Photovoltaic module and photovoltaic system

Abstract

The invention discloses a photovoltaic module and a photovoltaic system, the photovoltaic module comprises a plurality of battery pieces, and two adjacent battery pieces are electrically connected through a plurality of external connecting pieces which extend along a first direction and are arranged along a second direction; the battery piece comprises a plurality of battery units and at least one isolation part, every two adjacent battery units are separated through the isolation part and are electrically connected through an inner connecting piece, and each battery unit comprises a plurality of fine grid electrodes which extend in the second direction and are arranged in the first direction; in the first direction, the minimum distance between the first external connection piece connected with the first battery unit in the battery pieces and the second external connection piece connected with the last battery unit in the battery pieces is larger than the width of the isolation part. According to the embodiment of the invention, the end of the first external connection piece and the end of the second external connection piece are spaced by a certain distance, so that short circuit between the end of the first external connection piece and the end of the second external connection piece can be avoided when the placement of the external connection pieces is deviated.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a photovoltaic component and a photovoltaic system. Background Art

[0002] A photovoltaic module includes multiple cell strings, which are made up of multiple cells interconnected by welding ribbons.

[0003] In the related art, the battery cells are usually divided into zones, and battery cells are respectively arranged in each zone. Adjacent battery cells are connected by welding ribbons. However, there is a risk of short circuit between the ends of the heterogeneous welding ribbons. Summary of the Invention

[0004] The present invention provides a photovoltaic module and a photovoltaic system, aiming to at least solve the technical problem in the prior art that short circuit risks are easily generated between the ends of heterogeneous welding ribbons on a solar cell.

[0005] An embodiment of the present invention provides a photovoltaic module, comprising a plurality of cells, wherein two adjacent cells are electrically connected via a plurality of external connectors extending along a first direction and arranged along a second direction;

[0006] The battery cell includes a plurality of battery cells and at least one isolation portion, wherein two adjacent battery cells are separated by the isolation portion and electrically connected by an interconnecting member, and each of the battery cells includes a plurality of fine grid electrodes extending along the second direction and arranged along the first direction;

[0007] Along the first direction, a minimum distance between a first external connection member connected to a first battery cell in the battery slice and a second external connection member connected to a last battery cell in the battery slice is greater than a width of the isolation portion.

[0008] In this embodiment of the present invention, at least one separator divides the cell into at least two battery units, rather than physically dividing the cell into multiple slices. Each cell in the cell is located on a single cell, and there is no physical separation between the cells in a single cell. This eliminates the efficiency loss and high probability of micro-cracks on the cut edges caused by multiple cuts of a single cell. In this embodiment, by dividing the cell into multiple battery units, the length of a single external connector can be shortened, reducing thermal stress concentration and effectively alleviating warping.

[0009] In addition, in an embodiment of the present invention, along the first direction, the minimum distance between the first external connection part connected to the first battery cell in the battery cell and the second external connection part connected to the last battery cell in the battery cell is greater than the width of the isolation portion, and there is a certain spacing distance between the end of the first external connection part and the end of the second external connection part. When the placement of the external connection parts deviates, a short circuit between the end of the first external connection part and the end of the second external connection part can be avoided.

[0010] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the structure of the solar cells and interconnection components in the photovoltaic module provided by the embodiment of the present invention Figure 1 ;

[0012] Figure 2 A schematic structural diagram of a cell in a photovoltaic module provided by an embodiment of the present invention;

[0013] Figure 3 Schematic diagram of the structure of the solar cells and interconnection components in the photovoltaic module provided by the embodiment of the present invention Figure 2 ;

[0014] Figure 4 Schematic diagram of the structure of the solar cells and interconnection components in the photovoltaic module provided by the embodiment of the present invention Figure 3 ;

[0015] Figure 5 A schematic diagram of the connection between two adjacent cells in a photovoltaic module provided by an embodiment of the present invention;

[0016] Figure 6 A schematic diagram of a portion of the structure of a cell in a photovoltaic module provided by an embodiment of the present invention;

[0017] Figure 7 A schematic diagram of the connection between a battery string and a connector in a photovoltaic module provided by an embodiment of the present invention;

[0018] Figure 8 for Figure 7 A magnified schematic diagram of point A in the middle;

[0019] Figure 9 Schematic diagram of the structure of the battery string in the photovoltaic module provided by the embodiment of the present invention Figure 1 ;

[0020] Figure 10 Schematic diagram of the structure of the battery string in the photovoltaic module provided by the embodiment of the present invention Figure 2 ;

[0021] Figure 11 Schematic diagram of the equivalent circuit of the photovoltaic module provided by the embodiment of the present invention Figure 1 ;

[0022] Figure 12 Schematic diagram of the equivalent circuit of the photovoltaic module provided by the embodiment of the present invention Figure 2 ;

[0023] Figure 13 Schematic diagram of the equivalent circuit of the photovoltaic module provided by the embodiment of the present invention Figure 3 .

