Photovoltaic module

Abstract

The embodiment of the present disclosure relates to the photovoltaic field, and provides a photovoltaic module, comprising: a plurality of cell strings, the cell string comprising two sub-cell strings arranged at intervals along a first direction and connected in series with each other, the plurality of cell strings being arranged at intervals along the first direction and the second direction, two cell strings arranged at intervals along the second direction being connected in parallel to form a cell module; a bus bar provided with a bypass diode corresponding to the cell module one by one, at least two cell modules arranged at intervals along the first direction being connected in series through the bus bar; a first connecting part and a second connecting part arranged at intervals along the second direction, in the same cell module, two sub-cell strings of one cell string being connected in series through the first connecting part, and two sub-cell strings of another cell string being connected in series through the second connecting part; and an electrical connection structure electrically connected with the first connecting part and the second connecting part at two ends. The embodiment of the present disclosure is at least beneficial to reduce the risk of hot spot to improve the reliability of the photovoltaic module, and improve the power generation of the photovoltaic module.

Description

TECHNICAL FIELD

[0001] The embodiments of the present disclosure relate to the field of photovoltaics, and in particular to a photovoltaic module. BACKGROUND

[0002] A photovoltaic module is a core part of a solar power generation system. In the photovoltaic module, a solar cell is easily affected by partial shadow formed by surrounding buildings and the like, thereby causing the power generation efficiency of the photovoltaic module to decrease. Meanwhile, the solar cell affected by the shadow can also appear a "hot spot effect" due to local overheating. In this way, not only the aging process of the solar cell will be accelerated, the service life of the photovoltaic module will be shortened, but also the solar cell will be burned out in severe cases, affecting the safety of the photovoltaic module. In order to weaken the negative effects of the partial shadow on the power generation efficiency and safety of the photovoltaic module, the most important measure currently adopted is to configure a diode in the photovoltaic module.

[0003] However, with the increase of the cell efficiency, the pressure of simply relying on the diode to resist the hot spot effect of the solar cell is increased. SUMMARY

[0004] The embodiments of the present disclosure provide a photovoltaic module, which at least helps to reduce the hot spot risk to improve the reliability of the photovoltaic module, and to improve the power generation of the photovoltaic module.

[0005] According to some embodiments of the present disclosure, a photovoltaic module is provided, comprising: a plurality of cell strings, the cell string comprising two sub-cell strings arranged in a first direction and connected in series with each other, wherein the plurality of cell strings are arranged in the first direction and the second direction, and two cell strings arranged in the second direction are connected in parallel with each other to form a cell module, and the first direction and the second direction intersect; a bus bar, the bus bar being provided with a bypass diode corresponding to the cell module one by one, and at least two cell modules arranged in the first direction are connected in series through the bus bar in turn; a first connecting portion and a second connecting portion arranged in the second direction, in the same cell module, two sub-cell strings of one cell string are connected in series through the first connecting portion, and two sub-cell strings of another cell string are connected in series through the second connecting portion; and an electrical connection structure, the electrical connection structure having opposite first and second ends in the second direction, the first end being electrically connected to the first connecting portion, and the second end being electrically connected to the second connecting portion.

[0006] In some embodiments, a transmission path of the current in the first connecting portion is a first transmission path, a transmission path of the current in the second connecting portion is a second transmission path, and a transmission path of the current in the electric connection structure is a third transmission path; the first transmission path has a transmission resistance smaller than that of the third transmission path, and the second transmission path has a transmission resistance smaller than that of the third transmission path.

[0007] In some embodiments, the two battery strings in the same battery module are a first battery string and a second battery string respectively; the bypass diode corresponding to the battery module is reversely connected in series between the positive electrode and the negative electrode of the first battery string and reversely connected in series between the positive electrode and the negative electrode of the second battery string.

[0008] In some embodiments, the bus bar comprises first segments and second segments alternately arranged and interconnected along the first direction, the second segments correspond to the battery modules one by one, and the bypass diode is arranged on the second segments; the photovoltaic assembly further comprises an insulation structure, which is located at least between part of the second segments and the electric connection structure.

[0009] In some embodiments, the first segments and the electric connection structure are in the same layer, part of the second segments are located between the first segments and the electric connection structure, the remaining second segments are in different layers from the first segments, and the second segments located between the first segments and the electric connection structure have a spacing from the electric connection structure, and the insulation structure is located at least between the second segments in different layers from the first segments and the electric connection structure.

[0010] In some embodiments, the insulation structure is also located in the spacing.

[0011] In some embodiments, the bus bar and the electric connection structure are in different layers, and the first segments and the second segments are in the same layer.

[0012] In some embodiments, the electric connection structure comprises third segments and fourth segments alternately arranged and interconnected along the second direction, part of the third segments and the fourth segments are in different layers, and the fourth segments correspond to the bypass diodes one by one; the photovoltaic assembly further comprises an insulation structure, which is located at least between part of the fourth segments and the bypass diodes.

[0013] In some embodiments, the electric connection structure is located in the spacing between two sub-battery strings adjacent along the first direction in the same battery module.

[0014] In some embodiments, the sub-cell string comprises a plurality of solar cells connected in series, and the electrical connection structure is located on the back surface of the solar cells; the photovoltaic module further comprises: an interconnection structure located in the interval between adjacent solar cells in the sub-cell string and achieving series connection of the adjacent solar cells; and an insulating structure located between the electrical connection structure and the interconnection structure and between the electrical connection structure and the back surface of the solar cells.

[0015] In some embodiments, two sub-cell strings facing each other in the second direction form a sub-cell string group, and one of the sub-cell strings has a third connection portion and the other of the sub-cell strings has a fourth connection portion; the photovoltaic module further comprises: a conductive interconnection member having opposite third and fourth ends, the third end being electrically connected to the third connection portion, and the fourth end being electrically connected to the fourth connection portion.

[0016] In some embodiments, the sub-cell string comprises N solar cells connected in series, N being a positive integer and N being an even number; one of the sub-cell strings has the third connection portion and is electrically connected to the first connection portion, and the other of the sub-cell strings has the fourth connection portion and is electrically connected to the second connection portion, N / 2 solar cells being connected in series between the third connection portion and the first connection portion, and N / 2 solar cells being connected in series between the fourth connection portion and the second connection portion.

[0017] In some embodiments, the sub-cell string comprises N solar cells connected in series, N being a positive integer and N being an odd number; one of the sub-cell strings has the third connection portion and is electrically connected to the first connection portion, and the other of the sub-cell strings has the fourth connection portion and is electrically connected to the second connection portion, (N+1) / 2 or (N-1) / 2 solar cells being connected in series between the third connection portion and the first connection portion, and (N+1) / 2 or (N-1) / 2 solar cells being connected in series between the fourth connection portion and the second connection portion.

[0018] In some embodiments, the sub-cell string comprises a plurality of solar cells connected in series; the photovoltaic module further comprises: an interconnection structure located in the interval between adjacent solar cells in the sub-cell string and achieving series connection of the adjacent solar cells; wherein the third connection portion is electrically connected to at least one interconnection structure located in the interval between adjacent solar cells in one of the sub-cell strings, and the fourth connection portion is electrically connected to at least one interconnection structure located in the interval between adjacent solar cells in the other of the sub-cell strings.

