Solar cell, cell string and photovoltaic module
By using positioning glue to pre-position welding tape and performing low-temperature welding during the welding process of solar cell cells, the problem of welding tape shift is solved, the welding accuracy and product quality are improved, and good conduction between the cells and photovoltaics are ensured. Efficient conversion efficiency of components.
Patent Information
- Application Number
- CN202323329619.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-06
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2033-12-06
AI Technical Summary
During the welding process of solar cell cells, the welding tape is prone to shift, resulting in poor welding accuracy and affecting the conduction effect between the cells and product quality.
Positioning glue is used to bond with welding tape, pre-position the welding tape, and welding the welding tape to the electrode under low temperature conditions to ensure welding accuracy.
Effectively prevent welding tape from shifting, improve welding accuracy, ensure the conduction effect between the cells, and improve product quality and the performance stability of photovoltaic modules.
Smart Images
Figure CN222282036U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solar cells, and in particular to a solar cell sheet, a battery string and a photovoltaic component. Background Art
[0002] At present, the back-contact battery has a higher conversion efficiency than PERC, TOPCon, etc., because its positive and negative electrodes are both set on the back side, and there is no main grid line and welding point blocking the front of the battery. It can be combined with battery technologies such as TOPCon and HJT to further improve the battery conversion efficiency. It has become one of the hot research directions in the industry. At present, the conduction method of back-contact battery cells is generally to use welding ribbons to weld two halves together to form a solar cell. However, during the welding process, the welding ribbon is prone to shifting, resulting in poor accuracy of the welding position between the welding ribbon and the battery cell, affecting the conduction effect between the battery cells, thereby affecting the quality of the solar cell.
[0003] In view of this, it is particularly important to design and manufacture a solar cell sheet, a cell string and a photovoltaic module with high welding accuracy, especially in the production of solar cells. Utility Model Content
[0004] The utility model aims to provide a solar cell sheet, which can prevent the welding strip from shifting during the welding process, improve the welding accuracy, ensure the conduction effect between the solar cells, and improve the product quality.
[0005] Another purpose of the utility model is to provide a battery string that can prevent the welding strip from shifting during the welding process, improve welding accuracy, ensure the conduction effect between battery cells, and improve product quality.
[0006] Another object of the utility model is to provide a photovoltaic module, which can prevent the welding strip from shifting during the welding process, improve the welding accuracy, ensure the conduction effect between the battery cells, and improve the product quality.
[0007] The utility model is realized by adopting the following technical solutions.
[0008] A solar cell comprises a first half cell, a second half cell, a positioning adhesive and a first welding strip, wherein a first electrode is arranged on the back side of the first half cell, a second electrode is arranged on the back side of the second half cell, the polarity of the first electrode is opposite to that of the second electrode, the positioning adhesive is adhered to the first half cell and / or the second half cell, the positioning adhesive is used to bond with the first welding strip to achieve pre-positioning of the first welding strip, and the first welding strip is simultaneously welded to the first electrode and the second electrode to electrically connect the first electrode and the second electrode.
[0009] Optionally, the positioning glue includes a first positioning glue and a second positioning glue, the first positioning glue is adhered to the back side of the first half piece, the second positioning glue is adhered to the back side of the second half piece, and both the first positioning glue and the second positioning glue are bonded to the first welding strip.
[0010] Optionally, the first half sheet and the second half sheet are arranged sequentially in the first direction, the first positioning glue, the second positioning glue, the first electrode and the second electrode are all located on the same straight line along the first direction, and the first welding strip is in the shape of a straight strip.
[0011] Optionally, the number of the first positioning glue and the number of the second positioning glue are at least two, at least two first positioning glues are arranged on both sides of the first electrode relative to each other in the first direction, and at least two second positioning glues are arranged on both sides of the second electrode relative to each other in the first direction.
[0012] Optionally, the first positioning glue is spaced apart from the first electrode, and the spacing between the first positioning glue and the first electrode is in the range of 1 mm to 8 mm; the second positioning glue is spaced apart from the second electrode, and the spacing between the second positioning glue and the second electrode is in the range of 1 mm to 8 mm.
