Photovoltaic series welding machine and heating source design method of photovoltaic series welding machine

Abstract

The invention provides a photovoltaic series welding machine and a heating source design method of the photovoltaic series welding machine. Each group of first battery pieces of the photovoltaic series welding machine has a first total width. The first total width comprises the sum of the first widths of all the first battery pieces in each group of first battery pieces and the sum of the distances of the first battery pieces between every two adjacent first battery pieces, and each group of second battery pieces has a second total width; the second total width comprises the sum of the second widths of all the second battery pieces in each group of second battery pieces and the sum of the distances between the second battery pieces between every two adjacent second battery pieces; the total width of the heating source is the larger one of the first total width comparison value and the second total width comparison value. According to the photovoltaic series welding machine, series welding can be carried out on battery pieces in different slicing modes, and the flexibility of the photovoltaic series welding machine is improved.

Description

Technical Field

[0001] This application mainly relates to the field of battery technology, and in particular to a photovoltaic string welding machine and a method for designing a heating source for the photovoltaic string welding machine. Background Technology

[0002] Currently, the stringing of photovoltaic cells is typically achieved using short-wave infrared quartz lamps for heating. A quartz lamp consists of a tungsten filament inserted into a gas-filled quartz tube. Under the influence of alternating current, the tungsten filament heats up, heating the gas inside the quartz tube, thus generating infrared radiation. Short-wave infrared quartz lamps have an extremely wide wavelength range. According to the theory of radiation absorption, the infrared radiation wavelength resonates with the material, generating heat. The visible light portion of the infrared radiation is almost entirely ineffective as heat energy. In other words, the light utilization rate of quartz lamps for stringing is relatively low, resulting in relatively high energy consumption. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide a photovoltaic stringer and a heating source design method for the photovoltaic stringer, which can string-weld solar cells with different slicing methods, thereby improving the flexibility of the photovoltaic stringer.

[0004] To address the aforementioned technical problems, this application provides a photovoltaic stringing machine, including a heating source adapted to heat solar cells. Each solar cell comprises one or more groups of first solar cells and one or more groups of second solar cells. Each group of first solar cells includes multiple first solar cells. Each first solar cell has a first width in the stringing direction. A first spacing exists between each pair of adjacent first solar cells in each group. Each group of first solar cells has a first total width, which includes the sum of the first widths of all first solar cells in each group and the sum of the first spacings between each pair of adjacent first solar cells. The maximum value of the first total width in the one or more groups of first solar cells is the first total width. Width comparison value; each group of second battery cells includes multiple second battery cells, the second battery cells having a second width different from the first width in the stringing direction, and a second battery cell spacing between each two adjacent second battery cells in each group, wherein each group of second battery cells has a second total width, the second total width including the sum of the second widths of all second battery cells in each group and the sum of the second battery cell spacings between each two adjacent second battery cells, the maximum value of the second total width in one or more groups of second battery cells is the second total width comparison value; and the heating source has a total heating source width, the total heating source width being the larger of the first total width comparison value and the second total width comparison value.

[0005] Optionally, when the solar cell is the first solar cell, each group of first solar cells includes a first first solar cell and a last first solar cell, wherein when the photovoltaic stringer heats multiple groups of first solar cells, there is a first inter-group spacing between the last first solar cell of the previous group of first solar cells and the first first solar cell of the next group of first solar cells; when the solar cell is the second solar cell, each group of second solar cells includes a first second solar cell and a last second solar cell, wherein when the photovoltaic stringer has multiple groups of second solar cells, there is a second inter-group spacing between the last second solar cell of the previous group of second solar cells and the second first solar cell of the next group of second solar cells, wherein the first total width also includes the sum of all the first inter-group spacings, and the second total width also includes the sum of all the second inter-group spacings.

[0006] Optionally, the first battery cell includes a battery cell obtained by cutting a complete battery cell in half, and the first total width comparison value L1 is calculated according to the following formula:

[0007]

[0008] Where L1 is the first total width comparison value, L 11 Let be the width of a complete battery cell in each group of first battery cells, 'a' be the number of first battery cells in each group of first battery cells, 'm' be the spacing between the first battery cells, and 'n' be the spacing between the first groups.

[0009] Optionally, the second battery cell includes a battery cell obtained by cutting a complete battery cell into three equal parts, and the second total width comparison value L2 is calculated according to the following formula:

[0010]

[0011] Where L2 is the second total width comparison value, L 22 b is the width of a complete battery cell in each group of second battery cells, p is the number of second battery cells in each group of second battery cells, and q is the spacing between the second battery cells.