[0019] The technical solutions provided by the embodiments of the present disclosure have at least the following advantages:

[0020] On the one hand, based on the electrical connection relationship between the electrical connection structure and the battery module, a single battery string is divided into two sub-battery strings at the first connection part or the second connection part, and the sub-battery string has more than one current transmission path at the first connection part or the second connection part. In this way, for the four sub-battery strings in a single battery module, any sub-battery string corresponds to at least two different current transmission paths, so that when a single sub-battery string in the same battery module is blocked or has other faults, and the bypass diode corresponding to the battery module is not turned on, the remaining three sub-battery strings can generate electricity normally with the help of the electrical connection structure, thereby improving the reliability and power generation of the photovoltaic module. Moreover, any sub-battery string corresponds to at least two different current transmission paths, so that the current in the photovoltaic module has multiple transmission paths, effectively avoiding excessive heat generated by the current being affected by a large load during transmission, thereby reducing the risk of hot spots and improving the service life of the photovoltaic module.

[0021] On the other hand, in any battery module, whether a single sub-battery string or multiple sub-battery strings are blocked or have other faults, and cause the bypass diode corresponding to the battery module to be turned on, the entire battery module no longer performs normal power generation work based on the turn-on of the bypass diode, which is beneficial to timely suspend the working state of the battery module with faults, avoid the influence of the sub-battery string with faults on the sub-battery string without faults in the same battery module, and effectively protect the sub-battery string without faults in the same battery module, thereby improving the reliability and service life of the photovoltaic module. BRIEF DESCRIPTION OF DRAWINGS

[0022] One or more embodiments are exemplified by the pictures in the drawings corresponding thereto, which do not constitute a limitation on the embodiments, unless specifically stated. The drawings in the drawings do not constitute a proportional limitation; in order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 A partial circuit schematic diagram of the photovoltaic module provided by the embodiments of the present disclosure;

[0024] Figure 2 Another partial circuit schematic diagram of the photovoltaic module provided by the embodiments of the present disclosure;

[0025] Figure 3 A partial circuit schematic diagram of the photovoltaic module provided by the embodiments of the present disclosure;Figure 2 A path schematic diagram of the first transmission path, the second transmission path and the third transmission path in the photovoltaic module shown in the figure;

[0026] Figure 4 A partial simple structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure;

[0027] Figure 5 A partial cross-sectional structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure;

[0028] Figure 6 Another partial cross-sectional structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure;

[0029] Figure 7 Still another partial cross-sectional structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure;

[0030] Figure 8 A partial top view structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure;

[0031] Figure 9 A partial cross-sectional structure schematic diagram of the photovoltaic module shown in the figure; Figure 8 A partial cross-sectional structure schematic diagram of the photovoltaic module shown in the figure;

[0032] Figure 10 A partial three-dimensional structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure;

[0033] Figure 11 Still another partial circuit schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure;

[0034] Figure 12 A partial cross-sectional structure schematic diagram of the photovoltaic module shown in the figure; Figure 11 A path schematic diagram of the fourth transmission path and the fifth transmission path in the photovoltaic module shown in the figure; DETAILED DESCRIPTION

[0035] As known from the background, the hot spot effect of the solar cell needs to be improved.

[0036] The present disclosure provides a photovoltaic module. In one aspect, based on the electrical connection structure, a single cell string is divided into two sub-cell strings at the first connection part or the second connection part, so that the sub-cell string has at least two different current transmission paths at the first connection part or the second connection part. When a single cell module fails and the bypass diode corresponding to the cell module is not turned on, the remaining three sub-cell strings can generate electricity normally through the electrical connection structure, thereby improving the reliability and power generation of the photovoltaic module. In addition, any sub-cell string has at least two different current transmission paths, so that the current in the photovoltaic module has multiple transmission paths, effectively avoiding excessive heat generated by the current being affected by a large load during transmission, thereby reducing the risk of hot spots and improving the service life of the photovoltaic module. In another aspect, when a single sub-cell string or multiple sub-cell strings in any cell module fail and cause the bypass diode corresponding to the cell module to be turned on, the entire cell module no longer generates electricity normally, which is beneficial to timely suspend the working state of the failed cell module, avoid the influence of the failed sub-cell string on the sub-cell string without failure in the same cell module, and effectively protect the sub-cell string without failure in the same cell module, thereby improving the reliability and service life of the photovoltaic module.

[0037] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0038] In this document, the term "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists, A and B exist, and B exists. In addition, the character " / " in this document generally represents a "or" relationship between the front and rear associated objects.

[0040] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0041] In the description of the embodiments of the present application, the technical 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 shown in the drawings, and are only for the convenience of describing the embodiments 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 a limitation on the embodiments of the present application.

[0042] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; 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 internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] In the corresponding drawings of the embodiments of the present application, in order to better understand and facilitate the description, the thickness and area of the layer are enlarged. When describing that a component (such as a layer, a film, a region or a substrate) is on or on the surface of another component, the component can be "directly" on the surface of the other component, or there can be a third component between the two components. On the contrary, when describing that a component is on the surface of another component or a component surface is formed or provided with another component, it means that there is no third component between the two components. In addition, when describing that a component is "formed substantially" on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on the edge of the entire surface.

[0044] In the description of the embodiments of the present application, when a certain component "includes" another component, unless otherwise specified, it does not exclude other components, and other components can be further included. In addition, when a layer, film, region, plate, etc. component is referred to as "on / above" another component, it can be "directly on" the other component (i.e. between the other component surface and the layer, film, region, plate, etc. component, there is no other component), or there can be another component present therebetween. In addition, when a layer, film, region, plate, etc. component is "directly on" another component, or when a layer, film, region, plate, etc. component is on the surface of another component, it means that there is no other component therebetween.

[0045] The terms used in the description of the various described embodiments herein are for the purpose of describing particular embodiments only and are not intended to be limiting. As used in the description of the various embodiments and the appended claims, the article "a", "an" is intended to include the plural, unless the context clearly indicates otherwise. Among other things, the components include a layer, film, region, or plate.

[0046] The embodiments of the present disclosure will be described in detail below with reference to the drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are presented in order to enable the reader to better understand the embodiments of the present disclosure. However, the technical solutions claimed by the embodiments of the present disclosure can be implemented even without these technical details and based on various changes and modifications of the following embodiments.

[0047] The embodiments of the present disclosure provide a photovoltaic module, which will be described in detail below with reference to the drawings.

[0048] Reference Figure 1The photovoltaic module 100 comprises: a plurality of cell strings 101, the cell strings 101 comprising two sub-cell strings 111 arranged in a first direction X and connected in series with each other, wherein the plurality of cell strings 101 are arranged in the first direction X and the second direction Y, and two cell strings 101 are arranged in the second direction Y and connected in parallel with each other to form a cell module 102, and the first direction X and the second direction Y intersect; a bus bar 103, the bus bar 103 being provided with a bypass diode 113 corresponding to the cell module 102 one by one, and at least two cell modules 102 arranged in the first direction X are connected in series by the bus bar 103; a first connecting part 121 and a second connecting part 131 arranged in the second direction Y, in the same cell module 102, two sub-cell strings 111 of one cell string 101 are connected in series by the first connecting part 121, and two sub-cell strings 111 of another cell string 101 are connected in series by the second connecting part 131; and an electrical connection structure 104, the electrical connection structure 104 having a first end 104a and a second end 104b opposite to each other in the second direction Y, the first end 104a being electrically connected to the first connecting part 121, and the second end 104b being electrically connected to the second connecting part 131.

