System and method for predicting power difference of photovoltaic cell assembly

Abstract

The invention discloses a system and method for predicting the power difference of a photovoltaic cell assembly, and the system comprises an obtaining module, a calculation module and a prediction module, the obtaining module is used for obtaining a first assembly parameter of the photovoltaic cell assembly when an auxiliary main grid is configured and a second assembly parameter of the photovoltaic cell assembly when the auxiliary main grid is not configured; the calculation module is used for calculating the first power loss of the photovoltaic cell assembly when the auxiliary main grid is configured according to the first assembly parameter and calculating the second power loss of the photovoltaic cell assembly when the auxiliary main grid is not configured; the prediction module is used for predicting the power difference of the photovoltaic cell assembly according to the first power loss and the second power loss, thereby achieving the precise prediction of the difference between the power of the photovoltaic cell assembly which is not provided with the auxiliary main grid and the power of the photovoltaic cell assembly which is provided with the auxiliary main grid. And further determining the change condition of the power of the photovoltaic cell assembly without the auxiliary main grid relative to the power of the photovoltaic cell assembly with the auxiliary main grid.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cells, and in particular to a system and method for predicting power differences of photovoltaic cell modules. Background Art

[0002] With the advancement of photovoltaic cell module technology, high-power cell modules are playing a vital role in the development of the photovoltaic field. Factors affecting the power of the cell module include the cell's own photoelectric conversion efficiency, thermal power losses from the grid lines and ribbons, and secondary light utilization. While the cell's own photoelectric conversion efficiency is difficult to change, thermal power losses from the grid lines and ribbons, as well as secondary light utilization, can be optimized and improved at the module end. Thermal power losses from the grid lines and ribbons have a greater impact on the cell module end. This is due to the high auxiliary busbar resistance of the cell, which results in a higher thermal power of the current passing through it.

[0003] To address this issue, busbar-less solar cells were developed. These cells completely eliminate the auxiliary busbar, eliminating the heat generated by larger resistors and reducing power losses during current collection, thereby increasing the power of both cells and modules. Conventional solar cell-side photovoltaic current collection uses auxiliary busbars, secondary grids, and solder ribbons to collect the current per unit area. However, busbar-less solar current collection allows the current to flow entirely through the secondary grid and into the solder ribbons, changing the current collection path. This also alters the heat loss caused by the grid lines passing current, resulting in changes in module power.

[0004] However, after the development of busbarless battery technology, it has been impossible to predict the power difference between busbarless batteries and busbar-equipped modules and batteries, or the power loss of the auxiliary busbar, sub-grid, and welding ribbons in each half-cell. As a result, it is impossible to predict whether the power of the busbarless battery module itself can be increased, and by how much, as the heat loss power of the busbar-equipped module changes with different numbers of auxiliary busbars, sub-grids, and welding ribbons compared to the heat loss power of the busbarless module. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a system for predicting the power difference of photovoltaic cell modules. The system can accurately predict the difference in power between photovoltaic cell modules without auxiliary busbars and photovoltaic cell modules with auxiliary busbars, and further determine the change in power of photovoltaic cell modules without auxiliary busbars relative to the power of photovoltaic cell modules with auxiliary busbars.

[0006] Therefore, a second object of the present invention is to provide a method for predicting power differences of photovoltaic cell modules.

[0007] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention discloses a system for predicting the power difference of a photovoltaic cell assembly, comprising: an acquisition module for acquiring a first assembly parameter of the photovoltaic cell assembly when an auxiliary main grid is configured and a second assembly parameter when an auxiliary main grid is not configured; a calculation module for calculating a first power loss of the photovoltaic cell assembly when an auxiliary main grid is configured based on the first assembly parameter, and calculating a second power loss of the photovoltaic cell assembly when an auxiliary main grid is not configured; and a prediction module for predicting the power difference of the photovoltaic cell assembly based on the first power loss and the second power loss.

[0008] According to the system for predicting the power difference of photovoltaic cell assemblies in accordance with an embodiment of the present invention, the power loss of the two photovoltaic cell assemblies can be calculated respectively by obtaining the first assembly parameters of the photovoltaic cell assembly when the auxiliary main grid is configured and the second assembly parameters when the auxiliary main grid is not configured, and the power difference of the two photovoltaic cell assemblies is predicted based on the power loss, thereby achieving an accurate prediction of the difference in power between the photovoltaic cell assembly without the auxiliary main grid and the photovoltaic cell assembly with the auxiliary main grid, and then determining the change in power of the photovoltaic cell assembly without the auxiliary main grid relative to the power of the photovoltaic cell assembly with the auxiliary main grid.

[0009] In addition, the system for predicting power differences of photovoltaic cell assemblies according to the above embodiment of the present invention may also have the following additional technical features:

[0010] In some examples, the first component parameters include: the elementary resistance of the welding ribbon on the front side of the photovoltaic cell component, the elementary resistance of the auxiliary main grid on the front side of the photovoltaic cell component, the number of auxiliary grids between two PAD points on the front side of the photovoltaic cell component, the elementary current density on the front side of the photovoltaic cell component, the number of PAD points on the front side of the photovoltaic cell component, the elementary resistance of the welding ribbon on the back side of the photovoltaic cell component, the elementary resistance of the auxiliary main grid on the back side of the photovoltaic cell component, the number of auxiliary grids between two PAD points on the back side of the photovoltaic cell component, the elementary current density on the back side of the photovoltaic cell component, and the number of PAD points on the back side of the photovoltaic cell component.

