Solar cell and photovoltaic module

Abstract

The invention discloses a solar cell and a photovoltaic module, and the solar cell comprises a cell substrate and an insulating part, the back surface of the cell substrate is provided with conductive layers and current collection electrodes, an isolation region is arranged between a first conductive layer and a second conductive layer which are adjacent, the first current collection electrode is provided with a first tandem part, and the second current collection electrode is provided with a second tandem part; the insulating part comprises first insulating parts and second insulating parts, and the first insulating parts are arranged at the positions, corresponding to the second tandem parts, of the first conductive layer and the second conductive layer respectively, and the positions, corresponding to the first tandem parts, of the second conductive layer; the second insulating parts are arranged on the two sides of the first insulating part in the second direction; the second insulating part covers the conductive layer and the collector electrode on two sides of the first insulating part along the second direction. The second insulation part is used for forming insulation isolation between the first conductive layer and the second conductive layer in the non-electric connecting piece connecting area, and the risk of short circuit of the solar cell is reduced.

Description

[0001] This application claims the priority of the Chinese patent application filed with the China Patent Office on July 19, 2024, with application number 202421724193.0 and invention name “A solar cell and photovoltaic module”, the entire contents of which are incorporated by reference in this application. Technical Field

[0002] The present application belongs to the field of photovoltaic technology, and specifically relates to a solar cell and a photovoltaic module. Background Art

[0003] In the existing back-contact battery, a first semiconductor layer and a second semiconductor layer are alternately arranged on the back side of a silicon substrate, and the first semiconductor layer and the second semiconductor layer are partially overlapped or overlapped. Usually, a laser or etching process is used to etch the overlapping part of the first semiconductor layer and the second semiconductor layer to form an isolation region to insulate and isolate the first semiconductor layer from the second semiconductor layer.

[0004] However, during the subsequent welding process, when conductive foreign matter such as tin slag falls between the two semiconductor layers, the first semiconductor layer and the second semiconductor layer will be conductive, thereby causing leakage problems. Summary of the invention

[0005] The present application aims to provide a solar cell and a photovoltaic module, which can solve the problem in existing batteries that conductive foreign matter such as tin slag produced by the welding process easily falls between two semiconductor layers, causing battery leakage.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides a solar cell, comprising: a cell substrate, a conductive layer and a collector electrode are provided on the back of the cell substrate, the conductive layer comprises a first conductive layer and a second conductive layer of opposite conductivity types and arranged alternately along a first direction, an isolation region is provided between adjacent first conductive layers and second conductive layers, the collector electrode comprises a first collector electrode provided on the first conductive layer and a second collector electrode provided on the second conductive layer, the first collector electrode is provided with a first connecting portion, and the second collector electrode is provided with a second connecting portion;

[0008] An insulating member, comprising a first insulating portion and a second insulating portion, wherein the first insulating portion is provided at a position of the first conductive layer corresponding to the second connecting portion and the second conductive layer is provided at a position corresponding to the first connecting portion;

[0009] The second insulating portion is arranged on both sides of the first insulating portion along a second direction, and the second direction intersects with the first direction; the second insulating portion covers the conductive layer on both sides of the first insulating portion along the second direction and the collector electrodes thereon.

[0010] In a second aspect, an embodiment of the present application provides a solar cell, comprising:

[0011] A battery substrate, wherein a conductive layer and a collector electrode are provided on the back of the battery substrate, wherein the conductive layer comprises a first conductive layer and a second conductive layer having opposite conductive types and arranged alternately along a first direction, and an isolation region is provided between adjacent first conductive layers and second conductive layers, and the collector electrode comprises a first collector electrode provided on the first conductive layer and a second collector electrode provided on the second conductive layer, wherein the first collector electrode is provided with a first connecting portion, and the second collector electrode is provided with a second connecting portion;

[0012] An insulating member, comprising a first insulating portion and a second insulating portion, wherein the first insulating portion is provided at a position of the first conductive layer corresponding to the second connecting portion and the second conductive layer is provided at a position corresponding to the first connecting portion;

[0013] The second insulating portion is disposed on both sides of the first insulating portion along a second direction intersecting the first direction; the second insulating portion covers an isolation region between the first conductive layer and the second conductive layer and protrudes from the first insulating portion in the second direction.

[0014] In a third aspect, an embodiment of the present application provides a photovoltaic module, comprising any solar cell described above.

[0015] In an embodiment of the present application, a first conductive layer and a second conductive layer of opposite electrical types and arranged alternately at intervals are provided on the back of the battery substrate, and a first insulating portion is further provided on the first conductive layer and the second conductive layer, so that when the first collector electrode or the second collector electrode is connected in series by an electrical connector, the first insulating portion can serve to insulate and isolate the electrical connector from the opposite conductive layer and the collector electrode. At the same time, a second insulating portion is provided on both sides of the first insulating portion, so that the second insulating portion covers the isolation area between the first conductive layer and the second conductive layer, and / or the second insulating portion covers the conductive layer and the collector electrode on both sides of the first insulating portion. In this way, the second insulating portion can serve to insulate and isolate the first conductive layer and the second conductive layer in the non-electrical connector connection area, avoid conduction between the first conductive layer and the second conductive layer through conductive foreign matter such as welding slag, and thus reduce the risk of short circuiting of the solar cell.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram of a solar cell according to an embodiment of the present application;

[0019] Figure 2 is along Figure 1 Sectional view along line AA;

[0020] Figure 3 is a schematic diagram of another solar cell according to an embodiment of the present application;

[0021] Figure 4 is along Figure 3 Sectional view of the middle BB line;

[0022] Figure 5 is along Figure 3 Section view of the mid-CC line;

[0023] Figure 6 is a schematic diagram of another solar cell according to an embodiment of the present application;

[0024] Figure 7 is along Figure 6 Sectional view of the mid-DD line;

[0025] Figure 8 is along Figure 6 Cross-section along line EE.

