Solar cell and photovoltaic module

Abstract

The utility model discloses a solar cell and a photovoltaic assembly, and relates to the field of photovoltaic technology. The size proportion of the interconnection parts arranged at the corresponding electrodes is increased. The solar cell includes a cell substrate, a collector electrode, and an interconnect. The conductivity types of the current collection electrodes located on the same plane are the same, and the multiple current collection electrodes located on the same plane extend in the first direction and are distributed at intervals in the second direction. Each collector electrode comprises a plurality of collector electrode sections distributed in the first direction. At least part of the collector electrode segments are provided with interconnects. In the second direction, the width of each interconnection part is D1. In all the current collection electrodes on the same plane, two adjacent current collection electrode sections in the second direction are each provided with at least one interconnection part, the minimum distance between the two adjacent current collection electrode sections and the two adjacent interconnection parts corresponding to the two adjacent current collection electrode sections in the second direction is D2, and the ratio of D1 to D2 is larger than or equal to 5: 1 and smaller than or equal to 20: 1.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a solar cell and a photovoltaic component. Background Art

[0002] At present, solar cells are increasingly used as a new energy alternative. Among them, photovoltaic solar cells are devices that convert sunlight into electrical energy. Specifically, solar cells use the photovoltaic principle to generate carriers, and then use electrodes to lead the carriers out, thereby facilitating the effective use of electrical energy.

[0003] However, in existing solar cells, the size ratio of the interconnection part arranged at the corresponding electrode is relatively small, so that the contact area between the interconnection parts in the string formed by interconnecting the existing solar cells to form a photovoltaic module and the interconnection part is relatively small, which is not conducive to improving the structural strength and electrical performance of the above-mentioned photovoltaic module. Utility Model Content

[0004] The purpose of the utility model is to provide a solar cell and a photovoltaic module, which are used to increase the size ratio of the interconnection part arranged at the corresponding electrode, thereby increasing the contact area between the interconnection part and the interconnection parts in the string that interconnect the existing solar cells to form a photovoltaic module, which is beneficial to improve the structural strength and electrical performance of the above-mentioned photovoltaic module.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the utility model provides a solar cell, which comprises: a cell substrate, and a collector electrode and an interconnection portion arranged on the light-facing surface and / or the backlight surface of the cell substrate. The collector electrodes on the same surface have the same conductivity type, and the multiple collector electrodes on the same surface extend along the first direction and are spaced apart along the second direction. The first direction is different from the second direction. Each collector electrode comprises a plurality of collector electrode segments distributed along the first direction. At least part of the collector electrode segments are provided with an interconnection portion. Along the second direction, the width of each interconnection portion is D1. Among all the collector electrodes on the same surface, there are two collector electrode segments adjacent to each other along the second direction, each of which is provided with at least one interconnection portion, and the minimum spacing between two adjacent interconnections corresponding to the two collector electrode segments adjacent to each other along the second direction is D2, and the ratio of D1 to D2 is greater than or equal to 5:1 and less than or equal to 20:1.

[0006] In the case of adopting the above technical solution, in the solar cell provided by the utility model, at least part of the collector electrode segments are provided with interconnections. At this time, the collector electrode provided with the interconnection can be electrically connected to the interconnection member in the string for interconnecting different solar cells through the interconnection member, and there is no need to set a long bus electrode to collect the current corresponding to all collector electrodes of the same conductive type, and then transmit it to the interconnection member in the string through the interconnection member provided by the bus electrode, which is conducive to simplifying the pattern complexity of the electrode structure on at least one of the light-facing surface and the backlight surface of the battery substrate provided with the above-mentioned collector electrode and the interconnection member, and then facilitates the formation of the conductive window pattern by using high-precision patterning processes such as laser etching, and then facilitates improving the manufacturing accuracy of the above-mentioned collector electrode and the interconnection member provided on the light-facing surface and / or the backlight surface. At the same time, along the second direction, the width of the interconnection member is D1, and the minimum spacing between two adjacent interconnections corresponding to two collector electrode segments adjacent to each other along the second direction is D2, and the ratio of D1 to D2 is greater than or equal to 5:1 and less than or equal to 20:1. Based on this, compared with the existing solar cell in which the ratio of D1 to D2 is less than 90%, the solar cell provided by the utility model has a larger ratio of D1 to D2, that is, the width of the interconnection along the second direction is larger, which is conducive to increasing the surface area of ​​the interconnection away from the battery substrate, thereby increasing the contact area between the interconnection and the interconnection in the string, and then facilitating the connection strength between the interconnection in the string and the interconnection, and reducing the contact resistance between the two, which is conducive to improving the structural strength and electrical performance of the above-mentioned photovoltaic module. At the same time, there is no need to apply more conductive materials (such as conductive glue) at the location of the interconnection in order to increase the contact area corresponding to the interconnection in the string, as in the existing solar cell manufacturing method, which leads to the problem of high manufacturing cost and process range of the solar cell, which is conducive to improving the manufacturing efficiency and production capacity of the solar cell. Secondly, as mentioned above, the collector electrode and the interconnection in the solar cell provided by the utility model can be manufactured and formed by a process with higher manufacturing precision, so it is conducive to manufacturing a collector electrode with a smaller width, reducing the metal composite loss between the collector electrode and the battery substrate, and can also reduce the shading area of ​​the collector electrode, which is conducive to improving the photoelectric conversion efficiency of the solar cell.

[0007] In a possible implementation, D2 is greater than or equal to 0.1 mm.

[0008] When the above technical solution is adopted, in the actual manufacturing process, it is necessary to set a mask layer on the area where the non-electrode structure is located in the light-facing surface and / or the backlight surface. Then, under the masking effect of the mask layer, a process such as laser etching is used to remove the portion of the passivation layer exposed outside the mask layer to form a conductive window. Based on this, it can be understood that a mask layer needs to be provided on the portion between two adjacent interconnecting parts corresponding to two collector electrode segments adjacent to each other in the second direction, and the smaller the minimum spacing D2 between two adjacent interconnecting parts corresponding to two collector electrode segments adjacent to each other in the second direction, the smaller the width of the mask layer at the portion of the minimum spacing. In the above case, D2 is greater than or equal to 0.1mm, which can prevent the difficulty in quickly and completely removing the portion of the mask layer at the minimum spacing after the electrode structure is formed due to the smaller minimum spacing D2, which makes the width of the portion of the mask layer at the minimum spacing also smaller. This ensures that after the electrode structure is formed, there is no mask layer residue at the minimum spacing between two adjacent interconnections corresponding to two collector electrode segments adjacent to each other along the second direction, which helps to reduce the difficulty of removing the mask layer and improve the efficiency of removing the mask layer.

[0009] In a possible implementation, D2 is greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0010] In the case of adopting the above technical solution, it can be understood that, when other factors are the same, the smaller the minimum spacing D2 between the two adjacent interconnects corresponding to the two collector electrode segments adjacent along the second direction, the larger the width of the two adjacent interconnects corresponding to the two collector electrode segments adjacent along the second direction, and the larger the contact area between the interconnect and the battery substrate. The larger D2 is, the smaller the width of the two adjacent interconnects corresponding to the two collector electrode segments adjacent along the second direction, and the smaller the contact area between the interconnect and the interconnect in the string. In the above case, D2 is within the above range, which can prevent the metal composite area between the interconnect and the battery substrate from being larger due to the smaller D2, and is conducive to reducing the metal composite rate on the side of the battery substrate where the above interconnect is formed. In addition, it can also prevent the contact area between the interconnect and the interconnect in the string from increasing to a smaller extent due to the larger D2, ensuring that the interconnect in the string has a higher connection strength and a lower contact resistance.

[0011] In a possible implementation, along the second direction, the minimum spacing between two adjacent collector electrodes is D3, and the width of the interconnection is greater than or equal to 100 μm and less than or equal to 0.96D3. In this case, the width of the interconnection can be prevented from being too large or too small. The beneficial effect of preventing the width of the interconnection from being too large or too small can refer to the beneficial effect analysis of D2 being greater than or equal to 0.5 mm and less than or equal to 2 mm in the previous text, which will not be repeated here.

[0012] In a possible implementation manner, along the first direction, a length of the interconnection portion is greater than or equal to 0.2 mm and less than or equal to 3 mm.

[0013] When the above technical solution is adopted, along the first direction, the length of the interconnection part is within the above range. When other factors are the same, it can be prevented that the surface area of ​​the interconnection part away from the battery substrate increases less due to the shorter length of the interconnection part, thereby ensuring that the interconnection part and the interconnection parts in the string have a higher connection strength and lower contact resistance. In addition, it can also be prevented that the surface area of ​​the interconnection part away from the battery substrate is too large due to the longer length of the interconnection part, thereby preventing the metal composite loss corresponding to the interconnection part from being higher and the amount of consumables used by the interconnection part from being larger, thereby ensuring that the solar cell has higher working performance and lower manufacturing cost.

[0014] In a possible implementation, a height of the interconnection portion is greater than or equal to 0.5 μm and less than or equal to 30 μm.

[0015] In the case of adopting the above technical solution, the height of the interconnection part is within the above range, which can prevent the interconnection parts in the string from being difficult to electrically connect with the interconnection parts with smaller height when interconnecting different solar cells due to the smaller height of the interconnection part, thereby reducing the difficulty of interconnection. In addition, it can also prevent the use of large amounts of consumables corresponding to the interconnection part due to the larger height of the interconnection part, which is conducive to reducing the manufacturing cost of solar cells. Secondly, the height range of the interconnection part is roughly the same as the required setting height range for the collector electrode in the actual application scenario. Based on this, the interconnection part and the collector electrode can be formed simultaneously in the actual manufacturing process, thereby improving the manufacturing efficiency of solar cells and simplifying the manufacturing process of solar cells.

[0016] In a possible implementation, the height of the interconnection portion is equal to the height of the collector electrode.