[0012] Optionally, the heating source includes multiple light boxes, each of which includes one or more LED heating sources.

[0013] Optionally, when each of the light boxes includes multiple LED heating sources, the multiple LED heating sources are arranged in a dot matrix.

[0014] Optionally, the photovoltaic stringer also includes a control center adapted to control the on and off of the one or more LED heating sources in each of the light boxes.

[0015] Optionally, the heating source includes a heating head, an electrical control cabinet, and a cooling device. The heating head is adapted to heat the first battery cell and / or the second battery cell. The electrical control cabinet is adapted to control the power of the heating source to control the heating temperature of the heating source. The cooling device is adapted to cool the heating source.

[0016] Optionally, the photovoltaic string welding machine further includes an alloy pressure plate adapted to compact the solar cells in the photovoltaic string welding machine, wherein the plurality of first solar cells and / or the plurality of second solar cells are configured to have welding ribbons, and the heating band of the heating source is determined according to the welding ribbon band absorptivity, the alloy pressure plate band absorptivity, and the solar cell band absorptivity.

[0017] Optionally, when the heating source includes multiple light boxes having one or more LED heating sources, at least a portion of the LED heating sources have a heating wavelength of 850nm to 1000nm.

[0018] To address the aforementioned technical problems, this application provides a heating source design method for a photovoltaic string welder, applicable to the photovoltaic string welder described above, comprising the following steps: calculating a first total width comparison value for a first solar cell; calculating a second total width comparison value for a second solar cell; and setting the larger of the first total width comparison value and the second total width comparison value as the total width of the heating source.

[0019] Optionally, the photovoltaic stringer includes an alloy pressure plate adapted to compact the solar cells in the photovoltaic stringer, wherein the plurality of first solar cells and / or the plurality of second solar cells are configured to have welding ribbons, and the heating source design method further includes: obtaining the welding ribbon wavelength absorption rate, the alloy pressure plate wavelength absorption rate, and the solar cell wavelength absorption rate; and determining the heating wavelength of the heating source based on the welding ribbon wavelength absorption rate, the alloy pressure plate wavelength absorption rate, and the solar cell wavelength absorption rate.

[0020] Compared with the prior art, this application determines the total width of the heating source by using the width of the first and second battery cells, so that the heating source of the stringer can meet the stringing requirements of different battery cells and improve the flexibility of the whole machine; furthermore, this application can improve the light utilization rate by using an LED heating source to string the battery cells. Attached Figure Description

[0021] The accompanying drawings are included to provide a further understanding of this application; they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of this application and, together with this specification, serve to explain the principles of this application. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the first solar cell in a photovoltaic string welding machine according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the second solar cell in a photovoltaic string welding machine according to one embodiment of this application;

[0024] Figure 3 This is a schematic diagram of the structure of a heating source in a photovoltaic string welding machine according to one embodiment of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the lamp box in a photovoltaic string welding machine according to one embodiment of this application;

[0026] Figure 5 This is a partial structural schematic diagram of the lamp box in a photovoltaic string welding machine according to one embodiment of this application;

[0027] Figures 6-7 This is a top view of a photovoltaic string welding machine in a working state according to an embodiment of this application;

[0028] Figure 8 This is a waveform absorptivity curve of the LED heating source in a photovoltaic string welding machine according to one embodiment of this application;

[0029] Figure 9 This is a flowchart illustrating a heating source design method for a photovoltaic string welding machine according to one embodiment of this application. Detailed Implementation

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0031] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0033] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0034] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0036] This application refers to Figures 1-5 A partial structure of a photovoltaic stringer 10 (hereinafter referred to as "stringer 10") is shown, wherein, Figure 1 This is a schematic diagram of the structure of the first solar cell 200 in the stringer 10. Figure 2 This is a schematic diagram of the structure of the second solar cell 300 in the photovoltaic string welding machine 10. Figure 3 This is a schematic diagram of the heating source 101 in the string welding machine 10. Figure 4 This is a structural schematic diagram of the lamp box 104 in the string welding machine 10. Figure 5 This is a partial structural diagram of the lamp box 104 in the string welding machine 10.

[0037] In this embodiment, the stringer 10 includes a heating source 101, which is adapted to heat the battery cell 100. The battery cell 100 includes multiple sets of first battery cells 102 and multiple sets of second battery cells 103.