[0024] Reference numerals:

[0025] 10-battery cell, 11-battery unit, 111-fine grid electrode, 112 bus electrode, 113-bus segment, 12-isolating portion, 13-chamfer, 20-inner connection piece, 21-first sub-segment, 22-second sub-segment, 30-outer connection piece, 31-first outer connection piece, 32-second outer connection piece, 40-connector, 41-edge connector, 50-through hole, 60-battery string, 61-edge battery string, 70-insulating piece. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] Reference Figures 1 to 5 、 Figure 9 and Figure 10 An embodiment of the present invention discloses a photovoltaic module comprising a plurality of electrically connected battery strings, each comprising a plurality of battery cells 10. Adjacent battery cells 10 are electrically connected via a plurality of external connectors 30 extending along a first direction and arranged along a second direction. A battery cell 10 comprises a plurality of battery cells 11 and at least one isolation portion 12. Adjacent battery cells 11 are separated by the isolation portion 12 and electrically connected via an internal connector 20. Each battery cell 11 comprises a plurality of fine grid electrodes 111 extending along the second direction and arranged along the first direction. Along the first direction, the minimum distance between a first external connector 31 connected to the first battery cell 11 in the battery cell 10 and a second external connector 32 connected to the last battery cell 11 in the battery cell 10 is greater than the width of the isolation portion 12.

[0028] Among them, multiple battery strings can be connected in parallel first and then in series, or in series first and then in parallel. The battery cell 10 can be a whole cell, a half cell or multiple split cells. The battery cell 10 can be a back contact battery cell. The front of the back contact battery cell has no electrode, and has the characteristics of low shading loss and beautiful appearance. The battery cell 10 can be an HBC (Heterojunction Back Contact) battery cell, a TBC (TOPCon Back Contact) battery cell, an IBC (Interdigitated Back Contact) battery cell, etc. The battery cell 10 can be a battery cell 10 without a traditional main grid, or a battery cell 10 with a main grid. When the battery cell 10 is a BC battery with a main grid structure, the main grid can be a suspended main grid suspended above an insulating block that isolates opposite electrodes. At this time, the suspended main grids of adjacent battery cells 11 are connected to act as an interconnector 20.

[0029] The first direction can refer to Figures 1 to 4 The direction indicated by the arrow B is perpendicular to the first direction. Figures 1 to 4 The direction indicated by the arrow C in the figure. The external connection component 30 can be a soldering ribbon, conductive tape, a conductive backplane, or the like. For example, the soldering ribbon connects multiple battery cells 10 in series to form a battery string. The soldering ribbon includes a copper core and a tin alloy layer around the outer periphery of the copper core. The copper core of the soldering ribbon may also include base metals such as aluminum and nickel. The plurality of fine grid electrodes 111 include a plurality of positive fine grid electrodes and a plurality of negative fine grid electrodes, which are arranged alternately along the first direction.

[0030] The battery cell 10 is rectangular or square in shape. Multiple battery cells 11 are spaced apart and arranged along a first direction. The number of battery cells 11 in a single battery cell 10 is greater than or equal to two. For example, the number of battery cells 11 in a single battery cell 10 can be two, three, four, five, six, seven, eight, nine, ten, etc. The number of battery cells 11 in a single battery cell 10 is preferably four. Figure 1 、 Figure 2 、 Figure 7 The number of battery cells 11 in a single battery cell 10 is 4. Figure 3 The number of battery cells 11 in a single battery cell 10 is 3. Figure 4 The number of battery cells 11 in a single battery sheet 10 is 2. The number of isolation portions 12 can be the number of battery cells 11 minus one.

[0031] In a battery cell 10, the areas of each battery cell 11 are essentially uniform, with minor variations due to process tolerances allowed. This ensures that the currents of each battery cell 11 are essentially uniform, preventing current mismatch. Naturally, the areas of the battery cells 11 in a battery string or module are also essentially uniform. The battery cells 11 are insulated by separators 12 to prevent leakage. Alternatively, a layer of insulating material can be added to the separators 12 to enhance insulation.

[0032] The external connector 30 connects multiple fine grid electrodes 111 of the first polarity in the battery cells 11 at the edge of one battery cell 10, and connects multiple fine grid electrodes 111 of the second polarity in the battery cells 11 at the edge of an adjacent battery cell 10. The internal connector 20 connects multiple fine grid electrodes 111 of the first polarity in one battery cell 11, and connects multiple fine grid electrodes 111 of the second polarity in an adjacent battery cell 11. The first polarity and the second polarity have opposite conductivity types. In other words, the external connector 30 and the internal connector 20 both function as a series connection.

[0033] The inner connecting member 20 extends in the same direction as the outer connecting member 30, and the arrangement direction of the inner connecting member 20 is the same as the arrangement direction of the outer connecting member 30. In the first direction, the inner connecting member 20 does not extend beyond the edge of the battery cell 10. In the first direction, the outer connecting member 30 extends beyond the edge of the battery cell 10.

[0034] The material of the inner part 20 may be the same as or different from the material of the outer part 30. The inner part 20 may be a welding strip. For example, both the inner part 20 and the outer part 30 may be welded with a welding strip, so that the inner and outer parts can be realized in the same process, saving process and improving the efficiency of component production. The inner part 20 may also be made of electrode slurry. For example, the inner part 20 adopts a suspended main grid, and the outer part 30 adopts a welding strip. The main grid that plays the role of inner connection and the main grid that plays the role of collection on the battery cell 10 are printed synchronously, and have both the function of transmitting and collecting current and the function of inner connection. Such an inner part 20 is similar to the material of the fine grid electrode 111, and the difference in thermal expansion coefficient is small, which can reduce the warping of the BC battery cell caused by the inner part 20.

[0035] Battery cell 11 includes a doped layer comprising multiple P-type doped regions and multiple N-type doped regions, which are arranged alternately along a first direction. A positive fine gate electrode is disposed on the P-type doped region, and a negative fine gate electrode is disposed on the N-type doped region. The doped layers in two adjacent battery cells 11 are separated by an isolation portion 12. No doped layer is disposed on isolation portion 12. The width of isolation portion 12 must be sufficient to effectively separate two adjacent battery cells 11.