[0013] Optionally, the size range of the first positioning glue and the second positioning glue are both 0.2 mm to 0.8 mm.
[0014] Optionally, a third electrode is further provided on the back side of the first half sheet, and the number of the first electrode and the number of the third electrode are both multiple; the multiple first electrodes are divided into multiple first electrode groups, the multiple first electrodes in the first electrode group are arranged in sequence along the first direction, and the multiple first electrode groups are arranged in sequence along the second direction, and the first direction is perpendicular to the second direction; the multiple third electrodes are divided into multiple third electrode groups, the multiple third electrodes in the third electrode group are arranged in sequence along the first direction, and the multiple third electrode groups are arranged in sequence along the second direction; the multiple first electrode groups and the multiple third electrode groups are arranged alternately and staggered in sequence.
[0015] Optionally, the number of first electrodes in the first electrode group ranges from 100 to 220, and the number of first electrode groups ranges from 10 to 24; the number of third electrodes in the third electrode group ranges from 100 to 220, and the number of third electrode groups ranges from 10 to 24.
[0016] Optionally, a fourth electrode is further provided on the back side of the second half sheet, and the number of the second electrodes and the number of the fourth electrodes are both multiple; the multiple second electrodes are divided into multiple second electrode groups, the multiple second electrodes in the second electrode groups are arranged in sequence along the first direction, and the multiple second electrode groups are arranged in sequence along the second direction, and the first direction is perpendicular to the second direction; the multiple fourth electrodes are divided into multiple fourth electrode groups, the multiple fourth electrodes in the fourth electrode groups are arranged in sequence along the first direction, and the multiple fourth electrode groups are arranged in sequence along the second direction; the multiple second electrode groups and the multiple fourth electrode groups are arranged alternately and staggered in sequence.
[0017] Optionally, the number of second electrodes in the second electrode group ranges from 100 to 220, and the number of second electrode groups ranges from 10 to 24; the number of fourth electrodes in the fourth electrode group ranges from 100 to 220, and the number of fourth electrode groups ranges from 10 to 24.
[0018] Optionally, the first electrode and the second electrode are both arranged in a rectangular shape, the length of the first electrode and the second electrode are both in a range of 0.02 mm to 1.2 mm, and the width of the first electrode and the second electrode are both in a range of 0.02 mm to 1.2 mm.
[0019] A battery string comprises a plurality of second welding strips and a plurality of the above-mentioned solar cells, wherein the plurality of solar cells are arranged in sequence in a first direction, and two adjacent solar cells are connected by the second welding strips, and the solar cells comprise a first half cell, a second half cell, a positioning glue and a first welding strip, a first electrode is arranged on the back side of the first half cell, a second electrode is arranged on the back side of the second half cell, the first electrode and the second electrode have opposite polarities, the positioning glue is adhered to the first half cell and / or the second half cell, the positioning glue is used to bond with the first welding strip to achieve pre-positioning of the first welding strip, and the first welding strip is simultaneously welded to the first electrode and the second electrode to electrically connect the first electrode and the second electrode.
[0020] A photovoltaic module comprises the above-mentioned battery string, the battery string comprises a plurality of second welding strips and a plurality of the above-mentioned solar cells, the plurality of solar cells are arranged in sequence in a first direction, two adjacent solar cells are connected by the second welding strip, the solar cell comprises a first half cell, a second half cell, a positioning glue and a first welding strip, a first electrode is arranged on the back side of the first half cell, a second electrode is arranged on the back side of the second half cell, the first electrode and the second electrode have opposite polarities, the positioning glue is adhered to the first half cell and / or the second half cell, the positioning glue is used to bond with the first welding strip to achieve pre-positioning of the first welding strip, and the first welding strip is simultaneously welded to the first electrode and the second electrode to electrically connect the first electrode and the second electrode.