[0049] It should be noted that, Figure 1 A partial circuit schematic diagram of the photovoltaic module is provided for the embodiments of the present disclosure, in addition, Figure 1 The cell strings 101, the sub-cell strings 111 and the cell modules 102 are schematically shown by different size dashed boxes, and the electrical connection structure 104 is schematically shown by a thicker solid line. In addition, Figure 1 In the embodiment, three cell modules 102 connected in series by the bus bar 103 in the photovoltaic module 100 are taken as an example, and the number of the cell modules 102 connected in series in the first direction X of the photovoltaic module 100 is not limited in actual application, that is, the number of the cell strings 101 arranged in the first direction X is not limited, for example, which can be 2, 4, 5 or 6, etc.

[0050] It should be noted that, in the second direction Y, two sub-cell strings 111 are connected between the first connecting part 121 and the second connecting part 131, and the two sub-cell strings 111 belong to different cell strings 101 in the same cell module 102. Based on this, the first end 104a of the electrical connection structure 104 is electrically connected to the first connecting part 121, the second end 104b of the electrical connection structure 104 is electrically connected to the second connecting part 131, but the electrical connection structure 104 is not electrically connected to the bus bar 103, in other words, in general, the current flowing through the electrical connection structure 104 and the current flowing through the bypass diode 113 in the bus bar 103 belong to different transmission paths.

[0051] Thus, based on the electrical connection relationship between the electrical connection structure 104 and the battery module 102, the single battery string 101 is divided into two sub-battery strings 111 at the first connection part 121 or the second connection part 131, and the sub-battery string 111 has more than one current transmission path at the first connection part 121 or the second connection part 131. For example, (1) the current can flow from one sub-battery string 111 to another sub-battery string 111 in the same battery string 101 through the first connection part 121 or the second connection part 131; (2) the current can flow from one sub-battery string 111 to another sub-battery string 111 in the same battery module 102 through part of the first connection part 121, the electrical connection structure 104, and part of the second connection part 131.

[0052] Thus, for the four sub-battery strings 111 in a single battery module 102, any sub-battery string 111 corresponds to at least two different current transmission paths, so that when a single sub-battery string 111 in the same battery module 102 is shaded or has other faults, and the bypass diode 113 corresponding to the battery module 102 is not conducting, the remaining three sub-battery strings 111 can generate electricity normally through the electrical connection structure 104, thereby improving the reliability and power generation of the photovoltaic module 100. Moreover, any sub-battery string 111 corresponds to at least two different current transmission paths, so that the current in the photovoltaic module 100 has multiple transmission paths, effectively avoiding excessive heat generated by the current being affected by a large load during transmission, thereby reducing the risk of hot spots and improving the service life of the photovoltaic module 100.

[0053] It should be noted that the faults of the single sub-battery string 111 include the single sub-battery string 111 being shaded, the single sub-battery string 111 being damaged, the single sub-battery string 111 being aged, etc. Among them, the single sub-battery string 111 being shaded at least includes the case that at least a partial area of at least one solar cell in the single sub-battery string 111 is shaded; the single sub-battery string 111 being damaged or aged at least includes the case that at least one solar cell in the single sub-battery string 111 is damaged or aged.

[0054] It is worth noting that the faults of the single sub-battery string 111 include various cases. Therefore, the current in the photovoltaic module during transmission at least exists the following two cases:

[0055] In some cases, when a single battery module 102 fails, the bypass diode 113 corresponding to the battery module 102 is not conducting, and the battery module 102 can continue to generate electricity without relying on the bypass diode 113, but relying on the electrical connection structure 104.

[0056] In some cases, when the bypass diode 113 is turned on, most of the current will be transmitted to another battery module 102 through the bypass diode 113. At this time, there will also be a small part of the current in the battery module 102 that has failed. At this time, the current flowing through the battery module 102 is small, and the battery module 102 will not generate a large amount of heat. Thus, the battery module 102 that has failed can avoid a serious hot spot effect, and after the failure is eliminated, the battery module 102 can continue to generate electricity normally. In other words, the bypass diode 113 and the electrical connection structure 104 have different current shunting effects. Thus, when the battery module 102 fails, the bypass diode 113 and the electrical connection structure 104 can be used to flexibly shunt the current in the photovoltaic module 100, thereby further improving the hot spot effect of the photovoltaic module 100.

[0057] In some cases, when the bypass diode 113 is turned on, most of the current will be transmitted to another battery module 102 through the bypass diode 113. At this time, there will also be a small part of the current in the battery module 102 that has failed. At this time, the current flowing through the battery module 102 is small, and the battery module 102 will not generate a large amount of heat. Thus, the battery module 102 that has failed can avoid a serious hot spot effect, and after the failure is eliminated, the battery module 102 can continue to generate electricity normally. In other words, the bypass diode 113 and the electrical connection structure 104 have different current shunting effects. Thus, when the battery module 102 fails, the bypass diode 113 and the electrical connection structure 104 can be used to flexibly shunt the current in the photovoltaic module 100, thereby further improving the hot spot effect of the photovoltaic module 100.

[0058] The embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0059] In some embodiments, in combination with reference to Figure 2 and Figure 3 , the transmission path of the current in the first connecting portion 121 is a first transmission path S1, the transmission path of the current in the second connecting portion 131 is a second transmission path S2, and the transmission path of the current in the electrical connection structure 104 is a third transmission path S3. The transmission resistance of the first transmission path S1 is smaller than the transmission resistance of the third transmission path S3, and the transmission resistance of the second transmission path S2 is smaller than the transmission resistance of the third transmission path S3.

[0060] In some embodiments, in combination with reference to Figure 2 , another partial circuit schematic diagram of the photovoltaic module provided by the embodiments of the present disclosure is shown in FIG. 4. Figure 3 In some embodiments, in combination with reference to Figure 2 , a path schematic diagram of the first transmission path, the second transmission path, and the third transmission path of the photovoltaic module shown in FIG. 3 is shown in FIG. 5.

[0061] It is worth noting that in the process of current transmission, most of the current will choose to flow through the transmission path with small transmission resistance. Thus, when the battery module 102 is not faulty, most of the current will directly flow from one sub-battery string 111 to another sub-battery string 111 in the same battery string 101 through the first connection part 121 or the second connection part 131, most of the current will choose the first transmission path S1 or the second transmission path S2, and almost no current will flow through the electrical connection structure 104 and the bypass diode 113, i.e., the current on the third transmission path S3 is small or 0; when the battery module 102 is faulty and the bypass diode 113 is not turned on, more current will flow through the electrical connection structure 104, i.e., the third transmission path S3 is chosen, to avoid the hot spot effect caused by excessive current in the faulty sub-battery string 111; when the battery module 102 is faulty and the bypass diode 113 is turned on, more current will flow through the bypass diode 113 to avoid the hot spot effect caused by excessive current in the faulty battery module 102.

