CN213340388U - Photovoltaic module - Google Patents

Abstract

The utility model discloses a photovoltaic module, photovoltaic module includes: a plurality of battery unit groups, every battery unit group includes first battery cell and second battery cell, first battery cell includes two first battery strings, two first battery string series connection just arrange the direction along the unit group and arrange, the second battery cell includes two second battery strings, every first battery string and every second battery string all include series connection and arrange a plurality of battery pieces that the direction was arranged along the cluster, every first battery cell's both ends and the both ends of the second battery cell that corresponds all reverse parallel connection have the diode, the length of every battery piece is L, L satisfies: l is more than or equal to 180mm and less than or equal to 220 mm. According to the utility model discloses a photovoltaic module can reduce the electric current requirement to the diode when the size of battery piece is great, can reduce the inefficacy risk of diode, and can reduce whole photovoltaic module's cost. In addition, the light receiving area of the cell can be increased, so that the output power of the photovoltaic module is improved.

Description

Photovoltaic module

Technical Field

The utility model belongs to the technical field of photovoltaic manufacturing technology and specifically relates to a photovoltaic module is related to.

Background

In the related art, a photovoltaic module is generally formed by connecting an upper circuit and a lower circuit in parallel, and the upper circuit and the lower circuit are connected with the same diode in parallel to prevent a hot spot effect. However, when the size of the cell of the photovoltaic module is large, for example, up to 210mm, the current requirement for the diode is high, and the short-circuit current may exceed 18A. When the diode is conducted in the forward direction, the temperature of the diode is increased sharply due to the excessively high current, the failure risk of the diode is increased, and the cost of the whole photovoltaic module is increased due to the high price of the diode with the large current.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a photovoltaic module, which can reduce the failure risk of the diode and reduce the cost.

According to the utility model discloses photovoltaic module, include: a plurality of cell units, each cell unit includes a first cell unit and a second cell unit, the first cell unit and the second cell unit are connected in parallel and are sequentially arranged along the string arrangement direction of the photovoltaic module, the first cell unit includes two first cell strings, the two first cell strings are connected in series and are arranged along the cell group arrangement direction perpendicular to the string arrangement direction, the second cell unit includes two second cell strings, the two second cell strings are connected in series and are arranged along the cell group arrangement direction, each first cell string and each second cell string include a plurality of cell pieces connected in series and arranged along the string arrangement direction, both ends of each first cell unit and both ends of the corresponding second cell unit are reversely connected in parallel with a diode, the length of each cell piece is L, wherein L satisfies: l is more than or equal to 180mm and less than or equal to 220 mm.

According to the utility model discloses photovoltaic module, through making every first battery cell's both ends and the equal reverse parallel connection in both ends of the second battery cell that corresponds have the diode, can reduce the electric current requirement to the diode when the size of battery piece is great, make calorific capacity of diode less to can reduce the inefficacy risk of diode, and can need not to use the diode of heavy current, thereby can reduce whole photovoltaic module's cost. In addition, the length L of each cell satisfies 180mm L220 mm, the light receiving area of the cell can be increased, and the output power of the photovoltaic module is improved.

According to some embodiments of the invention, the L is 210 mm.

According to the utility model discloses a some embodiments, follow the unit group direction of arranging, the outside first battery cluster with second battery cluster parallel connection is in same tie point, just the tie point does photovoltaic module's output.

According to some embodiments of the utility model, every the battery piece is the half of complete battery piece, every the length direction of battery piece does the direction is arranged to the unit group, every the width direction of battery piece does the cluster direction of arranging.

According to some embodiments of the utility model, first battery unit with be equipped with the busbar subassembly between the second battery unit, the busbar subassembly includes a plurality of first busbars and a plurality of second busbar, follows the unit group direction of arranging, adjacent two first battery unit's adjacent two be connected with between the first battery cluster first busbar is followed the unit group direction of arranging, adjacent two second battery unit's adjacent two be connected with between the second battery cluster second busbar, it is a plurality of the diode includes at least one first diode and at least one second diode, first diode is connected adjacent two between the first busbar, the second diode is connected adjacent two between the second busbar.

According to some embodiments of the present invention, the bus bar assembly further includes a third bus bar and a fourth bus bar, one of the two outermost first cell strings and the corresponding second cell string are connected in parallel along the cell group arrangement direction, the other of the two outermost first cell strings and the corresponding second cell string are connected in parallel through the fourth bus bar, ends of the third bus bar and the fourth bus bar, which are away from each other, are a positive output end and a negative output end of the photovoltaic module, respectively, the plurality of diodes further includes third to sixth diodes, the third diode is connected between the third bus bar and the adjacent first bus bar, the fourth diode is connected between the third bus bar and the adjacent second bus bar, the fifth diode is connected between the fourth bus bar and the adjacent first bus bar, and the sixth diode is connected between the fourth bus bar and the adjacent second bus bar.

