Grid line structure of solar cell and solar cell using the same

Abstract

The present invention provides a grid line structure of a solar cell and a solar cell to which the grid line structure is applied, including a plurality of main grid lines extending along a first direction and arranged at intervals along a second direction, and a plurality of fine grid lines extending along the second direction and arranged at intervals along the first direction. The first direction and the second direction are not parallel, and the plurality of main grid lines are electrically connected to the plurality of fine grid lines respectively. Between any two adjacent main grid lines, each fine grid line has a discontinuous section. The grid line structure of the solar cell and the solar cell to which the grid line structure is applied according to the present invention can effectively reduce the consumption of silver paste and the preparation cost of the solar cell on the basis of ensuring the battery efficiency.

Description

Technical Field

[0001] The present invention mainly relates to the field of solar cells, and particularly to a grid line structure of a solar cell and a solar cell to which the grid line structure is applied. Background Art

[0002] Silver (Ag) has a low resistivity, can effectively transport carriers, and has low resistance loss, so it is widely used in the solar cell and electronics industries. However, as a precious metal, Ag has limited reserves and high costs. In existing solar cells, the cost of Ag accounts for about 70% of the non-silicon cost. Therefore, whether the silver consumption can be reduced while ensuring the battery efficiency is one of the main factors affecting the cost of photovoltaic power generation.

[0003] Specifically, in a solar cell, Ag is used as a metallized electrode to export carriers and transport the carriers to the external circuit. Specifically, in the process, silver is first ground into micro-nano scale particles, and then mixed with a viscous mixture composed of a binder, a solvent, an auxiliary agent, etc. These mixtures are printed on the battery by screen printing, and the pattern of the screen determines the pattern printed on the battery. The paste printed on the battery forms a silver electrode with good conductivity through drying and sintering.

[0004] Screen-printed silver cells have been a commonly used technology in the solar cell industry. The process is mature and the performance is stable. It is difficult to be replaced in the foreseeable future and is in an absolute dominant position. However, the price of silver paste has been increasing year by year. Other methods for preparing electrodes include electroplating and silver-coated copper particle methods. However, the electrodes prepared by electroplating generally consist of Ni / Cu / Ag, which can reduce the silver consumption. However, electroplating will generate a large amount of waste liquid, which contains various cations and toxic organic substances and cannot be directly discharged, and the treatment cost is also high. On this basis, the technology of silver-coated copper is not yet mature and has not been industrially applied. Therefore, screen printing technology still dominates and will continue to dominate the preparation of photovoltaic electrodes, and optimizing screen printing technology to reduce silver consumption has naturally become the top priority in the field. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a grid line structure of a solar cell and a solar cell to which the grid line structure is applied, which can effectively reduce the silver paste consumption on the basis of ensuring the battery efficiency and reduce the preparation cost of the solar cell.

[0006] To solve the above technical problems, the present invention provides a grid line structure for a solar cell, including a plurality of main grid lines extending along a first direction and arranged at intervals along a second direction, and a plurality of fine grid lines extending along the second direction and arranged at intervals along the first direction, wherein the first direction is not parallel to the second direction, and the plurality of main grid lines are respectively electrically connected to the plurality of fine grid lines. It is characterized in that between any two adjacent main grid lines, each fine grid line has a discontinuous section.

[0007] In an embodiment of the present invention, the length of the discontinuous section of each fine grid line in the second direction is a disconnection distance, and the disconnection distance is less than or equal to twice the distance between two adjacent fine grid lines.

[0008] In an embodiment of the present invention, the disconnection distances of the discontinuous sections of each fine grid line are equal.

[0009] In an embodiment of the present invention, between any two adjacent main grid lines, the discontinuous sections of the odd-numbered fine grid lines and the discontinuous sections of the even-numbered fine grid lines do not coincide or do not completely coincide in the first direction.

[0010] In an embodiment of the present invention, between any two adjacent main grid lines, the discontinuous sections of any two odd-numbered fine grid lines coincide in the first direction, and the discontinuous sections of any two even-numbered fine grid lines also coincide in the first direction.

