Busbar, assembly and system

Abstract

The present disclosure provides a busbar, an assembly and a system. A groove is provided at the position on a busbar body of an intermediate busbar close to a first edge, and a lead portion is connected to the side wall of the groove close to the first edge. The risk of short circuits caused by the overlapping of the lead portion with an adjacent circuit can be reduced, and the welding reliability between a solder ribbon at an edge position and the intermediate busbar can also be ensured.

Description

Busbars, components and systems

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 202520153432X, filed on January 22, 2025, entitled "Intermediate Busbar, Battery Module and Photovoltaic System", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of solar cell technology, and more particularly to an intermediate busbar, a cell module, and a photovoltaic system. Background Technology

[0004] 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.

[0005] In related technologies, as shown in Figure 1, to draw the current from a 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 backplate. However, in this technical solution, the lead-out portion 311 is formed by bending one end of the intermediate busbar 300. Located at the edge of the intermediate busbar 310, the lead-out portion 311 is prone to overlap with adjacent lines (e.g., opposite polarity solder strips on adjacent battery strings) due to insufficient distance, causing a short circuit. Furthermore, during manufacturing, since the lead-out portion 310 is formed by bending the end of the intermediate busbar 310, it needs to be pressed down onto the backplate during lamination to facilitate lamination. During this pressing process, the bent portion of the intermediate busbar 310 is prone to warping, easily leading to incomplete soldering between the solder strips at the edge and the intermediate busbar, resulting in poor welding reliability.

[0006] Utility Model Content

[0007] This disclosure provides an intermediate busbar, a battery module, and a photovoltaic system.

[0008] This disclosure is implemented as follows: the intermediate busbar in the embodiments of this disclosure includes:

[0009] The intermediate busbar includes:

[0010] A manifold body having a first side and a second side opposite each other in the thickness direction, and a first edge and a second edge opposite each other in the length direction, with a groove at a position near the first edge of the manifold body;

[0011] The lead portion is connected to the sidewall of the groove near the first edge, and the lead portion is bent toward the first side relative to the body portion. The shape of the lead portion matches that of the groove. The bus body includes an extension located between the lead portion and the first edge. The lead portion is used to connect to the junction box of the battery assembly.

[0012] In some embodiments, the length of the extension is 0.5mm-20mm.

[0013] In some embodiments, the length of the extension is 0.5mm-2.5mm.

[0014] In some embodiments, the width of the lead portion is less than 10 mm.

[0015] In some embodiments, the length of the lead portion is 20mm-25mm.

[0016] In some embodiments, the lead portion includes a first portion and a second portion, the first portion being connected to the sidewall of the groove facing the first edge, the second portion being connected to the first portion, the width of the second portion being smaller than the width of the first portion, and the second portion being used for connection to the junction box of the battery assembly.

[0017] In some embodiments, the second portion satisfies at least one of the following:

[0018] The width of the second part is less than 10mm;

[0019] The length of the second part is 12mm-18mm.

[0020] In some embodiments, the intermediate busbar further includes a folded portion connected to the first edge, the folded portion being bent toward the second side relative to the busbar body and stacked on the second side of the busbar body, the folded portion obscuring at least a portion of the groove.

[0021] This disclosure also provides a battery assembly, the battery assembly comprising:

[0022] A parallel battery string unit, the parallel battery string unit includes a first battery string and a second battery string arranged along a first direction, and both the first battery string and the second battery string include a plurality of battery cells connected in series along the first direction;

[0023] The intermediate busbar described in any of the above claims is used to connect the first battery string and the second battery string in parallel.

[0024] A junction box, wherein the lead wire is inserted into the junction box and electrically connected to the junction box.

[0025] This disclosure also provides a photovoltaic system comprising the aforementioned battery module.

[0026] In the intermediate busbar, battery module, and photovoltaic system of this disclosure, a groove is formed on the busbar body near the first edge. A lead portion bent towards the first side relative to the busbar body is connected to the sidewall of the groove near the first edge. The busbar body includes an extension portion located between the lead portion and the first edge. Thus, by forming a groove on the busbar body, having a lead portion on the sidewall of the groove, and having a predetermined length for the portion of the busbar body between the lead portion and the first edge, the lead portion is prevented from being located at the very edge of the intermediate busbar, thereby reducing the risk of short circuits caused by the lead portion overlapping with adjacent lines (e.g., opposite polarity solder strips). Meanwhile, through this special structural design, because the bending position of the lead portion relative to the bus body is a certain distance from the edge of the intermediate busbar, even if the lead portion needs to be passed through the groove on the back plate and bent and pressed onto the back plate during the lamination process, the force generated by bending the lead portion can be offset by the portion of the bus body located on both sides of the lead portion. This prevents the edge of the intermediate busbar from lifting, thus ensuring the welding reliability of the solder strip at the edge position to the intermediate busbar. Furthermore, the shape of the lead portion matches the groove, allowing the groove and lead portion to be formed directly by cutting on the busbar and bending the cut portion towards the first side, which simplifies the manufacturing process and saves materials.

