CN209561427U - Photovoltaic modules - Google Patents

Abstract

The utility model provides a photovoltaic module, comprising a front plate, a battery layer and a back plate, the battery layer includes a plurality of battery string groups connected in series and a bypass diode, each battery string group includes a plurality of battery strings connected in parallel, each Each battery string group is connected in parallel with a bypass diode, and it is characterized in that: each battery string includes a number of series-connected one-third sliced battery slices. The utility model realizes that the working current inside the photovoltaic module is one third of that of the traditional photovoltaic module by welding one third of the cells into a string, thereby reducing the component caused by the series resistance of the cells inside the photovoltaic module. Power loss, improve the power output of photovoltaic modules; in addition, by connecting a bypass diode in parallel with each battery string, the photovoltaic modules can be effectively protected when the photovoltaic modules are shaded and hot plate effect, and the work of the photovoltaic modules can be reduced. temperature and hot spot risk, extending the service life of the PV modules.

Description

Photovoltaic modules

technical field

The utility model relates to the field of photovoltaics, in particular to a photovoltaic assembly.

Background technique

During the working process of the solar cell module, if there is a shadow covering one or some cells, the output of other cells connected in series with the shadow cell will be consumed on the cell, and this energy consumption will lead to the PN junction. the local breakdown and cause local overheating, which is the hot spot effect. In order to prevent solar cells from being damaged due to the hot spot effect, the usual solution is to add bypass diodes on the basis of the original circuit. When the light is not blocked, each diode is in reverse bias, and each cell is generating electricity. . When a cell is blocked, it will stop generating electricity and become a high-resistance resistor. At the same time, other cells will push it to reverse bias, causing the diode connecting the two ends of the cell to conduct. The current that originally flowed through the blocked cell is blocked by the diode. shunt.

In the prior art, a solar half-cell photovoltaic module includes a plurality of battery strings, and each battery string includes two battery strings arranged in parallel and connected in series. Generally, a connection method in which two battery strings are connected in parallel and share a diode is used. When most of the components are partially occluded in the circuit, the output power of the components will be lower than the power output of the whole battery component, which will bring great hidden dangers to practical applications.

In view of this, it is necessary to design an improved photovoltaic module to solve the above problems.

Utility model content

The purpose of the present invention is to provide a photovoltaic module with higher output power.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a photovoltaic module, comprising a front plate, a battery layer and a back plate, the battery layer includes a plurality of battery strings connected in series and bypass diodes, each battery string It includes a plurality of battery strings connected in parallel, each battery string group is connected in parallel with a bypass diode, and each battery string includes a number of series-connected one-third sliced battery slices.

As a further improved technical solution of the present invention, the battery string group includes a first battery string group, a second battery string group and a third battery string group connected in series, and the battery string group has a first electrode and a second battery string group. electrode.

As a further improved technical solution of the present invention, the first electrode of the first battery string is connected with a first lead wire, and the second electrode of the first battery string is connected to the first electrode of the second battery string There is a second lead wire, a third lead wire is connected to the second electrode of the second battery string group and the first electrode of the third battery string group, and the first electrode of the third battery string group is connected to the first electrode. Four lead wires, a first bypass diode is arranged between the first lead wire and the second lead wire, a second bypass diode is arranged between the second lead wire and the third lead wire, A third bypass diode is arranged between the third lead wire and the fourth lead wire, so that the bypass diode is connected in parallel with the corresponding battery string.

As a further improved technical solution of the present invention, the first battery string group includes three first battery strings connected in parallel, the second battery string group includes three second battery strings connected in parallel, the first battery string and the third battery string are connected in parallel. Two battery strings are arranged side by side; the third battery string group includes six third battery strings arranged side by side, the six third battery strings are respectively connected with the first battery strings of the first battery string group and the second battery string group and the second battery strings are arranged in alignment, and the third battery strings are connected in series and then connected in parallel.

As a further improved technical solution of the present invention, a bus bar with one end connected to the first electrode of the first battery string and the second electrode of the second battery string is arranged between the first battery string group and the second battery string group.

As a further improved technical solution of the present invention, the first electrode is a negative electrode, and the second electrode is a positive electrode.

As a further improved technical solution of the present invention, an insulating strip is provided between the one-third sliced battery sheet and the corresponding bus bar.

As a further improved technical solution of the present invention, the material of the insulating strip is pearl cotton.