According to some embodiments of the invention, the photovoltaic module further comprises: and each junction box is arranged between the first battery unit and the corresponding second battery unit, and in the same battery unit group, the diodes at two ends of the first battery unit and the diodes at two ends of the second battery unit are positioned in the same junction box.

According to some embodiments of the present invention, the plurality of terminal boxes include a first terminal box, a second terminal box, and at least one third terminal box, the third terminal box is disposed between the first terminal box and the second terminal box along the unit group arrangement direction, a first pad, a second pad, and a third pad are disposed in the first terminal box, the first pad is connected to the third bus bar, the second pad is connected to the adjacent first bus bar, the third pad is connected to the adjacent second bus bar, the third diode is electrically connected between the first pad and the second pad, the fourth diode is electrically connected between the first pad and the third pad, a fourth pad, a fifth pad, and a sixth pad are disposed in the second terminal box, the fourth pad is connected to the fourth bus bar, the fifth pad is connected with the adjacent first bus bar, the sixth pad is connected with the adjacent second bus bar, the fifth diode is electrically connected between the fourth pad and the fifth pad, the sixth diode is electrically connected between the fourth pad and the sixth pad, a seventh pad, an eighth pad, a ninth pad and a tenth pad are arranged in the third junction box, the seventh pad and the eighth pad are respectively connected with the adjacent first bus bar, the ninth pad and the tenth pad are respectively connected with the adjacent second bus bar, the seventh pad and the eighth pad are electrically connected with the first diode, and the ninth pad and the tenth pad are electrically connected with the second diode.

According to some embodiments of the present invention, the first pad is located on a side of the second pad and the third pad away from the center of the photovoltaic module, the second pad and the third pad are arranged along the string arrangement direction, and the first pad, the second pad and the third pad are located between the third diode and the fourth diode along the string arrangement direction; the fourth pad is located on one side, far away from the center of the photovoltaic module, of the fifth pad and the sixth pad, the fifth pad and the sixth pad are arranged along the string arrangement direction, and the fourth pad, the fifth pad and the sixth pad are located between the fifth diode and the sixth diode along the string arrangement direction; the seventh pad, the eighth pad, the ninth pad and the tenth pad are arranged in an array, the seventh pad and the eighth pad are arranged along the unit group arrangement direction, the ninth pad and the tenth pad are arranged along the unit group arrangement direction, and the seventh pad, the eighth pad, the ninth pad and the tenth pad are arranged between the first diode and the corresponding second diode along the unit group arrangement direction.

According to some embodiments of the invention, the photovoltaic module further comprises: the junction box is arranged between the first battery unit and the corresponding second battery unit, and in the same battery unit group, the diodes at two ends of the first battery unit and the diodes at two ends of the second battery unit are positioned in the same junction box.

According to the utility model discloses a some embodiments, every first battery cluster and every the second battery cluster the number of battery piece is N, wherein N satisfies: n is more than or equal to 2 and less than or equal to 12.

According to some embodiments of the present invention, each of the first battery string, each of the plurality of the battery pieces in the second battery string are located in the same plane or in an end lap joint.

According to the utility model discloses a some embodiments, every first battery cluster and every second battery cluster the number of battery piece equals.

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

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention;

fig. 2 is a schematic layout diagram of a photovoltaic module according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a bus bar assembly according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first junction box according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a second junction box according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a third junction box according to an embodiment of the present invention.

Reference numerals:

100: a photovoltaic module;

1: a battery cell stack; 11: a first battery cell; 111: a first battery string;

1111: a battery piece; 12: a second battery cell; 121: a second battery string;

2: a diode; 21: a first diode; 22: a second diode;

23: a third diode; 24: a fourth diode; 25: a fifth diode;

26: a sixth diode; 3: a first bus bar; 4: a second bus bar;

5: a third bus bar; 6: a fourth bus bar; 7: a first junction box;

71: a first pad; 72: a second pad; 73: a third pad;

8: a second junction box; 81: a fourth pad; 82: a fifth pad;

83: a sixth pad; 9: a third junction box; 91: a seventh pad;

92: an eighth pad; 93: a ninth pad; 94: a tenth pad.

Detailed Description

Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary.