[0021] The solar cell, battery string and photovoltaic module provided by the utility model have the following characteristics:
[0022] Beneficial effects:
[0023] The solar cell provided by the utility model has a first electrode disposed on the back side of the first half of the cell, and a second electrode disposed on the back side of the second half of the cell, the first electrode and the second electrode have opposite polarities, a positioning glue is adhered to the first half of the cell and / or the second half of the cell, the positioning glue is used to bond with the first welding strip to achieve pre-positioning of the first welding strip, and the first welding strip is welded to the first electrode and the second electrode at the same time to electrically connect the first electrode and the second electrode. Compared with the prior art, the solar cell provided by the utility model adopts the first welding strip welded to the first electrode and the second electrode at the same time and the positioning glue bonded to the first welding strip, so that the welding strip can be prevented from shifting during the welding process, the welding accuracy is improved, the conduction effect between the solar cells is ensured, and the product quality is improved.
[0024] The battery string provided by the utility model includes solar cell sheets, which can prevent the welding strip from shifting during the welding process, improve the welding accuracy, ensure the conduction effect between the battery sheets, and improve the product quality.
[0025] The photovoltaic assembly provided by the utility model includes a battery string, which can prevent the welding strip from shifting during the welding process, improve the welding accuracy, ensure the conduction effect between the battery sheets, and improve the product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0027] Figure 1 A schematic diagram of the structure of a solar cell provided in the first embodiment of the utility model;
[0028] Figure 2 A schematic diagram of the structure of the first half of a solar cell provided in the first embodiment of the utility model;
[0029] Figure 3 A schematic diagram of the structure of the second half of the solar cell provided in the first embodiment of the utility model;
[0030] Figure 4 This is a schematic diagram of the structure of a battery string provided in the second embodiment of the present utility model.
[0031] Icon: 10-battery string; 100-solar cell; 110-first half cell; 111-first electrode; 112-third electrode; 120-second half cell; 121-second electrode; 122-fourth electrode; 130-first positioning glue; 140-second positioning glue; 150-first welding strip; 170-third positioning glue; 180-fourth positioning glue; 200-second welding strip. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0035] In the description of the present utility model, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" 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 ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0037] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.
[0038] First embodiment
[0039] Please refer to Figures 1 to 3 The embodiment of the utility model provides a solar cell 100 for converting solar energy into electrical energy. It can prevent the welding strip from shifting during welding, improve welding accuracy, ensure the conduction effect between the cells, and improve product quality.
[0040] The solar cell 100 includes a first half cell 110, a second half cell 120, a positioning adhesive and a first welding strip 150. The first half cell 110 is provided with a first electrode 111, and the second half cell 120 is provided with a second electrode 121, and the polarities of the first electrode 111 and the second electrode 121 are opposite. Specifically, the positioning adhesive is adhered to the first half cell 110 and / or the second half cell 120, and the positioning adhesive is used to bond with the first welding strip 150 to achieve pre-positioning of the first welding strip 150, prevent the first welding strip 150 from shifting during the subsequent welding process, and ensure the welding accuracy of the first welding strip 150 and the first electrode 111 and the second electrode 121, thereby ensuring the conduction effect between the first half cell 110 and the second half cell 120 and improving the product quality. The first welding strip 150 is welded to the first electrode 111 and the second electrode 121 at the same time, so that the first electrode 111 and the second electrode 121 are electrically connected, and the electrical connection of the first half cell 110 and the second half cell 120 is achieved.
[0041] In this embodiment, the positioning glue includes a first positioning glue 130 and a second positioning glue 140. The first positioning glue 130 is adhered to the first half sheet 110, and the position of the first positioning glue 130 corresponds to the position of the first electrode 111. The second positioning glue 140 is adhered to the second half sheet 120, and the position of the second positioning glue 140 corresponds to the position of the second electrode 121. Specifically, the first positioning glue 130 and the second positioning glue 140 are both bonded to the first solder strip 150 to achieve pre-positioning of the first solder strip 150 and improve the pre-positioning effect.