[0011] In an embodiment of the present invention, any two adjacent main grid lines are a first main grid line and a second main grid line. Between the first main grid line and the second main grid line, one end of the discontinuous section of any fine grid line close to the first main grid line is a first end. Among them, the difference between the distance from the first end of the discontinuous section of any odd-numbered fine grid line to the first main grid line and the distance from the first end of the discontinuous section of an even-numbered fine grid line or another odd-numbered fine grid line to the first main grid line is a staggering distance. When the disconnection distances of each fine grid line are equal, the staggering distance is equal to the disconnection distance.

[0012] To solve the above problems, the present invention also proposes a solar cell, including a basic grid line structure, and the basic grid line structure is the above grid line structure.

[0013] In an embodiment of the present invention, the solar cell further includes a supplementary grid line structure. The supplementary grid line structure includes a plurality of main grid lines extending along a first direction and arranged at intervals along a second direction, and a plurality of fine grid lines extending along the second direction and arranged at intervals along the first direction. The first direction is not parallel to the second direction, and the plurality of main grid lines are respectively electrically connected to the plurality of fine grid lines. Between any two adjacent main grid lines, only odd-numbered fine grid lines or only even-numbered fine grid lines have discontinuous regions.

[0014] In an embodiment of the present invention, any three main grid lines arranged in sequence are the first main grid line, the second main grid line, and the third main grid line. A first region is formed between the first main grid line and the second main grid line, a second region is formed between the second main grid line and the third main grid line. The part of the first main grid line, the second main grid line, and multiple fine grid lines in the first region has the basic grid line structure, and the part of the second main grid line, the third main grid line, and multiple fine grid lines in the second region has the supplementary grid line structure.

[0015] In an embodiment of the present invention, any four main grid lines arranged in sequence are the first main grid line, the second main grid line, the third main grid line, and the fourth main grid line. A first region is formed between the first main grid line and the second main grid line, a second region is formed between the second main grid line and the third main grid line, and a third region is formed between the third main grid line and the fourth main grid line. The part of the first main grid line, the second main grid line, the third main grid line, and multiple fine grid lines in the first region and the second region is the supplementary grid line structure, and the part of the third main grid line, the fourth main grid line, and multiple fine grid lines in the third region is the basic grid line structure.

[0016] Compared with the prior art, the present invention has the following advantages: The grid line structure of the solar cell of the present invention and the solar cell to which it is applied are provided with disconnection sections on each fine grid line between adjacent main grid lines, effectively reducing the consumption of silver paste; on this basis, the disconnection sections of each grid line are arranged at specific positions, so as to effectively ensure the efficiency of the solar cell while reducing the consumption of silver paste, and overall reduce the manufacturing cost of the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are provided to provide a further understanding of the present application, and they are incorporated herein and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and, together with this specification, serve to explain the principles of the present invention. In the accompanying drawings:

[0018] Figure 1 is a schematic diagram of a grid line structure of a solar cell in the prior art;

[0019] Figure 2 is a schematic diagram of a grid line structure of a solar cell according to an embodiment of the present invention;

[0020] Figures 3a to 5 are respectively schematic diagrams of a grid line structure of a solar cell according to another embodiment of the present invention;

[0021] Figure 6 is a schematic diagram of the structure of a solar cell according to an embodiment of the present invention; and

[0022] Figure 7 It is a schematic structural diagram of a solar cell according to another embodiment of the present invention. Detailed implementation manners

[0023] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the figures represent the same structures or operations.

[0024] As shown in the present application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0025] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the said technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0026] In the description of the present application, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0027] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0028] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is merely for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some of the terms mentioned in the specification of this application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of this description. In addition, it is required to understand this application not only through the actual terms used, but also through the meaning implied by each term.

[0029] It should be understood that when a component is referred to as being "on another component", "connected to another component", "coupled to another component", or "in contact with another component", it can be directly on, connected to, or coupled to, or in contact with the other component, or there may be an intervening component. In contrast, when a component is referred to as being "directly on another component", "directly connected to", "directly coupled to", or "directly in contact with" another component, there is no intervening component. Similarly, when a first component is referred to as being "electrically in contact with" or "electrically coupled to" a second component, there is an electrical path allowing current to flow between the first component and the second component. The electrical path may include capacitors, coupled inductors, and / or other components allowing current to flow, even if there is no direct contact between the conductive components.