[0038] Specifically, refer to Figure 1 Each group of first battery cells 102 includes multiple first battery cells 200. Each first battery cell 200 has a first width w1 in the stringing direction x. Each pair of adjacent first battery cells 200 in each group has a first battery cell spacing m. Each group of first battery cells 102 includes a first first battery cell 201 and a last first battery cell 202. In this embodiment, the stringing machine 10 includes multiple groups of first battery cells 200; therefore, there is a first inter-group spacing n between the last first battery cell 202 of the previous group and the first first battery cell 201 of the next group.

[0039] Furthermore, each group of first solar cells 200 has a first total width, which includes the sum of the first widths w1 of all first solar cells 200 in each group, the sum of the first cell spacing m between any two adjacent first solar cells 200, and the sum of the spacing n between all first groups. For example, the first solar cells 200 can be solar cells of different sizes, and different sizes of solar cells have different first total widths. Therefore, the maximum value of the first total width w1 among multiple groups of first solar cells 200 is... max1 The first total width comparison value is L1.

[0040] In this preferred embodiment, the first battery cell 200 includes a battery cell obtained by cutting a complete battery cell 100 in half, and the first total width comparison value L1 is calculated according to the following formula:

[0041]

[0042] Where L1 is the first total width comparison value, L 11 Let 'a' be the width of a complete cell 100 within each group of first cells 200, 'm' be the number of first cells 200 in each group, 'm' be the spacing between the first cells, and 'n' be the spacing between the first groups. For example,... Figure 2 In the battery cells shown, L 11 Given 210mm, m = 0.8mm, n = 24mm, and a = 4, then at this time...

[0043] For example, in other embodiments of this application, the stringer 10 may include only one group of first battery cells 200. In this case, the first total width of the first battery cells 200 includes the sum of the first widths w1 of all the first battery cells 200 in each group of first battery cells 200, and the sum of the first battery cell spacing m between each pair of adjacent first battery cells 200. This application is not limited thereto.

[0044] On the other hand, refer to Figure 2 Each group of second battery cells 103 includes multiple second battery cells 300. The second battery cells 300 have a second width w2 in the stringing direction x that is different from the first width w1. There is a second battery cell spacing p between each two adjacent second battery cells 300 in each group of second battery cells 300. Each group of second battery cells 300 includes a first second battery cell 301 and a last second battery cell 302. When there are multiple groups of second battery cells 300 in the stringing machine 10, there is a second inter-group spacing q between the last second battery cell 302 of the previous group of second battery cells 300 and the second first battery cell 301 of the next group of second battery cells 300.

[0045] Furthermore, each group of second solar cells 300 has a second total width, which includes the sum of the second widths w2 of all second solar cells 300 in each group, the sum of the spacing p between any two adjacent second solar cells 300, and the sum of the spacing q between all second groups. For example, the second solar cells 300 can be solar cells of different sizes, and different sizes of solar cells have different second total widths; therefore, the maximum value w2 of the second total width among multiple groups of second solar cells 300 is... max2 This is the second total width comparison value, L2.

[0046] In this preferred embodiment, the second battery cell includes a battery cell obtained by cutting a complete battery cell into three equal parts, and the second total width comparison value L2 is calculated according to the following formula:

[0047]

[0048] Where L2 is the second total width comparison value, L 22 Let be the width of a complete cell in each group of second cells, b be the number of second cells in each group, p be the spacing between the second cells, and q be the spacing between the second groups. For example, Figure 3 In the battery cells shown, L 22 Given a diameter of 210mm, p = 0.4mm, q = 12mm, and b = 6, then at this time...

[0049] For example, in other embodiments of this application, the stringer 10 may include only one set of second group of battery cells 300. In this case, the second total width of the second battery cells 300 includes the sum of the second widths w2 of all the second battery cells 300 in each set of second battery cells 300 and the sum of the second battery cell spacing p between each two adjacent second battery cells 300. This application is not limited thereto.

