CN218215328U - Photovoltaic module and photovoltaic system - Google Patents

Abstract

The utility model is suitable for a photovoltaic technology field provides a photovoltaic module and photovoltaic system, photovoltaic module's battery piece array includes along vertical direction arrange and concatenate a plurality of battery string units together in proper order, the first battery string group of battery string unit includes that two set up and concatenate first battery string together along vertical direction interval, second battery string group just concatenates two at least second battery strings together including being located between two adjacent first battery strings in proper order, first battery string and second battery string all include along horizontal direction arrange and concatenate a plurality of half batteries together. Therefore, even if the photovoltaic module forms the dust deposition belt at the lower part in the using process, the existence of the dust deposition belt only influences the power generation of the first battery string group at the lowest part in the longitudinal direction, and does not influence each battery string unit at the upper part, thereby improving the power generation efficiency of the photovoltaic module.

Description

Photovoltaic module and photovoltaic system

Technical Field

The utility model relates to a photovoltaic technology field especially relates to a photovoltaic module and photovoltaic system.

Background

In the technical field of solar cells, the cell slice half-cutting technology is a novel mode for improving the energy efficiency of a photovoltaic module, which is made up in recent years, the traditional cell slice is divided into two parts, and then series welding is carried out, so that the internal resistance loss of the cell slice can be reduced, the influence of local shadow shielding on the power generation efficiency of the whole cell module can be reduced, and the solar cell half-cutting technology is a technology used by the current mainstream photovoltaic module.

In the cell slice halving technology, a cell slice is generally averagely cut into two halves, the open-circuit voltage of each half is unchanged, the current is changed into 1/2 of the original current, the internal loss of the half cell slice is reduced to 1/4 of the original loss according to the Joule law, the overall output power and efficiency of the assembly are improved, the working voltage of the whole assembly is kept consistent with that before halving, and the serial structure is optimized. However, with such a setting mode, after the photovoltaic module is installed, due to long-term dust deposition, a dust deposition zone is formed below the module and shields the lowest row of cells, and because the setting mode in the prior art is a mode that an upper part and a lower part are divided and the cell strings are longitudinally connected in series, in the existing technical scheme of the photovoltaic module adopting the half cells, the shielding of the dust deposition zone at the lower part of the module can greatly influence the power output of all the cell strings of the lower half division, the influence range reaches 1/2 of that of the whole half cell piece assembly, and the power generation efficiency of the photovoltaic module is greatly reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a photovoltaic module and photovoltaic system aims at solving among the prior art photovoltaic module and leads to the lower technical problem of photovoltaic module's generating efficiency because the existence in deposition area.

The utility model is so realized, the embodiment of the utility model provides an in photovoltaic module include:

the battery piece array comprises a plurality of battery string units which are arranged along the longitudinal direction and are sequentially connected in series, each battery string unit comprises a first battery string group and a second battery string group which is connected with the first battery string group in parallel, each first battery string group comprises two first battery strings which are arranged along the longitudinal direction at intervals and are connected in series, each second battery string group comprises at least two second battery strings which are positioned between every two adjacent first battery strings and are sequentially connected in series, and each first battery string and each second battery string comprises a plurality of half batteries which are arranged along the transverse direction and are connected in series; and

the bypass diodes are arranged on one side of the battery piece array along the transverse direction, each battery string unit corresponds to at least one bypass diode, and the bypass diodes are connected with the first battery string group and the second battery string group in parallel.

Further, each of the first battery string groups and each of the second battery string groups are connected in parallel with the same bypass diode.

Still further, the photovoltaic module includes and sets up along the transverse direction the first busbar of cell piece array one side, first busbar extends along longitudinal direction, first battery string group with the positive terminal and the negative pole end of second battery string group all with first busbar is connected, the positive terminal and the negative pole end of second battery string group are located between the positive terminal and the negative pole end of first battery string group and with first busbar is connected, bypass diode sets up on the first busbar and connect between the positive terminal and the negative pole end of second battery string.

Still further, the photovoltaic module further includes a second bus bar and a third bus bar located on the opposite side of the cell array from the bypass diode, the second bus bar connecting two of the first cell strings together at one end in series to form the first cell string set, and the third bus bar connecting two of the second cell strings together in series to form the second cell string set.

Furthermore, the second battery string group is formed by connecting two strings of the second battery strings in series, the two strings of the second battery strings are arranged between the two strings of the first battery strings, and the number of half batteries of the first battery strings is the same as that of half batteries of the second battery strings.