[0062] The transmission resistance of the first transmission path S1 and the transmission resistance of the second transmission path S2 are both less than the transmission resistance of the third transmission path S3, at least including the following cases:

[0063] In some cases, the material of the first connection part 121, the material of the second connection part 131, and the material of the electrical connection structure 104 are the same, and the cross-sectional areas of the three have little difference or no difference, and the lengths of the first transmission path S1 and the second transmission path S2 are both less than the length of the third transmission path S3.

[0064] In other cases, the lengths of the first transmission path S1, the second transmission path S2, and the third transmission path S3 have little difference or no difference, and the cross-sectional areas of the three have little difference or no difference, the resistivity of the material of the first connection part 121 is less than the resistivity of the material of the electrical connection structure 104, and the resistivity of the material of the second connection part 131 is less than the resistivity of the material of the electrical connection structure 104, in other words, the material of the first connection part 121 and the material of the second connection part 131 are different from the material of the electrical connection structure 104.

[0065] In practical applications, at least one of the resistivity of the materials of the first connection part 121, the second connection part 131, and the electrical connection structure 104, the cross-sectional areas of the three, and the lengths of the first transmission path S1, the second transmission path S2, and the third transmission path S3 can be adjusted to achieve that the transmission resistance of the first transmission path S1 is less than the transmission resistance of the third transmission path S3, and the transmission resistance of the second transmission path S2 is less than the transmission resistance of the third transmission path S3.

[0066] In some embodiments, continuing to refer to Figure 2The two battery strings 101 in the same battery module 102 are respectively a first battery string 101a and a second battery string 101b; the bypass diode 113 corresponding to the battery module 102 is reversely connected in series between the positive electrode and the negative electrode of the first battery string 101a and reversely connected in series between the positive electrode and the negative electrode of the second battery string 101b.

[0067] It should be noted that, Figure 2 The first battery string 101a and the second battery string 101b are respectively shown by different dashed boxes in the figure.

[0068] Therefore, when the battery module 102 works normally, the bypass diode 113 is reversely cut off and does not affect the circuit; if there is a solar cell that does not work normally in the battery module 102 connected in parallel with the bypass diode 113, for example, the solar cell is shaded, the size of the current in the battery module 102 is determined by the area of the solar cell that is shaded, when the area of the solar cell that is shaded is higher than a preset value, the bypass diode 113 is turned on, at this time, the battery module 102 is in a short-circuit state, but the current generated by other battery modules 102 connected in series with the battery module 102 through the bus bar 103 can flow through the turned-on bypass diode 113, so that the photovoltaic module 100 continues to generate electricity, and the situation that the power generation circuit is not connected due to the failure of a certain battery module 102 does not occur.

[0069] It should be noted that the preset value of the area of the solar cell that is shaded for turning on the bypass diode 113 is related to the size specification of the designed bypass diode 113, and the preset value can be adjusted according to actual needs.

[0070] In some embodiments, referring to Figures 4 to 7 The bus bar 103 can include first segments 123 and second segments 133 that are alternately arranged and interconnected along the first direction X, the second segments 133 correspond to the battery modules 102 one by one, and the bypass diode 113 is arranged on the second segment 133; the photovoltaic module 100 can further include an insulation structure 105, the insulation structure 105 is located between at least part of the second segments 133 and the electrical connection structure 104.

[0071] It should be noted that, Figure 4 A local simple structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure; Figure 5 A local cross-sectional structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure; Figure 6 Another local cross-sectional structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure; Figure 7 Still another local cross-sectional structure schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure.

[0072] In addition, to show the relative position relationship of the busbar 103, the cell string 101, the first connecting part 121 and the second connecting part 131 in the photovoltaic module 100, Figure 4 In the figure, the cell string 101, the first connecting part 121, the second connecting part 131, and the first section 123 and the second section 133 in the busbar 103 are shown by the rectangles drawn with different fillings, Figure 4 The rectangles in the figure do not constitute limitation on the specific structure of the above-mentioned components. Figures 5 to 7 In the figure, the first section 123 and the second section 133 in the busbar 103 are also shown by the rectangles drawn with different fillings.

[0073] The at least two cell modules 102 arranged at intervals along the first direction X are connected in series by the busbar 103, including the following embodiments: the first section 123 of the busbar 103 is electrically connected between two cell modules 102 adjacent along the first direction X, so as to realize the series connection of the two adjacent cell modules 102. In addition, the second section 133 of the busbar 103 is in parallel with both cell strings 101 in the cell module 102, and the bypass diode 113 is arranged on the second section 133, that is, the two cell strings 101 in a single cell module 102 are in parallel with a single bypass diode 113.

[0074] In some cases, to facilitate the arrangement of the cell string 101, the busbar 103 tends to be arranged in the interval between different cell strings 101, so as to realize the close arrangement of the cell strings 101 and to avoid the need to additionally reserve the layout space required by the busbar 103 in the photovoltaic module 100. For example, the busbar 103 as a whole can extend along the first direction X, and the busbar 103 is located in the interval between two cell strings 101 arranged at intervals along the second direction Y. Based on this, along the second direction Y, two sub-cell strings 111 are connected between the first connecting part 121 and the second connecting part 131, and the two ends of the electrical connection structure 104 are electrically connected with the first connecting part 121 and the second connecting part 131 respectively, so that the electrical connection structure 104 penetrates the cell module 102 along the second direction Y, and will overlap with the second section 133 of the busbar 103 located in the interval between the two cell strings 101 of the cell module 102 in the top view, in other words, taking the plane formed by the first direction X and the second direction Y as the projection plane, the orthographic projection of the electrical connection structure 104 on the projection plane overlaps with the orthographic projection of the second section 133 on the projection plane.

[0075] Therefore, the insulating structure 105 is designed to be located at least between the partial second section 133 and the electrical connection structure 104, which is beneficial to realize insulation between the second section 133 and the electrical connection structure 104 by means of the insulating structure 105, i.e., realize insulation between the bypass diode 113 and the electrical connection structure 104, so that the photovoltaic module 100 can realize overall interconnection of the circuit and automatic shunting of the current in the photovoltaic module 100 by means of the bypass diode 113 and the electrical connection structure 104 respectively, effectively avoid the current in the faulty sub-cell string 111 being too large and the hot spot effect being significant, and realize effective cooling of the entire photovoltaic module 100, which not only protects the photovoltaic module 100 as a whole, but also improves the reliability of the photovoltaic module 100.

[0076] The insulating structure 105 located at least between the partial second section 133 and the electrical connection structure 104 at least includes the following embodiments.

[0077] In some embodiments, referring to Figure 5 or Figure 6 , the first section 123 and the electrical connection structure 104 can be in the same layer, the partial second section 133 is located between the first section 123 and the electrical connection structure 104, the remaining second section 133 is in a different layer from the first section 123, and the second section 133 located between the first section 123 and the electrical connection structure 104 has a spacing 108 between the second section 133 and the electrical connection structure 104, and the insulating structure 105 is located at least between the second section 133 in the different layer from the first section 123 and the electrical connection structure 104.