[0042] Furthermore, during the welding process of the solar cell 100, the first half cell 110 and the second half cell 120 are first placed at a preset position; then glue is dispensed on the first half cell 110 to form a first positioning glue 130, and glue is dispensed on the second half cell 120 to form a second positioning glue 140; then the first welding strip 150 is simultaneously bonded to the first positioning glue 130 and the second positioning glue 140 to fix the relative positions of the first welding strip 150 and the first half cell 110 and the second half cell 120, and to make the first welding strip 150 simultaneously adhere to the first electrode 111 and the second electrode 121; finally, the first welding strip 150 is simultaneously welded to the first electrode 111 and the second electrode 121 by low-temperature welding to achieve conduction between the first electrode 111 and the second electrode 121, thereby achieving electrical connection between the first half cell 110 and the second half cell 120.
[0043] In this embodiment, the first half sheet 110 and the second half sheet 120 are both provided with chamfers, and the positive and negative polarities of the battery can be distinguished by the setting position of the chamfers, wherein the first half sheet 110 is half of the back-contact battery after the whole sheet is cut in half, and the second half sheet 120 is the other half of the back-contact battery after the whole sheet is cut in half. The first half sheet 110 overlaps with the second half sheet 120 after rotating 180 degrees.
[0044] In this embodiment, the first welding strip 150 is simultaneously welded to the first electrode 111 and the second electrode 121 by a low-temperature welding method of 120 degrees Celsius to 155 degrees Celsius, which can effectively reduce the thermal stress generated by the first half piece 110 and the second half piece 120 during the welding process, avoid deformation or warping and other undesirable phenomena, and ensure the product yield.
[0045] In this embodiment, the first half sheet 110 and the second half sheet 120 are arranged in sequence in the first direction, the first positioning glue 130, the second positioning glue 140, the first electrode 111 and the second electrode 121 are all located on the same straight line along the first direction, and the first welding strip 150 is in the shape of a straight strip, so that the first welding strip 150 can be simultaneously attached to the first positioning glue 130, the second positioning glue 140, the first electrode 111 and the second electrode 121, thereby ensuring the pre-positioning effect, improving the welding accuracy, and being able to shorten the length of the first welding strip 150 as much as possible to save material costs.
[0046] Further, the number of the first positioning glue 130 and the second positioning glue 140 is at least two, at least two first positioning glues 130 are relatively arranged on both sides of the first electrode 111 in the first direction, and at least two second positioning glues 140 are relatively arranged on both sides of the second electrode 121 in the first direction. In this embodiment, the number of the first positioning glue 130 and the second positioning glue 140 is two, and the two first positioning glues 130 and the two second positioning glues 140 are located on the same straight line along the first direction. The two first positioning glues 130 are relatively arranged on both sides of the first electrode 111 in the first direction, and the two first positioning glues 130 are bonded to the first welding strip 150 to fix the position of the first welding strip 150 on both sides of the first electrode 111, further improving the pre-positioning effect, and ensuring the accuracy of the welding position of the first welding strip 150 and the first electrode 111. The two second positioning glues 140 are arranged relatively on both sides of the second electrode 121 in the first direction. The two second positioning glues 140 are both bonded to the first welding strip 150 to fix the position of the first welding strip 150 on both sides of the second electrode 121, further improving the pre-positioning effect and ensuring the accuracy of the welding position of the first welding strip 150 and the second electrode 121.
[0047] It should be noted that the first positioning glue 130 is spaced apart from the first electrode 111, and the spacing between the first positioning glue 130 and the first electrode 111 ranges from 1 mm to 8 mm. A reasonable spacing between the first positioning glue 130 and the first electrode 111 can shorten the length of the first welding strip 150 as much as possible while ensuring the pre-positioning effect, thereby saving material costs. The second positioning glue 140 is spaced apart from the second electrode 121, and the spacing between the second positioning glue 140 and the second electrode 121 ranges from 1 mm to 8 mm. A reasonable spacing between the second positioning glue 140 and the second electrode 121 can shorten the length of the first welding strip 150 as much as possible while ensuring the pre-positioning effect, thereby saving material costs.