Further, the first battery string and the second battery string are formed by connecting 10-12 half batteries in series.

Furthermore, the number of the battery string units is at least 3, at least 3 of the battery string units are arranged along the longitudinal direction, the number of the bypass diodes is also at least 3, and each battery string unit corresponds to at least one bypass diode.

The utility model also provides a photovoltaic system, photovoltaic system includes a plurality of foretell photovoltaic module.

Furthermore, the photovoltaic modules are arranged in an array mode, and in the front-back direction of the arrangement of the photovoltaic modules, the orthographic projection of the photovoltaic module at the front one on the plane where the cell array of the photovoltaic module at the back one is located shields the first cell string of the cell string unit at the lowest position of the photovoltaic module at the back one in the longitudinal direction.

Furthermore, as the illumination time changes, in the front-back direction of the array arrangement of the photovoltaic modules, the shadow area formed by the front photovoltaic module and the back photovoltaic module is smaller than or equal to half of the area of the back photovoltaic module.

The utility model discloses the beneficial effect who reaches is: on the one hand, through setting the battery string unit of cell array to the mode of vertically arranging and half the battery of first battery cluster and second battery string all adopts the mode of transversely arranging, compare in prior art the battery string in two upper and lower half districts of photovoltaic module and constitute by a plurality of half batteries of vertically arranging, even photovoltaic module can form the deposition area in the lower part in the use, the electricity generation of a first battery string group of longitudinal direction below also can only be influenced in the existence in deposition area, and can not influence each battery string unit of top, thereby improve photovoltaic module's generating efficiency and lead to photovoltaic module's generating efficiency greatly reduced's technical problem in order to solve among the prior art because the existence in deposition area.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic block diagram of a photovoltaic system provided by the present invention;

fig. 2 is a schematic structural diagram of a photovoltaic system provided by the present invention;

fig. 3 is a schematic structural diagram of a photovoltaic module provided by the present invention;

FIG. 4 is an equivalent circuit schematic of the photovoltaic module of FIG. 3;

FIG. 5 is a schematic structural view of a photovoltaic module according to the prior art;

fig. 6 is an equivalent circuit schematic of the photovoltaic module of the prior art of fig. 5.

Description of the main element symbols:

the photovoltaic system 1000, the photovoltaic module 100, the cell array 10, the cell string unit 11, the first cell string group 111, the first cell string 1111, the second cell string group 112, the second cell string 1121, the half cell 113, the bypass diode 20, the first bus bar 30, the second bus bar 40, and the third bus bar 50.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention. Furthermore, it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "first direction", "second direction", "longitudinal", "transverse", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Moreover, the present disclosure may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

In the related art, the existing half-cut cell generally adopts an upper part and a lower part which are respectively connected in series, the partitions are connected in parallel, a bypass diode is arranged in the middle of the whole photovoltaic module, and a cell slice is connected in series with an equivalent circuit. However, by adopting the arrangement mode, after the photovoltaic module is installed, due to long-term dust accumulation, a dust accumulation belt can be formed below the module and can shield the lowermost row of cells, and the arrangement mode in the prior art adopts a mode that the upper part and the lower part are partitioned and the cell strings are longitudinally connected in series, so that in the technical scheme of the photovoltaic module adopting the half cells, the shielding of the dust accumulation belt at the lower part of the module can greatly influence the power output of all the cell strings of the lower half partition, the influence range reaches the whole half cell module cutting mode, and the power generation efficiency of the photovoltaic module is greatly reduced.

The embodiment of the utility model provides an in, through the half cell 113 that sets the battery cluster unit 11 of cell array 10 to the mode of vertically arranging and first battery cluster 1111 and second battery cluster 1121 all adopt the mode of transversely arranging, compare in prior art the battery cluster in two upper and lower half districts of photovoltaic module and constitute by a plurality of half cells of vertically arranging, even photovoltaic module 100 can form the deposition area in the lower part in the use, the existence in deposition area also can only influence the electricity generation of a vertical direction the first battery cluster group 111 of below, and can not influence each battery cluster unit 11 of top, thereby improve photovoltaic module 100's generating efficiency and in order to solve the technical problem that leads to photovoltaic module's generating efficiency greatly reduced because of the existence in the deposition area among the prior art.

