CN114388641B - A kind of photovoltaic module and photovoltaic module array - Google Patents

Abstract

The embodiment of the application relates to the field of photovoltaics, and provides a photovoltaic module and a photovoltaic module array. The photovoltaic module includes: the photovoltaic module is provided with a first direction and a second direction which are opposite, and the number of the battery pieces in the first direction is larger than that of the battery pieces in the second direction; the diode comprises a first diode and a second diode, the first diode is connected with the positive electrode and the negative electrode of the first battery string through a first bus bar, and in the second direction, the first diode is close to the edge of the photovoltaic module; the second diode is positioned between the battery strings in the middle of the photovoltaic module in the second direction; in the first direction, the distance between the first diode and the second diode is greater than or equal to 1/2 of the length of the photovoltaic module in the first direction; the first bus bar is at a distance from the edge of the photovoltaic module in the second direction of less than or equal to 1/4 of the length of the photovoltaic module in the second direction. The photovoltaic module provided by the embodiment of the application can improve the problem of overlarge total transmission loss of the photovoltaic module.

Description

A kind of photovoltaic module and photovoltaic module array

technical field

The embodiments of the present application relate to the field of photovoltaics, and in particular to a photovoltaic module and a photovoltaic module array.

Background technique

The power generation of a photovoltaic power station is determined by three factors: installed capacity, hours of effective use of sunlight radiation, and system efficiency. Photovoltaic power generation systems cause power loss in varying degrees in various links of power generation, transmission, and Internet access, such as attenuation of photovoltaic modules, photovoltaic array loss (snow, dust), inverter efficiency, box-type efficiency, DC line loss, and AC line loss. damage, equipment failure, etc.

As the demand for photovoltaic cost reduction continues to increase, the size of the cells used on the photovoltaic module side is also increasing, but the increase in the size of the cells will lead to the continuous increase of the external cable transmission loss of the photovoltaic module and the internal loss of the photovoltaic module, thereby reducing The efficiency and power consumption of photovoltaic modules further affect the overall output power and transmission loss of the system.

Contents of the invention

Embodiments of the present application provide a photovoltaic module and a photovoltaic module array, which at least help to improve the problem of excessive total transmission loss of the photovoltaic module.

An embodiment of the present application provides a photovoltaic module, including: the photovoltaic module has a first direction and a second direction opposite to each other, the number of cells in the first direction is greater than the number of cells in the second direction; a plurality of battery strings, including A battery string and a second battery string, the battery string is formed by connecting battery slices in series; the diode includes a first diode and a second diode, and the first diode is connected to the anode of the first battery string and the first battery string through a first bus bar. In the second direction, the first diode is close to the edge of the photovoltaic module; in the second direction, the second diode is located between the battery strings in the middle of the photovoltaic module; in the first direction, the first diode The distance between the tube and the second diode is greater than or equal to 1/2 of the length of the photovoltaic module in the first direction; the distance between the first bus bar and the edge of the photovoltaic module in the second direction is less than or equal to 1 of the length of the photovoltaic module in the second direction /4.

In addition, in the second direction, the distance between the first diode and the second diode is greater than or equal to 1/4 of the length of the photovoltaic module in the second direction and less than or equal to 1/2 of the length of the photovoltaic module in the second direction.

In addition, in the second direction, the distance between the first diode and the second diode is greater than or equal to 3/8 of the length of the photovoltaic module in the second direction.

In addition, the number of battery slices in the battery string is 3 to 90 pieces, and the battery slices are sliced batteries, including two slices, three slices, and four slices.

In addition, the photovoltaic module further includes: a lead end, and in the second direction, the distance between the lead end and the first bus bar ranges from 5 mm to 30 mm.

In addition, the photovoltaic module also includes: opposite front and back; an isolation layer, the isolation layer and the first bus bar are located on the back of the photovoltaic module, the isolation layer is located between the photovoltaic module and the first bus bar, and the isolation layer is made of insulating material. ,

In addition, the photovoltaic module also includes: a second bus bar, the second bus bar is connected to the first bus bar, and the second bus bar includes a first part and a second part; the second battery string is divided into the first sub-battery string in the second direction and the second sub-battery string, the first sub-battery string and the second sub-battery string are parallel to each other in the first direction; the first part of the second bus bar connects the second diode and the first sub-battery string of the second battery string , the second part of the second bus bar is connected to the second diode and the second sub-battery string of the second battery string; the first part and the second part are arranged at intervals in the first direction.

In addition, the distance between the first part and the second part in the first direction is smaller than or equal to the width of the battery sheet in the first direction.

