Infrared heating equipment and welding device

Abstract

The utility model relates to the field of welding devices, particularly discloses infrared heating equipment and a welding device, and aims to solve the problems that the temperature of a non-welding area of a battery piece is relatively high and the battery performance is influenced when the conventional infrared heating equipment realizes the serial connection of batteries. In order to achieve the purpose, the infrared heating equipment comprises an equipment body and a plurality of LED lamp sets, a light source area of the equipment body is arranged in the mode that the orthographic projection of the light source area on a battery piece covers the orthographic projection of a welding strip on the battery piece in the battery series connection process, and the light source area is provided with the LED lamp sets comprising a plurality of LED lamp beads. The orthographic projection of the light source area on the battery piece covers the orthographic projection of the welding strip on the battery piece in the battery series connection process, and the LED lamp group is arranged in the light source area, so that the heat generated by the LED lamp group can be concentrated on the welding strip, the absorption of the non-welding area of the battery piece to the heat of the infrared heating equipment is greatly reduced, and the service life of the infrared heating equipment is prolonged. Therefore, the temperature of the battery piece is reduced, and the overall performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding devices, and specifically provides an infrared heating device and a welding device. Background Art

[0002] When producing solar panels, multiple cells need to be connected in series into a cell string, and then the cell string and other components are assembled into one. Taking heterojunction solar cells (HJT) as an example, the temperature requirements during the series connection process are extremely high. When the temperature exceeds 350°C, organic matter will decompose, and when the temperature exceeds 400°C, hydrogen will overflow, causing the amorphous silicon passivation to fail. Therefore, the temperature is crucial during the series connection process. At present, HJT cells are mainly connected in series by welding. During the welding process, it must be ensured that the solder ribbon reaches its melting point to form a stable electrical connection. However, due to the high sensitivity of HJT cells to temperature, temperature control during the welding process has become a major challenge. In order to avoid damage to the battery cells, it is necessary to ensure that the welding temperature is strictly controlled within the tolerance temperature of the battery cells.

[0003] In order to solve the above problems, infrared heating equipment is usually used as the heat source of the welding device. Specifically, multiple independently switchable infrared quartz tubes are arranged vertically with the welding strips on the battery cells to realize the series connection of the battery cells, such as Figure 1-3 However, due to the large difference in the absorption rate of infrared light sources between the battery cell and the solder strip (Sn60Pb40 material), as shown in Figure 4 As shown in the figure, the absorption rate of the solar cell to the infrared light source is high, while the absorption rate of the solder strip to the infrared light source is low, resulting in a large temperature difference between the solar cell and the solder strip when the solder strip reaches the melting temperature. Figure 5 As shown, when the solder strip is at the melting temperature, the non-welding area of ​​the cell (such as Figure 1 The temperature at point B shown is relatively high, and the temperature difference between it and the soldering strip is in the range of 75°C-117°C. The temperature difference between the two is relatively large, which makes the temperature of the non-welding area on the battery cell higher when the battery is connected in series, affecting the performance of the HJT battery. Utility Model Content

[0004] The utility model aims to solve the above technical problem, that is, to solve the problem that the existing infrared heating equipment makes the non-welding area of ​​the battery sheet have a high temperature while realizing the battery series connection, thereby affecting the battery performance. To this end, the utility model provides an infrared heating device, which includes:

[0005] The device body comprises a plurality of light source areas and a plurality of non-light source areas which are arranged alternately with each other, wherein the light source areas are arranged so that their orthographic projections on the battery sheets cover the orthographic projections of the welding strips on the battery sheets during the battery series connection process;

[0006] A plurality of LED light groups are respectively arranged in the corresponding light source areas, and the LED light groups include a plurality of LED lamp beads arranged at intervals.

[0007] In the preferred technical solution of the above infrared heating device, the plurality of LED lamp beads are arranged at non-equidistant intervals; or

[0008] The plurality of LED lamp beads are arranged at equal intervals.

[0009] In the preferred technical solution of the above infrared heating device, the LED light groups are arranged in one-to-one correspondence with the welding strips on the battery cells.

[0010] In the preferred technical solution of the above infrared heating device, the size of the orthographic projection of the LED lamp bead on the battery cell in the first direction is L1, and the size of the orthographic projection of the welding strip on the battery cell in the first direction is L2, wherein L1≥L2.

[0011] In the preferred technical solution of the above infrared heating device, 0mm <L1-L2<10mm。

[0012] In the preferred technical solution of the above infrared heating device, 1mm≤L1≤10mm; and / or

[0013] 0.2mm≤L2≤0.3mm.

