Solar cell and photovoltaic module

Abstract

The present application discloses a solar cell and a photovoltaic module. The solar cell comprises a cell substrate and an insulator. Conductive layers and collector electrodes are provided on the back surface of the cell substrate, an isolation trench is formed between each first conductive layer and an adjacent second conductive layer, first collector electrodes are provided with first connection portions, and second collector electrodes are provided with second connection portions. The insulator comprises first insulating portions and second insulating portions; the first insulating portions are arranged on the first conductive layers at positions corresponding to the second connection portions and on the second conductive layers at positions corresponding to the first connection portions, respectively; in a second direction, the second insulating portions are arranged on two sides of the first insulating portions; and the second insulating portions cover the isolation trenches between the first conductive layers and the second conductive layers, and / or, the second insulating portions cover the conductive layers and the collector electrodes on two sides of the first insulating portions in the second direction. The second insulating portions are used to form insulating isolation between the first conductive layers and the second conductive layers in a connection area of non-electrical connectors, thereby reducing the risk of short circuit in the solar cell.

Description

Solar cell and photovoltaic module

[0001] The present application claims priority to the Chinese patent application No. 202421724193.0, filed on July 19, 2024, entitled "Solar cell and photovoltaic module", and the Chinese patent application No. 202411457412.8, filed on October 17, 2024, entitled "Solar cell and photovoltaic module", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application belongs to the technical field of photovoltaics, and particularly relates to a solar cell and a photovoltaic module. BACKGROUND

[0003] In the existing back contact cell, a first semiconductor layer and a second semiconductor layer are arranged alternately on the back surface of a silicon substrate, and the first semiconductor layer and the second semiconductor layer are partially overlapped or interlaced. A laser or etching process is usually used to etch the overlapped or interlaced part of the first semiconductor layer and the second semiconductor layer to form an isolation groove, so as to insulate the first semiconductor layer and the second semiconductor layer.

[0004] However, during the subsequent soldering process, when conductive foreign matter such as tin slag falls between the two semiconductor layers, it will cause the first semiconductor layer and the second semiconductor layer to conduct, thereby causing the problem of electric leakage.

[0005] SUMMARY

[0006] The present application aims to provide a solar cell and a photovoltaic module, which can solve the problem that in the existing cell, conductive foreign matter such as tin slag generated by the soldering process is easy to fall between the two semiconductor layers, causing the cell to leak electricity.

[0007] In order to solve the above technical problems, the present application is implemented as follows:

[0008] In a first aspect, the embodiments of the present application provide a solar cell, comprising: a cell substrate, a conductive layer and a current collecting electrode are arranged on the back surface of the cell substrate, the conductive layer comprises a first conductive layer and a second conductive layer which are arranged alternately along a first direction and have opposite conductive types, an isolation groove is arranged between adjacent first conductive layer and second conductive layer, the current collecting electrode comprises a first current collecting electrode arranged on the first conductive layer and a second current collecting electrode arranged on the second conductive layer, the first current collecting electrode is provided with a first connecting part, and the second current collecting electrode is provided with a second connecting part.

[0009] The insulating piece comprises a first insulating part and a second insulating part, the first conductive layer is provided with the first insulating part at a position corresponding to the second connecting part, and the second conductive layer is provided with the first insulating part at a position corresponding to the first connecting part;

[0010] In the second direction intersecting the first direction, the second insulating part is arranged on both sides of the first insulating part, the second insulating part covers the isolation groove between the first conductive layer and the second conductive layer, and the second insulating part protrudes from the first insulating part in the second direction, and / or the second insulating part covers the conductive layers and the current collecting electrodes on both sides of the first insulating part in the second direction.

[0011] Optionally, the second insulating part covers the isolation groove between the first conductive layer and the second conductive layer, and the second insulating part extends in the first direction to cover at least part of the exposed first conductive layer, and / or the second insulating part extends in the first direction to cover at least part of the exposed second conductive layer.

[0012] Optionally, in the first direction, the width of the second insulating part is D11, the width of the isolation groove is W1, and the distance between adjacent first current collecting electrodes and second current collecting electrodes is H1, satisfying: W1-20 μm≤D11≤H1.

[0013] Optionally, when the second insulating part covers the isolation groove, in the second direction, the length of the second insulating part is L, satisfying: 2.5 mm≤L≤10 mm; and / or,

[0014] In the second direction, the length of the second insulating part between adjacent first connecting parts and second connecting parts accounts for 30%-95% of the shortest distance between the adjacent first connecting parts and the second connecting parts.

[0015] Optionally, the second insulating part covers the conductive layers and the current collecting electrodes on both sides of the first insulating part in the first direction, and the second insulating part extends in the first direction to cover the side wall of the conductive layer adjacent to the isolation groove.

[0016] Optionally, the second insulating part extends in the first direction to cover adjacent isolation grooves.

[0017] Optionally, the second insulating part extends in the first direction to cover adjacent conductive layers of another opposite conductive type.

[0018] Optionally, in the first direction, the width of the second insulating part is D12, the width of the second conductive layer is W2, and the distance between adjacent first current collecting electrodes is H2, satisfying: W2-20 μm≤D12≤H2;

[0019] Or, the width of the first conductive layer is W3, the interval between two adjacent second current collecting electrodes is H3, and W3-20 μm≤D12≤H3 is satisfied.

[0020] Optionally, the second insulating part on the first conductive layer and the second insulating part on the adjacent second conductive layer are at least partially connected in the first direction.

[0021] Or, the second insulating part on the first conductive layer and the second insulating part on the adjacent second conductive layer are at least partially connected in the second direction.

[0022] Or, there is a gap between the second insulating part on the first conductive layer and the second insulating part on the adjacent second conductive layer.

[0023] Optionally, along the second direction, the width of the first insulating part on the second conductive layer is greater than the width of the first connecting part.

[0024] And / or, along the second direction, the width of the first insulating part on the first conductive layer is greater than the width of the second connecting part.

[0025] Optionally, when the second insulating part covers the conductive layer and the current collecting electrode on both sides of the first insulating part in the first direction, the width of the second insulating part on the first conductive layer and the second insulating part on the second conductive layer in the first direction is not equal.

[0026] Optionally, the first insulating part covers the isolation groove, or the first insulating part covers the isolation groove and the exposed conductive layer adjacent to the isolation groove.

[0027] Optionally, the current collecting electrode is a silver electrode, a copper electrode, an alloy electrode or a multi-layer metal electrode.

[0028] In a second aspect, the embodiments of the present application provide a photovoltaic module, comprising: a solar cell as described above.

[0029] Optionally, the photovoltaic module further comprises an electrical connector, and the solar cell is provided as a plurality of solar cells, and the electrical connector is electrically connected to the connecting part of the current collecting electrode of the solar cell.

[0030] Optionally, a main grid is arranged between the electrical connector and the connecting part.

[0031] In the embodiments of the present application, the back surface of the battery substrate is provided with first conductive layers and second conductive layers of opposite electric types and arranged alternately in intervals, and a first insulating part is arranged on the first conductive layers and the second conductive layers, so that when the first current collecting electrode or the second current collecting electrode is connected in series by using the electric connecting piece, the first insulating part can play a role of insulating isolation between the electric connecting piece and the opposite conductive layer or the current collecting electrode. Meanwhile, a second insulating part is arranged on both sides of the first insulating part, so that the second insulating part covers the isolation groove between the first conductive layer and the second conductive layer, and / or so that the second insulating part covers the conductive layer and the current collecting electrode on both sides of the first insulating part. In this way, the second insulating part can play a role of insulating isolation between the first conductive layer and the second conductive layer in the non-electric connecting piece connecting area, so as to avoid the conduction between the first conductive layer and the second conductive layer through the conductive foreign matter such as welding slag, thereby reducing the risk of short circuit of the solar cell.

[0032] Additional aspects and advantages of the present application will be made apparent from the following description.

[0033] The present application aims to provide a solar cell and a photovoltaic module, which can solve the problem that the conductive foreign matter such as tin slag generated by the welding process easily falls between the two semiconductor layers in the existing battery, causing the battery to leak.

[0034] In order to solve the above technical problems, the present application is implemented as follows:

[0035] In a third aspect, the embodiments of the present application provide a solar cell, comprising: a battery substrate, the back surface of the battery substrate is provided with a conductive layer and a current collecting electrode, the conductive layer comprises first conductive layers and second conductive layers of opposite electric types and arranged alternately along a first direction, an isolation area is arranged between adjacent first conductive layers and second conductive layers, the current collecting electrode comprises a first current collecting electrode arranged on the first conductive layer and a second current collecting electrode arranged on the second conductive layer, the first current collecting electrode is provided with a first connecting part, and the second current collecting electrode is provided with a second connecting part;

[0036] An insulating part comprises a first insulating part and a second insulating part, the first conductive layer is provided with the first insulating part at a position corresponding to the second connecting part, and the second conductive layer is provided with the first insulating part at a position corresponding to the first connecting part;

[0037] The second insulating part is arranged on both sides of the first insulating part along a second direction, the second direction intersects the first direction, and the second insulating part covers the conductive layer and the current collecting electrode on both sides of the first insulating part along the second direction.

[0038] In a fourth aspect, the embodiments of the present application provide a solar cell, comprising:

[0039] A battery base body, a back surface of the battery base body is provided with a conductive layer and a current collecting electrode, the conductive layer comprises a first conductive layer and a second conductive layer which are arranged alternately in a first direction and have opposite conductive types, an isolation area is arranged between adjacent first conductive layer and second conductive layer, the current collecting electrode comprises a first current collecting electrode arranged on the first conductive layer and a second current collecting electrode arranged on the second conductive layer, the first current collecting electrode is provided with a first connecting part, and the second current collecting electrode is provided with a second connecting part;

[0040] An insulating part, comprising a first insulating part and a second insulating part, the first conductive layer is provided with the first insulating part at a position corresponding to the second connecting part, and the second conductive layer is provided with the first insulating part at a position corresponding to the first connecting part;

[0041] The second insulating part is arranged on both sides of the first insulating part in a second direction, the second direction intersects the first direction, the second insulating part covers the isolation area between the first conductive layer and the second conductive layer, and the second insulating part protrudes the first insulating part in the second direction.

[0042] In the fifth aspect, the embodiments of the present application provide a photovoltaic module, comprising the solar cell of any one of the above.