Example one

Please refer to fig. 1 and fig. 2, the embodiment of the present invention provides a photovoltaic system 1000 which comprises a plurality of photovoltaic modules 100, wherein the photovoltaic modules 1000 in the photovoltaic system 1000 are arranged in an array to form a photovoltaic array, for example, the photovoltaic system 1000 can be applied to a photovoltaic power station, such as a ground power station, a roof power station, a water power station, etc., and also applied to a device or an apparatus which utilizes solar energy to generate electricity, such as a user solar power source, a solar street lamp, a solar automobile, a solar building, etc. Of course, it is understood that the application scenario of the photovoltaic system 1000 is not limited thereto, that is, the photovoltaic system 1000 may be applied in all fields requiring solar energy for power generation. Taking a photovoltaic power generation system network as an example, the photovoltaic system 1000 may include a photovoltaic array, a combiner box and an inverter, the photovoltaic array may be an array combination of a plurality of photovoltaic modules 100, for example, the plurality of photovoltaic modules 100 may form a plurality of photovoltaic arrays, the photovoltaic array is connected to the combiner box, the combiner box may combine currents generated by the photovoltaic arrays, and the combined currents are converted into alternating currents required by a utility grid through the inverter and then are connected to the utility grid to realize solar power supply.

Referring to fig. 3 and 4, a photovoltaic module 100 according to an embodiment of the present invention may include a cell array 10 and a plurality of bypass diodes 20.

The battery sheet array 10 includes a plurality of battery string units 11 arranged along a longitudinal direction and serially connected together, where the battery string units 11 may include a first battery string group 111 and a second battery string group 112 connected in parallel with the first battery string group 111, the first battery string group 111 includes two first battery strings 1111 arranged at intervals along the longitudinal direction and serially connected together, the second battery string group 112 includes at least two second battery strings 1121 arranged between two adjacent first battery strings 1111 and serially connected together in sequence, and each of the first battery strings 1111 and the second battery strings 1121 includes a plurality of half-sheets of batteries 113 arranged along a transverse direction and serially connected together.

The plurality of bypass diodes 20 are disposed at one side of the cell array 10 in the transverse direction, the plurality of bypass diodes 20 may be disposed at intervals in the longitudinal direction, each of the cell string units 11 corresponds to at least one bypass diode 20, and the bypass diodes 20 are connected in parallel to the first cell string group 111 and the second cell string group 112.

In the photovoltaic module 100 and the photovoltaic system 1000 according to the embodiment of the present invention, the cell array 10 of the photovoltaic module 100 includes a plurality of cell string units 11 arranged along the longitudinal direction, each cell string unit 11 includes a first cell string group 111 and a second cell string group 112 connected in parallel with the first cell string group 111, the first cell string group 111 includes two first cell strings 1111 arranged at intervals along the longitudinal direction and connected in series together, the second cell string group 112 includes at least two second cell strings 1121 arranged between two adjacent first cell strings 1111 and connected in series in sequence, and each of the first cell strings 1111 and the second cell strings 1121 includes a plurality of half cells 113 arranged along the transverse direction and connected in series together. The bypass diode 20 is disposed at a plurality of bypass diodes 20 at one side of the cell array 10 in a lateral direction, at least one bypass diode 20 corresponds to each cell string unit 11, and the bypass diode 20 is connected in parallel to the first cell string group 111 and the second cell string group 112. As such, on one hand, the cell string units 11 are arranged in a longitudinal arrangement manner, and the half cells 113 of the first cell string 1111 and the second cell string 1121 are all arranged in a transverse manner, compared with the prior art in which the cell strings of the photovoltaic module are respectively formed by two upper and lower half regions and the half regions are formed by a plurality of half cells arranged in a longitudinal manner, even if the photovoltaic module 100 forms a dust zone at the lower part during use, the presence of the dust zone only affects the power generation of the first cell string group 111 at the lowest part in the longitudinal direction, and does not affect each cell string array at the upper part, so as to improve the power generation efficiency of the photovoltaic module 100, on the other hand, each cell in the cell array 10 is formed by connecting half cells 113 in parallel, so that the internal resistance loss of the photovoltaic module 100 can be reduced, so as to improve the output voltage, and meanwhile, the second cell string group 112 is connected in parallel with the first cell string group 111, and the second cell string group 112 is formed by connecting at least two second cell strings 1121 between two first cell strings 111 (i.e., the second cell string group 112 is nested in the first cell string group 111), so that the whole photovoltaic module 100 can maintain the same voltage as the conventional voltage of the photovoltaic module 100. That is to say, the photovoltaic module 100 provided in the embodiment of the present invention provides a completely new arrangement and series-parallel connection manner of the cell array 10, so that the photovoltaic module 100 can reduce the influence caused by the dust deposition zone under the condition that the voltage is ensured to be consistent with the conventional module.

