CN214505515U

CN214505515U - Photovoltaic module

Info

Publication number: CN214505515U
Application number: CN202120527970.2U
Authority: CN
Inventors: 邓士锋; 许涛
Original assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc; CSI Solar Technologies Inc
Priority date: 2021-02-02
Filing date: 2021-03-12
Publication date: 2021-10-26
Anticipated expiration: 2031-03-12
Also published as: CN114927592A

Abstract

The utility model discloses a photovoltaic module, photovoltaic module includes: at least one first battery cell group, first battery cell group includes a plurality of first battery cell, a plurality of first battery cell parallel connection and arrange in proper order along photovoltaic module's cluster direction of arranging, every first battery cell includes a plurality of first battery strings, a plurality of first battery strings series connection and arrange along the group direction of arranging with the cluster direction of arranging vertically, every first battery string includes series connection and arranges along the cluster direction of arranging a plurality of first electricity of arrangingThe length of each first battery piece is L₁Wherein L is₁Satisfies the following conditions: l is more than or equal to 182mm₁Less than or equal to 240 mm; at least one first MOS switch connected in anti-parallel with each of the plurality of first battery cells of the first battery cell group. According to the utility model discloses a photovoltaic module can improve photovoltaic module's output, reduce cost, and first MOS switch can reduce forward voltage drop and reverse leakage current, improves photovoltaic module's reliability.

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

With the development of photovoltaic technology, users have higher and higher power requirements on photovoltaic modules, and the photovoltaic modules have larger and larger sizes. In the related art, the maximum size of the battery piece has been changed from the conventional maximum side length of 157mm to the maximum side length of 210 mm. However, the bypass diode of the conventional photovoltaic module is a schottky diode, and the increase in the size of the cell slice causes a large forward voltage drop and a large reverse leakage current of the bypass diode, thereby affecting the reliability of the photovoltaic module.

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 has a higher reliability while having a larger output power.

According to the utility model discloses photovoltaic module, include: at least one first cell stack including a plurality of first battery cells, a plurality of second battery cells, and a plurality of battery cellsFirst battery unit parallel connection just follows photovoltaic module's cluster direction of arranging is arranged in proper order, every first battery unit includes a plurality of first battery cluster, and is a plurality of first battery cluster series connection just follow with the cluster direction of arranging vertically unit group is arranged, every first battery cluster includes series connection and follows a plurality of first battery pieces that the direction was arranged are arranged to the cluster, every the length of first battery piece is L₁Wherein, said L₁Satisfies the following conditions: l is more than or equal to 182mm₁Less than or equal to 240 mm; at least one first MOS switch connected in anti-parallel with each of the plurality of first battery cells of the first battery cell group.

According to the utility model discloses photovoltaic module is through setting up at least one first MOS switch to make first MOS switch and a plurality of first battery cell group all reverse parallel connection and the length L of every first battery piece₁L is more than or equal to 182mm₁The thickness is less than or equal to 240mm, on one hand, the output power of the photovoltaic module can be improved, and the cost is reduced; on the other hand, the first MOS switch can effectively reduce forward voltage drop and reverse leakage current, so that the reliability of the photovoltaic module is improved.

According to some embodiments of the invention, the first MOS switch has an on-state and an off-state, the on-state including a first on-state and a second on-state, the first MOS switch being configured such that a voltage in the first on-state is less than a voltage in the second on-state of the first MOS switch.

According to some embodiments of the invention, the first MOS switch is laminated within the photovoltaic module.

According to some embodiments of the invention, the photovoltaic module further comprises: the first MOS switch is arranged in the junction box.

According to some embodiments of the present invention, there are three first battery cell groups, three first battery cell groups are sequentially arranged along the cell group arrangement direction, and each first battery cell group includes two first battery cells; the number of the junction boxes is three, each junction box is respectively located between two first battery units of the corresponding first battery unit group, and at least one first MOS switch is arranged in each junction box.

According to some embodiments of the utility model, follow direction, two are arranged to the cluster be equipped with central busbar between the first battery cell, central busbar follows the direction extension is arranged to the cell unit.

According to some embodiments of the present invention, the photovoltaic module further comprises: the second battery unit group, the second battery unit group with first battery unit group series connection, just the second battery unit group with first battery unit group follows the direction is arranged to the unit group, the second battery unit group includes a plurality of second battery cells, and is a plurality of second battery cell parallel connection just follows photovoltaic module's cluster direction of arranging is arranged in proper order, every the second battery cell includes a second battery cluster, the second battery cluster includes series connection and follows a plurality of second battery pieces that the direction was arranged are arranged to the cluster, every the second battery cell the quantity of second battery piece is every first battery cell half of the quantity of first battery piece.

According to some embodiments of the utility model, the second battery cell group includes two the second battery cell, two the second battery cluster is first substring and second substring respectively keeping away from of first substring the one end of second substring with keeping away from of second substring be connected with the lead wire busbar between the one end of first substring, the lead wire busbar with the center busbar electricity is connected, just the lead wire busbar is followed the string direction of arranging extends.

