Photovoltaic module welding repair device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-04
- Publication Date
- 2026-08-14
AI Technical Summary
然而，传统的虚焊返修工艺复杂，影响组件生产效率
[0018]上述光伏组件焊接修复装置中，第一移动支架和第二移动支架用于分别设置在电池片的两侧边（可以是长边或短边），导轨架设在第一移动支架和第二移动支架上，位于电池片的上方，热辐射机构设置在导轨上，热辐射机构通过辐射加热使光伏组件的待焊接修复区域表面及内部升温到焊接温度，能够促使该区域的焊带与电池片之间的焊料再次熔化，进而与电池片表面的栅线进行二次焊接并形成合金，打通电流从电池片到焊带的传输路径，修复EL发黑的缺陷。第一移动支架和第二移动支架移动能够调节热辐射机构在第一方向上的位置，热辐射机构沿导轨移动能够调节其在第二方向上的位置，从而能够对光伏组件整面任何位置进行修复。上述光伏组件焊接修复装置使用操作简单，成本较低且安全可靠。
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Figure CN224630104U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic module welding repair device. Background Technology
[0002] The production process of photovoltaic (PV) modules typically includes steps such as dicing, stringing, stacking, lamination, edge trimming, and framing. Due to factors such as equipment stability, material flow and extrusion, and environmental conditions, problems like incomplete soldering, open soldering, and over-soldering can easily occur during stringing, stacking, and lamination, significantly impacting production pace and product yield. Even after lamination, incomplete soldering can still occur due to the extrusion of the encapsulant film. Furthermore, during long-term outdoor operation, the alternating hot and cold temperatures can cause alloy aging between the solder strip and the cells, potentially leading to alloy cracking or separation under the combined effects of various factors, thus affecting the power generation capacity of the PV module.
[0003] Currently, when defects are detected in photovoltaic modules through EL (electroluminescence) testing before lamination, the faulty solder joints are either repaired by re-soldering or the properly soldered cell strings are replaced. However, traditional repair processes for faulty solder joints are complex and affect module production efficiency. Furthermore, for outdoor photovoltaic modules, there is a lack of effective repair solutions when defects or even failures occur. Utility Model Content
[0004] Therefore, it is necessary to provide a photovoltaic module welding repair device that is easy to operate and can be applied to the welding repair of defective outdoor components.
[0005] A photovoltaic module welding repair device includes a moving mechanism and a thermal radiation mechanism;
[0006] The moving mechanism includes a first moving bracket, a second moving bracket, and a guide rail. The first moving bracket and the second moving bracket are arranged opposite to each other and can move along a first direction. The guide rail is mounted on the first moving bracket and the second moving bracket along a second direction. The heat radiation mechanism is mounted on the guide rail and can move along the guide rail. The heat radiation mechanism is used to radiate heat the area of the photovoltaic module to be welded and repaired.
[0007] In one embodiment, the first direction is perpendicular to the second direction.
[0008] In one embodiment, the opening of the housing for facing the photovoltaic module is a rectangular opening, the length of which is less than or equal to 210 mm and the width is less than or equal to 105 mm.
[0009] In one embodiment, the heat radiation mechanism includes a housing and a heating element disposed within the housing.
[0010] In one embodiment, the heating element includes at least one of a lamp tube and a thermal resistance wire.
[0011] In one embodiment, there are multiple heating elements.
[0012] In one embodiment, the plurality of heating elements are strip-shaped structures, and the plurality of heating elements are arranged side by side.
[0013] In one embodiment, the inner cavity of the cover includes a plurality of thermal field regions arranged sequentially along the first direction or the second direction, the number of heating elements arranged in the plurality of thermal field regions increases sequentially, and the minimum distance between the heating elements in adjacent thermal field regions is more than twice the distance between adjacent heating elements in the same thermal field region.
[0014] In one embodiment, the number of heating elements in the plurality of thermal field regions increases sequentially by a factor of 1.5 to 2.5.
[0015] In one embodiment, the inner cavity of the cover includes a first thermal field region, a second thermal field region, and a third thermal field region arranged sequentially along the first direction or the second direction, wherein the number of heating elements arranged in the first thermal field region, the second thermal field region, and the third thermal field region increases sequentially.
[0016] In one embodiment, the number of heating elements in the second thermal field region is twice the number of heating elements in the first thermal field region, and the number of heating elements in the third thermal field region is twice the number of heating elements in the second thermal field region.