[0030] As Figure 1 shown, it is a schematic diagram of a grid line structure 10 of a solar cell in the prior art. According to Figure 1, the grid line structure 10 has two adjacent main grid lines 111 and 112. Between the two main grid lines 111 and 112, there are multiple fine grid lines 12. The above-mentioned main grid lines and fine grid lines are all arranged on the silicon wafer (in order to keep the drawings simple, the silicon wafer is not shown in Figure 1 ). On this basis, there is also an "H"-shaped line 13 between every two fine grid lines 12 to connect the adjacent two fine grid lines 12. As described above, using the grid line structure 10 as shown in Figure 1 , although the photoelectric conversion efficiency of the solar cell can be guaranteed, due to the preparation of multiple grid lines, especially multiple fine grid lines 12 among them, a large amount of silver paste is consumed, increasing the preparation cost of the solar cell, which is exactly the problem to be solved by the present invention.

[0031] An embodiment of the present invention proposes a grid line structure of a solar cell, which can effectively reduce the silver paste consumption on the basis of ensuring the cell efficiency and reduce the preparation cost of the solar cell.

[0032] As Figure 2 shown, it is a schematic diagram of the grid line structure 20 of the solar cell in this embodiment. According to Figure 2 , the grid line structure 20 includes multiple main grid lines 21 extending along the first direction X and arranged at intervals along the second direction Y. In Figure 2 , two adjacent main grid lines 211 and 212 are shown.

[0033] On the other hand, the grid line structure 20 also includes multiple fine grid lines 22 extending along the second direction Y and arranged at intervals along the first direction X. According to Figure 2 , it can be seen that the first direction X is not parallel to the second direction Y. More specifically, in the embodiment shown in Figure 2 , the first direction X is perpendicular to the second direction Y, but the present invention is not limited thereto. On this basis, multiple main grid lines 21 (such as the main grid lines 211 and 212 in the figure) are electrically connected to multiple fine grid lines 22 respectively.

[0034] Particularly, in the embodiment of the present invention as shown in Figure 2 , between the main grid lines 211 and 212, each fine grid line 22 has a disconnection section 220. Compared with the non-disconnected grid line structure 10 shown in Figure 1 , the disconnection sections 220 provided on each fine grid line 22 effectively reduce the silver paste consumption as a whole and save the preparation cost of the solar cell.

[0035] According to Figure 2 , the length of the disconnection section 220 of each fine grid line of the grid line structure 20 in the second direction Y is the disconnection distance d (that is, Figure 2The distance shown by the dashed line in the Y direction). In some embodiments of the present invention, the disconnection distance d is less than or equal to twice the pitch a between two adjacent fine grid lines. With such parameter settings, the grid line structure of the present invention can save the consumption of silver paste while minimizing the impact on the efficiency of the battery using the grid line structure of the present invention.

[0036] Furthermore, considering the appearance of the prepared solar cell and the manufacturing process, in the embodiment shown as Figure 2 the disconnection distance d of the disconnection section 220 of each fine grid line 22 is equal. And, between adjacent main grid lines 211 and 212, the disconnection sections of all fine grid lines 22 coincide in the first direction X.

[0037] However, the present invention does not limit whether the distances of the disconnection sections of each fine grid line are equal and whether they coincide in the first direction X in all embodiments. For example, in some other embodiments of the present invention, the disconnection sections of all fine grid lines 22 do not coincide or do not completely coincide in the first direction X, and the disconnection distances of each fine grid line are not necessarily equal. Figures 3a to 5 respectively show different situations from incomplete coincidence to non - coincidence. The following will refer to Figures 3a to 5 to illustrate the specific positions of the arrangement of the disconnection sections. For the sake of convenience of description, Figures 3a to 5 the situation where the disconnection distance d of the disconnection section is equal is selected.