[0011] In some examples, when the calculation module calculates the first power loss of the photovoltaic cell assembly when the auxiliary main grid is configured according to the first component parameters, it is specifically used to: calculate the front solder ribbon loss power, the front auxiliary main grid loss power, the back solder ribbon loss power and the back auxiliary main grid loss power of the photovoltaic cell assembly according to the first component parameters; and calculate the first power loss according to the sum of the front solder ribbon loss power, the front auxiliary main grid loss power, the back solder ribbon loss power and the back auxiliary main grid loss power.

[0012] In some examples, the calculation module is used to calculate the front ribbon loss power, the front auxiliary main grid loss power, the back ribbon loss power, and the back auxiliary main grid loss power of the photovoltaic cell assembly using the following formula:

[0013]

[0014]

[0015]

[0016]

[0017] Among them, P fr_rib1 is the power loss of the front welding strip, a1 is the number of auxiliary grids between the two PAD points on the front of the photovoltaic cell module, a1 / / 2 means a1 is divided by 2 and rounded up, I base1 is the elementary current density on the front of the photovoltaic cell assembly, k1 is the number of PAD points on the front of the photovoltaic cell assembly, R fr_rib1 is the elementary resistance of the soldering tape on the front of the photovoltaic cell assembly, P fr_bus1 is the front auxiliary main grid power loss, R fr_bus1 is the elementary resistance of the auxiliary main grid on the front side of the photovoltaic cell assembly, P fr_rib2 is the power loss of the back welding strip, a2 is the number of auxiliary grids between the two PAD points on the back of the photovoltaic cell assembly, I base2 is the cell current density on the back of the photovoltaic cell assembly, k2 is the number of PAD points on the back of the photovoltaic cell assembly, R fr_rib2 is the elementary resistance of the soldering tape on the back of the photovoltaic cell assembly, P fr_bus2 is the back auxiliary main grid power loss, R fr_bus2 is the elementary resistance of the auxiliary main grid on the back of the photovoltaic cell assembly.

[0018] In some examples, the second component parameters include: the elementary resistance of the welding ribbon on the front side of the photovoltaic cell component, the elementary current density on the front side of the photovoltaic cell component, the number of intersections between the auxiliary grid and the welding ribbon on the front side of the photovoltaic cell component, the elementary resistance of the welding ribbon on the back side of the photovoltaic cell component, the elementary current density on the back side of the photovoltaic cell component, and the number of intersections between the auxiliary grid and the welding ribbon on the back side of the photovoltaic cell component.

[0019] In some examples, when the calculation module calculates the second power loss of the photovoltaic cell assembly when the auxiliary main grid is not configured according to the second component parameters, it is specifically used to: calculate the front solder ribbon loss power and the back solder ribbon loss power of the photovoltaic cell assembly according to the second component parameters; and calculate the second power loss according to the sum of the front solder ribbon loss power and the back solder ribbon loss power.

[0020] In some examples, the calculation module is used to calculate the front-side ribbon loss power and the back-side ribbon loss power of the photovoltaic cell assembly using the following formula:

[0021]

[0022]

[0023] Among them, P fr_rib3 is the front solder strip power loss, I base3 is the elementary current density on the front of the photovoltaic cell assembly, k3 is the number of intersections between the auxiliary grid and the welding strip on the front of the photovoltaic cell assembly, R fr_rib3 is the elementary resistance of the soldering tape on the front of the photovoltaic cell assembly, P fr_rib4 is the back solder strip power loss, I base4 is the cell current density on the back of the photovoltaic cell assembly, k4 is the number of intersections between the auxiliary grid and the welding strip on the back of the photovoltaic cell assembly, R fr_rib4 is the elementary resistance of the welding strip on the back of the photovoltaic cell assembly.

[0024] In some examples, the acquisition module is also used to obtain the number of battery strings in the photovoltaic cell assembly and the number of half-cell batteries in each battery string; the prediction module is specifically used to predict the power difference of the photovoltaic cell assembly through the following formula: power difference = the first power loss * the number of battery strings * the number of half-cell batteries in each battery string - the second power loss * the number of battery strings * the number of half-cell batteries in each battery string.

[0025] In some examples, the system for predicting power differences of photovoltaic cell assemblies further includes an input module configured to provide an input interface for receiving the first assembly parameter and the second assembly parameter input by a user through operation of the input interface.

[0026] To achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention discloses a method for predicting the power difference of a photovoltaic cell assembly, comprising: obtaining a first assembly parameter of the photovoltaic cell assembly when an auxiliary main grid is configured and a second assembly parameter when the auxiliary main grid is not configured; calculating a first power loss of the photovoltaic cell assembly when the auxiliary main grid is configured based on the first assembly parameter, and calculating a second power loss of the photovoltaic cell assembly when the auxiliary main grid is not configured; and predicting the power difference of the photovoltaic cell assembly based on the first power loss and the second power loss.

[0027] According to the method for predicting the power difference of photovoltaic cell assemblies in an embodiment of the present invention, the power loss of the two photovoltaic cell assemblies can be calculated respectively by obtaining the first assembly parameters of the photovoltaic cell assembly when the auxiliary main grid is configured and the second assembly parameters when the auxiliary main grid is not configured, and the power difference of the two photovoltaic cell assemblies is predicted based on the power loss, thereby achieving an accurate prediction of the difference in power between the photovoltaic cell assembly without the auxiliary main grid and the photovoltaic cell assembly with the auxiliary main grid, and then determining the change in power of the photovoltaic cell assembly without the auxiliary main grid relative to the photovoltaic cell assembly with the auxiliary main grid.