In addition, the photovoltaic module also includes: a third diode, a third battery string and a third bus bar, the third battery string is located between the first battery string and the second battery string, and the third diode passes through the third bus bar The positive pole and the negative pole of the third battery string are connected, and the third bus bar is connected with the first bus bar and the second bus bar.

Correspondingly, an embodiment of the present application also provides a photovoltaic module array, including: a plurality of photovoltaic modules connected in series, the photovoltaic module being any one of the above photovoltaic modules; a junction box, the junction box is located on the back of the photovoltaic module.

In addition, the junction box includes a first junction box and a second junction box, the first junction box is composed of a diode, a box body and a connector socket, the second junction box is composed of another diode, a box body, a cable and a connector, and the connector Connect with the connector socket of the adjacent photovoltaic module.

The technical solutions provided by the embodiments of the present application have at least the following advantages:

In the technical solution of the photovoltaic module provided by the embodiment of the application, the distance between the first diode and the second diode is greater than or equal to 1/2 of the length of the photovoltaic module in the first direction, which is equivalent to the first diode or the second diode. The battery string with two diodes in reverse parallel has a moderate number of cells, which can avoid too many cells connected in parallel with diodes, which will exceed the reverse bias limit of the solar cell and damage the photovoltaic module; the first diode The tube is close to the edge of the module and the distance between the first bus bar and the edge of the photovoltaic module in the second direction is less than or equal to 1/4 of the length of the second direction of the photovoltaic module, which can greatly reduce the length of the first bus bar and ensure transmission loss At least, shortening the length of the first bus bar is beneficial to reducing the internal resistance of the photovoltaic module, so that the total transmission loss of the photovoltaic module is lower. In the assembly between battery modules or in the photovoltaic module array, the first diode is close to the edge of the module and the distance between the first bus bar and the edge of the photovoltaic module in the second direction is less than or equal to 1/ of the length of the photovoltaic module in the second direction 4. It can also greatly shorten the cable length on the junction box, thereby reducing the internal resistance of the junction box and the series resistance of photovoltaic modules, and improving the stability of the junction box and photovoltaic modules, so that the assembly between battery modules is more efficient. It is convenient, helps to reduce production costs and the risk of short circuit and open circuit, and also helps to improve the problem of excessive total transmission loss of photovoltaic modules.

Description of drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings, and these exemplifications do not constitute a limitation to the embodiments. Elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the drawings in the drawings are not limited to scale.

Fig. 1 is a schematic diagram of a circuit connection of a photovoltaic module provided by an embodiment of the present application;

Fig. 2 is a back top view of a photovoltaic module provided by an embodiment of the present application;

Fig. 3 is an enlarged view of the leading end and the first bus bar of the photovoltaic module provided by an embodiment of the present application;

Fig. 4 is a top view of the leading end and the first bus bar of the photovoltaic module provided by an embodiment of the present application;

Fig. 5 is a schematic structural diagram of the second bus bar of the photovoltaic module provided by an embodiment of the present application;

Fig. 6 is a schematic structural diagram of the second bus bar of the photovoltaic module provided by another embodiment of the present application;

Fig. 7 is a schematic structural diagram of a first junction box provided by an embodiment of the present application;

Fig. 8 is a schematic structural diagram of a second junction box provided by an embodiment of the present application.

Detailed ways

Various embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in each embodiment of the application, many technical details are provided for readers to better understand the application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can also be realized.

Referring to Figures 1 to 5, Figure 1 is a schematic diagram of a circuit connection of a photovoltaic module provided by an embodiment of the application; Figure 2 is a top view of the back of the photovoltaic module provided by an embodiment of the application; Figure 3 is an embodiment of the application An enlarged view of the lead-out end and the first bus bar of the provided photovoltaic module; Fig. 4 is a top view of the lead-out end and the first bus bar of the photovoltaic module provided by an embodiment of the application, and Fig. 5 is a photovoltaic module provided by an embodiment of the application A schematic diagram of the structure at the second bus bar of the module. The photovoltaic module includes: the photovoltaic module has a relative first direction Y and a second direction X, and the number of cells in the first direction Y is greater than the number of cells in the second direction X A plurality of battery strings, including a first battery string 301 and a second battery string 302, the battery strings are formed by connecting battery slices in series; diodes, including a first diode 211 and a second diode 221, the first diode 211 The anode and cathode of the first battery string 301 are connected through the first bus bar. In the second direction X, the first diode 211 is close to the edge of the photovoltaic module; the second diode 221 is in the second direction X, located at the Between the battery strings in the middle of the module; in the first direction Y, the distance between the first diode 211 and the second diode 221 is greater than or equal to 1/2 of the length of the photovoltaic module in the first direction Y; the first bus bar The distance from the edge of the photovoltaic module in the second direction X is less than or equal to 1/4 of the length of the photovoltaic module in the second direction X.

