Photovoltaic cell module, photovoltaic cell string, cell string array, and photovoltaic cell assembly

Abstract

The utility model provides a photovoltaic cell module, a photovoltaic cell string, a cell string array and a photovoltaic cell assembly, relates to the field of photovoltaic technology, and aims to solve the technical problem of complex typesetting caused by a large number of photovoltaic cell slices. The photovoltaic cell module comprises two cell units connected in series, each cell unit comprises a plurality of cell fragments connected in parallel, a plurality of first electrodes and corresponding second electrodes are distributed on each cell fragment, and the first electrodes and the second electrodes are alternately arranged on the corresponding cell fragments; in the same battery unit, the positions of the first electrodes of different battery fragments in the preset direction are the same, and the positions of the second electrodes of different battery fragments in the preset direction are the same; one of the two battery units is provided with a first electrode, and the position of the second electrode in the other battery unit is the same as the position of the first electrode in the preset direction. According to the photovoltaic cell module, the complex layout of the multi-cut cell fragments is simplified, and the assembly power is improved.

Description

Technical Field

[0001] The utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic cell module, a photovoltaic cell string, a cell string array, and a photovoltaic cell assembly. Background Art

[0002] The statements in this section merely provide background technology related to the present invention and do not necessarily constitute prior art.

[0003] In the photovoltaic field, the size of cells is getting bigger and bigger, which can make a single module obtain higher output power. Since the current generated by the cell is related to its own area, large-size sliced ​​cells increase the module current while increasing the module power, which significantly increases the series resistance loss generated during the current transmission process and reduces the packaging efficiency of the battery module.

[0004] In the related art, the whole cell is cut into half to reduce the series resistance loss. However, as the size of the cell gets larger, even if it is cut into half, it still causes a lot of series resistance loss. Further increasing the number of slices will make the layout of the cell slices complicated. Utility Model Content

[0005] The utility model aims to provide a photovoltaic cell module, a photovoltaic cell string, a cell string array, and a photovoltaic cell assembly to solve the technical problem of complex layout caused by a large number of photovoltaic cell slices.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] In a first aspect, the utility model provides a photovoltaic cell module, comprising two battery units connected in series, wherein the battery unit comprises a plurality of battery slices connected in parallel, wherein a plurality of first electrodes and corresponding second electrodes are distributed on the battery slices, and the first electrodes and the second electrodes are alternately arranged on the corresponding battery slices;

[0008] In the same battery unit, the first electrodes of different battery slices have the same position in the preset direction, and the second electrodes of different battery slices have the same position in the preset direction;

[0009] The first electrode of one of the two battery cells is located at the same position in the preset direction as the second electrode of the other battery cell;

[0010] The preset direction refers to the distribution direction from the first electrode to the second electrode on the same battery slice.

[0011] According to at least one embodiment of the present invention, the number of battery slices in the two battery units is n, and the battery slices are prepared by dividing a whole battery sheet into n pieces, where n is an even number and n≥4.

[0012] According to at least one embodiment of the present utility model, in the same battery unit, at the same position in the preset direction, the first electrodes of different battery slices are electrically connected, and the second electrodes of different battery slices are electrically connected.

[0013] According to at least one embodiment of the utility model, at the same position in the preset direction, among the two battery cells, the first electrode of one battery cell is electrically connected to the second electrode of the other battery cell, and the second electrode is disconnected from the first electrode of the other battery cell.

[0014] According to at least one embodiment of the present utility model, in the same battery unit, there is a first gap between two adjacent battery slices, and there is a second gap between two battery units.

[0015] According to at least one embodiment of the present utility model, in the same battery unit, there is a first negative spacing between two adjacent battery slices, and there is a second negative spacing or a third gap between two battery units.

[0016] In a second aspect, the utility model provides a photovoltaic cell string, comprising a plurality of photovoltaic cell module groups connected in series, wherein the plurality of photovoltaic cell module groups are distributed along a preset direction;

[0017] The photovoltaic cell module group includes at least one photovoltaic cell module, and the photovoltaic cell module is the cell module according to any one of the first aspects;

[0018] When the photovoltaic cell module group includes a plurality of photovoltaic cell modules, each of the photovoltaic cell modules is connected in series.