[0028] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0030] Figure 1 is a schematic structural diagram of a system for predicting power differences of photovoltaic cell assemblies according to one embodiment of the present invention;

[0031] Figure 2 4 is a flow chart of a method for predicting power differences of photovoltaic cell assemblies according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] System 100 for predicting power difference of photovoltaic cell assembly; acquisition module 110; calculation module 120; prediction module 130. DETAILED DESCRIPTION

[0034] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0035] Reference below Figure 1-Figure 2 A system and method for predicting power differences of photovoltaic cell assemblies according to an embodiment of the present invention are described.

[0036] Figure 1 FIG. 1 is a schematic diagram of a system 100 for predicting power differences of photovoltaic cell modules according to an embodiment of the present invention. Figure 1 As shown, the system includes: an acquisition module 110 , a calculation module 120 and a prediction module 130 .

[0037] The acquisition module 110 is configured to acquire a first component parameter of the photovoltaic cell assembly when the auxiliary busbar is configured and a second component parameter when the auxiliary busbar is not configured.

[0038] Specifically, in the process of predicting the power difference of photovoltaic cell modules, the first module parameters of the photovoltaic cell modules when the auxiliary main grid is configured and the second module parameters when the auxiliary main grid is not configured can be obtained through the acquisition module 110. The acquisition method includes but is not limited to measurement, automatic reading from the production line, or obtaining data from experiments, or direct custom input by the user.

[0039] The calculation module 120 is configured to calculate a first power loss of the photovoltaic cell assembly when the auxiliary busbar is configured according to the first assembly parameter, and to calculate a second power loss of the photovoltaic cell assembly when the auxiliary busbar is not configured.

[0040] Specifically, the calculation module 120 can receive the first component parameters of the photovoltaic cell assembly when the auxiliary busbar is configured and the second component parameters when the auxiliary busbar is not configured, provided by the acquisition module 110, and accurately calculate the first power loss value of the photovoltaic cell assembly when the auxiliary busbar is configured and the second power loss value of the photovoltaic cell assembly when the auxiliary busbar is not configured based on the acquired first component parameters and second component parameters using a preset algorithm and formula. It is understandable that the calculation module 120 can obtain multiple sets of different first component parameters and second component parameters, and calculate the first power loss values of the photovoltaic cell assembly when the auxiliary busbar is configured and the second power loss values of the photovoltaic cell assembly when the auxiliary busbar is not configured based on the different component parameters.

[0041] The prediction module 130 is configured to predict the power difference of the photovoltaic cell assembly according to the first power loss and the second power loss.

[0042] Specifically, the prediction module 130 can predict the power difference of the photovoltaic cell assembly when it is configured with an auxiliary main grid and when it is not configured with an auxiliary main grid under different conditions or parameter changes based on the first power loss data and the second power loss data output by the calculation module 120 by establishing a mathematical model or using a machine learning algorithm or performing statistical analysis, and output the prediction results so that it can be used to understand the performance of the photovoltaic cell assembly under different configurations and make decisions based on the prediction results.

[0043] Therefore, the above-mentioned system 100 for predicting the power difference of photovoltaic cell assemblies can calculate the power loss of the two photovoltaic cell assemblies respectively by obtaining the first component parameters of the photovoltaic cell assembly when the auxiliary main grid is configured and the second component parameters when the auxiliary main grid is not configured, and predict the power difference of the two photovoltaic cell assemblies based on the power loss, thereby realizing the accurate prediction of the difference between the power of the photovoltaic cell assembly without the auxiliary main grid and the power of the photovoltaic cell assembly with the auxiliary main grid, and then determining the change in the power of the photovoltaic cell assembly without the auxiliary main grid relative to the power of the photovoltaic cell assembly with the auxiliary main grid.

[0044] In one embodiment of the present invention, the first component parameters include: the elementary resistance of the welding strip on the front of the photovoltaic cell module, the elementary resistance of the auxiliary main grid on the front of the photovoltaic cell module, the number of sub-grids between the two PAD points on the front of the photovoltaic cell module, the elementary current density on the front of the photovoltaic cell module, the number of PAD points on the front of the photovoltaic cell module, the elementary resistance of the welding strip on the back of the photovoltaic cell module, the elementary resistance of the auxiliary main grid on the back of the photovoltaic cell module, the number of sub-grids between the two PAD points on the back of the photovoltaic cell module, the elementary current density on the back of the photovoltaic cell module, and the number of PAD points on the back of the photovoltaic cell module.

[0045] Specifically, the first component parameters acquired by the acquisition module 110 include the elementary resistance of the welding ribbon on the front of the photovoltaic cell module, the elementary resistance of the auxiliary main grid on the front of the photovoltaic cell module, the number of auxiliary grids between the two PAD points on the front of the photovoltaic cell module, the elementary current density on the front of the photovoltaic cell module, the number of PAD points on the front of the photovoltaic cell module, the elementary resistance of the welding ribbon on the back of the photovoltaic cell module, the elementary resistance of the auxiliary main grid on the back of the photovoltaic cell module, the number of auxiliary grids between the two PAD points on the back of the photovoltaic cell module, the elementary current density on the back of the photovoltaic cell module, and the number of PAD points on the back of the photovoltaic cell module, wherein the PAD point refers to the welding pad or welding point, the elementary resistance of the welding ribbon affects the conduction efficiency of the current on the welding ribbon, the elementary resistance of the auxiliary main grid affects the conduction efficiency of the current on the auxiliary main grid, and thus affects the output power of the photovoltaic cell module, the number of auxiliary grids between the two PAD points affects the distribution and conduction of the current between the PAD points, the elementary current density affects the overall efficiency of the photovoltaic cell module, and the number of PAD points affects the conduction path and efficiency of the current.