[0078] With respect to the electrical connection structure 104, the busbar 103 is arched along a third direction Z, the arched part is formed by the second section 133, and the second section 133 and the electrical connection structure 104 are provided with the insulating structure 105 in the spacing along the third direction Z, so that the second section 133 and the electrical connection structure 104 do not directly contact each other, and further so that the bypass diode 113 provided on the second section 133 does not directly contact the electrical connection structure 104. Moreover, the second section 133 located between the first section 123 and the electrical connection structure 104, i.e., the second section 133 in the same layer as the electrical connection structure 104, has a spacing 108 along the first direction X between the second section 133 and the electrical connection structure 104, so that the second section 133 in the same layer as the electrical connection structure 104 also does not directly contact the electrical connection structure 104, and further so that the entire busbar 103 does not directly contact the electrical connection structure 104. The third direction Z is the thickness direction of the photovoltaic module 100, and the first direction X, the second direction Y and the third direction Z are two by two intersected. In one example, the first direction X, the second direction Y and the third direction Z can be two by two orthogonal.

[0079] It should be noted that Figure 5 and Figure 6In the embodiment, only a cross-sectional shape of the arched second section 133 relative to the electrical connection structure 104 is shown, i.e. a square ring with an opening. In actual applications, the cross-sectional shape of the arched second section 133 is not limited too much, for example, the cross-sectional shape of the arched second section 133 can also be a circular ring with an opening, or an arc-shaped ring.

[0080] In some cases, referring to Figure 5 , the insulating structure 105 is only located between the second section 133 and the electrical connection structure 104 which are in different layers from the first section 123. The interval 108 between the second section 133 and the electrical connection structure 104 which are in the same layer can be an air gap, and other isolation materials can also be present in the interval 108.

[0081] In other cases, referring to Figure 6 , on the basis that the insulating structure 105 is located between the second section 133 and the electrical connection structure 104 which are in different layers from the first section 123, the insulating structure 105 can also be located in the interval 108 (refer to Figure 5 ). In this way, the electrical connection structure 104 and the second section 133 which have an overlap in the orthographic projection on the projection plane are both provided with the insulating structure 105. On the one hand, this is conducive to improving the insulation effect between the electrical connection structure 104 and the second section 133. On the other hand, this is conducive to achieving good support for the arched second section 133 by means of the insulating structure 105, avoiding the collapse of the second section 133 towards the electrical connection structure 104 and causing a short circuit therebetween, so as to improve the safety and reliability of the photovoltaic module 100.

[0082] In other embodiments, referring to Figure 7 , the bus bar 103 and the electrical connection structure 104 can be in different layers, and the first section 123 and the second section 133 can be in the same layer. In this way, the electrical connection structure 104 can be a long strip-shaped structure extending in the second direction Y, and the bus bar 103 can be a long strip-shaped structure extending in the first direction X. The insulating structure 105 is provided between at least the electrical connection structure 104 and the second section 133 which have an overlap in the orthographic projection on the projection plane. This is conducive to simplifying the shape and structure of the bus bar 103 and the electrical connection structure 104 while ensuring the insulation therebetween, for example, avoiding the bus bar 103 having an arched portion in the third direction Z, and reducing the manufacturing cost of the bus bar 103 and the electrical connection structure 104.

[0083] In some embodiments, in combination with Figure 8 and Figure 9The electric connection structure 104 can include third segments 114 and fourth segments 124 alternately arranged and interconnected along the second direction Y, the third segments 114 and part of the fourth segments 124 can be in different layers, and the fourth segments 124 correspond to the bypass diodes 113 one by one; the photovoltaic module 100 can further include an insulating structure 105, the insulating structure 105 is located at least between part of the fourth segments 124 and the bypass diodes 113.

[0084] It should be noted that, Figure 8 is a schematic diagram of a partial top view structure of a photovoltaic module provided by the embodiments of the present disclosure; Figure 9 is a schematic diagram of a partial cross-sectional structure of a photovoltaic module. Figure 8 In addition, in order to show the relative position relationship of the bus bar 103, the bypass diode 113 arranged on the bus bar 103, and the electric connection structure 104, Figure 8 the fourth segment 124 of the electric connection structure 104 is drawn in a perspective drawing manner; and in order to distinguish the third segment 114 and the fourth segment 124 of the electric connection structure 104, Figure 9 the third segment 114 and the fourth segment 124 of the electric connection structure 104 are divided by a dashed line in the electric connection structure 104.

[0085] With respect to the bus bar 103, the electric connection structure 104 is arched upward along the third direction Z, and the arched part is formed by the fourth segment 124, and the fourth segment 124 and the bypass diode 113 are spaced apart along the third direction Z and are provided with the insulating structure 105, so that the fourth segment 124 and the bypass diode 113 are not in direct contact, and the electric connection structure 104 is further prevented from being in direct contact with the bypass diode 113.

[0086] In some cases, the bus bar 103 can be a long strip structure extending along the first direction X, the third segment 114 and the bus bar 103 can be in the same layer, and part of the fourth segment 124 in contact with the third segment 114 is also in the same layer with the bus bar 103. The fourth segment 124 in the same layer with the bus bar 103 and the bus bar 103 can also have a spacing along the second direction Y (not shown in the figure), so that the fourth segment 124 in the same layer with the bus bar 103 and the bus bar 103 are not in direct contact, and the electric connection structure 104 as a whole is further prevented from being in direct contact with the bus bar 103.

[0087] In other cases, the third segment 114 and the bus bar 103 can also be in different layers, as long as the electric connection structure 104 as a whole is prevented from being in direct contact with the bus bar 103.

[0088] In some embodiments, referring to Figure 10 , Figure 10A partial perspective structural schematic diagram of the photovoltaic module provided by the embodiment of the present disclosure is shown in FIG. 1. The electrical connection structure 104 is located in the interval between two adjacent sub-cell strings 111 in the same cell module 102 along the first direction X. In this way, the gap in the cell module 102 can be fully utilized to improve the space utilization in the photovoltaic module 100.

[0089] In some other embodiments, the sub-cell string can include a plurality of solar cells connected in series, and the electrical connection structure is located on the back surface of the solar cell. The photovoltaic module can further include an interconnection structure located in the interval between adjacent solar cells in the sub-cell string and achieving the series connection of the adjacent solar cells; and an insulation structure located between the electrical connection structure and the interconnection structure and between the electrical connection structure and the back surface of the solar cell.

[0090] It should be noted that, Figure 10 In the embodiment shown in FIG. 1, only one sub-cell string 111 includes three solar cells 141 connected in series as an example. In actual applications, the number of solar cells 141 connected in series included in a single sub-cell string 111 is not limited by the embodiment of the present disclosure, and can be, for example, 4, 5, 6, 7, 8, 9, 10, or 12, etc. In addition, in order to clearly show the first segment 123 and the second segment 133 of the busbar 103, and the electrical connection structure 104, Figure 10 In the embodiment shown in FIG. 1, the bypass diode is not shown, and the first segment 123 and the second segment 133 are drawn by different filling methods. In addition, Figure 10 In the embodiment shown in FIG. 1, the cell string 101, the sub-cell string 111, and the solar cell 141 are shown by dashed boxes with different densities.