A photovoltaic module 100 according to an embodiment of the present invention is described below with reference to fig. 1-6.

As shown in fig. 1 and 2, according to the embodiment of the present invention, a photovoltaic module 100 includes a plurality of cell units 1, each cell unit 1 includes a first cell unit 11 and a second cell unit 12, the first cell unit 11 and the second cell unit 12 are connected in parallel and are sequentially arranged along a string arrangement direction of the photovoltaic module 100, the first cell unit 11 includes two first cell strings 111, the two first cell strings 111 are connected in series and are arranged along a cell group arrangement direction perpendicular to the string arrangement direction, the second cell unit 12 includes two second cell strings 121, the two second cell strings 121 are connected in series and are arranged along the cell group arrangement direction, each first cell string 111 and each second cell string 121 include a plurality of cell sheets 1111 connected in series and are arranged along the string arrangement direction.

Here, it should be noted that the "string arrangement direction" is a long side direction of the photovoltaic module 100, that is, an arrangement direction (for example, an up-down direction in fig. 1 and 2) of the plurality of cell pieces 1111 in the cell string in fig. 1 and 2, for example, the first cell string 111; the "cell group arrangement direction" is a short side direction of the photovoltaic module 100, that is, a direction perpendicular to the arrangement direction of the plurality of cell pieces 1111 in the cell string such as the first cell string 111 in fig. 1 and 2 (for example, a left-right direction in fig. 1 and 2).

For example, in the example of fig. 1 and 2 showing three cell groups 1, the plurality of cell pieces 1111 in each of the first cell string 111 and the second cell string 121 may extend in a straight line along the long side of the photovoltaic module 100. The upper surfaces of the three cell units 11 of the photovoltaic module 100 may be provided with a cover plate, the lower surfaces may be provided with a back plate, and the edges of the cover plate, the back plate, and the three cell units 1 may be provided with a frame. Alternatively, the cover plate may be glass. Therefore, the circuit of the photovoltaic module 100 is simple in design and convenient to process.

Three cell stacks 1 are shown in fig. 1 and 2 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solutions of the present application that the solution can be applied to other cell stacks 1, which also falls within the protection scope of the present invention.

Referring to fig. 1, both ends of each first battery cell 11 and both ends of the corresponding second battery cell 12 are connected in parallel with a diode 2 in an opposite direction, and each cell 1111 has a length L, where L satisfies: l is more than or equal to 180mm and less than or equal to 220 mm. Therefore, the diodes 2 at the two ends of the first battery unit 11 can protect all the battery slices 1111 in the corresponding first battery unit 11, the bypass function can be realized when the battery slices 1111 in the first battery string 111 are shielded, and the hot spot effect is avoided, the diodes 2 at the two ends of the second battery unit 12 can protect all the battery slices 1111 in the corresponding second battery unit 12, and the bypass function can be realized when the battery slices 1111 in the second battery string 121 are shielded, and the hot spot effect is avoided. Moreover, since each diode 2 only needs to protect the corresponding first battery unit 11 or second battery unit 12, the circuit connection mode set up in this way can be applied to the battery piece 1111 with a larger size, for example, when the length L of the battery piece 1111 is 210mm, compared with the conventional circuit connection mode in which the upper and lower circuits are connected in parallel with the same diode 2, the current requirement for the diode 2 is half (for example, 9A) of the current requirement for the diode 2 in the existing circuit connection mode, so that the temperature of the diode 2 can be prevented from rising sharply, and the failure risk of the diode 2 is greatly reduced. In addition, the diode 2 for large current may not be used, so that the cost of the entire photovoltaic module 100 may be reduced. In addition, because the length of the cell 1111 is large, the light receiving area is large, so that the power of the photovoltaic module 100 can be increased, and the manufacturing cost per watt can be reduced. Of course, the length of the battery piece 1111 may also be other values, such as 180mm, which is not limited by the present invention.

According to the utility model discloses photovoltaic module 100, through the both ends that make every first battery cell 11 and the both ends of the second battery cell 12 that correspond all reverse parallel connection have diode 2, can reduce the electric current requirement to diode 2 when the size of battery piece 1111 is great, make diode 2's calorific capacity less to can reduce diode 2's inefficacy risk, and can need not to use diode 2 of heavy current, thereby can reduce whole photovoltaic module 100's cost. In addition, the length L of each cell 1111 is equal to or less than 180mm and equal to or less than 220mm, so that the light receiving area of the cell 1111 can be increased, and the output power of the photovoltaic module 100 can be improved.

