Photovoltaic cell heating device and welding equipment

Abstract

The utility model provides a photovoltaic cell heating device and welding equipment, and the heating device is used for heating a welding strip to enable the welding strip to be welded with a main grid on a cell piece, and comprises a plurality of groups of first heating sources which extend in the direction of the main grid on the cell piece and are arranged in the direction perpendicular to the main grid; the two groups of second heating sources extend along the main grid direction on the battery piece, and the two groups of second heating sources are positioned on two sides in the arrangement direction of the plurality of groups of first heating sources; each of the first heating source and the second heating source comprises a plurality of heating bodies, the number of the heating bodies of the first heating source is m, and the number of the heating bodies of the second heating source is m + n; wherein m and n are positive integers. According to the technical scheme, the heating efficiency of the first heating source and the heating efficiency of the second heating source on the battery piece are kept synchronous, the temperature uniformity after all the parts are heated is improved, the temperature uniformity of all the welding positions is guaranteed, and the welding quality of the welding strip and the battery piece is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic cells, and in particular to a photovoltaic cell heating device and welding equipment. Background Art

[0002] The preparation process of photovoltaic modules requires welding, which is to heat the soldering ribbon to melt its surface coating and weld it to the grid electrode of the battery cell. The welding quality directly affects the current collection and conduction efficiency of the photovoltaic module.

[0003] At present, infrared lamps are used for irradiation heating in welding. Multiple infrared lamps are set in the light box to heat the battery cells. The infrared lamps are set at positions corresponding to the main grids (i.e. the welding strips) on the battery cells. However, the heat generated by the infrared lamps corresponding to the main grids at the farthest sides diffuses partly to the outside. The heat received by the main grids at the farthest sides is less than that received by the main grids at the inner sides. Therefore, the heat received by each welding position on the battery cell is different, resulting in uneven temperature.

[0004] Due to the problem of uneven temperature, it is difficult to avoid that the temperature at some welding positions is too high or too low during the welding process, resulting in over-welding or cold welding between the welding ribbon and the main grid of the battery cell, which reduces the overall quality of the photovoltaic module. Utility Model Content

[0005] The present application provides a photovoltaic cell heating device and welding equipment, which improves the uniformity of temperature at each welding position on the cell, reduces the risk of over-welding or cold welding, improves welding quality, and improves the overall quality of the cell assembly.

[0006] In a first aspect, the present application provides a photovoltaic cell heating device for heating a welding strip to weld it to a main grid on a cell sheet, comprising:

[0007] A plurality of groups of first heating sources are all extended along the main grid direction on the battery sheet and arranged in a direction perpendicular to the main grid;

[0008] Two groups of second heating sources extend along the main grid direction on the battery sheet, and the two groups of second heating sources are located on both sides of the arrangement direction of the plurality of groups of the first heating sources;

[0009] The first heating source and the second heating source both include a plurality of heating bodies, the number of the heating bodies of the first heating source is m, and the number of the heating bodies of the second heating source is m+n;

[0010] Wherein, m and n are both positive integers.

[0011] In the above technical solution, the number of heating bodies of the second heating source is set to be greater than the number of heating bodies of the first heating source, so as to compensate for the lack of heating efficiency compared with the first heating source due to the fact that the second heating source is located at the edge and radiates heat to the outside, so that the efficiency of heating the battery cell by the first heating source and the second heating source is kept synchronized, thereby improving the uniformity of temperature after heating various parts; when heating the battery cell and the welding strip for welding, the uniformity of temperature at each welding position is ensured, thereby reducing the problem of over-welding or cold welding at some welding positions due to uneven temperature, thereby improving the welding quality of the welding strip and the battery cell.

[0012] In a specific embodiment, the m heating bodies of each group of the first heating source are arranged in two rows;

[0013] The m+n heating bodies of each group of the second heating source are arranged in three rows,

[0014] The multiple rows of heating bodies in the same group are arranged in a direction perpendicular to the main grid of the battery cell.