[0038] In Figure 3a the shown embodiment, the grid line structure 30 has multiple main grid lines 31, where Figure 3a two adjacent main grid lines 311 and 312 and multiple fine grid lines 32 are shown. Among the multiple fine grid lines 32, the fine grid lines 321 and 323 are two of the odd - numbered fine grid lines. In Figure 3a the fine grid lines adjacent to all odd - numbered fine grid lines are even - numbered fine grid lines, such as the fine grid line 322. And, all odd - numbered fine grid lines and even - numbered fine grid lines have disconnection sections between adjacent main grid lines 311 and 312, such as the disconnection sections 3210 and 3230 of the odd - numbered fine grid lines 321 and 323, and the disconnection section 3220 of the even - numbered fine grid line 322.

[0039] It can be seen that, compared with the grid line structure 20 shown as Figure 2 in the grid line structure 30, multiple fine grid lines 32 between two adjacent main grid lines 311 and 312 also have disconnection sections, but the disconnection sections of each fine grid line 32 do not completely coincide in the first direction X. Specifically, in the example shown as Figure 3aIn the described embodiments, with reference to the auxiliary dashed line in the X direction, the gate line structure 30 is specifically described such that the discontinuous sections (such as the discontinuous section 3210) of the odd-numbered fine gate lines (such as the fine gate line 321) and the discontinuous sections (such as the discontinuous section 3220) of the even-numbered fine gate lines (such as the fine gate line 322) do not completely coincide in the first direction X.

[0040] More specifically, in the embodiment as Figure 3a shown, between the adjacent main gate lines 311 and 312, the discontinuous sections (correspondingly the discontinuous sections 3210 and 3230) of any two odd-numbered fine gate lines (such as the fine gate lines 321 and 323) coincide in the first direction X according to Figure 3a the dashed line shown in. Similarly, although not explicitly marked in Figure 3a for the sake of simplicity of the drawings, the discontinuous sections of any two even-numbered fine gate lines also coincide in the first direction X. However, the present invention is not limited thereto. For example, in some other embodiments of the present invention, the discontinuous sections of any two odd-numbered fine gate lines or any two even-numbered fine gate lines do not necessarily coincide in the first direction X.

[0041] Finally, regarding Figure 3a the markings t and d in and Figure 3b will be further described in detail below.

[0042] Figure 4 An embodiment of a gate line structure 40 in which the discontinuous sections of the fine gate lines do not coincide is shown. In the gate line structure 40, any two adjacent main gate lines 41 are respectively the first main gate line 411 and the second main gate line 412. Between the first main gate line 411 and the second main gate line 412, for any fine gate line 42 (such as the fine gate lines 421 and 422), the end close to the first main gate line 421 of the discontinuous section (for the sake of simplicity of the drawings, the discontinuous section is not specifically shown again in Figure 4 , and reference can be made to the above description according to Figure 2 and Figure 3a ) is the first end (respectively the first ends 4211 and 4221).

[0043] Furthermore, in Figure 4 , the fine gate line 421 is an odd-numbered fine gate line, while the fine gate line 422 is an even-numbered fine gate line. The difference between the distance between the first end 4211 of the discontinuous section of the odd-numbered fine gate line 421 and the first main gate line 411 and the distance between the first end 4221 of the discontinuous section of the even-numbered fine gate line 422 and the first main gate line 411 is the stagger distance t. As described above, in the embodiment shown in Figure 4 , the disconnection distance d of each fine gate line 42 is equal, and the above stagger distance t is equal to the disconnection distance d. Using as Figure 4The structure shown can achieve better cell efficiency while reducing the consumption of silver paste and thus the manufacturing cost of solar cells. This effect will be further explained and verified below.

[0044] Similarly, since in Figure 3a the illustrated embodiment, the disconnected sections of each fine grid line 32 in the grid line structure 30 do not completely coincide in the first direction X either. There is also a staggering distance t between the odd-numbered fine grid lines (such as the fine grid line 321) and the even-numbered fine grid lines (such as the fine grid line 322) in the first direction X. However, in Figure 3a the illustrated embodiment, the staggering distance t is only half of the disconnection distance d.