The distance between the first diode 211 and the second diode 221 is greater than or equal to 1/2 of the length of the photovoltaic module in the first direction, which is equivalent to a battery in which the first diode 211 or the second diode 221 are connected in antiparallel The number of cells in the string is moderate, which can avoid too many cells connected in parallel with diodes, which will exceed the reverse bias limit of the solar cell and damage the photovoltaic module; the first diode 211 is close to the edge of the module and the first confluence The distance between the bar and the edge of the photovoltaic module in the second direction X is less than or equal to 1/4 of the length of the photovoltaic module in the second direction X, which can greatly reduce the length of the first bus bar and ensure the minimum transmission loss, shortening the first The length of the bus bar is beneficial to reduce the internal resistance of the photovoltaic module, so that the total transmission loss of the photovoltaic module is low. In the assembly between battery modules or in the photovoltaic module array, the first diode 211 is close to the edge of the module and the distance between the first bus bar and the edge of the photovoltaic module in the second direction X is less than or equal to the length of the second direction X of the photovoltaic module 1/4 of the junction box can also greatly shorten the length of the cable on the junction box, thereby reducing the internal resistance of the junction box and the series resistance of the photovoltaic module, and improving the stability of the junction box and the photovoltaic module, so that the battery module The assembly is more convenient, which is conducive to reducing production costs and the risk of short circuit and open circuit, and is also conducive to improving the problem of excessive total transmission loss of photovoltaic modules. In some embodiments, the photovoltaic module further includes: a plurality of battery strings forming a battery array, and the first battery string 301 includes several battery groups connected in parallel. The battery array is a photovoltaic array of photovoltaic modules, and the photovoltaic array module directly converts solar energy into electrical energy based on the principle of photoelectric effect. In some embodiments, the first battery string 301 includes two groups, respectively the third sub-battery string 303 and the fourth sub-battery string 304; the third sub-battery string 303 and the fourth sub-battery string 304 each include three parallel-connected Specifically, the third sub-battery string 303 includes three first battery packs 401 , 402 , 403 ; the fourth sub-battery string 304 includes second battery packs 404 , 405 , 406 .

In some embodiments, the second battery string 302 is divided into a first sub-battery string and a second sub-battery string in the second direction X, the first sub-battery string and the second sub-battery string are parallel to each other in the first direction, and the second sub-battery string is parallel to each other. One sub-battery string is connected with the second sub-battery string to form the second battery string 302, and the positive pole and the negative pole of the second battery string 302 are respectively connected with the third sub-battery string 303 and the fourth sub-battery string 304 to form a rectangular battery cell. battery array.

In some embodiments, the battery packs are arranged side by side, specifically, the third sub-battery string 303 and the fourth sub-battery string 304 are arranged side by side, namely: three first battery packs 401, 402, 403 and three second battery packs 404, 405, 406 are adjacently arranged side by side.

In some embodiments, the photovoltaic module further includes: a lead end, the lead end includes a positive lead end 111 and a negative lead end 112; an end bus bar 120, and the end bus bar 120 is respectively arranged at both ends of the battery array; the positive lead end 111 One end of the bus bar is electrically connected to the positive end of the battery array, and the negative terminal 112 is electrically connected to the negative end of the battery array through the other end of the bus bar.

Specifically, each battery string has a positive pole and a negative pole, and the terminal bus bar 120 includes a first terminal bus bar 121 and a second terminal bus bar 122 . The positive and negative poles of the three first battery packs 401, 402, 403 are in the same direction, and the positive terminals of the first battery packs 401, 402, 403 are connected through the first terminal bus bar 121 as the positive terminal of the third sub-battery string 303. The negative terminals of a battery pack 401 , 402 , 403 are connected as the negative terminal of the third sub-battery string 303 . The positive and negative poles of the three second battery packs 404, 405, 406 are in the same direction, and the positive terminals of the second battery packs 404, 405, 406 are connected as the positive terminals of the fourth sub-battery string 304. The second battery packs 404, 405, 406 The negative terminals of the battery cells are connected through the second terminal bus bar 122 as the negative terminal of the fourth sub-battery string 304 . The positive and negative electrodes of the third sub-battery string 303 and the fourth sub-battery string 304 are in opposite directions. The negative electrode of the third sub-battery string 303 and the positive electrode of the fourth sub-battery string 304 are located on the same side and connected through interconnection bars.

