A back-contact gridless solar cell and photovoltaic module

Abstract

This utility model discloses a back-contact gridless solar cell and a photovoltaic module. The back-contact gridless solar cell includes: a cell body, comprising: alternating first and second electrode regions and an isolation groove between the first and second electrode regions; multiple first insulating protective components; multiple second insulating protective components; the first electrode regions alternately have a first busbar region and a first isolation region, the first busbar region being wider than the first isolation region, and the first insulating protective component being disposed in the first isolation region; the second electrode regions alternately have a second busbar region and a second isolation region, the second busbar region being wider than the second isolation region, and the second insulating protective component being disposed in the second isolation region, with the first busbar region corresponding to the second isolation region and vice versa. This back-contact gridless solar cell can avoid leakage and short circuit problems in the first and second electrode regions.

Description

Technical Field

[0001] This utility model relates to a back-contact gridless solar cell and photovoltaic module. Background Technology

[0002] Back-contact gridless solar cells combine the advantages of both back-contact solar cells (BC) and gridless interconnect (OBB) technology. By placing the electrodes on the back of the cell, the light-receiving area on the front of the cell is increased, thereby significantly improving photoelectric conversion efficiency. Furthermore, through gridless interconnect technology, the cells are directly connected using solder ribbons, eliminating the need for main grid lines, reducing the amount of metal paste used, lowering costs, and also increasing module power through optimized solder ribbon layout.

[0003] Currently, back-contact gridless solar cells feature alternating P-regions and N-regions on the back side, with electrical isolation between adjacent P-regions and N-regions achieved through isolation trenches. In the fabrication of photovoltaic modules using back-contact gridless solar cells or cells obtained from split back-contact gridless solar cells, solder paste is typically used to connect the solder ribbons to the fine grid lines in the P-regions or N-regions. During the photovoltaic module lamination process, the solder ribbons apply pressure to the solder paste, causing the solder paste to press against the edges of the P-regions or N-regions. This can damage the edges of the functional layers in the P-regions or N-regions, leading to a relatively high risk of leakage and short circuits in these areas. Utility Model Content

[0004] In view of this, the present invention provides a back-contact gridless solar cell and photovoltaic module. The back-contact gridless solar cell is connected to the second electrode area through multiple first insulating protective components and multiple second insulating protective components and connected to the first electrode area. At the same time, because the first busbar area is wider than the first isolation area and the second busbar area is wider than the second isolation area, the stress-bearing area of ​​the first busbar area and the second busbar area can be increased. During the lamination process, the pressure damage to the edges of the first electrode area and the edges of the second electrode area is effectively reduced, thereby reducing or even avoiding the risk of leakage and short circuit at the edges of the first electrode area and the edges of the second electrode area.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] In a first aspect, this utility model provides a back-contact gridless solar cell, comprising:

[0007] The battery body has the following back side: alternating first electrode regions and second electrode regions, and an isolation groove disposed between adjacent first electrode regions and second electrode regions.

[0008] In the extending direction of each of the first electrode regions, a plurality of first insulating protective elements are provided at intervals;

[0009] In the extending direction of each second electrode region, a plurality of second insulating protective elements are provided at intervals;

[0010] The first electrode region is alternately arranged with a first bus region and a first isolation region. On both sides of the width direction of the first electrode region, the first bus region is wider than the first isolation region. The first insulating protective component is disposed in the first isolation region. The first bus region of each first electrode region corresponds to the first isolation region of each first electrode region.

[0011] The second electrode region has alternating second bus regions and second isolation regions. On both sides of the width direction of the second electrode region, the second bus region is wider than the second isolation region. The second insulating protective component is disposed in the second isolation region. The second bus regions of each second electrode region correspond to each other, and the first isolation regions of each second electrode region correspond to each other.

[0012] In the width direction of the first electrode region and the second electrode region, the first bus region corresponds to the second isolation region, and the second bus region corresponds to the first isolation region.

[0013] In a second aspect, this utility model provides a photovoltaic module, comprising: a back-contact gridless solar cell provided in the first aspect embodiment or a back-contact gridless cell segmented from the back-contact gridless solar cell provided in the first aspect embodiment, and a connection structure;

[0014] The connection structure is used to connect the fine grid lines of the first electrode region or the fine grid lines of the second electrode region of the back-contact gridless solar cell or the back-contact gridless cell.

[0015] For each pair of adjacent back-contact gridless solar cells or each pair of adjacent back-contact gridless solar cells,

[0016] In the extending direction of the connection structure, a portion of the connection structure covers over a plurality of second insulating protective members of a back-contact gridless solar cell or a back-contact gridless cell, and is electrically connected to a fine grid segment in a plurality of first busbar regions corresponding to the first electrode region of the back-contact gridless solar cell or the back-contact gridless cell. In the extending direction of the connection structure, the plurality of first busbar regions where the fine grid segment connected by the connection structure is located correspond to the plurality of second insulating protective members covered by the connection structure.

[0017] In the extending direction of the connection structure, another portion of the connection structure covers over a plurality of the first insulating protective elements of an adjacent back-contact gridless solar cell or a back-contact gridless cell, and is electrically connected to the fine grid segments in a plurality of second bus regions corresponding to the second electrode region of the back-contact gridless solar cell or the back-contact gridless cell. In the extending direction of the connection structure, the plurality of second bus regions where the fine grid segments connected by the connection structure are located correspond to the plurality of the first insulating protective elements covered by the connection structure.

[0018] The first aspect of the above-mentioned utility model has the following advantages or beneficial effects:

[0019] The back-contact gridless solar cell provided in this embodiment increases the force-bearing area of ​​the first and second current-carrying regions by widening the first current-carrying region relative to the first isolation region on both sides of the width direction of the first electrode region, and widening the second current-carrying region relative to the second isolation region on both sides of the width direction of the second electrode region. By having the first current-carrying region correspond to the second isolation region, and the second current-carrying region correspond to the first isolation region, during the subsequent bonding process of the connection structure located in the first and second current-carrying regions and lamination, the first current-carrying region cooperates with the second insulating protective component located in the second isolation region, and the second current-carrying region cooperates with the first insulating protective component located in the first isolation region. This effectively reduces pressure damage to the edges of the first and second electrode regions, thereby reducing or even avoiding the risk of leakage and short circuits at the edges of the first and second electrode regions. This effectively improves the efficiency of the back-contact gridless solar cell and helps improve the yield and reliability of the photovoltaic modules fabricated from this back-contact gridless solar cell. Attached Figure Description

[0020] Figure 1A This is a schematic diagram of the back structure of a back-contact gridless solar cell in the prior art;

[0021] Figure 1B This is a partial cross-sectional structural diagram of a back-contact gridless solar cell in the prior art;

[0022] Figure 2 This is a schematic diagram of the first back-side structure of a back-contact gridless solar cell according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the second back-side structure of a back-contact gridless solar cell according to an embodiment of the present invention;

[0024] Figure 4This is a schematic diagram of the third back-side structure of a back-contact gridless solar cell according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram showing the relative relationship between the first electrode region and the second electrode region in a back-contact gridless solar cell according to an embodiment of the present invention;

[0026] Figure 6 This is a partial cross-sectional structural schematic diagram of a back-contact gridless solar cell according to an embodiment of the present invention;

[0027] Figure 7 This is a partial cross-sectional structural schematic diagram of a back-contact gridless solar cell according to another embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the fourth back-side structure of a back-contact gridless solar cell according to an embodiment of the present invention;

[0029] Figure 9 According to the embodiments of this utility model, the corresponding Figure 8 A schematic diagram showing the relative relationship between the first electrode region and the second electrode region in the fourth type of back-side structure;

[0030] Figure 10 This is a schematic diagram of the connection relationship between back-contact gridless solar cells in a photovoltaic module according to an embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the main process in the fabrication method of a back-contact gridless solar cell according to an embodiment of the present invention.