[0043] In the embodiments of the present application, the back surface of the battery base body is provided with the first conductive layer and the second conductive layer which are arranged alternately and have opposite conductive types, and the first insulating part is arranged on the first conductive layer and the second conductive layer, so that when the first current collecting electrode or the second current collecting electrode is connected in series by the electric connecting part, the first insulating part can insulate and isolate the electric connecting part from the opposite conductive layer and the current collecting electrode. Meanwhile, the second insulating part is arranged on both sides of the first insulating part, the second insulating part covers the isolation area between the first conductive layer and the second conductive layer, and / or the second insulating part covers the conductive layer and the current collecting electrode on both sides of the first insulating part. In this way, the second insulating part can insulate and isolate the first conductive layer and the second conductive layer in the non-electric connecting part connecting area, so as to avoid the conduction between the first conductive layer and the second conductive layer through the conductive foreign matter such as welding slag, thereby reducing the risk of short circuit of the solar cell.

[0044] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0045] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, including the accompanying drawings, in which:

[0046] FIG. 1 is a schematic diagram of a solar cell according to an embodiment of the present application;

[0047] Fig. 2 is a sectional view along line A-A in Fig. 1;

[0048] Fig. 3 is a schematic view of another solar cell according to an embodiment of the present application;

[0049] Fig. 4 is a sectional view along line B-B in Fig. 3;

[0050] Fig. 5 is a sectional view along line C-C in Fig. 3;

[0051] Fig. 6 is a schematic view of still another solar cell according to an embodiment of the present application;

[0052] Fig. 7 is a sectional view along line D-D in Fig. 3;

[0053] Fig. 8 is a sectional view along line E-E in Fig. 3;

[0054] Fig. 9 is a schematic view of a solar cell according to an embodiment of the present application;

[0055] Fig. 10 is a sectional view along line Al-Al in Fig. 9;

[0056] Fig. 11 is a schematic view of another solar cell according to an embodiment of the present application;

[0057] Fig. 12 is a sectional view along line Bl-Bl in Fig. 11;

[0058] Fig. 13 is a sectional view along line Cl-Cl in Fig. 11;

[0059] Fig. 14 is a schematic view of still another solar cell according to an embodiment of the present application;

[0060] Fig. 15 is a sectional view along line Dl-Dl in Fig. 14;

[0061] Fig. 16 is a sectional view along line El-El in Fig. 14.

[0062] Reference numerals:

[0063] Figs. 1-8: 10: cell substrate; 11a: first semiconductor region; 11: first conductive layer; 12a: second semiconductor region; 12: second conductive layer; 13: separation groove; 14: first current collecting electrode; 14a: first busbar; 15: second current collecting electrode; 15a: second busbar; 16: first main grid; 17: second main grid; 20: insulating member; 21: first insulating portion; 22: second insulating portion; 40: texturing layer; 50: anti-reflection layer; X: first direction; Y: second direction.

[0064] Fig. 9-Fig. 16: 10: battery substrate; 11a: first semiconductor region; 11: first conductive layer; 12a: second semiconductor region; 12: second conductive layer; 131: isolation region; 14: first current collecting electrode; 14a: first busbar; 15: second current collecting electrode; 15a: second busbar; 161: first busbar; 171: second busbar; 20: insulating member; 21: first insulating portion; 22: second insulating portion; 40: textured layer; 50: anti-reflection layer; X: first direction; Y: second direction. Specific embodiments

[0065] Embodiments of the present application will be described in detail below with reference to drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to drawings are exemplary only, and are for the purpose of explanation only, and are not to be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work under the premise that the scope of protection of the present application.

[0066] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in a "or" relationship.

[0067] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0068] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0069] The solar cell and the photovoltaic module provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings, specific embodiments and application scenarios thereof.

[0070] As shown in FIGS. 1-7, a solar cell according to an embodiment of the present application comprises a cell substrate 10 and an insulating member 20. The back surface of the cell substrate 10 is provided with a conductive layer and a current collecting electrode. The conductive layer comprises first conductive layers 11 and second conductive layers 12 which are oppositely conductive and alternately arranged along a first direction X. An isolation groove 13 is arranged between adjacent first conductive layers 11 and second conductive layers 12. The current collecting electrode comprises first current collecting electrodes 14 arranged on the first conductive layers 11 and second current collecting electrodes 15 arranged on the second conductive layers 12. The first current collecting electrodes 14 are provided with first connecting portions 14a, and the second current collecting electrodes 15 are provided with second connecting portions 15a.

[0071] Further, the insulating member 20 comprises first insulating portions 21 and second insulating portions 22. The first conductive layers 11 are provided with the first insulating portions 21 at positions corresponding to the second connecting portions 15a, and the second conductive layers 12 are provided with the first insulating portions 21 at positions corresponding to the first connecting portions 14a. The second insulating portions 22 are arranged on both sides of the first insulating portions 21 along a second direction Y which intersects the first direction X. The second insulating portions 22 cover the isolation grooves 13 between the first conductive layers 11 and the second conductive layers 12 and protrude the first insulating portions 21 in the second direction Y, and / or the second insulating portions 22 cover the conductive layers and the current collecting electrodes on both sides of the first insulating portions 21 along the second direction Y.

[0072] In the embodiments of the present application, the back surface of the cell substrate 10 is provided with the first conductive layers 11 and the second conductive layers 12 which are oppositely conductive and alternately arranged at intervals. Further, the first insulating portions 21 are arranged on the first conductive layers 11 and the second conductive layers 12, so that when the first current collecting electrodes 14 or the second current collecting electrodes 15 are connected in series by an electrical connecting member, the first insulating portions 21 can insulate and separate the electrical connecting member from the oppositely conductive layers or the current collecting electrodes. Meanwhile, the second insulating portions 22 are arranged on both sides of the first insulating portions 21, so that the second insulating portions 22 cover the isolation grooves 13 between the first conductive layers 11 and the second conductive layers 12, and / or the second insulating portions 22 cover the conductive layers and the current collecting electrodes on both sides of the first insulating portions 21. In this way, the second insulating portions 22 can insulate and separate the first conductive layers 11 and the second conductive layers 12 in the non-electrical connecting member connecting area, so as to avoid the conduction between the first conductive layers 11 and the second conductive layers 12 through conductive foreign matters such as welding slag, thereby reducing the risk of short circuit of the solar cell.

[0073] Specifically, as shown in FIG. 1, the solar cell includes a cell substrate 10 having opposite front and back surfaces, the front surface being a surface for receiving sunlight, and the front surface of the cell substrate 10 can be provided with a textured layer 40 and an anti-reflection layer 50 to improve the light absorption rate of the front surface of the cell substrate 10. The back surface of the cell substrate 10 has intersecting first and second directions X and Y, and the back surface of the cell substrate 10 is provided with first and second conductive layers 11 and 12 arranged alternately along the first direction X, and an isolation groove 13 is provided between adjacent first and second conductive layers 11 and 12 to separate the first and second conductive layers 11 and 12.

[0074] The first conductive layer 11 is provided with a first current collecting electrode 14 extending along the second direction Y, and the second conductive layer 12 is provided with a second current collecting electrode 15 extending along the second direction Y. Along the second direction Y, the first current collecting electrode 14 is provided with a plurality of first connecting portions 14a arranged at intervals, and the second current collecting electrode 15 is provided with a plurality of second connecting portions 15a arranged at intervals, and the projections of the first and second connecting portions 14a and 15a on a plane perpendicular to the first direction X do not coincide.

[0075] Furthermore, the first connecting portions 14a of a plurality of first current collecting electrodes 14 can be simultaneously electrically connected by an electrical connecting member along the first direction X to achieve current convergence of the plurality of first current collecting electrodes 14, and the second connecting portions 15a of a plurality of second current collecting electrodes 15 can be simultaneously electrically connected by an electrical connecting member along the first direction X to achieve current convergence of the plurality of second current collecting electrodes 15.

[0076] The electrical connecting member connected to the first connecting portion 14a is a first electrical connecting member, and a first insulating portion 21 is required to be used for insulation and isolation between the first electrical connecting member and the second conductive layer 12 and the second current collecting electrode 15 to avoid short circuiting between the first electrical connecting member and the second conductive layer 12 and the second current collecting electrode 15. Correspondingly, the electrical connecting member connected to the second connecting portion 15a is a second electrical connecting member, and a first insulating portion 21 is required to be used for insulation and isolation between the second electrical connecting member and the first conductive layer 11 and the first current collecting electrode 14 to avoid short circuiting between the second electrical connecting member and the first conductive layer 11 and the first current collecting electrode 14.

[0077] It should be noted that the solar cell in the present application can be a solar cell with a main grid or a solar cell without a main grid. In the solar cell with a main grid, the electrical connecting member refers to a main grid line or a bus electrode; in the solar cell without a main grid, the electrical connecting member refers to a solder strip, a bus bar, or the like.

[0078] It can be understood that, in the working process of the solar cell, the carriers generated by the conversion of the cell substrate 10 can be collected through the first and second current collecting electrodes 14 and 15. Furthermore, by connecting the first and second current collecting electrodes 14 and 15 in series through the electrical connectors, the carriers collected by each current collecting electrode can be converged and led out of the solar cell.

[0079] In some embodiments, as shown in FIGS. 1 and 3, the second insulating part 22 is arranged on both sides of the first insulating part 21 along the second direction Y, that is, the second insulating part 22 is arranged on both sides of the first insulating part 21 in FIGS. 1 and 3, and the dashed line represents the boundary position of the first insulating part 21 and the second insulating part 22. Furthermore, the second insulating part 22 covers the isolation groove 13 between the first and second conductive layers 11 and 12, so as to insulate and separate the first and second conductive layers 11 and 12 on both sides of the isolation groove 13, thereby avoiding the conductive impurities such as welding slag from falling into the isolation groove 13 and causing the conduction between the first and second conductive layers 11 and 12 in the subsequent processing process.

[0080] In some embodiments, as shown in FIGS. 1 and 3, the second insulating part 22 is arranged on both sides of the first insulating part 21 along the second direction Y, that is, the second insulating part 22 is arranged on both sides of the first insulating part 21 in FIGS. 1 and 3, and the dashed line represents the boundary position of the first insulating part 21 and the second insulating part 22. Furthermore, the second insulating part 22 covers the isolation groove 13 between the first and second conductive layers 11 and 12, so as to insulate and separate the first and second conductive layers 11 and 12 on both sides of the isolation groove 13, thereby avoiding the conductive impurities such as welding slag from falling into the isolation groove 13 and causing the conduction between the first and second conductive layers 11 and 12 in the subsequent processing process.