[0019] According to at least one embodiment of the present utility model, the photovoltaic cell module group has two opposite ends, and the photovoltaic cell module group further includes two bus bars located at the corresponding ends, and each of the first electrodes of the cell segments located at one end is electrically connected to one of the two bus bars;

[0020] Each of the second electrodes of the battery slice located at the other end is electrically connected to the other of the two bus bars;

[0021] The bus bar at one end of one of the two adjacent photovoltaic cell module groups is electrically connected to the bus bar at the corresponding end of the other photovoltaic cell module group.

[0022] In a third aspect, the utility model provides a battery string array, comprising a plurality of photovoltaic battery strings connected in parallel, at least one of the photovoltaic battery strings being the photovoltaic battery string described in the second aspect.

[0023] In a fourth aspect, the utility model provides a photovoltaic cell assembly, comprising the cell string array described in the third aspect.

[0024] Among the one or more technical solutions provided in the exemplary embodiments of the present utility model, at least one of the following beneficial effects can be achieved.

[0025] The photovoltaic cell module of the exemplary embodiment of the utility model includes two battery cells connected in series, wherein the battery cell includes a plurality of battery slices connected in parallel, that is, the photovoltaic cell module includes at least four battery slices, which greatly reduces the series resistance loss compared to the half-slice assembly form in the prior art, thereby improving the packaging efficiency of the battery assembly. Furthermore, an equal number of first electrodes and second electrodes are distributed on each battery slice, and the two are distributed alternately. In the same battery cell, the distribution positions of the first electrodes and the second electrodes on different battery slices are the same, that is, the positions of the first electrodes on different battery slices in the preset direction are the same, and the positions of the second electrodes on different battery slices in the preset direction are also the same, or in other words, the first electrodes of different battery slices correspond one-to-one, and the second electrodes of different battery slices correspond one-to-one; in two battery cells, the first electrode of one battery cell and the second electrode of the other battery cell have the same position in the preset direction, that is, the first electrodes of different battery cells correspond to the second electrodes, and the second electrodes correspond to the first electrodes. Based on this, a parallel electrical connection can be formed between different battery slices of the same battery cell, and a series electrical connection can be formed between different battery cells. This layout method, especially the formation of a series electrical connection between different battery cells, is the same as the conventional half-cell assembly layout method. Compared with the complex layout method of multiple slices in the prior art, it simplifies the circuit layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings illustrate exemplary embodiments of the present invention and are used to explain the principles of the present invention together with the description thereof, wherein these drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification;

[0027] Figure 1 It is a schematic diagram of the structure of a battery string array (half cell) in the prior art;

[0028] Figure 2yes Figure 1 Schematic diagram of the structure of the photovoltaic cell module (without interconnection strips);

[0029] Figure 3 yes Figure 1 Schematic diagram of the structure of the photovoltaic cell module (with interconnection strips);

[0030] Figure 4 It is a schematic diagram of the structure of a battery string array (1 / 4 slice) according to an embodiment of the utility model;

[0031] Figure 5 yes Figure 4 Schematic diagram of the structure of the photovoltaic cell module (without interconnection strips);

[0032] Figure 6 yes Figure 4 Schematic diagram of the structure of the photovoltaic cell module (with interconnection strips);

[0033] Figure 7 It is a schematic diagram of the structure of a battery string array (1 / 6 piece) according to an embodiment of the utility model;

[0034] Figure 8 yes Figure 7 Schematic diagram of the structure of the photovoltaic cell module (without interconnection strips);

[0035] Fig. 9 yes Figure 7 Schematic diagram of the structure of the photovoltaic cell module (with interconnection strips);

[0036] Fig.10 It is a schematic diagram of the exploded structure of a photovoltaic cell assembly according to an embodiment of the utility model.