[0017] In the case of adopting the above technical solution, when the height of the interconnection part and the collector electrode is the same, the interconnection part and the collector electrode can be formed simultaneously in the actual manufacturing process, thereby improving the manufacturing efficiency of the solar cell and simplifying the manufacturing process of the solar cell. In addition, if in the actual manufacturing process, the setting position of the interconnection part in the string is slightly offset on at least one side where the collector electrode and the interconnection part are formed, the corresponding part of the collector electrode with the same height as the interconnection part can also be electrically connected to the interconnection part in the string, ensuring that the photocurrent collected by the collector electrode can be derived through the interconnection part in the string.

[0018] In a possible implementation, the surface roughness of the interconnection portion on a side facing away from the battery substrate is less than 3 μm within a range of 100 square microns.

[0019] In the case of adopting the above technical solution, in the actual application process, the interconnection surface of the interconnection parts in the string is relatively flat. Based on this, the surface roughness within every 100 square microns on the side of the interconnection part away from the battery substrate is within the above range, so that the surface of the interconnection part away from the battery substrate is relatively flat, which is conducive to increasing the actual effective contact area between the interconnection part and the interconnection parts in the string, and preventing the connection strength and contact performance between the interconnection parts and the interconnection parts in the string from being poor due to the large surface roughness of the interconnection part away from the battery substrate, which makes the side away from the battery substrate uneven. In addition, the surface roughness range of the interconnection part away from the battery substrate is roughly the same as the surface roughness range of the collector electrode away from the battery substrate in the actual application scenario. Based on this, the interconnection part and the collector electrode can be formed simultaneously in the actual manufacturing process, improving the manufacturing efficiency of solar cells and simplifying the manufacturing process of solar cells.

[0020] In a possible implementation, the surface roughness of the interconnection away from the battery substrate is equal to the surface roughness of the collector electrode away from the battery substrate. The beneficial effect in this case is similar to the beneficial effect of the height of the interconnection being equal to the height of the collector electrode as described above, and will not be repeated here.

[0021] In a possible implementation, the interconnection portion and the collector electrode are an integrated structure.

[0022] When the above technical solution is adopted, the interconnection part and the collector electrode can be formed simultaneously in the actual manufacturing process, thereby improving the manufacturing efficiency of the solar cell and simplifying the manufacturing process of the solar cell. At the same time, the collector electrode and the interconnection part are an integrated structure, which can also prevent the presence of pores at the connection between the collector electrode and the interconnection part, ensuring good electrical connection performance between the two.

[0023] In a possible implementation manner, two adjacent collector electrode segments included in the same collector electrode are spaced apart and distributed along the first direction.

[0024] In the case of adopting the above technical solution, it can be understood that the length of each collector electrode segment along the first direction is less than the total length of the collector electrode along the first direction. Secondly, the material of the collector electrode is different from the material of the battery substrate. When the collector electrode is formed on the backlight side of the battery substrate, the battery substrate and the collector electrode of different materials are deformed to different degrees due to the temperature, which leads to the generation of thermal stress. In this case, after each collector electrode is divided into a plurality of collector electrode segments spaced along the first direction and having a length less than the total length of the collector electrode, the thermal stress corresponding to each collector electrode segment is small, which can reduce the risk of bending of the solar cell and improve the yield of the solar cell.

[0025] In a possible implementation manner, the number of collector electrode segments included in at least one collector electrode is greater than or equal to 2 and less than or equal to 5.

[0026] In the case of adopting the above technical solution, it can be understood that when other factors are the same, the number of collector electrode segments included in the collector electrode is large, and the total length of the discontinuity between two adjacent collector electrode segments corresponding to each collector electrode is large. The transmission resistance of carriers transmitted from the discontinuity to the adjacent collector electrode is larger than the transmission resistance of carriers located below the collector electrode segment to the collector electrode, which affects the carrier collection ability of the collector electrode. Based on this, the number of collector electrode segments included in the collector electrode is within the above range, which can prevent the poor carrier collection ability of the collector electrode due to the large number of collector electrode segments included in the collector electrode, and is conducive to reducing the carrier recombination efficiency of the light-facing surface and / or the backlight surface provided with the above-mentioned collector electrode and interconnection.

[0027] In a possible implementation manner, along the first direction, a length of at least one collecting electrode segment is greater than or equal to 30 mm and less than or equal to 60 mm.

[0028] In the case of adopting the above technical solution, when other factors are the same, the length of the collector electrode segment is within the above range, which can prevent the collector electrode from including a large number of collector electrode segments due to the small length of the collector electrode segment, and the beneficial effect of preventing the collector electrode from including a large number of collector electrode segments can be referred to in the above text. In addition, it can also prevent the collector electrode segment from having a large thermal stress due to the large length of the collector electrode segment, further reduce the risk of the battery substrate bending after the collector electrode and the interconnection portion are formed on the light-facing surface and / or the backlight surface of the battery substrate, and improve the yield of the solar cell.

[0029] In a possible implementation manner, a distance between every two adjacent collecting electrode segments included in the same collecting electrode is greater than or equal to 0.01 mm and less than or equal to 1 mm.

[0030] When the above technical solution is adopted, the spacing between each two adjacent collector electrode segments included in the same collector electrode is within the above range, which can prevent the high precision requirements for manufacturing the collector electrode due to the small spacing, and is conducive to reducing the difficulty of manufacturing solar cells. In addition, it can also prevent the low carrier collection ability of the collector electrode itself due to the large spacing, which is conducive to the carrier recombination efficiency of the light-facing surface and / or the backlight surface where the above collector electrode and interconnection are provided.

[0031] In a possible implementation manner, a distance between every two adjacent collecting electrode segments included in the same collecting electrode is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

[0032] In the case of adopting the above technical solution, as mentioned above, in the actual manufacturing process, it is necessary to set a mask layer on the area where the non-electrode structure is located in the light-facing surface and / or the backlight surface. Then, under the masking action of the mask layer, a process such as laser etching is used to remove the portion of the passivation layer exposed outside the mask layer to form a conductive window. Based on this, it can be understood that a mask layer needs to be provided on the portion between each two adjacent collector electrode segments included in the same collector electrode, so the smaller the spacing between each two adjacent collector electrode segments included in the same collector electrode, the smaller the width of the mask layer at the spacing. In the above case, the spacing between each two adjacent collector electrode segments included in the same collector electrode is within the above range, which is conducive to quickly and completely removing the portion of the mask layer located between each two adjacent collector electrode segments included in the same collector electrode after the electrode structure is formed, which is conducive to improving the yield and manufacturing efficiency of solar cells. In addition, the distance between each two adjacent collector electrode segments included in the same collector electrode is within the above range, which is also conducive to ensuring that the collector electrode has a larger effective electrical collection length and that the collector electrode segments have a higher carrier collection efficiency.

[0033] In a possible implementation, among all interconnections on the same surface, different interconnections in the same row along the second direction are aligned along the second direction. In this case, the distribution of the interconnections is relatively regular, which helps to reduce the difficulty of electrically interconnecting different solar cells.

[0034] In a possible implementation, different collector electrode segments in the same column along the second direction are aligned along the second direction. In this case, the collector electrode segments are distributed more regularly on the backlight surface and / or light-facing surface of the solar cell, which helps to reduce manufacturing difficulty.

[0035] In a possible implementation, along the first direction, the length of the collector electrode segment is L mm, and at least one collector electrode segment corresponds to N interconnections. N is a positive integer greater than or equal to 1, and the ratio between L and N is greater than or equal to 1:1 and less than or equal to 30:1.

[0036] In the case of adopting the above technical solution, the carriers collected by at least one collector electrode segment need to be transmitted to the interconnection member in the string through the corresponding interconnection part, and then exported by the interconnection member in the string. Based on this, it can be understood that, when other factors are the same, the fewer the number of interconnections set on the collector electrode segment, the longer the distance that the carriers collected by at least part of the collector electrode segment need to be transmitted on the corresponding part of the collector electrode segment before they can reach the interconnection part, resulting in a larger transmission resistance of the carriers on the collector electrode segment. In the above case, the ratio between L and N is within the above range, which can prevent the large transmission resistance of the carriers on the collector electrode segment due to the small ratio, which is beneficial to reduce the transmission loss. In addition, it can also prevent the metal composite loss between the interconnection part and the battery substrate from being high due to the large number of interconnections set on the collector electrode segment due to the small ratio, which is beneficial to further improve the working performance of the solar cell.

[0037] In a possible implementation manner, among all interconnections corresponding to the same collector electrode provided with the interconnection, a distance between two adjacent interconnections is greater than or equal to 8 mm and less than or equal to 30 mm.

[0038] In the case of adopting the above technical solution, when other factors are the same, among all interconnections corresponding to the same collector electrode provided with interconnections, the spacing between two adjacent interconnections is within the above range, which can prevent the larger spacing from causing a larger transmission resistance of carriers on the collector electrode, thereby helping to reduce transmission losses. In addition, it can also prevent the metal composite loss between the interconnection and the battery substrate from being higher due to the larger number of interconnections provided on the collector electrode due to the smaller spacing, thereby helping to further improve the working performance of the solar cell.

[0039] In a possible implementation manner, each collector electrode segment is provided with at least one interconnection portion.

[0040] When the above technical solution is adopted, each collector electrode segment is provided with at least one interconnection. In this case, the solar cell can be provided with a bus electrode or a bus electrode segment on at least one side of the cell substrate where the above collector electrode and the interconnection are formed, and the photocurrent can be derived through the interconnection in the string, which is conducive to reducing the amount of consumables used when manufacturing the electrode structure and controlling the manufacturing cost of the solar cell. At the same time, the pattern complexity of the electrode structure on the light side and / or the backlight side can be further reduced, which is conducive to the formation of the conductive window pattern by using high-precision patterning processes such as laser etching, which is conducive to improving the manufacturing accuracy of the above collector electrode and the interconnection, and improving the yield of the solar cell.

[0041] In a possible implementation, the solar cell further includes a bus electrode segment. All bus electrode segments are located only on at least one side edge region along the second direction of one side of the cell substrate on which the collector electrode and the interconnection portion are provided. Each bus electrode segment extends along the second direction, and different bus electrode segments located on the same side and on the same side edge region are spaced apart along the first direction. Each bus electrode segment is in electrical contact with a collector electrode on the same side and on the same edge region as itself. Among all the collector electrodes, the collector electrode in electrical contact with the bus electrode segment is a first type of collector electrode, and the remaining collector electrodes are second type of collector electrodes. Only the collector electrode segments included in the second type of collector electrodes are provided with interconnections.