[0048] Furthermore, the size range of the first positioning glue 130 and the second positioning glue 140 is 0.2 mm to 0.8 mm (the size of the first positioning glue 130 and the second positioning glue 140 needs to be determined according to their shapes). In the present embodiment, the first positioning glue 130 and the second positioning glue 140 are both circular, and the diameter range of the first positioning glue 130 and the second positioning glue 140 is 0.2 mm to 0.8 mm. The reasonable diameter of the first positioning glue 130 and the second positioning glue 140 can minimize the amount of glue while ensuring the pre-positioning effect, saving material costs. However, it is not limited to this. In other embodiments, the first positioning glue 130 and the second positioning glue 140 are both rectangular. At this time, the length and width range of the first positioning glue 130 and the second positioning glue 140 are both 0.2 mm to 0.8 mm, and the shape of the first positioning glue 130 and the second positioning glue 140 is not specifically limited.
[0049] In this embodiment, the first positioning glue 130 and the second positioning glue 140 are both transparent insulating glue, which can be transparent UV curing glue or other types of combined transparent curing glue. The first welding strip 150 is made of low temperature alloy materials such as SnBiPb, SnBiAg or SnBiIn.
[0050] Further, a third electrode 112 is also provided on the back side of the first half sheet 110, and the number of the first electrode 111 and the third electrode 112 are both multiple. The multiple first electrodes 111 are divided into multiple first electrode groups, and the multiple first electrodes 111 in the first electrode group are sequentially arranged at intervals along the first direction, and the multiple first electrode groups are sequentially arranged at intervals along the second direction, and the first direction is perpendicular to the second direction. The multiple third electrodes 112 are divided into multiple third electrode groups, and the multiple third electrodes 112 in the third electrode group are sequentially arranged at intervals along the first direction, and the multiple third electrode groups are sequentially arranged at intervals along the second direction. The multiple first electrode groups and the multiple third electrode groups are alternately and staggered in sequence; on the one hand, the multiple first electrodes 111 in the first electrode group and the multiple third electrodes 112 in the third electrode group are staggered in the first direction, and in the first direction, the multiple first electrodes 111 in the first electrode group and the multiple third electrodes 112 in the third electrode group are alternately arranged in sequence; on the other hand, in the second direction, the multiple first electrode groups and the multiple third electrode groups are alternately arranged in sequence.
[0051] In this embodiment, the first positioning glue 130 is divided into multiple groups, and the number of the first positioning glue 130 in each group is two; the number of the first welding strips 150 is multiple, and the two first positioning glues 130 in each group are bonded to one first welding strip 150 at the same time. The multiple first electrodes 111 in each group are sequentially arranged in intervals along the first direction, and are all located between the two first positioning glues 130 in each group. The two first positioning glues 130 in each group work together to simultaneously fix the relative positions of the first welding strip 150 and the multiple first electrodes 111 in each group, so as to facilitate the first welding strip 150 to be welded to the multiple first electrodes 111 in each group at the same time.
[0052] Preferably, the number of first electrodes 111 in the first electrode group ranges from 100 to 220, and the number of first electrode groups ranges from 10 to 24; the number of third electrodes 112 in the third electrode group ranges from 100 to 220, and the number of third electrode groups ranges from 10 to 24. The first electrode 111 and the second electrode 112 are both arranged in a rectangular shape, and the length of the first electrode 111 and the second electrode 112 ranges from 0.02 mm to 1.2 mm, and the width of the first electrode 111 and the second electrode 112 ranges from 0.02 mm to 1.2 mm.
[0053] Correspondingly, a fourth electrode 122 is also provided on the back side of the second half sheet 120, and the number of the second electrode 121 and the fourth electrode 122 are both multiple. The multiple second electrodes 121 are divided into multiple second electrode groups, and the multiple second electrodes 121 in the second electrode group are sequentially arranged at intervals along the first direction, and the multiple second electrode groups are sequentially arranged at intervals along the second direction, and the first direction is perpendicular to the second direction. The multiple fourth electrodes 122 are divided into multiple fourth electrode groups, and the multiple fourth electrodes 122 in the fourth electrode group are sequentially arranged at intervals along the first direction, and the multiple fourth electrode groups are sequentially arranged at intervals along the second direction. The multiple second electrode groups and the multiple fourth electrode groups are alternately and staggered in sequence; on the one hand, the multiple second electrodes 121 in the second electrode group and the multiple fourth electrodes 122 in the fourth electrode group are staggered in the first direction, and in the first direction, the multiple second electrodes 121 in the second electrode group and the multiple fourth electrodes 122 in the fourth electrode group are alternately arranged in sequence; on the other hand, in the second direction, the multiple second electrode groups and the multiple fourth electrode groups are alternately arranged in sequence.