[0036] At least one isolation portion 12 divides the battery cell 10 into at least two battery cells 11, rather than physically dividing the battery cell 10 into multiple slices. The boundary line between the isolation portion 12 and the battery cell 11 is the edge line of the doped layer in the battery cell 11 closest to the isolation portion 12. The boundary line between the isolation portion 12 and the battery cell 11 can be referred to Figure 2 、 Figure 4 、 Figure 6 The dotted line in .

[0037] After the cell 10 is divided into at least two battery cells 11, the output parameters of the cell 10 will change. For example, the open-circuit voltage Voc = M × V1, and the short-circuit current Isc = I1 / M. This means that the open-circuit voltage will increase, while the short-circuit current will decrease. This reduction in short-circuit current reduces internal losses, thereby increasing the power of the photovoltaic module. Where V1 and I1 are the open-circuit voltage and short-circuit current of the cell before division into at least two battery cells 11, and M is the number of battery cells 11 in the cell 10.

[0038] In related technologies, photovoltaic modules often use a method of cutting cells in half and then connecting them in series or parallel. Alternatively, some cells may be cut in quarters and then connected in series or parallel. The goal is to reduce the series current, thereby reducing internal losses and increasing power, by cutting a single cell multiple times; and to increase the series voltage by cutting a single cell multiple times. However, multiple cell cutting results in a loss of efficiency and a high probability of micro-cracks on the cut edges.

[0039] In the embodiment of the present invention, at least one separator 12 divides the battery cell 10 into at least two battery cells 11, rather than physically dividing it into multiple slices. Each battery cell 11 in the battery cell 10 is located on a single battery cell 10, and there is no physical separation between the battery cells 11 in a single battery cell 10. This eliminates the efficiency loss caused by multiple cutting of a single battery cell and the high probability of micro-cracks on the cut edges. In this embodiment, by dividing the battery cell 10 into multiple battery cells 11, the length of a single-segment external connector 30 can be shortened, reducing thermal stress concentration and effectively alleviating warping.

[0040] In addition, in an embodiment of the present invention, along the first direction, the minimum distance between the first external connection part 31 connected to the first battery cell 11 in the battery cell 10 and the second external connection part 32 connected to the last battery cell 11 in the battery cell 10 is greater than the width of the isolation portion 12, and there is a certain spacing distance between the end of the first external connection part 31 and the end of the second external connection part 32. When the placement of the external connection part 30 deviates, a short circuit between the end of the first external connection part 31 and the end of the second external connection part 32 can be avoided.

[0041] In some embodiments, reference Figure 1 、 Figure 3 and Figure 4 , the number of battery cells 11 in a single battery slice 10 is greater than or equal to 2. The number of battery cells 11 in a single battery slice 10 can be 2, 3, 4, 5, 6, etc.

[0042] Along the first direction, the minimum distance between the first external connection part 31 and the second external connection part 32 is greater than or equal to twice the width of the isolation part 12. Even if the first external connection part 31 and the second external connection part 32 are separated by the isolation part 12, and the end of the external connection part 30 is at a certain distance from the isolation part 12, the probability of the welding material of the external connection part 30 melting and invading the isolation part 12 can be reduced, thereby reducing the probability of short circuit between the first external connection part 31 and the second external connection part 32 and leakage between the battery cells 11.

[0043] When a single cell 10 has two battery cells 11, the minimum distance between the first external connector 31 and the second external connector 32 along the first direction can be less than or equal to 0.7 times the width of the cell 10. This can prevent the battery cell 11 width from being too small, resulting in the external connector 30 being too short and affecting welding quality.

[0044] In some embodiments, reference Figure 4 A single cell 10 contains two battery cells 11. The external connector 30 is directly electrically connected to the fine grid electrodes 111 of the same polarity, with an insulating member 70 interposed between the external connector 30 and the fine grid electrodes 111 of the opposite polarity. Multiple fine grid electrodes 111 of the same polarity near the isolation portion 12 in the battery cell 11 are connected via a busbar 113. The end of the external connector 30 near the isolation portion 12 is connected to the busbar 113, ensuring that the minimum distance between the first external connector 31 and the second external connector 32 along the first direction is greater than or equal to twice the width of the isolation portion 12.

[0045] In some embodiments, reference Figure 3 , the number of battery cells 11 in a single battery sheet 10 is 3, and along the first direction, the minimum distance between the first external connection member 31 and the second external connection member 32 is greater than twice the width of the isolation portion 12. As another example, referring to Figure 1 The number of battery cells 11 in a single battery sheet 10 is 4, and along the first direction, the minimum distance between the first external connection member 31 and the second external connection member 32 is greater than twice the width of the isolation portion 12.

[0046] In some embodiments, along the first direction, the minimum distance between the external connector 30 and the internal connector 20 is greater than or equal to twice the width of the isolation portion 12. This effectively prevents short circuits between the ends of the external connector 30 and the internal connector 20, even if the placement of the external connector 30 deviates significantly, thereby significantly reducing the likelihood of short circuits between the ends of the external connector 30 and the internal connector 20. When the internal connector 20 is a floating busbar and the external connector 30 is a solder strip, the width of twice the isolation portion 12 can reserve space for the busbar paste to expand, preventing contact between the busbar and the external connector 30.