[0042] In the case of adopting the above technical solution, each bus electrode segment is in electrical contact with the collector electrode on the same surface and the same edge area as itself. At this time, when the solar cell is in working state, the carriers collected by the collector electrode (i.e., the first type of collector electrode) on the edge area of ​​at least one side of the light-facing surface and / or the backlight surface along the second direction can be converged to the bus electrode segment. At the same time, only the collector electrode segment included in the second type of collector electrode is provided with an interconnection portion. Based on this, after the solar cell string provided by the utility model is electrically interconnected by the intra-string interconnection member, the intra-string interconnection member only needs to be electrically connected to the bus electrode segment to collect the carriers collected by the collector electrode on the edge area on one side of the light-facing surface and / or the backlight surface along the second direction. The end of the intra-string interconnection member does not need to extend to the edge areas on both sides of the battery substrate along the second direction at the same time, thereby shortening the effective connection length between the intra-string interconnection member and the battery substrate, which is conducive to reducing the stress of the edge area of ​​the battery substrate along the second direction, thereby reducing the risk of interconnection failure. At the same time, it is also conducive to preventing the ends of the intra-string interconnection member connected to two adjacent solar cells in the solar cell string included in the photovoltaic module from overlapping and causing a short circuit. Secondly, all bus electrode segments are only located on the edge areas on both sides of the light-facing surface and / or the backlight surface along the second direction. In other words, the length of the bus electrode segment included in the solar cell provided by the utility model is less than the length of the bus electrode included in the conventional main-grid solar cell. Based on this, compared with the conventional main-grid solar cell, the collector electrode and the bus electrode segment in the solar cell provided by the utility model have a smaller composite area with the cell substrate, which is conducive to making the solar cell have a larger open-circuit voltage, and can also reduce the material consumption of manufacturing the bus electrode segment, which is conducive to controlling the manufacturing cost of the solar cell. In addition, the interconnection member in the string can be electrically coupled with the second type of collector electrode without passing through the bus electrode. At this time, the transmission path of the carriers collected by the second type of collector electrode to the interconnection member in the string is shorter, which is conducive to reducing transmission losses and improving the working efficiency of the solar cell string formed based on the solar cell provided by the utility model.

[0043] In a possible implementation, the bus electrode segment and the collector electrode are an integrated structure; and / or the bus electrode segment and the interconnection are an integrated structure. The beneficial effects in this case can be referred to the beneficial effects analysis of the collector electrode and the interconnection being an integrated structure as described above, and will not be repeated here.

[0044] In a possible implementation, the solar cell is a solar cell with double-sided light reception, with collector electrodes and interconnections disposed on both the light-facing side and the backlight side.

[0045] When the above technical solution is adopted, a solar cell that can generate electricity when receiving light on both the light-facing side and the backlight side is a double-sided solar cell. In this case, as mentioned above, the collector electrode and the interconnection part in the solar cell provided by the utility model can be manufactured by a process with a higher manufacturing precision, so it is beneficial to manufacture a collector electrode with a smaller width and reduce the light-shielding area of ​​the collector electrode. Based on this, when the solar cell is a double-sided solar cell, the above-mentioned collector electrode and interconnection part are provided on both the light-facing side and the backlight side, which is beneficial to simultaneously reduce the reflectivity of the light-facing side and the backlight side, and further improve the photoelectric conversion efficiency of the solar cell.

[0046] In a second aspect, the utility model provides a photovoltaic assembly, which includes the solar cell provided by the first aspect and various implementations thereof, and an intra-string interconnector for connecting two adjacent solar cells in series. Each intra-string interconnector is at least electrically connected to an interconnection portion included in a corresponding solar cell.

[0047] The beneficial effects of the second aspect of the present invention can be analyzed by referring to the beneficial effects of the first aspect and its various implementation methods, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0049] Figure 1 A schematic diagram of the distribution of the collector electrode and the interconnection portion of the solar cell provided by the embodiment of the utility model Figure 1 ;

[0050] Figure 2 An enlarged schematic diagram of the structure of two interconnection portions adjacent to each other along the second direction in a solar cell provided by an embodiment of the utility model;

[0051] Figure 3 A schematic diagram of the distribution of the collector electrode and the interconnection portion of the solar cell provided by the embodiment of the utility model Figure 2 ;

[0052] Figure 4 A schematic diagram of the structure of the solar cell at the interconnection portion provided by the embodiment of the utility model Figure 1 ;

[0053] Figure 5 A schematic diagram of the structure of the solar cell at the interconnection portion provided by the embodiment of the utility model Figure 2 ;

[0054] Figure 6 A schematic diagram of the distribution of the collector electrode and the interconnection portion of the solar cell provided by the embodiment of the utility model Figure 3 ;

[0055] Figure 7 A schematic diagram of the distribution of the collector electrode and the interconnection portion of the solar cell provided by the embodiment of the utility model Figure 4 ;

[0056] Figure 8 A schematic diagram of the distribution of the collector electrode and the interconnection portion of the solar cell provided by the embodiment of the utility model Figure 5 ;

[0057] Fig. 9 A schematic diagram of the distribution of the collector electrode and the interconnection portion of the solar cell provided by the embodiment of the utility model Figure 6 .

[0058] Reference numerals: 11 is a battery substrate, 12 is a collecting electrode, 13 is an interconnection portion, 14 is a collecting electrode segment, 15 is a bus electrode segment, and 16 is an intra-string interconnection member. DETAILED DESCRIPTION

[0059] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0060] 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.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0062] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0063] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0064] At present, solar cells are increasingly used as a new energy alternative. Among them, photovoltaic solar cells are devices that convert sunlight into electrical energy. Specifically, solar cells use the photovoltaic principle to generate carriers, and then use electrodes to lead the carriers out, thereby facilitating the effective use of electrical energy.

[0065] When the positive electrode and negative electrode of the solar cell are both on the back of the cell, the front of the cell is not blocked by the metal electrode, which is conducive to more light being transmitted from the front of the cell to the cell base of the solar cell and being used by the cell base. Based on this, compared with solar cells with blocked fronts, solar cells with positive and negative electrodes on the back have higher short-circuit current and photoelectric conversion efficiency, and are one of the current technical directions for achieving high-efficiency crystalline silicon cells.

[0066] Specifically, existing solar cells generally include a cell substrate, a first electrode, a second electrode, and an interconnection. A first doping region is formed on the light-facing side of the cell substrate, and a second doping region is formed on the backlight side of the cell substrate, and the second doping region and the first doping region have opposite conductivity types. The first electrode is arranged on the light-facing side of the cell substrate and is in ohmic contact with the first doping region to guide out the carriers collected by the first doping region. The second electrode is arranged on the backlight side of the cell substrate and is in ohmic contact with the second doping region to guide out the carriers collected by the second doping region. The conductivity types of the first electrode and the second electrode are opposite. In addition, the first electrode and the second electrode are both provided with an interconnection, so that when different solar cells are interconnected to form a photovoltaic module, the interconnection is electrically connected to the corresponding in-string interconnection member through the interconnection to realize the transmission of carriers.

[0067] However, in the existing solar cells, the first electrode, the second electrode and the interconnection are usually formed by screen printing process. Due to the limitation of the manufacturing precision of the screen printing equipment, the size ratio of the interconnection arranged at the corresponding electrode is relatively small (the ratio between the width D1 of the interconnection and the minimum spacing D2 between two adjacent interconnections arranged on two adjacent rows of electrodes is less than 90%). However, the size ratio of the interconnection is relatively small, which will lead to a relatively small surface area on the side away from the battery substrate, so that the contact area between the interconnection parts in the string formed by interconnecting the existing solar cells to form a photovoltaic module and the interconnection parts is relatively small, which in turn leads to a relatively large connection strength and contact resistance between the interconnection parts in the string and the interconnection parts, which is not conducive to improving the structural strength and electrical performance of the photovoltaic module. In view of the above technical problems, although the above contact area can be increased by additionally coating more conductive materials (such as conductive glue) at the location of the interconnection parts, such operation will increase the manufacturing cost of the solar cell, and at the same time, only setting the conductive materials at the location of the interconnection parts will make the process of the solar cell more complicated.

[0068] In order to solve the above technical problems, in the first aspect, the embodiment of the utility model provides a solar cell. Figure 1 and Figure 2As shown, the solar cell provided by the embodiment of the utility model includes: a cell substrate 11, and a collector electrode 12 and an interconnection 13 arranged on the light-facing surface and / or the backlight surface of the cell substrate 11. The collector electrodes 12 located on the same surface have the same conductivity type, and the multiple collector electrodes 12 located on the same surface extend along the first direction and are spaced apart along the second direction. The first direction is different from the second direction. Each collector electrode 12 includes a plurality of collector electrode segments 14 distributed along the first direction. At least part of the collector electrode segments 14 is provided with an interconnection 13. Along the second direction, the width of each interconnection 13 is D1. Among all the collector electrodes 12 located on the same surface, there are two collector electrode segments 14 adjacent to each other along the second direction, each of which is provided with at least one interconnection 13, and the minimum spacing between two adjacent interconnections 13 corresponding to the two collector electrode segments 14 adjacent to each other along the second direction is D2, and the ratio of D1 to D2 is greater than or equal to 5:1 and less than or equal to 20:1.

[0069] The distance specifically represented by the minimum spacing D2 between two adjacent interconnecting parts corresponding to two collector electrode segments adjacent to each other along the second direction can be determined according to the morphology of the interconnecting parts in the actual application scenario and the location of the interconnecting parts on the collector electrode segments. Figure 2 As shown, when the cross section of the interconnection 13 is a rectangle and the extending direction of the collector electrode segment 14 is parallel to the long side or short side of the rectangle, the above D2 is the spacing between any part of the two adjacent interconnections 13 corresponding to the two collector electrode segments 14 adjacent to each other in the second direction. For another example: when the cross section of the interconnection is a rhombus and the extending direction of the collector electrode segment is parallel to any diagonal line of the rhombus, the above D2 is the spacing between the parts of the two adjacent interconnections corresponding to the two collector electrode segments adjacent to each other in the second direction with the largest width.

