Photovoltaic module and conductive backboard

Abstract

The utility model discloses a photovoltaic module and a conductive backboard, the photovoltaic module comprises a plurality of battery pieces and a conductive backboard, and the plurality of battery pieces are laid on the conductive backboard; the conductive backboard comprises an insulating layer, a conductive layer, a substrate and a middle bus piece. The conductive layer comprises a plurality of conductive sheets separated by insulation gaps, and each conductive sheet comprises a base part and an electrode part; an electric connecting part is arranged on the electrode part, and the electric connecting part penetrates through the through hole in the insulating layer to be electrically connected with the battery piece; the middle confluence piece is arranged on the base part of the middle conducting strip and is electrically connected with the corresponding base part; the width D1 of the middle confluence piece and the width S1 of the base portion of the middle conducting strip meet the condition that D1 / S1 is larger than or equal to 0.27 and smaller than or equal to 0.8. Therefore, sufficient contact and connection between the intermediate bus piece and the base part of the intermediate conducting strip are ensured, the contact resistance is reduced, the bus capacity of the intermediate bus piece is improved, meanwhile, certain fault tolerance to the preparation process can be ensured, and the risk of short circuit between the intermediate bus piece and the adjacent anisotropic conducting strip is reduced.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic technology, specifically relating to a photovoltaic module and a conductive backsheet. Background Technology

[0002] A back-contact (BC) cell is a type of solar cell where the PN junction and metal electrodes are located on the back side of the solar cell. This type of solar cell has no electrodes blocking the front side, thereby increasing the area of ​​the cell that absorbs sunlight and improving the photoelectric conversion efficiency.

[0003] In related technologies, a patterned conductive metal layer is set in the backsheet of the module to achieve conductive interconnection between multiple solar cells. A busbar is then welded to the conductive metal layer to lead the current generated by the solar cells to the outside of the photovoltaic module. However, an unreasonable connection structure when connecting the busbar to the patterned conductive metal layer can easily affect the current collection capability of the busbar. Utility Model Content

[0004] This application aims to provide a photovoltaic module and a conductive backsheet that can solve the problem in related technologies where an unreasonable connection structure can easily affect the current collection capacity of the busbar when it is connected to the patterned conductive metal layer in a photovoltaic module.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application propose a photovoltaic module, comprising: a plurality of solar cells and a conductive backsheet, wherein the plurality of solar cells are laid on the conductive backsheet; the conductive backsheet comprises an insulating layer, a conductive layer, a substrate and an intermediate busbar, wherein the insulating layer, the conductive layer and the substrate are stacked sequentially.

[0007] The conductive layer includes a plurality of conductive sheets spaced apart by insulating gaps, and each conductive sheet includes a base and an electrode portion extending from one or both sides of the base along a first direction.

[0008] The electrode section is provided with an electrical connection part, which passes through a through hole in the insulating layer and is electrically connected to the battery cell; several battery cells are electrically interconnected through a conductive layer.

[0009] Along the first direction, the conductive sheet located at the middle position of the conductive back plate is called the intermediate conductive sheet, and the intermediate busbar is located on the base of the intermediate conductive sheet and electrically connected to the corresponding base; along the first direction, the width of the intermediate busbar is D1, and the width of the base of the intermediate conductive sheet is S1, satisfying: 0.27≤D1 / S1≤0.8.

[0010] Secondly, embodiments of this application propose a conductive backsheet for use in a photovoltaic module of the first aspect, comprising: a substrate, a conductive layer, an insulating layer, and an intermediate busbar, wherein the insulating layer, the conductive layer, and the substrate are stacked sequentially.

[0011] The conductive layer includes a plurality of conductive sheets separated by insulating gaps. Each conductive sheet includes a base and an electrode portion extending from one or both sides of the base along a first direction. The electrode portion is provided with an electrical connection portion for electrical connection with a battery cell. The insulating layer is provided with through holes at positions corresponding to the electrical connection portions.

[0012] Along the first direction, the conductive sheet located in the middle of the conductive back plate is called the intermediate conductive sheet, and the intermediate busbar is located on the base of the intermediate conductive sheet and electrically connected to the base; along the first direction, the width of the intermediate busbar is D1, and the width of the base of the intermediate conductive sheet is S2, satisfying: 0.27≤D1 / S2≤0.8.

[0013] In this application, multiple solar cells can be electrically interconnected through the conductive layer in the conductive backsheet. Compared to traditional photovoltaic modules, this saves the steps of laying and welding the solder strips, thus improving the production efficiency of photovoltaic modules. An intermediate busbar is integrated into the conductive backsheet to collect and discharge current to the photovoltaic module. Furthermore, the intermediate busbar is placed on the base of the intermediate conductive sheet, and by setting the ratio of the width of the intermediate busbar to the width of the base of the intermediate conductive sheet, sufficient contact and connection between the intermediate busbar and the base of the intermediate conductive sheet are ensured. This helps to increase the connection strength between the intermediate busbar and the intermediate conductive sheet, reduce contact resistance, and improve the current collection capacity of the intermediate busbar. At the same time, it also ensures a certain degree of fault tolerance to the manufacturing process and reduces the risk of short circuit between the intermediate busbar and adjacent dissimilar conductive sheets.

[0014] Additional aspects and advantages of this application 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 application. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is one of the partial structural schematic diagrams of the photovoltaic module corresponding to the intermediate busbar according to an embodiment of this application;

[0017] Figure 2 This is a second partial structural schematic diagram of the photovoltaic module corresponding to the intermediate busbar according to an embodiment of this application;

[0018] Figure 3 This is one of the partial structural schematic diagrams of the photovoltaic module at the corresponding edge busbar according to an embodiment of this application;

[0019] Figure 4 This is a second partial structural schematic diagram of the photovoltaic module at the corresponding edge busbar according to an embodiment of this application;

[0020] Figure 5 This is a cross-sectional structural schematic diagram of a photovoltaic module according to an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of an intermediate bus according to an embodiment of this application;

[0022] Figure 7 This is a schematic diagram of a conductive sheet according to an embodiment of this application;

[0023] Figure 8 This is a schematic diagram of another conductive sheet according to an embodiment of this application.