[0045] Furthermore, in some embodiments of the present invention, as Figure 3b shown, in the grid line structure 30', there are odd-numbered fine grid lines 323 and 325, and an even-numbered fine grid line 324 between two adjacent main grid lines 313 and 314. In the embodiment as Figure 3b shown, there is a staggering distance t between the odd-numbered fine grid line 323 and another odd-numbered fine grid line 325. The present invention does not limit whether the fine grid lines with a staggering distance are odd-numbered fine grid lines or even-numbered fine grid lines.

[0046] Furthermore, Figure 5 an embodiment of a grid line structure 50 is shown in which the disconnected sections of the fine grid lines do not coincide at all in the first direction X. The grid line structure 50 also has multiple main grid lines 51. Among them, multiple fine grid lines 52 between any two main grid lines 511 and 512 all have disconnected sections, and in Figure 5 the illustrated embodiment, obviously, the staggering distance t is greater than the disconnection distance d. Other details about Figure 5 the illustrated grid line structure 50 can be referred to the above description of Figures 2 to 4 and will not be elaborated here.

[0047] The above reference Figures 2 to 5 to the illustrated grid line structures 20-50 are different examples of the complete disconnection of the fine grid lines of the present invention. The differences between the grid line structures lie in the positions of the disconnected sections and the differences in the magnitudes between the disconnected sections and the staggering distance. Taking a solar cell with a side length of 158.75 mm as an example, only by changing the grid line structure, as the staggering distance increases, the efficiency first increases and then decreases. Taking the disconnection distance d = 2 mm as an example, as the staggering distance t changes, the efficiency data of the solar cells prepared by the corresponding Figures 2 to 5 grid line structures are shown in the following table. The Baseline in Table 1 is a reference structure without disconnection of the fine grid lines as Figure 1 shown:

[0048] Grouping Voc Isc FF Eff Baseline 709.348509 39.192504 82.268551 22.871598 Grid line structure 20 710.128805 39.271922 81.745977 22.797419 Grid line structure 30 710.209291 39.274807 81.800794 22.816968 Grid line structure 40 710.171149 39.271922 81.873599 22.834372 Grid line structure 50 710.176769 39.271922 81.856122 22.829678

[0049] Table 1: Performance comparison of solar cells made with different grid structures

[0050] Among them, Voc is the open circuit voltage, Isc is the short circuit current, FF is the fill factor, and Eff is the photoelectric conversion efficiency. The control conditions of each group are as follows:

[0051] Baseline: d = 0, t = 0;

[0052] Gate line structure 20: d = 2 mm, t = 0;

[0053] Gate line structure 30: d = 2 mm, t = 1 mm;

[0054] Gate line structure 40: d=2 mm, t=2 mm;

[0055] Gate line structure 50: d=2 mm, t=4 mm.

[0056] It can be seen that as the offset distance t increases, the efficiency first increases and then decreases. When the offset distance t is exactly equal to the disconnection distance d, the efficiency is the highest. That is, as mentioned above, Figure 4 The grid line structure 40 shown can have a higher efficiency under the same conditions. Figure 1 The Baseline of the reference case without disconnection is less than 0.05%, but the cost of silver consumption can be saved by about 15% when preparing solar cells. It can be seen that the grid line structure of the solar cell of the present invention can effectively reduce the silver paste consumption while ensuring the efficiency of the cell, thereby reducing the preparation cost of the solar cell.

[0057] On the other hand, in order to further verify the technical effect of the solar cell grid line structure of the present invention, the present invention is also compared with a comparative structure (Baseline) in which the thin grid lines are not completely disconnected between any adjacent main grid lines in the present invention and the prior art. When the silver consumption saved by the comparative structure and the grid line structure of the present invention is equal, for example, a disconnection distance of the comparative structure is selected as 2mm, and compared with the structure of the above-mentioned grid line structure 30 of the present invention, that is, the case of d=1mm and t=0 of the present invention. It can be concluded through experimental analysis that the efficiency of the solar cell prepared by the grid line structure of the present invention is better than that of the comparative structure, and the results are as follows:

