Method and system for designing model parameters of HJT battery assembly based on analog simulation

Abstract

The invention provides an analog simulation-based HJT battery assembly pattern parameter design method and system, and the method comprises the steps: obtaining the size of a to-be-processed HJT battery and the design of a plurality of to-be-selected main grid lines, and determining the input parameters of analog simulation; inputting the input parameters into a solar cell analog simulation application, performing analog simulation analysis on the number of auxiliary grids selected under each main grid line design in the analog simulation application, and determining a plurality of cell electrode parameters when the cell efficiency reaches a peak value under each main grid line design; determining a target grid line design by comparing battery performances corresponding to a plurality of battery electrode parameters of each main grid line design; and based on a plurality of battery electrode parameters under the target grid line design, determining a welding strip parameter and a battery piece series connection interval in the assembly. According to the method, a plurality of module model parameters capable of effectively improving the efficiency of the battery module can be obtained based on analog simulation analysis, and the rationality and convenience of module parameter design are improved.

Description

Technical Field

[0001] The present application relates to the technical field of solar cell manufacturing, and in particular to a method and system for designing HJT battery component template parameters based on simulation. Background Art

[0002] With the increasing popularity of intrinsic thin-film heterojunction technology (HJT) in various fields, the efficiency of HJT batteries has attracted more and more attention, and improving the efficiency of HJT battery modules has become an important goal in the development of HJT batteries. The template parameters of HJT battery modules are an important factor affecting the efficiency of modules.

[0003] In the related art, the production of components is usually carried out according to a fixed design and production process. When the component parameters need to be adjusted, a small batch trial production is usually adopted before the finished product testing. In the related art, it is impossible to efficiently design the template parameters that can improve the efficiency of HJT battery components, and the design cost is high. 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 purpose of this application is to propose a design method for HJT battery module layout parameters based on simulation. This method can obtain multiple module layout parameters that effectively improve the efficiency of battery modules based on simulation analysis, thereby improving the rationality and convenience of module parameter design.

[0006] The second objective of this application is to propose a design system for HJT battery component layout parameters based on simulation.

[0007] A third object of the present application is to provide a non-transitory computer-readable storage medium.

[0008] To achieve the above-mentioned purpose, the first aspect of the present application is to propose a method for designing HJT battery assembly template parameters based on simulation, the method comprising the following steps:

[0009] Obtaining the size of the HJT battery to be processed and a plurality of busbar designs to be selected, and determining input parameters of the simulation based on the size and the plurality of busbar designs to be selected;

[0010] Input the input parameters into a solar cell simulation application, and perform simulation analysis on the number of sub-grids selected under each of the main grid lines in the simulation application to determine multiple battery electrode parameters when the battery efficiency reaches a peak under each of the main grid lines, wherein the multiple battery electrode parameters include the number of front sub-grids and the number of back sub-grids;

[0011] Determine a target busbar design by comparing the battery performance corresponding to the plurality of battery electrode parameters under each of the busbar designs;

[0012] Based on a plurality of battery electrode parameters under the target grid line design, the welding strip parameters and the battery cell series connection spacing in the assembly matching the target grid line design are determined.

[0013] Optionally, in one embodiment of the present application, the determination of multiple battery electrode parameters when the battery efficiency reaches a peak value under each of the main bus line designs includes: for any main bus line design, determining the welding points set on each main bus line, and fixing the number of back side sub-grids; within a preset range of the number of first bus lines, simulating the HJT battery efficiency under different numbers of front side sub-grids, and determining a correspondence curve between battery efficiency and the number of front side sub-grids; and determining the number of front side sub-grids corresponding to the maximum battery efficiency based on the correspondence curve.

[0014] Optionally, in one embodiment of the present application, after simulating the HJT battery efficiency under different numbers of front sub-grids, it also includes: simulating the open circuit voltage, fill factor FF and short-circuit current Jsc of the HJT battery under different numbers of front sub-grids, and determining the changing trends of the open circuit voltage, the fill factor and the short-circuit current as the number of front sub-grids increases; and determining the number of front sub-grids corresponding to the maximum value of the battery efficiency in combination with the changing trend of the fill factor.

[0015] Optionally, in one embodiment of the present application, after determining the number of front sub-grids corresponding to the maximum battery efficiency according to the corresponding relationship curve, it also includes: taking the number of front sub-grids corresponding to the maximum battery efficiency as the fixed number of front sub-grids, and within the preset second grid line number range, simulating the open circuit voltage, fill factor FF, short circuit current Jsc and battery efficiency of the HJT battery under different numbers of back sub-grids, and determining the changing trends of the fill factor and the battery efficiency with the increase of the number of back sub-grids; and determining the number of back sub-grids corresponding to the maximum battery efficiency in combination with the changing trend of the fill factor, the changing trend of the battery efficiency and the screen printing process.