[0054] In this embodiment, the second positioning glue 140 is divided into multiple groups, and the number of the second positioning glue 140 in each group is two, and the two second positioning glues 140 in each group are simultaneously bonded to one first welding strip 150. The multiple second electrodes 121 in each group are sequentially arranged in intervals along the first direction, and are all located between the two second positioning glues 140 in each group. The two second positioning glues 140 in each group work together to simultaneously fix the relative positions of the first welding strip 150 and the multiple second electrodes 121 in each group, so as to facilitate the first welding strip 150 to be welded to the multiple second electrodes 121 in each group at the same time.
[0055] Preferably, the number of second electrodes 121 in the second electrode group ranges from 100 to 220, and the number of second electrode groups ranges from 10 to 24; the number of fourth electrodes 122 in the fourth electrode group ranges from 100 to 220, and the number of fourth electrode groups ranges from 10 to 24. The second electrode 121 and the fourth electrode 122 are both arranged in a rectangular shape, and the length of the second electrode 121 and the fourth electrode 122 ranges from 0.02 mm to 1.2 mm, and the width of the second electrode 121 and the fourth electrode 122 ranges from 0.02 mm to 1.2 mm.
[0056] Specifically, the third electrode 112 has an opposite polarity to the first electrode 111, and the fourth electrode 122 has an opposite polarity to the second electrode 121. In this embodiment, the first electrode 111 and the fourth electrode 122 are both negative electrodes, and the second electrode 121 and the third electrode 112 are both positive electrodes.
[0057] In the solar cell 100 provided by the embodiment of the utility model, a first electrode 111 is arranged on the back side of the first half cell 110, and a second electrode 121 is arranged on the back side of the second half cell 120. The polarities of the first electrode 111 and the second electrode 121 are opposite. A positioning glue is adhered to the first half cell 110 and / or the second half cell 120. The positioning glue is used to bond with the first welding strip 150 to achieve the pre-positioning of the first welding strip 150. The first welding strip 150 is welded to the first electrode 111 and the second electrode 121 at the same time, so that the first electrode 111 and the second electrode 121 are electrically connected. Compared with the prior art, the solar cell 100 provided by the utility model adopts the first welding strip 150 welded to the first electrode 111 and the second electrode 121 at the same time and the positioning glue bonded to the first welding strip 150, so that the welding strip can be prevented from shifting during the welding process, the welding accuracy is improved, the conduction effect between the solar cells is guaranteed, and the product quality is improved. The photovoltaic module has stable performance and high photoelectric conversion efficiency.
[0058] Second embodiment
[0059] Please refer to Figure 4 The embodiment of the utility model provides a photovoltaic module (not shown) for converting solar energy into electrical energy. The photovoltaic module includes a battery string 10 and a fixed frame (not shown), and the battery string 10 includes a plurality of second welding strips 200 and a plurality of solar cells 100. Among them, the basic structure and principle of the solar cell 100 and the technical effect produced are the same as those of the first embodiment. For the sake of brief description, for the parts not mentioned in this embodiment, reference can be made to the corresponding contents in the first embodiment.
[0060] It should be noted that the photovoltaic module includes a battery string 10 and a fixed frame (not shown), the battery string 10 is installed in the fixed frame, the fixed frame is used to support and position the battery string 10, and the battery string 10 is used to convert solar energy into electrical energy.