[0032] The attached figures are labeled as follows:

[0033] 10-Battery body; 11-First electrode region; 11'-P region; 111-First busbar region; 112-First isolation region; 12-Second electrode region; 12'-N region; 121-Second busbar region; 122-Second isolation region; 13-Isolation groove; 14-Fine grid line; 15-Insulating layer; 20-First insulating protective component; 30-Second insulating protective component; 40-First electrical contact point; 50-Second electrical contact point; 60-First insulating positioning component; 70-Second insulating positioning component; 80-Connection structure. Detailed Implementation

[0034] like Figure 1A and Figure 1BAs shown, in existing back-contact gridless solar cells, insulating layers 15 are spaced apart on the fine grid lines 14 of P-region 11' and N-region 12', respectively. The insulating layers 15 on P-region 11' and N-region 12' are staggered, so that the spaced fine grid lines 14 of N-region 12' are connected in series with solder ribbons at the locations where the insulating layers 15 are laid in P-region 11' to collect the charge carriers generated in N-region 12', and vice versa. In other words, the insulating layers 15 isolate the connection between the solder ribbons and the fine grid lines 14 below the insulating layers 15.

[0035] Currently, for back-contact gridless solar cells, solder paste is generally used to connect the fine grid lines 14 in series with the solder ribbon (i.e., solder paste is applied between the fine grid lines 14 and the solder ribbon). However, due to the relatively small width of the P-region 11' and N-region 12' (generally around 500 μm), during the process of the solder ribbon applying a force towards the back-contact gridless solar cell, the solder paste may compress the edge of the P-region 11' or N-region 12', causing damage to the edge of the adjacent isolation trench 13 of the P-region 11' and N-region 12', resulting in leakage and short circuits. In addition, the insulating layer 15, under the force applied by the solder ribbon towards the back-contact gridless solar cell, also risks compressing the edge of the P-region 11' or N-region 12', further damaging the edge of the adjacent isolation trench 13 of the P-region 11' and N-region 12', increasing leakage and short circuits, and thus affecting the conversion efficiency of the back-contact gridless solar cell.

[0036] In addition, for back-contact gridless solar cells, the current process for manufacturing photovoltaic modules using them involves first fixing the solder ribbon and solder paste, and then further stabilizing the solder ribbon and solder paste in the subsequent lamination process. During the lamination process, solder ribbon displacement and grid breakage problems are prone to occur, resulting in low yield and reliability of photovoltaic modules produced based on back-contact gridless solar cells.

[0037] To address the aforementioned problems with the structure of existing back-contact gridless solar cells and the photovoltaic modules fabricated from them, this invention provides a novel back-contact gridless solar cell, a photovoltaic module, and a method for fabricating such a cell.

[0038] The back-contact gridless solar cell of this utility model generally refers to a solar cell in which a first electrode region 11 and a second electrode region 12 are alternately arranged on the back side, wherein an isolation trench 13 is provided between each two adjacent first electrode regions 11 and second electrode regions 12. Understandably, the first electrode region 11, the second electrode region 12, and the isolation trench 13 can all be obtained using existing technologies, such as plasma chemical vapor deposition, low-pressure chemical vapor deposition, atomic layer chemical vapor deposition, laser grooving, wet etching, etc. Furthermore, the first electrode region 11 and the second electrode region 12 are generally regions with opposite conductivity types. For example, the doped layer contained in the first electrode region 11 is generally doped with P-type doped atoms (such as boron atoms); the doped layer contained in the second electrode region 12 is generally doped with N-type doped atoms (such as phosphorus atoms). For example, the first electrode region 11 includes an intrinsic amorphous silicon film layer and a boron-doped silicon-containing thin film layer stacked from the inside out (or the first electrode region 11 includes a tunneling oxide layer and a boron-doped polycrystalline silicon layer stacked from the inside out), and the second electrode region 12 includes an intrinsic amorphous silicon film layer and a phosphorus-doped silicon-containing thin film layer stacked from the inside out (or the second electrode region 12 includes a tunneling oxide layer and a phosphorus-doped polycrystalline silicon layer stacked from the inside out). Furthermore, additional film layers, such as conductive film layers, passivation layers, or passivation antireflection layers, may be present outside the doped layers (e.g., boron-doped silicon-containing thin film layer or boron-doped polycrystalline silicon layer) of the first electrode region 11 and the doped layers (e.g., phosphorus-doped silicon-containing thin film layer or phosphorus-doped polycrystalline silicon layer) of the second electrode region 12. Additionally, the first electrode region 11 and the second electrode region 12 may also contain other film layers, and the isolation trench 13 may also contain other film layers (e.g., passivation layers). Regardless of whether the first electrode region 11, the second electrode region, and the isolation trench 13 have more film layers, or whether the front side of the back contact solar cell contains more film layers (such as passivation layer, passivation antireflection layer, ultraviolet light conversion film layer, etc.), as long as the first electrode region 11 and the second electrode region 12 are on the back side of the solar cell, and an isolation trench 13 is provided between each adjacent first electrode region 11 and second electrode region 12, the structure is within the protection scope of the present utility model.

[0039] It is worth noting that the terms "first" and "second" in this embodiment of the utility model are mainly used to distinguish different structural positions. For example, the first insulating protective member 20 refers to the insulating protective member disposed in the first isolation area 112 of the first electrode region 11, and the second insulating protective member 30 refers to the insulating protective member disposed in the second isolation area 122 of the second electrode region 12; the first square wave-shaped side refers to the waveform structure belonging to the side of the first electrode region; the second square wave-shaped side refers to the waveform structure belonging to the side of the second electrode region 12; the first electrical contact Point 40 refers to an electrical contact point located on the first bus region 111 and electrically connected to the connecting structure 80 (such as a solder strip, conductive wire, etc.); the second electrical contact point 50 refers to an electrical contact point located on the second bus region 121 and electrically connected to the connecting structure 80 (such as a solder strip, conductive wire, etc.); the first insulating positioning element 60 refers to an insulating positioning element located on the first bus region 111 and disposed on both sides of the first electrical contact point 40; the second insulating positioning element 70 refers to an insulating positioning element located on the second bus region 121 and disposed on both sides of the second electrical contact point 50.