[0050] Reference Figures 3-5 The heating source 101 has a total width L0, which is the larger of a first total width comparison value L1 and a second total width comparison value L2. This embodiment is preferred, and more clearly can be seen from... Figure 4 The heating source 101 includes multiple light boxes 104, and each light box 104 includes multiple LED heating sources 105. Figure 4 The structure of a portion of the lamp box 104 within the heating source 101 is shown. Further reference... Figure 5Multiple LED heating sources 105 are arranged in a dot matrix within the light box 104. LED is an abbreviation for Light Emitting Diode, a solid-state semiconductor cold light source. It is an optoelectronic device that uses a PN junction made of semiconductor compound materials. Its light-emitting principle is as follows: when electrons and holes recombine within the PN junction, the electrons transition from a high energy level to a low energy level, releasing excess energy as photons (electromagnetic waves), thus producing electroluminescence. Since the color of light is determined by wavelength, the color of the LED heating source 105 depends on its wavelength, which is determined by the material forming the PN junction. This is the principle behind why LED chips can emit various colors of light. The infrared LED heating source is based on GaAs semiconductor material. The LED heating source 105 is used to heat and weld the battery cells. Compared to quartz lamps, its wavelength is relatively concentrated, with infrared light accounting for nearly 100%. Therefore, the preferred LED heating source in this application is an infrared LED heating source.

[0051] In other embodiments of this application, depending on actual operational needs, each light box 104 may also include only one LED heating source 105, and this application is not limited thereto. When the battery cell 100 is the first battery cell 200, the width f of each light box 104 must satisfy the width L0 / 2 / x of the heating source 101 ≈ an integer; when the battery cell 100 is the second battery cell 300, the width f of each light box 104 must satisfy the width L0 / 3 / x of the heating source 101 ≈ an integer.

[0052] On the other hand, the stringer 10 also includes a control center (not shown), which is adapted to control the on and off of the LED heating source 105 in each light box 104. Furthermore, the heating source 101 also includes a heating head (not shown), an electrical control cabinet (not shown), and a cooling device (not shown). The heating head is adapted to heat the first battery cell 200 and / or the second battery cell 300, the electrical control cabinet is adapted to control the power of the heating source 101 to control the heating temperature of the heating source, and the cooling device is adapted to cool the heating source 101.

[0053] In a preferred embodiment, the stringer 10 further includes a conveyor belt (not shown) located below the heating source 101, with the battery cells 100 placed on the conveyor belt. When multiple sets of battery cells 100 (including the aforementioned first battery cell 200 or second battery cell 300) are present, the conveyor belt first transports one set of battery cells 100 to the area below the heating source 101. After one set of battery cells 100 has been heated, the conveyor belt then transports the next set of battery cells 100 to the area below the heating source 101, whereby the heating source 101 heats the next set of battery cells 100. This heating process continues in this manner.

[0054] Reference Figure 6 , Figure 6 A top view is shown of the stringer 10 heating the first group of first solar cells 200. (See diagram below.) Figure 6 As shown, the conveyor belt transports the first group of first battery cells 200 to below the heating source 101. At this time, the length range of the heating source 101 corresponding to the first battery cell 200 to be heated is w11, and the length range corresponding to the first group spacing n is w22. The control center controls the light box 104 in the heating source 101 within the range of w11 to turn on, and controls the light box within the range of w22 to turn off, so that the heating source 101 can heat the first group of first battery cells 200.

[0055] Reference Figure 7 , Figure 7 A top view is shown of the stringer 10 heating the first group of second solar cells 300. (See diagram below.) Figure 7 As shown, the conveyor belt transports the first group of second battery cells 300 to below the heating source 101. At this time, the length range of the heating source 101 corresponding to the first group of second battery cells 300 to be heated is w33, and the length range corresponding to the spacing q between the second groups is w44. The control center controls the light box 104 in the heating source 101 within the range of w22 to turn on, and controls the light box within the range of w44 to turn off, so that the heating source 101 can heat the first group of second battery cells 200. In this embodiment, the first total width comparison value L1 is greater than the second total width comparison value L2. Therefore, the width of the heating source 101 is the first total width comparison value L1. So when the heating source 101 heats the second battery cell 200, there is still a part of the light box with a length of w55 corresponding to the second group of second battery cells 300 to be heated. At this time, the control center controls the light box 104 corresponding to the second group of second battery cells 300 to be heated within the range of w55 to turn off. After the first group of second battery cells 300 is heated, the conveyor belt transports the second group of second battery cells 300 to the length range of w33, so that the heating source 101 can start heating the second group of second battery cells 300. The heating process is repeated in this way.