[0026] Reference numerals:

[0027] 10: battery substrate; 11a: first semiconductor region; 11: first conductive layer; 12a: second semiconductor region; 12: second conductive layer; 13: isolation region; 14: first collecting electrode; 14a: first connecting portion; 15: second collecting electrode; 15a: second connecting portion; 16: first bus bar; 17: second bus bar; 20: insulating member; 21: first insulating portion; 22: second insulating portion; 40: suede layer; 50: anti-reflection layer; X: first direction; Y: second direction. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0029] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] The solar cell and photovoltaic module provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0033] like Figure 6 to Figure 7 As shown, a solar cell according to an embodiment of the present application includes: a cell substrate 10 and an insulating member 20, a conductive layer and a collecting electrode are provided on the back side of the cell substrate 10, the conductive layer includes a first conductive layer 11 and a second conductive layer 12 of opposite conductivity types and arranged alternately along a first direction X, an isolation region 13 is provided between adjacent first conductive layers 11 and second conductive layers 12, the collecting electrode includes a first collecting electrode 14 provided on the first conductive layer 11 and a second collecting electrode 15 provided on the second conductive layer 12, the first collecting electrode 14 is provided with a first connecting portion 14a, and the second collecting electrode 15 is provided with a second connecting portion 15a.

[0034] Among them, the insulating part 20 includes a first insulating part 21 and a second insulating part 22. The first insulating part 21 is provided at a position of the first conductive layer 11 corresponding to the second connecting part 15a, and the second conductive layer 12 is provided at a position corresponding to the first connecting part 14a; the second insulating part 22 is provided on both sides of the first insulating part 21 along the second direction Y, and the second direction Y intersects with the first direction X; the second insulating part 22 covers the conductive layer on both sides of the first insulating part 21 along the second direction Y and the collecting electrodes thereon.

[0035] In the embodiment of the present application, the back of the battery substrate 10 is provided with a first conductive layer 11 and a second conductive layer 12 of opposite electrical types and arranged alternately at intervals, and then a first insulating portion 21 is arranged on the first conductive layer 11 and the second conductive layer 12, so that when the first collector electrode 14 or the second collector electrode 15 is connected in series by an electrical connector, the first insulating portion 21 can play the role of insulating and isolating the electrical connector from the opposite conductive layer and the collector electrode. At the same time, a second insulating portion 22 is arranged on both sides of the first insulating portion 21, so that the second insulating portion 22 covers the conductive layer on both sides of the first insulating portion 21 and the collector electrode thereon. In this way, the second insulating portion 22 can be used to insulate and isolate the first conductive layer 11 and the second conductive layer 12 in the non-electrical connector connection area, and avoid the first conductive layer 11 and the second conductive layer 12 from being connected through conductive foreign matter such as welding slag, thereby reducing the risk of short circuiting of the solar cell. At the same time, the insulation effect of the first and second conductive layers can be improved, and the overall processing and preparation of the insulating member 20 is also convenient.

[0036] Specifically, if Figure 7 As shown, the solar cell includes a cell substrate 10, the cell substrate 10 has a front side and a back side opposite to each other, the front side is the side receiving sunlight, and the front side of the cell substrate 10 may be provided with a velvet layer 40 and an anti-reflection layer 50 to improve the light absorption rate of the front side of the cell substrate 10. Figure 6 As shown, the back of the battery substrate 10 has a first direction X and a second direction Y intersecting each other, and the back of the battery substrate 10 is provided with a first conductive layer 11 and a second conductive layer 12 alternately arranged along the first direction X, and an isolation region 13 is provided between adjacent first conductive layers 11 and second conductive layers 12 to separate the first conductive layers 11 and the second conductive layers 12. Preferably, the second direction Y is perpendicular to the first direction X.

[0037] The first conductive layer 11 is provided with a first collector electrode 14 extending along the second direction Y, and the second conductive layer 12 is provided with a second collector electrode 15 extending along the second direction Y. Along the second direction Y, the first collector electrode 14 is provided with a plurality of first collector portions 14a arranged at intervals, and the second collector electrode 15 is provided with a plurality of second collector portions 15a arranged at intervals, and the projections of the first collector portions 14a and the second collector portions 15a on a plane perpendicular to the first direction X do not overlap.

[0038] Furthermore, the electrical connector can be used to electrically connect the first connecting parts 14a of multiple first collecting electrodes 14 simultaneously along the first direction X to achieve current convergence of the multiple first collecting electrodes 14, and the electrical connector can be used to electrically connect the second connecting parts 15a of multiple second collecting electrodes 15 simultaneously along the first direction X to achieve current convergence of the multiple second collecting electrodes 15.

[0039] Among them, the electrical connector connected to the first connecting portion 14a is the first electrical connector, and the first insulating portion 21 needs to be used for insulation isolation between the first electrical connector and the second conductive layer 12 and the second collector electrode 15 to avoid short circuit between the first electrical connector and the second conductive layer 12 and the second collector electrode 15. Correspondingly, the electrical connector connected to the second connecting portion 15a is the second electrical connector, and the first insulating portion 21 needs to be used for insulation isolation between the second electrical connector and the first conductive layer 11 and the first collector electrode 14 to avoid short circuit between the second electrical connector and the first conductive layer 11 and the first collector electrode 14.