[0046] In one embodiment of the present invention, when the calculation module 120 calculates the first power loss of the photovoltaic cell assembly when the auxiliary main grid is configured according to the first component parameters, it is specifically used to: calculate the front solder strip loss power, the front auxiliary main grid loss power, the back solder strip loss power and the back auxiliary main grid loss power of the photovoltaic cell assembly according to the first component parameters; and calculate the first power loss according to the sum of the front solder strip loss power, the front auxiliary main grid loss power, the back solder strip loss power and the back auxiliary main grid loss power.

[0047] Specifically, the calculation module 120 can calculate, based on the received first component parameters, a first power loss of the photovoltaic cell assembly when the auxiliary main grid is configured. Specifically, the front welding ribbon loss power, the front auxiliary main grid loss power, the back welding ribbon loss power, and the back auxiliary main grid loss power can be calculated based on the first component parameters, and the front welding ribbon loss power, the front auxiliary main grid loss power, the back welding ribbon loss power, and the back auxiliary main grid loss power can be added together to obtain the first power loss of the photovoltaic cell assembly.

[0048] In one embodiment of the present invention, the calculation module 120 is used to calculate the front ribbon loss power, front auxiliary busbar loss power, back ribbon loss power and back auxiliary busbar loss power of the photovoltaic cell assembly using the following formula:

[0049]

[0050]

[0051]

[0052]

[0053] Among them, P fr_rib1 is the front welding ribbon power loss, a1 is the number of auxiliary grids between the two PAD points on the front of the photovoltaic cell module, a1 / / 2 means a1 is divided by 2 and rounded up (the symbols appearing in other formulas in this article have the same meaning), I base1 is the elementary current density on the front of the photovoltaic cell module, k1 is the number of PAD points on the front of the photovoltaic cell module, R fr_rib1 is the elementary resistance of the soldering tape on the front of the photovoltaic cell module, P fr_bus1 is the front auxiliary main grid power loss, R fr_bus1 is the elementary resistance of the auxiliary main grid on the front of the photovoltaic cell module, P fr_rib2 is the back welding strip loss power, a2 is the number of auxiliary grids between the two PAD points on the back of the photovoltaic cell module, I base2 is the elementary current density on the back of the photovoltaic cell module, k2 is the number of PAD points on the back of the photovoltaic cell module, R ft_rib2is the elementary resistance of the soldering tape on the back of the photovoltaic cell module, P fr_bus2 is the auxiliary main grid loss power on the back side, R fr_bus2 It is the elementary resistance of the auxiliary main grid on the back of the photovoltaic cell module.

[0054] Specifically, as shown in the above formula, the front welding ribbon loss power can be calculated by the number of auxiliary grids between the two PAD points on the front of the photovoltaic cell module, the elementary current density on the front of the photovoltaic cell module, the number of PAD points on the front of the photovoltaic cell module and the elementary resistance of the welding ribbon on the front of the photovoltaic cell module, which is used to represent the power loss of the welding ribbon on the front of the photovoltaic cell module when conducting current; the front auxiliary main grid loss power can be calculated by the number of auxiliary grids between the two PAD points on the front of the photovoltaic cell module, the elementary current density on the front of the photovoltaic cell module and the elementary resistance of the auxiliary main grid on the front of the photovoltaic cell module, which is used to represent the power loss of the photovoltaic cell module on the front auxiliary main grid. Power loss; similarly, the back ribbon loss power can be calculated from the number of auxiliary grids between the two PAD points on the back of the photovoltaic cell module, the elementary current density on the back of the photovoltaic cell module, the number of PAD points on the back of the photovoltaic cell module, and the elementary resistance of the ribbon on the back of the photovoltaic cell module, which is used to represent the power loss of the back ribbon of the photovoltaic cell module when conducting current; the back auxiliary main grid loss power can be calculated from the number of auxiliary grids between the two PAD points on the back of the photovoltaic cell module, the elementary current density on the back of the photovoltaic cell module, and the elementary resistance of the auxiliary main grid on the back of the photovoltaic cell module, which is used to represent the power loss of the photovoltaic cell module on the back auxiliary main grid.

[0055] In one embodiment of the present invention, the second component parameters include: the elementary resistance of the welding strip on the front of the photovoltaic cell module, the elementary current density on the front of the photovoltaic cell module, the number of intersections between the auxiliary grid and the welding strip on the front of the photovoltaic cell module, the elementary resistance of the welding strip on the back of the photovoltaic cell module, the elementary current density on the back of the photovoltaic cell module, and the number of intersections between the auxiliary grid and the welding strip on the back of the photovoltaic cell module.

[0056] Specifically, the second component parameters acquired by the acquisition module 110 include the elementary resistance of the welding strip on the front of the photovoltaic cell module, the elementary current density on the front of the photovoltaic cell module, the number of intersections between the auxiliary grid and the welding strip on the front of the photovoltaic cell module, the elementary resistance of the welding strip on the back of the photovoltaic cell module, the elementary current density on the back of the photovoltaic cell module, and the number of intersections between the auxiliary grid and the welding strip on the back of the photovoltaic cell module, wherein the elementary resistance of the welding strip affects the conduction efficiency of the current on the welding strip, the elementary current density affects the overall efficiency of the photovoltaic cell module, and the number of intersections between the auxiliary grid and the welding strip affects the distribution and conduction path of the current on the module.