[0016] Optionally, in one embodiment of the present application, the target bus bar design is determined by comparing the battery performance corresponding to multiple battery electrode parameters of each bus bar design, including: setting the number of front and back side sub-grids of the battery under each bus bar design according to the number of front side sub-grids and the number of back side sub-grids obtained by simulation analysis, and detecting multiple battery electrical performance parameters under each bus bar design after the sub-grids are set; and selecting a target bus bar design from the multiple bus bar designs in combination with the multiple battery electrical performance parameters and shading conditions.

[0017] Optionally, in one embodiment of the present application, determining the solder strip parameters that match the target gate line design includes: setting the gate lines of the HJT battery assembly according to the target gate line design, and calculating the maximum power of the HJT battery assembly after the gate lines are set under solder strips of different diameters, and taking the solder strip diameter corresponding to the maximum value of each of the maximum powers as the solder strip parameter that matches the target gate line design.

[0018] Optionally, in one embodiment of the present application, determining the series spacing of the battery cells in the component includes: overlapping partial areas of two battery cells connected in series in the HJT battery component, and expanding the contact area between the welding strip and the battery cell by flattening the overlapping area; or, performing electroluminescence detection EL on the edge areas of the two battery cells connected in series, with the goal of ensuring that there are no hidden cracks and fragments in the edge areas in the EL image, and adjusting the spacing between the two battery cells connected in series to within a preset distance.

[0019] To achieve the above purpose, the second aspect of the present application also proposes a design system for HJT battery assembly template parameters based on simulation, including the following modules:

[0020] An acquisition module, used for acquiring the size of the HJT battery to be processed and a plurality of busbar designs to be selected, and determining input parameters of the simulation based on the size and the plurality of busbar designs to be selected;

[0021] A simulation module, used for inputting the input parameters into a solar cell simulation application, in which the number of sub-grids selected under each of the busbar designs is respectively simulated and analyzed to determine a plurality of battery electrode parameters when the battery efficiency reaches a peak under each of the busbar designs, wherein the plurality of battery electrode parameters include the number of front sub-grids and the number of back sub-grids;

[0022] A comparison module, configured to determine a target busbar design by comparing the battery performance corresponding to the plurality of battery electrode parameters under each busbar design;

[0023] The determination module is used to determine the welding strip parameters and the battery cell series connection spacing in the component that match the target grid line design based on multiple battery electrode parameters under the target grid line design.

[0024] In order to implement the above-mentioned embodiments, the third aspect of the present application also proposes a non-temporary computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the design method of the HJT battery component layout parameters based on simulation in the above-mentioned first aspect is implemented.

[0025] The technical solution provided by the embodiment of the present application brings at least the following beneficial effects: the present application first obtains the size of the HJT battery to be processed and the multiple main grid designs to be selected, and determines the input parameters of the simulation based on the size and the multiple main grid designs to be selected; the input parameters are input into the solar cell simulation application, and the number of sub-grids selected under each main grid design is simulated and analyzed in the simulation application to determine the multiple battery electrode parameters when the battery efficiency reaches the peak under each main grid design, and the multiple battery electrode parameters include the number of front sub-grids and the number of back sub-grids; by comparing the battery performance corresponding to the multiple battery electrode parameters under each main grid design, the target grid design is determined; based on the multiple battery electrode parameters under the target grid design, the welding strip parameters and the battery cell series spacing in the assembly that match the target grid design are determined. Thus, the present application simulates and simulates a variety of main grid technologies, and the number of front and back sub-grids that can effectively improve the battery efficiency can be obtained through simulation analysis, and then the layout parameters of the HJT battery assembly after the grid setting is completed are determined from the two aspects of assembly power and packaging density. Based on the obtained layout parameters, the efficiency of the battery assembly can be further improved. Therefore, this application can obtain component layout parameters that effectively improve the efficiency of battery components through simulation analysis, optimize the grid line current collection capacity, and reduce the cost of parameter design through simulation design, thereby improving the rationality and convenience of component parameter design and improving the efficiency of HJT battery components.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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:

[0028] Figure 1 A flow chart of a method for designing HJT battery assembly template parameters based on simulation proposed in an embodiment of the present application;

[0029] Figure 2A flow chart of a method for determining the number of front sub-grids proposed in an embodiment of the present application;

[0030] Figure 3 A schematic diagram of an efficiency curve according to the number of front sub-grids proposed in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of a variation trend curve of FF and Jsc as the number of front sub-grids changes, as proposed in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of a curve showing a change trend of FF and Eff as the number of back-side auxiliary grids changes, as proposed in an embodiment of the present application;

[0033] Figure 6 This is another schematic diagram of an efficiency curve that varies with the number of front sub-grids proposed in an embodiment of the present application;

[0034] Figure 7 This is another schematic diagram of a variation trend curve of FF and Jsc as the number of front sub-grids changes, as proposed in an embodiment of the present application;

[0035] Figure 8 Another variation trend curve diagram of FF and Eff as the number of back-side auxiliary grids changes is provided in an embodiment of the present application;

[0036] Fig. 9 A schematic diagram of the structure of a design system for a high conversion rate packaging material for an HJT battery assembly proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which 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 invention, and should not be construed as limiting the present invention.