[0070] Secondly, the ratio of D1 to D2 can be any value greater than or equal to 5:1 and less than or equal to 20:1. For example, the ratio of D1 to D2 can be 5:1, 7:1, 10:1, 12:1, 15:1, 18:1 or 20:1. As for the width D1 of the interconnection portion and the specific size of the minimum spacing D2 between two adjacent interconnections corresponding to two collector electrode segments adjacent to each other along the second direction, they can be determined according to the size of the battery substrate in the actual application scenario and the actual application scenario, and are not specifically limited here.

[0071] When the above technical solution is adopted, Figure 1 and Figure 2As shown, in the solar cell provided by the embodiment of the utility model, at least part of the collector electrode segments 14 are provided with interconnection parts 13. At this time, the collector electrode 12 provided with the interconnection parts 13 can be electrically connected to the in-string interconnection parts 16 for interconnecting different solar cells through the interconnection parts 13, and there is no need to provide a long bus electrode to collect the current corresponding to all the collector electrodes 12 of the same conductive type, and then transmit it to the in-string interconnection parts 16 through the interconnection parts 13 provided on the bus electrode, which is conducive to simplifying the pattern complexity of the electrode structure on at least one of the light-facing surface and the backlight surface of the cell substrate 11 provided with the above-mentioned collector electrode 12 and the interconnection parts 13, and further facilitate the formation of the conductive window pattern by using high-precision patterning processes such as laser etching, and further facilitate improving the manufacturing accuracy of the above-mentioned collector electrode 12 and the interconnection parts 13 provided on the light-facing surface and / or the backlight surface. At the same time, along the second direction, the width of the interconnection 13 is D1, and the minimum spacing between two adjacent interconnections 13 corresponding to two collector electrode segments 14 adjacent to each other along the second direction is D2, and the ratio of D1 to D2 is greater than or equal to 5:1 and less than or equal to 20:1. Based on this, compared with the existing solar cell in which the ratio of D1 to D2 is less than 90%, the solar cell provided by the embodiment of the utility model has a larger ratio of D1 to D2, that is, the width of the interconnection 13 along the second direction is larger, which is conducive to increasing the surface area of ​​the interconnection 13 away from the battery substrate 11, thereby increasing the contact area between the interconnection 13 and the interconnection member 16 in the string, and further facilitating the improvement of the connection strength between the interconnection member 16 in the string and the interconnection 13, and reducing the contact resistance between the two, which is conducive to improving the structural strength and electrical performance of the above-mentioned photovoltaic module. At the same time, there is no need to apply more conductive materials (such as conductive glue) at the location of the interconnection part 13 in order to increase the contact area corresponding to the interconnection part 16 in the string as in the existing solar cell manufacturing method, which leads to higher manufacturing costs and process range problems for solar cells, which is conducive to improving the manufacturing efficiency and production capacity of solar cells. Secondly, as mentioned above, the collector electrode 12 and the interconnection part 13 in the solar cell provided by the embodiment of the utility model can be manufactured by a process with higher manufacturing precision, so it is conducive to manufacturing a collector electrode 12 with a smaller width, reducing the metal composite loss between the collector electrode 12 and the battery substrate 11, and can also reduce the shading area of ​​the collector electrode 12, which is conducive to improving the photoelectric conversion efficiency of the solar cell.

[0072] In actual application, the embodiments of the present invention do not specifically limit the specific structure and material of the battery substrate, as long as the conductivity types of the electrode structures formed on the light-facing surface and the backlight surface of the battery substrate are opposite.

[0073] Exemplarily, the battery substrate may include a semiconductor substrate, a first doped region disposed on the light-facing side of the semiconductor substrate, and a second doped region disposed on the backlight side of the semiconductor substrate. The first doped region and the second doped region have opposite conductivity types. The first doped region may be located in the light-facing side of the semiconductor substrate or on the light-facing side. The second doped region may be located in the backlight side of the semiconductor substrate or on the backlight side.

[0074] Specifically, the semiconductor substrate may be a substrate made of any semiconductor material such as a silicon substrate, a silicon germanium substrate, a germanium substrate or a gallium arsenide substrate. In terms of conductivity type, the semiconductor substrate may be an intrinsic conductive substrate, an N-type conductive substrate or a P-type conductive substrate. Preferably, the semiconductor substrate is an N-type conductive substrate or a P-type conductive substrate. Compared with an intrinsic conductive substrate, an N-type conductive substrate or a P-type conductive substrate has a higher conductivity, which is beneficial to reducing the series resistance of the solar cell and improving the efficiency of the solar cell.

[0075] For the above-mentioned first doping region and the second doping region, in terms of conductivity type, the conductivity type of the first doping region may be N-type, and the conductivity type of the second doping region is P-type. Alternatively, the conductivity type of the first doping region may be P-type, and the conductivity type of the second doping region is N-type.

[0076] In terms of materials, when the first doped region and / or the second doped region is a doped semiconductor layer formed on a semiconductor substrate, the material of the doped semiconductor layer may include at least one semiconductor material such as silicon, silicon germanium, germanium or silicon carbide. In terms of the internal arrangement of the material, the crystal phase of the doped semiconductor layer may be amorphous, microcrystalline, single crystal, nanocrystalline or polycrystalline. Specifically, when the first doped region and the second doped region are both doped semiconductor layers formed on a semiconductor substrate, the material and / or crystal phase of the first doped region and the second doped region may be the same or different.

[0077] In addition, from the aspect of the formation position, when the first doped region and / or the second doped region is a doped semiconductor layer formed on a semiconductor substrate, the doped semiconductor layer can be directly formed on the corresponding surface of the semiconductor substrate (for example: when the first doped region is a doped semiconductor layer formed on a semiconductor substrate, the doped semiconductor layer can be directly formed on the light-facing surface of the semiconductor substrate); or, the above-mentioned battery substrate can also include a passivation layer located between the doped semiconductor layer and the semiconductor substrate. The passivation layer can form a selective contact structure with the doped semiconductor layer to passivate the corresponding surface of the semiconductor substrate while realizing the selective collection of carriers of the corresponding conductive type and reducing the carrier recombination rate on one side of the surface. Among them, the material of the passivation layer can be determined according to the material of the doped semiconductor layer, and is not specifically limited here. For example: when the doped semiconductor layer includes a doped polycrystalline silicon layer, the passivation layer is a tunneling passivation layer. For another example: when the doped semiconductor layer includes a doped amorphous silicon layer, the passivation layer is an intrinsic amorphous silicon layer. Secondly, the embodiment of the utility model does not specifically limit the material of the passivation layer.

[0078] It should be noted that when both the first doped region and the second doped region are doped semiconductor layers formed on a semiconductor substrate, the above passivation layer may be formed between only one of the first doped region and the second doped region and the semiconductor substrate, or the above passivation layer may be formed between each of the first doped region and the second doped region and the semiconductor substrate. When the above passivation layer is formed between each of the first doped region and the second doped region and the semiconductor substrate, the materials of the passivation layers between the first doped region and the second doped region and the semiconductor may be the same or different.

[0079] In addition, in actual application, the above-mentioned collector electrode and interconnection part may be provided only on the light-facing surface of the battery substrate, or only on the backlight surface of the battery substrate, or both on the light-facing and backlight surfaces of the battery substrate. Specifically, whether the above-mentioned collector electrode and interconnection part are provided on the light-facing and backlight surfaces of the battery substrate or both on the light-facing and backlight surfaces can be determined according to the type of solar cell and actual needs.

[0080] Exemplarily, in the case where the solar cell is a single-sided solar cell that receives light, the above-mentioned collector electrode and interconnect may be provided only on the light-facing surface, or the above-mentioned collector electrode and interconnect may be provided on both the light-facing surface and the backlight surface. In this case, the single-sided solar cell that receives light is a cell in which light is absorbed and utilized from one side of the cell (i.e., the light-facing side). In this case, as described above, the collector electrode and interconnect in the solar cell provided in the embodiment of the utility model can be manufactured and formed using a process with greater manufacturing precision, so it is beneficial to manufacture collector electrodes with smaller widths and reduce the light-shielding area of ​​the collector electrode. Based on this, when the solar cell is a single-sided solar cell that receives light, at least the above-mentioned collector electrode and interconnect are provided on the light-facing surface, which is beneficial to reducing the reflectivity of the light-facing side of the solar cell and further improving the photoelectric conversion efficiency of the solar cell.

[0081] Exemplarily, in the case where the solar cell is a solar cell that receives light on both sides, the collector electrode and the interconnection part may be provided on one of the light-facing side and the backlight side, or the collector electrode and the interconnection part may be provided on both the light-facing side and the backlight side. It can be understood that a solar cell that can generate electricity when receiving light on both the light-facing side and the backlight side is a solar cell that receives light on both sides. And, as mentioned above, the collector electrode and the interconnection part in the solar cell provided in the embodiment of the utility model can be manufactured and formed by a process with higher manufacturing precision, so it is conducive to manufacturing a collector electrode with a smaller width and reducing the shading area of ​​the collector electrode. Based on this, when the solar cell is a solar cell that receives light on both sides, the above-mentioned collector electrode and the interconnection part are provided on both the light-facing side and the backlight side, which is conducive to reducing the reflectivity of the light-facing side and the backlight side at the same time, and further improving the photoelectric conversion efficiency of the solar cell.

[0082] As for the above-mentioned collector electrode, from the material aspect, the material of the above-mentioned collector electrode may include at least one conductive material, as long as it can be applied to the solar cell provided in the embodiment of the utility model.