[0040] It should be understood that the first connecting portion 14a is a portion of the first collector electrode 14 used to connect to the first electrical connector. The second connecting portion 15a is a portion of the second collector electrode 15 used to connect to the second electrical connector. The first connecting portion 14a and the second connecting portion 15a may be regions on the collector electrode used for electrical connection, or may be widened portions provided on the collector electrode, or may be pads provided on the collector electrode for connecting to electrical connectors.

[0041] It can be understood that during the operation of the solar cell, the carriers generated by the conversion of the battery substrate 10 can be collected by the first collecting electrode 14 and the second collecting electrode 15. Then, by connecting the first collecting electrode 14 or the second collecting electrode 15 in series through an electrical connector, the carriers collected by each collecting electrode can be converged and led out of the solar cell.

[0042] In some embodiments, Figure 6 As shown, along the second direction Y, the second insulating portion 22 is provided on both sides of the first insulating portion 21, that is, Figure 6 In the embodiment, the second insulating portion 22 is respectively provided on the left and right sides of the first insulating portion 21, wherein the dotted line indicates the boundary position between the first insulating portion 21 and the second insulating portion 22. Then, the second insulating portion 22 covers the first insulating portion 21 on both sides along the second direction Y (i.e. Figure 6 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.

[0043] It can be understood that the corresponding position between the first conductive layer 11 and the second connecting portion 15a refers to an area on the first conductive layer 11 that at least partially overlaps with the orthographic projection of the second connecting portion 15a in the first direction X; the corresponding position between the second conductive layer 12 and the first connecting portion 14a refers to an area on the second conductive layer 12 that at least partially overlaps with the orthographic projection of the first connecting portion 14a in the first direction X.

[0044] In some embodiments, the collector electrode can be made of a metal conductive material, and illustratively, the collector electrode can be a silver electrode, a copper electrode, an alloy electrode, or a multilayer metal electrode, etc. Of course, the collector electrode can also be made of other materials and can be flexibly set according to actual conditions, and this application does not limit it here.

[0045] It is understandable that in a solar cell, the collector electrode forms an ohmic connection with the cell substrate 10 , and the collector electrode is made of a metal conductive material with good conductivity, which can improve the ability of the collector electrode to collect carriers.

[0046] In some embodiments, Figure 6 As shown, the second insulating portion 22 covers the conductive layer and the collector electrodes thereon on both sides of the first insulating portion 21 along the second direction Y, and the second insulating portion 22 at least partially covers the sidewalls of the conductive layer adjacent to the isolation region 13 .

[0047] In the embodiment of the present application, while the second insulating portion 22 covers the conductive layer and the 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 side wall of the conductive layer adjacent to the isolation region 13, so as to increase the coverage area of ​​the conductive layer by the second insulating portion 22, which helps to improve the insulating isolation effect of the second insulating portion 22 and further reduce the risk of short circuit between the first conductive layer 11 and the second conductive layer 12.

[0048] In some embodiments, a second insulating portion 22 is provided on both sides of the first insulating portion 21 on the first conductive layer 11, and the second insulating portion 22 covers the first conductive layer 11 and the first collecting electrode 14 on both sides of the first insulating portion 21, and the second insulating portion 22 extends in the first direction X to cover the side walls of the first conductive layer 11 adjacent to the isolation region 13.

[0049] In other embodiments, a second insulating portion 22 is provided on both sides of the first insulating portion 21 on the second conductive layer 12, and the second insulating portion 22 covers the second conductive layer 12 and the second collecting electrode 15 on both sides of the first insulating portion 21, and the second insulating portion 22 extends in the first direction X to cover the side walls of the second conductive layer 12 adjacent to the isolation region 13.

[0050] In some embodiments, Figure 7 and Figure 8As shown, the second insulating portion 22 at least partially covers the adjacent isolation region 13 .

[0051] In the embodiment of the present application, while the second insulating portion 22 covers the conductive layer and the 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 region 13, so that the second insulating portion 22 is used to simultaneously form insulation isolation for the conductive layer and its adjacent isolation region 13, which can ensure that the second insulating portion 22 completely covers the corresponding conductive layer, further reducing the probability of contact between welding slag and the conductive layer, and can further enhance the insulation isolation effect 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.

[0052] In some embodiments, the second insulating portion 22 at least partially covers another adjacent conductive layer of the opposite conductive type.

[0053] In the embodiment of the present application, while the second insulating portion 22 covers the conductive layer and the collector electrode on both sides of the first insulating portion 21 along the second direction Y, the second insulating portion 22 extends to cover another adjacent conductive layer of the opposite conductive type in the first direction X. In this way, the coverage area of ​​the second insulating portion 22 can be increased, and when the second insulating portion 22 on one conductive layer covers less, the second insulating portion 22 on the adjacent conductive layer can be appropriately supplemented, thereby enhancing the insulating isolation effect of the second insulating portion 22 between the first conductive layer 11 and the second conductive layer 12, and reducing the risk of short circuit between the first conductive layer 11 and the second conductive layer 12 due to conductive foreign matter such as welding slag.

[0054] When the first insulating portion 21 is disposed on the first conductive layer 11, the second insulating portions 22 on both sides of the first insulating portion 21 extend to cover the isolation region 13 adjacent to the first conductive layer 11 and a portion of the second conductive layer 12. Correspondingly, when the first insulating portion 21 is disposed on the second conductive layer 12, the second insulating portion 22 extends to cover the isolation region 13 adjacent to the second conductive layer 12 and a portion of the first conductive layer 11.

[0055] It should be understood that the second insulating portion 22 on the first conductive layer 11 and the second conductive layer 12 may completely cover the first conductive layer 11 , the second conductive layer 12 and the isolation region 13 outside the connecting portion to achieve better short circuit prevention.