[0024] Figure label:

[0025] 10: Conductive backplate; 11: Insulating layer; 110: Through hole; 12: Conductive layer; 121: Conductive sheet; 121a: Middle conductive sheet; 121b: Edge conductive sheet; 1211: Base; 1211a: First base; 1211b: Second base; 1212: Electrode part; 122: Insulating gap; 13: Substrate; 14a: Middle busbar; 141: Busbar body; 142: Solder flux layer; 14b: Edge busbar; 20: Battery cell; 21: Electrical connection part; 30: Encapsulating film layer; 40: Cover plate; X: First direction; Z: Second direction; Y: Third direction. Detailed Implementation

[0026] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated 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. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0029] 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] The photovoltaic modules and conductive backsheets provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0031] like Figure 1 , Figure 2 and Figure 5 As shown, a photovoltaic module according to some embodiments of this application includes: a plurality of solar cells 20 and a conductive backsheet 10, wherein the plurality of solar cells 20 are disposed on the conductive backsheet 10; the conductive backsheet 10 includes an insulating layer 11, a conductive layer 12, a substrate 13 and an intermediate busbar 14a, wherein the insulating layer 11, the conductive layer 12 and the substrate 13 are sequentially stacked; the conductive layer 12 includes a plurality of conductive sheets 121 separated by insulating gaps 122, wherein the conductive sheet 121 includes a base 1211 and an electrode portion 1212 extending from one or both sides of the base 1211 along a first direction X (e.g., ...). Figure 7 and Figure 8 (As shown); an electrical connection portion 21 is provided on the electrode portion 1212, and the electrical connection portion 21 passes through the through hole 110 on the insulating layer 11 and is electrically connected to the battery cell 20; a plurality of battery cells 20 are electrically interconnected through the conductive layer 12; along the first direction X, the conductive sheet 121 located at the middle position of the conductive back plate 10 is the intermediate conductive sheet 121a, and the intermediate busbar 14a is located on the base 1211 of the intermediate conductive sheet 121a and is electrically connected to the corresponding base 1211; along the first direction X, the width of the intermediate busbar 14a is D1, and the width of the base 1211 of the intermediate conductive sheet 121a (that is, the first base 1211a mentioned below) is S1, satisfying: 0.27≤D1 / S1≤0.8.

[0032] In this embodiment, the conductive layer 12 in the conductive backsheet 10 enables the conductive interconnection of multiple solar cells 20, which saves the process of laying and welding the solder strips compared to traditional photovoltaic modules, thereby improving the production efficiency of photovoltaic modules. An intermediate busbar 14a is integrated in the conductive backsheet 10 to collect current and guide it out of the photovoltaic module. Furthermore, the intermediate bus 14a is disposed on the base 1211 of the intermediate conductive sheet 121a. By setting the ratio range of the width of the intermediate bus 14a to the width of the base 1211 of the intermediate conductive sheet 121a, sufficient contact and connection between the intermediate bus 14a and the base 1211 of the intermediate conductive sheet 121a are ensured. This helps to increase the connection strength between the intermediate bus 14a and the intermediate conductive sheet 121a, reduce the contact resistance, and improve the current-carrying capacity of the intermediate bus 14a. At the same time, it can also ensure a certain degree of fault tolerance to the manufacturing process and reduce the risk of short circuit between the intermediate bus 14a and the adjacent heterogeneous conductive sheet 121.

[0033] It is understandable that the current collecting capability and transmission efficiency of the intermediate bus 14a depend on the contact resistance between the intermediate bus 14a and the intermediate conductive sheet 121a, as well as the bulk resistance of the intermediate bus 14a. Among these factors, the contact resistance has a greater impact on the current collecting and transmission capability of the intermediate bus 14a than the bulk resistance. When D1 / S1 is less than 0.27, the size of the intermediate bus 14a is smaller than the base 1211 of the intermediate conductive sheet 121a, resulting in a smaller effective connection area. This is not conducive to the connection operation between the intermediate bus 14a and the intermediate conductive sheet 121a, and it also increases the contact resistance between the intermediate bus 14a and the intermediate conductive sheet 121a, thus reducing the current collecting capability and transmission efficiency of the intermediate bus 14a.

[0034] When D1 / S1 is greater than 0.8, although sufficient connection area can be ensured between the intermediate busbar 14a and the base 1211 of the intermediate conductive sheet 121a, the width of the intermediate busbar 14a is close to the width of the base 1211 of the intermediate conductive sheet 121a. Therefore, high alignment accuracy is required during the welding operation. If the position of the intermediate busbar 14a is offset, it will cause the intermediate busbar 14a to short-circuit with the adjacent non-polar conductive sheet 121, resulting in an increase in the failure rate of the photovoltaic module.

[0035] Specifically, the ratio D1 / S1 of the width D1 of the intermediate busbar 14a to the width S1 of the base 1211 of the intermediate conductive sheet 121a can be set to any value or a range between any two values, such as 0.27, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8.

[0036] In some embodiments, such as Figure 5 As shown, the photovoltaic module includes a cover plate 40, an encapsulating film layer 30, solar cells 20, an electrical connection portion 21, and a conductive backplate 10 stacked sequentially. The materials used to prepare the cover plate 40 and the encapsulating film layer 30 can be flexibly chosen according to actual conditions, and this application does not impose any limitations on them.

[0037] The solar cell 20 in this application can be a solar cell 20 with high front-side power generation efficiency, for example, it can be a back contact cell, including but not limited to: IBC cell (interdigitated back contact cell), TBC cell (TOPCon back contact cell), HBC cell (heterojunction back contact cell), HPBC cell (composite passivated back contact cell) or hybrid back contact cell.

[0038] Specifically, the solar cell 20 in this application can be configured as an IBC cell (interdigitated back contact cell). The solar cell 20 includes a silicon substrate, and the back surface of the silicon substrate has alternating first and second doped regions arranged in an interdigitated structure. Correspondingly, electrodes arranged in different doped regions are also alternately distributed, and the electrodes located in the first and second doped regions have different conductivity types. The conductive layer 12 in the conductive backplate 10 is used for conductive interconnection between the solar cells 20. Therefore, the arrangement structure of the conductive sheets 121 in the conductive layer 12 matches the arrangement structure of the electrodes in the solar cell 20, and is also in an interdigitated structure.

[0039] In some embodiments, the conductive backplate 10 is an insulating layer 11 on the side near the battery cell 20. The insulating layer 11 can be made of a transparent or translucent insulating material, such as polyethylene. Of course, other materials can also be used, and the choice can be made as needed. No specific limitation is made here.

[0040] Furthermore, a plurality of through holes 110 are provided in the insulating layer 11, and the through holes 110 correspond to the electrodes on the battery cell 20. The electrodes on the battery cell 20 include a positive electrode and a negative electrode. An electrical connection portion 21 is provided in the through hole 110, and the electrical connection portion 21 passes through the insulating layer 11. One end of the electrical connection portion 21 is electrically connected to the electrode on the battery cell 20, and the other end of the electrical connection portion 21 is electrically connected to the conductive layer 12 in the conductive back plate 10.

[0041] In the conductive backplate 10, the conductive layer 12 can be made of one or more of copper, aluminum, copper-aluminum alloy, and aluminum-nickel alloy. Multiple conductive sheets 121 are formed in the conductive layer 12. Adjacent conductive sheets 121 are separated by an insulating gap 122. The insulating gap 122 can be a hollow structure formed in the conductive layer 12 to isolate the positive and negative electrodes.