In some embodiments of the present invention, with reference to fig. 1, the first battery string 111 and the second battery string 121 on the outermost side in the unit cell arrangement direction are connected in parallel to the same connection point, and the connection point is the output end of the photovoltaic module 100. For example, in the example of fig. 1, the first cell string 111 and the second cell string 121 located at the leftmost side of the photovoltaic module 100 are connected in parallel to the same connection point, and this connection point is the positive output end of the photovoltaic module 100, and the first cell string 111 and the second cell string 121 located at the rightmost side of the photovoltaic module 100 are connected in parallel to the same connection point, and this connection point is the negative output end of the photovoltaic module 100. With this arrangement, the outermost first cell string 111 and the corresponding second cell string 121 can be connected by one bus bar, so that the use of bus bars can be reduced. Furthermore, the photovoltaic module 100 may have only one positive lead wire and only one negative lead wire, so that the wiring manner of the entire photovoltaic module 100 may be simplified.

In some optional embodiments of the present invention, each cell 1111 may be one-half of the complete cell 1111, the length direction of each cell 1111 is the cell group arrangement direction, and the width direction of each cell 1111 is the string arrangement direction. For example, the half-cell 1111 may be processed by laser scribing.

Therefore, compared with the use of the complete cell 1111, the internal loss of the photovoltaic module 100 can be reduced, and by adopting the circuit connection mode, the current of each cell string, such as the first cell string 111 and the second cell string 121, is reduced to one half of the output current of the complete cell 1111, and then the first cell unit 11 and the second cell unit 12 are connected in parallel, so that the output current of the photovoltaic module 100 is still the same as the output current when the complete cell 1111 is adopted, the voltage reduction caused by the adoption of the half cell 1111 is avoided, and meanwhile, the internal loss can be reduced due to the current of the half cell 1111, so that the output power of the photovoltaic module 100 is improved, and the reduction of the cost of a single watt is facilitated.

Of course, those skilled in the art will understand that the battery slice 1111 is not limited to being one-half of the complete battery slice 1111, for example, the battery slice 1111 may also be one-third or one-fourth of the complete battery slice 1111, etc.

In some embodiments of the present invention, as shown in fig. 1 to 3, a bus bar assembly is disposed between the first battery unit 11 and the second battery unit 12, the bus bar assembly includes a plurality of first bus bars 3 and a plurality of second bus bars 4, the first bus bar 3 is connected between two adjacent first battery strings 111 of two adjacent first battery units 11 along the unit group arrangement direction, the second bus bar 4 is connected between two adjacent second battery strings 121 of two adjacent second battery units 12 along the unit group arrangement direction, the plurality of diodes 2 include at least one first diode 21 and at least one second diode 22, the first diode 21 is connected between two adjacent first bus bars 3, and the second diode 22 is connected between two adjacent second bus bars 4.

For example, in the example of fig. 1 to 3, the photovoltaic module 100 includes three cell groups 1, the three cell groups 1 are connected in series and arranged in sequence along the cell group arrangement direction, the bus bar assembly includes two first bus bars 3 and two second bus bars 4, each first bus bar 3 and each second bus bar 4 are in one-to-one correspondence in the series arrangement direction, a first diode 21 is connected between the two first bus bars 3, and a second diode 22 is connected between the two second bus bars 4. Thus, by providing the above-described first bus bar 3 and second bus bar 4, the first bus bar 3 can realize the series connection between two adjacent first battery cells 11, and the second bus bar 4 can realize the series connection between two adjacent second battery cells 12. Moreover, by arranging the first diode 21 and the second diode 22, the first diode 21 can realize the bypass function when the cell 1111 in the corresponding first cell string 111 is shielded, so that the hot spot effect is avoided, the second diode 22 can realize the bypass function when the cell 1111 in the corresponding second cell string 121 is shielded, so that the hot spot effect is avoided, and the circuit design is simple and convenient to process.

In a further embodiment of the present invention, referring to fig. 1 to 3, the bus bar assembly further includes a third bus bar 5 and a fourth bus bar 6, one of the two outermost first battery strings 111 and the corresponding second battery string 121 are connected in parallel by the third bus bar 5, the other of the two outermost first battery strings 111 and the corresponding second battery string 121 are connected in parallel by the fourth bus bar 6, ends of the third bus bar 5 and the fourth bus bar 6, which are away from each other, are a positive output end and a negative output end of the photovoltaic module 100, respectively, the plurality of diodes 2 further includes third to sixth diodes 23 to 26, the third diode 23 is connected between the third bus bar 5 and the adjacent first bus bar 3, the fourth diode 24 is connected between the third bus bar 5 and the adjacent second bus bar 4, the fifth diode 25 is connected between the fourth bus bar 6 and the adjacent first bus bar 3, and the sixth diode 26 is connected between the fourth bus bar 6 and the adjacent second bus bar 4.