[0014] In the preferred technical solution of the above infrared heating device, the infrared heating device further comprises:

[0015] A PCB board is arranged on the device body, and the LED light group is arranged on the PCB board.

[0016] In the preferred technical solution of the above infrared heating device, the plurality of LED lamp groups are connected in series, in parallel or in series and in parallel.

[0017] In the preferred technical solution of the above infrared heating device, the plurality of LED lamp beads are connected in series, in parallel or in series and in parallel.

[0018] The present application also provides a welding device, which includes the infrared heating device described in the above preferred technical solution.

[0019] In the preferred technical solution of the present application, the infrared heating device of the present application arranges the light source area so that its orthographic projection on the battery cell covers the orthographic projection of the solder strip on the battery cell during the battery series connection process, and arranges an LED light group in the light source area, so that the heat generated by the LED light group can be concentrated in the solder strip area, which greatly reduces the absorption of heat from the infrared heating device by the non-welding area of ​​the battery cell, thereby reducing the temperature of the battery cell, which is beneficial to improving the overall performance of the battery.

[0020] Furthermore, by arranging multiple lamp beads at unequal intervals, the infrared heating device can adapt to the welding requirements of cells with and without string spacing, ensuring efficient and accurate welding under various cell layouts. By arranging multiple lamp groups at equal intervals, the infrared heating device can provide a uniform and stable heat source during the welding process.

[0021] Furthermore, by arranging the LED light groups in one-to-one correspondence with the soldering strips on the battery cells, each soldering strip can be heated in a targeted manner, which greatly reduces the absorption of heat from the infrared heating device by the non-soldering areas of the battery cells, thereby reducing the temperature of the battery cells.

[0022] Furthermore, by setting the size of the orthographic projection of the LED lamp bead on the battery cell in the first direction to be greater than or equal to the size of the orthographic projection of the welding strip on the battery cell in the first direction, the absorption of heat from the infrared heating device by the non-welding area of ​​the battery cell is greatly reduced, thereby effectively reducing the temperature of the battery cell during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present application are described below with reference to the accompanying drawings, in which:

[0024] Figure 1 A schematic diagram of a conventional infrared heating device heating a soldering strip on a cell;

[0025] Figure 2 It is a schematic diagram of the arrangement of infrared heating equipment and solar cells when there is no string spacing between solar cells in the prior art;

[0026] Figure 3 It is a schematic diagram of the arrangement of infrared heating equipment and solar cells when there is a string spacing between solar cells in the prior art;

[0027] Figure 4 This is the absorption rate diagram of the battery cell and the solder strip to the infrared light source;

[0028] Figure 5 This is a temperature difference diagram between the soldering ribbon and the battery cell when using existing infrared heating equipment;

[0029] Figure 6 A schematic diagram of the infrared heating device of the present application heating the solder strip on the battery cell;

[0030] Figure 7 This is a schematic diagram of the arrangement of the infrared heating device and the battery when there is no string spacing between the battery cells in this application;

[0031] Figure 8 It is a schematic diagram of the arrangement of the infrared heating device and the battery when there is a string spacing between the battery cells in this application;

[0032] Fig. 9yes Figure 8 Enlarged view of point C;

[0033] Fig.10 This is a temperature difference diagram between the soldering tape and the battery cell when the infrared heating device of the present application is used.

[0034] Description of Reference Numerals

[0035] 1. Infrared heating equipment; 11. Equipment body; 111. Light source area; 112. Non-light source area; 12. LED light group; 121. LED lamp beads; 13. Infrared heating tube; 2. Battery; 21. Battery cell; 211. First side; 212. Second side; 22. Soldering strip; 23. Silver paste printing point; 3. Heating table. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. For example, although the present embodiment is introduced in conjunction with the HJT cell, this is not intended to limit the scope of protection of the present application. Without departing from the principles of the present application, those skilled in the art may apply the present application to other solar cells, such as PERC cells, Topcon cells, etc.

[0037] It should be noted that in the description of this application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting this application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] First, the infrared heating device of the present application is introduced.