[0056] In some embodiments, Figure 7 As shown, 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, the interval between two adjacent first collector electrodes 14 is H2, and the second insulating portion 22 covering the second conductive layer 12 satisfies: W2-20μm≤D12≤H2.

[0057] In the embodiment of the present application, the width D12 of the second insulating portion 22 is set to be 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 at the same time, it can allow a certain process error to cover most of the width of the second conductive layer 12, and then the second insulating portion 22 is used to form a shielding and isolation on the surface of the second conductive layer 12, so as to prevent the adjacent first conductive layer 11 and the second conductive layer 12 from being connected due to conductive foreign matter such as welding slag. At the same time, the width D12 of the second insulating portion 22 is set to be less than or equal to the spacing H2 between two adjacent first collector electrodes 14, so that the second insulating portion 22 is used to shield and cover the area between the two adjacent first collector electrodes 14.

[0058] In some embodiments, Figure 8 As shown, the width of the first conductive layer 11 is W3, the distance between two adjacent second collector electrodes 15 is H3, and the second insulating portion 22 covering the first conductive layer 11 satisfies: W3-20 μm≤D12≤H3.

[0059] In the embodiment of the present application, by setting the width D12 of the second insulating portion 22 to be greater than or equal to W3-20μm, the second insulating portion 22 at least partially covers the first conductive layer 11, and can cover most of the width of the first conductive layer 11 under certain process errors, and then use the second insulating portion 22 to form a shielding isolation on the surface of the first conductive layer 11, so as to prevent the adjacent first conductive layer 11 and the second conductive layer 12 from being connected due to conductive foreign matter such as welding slag. At the same time, the width D12 of the second insulating portion 22 is set to be less than or equal to the spacing H3 between two adjacent second collector electrodes 15, so that the second insulating portion 22 can be used to shield and cover the area between two adjacent first collector electrodes 14.

[0060] In some embodiments, Figure 6 As shown, the second insulating portion 22 on the first conductive layer 11 is at least partially connected to 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 can be ensured, thereby ensuring 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.

[0061] In some embodiments, Figure 1 , Figure 3 and Figure 6As shown, the second insulating portion 22 on the first conductive layer 11 is at least partially connected to 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, thereby ensuring 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. When the second insulating portions 22 on the first conductive layer 11 and the second conductive layer 12 are at least partially connected in the first direction X and at least partially connected in the second direction Y, at this time, along the extension direction of the conductive layer, there is no short-circuited gap between the adjacent first conductive layers 11 and the second conductive layers 12, which can further reduce the risk of short circuit.

[0062] 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. Thus, while ensuring that the second insulating portion 22 forms an insulation isolation between the first conductive layer 11 and the second conductive layer 12, the amount of material used to prepare the second insulating portion 22 can be appropriately saved, the production cost can be saved, and the warping of the solar cell can be reduced.

[0063] In some embodiments, Figure 1 , Figure 3 and Figure 6 As shown, along the second direction Y, 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, and / or, along the second direction Y, 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.

[0064] It is understandable that when the electrical connector is used to connect the first connecting parts 14a of the plurality of first collector electrodes 14 in series, or when the electrical connector is used to connect the second connecting parts 15a of the plurality of second collector electrodes 15 in series, the position of the electrical connector may have a certain deviation. Furthermore, in the present application, by setting the width of the first insulating part 21 on the second conductive layer 12 to be greater than the width of the first connecting part 14a, or setting the width of the first insulating part 21 on the first conductive layer 11 to be greater than the width of the second connecting part 15a, the precision limit on the connection operation is reduced, the actual processing operation is facilitated, and at the same time, the insulation isolation function of the first insulating part 21 can be ensured.

[0065] Alternatively, if Figure 6 As shown, the widths of the second insulating portion 22 on the first conductive layer 11 and the second insulating portion 22 on the second conductive layer 12 along the first direction X are not equal.

[0066] It is understandable that the structural design of the solar cell requires that there is a difference in width between the first conductive layer 11 and the second conductive layer 12 in the first direction X, and then the width of the corresponding second insulating part 22 is reasonably set according to the width of the first conductive layer 11 and the second conductive layer 12 to better meet the insulation isolation requirements of different conductive layers.

[0067] The width of the second insulating portion 22 along the first direction X may be determined according to the width of the conductive layer covered by the second insulating portion 22 . The specific width may be flexibly set according to actual conditions and is not limited here.

[0068] like Figures 1 to 5 As shown, in some embodiments, the solar cell of the present application includes: a battery substrate 10 and an insulating member 20, the back side of the battery substrate 10 is provided with a conductive layer and a collecting electrode, the conductive layer includes a first conductive layer 11 and a second conductive layer 12 of opposite conductivity types and arranged alternately along a first direction X, an isolation region 13 is provided between adjacent first conductive layers 11 and second conductive layers 12, the collecting electrode includes a first collecting electrode 14 provided on the first conductive layer 11 and a second collecting electrode 15 provided on the second conductive layer 12, the first collecting electrode 14 is provided with a first connecting portion 14a, and the second collecting electrode 15 is provided with a second connecting portion 15a.

[0069] Among them, the insulating member 20 includes a first insulating portion 21 and a second insulating portion 22. The first insulating portion 21 is provided at a position corresponding to the second connecting portion 15a of the first conductive layer 11 and at a position corresponding to the first connecting portion 14a of the second conductive layer 12; the second insulating portion 22 is provided on both sides of the first insulating portion 21 along the second direction Y, and the second direction Y intersects with the first direction X; the second insulating portion 22 covers the isolation area 13 between the first conductive layer 11 and the second conductive layer 12 and the second insulating portion 22 protrudes from the first insulating portion 21 in the second direction Y.

