Solar cell and cell string
By optimizing the electrode spacing and using insulating components in IBC cells, the problems of cell bending deformation and short circuits caused by insulating adhesive were solved, enabling the manufacture of high-quality, low-cost solar cells.
Patent Information
- Application Number
- CN202520015475.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-03
AI Technical Summary
In the manufacturing process of existing IBC batteries, the printing of insulating adhesive causes the battery body to bend and deform, affecting battery quality, increasing welding difficulty, and increasing the risk of short circuit.
Design a solar cell structure in which the distance L1 between the edge bus electrode and the current collector electrode is less than L2, reducing the use of insulating adhesive, and isolating the polarity region through electrical connection structure and insulating components to ensure the distance between the solder strip and the opposite polarity region and avoid short circuit.
It reduces the risk of short circuits in solar cells, decreases manufacturing costs, improves cell quality and welding yield, and expands the range of applications.
Smart Images
Figure CN223758665U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to solar cell technical field especially relates to a solar cell and battery string. BACKGROUND
[0002] The existing back contact cell includes metal wrap through (MWT) cell and interdigitated back contact (IBC) cell, etc. The IBC cell is a back contact photovoltaic cell with positive and negative metal electrodes arranged in an interdigitated manner on the back of the cell, and the front of the cell is not shielded by grid lines, effectively reducing optical loss and improving power generation efficiency.
[0003] In the prior art, during the process of manufacturing the IBC cell, in order to avoid that the solder strip connects two electrodes with different polarities at the same time during soldering, an insulating glue is usually printed on the two sides of the electrode and the fine grid near the electrode.
[0004] Since the insulating glue will generate shrinkage stress after drying, printing a large area of insulating glue will cause the body of the cell to be bent and deformed, thereby affecting the quality of the back contact cell finally obtained. SUMMARY
[0005] The utility model aims at providing a solar cell and battery string for reducing the printing of insulating glue and improving the quality of the solar cell.
[0006] In order to achieve the above-mentioned purpose, in a first aspect, the utility model provides a solar cell. The solar cell comprises a cell body, an edge bus electrode, an electrical connection structure and a current collecting electrode. Along a first direction, the cell body has two opposite edges. The edge bus electrode is formed on the cell body and adjacent to the edge of the cell body. The edge bus electrode extends along a second direction, and the first direction is different from the second direction. A plurality of electrical connection structures are arranged at intervals on the cell body and away from the edge of the cell body. The current collecting electrode is formed on the cell body; a plurality of current collecting electrodes extend along the first direction and are arranged at intervals along the second direction. Along the first direction, a plurality of current collecting electrodes located on the same straight line are arranged at intervals. Each electrical connection structure is electrically connected to at least one current collecting electrode with the same polarity, and the edge bus electrode intersects a plurality of current collecting electrodes with the same polarity. Along the first direction, the minimum distance between the center line of the edge bus electrode and the free end of the current collecting electrode adjacent to the edge bus electrode and opposite in polarity is L1; along the first direction, the minimum distance between the center line of the electrical connection structure and the free end of the current collecting electrode adjacent to the electrical connection structure and opposite in polarity is L2; L1 < L2; the extension direction of the center line of the edge bus electrode and the extension direction of the center line of the electrical connection structure are both consistent with the second direction.
[0007] The solar cell provided by the utility model, if the size of the battery body, the edge bus electrode and the current collecting electrode is unchanged, when L1 < L2, it indicates that the minimum distance between the center line of the electric connection structure and the free end of the current collecting electrode adjacent to the electric connection structure and opposite in polarity is increased compared with the minimum distance when L1 is equal to L2. Based on this, when the interconnection (for example, a solder strip) is connected corresponding to the electric connection structure of the first polarity, the distance between the solder strip and the free end of the current collecting electrode of the second polarity is increased compared with when L1 is equal to L2, and then the probability that the solder strip simultaneously connects two polarity areas is reduced or eliminated, thereby reducing or eliminating the risk of short circuit of the solar cell. Further, compared with when L1 is equal to L2, the utility model can reduce or avoid printing insulating glue at both ends of the current collecting electrode. At this time, not only can the manufacturing cost of the solar cell or the photovoltaic module be reduced, but also the probability of the battery body bending and deforming due to the shrinkage stress of the insulating glue after drying can be reduced or eliminated, thereby improving the quality of the solar cell. In addition, the soldering difficulty of the module due to the shrinkage stress and the risk of hidden cracks of the solar cell can be reduced, and the soldering yield of the solar cell can be improved.