[0042] In specific applications, a conductive layer 12 can be formed on the substrate 13 using a conductive material. Then, according to a preset pattern, an etching tool such as a laser is used to etch the area in the conductive layer 12 where the insulating gap 122 is set, and excess conductive layer material is removed, thereby forming the insulating gap 122.

[0043] The electrical connection part 21 can be made of conductive material, such as solder paste or conductive adhesive, and is formed between the battery cell 20 and the conductive layer 12 by heating or infrared curing. The material of the electrical connection part 21 can be selected from tin-bismuth alloys, such as tin-bismuth alloy, tin-lead-bismuth alloy, tin-bismuth-copper alloy, tin-bismuth-silver alloy, etc.

[0044] It should be noted that in the conductive backplate 10, a backplate adhesive layer is provided on the side of the substrate 13 facing the conductive layer 12. The backplate adhesive layer can be made of one or a combination of two of the following materials: ethylene-octene copolymer (POE) and ethylene-vinyl acetate copolymer (EVA). By providing the backplate adhesive layer, the conductive layer 12 and the substrate 13 can be connected and fixed, and the conductive layer 12 can also be encapsulated and protected. The substrate 13 can be made of inorganic glass, plexiglass, organic polymer materials, etc., and can be flexibly set according to actual needs, without limitation here.

[0045] Optionally, such as Figure 2 As shown, along the first direction X, the width D1 of the intermediate busbar 14a satisfies: 4mm≤D1≤8mm.

[0046] In this application, by setting a reasonable range of values ​​for the width D1 of the intermediate busbar 14a, it is possible to ensure that the intermediate busbar 14a has sufficient area to connect with the intermediate conductive sheet 121a, thereby ensuring the current collection capacity of the intermediate busbar 14a. At the same time, it is possible to avoid the intermediate busbar 14a being too wide and requiring too much arrangement space, thus causing a waste of internal space in the photovoltaic module.

[0047] Specifically, the width D1 of the intermediate busbar 14a can be set to any value such as 4mm, 5mm, 6mm, 7mm, 8mm, or any range between two values.

[0048] Optionally, such as Figure 2 As shown, the width S1 of the base 1211 (i.e., the first base 1211a) of the intermediate conductive sheet 121a satisfies: 10mm≤S1≤15mm.

[0049] It is understandable that when the width S1 of the base 1211 of the intermediate conductive sheet 121a is less than 10mm, the width of the base 1211 of the intermediate conductive sheet 121a is too small, and there is not enough space on the base 1211 of the intermediate conductive sheet 121a for setting the intermediate bus 14a. This cannot guarantee the connection strength between the base 1211 of the intermediate conductive sheet 121a and the intermediate bus 14a, and will also increase the contact resistance between the intermediate conductive sheet 121a and the intermediate bus 14a, affecting the current collection capability of the intermediate bus 14a.

[0050] When the width S1 of the base 1211 of the intermediate conductive sheet 121a is greater than 15mm, the width of the base 1211 of the intermediate conductive sheet 121a becomes too large. Although this is beneficial for the connection between the base 1211 of the intermediate conductive sheet 121a and the intermediate busbar 14a, the gap between the solar cells 20 is proportional to the width of the base 1211 of the conductive sheet 121 when arranging the solar cells 20. Therefore, this results in an excessively large gap between the solar cells 20 corresponding to the intermediate conductive sheet 121a, causing wasted space inside the photovoltaic module. In addition, setting an excessively wide base 1211 of the intermediate conductive sheet 121a also increases production costs.

[0051] Therefore, by setting a reasonable range of values ​​for the width S1 of the base 1211 of the intermediate conductive sheet 121a in this application, it is possible to ensure that the base 1211 of the intermediate conductive sheet 121a has sufficient area for connection with the intermediate busbar 14a, thereby ensuring the current collection capability of the intermediate busbar 14a. At the same time, it helps to improve the compactness of the battery cell 20 on the conductive backplate 10 and improve space utilization.

[0052] Specifically, the width S1 of the base 1211 of the intermediate conductive sheet 121a can be set to any value or a range between any two values, such as 10mm, 11mm, 12mm, 13mm, 14mm, 15mm.

[0053] In some embodiments, the intermediate busbar 14a is disposed on the side of the intermediate conductive sheet 121a facing the battery cell 20, and the insulating layer 11 covers the intermediate busbar 14a. In this application, by disposing the intermediate busbar 14a on the side of the intermediate conductive sheet 121a facing the battery cell 20 and covering the intermediate busbar 14a with the insulating layer 11, the welding operation between the intermediate busbar 14a and the intermediate conductive sheet 121a is facilitated.

[0054] In some other embodiments, the intermediate busbar 14a is disposed on the side of the intermediate conductive sheet 121a away from the battery cell 20. By disposing the intermediate busbar 14a on the side of the intermediate conductive sheet 121a away from the battery cell 20, the impact of disposing the intermediate busbar 14a on the electrical connection between the intermediate conductive sheet 121a and the battery cell 20 can be reduced.

[0055] Optionally, such as Figure 2 As shown, when the intermediate busbar 14a is provided on the side of the intermediate conductive sheet 121a facing the battery cell 20, the minimum distance between the electrical connection portions 21 on both sides of the intermediate busbar 14a along the first direction X is S2, which satisfies: 0.2≤D1 / S2≤0.5.

[0056] It is understandable that when the intermediate busbar 14a is located on the side of the intermediate conductive sheet 121a facing the battery cell 20, if the ratio of D1 / S2 is less than 0.2, either the width D1 of the intermediate busbar 14a is too small, which will affect the current collection performance of the intermediate busbar 14a and fail to meet the performance requirements; or the minimum distance S2 between the electrical connection portions 21 on both sides of the intermediate busbar 14a is too large. In one case, this will result in an excessively large distance between the battery cells 20 electrically connected to the electrical connection portions 21, causing wasted space and hindering the arrangement of the battery cells 20. Alternatively, if the distance between the corresponding battery cells on both sides of the intermediate busbar 14a remains unchanged, the position of the electrical connection portions 21 at the edge of the battery cell needs to be adjusted to increase the distance between the electrical connection portions 21 on both sides of the intermediate busbar 14a. This will increase the current transmission distance at the edge of the battery cell and reduce the current collection efficiency of the electrical connection portions 21 in the battery cell.