[0047] Along the first direction, the minimum distance between the outer link member 30 and the inner link member 20 may be less than or equal to four times the width of the isolation portion 12 .

[0048] It should be noted that when the inner part 20 is made of electrode paste, the printing accuracy of the inner part 20 is high and the position is not easy to deviate. Therefore, the minimum distance between the inner parts 20 and the inner parts 20 along the first direction does not need to be designed to be larger, and the minimum distance between the outer part 30 and the inner part 20 along the first direction can be designed to be smaller than the minimum distance between the first outer part 31 and the second outer part 32.

[0049] In some embodiments, a distance d is provided between the end of the external connector 30 and the isolation portion 12, where d is greater than the width of the external connector 30. In this case, during the interconnection process, the solder (tin) at the end of the external connector 30, after melting, is less likely to spread to the isolation portion 12. The external connector 30 may be the first external connector 31 or the second external connector 32.

[0050] In some embodiments, reference Figure 1 and Figure 3 The number of battery cells 11 in a single cell 10 is greater than or equal to three. Compared to two battery cells 11, this can further shorten the length of the single-segment external connector 30, reduce thermal stress concentration, and effectively alleviate warping. The number of battery cells 11 in a single cell 10 can be three, four, five, six, etc.

[0051] Along the first direction, the minimum distance between the first external connection part 31 and the second external connection part 32 is greater than 1 / 2 of the spacing of the inner connection part 20 along the second direction, and the minimum distance between the first external connection part 31 and the second external connection part 32 is significantly increased. Moreover, along the first direction, the first external connection part 31 and the second external connection part 32 are separated by the inner connection part 20, and there is no possibility of short circuit between the end of the first external connection part 31 and the end of the second external connection part 32.

[0052] As an example, refer to Figure 3, the number of battery cells 11 in a single battery sheet 10 is 3, and along the first direction, the minimum distance between the first external connection member 31 and the second external connection member 32 is greater than 1 / 2 of the spacing of the internal connection members 20 along the second direction, and less than the length of one internal connection member 20. As another example, referring to Figure 1 The number of battery cells 11 in a single battery cell 10 is 4, and along the first direction, the minimum distance between the first external connection member 31 and the second external connection member 32 is greater than the length of one internal connection member 20.

[0053] In some embodiments, reference Figure 1 and Figure 3 Along the first direction, the ends of the multiple first external connection parts 31 connected to the first battery cell 11 in the battery cell 10 are aligned, and the ends of the multiple second external connection parts 32 connected to the last battery cell 11 in the battery cell 10 are aligned.

[0054] Among them, along the first direction, the two ends of the multiple first external connecting parts 31 connected to the first battery cell 11 in the battery cell 10 are aligned, and the two ends of the multiple second external connecting parts 32 connected to the last battery cell 11 in the battery cell 10 are aligned. When the external connecting parts 30 are welding strips, for the multiple welding strips of a battery cell 10, the cutting position and cutting length are the same, and the manufacturing difficulty is greatly reduced. After the stringing machine pulls out multiple welding strips of the length of the battery string, the welding strips can be cut at the same position, and there is no need to design different cutting positions for each welding strip. For example, the 18 long welding strips used in the battery string of 12 battery cells can be cut or cut at 11 positions after the 18 long welding strips of the length of the battery string are pulled out. For the 18 welding strips pulled out of the battery string, each welding strip is interrupted at the same position, which is more convenient to operate.

[0055] In some embodiments, reference Figure 1 、 Figure 5 、 Figure 7 and Figure 9 , the number of battery cells 11 in a single battery cell 10 is an even number; the multiple first external connection parts 31 connected to the first battery cell 11 in the battery cell 10 are respectively aligned in the first direction with the multiple second external connection parts 32 connected to the last battery cell 11 in the battery cell 10.

[0056] The internal and external connectors 20, 30 are collectively referred to as interconnects. The external connector 30 can be an even-numbered interconnect. Along a first direction, multiple battery cells 10 are connected in series to form a battery string 60, with two adjacent battery strings 60 connected by connectors 40. The multiple first external connectors 31 and the multiple second external connectors 32 are aligned in the first direction. That is, on the battery cell 10, the first external connectors 31 and the second external connectors 32 are aligned in the extending direction, without misalignment.

[0057] Reference Figure 7For example, along the first direction, in two battery strings 60 connected to the connector 40 at upper and lower positions, multiple external connectors 30 in the upper battery string 60 are connected to the connector 40, and multiple external connectors 30 in the lower battery string 60 are connected to the connector 40. In this embodiment, when the two battery strings 60 are connected to the connector 40, the external connectors 30 in the upper and lower parts are aligned in the first direction. For another example, Figure 1 and Figure 5 As shown, the first external connection part 31 and the second external connection part 32 of a battery cell 10 are aligned in the first direction, that is, the extension direction of the external connection part 30. In the process of pulling and making the welding strips, the number of long welding strips required is relatively small, and the number of welding strips cut and discarded is also relatively small, which greatly reduces the process difficulty and process time.

[0058] In some embodiments, along the first direction, the distance between the outer link 30 and the inner link 20 is 3 mm to 15 mm.

[0059] The battery cell 10 has pads electrically connected to the fine grid electrode 111. The pads are located at least in the first and last battery cells 11, and are used to connect at least to the external connector 30. The pads in the battery cell 11 include end pads, i.e., pads located near both ends of the battery cell 11 along the first direction.