[0037] Figure numerals: 100, photovoltaic cell module; 110, first battery unit; 111, first battery slice; 112, second battery slice; 113, sixth battery slice; 120, second battery unit; 123, third battery slice; 124, fourth battery slice; 125, fifth battery slice; 200, photovoltaic cell module group; 300, photovoltaic cell string; 401, first electrode; 402, second electrode; 501, first interconnection bar; 502, second interconnection bar; 600, bus bar; 701, battery string array; 702, encapsulation film; 703, back panel; 704, front panel glass. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] Increasing the size of photovoltaic cells can enable a single module to obtain higher output power, for example, expanding from 156mm to 182mm or even 210mm. Since the current generated by the cell is related to the area of ​​the cell, large-sized sliced ​​cells increase the module power while also increasing the module current, which increases the series resistance loss generated during the current transmission process. In related technologies, the series resistance loss is reduced by cutting into half cells, but for large-sized cells, half-cell cells will still cause a lot of series resistance loss. Using more sliced ​​cells will cause defects such as complex layout and busbar connection and asymmetric structure. Even if the conventional half-cell layout method is used, please refer to Figure 1-Figure 3 As shown in the figure, due to the increase in the size of the battery cell, the width of the component product is different from that of the conventional component product, which makes the production process of raw materials such as glass and the finished component more difficult, making it difficult to achieve mass production, and the reliability risk such as load resistance is high. Figure 1 It is a schematic diagram of the structure of a battery string array (half cell) in the prior art; Figure 2 yes Figure 1 Schematic diagram of the structure of the photovoltaic cell module (without interconnection strips); Figure 3 yes Figure 1 Schematic diagram of the structure of the photovoltaic cell module (with interconnection strips).

[0040] It can be seen from the above that the more sliced ​​battery cells in the related art have a complex circuit layout on the basis of reducing series resistance loss.

[0041] In response to the above problems, the photovoltaic cell module provided by the exemplary embodiment of the utility model is electrically connected by connecting two battery cells in series, wherein each battery cell includes multiple battery slices, and the first electrode and the second electrode on each battery slice in the same battery cell are distributed at the same position. The battery slices in the same battery cell are electrically connected in parallel, thereby forming a layout method similar to half-cell battery slices in the prior art. On the basis of reducing series resistance loss, the conventional layout method of half-cell battery slices is combined to effectively simplify the circuit layout of more battery slices.

[0042] Figure 4 It is a schematic diagram of the structure of a battery string array (1 / 4 slice) according to an embodiment of the utility model; Figure 5 yes Figure 4 Schematic diagram of the structure of the photovoltaic cell module (without interconnection strips). Figure 4 and Figure 5As shown, the photovoltaic cell module 100 provided by the exemplary embodiment of the utility model includes two battery cells connected in series, and the battery cell includes two battery slices connected in parallel, and a plurality of first electrodes 401 and corresponding second electrodes 402 are distributed on the battery slices, and the first electrodes 401 and the second electrodes 402 are alternately arranged on the corresponding battery slices; in the same battery cell, the first electrodes 401 of different battery slices have the same position in a preset direction, and the second electrodes 402 of different battery slices have the same position in the preset direction; the first electrode 401 of one of the two battery cells has the same position in the preset direction as the second electrode 402 of the other battery cell; the preset direction refers to the distribution direction from the first electrode 401 to the second electrode 402 on the same battery slice.

[0043] like Figure 4 and Figure 5 As shown, in the two battery cells connected in series in the photovoltaic battery module 100, the battery cell located at the top is defined as the first battery cell 110, and the battery cell located at the bottom is defined as the second battery cell 120, wherein the two battery slices in the first battery cell 110 are respectively defined as the first battery slice 111 located at the top and the second battery slice 112 located at the bottom; the two battery slices in the second battery cell 120 are respectively defined as the third battery slice 123 located at the top and the fourth battery slice 124 located at the bottom. It should be noted that the above-mentioned top and bottom are Figure 4 or Figure 5 The upper and lower position relationship on the paper is only for the convenience of description and does not mean the absolute position of each component.

