Matrix lamination photovoltaic device

Abstract

The invention provides a matrix lamination photovoltaic device, and relates to the field of photovoltaic technology, the matrix lamination photovoltaic device comprises a plurality of battery pieces, in a first direction, the first connection parts of the adjacent battery pieces are overlapped, and the first connection parts are connected through connecting pieces; in the second direction, the second connecting parts of the adjacent battery pieces are overlapped, and the second connecting parts are connected through connecting pieces; current can flow on the battery pieces in the first direction and can also flow in the second direction, and the battery pieces are connected in a net-shaped series-parallel circuit connection mode. The battery pieces are overlapped in a staggered arrangement mode, a net-shaped circuit structure is achieved, the situation that the generating capacity of the fault battery pieces is reduced is avoided, and the generating efficiency of the photovoltaic device is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a matrix laminated photovoltaic device. Background Art

[0002] Conventional photovoltaic cells have many fine grids printed on the front and back, which are used to collect the current generated by light. In addition, conventional photovoltaic cells also have several main grids, which are arranged to intersect the fine grids perpendicularly to collect the current on each fine grid.

[0003] However, when some solar cells are blocked or have hidden cracks, the current in the module will be blocked by the faulty solar cells, resulting in reduced power generation efficiency. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the first objective of the present application is to provide a matrix stacked photovoltaic device.

[0006] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a matrix laminated photovoltaic device, comprising: a plurality of solar cells, wherein first connection parts of adjacent solar cells are overlapped in a first direction, and the first connection parts are connected by a connector;

[0007] In the second direction, the second connection parts of the adjacent battery cells are overlapped and placed, and the second connection parts are connected by a connecting member;

[0008] The current can flow in the first direction or in the second direction on the battery cells, and the battery cells are connected in a mesh hybrid circuit.

[0009] Optionally, the connecting member includes at least one of the following: conductive adhesive, soldering tape.

[0010] Optionally, the first connection portion is located at two boundaries of the battery cell in the first direction, and the second connection portion is located at two boundaries of the battery cell in the second direction.

[0011] Optionally, the battery cells in the first direction are connected in series, and the battery cells in the second direction are connected in parallel, and the current in all the battery cells in the device is output from the last battery cell.

[0012] Optionally, when some of the battery cells fail, the current blocked by the failed battery cells will flow through the parallel node to the adjacent non-faulty battery cells and continue to be transmitted.

[0013] Optionally, after the battery cells are overlapped, the overall shape of the device is a plane or a curved surface.

[0014] The matrix stacked photovoltaic device provided in the present application realizes a mesh circuit structure by overlapping and placing the cells in a staggered arrangement, thereby avoiding the reduction of power generation due to faulty cells and improving the power generation efficiency of the photovoltaic device.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 A schematic structural diagram of a matrix laminated photovoltaic device provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of a circuit in a matrix laminated photovoltaic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0020] Conventional photovoltaic cells (hereinafter referred to as cells) have many fine grids printed on the front and back, which are used to collect the current generated by light. In addition, conventional photovoltaic cells also have N main grids, which are arranged to intersect the fine grids perpendicularly to collect the current on each fine grid.

[0021] With the further advancement of cost reduction and efficiency improvement in the photovoltaic industry, the graphic design on the surface of the battery has gradually reduced the existing main grid area and reduced the silver consumption, and the busbar-free battery technology has begun to appear. Busbar-free battery technology generally refers to removing the main grid and retaining only the fine grid on the basis of conventional battery cells; this type of battery cell has no main grid, which can greatly reduce the amount of silver paste required for printing the main grid and reduce costs; on the other hand, since there is no main grid to block the light on the surface of the battery cell, it can also increase the effective illumination area of ​​the battery cell and increase power generation.

[0022] In the prior art, ordinary round wire welding strips are used to weld with fine grids at a certain temperature. The welding strips not only connect two adjacent battery cells in series, but also collect the current in the fine grids. When welding, UV curing glue is usually used to improve the bonding strength between the welding strips and the battery cells. However, since the welding strips are raised by the curing glue, they cannot form a good bond with the fine grids, resulting in poor ohmic contact between the welding strips and the battery cells, affecting the transmission and reliability of electrical performance between the battery cells and the welding strips. At the same time, in the subsequent packaging lamination process, in order to prevent the adhesive film from flowing between the welding strips and the fine grids to affect the ohmic contact, it is necessary to use an adhesive film with poor fluidity for packaging, resulting in a higher temperature required for packaging, which may affect the performance of the battery cells themselves. In addition, there are few types of adhesive films suitable for packaging, and it takes a long time for the adhesive film to cover the battery cells to complete the lamination packaging process, and the production efficiency is low, which cannot meet the needs of mass production in the short term.

[0023] To address this problem, the present application provides a matrix laminated photovoltaic device. Figure 1 This is a schematic diagram of the structure of a matrix laminated photovoltaic device provided in an embodiment of the present application. Figure 1 As shown, the device comprises:

[0024] A plurality of battery cells, in a first direction, first connection parts of adjacent battery cells are overlapped and placed, and the first connection parts are connected by a connecting member;

[0025] In the second direction, the second connection parts of the adjacent battery cells are overlapped and placed, and the second connection parts are connected by a connecting member;

[0026] The current can flow in the first direction or in the second direction on the battery cells, and the battery cells are connected in a mesh hybrid circuit.