[0057] When the ratio of D1 / S2 is greater than 0.5, either the width D1 of the intermediate busbar 14a is too large, or the minimum spacing S2 between the electrical connection portions 21 on both sides of the intermediate busbar 14a is too small. This will cause the edges of the intermediate busbar 14a to be too close to the adjacent electrical connection portions 21. Due to the raising effect of the intermediate busbar 14a between the battery cell 20 and the intermediate conductive sheet 121a, the intermediate busbar 14a will affect the forming of the electrical connection portions 21, leading to loose connections between the electrical connection portions 21 and the battery cell 20 and / or the electrode portion 1212, increasing contact resistance, and thus reducing the current transmission performance between the battery cell 20 and the electrode portion 1212.

[0058] Specifically, the ratio D1 / S2 of the width D1 of the intermediate busbar 14a to the minimum spacing S2 can be set to any value or a range between any two values, such as 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5.

[0059] Optionally, such as Figure 2 As shown, the minimum spacing S2 between the electrical connection portions 21 on both sides of the intermediate busbar 14a along the first direction X satisfies: 16mm≤S2≤20mm.

[0060] In this embodiment of the application, by setting a reasonable range of minimum spacing S2 between the electrical connection portions 21 on both sides of the intermediate busbar 14a, it is possible to ensure that there is enough space between the two electrical connection portions 21 for setting the intermediate busbar 14a; at the same time, it is also possible to avoid the space being wasted due to the excessive gap between the two electrical connection portions 21, and to take into account the compactness of the battery cell 20 layout.

[0061] Specifically, the minimum spacing S2 can be set to any value such as 16mm, 17mm, 18mm, 19mm, 20mm, or any range between two values.

[0062] Optionally, such as Figure 5 As shown, the direction from the battery cell 20 to the conductive backplate 10 is the second direction Z; when the intermediate busbar 14a is provided on the side of the intermediate conductive sheet 121a facing the battery cell 20, the thickness of the intermediate busbar 14a along the second direction Z is H1, and the height of the electrical connection portion 21 along the second direction Z is H2, satisfying: 0.5≤H1 / H2≤1.7.

[0063] In this embodiment, by setting a reasonable range of the ratio H1 / H2 of the thickness H1 of the intermediate busbar 14a to the height H2 of the electrical connection portion 21, the current-gathering performance of the intermediate busbar 14a can be guaranteed, while avoiding the influence of the intermediate busbar 14a on the processing and forming of the electrical connection portion 21, thus ensuring the conductive connection function of the electrical connection portion 21 between the battery cell 20 and the intermediate conductive sheet 121a.

[0064] Understandably, when H1 / H2 is less than 0.5, either the thickness H1 of the intermediate busbar 14a is too thin, resulting in a small cross-sectional area and reduced current collection and transmission capacity; or the height H2 of the electrical connection 21 is too large, resulting in a large volume of the electrical connection 21, which not only wastes materials but also makes it easy for too many electrical connections 21 to overflow into the insulation gap, causing short circuit problems.

[0065] When H1 / H2 is greater than 1.7, either the thickness H1 of the intermediate busbar 14a is too thick, and the height of the intermediate busbar 14a will affect the processing and forming of the electrical connection part 21, causing a loose connection between the electrical connection part 21 and the intermediate conductive sheet 121a and / or the battery cell 20, affecting the conductivity between the intermediate conductive sheet 121a and the battery cell 20, and the excessively thick intermediate busbar 14a has performance redundancy and waste; or the height H2 of the electrical connection part 21 is too small, making the volume of the electrical connection part 21 too small to meet the conductivity connection requirements between the battery cell 20 and the intermediate conductive sheet 121a. Furthermore, because the volume of the electrical connection part 21 is too small, it is prone to loose connections with the intermediate conductive sheet 121a and / or the battery cell 20, affecting the current transmission between the intermediate conductive sheet 121a and the battery cell 20.

[0066] Specifically, the ratio H1 / H2 of the thickness H1 of the intermediate busbar 14a to the height H2 of the electrical connection portion 21 can be set to any value or a range between any two values, such as 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4.

[0067] In some embodiments, the thickness H1 of the intermediate busbar 14a can be set to 0.2mm-0.5mm. For example, H1 can be set to 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc.

[0068] In other embodiments, the height H2 of the electrical connection portion 21 can be set to 0.2mm-0.25mm, for example, H2 can be set to 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, etc.

[0069] Optionally, the conductive layer 12 is a copper foil layer. It is understood that, compared to the traditional method of using solder ribbons to achieve conductive interconnection of multiple solar cells 20, this application uses a copper foil layer as the conductive layer 12 to ensure the conductivity of the conductive layer 12, thereby enabling conductive interconnection of multiple solar cells 20. Furthermore, compared to traditional solder ribbons, using a copper foil layer can also reduce production costs.

[0070] Furthermore, an aluminum foil layer can be provided on the side of the copper foil layer facing the substrate 13, that is, the conductive layer 12 adopts a stacked structure of aluminum foil layer and copper foil layer. In this way, the conductive layer 12 can be guaranteed to have excellent conductivity, and at the same time, since the aluminum foil layer has good ductility, it is convenient to remove excess material during the patterning process of the conductive layer 12.

[0071] In the patterning process of the conductive layer 12, laser engraving or other methods can be used to engrave the area corresponding to the insulating gap 122 in the conductive layer 12, and then the metal foil in the area corresponding to the insulating gap 122 can be peeled off. During the peeling of excess metal foil, local breakage can easily occur, resulting in short circuits in the corresponding parts of the conductive layer 12. In this application, a laminated structure of aluminum foil layer and copper foil layer is used as the conductive layer 12. This improves the extensibility of the conductive layer 12, facilitates the actual peeling operation, and avoids the breakage problem during the peeling of excess metal foil.

[0072] Optionally, such as Figure 6 As shown, the intermediate busbar 14a includes a busbar body 141 and a flux layer 142. The direction from the battery cell 20 to the conductive backplate 10 is the second direction Z. The busbar body 141 is provided with flux layers 142 on both sides along the second direction Z. The thickness of the flux layer 142 on the side of the busbar body 141 facing the base 1211 is greater than the thickness of the flux layer 142 on the side of the busbar body 141 away from the base 1211.

[0073] In this embodiment, the bus body 141 of the intermediate bus 14a can be made of a conductive material, such as pure copper, brass, or aluminum alloy, serving as the main body of the intermediate bus 14a and providing connection and conductivity. Furthermore, flux layers 142 are provided on opposite sides of the bus body 141, for example, made of solder paste or other fluxing materials. The flux layers 142 enhance the soldering capability of the intermediate bus 14a.

[0074] Furthermore, by setting the thickness of the flux layer 142 on the side of the bus body 141 facing the base 1211 to be greater than the thickness of the flux layer 142 on the side of the bus body 141 away from the base 1211, the welding operation between the intermediate bus 14a and the base 1211 of the intermediate conductive sheet 121a is improved, thereby increasing the welding strength between the intermediate bus 14a and the intermediate conductive sheet 121a.