[0044] In practical applications, the first battery slice 111, the second battery slice 112, the third battery slice 123 and the fourth battery slice 124 are formed by dividing a whole battery slice, and the four battery slices have the same size. Figure 4As shown, each battery slice is distributed with a plurality of first electrodes 401 and the same number of second electrodes 402, and the first electrodes 401 and the second electrodes 402 are arranged alternately. When the first electrode 401 is a positive electrode, the second electrode 402 is a negative electrode, and vice versa, when the first electrode 401 is a negative electrode, the second electrode 402 is a positive electrode, and the polarities of the two are opposite. In the first battery unit 110, the first battery slice 111 and the second battery slice 112 have the same electrode distribution structure, that is, at the same position in a preset direction, the first electrode 401 of the first battery slice 111 corresponds to the first electrode 401 of the second battery slice 112, and the second electrode 402 of the first battery slice 111 corresponds to the second electrode 402 of the second battery slice 112. At the same time, in the second battery cell 120, the third battery slice 123 and the fourth battery slice 124 also have the same electrode distribution structure, that is, at the same position in the preset direction, the first electrode 401 of the third battery slice 123 corresponds to the first electrode 401 of the fourth battery slice 124, and the second electrode 402 of the third battery slice 123 corresponds to the second electrode 402 of the fourth battery slice 124. Further, the electrode distribution of the first battery cell 110 and the second battery cell 120 is different. At the same position in the preset direction, the first electrode 401 of the first battery cell 110 corresponds to the second electrode 402 of the second battery cell 120, and the second electrode 402 of the first battery cell 110 corresponds to the first electrode 401 of the second battery cell 120. From another aspect, it can be described as follows: in the same battery cell, the electrodes of the same sex are arranged one by one; in different battery cells, the electrodes of the opposite sex are arranged one by one.

[0045] like Figure 5 As shown, the electrodes of the same battery slice are distributed in an array form. Taking the first battery slice 111 as an example, the first battery slice 111 is distributed with two rows and multiple columns of electrodes along the preset direction. In the same row, the first electrode 401 and the second electrode 402 are alternately arranged in sequence; the electrodes in the same column are the same. Taking the third battery slice 123 as an example, the third battery slice 123 is distributed with two rows and multiple columns of electrodes along the preset direction. In the same row, the second electrode 402 and the first electrode 401 are alternately arranged in sequence; the electrodes in the same column are the same.

[0046] Figure 6 yes Figure 4 Schematic diagram of the structure of the photovoltaic cell module (with interconnection strips). Figure 6As shown, the corresponding like-pole electrodes of two battery slices in the same battery cell are connected, and in different battery cells, the second electrode 402 of the first battery cell 110 is connected to the first electrode 401 of the second battery cell 120. At the same time, the first electrode 401 of the first battery cell 110 is connected to the bus bar or the first electrode 401 of another photovoltaic cell module, thereby forming a parallel electrical connection of the two battery slices in the same battery cell, and the first battery cell 110 and the second battery cell 120 are formed into a series electrical connection.

[0047] From the above, we can see that Figure 6 The circuit layout of each battery cell is similar to Figure 3 The circuit layout of the half-cell slices shown is similar, except that different cell slices in the same battery unit are electrically connected in parallel. This layout of cell slices overcomes the problems of multi-cut photovoltaic modules in the prior art. For example, in order to maintain a suitable output current and output voltage, it is necessary to redesign the layout according to the number of slices. For example, more confluence designs or even flying wire designs are required, thereby increasing the ineffective area of ​​the photovoltaic module and reducing power. The photovoltaic cell module provided by the exemplary embodiment of the utility model can make the multi-cut technology of the cell slices reduce the series resistance loss, and take into account the simplification of the circuit layout by combining the layout of the half-cell module.

[0048] Furthermore, by dividing the cell into more than two cell segments, not only can the appropriate current and voltage be output, but also the risk of hot spots in the cell and the curvature of the photovoltaic cell welding can be effectively reduced. It should be noted that when the output current of the photovoltaic cell is too large, the electrical safety risk increases sharply, and in severe cases, it may cause the junction box, backplane and other materials to burn, and there is also the problem of large power loss; if the output voltage is too large, the number of photovoltaic modules connected to the system end is reduced, increasing the cost of the power station.

[0049] like Figure 6 As shown, the connection between each electrode is electrically connected in the form of an interconnection bar. The interconnection bar connecting another photovoltaic cell module 100 or a bus bar is defined as a first interconnection bar 501, and the interconnection bar connecting the first battery cell 110 and the second battery cell 120 in the same photovoltaic cell module is defined as a second interconnection bar 502.