For example, in the example of fig. 1 to 3, a third bus bar 5 is connected between the leftmost first battery string 111 and the corresponding second battery string 121, a third diode 23 is connected between the third bus bar 5 and the left first bus bar 3, and a fourth diode 24 is connected between the third bus bar 5 and the left second bus bar 4. A fourth bus bar 6 is connected between the rightmost first cell string 111 and the corresponding second cell string 121, a fifth diode 25 is connected between the fourth bus bar 6 and the right first bus bar 3, and a sixth diode 26 is connected between the fourth bus bar 6 and the right second bus bar 4. Thus, by providing the third bus bar 5 and the fourth bus bar 6, the outermost first cell string 111 and the corresponding second cell string 121 can be connected in parallel only by the corresponding third bus bar 5 or fourth bus bar 6, and the number of bus bars used can be effectively reduced. Moreover, by making the ends of the third bus bar 5 and the fourth bus bar 6, which are away from each other, the positive output end and the negative output end of the photovoltaic module 100, the wiring manner of the photovoltaic module 100 can be simplified. In addition, the third to sixth diodes 23 to 26 can implement a bypass function when the battery piece 1111 of the corresponding battery unit is shielded, thereby avoiding the hot spot effect.

In a further embodiment of the present invention, the photovoltaic module 100 further comprises at least one junction box. Specifically, the junction box is provided between a first battery cell 11 and a corresponding second battery cell 12, and in the same cell group 1, the diodes 2 at both ends of the first battery cell 11 and the diodes 2 at both ends of the second battery cell 12 are located in the same junction box. For example, three cell stacks 1 are shown in fig. 1 and 2, in which case, three junction boxes may be provided, and the three junction boxes may be disposed on the back plate at intervals along the cell stack arrangement direction. The junction box at the leftmost side can be internally provided with an anode output end and two diodes 2 corresponding to the battery cell group 1 at the leftmost side, the junction box at the rightmost side can be internally provided with a cathode output end and two diodes 2 corresponding to the battery cell group 1 at the rightmost side, and the junction box at the middle part is internally provided with two diodes 2 corresponding to the battery cell group 1 at the middle part.

Therefore, the junction box is arranged as a split junction box, so that the number of cables can be reduced, and the junction temperature can be reduced. Furthermore, with this arrangement, the first battery cell 11 and the corresponding second battery cell 12 can share one junction box, and the positive terminal and the negative terminal of the first battery cell 11 and the positive terminal and the negative terminal of the second battery cell 12 can be respectively connected to the positive electrode and the negative electrode of the diode 2 in the corresponding junction box in close proximity, so that the wiring manner can be further simplified.

In some embodiments of the present invention, as shown in fig. 4 to 6, the plurality of terminal boxes include a first terminal box 7, a second terminal box 8, and at least one third terminal box 9, the third terminal box 9 is disposed between the first terminal box 7 and the second terminal box 8 along the unit group arrangement direction, a first pad 71, a second pad 72, and a third pad 73 are disposed in the first terminal box 7, the first pad 71 is connected to the third bus bar 5, the second pad 72 is connected to the adjacent first bus bar 3, the third pad 73 is connected to the adjacent second bus bar 4, the third diode 23 is electrically connected between the first pad 71 and the second pad 72, and the fourth diode 24 is electrically connected between the first pad 71 and the third pad 73. Thus, by providing the first pad 71, the second pad 72, and the third pad 73, the third bus bar 5 can be electrically connected to the adjacent first bus bar 3 and second bus bar 4, and the third diode 23 and the fourth diode 24 can be electrically connected to each other, and the first pad 71, the second pad 72, and the third pad 73 are simple in structure and easy to implement.

With reference to fig. 5, a fourth pad 81, a fifth pad 82 and a sixth pad 83 are disposed in the second junction box 8, the fourth pad 81 is connected to the fourth bus bar 6, the fifth pad 82 is connected to the adjacent first bus bar 3, the sixth pad 83 is connected to the adjacent second bus bar 4, a fifth diode 25 is electrically connected between the fourth pad 81 and the fifth pad 82, and a sixth diode 26 is electrically connected between the fourth pad 81 and the sixth pad 83. Therefore, the fourth pad 81, the fifth pad 82, and the sixth pad 83 described above can achieve electrical connection between the fourth bus bar 6 and the adjacent first bus bar 3 and between the fourth bus bar 6 and the adjacent second bus bar 4, and can achieve electrical connection between the fifth diode 25 and the sixth diode 26, and the fourth pad 81, the fifth pad 82, and the sixth pad 83 are also simple in structure and easy to implement.