[0015] In the above technical scheme, the heating body can be set as a lamp bead structure, in which case there are multiple heating bodies in each row, and the multiple heating bodies are arranged in rows; the heating body can also be set as a long strip of lamp tubes, in which case each row of heating bodies can include one, two, three or other numbers; in actual design, the specific layout method can be determined according to actual needs, which can achieve the purpose of improving heating uniformity, so that the overall applicability of the heating device is better.

[0016] In a specific possible implementation scheme, the multiple groups of first heating sources and the two groups of second heating sources correspond one-to-one to the multiple main grids on the battery cell, and are arranged directly opposite to the corresponding main grids.

[0017] In the above technical solution, the first heating source and the second heating source are arranged opposite to the multiple main grids, so that the heat generated by each group of heating sources is mainly conducted to the corresponding main grid, which is used to heat the welding strip located at the main grid, thereby improving the utilization rate of heat and reducing waste.

[0018] In a specific embodiment, it also includes a heating lamp group.

[0019] The supplementary heating lamp group is arranged at two ends of the first heating source and the second heating source in the extension direction of the main grid.

[0020] In the above technical solution, supplementary heat is applied to both ends of the first heating source and the second heating source in their extension direction to make up for the gap caused by the heat dissipation to the outside and the absence of other heating bodies on the outside to conduct heat to this place, thereby further improving the uniformity of heating of various positions in the area by the heating device and improving the quality of heating and welding of the welding strip and the battery cell.

[0021] In a specific implementation scheme, there are multiple supplementary heating lamp groups, and the multiple supplementary heating lamp groups are respectively arranged at both ends of each of the first heating source and the second heating source;

[0022] The extension direction of the supplementary heat lamp group is the same as the main grid direction.

[0023] In the above technical scheme, the uniformity of heating at various positions of the heating device is improved by "extending" the first heating source and the second heating source; in actual design, the supplementary heating lamp group can be integrated with the original first heating source and the second heating source, that is, the length of the original first heating source and the second heating source can be increased, and the increased part can play the role of the supplementary heating lamp group, which is convenient for design and actual production.

[0024] In a specific possible implementation mode, the extension direction of the supplementary heat lamp group is perpendicular to the main grid direction.

[0025] In the above technical solution, vertical supplementary heating lamp groups are arranged at the ends of the original first heating source and the second heating source, so as to achieve the purpose of improving the uniformity of the heating effect of the heating device while minimizing the change in the size of the original heating device.

[0026] On the other hand, the present application also provides a photovoltaic cell welding device, comprising a conveying device and a heating device as described in any one of the above items;

[0027] The heating device is used to heat the welding area, and the conveying device is used to convey the battery cell and the welding strip through the welding area.

[0028] In the above technical solution, a corresponding heating device is used to heat the welding ribbon to achieve welding between the welding ribbon and the battery cell. The heating device has a more uniform heating effect, so that the temperature of each welding position is kept consistent under the action of the heating device, reducing the problem of over-welding or cold welding at some welding positions, improving the welding quality, and the quality of the produced photovoltaic modules is also better.

[0029] In a specific possible implementation manner, the extension direction of the first heating source and the second heating source is the same as the direction in which the conveying device drives the battery cell to move.

[0030] In the above technical scheme, the situation that the first heating source and the second heating source cannot be aligned with the corresponding main grid during heating due to the deviation in the stopping position of the conveying device carrying the battery cell, or the displacement of the battery cell relative to the conveying device when the conveying device is started or stopped, can be reduced. It is ensured that the first heating source and the second heating source are aligned with the corresponding main grid during heating, thereby improving the utilization rate of heat and reducing waste.

[0031] In a specific embodiment, it further comprises a preheating device, wherein the preheating device is used to preheat the preheating zone;

[0032] The conveying device drives the battery cells to pass through the preheating zone and the welding zone in sequence;

[0033] The width of the preheating device is greater than the width of the battery cell.