[0050] Exemplarily, the first electrodes 401 corresponding to the two battery slices of the first battery unit 110 are connected through the first interconnection bar 501, one end of the first interconnection bar 501 is disconnected from the corresponding first interconnection bar 501 in the second battery unit 120, and the other end is connected to the second electrode 402 in another photovoltaic cell module 100 or connected to the bus bar. Accordingly, the second electrodes 402 corresponding to the two battery slices of the first battery unit 110 are connected through the second interconnection bar 502, and the first electrodes 401 corresponding to the two battery slices in the second battery unit 120 are also connected through the second interconnection bar 502, that is, the second electrodes 402 corresponding to the two battery slices of the first battery unit 110 and the first electrodes 401 corresponding to the two battery slices in the second battery unit 120 share a second interconnection bar 502, and both ends of the second interconnection bar 502 are disconnected from other photovoltaic cell modules 100 or bus bars, thereby forming a series electrical connection between the first battery unit 110 and the second battery unit 120.

[0051] Figure 7 It is a schematic diagram of the structure of a battery string array (1 / 6 piece) according to an embodiment of the utility model; Figure 8 yes Figure 7 Schematic diagram of the structure of the photovoltaic cell module (without interconnection strips). Figure 7 and Figure 8 As shown, the photovoltaic cell module 100 provided by the exemplary embodiment of the utility model includes two battery cells connected in series, and the battery cell includes three battery slices connected in parallel, and a plurality of first electrodes 401 and corresponding second electrodes 402 are distributed on the battery slices, and the first electrodes 401 and the second electrodes 402 are alternately arranged on the corresponding battery slices; in the same battery cell, the first electrodes 401 possessed by different battery slices have the same position in a preset direction, and the second electrodes 402 possessed by different battery slices have the same position in the preset direction; the first electrode 401 possessed by one of the two battery cells has the same position in the preset direction as the second electrode 402 possessed by the other battery cell; the preset direction refers to the distribution direction from the first electrode 401 to the second electrode 402 on the same battery slice.

[0052] like Figure 7 and Figure 8As shown, in the two battery cells connected in series of the photovoltaic cell module 100, the battery cell located at the top is defined as the first battery cell 110, and the battery cell located at the bottom is defined as the second battery cell 120, wherein the three battery slices in the first battery cell 110 are defined as the first battery slice 111, the second battery slice 112 and the sixth battery slice 113 from top to bottom; the three battery slices in the second battery cell 120 are defined as the third battery slice 123, the fourth battery slice 124 and the fifth battery slice 125 from top to bottom. It should be noted that the above-mentioned top and bottom are Figure 7 or Figure 8 The upper and lower position relationship on the paper is only for the convenience of description and does not mean the absolute position of each component.

[0053] In practical applications, the first battery slice 111, the second battery slice 112, the sixth battery slice 113, the third battery slice 123, the fourth battery slice 124 and the fifth battery slice 125 are divided from a whole battery slice, and the six battery slices have the same size. At the same position in a preset direction, the first electrode 401 of the first battery slice 111, the first electrode 401 of the second battery slice 112 and the first electrode 401 of the sixth battery slice 113 correspond to each other, and the second electrode 402 of the first battery slice 111, the second electrode 402 of the second battery slice 112 and the second electrode 402 of the sixth battery slice 113 correspond to each other. At the same time, in the second battery cell 120, the third battery cell 123, the fourth battery cell 124 and the fifth battery cell 125 also have the same electrode distribution structure, that is, at the same position in the preset direction, the first electrode 401 of the third battery cell 123, the first electrode 401 of the fourth battery cell 124 and the first electrode 401 of the fifth battery cell 125 correspond to each other, and the second electrode 402 of the third battery cell 123, the second electrode 402 of the fourth battery cell 124 and the second electrode 402 of the fifth battery cell 125 correspond to each other. Further, the electrode distribution of the first battery cell 110 is different from that of the second battery cell 120. At the same position in the preset direction, the first electrode 401 of the first battery cell 110 corresponds to the second electrode 402 of the second battery cell 120, and accordingly, the second electrode 402 of the first battery cell 110 corresponds to the first electrode 401 of the second battery cell 120. From another perspective, in the same battery cell, electrodes of the same polarity are arranged in a one-to-one correspondence; in different battery cells, electrodes of opposite polarity are arranged in a one-to-one correspondence.