[0057] In one embodiment of the present invention, when the calculation module 120 calculates the second power loss of the photovoltaic cell assembly when the auxiliary main grid is not configured according to the second component parameters, it is specifically used to: calculate the front weld ribbon loss power and the back weld ribbon loss power of the photovoltaic cell assembly according to the second component parameters; and calculate the second power loss according to the sum of the front weld ribbon loss power and the back weld ribbon loss power.

[0058] Specifically, the calculation module 120 can calculate, based on the received second component parameters, a second power loss of the photovoltaic cell assembly when the auxiliary busbar is not configured. Specifically, the front-side welding ribbon power loss and the back-side welding ribbon power loss of the photovoltaic cell assembly can be calculated based on the second component parameters, and the front-side welding ribbon power loss and the back-side welding ribbon power loss can be added together to obtain the second power loss of the photovoltaic cell assembly.

[0059] In one embodiment of the present invention, the calculation module 120 is used to calculate the front-side welding ribbon power loss and the back-side welding ribbon power loss of the photovoltaic cell assembly using the following formula:

[0060]

[0061]

[0062] Among them, P fr_rib3 is the front side welding strip power loss, I base3 is the elementary current density on the front of the photovoltaic cell module, k3 is the number of intersections between the auxiliary grid and the welding strip on the front of the photovoltaic cell module, R fr_rib3 is the elementary resistance of the soldering tape on the front of the photovoltaic cell module, P fr_rib4 is the backside solder strip power loss, I base4 is the elementary current density on the back of the photovoltaic cell module, k4 is the number of intersections between the auxiliary grid and the welding strip on the back of the photovoltaic cell module, R fr_rib4 It is the elementary resistance of the soldering ribbon on the back of the photovoltaic cell module.

[0063] Specifically, as shown in the above formula, the front-side welding ribbon loss power can be calculated by the elementary current density on the front of the photovoltaic cell module, the number of intersections between the auxiliary grid and the welding ribbon on the front of the photovoltaic cell module, and the elementary resistance of the welding ribbon on the front of the photovoltaic cell module, and is used to represent the power loss of the front-side welding ribbon of the photovoltaic cell module when conducting current; similarly, the back-side welding ribbon loss power can be calculated by the elementary current density on the back of the photovoltaic cell module, the number of intersections between the auxiliary grid and the welding ribbon on the back of the photovoltaic cell module, and the elementary resistance of the welding ribbon on the back of the photovoltaic cell module, and is used to represent the power loss of the back-side welding ribbon of the photovoltaic cell module when conducting current.

[0064] In one embodiment of the present invention, the acquisition module 110 is also used to obtain the number of battery strings in the photovoltaic cell assembly and the number of half-cell batteries in each battery string; the prediction module 130 is specifically used to predict the power difference of the photovoltaic cell assembly through the following formula: power difference = first power loss * number of battery strings * number of half-cell batteries in each battery string - second power loss * number of battery strings * number of half-cell batteries in each battery string.

[0065] Specifically, the acquisition module 110 can also obtain the number of battery strings in the photovoltaic cell assembly and the number of half-cell batteries in each battery string. It can be understood that the photovoltaic cell assembly is composed of multiple battery strings, and each battery string contains multiple batteries connected in series, including but not limited to half-cell batteries; further, the prediction module 130 can use the acquired first power loss, second power loss, number of battery strings and number of half-cell batteries in each battery string to predict the power difference of the photovoltaic cell assembly under different conditions. Specifically, the power difference is equal to the difference between the first power loss and the product of the number of battery strings and the number of half-cell batteries in each battery string minus the second power loss and the product of the number of battery strings and the number of half-cell batteries in each battery string.

[0066] In one embodiment of the present invention, the system 100 for predicting power differences of photovoltaic cell assemblies further includes an input module configured to provide an input interface for receiving first and second assembly parameters input by a user through operation of the input interface.

[0067] Specifically, in a system for predicting photovoltaic cell module power differences, the input module can provide users with a simple, intuitive input interface to receive first and second component parameters input by the user through operation of the input interface, thereby initiating the subsequent calculation and prediction process. It is understood that the input interface provided by the input module is typically a graphical user interface, allowing users to provide information by clicking, selecting, or entering data to perform cyclic predictions. The interface content includes a data box for the first component parameters when the auxiliary busbar is configured, i.e., a data box for the component with PAD points, and a data box for the second component parameters when the auxiliary busbar is not configured, i.e., an OBB component data box.

[0068] In a specific embodiment, the first component parameter and the second component parameter may be input through the output module to predict the power difference of the photovoltaic cell assembly under different conditions, as shown in the following example:

[0069] Example 1: Calculation of the power difference between a photovoltaic cell assembly with and without auxiliary busbars, as shown in Tables 1 and 2,

[0070] Cell length: 210mm; Cell width: 210mm

[0071] Number of battery strings: 12; Number of half-cell cells per string: 11; Number of PAD points on the front: 7; Number of PAD points on the back: 7;

[0072] Number of main grids on the front: 18; number of main grids on the back: 18; number of auxiliary grids on the front: 168; number of auxiliary grids on the back: 250.

[0073] Total power of front ribbon Total power of backside soldering ribbon Total power loss of the ribbon 0.0128 0.0127 0.0255

[0074] Table 1 Power loss of 210 half-cell cells without auxiliary main grid cells in the embodiment of the present invention (Watt)

[0075]

[0076] Table 2 Power loss of auxiliary busbar cells in embodiment 210 of the present invention in half-cell configuration / W

[0077] It can be concluded from Table 1 and Table 2 that the power increase per module of the 210-cell module without auxiliary busbar is 6.267 watts compared with the module with auxiliary busbar.