[0040] in, Figures 2 to 4 as well as Figure 8 This is a schematic diagram of the back structure of various structures of a back-contact gridless solar cell according to an embodiment of the present invention. Figure 6 and Figure 7 These are partial cross-sectional structural schematic diagrams of a back-contact gridless solar cell according to an embodiment of the present invention. Figure 5 and Figure 9 This is a schematic diagram showing the relative relationship between the first electrode region 11 and the second electrode region 12 according to an embodiment of the present invention.

[0041] like Figures 2 to 4 , Figures 6 to 9 As shown, the back-contact gridless solar cell may include: a cell body 10, a plurality of first insulating protective elements 20 and a plurality of second insulating protective elements 30.

[0042] Specifically, such as Figures 2 to 4 , Figures 6 to 9 As shown, the battery body 10 has the following back side: alternating first electrode regions 11 and second electrode regions 12, and an isolation groove 13 disposed between adjacent first electrode regions 11 and second electrode regions 12.

[0043] Among them, the battery body 10 is generally a collective term for the substrate (such as a single crystal silicon substrate) and the various functional layers and fine grid lines 14 formed on the substrate.

[0044] For the first electrode region 11 and the second electrode region 12, such as Figures 2 to 5 , Figure 8 and Figure 9As shown, the first electrode region 11 has alternating arrangements of a first bus region 111 and a first isolation region 112. On both sides of the width direction of the first electrode region 11, the first bus region 111 is wider than the first isolation region 112. The second electrode region 12 has alternating arrangements of a second bus region 121 and a second isolation region 122. On both sides of the width direction of the second electrode region 12, the second bus region 121 is wider than the second isolation region 122.

[0045] Furthermore, such as Figures 2 to 4 , Figures 6 to 8 As shown, the first insulating protective component 20 is disposed in the first isolation area 112, corresponding to the first busbar area 111 of each first electrode area 11 and the first isolation area 112 of each first electrode area 11; the second insulating protective component 30 is disposed in the second isolation area 122, corresponding to the second busbar area 121 of each second electrode area 12 and the second isolation area 122 of each second electrode area 12.

[0046] In the width direction of the first electrode region 11 and the second electrode region 12 ( Figures 2 to 4 , Figures 6 to 8 (As shown in the S2 direction), the first merging region 111 corresponds to the second isolation region 122, and the second merging region 121 corresponds to the first isolation region 112.

[0047] Specifically, regarding the relationship between the multiple first insulating protective components 20 and the battery body 10: such as Figures 2 to 4 as well as Figure 8 As shown, in the extension direction of each first electrode region 11 (e.g.) Figures 2 to 4 as well as Figure 8 In the direction S1 shown, multiple first insulating protective elements 20 are spaced apart, and the multiple first insulating protective elements 20 are respectively disposed in the first isolation area 112. Regarding the relationship between the multiple second insulating protective elements 30 and the battery body 10: as follows... Figures 2 to 4 as well as Figure 8 As shown, in the extension direction of each second electrode region 12 (e.g.) Figures 2 to 4 as well as Figure 8 In the direction S1), multiple second insulating protective components 30 are arranged at intervals, and the multiple second insulating protective components 30 are respectively arranged in the second isolation area 122.

[0048] Understandably, such as Figures 2 to 4 as well as Figures 8 to 10As shown, a first electrode region 11 is provided with fine grid lines 14, which extend along the extension direction S1 of the first electrode region 11. A first insulating protective member 20 covers the fine grid segment of the fine grid lines 14 in the first electrode region 11 that corresponds to the first isolation region 112. A second electrode region 12 is also provided with fine grid lines 14, which extend along the extension direction S1 of the second electrode region 12. A second insulating protective member 30 covers the fine grid segment of the fine grid lines 14 in the second electrode region 12 that corresponds to the second isolation region 122.

[0049] The back-contact gridless solar cell provided in this embodiment of the invention increases the force-bearing area of ​​the first and second busbar regions 111 and 121 by widening the first busbar region 111 relative to the first isolation region 112 on both sides of the width direction of the first electrode region 11, and by widening the second busbar region 121 relative to the second isolation region 122 on both sides of the width direction of the second electrode region 12. Furthermore, by aligning the first busbar region 111 with the second isolation region 122 and the second busbar region 121 with the first isolation region 112, a connection structure 80 is subsequently disposed in the first and second busbar regions 111 and 121 respectively. 121, and during the lamination process, the first busbar region 111 cooperates with the second insulating protective member 30 disposed in the second isolation region 122, and the second busbar region 121 cooperates with the first insulating protective member 20 disposed in the first isolation region 112, effectively reducing pressure damage to the edges of the first electrode region 11 and the edges of the second electrode region 12, thereby reducing or even avoiding the risk of leakage and short circuit at the edges of the first electrode region 11 and the edges of the second electrode region 12, thereby effectively improving the efficiency of the back contact gridless solar cell, and helping to improve the yield and reliability of the photovoltaic module prepared by the back contact gridless solar cell.

[0050] Furthermore, by widening the first bus region 111 relative to the first isolation region 112 and the second bus region 121 relative to the second isolation region 122, it is possible to ensure that the first bus region 111 and the second bus region 121 have relatively wide widths, which allows the connecting structure 80 (such as solder ribbon, conductive wire, etc.) to have a relatively large contact area with it. On the one hand, this can prevent the solder used for welding from flowing into the isolation groove 13; on the other hand, the cooperation between the first bus region 111 and the second insulating protective component 30 and the cooperation between the second bus region 121 and the first insulating protective component 20 can reduce the stress of the connecting structure 80 on the edges of the first electrode region 11 and the second electrode region 12, further reducing the risk of damage to the edges of the first electrode region 11 and the second electrode region 12.

[0051] In the back-contact gridless solar cell provided in this embodiment of the present invention, the relative positional relationship between the first insulating protective member 20 and the first isolation region 112 and the relative positional relationship between the second insulating protective member 30 and the second isolation region 122 can be varied.

[0052] Specifically, such as Figure 2 As shown, in the first relative positional relationship: the first insulating protective element 20 is disposed on the first isolation area 112 and does not exceed the edge of the first isolation area 112, and the second insulating protective element 30 is disposed on the second isolation area 122 and does not exceed the edge of the second isolation area 122. Figure 3 As shown, the second relative positional relationship is as follows: the first insulating protective element 20 is disposed on the first isolation area 112 and extends to the adjacent isolation grooves 13 on both sides of the first isolation area 112; the second insulating protective element 30 is disposed on the second isolation area 122 and extends to the adjacent isolation grooves 13 on both sides of the second isolation area 122. Figure 4 , Figures 6 to 8 As shown, in the third relative positional relationship: the first insulating protective member 20 is disposed on the first isolation region 112 and spans the isolation grooves 13 located on both sides of the width direction of the first isolation region 112; the second insulating protective member 30 is disposed on the second isolation region 122 and spans the isolation grooves 13 located on both sides of the second isolation region 122. More preferably, as shown... Figure 4 , Figures 6 to 8 As shown, the first insulating protective element 20 extends to the second busbar area 121 adjacent to the first isolation area 112 where the first insulating protective element 20 is located, and the second insulating protective element 30 extends to the first busbar area 111 adjacent to the second isolation area 122 where the second insulating protective element 30 is located.