[0038] A method and system for designing HJT battery assembly template parameters based on simulation according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0039] Figure 1 A flow chart of a method for designing HJT battery assembly template parameters based on simulation proposed in an embodiment of the present application, such as Figure 1 As shown, the method comprises the following steps:

[0040] Step S101, obtaining the size of the HJT battery to be processed and multiple busbar designs to be selected, and determining the input parameters of the simulation based on the size and the multiple busbar designs to be selected.

[0041] Specifically, the size of the HJT battery of the current design template parameters and multiple possible main bus bar design schemes are obtained, and the size parameters and parameters in the main bus bar design scheme, such as the number of main bus bars and bus bar size, are obtained as input parameters for subsequent simulation.

[0042] For example, the size of the HJT battery can refer to the size of the mainstream high-efficiency heterojunction battery cell in the relevant technology, which is divided into two types: 182 half-cell and 210 half-cell. Since the 182-size battery cell has a larger chamfer, this embodiment can adopt a 210-size battery cell.

[0043] For the multiple busbar designs to be selected, the classic H-Pattern busbar design of crystalline silicon photovoltaic cells can be used to perform simulation analysis based on two multi-busbar technologies: 15busbar (abbreviated as BB) and 20busbar (abbreviated as BB). Further, after determining the multiple busbar design schemes to be selected, the number of busbars is determined. Then, the size and other parameters of the busbars can be obtained by combining reading existing design parameters or performing actual testing.

[0044] As an example, a single designed grid line can be measured to obtain a front thin grid line width of 57.5um and a height of 15.3um, and a back thin grid line width of 68.9um and a height of 16.2um. The front and back surface resistance of the battery is also tested to obtain a front square resistance of 43.7ohm / sq and a back square resistance of 87.1ohm / sq.

[0045] Step S102, input the input parameters into a solar cell simulation application, and perform simulation analysis on the number of sub-grids selected under each main grid line design in the simulation application to determine multiple battery electrode parameters when the battery efficiency reaches a peak under each main grid line design, and the multiple battery electrode parameters include the number of front sub-grids and the number of back sub-grids.

[0046] Specifically, the input parameters obtained in the previous step are input into the solar cell simulation application. Based on the input parameters, a virtual model can be generated in the simulation application and the basic parameters of the simulation can be determined. For example, according to the battery size and grid line parameters obtained in the example in the previous step, a simulation of the metallization of a 210×105mm heterojunction battery can be performed according to the measured data.

[0047] Among them, the simulation application used can select the corresponding solar cell simulation software according to the actual simulation function requirements, such as SCAPS-1D and Griddler.

[0048] Furthermore, in the simulation application, the HJT battery under each busbar design is simulated and studied to determine the battery efficiency corresponding to different battery electrode parameters under each busbar design, so as to determine the battery electrode parameters corresponding to the highest battery efficiency. Among them, the multiple battery electrode parameters include the number of front sub-grids, the number of back sub-grids and welding points.

[0049] In order to more clearly describe the specific implementation process of the present application for determining multiple battery electrode parameters when the battery efficiency reaches the peak under each main grid line design, an exemplary description is given below using a method for determining the number of front sub-grids proposed in an embodiment of the present application. Figure 2 This is a flow chart of a method for determining the number of front sub-grids proposed in an embodiment of the present application, such as Figure 2 As shown, the method comprises the following steps:

[0050] Step S201, for any busbar design, determine the welding points set on each busbar, and fix the number of back sub-grids.

[0051] For example, the two busbar designs of 15BB and 20BB in step S101 are described as examples. First, a simulation study is conducted on the busbar design of 15BB. You can refer to the current mainstream design of HJT batteries, set 6 welding points for each busbar, and fix the number of sub-grids on the back to 80.

[0052] Step S202, within a preset range of the number of first gate lines, simulating the HJT battery efficiency under different numbers of front sub-gates, and determining a corresponding relationship curve between the battery efficiency and the number of front sub-gates.

[0053] Specifically, the module is performed within the range of 10 to 70 front auxiliary grids (i.e., the range of the number of first grid lines), and the efficiency (Eff) of the HJT battery with 10 to 70 front auxiliary grids is simulated respectively, and the corresponding relationship curve is generated. The simulation results are as follows: Figure 3 As shown. Figure 3 It can be seen that when the number of positive grids is between 10 and 52, the battery efficiency increases with the number of grid lines, and when the number is greater than 52, the efficiency decreases with the number of grid lines. Among them, the battery efficiency increases significantly when the number of positive grids is between 10 and 30.

[0054] In one embodiment of the present application, after simulating the HJT battery efficiency under different numbers of front sub-grids, it also includes: simulating the open circuit voltage, fill factor FF and short-circuit current Jsc of the HJT battery under different numbers of front sub-grids, and determining the changing trends of the open circuit voltage, fill factor and short-circuit current with the increase of the number of front sub-grids.