[0060] The spacing between the external connector 30 and the internal connector 20 can be 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, or 15mm. In this embodiment, the spacing between the external connector 30 and the internal connector 20 along the first direction is reasonably designed to avoid short circuits caused by too small a spacing, and to reduce the risk of the external connector 30 not being able to connect to the end pads on the battery cell 11 near the isolation portion 12 due to too large a spacing, thereby improving the problem of poor collection efficiency caused by the end pads, external connector 30, and internal connector 20 being too close together.

[0061] In some embodiments, all battery cells 11 have solder pads. Some of the solder pads in the battery cell 10 are used to connect to the external connector 30, and some of the solder pads are used to connect to the internal connector 20. A distance a is defined between the tail solder pad of the preceding battery cell 11 and the head solder pad of the succeeding battery cell 11. Along the first direction, the distance between the external connector 30 and the internal connector 20 is less than the distance a.

[0062] The tail pad of the preceding battery cell 11 is the end pad of the preceding battery cell 11 close to the subsequent battery cell 11, and the head pad of the subsequent battery cell 11 is the end pad of the subsequent battery cell 11 close to the preceding battery cell 11. In this embodiment, the spacing between the external connector 30 and the internal connector 20 is less than the distance a. At the spacing between the external connector 30 and the internal connector 20, at least one of the internal connector 20 and the external connector 30 extends beyond the end pad, thereby better ensuring the connection reliability between the internal connector 20, the external connector 30 and the pads.

[0063] In some embodiments, along the first direction, the minimum distance between the first external connection part 31 connected to the first battery cell 11 in the battery cell 10 and the second external connection part 32 connected to the last battery cell 11 in the battery cell 10 is greater than or equal to 5 mm and less than or equal to 0.7 times the size of the battery cell 10 in the first direction.

[0064] On the one hand, the distance between the end of the first external connection member 31 and the end of the second external connection member 32 is greater than or equal to 5 mm. This can prevent short circuits between the ends of the first external connection member 31 and the second external connection member 32 when the external connection member 30 is misplaced. On the other hand, the minimum distance between the first external connection member 31 and the second external connection member 32 is less than or equal to 0.7 times the dimension of the battery cell 10 in the first direction. This ensures sufficient overlap between the first external connection member 31, the second external connection member 32 and the battery cell 10, thereby ensuring the reliability of the connection between the first external connection member 31, the second external connection member 32 and the battery cell 10.

[0065] In some embodiments, reference Figure 1 Along the first direction, the minimum distance between the first external connector 31 connected to the first battery cell 11 in the battery cell 10 and the second external connector 32 connected to the last battery cell 11 in the battery cell 10 is greater than the length of one internal connector 20. Along the first direction, the internal connector 20 is closest to the first external connector 31 or the second external connector 32, and there is no possibility of short circuit between the end of the first external connector 31 and the end of the second external connector 32.

[0066] In some embodiments, reference Figure 7 and Figure 8 , the number of battery cells 11 in a single battery cell 10 is an even number, the internal connecting parts 20 and the external connecting parts 30 are collectively referred to as interconnecting parts, and the number of interconnecting parts of the battery cell 11 is an odd number; the photovoltaic module also includes a plurality of connecting parts 40 arranged at intervals along the second direction, along the first direction, a plurality of battery cells 10 are connected in series to form a battery string 60, and two adjacent battery strings 60 are connected by the connecting parts 40; along the second direction, the external connecting part at the tail of the previous battery string and the external connecting part at the head of the next battery string have a distance x, and the external connecting part 30 and the internal connecting part 20 in a battery cell 11 have a distance y, and x is greater than or equal to 2y, so as to increase the isolation distance between the external connecting parts 30 of opposite sex on adjacent strings, and at the same time avoid mutual interference between the bending parts of the external connecting parts 30 and the connecting parts 40.

[0067] For a battery cell 11 connected to both an external connector 30 and an internal connector 20, the number of external connectors 30 and internal connectors 20 connected thereto is an odd number. For a battery cell 11 connected only to an internal connector 20, the number of internal connectors 20 connected thereto is an odd number. The photovoltaic module also includes a backsheet or back glass, which has a through hole 50 formed therein, through which the end of the connector 40 is led.

[0068] The tail external connector of the previous battery string refers to the external connector 30 connected to the battery cell 11 close to the connector 40 in the previous battery string connected to the connector 40, the next battery string refers to the next battery string 60 adjacent to the previous battery string in the second direction, and the head external connector of the next battery string refers to the external connector 30 adjacent to the tail external connector of the previous battery string in the second direction.

[0069] For example, Figure 8 , along the second direction, the distance x between the tail external connection piece of the previous battery string and the head external connection piece of the next battery string can be referred to Figure 8 The distance y between the outer link 30 and the inner link 20 can be referred to Figure 8 In the second direction, the string spacing between the previous battery string and the next battery string can be referred to Figure 8 In the example, D, x is greater than the sum of 2y and D. Along the second direction, the distance between two adjacent external connectors 30 in two adjacent battery strings 60 is greater than or equal to twice the spacing between the external connector 30 and the internal connector 20. This greater distance between two adjacent external connectors 30 in two adjacent battery strings 60 can avoid the risk of short circuits.