[0053] For example, such as Figure 4 As shown, in the width direction S2 of the first electrode region 11, the first insulating protective element 20 on different first electrode regions 11 (such as...) Figure 4 The exemplary examples 20-1, 20-2 and 20-3 correspond to each other in the width direction S2 of the first electrode region 11. Preferably, in the width direction S2 of the first electrode region 11, the center lines of the corresponding first insulating protective members 20 on different first electrode regions 11 are on the same straight line and the side edges of the corresponding first insulating protective members 20 on different first electrode regions 11 extending along the width direction S2 are also on the same straight line, so as to facilitate the use of a standard printing plate to simultaneously set the first insulating protective members 20 for different first electrode regions 11.

[0054] In addition, such as Figure 4 As shown, in the width direction S2 of the second electrode region 12, the second insulating protective element 30 on different second electrode regions 12 (such as...) Figure 4The 30-1 and 30-2 shown by example correspond to each other in the width direction S2 of the second electrode region 12. Preferably, in the width direction S2 of the second electrode region 12, the center lines of the corresponding second insulating protective members 30 on different second electrode regions 12 are on the same straight line, and the side edges of the corresponding second insulating protective members 30 on different second electrode regions 12 extending along the width direction S2 are also on the same straight line, so as to facilitate the use of a standard printing plate to simultaneously set the second insulating protective members 30 for different second electrode regions 12.

[0055] In addition, the aforementioned second insulating protective components 30 and first insulating protective components 20 can be installed simultaneously.

[0056] Through the first insulating protective element 20 and the second insulating protective element 30, during the subsequent stringing of cells using the back-contact gridless solar cell or the stringing of cells cut from the back-contact gridless solar cell, the connecting structure 80 (such as solder ribbon, conductive wire, etc.) passes through the first insulating protective element 20 and is electrically connected to the fine grid segment corresponding to the second busbar region 121 in the fine grid line 14 on the second electrode region 12. The first insulating protective element 20 can prevent the connecting structure 80 from contacting the first electrode region 11 and can prevent the connecting structure 80 from pressing against the edges of the first electrode region 11 and the second electrode region 12. In addition, the connecting structure 80 (such as solder ribbon, conductive wire, etc.) passes through the second insulating protective element 30 and is electrically connected to the fine grid segment corresponding to the first busbar region 111 in the fine grid line 14 on the first electrode region 11. The second insulating protective element 30 can prevent the connecting structure 80 from contacting the second electrode region 12 and can prevent the connecting structure 80 from pressing against the edges of the first electrode region 11 and the second electrode region 12.

[0057] In addition, such as Figure 5 and Figure 9 As shown, the width D3 of the aforementioned isolation groove 13 is generally set to 100μm to 900μm. For example, the width D3 of the isolation groove 13 can be set to 100μm, 300μm, 450μm, 600μm, 800μm, or 900μm, etc. By setting the width D3 of the isolation groove 13, on the one hand, the isolation requirement between the first electrode region 11 and the second electrode region 12 can be met; on the other hand, the first insulating protective member 20 and the second insulating protective member 30 can cooperate with the isolation groove 13, which can better support the edges of the first electrode region 11 and the second electrode region 12, thereby further reducing the risk of damage to the edges of the first electrode region 11 and the second electrode region 12.

[0058] More specifically, such as Figures 2 to 5 , Figures 8 to 10As shown, each first electrode region 11 has two opposite first square wavy sides, wherein the peaks and troughs of the two first square wavy sides correspond to each other; the peaks and troughs of the first square wavy sides of each first electrode region 11 correspond to each other; the first confluence region 111 corresponds to the peak region of the first square wavy side; and the first isolation region 112 corresponds to the trough region of the first square wavy side.

[0059] In addition, each second electrode region 12 has two opposite second square wavy sides, wherein the crests and troughs of the two second square wavy sides correspond to each other; the crests and troughs of the second square wavy sides of each second electrode region 12 correspond to each other; the crest of the second square wavy side of the second electrode region 12 corresponds to the trough of the first square wavy side of the first electrode region 11, and the trough of the second square wavy side of the second electrode region 12 corresponds to the crest of the first square wavy side of the first electrode region 11; the second busbar region 121 corresponds to the crest region of the second square wavy side; and the second insulating protective member 30 corresponds to the trough region of the second square wavy side.

[0060] It is worth noting that, regarding Figure 5 and Figure 9 In the case where the sides of the first electrode region 11 and the second electrode region 12 shown are both square wave structures, the spacing between the sides of adjacent first electrode regions 11 and second electrode regions 12 (i.e., the width D3 of the isolation groove 13) is consistent in the extending direction of the first electrode region 11 and the second electrode region 12.

[0061] It is worth noting that the first insulating protective component 20 and the second insulating protective component 30 mentioned above can be made of insulating adhesive commonly used in photovoltaic modules. They can be fluidly applied to specific locations on the battery body 10 via a printed circuit board and then cured, or they can be pre-formed as shown in the image. Figure 6 and Figure 7 The illustrated cover-shaped insulating protective member has a portion that is embedded in the isolation groove 13. A first insulating protective member 20 is obtained by covering the first electrode region 11 across the width direction S2 and the isolation grooves 13 on both sides of the first electrode region 11 with the cover-shaped insulating protective member. A second insulating protective member 30 is obtained by covering the second electrode region 12 across the width direction S2 and the isolation grooves 13 on both sides of the second electrode region 12 with the cover-shaped insulating protective member.

[0062] against Figures 2 to 4 , Figure 8 and Figure 10The provided back-contact gridless solar cell has multiple first insulating protective members 20 spaced apart in the extension direction S1 of each first electrode region 11. Each first insulating protective member 20 covers and spans the first electrode region 11 and the isolation grooves 13 located on both sides of the first electrode region 11 in the width direction S2. After a connection structure 80 is subsequently set above the first insulating protective member 20 to connect to the fine grid segment corresponding to the second busbar region 121 in the fine grid line of the second electrode region 12, the presence of the first insulating protective member 20 can support the edges of the second electrode region 12 and the first electrode region 11, thereby reducing or even avoiding damage to the edges of the second electrode region 12 and the first electrode region 11. Furthermore, each second insulating protective member 30 covers and spans the second electrode region 12 and the isolation grooves 13 located on both sides of the second electrode region 12 in the width direction S2. After a connection structure 80 is subsequently set above the second insulating protective member 30 to connect to the fine grid segment corresponding to the first busbar region 111 in the fine grid line of the first electrode region 11, the presence of the second insulating protective member 30 can support the edges of the second electrode region 12 and the first electrode region 11, reducing or even avoiding damage to the supporting edges of the second electrode region 12 and the first electrode region 11. Therefore, the back-contact gridless solar cell provided by this utility model embodiment can reduce or even avoid the risk of leakage and short circuit at the edges of the first electrode region 11 and the second electrode region 12, thereby effectively improving the efficiency of the back-contact gridless solar cell and helping to improve the yield and reliability of the photovoltaic module prepared by the back-contact gridless solar cell.