[0008] In an implementation manner, the electric connection structure comprises intermediate bus electrodes; the intermediate bus electrodes are arranged in the second direction and are distributed in the first direction; and each intermediate bus electrode intersects with the current collecting electrodes of the same polarity.
[0009] In the case of adopting the above technical solution, the current collecting electrodes collect the carriers generated in the corresponding regions of the battery body, and the intermediate bus electrodes and the edge bus electrodes collect the carriers collected by the current collecting electrodes.
[0010] In an implementation manner, the electric connection structure further comprises intermediate connecting portions; and the intermediate connecting portions are arranged in the second direction and are distributed in the first direction.
[0011] In an implementation manner, the electric connection structure comprises a plurality of connecting portions distributed in the first direction; and each connecting portion is electrically connected with one current collecting electrode of the same polarity.
[0012] In the case of adopting the above technical solution, the solar cell can be a main grid-free solar cell, and the first surface and the second surface of the solar cell are not shielded by the main grid, thereby effectively reducing the optical loss and improving the power generation efficiency of the solar cell. Further, the content of the paste consumed for printing the main grid can be reduced, and the manufacturing cost of the solar cell can be reduced.
[0013] In combination with the foregoing description, the electric connection structure in the utility model has three different types of structures, and the selectivity is increased, so that the solar cell can be applied to different application scenarios, and the application range thereof is expanded.
[0014] In an implementation, 0.05mm < L1 < 1mm; L2 > 0.4mm.
[0015] In the above technical solution, when L1 is within the above range, the edge bus electrode and the free end of the current collecting electrode adjacent to the edge bus electrode and having opposite polarity are effectively isolated, the solar cell short circuit is avoided, and the edge region is effectively utilized; meanwhile, sufficient distance is ensured between the electrical connection structure and the free end of the current collecting electrode adjacent to the electrical connection structure and having opposite polarity, so that the solder strip has sufficient welding space in the subsequent component string welding process, thereby reducing or eliminating the probability that the solder strip simultaneously connects two polarity regions, and further reducing or eliminating the risk of solar cell short circuit. When L2 is within the above range, sufficient distance is further ensured between the electrical connection structure and the free end of the current collecting electrode adjacent to the electrical connection structure and having opposite polarity, so that the solder strip has sufficient welding space in the subsequent component string welding process.
[0016] In an implementation, the solar cell is a whole piece back contact cell; or, the solar cell is a cut piece back contact cell.
[0017] In the above technical solution, the solar cell can be applied to different application scenarios, and the application range is expanded.
[0018] In a second aspect, the utility model also provides a battery string. The battery string includes a plurality of interconnectors and a plurality of interval arranged solar cells as described in the above technical solution, and the interconnectors are connected with the electrical connection structure.
[0019] The battery string provided by the utility model has the same beneficial effects as the solar cell described in the above technical solution, and details are not repeated here.
[0020] In an implementation, when the battery string includes the solar cell described in the partial technical solution, the battery string further includes an edge insulation part and an edge bonding part. The edge insulation part and the edge bonding part are both adjacent to the edge bus electrode and are both closer to the center of the battery body relative to the edge bus electrode; the edge bonding part is electrically connected with the edge bus electrode through the lap bus electrode. In the first direction, the edge insulation part is arranged in at least part of the region of the current collecting electrode; the polarity of the current collecting electrode covered by the edge insulation part is opposite to the polarity of the edge bonding part. The interconnector is arranged on the edge bonding part and the edge insulation part in the second direction.
[0021] In the above technical solution, in the subsequent component string welding process, the edge insulation part can effectively isolate the edge bus electrode (or the current collecting electrode connected with the edge bus electrode) from the heteropolarity region, reduce or eliminate the probability that the solder strip simultaneously connects two polarity regions, and further reduce or eliminate the risk of solar cell short circuit.