[0081] It can be understood that the corresponding position of the first conductive layer 11 and the second current collecting electrode 15a refers to the region on the first conductive layer 11 where the orthographic projection of the second current collecting electrode 15a in the first direction X at least partially overlaps; and the corresponding position of the second conductive layer 12 and the first current collecting electrode 14a refers to the region on the second conductive layer 12 where the orthographic projection of the first current collecting electrode 14a in the first direction X at least partially overlaps.

[0082] In some embodiments, the current collecting electrode can be made of a metal conductive material, for example, the current collecting electrode can be a silver electrode, a copper electrode, an alloy electrode, or a multi-layer metal electrode, etc. Of course, the current collecting electrode can also be made of other materials, which can be flexibly set according to the actual situation, and the present application does not make any limitation here.

[0083] It can be understood that, in the solar cell, the current collecting electrode forms an ohmic connection with the cell substrate 10, and the current collecting electrode is made of a metal conductive material with good conductivity, which can improve the ability of the current collecting electrode to collect carriers.

[0084] Optionally, as shown in FIGS. 1-5, the second insulating part 22 covers the isolation groove 13 between the first conductive layer 11 and the second conductive layer 12, and the second insulating part 22 extends in the first direction X to cover at least part of the exposed first conductive layer 11 and / or the exposed second conductive layer 12.

[0085] In the embodiments of the present application, in the case where the second insulating part 22 covers the isolation groove 13 between the first conductive layer 11 and the second conductive layer 12, the second insulating part 22 extends in the first direction X to the first conductive layer 11 and / or the second conductive layer 12 on both sides of the isolation groove 13, so as to cover at least part of the exposed first conductive layer 11 and / or the exposed second conductive layer 12 by the second insulating part 22. In this way, the insulating isolation effect of the second insulating part 22 between the first conductive layer 11 and the second conductive layer 12 can be improved, so as to further reduce the risk of short circuit between the first conductive layer 11 and the second conductive layer 12.

[0086] Optionally, as shown in FIG. 4, along the first direction X, the width of the second insulating part 22 is D11, the width of the isolation groove 13 is W1, and the distance between the adjacent first current collecting electrode 14 and the second current collecting electrode 15 is H1, which satisfies: W1-20μm≤D11≤H1.

[0087] In the embodiments of the present application, in the case where the second insulating part 22 covers the isolation groove 13 between the first conductive layer 11 and the second conductive layer 12, the width D11 of the second insulating part 22 is set to be greater than or equal to W1-20μm, so as to cover the isolation groove 13 by the second insulating part 22, thereby avoiding the conductive foreign matter such as welding slag from falling into the isolation groove 13 to cause the short circuit between the first conductive layer 11 and the second conductive layer 12 on both sides of the isolation groove 13, and meanwhile allowing the second insulating part 22 to cover most of the width of the isolation groove 13 under certain process error. Meanwhile, the width D11 of the second insulating part 22 is set to be less than or equal to the distance H1 between the adjacent first current collecting electrode 14 and the second current collecting electrode 15, thereby taking into account the isolation effect of the second insulating part 22 and the manufacturing cost without affecting the series connection of the current collecting electrodes.

[0088] Optionally, as shown in FIG. 3, in the case where the second insulating part 22 covers the isolation groove 13, along the second direction Y, the length of the second insulating part 22 is L, which satisfies: 2.5mm≤L≤10mm. Specifically, the length L of the second insulating part 22 can be set to be: 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, or any value or range between any two values.

[0089] In the embodiments of the present application, by setting the reasonable range of the length L of the second insulation part 22 along the second direction Y, it is ensured that the effective insulation isolation effect can be formed between the adjacent first conductive layer 11 and the second conductive layer 12 by using the second insulation part 22, and the waste caused by the too long second insulation part 22 is avoided.

[0090] Optionally, along the second direction Y, the length of the second insulation part 22 between the adjacent first connecting part 14a and the second connecting part 15a accounts for 30%-95% of the shortest distance between the adjacent first connecting part 14a and the second connecting part 15a. Specifically, the ratio of the length of the second insulation part 22 to the shortest distance between the adjacent first connecting part 14a and the second connecting part 15a can be set to be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or any other value or a range between any two values.

[0091] In the embodiments of the present application, by setting the range of the ratio of the length of the second insulation part 22 to the shortest distance between the adjacent first connecting part 14a and the second connecting part 15a, the effective insulation isolation effect of the second insulation part 22 on the region between the adjacent first connecting part 14a and the second connecting part 15a is ensured, and the preparation cost of the second insulation part 22 is saved.

[0092] Optionally, as shown in FIG. 6, the second insulation part 22 covers the conductive layer and the current collecting electrode on both sides of the first insulation part 21 along the first direction X, and the second insulation part 22 extends to cover the side wall of the conductive layer adjacent to the isolation groove 13 in the first direction X.

[0093] In the embodiments of the present application, in the case where the second insulation part 22 covers the conductive layer and the current collecting electrode on both sides of the first insulation part 21 along the second direction Y, the second insulation part 22 extends to cover the side wall of the conductive layer adjacent to the isolation groove 13 in the first direction X, so as to increase the area covered by the second insulation part 22 on the conductive layer, which helps to improve the insulation isolation effect of the second insulation part 22 and further reduce the risk of short circuit between the first conductive layer 11 and the second conductive layer 12.

[0094] In some embodiments, the first insulation part 21 on the first conductive layer 11 is provided with a second insulation part 22 on both sides, the second insulation part 22 covers the first conductive layer 11 and the first current collecting electrode 14 on both sides of the first insulation part 21, and the second insulation part 22 extends to cover the side wall of the first conductive layer 11 adjacent to the isolation groove 13 in the first direction X.

[0095] In some embodiments, the second insulating portion 22 is arranged on both sides of the first insulating portion 21 on the second conductive layer 12, and covers the second conductive layer 12 and the second current collecting electrode 15 on both sides of the first insulating portion 21, and extends in the first direction X to cover the side wall of the adjacent isolation groove 13.

[0096] Optionally, as shown in FIG. 7 and FIG. 8, the second insulating portion 22 extends in the first direction X to cover the adjacent isolation groove 13.

[0097] In the embodiments of the present application, in the case where the second insulating portion 22 covers the conductive layer and the current collecting electrode on both sides of the first insulating portion 21 along the second direction Y, the second insulating portion 22 extends in the first direction X to cover the adjacent isolation groove 13, so that the second insulating portion 22 simultaneously forms insulating isolation for the conductive layer and the adjacent isolation groove 13, which can further improve the insulating isolation of the second insulating portion 22, thereby reducing the risk of short circuit between the first conductive layer 11 and the second conductive layer 12.

[0098] Optionally, the second insulating portion 22 extends in the first direction X to cover the adjacent conductive layer of the opposite conductive type.

[0099] In the embodiments of the present application, in the case where the second insulating portion 22 covers the conductive layer and the current collecting electrode on both sides of the first insulating portion 21 along the second direction Y, the second insulating portion 22 extends in the first direction X to cover the adjacent conductive layer of the opposite conductive type. In this way, the coverage area of the second insulating portion 22 can be increased, thereby improving the insulating isolation of the second insulating portion 22 between the first conductive layer 11 and the second conductive layer 12, and the risk of short circuit between the first conductive layer 11 and the second conductive layer 12 due to conductive foreign matters such as welding slag can be reduced.

[0100] In the embodiments of the present application, in the case where the second insulating portion 22 covers the conductive layer and the current collecting electrode on both sides of the first insulating portion 21 along the second direction Y, the second insulating portion 22 extends in the first direction X to cover the adjacent conductive layer of the opposite conductive type. In this way, the coverage area of the second insulating portion 22 can be increased, thereby improving the insulating isolation of the second insulating portion 22 between the first conductive layer 11 and the second conductive layer 12, and the risk of short circuit between the first conductive layer 11 and the second conductive layer 12 due to conductive foreign matters such as welding slag can be reduced.

[0101] Optionally, as shown in FIG. 7, along the first direction X, the width of the second insulating portion 22 is D12, the width of the second conductive layer 12 is W2, and the spacing between the adjacent two first current collecting electrodes 14 is H2, which satisfies: W2-20 μm≤D12≤H2.

[0102] In the embodiments of the present application, the width D12 of the second insulating portion 22 is greater than or equal to W2-20 μm, so that the second insulating portion 22 at least partially covers the second conductive layer 12, and the surface of the second conductive layer 12 is shielded and isolated by the second insulating portion 22, thereby avoiding the conduction of the adjacent first conductive layer 11 and the second conductive layer 12 due to the conductive foreign matter such as welding slag. At the same time, the width D12 of the second insulating portion 22 is less than or equal to the interval H2 between the adjacent two first current collecting electrodes 14, so that the area between the adjacent two first current collecting electrodes 14 is shielded and covered by the second insulating portion 22.

[0103] Optionally, as shown in FIG. 8, the width of the first conductive layer 11 is W3, the interval between the adjacent two second current collecting electrodes 15 is H3, and the following condition is satisfied: W3-20 μm≤D12≤H3.

[0104] In the embodiments of the present application, the width D12 of the second insulating portion 22 is greater than or equal to W3-20 μm, so that the second insulating portion 22 at least partially covers the first conductive layer 11, and the surface of the first conductive layer 11 is shielded and isolated by the second insulating portion 22, thereby avoiding the conduction of the adjacent first conductive layer 11 and the second conductive layer 12 due to the conductive foreign matter such as welding slag. At the same time, the width D12 of the second insulating portion 22 is less than or equal to the interval H3 between the adjacent two second current collecting electrodes 15, so that the area between the adjacent two first current collecting electrodes 14 is shielded and covered by the second insulating portion 22.

[0105] In some embodiments, as shown in FIGS. 1, 3 and 6, the second insulating portion 22 on the first conductive layer 11 is at least partially connected with the second insulating portion 22 on the adjacent second conductive layer 12 in the first direction X. In this way, the continuity between the second insulating portion 22 on the first conductive layer 11 and the second insulating portion 22 on the adjacent second conductive layer 12 in the first direction X is ensured, and the insulation and isolation of the second insulating portion 22 in the first direction X between the first conductive layer 11 and the second conductive layer 12 is ensured.