[0034] In the above technical solution, the welding strip is first preheated before being heated and welded, so that the battery cell is heated to a certain extent. When the strip is subsequently heated by a heating device, the heat transferred to the battery cell can be transferred to the welding strip more quickly, so that the welding strip rises to the required temperature in a shorter time, melts and is welded and fixed to the battery cell, thereby improving efficiency.

[0035] In a specific possible implementation scheme, the conveying device is provided with a carrying surface for placing the battery sheet;

[0036] The preheating device is located on a side of the carrying surface away from the battery sheet.

[0037] In the above technical solution, when preheating the battery cell, heat is conducted to the battery cell through the conveying device, which helps to improve the uniformity of heating the battery cell; and when preheating the battery cell, it also avoids problems such as damage and quality degradation caused by excessive battery cell temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 An overall schematic diagram of a welding device provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of the corresponding relationship between the heating device and the battery cell provided in an embodiment of the present application.

[0040] Explanation of the reference numerals: 1. conveying device; 11. mounting frame; 12. conveyor belt; 2. heating device; 21. mounting base; 22. first heating source; 23. second heating source; 24. supplementary heating lamp group; 3. battery cell; 31. main grid; 4. preheating device; a. welding area; b. preheating area. DETAILED DESCRIPTION

[0041] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.

[0042] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0043] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0044] To facilitate understanding of the photovoltaic cell heating device and welding equipment provided in the embodiments of the present application, the overall structure of the photovoltaic cell welding equipment is first briefly described. The photovoltaic cell welding equipment and the string welding machine commonly known in the art are used for welding and connecting the welding strip and the battery cell, wherein the welding process is achieved by heating with a heating lamp, that is, a heating device, which melts the coating on the surface of the welding strip by heating and welds it to the grid line on the battery cell.

[0045] The heating device includes multiple groups of infrared lamps, which are arranged corresponding to the main grids on the battery cells. The temperature of the main grid at the outermost side is lower than that of the inner main grid. This is because part of the heat of the infrared lamp at the outermost side diffuses to the outside, while the inner main grid not only receives the heat of the corresponding infrared lamp, but also receives part of the heat of the infrared lamp at the side. In the actual welding process, due to the problem of uneven temperature at each welding position, some welding strips and the main grid of the battery cell may be over-welded or cold-welded, resulting in poor welding quality.

[0046] The embodiments of the present application provide a photovoltaic cell heating device and welding equipment, which improve the uniformity of the temperature of each welding position, reduce the risk of over-welding or cold welding of some welding strips during welding, improve welding quality, and produce photovoltaic modules with better quality. The following is a detailed description of the device in conjunction with specific drawings and embodiments.

[0047] For the sake of convenience, the “photovoltaic cell heating device” will be referred to as the “heating device” and the “photovoltaic cell welding equipment” will be referred to as the “welding equipment” below.

[0048] Figure 1 The structure diagram of the welding equipment provided in the embodiment of the present application is shown. Figure 2 The structure of the heating device and the relative position diagram of the heating device and the battery cell are shown, wherein: Figure 2 In order to clearly illustrate the specific structure of the heating device, the mounting base is only illustrated as a rectangular frame structure.

[0049] refer to Figure 1The welding equipment provided in the embodiment of the present application includes a conveying device 1 and a heating device 2. The heating device 2 is used to heat the welding area a. When the battery cell 3 is located in the welding area a, the heating device 2 heats the battery cell 3 and the welding strip to achieve welding between the welding strip and the main grid 31 on the battery cell 3; the conveying device 1 is used to transport the battery cell 3 through the welding area a. The conveying device 1 is provided with a carrying surface for placing the battery cell 3. The welding strip is placed at the position of the main grid 31 on the battery cell 3. The battery cell 3 is moved to the welding area a under the drive of the conveying device 1, and the heating device 2 is heated to achieve welding connection between the welding strip and the main grid 31 on the battery cell 3.

[0050] Exemplarily, the conveying device 1 includes a mounting frame 11 and a conveyor belt 12 disposed on the mounting frame 11. In addition, a motor and other related components for driving the conveyor belt 12 are also provided. The conveyor belt 12 is a conventional choice as a conveying device in the relevant field, and its specific structure is not described in detail. Of course, in other embodiments, other conventional conveying equipment in the field can also be selected. The embodiment of the present application only takes the conveying of the battery cell 3 by the conveyor belt 12 as an example for explanation.