Specifically, it is understood that, in this document, the "half cell 113" may be understood as a conventional solar cell that is divided into two symmetrical half cells by a half-cutting technique after the preparation is completed, that is, a half-cutting technique (half-cutting technique) in the solar cell technology field, and the half cell is cut into two halves on average by using the half-cutting technique, the overall operating voltage of the two half cells 113 is consistent with that before the half-cutting, and the current of the half cell 113 after the half-cutting becomes half of the original current.

In the embodiment of the present invention, the half-cell 113 may be a PERC solar cell, an IBC solar cell or a Topcon solar cell, and is not limited to the type of the solar cell. It is understood that in such embodiments, the photovoltaic module 100 may further include a metal frame, a backsheet, a photovoltaic glass, and an adhesive film (not shown). The battery piece array 10 may be disposed between the back plate and the photovoltaic glass, and the adhesive film may be filled between the front surface and the back surface of the battery piece array 10 and the photovoltaic glass, and as the filler, the adhesive film may be a transparent colloid with good light transmittance and aging resistance, for example, the adhesive film may be an EVA adhesive film or a POE adhesive film, which may be specifically selected according to actual situations, and is not limited herein.

The photovoltaic glass may be an ultra-white glass having high light transmittance, high transparency, and excellent physical, mechanical, and optical properties, for example, the ultra-white glass may have a light transmittance of more than 92%, which may protect the cell array 10 without affecting the efficiency of the cell array 10 as much as possible. Meanwhile, the photovoltaic glass and the cell array 10 can be bonded together by the adhesive film, and the cell array 10 can be sealed, insulated, waterproof and moistureproof by the adhesive film.

The back plate can be attached to the adhesive film on the back of the battery piece array 10, the back plate can protect and support the battery piece array 10, and has reliable insulation, water resistance and aging resistance, the back plate can be selected from multiple materials, can be generally toughened glass, organic glass, an aluminum alloy TPT composite adhesive film and the like, and can be specifically arranged according to specific conditions without limitation. The whole of the back sheet, the cell array 10, the adhesive film and the photovoltaic glass can be disposed on a metal frame, which serves as a main external support structure of the whole photovoltaic module 100, and can be used for stably supporting and mounting the photovoltaic module 100, for example, the cell assembly 200 can be mounted at a position where it is required to be mounted through the metal frame.

Further, referring to fig. 2, in some embodiments, a plurality of photovoltaic modules 100 in the photovoltaic system 1000 may be arranged in an array, and in a front-back direction of the array arrangement of the photovoltaic modules 100, an orthographic projection of a front photovoltaic module 100 on a plane where the cell array 10 of a rear photovoltaic module 100 is located blocks the first cell string 1111 of the lowermost cell string unit 11 in the longitudinal direction of the rear photovoltaic module 100.

Therefore, by reasonably arranging the array formed by the photovoltaic modules 100, more photovoltaic modules 100 can be installed in an effective space, and meanwhile, the phenomenon that the photovoltaic modules 100 in the front row greatly shield the photovoltaic modules 100 in the rear row to greatly influence the power generation efficiency can be avoided.

Referring to fig. 5 and fig. 6, fig. 5 is a schematic structural diagram of a photovoltaic module 200 in the prior art, and fig. 6 is a schematic equivalent circuit diagram of the photovoltaic module 200 in the prior art, in order to reduce the internal resistance loss of the entire photovoltaic module 200, a half-cutting technique may be generally adopted to cut a cell into two halves for serial connection, the open-circuit voltage of each half remains unchanged, the current becomes half of the original current, the internal resistance is also correspondingly reduced, and in order to achieve the working voltage of the entire photovoltaic module 200 to be consistent with the working voltage before half-cutting, the serial-parallel connection structure of the cell strings may be generally optimized.