[0106] In some embodiments, as shown in FIGS. 1, 3 and 6, the second insulating portion 22 on the first conductive layer 11 is at least partially connected with the second insulating portion 22 on the adjacent second conductive layer 12 in the second direction Y. In this way, the continuity between the second insulating portion 22 on the first conductive layer 11 and the second insulating portion 22 on the adjacent second conductive layer 12 in the second direction Y is ensured, and the insulation and isolation of the second insulating portion 22 in the second direction Y between the first conductive layer 11 and the second conductive layer 12 is ensured.

[0107] In some embodiments, a gap (not shown in the figure) exists between the second insulating portion 22 on the first conductive layer 11 and the second insulating portion 22 on the adjacent second conductive layer 12. In this way, the amount of material used to manufacture the second insulating portion 22 can be appropriately saved, and the production cost can be reduced, while ensuring that the insulation isolation between the first conductive layer 11 and the second conductive layer 12 is formed by the second insulating portion 22.

[0108] In some embodiments, as shown in FIG. 1, the width of the first insulating portion 21 on the second conductive layer 12 is greater than the width of the first connecting portion 14a in the second direction Y, and / or the width of the first insulating portion 21 on the first conductive layer 11 is greater than the width of the second connecting portion 15a in the second direction Y.

[0109] It can be understood that when the first connecting portions 14a of the plurality of first current collecting electrodes 14 are connected in series by the electrical connection, or the second connecting portions 15a of the plurality of second current collecting electrodes 15 are connected in series by the electrical connection, the position of the electrical connection may

[0110] Optionally, as shown in FIG. 6, when the second insulating portion 22 covers the conductive layer and the current collecting electrode on both sides of the first insulating portion 21 in the first direction X, the width of the second insulating portion 22 on the first conductive layer 11 and the second insulating portion 22 on the second conductive layer 12 in the first direction X is not equal.

[0111] It can be understood that the structure design of the solar cell requires that the width of the first conductive layer 11 and the second conductive layer 12 in the first direction X is different, and then the width of the corresponding second insulating portion 22 is reasonably set according to the width of the first conductive layer 11 and the second conductive layer 12, so as to better meet the insulation isolation requirements of different conductive layers.

[0112] In some embodiments, the width of the second insulating portion 22 in the first direction X can be determined according to the width of the conductive layer covered by the second insulating portion 22, and the specific width can be flexibly set according to the actual situation, which is not limited herein.

[0113] In some embodiments, as shown in FIG. 3 and FIG. 6, the first insulating part 21 covers the isolation groove 13. By arranging the first insulating part 21 on the first conductive layer 11 or the second conductive layer 12 and extending the first insulating part 21 to cover the adjacent isolation groove 13, the coverage area of the first insulating part 21 is increased, so as to effectively avoid the short circuit between the electrical connection and the opposite conductive layer when the first current collecting electrode 14 or the second current collecting electrode 15 is connected in series by the electrical connection.

[0114] In some embodiments, as shown in FIG. 3 and FIG. 6, the first insulating part 21 covers the isolation groove 13 and the exposed conductive layer adjacent to the isolation groove 13. By arranging the first insulating part 21 on the first conductive layer 11 or the second conductive layer 12 and covering the isolation groove 13 and the exposed conductive layer adjacent to the isolation groove 13, the insulation isolation effect of the first insulating part 21 can be further increased.

[0115] Optionally, the embodiment of the present application further provides a photovoltaic module, comprising the solar cell in the above-mentioned embodiments.

[0116] In the embodiment of the present application, the back surface of the cell substrate 10 is provided with the first conductive layer 11 and the second conductive layer 12 which are opposite in electrical type and arranged alternately in intervals, and the first insulating part 21 is arranged on the first conductive layer 11 and the second conductive layer 12, so that the first insulating part 21 can play the role of insulation isolation between the electrical connection and the opposite conductive layer or the current collecting electrode when the first current collecting electrode 14 or the second current collecting electrode 15 is connected in series by the electrical connection. Meanwhile, the second insulating part 22 is arranged on both sides of the first insulating part 21, so that the second insulating part 22 covers the isolation groove 13 between the first conductive layer 11 and the second conductive layer 12, and / or the second insulating part 22 covers the conductive layer and the current collecting electrode on both sides of the first insulating part 21. In this way, the second insulating part 22 can play the role of insulation isolation between the first conductive layer 11 and the second conductive layer 12 in the non-electrical connection area, so as to avoid the conduction between the first conductive layer 11 and the second conductive layer 12 through the conductive foreign matters such as welding slag, thereby reducing the risk of short circuit of the solar cell.

[0117] Optionally, the photovoltaic module further comprises an electrical connection, and the solar cell is provided as a plurality of solar cells, and the electrical connection is electrically connected with the current collecting electrode of the solar cell. In this way, the plurality of solar cells can be connected in series by the electrical connection to form a cell string.

[0118] In some embodiments, the solar cell can be a busbar-free cell, and the electrical connection member is directly connected with the connecting part of the current collecting electrode on the cell base 10. Specifically, the electrical connection member can include a first electrical connection member and a second electrical connection member extending along the first direction X, wherein the first electrical connection member can be simultaneously connected with the first connecting part 14a of the plurality of first current collecting electrodes 14, and the first insulating part 21 is arranged between the first electrical connection member and the second current collecting electrode 15 for insulation separation. The second electrical connection member can be simultaneously connected with the second connecting part 15a of the plurality of second current collecting electrodes 15, and the first insulating part 21 is arranged between the second electrical connection member and the first current collecting electrode 14 for insulation separation.

[0119] In other embodiments, the solar cell can be a busbar cell, and the surface of the solar cell is further provided with a busbar, which is connected with the connecting part of the current collecting electrode, and then the electrical connection member is connected with the busbar to realize the electrical connection of the plurality of solar cells.

[0120] Specifically, as shown in FIG. 1, the busbar includes a first busbar 16 and a second busbar 17 extending along the first direction X, the first busbar 16 is simultaneously connected with the first connecting part 14a of the plurality of first current collecting electrodes 14, and the first insulating part 21 is arranged between the first busbar 16 and the second current collecting electrode 15 for insulation separation. The second busbar 17 is simultaneously connected with the second connecting part 15a of the plurality of second current collecting electrodes 15, and the first insulating part 21 is arranged between the second busbar 17 and the first current collecting electrode 14 for insulation separation. Then, the busbars of the plurality of solar cells are connected in series by the electrical connection member, and the electrical connection of the plurality of solar cells can be realized.

[0121] The solar cell and photovoltaic module provided by the embodiments of the present application will be described in detail below in combination with the drawings and specific embodiments and application scenarios thereof.

[0122] As shown in FIGS. 14-15, according to a solar cell of an embodiment of the present application, it includes a cell base 10 and an insulating member 20, the back surface of the cell base 10 is provided with a conductive layer and a current collecting electrode, the conductive layer includes a first conductive layer 11 and a second conductive layer 12 which are oppositely arranged and alternately arranged along a first direction X, an isolation area 131 is arranged between adjacent first conductive layer 11 and second conductive layer 12, the current collecting electrode includes a first current collecting electrode 14 arranged on the first conductive layer 11 and a second current collecting electrode 15 arranged on the second conductive layer 12, the first current collecting electrode 14 is provided with a first connecting part 14a, and the second current collecting electrode 15 is provided with a second connecting part 15a.

[0123] The insulating piece 20 includes a first insulating part 21 and a second insulating part 22. The first conductive layer 11 is provided with the first insulating part 21 at a position corresponding to the second connecting part 15a, and the second conductive layer 12 is provided with the first insulating part 21 at a position corresponding to the first connecting part 14a. The second insulating part 22 is arranged on both sides of the first insulating part 21 along the second direction Y intersecting the first direction X. The second insulating part 22 covers the conductive layers and the current collecting electrodes thereon on both sides of the first insulating part 21.

[0124] In the embodiment, the back surface of the battery substrate 10 is provided with the first conductive layer 11 and the second conductive layer 12 with opposite electric types and arranged alternately with intervals. The first insulating part 21 is arranged on the first conductive layer 11 and the second conductive layer 12, so that when the first current collecting electrode 14 or the second current collecting electrode 15 is connected in series by the electric connecting piece, the first insulating part 21 can insulate and separate the electric connecting piece from the conductive layer and the current collecting electrode. Meanwhile, the second insulating part 22 is arranged on both sides of the first insulating part 21, and the second insulating part 22 covers the conductive layers and the current collecting electrodes thereon on both sides of the first insulating part 21. In this way, the second insulating part 22 can insulate and separate the first conductive layer 11 and the second conductive layer 12 in the non-electric connecting piece connecting area, so as to avoid the conduction between the first conductive layer 11 and the second conductive layer 12 through the conductive foreign matters such as welding slag, thereby reducing the risk of short circuit of the solar cell. Meanwhile, the insulation effect of the first and second conductive layers can be improved, and the overall processing and preparation of the insulating piece 20 are facilitated.

[0125] Specifically, as shown in FIG. 15, the solar cell includes a battery substrate 10 having opposite front and back surfaces. The front surface is a surface for receiving sunlight. The front surface of the battery substrate 10 can be provided with a textured layer 40 and an anti-reflection layer 50 to improve the light absorption rate of the front surface of the battery substrate 10. As shown in FIG. 14, the back surface of the battery substrate 10 has a first direction X and a second direction Y intersecting each other. The back surface of the battery substrate 10 is provided with the first conductive layer 11 and the second conductive layer 12 arranged alternately along the first direction X. The first conductive layer 11 and the second conductive layer 12 are separated by an isolation area 131 arranged between adjacent first conductive layers 11 and second conductive layers 12. Preferably, the second direction Y is perpendicular to the first direction X.

[0126] The first conductive layer 11 is provided with a first current collecting electrode 14 extending along the second direction Y, and the second conductive layer 12 is provided with a second current collecting electrode 15 extending along the second direction Y. Along the second direction Y, the first current collecting electrode 14 is provided with a plurality of first connecting parts 14a arranged at intervals, and the second current collecting electrode 15 is provided with a plurality of second connecting parts 15a arranged at intervals. The projections of the first connecting parts 14a and the second connecting parts 15a on a plane perpendicular to the first direction X do not coincide.