[0070] In the embodiment of the present application, the back of the battery substrate 10 is provided with a first conductive layer 11 and a second conductive layer 12 of opposite electrical types and arranged alternately at intervals, and then a first insulating portion 21 is provided on the first conductive layer 11 and the second conductive layer 12, so that when the first collector electrode 14 or the second collector electrode 15 is connected in series by an electrical connector, the first insulating portion 21 can play the role of insulating and isolating the electrical connector from the opposite conductive layer or the collector electrode. At the same time, a second insulating portion 22 is provided on both sides of the first insulating portion 21, so that the second insulating portion 22 covers the isolation area 13 between the first conductive layer 11 and the second conductive layer 12 and the second insulating portion 22 protrudes from the first insulating portion 21 in the second direction Y. In this way, the second insulating portion 22 can be used to insulate and isolate the first conductive layer 11 and the second conductive layer 12 in the non-electrical connector connection area, avoid the first conductive layer 11 and the second conductive layer 12 from being connected through conductive foreign matter such as welding slag, thereby reducing the risk of short circuit of the solar cell. At the same time, the structural design of the insulating member 20 of the present application can save materials for preparing the insulating member 20 and can reduce the problem of warping of solar cells.

[0071] In some embodiments, Figure 1 and Figure 3 As shown, along the second direction Y, the second insulating portion 22 is provided on both sides of the first insulating portion 21, that is, Figure 1 and Figure 3 In the figure, the second insulating part 22 is respectively arranged on the left and right sides of the first insulating part 21, wherein the dotted line indicates the boundary position between the first insulating part 21 and the second insulating part 22. Furthermore, the second insulating part 22 covers the isolation area 13 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 13, and prevent conductive foreign matter such as welding slag from falling into the isolation area 13 during subsequent processing, thereby causing conduction between the first conductive layer 11 and the second conductive layer 12.

[0072] In some embodiments, Figures 1 to 5 As shown, the second insulating portion 22 covers the isolation region 13 between the first conductive layer 11 and the second conductive layer 12, and the second insulating portion 22 covers at least a portion of the first conductive layer 11 in the first direction X, and / or the second insulating portion 22 covers at least a portion of the second conductive layer 12 in the first direction X.

[0073] In the embodiment of the present application, while the second insulating portion 22 covers the isolation region 13 between the first conductive layer 11 and the second conductive layer 12, the second insulating portion 22 is extended to the first conductive layer 11 and / or the second conductive layer 12 on both sides of the isolation region 13 in the first direction X, so that the second insulating portion 22 covers at least a portion of the exposed first conductive layer 11 and / or the second conductive layer 12. In this way, the insulating isolation effect of the second insulating portion 22 between the first conductive layer 11 and the second conductive layer 12 can be enhanced, thereby further reducing the risk of short circuit between the first conductive layer 11 and the second conductive layer 12.

[0074] In some embodiments, Figure 4 As shown, along the first direction X, the width of the second insulating portion 22 is D11, the width of the isolation region 13 is W1, and the interval between adjacent first collector electrodes 14 and second collector electrodes 15 is H1, satisfying: W1-20 μm≤D11≤H1.

[0075] In the embodiment of the present application, while the second insulating portion 22 covers the isolation region 13 between the first conductive layer 11 and the second conductive layer 12, the width D11 of the second insulating portion 22 is set to be greater than or equal to W1-20 μm, so that the second insulating portion 22 covers the isolation region 13, thereby preventing conductive foreign matter such as welding slag from falling into the isolation region 13 and causing the first conductive layer 11 and the second conductive layer 12 on both sides of the isolation region 13 to be short-circuited, and at the same time, most of the width of the isolation region 13 can be covered under certain process errors. At the same time, by setting the width D11 of the second insulating portion 22 to be less than or equal to the spacing H1 between the adjacent first collector electrode 14 and the second collector electrode 15, the isolation effect and preparation cost of the second insulating portion 22 can be taken into account.

[0076] In some embodiments, Figure 3 As shown, when the second insulating portion 22 covers the isolation region 13, along the second direction Y, the length of the second insulating portion 22 is L, which satisfies: 2.5 mm ≤ L ≤ 10 mm. Specifically, the length L of the second insulating portion 22 can be set to any value or a range between any two values ​​such as 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.

[0077] In the embodiment of the present application, by setting a reasonable value range of the length L of the second insulating portion 22 along the second direction Y, it is ensured that the second insulating portion 22 can form an effective insulating isolation between the adjacent first conductive layer 11 and the second conductive layer 12, while avoiding waste caused by the second insulating portion 22 being too long.

[0078] In some embodiments, along the second direction Y, between adjacent first connecting portions 14a and second connecting portions 15a, the length of the second insulating portion 22 accounts for 30%-95% of the shortest distance between adjacent first connecting portions 14a and second connecting portions 15a. Specifically, the ratio of the length of the second insulating portion 22 to the shortest distance between adjacent first connecting portions 14a and second connecting portions 15a can be set to any value or a range between any two values, such as 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%.

[0079] In the embodiment of the present application, by setting the length of the second insulating part 22 to a ratio range of the shortest distance between the adjacent first connecting parts 14a and the second connecting parts 15a, the preparation cost of the second insulating part 22 can be saved while ensuring that the second insulating part 22 forms an effective insulating isolation effect on the area between the adjacent first connecting parts 14a and the second connecting parts 15a.

[0080] In some embodiments, Figure 1 , Figure 3 and Figure 6 As shown, the second insulating portion 22 can be designed in the manner of any of the above embodiments. The first insulating portion 21 also covers the isolation region 13. By arranging the first insulating portion 21 on the first conductive layer 11 or the second conductive layer 12, and extending the first insulating portion 21 to cover the adjacent isolation region 13, the coverage area of ​​the first insulating portion 21 is increased, so that when the first collector electrode 14 or the second collector electrode 15 is connected in series by an electrical connector, the problem of short circuit between the electrical connector and the conductive layer of opposite sex can be effectively avoided.