[0083] Exemplarily, the material of the above-mentioned collector electrode may include one or more combinations of gold, silver, copper, aluminum, nickel, chromium, titanium and tin. For example: the material of the collector electrode may include only one of gold, silver, copper, aluminum, nickel, chromium, titanium and tin. For another example: the material of the collector electrode may include a combination of any two of gold, silver, copper, aluminum, nickel, chromium, titanium and tin (such as aluminum-nickel alloy or aluminum-tin alloy, etc.). For another example: the material of the collector electrode may include a combination of any three of gold, silver, copper, aluminum, nickel, chromium, titanium and tin. In the above case, the material of the collector electrode has a variety of optional types. And the manufacturing process of the collector electrode corresponding to different material types may be different (such as when the material of the collector electrode includes copper, the collector electrode can be manufactured by at least an electroplating process, and when the material of the collector electrode includes aluminum or tin, the collector electrode can be manufactured by at least a physical vapor deposition process). Therefore, when the material of the collector electrode includes the above types, a variety of manufacturing processes can be used to form the collector electrode, which is conducive to improving the applicability of the solar cell provided by the embodiment of the utility model in different application scenarios.

[0084] In terms of morphology, the embodiment of the utility model does not specifically limit the morphology of each collector electrode segment included in the collector electrode, and can be set according to actual needs. For example, the cross section of each collector electrode segment included in the collector electrode can be rectangular, diamond, elliptical or wavy.

[0085] Secondly, in the solar cell provided by the embodiment of the utility model, the collector electrode can be a continuous collector electrode. In this case, in the same collector electrode, at least one end of the collector electrode segment along the first direction is connected to the end of the preceding and / or following collector electrode segment.

[0086] Or, if Figure 1 As shown, two adjacent collector electrode segments 14 included in the same collector electrode 12 may also be spaced apart and distributed along the first direction. In this case, the collector electrode 12 is a discontinuous collector electrode.

[0087] When the above technical solution is adopted, it can be understood that if Figure 1 As shown, the length of each collector electrode segment 14 along the first direction is less than the total length of the collector electrode 12 along the first direction. Secondly, the material of the collector electrode 12 is different from that of the battery substrate 11. When the collector electrode 12 is formed on the light-facing surface and / or the backlight surface of the battery substrate 11, the battery substrate 11 and the collector electrode 12 made of different materials are deformed to different degrees due to the temperature, thereby causing thermal stress. In this case, after each collector electrode 12 is divided into a plurality of collector electrode segments 14 spaced apart along the first direction and having a length less than the total length of the collector electrode 12, the thermal stress corresponding to each collector electrode segment 14 is small, which can reduce the risk of bending of the solar cell and improve the yield of the solar cell.

[0088] In terms of quantity and size, the number of collector electrodes arranged on the light-facing side and / or the backlight side of the battery substrate in the embodiment of the utility model will affect the carrier collection efficiency, shading area and metal composite loss on the side of the battery substrate where the collector electrode is arranged. Therefore, it can be determined according to the width of the light-facing side and / or the backlight side of the battery substrate along the second direction in the actual application scenario, as well as the shading area and metal composite loss of the electrode structure, etc., and no specific limitation is made here. Secondly, as mentioned above, after each collector electrode is divided into a plurality of collector electrode segments whose length is less than the total length of the collector electrode and which are spaced apart along the first direction, the thermal stress corresponding to each collector electrode segment is small, so as to reduce the risk of bending of the solar cell. In addition, each collector electrode needs to export the carriers collected by the corresponding doping region, so each collector electrode needs to have a certain carrier collection capacity. However, the carrier collection capacity of each collector electrode at the discontinuity between two adjacent collector electrode segments is relatively poor. Based on this, the number and quantity of collector electrode segments included in each collector electrode can be determined according to the length of the light-facing surface and / or backlight surface of the battery substrate along the first direction, and the requirements for thermal stress and carrier collection capacity of the collector electrode in actual application scenarios, and no specific limitation is made here.

[0089] Exemplarily, the number of collector electrode segments included in the at least one collector electrode may be greater than or equal to 2 and less than or equal to 5. For example, the number of collector electrode segments included in at least one collector electrode may be 2, 3, 4 or 5. In this case, it can be understood that when other factors are the same, the number of collector electrode segments included in the collector electrode is relatively large, and the total length of the discontinuity between two adjacent collector electrode segments corresponding to each collector electrode is relatively large. The transmission resistance of carriers from the discontinuity to the adjacent collector electrode is greater than the transmission resistance of carriers located below the collector electrode segment to the collector electrode, which affects the carrier collection ability of the collector electrode. Based on this, the number of collector electrode segments included in the collector electrode is within the above range, which can prevent the poor carrier collection ability of the collector electrode due to the large number of collector electrode segments included in the collector electrode, and is beneficial to reduce the carrier recombination efficiency on the light side and / or the backlight side.

[0090] Exemplarily, along the first direction, the length of at least one collector electrode segment may be greater than or equal to 30 mm and less than or equal to 120 mm. For example, the length of at least one collector electrode segment may be 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 80 mm, 100 mm, 105 mm or 120 mm, etc. In this case, when other factors are the same, the length of the collector electrode segment is within the above range, which can prevent the collector electrode from including a large number of collector electrode segments due to the small length of the collector electrode segment, and the beneficial effect of preventing the collector electrode from including a large number of collector electrode segments can refer to the above text. In addition, it can also prevent the collector electrode segment from having a large thermal stress due to the large length of the collector electrode segment, further reduce the risk of bending of the battery substrate after the collector electrode and the interconnection portion are formed on the light-facing surface and / or the backlight surface of the battery substrate, and improve the yield of the solar cell.

[0091] Exemplarily, the spacing between each two adjacent collector electrode segments included in the same collector electrode may be greater than or equal to 0.01 mm and less than or equal to 1 mm. For example, the spacing between each two adjacent collector electrode segments included in the same collector electrode may be 0.01 mm, 0.06 mm, 0.12 mm, 0.18 mm, 0.24 mm, 0.4 mm, 0.8 mm or 1 mm, etc. In the above case, the spacing between each two adjacent collector electrode segments included in the same collector electrode is within the above range, which can prevent the high precision requirements for manufacturing the collector electrode due to the small spacing, and is conducive to reducing the difficulty of manufacturing solar cells. In addition, it can also prevent the collector electrode itself from having a low carrier collection ability due to the large spacing, which is beneficial to the carrier recombination efficiency of the light-facing surface and / or the backlight surface where the collector electrode and the interconnection are provided.

[0092] Preferably, the spacing between each two adjacent collector electrode segments included in the same collector electrode may be greater than or equal to 0.2 mm and less than or equal to 0.5 mm. For example, the spacing between each two adjacent collector electrode segments included in the same collector electrode may be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.5 mm. In this case, as mentioned above, in the actual manufacturing process, it is necessary to set a mask layer on the area where the non-electrode structure is located in the light-facing surface and / or the backlight surface. Then, under the masking action of the mask layer, laser etching and other processes are used to remove the portion of the passivation layer exposed outside the mask layer to form a conductive window. Based on this, it can be understood that a mask layer needs to be provided on the portion between each two adjacent collector electrode segments included in the same collector electrode. Therefore, the smaller the spacing between each two adjacent collector electrode segments included in the same collector electrode, the smaller the width of the mask layer at the spacing. In the above case, the spacing between each two adjacent collector electrode segments included in the same collector electrode is within the above range, which is conducive to quickly and completely removing the portion of the mask layer located between each two adjacent collector electrode segments included in the same collector electrode after the electrode structure is formed, which is conducive to improving the yield and manufacturing efficiency of the solar cell. In addition, the spacing between each two adjacent collector electrode segments included in the same collector electrode is within the above range, which is also conducive to ensuring that the collector electrode has a larger effective electrical collection length and ensuring that the collector electrode segment has a higher carrier collection efficiency.

[0093] It should be noted that if Figure 1 and Figure 3 As shown, the lengths of different collector electrode segments 14 included in the same collector electrode 12 may be equal or unequal. Figure 1 As shown, along the second direction, the collector electrode 12 located in the first row includes three collector electrode segments 14 spaced apart along the first direction, and the lengths of the three collector electrode segments 14 are all equal. Figure 3 As shown, along the second direction, the collector electrode 12 located in the first row includes three collector electrode segments 14 spaced apart along the first direction; the lengths of the three collector electrode segments 14 are unequal to each other.

[0094] Secondly, if Figure 1 and Figure 4 As shown, when the same collecting electrode 12 includes at least three collecting electrode segments 14 , the spacings corresponding to different pairs of collecting electrode segments 14 in the same collecting electrode 12 may be equal or unequal; each pair of collecting electrode segments 14 is two adjacent collecting electrode segments 14 included in the same collecting electrode 12 .

[0095] In addition, the number of collector electrode segments included in different collector electrodes of the same conductivity type may be the same or different. Furthermore, the lengths of the collector electrode segments included in different collector electrodes of the same conductivity type may be equal or unequal. The spacings between two pairs of collector electrode segments included in different collector electrodes of the same conductivity type may be equal or unequal. Figure 1 and Figure 4 As shown, when the number and length of the collector electrode segments 14 included in different collector electrodes 12 of the same conductive type and the spacing between two pairs of collector electrode segments 14 are the same, it is beneficial to align the different collector electrode segments 14 in the same column along the second direction along the second direction. In this case, the distribution of the collector electrode segments 14 on the backlight surface and / or the light-facing surface of the solar cell is relatively regular, which is beneficial to reduce the manufacturing difficulty.

[0096] It can be seen from the above content that in the solar cell provided by the embodiment of the utility model, the length and number of the collecting electrode segments included in the collecting electrode arranged on the same surface of the battery substrate, and the spacing between two adjacent collecting electrode segments along the first direction have multiple setting schemes, and the appropriate scheme can be flexibly selected according to the requirements of different actual application scenarios to improve the applicability of the solar cell provided by the embodiment of the utility model in different application scenarios.

[0097] For the above interconnection part, the embodiment of the utility model does not specifically limit the morphology of the interconnection part, as long as it can be electrically connected to the interconnection parts in the string when different solar cells are interconnected. Figure 4 and Figure 5 As shown, the cross section of at least one interconnection portion 13 may be rectangular, circular, elliptical, trapezoidal or rhombus-shaped. Figure 5 As shown, along the first direction, the width of the middle of at least one interconnection 13 can be greater than the width of its two ends, so as to reduce the amount of consumables used and metal composite loss at both ends of the interconnection 13 along the first direction while being electrically connected to the interconnection member 16 in the string through the interconnection 13. Specifically, the width of the interconnection 13 can be gradually reduced from the middle to the two ends of the interconnection 13 along the first direction. Specifically, it can be gradually reduced in a linear, parabolic or exponential manner.