[0055] Specifically, the various performances of the battery are further analyzed, among which the open circuit voltage Voc remains at 748mV under different gate lines and is not affected by the gate line. The change trends of FF and Jsc are shown in Figure 4 As shown, since adding positive surface grid lines will affect the light absorption area of ​​the battery, Jsc decreases with the increase of positive grid numbers, and the overall trend is close to linear.

[0056] Step S203, determining the number of front sub-grids corresponding to the maximum battery efficiency according to the corresponding relationship curve.

[0057] Specifically, according to Figure 3 The corresponding relationship curve between battery efficiency and the number of front sub-grids is shown, and the number of front sub-grids corresponding to the maximum battery efficiency can be determined from the figure. In one embodiment of the present application, the number of front sub-grids corresponding to the maximum battery efficiency can also be determined from multiple aspects in combination with the change trend of the fill factor obtained in step S202.

[0058] For example, Figure 3 and Figure 4 As shown in the figure, as the number of grid lines increases, the ability of the metallized electrode to collect current on the surface of the battery gradually increases. Therefore, the FF of the battery increases with the increase in the number of grid lines, and the upward trend gradually slows down with the increase in the number of grid lines. When the number of grid lines is greater than 50, the ability of the metallized electrode to collect current approaches saturation, and the FF improvement obtained by further increasing the number of positive grids is relatively low. Under the influence of both light shielding and current collection, the battery efficiency first increases and then decreases with the increase in the number of positive grids. Therefore, based on the above factors, it can be determined that the battery efficiency reaches its maximum value when the number of positive grids reaches 52.

[0059] Therefore, in this example, the number of front sub-grids corresponding to the maximum battery efficiency is determined to be 52.

[0060] Furthermore, after determining the number of front sub-grids, it is also necessary to determine the number of back sub-grids. In one embodiment of the present application, after determining the number of front sub-grids corresponding to the maximum battery efficiency according to the corresponding relationship curve, it also includes: taking the number of front sub-grids corresponding to the maximum battery efficiency as the fixed number of front sub-grids, and within the preset second grid line number range, simulating the open circuit voltage, fill factor FF, short circuit current Jsc and battery efficiency of the HJT battery under different numbers of back sub-grids, respectively determining the changing trends of the fill factor and battery efficiency with the increase of the number of back sub-grids; and then combining the changing trend of the fill factor, the changing trend of the battery efficiency and the screen printing process to determine the number of back sub-grids corresponding to the maximum battery efficiency.

[0061] Specifically, in this embodiment, after the number of front grids is determined to be 52 through the above example, the number of front sub-grids is fixed to 52, and the number of back sub-grids is set from 48 to 128 (i.e., the range of the number of second grid lines) for simulation. The simulation results show that Voc and Jsc are both maintained at 748mV and 39.29mA / cm2, and are not affected by the number of back sub-grids. The reason for this is that the back grid does not affect the light received by the front surface of the battery.

[0062] And, the trend curves of FF and Eff obtained Figure 5 As shown, the FF trend is similar to the simulation result of the number of front sub-grids in the above example. With the increase of the number of back sub-grids, when the number of back sub-grids is greater than 80, the current collection capacity is close to saturation, and further increasing the number of grid lines has little effect on FF, because the Voc and Jsc of the battery are not affected by the number of back grids, and the change trend of Eff is basically consistent with FF. After combining the simulation results and the actual printing process limitations, when the grid lines are too dense, screen printing cannot use knotless screens, and oblique screen printing has a certain impact on the quality of the grid lines. Therefore, considering various factors comprehensively, the number of back sub-grids is selected as 88.

[0063] Therefore, the embodiment of the present application determines multiple battery electrode parameters when the battery efficiency reaches the peak under the 15BB main grid design, including: the number of front sub-grids is 52, the number of back sub-grids is 88, 15 main grids are set on the front and back, and 6 welding PAD points are set on each main grid.

[0064] Based on the same principle, multiple battery electrode parameters are determined when the battery efficiency reaches the peak value under the remaining busbar designs.

[0065] For example, when simulating the heterojunction battery electrode pattern for a 20BB busbar design, the simulation parameters are the same as those for the 15BB in the above example. Six welding points are set for each busbar. First, 80 back and front sub-grids and 10 to 70 front and rear sub-grids are fixed for simulation. The battery efficiency curve obtained by simulation is as follows: Figure 6 As shown in the figure, the battery efficiency increases first and then decreases with the increase of the number of positive grids, and reaches the maximum efficiency when the number of positive grids reaches 52. The overall trend change is similar to the simulation results of 15BB, but the change range is smaller than that of 15BB. The reason for this is that the main grid of 20BB is denser and its sensitivity to the number of auxiliary grids is reduced.