[0017] Compared with traditional solutions, the above-mentioned photovoltaic module welding repair device has the following advantages:
[0018] In the aforementioned photovoltaic module welding repair device, a first movable support and a second movable support are respectively positioned on both sides (either the long or short side) of the solar cell. A guide rail is mounted on the first and second movable supports, located above the solar cell. A heat radiation mechanism is mounted on the guide rail. The heat radiation mechanism heats the surface and interior of the area to be welded and repaired in the photovoltaic module to the welding temperature through radiation heating. This causes the solder between the solder strip and the solar cell to remelt, thereby performing secondary welding with the grid lines on the surface of the solar cell to form an alloy. This opens the current transmission path from the solar cell to the solder strip, repairing the blackening defect of the solar cells (EL). The movement of the first and second movable supports can adjust the position of the heat radiation mechanism in the first direction, and the movement of the heat radiation mechanism along the guide rail can adjust its position in the second direction, thus enabling repair of any position on the entire surface of the photovoltaic module. The aforementioned photovoltaic module welding repair device is simple to operate, low in cost, and safe and reliable.
[0019] The aforementioned photovoltaic module welding repair device can be used to heat-repair photovoltaic modules with incomplete welds before lamination, as well as finished modules and defective modules for outdoor use. Repairing finished modules helps reduce the series-return and cascading-return ratios during photovoltaic module manufacturing, thereby improving production efficiency. Especially when applied to module coating technology, it can significantly improve module yield. Repairing defective outdoor modules helps increase module power generation and extend their service life. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of a photovoltaic module welding repair device according to an embodiment of the present invention;
[0021] Figure 2 for Figure 1 The diagram shows the distribution of heat-generating components in the photovoltaic module welding repair device.
[0022] Explanation of reference numerals in the attached figures:
[0023] 100. Photovoltaic module welding and repair device; 110. Moving mechanism; 111. First moving support; 112. Second moving support; 113. Guide rail; 120. Heat radiation mechanism; 121. Cover; 122. Heating component; 123. First heat field area; 124. Second heat field area; 125. Third heat field area; 200. Photovoltaic module. Detailed Implementation
[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.
[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0029] like Figure 1and Figure 2 As shown, a photovoltaic module welding repair device 100 according to one embodiment includes a moving mechanism 110 and a thermal radiation mechanism 120.
[0030] The moving mechanism 110 includes a first moving bracket 111, a second moving bracket 112, and a guide rail 113. The first moving bracket 111 and the second moving bracket 112 are arranged opposite to each other and can move along a first direction. The guide rail 113 is mounted on the first moving bracket 111 and the second moving bracket 112 and extends along a second direction. The heat radiation mechanism 120 is mounted on the guide rail 113 and can move along the guide rail 113. The heating element 122 is used to radiate heat the area of the photovoltaic module 200 to be welded and repaired.
[0031] One of the main reasons for the blackening of the EL in photovoltaic modules 200 is the existence of gaps or cracks between the grid lines and solder ribbons on the surface of the solar cells, resulting in poor ohmic contact. In the aforementioned photovoltaic module welding repair device 100, the first movable support 111 and the second movable support 112 are respectively set on both sides (either the long or short side) of the solar cell. The guide rail 113 is mounted on the first movable support 111 and the second movable support 112, located above the solar cell. The heat radiation mechanism 120 is set on the guide rail 113. The heat radiation mechanism 120 heats the surface and interior of the area to be welded and repaired of the photovoltaic module 200 to the welding temperature through radiation heating. This causes the solder between the solder ribbon and the solar cell in this area to remelt, thereby performing secondary welding with the grid lines on the surface of the solar cell to form an alloy, opening up the current transmission path from the solar cell to the solder ribbon, and repairing the blackening defect of the EL. The first movable support 111 and the second movable support 112 can adjust the position of the heat radiation mechanism 120 in the first direction by moving it, and the heat radiation mechanism 120 can adjust its position in the second direction by moving it along the guide rail 113, thereby enabling repair of any position on the entire surface of the photovoltaic module 200. The above-mentioned photovoltaic module welding repair device 100 is simple to operate, low in cost, and safe and reliable.
[0032] The aforementioned photovoltaic module welding repair device 100 can be used to heat-repair photovoltaic modules 200 with incomplete welds before lamination, and can also be used to heat-repair finished modules and defective modules for outdoor use. Repairing finished modules helps reduce the series-return and cascading-return ratios of photovoltaic modules 200 during manufacturing, thereby improving production efficiency. Especially when applied to module coating technology, it can significantly improve module yield. Repairing defective outdoor modules helps increase module power generation and extend their service life.
[0033] In some examples, the first direction is perpendicular to the second direction.