[0063] Furthermore, such as Figure 3 , Figure 7 and Figure 8 As shown, in the width direction S2 of the first electrode region 11, the first insulating protective member 20 extends to the edge of the second electrode region 12 that is close to both sides of the first electrode region 11.

[0064] Preferably, the width of the first insulating protective member 20 extending from the edge of the adjacent second electrode region 12 (e.g.) Figure 8 The width D1 shown is 50μm to 100μm. For example, the width of the edge of the second electrode region 12 that the first insulating protective member 20 extends to can be 50μm, 60μm, 70μm, 80μm, 90μm or 100μm, etc. By designing the width of the edge of the second electrode region 12 that the first insulating protective member 20 extends to, the first insulating protective member 20 can simultaneously support the edge of the second electrode region 12 and the edge of the first electrode region 11, thereby improving the reliability of the first insulating protective member 20 in supporting the edge of the second electrode region 12 and the edge of the first electrode region 11.

[0065] In addition, such as Figure 8 As shown, in the width direction S2 of the second electrode region 12, the second insulating protective member 30 extends to the edge of the first electrode region 11 that is close to both sides of the second electrode region 12.

[0066] Preferably, the second insulating protective member 30 extends the width of the edge of the adjacent first electrode region 11 (e.g., Figure 8 The width D2 shown is 50μm to 100μm. For example, the width of the edge of the first electrode region 11 that the second insulating protective member 30 extends to can be 50μm, 60μm, 70μm, 80μm, 90μm or 100μm, etc. By designing the width of the edge of the first electrode region 11 that the second insulating protective member 30 extends to, the second insulating protective member 30 can simultaneously support the edge of the second electrode region 12 and the edge of the first electrode region 11, thereby improving the reliability of the second insulating protective member 30 in supporting the edge of the second electrode region 12 and the edge of the first electrode region 11.

[0067] The width of the first insulating protective member 20 and the width of the edge of the second electrode region 12 that the first insulating protective member 20 extends to, as well as the width of the edge of the first electrode region 11 that the second insulating protective member 30 extends to, are matched to improve the reliability of the overall support for the edges of the first electrode region 11 and the second electrode region 12. That is, the edges of the first electrode region 11 or the second electrode region 12 that are not covered by the second insulating protective member 30 and the first insulating protective member 20 will also be supported to prevent collapse.

[0068] Furthermore, in the width direction of the first electrode region 11, the ratio between the width of the first bus region 111 and the width of the first isolation region 112 is 1:(0.5 to 0.9). For example, the ratio of the width of the first bus region 111 to the width of the first isolation region 112 can be 1:0.5, 1:0.6, 1:0.7, 1:0.8, or 1:0.9, etc.

[0069] In the width direction of the second electrode region 12, the ratio between the width of the second bus region 121 and the width of the second isolation region 122 is 1:(0.5 to 0.9). For example, the ratio between the width of the second bus region 121 and the width of the second isolation region 122 may be 1:0.5, 1:0.6, 1:0.7, 1:0.8, or 1:0.9, etc.

[0070] Furthermore, such as Figures 7 to 10As shown, the aforementioned back-contact gridless solar cell may further include: a first electrical contact 40 disposed on the first busbar region 111, and a second electrical contact 50 disposed on the second busbar region 121. Preferably, the lines connecting the corresponding first electrical contacts 40 on the plurality of first electrode regions 11 coincide with the center line of the corresponding second insulating protective member 30; the lines connecting the corresponding second electrical contacts 50 on the plurality of second electrode regions 12 coincide with the center line of the corresponding first insulating protective member 20.

[0071] In the process of using the connection structure 80 to connect back-contact gridless solar cells or cells cut from back-contact gridless solar cells, the first electrical contact point 40 and the second electrical contact point 50 can be set to quickly position the connection structure 80 at the welding position, improving the connection efficiency while ensuring the protective effect of the first insulating protective component 20 and the second insulating protective component 30.

[0072] The structural constraint of aligning the connection of multiple first electrical contact points 40 with the center line of the second insulating protective element 30 and the connection of multiple second electrical contact points 50 with the center line of the first insulating protective element 20 helps to improve the protective effect of the first insulating protective element 20 and the second insulating protective element 30.

[0073] Furthermore, such as Figures 7 to 10 As shown, the back-contact gridless solar cell may further include: a first insulating positioning member 60 disposed on both sides of the first electrical contact point 40 on the first bus region 111; and a second insulating positioning member 70 disposed on both sides of the second electrical contact point 50 on the second bus region 121.

[0074] The first insulating positioning element 60 and the second insulating positioning element 70 can, on the one hand, further and accurately position the first electrical contact point 40 and the second electrical contact point 50 of the connecting structure 80. On the other hand, they can limit the displacement of the connecting structure 80, and also prevent the connecting structure 80 from shifting during the lamination process. In addition, the second insulating positioning element 70 cooperates with the first insulating protective element 20 to further stabilize the electrical connection between the connecting structure 80 and the fine grid segment corresponding to the second bus region 121 in the fine grid lines of the second electrode region 12. The first insulating positioning element 60 cooperates with the second insulating protective element 30 to further stabilize the electrical connection between the connecting structure 80 and the fine grid segment corresponding to the first bus region 111 in the fine grid lines of the first electrode region 11. This can prevent the connecting structure 80 from breaking and ensure stable and reliable electrical connection.

[0075] In addition, the first insulating positioning member 60 can protect the fine grid lines 14 on both sides of the first electrical contact point 40, and the second insulating positioning member 70 can protect the fine grid lines 14 on both sides of the second electrical contact point 50 and limit the displacement of the connection structure 80. The first insulating positioning member 60 cooperates with the first electrical contact point 40, and the second insulating positioning member 70 cooperates with the second electrical contact point 50, which can reduce the stress applied to the fine grid lines 14 by the connection structure 80 and effectively reduce the risk of grid line 14 breaking.

[0076] More specifically, the spacing between the first insulating positioning members 60 disposed on both sides of the first electrical contact point 40 is generally 0.5mm to 1.5mm. For example, the spacing between the first insulating positioning members 60 disposed on both sides of the first electrical contact point 40 can be 0.5mm, 0.8mm, 1.0mm, 1.2mm, or 1.5mm, etc. By limiting the spacing, the first insulating positioning members 60 disposed on both sides of the first electrical contact point 40 can better position the connection position of the connection structure 80 and can better fix the connection structure 80.

[0077] The distance between the second insulating positioning members 70 disposed on both sides of the second electrical contact 50 is 0.5mm to 1.5mm. For example, the distance between the second insulating positioning members 70 disposed on both sides of the second electrical contact 50 can be 0.5mm, 0.8mm, 1.0mm, 1.2mm or 1.5mm, etc. By limiting the distance, the second insulating positioning members 70 disposed on both sides of the second electrical contact 50 can better position the connection position of the connection structure 80 and can better fix the connection structure 80.