[0066] Further analysis of the battery performance under the 20BB design shows that the battery's Voc, Jsc and FF results are similar to those of the 15BB battery. Voc remains at 748mV under different gate lines. The trends of FF and Jsc are as follows: Figure 7As shown in the figure, due to the influence of grid line shading, Jsc decreases with the increase of the number of grid lines, and the trend is close to linear. FF increases with the increase of the number of grid lines, and the upward trend gradually slows down with the increase of the number of grid lines. When the number of grid lines is greater than 50, the ability of the metallized electrode to collect current is close to saturation. As with the results of 15BB, under the influence of both light shading and current collection, the battery efficiency first increases and then decreases with the increase of the number of positive grids. When the number of positive sub-grids reaches 52, the battery efficiency reaches the maximum value.

[0067] Furthermore, similar to the simulation analysis of the 15BB busbar design, after determining that the number of front sub-grids is 52, the number of front sub-grids is fixed at 52, and the number of back sub-grids is set to 48 to 128 for simulation. The results show that Voc and Jsc are both maintained at 748mV and 39.29mA / cm2, and are not affected by the number of back sub-grids. The change trends of FF and Eff are as follows Figure 8 As shown, the result is close to that of 15BB simulation, and the number of back sub-grids is selected to be 88 after comprehensive consideration.

[0068] Therefore, the embodiment of the present application determines multiple battery electrode parameters when the battery efficiency reaches the peak under the 20BB main grid design, including: the number of front sub-grids is 52, the number of back sub-grids is 88, 20 main grids are set on the front and back, and 6 welding PAD points are set on each main grid.

[0069] Step S103, determining a target busbar design by comparing battery performance corresponding to a plurality of battery electrode parameters under various busbar designs.

[0070] Specifically, based on the simulation analysis of the above steps, the optimal number of front and back sub-grids under different busbar designs are determined, so that each busbar design includes a complete set of multiple battery electrode parameters, such as the number of front and back grids. Then, according to the complete multiple battery electrode parameters obtained under each busbar design, the HJT battery is set, and after the setting is completed, the battery performance corresponding to the multiple battery electrode parameters under each busbar design under the optimal number of front and back grids is actually tested.

[0071] In one embodiment of the present application, a target busbar design is determined by comparing the battery performance corresponding to multiple battery electrode parameters of each busbar design, including: setting the number of front and back sub-grids of the battery under each busbar design according to the number of front and back sub-grids obtained from simulation analysis, and detecting multiple battery electrical performance parameters under each busbar design after the sub-grids are set; and selecting a target busbar design from multiple busbar designs in combination with multiple battery electrical performance parameters and shading conditions.

[0072] For example, continuing to refer to the above example, the performance of the battery under the 15BB and 20BB grid line designs is shown in the following Table 1.

[0073] Table 1 Electrical performance parameters of 15BB and 20BB batteries under optimized fine grid

[0074]

[0075] It can be seen from Table 1 that compared with the 15BB busbar design, the 20BB battery has certain disadvantages in light shielding (such as shading rate and other shading conditions) due to the larger number of busbars, but the FF is higher and the overall battery efficiency is better. Therefore, the design parameters of the 20BB busbar design with 52 front sub-grids, 88 back sub-grids, and 20 busbars on the front and back (that is, the target busbar design including the target front and back sub-grids) are selected for subsequent experiments.

[0076] Step S104, based on a plurality of battery electrode parameters under the target grid line design, determining the welding strip parameters and the battery cell series connection spacing in the assembly that match the target grid line design.

[0077] Specifically, based on the multiple battery electrode parameters under the target grid line design determined in the above steps, such as the number of front and back subgrids of the 210-20BB battery in the above example, the heterojunction battery cell is customized for component layout research. The layout parameter design targeted by this application mainly includes the matching of the main grid and the welding strip, and the series spacing process of the battery cell, so as to improve the efficiency of the HJT battery component in terms of component power and packaging density.

[0078] In one embodiment of the present application, determining the solder strip parameters that match the target grid line design includes: setting the grid lines of the HJT battery assembly according to the target grid line design, and calculating the maximum power of the HJT battery assembly after the grid lines are set under solder strips of different diameters, and taking the solder strip diameter corresponding to the maximum value of each maximum power as the solder strip parameter that matches the target grid line design.

[0079] Specifically, in the study of the matching of the main grid and the welding tape, the grid line of the HJT battery module is first set according to the target grid line design determined in the previous step. After the grid line is set, the round wire low-temperature welding tape with a diameter of 0.26mm to 0.34mm is selected to experiment with the set HJT battery module to obtain the maximum power of the module under welding tapes of different diameters, and the maximum power under each welding tape diameter is obtained by comparison. By comparing the results, it can be determined that the maximum power of the module under the 0.32mm welding tape can reach 689.71W, which is the maximum value under different diameters. By analyzing the reasons, it can be determined that thicker welding tapes can reduce resistance and reduce power loss in the module, but it will cause a larger area of ​​light blocking, affecting the short-circuit current of the module. The 0.32mm welding tape is closer to the balance point between the two, so the module power is the maximum.