[0091] It should be noted that the insulation structure 105 can not only be used to achieve the insulation between the electrical connection structure 104 and the busbar 103, but also be used to achieve the insulation between the electrical connection structure 104 and the interconnection structure 106, so as to avoid the short circuit of the several solar cells 141 in the sub-cell string 111 caused by the electrical connection structure 104, thereby avoiding affecting the normal work of the sub-cell string 111. In addition, the insulation structure 105 can also be used to achieve the insulation between the electrical connection structure 104 and the back surface of the solar cell 141, specifically, to achieve the insulation between the electrical connection structure 104 and the grid lines on the solar cell 141, so as to avoid affecting the normal work of the solar cell 141.

[0092] In the above two embodiments, the sub-cell string 111 can include a plurality of solar cells 141 connected in series, and the solar cell 141 can include an IBC (Interdigitated Back Contact) cell, a TOPCON (Tunnel Oxide Passivated Contact) cell, a PERC (Passivated emitter and real cell) cell, or a heterojunction cell. It should be noted that the type of the solar cell 141 constituting the sub-cell string 111 is not limited in the embodiments of the present disclosure.

[0093] In some embodiments, referring to Figure 10 or Figure 11 , two sub-cell strings 111 facing each other in the second direction Y form a sub-cell string group A, and in the sub-cell string group A, one sub-cell string 111 has a third connecting portion 151 inside, and the other sub-cell string 111 has a fourth connecting portion 161 inside; the photovoltaic module 100 can further include a conductive interconnector 107 having opposite third and fourth ends 107a and 107b, the third end 107a being electrically connected to the third connecting portion 151, and the fourth end 107b being electrically connected to the fourth connecting portion 161.

[0094] It should be noted that Figure 11 another partial circuit schematic diagram of the photovoltaic module provided by the embodiments of the present disclosure. In addition, in order to distinguish the third connecting portion 151 and the fourth connecting portion 161, Figure 10 the third connecting portion 151 and the fourth connecting portion 161 are drawn in different filling manners; in order to distinguish the third connecting portion 151, the fourth connecting portion 161, and the conductive interconnector 107, Figure 11 the third connecting portion 151, the fourth connecting portion 161, and the conductive interconnector 107 are drawn in different thick solid lines; Figure 11 in the above embodiment, only one sub-cell string 111 includes 12 solar cells 141 connected in series as an example, and in actual applications, the number of solar cells 141 connected in series included in the single sub-cell string 111 is not limited in the embodiments of the present disclosure.

[0095] It should be noted that referring to Figure 10 or Figure 11The photovoltaic module 100 can further include an interconnection structure 106 located in the interval between adjacent solar cells 141 in the sub-cell string 111 and achieving the series connection of the adjacent solar cells 141. The third connection part 151 and the fourth connection part 161 can each be electrically connected with at least one interconnection structure 106 in the corresponding sub-cell string 111. The electrical connection relationship between the third connection part 151 and the fourth connection part 161 and the interconnection structure 106 will be described in detail later.

[0096] In this way, based on the electrical connection relationship between the conductive interconnection 107 and the sub-cell string group A, the single sub-cell string 111 is divided into two partitions 171 at the third connection part 151 or the fourth connection part 161, and the partition 171 has more than one current transmission path at the third connection part 151 or the fourth connection part 161. For example, the current can flow from one partition 171 to another partition 171 in the same sub-cell string 111 through the third connection part 151 or the fourth connection part 161; or the current can flow from one partition 171 in one sub-cell string 111 to another partition 171 in another sub-cell string 111 through the third connection part 151, the conductive interconnection 107, and the fourth connection part 161.

[0097] Therefore, for the four partitions 171 in the single sub-cell string group A, any partition 171 corresponds to at least two different current transmission paths. When a single partition 171 in the same sub-cell string group A is shaded or has other faults, and the bypass diode 113 corresponding to the sub-cell string group A is not turned on, the remaining three partitions 171 can generate electricity normally through the conductive interconnection 107, thereby improving the reliability and power generation of the photovoltaic module 100. Moreover, any partition 171 corresponds to at least two different current transmission paths, which further makes the current in the photovoltaic module 100 have more transmission paths, effectively avoids the current from generating too much heat due to the influence of a large load in the transmission process, thereby reducing the risk of hot spots and improving the service life of the photovoltaic module 100.

[0098] It is worth noting that the single sub-cell string 111 is divided into two partitions 171 through the conductive interconnection 107, so that when one of the two partitions 171 fails, the other partition 171 can still generate electricity without being affected, thereby improving the reliability and power generation of the photovoltaic module 100. In addition, based on the overall interconnection of the circuit in the photovoltaic module 100 and the automatic shunt of the current by the bypass diode 113, the electrical connection structure 104, and the conductive interconnection 107, it is further beneficial to avoid the current in the photovoltaic module 100 with faults from being too large and the hot spot effect being significant, further improve the cooling effect of the entire photovoltaic module 100, and further improve the reliability of the photovoltaic module 100.

[0099] It should be noted that, Figure 10 The two sub-areas 171 of the same sub-cell string 111 are schematically shown by dashed boxes in both of Figure 11 In addition, Figure 10 In the actual application, the specific structure of the interconnection structure 106 for realizing the series connection of adjacent solar cells 141 can be different according to the type of the solar cell 141, and the specific structure of the interconnection structure 106 is not limited too much in the embodiments of the present disclosure.

[0100] In some cases, referring to Figure 10 or Figure 11 , the bus bar 103 tends to be arranged in the interval between different cell strings 101. For example, the bus bar 103 as a whole can extend along the first direction X, and the bus bar 103 is located in the interval between two cell strings 101 arranged at intervals along the second direction Y. Based on this, the two ends of the conductive interconnection 107 are electrically connected with the third connection part 151 and the fourth connection part 161 respectively, then taking the plane formed by the first direction X and the second direction Y as the projection plane, the orthographic projection of at least part of the conductive interconnection 107 on the projection plane overlaps the orthographic projection of the bus bar 103 on the projection plane, and the insulating structure 105 is at least located between the overlapping area of the orthographic projection of the conductive interconnection 107 and the bus bar 103 on the projection plane, to ensure the insulation between the conductive interconnection 107 and the bus bar 103.

[0101] It should be noted that the positional relationship between at least part of the conductive interconnection 107, the insulating structure 105 and the bus bar 103 can be similar to the positional relationship between the electrically connecting structure 104, the insulating structure 105 and the bus bar 103 in the foregoing embodiments, which will not be repeated here. In addition, the cross-sectional shape design of the overlapping area of the orthographic projection of the conductive interconnection 107 and the bus bar 103 on the projection plane can also be similar to the cross-sectional shape design of the overlapping area of the orthographic projection of the electrically connecting structure 104 and the bus bar 103 on the projection plane in the foregoing embodiments, which will not be repeated here.

[0102] It should be noted that the insulating structure 105 can be a single film layer structure or a multi-film layer structure, and the insulating structure 105 can contain more than one kind of insulating and isolating material. The specific structure and material composition of the insulating structure 105 are not limited too much in the embodiments of the present disclosure.

[0103] In some embodiments, in combination with reference to Figure 11 and Figure 12 , Figure 12 is Figure 11The path schematic diagram of the fourth transmission path and the fifth transmission path of the photovoltaic module shown, the transmission path of the current in the interconnection structure 106 is the fourth transmission path S4, and the total transmission path of the current in the third connecting part 151, the fourth connecting part 161 and the conductive interconnection 107 is the fifth transmission path S5; the transmission resistance of the fourth transmission path S4 is less than the transmission resistance of the fifth transmission path S5.