[0056] In a preferred embodiment, the string welding machine 10 further includes an alloy pressure plate (not shown). Multiple first solar cells 200 and / or multiple second solar cells 300 are configured with solder strips (not shown). The alloy pressure plate is adapted to compact the solar cells 100 in the string welding machine 10, so that the solder strips on the solar cells 100 can make full contact with the solder, further improving the welding effect. The heating band of the heating source 101 is determined based on the solder strip band absorptivity, the alloy pressure plate band absorptivity, and the solar cell band absorptivity.

[0057] like Figure 8As shown, curve c represents the absorptivity of the solder ribbon, curve d represents the absorptivity of the alloy platen, and curve e represents the absorptivity of the solar cell. The fitting process for curve c involves first calculating the reflectivity and transmittance of the solder ribbon, and then calculating the absorptivity using these values. The fitting processes for curves d and e are the same as for curve c, and will not be elaborated upon here.

[0058] In this embodiment, a higher solder ribbon wavelength absorptivity indicates better heat absorption by the solder ribbon, resulting in better welding performance. Therefore, a higher solder ribbon wavelength absorptivity is more beneficial for welding the solar cell 100. Similarly, a higher solar cell wavelength absorptivity indicates better heat absorption by the solar cell, resulting in better welding performance. Therefore, a higher solar cell wavelength absorptivity is more beneficial for welding the solar cell 100. In this embodiment, the alloy pressure plate covers 20% of the area of ​​the solar cell 100. When heating the solar cell 100, it is undesirable for the alloy pressure plate to absorb excessive heating energy; therefore, a lower alloy pressure plate wavelength absorptivity is better.

[0059] Reference Figure 8 It can be seen that the cell absorption rate of the battery cell 100 is relatively high in the wavelength range of less than 1000nm, while the absorption rate of the alloy plate of the alloy plate is significantly reduced in the wavelength range of 850-1000nm. In addition, the absorption rate of the solder ribbon is relatively stable in the wavelength range of 850-1000nm. Therefore, in this embodiment, the heating wavelength of the LED heating source 105 in the heating source 101 is preferably 850nm-1000nm, which is beneficial to reducing the overall energy consumption of the device.

[0060] This application also refers to Figure 9 A heating source design method 20 is proposed, applicable to the photovoltaic string welder proposed in any embodiment of this application, such as the photovoltaic string welder 10 described above. Flowcharts are used in this application to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed precisely in sequence. Instead, various steps can be processed in reverse order or simultaneously. Simultaneously, other operations may be added to these processes, or one or more steps may be removed from these processes.

[0061] The heating source design method 20 includes the following steps: S1: Calculate the first total width comparison value of the first battery cell; S2: Calculate the second total width comparison value of the second battery cell; S3: Set the larger of the first total width comparison value and the second total width comparison value as the total width of the heating source.

[0062] This application determines the total width of the heating source by using the width of the first and second solar cells, enabling the heating source of the stringer to meet the stringing requirements of different solar cells, improving the overall flexibility of the machine, reducing management costs, and lowering the cost of switching heat sources in the workshop. Furthermore, by using LED heating sources to string the solar cells, this application can improve light utilization. Using a wavelength of 850-1000nm to heat the solar cells can reduce the overall energy consumption of the machine while ensuring strong heating capacity. On the other hand, the LED heating sources are arranged in a dot matrix, so when one heating source fails, it is not necessary to stop the machine to replace all the light sources, which can save management costs. Moreover, the lifespan of the LED heating sources is longer, making equipment operation and maintenance more convenient.

[0063] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0064] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0065] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0066] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0067] Although this application has been described with reference to specific embodiments, those skilled in the art should recognize that the above embodiments are only used to illustrate this application, and various equivalent changes or substitutions can be made without departing from the spirit of this application. Therefore, any changes or modifications to the above embodiments within the essential spirit of this application will fall within the scope of the claims of this application.

Claims

1. A photovoltaic string welding machine, characterized in that, The system includes a heating source adapted to heat battery cells, the battery cells comprising one or more sets of first battery cells and one or more sets of second battery cells, wherein... Each group of first battery cells includes multiple first battery cells, each first battery cell having a first width in the stringing direction, and each group of first battery cells having a first battery cell spacing between each two adjacent first battery cells, wherein each group of first battery cells has a first total width, the first total width including the sum of the first widths of all first battery cells in each group of first battery cells and the sum of the first battery cell spacings between each two adjacent first battery cells, and the maximum value of the first total width in one or more groups of first battery cells is a first total width comparison value; Each group of second battery cells includes multiple second battery cells, each second battery cell having a second width different from the first width in the stringing direction. A second battery cell spacing exists between each pair of adjacent second battery cells in each group. Each group of second battery cells has a second total width, which includes the sum of the second widths of all second battery cells in each group and the sum of the second battery cell spacings between each pair of adjacent second battery cells. The maximum value of the second total width in one or more groups of second battery cells is a second total width comparison value. The heating source has a total width, which is the larger of the first total width comparison value and the second total width comparison value.