[0080] In one embodiment of the present application, determining the spacing of the series-connected battery cells in the assembly includes: overlapping partial areas of two battery cells connected in series in the HJT battery assembly, and expanding the contact area between the welding strip and the battery cell by flattening the overlapping area; or, performing electroluminescence detection EL on the edge areas of the two battery cells connected in series, with the goal of ensuring that there are no hidden cracks and fragments in the edge areas in the EL image, and adjusting the spacing of the two battery cells connected in series to within a preset distance.

[0081] Specifically, in this embodiment, the design of the micro-pitch parameters of the series connection of components is performed. Since the efficiency of the component is mainly determined by two factors, power and component area, a smaller cell spacing can effectively reduce the component area to achieve higher component efficiency. This embodiment studies two technologies for reducing the cell spacing: negative spacing and micro spacing.

[0082] Among them, negative spacing is achieved by directly overlapping the two adjacent cells in the string, thereby completely eliminating the gap. The EL image obtained by electroluminescence detection EL of the negative spacing experimental components shows that although the negative spacing greatly reduces the gap between the cells and improves the packaging density of the components, it causes a large number of cell cracks and fragments. Analysis of the cause determined that the round wire welding ribbon sandwiched between the two cells was subjected to greater pressure during the lamination process.

[0083] To this end, this embodiment improves the negative spacing component process, flattens the overlapping parts of the cells to increase the contact area between the solder strip and the cells, thereby reducing the pressure of the solder strip on the cells. The EL image of the component after the process optimization shows that the problem of cell fragments and hidden cracks has been significantly improved. After repeated experiments and debugging, only a small amount of hidden cracks and fragments exist on the edge.

[0084] In order to avoid the impact of hidden cracks and fragments on the power of the component, the present embodiment can also design micro-pitch parameters. By controlling the gap between the cells within a smaller micro-pitch, and through the detected EL image, it is ensured that there are no hidden cracks and fragments in the cell. Through repeated experiments, the cell gap is adjusted. On the basis of ensuring that there are no hidden cracks and fragments in the cell, the cell micro-gap can be set to 1mm (i.e., the preset distance) in combination with actual needs. Thereby, the purpose of improving component efficiency and reducing the amount of packaging materials can be achieved.

[0085] It should be noted that, in this embodiment, the design methods of the above two series spacings can be determined according to actual needs, and one of them is selected as the final design parameter, and this application does not impose any restrictions on this.

[0086] Therefore, for the design of the module layout parameters, based on the simulation analysis experiment of 210-20BB batteries, the effects of welding ribbons and different gap battery arrangements on module power and fragmentation were analyzed. The experimental results show that among the welding ribbons within the research range, 0.32mm round wire welding ribbons with 210-20BB modules can provide the maximum module power. The negative spacing arrangement method has a greater damage to the 130um thin-film heterojunction battery, which is prone to fragmentation and hidden cracking. The 1mm micro-pitch can effectively reduce the battery cell gap and improve the packaging density without affecting the hidden crack fragments. Therefore, the design results of the layout parameters of 0.32mm round wire welding ribbons and 1mm micro-pitch arrangements can be obtained.

[0087] In summary, the design method of the layout parameters of the HJT battery assembly based on simulation in the embodiment of the present application first obtains the size of the HJT battery to be processed and the multiple main grid designs to be selected as the input parameters of the simulation; then the input parameters are input into the solar cell simulation application, and the number of sub-grids selected under each main grid design is simulated and analyzed in the simulation application to determine the multiple battery electrode parameters when the battery efficiency reaches the peak under each main grid design, including the number of front and back sub-grids; then the target grid design is determined by comparing the battery performance corresponding to the multiple battery electrode parameters under each main grid design; finally, based on the multiple battery electrode parameters under the target grid design, the welding strip parameters and the battery cell series spacing in the assembly that match the target grid design are determined. Thus, the method simulates a variety of main grid technologies, and the number of front and back sub-grids that can effectively improve the battery efficiency can be obtained through simulation analysis, and then the layout parameters of the HJT battery assembly after the grid setting is completed are determined from the two aspects of assembly power and packaging density. Based on the obtained layout parameters, the efficiency of the battery assembly can be further improved. Therefore, this method can obtain the component layout parameters that effectively improve the efficiency of the battery component through simulation analysis, optimize the grid line current collection capacity, and reduce the cost of parameter design through simulation design, thereby improving the rationality and convenience of component parameter design and improving the efficiency of the HJT battery component.

[0088] In order to implement the above embodiment, the present application also proposes a design system for HJT battery assembly template parameters based on simulation. Fig. 9 A structural diagram of a design system for HJT battery assembly template parameters based on simulation proposed in an embodiment of the present application is shown in FIG. Fig. 9 As shown, the system includes:

[0089] The acquisition module 100 is used to acquire the size of the HJT battery to be processed and multiple busbar designs to be selected, and determine the input parameters of the simulation based on the size and the multiple busbar designs to be selected.