[0034] The opening size of the housing 121 controls the area of heat radiation. The area of heat radiation should not exceed half the area of a solar cell. If the heat radiation area is too large, it can easily cause the solder in well-welded areas to melt, affecting the performance of the alloy material. For example, in some examples, the opening of the housing 121 towards the photovoltaic module 200 is a rectangular opening. Further, in some examples, the length of the rectangular opening is less than or equal to 210 mm, and the width is less than or equal to 105 mm.
[0035] In some examples, the thermal radiation mechanism 120 includes a housing 121 and a heating element 122 disposed within the housing 121. Optionally, the heating element 122 may include, but is not limited to, at least one of a lamp tube and a thermal resistance wire. The lamp tube is preferably a high-power lamp tube to generate a sufficiently high temperature to achieve secondary welding of the grid lines and solder ribbons on the surface of the solar cell and to form an alloy.
[0036] In some examples, the lamp tube includes a housing and a metal wire disposed within the housing. The housing is, for example, but not limited to, a quartz glass housing. The metal wire is, for example, but not limited to, tungsten wire, tungsten alloy wire, nickel wire, nickel alloy wire, chromium wire, chromium alloy wire, copper wire, copper alloy wire, etc.
[0037] Optionally, the number of heating elements 122 is not limited to one; there may be multiple elements.
[0038] In some examples, the housing 121 contains multiple heating elements 122. The multiple heating elements 122 have the same operating power. Further, in some examples, the multiple heating elements 122 in the housing 121 are strip-shaped structures, and the multiple heating elements 122 are arranged side-by-side. Further, in some examples, the multiple heating elements 122 all extend along a first direction or a second direction.
[0039] In some examples, the inner cavity of the housing 121 includes multiple thermal field regions along a first or second direction, and the number of heating elements 122 disposed in the multiple thermal field regions increases progressively.
[0040] During welding repair, rapid temperature rise can adversely affect the encapsulation material inside the photovoltaic module 200. In the example above, multiple thermal zones are set up, each with a different number of heating elements 122, creating multiple thermal zones with different temperatures. As the heat radiation mechanism 120 moves along the first or second direction, the EL blackening area can be heated from a low-temperature thermal zone to a high-temperature thermal zone, causing the EL blackening area to gradually heat up and reducing the adverse effects on the encapsulation material inside the photovoltaic module 200.
[0041] Let W1 be the minimum distance between heating elements 122 in adjacent thermal fields, and W2 be the distance between adjacent heating elements 122 in the same thermal field. To obtain a better temperature gradient and thus better achieve the effect of gradual heating, the relationship between W1 and W2 is preferably W1 ≥ 2W2. For example, W1 = (2~5)W2.
[0042] In some examples, the number of heating elements 122 in multiple thermal zones increases by a factor of 1.5 to 2.5. This arrangement allows the heating temperature to increase gradually at a suitable rate, reducing the adverse effects of instantaneous high temperatures on the encapsulation materials in the photovoltaic module 200.
[0043] In some examples, the inner cavity of the housing 121 sequentially includes a first thermal field region 123, a second thermal field region 124, and a third thermal field region 125 along a first or second direction. The number of heating elements 122 provided in the first thermal field region 123, the second thermal field region 124, and the third thermal field region 125 increases progressively. In the specific example illustrated, the number of heating elements 122 provided in the second thermal field region 124 is twice the number of heating elements 122 provided in the first thermal field region 123. The number of heating elements 122 provided in the third thermal field region 125 is twice the number of heating elements 122 provided in the second thermal field region 124.
[0044] The specific steps for performing welding repair using the photovoltaic module welding repair device 100 described above are as follows:
[0045] Step (1): Adjust the position of the heat radiation mechanism 120 so that the heating component 122 of the first heat field area 123 is directly above the area to be repaired of the photovoltaic module 200. Set the vertical distance from the bottom of the side of the heat radiation mechanism 120 close to the photovoltaic module 200 to the module surface as h. Turn on the power supply of the device to preheat the heat radiation mechanism 120.
[0046] Wherein, h is preferably less than or equal to 10 cm. The preheating rate of the thermal radiation mechanism 120 is preferably less than or equal to 5 °C / s.
[0047] Step (2): After the first thermal field area 123 is preheated to the specified temperature T1, the heat radiation mechanism 120 stays for a time of k1, which does not include the preheating time.
[0048] Let t be the melting point temperature of the solder on the surface of the solder strip used in the photovoltaic module 200. The solder may include, but is not limited to, one or more elements selected from Sn, Pb, Bi, Mn, Ni, Nb, Cu, and Zn. Preferably, the temperature T1 is (t-60℃) to (t-30℃). The time k1 is 10s to 30s.