Referring to fig. 6, a seventh pad 91, an eighth pad 92, a ninth pad 93 and a tenth pad 94 are disposed in the third junction box 9, the seventh pad 91 and the eighth pad 92 are respectively connected to the adjacent first bus bars 3, the ninth pad 93 and the tenth pad 94 are respectively connected to the adjacent second bus bars 4, the first diode 21 is electrically connected between the seventh pad 91 and the eighth pad 92, and the second diode 22 is electrically connected between the ninth pad 93 and the tenth pad 94. With such a configuration, the seventh pad 91 and the eighth pad 92 can achieve series connection between two adjacent first bus bars 3, the ninth pad 93 and the tenth pad 94 can achieve series connection between two adjacent second bus bars 4, and the seventh pad 91, the eighth pad 92, the ninth pad 93 and the tenth pad 94 can achieve electrical connection between the first diode 21 and the corresponding second diode 22, which is simple in structure and convenient to arrange.

In some embodiments of the present invention, referring to fig. 4-6, the first pad 71 is located on one side of the second pad 72 and the third pad 73 away from the center of the photovoltaic module 100, the second pad 72 and the third pad 73 are arranged along the string arrangement direction, and the first pad 71, the second pad 72, and the third pad 73 are located between the third diode 23 and the fourth diode 24 along the string arrangement direction. In this way, the third diode 23 and the fourth diode 24 may be located at both ends of the first junction box 7 in the string arrangement direction, so that the distance between the third diode 23 and the fourth diode 24 is long, and the heat generation sources of the third diode 23 and the fourth diode 24 may be separated, thereby reducing the junction temperature. Also, the third diode 23 may be disposed adjacent to the corresponding first cell string 111, and the fourth diode 24 may be disposed adjacent to the corresponding second cell string 121, thereby facilitating wire connection, making the overall wiring of the photovoltaic module 100 simpler.

As shown in fig. 5, the fourth pad 81 is located on a side of the fifth pad 82 and the sixth pad 83 away from the center of the photovoltaic module 100, the fifth pad 82 and the sixth pad 83 are arranged in the string arrangement direction, and the fourth pad 81, the fifth pad 82, and the sixth pad 83 are located between the fifth diode 25 and the sixth diode 26 in the string arrangement direction. Thus, the fifth diode 25 and the sixth diode 26 may be located at both ends of the second junction box 8 in the string arrangement direction, so that the distance between the fifth diode 25 and the sixth diode 26 is relatively long, and the heat generation sources of the fifth diode 25 and the sixth diode 26 may be separated to reduce the junction temperature. Also, the fifth diode 25 may be disposed adjacent to the corresponding first cell string 111, and the sixth diode 26 may be disposed adjacent to the corresponding second cell string 121, thereby facilitating wire connection, making the overall wiring of the photovoltaic module 100 simpler.

Referring to fig. 6, the seventh, eighth, ninth, and tenth pads 91, 92, 93, and 94 are arranged in an array, and the seventh and eighth pads 91 and 92 are arranged in the cell group arrangement direction, the ninth and tenth pads 93 and 94 are arranged in the cell group arrangement direction, and the seventh, eighth, ninth, and tenth pads 91, 92, 93, and 94 are located between the first diode 21 and the corresponding second diode 22 in the string arrangement direction. With this arrangement, the first diodes 21 and the corresponding second diodes 22 may be located at two ends of the third junction box 9 in the serial arrangement direction, so that the first diodes 21 and the corresponding second diodes 22 are farther apart, the heat sources of the first diodes 21 and the corresponding second diodes 22 may be separated, and the junction temperature may be reduced. Also, the first diodes 21 may be disposed adjacent to the corresponding first cell strings 111, and the second diodes 22 may be disposed adjacent to the corresponding second cell strings 121, thereby facilitating wire connection, making the overall wiring of the photovoltaic module 100 simpler. In addition, the seventh pad 91, the eighth pad 92, the ninth pad 93 and the tenth pad 94 are arranged in a simple manner and are convenient to arrange.