As shown in fig. 5 and 6, in the related art, in order to ensure that the voltage of the entire photovoltaic module 200 is kept consistent with the voltage before half-cutting after half-cutting technology is adopted, the entire cell array of the photovoltaic module 200 is generally divided into two upper and lower half-areas along the longitudinal direction, a plurality of cell strings 201 are formed in each half-area along the transverse direction, each cell string 201 includes a plurality of half-cells, the half-cells in the cell strings 201 are arranged along the longitudinal direction, a cell string group is formed between two adjacent cell strings 201 in series, the cell string group in each half-area is connected in series along the transverse direction, the cell string group in the lower half-area is connected in parallel with the cell string group in the upper half-area, bypass diodes 202 are disposed between the upper and lower half-areas, the two upper and lower corresponding cell string groups are connected in parallel with a bypass diode 202, as shown in fig. 5 and 6, in the upper and lower half-areas, the two adjacent cell strings in the upper half-area can be connected in parallel with each other to form 3 cell strings, and the two adjacent cell strings in parallel with the middle cell string group 201 in the lower half-area, and the bypass diode 202.

However, although the arrangement shown in fig. 5 and 6 can achieve the same overall open-circuit voltage of the photovoltaic module 100 and the open-circuit voltage before half-cutting by optimizing the series-parallel connection structure between the cell strings, and the internal resistance loss is correspondingly reduced, referring to fig. 5, the photovoltaic module 100 is generally installed in the longitudinal direction when being installed, that is, the upper half area is located above and the lower half area is located below. In such a solution, on one hand, as shown in fig. 5, after the photovoltaic module 100 is installed, due to long-term dust deposition, a dust deposition zone (as shown in fig. 5) may be formed below the photovoltaic module 200, and the dust deposition zone may shield a row of cells in the lowermost transverse direction, and especially in a roofing project with a low installation inclination angle, such a dust deposition zone is easy to form, as can be seen from fig. 5 and 6, since the cells in the cell string of the lower half zone are all connected in series in the longitudinal direction, and the cell string groups are connected in series in the transverse direction, the presence of the dust deposition zone may shield a part of the cells on all the cell string groups of the lower half zone, and thus, the presence of the dust deposition zone may greatly affect the power output of all the cell string groups of the lower half zone, and its influence range reaches half of the entire photovoltaic module 200, thereby greatly reducing the power generation efficiency of the entire photovoltaic module 200.

On the other hand, as shown in fig. 2, in the photovoltaic system 1000, when a photovoltaic array composed of photovoltaic modules 100 is installed, there is a component which can partially shield the former one, and in different seasons, due to the change of the solar altitude, the rear row can be shielded by the front row, and the shielding extends upwards from the lower side of the photovoltaic module 100. As shown in fig. 5 and 6, the shadow masking effect of the conventional photovoltaic module 200 using the half-cut technology is started from the beginning of blocking the row of half cells in the lowest transverse direction, and the existence of the shadow affects 1/2 of the output power of the whole module before the shadow crosses the middle line, and continues until the front row masks the rear row by the middle line position of the rear row module, so that the shadow affects the output power of the whole photovoltaic module 200. Specifically, according to the conventional design principle, the time period from 9 am to 15 pm of the winter solstice is kept, the front row does not shield the rear row, and about 15% of the total solar radiation is wasted outside the time period, but according to the conventional series connection mode of half cells, no matter how much the shadow shields, the whole lower half area of the photovoltaic module 200 is continuously influenced at least, and the 15% of the effective illumination is less than 1/4, that is, only about 3.75% of the illumination is used.