According to some embodiments of the present invention, the lead bus bar includes a first sub lead bus bar and a second sub lead bus bar, one end of the first sub lead bus bar is connected with the center bus bar and the other end is connected with the first substring is kept away from one end of the center bus bar is connected, one end of the second sub lead bus bar is connected with the first sub lead bus bar and the other end is connected with the second substring is kept away from one end of the center bus bar is connected.

According to some embodiments of the present invention, the second battery string is electrically connected to the first connection point, the lead bus bar is electrically connected to the second connection point, and the photovoltaic module further includes a second MOS switch, the second MOS switch being connected in reverse parallel between the first connection point and the second connection point.

According to some embodiments of the present invention, along the cluster direction of arranging center busbar is located photovoltaic module's middle part, center busbar includes two first edge busbar sections and at least one first middle part busbar section, first middle part busbar section is located two between the first edge busbar section, two one of them in the first edge busbar section and the neighbouring of first battery cell group the photovoltaic module edge first battery cluster links to each other, and the other end draws forth the end for the negative pole, two another one in the first edge busbar section one end with the lead wire busbar links to each other, and the other end draws forth the end for the positive pole, first middle part busbar section is connected adjacent two between the first battery cell group in order to realize adjacent two the series connection of first battery cell group, or adjacent first battery cell group with between the second battery cell group in order to realize adjacent first battery cell group The cell unit group and the second cell unit group are connected in series.

According to some embodiments of the present invention, the width of the photovoltaic module is W, wherein W satisfies: w is more than or equal to 1040mm and less than or equal to 1450 mm.

According to some embodiments of the utility model, follow the cluster direction of arranging center busbar is located photovoltaic module's middle part, center busbar includes two second edge busbar sections and at least one second middle part busbar section, second middle part busbar section is located two between the second edge busbar section, every the one end of second edge busbar section and the outside that corresponds are close to of first battery cell group photovoltaic module edge first battery cluster links to each other, and the other end is for drawing forth the end, second middle part busbar section is connected adjacent two in order to realize adjacent two between the first battery cell group the series connection of first battery cell group.

According to some embodiments of the invention, the width of the central bus bar is 5mm ~ 6 mm.

According to some embodiments of the utility model, photovoltaic module's the back is equipped with at least one horizontal pole, the horizontal pole is followed the direction of arranging of unit group extends, and the horizontal pole is close to central busbar sets up.

According to the utility model discloses a some embodiments, every the first battery unit the number of first battery piece is N, wherein N satisfies: n is more than or equal to 16 and less than or equal to 32.

According to some embodiments of the present invention, each of the first battery strings is adjacent to two of the first battery pieces, and the minimum distance between the first battery pieces is L₂Wherein, said L₂Satisfies the following conditions: l is not more than 0.6mm₂≤1mm。

According to some embodiments of the invention, the first battery unit is arranged in a row along the direction of arrangement of the strings, adjacent two, the minimum distance of the first battery unit is L₃Wherein, said L₃Satisfies the following conditions: l is more than or equal to 10mm₃≤26mm。

According to the utility model discloses a some embodiments, every the area ratio of first battery piece and complete battery piece is S, wherein, S satisfies: 1/6 is less than or equal to S is less than or equal to 1/2.

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

According to some embodiments of the invention, the first MOS switch has an on-state and an off-state, the on-state includes a first on-state and a second on-state, the first MOS switch is configured such that the voltage in the first on-state is less than the voltage in the second on-state, the first MOS switch is configured such that the duration in the first on-state is greater than the duration in the second on-state.

According to some embodiments of the invention, the first MOS switch has an on-state and an off-state, the on-state includes a first on-state and a second on-state, the first MOS switch is configured such that a voltage in the first on-state is less than a voltage in the second on-state, the first MOS switch is in the on-state, the first on-state and the second on-state are periodically distributed.

According to some embodiments of the present invention, the first cell group includes two the first cell unit, follow the cluster direction of arranging the first MOS switch is located two between the first cell unit, first MOS switch includes first pin, second pin and third pin, first pin and two the one end electricity of one of them among the first cell unit is connected, the second pin is connected with two the one end electricity of another among the first cell unit is connected, the third pin is connected with two the equal electricity of the other end of first cell unit is connected.

According to some embodiments of the utility model, the first pin with the second pin does the positive pole of MOS switch, the first pin with the second pin all with photovoltaic module's negative pole output links to each other, the third pin does the negative pole of MOS switch, the third pin with photovoltaic module's positive pole output links to each other.

According to some embodiments of the invention, the first MOS switch further comprises a fourth pin, the fourth pin being grounded.

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 structural diagram of a MOS switch of a photovoltaic module according to an embodiment of the present invention;

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

fig. 3 is a functional block diagram of a MOS switch of a photovoltaic module according to an embodiment of the present invention;

fig. 4 is a diagram of a forward operating voltage waveform of a MOS switch of a photovoltaic module according to an embodiment of the present invention;

fig. 5 is a schematic diagram comparing junction temperature tests of a MOS switch according to an embodiment of the present invention and a prior art diode;

fig. 6 is a schematic diagram comparing thermal breakdown testing of a MOS switch according to an embodiment of the present invention with a prior art diode;

fig. 7 is a schematic front structural view of a photovoltaic module according to an embodiment of the present invention;

fig. 8 is a schematic view of a back structure of a photovoltaic module according to an embodiment of the present invention;

fig. 9 is a schematic view of a back side structure of a photovoltaic module according to another embodiment of the present invention;

fig. 10 is a schematic circuit diagram of a photovoltaic module according to an embodiment of the present invention;

FIG. 10a is an enlarged partial view of the photovoltaic module shown in FIG. 10;

fig. 11 is a schematic circuit diagram of a photovoltaic module according to another embodiment of the present invention;

fig. 11a is a partial enlarged view of the photovoltaic module shown in fig. 11.