[0054] Fig. 9 yes Figure 7 Schematic diagram of the structure of the photovoltaic cell module (with interconnection strips). Fig. 9As shown, the corresponding like-pole electrodes of the three battery slices in the same battery unit are connected, and in different battery cells, the second electrode 402 of the first battery unit 110 is connected to the first electrode 401 of the second battery unit 120. At the same time, the first electrode 401 of the first battery unit 110 is connected to the bus bar or the second electrode 402 of another photovoltaic cell module 100, thereby forming a parallel electrical connection of the three battery slices in the same battery unit, and the first battery unit 110 and the second battery unit 120 form a series electrical connection.

[0055] Specifically, the first electrodes 401 corresponding to the three battery slices of the first battery unit 110 are connected through the first interconnection bar 501, one end of the first interconnection bar 501 is disconnected from the corresponding first interconnection bar 501 in the second battery unit 120, and the other end is connected to the second electrode 402 in another photovoltaic cell module 100 or connected to the bus bar. Correspondingly, the second electrodes 402 corresponding to the three battery slices of the first battery unit 110 are connected through the second interconnection bar 502, and the first electrodes 401 corresponding to the three battery slices in the second battery unit 120 are also connected through the second interconnection bar 502, that is, the second electrodes 402 corresponding to the three battery slices of the first battery unit 110 and the first electrodes 401 corresponding to the three battery slices in the second battery unit 120 share a second interconnection bar 502, and both ends of the second interconnection bar 502 are disconnected from other photovoltaic cell modules 100 or bus bars, thereby forming a series electrical connection between the first battery unit 110 and the second battery unit 120.

[0056] It should be understood that the technical advantages of the 1 / 6 slicing adopted by the photovoltaic cell module 100 in the prior art are the same as the technical advantages of the 1 / 4 slicing adopted by the photovoltaic cell module 100, which will not be elaborated here.

[0057] From the above implementation of cutting a whole cell into different numbers of cell slices, it can be seen that in the photovoltaic cell module 100, the total number of cell slices in the two battery units is n, and the cell slices are prepared by dividing the whole cell into n pieces, where n is an even number and n≥4.

[0058] like Figure 5 and Figure 8As shown, in some embodiments, in the same battery cell, there is a first gap d1 between two adjacent battery slices, and there is a second gap d2 between the two battery cells. Specifically, there is a first gap d1 between the first battery slice 111 and the second battery slice 112, and between the second battery slice 112 and the sixth battery slice 113; there is also a first gap d1 between the third battery slice 123 and the fourth battery slice 124, and between the fourth battery slice 124 and the fifth battery slice 125, and there is a second gap d2 between the first battery cell 110 and the second battery cell 120.

[0059] In other embodiments, when there is a first negative spacing between each battery slice in the same battery cell, for example, there may be a first negative spacing between the first battery slice 111 and the second battery slice 112, and between the second battery slice 112 and the sixth battery slice 113, that is, there is an overlapping area between two adjacent battery slices. At this time, there may be a second negative spacing between the first battery cell 110 and the second battery cell 120, that is: there is an overlapping area between the second battery slice 112 and the third battery slice 123, or there is an overlapping area between the sixth battery slice 113 and the third battery slice 123. It should be understood that the above-mentioned first negative spacing and the second negative spacing may be the same or different, depending on actual needs. Optionally, there may be a third gap between the first battery cell 110 and the second battery cell 120, that is: the second battery slice 112 and the third battery slice 123 are spaced apart, or the sixth battery slice 113 and the third battery slice 123 are spaced apart. By spacing or overlapping each battery slice and each battery unit, the size of the entire photovoltaic battery module 100 can be adjusted according to actual needs, and the size of the battery assembly can be adjusted to fully utilize the illumination area of ​​the battery assembly.