[0070] In some embodiments, reference Figure 7 Along the second direction, the plurality of connectors 40 include an edge connector 41 located near the edge of the photovoltaic module, and the cell string 60 includes an edge cell string 61 located near the edge of the photovoltaic module. Along the second direction, a distance m is defined between the edge connector 41 and the edge of the photovoltaic module, and a distance n is defined between the edge cell string 61 and the edge of the photovoltaic module, where m is greater than n. A distance b is defined between the end of the edge connector 41 located near the edge of the photovoltaic module and the side of the edge cell string 61 located near the edge of the photovoltaic module, where b is less than or equal to the spacing between the inner links 20 in the second direction.

[0071] If m is greater than n, it means that the end of the edge connector 41 close to the edge of the photovoltaic module is located inside the side of the edge battery string 61 close to the edge of the photovoltaic module. The distance b between the end of the edge connector 41 close to the edge of the photovoltaic module and the outer edge 611 of the edge battery string 61 can be referred to Figure 7The spacing b shown in the figure, "internal connector 20 spacing," refers to the spacing between two adjacent internal connectors 20 along the second direction. In this embodiment, a certain distance exists between the end of the edge connector 41 near the edge of the photovoltaic module and the outer edge 611 of the edge cell string 61, which facilitates shortening the length of the edge connector 41. When b is less than or equal to the spacing b between the internal connectors 20 in the second direction, sufficient space is ensured between the outer connector 30 near the module edge and the end of the edge connector 41, ensuring reliable welding.

[0072] In some embodiments, reference Figure 7 , multiple external connecting parts 30 and multiple internal connecting parts 20 connected to the battery cell 10 are all located on the same side of the battery cell 10 along the thickness direction; multiple battery cells 10 are connected into a battery string 60 through the external connecting parts 30, and the multiple battery strings 60 are electrically connected through the connecting parts 40; multiple external connecting parts 30 connected to the connecting parts 40 are all located on the same side of the connecting parts 40 along the thickness direction.

[0073] The multiple external connectors 30 and the multiple internal connectors 20 are all located on the backlight side of the cell 10. In this embodiment, the multiple external connectors 30 connected to the cell 10 are all located on the backlight side of the cell 10, and the multiple external connectors 30 connected to the connector 40 are all located on the same side of the connector 40 along the thickness direction, which facilitates the arrangement and welding of the external connectors 30. For the production of battery strings and modules, only single-sided operations are required, greatly improving module production efficiency.

[0074] In some embodiments, reference Figure 5 、 Figure 7 and Figure 9 The photovoltaic module includes multiple battery strings 60, multiple battery cells 10 are connected in series to form a battery string 60, and the battery strings 60 are connected in series and parallel; the electrode patterns of each battery cell 10 in the battery string 60 are the same and arranged in the same direction; the structure of each battery string 60 is the same.

[0075] The battery cell 10 has a chamfer 13 on one side, and the sides of the battery cells 10 with the chamfer 13 face the same direction in the battery string 60. In the battery string 60, the side of one of the two adjacent battery cells 10 with the chamfer 13 faces the side of the other battery cell 10 without the chamfer 13.

[0076] Reference Figure 10When the number of battery cells 11 in a single battery cell 10 is odd, adjacent battery cells 10 in the battery string 60 are symmetrical, with the sides of the adjacent battery cells 10 without chamfers 13 facing each other. This means that when multiple battery cells 10 are arranged in a battery string 60, the adjacent battery cells 10 need to be rotated 180°. In this embodiment, the electrode patterns of each battery cell 10 in the battery string 60 are identical and arranged in the same direction. This eliminates the need for 180° rotation when arranging multiple battery cells 10 in the battery string 60, significantly improving production efficiency.

[0077] The structures of the battery strings 60 are the same, and there is no need to set up battery strings 60 with different structures, such as battery string A and battery string B. There is no need to distinguish different battery strings 60 during production, which can greatly improve production efficiency.

[0078] In some embodiments, the inner link 20 is made of electrode paste, or the inner link 20 is a welding strip; the outer link 30 is a welding strip.

[0079] The soldering strip may be a tinned copper soldering strip, a tinned alloy soldering strip, or the like. The inner link 20 is specifically formed by firing a non-burn-through electrode paste. The electrode paste used in the inner link 20 may be the same as or different from the electrode paste used in the fine gate electrode 111. The inner link 20 is made of the electrode paste, and the printing accuracy of the inner link 20 is high. The position is not easily deviated, and the distance between the inner links 20 along the first direction is easy to control, thereby avoiding short circuits between the ends of adjacent inner links 20.

[0080] As an example, the inner connecting member 20 and the outer connecting member 30 are both welding strips. Figure 6 The battery cell 11 further includes a bus electrode 112 electrically connected to the fine grid electrode 111. The bus electrode 112 is welded or low-temperature conductively bonded to the welding ribbon. A pad is provided on the bus electrode 112 for connecting to the internal connection member 20 or the external connection member 30.

[0081] The busbar electrodes 112 are divided into positive busbar electrodes and negative busbar electrodes. Multiple positive busbar electrodes and multiple negative busbar electrodes in a single battery cell 11 are arranged alternately along the second direction. In two adjacent battery cells 11, the positive busbar electrode in one battery cell 11 faces the negative busbar electrode in the other battery cell 11, and the negative busbar electrode in one battery cell 11 faces the positive busbar electrode in the other battery cell 11.

[0082] As another example, the inner connecting member 20 is made of electrode paste, and the outer connecting member 30 is a welding strip. Figure 4The internal connector 20 is electrically connected to the first polarity fine gate electrode 111 in the previous cell 10 and to the second polarity fine gate electrode 111 in the next cell 10. An insulating member 70 is provided between the second polarity fine gate electrode 111 in the previous cell 10 and the first polarity fine gate electrode 111 in the next cell 10. Similarly, the external connector 30 is connected in series.