[0078] The height of the first insulating positioning member 60 is higher than the height of the second insulating protective member 30. Preferably, the height difference between the first insulating positioning member 60 and the second insulating protective member 30 is ( Figure 7 The ΔH shown can be 0.5μm to 100μm. For example, the height difference between the height of the first insulating positioning member 60 and the height of the second insulating protective member 30 can be 0.5μm, 1μm, 10μm, 20μm, 40μm, 50μm, 70μm, 90μm or 100μm, etc.

[0079] The height of the second insulating positioning member 70 is higher than the height of the first insulating protective member 20. Preferably, the height difference between the second insulating positioning member 70 and the first insulating protective member 20 can be 0.5μm to 100μm. For example, the height difference between the second insulating positioning member 70 and the first insulating protective member 20 can be 0.5μm, 1μm, 10μm, 20μm, 40μm, 50μm, 70μm, 90μm, or 100μm, etc.

[0080] By setting the height of the first insulating positioning component 60 to be higher than the height of the second insulating protective component 30 and the height of the second insulating positioning component 70 to be higher than the height of the first insulating protective component 20, the first insulating positioning component 60 and the second insulating positioning component 70 can be used to better position the connecting structure 80 to the first electrical contact point 40 or the second electrical contact point 50 during automated production, thereby improving positioning efficiency and positioning reliability.

[0081] In addition, the height of the first insulating positioning member 60 and the height of the second insulating protective member 30 can be the same, and the height of the second insulating positioning member 70 and the height of the first insulating protective member 20 can also be the same.

[0082] Furthermore, this embodiment of the invention also provides a photovoltaic module. The photovoltaic module may include: a back-contact gridless solar cell provided in any of the above embodiments, or back-contact gridless cells cut from a back-contact gridless solar cell provided in any of the above embodiments.

[0083] Additionally, the photovoltaic module may also include a connection structure 80. The connection structure 80 is used to connect the fine grid lines of the first electrode region 11 or the fine grid lines of the second electrode region 12 of the back-contact gridless solar cell or back-contact gridless cell. Specifically, as shown... Figure 10 The illustrated photovoltaic module shows a partial structure for connecting back-contact gridless solar cells or back-contact gridless cells in series. For each pair of adjacent back-contact gridless solar cells or back-contact gridless cells, in the extending direction of the connecting structure 80, a portion of the connecting structure 80 covers each of the second insulating protective members 30 of a back-contact gridless solar cell or back-contact gridless cell, and is electrically connected to the fine grid segments in the corresponding first busbar regions 111 of the plurality of first electrode regions 11 of the back-contact gridless solar cell or back-contact gridless cell. In the extending direction of the connecting structure 80, the fine grid segments connected by the connecting structure 80 are located in the plurality of... The first busbar region 111 and the multiple second insulating protective elements 30 covered by the connecting structure 80 correspond to each other. In the extending direction of the connecting structure 80, another part of the connecting structure 80 covers the multiple first insulating protective elements 20 of another adjacent back-contact gridless solar cell or back-contact gridless cell, and is electrically connected to the fine grid segment in the corresponding second busbar region 121 of the multiple second electrode regions 12 of the back-contact gridless solar cell or back-contact gridless cell. In the extending direction of the connecting structure 80, the multiple second busbar regions 121 where the fine grid segment connected by the connecting structure 80 is located correspond to the multiple first insulating protective elements 20 covered by the connecting structure 80. This achieves series connection between the various back-contact gridless solar cells or back-contact gridless cells.

[0084] Understandably, the back-contact gridless solar cells provided in any of the above embodiments, or the back-contact gridless solar cells cut from the back-contact gridless solar cells provided in any of the above embodiments, are connected in series to form a cell string. The cell strings are arranged in a specific layout to construct a cell array of a photovoltaic module. The photovoltaic module may also include a cover plate, an encapsulating film, and a back sheet. The encapsulating film is used to encapsulate the cell array between the cover plate and the back sheet.

[0085] The photovoltaic module provided in this embodiment uses a back-contact gridless solar cell. By widening the first busbar region 111 relative to the first isolation region 112 on both sides of the width direction of the first electrode region 11, and widening the second busbar region 121 relative to the second isolation region 122 on both sides of the width direction of the second electrode region 12, the force-bearing area of ​​the first busbar region 111 and the second busbar region 121 is increased. The first busbar region 111 corresponds to the second isolation region 122, and the second busbar region 121 corresponds to the first isolation region 112. Subsequently, the connection structure 80 is distributed between the first busbar region 111 and the second isolation region 122. During the lamination process, the first busbar region 111 and the second insulating protective member 30 disposed in the second isolation region 122 cooperate with each other. The second busbar region 121 and the first insulating protective member 20 disposed in the first isolation region 112 effectively reduce the pressure damage to the edges of the first electrode region 11 and the second electrode region 12. This can reduce or even avoid the risk of leakage and short circuit at the edges of the first electrode region 11 and the second electrode region 12, thereby effectively improving the efficiency of the back contact gridless solar cell and helping to improve the yield and reliability of the photovoltaic module made from the back contact gridless solar cell.

[0086] Furthermore, for the series connection between cells in a photovoltaic module or between back-contact gridless solar cells, multiple first insulating protective members 20 are spaced apart along the extension direction of the first electrode region 11 of the cell or back-contact gridless solar cell. Each first insulating protective member 20 covers and spans the first electrode region 11 and the isolation grooves 13 located on both sides of the first electrode region 11 in the width direction. A connection structure 80 connected to the fine grid lines of the second electrode region 12 is provided above the first insulating protective member 20 to connect the cell or back-contact gridless solar cell in series. Due to the presence of the first insulating protective member 20, the edge of the second electrode region can be supported, which can reduce or even avoid damage to the edge of the second electrode region. In addition, each The second insulating protective member 30 covers and spans the second electrode region 12 and the isolation grooves 13 located on both sides of the second electrode region 12 in the width direction. After the connection structure 80 connected to the fine grid lines of the first electrode region 11 is subsequently set above the second insulating protective member 30, the presence of the second insulating protective member 30 can support the edge of the first electrode region 11, reducing or even avoiding damage to the edge of the first electrode region 11. Therefore, the photovoltaic module provided by this utility model embodiment can reduce or even avoid the risk of leakage and short circuit at the edge of the first electrode region 11 and the edge of the second electrode region 12 of the included cells or back-contact gridless solar cells, thereby effectively improving the efficiency of the photovoltaic module and helping to improve the yield and reliability of the photovoltaic module.

[0087] Furthermore, a portion of the extending direction of the connecting structure 80 is electrically connected to the fine grid segment in the corresponding first busbar region 111 of each first electrode region 11 of a back-contact gridless solar cell or a back-contact gridless cell; another portion of the extending direction of the connecting structure 80 is electrically connected to the fine grid segment in the corresponding second busbar region 121 of each second electrode region 12 of another back-contact gridless solar cell or a back-contact gridless cell.

[0088] By widening the first busbar region 111 and the second busbar region 121, it is possible to better connect solar cells or back-contact gridless solar cells, thereby improving the reliability of photovoltaic modules.