[0027] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the connection structure between the junction box and the intermediate busbar in a battery assembly in the related technology;

[0029] Figure 2 is a schematic diagram of the photovoltaic system provided in an embodiment of this disclosure;

[0030] Figure 3 is a plan view of the battery assembly provided in an embodiment of this disclosure;

[0031] Figure 4 is an enlarged schematic diagram of the battery assembly in Figure 3 at point IV;

[0032] Figure 5 is a cross-sectional structural diagram of the intermediate busbar provided in an embodiment of this disclosure;

[0033] Figure 6 is another cross-sectional structural schematic diagram of the intermediate busbar provided in an embodiment of this disclosure;

[0034] Figure 7 is a top view of the intermediate busbar provided in an embodiment of this disclosure;

[0035] Figure 8 is a left view of the middle busbar in Figure 7;

[0036] Figure 9 is another top view of the intermediate busbar provided in an embodiment of this disclosure;

[0037] Figure 10 is a left view of the middle busbar in Figure 9;

[0038] Figure 11 is another cross-sectional structural schematic diagram of the intermediate busbar provided in the embodiment of this disclosure.

[0039] Explanation of key component symbols: Photovoltaic system 1000, battery module 100, parallel battery string unit 10, first battery string 11, second battery string 12, battery cell 101, intermediate busbar 20, busbar body 21, first edge 211, second edge 212, groove 210, extension 213, lead wire 22, folding part 23, junction box 30, first edge busbar 40, second edge busbar 50. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this disclosure 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 disclosure, and should not be construed as limiting this disclosure. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining this disclosure and are not intended to limit this disclosure.

[0041] In the description of this disclosure, it should be understood that the terms “length”, “width”, “upper”, “lower”, “lateral”, “longitudinal”, 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 disclosure 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 disclosure.

[0042] 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 disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" 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 disclosure according to the specific circumstances.

[0044] In this disclosure, 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 directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] The following disclosure provides numerous different embodiments or examples for implementing various structures of this disclosure. 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 disclosure. 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 disclosure, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0046] Please refer to Figures 2 and 3. The photovoltaic system 1000 in this embodiment may include the battery module 100 in this embodiment. The battery module 100 in this embodiment may include a plurality of battery cells 101. The battery cells 101 may be back-contact solar cells, Topcon solar cells, etc., and there are no specific limitations here.

[0047] In the embodiments of this disclosure, multiple battery cells 101 in the battery assembly 100 can be connected in series to form multiple battery strings. These battery strings can be combined in series and parallel to achieve current collection and output. For example, the connection between the individual battery cells 101 can be achieved by welding solder strips, and the series and parallel connections between the battery strings can be achieved through the intermediate busbar 20, the first edge busbar 40, and the second edge busbar 50 described below. The battery strings can form an array of battery cells 101, which are then encapsulated together by a front panel, a front adhesive film, a rear adhesive film, and a back panel to form the battery assembly 100.

[0048] Referring to Figure 3, the battery assembly 100 includes a plurality of battery strings, each battery string including a plurality of battery cells 101 connected in series along a first direction. As shown in Figure 3, the battery assembly 100 may include a plurality of parallel battery string units 10, each parallel battery string unit 10 including a first battery string 11 and a second battery string 12 arranged along the first direction, each of the first battery string 11 and the second battery string 12 including a plurality of battery cells 101 connected in series along the first direction. In some embodiments, the first battery string 11 and the second battery string 12 may be symmetrical about the centerline of the battery assembly 100 in the first direction.

[0049] As shown in Figures 3 and 4, the battery assembly 100 also includes an intermediate busbar 20 and a junction box 30 as described in this embodiment. The intermediate busbar 20 is used to connect the first battery string 11 and the second battery string 12 in parallel. That is, both the first battery string 11 and the second battery string 12 are connected to the intermediate busbar 20, and the polarities of the first battery string 11 and the second battery string 12 are the same. The junction box 30 is disposed on the back panel of the battery assembly 100, and a bypass diode is provided inside the junction box 30.