[0081] In some embodiments, Figure 1 , Figure 3 and Figure 6 As shown, the first insulating portion 21 also covers the isolation region 13 and the exposed conductive layer adjacent to the isolation region 13 .

[0082] It is understandable that in a specific application, since the position where the first insulating portion 21 is provided on the conductive layer is closer to the connection position between the collector electrode and the electrical connector, the risk of conductive foreign matter such as welding slag is higher. Therefore, by providing the first insulating portion 21 on the first conductive layer 11 or the second conductive layer 12, and making the first insulating portion 21 cover the isolation region 13 and the exposed conductive layer adjacent to the isolation region 13, the insulating isolation function of the first insulating portion 21 can be further improved.

[0083] In some embodiments, on the solar cell, the width of the isolation region is 30 μm-600 μm. The width of the isolation region is relatively large compared to the welding slag. Even if there are holes or weak positions in the second insulating part, the wider isolation region can reduce the risk of short circuit between the first conductive layer 11 and the second conductive layer 12. In other words, the isolation region 13 improves the problem of welding slag short circuit from the dimension of physical distance.

[0084] Specifically, the width of the isolation region can be set to any value such as 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.

[0085] An embodiment of the present application also provides a photovoltaic assembly, including: the solar cell in any of the above embodiments.

[0086] In the embodiment of the present application, the back of the battery substrate 10 is provided with a first conductive layer 11 and a second conductive layer 12 of opposite electrical types and arranged alternately at intervals, and then a first insulating portion 21 is provided on the first conductive layer 11 and the second conductive layer 12, so that when the first collector electrode 14 or the second collector electrode 15 is connected in series by an electrical connector, the first insulating portion 21 can play the role of insulating and isolating the electrical connector from the opposite conductive layer and the collector electrode. At the same time, a second insulating portion 22 is provided on both sides of the first insulating portion 21, so that the second insulating portion 22 covers the isolation area 13 between the first conductive layer 11 and the second conductive layer 12, and / or the second insulating portion 22 covers the conductive layer and the collector electrode on both sides of the first insulating portion 21. In this way, the second insulating portion 22 can be used to insulate and isolate the first conductive layer 11 and the second conductive layer 12 in the non-electrical connector connection area, avoid the first conductive layer 11 and the second conductive layer 12 from being connected through conductive foreign matter such as welding slag, thereby reducing the risk of short circuiting of the solar cell.

[0087] It should be noted that, in the above embodiments, the first insulating portion 21 may be continuous with the second insulating portion 22. Figure 1 , Figure 3 , Figure 6 As shown, at this time, the risk of conductive foreign matter such as welding slag falling into the gap between the first insulating part 21 and the second insulating part 22, causing a short circuit in an abnormal situation, can be avoided. There can also be a gap between the first insulating part 21 and the second insulating part 22 (not shown in the drawings), which can not only save consumables of the insulating part, but also facilitate the independent setting and independent production of the first and second insulating parts.

[0088] Optionally, the photovoltaic assembly further comprises an electrical connector, the solar cells are provided in plurality, and the electrical connector is electrically connected to the connecting portion of the collector electrodes in the solar cells. Furthermore, the plurality of solar cells can be connected in series to form a battery string through the electrical connector.

[0089] In some embodiments, the solar cell may be a battery without a busbar, and the electrical connector is directly electrically connected to the busbar of the collector electrode on the battery substrate 10. Specifically, the electrical connector may include a first electrical connector and a second electrical connector extending along the first direction X, wherein the first electrical connector may be electrically connected to the first busbars 14a of a plurality of first collector electrodes 14 at the same time, and a first insulating portion 21 is provided between the first electrical connector and the second collector electrode 15 for insulation isolation. The second electrical connector may be electrically connected to the second busbars 15a of a plurality of second collector electrodes 15 at the same time, and a first insulating portion 21 is provided between the second electrical connector and the first collector electrode 14 for insulation isolation.

[0090] In other embodiments, the solar cell may be a cell with a busbar, and the surface of the solar cell is also provided with a busbar, and the portion where the busbar intersects with the collector electrode is a busbar, and the electrical connector is used to connect the busbar to achieve electrical connection of multiple solar cells. It should be understood that the busbar may be an electrode with a busbar function provided on the surface of the solar cell, and the electrode with a busbar function may be a whole electrode, an electrode divided into multiple segments, or an electrode segment provided at both ends of the cell. The busbar may also be a busbar formed of a conductive material such as a tin alloy material on the surface of the solar cell. The busbar may also be other forms of components with a busbar function.

[0091] Specifically, Figure 1 As shown, the busbar includes a first busbar 16 and a second busbar 17 extending along the first direction X, the first busbar 16 is electrically connected to the first busbars 14a of the plurality of first collector electrodes 14 at the same time, and a first insulating portion 21 is provided between the first busbar 16 and the second collector electrodes 15 for insulation isolation. The second busbar 17 is electrically connected to the second busbars 15a of the plurality of second collector electrodes 15 at the same time, and a first insulating portion 21 is provided between the second busbar 17 and the first collector electrodes 14 for insulation isolation. Furthermore, the busbars of the plurality of solar cells are connected in series by using an electrical connector, so that the electrical connection of the plurality of solar cells can be realized.