[0089] Furthermore, this embodiment of the invention also provides a method for fabricating a back-contact gridless solar cell. For example... Figure 11 As shown, the fabrication method of this back-contact gridless solar cell may include:

[0090] Step 1101: Prepare alternating first electrode regions 11 and second electrode regions 12 on a main surface of a silicon substrate, and form isolation trenches 13 between adjacent first electrode regions 11 and second electrode regions 12.

[0091] The first electrode region 11 has alternating arrangements of a first bus region 111 and a first isolation region 112. On both sides of the width direction of the first electrode region 11, the first bus region 111 is wider than the first isolation region 112. The second electrode region 12 has alternating arrangements of a second bus region 121 and a second isolation region 122. On both sides of the width direction of the second electrode region 12, the second bus region 121 is wider than the second isolation region 122.

[0092] More specifically, each first electrode region 11 has two opposing first square wavy sides, wherein the peaks and troughs of the two first square wavy sides correspond to each other; the peaks and troughs of the first square wavy sides of each first electrode region 11 correspond to each other; the first confluence region 111 corresponds to the peak region of the first square wavy side; and the first isolation region 112 corresponds to the trough region of the first square wavy side. Each second electrode region 12 has two opposing second square wavy sides, wherein the peaks and troughs of the two second square wavy sides correspond to each other; the peaks and troughs of the second square wavy sides of each second electrode region 12 correspond to each other; the peak of the second square wavy side of the second electrode region 12 corresponds to the trough of the first square wavy side of the first electrode region 11, and the trough of the second square wavy side of the second electrode region 12 corresponds to the peak of the first square wavy side of the first electrode region 11; the second confluence region 121 corresponds to the peak region of the second square wavy side.

[0093] Step 1102: Lay the first insulating protective component 20 on the first isolation area 112.

[0094] Step 1103: Lay the second insulating protective component 30 on the second isolation area 122.

[0095] Specifically, each first insulating protective element 20 covers the first isolation area 112 and spans the isolation grooves 13 located on both sides of the width direction of the first isolation area 112; each second insulating protective element 30 covers the second isolation area 122 and spans the isolation grooves 13 located on both sides of the second isolation area 122.

[0096] More specifically, the first insulating protective element 20 corresponds to the trough region of the first square corrugated side surface; the second insulating protective element 30 corresponds to the trough region of the second square corrugated side surface.

[0097] The back-contact gridless solar cell prepared in this embodiment of the invention increases the force-bearing area of ​​the first and second busbar regions 111 and 121 by widening the first busbar region 111 relative to the first isolation region 112 on both sides of the width direction of the first electrode region 11, and by widening the second busbar region 121 relative to the second isolation region 122 on both sides of the width direction of the second electrode region 12. Furthermore, the first busbar region 111 corresponds to the second isolation region 122, and the second busbar region 121 corresponds to the first isolation region 112. Subsequently, the connection structure 80 is separately disposed in the first and second busbar regions 111 and 122. 121, and during the lamination process, the first busbar region 111 cooperates with the second insulating protective member 30 disposed in the second isolation region 122, and the second busbar region 121 cooperates with the first insulating protective member 20 disposed in the first isolation region 112, effectively reducing pressure damage to the edges of the first electrode region 11 and the edges of the second electrode region 12, thereby reducing or even avoiding the risk of leakage and short circuit at the edges of the first electrode region 11 and the edges of the second electrode region 12, thereby effectively improving the efficiency of the back contact gridless solar cell, and helping to improve the yield and reliability of the photovoltaic module prepared by the back contact gridless solar cell.

[0098] Furthermore, by widening the first busbar region 111 relative to the first isolation region 112 and widening the second busbar region 121 relative to the second isolation region 122, it is possible to ensure that the first busbar region 111 and the second busbar region 121 have relatively wide widths, which allows the connecting structure 80 to have a relatively large contact area with them. On the one hand, this can prevent the solder used for welding from flowing into the isolation groove 13; on the other hand, the cooperation between the first busbar region 111 and the second insulating protective component 30 and the cooperation between the second busbar region 121 and the first insulating protective component 20 can reduce the stress of the connecting structure 80 on the edges of the first electrode region 11 and the second electrode region 12, further reducing the risk of damage to the edges of the first electrode region 11 and the second electrode region 12.

[0099] Furthermore, the back-contact gridless solar cell prepared in this embodiment of the invention has multiple first insulating protective members 20 spaced apart in the extending direction S1 of each first electrode region 11. Each first insulating protective member 20 covers and spans the first electrode region 11 and the isolation grooves 13 located on both sides of the first electrode region 11 in the width direction S2. After a connection structure 80 connecting to the second electrode region 12 is subsequently provided above the first insulating protective member 20, the presence of the first insulating protective member 20 can support the edges of the second electrode region 12 and the first electrode region 11, reducing or even avoiding damage to the edges of the second electrode region 12 and the first electrode region 11. Additionally, each second insulating protective member 30 in the width direction of the second electrode region 12... S2 covers and spans the second electrode region 12 and the isolation groove 13 located on both sides of the second electrode region 12. After the connection structure 80 connected to the first electrode region 11 is subsequently set above the second insulating protective member 30, the presence of the second insulating protective member 30 can support the edges of the second electrode region 12 and the first electrode region 11, which can reduce or even avoid damage to the supporting edges of the second electrode region 12 and the first electrode region 11. Therefore, the back contact gridless solar cell provided by this utility model embodiment can reduce or even avoid the risk of leakage and short circuit at the edges of the first electrode region 11 and the second electrode region 12, thereby effectively improving the efficiency of the back contact gridless solar cell and helping to improve the yield and reliability of the photovoltaic module prepared by the back contact gridless solar cell.

[0100] Furthermore, such as Figure 11 As shown, the above preparation method may further include: step S1104: a first electrical contact point 40 is provided in the region of the first electrode region 11 corresponding to the second insulating protective member 30, and a second electrical contact point 50 is provided in the region of the second electrode region 12 corresponding to the first insulating protective member 20.

[0101] Furthermore, such as Figure 11 As shown, the above preparation method may further include: step S1105: laying a first insulating positioning element 60 on both sides of the first electrical contact point 40 on the first electrode region 11, and laying a second insulating positioning element 70 on both sides of the second electrical contact point 50 on the second electrode region 12.

[0102] The second insulating positioning member 70 and the first insulating positioning member 60 can accurately position the second electrical contact 50 and the first electrical contact 40, and prevent the connection structure 80 from shifting, thereby improving the series connection efficiency. On the other hand, the second insulating positioning member 70 and the first insulating positioning member 60 can better stabilize the fine grid lines 14 on both sides of the second electrical contact 50 and the first electrical contact 40, preventing grid breakage of the fine grid lines 14 on both sides of the second electrical contact 50 and the first electrical contact 40, and improving the reliability of the back contact solar cell.

[0103] The above steps are provided only to help understand the method, structure, and core idea of ​​this utility model. For those skilled in the art, various improvements and modifications can be made to this utility model without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.