As a further improved technical solution of the present invention, the number of the one-third sliced cells connected in parallel with a single bypass diode is not more than 24.

As a further improved technical solution of the present invention, the second electrode of the first battery string is the positive output end of the photovoltaic module, and the first electrode of the third battery string is the negative output of the photovoltaic module end.

As can be seen from the above technical solutions, the utility model realizes that the working current inside the photovoltaic module is one third of that of the traditional photovoltaic module by welding one third of the cells into a string, so that the internal cells of the photovoltaic module can be reduced. In addition, by connecting a bypass diode in parallel with each battery string, it can effectively protect the photovoltaic modules when the photovoltaic modules are shaded and the hot plate effect, reducing the The operating temperature and hot spot risk of the photovoltaic modules prolong the service life of the photovoltaic modules.

Description of drawings

Fig. 1 is the stacking schematic diagram of the photovoltaic module of the present invention;

Fig. 2 is the structural schematic diagram of the battery layer in Fig. 1;

Fig. 3 is the enlarged view of the lead-out wire and insulating block in Fig. 2;

Fig. 4 is the internal circuit diagram of the battery layer of the utility model;

Detailed ways

In order to make the objectives, technical solutions and advantages of the present utility model more clear, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to FIGS. 1 to 4 , a photovoltaic module 100 includes a front plate 110 , a front encapsulation film 120 , a battery layer 130 , a rear encapsulation film 140 and a back plate 150 , which are sequentially stacked from top to bottom. . The battery layer 130 includes a number of battery strings connected in series, each battery string group includes a number of battery strings connected in parallel, and each battery string includes a number of one-third sliced battery sheets 10 connected in series. Wherein, each group of battery strings is connected in parallel with a bypass diode through the lead wire respectively.

Preferably, the battery string group of the present invention includes three groups, namely a first battery string group 131, a second battery string group 132 and a third battery string group 133; each battery string group includes three groups of batteries connected in parallel String, specifically, the first battery string 131 includes three first battery strings 1311, 1312, 1313; the second battery string 132 includes three second battery strings 1321, 1322, 1323; the third battery string 133 It includes six third battery strings 1331, 1332, 1333, 1334, 1335, and 1336, of which 1333 and 1334 are connected in series, 1332 and 1335 are connected in series, and 1331 and 1336 are connected in series.

The one-third sliced cell 10 is formed by dividing a conventional cell into three by using a dicing technique (laser cutting technique or other commonly used cutting techniques). In this embodiment, the one-third sliced battery sheets 10 are welded into a string using an automatic string welding machine to obtain a battery string.

The battery strings are arranged side by side. Specifically, the first battery string group 131 and the second battery string group 132 are arranged side by side, that is, three first battery strings 1311 , 1312 , 1313 and three second battery strings 1321 , 1322 , 1323 phase Adjacent to each other, the six third battery strings 1331, 1332, 1333, 1334, 1335, and 1336 are arranged side by side. Preferably, three first battery strings 1311, 1312, 1313 and three second battery strings 1321, 1322, 1323 are laterally arranged side by side on the left side, and six third battery strings 1331, 1332, 1333, 1334, 1335, 1336 The battery layers 130 are formed laterally side by side on the right side to form a rectangular battery layer 130 .

Each battery string has a positive electrode and a negative electrode. The positive and negative electrodes of the three first battery strings 1311, 1312, and 1313 are in the same direction. The negative electrodes of 1312 and 1313 are connected to serve as the negative electrodes of the first battery string group 131 . The positive and negative electrodes of the three second battery strings 1321, 1322, and 1323 are in the same direction. The positive electrodes of the second battery strings 1321, 1322, and 1323 are connected to serve as the positive electrodes of the second battery string group 132, and the negative electrodes of the second battery strings 1321, 1322, and 1323. Connected as the negative pole of the second battery string 132 . The positive and negative directions of the first battery string group 131 and the second battery string group 132 are opposite in direction.