Reference numerals:

100: a photovoltaic module;

1: a first cell group; 11: a first battery cell; 111: a first battery string; 1111: a first cell piece;

2: a first MOS switch; 21: a first pin; 22: a second pin; 23: a third pin;

25: a first diode; 26: a second diode; 27: a charge pump; 28: a capacitor; 29: a reference comparator;

3: a junction box; 4: a second cell group; 41: a second battery string; 411: a second cell piece;

5: a center bus bar; 51: a first edge bus bar segment; 52: a first middle bus bar section;

53: a second edge bus segment; 54: a second middle bus bar section;

6: a lead bus bar; 61: a first sub-lead bus bar; 62: a second sub-lead bus bar;

7: a second MOS switch; 8: a back plate; 81: a cross bar.

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. 1-11 a.

As shown in fig. 10 and 11, a photovoltaic module 100 according to an embodiment of the present invention includes at least one first cell group 1 and at least one first MOS switch 2. Wherein, MOS is the abbreviation of Metal-Oxide-Semiconductor, and refers to Metal-Oxide-Semiconductor.

The first cell unit group 1 includes a plurality of first cell units 11, the plurality of first cell units 11 are connected in parallel and are sequentially arranged along a string arrangement direction of the photovoltaic module 100, each first cell unit 11 includes a plurality of first cell strings 111, the plurality of first cell strings 111 are connected in series and are arranged along a cell group arrangement direction perpendicular to the string arrangement direction, each first cell string 111 includes a plurality of first cell sheets 1111 connected in series and arranged along the string arrangement direction, and the length of each first cell sheet 1111 is L₁Wherein L is₁Satisfies the following conditions: l is more than or equal to 182mm₁Less than or equal to 240 mm. In the description of the present invention, "a plurality" means two or more.

Here, it should be noted that the "string arrangement direction" may be understood as an arrangement direction of the plurality of first cells 1111 in the first cell string 111 (e.g., an up-down direction in fig. 10 and 11), and the "cell group arrangement direction" may be a direction perpendicular to the arrangement direction of the plurality of first cells 1111 in the first cell string 111 (e.g., a left-right direction in fig. 10 and 11).

For example, three first cell group 1 are shown in the example of fig. 10, the three first cell group 1 being arranged in sequence along the short side (i.e., the cell group arrangement direction) of the photovoltaic module 100, each first cell group 1 including two first cells 11 connected in parallel and arranged along the long side of the photovoltaic module 100. Each first battery unit 11 includes two first battery strings 111 connected in series and arranged along a short side of the photovoltaic module 100, and the plurality of first battery pieces 1111 in each first battery string 111 may linearly extend along a long side of the photovoltaic module 100. Therefore, the circuit of the photovoltaic module 100 is simple in design and convenient to process. And, by making L₁Satisfies the following conditions: l is more than or equal to 182mm₁240mm, the length of every first battery piece 1111 is great to make the photic area of first battery piece 1111 great, thereby can improve whole photovoltaic module 100's output, reduce cost.

Three first cell stacks 1 are shown in fig. 10 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 numbers of first cell stacks 1, which also falls within the protection scope of the present invention.

The first MOS switch 2 is connected in inverse parallel to each of the plurality of first battery cells 11 of the first battery cell group 1. For example, in the example of fig. 10, the first MOS switch 2 may be located between two first battery cells 11 in the string arrangement direction. With reference to fig. 5 and 6, in a test of 30A with current for 1 hour, the junction temperature of the diode is 144 ℃, and the junction temperature of the MOS switch is 134 ℃; after the current was applied for 1 hour, the switching temperature of the diode was 129.8 ℃, the leakage current of the diode at the time of switching was 0.012A, the switching temperature of the MOS switch was 119 ℃, and the leakage current of the MOS switch at the time of switching was 0.006A.

Therefore, by arranging the first MOS switch 2, the first MOS switch 2 can protect all the first battery slices 1111 in the first battery cell group 1, and when the first battery slices 1111 in the first battery cell group 1 are shielded, a bypass function can be effectively realized, thereby avoiding a hot spot effect. Moreover, when the size of the first cell 1111 is large, the photovoltaic module 100 can have large power, and meanwhile, the forward voltage drop and the reverse leakage current can be reduced, so that serious heat generation is avoided, and the reliability of the photovoltaic module 100 can be effectively improved.