[0104] Thus, when the battery module 102 does not fail, most of the current directly flows from one sub-area 171 to another sub-area 171 in the same sub-cell string 111 through the interconnection structure 106, and almost no current flows through the third connecting part 151, the conductive interconnection 107 and the fourth connecting part 161; when a certain sub-area 171 fails and the bypass diode 113 is not turned on, more current flows through other sub-areas 171 by bypassing the sub-area 171 that fails through the third connecting part 151, the conductive interconnection 107 and the fourth connecting part 161, so as to avoid the hot spot effect caused by excessive current in the sub-area 171 that fails; when a certain sub-area 171 fails and the bypass diode 113 is turned on, more current flows through the bypass diode 113, so as to avoid the hot spot effect caused by excessive current in the battery module 102 that fails.

[0105] The transmission resistance of the fourth transmission path S4 is less than the transmission resistance of the fifth transmission path S5 at least includes the following cases:

[0106] In some cases, the material of the interconnection structure 106, the material of the third connecting part 151, the material of the fourth connecting part 161 and the material of the conductive interconnection 107 are the same, and the cross-sectional areas of the four are small or have no difference, and the length of the fourth transmission path S4 is less than the length of the fifth transmission path S5.

[0107] In other cases, the length of the fourth transmission path S4 and the length of the fifth transmission path S5 are small or have no difference, and the cross-sectional areas of the interconnection structure 106, the third connecting part 151, the fourth connecting part 161 and the conductive interconnection 107 are small or have no difference, the resistivity of the material of the interconnection structure 106 is less than the resistivity of the material of each of the third connecting part 151, the fourth connecting part 161 and the conductive interconnection 107, in other words, the material of the interconnection structure 106 and the material of each of the third connecting part 151, the fourth connecting part 161 and the conductive interconnection 107 are different.

[0108] In practical applications, at least one of the resistivity of the material of the interconnection structure 106, the third connecting portion 151, the fourth connecting portion 161, and the conductive interconnector 107, the cross-sectional area of the three, and the length of the fourth transmission path S4 and the fifth transmission path S5 can be adjusted to achieve that the transmission resistance of the fourth transmission path S4 is less than the transmission resistance of the fifth transmission path S5.

[0109] In some embodiments, referring to Figure 11 , the sub-cell string 111 can include N solar cells 141 connected in series, N is a positive integer, and N is an even number; in the sub-cell string group A, one sub-cell string 111 has the third connecting portion 151 and is electrically connected with the first connecting portion 121, and another sub-cell string 111 has the fourth connecting portion 161 and is electrically connected with the second connecting portion 131, N / 2 solar cells 141 are connected in series between the third connecting portion 151 and the first connecting portion 121, and N / 2 solar cells 141 are also connected in series between the fourth connecting portion 161 and the second connecting portion 131.

[0110] It should be noted that, Figure 11 In the above-mentioned embodiment, only the sub-cell string 111 can include 12 solar cells 141 connected in series, 6 solar cells 141 are connected in series between the third connecting portion 151 and the first connecting portion 121, and 6 solar cells 141 are also connected in series between the fourth connecting portion 161 and the second connecting portion 131. In practical applications, the specific value of the even number N can be adjusted according to the requirements, such as 6, 8, 10, or 14, etc.

[0111] In this way, the single sub-cell string 111 is divided into two sub-zones 171 by the conductive interconnector 107, and N / 2 solar cells 141 are connected in series between the third connecting portion 151 and the first connecting portion 121 and between the fourth connecting portion 161 and the second connecting portion 131, that is, any sub-zone 171 includes N / 2 solar cells 141 connected in series. In other words, the third connecting portion 151 and the fourth connecting portion 161 each divide a sub-cell string 111 into two equal parts, so that the current can be more evenly distributed based on the third connecting portion 151, the fourth connecting portion 161, and the conductive interconnector 107, to further avoid the local area temperature of the photovoltaic module 100 being too high and reduce the risk of light spot of the photovoltaic module 100.

[0112] In some embodiments, referring to Figure 10The sub-cell string group A includes N sub-cell strings 111, N is a positive integer, and N is an odd number. In the sub-cell string group A, one sub-cell string 111 has the third connection part 151 and is electrically connected with the first connection part 121, and another sub-cell string 111 has the fourth connection part 161 and is electrically connected with the second connection part 131. Between the third connection part 151 and the first connection part 121, (N+1) / 2 or (N-1) / 2 solar cells 141 are sequentially connected in series. Between the fourth connection part 161 and the second connection part 131, (N+1) / 2 or (N-1) / 2 solar cells 141 are sequentially connected in series.

[0113] It should be noted that, Figure 10 In the embodiment, only the sub-cell string 111 can include three solar cells 141 connected in series. Between the third connection part 151 and the first connection part 121, two solar cells 141 are sequentially connected in series. Between the fourth connection part 161 and the second connection part 131, one solar cell 141 is sequentially connected in series. In actual application, the specific value of the odd number N can be adjusted according to requirements, for example, 5, 7, 9, or 11. In addition, between the third connection part 151 and the first connection part 121, and between the fourth connection part 161 and the second connection part 131, (N+1) / 2 solar cells 141 can be sequentially connected in series. Alternatively, between the third connection part 151 and the first connection part 121, and between the fourth connection part 161 and the second connection part 131, (N-1) / 2 solar cells 141 can be sequentially connected in series.

[0114] In some cases, the single sub-cell string 111 is divided into two sub-zones 171 by means of the conductive interconnector 107. Between the third connection part 151 and the first connection part 121, and between the fourth connection part 161 and the second connection part 131, one of them has (N+1) / 2 solar cells 141 sequentially connected in series, and the other has (N-1) / 2 solar cells 141 sequentially connected in series. In different sub-zones 171, the number of solar cells 141 connected in series is the same or approximately the same, so that the current can be evenly distributed based on the third connection part 151, the fourth connection part 161, and the conductive interconnector 107, to further avoid the local area temperature of the photovoltaic module 100 being too high and reduce the risk of light spot of the photovoltaic module 100.

[0115] In some embodiments, referring to Figure 10 or Figure 11The sub-cell string 111 includes a plurality of solar cells 141 connected in series; the photovoltaic module 100 can further include an interconnection structure 106 located at least in the interval between adjacent solar cells 141 in the sub-cell string 111 and realizing the series connection of the adjacent solar cells 141; wherein the third connecting portion 151 is electrically connected with at least one interconnection structure 106 located in the interval between adjacent solar cells 141 in one sub-cell string 111, and the fourth connecting portion 161 is electrically connected with at least one interconnection structure 106 located in the interval between adjacent solar cells 141 in another sub-cell string 111.