[0098] From the material aspect, the material of the above-mentioned interconnection part may include at least one conductive material as long as it can be applied to the solar cell provided in the embodiment of the utility model.

[0099] Exemplarily, the material of the above-mentioned interconnection includes one or more combinations of gold, silver, copper, aluminum, nickel, chromium, titanium and tin. For example: the material of the interconnection may include only one of gold, silver, copper, aluminum, nickel, chromium, titanium and tin. For another example: the material of the interconnection may include a combination of any two of gold, silver, copper, aluminum, nickel, chromium, titanium and tin (such as aluminum-nickel alloy or aluminum-tin alloy, etc.). For another example: the material of the interconnection may include a combination of any three of gold, silver, copper, aluminum, nickel, chromium, titanium and tin. In the above case, the material of the interconnection has a variety of optional types. And the manufacturing process of the interconnection corresponding to different material types may be different. Therefore, when the material of the interconnection includes the above types, a variety of manufacturing processes can be used to form the interconnection, which is beneficial to improve the applicability of the solar cell provided by the embodiment of the utility model in different application scenarios.

[0100] In terms of size, as mentioned above, when different solar cells are interconnected, they need to be electrically interconnected with the interconnection parts in the string. Therefore, the size of the interconnection part will affect the contact area between the interconnection part and the interconnection parts in the string, and will also affect the spacing between the interconnection part and the adjacent spacing area, thereby affecting the connection strength and contact performance between the interconnection part and the interconnection parts in the string. Based on this, the size of the interconnection part can be set according to the size of the battery substrate in the actual application scenario, the connection strength and contact performance requirements between the interconnection part and the interconnection parts in the string, as long as the ratio of D1 to D2 can be greater than or equal to 5:1 and less than or equal to 20:1.

[0101] Exemplarily, along the second direction, the minimum spacing between two adjacent collector electrodes is D3, and the width of the interconnection may be greater than or equal to 100 μm and less than or equal to 0.96D3. Among them, the specific value of the above D3 can be determined according to the actual application scenario. For example: the minimum spacing between two adjacent collector electrodes is D3, and the width of the interconnection may be 100 μm, 120 μm, 140 μm, 160 μm, 200 μm or 300 μm, etc. In this case, it is possible to prevent the metal composite area between the interconnection and the battery substrate from being too large due to the width of the interconnection being too large, which is beneficial to reduce the metal composite rate on one side of the battery substrate where the above-mentioned interconnection is formed. In addition, it is also possible to prevent the width of the interconnection from being too small, resulting in a small increase in the contact area between the interconnection and the interconnection in the string, ensuring that the interconnection in the string has a higher connection strength and a lower contact resistance.

[0102] Among them, the widths of different interconnects may be equal or unequal. Exemplarily, among all interconnects, the width of the interconnect located on the edge regions on both sides of the same surface along the second direction may be greater than the width of the remaining interconnects. In this case, in the actual application process, the spacing between two adjacent collector electrodes located in the middle region of the same surface along the second direction is limited to improve the collection efficiency of carriers. At this time, the setting size of the interconnect located in the middle region of the same surface along the second direction is limited. However, due to the layout setting, the spacing between two adjacent collector electrodes located on the edge regions on both sides of the same surface along the second direction can be set relatively large. At this time, among all interconnects, the width of the interconnect located on the edge regions on both sides of the same surface along the second direction is greater than the width of the remaining interconnects, which can increase the total contact area between the interconnects in the string and the corresponding interconnects, further improve the connection strength between the interconnects in the string and the corresponding interconnects, and the electrical contact performance, reduce the risk of the interconnects in the string being detached from the battery substrate, and improve the working performance of the solar cell. In this case, the difference between the width of the interconnection located on the edge regions on both sides of the same surface along the second direction and the width of the remaining interconnections can be determined based on the difference between the spacing between two adjacent collecting electrodes located on the edge regions on both sides of the same surface along the second direction and the spacing between two adjacent collecting electrodes located in the remaining areas of the same surface, and is not specifically limited here.

[0103] Exemplarily, along the first direction, the length of the interconnection portion may be greater than or equal to 0.2 mm and less than or equal to 3 mm. Exemplarily, the length of the connection portion may be 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc. In this case, along the first direction, the length of the interconnection portion is within the above range. Under the same other factors, it is possible to prevent the surface area of ​​the interconnection portion on the side away from the battery substrate from increasing to a lesser extent due to the shorter length of the interconnection portion, thereby ensuring that the interconnection portion and the interconnection member in the string have a higher connection strength and a lower contact resistance. In addition, it is also possible to prevent the surface area of ​​the interconnection portion on the side away from the battery substrate from being too large due to the longer length of the interconnection portion, thereby preventing the metal composite loss corresponding to the interconnection portion from being higher and the amount of consumables used by the interconnection portion from being larger, thereby ensuring that the solar cell has a higher operating performance and a lower manufacturing cost.

[0104] Among them, the lengths of different interconnects may be equal or unequal. Exemplarily, among all interconnects, the length of the interconnect located on the edge regions on both sides of the same surface along the second direction may be greater than the lengths of the remaining interconnects. In this case, in the actual application process, the spacing between two adjacent collector electrodes located in the middle region of the same surface along the second direction is limited to improve the collection efficiency of carriers. At this time, the setting size of the interconnect located in the middle region of the same surface along the second direction is limited. However, due to the layout setting, the spacing between two adjacent collector electrodes located on the edge regions on both sides of the same surface along the second direction can be set relatively large. At this time, among all interconnects, the length of the interconnect located on the edge regions on both sides of the same surface along the second direction is greater than the length of the remaining interconnects, which can increase the total contact area between the interconnects in the string and the corresponding interconnects, further improve the connection strength between the interconnects in the string and the corresponding interconnects, and the electrical contact performance, reduce the risk of the interconnects in the string being detached from the battery substrate, and improve the working performance of the solar cell. In this case, the difference between the length of the interconnection portion located on the edge regions on both sides of the same surface along the second direction and the length of the remaining interconnection portions can be determined based on the difference between the spacing between two adjacent collecting electrodes located on the edge regions on both sides of the same surface along the second direction and the spacing between two adjacent collecting electrodes located in the remaining areas of the same surface, and is not specifically limited here.

[0105] Of course, among all the interconnections, the lengths of the interconnections located in different regions on the same surface along the second direction may also be comparable.

[0106] Exemplarily, the height of the above-mentioned interconnection may be greater than or equal to 0.5 μm and less than or equal to 30 μm. For example, the height of the interconnection may be 0.5 μm, 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm or 30 μm, etc. In this case, the height of the interconnection is within the above range, which can prevent the interconnection parts in the string from being difficult to electrically connect with the interconnection parts with smaller heights when interconnecting different solar cells due to the smaller height of the interconnection parts, thereby reducing the difficulty of interconnection. In addition, it can also prevent the use of large amounts of consumables corresponding to the interconnection parts due to the larger height of the interconnection parts, which is conducive to reducing the manufacturing cost of solar cells. Secondly, the height range of the interconnection parts is roughly the same as the height range required for the collector electrode in the actual application scenario. Based on this, the interconnection parts and the collector electrodes can be formed simultaneously in the actual manufacturing process, thereby improving the manufacturing efficiency of solar cells and simplifying the manufacturing process of solar cells.

[0107] Specifically, as mentioned above, the height of the interconnection part can be equal to the height of the collector electrode to improve the manufacturing efficiency of the solar cell and simplify the manufacturing process of the solar cell. In addition, if in the actual manufacturing process, the setting position of the interconnection part in the string is slightly offset on at least one side where the collector electrode and the interconnection part are formed, the corresponding part of the collector electrode with the same height as the interconnection part can also be electrically connected to the interconnection part in the string to ensure that the photocurrent collected by the collector electrode can be derived through the interconnection part in the string.

[0108] Of course, in actual application, according to different actual needs, the height of the interconnection portion may be set to be greater than or less than the height of the collector electrode.

[0109] As for the minimum spacing D2 of two adjacent interconnects corresponding to two collector electrode segments adjacent to each other in the second direction, D2 is, for example, greater than or equal to 0.1 mm. For example, the minimum spacing D2 of two adjacent interconnects corresponding to two collector electrode segments adjacent to each other in the second direction can be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm or 2 mm, etc. In this case, in the actual manufacturing process, it is necessary to set a mask layer on the area where the non-electrode structure is located in the light-facing surface and / or the backlight surface. Then, under the masking action of the mask layer, a process such as laser etching is used to remove the portion of the passivation layer exposed outside the mask layer to form a conductive window. Based on this, it can be understood that a mask layer needs to be provided on the portion between two adjacent interconnects corresponding to two collector electrode segments adjacent to each other in the second direction, and the smaller the minimum spacing D2 of two adjacent interconnects corresponding to two collector electrode segments adjacent to each other in the second direction, the smaller the width of the mask layer in the portion of the minimum spacing. In the above case, D2 is greater than or equal to 0.1mm, which can prevent the difficulty in quickly and completely removing the portion of the mask layer at the minimum spacing after the electrode structure is formed due to the smaller minimum spacing D2, which makes the width of the portion of the mask layer at the minimum spacing also smaller. This ensures that after the electrode structure is formed, there is no mask layer residue at the minimum spacing between two adjacent interconnections corresponding to two collector electrode segments adjacent to each other along the second direction, which helps to reduce the difficulty of removing the mask layer and improve the efficiency of removing the mask layer.

[0110] Preferably, the above-mentioned D2 may be greater than or equal to 0.5 mm and less than or equal to 2 mm. For example, D2 may be 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm, etc. In this case, it can be understood that, when other factors are the same, the smaller the minimum spacing D2 of the two adjacent interconnects corresponding to the two collector electrode segments adjacent along the second direction, the larger the width of the two adjacent interconnects corresponding to the two collector electrode segments adjacent along the second direction, and the larger the contact area between the interconnect and the battery substrate. The larger the D2, the smaller the width of the two adjacent interconnects corresponding to the two collector electrode segments adjacent along the second direction, and the smaller the contact area between the interconnect and the interconnect in the string. In the above case, when D2 is within the above range, it can prevent the metal composite area between the interconnect and the battery substrate from being larger due to the smaller D2, which is beneficial to reduce the metal composite rate on the side of the battery substrate where the above-mentioned interconnect is formed. In addition, it is also possible to prevent the contact area between the interconnection portion and the interconnection member in the string from increasing to a smaller extent due to the larger D2, thereby ensuring that the interconnection member in the string and the interconnection portion have a higher connection strength and a lower contact resistance.