[0090] The simulation module 200 is used to input the input parameters into the solar cell simulation application, and in the simulation application, the number of sub-grids selected under each main grid line design is simulated and analyzed to determine multiple battery electrode parameters when the battery efficiency reaches a peak under each main grid line design. The multiple battery electrode parameters include the number of front sub-grids and the number of back sub-grids.

[0091] The comparison module 300 is used to determine a target busbar design by comparing the battery performance corresponding to a plurality of battery electrode parameters under various busbar designs.

[0092] The determination module 400 is used to determine the welding strip parameters and the battery cell series connection spacing in the component that match the target grid line design based on multiple battery electrode parameters under the target grid line design.

[0093] Optionally, in one embodiment of the present application, the simulation module 200 is specifically used to: for any main grid line design, determine the welding points set on each main grid line, and fix the number of back side sub-grids; within a preset range of the number of first grid lines, simulate the HJT battery efficiency under different numbers of front side sub-grids, and determine the corresponding relationship curve between the battery efficiency and the number of front side sub-grids; determine the number of front side sub-grids corresponding to the maximum battery efficiency according to the corresponding relationship curve.

[0094] Optionally, in one embodiment of the present application, the simulation module 200 is specifically used to: simulate the open circuit voltage, fill factor FF and short circuit current Jsc of the HJT battery under different numbers of front sub-grids, and determine the changing trends of the open circuit voltage, fill factor and short circuit current as the number of front sub-grids increases; determine the number of front sub-grids corresponding to the maximum battery efficiency based on the changing trend of the fill factor.

[0095] Optionally, in one embodiment of the present application, the simulation module 200 is specifically used to: use the number of front sub-grids corresponding to the maximum battery efficiency as a fixed number of front sub-grids, and within a preset range of the number of second grid lines, simulate the open circuit voltage, fill factor FF, short circuit current Jsc and battery efficiency of the HJT battery under different numbers of back sub-grids, and respectively determine the changing trends of the fill factor and battery efficiency with the increase of the number of back sub-grids; determine the number of back sub-grids corresponding to the maximum battery efficiency in combination with the changing trend of the fill factor, the changing trend of the battery efficiency and the screen printing process.

[0096] Optionally, in one embodiment of the present application, the comparison module 300 is specifically used to: set the number of front and back sub-grids of the battery under each main grid line design according to the number of front sub-grids and the number of back sub-grids obtained by simulation analysis, and detect multiple battery electrical performance parameters under each main grid line design after the sub-grids are set; and select a target main grid line design from multiple main grid line designs in combination with multiple battery electrical performance parameters and shading conditions.

[0097] Optionally, in one embodiment of the present application, the determination module 400 is specifically used to: set the gate lines of the HJT battery assembly according to the target gate line design, and calculate the maximum power of the HJT battery assembly after the gate lines are set under different diameters of solder strips, and use the solder strip diameter corresponding to the maximum value of each maximum power as the solder strip parameter matching the target gate line design.

[0098] Optionally, in one embodiment of the present application, the determination module 400 is specifically used to: overlap partial areas of two battery cells connected in series in the HJT battery assembly, and expand the contact area between the welding strip and the battery cell by flattening the overlapping area; or, perform electroluminescence detection EL on the edge areas of the two battery cells connected in series, with the goal of ensuring that there are no hidden cracks and fragments in the edge areas of the EL image, and adjust the spacing between the two battery cells connected in series to within a preset distance.

[0099] It should be noted that the aforementioned explanation of the embodiment of the method for designing the layout parameters of the HJT battery module based on simulation is also applicable to the system of this embodiment and will not be repeated here.

[0100] In summary, the design system of the HJT battery assembly template parameters based on simulation in the embodiment of the present application simulates a variety of main grid technologies, and can obtain the number of front and back sub-grids that effectively improve the efficiency of the battery through simulation analysis, and then determine the template parameters of the HJT battery assembly after the grid line is set from the two aspects of component power and packaging density. Based on the obtained template parameters, the efficiency of the battery assembly can be further improved. Therefore, the system can obtain the component template parameters that effectively improve the efficiency of the battery assembly through simulation analysis, optimize the current collection capacity of the grid line, and reduce the cost of parameter design through simulation design, improve the rationality and convenience of component parameter design, and improve the efficiency of the HJT battery assembly.

[0101] In order to implement the above-mentioned embodiments, the present application also proposes a non-temporary computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, it implements the design method of HJT battery component layout parameters based on simulation as described in any one of the above-mentioned first aspect embodiments.

[0102] In the description of this specification, 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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 method for designing HJT battery assembly template parameters based on simulation, characterized in that: The following steps are involved: Obtaining the size of the HJT battery to be processed and a plurality of busbar designs to be selected, and determining input parameters of the simulation based on the size and the plurality of busbar designs to be selected; Input the input parameters into a solar cell simulation application, and perform simulation analysis on the number of sub-grids selected under each of the main grid lines in the simulation application to determine multiple battery electrode parameters when the battery efficiency reaches a peak under each of the main grid lines, wherein the multiple battery electrode parameters include the number of front sub-grids and the number of back sub-grids; Determine a target busbar design by comparing the battery performance corresponding to the plurality of battery electrode parameters under each of the busbar designs; Based on a plurality of battery electrode parameters under the target grid line design, the welding strip parameters and the battery cell series connection spacing in the assembly matching the target grid line design are determined.