[0049] Step (3): The device automatically adjusts the horizontal position of the thermal radiation mechanism 120 so that the second thermal field area 124 is directly above the area to be repaired of the photovoltaic module 200. The temperature of the second thermal field area 124 is T2, and the heating time is k2.
[0050] Preferably, the temperature T2 is (t-30℃) ~ t, and the time k2 is 10s~30s.
[0051] Step (4): The device automatically adjusts the horizontal position of the thermal radiation mechanism 120 again so that the third thermal field area 125 is directly above the area to be repaired of the photovoltaic module 200. The temperature of the third thermal field area 125 is T3, and the heating time is k3.
[0052] Preferably, to achieve a good repair effect, the temperature T3 is greater than or equal to t. More preferably, the temperature T3 is (t+10℃) to (t+100℃). The time k3 is 20s to 40s.
[0053] It should be noted that when T3 < t, the solder will not melt, and a good ohmic contact cannot be formed between the solder ribbon and the defective area of the solar cell. When the temperature T3 is between (t+10℃) and (t+100℃), the repair temperature is moderate, allowing for quick and effective repair of poor soldering or failure issues. However, when the temperature exceeds t+100℃, excessively high temperatures can damage the module encapsulation materials, affecting the performance of the photovoltaic module. Furthermore, excessively long repair times can lead to broken grids in the solar cells, causing new defects, while excessively short repair times will fail to achieve satisfactory repair results.
[0054] Step (5): Stop heating, and use the fan to deliver cold air to quickly cool down the localized heating area. Finally, perform EL test and power test to confirm the repair effect.
[0055] The following specific embodiments further illustrate this utility model.
[0056] A photovoltaic module welding repair device 100 according to a specific embodiment includes a moving mechanism 110 and a thermal radiation mechanism 120.
[0057] The moving mechanism 110 includes a first moving bracket 111, a second moving bracket 112, and a guide rail 113. The first moving bracket 111 and the second moving bracket 112 are arranged opposite to each other and are movable along a first direction. The guide rail 113 is mounted on the first moving bracket 111 and the second moving bracket 112 and extends along a second direction. The first direction is perpendicular to the second direction.
[0058] The heat radiation mechanism 120 is mounted on the guide rail 113 and is movable along the guide rail 113. The heat radiation mechanism 120 includes a housing 121 and a heating element 122 disposed within the housing 121. The heating element 122 is a lamp tube extending along a second direction. The inner cavity of the housing 121 sequentially includes a first heat field region 123, a second heat field region 124, and a third heat field region 125 along either the first or second direction. The number of heating elements 122 disposed in the second heat field region 124 is twice the number of heating elements 122 disposed in the first heat field region 123. The number of heating elements 122 disposed in the third heat field region 125 is twice the number of heating elements 122 disposed in the second heat field region 124.
[0059] The photovoltaic module welding repair device 100 of the above specific embodiment is used to repair photovoltaic modules 200 with poor soldering during the production process. The solder on the surface of the solder strip is Sn60Pb40 alloy, which has a specific composition of 60wt% Sn and 40wt% Pb, and the melting point of the solder is about 183°C.
[0060] The repair steps include:
[0061] Step (1): Adjust the position of the heat radiation mechanism 120 so that the heating component 122 of the first heat field area 123 is directly above the area to be repaired of the photovoltaic module 200. Set the vertical distance between the bottom of the side of the heat radiation mechanism 120 close to the photovoltaic module 200 and the surface of the module to 5cm. Turn on the power supply of the device to preheat the heat radiation mechanism 120.
[0062] Step (2): After the first thermal field area 123 is preheated to the specified temperature of 140°C, the heat radiation mechanism 120 stays for 20 seconds.
[0063] Step (3): The device automatically adjusts the horizontal position of the thermal radiation mechanism 120 so that the second thermal field area 124 is directly above the area to be repaired of the photovoltaic module 200. At this time, the temperature of the second thermal field area 124 is 170°C, and the heating time is 20 seconds.
[0064] Step (4): The device automatically adjusts the horizontal position of the thermal radiation mechanism 120 again so that the third thermal field area 125 is directly above the area to be repaired of the photovoltaic module 200. At this time, the temperature of the third thermal field area 125 is 220°C and the heating time continues for 30 seconds.
[0065] After repair, the local EL shadow disappeared, and the poor solder joint defect of photovoltaic module 200 was repaired.