[0040] like Figure 1-5As shown, in the prior art, the infrared heating device 1 includes a device body 11 and a plurality of infrared heating tubes 13 arranged on the device body 11. The plurality of infrared heating tubes 13 are arranged parallel to each other, and each infrared heating tube 13 is arranged perpendicular to the soldering strip 22 on the battery cell 21, so that the infrared heating tube 13 can heat the battery cell 21 and the soldering strip 22 thereon. The battery 2 includes a battery cell 21, a silver paste printing point 23 and a soldering strip 22. The battery cell 21 has a first surface 211 and a second surface 212, and the first surface 211 and the second surface 212 are both provided with silver paste printing points 23, and the soldering strip 22 is provided on the side of the two silver paste printing points 23 away from the battery cell 21. The silver paste printing points 23 and the soldering strip 22 on the first surface 211 and the silver paste printing points 23 and the soldering strip 22 on the second surface 212 are symmetrically arranged relative to the battery cell 21. When the batteries 2 are connected in series, the batteries 2 need to be placed between the heating platform 3 and the infrared heating device 1. Specifically, the soldering strip 22 of the second side 212 is placed against the heating platform 3, and the infrared heating device 1 is located above the soldering strip 22 of the first side 211. Under the above-mentioned setting, when the soldering strip 22 of the first side 211 melts, the heat comes from two parts. The first part is the direct radiation of the infrared heating tube 13 to the soldering strip 22, and the second part is that the battery cell 21 receives the heat radiation of the infrared heating tube 13, which is then conducted to the first silver paste printing point 23, and then conducted upward to the soldering strip 22. When the soldering strip 22 of the second side 212 melts, the heat comes from two parts. The first part is the heat conduction of the soldering strip 22 by the heating platform 3, and the second part is that the battery cell 21 receives the heat radiation of the light source, which is then conducted to the silver paste printing point 23 and then conducted downward to the soldering strip 22. The temperatures of the battery cell 21 and the soldering strip 22 of the second side 212 are detected, and the results are as follows: Figure 5 As shown. Figure 5 It can be seen that when the soldering ribbon 22 (made of Sn60Pb40) reaches the melting temperature, the temperature of the non-welding area of ​​the battery cell 21 is relatively high, and the temperature difference between it and the soldering ribbon 22 is in the range of 75-117°C. The temperature difference between the two will have an adverse effect on the HJT battery.

[0041] like Figure 6-9 As shown, in order to solve the problem that when the existing infrared heating device 1 heats the soldering ribbon 22 on the battery cell 21, the temperature of the non-welding area of ​​the battery cell 21 is high, which affects the performance of the battery 2. The infrared heating device 1 of the present application includes a device body 11 and a plurality of LED light groups 12. Among them, the device body 11 includes a plurality of light source areas 111 and a plurality of non-light source areas 112 that are alternately arranged with each other, and the light source area 111 is arranged so that the orthographic projection of the light source area 111 on the battery cell 21 covers the orthographic projection of the soldering ribbon 22 on the battery cell 21 during the series connection of the battery 2. The plurality of LED light groups 12 are respectively arranged in the corresponding light source areas 111, and the LED light group 12 includes a plurality of LED lamp beads 121 arranged at intervals.

[0042] It should be noted that the portion of the battery cell 21 corresponding to the silver paste printing point 23 is the welding area. Figure 6 The area A shown in FIG. 1 is a non-welding area surrounding the silver paste printing point 23 on the battery cell 21. Figure 6 It is also necessary to explain that when the grid-line cells are connected in series, the welding strip 22 refers to the grid line on the grid-line cells, and when the grid-line-free cells are connected in series, the welding strip 22 needs to be installed on the cell sheet 21 .

[0043] The present application arranges the light source area 111 so that its orthographic projection on the battery cell 21 covers the orthographic projection of the welding strip 22 on the battery cell 21 during the series connection process of the battery 2, and arranges an LED light group 12 in the light source area 111, so that the heat generated by the LED light group can be concentrated on the welding strip, which greatly reduces the absorption of heat from the infrared heating device 1 by the non-welding area of ​​the battery cell 21, thereby reducing the temperature of the battery cell 21, which is beneficial to improving the overall performance of the battery 2.

[0044] Refer to the following Figure 6-9 , a preferred embodiment of the infrared heating device 1 of the present application is introduced. Those skilled in the art will understand that the embodiments described below are only used to illustrate the principles of the present application and are not intended to limit the scope of protection of the present application. On the premise that the infrared heating device 1 at least includes a device body 11 and an LED light group 12, those skilled in the art can adjust the following settings so that the present application can be applied to more specific application scenarios.

[0045] See also Figure 6-8 As shown, the infrared heating device 1 includes a device body 11 and a plurality of LED light groups 12. The device body 11 includes a plurality of light source areas 111 and a plurality of non-light source areas 112 that are alternately arranged. The light source area 111 is arranged so that its orthographic projection on the battery cell 21 covers the orthographic projection of the welding strip 22 on the battery cell 21 during the series connection of the battery 2, so that each welding strip 22 on the battery cell 21 can be covered by the light source area 111 of the infrared heating device 1. Each light source area 111 is provided with an LED light group 12, and each LED light group 12 is arranged in a one-to-one correspondence with the welding strip 22 on the battery cell 21, so that each LED light group 12 can heat its corresponding welding strip 22, thereby greatly reducing the absorption of heat of the infrared heating device 1 by the non-welding area of ​​the battery cell 21, reducing the temperature of the battery cell 21, and thus facilitating the improvement of the overall performance of the battery 2.