[0050] As shown in Figure 3, the battery assembly 100 may have multiple parallel battery string units 10, which are arranged along a second direction. The first direction may be the longitudinal direction of the battery assembly 100, and the second direction may be the transverse direction of the battery assembly 100. In the multiple parallel battery string units 10, adjacent first battery strings 11 are connected in series in pairs through a first edge busbar 40, and adjacent second battery strings 12 are connected in series in pairs through a second edge busbar 50.

[0051] Specifically, as shown in Figure 3, which illustrates a case where there are 6 parallel battery string units 10, as shown in Figures 3 and 4, there are 3 first edge busbars 40, 3 second edge busbars 50, 4 intermediate busbars 20, and 3 junction boxes 30. A junction box 30 is provided between each pair of adjacent intermediate busbars 20. In each pair of adjacent intermediate busbars 20, one intermediate busbar 20 is connected to the positive terminal of the junction box 30, and the other is connected to the negative terminal of the junction box 30. As shown in Figure 4, in the example shown in Figure 4, among the four intermediate busbars 20, the two intermediate busbars 20 located on both sides of the second direction are short busbars, and the two intermediate busbars 20 located in the middle are long busbars. The short busbars are connected to the positive or negative terminal of a junction box 30 at only one end, while the long busbars are connected to the positive terminal of a junction box 30 at one end and to the negative terminal of another junction box 30 at the other end.

[0052] Referring to Figure 5, the intermediate busbar 20 in this embodiment may include a busbar body 21 and a lead portion 22. The busbar body 21 has opposing first and second sides in the thickness direction, and opposing first edge 211 and second edge 212 in the length direction. As shown in Figures 5 and 6, a groove 210 is formed in the busbar body 21 near the first edge 211.

[0053] The lead portion 22 is connected to the sidewall of the recess 210 near the first edge 211, and the lead portion 22 is bent toward the first side relative to the busbar body 21. The shape of the lead portion 22 matches that of the recess 210, that is, when the lead portion 22 is bent toward the side where the second edge 212 is located until it is flush with the busbar body 21, the lead portion 22 fills the recess 210. The busbar body 21 includes an extension 213 located on the side where the lead portion 22 is located and the first edge 211 (i.e., the portion of the busbar body 21 located between the lead portion 22 and the first edge 211). The lead portion 22 is used to connect to the junction box 30 of the battery assembly 100.

[0054] Specifically, in the battery assembly 100, the lead wire 22 can pass through the back plate of the battery assembly 100 and be inserted into the junction box 30 to connect to the positive or negative terminal of the junction box 30.

[0055] In the parallel battery string unit 10, both the first battery string 11 and the second battery string 12 are connected in parallel with the bus body 21. Specifically, both the first battery string 11 and the second battery string 12 have several solder strips, and both can be soldered to the bus body 21 through the solder strips.

[0056] In the intermediate busbar 20, battery module 100, and photovoltaic system 1000 of this disclosure embodiment, a groove 210 is provided on the busbar body 21 of the intermediate busbar 20 near the first edge 211. A lead portion 22, bent toward the first side relative to the busbar body 21, is connected to the sidewall of the groove 210 near the first edge 211. The busbar body 21 includes an extension portion 213 located between the lead portion 22 and the first edge 211. Thus, by providing a groove 210 on the busbar body 21, having a lead portion 22 on the sidewall of the groove 210, and including an extension portion 213 located between the lead portion 22 and the first edge 211, the lead portion 22 is not located at the outermost edge of the intermediate busbar 20, thereby reducing the risk of short circuit caused by the lead portion overlapping with adjacent lines (e.g., opposite polarity solder strips). Meanwhile, through this special structural design, since the position where the lead portion 22 is bent relative to the bus body 21 is a certain distance from the edge of the intermediate busbar 20, even if the lead portion 22 needs to be passed through the groove on the back plate and bent and pressed onto the back plate during the lamination process, the force generated by bending the lead portion 22 can be offset by the portion of the bus body 21 located on both sides of the lead portion 22, preventing the edge end of the intermediate busbar 20 from lifting, thereby ensuring the welding reliability of the solder strip at the edge position and the intermediate busbar 20. Furthermore, the shape of the lead portion 22 matches the groove 210, and the groove 210 and lead portion 22 can be formed directly by cutting on the busbar and bending the cut part towards the first side, which simplifies the manufacturing process and saves materials.