Further, the leading end also includes a first leading end connected to the positive end of the third sub-battery string 303, a second leading end connected to the negative end of the third sub-battery string 303 and the positive end of the fourth sub-battery string 304, The third terminal connected to the negative terminal of the fourth sub-battery string 304 . The first terminal is the positive terminal 111 of the photovoltaic module, and the third terminal is the negative terminal 112 of the photovoltaic module, that is, the positive terminal 111 is electrically connected to the positive terminal of the battery array, and the negative terminal 112 is electrically connected to the negative terminal of the battery array. .

In some embodiments, the first diode 211 is connected to the anode and cathode of the first battery string 301 through the first bus bar, specifically, one end of the first diode 211 is electrically connected to the first bus bar, and the first diode 211 is electrically connected to the first bus bar. The other end of the tube 211 is electrically connected to the leading end, wherein, the other end of the first diode 211 is electrically connected to the anode leading end 111, which is equivalent to the connection of the first diode 211 to the positive pole of the first battery string 301, and the first diode 211 The other end is electrically connected to the negative terminal 112, which is equivalent to the connection of the first diode 211 to the negative pole of the first battery string 301. The third sub-battery string 303 has a first part 313 and a second part 323 equally divided, and the first part 313 is located away from On one side of the fourth sub-battery string 304, the positive terminal 111 is located in the first part 313 of the third sub-battery string 303, that is, the first diode 211 is located in the first part 313; the fourth sub-battery string 304 has an evenly divided The third part 314 and the fourth part 324, the fourth part 324 is located on the side away from the third sub-battery string 303, the negative terminal 112 is located in the fourth part 324 of the fourth sub-battery string 304, that is, the first diode 211 Located within the fourth section 324 . The first diode 211 is located in the first part 313 of the third sub-battery string 303; the other first diode 211 is located in the fourth part 324 of the fourth sub-battery string 304, or the positive terminal 111 is located in the third sub-battery string The first part 313 of 303; the negative terminal 112 is located in the fourth part 324 of the fourth sub-battery string 304, which can greatly shorten the length of the positive terminal 111 and the negative terminal 112, thereby reducing the battery array in the photovoltaic module. Internal resistance, so that the total output loss of the photovoltaic module is low. In the assembly between battery modules, the first diode 211 is located in the first part 313 of the third sub-battery string 303; the other first diode 211 is located in the fourth part 324 of the fourth sub-battery string 304, which can also be very large The cable length of the junction box is shortened to a certain extent, thereby reducing the transmission resistance, and improving the stability of the connection between the junction box and the positive terminal 111 or the connection between the junction box and the negative terminal 112, so that the assembly between the battery modules is more convenient , which is conducive to reducing the cost and the risk of short circuit and open circuit, and is also conducive to improving the problem of excessive total output loss of photovoltaic modules.

In some embodiments, along the first direction Y, the first diode 211 is located at the end of the battery array or the positive terminal 111 and the negative terminal 112 are located at the end of the battery array, reducing the number of positive terminals 111 and The length of the negative terminal 112 reduces the internal resistance of the photovoltaic module, thereby reducing the transmission loss of the photovoltaic module. In some other embodiments, one of the positive terminal 111 and the negative terminal 112 is located at the end of the battery array. It is worth noting that this application does not limit the specific positions of the positive terminal 111 and the negative terminal 112 parallel to the first direction Y of the photovoltaic module, as long as the first diode 211 is close to the second direction X along the second direction X. The edge will do.

In some embodiments, in the second direction X, the distance between the first diode 211 and the second diode 221 is greater than or equal to 1/4 of the length of the photovoltaic module in the second direction X and less than or equal to the second length of the photovoltaic module. 1/2 of the length in the direction X, and more specifically, the distance between the first diode 211 and the second diode 221 is greater than or equal to 3/8 of the length of the photovoltaic module in the second direction X, specifically, it can be 3/8, 7/12, 4/9 or 1/2, this distance range is equivalent to further elaborating the distance between the first diode 211 and the distance between the first diode 211 and the edge of the component, which can greatly shorten the wiring The length of the cable inside the box reduces the internal resistance of the junction box and the series resistance of the photovoltaic module, and improves the stability of the junction box and the photovoltaic module, thereby making the assembly between the battery modules more convenient, which is conducive to reducing production costs and short circuits And the risk of open circuit is also conducive to improving the problem of excessive total transmission loss of photovoltaic modules.