2. The photovoltaic string welding machine as described in claim 1, characterized in that, When the solar cell is the first solar cell, each group of the first solar cells includes a first first solar cell and a last first solar cell. When the photovoltaic string welding machine heats multiple groups of the first solar cells, there is a first inter-group spacing between the last first solar cell of the previous group of the first solar cells and the first first solar cell of the next group of the first solar cells. When the solar cell is the second type, each group of second solar cells includes a first second solar cell and a last second solar cell. When the photovoltaic stringer has multiple groups of second solar cells, there is a second inter-group spacing between the last second solar cell of the previous group and the first second solar cell of the next group. The first total width also includes the sum of all the spacing between the first groups, and the second total width also includes the sum of all the spacing between the second groups.

3. The photovoltaic string welding machine as described in claim 2, characterized in that, The first battery cell includes a battery cell obtained by cutting a complete battery cell in half, and the first total width comparison value L1 is calculated according to the following formula: Where L1 is the first total width comparison value, L 11 Let be the width of a complete battery cell in each group of first battery cells, 'a' be the number of first battery cells in each group of first battery cells, 'm' be the spacing between the first battery cells, and 'n' be the spacing between the first groups.

4. The photovoltaic string welding machine as described in claim 2, characterized in that, The second battery cell includes a battery cell obtained by cutting a complete battery cell into three equal parts, and the second total width comparison value L2 is calculated according to the following formula: Where L2 is the second total width comparison value, L 22 b is the width of a complete battery cell in each group of second battery cells, p is the number of second battery cells in each group of second battery cells, and q is the spacing between the second battery cells.

5. The photovoltaic string welding machine as described in claim 1, characterized in that, The heating source includes multiple light boxes, and each light box includes one or more LED heating sources.

6. The photovoltaic string welding machine as described in claim 5, characterized in that, When each of the light boxes includes multiple LED heating sources, the multiple LED heating sources are arranged in a dot matrix manner.

7. The photovoltaic string welding machine as described in claim 5, characterized in that, It also includes a control center adapted to control the on and off of the one or more LED heating sources in each of the light boxes.

8. The photovoltaic string welding machine as described in claim 5, characterized in that, The heating source includes a heating head, an electrical control cabinet, and a cooling device. The heating head is adapted to heat the first battery cell and / or the second battery cell. The electrical control cabinet is adapted to control the power of the heating source to control the heating temperature of the heating source. The cooling device is adapted to cool the heating source.

9. The photovoltaic string welding machine according to any one of claims 1 to 8, characterized in that, It also includes an alloy pressure plate adapted to compact the solar cells in the photovoltaic stringer, wherein the plurality of first solar cells and / or the plurality of second solar cells are configured to have solder ribbons, and the heating band of the heating source is determined based on the solder ribbon band absorptivity, the alloy pressure plate band absorptivity, and the solar cell band absorptivity.

10. The photovoltaic string welding machine as described in claim 9, characterized in that, When the heating source includes multiple light boxes having one or more LED heating sources, at least a portion of the LED heating sources have a heating wavelength of 850nm to 1000nm.

11. A heating source design method for a photovoltaic string welding machine, applicable to the photovoltaic string welding machine as described in any one of claims 1 to 10, characterized in that, Includes the following steps: Calculate the first total width comparison value of the first solar cell; Calculate the second total width comparison value of the second solar cell; and The larger of the first total width comparison value and the second total width comparison value is set as the total width of the heating source.

12. The heating source design method as described in claim 11, characterized in that, The photovoltaic string welding machine includes an alloy pressure plate adapted to compact the solar cells in the photovoltaic string welding machine, wherein the plurality of first solar cells and / or the plurality of second solar cells are configured to have welding strips, and the heating source design method further includes: Obtain the absorptivity of the solder ribbon, the absorptivity of the alloy plate, and the absorptivity of the battery cell; and The heating band of the heating source is determined based on the absorption rate of the welding strip, the absorption rate of the alloy pressure plate, and the absorption rate of the battery cell.

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