[0078] Example 2: Calculation of the power difference between another type of solar cell without auxiliary busbar and photovoltaic cell assembly with auxiliary busbar, as shown in Table 3 and Table 4,

[0079] Cell length: 182mm; Cell width: 182mm

[0080] Number of battery strings: 12; Number of half-cell cells per string: 12; Number of PAD points on the front: 6; Number of PAD points on the back: 6;

[0081] Number of main grids on the front: 16; number of main grids on the back: 16; number of auxiliary grids on the front: 148; number of auxiliary grids on the back: 188.

[0082] Total power of front ribbon Total power of backside soldering ribbon Total power loss of the ribbon 0.0071 0.0070 0.0141

[0083] Table 3 Power loss of 182 half-cell cells without auxiliary main grid cells in embodiment of the present invention (Watt)

[0084]

[0085] Table 4 Power loss of auxiliary busbar cells in embodiment 182 of the present invention in half-cell configuration (Watt)

[0086] It can be concluded from Tables 3 and 4 that the power increase per module of the 182-cell module without auxiliary busbar is 5.395 watts compared to the module with auxiliary busbar.

[0087] Example 3: The power difference between another type of solar cell without auxiliary busbar and photovoltaic cell assembly with auxiliary busbar is calculated, as shown in Table 5 and Table 6.

[0088] Cell length: 182mm; Cell width: 191.6mm

[0089] Number of battery strings: 12; Number of half-cell cells per string: 12; Number of PAD points on the front: 6; Number of PAD points on the back: 7;

[0090] Number of main grids on the front: 16; number of main grids on the back: 16; number of auxiliary grids on the front: 148; number of auxiliary grids on the back: 200.

[0091] Total power of front ribbon Total power of backside soldering ribbon Total power loss of the ribbon 0.0082 0.0082 0.0164

[0092] Table 5 Power loss of 182R half-cell battery without auxiliary busbar battery in the embodiment of the present invention (Watt)

[0093]

[0094] Table 6 Power loss of auxiliary busbar cells in 182R half-cell configuration according to the embodiment of the present invention (Watt)

[0095] It can be concluded from Tables 5 and 6 that the power increase per module of the 182R cell module without auxiliary busbar is 4.918 watts compared with the module with auxiliary busbar.

[0096] In summary, according to the system 100 for predicting the power difference of photovoltaic cell assemblies according to an embodiment of the present invention, the power loss of the two photovoltaic cell assemblies can be calculated respectively by obtaining the first component parameters of the photovoltaic cell assembly when the auxiliary main grid is configured and the second component parameters when the auxiliary main grid is not configured, and the power difference of the two photovoltaic cell assemblies can be predicted based on the power loss, thereby achieving an accurate prediction of the difference between the power of the photovoltaic cell assembly without the auxiliary main grid and the power of the photovoltaic cell assembly with the auxiliary main grid, and then determining the change in the power of the photovoltaic cell assembly without the auxiliary main grid relative to the power of the photovoltaic cell assembly with the auxiliary main grid.

[0097] Figure 2 FIG. 1 is a flow chart of a method for predicting power differences of photovoltaic cell assemblies according to an embodiment of the present invention. Figure 2 The method for predicting the power difference of a photovoltaic cell assembly comprises the following steps:

[0098] Step S1: obtaining first component parameters of a photovoltaic cell component when an auxiliary busbar is configured and second component parameters when an auxiliary busbar is not configured.

[0099] Step S2: calculating a first power loss of the photovoltaic cell assembly when the auxiliary busbar is configured according to the first assembly parameter, and calculating a second power loss of the photovoltaic cell assembly when the auxiliary busbar is not configured.

[0100] Step S3: predicting the power difference of the photovoltaic cell assembly according to the first power loss and the second power loss.

[0101] In one embodiment of the present invention, the first component parameters include: the elementary resistance of the welding strip on the front of the photovoltaic cell module, the elementary resistance of the auxiliary main grid on the front of the photovoltaic cell module, the number of sub-grids between the two PAD points on the front of the photovoltaic cell module, the elementary current density on the front of the photovoltaic cell module, the number of PAD points on the front of the photovoltaic cell module, the elementary resistance of the welding strip on the back of the photovoltaic cell module, the elementary resistance of the auxiliary main grid on the back of the photovoltaic cell module, the number of sub-grids between the two PAD points on the back of the photovoltaic cell module, the elementary current density on the back of the photovoltaic cell module, and the number of PAD points on the back of the photovoltaic cell module.

[0102] In one embodiment of the present invention, when calculating the first power loss of a photovoltaic cell assembly when configuring an auxiliary main grid according to the first component parameters, it specifically includes: calculating the front weld ribbon loss power, the front auxiliary main grid loss power, the back weld ribbon loss power and the back auxiliary main grid loss power of the photovoltaic cell assembly according to the first component parameters; and calculating the first power loss according to the sum of the front weld ribbon loss power, the front auxiliary main grid loss power, the back weld ribbon loss power and the back auxiliary main grid loss power.