[0075] Optionally, such as Figure 1 As shown, along the first direction X, the spacing between any two adjacent battery cells 20 is equal.

[0076] It is understood that by adopting the structure of the photovoltaic module in this application, the intermediate busbar 14a can be integrated into the conductive backsheet 10, thus eliminating the need to reserve space specifically for arranging the intermediate busbar 14a when arranging the solar cells 20. This allows multiple solar cells 20 to be laid out more evenly on the conductive backsheet 10, ensuring equal spacing between any two adjacent solar cells 20, improving the compactness of the solar cell arrangement and enhancing the aesthetics of the photovoltaic module.

[0077] The spacing between two adjacent solar cells 20 can be flexibly set according to the actual design requirements of the photovoltaic module, and is not limited here.

[0078] Optionally, along the first direction X, the width of the base 1211 (i.e., the first base 1211a) of the intermediate conductive sheet 121a is greater than the width of the base 1211 (i.e., the second base 1211b) of the conductive sheet 121 other than the intermediate conductive sheet 121a in the conductive layer 12.

[0079] In this embodiment, by increasing the width of the base 1211 of the intermediate conductive sheet 121a, the width of the base 1211 of the intermediate conductive sheet 121a is made greater than the width of the base 1211 of the conductive sheets 121 in the conductive layer 12 other than the intermediate conductive sheet 121a. This provides sufficient space for the base 1211 of the intermediate conductive sheet 121a to accommodate the intermediate busbar 14a, thereby increasing the contact area between the intermediate conductive sheet 121a and the intermediate busbar 14a. This not only improves the connection strength but also enhances the conductivity between the intermediate conductive sheet 121a and the intermediate busbar 14a.

[0080] Optionally, the base 1211 of the intermediate conductive sheet 121a is a first base 1211a (e.g., Figure 2 As shown), the base 1211 of the conductive sheet 121 in the conductive layer 12, excluding the intermediate conductive sheet 121a, is the second base 1211b (as shown). Figure 1 (As shown); along the first direction X, the spacing between the electrical connection portions 21 located on both sides of the first base 1211a is greater than the spacing between the electrical connection portions 21 located on both sides of the second base 1211b.

[0081] It is understandable that the intermediate busbar 14a is disposed on the first base 1211a of the intermediate conductive sheet 121a. If the spacing between the electrical connection portions 21 on both sides of the first base 1211a is too small, the intermediate busbar 14a will be too close to the electrical connection portions 21 on both sides. Due to the padding effect of the intermediate busbar 14a, the processing and forming of the electrical connection portion 21 between the battery cell 20 and the electrode portion 1212 will be affected, which may easily cause poor connection between the battery cell 20 and the electrode portion 1212. At the same time, it may also easily lead to the risk of short circuit between the intermediate busbar 14a and the electrical connection portion 21 of the opposite orientation.

[0082] Therefore, in this application, the spacing between the electrical connection portions 21 on both sides of the first base 1211a is increased so that the spacing between the electrical connection portions 21 on both sides of the first base 1211a is greater than the spacing between the electrical connection portions 21 on both sides of the second base 1211b, so that the intermediate busbar 14a can be reasonably arranged on the first base 1211a and the impact of setting the intermediate busbar 14a on the electrical connection portions 21 is reduced.

[0083] In some embodiments, the intermediate busbar 14a and the intermediate conductive sheet 121a are integrally formed. By making the intermediate busbar 14a and the intermediate conductive sheet 121a an integral structure, the welding operation of the intermediate busbar 14a and the intermediate conductive sheet 121a can be saved during the photovoltaic module manufacturing process. At the same time, the integral structure of the intermediate busbar 14a and the intermediate conductive sheet 121a can ensure both the connection strength between the intermediate busbar 14a and the intermediate conductive sheet 121a and the conductivity between the intermediate busbar 14a and the intermediate conductive sheet 121a.

[0084] In other embodiments, the intermediate busbar 14a and the intermediate conductive sheet 121a are separate molded parts. By making the intermediate busbar 14a and the intermediate conductive sheet 121a into separate structures, it is easier to design and process the intermediate busbar 14a and the intermediate conductive sheet 121a separately, making the application more flexible and thus able to meet different application scenarios.

[0085] It is understandable that the intermediate busbar 14a and the intermediate conductive sheet 121a can be made of the same material or different materials, and can be flexibly set according to actual needs, without limitation here.

[0086] Optionally, such as Figure 3 and Figure 4 As shown, the conductive backplate 10 also includes an edge busbar 14b; along the first direction X, the conductive sheet 121 disposed at the edge position of the conductive backplate 10 is an edge conductive sheet 121b, and the edge busbar 14b is disposed on the base 1211 of the edge conductive sheet 121b and electrically connected to the corresponding base 1211; the edge busbar 14b and the base 1211 of the edge conductive sheet 121b are at least partially overlapped.

[0087] In this embodiment, by providing an edge busbar 14b on the base 1211 of the edge conductive sheet 121b, the current collected by the electrode portion 1212 of the edge conductive sheet 121b is gathered using the edge busbar 14b. Furthermore, by making the edge busbar 14b at least partially overlap with the base 1211 of the edge conductive sheet 121b, the connection strength between the edge busbar 14b and the edge conductive sheet 121b is increased, the current gathering capacity of the edge busbar 14b is also increased, and the space required to provide the edge busbar 14b is reduced.

[0088] The edge busbar 14b and the base 1211 of the edge conductive sheet 121b are at least partially overlapped along the thickness direction of the photovoltaic module, and the orthographic projection of the edge busbar 14b at least partially coincides with the orthographic projection of the base 1211 of the edge conductive sheet 121b. The thickness direction of the photovoltaic module is also the stacking direction of the insulating layer 11, the conductive layer 12, and the substrate 13 in the conductive backsheet 10.

[0089] In some embodiments, the edge busbar 14b can be entirely located on the base 1211 of the edge conductive sheet 121b, that is, along the thickness direction of the photovoltaic module, the orthographic projection of the edge busbar 14b is entirely within the orthographic projection of the base 1211 of the edge conductive sheet 121b. This increases the contact area between the edge busbar 14b and the base 1211 of the edge conductive sheet 121b, thereby reducing contact resistance and helping to improve the current collection capability and current transmission rate of the edge busbar 14b.

[0090] In some embodiments, the edge busbar 14b is disposed on the side of the edge conductive sheet 121b facing the battery cell 20, and the insulating layer 11 covers the edge busbar 14b. In this application, by disposing the edge busbar 14b on the side of the edge conductive sheet 121b facing the battery cell 20 and covering the edge busbar 14b with the insulating layer 11, the welding operation between the edge busbar 14b and the edge conductive sheet 121b is facilitated.