[0058] Grouping Voc Isc FF Eff Baseline 709.348509 39.192504 82.268551 22.871598 The structure of the present invention 710.007267 39.244590 82.158923 22.892716 Comparative structure 709.923955 39.244590 82.078330 22.867576

[0059] Table 2: Performance comparison of solar cells prepared with the grid line structure of the present invention and the comparative structure

[0060] From the above description, especially the experimental data analysis results, it can be seen that by adopting the grid line structure of the solar cell of the present invention, the consumption of silver paste can be effectively reduced on the basis of ensuring the battery efficiency, thereby reducing the manufacturing cost of the solar cell. At the same time, compared with other comparative structures with the concept of saving silver paste consumption, the efficiency of the prepared solar cell also has better performance.

[0061] On the basis of the above grid line structure, on the other hand, the present invention also proposes a solar cell. The solar cell first includes a basic grid line structure, and the basic grid line structure is the grid line structure in which all the fine grid lines between two adjacent main grid lines described above have discontinuous sections. In addition, in some embodiments of the solar cell of the present invention, in addition to the above basic grid line structure, a supplementary grid line structure is further included. Figures 2 to 5 As shown in, the structure diagram of a solar cell 60 according to an embodiment of the present invention is shown. The solar cell 60 has the above basic grid line structure and supplementary grid line structure, which will be described in detail below.

[0062] As Figure 6 shown, it is a schematic structural diagram of a solar cell 60 according to an embodiment of the present invention. The solar cell 60 has the above basic grid line structure and supplementary grid line structure, and the following will be described in conjunction with Figure 6 to expand.

[0063] According to Figure 6 , the solar cell 60 has a plurality of main grid lines 61 and a plurality of fine grid lines 62. Among them, the three main grid lines arranged in sequence are the first main grid line 611, the second main grid line 612, and the third main grid line 613. According to Figure 6 , a first region 601 is formed between the first main grid line 611 and the second main grid line 612, and a second region 602 is formed between the second main grid line 612 and the third main grid line 613. In particular, the first main grid line 611, the second main grid line 612, and a part of the plurality of fine grid lines 62 in the first region 601 have a basic grid line structure 63. Figure 6 The basic grid line structure 63 in the first region 601 shown is specifically the grid line structure 20 shown in the above Figure 2 . However, the present invention is not limited thereto. For example, in some embodiments of the present invention, the basic grid line structure may also be Figures 3a to 5 the grid line structures 30-50 shown in.

[0064] Furthermore, in Figure 6 , the second main grid line 612, the third main grid line 613, and a part of the plurality of fine grid lines 62 in the second region 602 have a supplementary grid line structure 64. As can be seen from Figure 6 , the supplementary grid line structure 64 includes main grid lines 612 and 613 extending along the first direction X and spaced apart along the second direction Y, and a plurality of fine grid lines 62 extending along the second direction Y and spaced apart along the first direction X. Similarly, in Figure 6Among them, the first direction X and the second direction Y are not parallel, and more specifically, they are in a perpendicular relationship, but the present invention is not limited thereto.

[0065] Based on such a structure, the main grid lines 612 and 613 are respectively electrically connected to a plurality of fine grid lines 62, and between these two main grid lines 612 and 613, only the fine grid lines with odd serial numbers or only the fine grid lines with even serial numbers have disconnection regions. In Figure 6 Among them, if the fine grid line 621 is a fine grid line with an odd serial number, then the fine grid line 622 is a fine grid line with an even serial number. In Figure 6 In the illustrated embodiment, only the fine grid lines with even serial numbers in the supplementary grid line structure 64 have disconnection sections 620.

[0066] In such as Figure 6 In the illustrated embodiment, the basic grid line structure 63 and the supplementary grid line structure 64 are arranged at intervals. It can be understood that Figure 6 What is shown is only a part of the solar cell 60. Between any two main grid lines in the other unshown parts of the solar cell 60, a basic grid line structure 63 or a supplementary grid line structure 64 as shown in Figure 6 is also formed. And, for the specific positions of the disconnection sections in the basic grid line structure 63 and the supplementary grid line structure 64 as shown in Figure 6 the present invention does not make any restrictions.