[0127] Further, the electric connection member can be electrically connected to the first connection portions 14a of the plurality of first current collecting electrodes 14 simultaneously in the first direction X to achieve current convergence of the plurality of first current collecting electrodes 14, and the electric connection member can be electrically connected to the second connection portions 15a of the plurality of second current collecting electrodes 15 simultaneously in the first direction X to achieve current convergence of the plurality of second current collecting electrodes 15.

[0128] The electric connection member connected to the first connection portion 14a is a first electric connection member, and the first insulating portion 21 is needed to insulate and separate the first electric connection member from the second conductive layer 12 and the second current collecting electrode 15 to avoid short circuiting between the first electric connection member and the second conductive layer 12 and the second current collecting electrode 15. Correspondingly, the electric connection member connected to the second connection portion 15a is a second electric connection member, and the first insulating portion 21 is needed to insulate and separate the second electric connection member from the first conductive layer 11 and the first current collecting electrode 14 to avoid short circuiting between the second electric connection member and the first conductive layer 11 and the first current collecting electrode 14.

[0129] It should be understood that the first connection portion 14a is the part of the first current collecting electrode 14 for connecting the first electric connection member. The second connection portion 15a is the part of the second current collecting electrode 15 for connecting the second electric connection member. The first connection portion 14a and the second connection portion 15a can be the area on the current collecting electrode for electrical connection, or can be a widened portion provided on the current collecting electrode, or can be a pad provided on the current collecting electrode for connecting the electric connection member.

[0130] It can be understood that, during the operation of the solar cell, the first current collecting electrode 14 and the second current collecting electrode 15 can collect the carriers generated by the conversion of the cell substrate 10. Further, by connecting the first current collecting electrode 14 or the second current collecting electrode 15 in series through the electric connection member, the carriers collected by each current collecting electrode can be converged and led out of the solar cell.

[0131] In some embodiments, as shown in FIG. 14, the second insulating portion 22 is provided on both sides of the first insulating portion 21 in the second direction Y, i.e., the second insulating portion 22 is provided on the left and right sides of the first insulating portion 21 in FIG. 14, and the dashed line represents the boundary position of the first insulating portion 21 and the second insulating portion 22. Further, the second insulating portion 22 covers the conductive layer and the current collecting electrode on both sides of the first insulating portion 21 in the second direction Y, i.e., on the left and right sides of the first insulating portion 21 in FIG. 14. In this way, the second insulating portion 22 covers at least one of the first conductive layer 11 and the second conductive layer 12, thereby reducing the risk of conduction between the first conductive layer 11 and the second conductive layer 12 due to conductive foreign matter such as welding slag.

[0132] It can be understood that the corresponding position of the first conductive layer 11 and the second connecting part 15a refers to the area on the first conductive layer 11 at least partially coinciding with the orthographic projection of the second connecting part 15a in the first direction X; and the corresponding position of the second conductive layer 12 and the first connecting part 14a refers to the area on the second conductive layer 12 at least partially coinciding with the orthographic projection of the first connecting part 14a in the first direction X.

[0133] In some embodiments, the current collecting electrode can be made of a metal conductive material. For example, the current collecting electrode can be a silver electrode, a copper electrode, an alloy electrode, or a multi-layer metal electrode, etc. Of course, the current collecting electrode can also be made of other materials, which can be flexibly set according to actual conditions, and the present application does not make any limitation here.

[0134] It can be understood that in the solar cell, the current collecting electrode forms an ohmic connection with the cell substrate 10, and the current collecting electrode is made of a metal conductive material with good conductivity, which can improve the ability of the current collecting electrode to collect carriers.

[0135] In some embodiments, as shown in FIG. 14, the second insulating part 22 covers the conductive layer and the current collecting electrode on both sides of the first insulating part 21 along the second direction Y, and the second insulating part 22 at least partially covers the side wall of the conductive layer adjacent to the isolation region 131.

[0136] In the embodiments of the present application, while the second insulating part 22 covers the conductive layer and the current collecting electrode on both sides of the first insulating part 21 along the second direction Y, the second insulating part 22 is extended in the first direction X to cover the side wall of the conductive layer adjacent to the isolation region 131, so as to increase the area of the second insulating part 22 covering the conductive layer, which helps to improve the insulation isolation effect of the second insulating part 22 and further reduce the risk of short circuit between the first conductive layer 11 and the second conductive layer 12.

[0137] In some embodiments, the second insulating part 22 is arranged on both sides of the first insulating part 21 on the first conductive layer 11, the second insulating part 22 covers the first conductive layer 11 and the first current collecting electrode 14 on both sides of the first insulating part 21, and the second insulating part 22 is extended in the first direction X to cover the side wall of the first conductive layer 11 adjacent to the isolation region 131.

[0138] In some other embodiments, the second insulating part 22 is arranged on both sides of the first insulating part 21 on the second conductive layer 12, the second insulating part 22 covers the second conductive layer 12 and the second current collecting electrode 15 on both sides of the first insulating part 21, and the second insulating part 22 is extended in the first direction X to cover the side wall of the second conductive layer 12 adjacent to the isolation region 131.

[0139] In some embodiments, as shown in FIGS. 15 and 16, the second insulating part 22 at least partially covers the adjacent isolation region 131.

[0140] In the embodiments of the present application, while the second insulating part 22 covers the conductive layers and the current collecting electrodes on both sides of the first insulating part 21 along the second direction Y, the second insulating part 22 extends to cover the adjacent isolation region 131 along the first direction X, so that the second insulating part 22 simultaneously forms insulating isolation for the conductive layer and the adjacent isolation region 131, which can ensure that the second insulating part 22 completely covers the corresponding conductive layer, further reduces the probability of contact between the slag and the conductive layer, and further improves the insulating isolation of the second insulating part 22, thereby reducing the risk of short circuit between the first conductive layer 11 and the second conductive layer 12.

[0141] In some embodiments, the second insulating part 22 at least partially covers the adjacent conductive layer of the opposite conductive type.

[0142] In the embodiments of the present application, while the second insulating part 22 covers the conductive layers and the current collecting electrodes on both sides of the first insulating part 21 along the second direction Y, the second insulating part 22 extends to cover the adjacent isolation region 131 along the first direction X, so that the second insulating part 22 simultaneously forms insulating isolation for the conductive layer and the adjacent isolation region 131, which can ensure that the second insulating part 22 completely covers the corresponding conductive layer, further reduces the probability of contact between the slag and the conductive layer, and further improves the insulating isolation of the second insulating part 22, thereby reducing the risk of short circuit between the first conductive layer 11 and the second conductive layer 12.

[0143] In the embodiments of the present application, while the second insulating part 22 covers the conductive layers and the current collecting electrodes on both sides of the first insulating part 21 along the second direction Y, the second insulating part 22 extends to cover the adjacent isolation region 131 along the first direction X, so that the second insulating part 22 simultaneously forms insulating isolation for the conductive layer and the adjacent isolation region 131, which can ensure that the second insulating part 22 completely covers the corresponding conductive layer, further reduces the probability of contact between the slag and the conductive layer, and further improves the insulating isolation of the second insulating part 22, thereby reducing the risk of short circuit between the first conductive layer 11 and the second conductive layer 12.

[0144] It should be understood that the second insulating part 22 on the first conductive layer 11 and the second conductive layer 12 can completely cover the first conductive layer 11, the second conductive layer 12 and the isolation region 131 except the connecting part, so as to achieve better short circuit prevention effect.

[0145] In some embodiments, as shown in FIG. 15, along the first direction X, the width of the second insulating part 22 is D12, the width of the second conductive layer 12 is W2, and the spacing between the adjacent two first current collecting electrodes 14 is H2. The second insulating part 22 covering the second conductive layer 12 satisfies: W2-20 μm≤D12≤H2.

[0146] In the embodiments of the present application, the width D12 of the second insulating portion 22 is greater than or equal to W2-20 μm, so that the second insulating portion 22 at least partially covers the second conductive layer 12, while allowing a certain process error to cover most of the width of the second conductive layer 12, and then forming a shielding isolation on the surface of the second conductive layer 12 by the second insulating portion 22, to avoid the conduction of the adjacent first conductive layer 11 and the second conductive layer 12 due to the conductive foreign matter such as welding slag. At the same time, the width D12 of the second insulating portion 22 is less than or equal to the spacing H2 between the adjacent two first current collecting electrodes 14, so as to form a shielding coverage on the region between the adjacent two first current collecting electrodes 14 by the second insulating portion 22.

[0147] In some embodiments, as shown in FIG. 16, the width of the first conductive layer 11 is W3, the spacing between the adjacent two second current collecting electrodes 15 is H3, and the second insulating portion 22 covering the first conductive layer 11 satisfies: W3-20 μm≤D12≤H3.

[0148] In the embodiments of the present application, the width D12 of the second insulating portion 22 is greater than or equal to W3-20 μm, so that the second insulating portion 22 at least partially covers the first conductive layer 11, while allowing a certain process error to cover most of the width of the first conductive layer 11, and then forming a shielding isolation on the surface of the first conductive layer 11 by the second insulating portion 22, to avoid the conduction of the adjacent first conductive layer 11 and the second conductive layer 12 due to the conductive foreign matter such as welding slag. At the same time, the width D12 of the second insulating portion 22 is less than or equal to the spacing H3 between the adjacent two second current collecting electrodes 15, so as to form a shielding coverage on the region between the adjacent two first current collecting electrodes 14 by the second insulating portion 22.

[0149] In some embodiments, as shown in FIG. 14, the second insulating portion 22 on the first conductive layer 11 and the second insulating portion 22 on the adjacent second conductive layer 12 are at least partially connected in the first direction X. In this way, the continuity between the second insulating portion 22 on the first conductive layer 11 and the second insulating portion 22 on the adjacent second conductive layer 12 in the first direction X can be ensured, and then the insulation isolation effect of the second insulating portion 22 on the first conductive layer 11 and the second conductive layer 12 in the first direction X can be ensured.

[0150] In some embodiments, as shown in FIG. 9, FIG. 11 and FIG. 14, the second insulating portion 22 on the first conductive layer 11 is at least partially connected with the second insulating portion 22 on the adjacent second conductive layer 12 in the second direction Y. In this way, the continuity between the second insulating portion 22 on the first conductive layer 11 and the second insulating portion 22 on the adjacent second conductive layer 12 in the second direction Y can be ensured, and the insulation isolation effect of the second insulating portion 22 on the first conductive layer 11 and the second conductive layer 12 in the second direction Y can be ensured. When the second insulating portion 22 on the first conductive layer 11 and the second conductive layer 12 is at least partially connected in the first direction X and at least partially connected in the second direction Y, there is no gap between the adjacent first conductive layer 11 and the second conductive layer 12 in the extension direction of the conductive layer, which can further reduce the risk of short circuit.