Claims

1. A back contact, no master grid solar cell, characterized in that, include: The battery body (10) includes, on the back side, an alternately arranged first electrode region (11) and a second electrode region (12), and an isolation groove (13) disposed between adjacent first electrode regions (11) and second electrode regions (12). In the extending direction of each of the first electrode regions (11), a plurality of first insulating protective elements (20) are provided at intervals. In the extending direction of each second electrode region (12), a plurality of second insulating protective elements (30) are provided at intervals. The first electrode region (11) is alternately arranged with a first bus region (111) and a first isolation region (112). On both sides of the width direction of the first electrode region (11), the first bus region (111) is widened relative to the first isolation region (112). The first insulating protective member (20) is disposed in the first isolation region (112). The first bus region (111) of each first electrode region (11) corresponds to the first isolation region (112) of each first electrode region (11). The second electrode region (12) is alternately arranged with a second bus region (121) and a second isolation region (122). On both sides of the width direction of the second electrode region (12), the second bus region (121) is wider than the second isolation region (122). The second insulating protective member (30) is disposed in the second isolation region (122). The second bus region (121) of each second electrode region (12) corresponds to the second isolation region (122) of each second electrode region (12). In the width direction of the first electrode region (11) and the second electrode region (12), the first bus region (111) corresponds to the second isolation region (122), and the second bus region (121) corresponds to the first isolation region (112).

2. The back-contact gridless solar cell according to claim 1, characterized in that, The first insulating protective element (20) is disposed on the first isolation area (112) and does not extend beyond the edge of the first isolation area (112); the second insulating protective element (30) is disposed on the second isolation area (122) and does not extend beyond the edge of the second isolation area (122); or, The first insulating protective member (20) is disposed on the first isolation area (112) and extends to the adjacent isolation grooves (13) on both sides of the first isolation area (112); the second insulating protective member (30) is disposed on the second isolation area (122) and extends to the adjacent isolation grooves (13) on both sides of the second isolation area (122). or, The first insulating protective member (20) covers the first isolation area (112) and spans the isolation grooves (13) located on both sides of the width direction of the first isolation area (112), and extends to the edge of the second electrode area (12) it is close to; the second insulating protective member (30) covers the second isolation area (122) and spans the isolation grooves (13) located on both sides of the width direction of the second isolation area (122), and extends to the edge of the first electrode area (11) it is close to.

3. The back-contact gridless solar cell according to claim 2, characterized in that, The first insulating protective member (20) spans the isolation groove (13) located on both sides of the width direction of the first isolation area (112) and extends to the edge of the second electrode area (12) it is close to, and the width of the edge of the first insulating protective member (20) extending to the edge of the second electrode area (12) it is close to is 50μm~100μm; The second insulating protective member (30) spans the isolation groove (13) located on both sides of the width direction of the second isolation area (122) and extends to the edge of the first electrode area (11) it is close to, and the width of the edge of the second insulating protective member (30) extending to the edge of the first electrode area (11) it is close to is 50μm~100μm.

4. The back-contact gridless solar cell according to claim 1, characterized in that, Each of the first electrode regions (11) has two opposite first square wave-shaped sides, wherein the peaks and troughs of the two first square wave-shaped sides correspond to each other; The peaks and troughs of the first square wavy side surfaces of each of the first electrode regions (11) correspond to each other; The first confluence region (111) corresponds to the crest region of the first square wave side surface; The first isolation region (112) corresponds to the trough region of the first square wavy side surface; Each of the second electrode regions (12) has two opposite second square wavy sides, wherein the peaks and troughs of the two second square wavy sides correspond to each other; The peaks and troughs of the second square wavy side surfaces of each of the second electrode regions (12) correspond to each other; The peak of the second square wavy side of the second electrode region (12) corresponds to the trough of the first square wavy side of the first electrode region (11), and the trough of the second square wavy side of the second electrode region (12) corresponds to the peak of the first square wavy side of the first electrode region (11). The second confluence region (121) corresponds to the crest region of the second square wave side; The second insulating protective element (30) corresponds to the trough region of the second square wavy side.

5. The back-contact gridless solar cell according to any one of claims 1 to 4, characterized in that, In the width direction of the first electrode region (11), the ratio between the width of the first bus region (111) and the width of the first isolation region (112) is 1:(0.5~0.9). In the width direction of the second electrode region (12), the ratio between the width of the second bus region (121) and the width of the second isolation region (122) is 1:(0.5~0.9). And / or, The width of the isolation groove (13) is 100μm~900μm.

6. The back contact, gridless solar cell of claim 1, wherein, Also includes: The first electrical contact point (40) is disposed on the first bus region (111), and the first insulating positioning member (60) is disposed on both sides of the first electrical contact point (40). The second electrical contact (50) is disposed on the second bus region (121), and the second insulating positioning element (70) is disposed on both sides of the second electrical contact (50).

7. The back-contact gridless solar cell according to claim 6, characterized in that, The line connecting the corresponding first electrical contact points (40) on the multiple first electrode regions (11) coincides with the center line of the corresponding second insulating protective element (30); The lines connecting the corresponding second electrical contact points (50) on the multiple second electrode regions (12) coincide with the center line of the corresponding first insulating protective element (20).

8. The back-contact gridless solar cell according to claim 6 or 7, characterized in that, The height of the first insulating positioning member (60) is higher than the height of the second insulating protective member (30); The height of the second insulating positioning member (70) is higher than the height of the first insulating protective member (20).

9. The back-contact gridless solar cell according to claim 8, characterized in that, The height difference between the first insulating positioning element (60) and the second insulating protective element (30) is 5μm ~ 30μm; The height difference between the second insulating positioning element (70) and the first insulating protective element (20) is 5μm ~ 30μm.

10. A photovoltaic module, characterized by include: The back-contact gridless solar cell according to any one of claims 1 to 9 or the back-contact gridless solar cell cut from the back-contact gridless solar cell according to claims 1 to 9, and the connection structure (80). The connection structure (80) is used to connect the fine grid lines of the multiple first electrode regions (11) or the multiple second electrode regions (12) of the back-contact gridless solar cell or the back-contact gridless solar cell. For each pair of adjacent back-contact gridless solar cells or each pair of adjacent back-contact gridless solar cells, In the extending direction of the connection structure (80), a portion of the connection structure (80) covers a plurality of second insulating protective members (30) of a back-contact gridless solar cell or a back-contact gridless cell, and is electrically connected to the fine grid segment in the corresponding first bus region (111) of a plurality of first electrode regions (11) of the back-contact gridless solar cell or the back-contact gridless cell, wherein, in the extending direction of the connection structure (80), the plurality of first bus regions (111) where the fine grid segment connected by the connection structure (80) is located correspond to the plurality of second insulating protective members (30) covered by the connection structure (80); In the extending direction of the connection structure (80), another part of the connection structure (80) covers over the plurality of first insulating protective elements (20) of another adjacent back-contact gridless solar cell or back-contact gridless cell, and is electrically connected to the fine grid segment in the corresponding second bus region (121) of the plurality of second electrode regions (12) of the back-contact gridless solar cell or back-contact gridless cell, wherein, in the extending direction of the connection structure (80), the plurality of second bus regions (121) where the fine grid segment connected by the connection structure (80) is located correspond to the plurality of first insulating protective elements (20) covered by the connection structure (80).

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