According to the utility model discloses photovoltaic module 100 is through setting up at least one first MOS switch 2 to make first MOS switch 2 and a plurality of first battery cell 11 of first battery cell group 1 all reverse parallelly connected and the length L of every first battery piece 1111₁L is more than or equal to 182mm₁Less than or equal to 240mm, on one hand, the output power of the photovoltaic module 100 can be improved, and the cost is reduced; on the other hand, the first MOS switch 2 can effectively reduce the forward voltage drop and the reverse leakage current, thereby improving the reliability of the photovoltaic module 100.

In some embodiments of the present invention, referring to fig. 3 and 4, the first MOS switch 2 has an on-state and an off-state, the on-state includes a first on-state and a second on-state, and the first MOS switch 2 is configured such that a voltage at the first on-state is smaller than a voltage at the second on-state of the first MOS switch 2.

For example, in conjunction with fig. 3 and 4, the first MOS switch 2 may include a switch chip, a control chip, an energy storage element, and the like. The first MOS switch 2 and the first battery cell 11 may have two parallel points. The parallel point at which the voltage of the first battery cell 11 is higher when operating normally is point a and the parallel point at which the voltage is lower is point b. When the first battery unit 11 works normally, Va is larger than Vb, the control chip enables the first MOS switch 2 to be in a cut-off state, and when the battery string is abnormal, Va is smaller than Vb, the control chip enables the first MOS switch 2 to be in a conducting state.

The first MOS switch 2 may be internally provided with a first diode 25, a second diode 26, a charge pump 27, a capacitor 28, a reference comparator 29, and the like, wherein the reference comparator 29 is used for comparing potential differences. When the photovoltaic module 100 normally works, the first MOS switch 2 is in an off state, and at this time, the first diode 25 inside the first MOS switch 2 is in a reverse cut-off state. When the photovoltaic module 100 is presentWhen shielded, the voltage across the first battery cell 11 changes. When the voltage difference exceeds 0.5V, the first diode 25 is turned on to bypass the current through the first diode 25, the resistance of the first diode 25 is large, the first MOS switch 2 is in the second conduction state, and the voltage across the first MOS switch 2 is the high voltage V_H(the voltage drop may be 0.5V-0.6V) and the charge pump 27 is started to drive the voltage V across the first diode 25_HBoosting to 5V charges capacitor 28. When the voltage of the capacitor 28 reaches 5V, the second diode 26 is turned on, the current bypasses the second diode 26, the charge pump 27 is turned off, the resistance of the second diode 26 is small, the first MOS switch 2 is in the first conduction state, and the voltage across the first MOS switch 2 is the low voltage V_LThe capacitor 28 discharges. For a period of time T_LThen, when the voltage of the capacitor 28 is lower than 4.5V, the second diode 26 is turned off. The circulation is carried out, thereby playing the role of reducing power loss. Therefore, the conducting state comprises the first conducting state and the second conducting state, the duration time of the first conducting state and the duration time of the second conducting state can be adjusted through the control circuit, the average conducting voltage of the circuit can be reduced, and the purposes of low power consumption and energy conservation are achieved. Here, it should be noted that the specific structure, operation principle, and the like of the first MOS switch 2 are well known to those skilled in the art, and are not described herein again.

In a further embodiment of the invention, the first MOS switch 2 is configured such that the duration in the first on-state is larger than the duration of the first MOS switch 2 in the second on-state. For example, referring to fig. 4, the first MOS switch 2 may have a periodic distribution of the first on state and the second on state in the on state. When the first MOS switch 2 is in the second conducting state, the high voltage V across the first MOS switch 2_HDriving the internal circuit to operate for a duration of T_HAfter the time, the internally integrated power MOSFET is turned on, the first MOS switch 2 enters a first conduction state, and the voltage at the two ends of the first MOS switch 2 is reduced to a low voltage V_LLast for T_LAfter that time, the circuit re-enters the second conducting state, thereby completing one duty cycle. Wherein, T_HLess than T_L. Thereby the device is provided withSince the voltage in the first on state is small, the average on voltage of the circuit can be effectively reduced by making the duration of the first on state longer than the duration of the first on state, thereby reducing the power consumption of the first MOS switch 2.

In some optional embodiments of the present invention, the first MOS switch 2 may be laminated within the photovoltaic module 100. From this, because photovoltaic module 100's thickness direction's both sides can all be equipped with the encapsulation glued membrane layer, through with first MOS switch 2 lamination in photovoltaic module 100, can separate first MOS switch 2 and external environment effectively to can effectively reduce steam and external environment to first MOS switch 2's influence, can further guarantee photovoltaic module 100's reliability.

In a further embodiment of the present invention, as shown in fig. 8-11, the photovoltaic module 100 further comprises at least one junction box 3, and the first MOS switch 2 is disposed in the junction box 3. For example, in the example of fig. 10, three first battery cell groups 1 and three first MOS switches 2 are shown, in which case, there may be three terminal boxes 3, each terminal box 3 is located between two first battery cells 11 of the corresponding first battery cell group 1, and one first MOS switch 2 is arranged in each terminal box 3, so that the number of cables can be reduced and junction temperature can be lowered in the split terminal box 3. From this, through setting up foretell terminal box 3, terminal box 3 can be used for holding first MOS switch 2, and can play better guard action to first MOS switch 2 and cable, prevents to influence first MOS switch 2's life because impurity such as outside water and dust gets into terminal box 3, can improve photovoltaic module 100's reliability.