[0046] It should be noted that the present application has no restrictions on the manner in which the LED light group 12 is arranged on the device body 11, as long as the LED light group 12 can be installed on the device body 11 and can heat the soldering strip 22. For example, the infrared heating device 1 further includes a plurality of PCB boards, and the plurality of PCB boards correspond one-to-one with the LED light groups 12, so that each LED light group 12 can be arranged on the device body 11 through the PCB board. Alternatively, the infrared heating device 1 further includes a PCB board, and the plurality of LED light groups 12 are arranged on the same PCB board, so that the plurality of LED light groups 12 can be arranged on the device body 11 through the PCB board.

[0047] It should also be noted that the present application has no restrictions on the arrangement of the LED light groups 12, as long as the LED light groups 12 can heat the soldering strips 22. For example, multiple LED light groups 12 can be arranged in parallel with each other, so that the LED light groups 12 can be independently controlled, and the power and irradiation time of each LED light group 12 can be flexibly adjusted according to actual needs, thereby adjusting the heating temperature and time of each soldering strip 22. Alternatively, multiple LED light groups 12 can be arranged in series, which can simplify the circuit and save costs. Alternatively, the LED light groups 12 can be arranged in series and in parallel.

[0048] See next Figure 6-9 , the device body 11 is parallel to the welding strip 22 so that each LED light group 12 and the corresponding welding strip 22 are parallel to each other, and the LED light group 12 is arranged directly above the welding strip 22. Among them, each LED light group 12 includes a plurality of LED lamp beads 121, and the plurality of LED lamp beads 121 in each LED light group 12 are arranged at non-equal intervals, so that the infrared heating device 1 can adapt to the welding requirements of battery cells 21 with and without string spacing, ensuring efficient and accurate welding under various battery cell 21 layouts. In addition, the light source area 111 of the device body 11 is divided into an effective area and an invalid area by the LED lamp beads 121, wherein the part of the light source area 111 where the LED lamp beads 121 are arranged is the effective area, and the part without the LED lamp beads 121 is the invalid area. The welding strip 22 on the battery cell 21 is heated by the effective area, which greatly reduces the energy consumption of the infrared heating device 1.

[0049] It should be noted that the present application has no restrictions on the connection method between the LED lamp beads 121, as long as the LED lamp beads 121 can heat the soldering strip 22. For example, multiple LED lamp beads 121 can be arranged in parallel with each other. Alternatively, multiple LED lamp beads 121 can be arranged in series. Alternatively, the LED lamp beads 121 can be arranged in series and in parallel.

[0050] Of course, the setting relationship between the device body 11 and the solder tape 22 in this application is not fixed, and those skilled in the art can adjust it according to the setting requirements. For example, the device body 11 and the solder tape 22 may not be parallel to each other, as long as the orthographic projection of the light source area 111 on the device body 11 on the battery cell 21 can cover the upper projection of the solder tape 22 on the battery cell 21.

[0051] Next, refer to Figure 6-9 , the size of each lamp bead in the first direction (such as Figure 7 the Y direction shown) is larger than the size of the solder tape 22 in the first direction. Since the LED lamp group 12 and the corresponding solder tape 22 are parallel to each other, the size of the LED lamp bead 121 in the first direction is equal to the size of the orthographic projection of the LED lamp bead 121 on the battery cell 21 in the first direction, and the size of the solder tape 22 in the first direction is equal to the size of the orthographic projection of the solder tape 22 on the battery cell 21 in the first direction. Also, since the LED lamp group 12 is arranged in the light source area 111, the size of the orthographic projection of the light source area 111 on the battery cell 21 in the first direction is larger than the size of the orthographic projection of the solder tape on the battery cell 21 in the first direction. Among them, the size of the orthographic projection of the LED lamp bead 121 on the battery cell 21 in the first direction is L1, and the size of the orthographic projection of the solder tape 22 on the battery cell 21 in the first direction is L2, where L1≥L2.

[0052] Specifically, 1mm≤L1≤10mm, where the size of the orthographic projection of the LED lamp bead 121 on the battery cell 21 in the first direction can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm. 0.2mm≤L2≤0.3mm, where the size of the orthographic projection of the solder tape 22 on the battery cell 21 in the first direction can be 0.2mm, 0.25mm or 0.3mm. 0mm<L1-L2<10mm, where the difference between the size of the orthographic projection of the LED lamp bead 121 on the battery cell 21 in the first direction and the size of the orthographic projection of the solder tape 22 on the battery cell 21 in the first direction can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm or 9mm.