[0151] In some embodiments, there is a gap (not shown in the figure) between the second insulating portion 22 on the first conductive layer 11 and the second insulating portion 22 on the adjacent second conductive layer 12. In this way, while ensuring the insulation isolation between the first conductive layer 11 and the second conductive layer 12 by the second insulating portion 22, the amount of material used to prepare the second insulating portion 22 can be appropriately saved, the production cost can be saved, and the occurrence of warping of the solar cell can be reduced.

[0152] In some embodiments, as shown in FIG. 9, FIG. 11 and FIG. 14, the width of the first insulating portion 21 on the second conductive layer 12 in the second direction Y is greater than the width of the first connecting portion 14a, and / or the width of the first insulating portion 21 on the first conductive layer 11 in the second direction Y is greater than the width of the second connecting portion 15a.

[0153] It can be understood that when the first connecting portions 14a of the plurality of first collecting electrodes 14 are connected in series by the electrical connecting member, or the second connecting portions 15a of the plurality of second collecting electrodes 15 are connected in series by the electrical connecting member, the position of the electrical connecting member can deviate. In this application, the width of the first insulating portion 21 on the second conductive layer 12 is greater than the width of the first connecting portion 14a, or the width of the first insulating portion 21 on the first conductive layer 11 is greater than the width of the second connecting portion 15a, so as to reduce the precision requirement of the connecting operation, facilitate the actual processing operation, and ensure the insulation isolation effect of the first insulating portion 21.

[0154] Optionally, as shown in FIG. 14, the width of the second insulating portion 22 on the first conductive layer 11 in the first direction X is not equal to the width of the second insulating portion 22 on the second conductive layer 12 in the first direction X.

[0155] It can be understood that the structural design of the solar cell requires that the widths of the first conductive layer 11 and the second conductive layer 12 in the first direction X are different, and then the width of the corresponding second insulating part 22 is reasonably set according to the widths of the first conductive layer 11 and the second conductive layer 12, so as to better meet the insulation and isolation requirements of different conductive layers.

[0156] The width of the second insulating part 22 in the first direction X can be determined according to the width of the conductive layer covered by the second insulating part 22, and the specific width can be flexibly set according to actual conditions, which is not limited herein.

[0157] As shown in FIGS. 9 to 13, in some embodiments of the solar cell of the present application, the solar cell comprises a cell substrate 10 and an insulating part 20. The back surface of the cell substrate 10 is provided with a conductive layer and a current collecting electrode. The conductive layer comprises first conductive layers 11 and second conductive layers 12 which are oppositely arranged and alternately arranged in the first direction X. An isolation area 131 is arranged between adjacent first conductive layers 11 and second conductive layers 12. The current collecting electrode comprises a first current collecting electrode 14 arranged on the first conductive layer 11 and a second current collecting electrode 15 arranged on the second conductive layer 12. The first current collecting electrode 14 is provided with a first connecting part 14a, and the second current collecting electrode 15 is provided with a second connecting part 15a.

[0158] The insulating part 20 comprises a first insulating part 21 and a second insulating part 22. The first conductive layer 11 is provided with the first insulating part 21 at a position corresponding to the second connecting part 15a, and the second conductive layer 12 is provided with the first insulating part 21 at a position corresponding to the first connecting part 14a. The second insulating part 22 is arranged on both sides of the first insulating part 21 in the second direction Y, and the second direction Y intersects the first direction X. The second insulating part 22 covers the isolation area 131 between the first conductive layer 11 and the second conductive layer 12, and the second insulating part 22 protrudes the first insulating part 21 in the second direction Y.

[0159] In the embodiments of the present application, the back surface of the battery substrate 10 is provided with the first conductive layer 11 and the second conductive layer 12 which are opposite in electric type and arranged alternately in intervals, and then the first insulating part 21 is arranged on the first conductive layer 11 and the second conductive layer 12, so that when the first current collecting electrode 14 or the second current collecting electrode 15 is connected in series by using the electric connecting piece, the first insulating part 21 can play the role of insulating isolation between the electric connecting piece and the opposite conductive layer or the current collecting electrode. At the same time, the second insulating part 22 is arranged on both sides of the first insulating part 21, so that the second insulating part 22 covers the isolation area 131 between the first conductive layer 11 and the second conductive layer 12 and protrudes the first insulating part 21 in the second direction Y. In this way, the second insulating part 22 can play the role of insulating isolation between the first conductive layer 11 and the second conductive layer 12 in the non-electric connecting piece connecting area, so as to avoid the conduction between the first conductive layer 11 and the second conductive layer 12 through the conductive foreign matters such as welding slag, thereby reducing the risk of short circuit of the solar cell. At the same time, the structure design of the insulating part 20 of the present application can save the material for preparing the insulating part 20, and can reduce the problem of warping of the solar cell.

[0160] In some embodiments, as shown in FIGS. 9 and 11, the second insulating part 22 is arranged on both sides of the first insulating part 21 in the second direction Y, that is, the second insulating part 22 is arranged on the left and right sides of the first insulating part 21 in FIGS. 9 and 11, wherein the dashed line represents the boundary position of the first insulating part 21 and the second insulating part 22. Further, the second insulating part 22 covers the isolation area 131 between the first conductive layer 11 and the second conductive layer 12, so as to insulate and isolate the first conductive layer 11 and the second conductive layer 12 on both sides of the isolation area 131, and avoid the conduction between the first conductive layer 11 and the second conductive layer 12 due to the conductive foreign matters such as welding slag falling into the isolation area 131 in the subsequent processing process.

[0161] In some embodiments, as shown in FIGS. 9 to 13, the second insulating part 22 covers the isolation area 131 between the first conductive layer 11 and the second conductive layer 12, and the second insulating part 22 covers at least part of the first conductive layer 11 in the first direction X, and / or the second insulating part 22 covers at least part of the second conductive layer 12 in the first direction X.

[0162] In the embodiments of the present application, while the second insulating part 22 covers the isolation area 131 between the first conductive layer 11 and the second conductive layer 12, the second insulating part 22 is extended to the first conductive layer 11 and / or the second conductive layer 12 on both sides of the isolation area 131 in the first direction X, so as to cover at least part of the exposed first conductive layer 11 and / or the second conductive layer 12 by using the second insulating part 22. In this way, the insulating isolation effect of the second insulating part 22 between the first conductive layer 11 and the second conductive layer 12 can be improved, so as to further reduce the risk of short circuit of the first conductive layer 11 and the second conductive layer 12.

[0163] In some embodiments, as shown in FIG. 12, along the first direction X, the width of the second insulating part 22 is D11, the width of the isolation area 131 is W1, and the distance between the adjacent first and second current collecting electrodes 14 and 15 is H1, which satisfies: W1-20 μm≤D11≤H1.

[0164] In the embodiments of the present application, while the second insulating part 22 covers the isolation area 131 between the first and second conductive layers 11 and 12, the width D11 of the second insulating part 22 is set to be greater than or equal to W1-20 μm, so that the second insulating part 22 covers the isolation area 131, thereby avoiding the conductive foreign matter such as slag from falling into the isolation area 131 to cause the short circuit of the first and second conductive layers 11 and 12 on both sides of the isolation area 131, and meanwhile allowing the second insulating part 22 to cover most of the width of the isolation area 131 under certain process error.

[0165] In some embodiments, as shown in FIG. 11, along the second direction Y, the length of the second insulating part 22 is L, which satisfies: 2.5 mm≤L≤10 mm, while the second insulating part 22 covers the isolation area 131. Specifically, the length L of the second insulating part 22 can be set to be: 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, or any value or range between any two values.

[0166] In the embodiments of the present application, by setting the reasonable range of the length L of the second insulating part 22 along the second direction Y, the effective insulating and isolating effect between the adjacent first and second conductive layers 11 and 12 can be ensured by using the second insulating part 22, and meanwhile the waste caused by the too long second insulating part 22 can be avoided.

[0167] In some embodiments, along the second direction Y, the length of the second insulating part 22 between the adjacent first and second connecting parts 14a and 15a accounts for 30%-95% of the shortest distance between the adjacent first and second connecting parts 14a and 15a. Specifically, the ratio of the length of the second insulating part 22 to the shortest distance between the adjacent first and second connecting parts 14a and 15a can be set to be: 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or any value or range between any two values.

[0168] In the embodiments of the present application, by setting the ratio range of the length of the second insulation part 22 to the shortest distance between the adjacent first busbar part 14a and the second busbar part 15a, the preparation cost of the second insulation part 22 can be saved while ensuring that the area between the adjacent first busbar part 14a and the second busbar part 15a is effectively insulated by the second insulation part 22.

[0169] In some embodiments, as shown in FIGS. 9, 11 and 14, the second insulation part 22 can be designed in any of the above embodiments. The first insulation part 21 also covers the isolation region 131. By providing the first insulation part 21 on the first conductive layer 11 or the second conductive layer 12 and extending the first insulation part 21 to cover the adjacent isolation region 131, the coverage area of the first insulation part 21 is increased, so as to effectively avoid the problem of short circuit between the electrical connection and the conductive layer of different polarity when the first current collecting electrode 14 or the second current collecting electrode 15 is connected in series by the electrical connection.

[0170] In some embodiments, as shown in FIGS. 9, 11 and 14, the first insulation part 21 also covers the isolation region 131 and the exposed conductive layer adjacent to the isolation region 131.

[0171] It can be understood that in specific applications, since the position of the first insulation part 21 provided on the conductive layer is closer to the connection position of the current collecting electrode and the electrical connection, the risk of conductive foreign matter such as welding slag is higher. Therefore, by providing the first insulation part 21 on the first conductive layer 11 or the second conductive layer 12 and covering the isolation region 131 and the exposed conductive layer adjacent to the isolation region 131, the insulation isolation effect of the first insulation part 21 can be further improved.

[0172] In some embodiments, the width of the isolation region on the solar cell is 30-600 μm. The width of the isolation region is relatively large in size relative to the welding slag, so that even if there are holes or weak positions in the second insulation part, the relatively wide isolation region can reduce the risk of short circuit of the first conductive layer 11 and the second conductive layer 12. That is, the isolation region 131 improves the problem of welding slag short circuit from the dimension of physical distance.