In some embodiments of the present invention, the number of the battery slices 1111 of each first battery string 111 and each second battery string 121 is N, where N satisfies: n is more than or equal to 2 and less than or equal to 12. Here, the "battery string" refers to the first battery string 111 and the second battery string 121 described above. For example, in the example of fig. 1, the number of the battery slices 1111 in each of the first battery string 111 and the second battery string 121 is equal to twelve, and the number of the battery slices 1111 protected in parallel by each of the diodes 2 is twenty-four. Specifically, when n < 2, the number of the battery pieces 1111 in each battery string is too small, which may cause the output power of the photovoltaic module 100 to be too low; moreover, since the conventional diode 2 is limited by the reverse withstand voltage capability, the number of battery slices 1111 that can be protected at most cannot exceed twenty-four, and the number of battery slices 1111 in each battery string needs to be matched according to the diode 2, therefore, when n > 24, the number of battery slices 1111 in each battery string is too large, the voltage of the diode 2 is high, and the diode 2 has a breakdown risk, so that the number n of battery slices 1111 in each battery string satisfies: n is more than or equal to 2 and less than or equal to 12, so that the photovoltaic module 100 has higher output power, the safety of the diode 2 can be ensured, and the hot spot effect can be reduced.

Alternatively, in conjunction with fig. 2, the plurality of battery slices 1111 in each first battery string 111 and each second battery string 121 may be located in the same plane. With such a configuration, the photovoltaic module 100 is a photovoltaic module 100 in a tile manner, and compared with the conventional photovoltaic module 100, the short side size of the photovoltaic module 100 can be reduced, and when the size of the cell 1111 is larger, for example, 210mm, the difficulty of glass manufacturing process can be reduced, and the risk of frame falling of the photovoltaic module 100 under load can be reduced.

Of course, the present invention is not limited thereto, and the plurality of battery pieces 1111 in each of the first battery string 111 and the second battery string 121 may also be connected in an end lap joint (not shown). For example, the ends of two adjacent battery sheets 1111 in each first battery string 111 and each second battery string 121 may be connected by a conductive adhesive. Therefore, more battery slices 1111 can be stacked in a unit area, and the generating power and the stability of the photovoltaic module 100 are improved. Also, so disposed, the size of the photovoltaic module 100 can be further reduced.

Alternatively, the photovoltaic module 100 may include a front transparent plate, a front encapsulant film, a solar cell module, a back encapsulant film, and a back cover plate. The solar cell module includes a plurality of cells 1111. When the photovoltaic module 100 is manufactured, the front transparent plate, the front encapsulation adhesive film, the solar cell module, the back encapsulation adhesive film and the back cover plate are sequentially placed to complete preparation work before lamination of the photovoltaic module 100. And then, after the laminated five-layer structure comprising the front transparent plate, the front packaging adhesive film, the solar cell module, the back packaging adhesive film and the back cover plate is vacuumized and heated for lamination, the front packaging adhesive film and the back packaging adhesive film are crosslinked and cured to protect the solar cell module, finally, the firm bonding of the five-layer structure (namely the front transparent plate, the front packaging adhesive film, the solar cell module, the back packaging adhesive film and the back cover plate) is realized, and the photovoltaic module 100 is manufactured by additionally installing an aluminum alloy frame, a junction box and sealing by adopting silica gel.

Other constructions and operations of the photovoltaic module 100 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and 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.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" 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 present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (12)

1. A photovoltaic module, comprising:

a plurality of cell stacks, each of the cell stacks including a first cell and a second cell, the first cell and the second cell being connected in parallel and arranged in sequence along a string arrangement direction of the photovoltaic module, the first cell including two first cell strings, the two first cell strings being connected in series and arranged along a cell group arrangement direction perpendicular to the string arrangement direction, the second cell including two second cell strings, the two second cell strings being connected in series and arranged along the cell group arrangement direction, each of the first cell strings and each of the second cell strings including a plurality of cells connected in series and arranged along the string arrangement direction,

each diode is reversely connected in parallel at the two ends of the first battery unit and the two ends of the corresponding second battery unit, and each battery piece is L in length, wherein L satisfies the following conditions: l is more than or equal to 180mm and less than or equal to 220 mm.

2. The photovoltaic module of claim 1, wherein the L is 210 mm.

3. The photovoltaic module according to claim 1, wherein the first cell string and the second cell string on the outermost sides in the arrangement direction of the cell group are connected in parallel to a same connection point, and the connection point is an output end of the photovoltaic module.

4. The photovoltaic module according to claim 1, wherein each of the cells is one half of a complete cell, the length direction of each of the cells is the cell group arrangement direction, and the width direction of each of the cells is the string arrangement direction.

