Wiring device
The multiple battery packs of the stacked photovoltaic module are connected through the bus line in the wiring device to form a parallel circuit structure, which solves the complex matching problem of the stacked photovoltaic module circuit and the inverter, and achieves the effect of simplifying wiring, reducing costs and power loss.
Patent Information
- Application Number
- CN202421305785.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-07
AI Technical Summary
Multiple sets of circuits of stacked photovoltaic modules need to be matched with multiple sets of inverters, resulting in complex wiring systems and increased production costs, which affects their promotion and application.
A wiring device is provided, and a plurality of battery packs are connected to form a parallel circuit structure through a bus line. The inverter is connected to the first bus line and the second bus line respectively to convert the collected DC power into AC power.
This simplifies wiring complexity, reduces cost and power loss, avoids the need to configure separate inverters for different battery layers, and further reduces costs.
Smart Images
Figure CN222674265U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of photovoltaic cells, and in particular to a wiring device. Background Art
[0002] Photovoltaic modules can be divided into two types: single junction and laminated. Among them, laminated photovoltaic modules can improve the spectral utilization rate through the laminated structure of different photovoltaic materials, thereby improving the photoelectric conversion efficiency. However, the multiple circuits of laminated photovoltaic modules need to match multiple inverters, and the current of each circuit is small, which has low utilization rate of the inverter, complex wiring system, and increased production cost, which affects its promotion and application.
[0003] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content
[0004] The embodiments of the present application provide a wiring device to solve or alleviate one or more of the technical problems mentioned above.
[0005] As one aspect of an embodiment of the present application, an embodiment of the present application provides a wiring device, the wiring device is used to electrically connect an inverter and a laminated photovoltaic module, the laminated photovoltaic module includes a first battery layer and a second battery layer, wherein the first battery layer includes a plurality of first battery groups, and the second battery layer includes a plurality of second battery groups, the wiring device includes:
[0006] A bus bar, including a first bus bar and a second bus bar;
[0007] The first bus bar is connected to the plurality of first battery groups and is used to collect the direct current of the first battery layer; the second bus bar is connected to the plurality of second battery groups and is used to collect the direct current of the second battery layer;
[0008] The first bus bar is connected to the inverter, and the second bus bar is connected to the inverter, so as to convert the collected direct current into alternating current through the inverter.
[0009] Optionally, the first bus bar is connected to a first power tracking point of the inverter, and the second bus bar is connected to a second power tracking point of the inverter, so that the inverter converts the collected direct current into alternating current via the first power tracking point and the second power tracking point.
[0010] Optionally, the first battery group includes a plurality of first batteries connected in series, wherein the first batteries include crystalline silicon batteries; and the second battery group includes a plurality of second batteries connected in series, wherein the second batteries include perovskite batteries.
[0011] Optionally, the sum of the voltages of the first battery groups is the same, and the sum of the voltages of the second battery groups is the same.
[0012] Optionally, the first bus bar and the second bus bar each include: a main bus bar, a branch wire and a connector, wherein the connector is used to connect the main bus bar and the branch wire together;
[0013] Wherein, the connector includes a T-type connector and / or a Y-type connector.
[0014] Optionally, the main conductor includes a first main conductor and a second main conductor;
[0015] The branch wires include a plurality of first branch wires and a plurality of second branch wires;
[0016] Among them, the multiple first branch wires are connected on one side of the first main wire in an interval manner, and the multiple second branch wires are connected on one side of the second main wire in an interval manner, and the positions of the multiple first branch wires on the first main wire correspond one-to-one to the positions of the multiple second branch wires on the second main wire.
[0017] Optionally, the bus bar further comprises a first wiring port, and the first wiring port is used to connect a battery pack;
[0018] The first connection port includes a port of a first branch conductor and a port of a second branch conductor which are located correspondingly.
[0019] Optionally, the busbar further includes a second wiring port, and the second wiring port is used to connect the inverter;
[0020] The second connection port includes a port of the first main conductor and a port of the second main conductor.