[0173] Specifically, the width of the isolation region can be set to 30 μm, 50 μm, 80 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, etc. or a range between any two values.

[0174] The embodiments of the present application also provide a photovoltaic module, comprising the solar cell in any of the above embodiments.

[0175] In the embodiments of the present application, the back surface of the battery substrate 10 is provided with the first conductive layer 11 and the second conductive layer 12 which are oppositely arranged and alternately spaced. Then, the first insulating part 21 is arranged on the first conductive layer 11 and the second conductive layer 12, so that when the first current collecting electrode 14 or the second current collecting electrode 15 is connected in series by the electrical connector, the first insulating part 21 can insulate and isolate the electrical connector from the opposite conductive layer and the current collecting electrode. At the same time, the second insulating part 22 is arranged on both sides of the first insulating part 21, so that the second insulating part 22 covers the isolation area 131 between the first conductive layer 11 and the second conductive layer 12, and / or the second insulating part 22 covers the conductive layer and the current collecting electrode on both sides of the first insulating part 21. In this way, the second insulating part 22 can insulate and isolate the first conductive layer 11 and the second conductive layer 12 in the non-electrical connector connection area, so as to avoid the conduction between the first conductive layer 11 and the second conductive layer 12 through the conductive foreign matter such as welding slag, thereby reducing the risk of short circuit of the solar cell.

[0176] It should be noted that in the above embodiments, the first insulating part 21 can be continuous with the second insulating part 22, as shown in FIGS. 9, 11 and 14. In this case, the risk of abnormal short circuit caused by the conductive foreign matter such as welding slag falling into the gap between the first insulating part 21 and the second insulating part 22 can be avoided. The first insulating part 21 and the second insulating part 22 can also have a gap (not shown in the drawings). In this case, not only the insulating part material can be saved, but also the first and second insulating parts can be independently arranged and independently manufactured.

[0177] Optionally, the photovoltaic module further comprises an electrical connector, and the solar cell is provided as a plurality of solar cells, and the electrical connector is electrically connected to the junction part of the current collecting electrode of the solar cell. Further, the plurality of solar cells can be connected in series by the electrical connector to form a cell string.

[0178] In some embodiments, the solar cell can be a cell without a busbar, and the electrical connector is directly electrically connected to the junction part of the current collecting electrode on the battery substrate 10. Specifically, the electrical connector can include a first electrical connector and a second electrical connector extending along the first direction X, wherein the first electrical connector can be electrically connected to the first junction part 14a of a plurality of first current collecting electrodes 14 at the same time, and the first insulating part 21 is arranged between the first electrical connector and the second current collecting electrode 15 for insulating and isolating. The second electrical connector can be electrically connected to the second junction part 15a of a plurality of second current collecting electrodes 15 at the same time, and the first insulating part 21 is arranged between the second electrical connector and the first current collecting electrode 14 for insulating and isolating.

[0179] In some embodiments, the solar cell can be a cell with a busbar, and the surface of the solar cell is further provided with a busbar. The part of the busbar intersecting with the current collecting electrode is a connecting part. The connecting part is connected with the electrical connecting member to realize the electrical connection of the plurality of solar cells. It should be understood that the busbar can be an electrode with a busbar function provided on the surface of the solar cell. The electrode with the busbar function can be an electrode in one piece, an electrode divided into multiple segments, or an electrode segment provided at both ends of the cell. The busbar can also be a busbar formed of a conductive material such as a tin alloy material on the surface of the solar cell. The busbar can also be other forms of members with a busbar function.

[0180] Specifically, as shown in FIG. 9, the busbar includes a first busbar 161 and a second busbar 171 extending along the first direction X. The first busbar 161 is electrically connected with the first connecting parts 14a of the plurality of first current collecting electrodes 14 at the same time, and the first insulating part 21 is arranged between the first busbar 161 and the second current collecting electrode 15 to insulate and isolate. The second busbar 171 is electrically connected with the second connecting parts 15a of the plurality of second current collecting electrodes 15 at the same time, and the first insulating part 21 is arranged between the second busbar 171 and the first current collecting electrode 14 to insulate and isolate. Further, the busbars of the plurality of solar cells are connected in series by using the electrical connecting member, and the electrical connection of the plurality of solar cells can be realized.

[0181] In some embodiments, an auxiliary connecting block is arranged between the connecting part of the current collecting electrode and the electrical connecting member. The height difference between the top surface of the auxiliary connecting block and the top surface of the first insulating part is less than or equal to 15 μm in the thickness direction of the cell substrate 10. The top surface of the auxiliary connecting block and the top surface of the first insulating part are the surfaces away from the top surface of the cell substrate 10, and the height direction is the thickness direction of the cell substrate 10. For example, the height difference can be 15 μm, 14 μm, 13 μm, 12 μm, 11 μm, 10 μm, 9 μm, 8 μm, 7 μm, 6 μm, 5 μm, 4 μm, 3 μm, 2 μm, 1 μm, etc.

[0182] In the embodiments of the present application, the auxiliary connecting block is arranged between the connecting part of the current collecting electrode and the electrical connecting member, which can assist the connection of the current collecting electrode and the electrical connecting member, thereby improving the connection strength of the current collecting electrode and the electrical connecting member. Moreover, the height difference between the top surface of the auxiliary connecting block and the top surface of the first insulating part is within 15 μm, thereby avoiding the influence of the height of the first insulating part on the connection operation of the electrical connecting member and the connecting part.

[0183] The connection part includes a first connection part 14a on the first current collecting electrode and a second connection part 15a on the second current collecting electrode. It should be noted that the connection part of the current collecting electrode can be a part of the current collecting electrode itself, or a separate component arranged on the current collecting electrode for connection with the electrical connector, and can be flexibly arranged according to actual conditions, which is not limited here.

[0184] In some embodiments, the auxiliary connecting block can be an auxiliary connecting piece arranged between the connection part of the current collecting electrode and the electrical connector, or an auxiliary connecting layer arranged on the side of the electrical connector facing the current collecting electrode.

[0185] In some embodiments, as shown in FIGS. 10 and 16, the thickness of the second insulating part 22 in the thickness direction of the battery substrate 10 is 20-80 μm. For example, the thickness of the second insulating part 22 can be set to any value or a range between any two values, such as 80 μm, 70 μm, 60 μm, 50 μm, 40 μm, 30 μm, 20 μm, etc.

[0186] In some embodiments, as shown in FIGS. 10 and 16, the thickness of the first insulating part 21 in the thickness direction of the battery substrate 10 is 20-80 μm. For example, the thickness of the first insulating part 21 can be set to any value or a range between any two values, such as 80 μm, 70 μm, 60 μm, 50 μm, 40 μm, 30 μm, 20 μm, etc.

[0187] In the embodiments of the present application, by setting the thickness of the first insulating part 21 and the second insulating part 22 in the insulating piece 20, it is ensured that when the conductive foreign matter such as slag falls on the insulating piece 20, the first insulating part 21 or the second insulating part 22 will not be pierced, so as to cause the short circuit between the conductive foreign matters through the insulating piece 20 and the conductive layer.

[0188] In some embodiments, the distance between the center line of the electrical connector and the center of the connection part in the second direction Y is less than or equal to 2 mm. For example, the distance is 0.1 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, etc.

[0189] The center line of the electrical connector refers to the geometric center line of the electrical connector in the front projection pattern on the back of the battery substrate 10, and the center of the connection part refers to the geometric center point of the connection part in the front projection pattern on the back of the battery substrate 10.

[0190] In the embodiments of the present application, by setting the distance between the center line of the electrical connector and the center of the connection part to be less than or equal to 2 mm, it is avoided that the connection position of the electrical connector and the connection part deviates too much, so as to cause the risk that the electrical connector exceeds the first insulating part 21 and is short-circuited with the conductive layer.

[0191] In some embodiments, the second insulating portion and / or the first insulating portion has conductive particles thereon, and the minimum distance between the conductive particles and the first conductive layer, the second conductive layer, the first current collecting electrode and the second current collecting electrode is greater than 10 μm. For example, the distance between the conductive particles and the conductive layer or the current collecting electrode can be 10 μm, 11 μm, 13 μm, 15 μm, 16 μm, 18 μm, 20 μm, etc. At this time, the distance between the conductive particles (e.g. welding slag) and the conductive structure such as the conductive layer or the current collecting electrode is relatively large, and is isolated by the first insulating portion and the second insulating portion, which can further reduce the risk of short circuit.

[0192] In some embodiments, an auxiliary connecting block is arranged between the busbar and the electrical connector, the battery base 10 has conductive particles on the auxiliary connecting block, and the maximum distance between the conductive particles and the auxiliary connecting block is less than 30 mm; and / or, the size of the auxiliary connecting block is less than 2000 μm. For example, the maximum distance between the conductive particles and the auxiliary connecting block can be 30 mm, 25 mm, 22 mm, 20 mm, 18 mm, 15 mm, 13 mm, 11 mm, 10 mm, 8 mm, 5 mm, etc. The maximum size of the auxiliary connecting block can be 2000 μm, 1800 μm, 1500 μm, 1200 μm, 1000 μm, 800 μm, etc.

[0193] In the embodiments of the present application, by designing the size of the auxiliary connecting block, the problem of excessive splashing of the conductive particles (welding slag) caused by the auxiliary connecting block being too large can be improved, and thus the distance and amount of splashing of the conductive particles (welding slag) can be reduced from the direction of the auxiliary connecting block. By controlling the distance between the conductive particles and the auxiliary connecting block, the force of splashing of the conductive particles can be weakened, and the conductive particles can be prevented from piercing the first insulating portion 21 and the second insulating portion 22, and thus the risk of short circuit can be further reduced.

[0194] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0195] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A solar cell, wherein, The application relates to a battery substrate, an insulating piece and a battery. The battery substrate comprises a back surface provided with a conductive layer and a current collecting electrode, the conductive layer comprises first and second conductive layers of opposite conductive types and arranged alternately along a first direction, and an isolation groove is arranged between adjacent first and second conductive layers, the current collecting electrode comprises a first current collecting electrode arranged on the first conductive layer and a second current collecting electrode arranged on the second conductive layer, the first current collecting electrode is provided with a first connecting part, and the second current collecting electrode is provided with a second connecting part. The first conductive layer is provided with a first insulating part at a position corresponding to the second connecting part, and the second conductive layer is provided with a second insulating part at a position corresponding to the first connecting part. The second insulating part is arranged on both sides of the first insulating part along a second direction intersecting the first direction. The second insulating part covers the isolation groove between the first and second conductive layers and protrudes from the first insulating part along the second direction, and / or the second insulating part covers the conductive layers and the current collecting electrodes on both sides of the first insulating part along the second direction.