The six third battery strings 1331, 1332, 1333, 1334, 1335, and 1336 are divided into two groups, the positive and negative directions of the three battery strings in each group are the same, and the positive and negative directions between the two groups of battery strings are opposite. The battery strings are respectively connected in series in pairs, and then connected in parallel. Specifically, the positive and negative directions of the third battery strings 1331, 1332, and 1333 are the same, and the positive and negative directions of the third battery strings 1334, 1335, and 1336 are the same. The positive and negative directions of 1336 are opposite, the third battery strings 1331 and 1336 are connected in series, the third battery strings 1332 and 1335 are connected in series, and the third battery strings 1333 and 1334 are connected in series. The battery strings 1332, 1335 and the third battery strings 1333, 1334 are then connected in parallel. The positive electrodes of the third battery strings 1331 , 1332 and 1333 serve as the positive electrodes of the third battery string group, and the negative electrodes of the third battery strings 1334 , 1335 and 1336 serve as the negative electrodes of the third battery string group.

Further, the negative electrode of the first battery string group 131 and the positive electrode of the second battery string group 132 are located on the same side and connected through the interconnection bar 140 , and the negative electrode of the second battery string group 132 and the positive electrode of the third battery string group 133 are located on the same side and parallel. Connected by interconnection bar 140 .

The photovoltaic assembly 100 also includes lead wires connected to the positive or negative electrodes of the three groups of battery strings. Specifically, the lead wires include a first lead wire 171 connected to the positive electrode of the first battery string 131 , a second lead wire 172 connected to the negative electrode of the first battery string 131 and the positive electrode of the second battery string 132 , The third lead wire 173 connected to the negative electrode of the second battery string group 132 and the positive electrode of the third battery string group 133 and the fourth lead wire 174 connected to the negative electrode of the third battery string group 133 . The first lead wire 171 is the positive output end of the photovoltaic module 100 , and the fourth lead wire 174 is the negative output end of the photovoltaic module 100 .

The bypass diodes include a first bypass diode 181 connected in parallel with the first battery string 131 , a second bypass diode 182 connected in parallel with the second battery string 132 , and a third bypass diode 182 connected in parallel with the third battery string 133 Bypass diode 183. There are no more than 24 battery slices 10 connected in parallel with each bypass diode, that is, the number of battery slices 10 in each first battery string 1311, 1312, 1313 is not more than 24, and each The number of one-third sliced battery slices 10 of the second battery strings 1321 , 1322 and 1323 does not exceed 24, and the sum of the number of one-third sliced battery slices 10 of the third battery string 1331 and the third battery string 1336 No more than 24, and the sum of the number of sliced cells 10 of one-third of the third battery string 1332 and the third battery string 1335 is no more than 24, and one-third of the third battery string 1333 and the third battery string 1334 The sum of the number of each cell 10 is not more than 24. This setting can ensure that the bypass diode can work safely.

In the present invention, the first bypass diode 181, the second bypass diode 182 and the third bypass diode 183 are located inside the junction box (not shown), and the junction box is installed in the middle of the photovoltaic module 100, that is, the first battery string The junction of the group 131 , the second battery string group 132 and the third battery string group 133 . This arrangement facilitates the connection between the junction box and each battery string.

Preferably, the photovoltaic module 100 further includes a bus bar 150 disposed between the first battery string group 131 and the second battery string group 132 . One end of the bus bar 150 is connected to the negative electrode of the first battery string group 131 and the positive electrode of the second battery string group 132 , and the other end is connected to the first lead wire 171 . In this way, the first lead wire 171 and other lead wires are located in the junction box in the middle of the photovoltaic module 100 .

The photovoltaic assembly 100 further includes an insulating bar 161 disposed between the bus bar 150 and the corresponding one-third of the sliced cells 10 to achieve insulation between the one-third of the cell sheets 10 and the bus bar 150 . In addition, an insulating block 162 is provided between the lead-out wire and the corresponding one-third of the sliced battery pieces 10 to achieve insulation between the one-third of the cut-out battery piece 10 and the lead-out wire and each of the lead-out wires. The insulating bars 161 are located between the first battery string group 131 and the second battery string group 132 , and the insulating blocks 162 are located between the lead wires and the corresponding one-third sliced battery sheets 10 . The materials of the insulating strips 161 and the insulating blocks 162 may be pearl cotton or other commonly used insulating materials, which are not limited herein.