Of course, a plurality of first MOS switches 2 (not shown) may be further disposed in each junction box 3, which is not limited by the present invention.

In some embodiments of the present invention, as shown in fig. 10 to 11a, a central bus bar 5 is disposed between two first battery units 11, and the central bus bar 5 extends along the arrangement direction of the unit groups. From this, through setting up foretell center bus bar 5, center bus bar 5 can realize the parallel connection between two first battery unit 11 in the cluster direction of arranging, is favorable to reducing design and the technology degree of difficulty, and simple structure.

In some embodiments of the present invention, referring to fig. 11, the photovoltaic module 100 further includes a second cell unit group 4, the second cell unit group 4 is connected in series with the first cell unit group 1, and the second cell unit group 4 is arranged along the unit group arrangement direction with the first cell unit group 1, the second cell unit group 4 includes a plurality of second cell units, the plurality of second cell units are connected in parallel and are arranged in sequence along the string arrangement direction of the photovoltaic module 100, each second cell unit includes a second cell string 41, the second cell string 41 includes a plurality of second cell sheets 411 that are connected in series and are arranged along the string arrangement direction, and the number of the second cell sheets 411 of each second cell unit is half of the number of the first cell sheets 1111 of each first cell unit 11. Therefore, by arranging the second cell unit group 4, the circuit connection mode is relatively simple, the width change of the assembly is small, the connection arrangement of large-size cell pieces by adopting conventional width glass can be realized, and the problem that the photovoltaic assembly 100 generates load and is out of frame is avoided.

In some embodiments of the utility model, second battery cell group 4 includes two second battery cell, and two second battery strings 41 are first substring and second substring respectively, are connected with lead wire bus bar 6 between the one end of keeping away from the second substring of first substring and the one end of keeping away from first substring of second substring, and lead wire bus bar 6 is connected with central bus bar 5 electricity, and lead wire bus bar 6 extends along the string direction of arranging. Thus, by providing the lead bus bar 6, the number of the second cells 411 is reduced while the current is maintained unchanged, so that the width of the photovoltaic module 100 can be reduced, and when the size of the cells (i.e., the first cell 1111 and the second cell 411) is large (e.g., 210mm), the installation area can be effectively saved. Moreover, the photovoltaic module 100 thus configured can increase the number of the photovoltaic modules 100 installed in the same installation area, so that the overall power generation efficiency of the photovoltaic module 100 can be improved.

In some embodiments of the present invention, referring to fig. 11, the lead bus bar 6 includes a first sub lead bus bar 61 and a second sub lead bus bar 62, one end of the first sub lead bus bar 61 is connected to the center bus bar 5, and the other end is connected to one end of the first sub string, which is away from the center bus bar 5, and one end of the second sub lead bus bar 62 is connected to the first sub lead bus bar 61, and the other end is connected to one end of the second sub string, which is away from the center bus bar 5.

For example, in the example of fig. 11, the first and second sub-lead bus bars 61 and 62 each extend in the string arrangement direction. The first sub-string is connected in series with the first sub-lead bus bar 61, and the first sub-string and the first sub-lead bus bar 61 are arranged along the short side of the photovoltaic module 100, the second sub-string is connected in series with the second sub-lead bus bar 62, and the first sub-string and the second sub-lead bus bar 62 are arranged along the short side of the photovoltaic module 100. Thus, by providing the first and second sub-lead bus bars 61 and 62 as described above, the first and second sub-lead bus bars 61 and 62 can be used to transmit electric current without affecting the overall occupied space of the second battery cell 411.

In some embodiments of the present invention, referring to fig. 11, the center bus bar 5 is electrically connected to the first connection point with the two second battery strings 41, the lead bus bar 6 is electrically connected to the second connection point with the center bus bar 5, and the photovoltaic module 100 further includes a second MOS switch 7, and the second MOS switch 7 is connected in reverse parallel between the first connection point and the second connection point. Therefore, by arranging the second MOS switch 7, the second MOS switch 7 can protect all the second cells 411 in the two second cell strings 41, and when the second cells 411 in the second cell strings 41 are shielded by a shadow, a bypass function can be effectively realized, thereby avoiding a hot spot effect. Moreover, compared with the existing mode of adopting a diode, the forward voltage drop and the reverse leakage current can be reduced, so that serious heating can be avoided when the size of the second cell piece is larger, and the reliability of the photovoltaic module 100 can be further improved.

In some embodiments of the present invention, referring to fig. 11 and 11a, along the string arrangement direction, the central bus bar 5 is located in the middle of the photovoltaic module 100, the central bus bar 5 includes two first edge bus-bars 51 and at least one first middle bus-bar 52, the first middle bus-bar 52 is located between the two first edge bus-bars 51, one end of one of the two first edge bus-bars 51 is connected to the first cell string 111 of the outermost first cell group 1 adjacent to the edge of the photovoltaic module 100, and the other end is a negative lead-out end, one end of the other of the two first edge bus-bars 51 is connected to the lead bus-bar 6, and the other end is a positive lead-out end, the first middle bus-bar 52 is connected between the two adjacent first cell groups 1 to realize the series connection of the two adjacent first cell groups 1, or between the adjacent first cell group 1 and the second cell group 4 to realize the adjacent first cell group 1 and second cell group 4 The cell unit groups 4 are connected in series.