[0111] In terms of surface morphology, the surface roughness of the interconnection away from the battery substrate can be equal to the surface roughness of the collector electrode away from the battery substrate. The beneficial effect in this case is similar to the beneficial effect of the height of the interconnection being equal to the height of the collector electrode as described above, and will not be repeated here. Of course, the surface roughness of the interconnection away from the battery substrate can be different from the surface roughness of the collector electrode away from the battery substrate.

[0112] The specific surface roughness of the interconnection portion facing away from the battery substrate can be determined according to actual needs and the actual manufacturing process, and is not specifically limited here.

[0113] Exemplarily, the surface roughness of the interconnection part within every 100 square microns on the side away from the battery substrate can be less than 3 μm. For example, the surface roughness of the interconnection part within every 100 square microns on the side away from the battery substrate can be 0, 0.5 μm, 0.8 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.5 μm or 2.8 μm, etc. In this case, in the actual application process, the interconnection surface of the interconnection part in the string is relatively flat. Based on this, the surface roughness of the interconnection part within every 100 square microns on the side away from the battery substrate is within the above range, so that the surface of the interconnection part on the side away from the battery substrate is relatively flat, which is conducive to increasing the actual effective contact area between the interconnection part and the interconnection part in the string, and preventing the connection strength and contact performance between the interconnection part and the interconnection part in the string from being poor due to the large surface roughness of the interconnection part on the side away from the battery substrate, which makes the side away from the battery substrate uneven. In addition, the surface roughness range of the interconnection away from the battery substrate is roughly the same as the surface roughness range of the collector electrode away from the battery substrate in actual application scenarios. Based on this, the interconnection and the collector electrode can be formed simultaneously in the actual manufacturing process, improving the manufacturing efficiency of solar cells and simplifying the manufacturing process of solar cells.

[0114] In terms of the formation method, the above-mentioned interconnection and the collector electrode can be an integrated structure. In this case, in the actual manufacturing process, the interconnection and the collector electrode can be formed simultaneously based on the same manufacturing material, thereby improving the manufacturing efficiency of the solar cell and simplifying the manufacturing process of the solar cell. At the same time, the integrated structure of the collector electrode and the interconnection can also prevent the presence of pores at the connection between the collector electrode and the interconnection, ensuring good electrical connection performance between the two. Of course, the interconnection and the collector electrode can also be formed separately in different steps.

[0115] In terms of distribution, the collector electrode segment provided with an interconnection may correspond to only one interconnection or to multiple interconnections. It is understandable that the carriers collected by at least one collector electrode segment need to be transmitted to the interconnection within the string through the interconnection corresponding to itself, and exported by the interconnection within the string. Based on this, under the condition that other factors are the same, the fewer the number of interconnections provided on the collector electrode segment, the longer the distance that the carriers collected by at least part of the collector electrode segment need to be transmitted on the corresponding part of the collector electrode segment before they can reach the interconnection, resulting in a larger transmission resistance of the carriers on the collector electrode segment. In the above case, the collector electrode segment provided with an interconnection, and the corresponding relationship between the number of interconnections and the collector electrode segment can be determined according to its own length and the requirements for the transmission resistance of the collector electrode segment in the actual application scenario, and no specific limitation is made here.

[0116] Exemplarily, along the first direction, the length of the collector electrode segment is Lmm, and at least one collector electrode segment corresponds to N interconnects. N is a positive integer greater than or equal to 1, and the ratio between L and N can be greater than or equal to 1:1 and less than or equal to 30:1. For example, the ratio between L and N can be 1:1, 3:1, 6:1, 10:1, 15:1, 20:1, 25:1 or 30:1, etc. For example, when the length of the collector electrode segment is 30mm, the number of interconnects provided on the collector electrode segment can be 1, 3, 6, 10, 15, 20 or 30, etc. In this case, in the above case, the ratio between L and N is within the above range, which can prevent the transmission resistance of carriers on the collector electrode segment from being large due to the small ratio, and is conducive to reducing transmission losses. In addition, it can also prevent the metal composite loss between the interconnect and the battery substrate from being high due to the large number of interconnects provided on the collector electrode segment due to the small ratio, which is conducive to further improving the working performance of the solar cell.

[0117] As for all the interconnections corresponding to the same collector electrode with the interconnections, the spacing between two adjacent interconnections will also affect the transmission resistance of carriers on the collector electrode segment. Therefore, it can be determined based on the length of the collector electrode segment and the requirements for the transmission resistance of the collector electrode segment in the actual application scenario, and no specific limitation is made here.

[0118] Exemplarily, among all interconnections corresponding to the same collector electrode provided with interconnections, the spacing between two adjacent interconnections may be greater than or equal to 8 mm and less than or equal to 30 mm. For example: among all interconnections corresponding to the same collector electrode provided with interconnections, the spacing between two adjacent interconnections may be 8 mm, 10 mm, 15 mm, 20 mm, 25 mm or 30 mm, etc. In this case, when other factors are the same, among all interconnections corresponding to the same collector electrode provided with interconnections, the spacing between two adjacent interconnections is within the above range, which can prevent the larger spacing from causing a larger transmission resistance of carriers on the collector electrode, thereby helping to reduce transmission losses. In addition, it can also prevent the metal composite loss between the interconnection and the battery substrate from being higher due to the large number of interconnections provided on the collector electrode due to the smaller spacing, thereby helping to further improve the working performance of the solar cell.

[0119] In addition, in the actual application process, such as Figure 6As shown, each collector electrode segment 14 is provided with at least one interconnection 13. The number of interconnections 13 provided on each collector electrode segment 14 can refer to the above text. In this case, each collector electrode segment 14 is provided with at least one interconnection 13. In this case, the solar cell can be provided with a bus electrode or a bus electrode segment without providing the bus electrode or bus electrode segment on at least one side of the cell substrate 11 where the collector electrode 12 and the interconnection 13 are formed, and the photocurrent can be derived through the intra-string interconnection 16, which is beneficial to reduce the amount of consumables used when manufacturing the electrode structure and to control the manufacturing cost of the solar cell. At the same time, the pattern complexity of the electrode structure on the light side and / or the backlight side can be further reduced, which is beneficial to the formation of the conductive window pattern by using high-precision patterning processes such as laser etching, which is beneficial to improve the manufacturing accuracy of the collector electrode 12 and the interconnection 13, and improve the yield of the solar cell.

[0120] Or, if Figures 7 to 9 As shown, the solar cell further includes a bus electrode segment 15. All bus electrode segments 15 are located only on at least one side edge region along the second direction in one side of the battery substrate 11 on which the collector electrode 12 and the interconnection portion 13 are provided. Each bus electrode segment 15 extends along the second direction, and different bus electrode segments 15 located on the same side and the same side edge region are spaced apart along the first direction. Each bus electrode segment 15 is in electrical contact with the collector electrode 12 on the same side and the same edge region as itself. Among all the collector electrodes 12, the collector electrode 12 in electrical contact with the bus electrode segment 15 is a first type of collector electrode, and the remaining collector electrodes 12 are second type of collector electrodes. Only the collector electrode segments 14 included in the second type of collector electrode are provided with the interconnection portion 13.

[0121] When the above technical solution is adopted, Figures 7 to 9As shown, each bus electrode segment 15 is in electrical contact with the collector electrode 12 on the same surface and the same edge region as itself. The end of the bus electrode segment 15 that is away from the edge of the battery substrate 11 can be in electrical contact with the interconnection 13 adjacent to itself. At this time, when the solar cell is in a working state, the carriers collected by the collector electrode 12 (i.e., the first type of collector electrode) located on the edge region of at least one side of the light-facing surface and / or the backlight surface along the second direction can be converged to the bus electrode segment 15. At the same time, only the collector electrode segment 14 included in the second type of collector electrode is provided with the interconnection 13. Based on this, after the solar cell string provided by the embodiment of the utility model is electrically interconnected by the intra-string interconnection 16, the intra-string interconnection 16 only needs to be electrically connected to the bus electrode segment 15 to collect the carriers collected by the collector electrode 12 located on the edge area on one side of the light-facing surface and / or the backlight surface along the second direction. The end of the intra-string interconnection 16 does not need to extend to the edge areas on both sides of the battery substrate 11 along the second direction at the same time, thereby shortening the effective connection length between the intra-string interconnection 16 and the battery substrate 11, which is conducive to reducing the stress in the edge area of ​​the battery substrate 11 along the second direction, thereby reducing the risk of interconnection failure. At the same time, it is also conducive to preventing the ends of the intra-string interconnection 16 connected to two adjacent solar cells in the solar cell string included in the photovoltaic module from overlapping and causing a short circuit. Secondly, all the bus electrode segments 15 are only located on the edge areas on both sides of the light-facing surface and / or the backlight surface along the second direction. In other words, the length of the bus electrode segment 15 included in the solar cell provided by the embodiment of the utility model is less than the length of the bus electrode included in the conventional main grid solar cell. Based on this, compared with conventional main-grid solar cells, the collector electrode 12 and bus electrode segment 15 in the solar cell provided by the embodiment of the utility model have a smaller composite area with the cell substrate 11, which is conducive to making the solar cell have a larger open circuit voltage, and can also reduce the material consumption of manufacturing the bus electrode segment 15, which is conducive to controlling the manufacturing cost of the solar cell. In addition, the intra-string interconnection 16 can be electrically coupled with the second type of collector electrode without passing through the bus electrode. At this time, the transmission path of the carriers collected by the second type of collector electrode to the intra-string interconnection 16 is shorter, which is conducive to reducing transmission losses and improving the working efficiency of the solar cell string formed by the solar cell provided by the embodiment of the utility model.