[0021] Optionally, a difference between the direct current collected in the first battery layer and the direct current collected in the second battery layer is within a preset range.
[0022] Optionally, the laminated photovoltaic module further comprises:
[0023] substrate;
[0024] A first packaging layer is provided on one side of the substrate, and the first battery layer is provided on a side of the first packaging layer away from the substrate;
[0025] A second packaging layer is provided on a side of the first battery layer away from the first packaging layer;
[0026] A second battery layer, disposed on a side of the second packaging layer away from the first battery layer;
[0027] The cover plate is arranged on a side of the second battery layer away from the second packaging layer.
[0028] The above technical solution adopted in the embodiment of the present application may have the following advantages:
[0029] The busbar connects multiple battery packs to form a parallel circuit structure, which can increase the component current without exceeding the maximum input voltage of the inverter and reduce the use of DC cables, which can effectively simplify the wiring complexity, reduce costs and power losses. Among them, the first busbar connects multiple first battery packs of the first battery layer to collect the DC power of the first battery layer. The second busbar connects multiple second battery packs of the second battery layer to collect the DC power of the second battery layer. The inverter is connected to the first busbar and the second busbar respectively to convert the collected DC power into AC power. That is, the inverter can be connected to the first battery layer and the second battery layer at the same time, simplifying the complexity of the system, avoiding the configuration of separate inverters for different battery layers, and further reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.
[0031] Figure 1 It is a schematic diagram of the structure of the bus bar provided in an embodiment of the present application.
[0032] Figure 2 It is a schematic diagram of the structure of the connector provided in an embodiment of the present application.
[0033] Figure 3 It is a schematic diagram of a wiring device provided in an embodiment of the present application.
[0034] Description of reference numerals:
[0035] 1 Busbar
[0036] 2 Inverter
[0037] 3. First busbar
[0038] 4 Second busbar
[0039] 5 First connection port
[0040] 6 Second connection port
[0041] 11 Main lines
[0042] 12 Branch wire
[0043] 13 Connectors
[0044] 111 First Main Line
[0045] 112 Second main line
[0046] 121 First Branch Line
[0047] 122 Second Branch Line DETAILED DESCRIPTION
[0048] In order to make the purpose, technical solution and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0050] The following provides an explanation of the terms used in this application.
[0051] MPPT (Maximum Power Point Tracking): In a photovoltaic system, it can be used to adjust the voltage and current output by the photovoltaic module to match the input requirements of the inverter.
[0052] The embodiment of the present application provides a wiring device. In the wiring device: (1) the current of a single string of components can be increased by a DC busbar, reducing the use of DC cables, effectively simplifying the wiring complexity, and reducing costs and energy losses. (2) The wiring device can realize the inverter to connect the crystalline silicon string (first battery layer) and the perovskite string (second battery layer) at the same time, effectively simplifying the system complexity and alleviating the cost increase caused by using separate inverters for crystalline silicon and perovskite. See below for details.
[0053] Hereinafter, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be noted that these exemplary embodiments can be implemented in many different forms and should not be construed as being limited to the embodiments described herein.
[0054] The embodiment of the present application provides a wiring device that can be used to electrically connect an inverter and a laminated photovoltaic module. The laminated photovoltaic module can be a two-terminal laminated photovoltaic module, a three-terminal laminated photovoltaic module, a four-terminal laminated photovoltaic module, etc. Take a four-terminal laminated photovoltaic module as an example below. The four-terminal laminated photovoltaic module may include a first battery layer and a second battery layer, wherein the first battery layer may include a plurality of first battery groups, and the second battery layer may include a plurality of second battery groups.
[0055] like Figures 1 to 3 As shown, the wiring device may include: a busbar 1. The busbar 1 may be used to electrically connect the inverter 2 and the laminated photovoltaic module.
[0056] The following introduces the structures and coordination relationships of the busbar 1, inverter 2, and laminated photovoltaic modules.