For example, in the examples of fig. 11 and 11a, the lead bus bar 6 is disposed adjacent an edge of the photovoltaic module 100. The center bus bar 5 includes two first edge bus bars 51 and two first middle bus bars 52, one of the two first middle bus bars 52 is connected between adjacent two first battery strings 111 of adjacent two first battery cell groups 1, and the other of the two first middle bus bars 52 is connected between adjacent first battery strings 111 and second battery strings 41. Therefore, by providing the first edge bus-bar section 51 and the first middle bus-bar section 52, the first edge bus-bar section 51 can effectively draw out the current generated by the photovoltaic effect from the first battery slices 1111 and the second battery slices 411, and the first middle bus-bar section 52 can realize the electrical connection between two adjacent battery cell groups (for example, two adjacent first battery cell groups 1 or two adjacent first battery cell groups 1 and second battery cell groups 4), so that the structure is simple and reliable. Wherein the width of the center bus bar 5 may be 5mm to 6mm (inclusive). But is not limited thereto.

Optionally, the width of the photovoltaic module 100 is W, where W may satisfy: w is more than or equal to 1040mm and less than or equal to 1450 mm. For example, W may be 1100 mm. By the arrangement, the photovoltaic module 100 is ensured to have larger power, and meanwhile, the width of the glass of the whole photovoltaic module 100 can be effectively controlled not to be too large, so that the difficulty of glass manufacture procedure is reduced, and the cost of the glass is not affected.

In some embodiments of the present invention, as shown in fig. 10 and 10a, along the string arrangement direction, the central bus bar 5 is located in the middle of the photovoltaic module 100, the central bus bar 5 includes two second edge bus-bars 53 and at least one second middle bus-bar 54, the second middle bus-bar 54 is located between the two second edge bus-bars 53, one end of each second edge bus-bar 53 is connected to the first battery string 111 adjacent to the edge of the photovoltaic module 100 of the corresponding outermost first battery cell group 1, and the other end is a leading-out end, the second middle bus-bar 54 is connected between the two adjacent first battery cell groups 1 to realize the series connection of the two adjacent first battery cell groups 1.

For example, in the example of fig. 10 and 10a, the photovoltaic module 100 includes three first cell stacks 1 connected in series and arranged in the cell stack arrangement direction. The center bus bar 5 includes two second edge bus bars 53 and two second middle bus bars 54, and one end of the left second edge bus bar 53 is connected to the leftmost first cell string 111 and the other end is a negative lead-out terminal. One end of the right second edge bus bar 53 is connected to the rightmost first cell string 111, and the other end is a positive electrode lead-out terminal. Therefore, by arranging the second edge bus-bar section 53 and the second middle bus-bar section 54, the second edge bus-bar section 53 can also effectively lead out the current generated by the plurality of first battery slices 1111 through the photovoltaic effect, and the second middle bus-bar section 54 can realize the electrical connection between two adjacent first battery cell groups 1, and has a simple and reliable structure.

In some embodiments of the present invention, referring to fig. 9, the back of the photovoltaic module 100 is provided with at least one cross bar 81, the cross bar 81 extends along the arrangement direction of the unit group, and the cross bar 81 is disposed adjacent to the central bus bar 5. For example, one cross bar 81 is shown in the example of fig. 9, and the cross bar 81 is provided on the back sheet 8 of the photovoltaic module 100, and the distance between the cross bar 81 and the center bus bar 5 is smaller with respect to the edge of the photovoltaic module 100 in the string arrangement direction. Therefore, by arranging the cross bar 81, the cross bar 81 can be arranged close to the center of the photovoltaic module 100, and the load of the photovoltaic module 100 can be effectively increased, so that the overall structure of the photovoltaic module 100 is more stable and reliable.

In the above embodiment, the cross bar 81 is taken as an example for explanation. One skilled in the art will appreciate that more than one crossbar 81 may be provided. For example, when the number of the cross bars 81 is two, the two cross bars 81 may be respectively located at both sides of the junction box 3, so that the load of the photovoltaic module 100 may be further increased.

In some optional embodiments of the present invention, the number of the first battery slices 1111 of each first battery unit 11 is N, where N satisfies: n is more than or equal to 16 and less than or equal to 32. For example, in the example of fig. 10, the number of the first battery slices 1111 of each first battery unit 11 is equal and 24, and the number of the first battery slices 1111 of each first MOS switch 2 parallel protection is 48. Specifically, when N < 16, the number of the first battery slices 1111 of each first battery unit 11 is too small, which may cause the output power of the photovoltaic module 100 to be too low; when N > 32, the number of the first battery slices 1111 of each first battery unit 11 is too large, which may cause the first MOS switch 2 to have a breakdown risk. Thus, by making N satisfy: n is more than or equal to 16 and less than or equal to 32, so that the photovoltaic module 100 has higher output power and the safety of the first MOS switch 2 can be ensured.