[0091] In other embodiments, the edge busbar 14b is disposed on the side of the edge conductive sheet 121b facing away from the battery cell 20. By disposing the edge busbar 14b on the side of the edge conductive sheet 121b facing away from the battery cell 20, the impact of disposing the edge busbar 14b on the electrical connection between the edge conductive sheet 121b and the battery cell 20 can be reduced.

[0092] Optionally, such as Figure 4 As shown, along the first direction X, the width of the edge bus 14b is D2, and the width of the base 1211 of the edge conductive sheet 121b is S3, satisfying: 0.3≤D2 / S3≤0.8.

[0093] In this embodiment, by setting a reasonable range for the ratio D2 / S3 of the width D2 of the edge busbar 14b to the width S3 of the base 1211 of the edge conductive sheet 121b, the effective connection area between the edge busbar 14b and the edge conductive sheet 121b can be guaranteed, thereby reducing contact resistance and improving the current collection performance of the edge busbar 14b. At the same time, it has a certain degree of tolerance for the manufacturing process, which facilitates the processing of photovoltaic modules.

[0094] It is understandable that if the ratio of D2 / S3 is less than 0.3, that is, the difference between the width D2 of the edge bus 14b and the width S3 of the base 1211 of the edge conductive sheet 121b is too large, the effective connection area between the edge bus 14b and the edge conductive sheet 121b is too small, resulting in too large contact resistance, affecting the current transmission between the edge bus 14b and the edge conductive sheet 121b, and reducing the busing performance of the edge bus 14b.

[0095] When the ratio of D2 / S3 is greater than 0.8, the width D2 of the edge busbar 14b and the width S3 of the base 1211 of the edge conductive sheet 121b are relatively close. During the photovoltaic module manufacturing process, the alignment accuracy of the edge busbar 14b and the edge conductive sheet 121b is required to be high. Otherwise, if the edge busbar 14b is offset, it is easy to short-circuit with the adjacent heterogeneous electrode part 1212.

[0096] Specifically, the ratio D2 / S3 of the width D2 of the edge busbar 14b to the width S3 of the base 1211 of the edge conductive sheet 121b can be set to any value such as 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or any range between any two values.

[0097] In some embodiments, the width D2 of the edge busbar 14b satisfies: 2mm ≤ D2 ≤ 4mm. Specifically, D2 can be set to: 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

[0098] In this application, by setting a reasonable range for the width D2 of the edge busbar 14b, it is possible to ensure that the edge busbar 14b has sufficient area for connection with the edge conductive sheet 121b, thereby ensuring the current collection capacity of the edge busbar 14b. Simultaneously, this helps to improve the compactness of the internal structure of the photovoltaic module and increase space utilization. If the width of the edge busbar 14b is too wide, it will require more arrangement space, resulting in wasted internal space of the photovoltaic module, and there will also be performance redundancy of the edge busbar 14b, leading to material waste. Conversely, if the width of the edge busbar 14b is too narrow, it will reduce both the current collection capacity of the edge busbar 14b and the connection strength between the edge busbar 14b and the edge conductive sheet 121b.

[0099] In other embodiments, the width S3 of the base 1211 of the edge conductive sheet 121b satisfies: 5mm ≤ S3 ≤ 8mm. Specifically, S3 can be set to: 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.

[0100] In this application, by setting a reasonable range for the width S3 of the base 1211 of the edge conductive sheet 121b, it is possible to ensure that the base 1211 of the edge conductive sheet 121b has sufficient area for connection with the edge busbar 14b, thus ensuring the current collection capacity of the edge busbar 14b. At the same time, it helps to improve the compactness of the cell arrangement on the conductive backsheet 10 and improve space utilization. If the width S3 of the base 1211 of the edge conductive sheet 121b is too small, there will not be enough space for setting the edge busbar 14b. If the width S3 of the base 1211 of the edge conductive sheet 121b is too large, it will cause waste of space on the base 1211 of the edge conductive sheet 121b, which is not conducive to the layout of the cells inside the photovoltaic module and will also increase production costs.

[0101] Optionally, along the first direction X, the distance from the edge bus 14b to the adjacent electrical connection 21 is S4, satisfying: 2.5mm≤S4≤8mm.

[0102] In this embodiment of the application, by setting a reasonable range of distance S4 from the edge busbar 14b to the adjacent electrical connection part 21, it is possible to ensure that there is a certain safety gap between the edge busbar 14b and the electrical connection part 21, so as to avoid short circuit between the edge busbar 14b and the electrical connection part 21 of the opposite orientation. At the same time, it is also possible to avoid the gap between the edge busbar 14b and the electrical connection part 21 being too large, which would cause space waste, and thus take into account the compactness of the battery cell 20 layout.

[0103] Understandably, if the distance S4 is less than 2.5mm, making the distance from the edge busbar 14b along the first direction X to its adjacent electrical connection 21 too small, it will not only affect the processing and forming of the electrical connection 21, but also, if the edge busbar 14b is offset, it is easy to short-circuit with the electrical connection 21 of the opposite direction, affecting the safety of the photovoltaic module. On the other hand, if the distance S4 is greater than 8mm, making the distance from the edge busbar 14b along the first direction X to its adjacent electrical connection 21 too large, it will require more structural layout space in the photovoltaic module, resulting in wasted space.

[0104] Specifically, the distance S4 can be set to any value or a range between any two values, such as 2.5mm, 2.7mm, 3.0mm, 4mm, 5mm, 6mm, 7mm, 8mm, etc.

[0105] Optionally, such as Figure 4 As shown, the extension direction of the edge bus 14b is the third direction Y. Along the third direction Y, the distance from the end of the edge bus 14b to the edge of the corresponding edge conductive sheet 121b is L1. Along the third direction Y, the distance from the outermost electrical connection part 21 on the edge conductive sheet 121b to the edge of the edge conductive sheet 121b is L2, satisfying: L1≤L2.

[0106] In this embodiment of the application, by setting the distance L1 to be less than or equal to the distance L2, it can be ensured that the current collected by the electrical connection portion 21 in the edge conductive sheet 121b can be transmitted to the edge busbar 14b via the shortest path, thereby improving the transmission efficiency, reducing the transmission loss, and helping to improve the conversion efficiency of the photovoltaic module.

[0107] It is understandable that, such as Figure 4 As shown, the edge busbar 14b is disposed on the base 1211 of the edge conductive sheet 121b. A plurality of electrode portions 1212 are spaced apart on one side of the base 1211. Each electrode portion 1212 has a plurality of electrical connection portions 21 spaced apart along a first direction X. The electrical connection portions 21 are electrically connected to the battery cell 20. The electrode portions 1212 collect the current generated by the battery cell 20 through the electrical connection portions 21 and then collect it into the edge busbar 14b. The longer the path of the current generated in the battery cell 20 through the electrical connection portions 21, electrode portions 1212, and base 1211 to the edge busbar 14b, the greater the loss during transmission.