[0092] In some embodiments, an auxiliary connection block is provided between the connecting portion of the collector electrode and the electrical connector, and the height difference between the top surface of the auxiliary connection block and the top surface of the first insulating portion is less than or equal to 15 μm along the thickness direction of the battery matrix 10. The top surface of the auxiliary connection block and the top surface of the first insulating portion are the top surfaces away from the battery matrix 10, and the direction of the height is the thickness direction of the battery matrix 10. Exemplarily, the height difference between the two 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.

[0093] In the embodiment of the present application, an auxiliary connection block is provided between the collector electrode's connecting portion and the electrical connector, thereby assisting the connection between the collector electrode and the electrical connector, thereby improving the connection strength between the collector electrode and the electrical connector. In addition, the height difference between the top surface of the auxiliary connection block and the top surface of the first insulating portion is set within 15 μm, thereby avoiding the influence of the first insulating portion being set too high or too low on the connection operation of the electrical connector and the connecting portion.

[0094] The connecting part includes a first connecting part 14a on the first collecting electrode and a second connecting part 15a on the second collecting electrode. It should be noted that the connecting part of the collecting electrode can be a partial structure of the collecting electrode itself, or a component separately arranged on the collecting electrode for connecting with the electrical connector, and can be flexibly arranged according to actual conditions, and is not limited here.

[0095] In some embodiments, the auxiliary connection block may be an auxiliary connection piece disposed between the connecting portion of the collector electrode and the electrical connection piece, or may be an auxiliary connection layer disposed on the side of the electrical connection piece facing the collector electrode.

[0096] In some embodiments, Figure 2 and Figure 8 As shown, the thickness of the second insulating portion 22 is 20 μm-80 μm along the thickness direction of the battery substrate 10. For example, the thickness of the second insulating portion 22 can be set to any value such as 80 μm, 70 μm, 60 μm, 50 μm, 40 μm, 30 μm, 20 μm, or a range between any two values.

[0097] In some embodiments, Figure 2 and Figure 8 As shown, the thickness of the first insulating portion 21 is 20 μm-80 μm along the thickness direction of the battery substrate 10. For example, the thickness of the first insulating portion 21 can be set to any value such as 80 μm, 70 μm, 60 μm, 50 μm, 40 μm, 30 μm, 20 μm, or a range between any two values.

[0098] In the embodiment of the present application, the thickness of the first insulating part 21 and the second insulating part 22 in the insulating part 20 is set to ensure that when conductive foreign matter such as welding slag falls on the insulating part 20, the first insulating part 21 or the second insulating part 22 will not be pierced, causing the conductive foreign matter to pass through the insulating part 20 and short-circuit the conductive layer.

[0099] In some embodiments, along the second direction Y, the distance between the center line of the electrical connector and the center of the connecting portion 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.

[0100] The center line of the electrical connector refers to the geometric center line of the orthographic projection of the electrical connector on the back of the battery substrate 10 , and the center of the connecting portion refers to the geometric center point of the orthographic projection of the connecting portion on the back of the battery substrate 10 .

[0101] In the embodiment of the present application, the distance between the center line of the electrical connector and the center of the connecting part is set to be less than or equal to 2 mm to avoid excessive deviation of the connection position between the electrical connector and the connecting part, thereby preventing the electrical connector from exceeding the first insulating part 21 and short-circuiting with the conductive layer.

[0102] In some embodiments, the second insulating portion and / or the first insulating portion has conductive particles, and the minimum distance between the first conductive layer, the second conductive layer, the first collector electrode, and the second collector electrode and the conductive particles is greater than 10 μm. For example, the distance between the conductive particles and the conductive layer or the collector 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 (such as welding slag) and the conductive layer, the collector electrode and other conductive structures is relatively large, and the first insulating portion and the second insulating portion are isolated in the middle, which can further reduce the risk of short circuit.

[0103] In some embodiments, an auxiliary connection block is provided between the connection part and the electrical connector, and conductive particles are provided on the battery substrate 10 near the auxiliary connection block, and the maximum distance between the conductive particles and the auxiliary connection block is less than 30 mm; and / or the size of the auxiliary connection block is less than 2000 μm. Exemplarily, the maximum distance between the conductive particles and the auxiliary connection 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 connection block can be 2000 μm, 1800 μm, 1500 μm, 1200 μm, 1000 μm, 800 μm, etc.

[0104] In the implementation of the present application, the problem of excessive and large splashing of conductive particles (welding slag) caused by the auxiliary connecting block being too large can be improved by designing the size of the auxiliary connecting block, and the distance and amount of splashing of 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 the conductive particles splashing can be weakened, and the conductive particles can be prevented from piercing the first insulating portion 21 and the second insulating portion 22, thereby further reducing the risk of short circuit.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0106] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A solar cell, characterized in that: include: A battery substrate, wherein a conductive layer and a collector electrode are provided on the back of the battery substrate, wherein the conductive layer comprises a first conductive layer and a second conductive layer having opposite conductive types and arranged alternately along a first direction, and an isolation region is provided between adjacent first conductive layers and second conductive layers, and the collector electrode comprises a first collector electrode provided on the first conductive layer and a second collector electrode provided on the second conductive layer, wherein the first collector electrode is provided with a first connecting portion, and the second collector electrode is provided with a second connecting portion; An insulating member, comprising a first insulating portion and a second insulating portion, wherein the first insulating portion is provided at a position of the first conductive layer corresponding to the second connecting portion and the second conductive layer is provided at a position corresponding to the first connecting portion; The second insulating portion is arranged on both sides of the first insulating portion along a second direction, and the second direction intersects with the first direction; the second insulating portion covers the conductive layer on both sides of the first insulating portion along the second direction and the collector electrodes thereon.

2. The solar cell according to claim 1, characterized in that The second insulating portion covers the conductive layer and the collector electrodes thereon on both sides of the first insulating portion along the second direction, and the second insulating portion at least partially covers the side wall of the conductive layer adjacent to the isolation region.