[0027] In this embodiment, the cells are arranged in a staggered manner, realizing a matrix arrangement of cells in which the cells are connected in series vertically and in parallel horizontally. This unique cell arrangement structure enables the matrix laminated photovoltaic module to have a series of unique technical features and advantages.

[0028] Optionally, the connecting member includes at least one of the following: conductive adhesive, soldering tape.

[0029] The cells in the matrix stacked modules are connected by stacking and conductive adhesive, and there are no gaps or solder strips between the cells. Therefore, under the conditions of using the same silicon wafers, the same cell efficiency and the same power, the module area utilization rate and module efficiency are the highest. At the same time, from the appearance point of view, conventional full-cell / half-cell modules and shingled modules have obvious light-colored gaps between silicon wafers and solder strips, while the overall appearance of the matrix stacked modules is black.

[0030] Optionally, the first connection portion is located at two boundaries of the battery cell in the first direction, and the second connection portion is located at two boundaries of the battery cell in the second direction.

[0031] Optionally, the battery cells in the first direction are connected in series, and the battery cells in the second direction are connected in parallel, and the current in all the battery cells in the device is output from the last battery cell.

[0032] Optionally, when some of the battery cells fail, the current blocked by the failed battery cells will flow through the parallel node to the adjacent non-faulty battery cells and continue to be transmitted.

[0033] Figure 2 A schematic diagram of a circuit in a matrix laminated photovoltaic device provided in an embodiment of the present application, such as Figure 2 As shown, in the conventional battery cell connection method, when some battery cells are blocked or have hidden cracks, the current in the component will be blocked by the faulty battery cells, resulting in reduced power generation efficiency.

[0034] The matrix stacked cells are arranged in a matrix manner with vertical series connection and horizontal parallel connection. The circuit formed is a grid. When some cells are blocked or defective, the current blocked by the faulty cell in the component will flow through the parallel node to the adjacent non-faulty cell and continue to be transmitted, thereby limiting the loss of the faulty cell to a smaller range near the faulty cell.

[0035] Optionally, after the battery cells are overlapped, the overall shape of the device is a plane or a curved surface.

[0036] The matrix stacking module has achieved a major change in the battery arrangement by staggering the battery cells. The battery array is arranged longitudinally in an imbricate manner, and the adjacent battery cells are staggered and stacked, so that a mesh hybrid circuit connection method is formed between the double-sided battery cells, that is, the battery cells are connected in series longitudinally and in parallel transversely, realizing the vertical and horizontal two-dimensional flow of current in the module. When some battery cells are blocked or have hidden cracks, the current blocked by the faulty battery cell (caused by blocking or hidden cracks) in the module will flow around to the adjacent non-faulty battery cell through the parallel node for continued transmission, thereby limiting the loss of the faulty battery cell to a smaller range near the faulty battery cell. Therefore, the tolerance of the module to the inconsistency of internal battery cells is greatly improved, which significantly reduces the power loss caused by electrical performance mismatch and achieves the highest power generation throughout the life cycle. The shielding test results of a third-party testing agency have proved that under different shielding conditions, the output power of the matrix stacked module is 39% higher than that of the conventional stacked module on average; the hot spot test results show that the maximum hot spot temperature of the matrix stacked module is 95°C (other modules are 120°C or even above 200°C), and the front power is reduced by 0.55% and the back power is increased by 0.29% after the hot spot test (IEC61215 requires the power reduction to be no more than 5%). The results clearly show that the layout design of the matrix stack enables the current to bypass the shielded and faulty areas, effectively reducing local current losses. In addition, the reverse high current (27A) test conducted showed that the module did not have abnormally high temperature and damage, and the power did not attenuate. The thermal cycle (TC200) test showed that the power of the front side of the module decreased by 0.76% (IEC61215 requires the power reduction to be no more than 5%). The potential induced degradation (PID) test showed that the PID rate of the module was 2.2-2.46%, which is better than the international standard requirement of 5%. The results of related tests such as the damp heat test, the humidity and freeze test, and the static load test are also far better than the IEC standard requirements.

[0037] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0038] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0039] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0040] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0043] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0044] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0045] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0046] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0047] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A matrix laminated photovoltaic device, characterized in that: include: A plurality of battery cells, in a first direction, first connection parts of adjacent battery cells are overlapped and placed, and the first connection parts are connected by a connecting member; In the second direction, the second connection parts of the adjacent battery cells are overlapped and placed, and the second connection parts are connected by a connecting member; The current can flow in the first direction or in the second direction on the battery cells, and the battery cells are connected in a mesh hybrid circuit.

2. The device according to claim 1, characterized in that The connecting piece includes at least one of the following: conductive glue and soldering tape.

3. The device according to claim 1, characterized in that The first connection parts are located at two boundaries of the battery cell in the first direction, and the second connection parts are located at two boundaries of the battery cell in the second direction.

4. The device according to claim 1, characterized in that The battery cells in the first direction are connected in series, the battery cells in the second direction are connected in parallel, and the current in all the battery cells in the device is output from the last battery cell.

5. The device according to claim 1, characterized in that When some of the battery cells fail, the current blocked by the failed battery cells will flow through the parallel nodes to the adjacent non-faulty battery cells for continued transmission.

6. The device according to claim 1, characterized in that After the battery cells are overlapped, the overall shape of the device is a plane or a curved surface.

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