[0116] In some cases, the number of grid lines in the solar cell 141 varies based on the different solar cells 141, and the number of interconnection structures 106, i.e. the number of solder strips, connected with the grid lines also varies. The electrical connection between adjacent solar cells 141 in the sub-cell string 111 is realized by the interconnection structure 106, i.e. the solder strip. Based on the number of grid lines in the solar cell 141 being at least one, the number of interconnection structures 106 connected in series between adjacent solar cells 141 is at least one. Based on this, referring to Figure 10 The third connecting portion 151 is electrically connected with each interconnection structure 106 located in the interval between adjacent solar cells 141 in one sub-cell string 111, and the fourth connecting portion 161 is electrically connected with each interconnection structure 106 located in the interval between adjacent solar cells 141 in another sub-cell string 111.

[0117] In some cases, the third connecting portion 151 is contact-connected with each interconnection structure 106 located in the interval between adjacent solar cells 141 in one sub-cell string 111, and the fourth connecting portion 161 is contact-connected with each interconnection structure 106 located in the interval between adjacent solar cells 141 in another sub-cell string 111.

[0118] In summary, on the one hand, based on the electrical connection structure 104, the single battery string 101 is divided into two sub-battery strings 111 at the first connection part 121 or the second connection part 131, so that the sub-battery string 111 has more than one current transmission path at the first connection part 121 or the second connection part 131. Thus, for a single battery module 102, any sub-battery string 111 corresponds to at least two different current transmission paths, so that when a single sub-battery string 111 in the same battery module 102 is blocked or has other faults, and the bypass diode 113 corresponding to the battery module 102 is not conductive, the remaining three sub-battery strings 111 can all generate electricity normally with the help of the electrical connection structure 104, to improve the reliability and power generation of the photovoltaic module 100. Moreover, any sub-battery string 111 corresponds to at least two different current transmission paths, so that the current in the photovoltaic module 100 has multiple transmission paths, effectively avoiding excessive heat generated by the current being affected by a large load during transmission, thereby reducing the risk of hot spots and improving the service life of the photovoltaic module 100.

[0119] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present disclosure, and in actual application, various changes can be made in form and detail without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various modifications and changes without departing from the spirit and scope of the embodiments of the present disclosure, and therefore the protection scope of the embodiments of the present disclosure should be subject to the scope defined by the claims.

Claims

1. A photovoltaic module, characterized by, The application relates to a photovoltaic module. The photovoltaic module comprises a plurality of battery strings, the battery strings comprise two sub-battery strings which are arranged in a first direction and are connected in series with each other, wherein the plurality of battery strings are arranged in the first direction and a second direction, and two battery strings are arranged in the second direction, and the two battery strings arranged in the second direction are connected in parallel with each other to form a battery module. The first direction and the second direction intersect. A bus bar is provided with bypass diodes corresponding to the battery modules, and at least two battery modules arranged in the first direction are connected in series through the bus bar. A first connecting part and a second connecting part arranged in the second direction, in the same battery module, two sub-battery strings of one battery string are connected in series through the first connecting part, and two sub-battery strings of another battery string are connected in series through the second connecting part. An electric connection structure has opposite first and second ends in the second direction, the first end is electrically connected with the first connecting part, and the second end is electrically connected with the second connecting part.

2. The photovoltaic module of claim 1, wherein, The transmission path of current in the first connecting part is a first transmission path, the transmission path of current in the second connecting part is a second transmission path, and the transmission path of current in the electric connection structure is a third transmission path. The transmission resistance of the first transmission path is smaller than that of the third transmission path, and the transmission resistance of the second transmission path is smaller than that of the third transmission path.

3. The photovoltaic module of claim 1, wherein, The two battery strings in the same battery module are a first battery string and a second battery string. The bypass diodes corresponding to the battery modules are reversely connected in series between the positive and negative poles of the first battery string and reversely connected in series between the positive and negative poles of the second battery string.

4. The photovoltaic module according to any of claims 1 to 3, characterized in that, The bus bar comprises first and second segments which are alternately arranged and interconnected in the first direction, the second segments correspond to the battery modules, and the bypass diodes are arranged on the second segments. The photovoltaic module further comprises an insulation structure which is located between at least part of the second segments and the electric connection structure.

5. The photovoltaic module of claim 4, wherein, The first segments and the electric connection structure are in the same layer, part of the second segments are located between the first segments and the electric connection structure, the remaining second segments are in different layers from the first segments, and the second segments located between the first segments and the electric connection structure have a spacing from the electric connection structure, and the insulation structure is located between at least the second segments in different layers from the first segments and the electric connection structure.

6. The photovoltaic module of claim 5, wherein, The insulation structure is also located in the spacing.

7. The photovoltaic module of claim 4, wherein, The bus bar and the electric connection structure are in different layers, and the first and second segments are in the same layer.

8. The photovoltaic module according to any of claims 1 to 3, characterized in that, The electric connection structure comprises third and fourth segments which are alternately arranged and interconnected in the second direction, part of the third and fourth segments are in different layers, and the fourth segments correspond to the bypass diodes. The photovoltaic module further comprises an insulation structure which is located between at least part of the fourth segments and the bypass diodes.

9. The photovoltaic module of claim 1, wherein, The electric connection structure is located in the interval between two adjacent sub-cell strings in the first direction.

10. The photovoltaic module of claim 1, wherein, The sub-cell string comprises a plurality of solar cells connected in series, and the electric connection structure is located on the back of the solar cells; the photovoltaic module further comprises: An interconnection structure is located in the interval between adjacent solar cells in the sub-cell string, and realizes the series connection of the adjacent solar cells; An insulation structure is located between the electric connection structure and the interconnection structure, and between the electric connection structure and the back of the solar cells.

11. The photovoltaic module of claim 1, wherein, Two sub-cell strings facing each other in the second direction form a sub-cell string group, and one of the sub-cell strings has a third connection part inside, and the other of the sub-cell strings has a fourth connection part inside; The photovoltaic module further comprises: a conductive interconnection part having opposite third and fourth ends, the third end being electrically connected to the third connection part, and the fourth end being electrically connected to the fourth connection part.

12. The photovoltaic module of claim 11, wherein, The sub-cell string comprises N solar cells connected in series, N being a positive integer, and N being an even number; In the sub-cell string group, one of the sub-cell strings has the third connection part and is electrically connected to the first connection part, and the other of the sub-cell strings has the fourth connection part and is electrically connected to the second connection part, N / 2 solar cells being connected in series between the third connection part and the first connection part, and N / 2 solar cells being connected in series between the fourth connection part and the second connection part.

13. The photovoltaic module of claim 11, wherein, The sub-cell string comprises N solar cells connected in series, N being a positive integer, and N being an odd number; In the sub-cell string group, one of the sub-cell strings has the third connection part and is electrically connected to the first connection part, and the other of the sub-cell strings has the fourth connection part and is electrically connected to the second connection part, (N+1) / 2 or (N-1) / 2 solar cells being connected in series between the third connection part and the first connection part, and (N+1) / 2 or (N-1) / 2 solar cells being connected in series between the fourth connection part and the second connection part.

14. The photovoltaic module of claim 11, wherein, The sub-cell string comprises a plurality of solar cells connected in series; The photovoltaic module further comprises: an interconnection structure located in the interval between adjacent solar cells in the sub-cell string, and realizing the series connection of the adjacent solar cells; The third connection part is electrically connected to at least one interconnection structure in one of the sub-cell strings located in the interval between adjacent solar cells, and the fourth connection part is electrically connected to at least one interconnection structure in the other of the sub-cell strings located in the interval between adjacent solar cells.

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