[0022] In an implementation, along the first direction, the width of the interconnect is W, and L2≤1 / 2W. The battery string further comprises an intermediate insulating portion, which is away from the edge of the battery body. Along the first direction, the intermediate insulating portion covers at least the free end of the current collecting electrode. The polarity of the current collecting electrode covered by the intermediate insulating portion is opposite to the polarity of the electrical connection structure adjacent to the free end of the current collecting electrode, and the interconnect is arranged on the electrical connection structure at least along the second direction. Along the first direction, the length of the intermediate insulating portion is less than the length of the edge insulating portion.
[0023] With the above technical solution, in the subsequent string welding process of the assembly, the intermediate insulating portion can effectively separate the welding strip from the different polarity regions, reduce or eliminate the probability of the welding strip connecting two polarity regions at the same time, and further reduce or eliminate the risk of short circuit of the solar cell.
[0024] In an implementation, along the first direction, the width of the interconnect is W. When 2L2>W, L2>0.6mm, and W>1.2mm; and when 2L2≤W, L2>0.3mm, and W>1.0mm.
[0025] With the above technical solution, when 2L2>W, the interconnect (for example, the welding strip) cannot be electrically connected with the current collecting electrodes on both sides of the electrical connection structure to be connected, eliminating the possibility of the welding strip electrically connecting two electrical connection structures with different polarities at the same time, thereby eliminating the risk of short circuit of the solar cell. Based on this, printing of the insulating glue on both ends of the current collecting electrode can be avoided, thereby eliminating the possibility of the bending and deformation of the battery body due to the shrinkage stress of the insulating glue after drying, and improving the quality of the solar cell. It should be noted that a small amount of insulating glue can be printed on both ends of the current collecting electrode in order to improve the fault tolerance. BRIEF DESCRIPTION OF DRAWINGS
[0026] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:
[0027] Figure 1 A partial structure diagram of a solar cell provided with insulating glue in the prior art Figure 1 ;
[0028] Figure 2 A partial structure diagram of a solar cell provided with insulating glue in the prior art Figure 2 ;
[0029] Figure 3 A structure diagram of a solar cell provided with insulating glue in the prior art
[0030] Figure 4 Front view of a solar cell provided with insulating glue in the prior art;
[0031] Figure 5 Partial structure schematic view of a solar cell in an embodiment of the present application;
[0032] Figure 6 Partial structure schematic view of a solar cell in an embodiment of the present application Figure 5 after the edge insulating part is provided;
[0033] Figure 7 Partial structure schematic view of a solar cell in an embodiment of the present application Figure 5 after the edge insulating part and the middle insulating part are provided;
[0034] Figure 8 Partial structure schematic view of another solar cell in an embodiment of the present application;
[0035] Figure 9 Partial structure enlarged schematic view of Figure 8 .
[0036] Reference signs:
[0037] 10-insulating glue, 11-fine grid, 13-bus electrode, 14-cell body; 2-edge bus electrode, 3-electric connection structure, 30-middle bus electrode, 31-middle joint part, 32-joint part, 4-current collecting electrode, 5-edge joint part, 6-overlapping bus electrode, 7-edge insulating part, 8-middle insulating part. DETAILED DESCRIPTION
[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.
[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0040] In addition, the terms "first", "second", "third", "fourth" and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily described with their chronological order. Unless specified otherwise, the described features are applicable to any of the elements. The terms "comprise", "comprising", "include", "including", and the like specify the presence of stated features but do not preclude the presence or addition of one or more other features.
[0041] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and 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 particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0042] In the description of the present application, it should be understood that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0043] Referring to Figures 1 to 4 In the prior art, in the process of manufacturing IBC battery, in order to avoid the welding of the welding strip connecting two electrodes of different polarity (i.e. the bus electrode 13) at the same time, the insulating glue 10 is usually printed on the two sides of the electrode and the fine grid 11 near the electrode.
[0044] Because the insulating glue will produce shrinkage stress after drying, printing a large area of insulating glue 10 will cause the battery body 14 to be bent and deformed, thereby affecting the quality of the back contact battery finally obtained.