[0060] The exemplary embodiment of the utility model also provides a photovoltaic cell string, such as Figure 4 and Figure 7 As shown, a plurality of photovoltaic cell modules 100 form a photovoltaic cell module group 200 along a first direction perpendicular to a preset direction, and a plurality of photovoltaic cell module groups 200 are distributed along the preset direction and electrically connected in series to form a photovoltaic cell string 300. For example, as Figure 4 As shown, three photovoltaic cell modules 100 are connected in series to form a photovoltaic cell module group 200, and six photovoltaic cell module groups 200 are connected in series to form a photovoltaic cell string 300. Each photovoltaic cell module 100 has two battery cells, and a photovoltaic cell string 300 has a total of 36 battery cells and 72 battery slices. Figure 7As shown, three photovoltaic cell modules 100 are connected in series to form a photovoltaic cell module group 200, and six photovoltaic cell module groups 200 are connected in series to form a photovoltaic cell string 300. Each photovoltaic cell module 100 has two battery cells, and a photovoltaic cell string 300 has a total of 36 battery cells and 108 battery slices.

[0061] In some embodiments, the photovoltaic cell module group 200 has two opposite ends, and the photovoltaic cell module group 200 also includes two bus bars 600 located at corresponding ends, and each first electrode 401 of the cell segment located at one end is electrically connected to one of the two bus bars 600; each second electrode 402 of the cell segment located at the other end is electrically connected to the other of the two bus bars 600, and the bus bar 600 located at one end of one photovoltaic cell module group 200 of two adjacent photovoltaic cell module groups 200 is electrically connected to the bus bar 600 located at the corresponding end of the other photovoltaic cell module group 200.

[0062] like Figure 4 As shown, the photovoltaic cell module group 200 is in the first direction, that is, Figure 4 There are two opposite ends in the vertical direction of the paper, namely the top and the bottom, wherein each first electrode 401 of the battery slice at the top is connected to the bus bar 600 at the top, and each second electrode 402 of the battery slice at the bottom is connected to the bus bar 600 at the bottom. Figure 4 From left to right in the figure, each photovoltaic cell module group 200 is defined as the first to sixth photovoltaic cell module groups, wherein the bus bar 600 at the top of the first photovoltaic cell module group is electrically connected to the bus bar 600 at the top of the second photovoltaic cell module group, or the two share a bus bar 600; the bus bar 600 at the bottom of the second photovoltaic cell module group is electrically connected to the bus bar 600 at the bottom of the third photovoltaic cell module group, or the two share a bus bar 600, and so on. Each photovoltaic cell module group 200 is electrically connected in series through the bus bar 600 to form a photovoltaic cell string. It should be noted that the bus bar 600 at the top of the first photovoltaic cell module group is connected to the first electrode 401 of the cell slice at the top of the module group, and the bus bar 600 at the top of the second photovoltaic cell module group is connected to the second electrode 402 of the cell slice at the top of the module group; the bus bar 600 at the bottom of the second photovoltaic cell module group is connected to the first electrode 401 of the cell slice at the bottom of the module group, and the bus bar 600 at the bottom of the third photovoltaic cell module group is connected to the second electrode 402 of the cell slice at the bottom of the module group, and the connection polarity of the bus bars 600 of other cell module groups is similar, which will not be described here. Based on this, through conventional circuit layout methods, even if more slices are used, for example, a whole cell is cut into 6 cell slices, such as Figure 7As shown, there is no need to redesign the circuit connection, which simplifies the circuit and eliminates the need for more confluence designs and flying wire designs, thereby increasing the effective area of ​​the photovoltaic cell assembly and increasing the power generation capacity.

[0063] An exemplary embodiment of the present utility model further provides a battery string array, comprising a plurality of photovoltaic battery strings 300 connected in parallel, wherein at least one photovoltaic battery string 300 is a photovoltaic battery string 300 of any of the above-mentioned embodiments.

[0064] like Figure 4 and Figure 7 As shown, the battery string array has two photovoltaic cell strings 300 distributed along a direction perpendicular to a preset direction, and the two photovoltaic cell strings 300 are arranged in mirror symmetry along a bus bar 600 located in the middle of the two, and the two photovoltaic cell strings 300 share the bus bar 600 located in the middle of the two to form a parallel electrical connection, thereby avoiding the problem of complex battery layout.