In some embodiments, when the number of battery packs connected in parallel is an odd number, the middle position of the outermost battery string of the battery array is the middle position of the battery pack. In other embodiments, when the number of battery packs connected in parallel is an even number, the middle position of the battery string may be between adjacent battery packs.

In some embodiments, an insulating layer 113 is further included between the positive terminal 111 and the battery string and between the negative terminal 112 and the battery string, and the positive terminal 111 or the negative terminal 112 is bonded and fixed to one side of the insulating layer 113 , the other side of the insulating layer 113 is attached to the back of the battery string to realize the insulation of the positive terminal 111 or the negative terminal 112 from the battery string and avoid short circuit.

In some embodiments, the number of battery slices in the battery string is 3 to 90 pieces, specifically 10 pieces, 30 pieces, 50 pieces, 70 pieces or 90 pieces; slices, quarter slices, etc.

In some embodiments, the size of the battery sheet can be 156.75mm, 158.75mm, 166mm, 182mm, 210mm; the shape of the battery sheet can be rectangular, circular, square, short-sighted rectangle, etc.; the battery sheet can be a monocrystalline silicon solar cell , polycrystalline silicon solar cells, amorphous silicon solar cells or multi-component solar cells, and the multi-component solar cells may specifically be cadmium sulfide solar cells, gallium arsenide solar cells, copper indium selenide solar cells or perovskite solar cells.

In some embodiments, the photovoltaic module also includes an opposite front and back, the front of the photovoltaic module is the light-receiving surface of the solar cell, and the back of the photovoltaic module is the backlight surface of the solar cell; the first bus bar is a bypass bus bar, and the bypass bus bar The bus bar is located on the back of the photovoltaic module, which reduces the shading area of the light-receiving surface of the photovoltaic module, which is equivalent to increasing the effective light-receiving area of the light-receiving surface of the photovoltaic module, which is conducive to improving the photoelectric conversion efficiency of the photovoltaic module; the isolation layer 133 is located on the photovoltaic module. The back side of the component, and the isolation layer 133 is located between the photovoltaic component and the first bus bar, and the isolation layer 133 is made of insulating material.

Specifically, in some embodiments, along the second direction X, the width of the first bus bar ranges from 1 mm to 20 mm, specifically 2 mm, 5 mm, 10 mm, 15 mm or 20 mm; the thickness range of the first bus bar is 0.1mm to 1mm, specifically 0.1mm, 0.3mm, 0.5mm, 0.8mm or 1mm; the width of the isolation layer 133 is 5mm to 30mm, specifically 5mm, 10mm, 15mm, 20mm or 30mm; the width of the isolation layer 133 The thickness ranges from 0.1mm to 0.5mm, specifically 0.1mm, 0.2mm, 0.3mm, 0.4mm or 0.5mm; this application does not limit the ratio of the specific width of the first bus line to the isolation layer 133, and only needs to satisfy the isolation It is enough that the width of the layer 133 is greater than or equal to the width of the first bus line.

In some embodiments, the first bus bar includes a first bypass bus bar 131 and a second bypass bus bar 132, the first bypass bus bar 131 is close to the positive terminal 111; the second bypass bus bar 132 and The negative terminal 112 is close to each other; along the second direction X, the distance between one end of the first bypass bus bar 131 and the end of the positive terminal 111 away from the first terminal bus bar 121 ranges from 5 mm to 30 mm, specifically 5 mm, 10mm, 20mm, 25mm or 30mm; the distance between one end of the second bypass bus bar 132 and the end of the negative terminal 112 away from the second end bus bar 122 ranges from 5mm to 30mm, specifically 5mm, 10mm, 20mm, 25mm or 30mm . The distance range between one end of the first bypass bus bar 131 and the end of the positive terminal 111 away from the first terminal bus bar 121 and the distance between one end of the second bypass bus bar 132 and the negative terminal 112 away from the end of the second terminal bus bar 122 The range ensures the stability of the connection between the junction box and the terminal, thus making the assembly of battery modules more convenient.

In some embodiments, the first bus bar is located on the back of the battery packs of the battery string. In other embodiments, the first bus bar is located between adjacent battery packs. This application does not make any specific location of the first bus bar. Restricted, it only needs to satisfy that the distance between the first bus bar and the edge of the photovoltaic module in the second direction X is less than or equal to 1/4 of the length of the photovoltaic module in the second direction X, and the distance between the lead-out end and the first bus bar is 5mm ~ 30mm is enough.