[0108] Therefore, in this application, by setting the length of the edge busbar 14b so that the distance L1 is less than or equal to the distance L2, it is ensured that the current in the electrical connection portion 21 on each electrode portion 1212 can be transmitted to the edge busbar 14b along the extension direction perpendicular to the edge busbar 14b, thereby ensuring the shortest transmission path and reducing current loss.

[0109] In some embodiments, the edge busbar 14b and the edge conductive sheet 121b are integrally formed. By making the edge busbar 14b and the edge conductive sheet 121b into an integral structure, the welding operation of the edge busbar 14b and the edge conductive sheet 121b can be saved during the photovoltaic module manufacturing process. At the same time, the integral structure of the edge busbar 14b and the edge conductive sheet 121b can ensure both the connection strength and the conductivity between the edge busbar 14b and the edge conductive sheet 121b.

[0110] In other embodiments, the edge busbar 14b and the edge conductive sheet 121b are separate molded parts. By making the edge busbar 14b and the edge conductive sheet 121b into separate structures, it is easier to design and process the edge busbar 14b and the edge conductive sheet 121b separately, making the application more flexible and thus able to meet different application scenarios.

[0111] It is understood that the edge busbar 14b and the edge conductive sheet 121b can be made of the same material or different materials, and can be flexibly set according to actual needs, without limitation here.

[0112] In some embodiments, flux layers may be provided on opposite sides of the edge busbar 14b. The specific structural configuration can be referred to the intermediate busbar 14a, and is not limited here.

[0113] Optionally, such as Figure 2 and Figure 4 As shown, the width D1 of the intermediate busbar 14a and the width D2 of the edge busbar 14b satisfy: 1 ​​< D1 / D2 ≤ 2.5.

[0114] Understandably, the intermediate bus 14a is connected to the base 1211 of the intermediate conductive sheet 121a. The intermediate bus 14a has electrode portions 1212 on both sides, thus requiring it to collect the current gathered by both electrode portions 1212 simultaneously. In contrast, the edge bus 14b is connected to the base 1211 of the edge conductive sheet 121b. The edge bus 14b has an electrode portion 1212 on only one side, thus requiring it to collect the current gathered by only one electrode portion 1212. Therefore, compared to the edge bus 14b, the intermediate bus 14a requires higher electrode collection capability and higher conductivity.

[0115] For the intermediate bus 14a and the edge bus 14b, under the same material conditions, their conductivity is positively correlated with the cross-sectional area of ​​the bus. Since the thickness of the intermediate bus 14a and the edge bus 14b is equal or similar, this application sets a reasonable range of values ​​for the width ratio D1 / D2 of the intermediate bus 14a and the edge bus 14b to match the different usage requirements of the intermediate bus 14a and the edge bus 14b respectively.

[0116] If the width ratio D1 / D2 between the intermediate busbar 14a and the edge busbar 14b is less than or equal to 1, meaning the edge busbar 14b is larger and has better conductivity, this contradicts the actual requirement and results in a waste of the edge busbar 14b. If the width ratio D1 / D2 between the intermediate busbar 14a and the edge busbar 14b is greater than 2.5, either the edge busbar 14b is too small to meet the current collection performance requirements, or the intermediate busbar 14a is too large, resulting in material waste and occupying a large installation space, affecting the overall structural design of the photovoltaic module.

[0117] Specifically, the ratio D1 / D2 of the width D1 of the intermediate busbar 14a to the width D2 of the edge busbar 14b can be set to any value or a range between any two values, such as 1.1, 1.2, 1.5, 1.7, 2, 2.3, 2.5.

[0118] Optionally, this application embodiment also provides a conductive backsheet 10, applied to the photovoltaic module in the above embodiment, including: a substrate 13, a conductive layer 12, an insulating layer 11, and an intermediate busbar 14a, wherein the insulating layer 11, the conductive layer 12, and the substrate 13 are stacked sequentially; the conductive layer 12 includes a plurality of conductive sheets 121 spaced apart by insulating gaps 122, and the conductive sheet 121 includes a base 1211 and an electrode portion 1212 extending from one or both sides of the base 1211 along a first direction X; the electrode portion 1212 is provided with a contact surface for contacting the solar cells. The electrical connection part 21 of the 20 electrical connection has an insulating layer 11 with a through hole 110 at a position corresponding to the electrical connection part 21; along the first direction X, the conductive sheet 121 located at the middle position of the conductive back plate 10 is the intermediate conductive sheet 121a, and the intermediate busbar 14a is located on the base 1211 of the intermediate conductive sheet 121a and is electrically connected to the base 1211; along the first direction X, the width of the intermediate busbar 14a is D1, and the width of the base 1211 of the intermediate conductive sheet 121a is S2, satisfying: 0.27≤D1 / S2≤0.8.

[0119] In this embodiment, the conductive layer 12 in the conductive backsheet 10 enables the conductive interconnection of multiple solar cells 20, which saves the process of laying and welding the solder strips compared to traditional photovoltaic modules, thereby improving the production efficiency of photovoltaic modules. An intermediate busbar 14a is integrated in the conductive backsheet 10 to collect current and guide it out of the photovoltaic module. Furthermore, the intermediate bus 14a is disposed on the base 1211 of the intermediate conductive sheet 121a. By setting the ratio range of the width of the intermediate bus 14a to the width of the base 1211 of the intermediate conductive sheet 121a, sufficient contact and connection between the intermediate bus 14a and the base 1211 of the intermediate conductive sheet 121a are ensured. This helps to increase the connection strength between the intermediate bus 14a and the intermediate conductive sheet 121a, reduce the contact resistance, and improve the current-carrying capacity of the intermediate bus 14a. At the same time, it can also ensure a certain degree of fault tolerance to the manufacturing process and reduce the risk of short circuit between the intermediate bus 14a and the adjacent heterogeneous conductive sheet 121.

[0120] It should be noted that the structure of the conductive backplate 10 in this embodiment can be configured according to the structure of the conductive backplate 10 described in any of the foregoing embodiments, and will not be repeated here.

[0121] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that 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.

[0122] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized by, The utility model relates to a kind of solar cell module, including: Several battery pieces and conductive back plate, several described battery piece is laid on the conductive back plate;The conductive back plate includes insulating layer, conductive layer, substrate and intermediate busbar, the insulating layer, the conductive layer and the substrate are sequentially stacked and set; The conductive layer includes a plurality of conductive pieces spaced apart by insulating gap, the conductive piece includes base and electrode part extending from one side or both sides of the base in the first direction; The electrode part is provided with electrical connection part, and the electrical connection part is electrically connected with the battery piece through the through hole on the insulating layer;Several described battery piece is conductively interconnected by the conductive layer; Along the first direction, the conductive piece provided in the intermediate position of the conductive back plate is the intermediate conductive piece, and the intermediate busbar is provided on the base of the intermediate conductive piece and is electrically connected with the corresponding base; Along the first direction, the width of the intermediate busbar is D1, and the width of the base of the intermediate conductive piece is S1, which satisfies: 0.27≤D1 / S1≤0.