[0067] From Figure 6 the perspective of the advantages of the solar cell 60 shown, if a battery entirely adopts the basic grid line structure, that is, all the fine grid lines between any two main grid lines are disconnected. Although the silver consumption can be greatly reduced to a large extent, there are still certain limitations. Especially in the application scenario of battery testing, the IV and EL test results show that such a completely disconnected design sometimes affects the test results of the battery. Therefore, the solar cell with all fine grid lines disconnected still has certain limitations during the application process.

[0068] Specifically, when the probe during testing cannot contact the battery or the contact between the probe and the battery is poor, obvious black blocks will appear in the EL test of the solar cell. These black blocks are mainly because the design of all fine grid lines being disconnected makes each main grid line and the fine grid lines connected thereto independent of each other. As a result, when the test probe on a certain main grid line does not contact the main grid or the contact is poor, the current at that position cannot be effectively transmitted, resulting in a decrease in efficiency during the IV test or local black blocks appearing during the EL test.

[0069] Adopting the present invention as shown in Figure 6The structural design in which the shown basic grid line structure and supplementary grid line structure are arranged at intervals enables the solar cell 60 to further improve the black block problem that may occur during battery testing, in addition to having the beneficial effect of saving silver paste consumption compared to a battery with an all-basic grid line structure.

[0070] In another embodiment of the present invention, as Figure 7 shown, the solar cell 70 also has a plurality of main grid lines 71 and a plurality of fine grid lines 72. Among them, any four sequentially arranged main grid lines are selected as the first main grid line 711, the second main grid line 712, the third main grid line 713, and the fourth main grid line 714. A first region 701 is formed between the first main grid line 711 and the second main grid line 712, a second region 702 is formed between the second main grid line 712 and the third main grid line 713, and a third region 703 is formed between the third main grid line 713 and the fourth main grid line 714.

[0071] Among them, the parts of the first main grid line 711, the second main grid line 712, the third main grid line 713, and the plurality of fine grid lines 72 in the first region 701 and the second region 702 are the supplementary grid line structure 74. The specific features of this supplementary grid line structure 74 can refer to the description of the supplementary grid line structure 64 in the above comparison Figure 6 and will not be elaborated here. The parts of the third main grid line 713, the fourth main grid line 714, and the plurality of fine grid lines 72 in the third region 703 are the basic grid line structure 73. This basic grid line structure 73 can also refer to the description in the above reference Figures 2 to 5 and will not be elaborated here.

[0072] Compared with the Figure 6 shown embodiment, the solar cell 70 also has a structural design in which the basic grid line structure and the supplementary grid line structure are arranged at intervals, but the way of interval is different from that of the solar cell 60. In the solar cell 70, one basic grid line structure 73 follows after every two supplementary grid line structures 74 as the basic grid line structure combination. While in the Figure 6 shown solar cell 60, it can be considered that the basic grid line structure combination is one basic grid line structure 73 followed by one supplementary grid line structure 74. According to the comparison of experimental results, compared with the Figure 6 shown solar cell 60, the solar cell 70 has a better improvement effect on the black block problem in the battery test application scenario.

[0073] The present invention refers to Figures 2 to 5 The described grid line structure can effectively save the silver paste consumption during the preparation of solar cells on the basis of ensuring the battery efficiency. On this basis, the solar cell proposed on the other hand by the present invention, in some embodiments such as Figure 6 and Figure 7As shown, on the basis of ensuring efficiency and saving the consumption of silver paste, the problem of black blocks in the battery test application scenario can be further improved.

[0074] The basic concepts have been described above. Obviously, for those skilled in the art, the above invention disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

[0075] Meanwhile, this application uses specific terms to describe the embodiments of this application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0076] Similarly, it should be noted that, in order to simplify the expression of this application disclosure and thus help the understanding of one or more invention embodiments, in the previous description of the embodiments of this application, sometimes multiple features are merged into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than those mentioned in the claims. In fact, the features of the embodiment are less than all the features of the single embodiment disclosed above.