Please refer to FIG. 4 , which is an equivalent circuit diagram of the photovoltaic module 100 in FIG. 3 . The internal current direction of the photovoltaic module 100 is as follows when the photovoltaic module 100 works normally: the current direction of the first battery string 1311 , 1312 and 1313 is from left to right, The current direction of the strings 1321, 1322 and 1323 is from right to left, the current direction of the third battery strings 1331, 1332 and 1333 is from right to left, and the current direction of the third battery strings 1334, 1335 and 1336 is from left to right. If one-third of the battery slices in the first battery string 1311, 1312 or 1313 are blocked, the first bypass diode 181 changes from a reverse cut-off to a forward conducting state, and the battery string 1311, 1312 or 1313 has no power output ; If other battery strings are blocked, the corresponding bypass diode situation is the same as above.

To sum up, in the photovoltaic module of the present invention, by welding one third of the cells into a string, the working current inside the photovoltaic module is one third of that of the traditional photovoltaic module, thereby reducing the number of cells inside the photovoltaic module. In addition, by connecting a bypass diode in parallel with each battery string of the photovoltaic module, the photovoltaic module can be effectively protected when the photovoltaic module is shaded and the hot plate effect occurs. components, reducing the operating temperature and the risk of hot spots of the photovoltaic components, and prolonging the service life of the photovoltaic components.

Terms such as "upper," "lower," "left," "right," "front," "rear," etc. used herein to indicate spatially relative positions are for ease of illustration to describe the figures as shown in the accompanying drawings. The relationship of one feature with respect to another feature. It can be understood that, according to different placement positions of products, the terms of relative positions in space may be intended to include different orientations other than those shown in the figures, and should not be construed as limitations on the claims.

In addition, the above embodiments are only used to illustrate the present utility model rather than limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art, although this specification refers to the above-mentioned embodiments to the present utility model. It has been described in detail, however, those skilled in the art should understand that those skilled in the art can still modify or equivalently replace the present invention, and all technical solutions that do not depart from the spirit and scope of the present invention and The improvements thereof should be covered within the scope of the claims of the present utility model.

Claims (10)

1. A photovoltaic module, comprising a front plate, a battery layer and a back plate, characterized in that: the battery layer includes a number of battery strings connected in series and a bypass diode, and each battery string group includes a number of battery strings connected in parallel, Each battery string group is connected in parallel with a bypass diode, and each battery string includes a number of series-connected one-thirds sliced battery slices. 2 . The photovoltaic module according to claim 1 , wherein the battery string group comprises a first battery string group, a second battery string group and a third battery string group connected in series, and the battery string group all have first electrode and second electrode. 3 . The photovoltaic module according to claim 2 , wherein the first electrode of the first battery string is connected with a first lead wire, and the second electrode of the first battery string is connected to the second battery string. 4 . The first electrode of the group is connected with a second lead wire, the second electrode of the second battery string group and the first electrode of the third battery string group are connected with a third lead wire, and the third battery string group is connected with a third lead wire. The first electrode is connected with a fourth lead wire, a first bypass diode is arranged between the first lead wire and the second lead wire, and a bypass diode is arranged between the second lead wire and the third lead wire. A third bypass diode is arranged between the second bypass diode, the third lead wire and the fourth lead wire, so that the bypass diode is connected in parallel with the corresponding battery string. 4 . The photovoltaic module according to claim 3 , wherein the first battery string group comprises three first battery strings connected in parallel, and the second battery string group comprises three second battery strings connected in parallel, 5 . The first battery string and the second battery string are arranged side by side; the third battery string group includes six third battery strings arranged side by side, the six third battery strings are respectively connected with the first battery string group and the second battery string The first battery strings and the second battery strings of the group are arranged in alignment, and the third battery strings are connected in series and then connected in parallel. 5 . The photovoltaic module according to claim 4 , wherein an end connecting the first electrode of the first battery string and the first electrode of the second battery string is arranged between the first battery string group and the second battery string group. 6 . Two-electrode bus bar. 6 . The photovoltaic module of claim 3 , wherein the first electrode is a negative electrode, and the second electrode is a positive electrode. 7 . 7 . The photovoltaic module according to claim 4 , wherein an insulating strip is provided between the one-third sliced cell and the corresponding bus bar. 8 . 8 . The photovoltaic module according to claim 7 , wherein the insulating strip is made of pearl cotton. 9 . 9 . The photovoltaic module according to claim 1 , wherein the number of the third-slice cells connected in parallel with a single bypass diode is not more than 24. 10 . 10 . The photovoltaic module according to claim 6 , wherein the second electrode of the first battery string group is the positive output terminal of the photovoltaic module, and the first electrode of the third battery string group is the The negative output terminal of the photovoltaic module.