[0057] The busbar 1 may include a first busbar 3 and a second busbar 4. The first busbar 3 may be connected to a plurality of first battery packs to collect direct current of the first battery layer. The second busbar 4 may be connected to a plurality of second battery packs to collect direct current of the second battery layer.
[0058] The first bus bar 3 can be connected to the inverter 2, and the second bus bar 4 can be connected to the inverter 2 to convert the collected DC power into AC power through the inverter 2. In some embodiments, the inverter 2 can be configured with a maximum power tracking point MPPT, which can be used to adjust the input current / voltage to meet the input requirements of the inverter. The first bus bar 3 and the second bus bar 4 are connected to the MPPT point so that the inverter 2 converts the DC power into AC power via the MPPT point.
[0059] In this embodiment, the busbars connect multiple battery packs to form a parallel circuit structure, which can increase the component current without exceeding the maximum input voltage of the inverter and reduce the use of DC cables, which can effectively simplify the wiring complexity, reduce costs and power losses. The inverter can be connected to the first battery layer and the second battery layer at the same time by connecting to the first busbar and the second busbar, simplifying the system complexity, avoiding the configuration of separate inverters for different battery layers, and further reducing costs.
[0060] The following is a further exemplary introduction to the laminated photovoltaic modules, busbars, and inverters.
[0061] In an optional embodiment, the inverter 2 may include a first power tracking point and a second power tracking point (MPPT) that are independent of each other. The first power tracking point may be connected to the first bus bar 3 to adjust the current (DC) collected at the first battery layer to match the input requirements of the inverter. The second power tracking point may be connected to the second bus bar 4 to adjust the current (DC) collected at the second battery layer to match the input requirements of the inverter. The input requirements may include a maximum input voltage (such as 1100V), a maximum input current (such as 30A), matching component voltage and current, etc.
[0062] In this embodiment, independent MPPT points are configured for different bus bars (different battery layers), which can effectively alleviate the problem of internal mismatch and overall efficiency reduction caused by the barrel effect in the parallel circuit structure.
[0063] In an optional embodiment, the first battery group may include a plurality of first batteries connected in series to form a series circuit structure. The second battery group may include a plurality of second batteries connected in series to form a series circuit structure. Exemplarily, the laminated photovoltaic module may be a crystalline silicon-perovskite laminated battery. Accordingly, the first battery may be a crystalline silicon battery, and the first battery layer is a crystalline silicon battery layer. The second battery may be a perovskite battery, and the second battery layer is a perovskite battery layer.
[0064] In this embodiment, the crystalline silicon-perovskite stacked structure (wide bandgap + narrow bandgap combination) can improve the spectral utilization (near ultraviolet band), and can also reduce the out-of-band absorption and thermal relaxation of crystalline silicon cells, thereby reducing costs and increasing efficiency, and greatly improving the photoelectric conversion efficiency.
[0065] In an optional embodiment, the sum of the voltages of the first battery groups is the same, and the sum of the voltages of the second battery groups is the same.
[0066] In this embodiment, the total voltage of each battery pack is the same, which can ensure that the parallel voltage of the parallel circuit structure formed by connecting each battery pack to the bus bar is consistent, avoiding voltage mismatch caused by voltage inconsistency, thereby causing a decrease in system power generation efficiency.
[0067] In an optional embodiment, the first bus bar 3 and the second bus bar 4 may have the same structure, and both may include a main conductor 11, a branch conductor 12 and a connector 13. Figure 1 As shown, the connector 13 can be used to connect the main conductor 11 and the branch conductor 12 together. Figure 2 As shown, the connector 13 may include a T-type connector and / or a Y-type connector.
[0068] In this embodiment, connectors 13 of different structures can provide a more flexible connection method, meet different wiring requirements, reduce the complexity of the wiring system, and improve the overall reliability of the system.
[0069] The structure of the bus bar 1 is exemplarily introduced below.