[0045] In order to solve the above technical problems, in a first aspect, the present application provides a solar cell. Referring to Figures 5 to 9The solar cell comprises a cell body, an edge busbar 2, an electrical connection structure 3 and a current collecting electrode 4. The cell body has two opposite edges in a first direction A. The edge busbar 2 is formed on the cell body and adjacent to the edge of the cell body. The edge busbar 2 extends in a second direction B, and the first direction A is different from the second direction B. A plurality of electrical connection structures 3 are arranged on the cell body and away from the edge of the cell body. The current collecting electrode 4 is formed on the cell body; a plurality of current collecting electrodes 4 extend in the first direction A and are spaced apart in the second direction B. In the first direction A, a plurality of current collecting electrodes 4 on the same straight line are spaced apart. Each electrical connection structure 3 is electrically connected to at least one current collecting electrode 4 with the same polarity, and the edge busbar 2 intersects a plurality of current collecting electrodes 4 with the same polarity. In the first direction A, the minimum distance between the center line of the edge busbar 2 and the free end of the current collecting electrode 4 adjacent to the edge busbar 2 and opposite in polarity is L1; in the first direction A, the minimum distance between the center line of the electrical connection structure 3 and the free end of the current collecting electrode 4 adjacent to the electrical connection structure 3 and opposite in polarity is L2; L1 < L2; the extension direction of the center line of the edge busbar 2 and the extension direction of the center line of the electrical connection structure 3 are both consistent with the second direction B.
[0046] The structure and specifications of the above-mentioned cell body, the shape and material of the edge busbar can be set according to actual conditions, which are not specifically limited here. Further, the first direction and the second direction can be two directions parallel to the surface of the cell body and different from each other. Preferably, referring to Figure 5 The first direction A and the second direction B are orthogonal. Further, the above-mentioned corresponding structural features can be structural features of the entire area of the solar cell, or structural features of part of the area of the solar cell.
[0047] Referring to Figures 5 to 9The solar cell provided by the embodiment of the utility model, if the size of the battery body, the edge bus electrode 2 and the current collecting electrode 4 is invariable, when L1 < L2, it indicates that the minimum distance between the center line of the electric connection structure 3 and the free end of the current collecting electrode 4 adjacent to the electric connection structure 3 and opposite in polarity is increased compared with the minimum distance when L1 is equal to L2. Based on this, when the interconnection (for example, the solder strip) is connected corresponding to the electric connection structure 3 of the first polarity, the distance between the solder strip and the free end of the current collecting electrode 4 of the second polarity is increased compared with when L1 is equal to L2, and then the probability that the solder strip simultaneously connects two polarity areas is reduced or eliminated, thereby reducing or eliminating the risk of short circuit of the solar cell. Further, compared with when L1 is equal to L2, the embodiment of the utility model can reduce or avoid printing the insulating glue at both ends of the current collecting electrode 4. At this time, not only the manufacturing cost of the solar cell or the photovoltaic module can be reduced, but also the probability that the battery body is bent and deformed due to the shrinkage stress of the insulating glue after drying can be reduced or eliminated, thereby improving the quality of the solar cell. In addition, the difficulty of module welding and the risk of solar cell hidden cracking due to shrinkage stress can be reduced, and the welding yield of the solar cell is improved.
[0048] As a possible implementation manner, refer to Figure 5 and Figure 9 0.05mm < L1 < 1mm; for example, L1 can be 0.051mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm or 0.99mm, etc. When L1 is in the above value range, not only can the edge bus electrode 2 and the free end of the current collecting electrode 4 adjacent to the edge bus electrode 2 and opposite in polarity be effectively isolated, avoiding the short circuit of the solar cell and realizing the effective utilization of the edge area; but also the distance between the electric connection structure 3 and the free end of the current collecting electrode 4 adjacent to the electric connection structure 3 and opposite in polarity can be ensured to have enough distance, so that the solder strip has enough welding space in the subsequent module string welding process, thereby reducing or eliminating the probability that the solder strip simultaneously connects two polarity areas, to further reduce or eliminate the risk of short circuit of the solar cell.
[0049] Further, refer to Figure 5 and Figure 9L2>0.4mm; for example, L2 can be 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm or 0.9mm, etc. When L2 is within the above range, it further ensures that there is sufficient distance between the electrical connection structure 3 and the free end of the current collecting electrode 4 adjacent to the electrical connection structure 3 and having opposite polarity, so that the solder strip has sufficient welding space during subsequent component string welding.
[0050] The electrical connection structure is described below by way of three possible cases, and it should be understood that the following description is for understanding only and is not used for specific definition.