[0051] refer to Figure 2 The heating device 2 includes a mounting base 21, multiple groups of first heating sources 22 and two groups of second heating sources 23. The mounting base 21 is relatively fixed to the mounting frame 11, and the multiple groups of first heating sources 22 and the two groups of second heating sources 23 are fixedly connected to the mounting base 21. Among them, the multiple groups of first heating sources 22 extend along the main grid 31 on the battery cell 3, and the multiple groups of first heating sources 22 are arranged at intervals in the direction perpendicular to the main grid 31; the two groups of second heating sources 23 also extend along the main grid 31, and the two groups of second heating sources 23 are located on both sides of the multiple groups of first heating sources 22 in the arrangement direction. That is, the multiple first heating sources 22 and the two groups of second heating sources 23 are arranged at intervals in the direction perpendicular to the main grid 31, the two groups of second heating sources 23 are located at the outermost side, and the other multiple groups of first heating sources 22 are located between the two groups of second heating sources 23.

[0052] The first heating source 22 and the second heating source 23 both include a plurality of heating bodies, wherein the number of heating bodies included in the first heating source 22 is m, and the number of heating bodies included in the second heating source 23 is m+n, and both m and n are positive integers.

[0053] According to the different locations of the first heating source 22 and the second heating source 23, the number of heating bodies of the first heating source 22 and the second heating source 23 are designed differently, and the second heating source 23 located at the outermost side includes more heating bodies in each group. The increased number of heating bodies of the second heating source 23 compared to the first heating source 22 can make up for the lack of heat due to the second heating source 23 being located at the outermost side and radiating outwards, but no other heating structure on the outer side conducts heat to this place, so that the temperature of the main grid 31 at the outermost side of the battery cell 3 is kept the same as the temperature of the main grid 31 located at the inner side.

[0054] In this way, the uniformity of the temperature at each main grid 31 on the battery cell 3 can be improved during the heating process, so that during the welding process, the progress of welding multiple welding strips and the main grid 31 on the battery cell 3 is consistent, reducing the risk of over-welding or cold welding at some welding positions, ensuring stable welding of the welding strips and the battery cell 3, avoiding the problem of reduced current collection and transmission efficiency of the photovoltaic module due to over-welding and cold welding, and improving the quality of the produced photovoltaic modules.

[0055] Exemplarily, the m heating bodies of each group of the first heating source 22 are arranged in two rows, and the m+n heating bodies of each group of the second heating source 23 are arranged in three rows. It should be noted that in actual use, the heating body can be set as a long strip of lamp tubes, the first heating source 22 includes two lamp tubes, and the second heating source 23 includes three lamp tubes, that is, the value of m is 2, and the value of n is 1; it can also be set that the heating body is a lamp bead, and a plurality of lamp beads are arranged in a row along the extension direction of the main grid 31, the first heating source 22 includes two rows of lamp beads, and the second heating source 23 includes three rows of lamp beads. At this time, the values ​​of m and n are not limited to 2 and 3 respectively, which only means that the plurality of lamp beads can be arranged in two rows and three rows respectively. Of course, in the case where the heating body is a lamp tube, each row can also be set to include multiple lamp tubes.

[0056] In other embodiments, the heating bodies of the first heating source 22 may be arranged in two rows and the heating bodies of the second heating source 23 may be arranged in four rows, or the heating bodies of the first heating source 22 may be arranged in three rows and the heating bodies of the second heating source 23 may be arranged in four rows, etc. The specific number may be adaptively adjusted according to actual needs during actual design.

[0057] refer to Figure 2 , multiple groups of first heating sources 22 and two groups of second heating sources 23 correspond to multiple main grids 31 on the battery cell 3, and are arranged opposite to the corresponding main grids 31. In this way, the heat generated by the heating source can be mainly concentrated at the position of the main grid 31, that is, the position where the welding strip is located, which can improve the utilization rate of the heat generated by the heating source and reduce energy waste.