[0070] In an optional embodiment, if Figure 1 As shown, the main conductor 11 may include a first main conductor 111 and a second main conductor 112. The branch conductor 12 may include a plurality of first branch conductors 121 and a plurality of second branch conductors 122. The plurality of first branch conductors 121 may be connected to one side of the first main conductor 111 at intervals, and the plurality of second branch conductors 122 may be connected to one side of the second main conductor 112 at intervals. The positions of the plurality of first branch conductors 121 on the first main conductor 111 may correspond one to one with the positions of the plurality of second branch conductors 122 on the second main conductor 112.
[0071] In this embodiment, the reliability, stability and flexibility of the wiring system can be improved by using the symmetrically designed busbars.
[0072] In an optional embodiment, the busbar 1 further includes a first wiring port 5. The first wiring port 5 can be used to connect the battery pack to collect the current generated by the battery pack. The first wiring port 5 can include a port of the first branch wire 121 and a port of the second branch wire 122 at corresponding positions.
[0073] In this embodiment, the port of the first branch conductor 121 and the port of the second branch conductor 122 corresponding to the position in the bus 1 can be combined to obtain a first wiring port 5, and the first wiring port 5 can be used to connect the two poles of any first battery group or second battery group to collect the corresponding direct current. Based on the one-to-one correspondence between the positions of the multiple first branch conductors 121 on the first main conductor 111 and the positions of the multiple second branch conductors 122 on the second main conductor 112, the bus 1 can form multiple first wiring ports 5 for connecting multiple first battery groups of the first battery layer or multiple second battery groups of the second battery layer to collect the current of the first battery layer or the second battery layer. Through the bus 1, multiple groups of batteries (multiple battery groups) connected in series can be connected in parallel, the component current can be increased without exceeding the maximum input voltage of the inverter, and the use of DC cables can be reduced, which can effectively reduce costs and power losses.
[0074] In an optional embodiment, the busbar 1 may further include a second wiring port 6. The second wiring port 6 may be used to connect to an inverter. The second wiring port 6 may include a port of the first main conductor 111 and a port of the second main conductor 112. In some embodiments, the second wiring port 6 may also be a combination of a port of the first branch conductor 121 and a port of the second branch conductor 122 corresponding to any position. Figure 1 As shown, the exemplary bus bar includes six groups of wiring ports, any one of which can be selected as the second wiring port 6 , and the remaining wiring ports can be the first wiring port 5 .
[0075] In this embodiment, by configuring the second wiring port 6, a more flexible wiring method can be provided, the system reliability can be improved, and the complexity can be reduced.
[0076] In an optional embodiment, a difference between the direct current collected from the first battery layer and the direct current collected from the second battery layer is within a preset range.
[0077] Exemplarily, the first bus bar 3 can be connected to the first power tracking point of the inverter when the bus bar (the DC power of the first battery layer) reaches 15 to 20A. The second bus bar 4 can be connected to the second power tracking point of the inverter when the bus bar (the DC power of the second battery layer) reaches 15 to 20A. In this embodiment, when the DC power difference is within a preset range (for example, 0 to 5A), the current and voltage can be matched to the requirements of the inverter through the adjustment function of the MPPT, so that the inverter can connect different battery layers through the bus bar, simplify the wiring system, and reduce production costs.
[0078] In an optional embodiment, the laminated photovoltaic module may further include a substrate, a first encapsulation layer, a second encapsulation layer and a cover plate.
[0079] The structure and coordination of each layer will be introduced below.
[0080] The substrate can be transparent glass or a flexible substrate, which can be used to support and protect the photovoltaic module.
[0081] The first encapsulation layer may include an adhesive film and may be disposed on one side of the substrate, and the first battery layer may be disposed on a side of the first encapsulation layer away from the substrate. In the crystalline silicon-perovskite stacked battery, the first battery layer may be a crystalline silicon battery layer.
[0082] The second encapsulation layer may include an adhesive film and may be disposed on a side of the first battery layer away from the first encapsulation layer. The second battery layer is disposed on a side of the second encapsulation layer away from the first battery layer. In the crystalline silicon-perovskite stacked battery, the first battery layer may be a perovskite battery layer.