2. The solar cell of claim 1, wherein, The second insulating part covers the isolation groove between the first and second conductive layers and extends along the first direction to cover at least part of the exposed first conductive layer, and / or the second insulating part extends along the first direction to cover at least part of the exposed second conductive layer.

3. The solar cell of claim 2, wherein, Along the first direction, the width of the second insulating part is D11, the width of the isolation groove is W1, and the distance between adjacent first and second current collecting electrodes is H1, and the following condition is met: W1-20 mu m <= D11 <= H1.

4. The solar cell of claim 1, wherein, When the second insulating part covers the isolation groove, along the second direction, the length of the second insulating part is L, and the following condition is met: 2.5 mm <= L <= 10 mm; and / or, Along the second direction, the length of the second insulating part between adjacent first and second connecting parts accounts for 30%-95% of the shortest distance between the adjacent first and second connecting parts.

5. The solar cell according to any one of claims 1 to 4, wherein, The second insulating part covers the conductive layers and the current collecting electrodes on both sides of the first insulating part along the first direction, and the second insulating part extends along the first direction to cover the side wall of the conductive layer adjacent to the isolation groove.

6. The solar cell of claim 5, wherein, The second insulating part extends along the first direction to cover the adjacent isolation groove.

7. The solar cell of claim 6, wherein, The second insulating part extends along the first direction to cover the adjacent conductive layer of the opposite conductive type.

8. The solar cell of claim 5, wherein, Along the first direction, the width of the second insulating part is D12, the width of the second conductive layer is W2, and the distance between adjacent first current collecting electrodes is H2, and the following condition is met: W2-20 mu m <= D12 <= H2. Or, the width of the first conductive layer is W3, the distance between adjacent second current collecting electrodes is H3, and the following condition is met: W3-20 mu m <= D12 <= H3.

9. The solar cell according to any one of claims 1 to 4, 6 to 8, wherein, The second insulating part on the first conductive layer is at least partially connected with the second insulating part on the adjacent second conductive layer along the first direction. Or, the second insulating part on the first conductive layer and the second insulating part on the adjacent second conductive layer are at least partially connected in the second direction. Or, there is a gap between the second insulating part on the first conductive layer and the second insulating part on the adjacent second conductive layer.

10. The solar cell according to any one of claims 1 to 4, 6 to 8, wherein, In the second direction, the width of the first insulating part on the second conductive layer is greater than the width of the first busbar. And / or, in the second direction, the width of the first insulating part on the first conductive layer is greater than the width of the second busbar.

11. The solar cell according to any one of claims 1 to 4, 6 to 8, wherein, In the case that the second insulating part covers the conductive layers and current collecting electrodes on both sides of the first insulating part in the first direction, the width of the second insulating part on the first conductive layer and the second insulating part on the second conductive layer in the first direction are not equal.

12. The solar cell according to any one of claims 1 to 4, 6 to 8, wherein, The first insulating part covers the isolation groove, or the first insulating part covers the isolation groove and the exposed conductive layer adjacent to the isolation groove.

13. The solar cell of any of claims 1-4, 6-8, wherein, The current collecting electrode is a silver electrode, a copper electrode, an alloy electrode or a multi-layer metal electrode.

14. A photovoltaic module, wherein, The solar cell comprises: The solar cell according to any one of claims 1-13.

15. The photovoltaic module of claim 14, wherein, The photovoltaic module further comprises an electrical connector, and the solar cell is provided in plurality, and the electrical connector is electrically connected with the busbar of the current collecting electrode of the solar cell.

16. The photovoltaic module of claim 15, wherein, The electrical connector and the busbar are provided with a main grid therebetween.

17. A solar cell, wherein, The solar cell comprises: A battery base, the back surface of the battery base is provided with a conductive layer and a current collecting electrode, the conductive layer comprises a first conductive layer and a second conductive layer which are arranged alternately in opposite conductive types and in a first direction, and an isolation area is provided between adjacent first conductive layer and second conductive layer, the current collecting electrode comprises a first current collecting electrode provided on the first conductive layer and a second current collecting electrode provided on the second conductive layer, the first current collecting electrode is provided with a first busbar, and the second current collecting electrode is provided with a second busbar; An insulating member, comprising a first insulating part and a second insulating part, the first conductive layer is provided with the first insulating part at a position corresponding to the second busbar, and the second conductive layer is provided with the first insulating part at a position corresponding to the first busbar; The second insulating part is provided on both sides of the first insulating part in a second direction, the second direction intersects the first direction; the second insulating part covers the conductive layer and the current collecting electrode thereon on both sides of the first insulating part in the second direction.

18. The solar cell of claim 17, wherein, The second insulating part covers the conductive layer and the current collecting electrode thereon on both sides of the first insulating part in the second direction, and the second insulating part at least partially covers the side wall of the conductive layer adjacent to the isolation area.

19. The solar cell of claim 18, wherein, The second insulating part at least partially covers the adjacent isolation area.

20. The solar cell of claim 19, wherein, The second insulating part at least partially covers the adjacent conductive layer of another opposite conductive type.

21. The solar cell of claim 17, wherein, In the first direction, the width of the second insulating part is D12, the width of the second conductive layer is W2, and the interval between two adjacent first current collecting electrodes is H2, and the following is satisfied: W2-20μm≤D12≤H2. Or, the width of the first conductive layer is W3, and the interval between two adjacent second current collecting electrodes is H3, and the following is satisfied: W3-20μm≤D12≤H3.

22. The solar cell of any of claims 17-21, wherein, the second insulating part on the first conductive layer and the second insulating part on the second conductive layer are at least partially connected in a first direction; and / or, the second insulating part on the first conductive layer and the second insulating part on the second conductive layer are at least partially connected in a second direction; or, there is a gap between the second insulating part on the first conductive layer and the second insulating part on the second conductive layer.

23. The solar cell of any of claims 17-21, wherein, In the second direction, the width of the first insulating part on the second conductive layer is greater than the width of the first connecting part; and / or, in the second direction, the width of the first insulating part on the first conductive layer is greater than the width of the second connecting part.

24. The solar cell of any of claims 17-21, wherein, The width of the second insulating part on the first conductive layer and the second insulating part on the second conductive layer in the first direction is not equal.

25. A solar cell, wherein, comprising: a battery substrate, the back surface of the battery substrate being provided with a conductive layer and a current collecting electrode, the conductive layer comprising a first conductive layer and a second conductive layer of opposite conductive types and arranged alternately in a first direction, an isolation region being provided between adjacent first conductive layer and second conductive layer, the current collecting electrode comprising a first current collecting electrode provided on the first conductive layer and a second current collecting electrode provided on the second conductive layer, the first current collecting electrode being provided with a first connecting part, and the second current collecting electrode being provided with a second connecting part; an insulating member comprising a first insulating part and a second insulating part, the first conductive layer being provided with the first insulating part at a position corresponding to the second connecting part, and the second conductive layer being provided with the first insulating part at a position corresponding to the first connecting part; the second insulating part being provided on both sides of the first insulating part in a second direction, the second direction intersecting the first direction; the second insulating part covering the isolation region between the first conductive layer and the second conductive layer and protruding from the first insulating part in the second direction.

26. The solar cell of claim 25, wherein, the second insulating part covering the isolation region between the first conductive layer and the second conductive layer, and the second insulating part covering at least part of the first conductive layer in the first direction, and / or the second insulating part covering at least part of the second conductive layer in the first direction.

27. The solar cell of claim 25, wherein, In the first direction, the width of the second insulating part is D11, the width of the isolation region is W1, and the distance between adjacent first current collecting electrode and second current collecting electrode is H1, satisfying: W1-20μm≤D11≤H1.

28. The solar cell of claim 17 or 25, wherein, In the second direction, the length of the second insulating part is L, satisfying: 2.5mm≤L≤10mm; and / or, In the second direction, the length of the second insulating part between adjacent first connecting part and second connecting part accounts for 30%-95% of the shortest distance between adjacent first connecting part and second connecting part.

29. The solar cell of claim 17 or 25, wherein, the first insulating part covering the isolation region, or the first insulating part covering the isolation region and at least partially covering the exposed conductive layer adjacent to the isolation region.

30. The solar cell of claim 17 or 25, wherein, the current collecting electrode is a silver electrode, a copper electrode, an alloy electrode or a multi-layer metal electrode.

31. The solar cell of claim 17 or 25, wherein, the width of the isolation region is 30μm-600μm.

32. A photovoltaic module, wherein, comprising: the solar cell of any one of claims 17-31.

33. The photovoltaic module of claim 32, wherein, The photovoltaic module further comprises an electrical connector, the solar cells are provided in plurality, and the electrical connector is electrically connected with the collecting electrode of the solar cells.

34. The photovoltaic module of claim 33, wherein, A confluence member is arranged between the electrical connector and the confluence part.

35. The photovoltaic module of claim 33, wherein, An auxiliary connecting block is arranged between the confluence part and the electrical connector, and the height difference between the top surface of the auxiliary connecting block and the top surface of the first insulating part is less than or equal to 15 μm.

36. The photovoltaic module of claim 33, wherein, The thickness of the second insulating part is 20 μm-80 μm; and / or, the thickness of the first insulating part is 20 μm-80 μm.

37. The photovoltaic module of claim 33, wherein, In the second direction, the distance between the center line of the electrical connector and the center of the confluence part is less than or equal to 2 mm.

38. The photovoltaic module of claim 32, wherein, The second insulating part and / or the first insulating part has conductive particles, and the distance between the first conductive layer, the second conductive layer, the first collecting electrode and the second collecting electrode and the conductive particles is greater than 10 μm.

39. The photovoltaic module of claim 33, wherein, The confluence part and the electrical connector are provided with an auxiliary connecting block, the battery base has conductive particles near the auxiliary connecting block, and the maximum distance between the conductive particles and the auxiliary connecting block is less than 30 mm; and / or, the size of the auxiliary connecting block is less than 2000 μm.

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