However, as shown in fig. 3, in the photovoltaic module 100 according to the embodiment of the present invention, each cell string unit 11 in the cell array 10 is arranged along the longitudinal direction, the first cell string 1111 in the first cell string set 111 and the second cell string 1121 in the second cell string set 112 are both composed of half cells 113 arranged along the transverse direction, that is, in the present invention, the half cells 113 are serially connected along the transverse direction to form the first cell string 1111 and the second cell string 1121, and the second cell string set 112 is located between the two first cell strings 1111 of the first cell string set 111 and connected in parallel with the first cell string set 111, that is, the second cell string set 112 is nested in the first cell string set 111, and the bypass diode 20 can be disposed at one side of the cell array 10 along the transverse direction. Thus, on one hand, as shown in fig. 3 and 4, after the photovoltaic module 100 is installed along the longitudinal direction, even if the dust belt is formed at the bottom of the photovoltaic module 100, the dust belt only affects one row of cells in the lowermost transverse direction, that is, only affects the first cell string group 111 in the lowermost one cell string unit 11, and does not affect the normal power generation of the other cell string groups, for example, as shown in fig. 3 and 4, the number of the cell string units 11 is 3, and the number of the first cell string group 111 and the number of the second cell string group 112 are respectively 3, when the dust belt blocks the lowermost row of cells, the dust belt only affects the power generation efficiency of the lowermost first cell string group 111, and the influence range is 1/6, compared with the technical solution of the related art that affects 1/2 shown in fig. 5, the influence range is greatly reduced, and the power generation efficiency of the photovoltaic module 100 is greatly improved. On the other hand, in the present invention, although the back row is shielded by the front row square matrix due to the change of the solar altitude angle, after the technical solution of the present invention is adopted, the shadow shielding just starts to affect only the lowermost one of the battery string sets, which only affects 1/6 of the whole assembly, and as time goes on, the range of the effect is only gradually changed from 1/6 to 1/3, 1/2, 2/3, 5/6 until the whole photovoltaic assembly 100 is affected, obviously, compared with the prior art in which the range of the effect from the beginning is just 1/2, and then to the whole photovoltaic assembly 100, such a setting mode obviously has higher power generation efficiency. Specifically, with keeping the winter solstice morning 9 to afternoon 15 time quantum, the front-seat does not shelter from the calculation to the back row, outside this time quantum, still has whole day sunshine irradiated about 15% extravagant, and according to the utility model discloses a mode of concatenating of battery in the embodiment is because the shade shelters from linearly, consequently, the utility model discloses a photovoltaic module 100 utilizes more than 1/2 of 15% whole day sunshine irradiation in this weak light time quantum comprehensively, has also utilized 7.5% exactly, compares the current mode of concatenating of cutting half battery piece, has improved one time utilization ratio, makes the generated energy of whole power station increase substantially.

Further, in some embodiments, as the illumination time varies, the area of the shadow formed on the previous photovoltaic module 100 and the area of the shadow formed on the next photovoltaic module 100 in the front-back direction of the array of photovoltaic modules 200 are less than or equal to half of the area of the next photovoltaic module 100.

Therefore, by reasonably arranging the photovoltaic modules 100, the problem that the utilization rate of sunlight is low due to the fact that the whole photovoltaic module 100 cannot generate electricity within a period of time and the whole photovoltaic module 100 cannot generate electricity due to the fact that the upper shadow area of the front photovoltaic module 100 on the rear photovoltaic module 100 is too large due to the change of the solar altitude angle can be effectively avoided.

Specifically, in such an embodiment, by setting the distance between the front and rear photovoltaic modules 100 and the installation inclination angle of the photovoltaic modules 100, the shadow area formed by the front photovoltaic module 100 on the rear photovoltaic module 100 can be made not to exceed half of the whole area of the photovoltaic module 100 regardless of the change of the illumination angle.

Example two

Referring to fig. 3 and 4, in some embodiments, each first battery string group 111 and each second battery string group 112 are connected in parallel with the same bypass diode 20.

In this way, the first cell string group 111 and the second cell string group 112 in the cell string unit 11 share the bypass diode 20, which can effectively reduce the cost, so that the photovoltaic module 100 can reduce the influence of the dust deposition zone and the shadow shielding as much as possible without increasing the bypass diode 20 to improve the power generation efficiency.

Specifically, as shown in fig. 5 and fig. 6, in the related art, the bypass diode 202 is disposed at the middle position of the upper and lower half areas, and the upper and lower two corresponding parallel battery strings share one bypass diode 202, and in the embodiment of the present invention, the bypass diode 20 can be disposed at one side of the battery array 10 by changing the arrangement direction of the half batteries 113 in each battery array 10 and the serial and parallel connection modes of the battery strings, and the technical problems of low power generation efficiency caused by the shielding of the dust deposition zone and low sunlight utilization ratio caused by the shielding of the shadow can be effectively solved without increasing the number of diodes.

Of course, it is understood that, in order to ensure the performance of the photovoltaic module 100 while neglecting the cost, in other embodiments, one first cell string group 111 corresponds to one bypass diode 20, and one second cell string group 112 corresponds to one bypass diode 20, which is not limited herein.

Further, as shown in fig. 3 and 4, in some embodiments, the number of the battery string units 11 may be at least 3, at least 3 battery string units 11 are arranged along the longitudinal direction, the number of the bypass diodes 20 may also be at least 3, and each battery string unit 11 corresponds to at least one bypass diode 20.