[0051] The first case: the electrical connection structure only includes intermediate bus bars; the plurality of intermediate bus bars extend along the second direction and are spaced apart along the first direction; and each intermediate bus bar intersects with a plurality of current collecting electrodes having the same polarity. In this case, the current collecting electrodes collect the carriers generated in the corresponding region of the battery body, and the intermediate bus bars and the edge bus bars collect the carriers collected by the current collecting electrodes.
[0052] The second case: referring to Figure 5 The electrical connection structure 3 includes intermediate bus bars 30 and intermediate junctions 31. The plurality of intermediate bus bars 30 extend along the second direction B and are spaced apart along the first direction A. Each intermediate bus bar 30 intersects with a plurality of current collecting electrodes 4 having the same polarity, and the plurality of intermediate junctions 31 are spaced apart along the second direction B on the intermediate bus bars 30.
[0053] The third case: referring to Figure 9 The electrical connection structure 3 only includes a plurality of spaced apart junctions 32, each junction 32 being electrically connected to a current collecting electrode 4 having the same polarity. In this case, the above-mentioned solar cell can be a main grid-free solar cell, which is not blocked by the main grid on the first and second surfaces, effectively reducing optical loss and improving the power generation efficiency of the solar cell. Further, the amount of paste consumed for printing the main grid can be reduced, thereby reducing the manufacturing cost of the solar cell. In this scheme, the edge bus bar 2 can be made of the same material as the current collecting electrode 4 in one step, thereby increasing the collection efficiency of the current.
[0054] In combination with the foregoing description, the electrical connection structure in the embodiments of the present application has three different types of structures, which increases the selectivity, so that the solar cell can be applied to different application scenarios, thereby expanding its application range.
[0055] For the solar cells corresponding to the above three types of electrical connection structures, referring to Figure 5 and Figure 6The edge busbar 2 is provided with a plurality of current collecting electrodes 4 with the same polarity at one side of the edge busbar 2 facing the middle region of the battery body and spaced apart along the second direction B.
[0056] As a possible implementation, for the solar cell corresponding to the first electric connection structure and the solar cell corresponding to the second electric connection structure (see Figure 5 ), the solar cell can further include an edge joint 5 and a lap busbar 6. One end of the lap busbar 6 is electrically connected with the edge busbar 2, and the other end of the lap busbar 6 is electrically connected with the edge joint 5. The lap busbar 6 is located between the edge busbar 2 and the middle busbar 30 adjacent to the edge busbar 2. In this case, during the subsequent assembly string welding process, the interconnector extending along the first direction A is electrically connected with the edge joint 5.
[0057] In the utility model embodiment, for the above-mentioned middle joint, joint and edge joint, they can be a pad, or an electrode thickening segment, or a local region of an electrode, as long as the connection between the cell and the interconnector can be realized.
[0058] As a possible implementation, the above-mentioned solar cell is a whole piece of back contact cell; or, the solar cell is a cut piece of back contact cell. In this way, the solar cell can be applied to different application scenarios, and its application range is expanded.
[0059] For example, when the solar cell is a cut piece of back contact cell, the whole piece of back contact cell can be cut along a cutting line located in a separation region. The separation region is not described in detail here, as long as it can meet the actual needs.
[0060] In the second aspect, the utility model embodiment further provides a battery string. The battery string includes a plurality of interconnectors and a plurality of solar cells arranged at intervals, and the interconnectors are connected with the electric connection structure.
[0061] The battery string provided by the utility model embodiment has the same beneficial effects as the solar cell provided by the above-mentioned technical solution, and details are not repeated here.
[0062] As a possible implementation, see Figure 6When the battery string includes other solar cells than the solar cell corresponding to the third electrical connection structure described in the first aspect, the battery string further includes the edge insulation part 7 and the edge bonding part 5. Both the edge insulation part 7 and the edge bonding part 5 are adjacent to the edge busbar and closer to the center of the solar cell body relative to the edge busbar 2; the edge bonding part 5 is electrically connected to the edge busbar 2 by the lapped busbar 6. In the first direction A, the edge insulation part 7 is arranged on at least part of the area of the current collecting electrode 4, and the polarity of the current collecting electrode 4 covered by the edge insulation part 7 is opposite to the polarity of the edge bonding part 5. The interconnector is arranged on the edge bonding part 5 and the edge insulation part 7 in the second direction B.