[0122] Specifically, Figures 7 to 9 As shown, the end of each bus electrode segment 15 along the second direction is in electrical contact with the collector electrode 12 on the same surface and the same edge region as the bus electrode segment 15. The embodiment of the utility model does not specifically limit the morphology of the bus electrode segment 15 and the number of the bus electrode segments 15, as long as the bus electrode segment 15 can transmit the carriers collected by the collector electrode 12 on the same side edge of the same surface along the second direction to the corresponding interconnection portion 13.

[0123] Exemplarily, the length of the edge region of the side of the battery substrate provided with the collector electrode and the interconnection portion along the second direction where the busbar electrode segment is provided may be greater than or equal to 6 mm and less than or equal to 8 mm. For example, the length of the edge region of the side of the battery substrate provided with the collector electrode and the interconnection portion along the second direction where the busbar electrode segment is provided may be 6 mm, 6.2 mm, 6.4 mm, 6.6 mm, 6.8 mm, 7 mm, 7.5 mm or 8 mm, etc.

[0124] In terms of distribution, Figure 7 and Figure 8 As shown, the bus electrode segment 15 can be located only on one side edge region along the second direction of one side of the battery substrate 11 provided with the collector electrode 12 and the interconnection 13. In this case, different bus electrode segments 15 can be located on the same side edge region along the second direction of one side of the battery substrate 11 provided with the collector electrode 12 and the interconnection 13, or can be located on different side edge regions along the second direction of one side of the battery substrate 11 provided with the collector electrode 12 and the interconnection 13. In this case, the same intra-string interconnection 16 can extend only from one end of the bus electrode segment 15 close to the corresponding interconnection 13, without extending from the first end of the battery substrate 11 along the second direction to the other end, which is conducive to reducing the length of the intra-string interconnection 16, and further conducive to controlling the manufacturing cost of the photovoltaic module including the solar cell provided by the embodiment of the utility model.

[0125] Or, if Fig. 9 As shown, the bus electrode segment 15 can be located on the edge regions on both sides along the second direction of one side of the battery substrate 11 provided with the collector electrode 12 and the interconnection portion 13. In this case, the effective interconnection length between the intra-string interconnection member 16 and the battery substrate 11 can be further reduced, the interconnection stress can be further reduced, and the risk of bending of the battery substrate 11 after the interconnection can be reduced. In addition, another possible implementation scheme can be provided for the arrangement of the bus electrode segment 15 on the side of the battery substrate 11 provided with the collector electrode 12 and the interconnection portion 13, so as to facilitate the selection of a suitable scheme according to the requirements of different actual application scenarios, and to improve the applicability of the solar cell provided by the embodiment of the utility model in different application scenarios.

[0126] For example, when the solar cell further includes a bus electrode segment, the bus electrode segment and the collector electrode can be an integrated structure. The beneficial effects in this case can be analyzed with reference to the beneficial effects of the collector electrode and the interconnection portion being an integrated structure as described above, and will not be repeated here.

[0127] For example, the busbar electrode segment and the interconnection portion are an integrated structure. The beneficial effects in this case can be analyzed with reference to the beneficial effects of the busbar electrode and the interconnection portion being an integrated structure as described above, and will not be repeated here.

[0128] Of course, the bus electrode segments, the collector electrodes, and the interconnection portions may also be formed separately in different steps.

[0129] In terms of materials, the material of the busbar electrode segment may include at least one conductive material, as long as it can be applied to the solar cell provided in the embodiment of the utility model.

[0130] Exemplarily, the material of the above-mentioned bus electrode segment includes one or more combinations of gold, silver, copper, aluminum, nickel, chromium, titanium and tin. For example: the material of the bus electrode segment may include only one of gold, silver, copper, aluminum, nickel, chromium, titanium and tin. For another example: the material of the bus electrode segment may include a combination of any two of gold, silver, copper, aluminum, nickel, chromium, titanium and tin (such as aluminum-nickel alloy or aluminum-tin alloy, etc.). For another example: the material of the bus electrode segment may include a combination of any three of gold, silver, copper, aluminum, nickel, chromium, titanium and tin. In the above case, the material of the bus electrode segment has a variety of optional types. And the manufacturing process of the bus electrode segment corresponding to different material types may be different. Therefore, when the material of the bus electrode segment includes the above-mentioned types, a variety of manufacturing processes can be used to form the bus electrode segment, which is conducive to improving the applicability of the solar cell provided by the embodiment of the utility model in different application scenarios.

[0131] It should be noted that, regardless of whether the solar cell includes a busbar electrode segment, when at least two collector electrode segments distributed along the second direction are provided with interconnections, among all interconnections located on the same surface, different interconnections located in the same column along the second direction may be staggered or aligned along the second direction. Among them, when different interconnections located in the same column along the second direction are along the second direction, the distribution of the interconnections is relatively regular, which is conducive to reducing the difficulty of electrically interconnecting different solar cells.

[0132] In a second aspect, an embodiment of the utility model provides a photovoltaic assembly, which includes the solar cell provided by the first aspect and various implementations thereof, and an intra-string interconnector that connects two adjacent solar cells in series. Each intra-string interconnector is at least electrically connected to an interconnection portion included in a corresponding solar cell.

[0133] The beneficial effects of the second aspect in the embodiment of the utility model can be analyzed by referring to the beneficial effects of the first aspect and its various implementation methods, and will not be repeated here.

[0134] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A solar cell, characterized in that: include: A battery substrate, and a collector electrode and an interconnection portion arranged on the light-facing surface and / or the backlight surface of the battery substrate; wherein, The collector electrodes located on the same surface have the same conductivity type, and the multiple collector electrodes located on the same surface extend along the first direction and are spaced apart along the second direction; the first direction is different from the second direction; each collector electrode comprises a plurality of collector electrode segments distributed along the first direction; at least some of the collector electrode segments are provided with the interconnection portion; Along the second direction, the width of each interconnection is D1; ​​among all the collecting electrodes located on the same surface, there are two collecting electrode segments adjacent to each other along the second direction, each of which is provided with at least one interconnection, and the minimum spacing between two adjacent interconnections corresponding to two collecting electrode segments adjacent to each other along the second direction is D2, and the ratio of D1 to D2 is greater than or equal to 5:1 and less than or equal to 20:

1.

2. The solar cell according to claim 1, characterized in that: D2 is greater than or equal to 0.1 mm; or D2 is greater than or equal to 0.5 mm and less than or equal to 2 mm.

3. The solar cell according to claim 1, characterized in that Along the second direction, the minimum distance between two adjacent collector electrodes is D3, and the width of the interconnection portion is greater than or equal to 100 μm and less than or equal to 0.96D3; and / or, Along the first direction, the length of the interconnection portion is greater than or equal to 0.2 mm and less than or equal to 3 mm; and / or, The height of the interconnection portion is greater than or equal to 0.5 μm and less than or equal to 30 μm; and / or, The height of the interconnection portion is equal to the height of the collecting electrode.

4. The solar cell according to claim 1, characterized in that The surface roughness of the interconnection portion facing away from the battery substrate within a range of 100 square micrometers is less than 3 μm; and / or, The surface roughness of the interconnection portion at a side facing away from the battery substrate is equal to the surface roughness of the collector electrode at a side facing away from the battery substrate.

5. The solar cell according to claim 1, characterized in that: The interconnection portion and the collector electrode are an integral structure.

6. The solar cell according to claim 1, characterized in that The two adjacent collector electrode segments included in the same collector electrode are spaced apart and distributed along the first direction.

7. The solar cell according to claim 6, characterized in that: The number of the collector electrode segments included in the at least one collector electrode is greater than or equal to 2 and less than or equal to 5; and / or, Along the first direction, the length of at least one of the collector electrode segments is greater than or equal to 30 mm and less than or equal to 60 mm; and / or, The spacing between each two adjacent collector electrode segments included in the same collector electrode is greater than or equal to 0.01 mm and less than or equal to 1 mm.

8. The solar cell according to claim 6, characterized in that: The spacing between each two adjacent collecting electrode segments included in the same collecting electrode is greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

9. The solar cell according to any one of claims 1 to 8, characterized in that: Among all the interconnections located on the same surface, different interconnections located in the same column along the second direction are aligned along the second direction; and / or, Different collecting electrode segments in the same column along the second direction are aligned along the second direction.

10. The solar cell according to any one of claims 1 to 8, characterized in that: Along the first direction, the length of the collector electrode segment is L mm, at least one collector electrode segment corresponds to N interconnections; N is a positive integer greater than or equal to 1, and the ratio between L and N is greater than or equal to 1:1 and less than or equal to 30:1; and / or, Among all the interconnections corresponding to the same collector electrode provided with the interconnections, a distance between two adjacent interconnections is greater than or equal to 8 mm and less than or equal to 30 mm.

11. The solar cell according to any one of claims 1 to 8, characterized in that: Each of the current collecting electrode segments is provided with at least one of the interconnecting portions; or, The solar cell also includes bus electrode segments; all of the bus electrode segments are located only on at least one edge region along the second direction of a side of the cell substrate on which the collecting electrode and the interconnection portion are provided; each of the bus electrode segments extends along the second direction, and different bus electrode segments located on the same side and on the edge region are spaced apart along the first direction; each bus electrode segment is in electrical contact with the collecting electrode on the same side and on the same edge region as itself; among all of the collecting electrodes, the collecting electrode in electrical contact with the bus electrode segment is a first type of collecting electrode, and the remaining collecting electrodes are second type of collecting electrodes; only the collecting electrode segments included in the second type of collecting electrodes are provided with the interconnection portion.

12. The solar cell according to claim 11, characterized in that: The bus electrode segment and the collector electrode are an integral structure; and / or the bus electrode segment and the interconnection portion are an integral structure.

13. The solar cell according to any one of claims 1 to 8, characterized in that: The solar cell is a solar cell with double-sided light reception; the collecting electrodes and the interconnecting parts are both arranged on the light-facing surface and the backlight surface.

14. A photovoltaic module, characterized in that: include: The solar cell according to any one of claims 1 to 13; and an intra-string interconnector for connecting two adjacent solar cells in series; each of the intra-string interconnectors is electrically connected to the interconnection portion included in the corresponding solar cell.

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