[0083] The connection method between the fine grid electrode 111 and the external connection part 30 can be welding, low-temperature conductive bonding, etc. The fine grid electrode 111 may include a thin wire and a thickened section, and the thickened section is used to connect the external connection part 30 or the internal connection part 20. The insulating part can be an insulating glue. At least most of the fine grid electrodes 111 can be continuous electrodes. Multiple fine grid electrodes 111 of the same polarity near the isolation part 12 in the battery cell 11 are connected through the bus section 113, and the end of the external connection part 30 near the isolation part 12 is connected to the bus section 113, and the multiple opposite-polarity fine grid electrodes 111 at the bus section 113 are interrupted at the bus section 113.

[0084] As another example, the interconnect 20 is made of electrode paste, and the interconnect 20 is directly electrically connected to the fine gate electrode 111 of the same sex, and the fine gate electrode 111 of the opposite sex is interrupted at the interconnect 20. At this time, there is no need to set an insulating part 70 between the interconnect 20 and the fine gate electrode 111 of the opposite sex.

[0085] In some embodiments, the internal connection parts 20 and the external connection parts 30 are collectively referred to as interconnecting parts. The number of interconnecting parts connected to a single battery cell 11 is 16-24, which can effectively improve the collection efficiency of the current in the battery cell 11.

[0086] For a battery cell 11 connected to both external interconnecting components 30 and internal interconnecting components 20, the number of external interconnecting components 30 and internal interconnecting components 20 connected thereto is 16-24. For a battery cell 11 connected only to internal interconnecting components 20, the number of internal interconnecting components 20 connected thereto is 16-24. The number of interconnecting components connected to a single battery cell 11 can be 16, 17, 19, 21, 23, 24, etc.

[0087] In some embodiments, the ratio of the length of the battery cell 10 along the second direction to the width of the battery cell 10 along the first direction is 1-2.6. The ratio of the length of the battery cell 10 along the second direction to the width of the battery cell 10 along the first direction can be 1, 1.5, 2, 2.53, 2.6, etc. In this case, the aspect ratio of the battery cell 10 is relatively large, and while meeting the width requirements of the module, the number of battery cells 10 in the module length direction and the area of ​​the battery unit 11 can be flexibly adjusted.

[0088] In some embodiments, the length of the cell 10 along the second direction is 182 mm to 230 mm; the width of the cell 10 along the first direction is 91 mm to 230 mm. Specifically, the length of the cell 10 along the second direction can be 182 mm, 192 mm, 210 mm, 230 mm, etc. The width of the cell 10 along the first direction can be 91 mm, 105 mm, 182 mm, 230 mm, etc. Cells 10 of this size not only take into account the area for high light conversion efficiency, but also take into account the size of the assembly for easy transportation and handling.

[0089] In some embodiments, reference Figure 1 and Figure 3 The interconnect member 20 includes a first subsegment 21 and a second subsegment 22, respectively connecting two adjacent battery cells 11. Along a first direction, the first subsegment 21 and the second subsegment 22 are collinear. The first subsegment 21 is the portion of the interconnect member 20 located on one of the battery cells 11, and the second subsegment 22 is the portion of the interconnect member 20 located on the other battery cell 11. In this embodiment, the interconnect member 20 is long and linearly arranged, facilitating printing or routing of the interconnect member 20 and reducing the probability of wire breakage and resistance variations.

[0090] In some embodiments, the external connector 30 is a soldering ribbon that is welded to the battery cell 10, and the internal connector 20 is adhered and cured on the battery cell 10. The internal connector 20 is made of electrode slurry and is formed on the surface of the battery cell 10 by printing. After printing and processing, the internal connector 20 is adhered and cured on the battery cell 10. The printing precision of the internal connector 20 is high, and the position is not easily deviated.

[0091] In some embodiments, the length of the inner connecting member 20 is greater than that of the outer connecting member 30. The shorter length of the outer connecting member 30 can effectively reduce the degree of warping of the battery cell 10 caused by welding the outer connecting member 30.

[0092] In some embodiments, the length of the external connector 30 is less than or equal to 2 / 3 of the dimension of the battery cell 10 along the first direction. The shorter length of the external connector 30 can effectively reduce the degree of warping of the battery cell 10 caused by welding the external connector 30.

[0093] In some embodiments, external connectors 30 of different polarities are located on the same side of the battery cell 10 , which facilitates the arrangement and welding of the external connectors 30 .

[0094] In some embodiments, along the first direction, the width of the isolation portion 12 is 140 μm-5000 μm. On the basis of ensuring isolation performance, the width of the isolation portion 12 is not too large to avoid excessive area in the battery cell 10 being wasted.

[0095] Reference Figure 11, along the first direction, two adjacent battery strings 60 are connected in parallel through the connector 40. Figure 12 , along the first direction, two adjacent battery strings 60 are connected in series to form a first battery long string shown in E1, and multiple first battery long strings are connected in parallel. Figure 13 Along the first direction, three battery strings 60 arranged in sequence are connected in series to form a second long battery string shown as E2, and multiple second long battery strings are connected in parallel. Figures 11 to 13 The direction indicated by the arrow B is the first direction, that is, the extension direction of the external connection member 30 .

[0096] An embodiment of the present invention further provides a photovoltaic system, which includes the photovoltaic assembly of any one of the above embodiments or a combination of multiple embodiments.