In some embodiments, the extension direction of the first bypass bus bar 131 is the same as the first direction Y; the extension direction of the second bypass bus bar 132 is the same as the first direction Y, which is equivalent to the first bypass bus bar 131 or The extension direction of the second bypass bus bar 132 is perpendicular to the extension direction of the end bus bar, which can greatly shorten the length of the first bypass bus bar 131 and the second bypass bus bar 132, thereby reducing the size of the photovoltaic module. The internal resistance of the internal battery array, so that the total output loss of the photovoltaic module is low. In other embodiments, the extension direction of the first bypass bus bar 131 is different from the first direction Y; the extension direction of the second bypass bus bar 132 is different from the first direction Y, and this application does not apply to the first bypass The extending direction of the bus bar 131 and the extending direction of the second bypass bus bar 132 are limited, as long as the distance between the leading end and the first bus bar is in the range of 5 mm to 30 mm.

In some embodiments, the first bus bar is bonded to one side of the isolation layer 133, and the other side of the isolation layer 133 is attached to the back of the photovoltaic module. For the adhesive layer, the first bus bar can be bonded and fixed with the isolation layer 133 through the adhesive layer to form a whole. The adhesive layer can be an adhesive film with certain viscosity, such as a POE adhesive film. When the adhesive film is heated, its surface can be slightly melted, so that the surface of the adhesive film can have a certain viscosity and facilitate bonding. Since the side of the isolation layer 133 away from the first bus bar also has an adhesive layer, the first bus bar can be bonded to the back side of the photovoltaic module through the adhesive layer to realize the first bus bar and battery string. insulation to avoid short circuits.

In some embodiments, the photovoltaic module further includes: a second bus bar, the second bus bar is a middle bus bar, and the middle bus bar is located on the back of the photovoltaic module and connected to the corresponding first bus bar. The second bus bar prevents the number of battery strings connected in parallel by the end bus bars from being too large, exceeding the limit of the reverse bias voltage of the battery, and further damaging the photovoltaic module. If the hot spot effect does not occur, the second bus bar will not have current flow, so the power of the module will not be reduced, but the power of the module will be slightly increased; if the hot spot effect occurs when the module generates power outdoors, since the current follows the path of the lowest resistance In principle, the second bus bar will provide more current paths for the current to ensure that the current has other feasible paths, so that the current can avoid the hot spot cells, reduce the hot spot effect and increase the power generation.

In some embodiments, referring to FIG. 5, the second bus bar is located on the back of the battery pack of the battery string, that is, the second bus bar is located on the back of the battery sheet; along the first direction Y, the width of the second bus bar is 1mm ~20mm, specifically 1mm, 8mm, 15mm or 20mm; the thickness of the second bus bar ranges from 0.05mm to 0.6mm, specifically 0.05mm, 0.1mm, 0.3mm or 0.6mm. The width range and thickness range of the second bus bar ensure that the cross-sectional area of the second bus bar is sufficient for the current distribution of the battery strings connected in parallel, so as to prevent the thin second bus bar from distributing too much current and exceeding the safe carrying capacity. The second bus bar is located on the back of the battery string, which is equivalent to one side of the second bus bar being attached to the battery string. The thickness range can ensure the tightness and compactness of the subsequent packaging, and the width range makes the surface area of the second bus bar larger. It is beneficial to improve the heat dissipation effect of the second bus bar.

In some embodiments, the second bus bar includes a first portion 141 and a second portion 142, the first portion 141 of the second bus bar is connected to the second diode 221 and the first sub-battery string of the second battery string 302, the second The second part 142 of the second bus bar is connected to the second sub-battery string of the second diode 221 and the second battery string 302; the first part 141 of the second bus bar and the second part 142 of the second bus bar are in the first The distances between the first part 141 and the second part 142 of the second bus bar are different from the negative electrode or the output end of the photovoltaic module, so there is a potential difference between the first part 141 and the second part 142, and the first part 141 and the second part The arrangement of the portions 142 at intervals in the first direction Y is beneficial to avoid low voltage due to potential difference, and is beneficial to improve the output efficiency of the photovoltaic module.

In some embodiments, the distance between the first part 141 of the second bus bar and the second part 142 of the second bus bar in the first direction Y is less than or equal to the width of the cell sheet in the first direction Y, and the distance between the first part 141 and the second The part 142 is connected through the second diode 221 , and this range of distance can ensure the solidity of the connection between the first part 141 and the second part 142 and the second diode 221 , so that the problem of excessive loss of the photovoltaic module can be improved.