[0063] For example, for the solar cell corresponding to the first electrical connection structure and the solar cell corresponding to the second electrical connection structure described above (see Figures 5 to 7 and Figure 9 ), the interconnector is arranged on the edge insulation part 7 and the edge bonding part 5 in the second direction B. The length of the edge insulation part 7 is greater than or equal to the width of the interconnector, and both the length direction of the edge insulation part 7 and the width direction of the interconnector are consistent with the first direction A, so as to ensure that the interconnector cannot cross the edge insulation part 7 while connecting two polarity regions, and eliminate the risk of short circuit of the solar cell. Further, the straight line passing through the center point of the edge bonding part 5 in the second direction B coincides with the straight line passing through the center point of the edge insulation part 7 in the second direction B.
[0064] In summary, in the subsequent assembly string welding process, the edge insulation part 7 can effectively isolate the edge busbar 2 (or the current collecting electrode 4 connected to the edge busbar 2) from the opposite polarity region, reduce or eliminate the probability of the welding strip connecting two polarity regions at the same time, and further reduce or eliminate the risk of short circuit of the solar cell.
[0065] Further, referring to , in the first direction A, the width of the interconnector is W, and L2≤1 / 2W, the battery string further includes the middle insulation part 8, the middle insulation part 8 is away from the edge of the solar cell body, and the edge insulation part 7 is located between the middle insulation part 8 and the edge busbar 2. In the first direction A, the middle insulation part 8 covers at least the free end of the current collecting electrode 4. The polarity of the current collecting electrode 4 covered by the middle insulation part 8 is opposite to the polarity of the electrical connection structure 3 adjacent to the free end of the current collecting electrode 4, and the interconnector is arranged on the electrical connection structure 3 in the second direction B. In the first direction A, the length of the middle insulation part 8 is less than the length of the edge insulation part 5. For example, the length of one middle insulation part 8 arranged at the free end of the current collecting electrode 4 is less than the length of the edge insulation part 5.
[0066] For example, when L2 = 1 / 2W, the interconnect is arranged on the electrical connection structure 3 along the second direction B, and the edge of the interconnect along the first direction abuts against the edge of the intermediate insulating portion along the first direction.
[0067] When L2 < 1 / 2W, the interconnect is arranged on the electrical connection structure 3 and the intermediate insulating portion 8 along the second direction B.
[0068] With the above technical solution, in the subsequent assembly string welding process, the intermediate insulating portion 8 can effectively separate the solder strip from the heterogeneous polarity area, reduce or eliminate the probability of the solder strip connecting two polarity areas at the same time, and further reduce or eliminate the risk of short circuit of the solar cell.
[0069] As a possible implementation, see When the cell string includes the solar cell corresponding to the third electrical connection structure described in the first aspect, and the width of the interconnect along the first direction A is W, and L2 ≤ 1 / 2W, the intermediate insulating portion covers at least the free end of the current collecting electrode 4 along the first direction A. The polarity of the current collecting electrode 4 covered by the intermediate insulating portion is opposite to the polarity of the junction portion 32 adjacent to the free end of the current collecting electrode 4, and the interconnect is arranged on at least the junction portion 32 along the second direction B.
[0070] The shape, material, curing temperature, etc. of the above edge insulating portion and intermediate insulating portion are not specifically limited here. For example, the material of the above insulating portion can be various resins, organic silicone glue, inorganic silicone glue, various polymer glue film materials, and insulating medium mixed with adhesive material, etc.
[0071] As a possible implementation, the width of the interconnect along the first direction is W.
[0072] When 2L2 > W, L2 > 0.6mm, and W > 1.2mm; for example, L2 can be 0.61mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, or 0.9mm, etc. W can be 1.21mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, or 1.5mm, etc.
[0073] When 2L2 > W, the interconnect (such as a solder strip) will not be electrically connected to the current collecting electrodes on both sides of the electrical connection structure to be connected, eliminating the possibility of the solder strip electrically connecting two electrical connection structures of different polarities at the same time, thereby eliminating the risk of short circuit of the solar cell. Based on this, printing of insulating glue on both ends of the current collecting electrode can be avoided, thereby eliminating the possibility of bending and deformation of the cell body due to the shrinkage stress of the insulating glue after drying, and improving the quality of the solar cell. It should be noted that a small amount of insulating glue can be printed on both ends of the current collecting electrode in order to improve the fault tolerance.