[0103] In one embodiment of the present invention, the front-side welding ribbon loss power, the front-side auxiliary main grid loss power, the back-side welding ribbon loss power, and the back-side auxiliary main grid loss power of the photovoltaic cell module are calculated by the following formula:

[0104]

[0105]

[0106]

[0107]

[0108] Among them, P fr_rib1 is the front welding strip loss power, a1 is the number of auxiliary grids between the two PAD points on the front of the photovoltaic cell module, a1 / / 2 means a1 is divided by 2 and rounded up, I base1 is the elementary current density on the front of the photovoltaic cell module, k1 is the number of PAD points on the front of the photovoltaic cell module, R fr_rib1 is the elementary resistance of the soldering tape on the front of the photovoltaic cell module, P fr_bus1 is the front auxiliary main grid power loss, R ft_bus1 is the elementary resistance of the auxiliary main grid on the front of the photovoltaic cell module, P fr_rib2 is the back welding strip loss power, a2 is the number of auxiliary grids between the two PAD points on the back of the photovoltaic cell module, I base2 is the elementary current density on the back of the photovoltaic cell module, k2 is the number of PAD points on the back of the photovoltaic cell module, Rft_rib2 is the elementary resistance of the soldering tape on the back of the photovoltaic cell module, P fr_bus2 is the auxiliary main grid loss power on the back side, R fr_bus2 It is the elementary resistance of the auxiliary main grid on the back of the photovoltaic cell module.

[0109] In one embodiment of the present invention, the second component parameters include: the elementary resistance of the welding strip on the front of the photovoltaic cell module, the elementary current density on the front of the photovoltaic cell module, the number of intersections between the auxiliary grid and the welding strip on the front of the photovoltaic cell module, the elementary resistance of the welding strip on the back of the photovoltaic cell module, the elementary current density on the back of the photovoltaic cell module, and the number of intersections between the auxiliary grid and the welding strip on the back of the photovoltaic cell module.

[0110] In one embodiment of the present invention, when calculating the second power loss of the photovoltaic cell assembly when the auxiliary main grid is not configured according to the second component parameters, it specifically includes: calculating the front weld ribbon loss power and the back weld ribbon loss power of the photovoltaic cell assembly according to the second component parameters; and calculating the second power loss according to the sum of the front weld ribbon loss power and the back weld ribbon loss power.

[0111] In one embodiment of the present invention, the front-side welding ribbon power loss and the back-side welding ribbon power loss of the photovoltaic cell module are calculated by the following formula:

[0112]

[0113]

[0114] Among them, P fr_rib3 is the front side welding strip power loss, I base3 is the elementary current density on the front of the photovoltaic cell module, k3 is the number of intersections between the auxiliary grid and the welding strip on the front of the photovoltaic cell module, R fr_rib3 is the elementary resistance of the soldering tape on the front of the photovoltaic cell module, P fr_rib4 is the backside solder strip power loss, I base4 is the elementary current density on the back of the photovoltaic cell module, k4 is the number of intersections between the auxiliary grid and the welding strip on the back of the photovoltaic cell module, R fr_rib4 It is the elementary resistance of the soldering ribbon on the back of the photovoltaic cell module.

[0115] In one embodiment of the present invention, the method for predicting the power difference of a photovoltaic cell assembly further includes: obtaining the number of cell strings in the photovoltaic cell assembly, the number of half-cell cells in each cell string, and predicting the power difference of the photovoltaic cell assembly by the following formula: power difference = first power loss * number of cell strings * number of half-cell cells in each cell string - second power loss * number of cell strings * number of half-cell cells in each cell string.

[0116] In one embodiment of the present invention, the method for predicting power differences of photovoltaic cell assemblies further includes: providing an input interface to receive a first assembly parameter and a second assembly parameter input by a user through operating the input interface.

[0117] It should be noted that when predicting the power difference of photovoltaic cell assemblies, the specific implementation method of the method for predicting the power difference of photovoltaic cell assemblies is similar to the specific implementation method of the system for predicting the power difference of photovoltaic cell assemblies in any of the above-mentioned embodiments of the present invention. Therefore, for a detailed exemplary description of the method for predicting the power difference of photovoltaic cell assemblies, please refer to the relevant description part of the aforementioned system for predicting the power difference of photovoltaic cell assemblies. In order to reduce redundancy, it will not be repeated here.

[0118] According to the method for predicting the power difference of photovoltaic cell assemblies in an embodiment of the present invention, the power loss of the two photovoltaic cell assemblies can be calculated respectively by obtaining the first assembly parameters of the photovoltaic cell assembly when the auxiliary main grid is configured and the second assembly parameters when the auxiliary main grid is not configured, and the power difference of the two photovoltaic cell assemblies is predicted based on the power loss, thereby achieving an accurate prediction of the difference in power between the photovoltaic cell assembly without the auxiliary main grid and the photovoltaic cell assembly with the auxiliary main grid, and then determining the change in power of the photovoltaic cell assembly without the auxiliary main grid relative to the photovoltaic cell assembly with the auxiliary main grid.

[0119] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0120] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A system for predicting power differences of photovoltaic cell assemblies, characterized in that: include: An acquisition module, configured to acquire a first component parameter of the photovoltaic cell assembly when the auxiliary busbar is configured and a second component parameter when the auxiliary busbar is not configured; a calculation module, configured to calculate, based on the first component parameters, a first power loss of the photovoltaic cell assembly when an auxiliary busbar is configured, and to calculate a second power loss of the photovoltaic cell assembly when no auxiliary busbar is configured; The prediction module is used to predict the power difference of the photovoltaic cell assembly according to the first power loss and the second power loss.