In some other embodiments, refer to FIG. 6, which is a schematic structural diagram of the second bus bar of the photovoltaic module provided in other embodiments of the present application. The second bus bar is located between adjacent battery strings, that is, the second bus bar The second bus bar is located in the area without cells; in the first direction Y, the width of the second bus bar ranges from 1mm to 8mm, specifically 1mm, 3mm, 6mm or 8mm; the thickness of the second bus bar ranges from 0.05mm ~4mm, specifically 0.05mm, 0.1mm, 1mm or 4mm. The width range and thickness range of the second bus bar ensure that the cross-sectional area of the second bus bar is sufficient for the current distribution of the battery strings connected in parallel, so as to prevent the thin second bus bar from distributing too much current and exceeding the safe carrying capacity. The second bus bar is located between adjacent battery strings, the width range of the second bus bar corresponds to the distance between adjacent battery strings, and the thickness range makes the surface area of the second bus bar large, which is conducive to improving the second bus bar. heat radiation.

In some embodiments, the first area 21 and the second area 22 are junction box installation locations, the first diode 211 is located in the first area 21 , and the second diode 221 is located in the second area 22 .

In some embodiments, the photovoltaic module further includes: a third diode, a third battery string and a third bus bar, the third battery string is located between the first battery string 301 and the second battery string 302, and the third diode The tubes are connected to the positive pole and the negative pole of the third battery string through the third bus bar, and the third bus bar is connected to the first bus bar and the second bus bar; the third bus bar includes the fourth bypass bus bar and the fifth bypass bus bar. It should be noted that, from the positive output end of the component to the negative output end, the first diode 211 , the second diode 221 and the third diode form a series structure.

In the photovoltaic module provided by some embodiments of the present application, the distance between the first diode 211 and the second diode 221 is greater than or equal to 1/2 of the length of the photovoltaic module in the first direction, which is equivalent to the first diode 211 or the second diode. The number of battery slices in the battery string connected in reverse parallel with the two diodes 221 is moderate, which can prevent the number of battery slices connected in parallel with the diodes from being too large, which will exceed the reverse bias limit of the solar cell and damage the photovoltaic module; the first two The pole tube 211 is close to the edge of the module and the distance between the first bus bar and the edge of the photovoltaic module in the second direction X is less than or equal to 1/4 of the length of the photovoltaic module in the second direction X, which can greatly reduce the length of the first bus bar And to ensure the minimum transmission loss, shortening the length of the first bus bar is beneficial to reduce the internal resistance of the photovoltaic module, so that the total transmission loss of the photovoltaic module is low. In the assembly between battery modules or in the photovoltaic module array, the first diode 211 is close to the edge of the module and the distance between the first bus bar and the edge of the photovoltaic module in the second direction X is less than or equal to the length of the second direction X of the photovoltaic module 1/4 of the junction box can also greatly shorten the length of the cable on the junction box, thereby reducing the internal resistance of the junction box and the series resistance of the photovoltaic module, and improving the stability of the junction box and the photovoltaic module, so that the battery module The assembly is more convenient, which is conducive to reducing production costs and the risk of short circuit and open circuit, and is also conducive to improving the problem of excessive total transmission loss of photovoltaic modules.

Correspondingly, the present application also provides a photovoltaic module array, including: a plurality of photovoltaic modules connected in series, the photovoltaic module being any one of the above photovoltaic modules; a junction box, the junction box is located on the back of the photovoltaic module.

In some embodiments, referring to FIG. 7 and FIG. 8, FIG. 7 is a schematic structural diagram of a first junction box provided in an embodiment of the present application, and FIG. 8 is a schematic structural diagram of a second junction box provided in an embodiment of the present application. The box includes a first junction box and a second junction box. The first junction box is composed of a connector socket 212, a box body 210 and a first diode 211 located in the box body 210. The connector socket 212 and the first diode 211 is connected and extended to the outside of the box body 210 , one end of the first diode 211 is electrically connected to the positive terminal 111 or the negative terminal 112 , and the other end of the first diode 211 is electrically connected to the first bus bar. The box body 210 has a connection channel 214 connected to the connector socket 212 and a first box bottom 215 in contact with the surface of the battery string. The area where the connector socket 212 is in contact with the first diode 211 forms a contact end 213; In some embodiments, the second junction box has a first diode 211, a connector 222, a second box body 220, and a cable 226, and the second box body 220 has a connection channel 224 connected to the connector 222 and a connection channel 224 connected to the connector 222. The second box bottom 225 where the surface of the battery string is in contact, the connector 222 is connected to the connector socket 212 of the adjacent photovoltaic module.