Therefore, the inconvenience in installation caused by the overlarge overall size of the whole photovoltaic module 100 can be avoided, and the small power generation amount caused by the overlarge overall size of the whole photovoltaic module 100 can also be avoided.

Specifically, in such an embodiment, the number of the battery string units 11 may preferably be 3, and of course, in other embodiments, the number of the battery string units 11 may also be greater than 3, which is not limited herein.

EXAMPLE III

Referring to fig. 3 and 4, in some embodiments, the photovoltaic module 100 may further include a first bus bar 30 disposed on one side of the cell array 10 in the transverse direction, the first bus bar 30 extends in the longitudinal direction, positive and negative ends of the first cell string group 111 and the second cell string group 112 are connected to the first bus bar 30, the positive and negative ends of the second cell string group 112 are located between the positive and negative ends of the first cell string group 111 and connected to the first bus bar 30, and the bypass diode 20 is disposed on the first bus bar 30 and connected between the positive and negative ends of the second cell string 1121.

In this way, the first bus bar 30 is only required to be arranged on one side of the cell array 10 in the transverse direction, the bypass diode 20 is arranged on the first bus bar 30, and then the first cell string group 111 and the second cell string group 112 are connected in parallel on the first bus bar 30, so that the parallel connection between the first cell string group 111 and the second cell string group 112 and the bypass diode 20 can be realized, meanwhile, the serial connection of the plurality of cell string units 11 and the parallel connection between the first cell string group 111 and the second cell string group 112 in the cell string units 11 can be realized only by arranging the first bus bar 30 on one side of the cell array 10, and the bus bar does not need to be arranged in a narrow position in the middle of the photovoltaic module 100, so that the realization mode is simpler, and the difficulty is lower.

Specifically, it is understood that, in such an embodiment, the half cells 113 inside two first cell strings 1111 of the first cell string set 111 are connected in series in an opposite manner, wherein the half cells 113 inside one first cell string 1111 may be connected in an arrangement manner of positive electrode-negative electrode-positive electrode-negative electrode, in a transverse direction, and the half cells 113 inside the other first cell string 1111 may be connected in an arrangement manner of negative electrode-positive electrode-negative electrode-positive electrode, in a transverse direction, such that the tails of the two half cells 113 may be directly connected in series to form the complete first cell string set 111, and similarly, the connection manner of the half cells 113 inside two adjacent second cell strings 1121 inside the second cell string set 112 is also opposite, which will not be described herein in detail.

Example four

Referring to fig. 3 and 4, in some embodiments, the photovoltaic module 100 may further include a second bus bar 40 and a third bus bar 50 located on a side of the cell array 10 opposite to the bypass diode 20, where the second bus bar 40 connects two first cell strings 1111 together at one end in series to form a first cell string group 111, and the third bus bar 50 connects two adjacent second cell strings 1121 together in series to form a second cell string group 112.

In this manner, the first cell string group 111 and the second cell string group 112 can be formed only by providing the second bus bar 40 and the third bus bar 50 on one side in the lateral direction of the cell array 10.

Specifically, as shown in the figure, taking the example that the second battery string set 112 includes two second battery strings 1121 as an example, in such an embodiment, the third bus bar 50 connects the ends of the two second battery strings 1121, the second bus bar 40 connects the ends of the two adjacent first battery strings 1111, and the third bus bar 50 is nested in the second bus bar 40.

EXAMPLE five

Referring to fig. 3 and 4, in some embodiments, the second battery string set 112 may be formed by two strings of second battery strings 1121 connected in series, the two strings of second battery strings 1121 are disposed between the two strings of first battery strings 1111, and the number of half-cells 113 in the first battery strings 1111 is the same as that of the second battery strings 1121.

In this way, each of the first battery string group 111 and the second battery string group 112 is composed of two identical battery strings, and the number of half batteries 113 in each battery string group is the same, so that the voltages of the first battery string group 111 and the second battery string group 112 can be the same, thereby ensuring that the overall voltage of the battery string unit 11 is the same as the voltages of the first battery string 1111 and the second battery string 1121.