2. The system for predicting power differences of photovoltaic cell assemblies according to claim 1, characterized in that: The first component parameters include: the elementary resistance of the welding strip on the front of the photovoltaic cell component, the elementary resistance of the auxiliary main grid on the front of the photovoltaic cell component, the number of auxiliary grids between the two PAD points on the front of the photovoltaic cell component, the elementary current density on the front of the photovoltaic cell component, the number of PAD points on the front of the photovoltaic cell component, the elementary resistance of the welding strip on the back of the photovoltaic cell component, the elementary resistance of the auxiliary main grid on the back of the photovoltaic cell component, the number of auxiliary grids between the two PAD points on the back of the photovoltaic cell component, the elementary current density on the back of the photovoltaic cell component, and the number of PAD points on the back of the photovoltaic cell component.

3. The system for predicting power differences of photovoltaic cell assemblies according to claim 2, characterized in that: When the calculation module calculates the first power loss of the photovoltaic cell assembly when the auxiliary main grid is configured according to the first assembly parameter, it is specifically used to: Calculate the front welding ribbon loss power, front auxiliary main grid loss power, back welding ribbon loss power and back auxiliary main grid loss power of the photovoltaic cell assembly according to the first assembly parameters; The first power loss is calculated according to the sum of the front solder strip loss power, the front auxiliary main grid loss power, the back solder strip loss power and the back auxiliary main grid loss power.

4. The system for predicting power differences of photovoltaic cell assemblies according to claim 3, characterized in that: The calculation module is used to calculate the front welding ribbon loss power, the front auxiliary main grid loss power, the back welding ribbon loss power and the back auxiliary main grid loss power of the photovoltaic cell assembly by the following formula: Among them, P fr_rib1 is the power loss of the front welding strip, a1 is the number of auxiliary grids between the two PAD points on the front of the photovoltaic cell module, and a 1 / / 2 Indicates that a1 is divided by 2 and rounded up. base1 is the elementary current density on the front of the photovoltaic cell assembly, k1 is the number of PAD points on the front of the photovoltaic cell assembly, R fr_rib1 is the elementary resistance of the soldering tape on the front of the photovoltaic cell assembly, P fr_bus1 is the front auxiliary main grid power loss, R fr_bus1 is the elementary resistance of the auxiliary main grid on the front side of the photovoltaic cell assembly, P fr_rib2 is the power loss of the back welding strip, a2 is the number of auxiliary grids between the two PAD points on the back of the photovoltaic cell assembly, I base2 is the cell current density on the back of the photovoltaic cell assembly, k2 is the number of PAD points on the back of the photovoltaic cell assembly, R fr_rib2 is the elementary resistance of the soldering tape on the back of the photovoltaic cell assembly, P fr_bus2 is the back auxiliary main grid power loss, R fr_bus2 is the elementary resistance of the auxiliary main grid on the back of the photovoltaic cell assembly.

5. The system for predicting power differences of photovoltaic cell assemblies according to claim 1, characterized in that: The second component parameters include: the elementary resistance of the welding strip on the front of the photovoltaic cell component, the elementary current density on the front of the photovoltaic cell component, the number of intersections between the auxiliary grid and the welding strip on the front of the photovoltaic cell component, the elementary resistance of the welding strip on the back of the photovoltaic cell component, the elementary current density on the back of the photovoltaic cell component, and the number of intersections between the auxiliary grid and the welding strip on the back of the photovoltaic cell component.

6. The system for predicting power differences of photovoltaic cell assemblies according to claim 5, characterized in that: When the calculation module calculates the second power loss of the photovoltaic cell assembly when no auxiliary main grid is configured based on the second assembly parameter, it is specifically used to: Calculating the front-side welding ribbon power loss and the back-side welding ribbon power loss of the photovoltaic cell assembly according to the second assembly parameters; The second power loss is calculated according to the sum of the front solder strip power loss and the back solder strip power loss.

7. The system for predicting power differences of photovoltaic cell assemblies according to claim 6, characterized in that: The calculation module is used to calculate the front-side welding strip power loss and the back-side welding strip power loss of the photovoltaic cell assembly using the following formula: Among them, P fr_rib3 is the front solder strip power loss, I base3 is the elementary current density on the front of the photovoltaic cell assembly, k3 is the number of intersections between the auxiliary grid and the welding strip on the front of the photovoltaic cell assembly, R fr_rib3 is the elementary resistance of the soldering tape on the front of the photovoltaic cell assembly, P fr_rib4 is the back solder strip power loss, I base4 is the cell current density on the back of the photovoltaic cell assembly, k4 is the number of intersections between the auxiliary grid and the welding strip on the back of the photovoltaic cell assembly, R fr_rib4 is the elementary resistance of the welding strip on the back of the photovoltaic cell assembly.

8. The system for predicting power differences of photovoltaic cell assemblies according to claim 1, characterized in that: The acquisition module is further used to obtain the number of battery strings in the photovoltaic cell assembly and the number of half-cell batteries in each battery string; The prediction module is specifically used to predict the power difference of the photovoltaic cell assembly through the following formula: Power difference = the first power loss * the number of battery strings * the number of half-cell batteries in each battery string - the second power loss * the number of battery strings * the number of half-cell batteries in each battery string.

9. The system for predicting power differences of a photovoltaic cell assembly according to claim 1, further comprising: An input module is used to provide an input interface to receive the first component parameter and the second component parameter input by a user by operating the input interface.

10. A method for predicting power differences of photovoltaic cell assemblies, characterized in that: include: Acquire a first component parameter of the photovoltaic cell assembly when the auxiliary main grid is configured and a second component parameter when the auxiliary main grid is not configured; Calculating a first power loss of the photovoltaic cell assembly when the auxiliary busbar is configured according to the first assembly parameter, and calculating a second power loss of the photovoltaic cell assembly when the auxiliary busbar is not configured; The power difference of the photovoltaic cell assembly is predicted according to the first power loss and the second power loss.

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