[0053] Of course, the relationship between the size of the lamp bead in the width direction and the size of the solder tape 22 in the width direction in this application is not fixed, and those skilled in the art can adjust it according to the specific application scenario. For example, the size L1 of the orthographic projection of the LED lamp group 12 on the battery cell 21 in the first direction is the same as the size L2 of the orthographic projection of the solder tape 22 on the battery cell 21 in the first direction, that is, L1-L2 = 0mm.

[0054] Combined with Fig.10 to illustrate the influence of the infrared heating device of this application on the temperature of the battery cell 21.

[0055] The infrared heating device 1 includes a device body 11 and a plurality of LED light groups 12. The device body 11 includes a plurality of light source areas 111 and a plurality of non-light source areas 112 arranged alternately with each other. The number of light source areas 111 is the same as the number of solder strips 22 on the battery cell 21, and they correspond one to one, and the light source areas 111 are arranged so that their orthographic projections on the battery cell 21 cover the orthographic projections of the solder strips 22 on the battery cell 21 during the series connection of the battery 2. Each light source area 111 is provided with an LED light group 12. Each LED light group 12 includes a plurality of LED lamp beads 121, and the plurality of LED lamp beads 121 in each LED light group 12 are arranged at non-equidistant intervals. The size of the orthographic projection of the LED lamp bead 121 on the battery cell 21 in the first direction is 3.5 mm. The size of the orthographic projection of the solder strip 22 on the battery cell 21 in the first direction is 0.25 mm. The difference between the size of the orthographic projection of the LED lamp bead 121 on the battery cell 21 in the first direction and the size of the orthographic projection of the solder strip 22 on the battery cell 21 in the first direction is 3.25 mm. The battery 2 is arranged between the heating platform 3 and the infrared heating device 1. Specifically, the soldering strip 22 of the second surface 212 is arranged close to the heating platform 3, and the infrared heating device 1 is located above the soldering strip 22 of the first surface 211. The temperature of the battery cell 21 and the soldering strip 22 of the second surface 212 is detected. The result is as follows: Fig.10 As shown. Fig.10 It can be seen that when the soldering strip 22 (made of Sn60Pb40) reaches the melting temperature, the temperature difference between the non-welding area of ​​the battery cell 21 and the soldering strip 22 is in the range of 37-85°C. Compared with the infrared heating device 1 in the prior art, the infrared heating device 1 of the present application can reduce the temperature of the battery cell 2, thereby reducing the temperature difference between the battery cell 21 and the soldering strip 22.

[0056] In addition, the present application also provides a welding device, which includes the infrared heating device described in any of the above embodiments.

[0057] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0058] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An infrared heating device, characterized in that: include: The device body comprises a plurality of light source areas and a plurality of non-light source areas which are arranged alternately with each other, wherein the light source areas are arranged so that their orthographic projections on the battery sheets cover the orthographic projections of the welding strips on the battery sheets during the battery series connection process; A plurality of LED light groups are respectively arranged in the corresponding light source areas, and the LED light groups include a plurality of LED lamp beads arranged at intervals.

2. The infrared heating device according to claim 1, characterized in that: The plurality of LED lamp beads are arranged at unequal intervals; or The plurality of LED lamp beads are arranged at equal intervals.

3. The infrared heating device according to claim 1, characterized in that: The LED light groups are arranged in one-to-one correspondence with the welding strips on the battery sheets.

4. The infrared heating device according to claim 1, characterized in that: The size of the orthographic projection of the LED lamp bead on the battery cell in the first direction is L1, and the size of the orthographic projection of the welding strip on the battery cell in the first direction is L2, wherein L1≥L2.

5. The infrared heating device according to claim 4, characterized in that: 0mm <L1-L2<10mm。 6. The infrared heating device according to claim 4, characterized in that: 1mm≤L1≤10mm; and / or 0.2mm≤L2≤0.3mm.

7. The infrared heating device according to claim 1, characterized in that: The infrared heating device also includes: A PCB board is arranged on the device body, and the LED light group is arranged on the PCB board.

8. The infrared heating device according to claim 1, characterized in that: The plurality of LED light groups are connected in series, in parallel or in series and in parallel.

9. The infrared heating device according to claim 1, characterized in that: The plurality of LED lamp beads are connected in series, in parallel or in series and in parallel.

10. A welding device, characterized in that: The welding device comprises the infrared heating device according to any one of claims 1-9.

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