5. The photovoltaic module according to any one of claims 1 to 4, wherein a bus bar assembly is provided between the first cell unit and the second cell unit, the bus bar assembly including a plurality of first bus bars and a plurality of second bus bars, the first bus bars being connected between adjacent two of the first cell strings of adjacent two of the first cell units in the cell group arrangement direction, the second bus bars being connected between adjacent two of the second cell strings of adjacent two of the second cell units in the cell group arrangement direction,

the plurality of diodes includes at least one first diode connected between adjacent two of the first bus bars and at least one second diode connected between adjacent two of the second bus bars.

6. The photovoltaic module according to claim 5, wherein the bus bar module further includes a third bus bar and a fourth bus bar, one of the outermost two first cell strings and the corresponding second cell string are connected in parallel by the third bus bar, the other of the outermost two first cell strings and the corresponding second cell string are connected in parallel by the fourth bus bar, ends of the third bus bar and the fourth bus bar, which are away from each other, are a positive output end and a negative output end of the photovoltaic module, respectively,

the plurality of diodes further includes third to sixth diodes, the third diode being connected between the third bus bar and the adjacent first bus bar, the fourth diode being connected between the third bus bar and the adjacent second bus bar, the fifth diode being connected between the fourth bus bar and the adjacent first bus bar, the sixth diode being connected between the fourth bus bar and the adjacent second bus bar.

7. The photovoltaic module of claim 6, further comprising:

and each junction box is arranged between the first battery unit and the corresponding second battery unit, and in the same battery unit group, the diodes at two ends of the first battery unit and the diodes at two ends of the second battery unit are positioned in the same junction box.

8. The photovoltaic module according to claim 7, wherein the plurality of junction boxes includes a first junction box, a second junction box, and at least one third junction box, the third junction box is disposed between the first junction box and the second junction box along the arrangement direction of the cell groups, the first junction box is disposed with a first pad, a second pad, and a third pad,

the first pad is connected with the third bus bar, the second pad is connected with the adjacent first bus bar, the third pad is connected with the adjacent second bus bar, the third diode is electrically connected between the first pad and the second pad, and the fourth diode is electrically connected between the first pad and the third pad,

a fourth bonding pad, a fifth bonding pad and a sixth bonding pad are arranged in the second junction box, the fourth bonding pad is connected with the fourth bus bar, the fifth bonding pad is connected with the adjacent first bus bar, the sixth bonding pad is connected with the adjacent second bus bar, the fifth diode is electrically connected between the fourth bonding pad and the fifth bonding pad, the sixth diode is electrically connected between the fourth bonding pad and the sixth bonding pad,

a seventh bonding pad, an eighth bonding pad, a ninth bonding pad and a tenth bonding pad are arranged in the third junction box, the seventh bonding pad and the eighth bonding pad are respectively connected with the adjacent first bus bars, the ninth bonding pad and the tenth bonding pad are respectively connected with the adjacent second bus bars, the seventh bonding pad and the eighth bonding pad are electrically connected with the first diode, and the ninth bonding pad and the tenth bonding pad are electrically connected with the second diode.

9. The photovoltaic module of claim 8, wherein the first pad is located on a side of the second and third pads away from a center of the photovoltaic module, the second and third pads being arranged along the string arrangement direction, the first, second, and third pads being located between the third and fourth diodes along the string arrangement direction;

the fourth pad is located on one side, far away from the center of the photovoltaic module, of the fifth pad and the sixth pad, the fifth pad and the sixth pad are arranged along the string arrangement direction, and the fourth pad, the fifth pad and the sixth pad are located between the fifth diode and the sixth diode along the string arrangement direction;

the seventh pad, the eighth pad, the ninth pad and the tenth pad are arranged in an array, the seventh pad and the eighth pad are arranged along the unit group arrangement direction, the ninth pad and the tenth pad are arranged along the unit group arrangement direction, and the seventh pad, the eighth pad, the ninth pad and the tenth pad are arranged between the first diode and the corresponding second diode along the unit group arrangement direction.

10. The photovoltaic module according to any one of claims 1 to 4, wherein the number of the cell pieces of each of the first cell string and the second cell string is N, wherein N satisfies: n is more than or equal to 2 and less than or equal to 12.

11. The assembly defined in any one of claims 1 to 4 wherein the plurality of cells in each of the first and second strings are in the same plane or are connected by end lap joints.

12. The photovoltaic module according to any one of claims 1 to 4, wherein the number of the cell pieces of each of the first cell string and the second cell string is equal.

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