[0074] When 2L2≤W, L2>0.3mm, and W>1.0mm. Exemplarily, L2 can be 0.31mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, or 0.99mm, etc. W can be 1.1mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, or 1.5mm, etc.
[0075] In the description of the above-mentioned embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.
[0076] The above describes only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the scope of protection of the claims.
Claims
1. A solar cell, characterized in that, include: Battery body; Along the first direction, the battery body has two opposing edges; An edge bus electrode is formed on the battery body and adjacent to the edge of the battery body; the edge bus electrode extends along a second direction; the first direction is different from the second direction; An electrical connection structure, wherein a plurality of the electrical connection structures are spaced apart on the battery body and are located away from the edge of the battery body; A current collector electrode is formed on the battery body; multiple current collector electrodes extend along the first direction and are spaced apart along the second direction; multiple current collector electrodes located on the same straight line along the first direction are spaced apart; each electrical connection structure is electrically connected to at least one current collector electrode of the same polarity; the edge bus electrode intersects with multiple current collector electrodes of the same polarity; Along the first direction, the minimum distance between the centerline of the edge bus electrode and the free end of the collector electrode adjacent to the edge bus electrode and having opposite polarity is L1; along the first direction, the minimum distance between the centerline of the electrical connection structure and the free end of the collector electrode adjacent to the electrical connection structure and having opposite polarity is L2; L1 < L2; the extension direction of the centerline of the edge bus electrode and the extension direction of the centerline of the electrical connection structure are both consistent with the second direction.
2. The solar cell according to claim 1, characterized in that, The electrical connection structure includes an intermediate bus electrode; multiple intermediate bus electrodes extend along the second direction and are spaced apart along the first direction; each intermediate bus electrode intersects with multiple collector electrodes of the same polarity.
3. The solar cell according to claim 2, characterized in that, The electrical connection structure further includes intermediate joints; a plurality of intermediate joints are spaced apart along the second direction on the intermediate bus electrode.
4. The solar cell according to claim 1, characterized in that, The electrical connection structure includes a plurality of spaced-apart joints; each of the joints is electrically connected to one of the current collector electrodes of the same polarity.
5. The solar cell according to claim 1, characterized in that, 0.05mm<L1<1mm; L2>0.4mm.
6. The solar cell according to any one of claims 1 to 5, characterized in that, The solar cell is a single-cell back-contact cell; or, the solar cell is a sliced back-contact cell.
7. A battery string, characterized in that, The solar cell as described in any one of claims 1 to 6 includes multiple interconnects and multiple spaced-apart components; the interconnects are correspondingly connected to the electrical connection structure.
8. The battery string according to claim 7, characterized in that, When the battery string includes the solar cell according to any one of claims 1 to 3 and 5, the battery string further includes an edge insulating portion and an edge bonding portion; both the edge insulating portion and the edge bonding portion are adjacent to the edge bus electrode and are closer to the center of the battery body relative to the edge bus electrode; the edge bonding portion is electrically connected to the edge bus electrode by overlapping the bus electrode; Along the first direction, the edge insulating portion is disposed in at least a portion of the current collecting electrode; The polarity of the current collector covered by the edge insulation portion is opposite to the polarity of the edge junction portion; The interconnecting element is disposed on the edge joint portion and the edge insulating portion along the second direction.
9. The battery string according to claim 8, characterized in that, Along the first direction, the width of the interconnect is W, L2≤1 / 2W, and the battery string further includes an intermediate insulating portion, which is located away from the edge of the battery body; Along the first direction, the intermediate insulating portion at least covers the free end of the current collecting electrode; The polarity of the current collector covered by the intermediate insulating portion is opposite to the polarity of the electrical connection structure adjacent to the free end of the current collector; the interconnect is disposed at least on the electrical connection structure along the second direction; along the first direction, the length of the intermediate insulating portion is less than the length of the edge insulating portion.
10. The battery string according to claim 7, characterized in that, Along the first direction, the width of the interconnect is W; When 2L2 > W, L2 > 0.6 mm, W > 1.2 mm; When 2L2≤W, L2>0.3mm, W>1.0mm.