In some embodiments, the connector socket 212 is connected to the first diode 211 so as to reduce the number of welding points connected between the cable and the diode and the connector, which is beneficial to reduce the contact resistance between the cable and the diode and the connector, This in turn helps reduce transmission losses in high current components.

In some other embodiments, the first junction box is electrically connected to the negative terminal 112, specifically, one end of the first diode 211 is electrically connected to the negative terminal 112, and the other end of the first diode 211 is electrically connected to the second terminal. The bypass bus bar 132 is electrically connected; the second junction box is electrically connected to the positive terminal 111, specifically, one end of another first diode 211 is electrically connected to the positive terminal 111, and the other end of the first diode 211 It is electrically connected to the first bypass bus bar 131 .

Those of ordinary skill in the art can understand that the above-mentioned implementation modes are specific examples for realizing the present application, and in practical applications, various changes can be made to it in form and details without departing from the spirit and spirit of the present application. scope. Any person skilled in the art can make respective alterations and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be determined by the scope defined in the claims.

Claims (11)

1. A photovoltaic module, characterized in that, comprising: The photovoltaic module has a relative first direction and a second direction, and the number of cells in the first direction is greater than the number of cells in the second direction; A plurality of battery strings, including a first battery string and a second battery string, the battery strings are formed by connecting the battery slices in series; Diodes, including a first diode and a second diode, the first diode is connected to the anode and cathode of the first battery string through a first bus bar, and in the second direction, the first a diode near the edge of the photovoltaic module; The second diode is located between battery strings in the middle of the photovoltaic module in the second direction; The distance between the first diode and the second diode in the first direction is greater than or equal to 1/2 of the length of the photovoltaic module in the first direction; The distance between the first bus bar and the edge of the photovoltaic module in the second direction is less than or equal to 1/4 of the length of the photovoltaic module in the second direction. 2. The photovoltaic module according to claim 1, characterized in that the distance between the first diode and the second diode in the second direction is greater than or equal to the length of the photovoltaic module in the second direction 1/4 and less than or equal to 1/2 of the length of the photovoltaic module in the second direction. 3. The photovoltaic module according to claim 2, characterized in that, in the second direction, the distance between the first diode and the second diode is greater than or equal to the length of the photovoltaic module in the second direction 3/8. 4. The photovoltaic module according to claim 1, characterized in that, the number of battery slices in the battery string is 3 to 90 pieces, and the battery slices are sliced batteries, including two slices, three slices, four slices film etc. 5. The photovoltaic module according to claim 1, characterized in that, the photovoltaic module further comprises: a lead end, and in the second direction, the distance range between the lead end and the first bus bar 5mm to 30mm. 6. The photovoltaic assembly according to claim 1, wherein the photovoltaic assembly further comprises: opposite front and back; An isolation layer, the isolation layer and the first bus bar are located on the back of the photovoltaic module, the isolation layer is located between the photovoltaic module and the first bus bar, and the isolation layer is made of insulating material . 7. The photovoltaic assembly according to claim 1, wherein the photovoltaic assembly further comprises: a second bus bar connected to the first bus bar, the second bus bar including a first part and a second part; The second battery string is divided into a first sub-battery string and a second sub-battery string in the second direction, and the first sub-battery string and the second sub-battery string are parallel to each other in the first direction; The first part of the second bus bar is connected to the second diode and the first sub-battery string of the second battery string, and the second part of the second bus bar is connected to the second diode and the first sub-battery string of the second battery string. a second sub-string of the second battery string; The first portion and the second portion are spaced apart in the first direction. 8 . The photovoltaic module according to claim 7 , wherein the distance between the first portion and the second portion in the first direction is smaller than or equal to the width of the battery sheet in the first direction. 9. The photovoltaic module according to claim 1, characterized in that, the photovoltaic module further comprises: a third diode, a third battery string and a third bus bar, the third battery string is located in the first battery string Between the second battery string, the third diode is connected to the anode and cathode of the third battery string through the third bus bar, and the third bus bar is connected to the first bus bar and the second bus bar . 10. A photovoltaic module array, characterized in that, comprising: A plurality of photovoltaic modules connected in series, the photovoltaic module is the photovoltaic module described in any one of claims 1-9; A junction box, the junction box is located at the back of the photovoltaic module. 11. A plurality of photovoltaic modules connected in series according to claim 10, characterized in that, the junction box comprises a first junction box and a second junction box, and the first junction box is composed of the diode, box body and connection The second junction box is composed of another diode, a box body, a cable and a connector, and the connector is connected to the connector socket of the adjacent photovoltaic module.

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