[0066] The photovoltaic module welding repair device 100 of the above specific embodiment is used for photovoltaic modules 200 with poor soldering during the production process. The solder on the surface of the solder strip is Sn43Pb43Bi14 alloy, which has a specific composition of 43wt% Sn, 43wt% Pb and 14wt% Bi. The melting temperature range of the solder is 144℃~163℃.
[0067] The repair steps include:
[0068] Step (1): Adjust the position of the heat radiation mechanism 120 so that the heating component 122 of the first heat field area 123 is directly above the area to be repaired of the photovoltaic module 200. Set the vertical distance between the bottom of the side of the heat radiation mechanism 120 close to the photovoltaic module 200 and the surface of the module to 5cm. Turn on the power supply of the device to preheat the heat radiation mechanism 120.
[0069] Step (2): After the first thermal field area 123 is preheated to the specified temperature of 120°C, the heat radiation mechanism 120 stays for 10 seconds.
[0070] Step (3): The device automatically adjusts the horizontal position of the thermal radiation mechanism 120 so that the second thermal field area 124 is directly above the area to be repaired of the photovoltaic module 200. At this time, the temperature of the second thermal field area 124 is 150°C, and the heating time is 10s.
[0071] Step (4): The device automatically adjusts the horizontal position of the thermal radiation mechanism 120 again so that the third thermal field area 125 is directly above the area to be repaired of the photovoltaic module 200. At this time, the temperature of the third thermal field area 125 is 200℃, and the heating time continues for 40s.
[0072] After repair, the local EL shadow disappeared, and the poor solder joint defect of photovoltaic module 200 was repaired.
[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0074] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A photovoltaic module solder repair apparatus (100), characterized by, Includes a moving mechanism (110) and a thermal radiation mechanism (120); The moving mechanism (110) includes a first moving bracket (111), a second moving bracket (112), and a guide rail (113). The first moving bracket (111) and the second moving bracket (112) are arranged opposite to each other and can move along a first direction. The guide rail (113) is mounted on the first moving bracket (111) and the second moving bracket (112) along a second direction. The heat radiation mechanism (120) is mounted on the guide rail (113) and can move along the guide rail (113). The heat radiation mechanism (120) is used to radiate heat the area of the photovoltaic module (200) to be welded and repaired.
2. Photovoltaic module weld repair apparatus (100) according to claim 1, characterized in that The first direction is perpendicular to the second direction.
3. Photovoltaic module weld repair apparatus (100) according to claim 1, characterized in that The heat radiation mechanism (120) includes a housing (121) and a heating element (122) disposed in the housing (121).
4. Photovoltaic module weld repair apparatus (100) according to claim 3, characterized in that The photovoltaic module welding repair device (100) meets at least one of the following characteristics (1) to (2): (1) The opening of the cover (121) for facing the photovoltaic module (200) is a rectangular opening, the length of which is less than or equal to 210 mm and the width is less than or equal to 105 mm; (2) The heating element (122) includes at least one of a lamp tube and a thermal resistance wire.
5. The photovoltaic module weld repair apparatus (100) of claim 3, wherein, There are multiple heating elements (122).
6. The photovoltaic module welding repair device (100) as described in claim 5, characterized in that, The multiple heating elements (122) are all strip-shaped structures, and the multiple heating elements (122) are arranged side by side.
7. Photovoltaic module solder repair device (100) according to claim 5 or 6, characterized in that The inner cavity of the cover (121) includes a plurality of thermal field regions arranged sequentially along the first direction or the second direction. The number of heating elements (122) arranged in the plurality of thermal field regions increases sequentially. The minimum distance between the heating elements (122) in adjacent thermal field regions is more than twice the distance between adjacent heating elements (122) in the same thermal field region.
8. Photovoltaic module weld repair apparatus (100) according to claim 7, characterized in that The number of heating elements (122) provided in the multiple heat field regions increases by a factor of 1.5 to 2.
5.
9. Photovoltaic module weld repair apparatus (100) according to claim 8, characterized in that The inner cavity of the cover (121) includes a first thermal field region (123), a second thermal field region (124) and a third thermal field region (125) arranged sequentially along the first direction or the second direction, wherein the number of heating components (122) arranged in the first thermal field region (123), the second thermal field region (124) and the third thermal field region (125) increases sequentially.
10. The photovoltaic module weld repair apparatus (100) of claim 9, wherein, The second thermal field region (124) has twice the number of heating elements (122) as the first thermal field region (123), and the third thermal field region (125) has twice the number of heating elements (122) as the second thermal field region (124).