Specifically, in the example shown in fig. 3 and fig. 4, two second battery strings 1121 are disposed between two adjacent first battery strings 1111, the two first battery strings 1111 are connected in series to form a first battery string group 111, the two second battery strings 1121 are connected in series to form a second battery string group 112, and the number of half batteries 113 in the two battery string groups is the same. Of course, it is understood that in other embodiments, the number of the second battery strings 1121 in the second battery string group 112 may also be greater than two, for example, in some examples, the number of the second battery strings 1121 in the second battery string group 112 may be 3 or more than 3, and a plurality of second battery strings 1121 may be sequentially connected in series to form the second battery string group 112. In addition, it can also be understood that, in some embodiments, the number of the second battery string groups 112 in the battery string unit 11 may also be multiple, for example, there may be four second battery strings 1121 between two first battery strings 1111, and the four second battery strings 1121 are connected in series two by two to form two second battery string groups 112, and it can be understood that, in such a case, each second battery string group 112 may be connected in parallel with one bypass diode 20, and the specific arrangement manner may be set according to practical situations, and is not limited herein.

Further, referring to fig. 3, in some embodiments, the first battery string 1111 and the second battery string 1121 are formed by connecting 10 to 12 half batteries 113 in series.

Thus, setting the number of the half cells 113 in the first cell string 1111 and the second cell string 1121 within a range of 10-12 can ensure that the voltage generated by each cell string group can reach a desired value, so as to avoid that the voltage cannot reach the standard due to too small number of the half cells 113, and also avoid that the voltage exceeds the standard due to too large number of the half cells 113 and the overall volume of the photovoltaic module 100 is too large.

In the description herein, references to the description of terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "other embodiments" or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims (10)

1. A photovoltaic module, comprising:

the battery pack comprises a battery piece array, the battery piece array comprises a plurality of battery string units which are arranged along the longitudinal direction and are sequentially connected in series, each battery string unit comprises a first battery string group and a second battery string group which is connected with the first battery string group in parallel, each first battery string group comprises two first battery strings which are arranged at intervals along the longitudinal direction and are connected in series, each second battery string group comprises at least two second battery strings which are positioned between every two adjacent first battery strings and are sequentially connected in series, and each first battery string and each second battery string comprises a plurality of half batteries which are arranged along the transverse direction and are connected in series; and

the bypass diodes are arranged on one side of the battery piece array along the transverse direction, each battery string unit corresponds to at least one bypass diode, and the bypass diodes are connected with the first battery string group and the second battery string group in parallel.

2. The photovoltaic module of claim 1, wherein each of the first cell string and each of the second cell string is connected in parallel with the same bypass diode.

3. The assembly according to claim 1, wherein the assembly includes a first bus bar disposed on one side of the array of cell pieces in a transverse direction, the first bus bar extending in a longitudinal direction, positive and negative ends of the first and second cell string groups are connected to the first bus bar, positive and negative ends of the second cell string group are located between the positive and negative ends of the first cell string group and are connected to the first bus bar, and the bypass diode is disposed on the first bus bar and is connected between the positive and negative ends of the second cell string.

4. The assembly according to claim 1, further comprising a second bus bar and a third bus bar on a side of the array of cells opposite the bypass diode, the second bus bar connecting the two first cell strings together at one end in series to form the first cell string set, the third bus bar connecting adjacent two second cell strings together in series to form the second cell string set.

5. The pv module according to claim 1, wherein the second string set is formed by connecting two strings of the second strings in series, the two strings of the second strings are disposed between the two strings of the first strings, and the number of half cells of the first strings is the same as that of the second strings.

6. The photovoltaic module of claim 5, wherein the first string of cells and the second string of cells are each formed by cascading 10-12 half-cells.

7. The photovoltaic module of claim 1, wherein the number of the cell string units is at least 3, at least 3 of the cell string units are arranged along the longitudinal direction, the number of the bypass diodes is also at least 3, and each cell string unit corresponds to at least one bypass diode.

8. A photovoltaic system comprising a plurality of photovoltaic modules according to any one of claims 1 to 7, wherein a plurality of said photovoltaic modules are arranged in an array.

9. The photovoltaic system according to claim 8, wherein in a front-back direction of the arrangement of the photovoltaic module arrays, an orthographic projection of a front one of the photovoltaic modules onto a plane where the cell array of a rear one of the photovoltaic modules is located blocks the first cell string of the cell string unit that is lowest in a longitudinal direction of the rear one of the photovoltaic modules.

10. The photovoltaic system according to claim 8, wherein as the illumination time varies, the area of the shadow formed by the previous photovoltaic module on the next photovoltaic module is less than or equal to half of the area of the next photovoltaic module in the front-back direction of the array arrangement of the photovoltaic modules.

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