[0058] If the heating source is set to the position between two adjacent main grids 31, most of the heat generated by the heating source will be transferred to the gap between the main grids 31 on the battery cell 3, but this part is not the target to be heated. However, by setting the heating source to correspond to the main grid 31 one by one and setting it to the main grid 31, the heat generated by the heating source is mainly used to melt the surface coating of the welding strip, thereby improving energy utilization.

[0059] refer to Figure 1 and Figure 2 The extension direction of the first heating source 22 and the second heating source 23 is the same as the direction in which the conveying device 1 drives the battery cell 3 to move; compared with the setting method in which the extension direction of the heating source is perpendicular to the moving direction of the battery cell 3, the probability of inaccurate corresponding position of the heating source and the main grid 31 due to the stop position deviation of the conveying device 1 can be reduced, the accuracy of the correspondence between the heating source and the main grid 31 on the battery cell 3 is improved, and the overall welding quality is improved.

[0060] In addition, reference Figure 2 The heating device 2 also includes a supplementary heating lamp group 24, which is fixedly connected to the mounting base 21 and is located at both ends of the first heating source 22 and the second heating source 23 in the extension direction of the main grid 31.

[0061] When the first heating source 22 and the second heating source 23 are arranged in parallel, the heat generated by the heating body at the ends in their extension direction is also dissipated externally. This situation will also cause differences in the degree of heating of various parts by the heating device 2, resulting in poor heating uniformity of the heating device 2.

[0062] The supplementary heating lamp group 24 provided in the embodiment of the present application can compensate for the heat wasted at the end of the heating device 2, avoid the problem that the heating efficiency at the end of the heating device 2 is lower than that in the middle area, and improve the uniformity of each welding position between the welding strip and the main grid 31.

[0063] Exemplarily, there are multiple supplementary heat lamp groups 24, and the multiple supplementary heat lamp groups 24 are respectively arranged at both ends of each first heating source 22 and each second heating source 23, and the extension direction of the supplementary heat lamp group 24 is the same as the direction of the main grid 31, that is, the same as the extension direction of the corresponding first heating source 22 and second heating source 23. At this time, the set supplementary heat lamp group 24 is equivalent to the extension of the first heating source 22 and the second heating source 23 in the extension direction of the main grid 31. By "extending" the first heating source 22 and the second heating source 23, the problem that the heating effect at the end of the heating source is poorer than that in the middle area can be alleviated, the uniformity of the heating temperature at each welding position can be improved, and the welding quality can be improved.

[0064] In another embodiment, the extension direction of the supplementary heat lamp group 24 is set to be perpendicular to the extension direction of the main grid 31; in this embodiment, there can be multiple supplementary heat lamp groups 24, which are correspondingly arranged at the end of each heating source; or there can be two supplementary heat lamp groups 24, that is, a row of supplementary heat lamp groups 24 are respectively arranged at both ends of the heating source.

[0065] In addition, reference Figure 1 and Figure 2 The welding equipment also includes a preheating device 4, which is used to preheat the preheating zone b, wherein the preheating zone b is located in front of the welding zone a, and the conveying device 1 drives the battery cell 3 to pass through the preheating zone b and the welding zone a in sequence; the width of the preheating device 4 is greater than the width of the battery cell 3.

[0066] The width of the cell 3 is the size of the cell 3 in the direction of arrangement of the multiple main grids 31, and correspondingly, the width of the preheating device 4 is the size of the preheating device 4 in the direction of arrangement of the multiple main grids 31. Setting the width of the preheating device 4 to be greater than the width of the cell 3 can ensure uniformity in preheating various parts of the cell 3, keep the temperature of different positions consistent, and subsequently transport the cell 3 to the welding area a for heating, which is conducive to ensuring consistency of heating progress and better welding effect.

[0067] The preheating device 4 can be made of different types of heating elements commonly used in the art, such as infrared heating, resistance wire heating, etc.