[0065] An exemplary embodiment of the present utility model further provides a photovoltaic cell assembly, comprising the above-mentioned cell string array.

[0066] Fig.10 Schematic diagram of the exploded structure of a photovoltaic cell assembly according to an embodiment of the present utility model. Fig.10 As shown, the photovoltaic cell assembly of the exemplary embodiment of the utility model includes a cell string array 701, a packaging film 702 located on both sides of the cell string array 701, a front plate glass 704 and a back plate 703, wherein the back plate 703 can be a photovoltaic back plate or photovoltaic glass, and the front plate glass 704 is photovoltaic glass. The packaging film can be a polyethylene-polyvinyl acetate copolymer (Polyethylenevinylacetate, EVA) film, or a polyolefin elastomer (Poly (ethylene-1-octene), POE) film, EVA / POE laminated film, EVA / POE / EVA laminated film or POE / EVA / POE laminated film.

[0067] Compared with the prior art, the advantages of the photovoltaic cell assembly of the exemplary embodiment of the present utility model are the same as those of the photovoltaic cell module described above, which will not be described in detail here.

[0068] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A photovoltaic cell module, characterized in that: The invention comprises two battery cells connected in series, wherein the battery cells comprise a plurality of battery slices connected in parallel, a plurality of first electrodes and corresponding second electrodes are distributed on the battery slices, and the first electrodes and the second electrodes are alternately arranged on the corresponding battery slices; In the same battery unit, the first electrodes of different battery slices have the same position in the preset direction, and the second electrodes of different battery slices have the same position in the preset direction; The first electrode of one of the two battery cells is located at the same position in the preset direction as the second electrode of the other battery cell; The preset direction refers to the distribution direction from the first electrode to the second electrode on the same battery slice.

2. The battery module according to claim 1, characterized in that: The number of battery slices in the two battery units is n, and the battery slices are prepared by dividing a whole battery sheet into n pieces, where n is an even number and n≥4.

3. The battery module according to claim 1, characterized in that: In the same battery unit, at the same position in the preset direction, the first electrodes of different battery slices are electrically connected, and the second electrodes of different battery slices are electrically connected.

4. The battery module according to claim 3, characterized in that: At the same position in the preset direction, of the two battery cells, the first electrode of one battery cell is electrically connected to the second electrode of the other battery cell, and the second electrode is disconnected from the first electrode of the other battery cell.

5. The battery module according to any one of claims 1 to 4, characterized in that: In the same battery unit, there is a first gap between two adjacent battery slices, and there is a second gap between two battery units.

6. The battery module according to any one of claims 1 to 4, characterized in that: In the same battery unit, there is a first negative spacing between two adjacent battery slices, and there is a second negative spacing or a third gap between two battery units.

7. A photovoltaic cell string, characterized in that: It comprises a plurality of photovoltaic cell module groups connected in series, wherein the plurality of photovoltaic cell module groups are distributed along a preset direction; The photovoltaic cell module group comprises at least one photovoltaic cell module, and the photovoltaic cell module is the cell module according to any one of claims 1 to 6; When the photovoltaic cell module group includes a plurality of photovoltaic cell modules, each of the photovoltaic cell modules is connected in series.

8. The photovoltaic cell string according to claim 7, characterized in that: The photovoltaic cell module group has two opposite ends, and the photovoltaic cell module group further includes two bus bars located at the corresponding ends, and each of the first electrodes of the cell segments located at one end is electrically connected to one of the two bus bars; Each of the second electrodes of the battery slice located at the other end is electrically connected to the other of the two bus bars; A bus bar at one end of one of the two adjacent photovoltaic cell module groups is electrically connected to a bus bar at a corresponding end of the other photovoltaic cell module group.

9. A battery string array, characterized in that: The invention comprises a plurality of photovoltaic cell strings connected in parallel, at least one of the photovoltaic cell strings is the photovoltaic cell string according to claim 7 or 8.

10. A photovoltaic cell assembly, characterized in that: Comprising the battery string array as claimed in claim 9.

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