[0061] In this embodiment, the battery string 10 includes a plurality of second welding strips 200 and a plurality of solar cells 100. The plurality of solar cells 100 are arranged sequentially in the first direction, and two adjacent solar cells 100 are connected via the second welding strips 200, that is, the fourth electrode 122 of the second half cell 120 of a solar cell 100 is connected to the third electrode 112 of the first half cell 110 of an adjacent solar cell 100 via the second welding strips 200, so as to realize conduction of the plurality of solar cells 100 and improve the photoelectric conversion efficiency.
[0062] It is worth noting that a third positioning glue 170 is also provided on the back side of the first half sheet 110, and the position of the third positioning glue 170 corresponds to the position of the third electrode 112; a fourth positioning glue 180 is also provided on the back side of the second half sheet 120, and the position of the fourth positioning glue 180 corresponds to the position of the fourth electrode 122. The third positioning glue 170 and the fourth positioning glue 180 are both bonded to the second welding strip 200 to achieve pre-positioning of the second welding strip 200, prevent the second welding strip 200 from shifting during the subsequent welding process, and ensure the welding accuracy of the second welding strip 200 and the third electrode 112 and the fourth electrode 122, thereby ensuring the conduction effect between the second half sheet 120 of a solar cell 100 and the first half sheet 110 of an adjacent solar cell 100, thereby improving product quality. The second welding ribbon 200 is welded to the fourth electrode 122 of the second half 120 of one solar cell 100 and the third electrode 112 of the first half 110 of an adjacent solar cell 100 simultaneously, so as to conduct the two adjacent solar cells 100 .
[0063] In this embodiment, the third positioning glue 170 is divided into multiple groups, and the number of the third positioning glue 170 in each group is two; the number of the second welding strips 200 is multiple, and the two third positioning glues 170 in each group are bonded to one second welding strip 200 at the same time. The multiple third electrodes 112 in each group are sequentially arranged in intervals along the first direction, and are all located between the two third positioning glues 170 in each group. The two third positioning glues 170 in each group work together to simultaneously fix the relative positions of the second welding strip 200 and the multiple third electrodes 112 in each group, so as to facilitate the second welding strip 200 to be welded to the multiple third electrodes 112 in each group at the same time.
[0064] Accordingly, the fourth positioning glue 180 is divided into a plurality of groups, each group of the fourth positioning glue 180 has two fourth positioning glues; the number of the second welding strips 200 is a plurality, and two fourth positioning glues 180 in each group are bonded to one second welding strip 200 at the same time. The plurality of fourth electrodes 122 in each group are sequentially arranged in intervals along the first direction, and are all located between the two fourth positioning glues 180 in each group, and the two fourth positioning glues 180 in each group work together to simultaneously fix the relative positions of the second welding strip 200 and the plurality of fourth electrodes 122 in each group, so as to facilitate the second welding strip 200 to be welded to the plurality of fourth electrodes 122 in each group at the same time.
[0065] The beneficial effects of the battery string 10 and the photovoltaic assembly provided by the embodiment of the utility model are the same as those of the first embodiment, and will not be described in detail here.
[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A solar cell, characterized in that: The invention comprises a first half sheet (110), a second half sheet (120), a positioning glue and a first welding strip (150); a first electrode (111) is arranged on the back side of the first half sheet (110); a second electrode (121) is arranged on the back side of the second half sheet (120); the first electrode (111) and the second electrode (121) have opposite polarities; the positioning glue is adhered to the first half sheet (110) and / or the second half sheet (120); the positioning glue is used to bond with the first welding strip (150) to achieve pre-positioning of the first welding strip (150); the first welding strip (150) is simultaneously welded to the first electrode (111) and the second electrode (121) to electrically connect the first electrode (111) and the second electrode (121).
2. The solar cell according to claim 1, characterized in that: The positioning glue comprises a first positioning glue (130) and a second positioning glue (140), wherein the first positioning glue (130) is adhered to the back side of the first half sheet (110), and the second positioning glue (140) is adhered to the back side of the second half sheet (120), and the first positioning glue (130) and the second positioning glue (140) are both bonded to the first welding strip (150).