[0057] Specifically, the intermediate busbar 20 is made of metal, such as aluminum, copper, or tin, and is not limited thereto. In some embodiments, the intermediate busbar 20 may be a one-piece structure, formed by cutting and bending a continuous and flat busbar. For example, the busbar may be first cut to obtain the three edges of the groove 210, so that a bendable suspended section is formed at the cut position. Then, the suspended section can be pressed towards the first side to bend it, thereby forming the groove 210 and the lead portion 22 on the busbar. In the embodiments of this disclosure, the lead portion 22 may be arranged perpendicular to the busbar body 21.

[0058] Referring to Figure 4, as shown above, in the intermediate busbar 20 of the battery assembly 100, the short busbar is connected to only one polarity of one of the junction boxes 30. Therefore, in the short busbar, the groove 210 and the lead portion 22 can only be located on the busbar body 21 near the first edge 211.

[0059] As shown in Figure 4, in the intermediate busbar 20 of the battery assembly 100, the long busbar needs to be connected to ports of different polarities in the two junction boxes 30. Therefore, in the long busbar, a groove 210 can be formed at the position of the busbar body 21 near the second edge 212, and another lead portion 22 can also be provided at the same time. The structure at the first edge 211 is symmetrical with the structure at the second edge 212, that is, the intermediate busbar 20 is symmetrical about the center line in the length direction. That is to say, in the embodiments of this disclosure, the intermediate busbar 20 may have a groove 210 and a lead portion 22 only at the first edge 211 of the busbar body 21, or it may have a groove 210 and a lead portion 22 at both the first edge 211 and the second edge 212.

[0060] Referring to Figure 5, in some embodiments, the groove 210 can completely penetrate the bus body 21 in the thickness direction. In this way, the lead portion 22 can have the same thickness as the bus body 210, thereby improving the current transmission capability of the lead portion 22.

[0061] Of course, as shown in Figure 6, in some embodiments, the groove 210 may not penetrate the busbar body 210; that is, the groove 210 can be regarded as a blind hole opened on the busbar body 210. In this way, it can effectively avoid the welding area between the solder strip at the location of the groove 210 and the intermediate busbar 20 being too small due to the hollowing out at the groove 210.

[0062] Referring to Figures 5 and 6, in some embodiments, the length L1 of the extension 213 (the portion of the bus body 21 located between the lead portion 22 and the first edge 211) is 0.5mm-20mm. By setting the length of the portion of the bus body 21 located between the lead portion 22 and the first edge 211 within this reasonable range, it is possible to avoid the portion being too long and overlapping with adjacent lines, causing a short circuit, and also to avoid the length L1 being too small, preventing the solder strip at the edge from forming a stable contact with this portion.

[0063] Specifically, in such an embodiment, the length L1 of the extension 213 is preferably 0.5mm-2mm. For example, its length can be any value between 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm or 0.5mm-2mm, and there is no specific limitation here.

[0064] Please refer to Figures 7 and 8. In some embodiments, the width D1 of the lead portion 22 is less than 12 mm.

[0065] Thus, by setting the width of the lead portion 22 to be relatively small, it is easier for the lead portion to be inserted into the connection terminal of the junction box 30. In some embodiments, the width D1 of the lead portion 22 is preferably less than 10 mm.

[0066] Furthermore, in some embodiments, the width D2 of the busbar body 21 may be 10mm-15mm.

[0067] Thus, the width of the bus body 21 is set in the range of 10mm-15mm, which can control the bus transmission loss and cost while ensuring the welding stability of the solder strip and the bus body 21.

[0068] In some embodiments, the length L2 of the lead portion 22 is 15mm-35mm. In some embodiments, the length of the lead portion 22 is preferably 20mm-25mm.

[0069] In this way, the length of the lead wire 22 can be avoided from being too short, which would result in the part of the lead wire inserted into the junction box 30 being too short, leading to poor connection stability between the lead wire and the connection terminal of the junction box 30.

[0070] Specifically, in such an embodiment, the length L2 of the lead portion 22 can be, for example, any value between 15mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, 35mm, or 15mm-35mm. Preferably, it is any value between 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, or 20mm-25mm.