[0077] In some embodiments, numbers describing the composition and attribute quantity are used. It should be understood that such numbers used for the description of embodiments are modified by the modifiers "about", "approximate", or "substantially" in some examples. Unless otherwise stated, "about", "approximate", or "substantially" indicate that the said numbers allow a change of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and such approximate values can change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining general digits. Although the numerical ranges and parameters used in some embodiments of this application to confirm the breadth of their scope are approximate values, in specific embodiments, such numerical settings are as precise as possible within the feasible range.

[0078] Although the present application has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions can be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A grid line structure of a solar cell, comprising a plurality of main grid lines extending along a first direction and arranged at intervals along a second direction, and a plurality of fine grid lines extending along the second direction and arranged at intervals along the first direction, wherein the first direction is not parallel to the second direction, and the plurality of main grid lines are electrically connected to the plurality of fine grid lines respectively, characterized in that, Between any two adjacent main grid lines, each fine grid line has a discontinuous section, where the length of the discontinuous section of each fine grid line in the second direction is the disconnection distance. Any two adjacent main grid lines are the first main grid line and the second main grid line. Between the first main grid line and the second main grid line, one end of the discontinuous section of any fine grid line close to the first main grid line is the first end. Wherein, the difference between the distance from the first end of the discontinuous section of any odd-numbered fine grid line to the first main grid line and the distance from the first end of the discontinuous section of an even-numbered fine grid line or another odd-numbered fine grid line to the first main grid line is the staggering distance. When the disconnection distances of each fine grid line are equal, the staggering distance is equal to the disconnection distance.

2. The gate line structure according to claim 1, wherein The disconnection distance is less than or equal to twice the spacing between two adjacent fine grid lines.

3. The gate line structure according to claim 2, wherein The disconnection distances of the discontinuous sections of each fine grid line are equal.

4. The gate line structure according to claim 2 or 3, characterized in that, Between any two adjacent main grid lines, the discontinuous sections of odd-numbered fine grid lines and the discontinuous sections of even-numbered fine grid lines do not overlap in the first direction.

5. The gate line structure according to claim 4, wherein Between any two adjacent main grid lines, the discontinuous sections of any two odd-numbered fine grid lines overlap in the first direction, and the discontinuous sections of any two even-numbered fine grid lines also overlap in the first direction.

6. A solar cell, characterized in that, It includes a basic grid line structure, and the basic grid line structure is the grid line structure according to any one of claims 1-5.

7. The solar cell according to claim 6, wherein, It further includes a supplementary grid line structure. The supplementary grid line structure includes multiple main grid lines extending along the first direction and arranged at intervals along the second direction, and multiple fine grid lines extending along the second direction and arranged at intervals along the first direction. The first direction is not parallel to the second direction, and the multiple main grid lines are electrically connected to the multiple fine grid lines respectively. Between any two adjacent main grid lines, only odd-numbered fine grid lines or only even-numbered fine grid lines have discontinuous sections.

8. The solar cell according to claim 7, wherein, Any three main grid lines arranged in sequence are the first main grid line, the second main grid line, and the third main grid line. A first region is formed between the first main grid line and the second main grid line, and a second region is formed between the second main grid line and the third main grid line. The first main grid line, the second main grid line, and the part of the multiple fine grid lines in the first region have the basic grid line structure. The second main grid line, the third main grid line, and the part of the multiple fine grid lines in the second region have the supplementary grid line structure.

9. The solar cell according to claim 7, wherein, Any four main grid lines arranged in sequence are the first main grid line, the second main grid line, the third main grid line, and the fourth main grid line. A first region is formed between the first main grid line and the second main grid line, a second region is formed between the second main grid line and the third main grid line, and a third region is formed between the third main grid line and the fourth main grid line. The part of the first main grid line, the second main grid line, the third main grid line, and the multiple fine grid lines in the first region and the second region is the supplementary grid line structure. The part of the third main grid line, the fourth main grid line, and the multiple fine grid lines in the third region is the basic grid line structure.

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