3. The solar cell according to claim 2, characterized in that: The second insulating portion at least partially covers the adjacent isolation region.

4. The solar cell according to claim 3, characterized in that: The second insulating portion at least partially covers another adjacent conductive layer of opposite conductivity type.

5. The solar cell according to claim 1, characterized in that: Along the first direction, the width of the second insulating portion is D12, the width of the second conductive layer is W2, and the distance between two adjacent first collector electrodes is H2, satisfying: W2-20 μm≤D12≤H2; Or, the width of the first conductive layer is W3, and the distance between two adjacent second collector electrodes is H3, satisfying: W3-20 μm≤D12≤H3.

6. The solar cell according to any one of claims 1 to 5, characterized in that: The second insulating portion on the first conductive layer is at least partially connected to the second insulating portion on the adjacent second conductive layer in the first direction; and / or the second insulating portion on the first conductive layer is at least partially connected to the second insulating portion on the adjacent second conductive layer in the second direction; Alternatively, there is a gap between the second insulating portion on the first conductive layer and the second insulating portion on the adjacent second conductive layer.

7. The solar cell according to any one of claims 1 to 5, characterized in that: Along the second direction, the width of the first insulating portion on the second conductive layer is greater than the width of the first connecting portion; And / or, along the second direction, the width of the first insulating portion on the first conductive layer is greater than the width of the second connecting portion.

8. The solar cell according to any one of claims 1 to 5, characterized in that: The widths of the second insulating portion on the first conductive layer and the second insulating portion on the second conductive layer along the first direction are not equal.

9. A solar cell, characterized in that: include: A battery substrate, wherein a conductive layer and a collector electrode are provided on the back of the battery substrate, wherein the conductive layer comprises a first conductive layer and a second conductive layer having opposite conductive types and arranged alternately along a first direction, and an isolation region is provided between adjacent first conductive layers and second conductive layers, and the collector electrode comprises a first collector electrode provided on the first conductive layer and a second collector electrode provided on the second conductive layer, wherein the first collector electrode is provided with a first connecting portion, and the second collector electrode is provided with a second connecting portion; An insulating member, comprising a first insulating portion and a second insulating portion, wherein the first insulating portion is provided at a position of the first conductive layer corresponding to the second connecting portion and the second conductive layer is provided at a position corresponding to the first connecting portion; The second insulating portion is provided on both sides of the first insulating portion along a second direction, and the second direction intersects with the first direction; The second insulating portion covers an isolation region between the first conductive layer and the second conductive layer and protrudes from the first insulating portion in a second direction.

10. The solar cell according to claim 9, characterized in that: The second insulating portion covers an isolation region between the first conductive layer and the second conductive layer, and the second insulating portion covers at least a portion of the first conductive layer in the first direction, and / or the second insulating portion covers at least a portion of the second conductive layer in the first direction.

11. The solar cell according to claim 9, characterized in that: Along the first direction, the width of the second insulating portion is D11, the width of the isolation region is W1, and the distance between adjacent first collector electrodes and second collector electrodes is H1, satisfying: W1-20 μm≤D11≤H1.

12. The solar cell according to claim 1 or 9, characterized in that: Along the second direction, the length of the second insulating portion is L, satisfying: 2.5 mm ≤ L ≤ 10 mm; and / or, Along the second direction, between adjacent first connecting portions and second connecting portions, the length of the second insulating portion accounts for 30%-95% of the shortest distance between adjacent first connecting portions and second connecting portions.

13. The solar cell according to claim 1 or 9, characterized in that: The first insulating portion covers the isolation region, or the first insulating portion covers the isolation region and at least partially covers an exposed conductive layer adjacent to the isolation region.

14. The solar cell according to claim 1 or 9, characterized in that: The collector electrode is a silver electrode, a copper electrode, an alloy electrode or a multilayer metal electrode.

15. The solar cell according to claim 1 or 9, characterized in that: The width of the isolation region is 30 μm-600 μm.

16. A photovoltaic module, characterized in that: include: A solar cell as claimed in any one of claims 1 to 15.

17. The photovoltaic module according to claim 16, characterized in that: The photovoltaic assembly further includes an electrical connector, the solar cell is provided in a plurality, and the electrical connector is electrically connected to the connecting portion of the collector electrodes in the solar cell.

18. The photovoltaic module according to claim 17, characterized in that: A busbar is provided between the electrical connector and the busbar portion.

19. The photovoltaic module according to claim 17, characterized in that: An auxiliary connection block is provided between the connecting portion and the electrical connector, and a height difference between a top surface of the auxiliary connection block and a top surface of the first insulating portion is less than or equal to 15 μm.

20. The photovoltaic module according to claim 17, characterized in that: The thickness of the second insulating portion is 20 μm-80 μm; and / or the thickness of the first insulating portion is 20 μm-80 μm.

21. The photovoltaic module according to claim 17, characterized in that: Along the second direction, a distance between a center line of the electrical connector and a center of the connecting portion is less than or equal to 2 mm.

22. The photovoltaic module according to claim 16, characterized in that: Conductive particles are disposed on the second insulating portion and / or the first insulating portion, and the distances between the first conductive layer, the second conductive layer, the first collector electrode, the second collector electrode and the conductive particles are all greater than 10 μm.

23. The photovoltaic module according to claim 17, characterized in that: An auxiliary connection block is provided between the connecting portion and the electrical connector, conductive particles are provided on the battery substrate near the auxiliary connection block, and the maximum distance between the conductive particles and the auxiliary connection block is less than 30 mm; and / or the size of the auxiliary connection block is less than 2000 μm.

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