[0068] Of course, in actual setting, the length of the preheating device 4 can also be set to be greater than the length of the battery cell 3, where the “length” refers to the size of the preheating device 4 and the battery cell 3 in the direction parallel to the extension of the main grid 31.

[0069] The preheating device 4 is located on the side of the carrying surface facing away from the battery cell 3; illustratively, when the battery cell 3 is transported by the conveyor belt 12, the carrying surface is the outer ring surface of the conveyor belt 12, and the battery cell 3 is carried when the outer ring surface is facing upward; the preheating device 4 is arranged on the inner side of the annular structure formed by the conveyor belt 12, and the battery cell 3 is preheated by transferring heat from the conveyor belt 12 to the battery cell 3, which is beneficial to improving the uniformity of the temperature of different parts of the battery cell 3 after the battery cell 3 is preheated.

[0070] It should be noted that in the embodiment of the present application, the different settings of the first heating source 22 and the second heating source 23 do not involve different designs of their heating body models, powers, etc.; the "first heating source 22" and "second heating source 23" expressed in the text are separate limitations of the two, and the part expressed as "heating source" represents the common limitation of the first heating source 22 and the second heating source 23.

[0071] In the description of the present application, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present application. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense; in addition, the term "a plurality" in this application refers to two or more. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.

Claims

1. A photovoltaic cell heating device, used for heating a welding strip to weld it to a main grid on a cell, characterized in that: include, A plurality of groups of first heating sources are all extended along the main grid direction on the battery sheet and arranged in a direction perpendicular to the main grid; Two groups of second heating sources extend along the main grid direction on the battery sheet, and the two groups of second heating sources are located on both sides of the arrangement direction of the plurality of groups of the first heating sources; The first heating source and the second heating source both include a plurality of heating bodies, the number of the heating bodies of the first heating source is m, and the number of the heating bodies of the second heating source is m+n; Wherein, m and n are both positive integers.

2. The photovoltaic cell heating device according to claim 1, characterized in that: The m heating bodies of each group of the first heating source are arranged in two rows; The m+n heating bodies of each group of the second heating source are arranged in three rows, The multiple rows of heating bodies in the same group are arranged in a direction perpendicular to the main grid of the battery cell.

3. The photovoltaic cell heating device according to claim 1 or 2, characterized in that: The multiple groups of first heating sources and the two groups of second heating sources correspond one-to-one to the multiple main grids on the battery sheet, and are arranged directly opposite to the corresponding main grids.

4. The photovoltaic cell heating device according to claim 1, characterized in that: Also includes a heat lamp set, The supplementary heating lamp group is arranged at two ends of the first heating source and the second heating source in the extension direction of the main grid.

5. The photovoltaic cell heating device according to claim 4, characterized in that: There are multiple supplementary heating lamp groups, and the multiple supplementary heating lamp groups are respectively arranged at both ends of each of the first heating source and the second heating source; The extension direction of the supplementary heat lamp group is the same as the main grid direction.

6. The photovoltaic cell heating device according to claim 4, characterized in that: The extension direction of the supplementary heat lamp group is perpendicular to the main grid direction.

7. A photovoltaic cell welding device, characterized in that: comprising a conveying device and a heating device as claimed in any one of claims 1 to 6; The heating device is used to heat the welding area, and the conveying device is used to convey the battery cell and the welding strip through the welding area.

8. The photovoltaic cell welding equipment according to claim 7, characterized in that: The extending direction of the first heating source and the second heating source is the same as the direction in which the conveying device drives the battery cell to move.

9. The photovoltaic cell welding equipment according to claim 7, characterized in that: Also included is a preheating device, the preheating device is used to preheat the preheating zone; The conveying device drives the battery cells to pass through the preheating zone and the welding zone in sequence; The width of the preheating device is greater than the width of the battery cell.

10. The photovoltaic cell welding equipment according to claim 9, characterized in that: The conveying device is provided with a carrying surface for placing the battery sheets; The preheating device is located on a side of the carrying surface away from the battery sheet.

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