2. The design method according to claim 1, characterized in that: The determining of a plurality of battery electrode parameters when the battery efficiency reaches a peak value under each busbar design comprises: For any busbar design, determine the welding points set on each busbar and set the number of back sub-grids fixedly; Within the preset range of the number of first grid lines, simulate the HJT cell efficiency under different numbers of front sub-grids, and determine the corresponding relationship curve between the cell efficiency and the number of front sub-grids; The number of front sub-grids corresponding to the maximum battery efficiency is determined according to the corresponding relationship curve.

3. The design method according to claim 2, characterized in that: After simulating the HJT cell efficiency under different numbers of front sub-grids, the method further includes: The open circuit voltage, fill factor FF and short circuit current Jsc of the HJT battery under different numbers of front auxiliary grids are simulated to determine the change trends of the open circuit voltage, the fill factor and the short circuit current as the number of front auxiliary grids increases; The number of front sub-grids corresponding to the maximum battery efficiency is determined in combination with the change trend of the fill factor.

4. The design method according to claim 2, characterized in that: After determining the number of front sub-grids corresponding to the maximum battery efficiency according to the corresponding relationship curve, the method further includes: The number of front sub-grids corresponding to the maximum value of the battery efficiency is set as the fixed number of front sub-grids, and within the preset range of the number of second grid lines, the open circuit voltage, fill factor FF, short circuit current Jsc and battery efficiency of the HJT battery under different numbers of back sub-grids are simulated to determine the change trends of the fill factor and the battery efficiency with the increase of the number of back sub-grids; The number of back sub-grids corresponding to the maximum value of the battery efficiency is determined by combining the change trend of the fill factor, the change trend of the battery efficiency and the screen printing process.

5. The design method according to claim 1, characterized in that: The step of comparing the battery performances corresponding to the multiple battery electrode parameters of the busbar designs to determine the target busbar design comprises: According to the number of front and back sub-grids obtained by simulation analysis, the number of front and back sub-grids of the battery under each busbar design is set, and after the sub-grids are set, multiple battery electrical performance parameters under each busbar design are detected; In combination with the plurality of battery electrical performance parameters and shading conditions, a target busbar design is selected from the plurality of busbar designs.

6. The design method according to claim 1, characterized in that: The step of determining the welding strip parameters matching the target grid line design includes: The gate lines of the HJT battery assembly are set according to the target gate line design, and the maximum power of the HJT battery assembly after the gate lines are set under welding strips of different diameters is calculated, and the welding strip diameter corresponding to the maximum value of each of the maximum powers is used as the welding strip parameter matching the target gate line design.

7. The design method according to claim 6, characterized in that: Determining the series connection spacing of the battery cells in the assembly includes: Overlapping parts of two battery cells connected in series in an HJT battery module and expanding the contact area between the welding ribbon and the battery cell by flattening the overlapping area; or, Electroluminescence detection EL is performed on the edge areas of the two battery cells connected in series, and the distance between the two battery cells connected in series is adjusted to a preset distance with the goal of ensuring that there are no hidden cracks and fragments in the edge areas in the EL image.

8. A design system for HJT battery assembly template parameters based on simulation, characterized in that: include: An acquisition module, used for acquiring the size of the HJT battery to be processed and a plurality of busbar designs to be selected, and determining input parameters of the simulation based on the size and the plurality of busbar designs to be selected; A simulation module, used for inputting the input parameters into a solar cell simulation application, in which the number of sub-grids selected under each of the busbar designs is respectively simulated and analyzed to determine a plurality of battery electrode parameters when the battery efficiency reaches a peak under each of the busbar designs, wherein the plurality of battery electrode parameters include the number of front sub-grids and the number of back sub-grids; A comparison module, configured to determine a target busbar design by comparing the battery performance corresponding to the plurality of battery electrode parameters under each busbar design; The determination module is used to determine the welding strip parameters and the battery cell series connection spacing in the component that match the target grid line design based on multiple battery electrode parameters under the target grid line design.

9. The design system according to claim 8, characterized in that: The simulation module is specifically used for: For any busbar design, determine the welding points set on each busbar and set the number of back sub-grids fixedly; Within the preset range of the number of first grid lines, simulate the HJT cell efficiency under different numbers of front sub-grids, and determine the corresponding relationship curve between the cell efficiency and the number of front sub-grids; The number of front sub-grids corresponding to the maximum battery efficiency is determined according to the corresponding relationship curve.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for designing the layout parameters of an HJT battery assembly based on simulation as described in any one of claims 1 to 7 is implemented.

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