8.

2. The photovoltaic module of claim 1, wherein, Along the first direction, the width D1 of the intermediate busbar satisfies: 4mm≤D1≤8mm; And / or, the width S1 of the base of the intermediate conductive piece satisfies: 10mm≤S1≤15mm.

3. The photovoltaic module of claim 1, wherein, The intermediate busbar is provided on the side of the intermediate conductive piece facing the battery piece, and the insulating layer covers the intermediate busbar;Or, the intermediate busbar is provided on the side of the intermediate conductive piece away from the battery piece.

4. The photovoltaic module of claim 3, wherein, In the case that the intermediate busbar is provided on the side of the intermediate conductive piece facing the battery piece, the minimum distance between the electrical connection parts located on both sides of the intermediate busbar along the first direction is S2, which satisfies: 0.2≤D1 / S2≤0.

5.

5. The photovoltaic module of claim 4, wherein, The minimum distance S2 between the electrical connection parts located on both sides of the intermediate busbar along the first direction satisfies: 16mm≤S2≤20mm.

6. The photovoltaic module of claim 3, wherein, The direction of the battery piece to the conductive back plate is the second direction;In the case that the intermediate busbar is provided on the side of the intermediate conductive piece facing the battery piece, the thickness of the intermediate busbar along the second direction is H1, and the height of the electrical connection part along the second direction is H2, which satisfies: 0.5≤H1 / H2≤1.

7.

7. The photovoltaic module of claim 1, wherein, The conductive layer is a copper foil layer;Or, the conductive layer is a laminated structure of an aluminum foil layer and a copper foil layer, and the aluminum foil layer is provided on the side of the copper foil layer facing the substrate.

8. The photovoltaic module of claim 1, wherein, The intermediate busbar includes a busbar body and a soldering layer, the direction of the battery piece to the conductive back plate is the second direction, the soldering layer is provided on both sides of the busbar body along the second direction, and the thickness of the soldering layer on the side of the busbar body facing the base is greater than the thickness of the soldering layer on the side of the busbar body away from the base.

9. The photovoltaic module of claim 1, wherein, Along the first direction, the distance between any two adjacent battery pieces is equal.

10. The photovoltaic module of claim 1, wherein, Along the first direction, the width of the base of the intermediate conductive piece is greater than the width of the base of the conductive piece other than the intermediate conductive piece in the conductive layer.

11. The photovoltaic module of claim 1, wherein, The base of the intermediate conductive tab is a first base, and the base of the conductive tab other than the intermediate conductive tab in the conductive layer is a second base; along the first direction, the interval between the electrical connection parts located on both sides of the first base is greater than the interval between the electrical connection parts located on both sides of the second base.

12. The photovoltaic module of claim 1, wherein, The intermediate busbar and the intermediate conductive tab are integrally formed; or, the intermediate busbar and the intermediate conductive tab are separately formed.

13. The photovoltaic module according to any of claims 1 to 12, characterized in that The conductive back plate further comprises an edge busbar; along the first direction, the conductive tab provided at the edge position of the conductive back plate is an edge conductive tab, and the edge busbar is provided on the base of the edge conductive tab and electrically connected with the corresponding base; the edge busbar and the base of the edge conductive tab are at least partially overlapped.

14. The photovoltaic module of claim 13, wherein, The edge busbar is provided on the side of the edge conductive tab facing the battery tab, and the insulating layer covers the edge busbar; or, the edge busbar is provided on the side of the edge conductive tab away from the battery tab.

15. The photovoltaic module of claim 13, wherein, Along the first direction, the width of the edge busbar is D2, and the width of the base of the edge conductive tab is S3, satisfying: 0.3≤D2 / S3≤0.

8.

16. The photovoltaic module of claim 15, wherein, The width D2 of the edge busbar satisfies: 2mm≤D2≤4mm; And / or, the width S3 of the base of the edge conductive tab satisfies: 5mm≤S3≤8mm.

17. The photovoltaic module of claim 13, wherein, Along the first direction, the distance from the edge busbar to the adjacent electrical connection part is S4, satisfying: 2.5mm≤S4≤8mm.

18. The photovoltaic module of claim 13, wherein, The extension direction of the edge busbar is a third direction, along the third direction, the distance from the end of the edge busbar to the edge of the corresponding edge conductive tab is L1, and the distance from the outermost electrical connection part on the edge conductive tab to the edge of the edge conductive tab is L2, satisfying: L1≤L2.

19. The photovoltaic module of claim 13, wherein, The edge busbar and the edge conductive tab are integrally formed; or, the edge busbar and the edge conductive tab are separately formed.

20. The photovoltaic module of claim 13, wherein, The width D1 of the intermediate busbar and the width D2 of the edge busbar satisfy: 1 21. An electrically conductive backsheet for use in a photovoltaic module according to any one of claims 1-20, characterized in that, Comprise: a substrate, a conductive layer, an insulating layer and an intermediate busbar, the insulating layer, the conductive layer and the substrate are sequentially stacked; The conductive layer comprises a plurality of conductive tabs spaced by insulating gaps, the conductive tab comprises a base and an electrode part extending from one side or both sides of the base along a first direction; the electrode part is provided with an electrical connection part for electrical connection with a battery tab, and the insulating layer is provided with a through hole at a position corresponding to the electrical connection part; Along the first direction, the conductive tab provided at the intermediate position of the conductive back plate is an intermediate conductive tab, and the intermediate busbar is provided on the base of the intermediate conductive tab and electrically connected with the base; Along the first direction, the width of the intermediate busbar is D1, and the width of the base of the intermediate conductive tab is S2, satisfying: 0.27≤D1 / S2≤0.

8.

22. The conductive backplane of claim 21, wherein, The conductive back plate further comprises: an edge busbar; along the first direction, the conductive sheet arranged at the edge position of the conductive back plate is an edge conductive sheet, and the edge busbar is arranged on and electrically connected with the base of the edge conductive sheet; and the edge busbar and the base of the edge conductive sheet are arranged at least partially overlapped.

23. The conductive backplane of claim 22, wherein, Along the first direction, the width of the edge busbar is D2, and the width of the base of the edge conductive sheet is S3, and the following condition is met: 0.3≤D2 / S3≤0.

8.

24. The conductive backplane of any of claims 21-23, wherein, The two adjacent conductive sheets are in a finger-shaped structure cooperation.

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