[0083] The cover plate may be a transparent glass, and may be disposed on a side of the second battery layer away from the second packaging layer.
[0084] In this embodiment, the photovoltaic module can improve the spectral utilization (near ultraviolet band) through the stacked structure (wide bandgap + narrow bandgap combination), and can also reduce out-of-band absorption and thermal relaxation, reduce costs and increase efficiency, and greatly improve the photoelectric conversion efficiency.
[0085] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0086] For the convenience of description, the orientation or position relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, vertical, horizontal" and "top, bottom" is usually based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these directional words 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 cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Therefore, the exemplary term "above..." can include both "above..." and "below..." orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here are interpreted accordingly.
[0087] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0088] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.
[0089] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0090] It should also be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.
[0091] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0092] It should also be noted that the above are only preferred embodiments of the present application, and the patent protection scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A wiring device, characterized in that: The wiring device is used to electrically connect an inverter and a laminated photovoltaic module, wherein the laminated photovoltaic module includes a first battery layer and a second battery layer, wherein the first battery layer includes a plurality of first battery groups, and the second battery layer includes a plurality of second battery groups, and the wiring device includes: A bus bar, including a first bus bar and a second bus bar; The first bus bar is connected to the plurality of first battery groups and is used to collect the direct current of the first battery layer; the second bus bar is connected to the plurality of second battery groups and is used to collect the direct current of the second battery layer; The first bus bar is connected to the inverter, and the second bus bar is connected to the inverter, so as to convert the collected direct current into alternating current through the inverter.
2. The wiring device according to claim 1, characterized in that: The first bus bar is connected to a first power tracking point of the inverter, and the second bus bar is connected to a second power tracking point of the inverter, so that the inverter converts the collected direct current into alternating current via the first power tracking point and the second power tracking point.
3. The wiring device according to claim 1, characterized in that: The first battery group includes a plurality of first batteries connected in series, wherein the first batteries include crystalline silicon batteries; The second battery group includes a plurality of second batteries connected in series, and the second batteries include perovskite batteries.
4. The wiring device according to claim 1, characterized in that: The sum of the voltages of the first battery groups is the same, and the sum of the voltages of the second battery groups is the same.
5. The wiring device according to claim 1, characterized in that: The first bus bar and the second bus bar both include: A main conductor, a branch conductor and a connector, wherein the connector is used to connect the main conductor and the branch conductor together; Wherein, the connector includes a T-type connector and / or a Y-type connector.
6. The wiring device according to claim 5, characterized in that: The main conductor includes a first main conductor and a second main conductor; The branch wires include a plurality of first branch wires and a plurality of second branch wires; Among them, the multiple first branch wires are connected on one side of the first main wire in an interval manner, and the multiple second branch wires are connected on one side of the second main wire in an interval manner, and the positions of the multiple first branch wires on the first main wire correspond one-to-one to the positions of the multiple second branch wires on the second main wire.
7. The wiring device according to claim 6, characterized in that: The bus bar further comprises a first connection port, wherein the first connection port is used to connect a battery pack; The first connection port includes a port of a first branch conductor and a port of a second branch conductor which are located correspondingly.
8. The wiring device according to claim 5, characterized in that: The busbar further includes a second wiring port, and the second wiring port is used to connect the inverter; The second connection port includes a port of the first main conductor and a port of the second main conductor.
9. The wiring device according to any one of claims 1 to 8, characterized in that: A difference between the direct current collected from the first battery layer and the direct current collected from the second battery layer is within a preset range.
10. The wiring device according to any one of claims 1 to 8, characterized in that: The laminated photovoltaic module also includes: substrate; A first packaging layer is provided on one side of the substrate, and the first battery layer is provided on a side of the first packaging layer away from the substrate; A second packaging layer is provided on a side of the first battery layer away from the first packaging layer; A second battery layer, disposed on a side of the second packaging layer away from the first battery layer; The cover plate is arranged on a side of the second battery layer away from the second packaging layer.