[0097] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0098] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the purpose and scope of protection of the present invention, which are all protected by the present invention.

Claims

1. A photovoltaic module, characterized in that: It comprises a plurality of battery cells, wherein two adjacent battery cells are electrically connected via a plurality of external connecting members extending along a first direction and arranged along a second direction; The battery cell comprises a plurality of battery cells and at least one isolation portion, wherein two adjacent battery cells are separated by the isolation portion and electrically connected via an interconnecting member, and each of the battery cells comprises a plurality of fine grid electrodes extending along the second direction and arranged along the first direction; Along the first direction, a minimum distance between a first external connection member connected to a first battery cell in the battery slice and a second external connection member connected to a last battery cell in the battery slice is greater than a width of the isolation portion.

2. The photovoltaic module according to claim 1, characterized in that The number of battery cells in a single battery cell is greater than or equal to 2; Along the first direction, the minimum distance between the first external connection member and the second external connection member is greater than or equal to twice the width of the isolation portion; And / or, a distance d is provided between the end of the external connection member and the isolation portion, and d is greater than a width of the external connection member; And / or, along the first direction, the minimum distance between the outer link component and the inner link component is greater than or equal to twice the width of the isolation portion.

3. The photovoltaic module according to claim 1, characterized in that The number of battery cells in a single battery cell is greater than or equal to 3; Along the first direction, a minimum distance between the first outer connecting member and the second outer connecting member is greater than 1 / 2 of a spacing between the inner connecting members along the second direction.

4. The photovoltaic module according to claim 1, characterized in that Ends of the plurality of first external connection members connected to the first battery cell in the battery slice are aligned, and / or ends of the plurality of second external connection members connected to the last battery cell in the battery slice are aligned; and / or, the number of the battery cells in a single battery slice is an even number; The plurality of first external connection members connected to the first battery cell in the battery slice are respectively aligned in the first direction with the plurality of second external connection members connected to the last battery cell in the battery slice.

5. The photovoltaic module according to claim 1, characterized in that Along the first direction, the distance between the outer link and the inner link is 3 mm to 15 mm; And / or, a distance a is defined between the tail pad of the preceding battery cell and the head pad of the succeeding battery cell, and along the first direction, a distance between the outer connector and the inner connector is less than the distance a; and / or, along the first direction, a minimum distance between a first external connection member connected to a first battery cell in the battery cell and a second external connection member connected to a last battery cell in the battery cell is greater than or equal to 5 mm and less than or equal to 0.7 times the size of the battery cell in the first direction; And / or, along the first direction, a minimum distance between a first external connection member connected to a first battery cell in the battery slice and a second external connection member connected to a last battery cell in the battery slice is greater than a length of an internal connection member.

6. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The number of the battery cells in a single battery sheet is an even number, the internal connection parts and the external connection parts are collectively referred to as interconnection parts, and the number of the interconnection parts of the battery cells is an odd number; The photovoltaic assembly further includes a plurality of connectors arranged at intervals along the second direction, wherein along the first direction, a plurality of the battery cells are connected in series to form a battery string, and two adjacent battery strings are connected by the connectors; Along the second direction, the outer connector at the tail of the preceding battery string is spaced apart from the outer connector at the head of the following battery string. The outer connector and the inner connector in a battery cell are spaced apart apart from each other by a distance y, where x is greater than or equal to 2y.

7. The photovoltaic module according to any one of claims 1 to 5, characterized in that: Along the second direction, the plurality of connectors include edge connectors close to an edge of the photovoltaic module, and the cell string includes an edge cell string close to an edge of the photovoltaic module; Along the second direction, a distance m is between the edge connector and the edge of the photovoltaic module, a distance n is between the edge cell string and the edge of the photovoltaic module, and m is greater than n; And / or, a distance b is defined between an end of the edge connector close to the edge of the photovoltaic module and a side of the edge cell string close to the edge of the photovoltaic module, and b is less than or equal to a spacing between the inner connecting members in the second direction.

8. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The plurality of external connection parts and the plurality of internal connection parts connected to the battery cell are all located on the same side of the battery cell in the thickness direction; The plurality of battery cells are connected to form a battery string via the external connection piece, and the plurality of battery strings are electrically connected via a connector; the plurality of external connection pieces connected to the connector are all located on the same side of the connector along the thickness direction.

9. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The internal connection parts and the external connection parts are collectively referred to as interconnection parts, and the number of the interconnection parts connected to a single battery cell is 16-24.

10. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The ratio of the length of the battery cell along the second direction to the width of the battery cell along the first direction is 1-2.6; And / or, the length of the battery cell along the second direction is 182 mm to 230 mm; And / or, the width of the battery cell along the first direction is 91 mm-230 mm.

11. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The inner link comprises a first sub-segment and a second sub-segment respectively connecting two adjacent battery cells. Along the first direction, the first sub-segment and the second sub-segment are on the same straight line.

12. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The external connection part is a welding strip, which is welded to the battery cell, and the internal connection part is attached and solidified on the battery cell; And / or, the length of the external connection member is less than or equal to 2 / 3 of the dimension of the battery cell along the first direction.

13. The photovoltaic module according to any one of claims 1 to 5, characterized in that: Along the first direction, the width of the isolation portion is 140 μm-5000 μm.

14. A photovoltaic system, characterized in that: A photovoltaic module comprising the photovoltaic module according to any one of claims 1 to 13.

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