In some embodiments of the present invention, the minimum distance between two adjacent first battery slices 1111 in each first battery string 111 is L₂Wherein L is₂Satisfies the following conditions: l is not more than 0.6mm₂Less than or equal to 1 mm. With such an arrangement, the minimum distance between two adjacent first battery pieces 1111 of the first battery string 111 is small, so that the photoelectric conversion efficiency per unit area of the photovoltaic module 100 can be effectively improved, and the output power of the photovoltaic module 100 can be improved.

In some embodiments of the present invention, the minimum distance between two adjacent first battery cells 11 along the string arrangement direction is L₃Wherein L is₃Satisfies the following conditions: l is more than or equal to 10mm₃Less than or equal to 26 mm. For example, L₃And may be 20 mm. Thereby, by making L₃Satisfies the following conditions: l is more than or equal to 10mm₃26mm or less, the first cell 1111 can be prevented from being shielded by the junction box 3, so that the reliability of the photovoltaic module 100 can be improved.

In some embodiments of the present invention, the ratio of the area of each first cell 1111 to the complete cell is S, wherein S satisfies: 1/6 is less than or equal to S is less than or equal to 1/2. That is, each cell 1111 may be one-half to one-sixth of a full cell. For example, the first cell piece 1111 may be formed by cutting a complete cell piece perpendicular to the extending direction of the bus bars, or the first cell piece 1111 may be formed by cutting a complete cell piece perpendicular to the extending direction of the bus bars and parallel to the extending direction of the bus bars. For example, when the first cell 1111 is one fourth of a complete cell, the first cell 1111 may be formed by cutting four equal parts of the complete cell along a direction perpendicular to the extending direction of the bus bars, and the number of the bus bars on the first cell 1111 is equal to the number of the bus bars of the complete cell; or, the first battery piece 1111 may also be a complete battery piece that is divided into two parts along a direction perpendicular to the extending direction of the bus bars and divided into four equal parts along a direction parallel to the extending direction of the bus bars, where the number of the bus bars on the first battery piece 1111 is half of the number of the bus bars of the complete battery piece. Thus, compared with using a complete cell, the first cell 11111 can reduce internal loss, thereby improving the output power of the photovoltaic module 100 and contributing to reducing the cost per watt.

In some optional embodiments of the present invention, each first cell 1111 may be one-half of a complete cell, the length extending direction of each first cell 1111 is the cell group arrangement direction, and the width extending direction of each first cell 1111 is the string arrangement direction. For example, the half first cell piece 1111 may be processed by laser scribing. From this, compare in adopting complete battery piece, can reduce photovoltaic module 100's internal loss, and through adopting above-mentioned circuit connection, make every first battery cluster 111 reduce to adopting the half of complete battery piece output current, rethread two first battery unit 11 parallel connection, make photovoltaic module 100's output current still the same with output current when adopting complete battery piece, avoided the voltage reduction that causes because of adopting half first battery piece 1111, simultaneously because the reducible internal loss of half first battery piece 1111 electric currents, thereby improved photovoltaic module 100's output, help reducing the cost of single watt.

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

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

1. A photovoltaic module, comprising:

at least one first battery unit group, first battery unit group includes a plurality of first battery unit, and is a plurality of first battery unit parallel connection just follows photovoltaic module's cluster direction of arranging is arranged in proper order, every first battery unit includes a plurality of first battery strings, and is a plurality of first battery string series connection and follow with the cluster direction of arranging vertically cell group direction of arranging is arranged, every first battery string includes series connection and follows a plurality of first battery pieces that the cluster direction of arranging was arranged, every the length of first battery piece is L₁Wherein, said L₁Satisfies the following conditions: l is more than or equal to 182mm₁≤240mm；

At least one first MOS switch connected in anti-parallel with each of the plurality of first battery cells of the first battery cell group.

2. The photovoltaic module of claim 1, wherein the first MOS switch has an on-state and an off-state,

the on-state includes a first on-state and a second on-state, the first MOS switch being configured such that a voltage in the first on-state is less than a voltage in the second on-state of the first MOS switch.

3. The photovoltaic module of claim 1, wherein the first MOS switch is laminated within the photovoltaic module.

4. The photovoltaic module of claim 1, further comprising:

the first MOS switch is arranged in the junction box.

5. The photovoltaic module according to claim 4, wherein the number of the first cell units is three, and the three first cell units are sequentially arranged along the unit arrangement direction, and each first cell unit comprises two first cell units;

the number of the junction boxes is three, each junction box is respectively located between two first battery units of the corresponding first battery unit group, and at least one first MOS switch is arranged in each junction box.

6. The photovoltaic module according to claim 1, wherein a center bus bar is provided between two of the first battery cells in the string arrangement direction, the center bus bar extending in the cell group arrangement direction.

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

the second battery unit group, the second battery unit group with first battery unit group series connection, just the second battery unit group with first battery unit group follows the direction is arranged to the unit group, the second battery unit group includes a plurality of second battery cells, and is a plurality of second battery cell parallel connection just follows photovoltaic module's cluster direction of arranging is arranged in proper order, every the second battery cell includes a second battery cluster, the second battery cluster includes series connection and follows a plurality of second battery pieces that the direction was arranged are arranged to the cluster, every the second battery cell the quantity of second battery piece is every first battery cell half of the quantity of first battery piece.

