim 11, wherein, the second portion has a width less than 10 mm; and / or the second portion has a length of 12 mm to 23 mm.

13. A battery assembly characterized by, Comprising: parallel battery string units including first and second battery strings arranged along a first direction, each of the first and second battery strings including a plurality of battery cells arranged in series along the first direction; the intermediate busbar of any one of claims 1-12 for connecting the first and second battery strings in parallel; and a junction box into which the lead structure is inserted to electrically connect with the junction box.

14. A photovoltaic system characterized by, The battery assembly of claim 13.

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