[0071] Please refer to Figures 9 and 10. In some embodiments, the lead portion 22 includes a first portion 221 and a second portion 222. The first portion 221 is connected to the sidewall of the groove 210 facing the first edge 211. The second portion 222 is connected to the first portion 221. The width D4 of the second portion 222 is smaller than the width D3 of the first portion 221, that is, D4 < D3. The second portion 222 is used to connect to the junction box 30 of the battery assembly 100.

[0072] Thus, by setting the width of the first part 221 to be wider and the width of the second part 222 to be narrower, the connection between the narrower second part 222 and the connection terminal of the junction box 30 can facilitate the insertion of the second part 222 into the junction box 30, while also saving material costs. On the other hand, setting the width of the first part 221 to be wider can reduce transmission loss.

[0073] In some embodiments, the width D4 of the second portion 222 is less than 10 mm, preferably less than 9.6 mm. This ensures that the second portion 222 can be easily and smoothly inserted into the junction box 30, avoiding the difficulty of insertion into the junction box 30 due to the width of the second portion 222 being too wide.

[0074] In some embodiments, the length L3 of the second portion 222 is 12mm-18mm. This avoids the second portion 222 being too short, which would result in an insufficient length extending from the back panel and thus an insufficient length for insertion into the junction box 30, leading to unstable connections. It also avoids the second portion 222 being too long, which would increase costs.

[0075] Specifically, in such an embodiment, the overall length of the lead portion 22 can be 15mm-35mm, preferably 20mm-25mm. The length of the second portion 222 is preferably 12mm-18mm.

[0076] Referring to Figure 11, in some embodiments, the intermediate busbar 20 may also include a folded portion 23 connected to the first edge 211. The folded portion 23 is bent toward the second side relative to the busbar body 21 and stacked on the second side of the busbar body 21. The folded portion 23 covers at least a portion of the groove 210.

[0077] Thus, when the groove 210 completely penetrates the busbar body 21, the folding part 23 allows the intermediate busbar 20 to also have a part that can be used for welding at the position of the groove 210, thus avoiding poor welding at the position of the groove 210 during the welding process.

[0078] Specifically, as shown in FIG11, in such an embodiment, the folded portion 23 can just completely cover the groove 210.

[0079] In the description of this specification, 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 the described embodiment or example is included in at least one embodiment or example of this disclosure. 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.

[0080] Furthermore, the above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. An intermediate busbar for a battery assembly, wherein, The intermediate busbar includes: A manifold body having a first side and a second side opposite each other in the thickness direction, and a first edge and a second edge opposite each other in the length direction, with a groove at a position near the first edge of the manifold body; The lead portion is connected to the sidewall of the groove near the first edge, and the lead portion is bent toward the first side relative to the body portion. The shape of the lead portion matches that of the groove. The bus body includes an extension located between the lead portion and the first edge. The lead portion is used to connect to the junction box of the battery assembly.

2. The intermediate busbar according to claim 1, wherein, The groove completely penetrates the manifold body in the thickness direction.

3. The intermediate busbar according to claim 1, wherein, The length of the extension is 0.5mm-20mm.

4. The intermediate busbar according to claim 3, wherein, The length of the extension is 0.5mm-2.5mm.

5. The intermediate busbar according to claim 1, wherein, The width of the lead portion is less than 10mm.

6. The intermediate busbar according to claim 1, wherein, The length of the lead portion is 20mm-25mm.

7. The intermediate busbar according to claim 1, wherein, The lead portion includes a first part and a second part. The first part is connected to the sidewall of the groove facing the first edge. The second part is connected to the first part. The width of the second part is smaller than the width of the first part. The second part is used to connect to the junction box of the battery assembly.

8. The intermediate busbar according to claim 7, wherein, The second part satisfies at least one of the following: The width of the second part is less than 10mm; The length of the second part is 12mm-18mm.

9. The intermediate busbar according to claim 2, wherein, The intermediate busbar also includes a folded portion connected to the first edge, the folded portion being bent toward the second side relative to the busbar body and stacked on the second side of the busbar body, the folded portion covering at least a portion of the groove.

10. A battery assembly, wherein, include: A parallel battery string unit, the parallel battery string unit includes a first battery string and a second battery string arranged along a first direction, the first battery string and the second battery string each including a plurality of battery cells connected in series along the first direction; The intermediate busbar according to any one of claims 1-9, wherein the intermediate busbar is used to connect the first battery string and the second battery string in parallel; A junction box, wherein the lead wire is inserted into the junction box and electrically connected to the junction box.

11. A photovoltaic system, wherein, Includes the battery assembly as described in claim 10.

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