8. The pv module of claim 7 wherein the second cell stack includes two second cells, the two second cells being a first sub-string and a second sub-string, a lead bus is connected between an end of the first sub-string distal from the second sub-string and an end of the second sub-string distal from the first sub-string, the lead bus is electrically connected to the central bus, and the lead bus extends along the string arrangement direction.

9. The photovoltaic module of claim 8, wherein the lead bus bar comprises a first sub-lead bus bar and a second sub-lead bus bar, the first sub-lead bus bar having one end connected to the center bus bar and the other end connected to an end of the first sub-string remote from the center bus bar, the second sub-lead bus bar having one end connected to the first sub-lead bus bar and the other end connected to an end of the second sub-string remote from the center bus bar.

10. The assembly of claim 8, wherein the center bus bar is electrically connected to two of the second cell strings at a first connection point, and the lead bus bar is electrically connected to the center bus bar at a second connection point, the assembly further comprising a second MOS switch connected in anti-parallel between the first connection point and the second connection point.

11. The pv module according to claim 8 wherein the center bus bar is located in the middle of the pv module along the string direction, the center bus bar comprises two first edge bus segments and at least one first middle bus segment, the first middle bus segment is located between the two first edge bus segments, one of the two first edge bus segments has one end connected to the first string of cells of the outermost first cell group adjacent to the edge of the pv module and the other end is a negative lead-out end, the other of the two first edge bus segments has one end connected to the lead bus bar and the other end is a positive lead-out end, the first middle bus segments are connected between the adjacent two first cell groups to enable series connection of the adjacent two first cell groups, Or between the adjacent first and second cell stacks to enable series connection of the adjacent first and second cell stacks.

12. The photovoltaic module of claim 7, wherein the photovoltaic module has a width W, wherein W satisfies: w is more than or equal to 1040mm and less than or equal to 1450 mm.

13. The pv module according to claim 6, wherein the central bus bar is located in a middle portion of the pv module along the string arrangement direction, the central bus bar includes two second edge bus bars and at least one second middle bus bar, the second middle bus bar is located between the two second edge bus bars, one end of each second edge bus bar is connected to the first cell string of the corresponding outermost first cell group adjacent to the edge of the pv module, and the other end is a lead-out end, and the second middle bus bar is connected between the two adjacent first cell groups to realize serial connection of the two adjacent first cell groups.

14. The photovoltaic module of claim 6, wherein the width of the central bus bar is 5mm to 6 mm.

15. The assembly according to claim 6, characterized in that the back of the assembly is provided with at least one cross bar extending in the direction of arrangement of the cell groups, the cross bar being arranged adjacent to the central bus bar.

16. The photovoltaic module of any of claims 1-15, wherein the number of the first cells of each of the first cells is N, wherein N satisfies: n is more than or equal to 16 and less than or equal to 32.

17. The photovoltaic module according to any one of claims 1 to 15, wherein the minimum distance between two adjacent first cells in each first cell string is L₂Wherein, said L₂Satisfies the following conditions: l is not more than 0.6mm₂≤1mm。

18. The photovoltaic module of any of claims 1-15, wherein the minimum distance between two adjacent first cells along the string direction is L₃Wherein, said L₃Satisfies the following conditions: l is more than or equal to 10mm₃≤26mm。

19. The photovoltaic module of any of claims 1-15 wherein the ratio of the area of each first cell to the area of the complete cell is S, wherein S satisfies: 1/6 is less than or equal to S is less than or equal to 1/2.

20. The photovoltaic module according to any one of claims 1 to 15, wherein each of the first cell pieces is one half of a complete cell piece, the length extension direction of each of the first cell pieces is the cell group arrangement direction, and the width extension direction of each of the first cell pieces is the string arrangement direction.

21. The photovoltaic module of any of claims 1-15, wherein the first MOS switch has an on state and an off state, the on state including a first on state and a second on state, the first MOS switch configured to have a voltage in the first on state that is less than a voltage of the first MOS switch in the second on state, the first MOS switch configured to have a duration in the first on state that is greater than a duration in the second on state.

22. The photovoltaic module of any of claims 1-15, wherein the first MOS switch has an on state and an off state, the on state including a first on state and a second on state, the first MOS switch configured such that a voltage in the first on state is less than a voltage in the second on state of the first MOS switch,

the first MOS switch is in the on state,

the first conducting state and the second conducting state are distributed periodically.

23. The pv assembly according to any one of claims 1-15, wherein the first cell group comprises two of the first cells, the first MOS switch is located between the two of the first cells along the string direction, the first MOS switch comprises a first pin electrically connected to one end of one of the two of the first cells, a second pin electrically connected to one end of the other of the two of the first cells, and a third pin electrically connected to the other end of both of the two of the first cells.

24. The photovoltaic module of claim 23, wherein the first pin and the second pin are anodes of the MOS switches, the first pin and the second pin are both connected to a negative output of the photovoltaic module, the third pin is a cathode of the MOS switch, and the third pin is connected to a positive output of the photovoltaic module.

25. The photovoltaic module of claim 23, wherein the first MOS switch further comprises a fourth pin, and wherein the fourth pin is grounded.