3. The solar cell according to claim 2, characterized in that: The first half sheet (110) and the second half sheet (120) are arranged in sequence in a first direction, the first positioning glue (130), the second positioning glue (140), the first electrode (111) and the second electrode (121) are all located on the same straight line along the first direction, and the first welding strip (150) is in the shape of a straight line.
4. The solar cell according to claim 2, characterized in that: The number of the first positioning glue (130) and the number of the second positioning glue (140) are both at least two, at least two of the first positioning glue (130) are arranged on both sides of the first electrode (111) in a first direction, and at least two of the second positioning glue (140) are arranged on both sides of the second electrode (121) in a first direction.
5. The solar cell according to claim 2, characterized in that: The first positioning glue (130) is spaced apart from the first electrode (111), and the distance between the first positioning glue (130) and the first electrode (111) is in the range of 1 mm to 8 mm; the second positioning glue (140) is spaced apart from the second electrode (121), and the distance between the second positioning glue (140) and the second electrode (121) is in the range of 1 mm to 8 mm.
6. The solar cell according to claim 2, characterized in that: The size range of the first positioning glue (130) and the second positioning glue (140) is 0.2 mm to 0.8 mm.
7. The solar cell according to claim 1, characterized in that: A third electrode (112) is also arranged on the back side of the first half sheet (110), and the number of the first electrode (111) and the third electrode (112) are both multiple; the multiple first electrodes (111) are divided into multiple first electrode groups, the multiple first electrodes (111) in the first electrode group are arranged in sequence along the first direction, and the multiple first electrode groups are arranged in sequence along the second direction, and the first direction is perpendicular to the second direction; the multiple third electrodes (112) are divided into multiple third electrode groups, the multiple third electrodes (112) in the third electrode group are arranged in sequence along the first direction, and the multiple third electrode groups are arranged in sequence along the second direction; the multiple first electrode groups and the multiple third electrode groups are arranged alternately and staggered in sequence.
8. The solar cell according to claim 7, characterized in that: The number of the first electrodes (111) in the first electrode group ranges from 100 to 220, and the number of the first electrode group ranges from 10 to 24; the number of the third electrodes (112) in the third electrode group ranges from 100 to 220, and the number of the third electrode group ranges from 10 to 24.
9. The solar cell according to claim 1, characterized in that: A fourth electrode (122) is also arranged on the back side of the second half sheet (120), and the number of the second electrode (121) and the fourth electrode (122) are both multiple; the multiple second electrodes (121) are divided into multiple second electrode groups, the multiple second electrodes (121) in the second electrode group are arranged in sequence along the first direction, and the multiple second electrode groups are arranged in sequence along the second direction, and the first direction is perpendicular to the second direction; the multiple fourth electrodes (122) are divided into multiple fourth electrode groups, the multiple fourth electrodes (122) in the fourth electrode group are arranged in sequence along the first direction, and the multiple fourth electrode groups are arranged in sequence along the second direction; the multiple second electrode groups and the multiple fourth electrode groups are arranged alternately and staggered in sequence.
10. The solar cell according to claim 9, characterized in that: The number of the second electrodes (121) in the second electrode group ranges from 100 to 220, and the number of the second electrode groups ranges from 10 to 24; the number of the fourth electrodes (122) in the fourth electrode group ranges from 100 to 220, and the number of the fourth electrode groups ranges from 10 to 24.
11. The solar cell according to claim 1, characterized in that: The first electrode (111) and the second electrode (121) are both arranged in a rectangular shape, the length of the first electrode (111) and the second electrode (121) are both in the range of 0.02 mm to 1.2 mm, and the width of the first electrode (111) and the second electrode (121) are both in the range of 0.02 mm to 1.2 mm.
12. A battery string, characterized in that: It comprises a plurality of second welding strips (200) and a plurality of solar cells according to any one of claims 1 to 11, wherein the plurality of solar cells are arranged in sequence in a first direction, and two adjacent solar cells are connected via the second welding strips (200).
13. A photovoltaic module, characterized in that: Comprising the battery string as claimed in claim 12.