CN216213494U

CN216213494U - Photovoltaic module

Info

Publication number: CN216213494U
Application number: CN202122589448.XU
Authority: CN
Inventors: 吴艳芬; 刘宣宣; 陈辉; 董经兵; 许涛
Original assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Current assignee: CSI Cells Co Ltd; Canadian Solar Manufacturing Changshu Inc
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-04-05
Anticipated expiration: 2031-10-27

Abstract

The utility model discloses a photovoltaic module, comprising: two battery units, two battery unit series connection and arrange along the cluster direction of arranging with battery cluster extending direction vertically, two battery units arrange the direction through tip busbar series connection with the one end of direction along the cluster, the other end of one of them battery unit in two battery units is connected and is drawn forth the busbar and draw forth anodal, another battery unit's in two battery units other end is connected and is drawn forth the busbar and draw forth the negative pole, two battery units constitute the U type with the tip busbar and arrange, every battery unit includes a plurality of battery strings of arranging along the cluster direction of arranging, every battery string includes series connection and a plurality of battery pieces of arranging along battery cluster extending direction, a plurality of battery pieces in every battery string are through welding the area series connection in proper order. According to the photovoltaic module, the circuit design is simplified, the laying rate of the photovoltaic module can be improved, and meanwhile, the safety and the reliability of the photovoltaic module can be improved.

Description

Photovoltaic module

Technical Field

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

Background

Along with the rapid growth of the market demand of the photovoltaic module, users are higher and higher for the photovoltaic module, and the photovoltaic module is required to meet the requirements of various fields and different installation environments while the photovoltaic module is ensured to have higher efficiency. In the related art, the circuit design of the photovoltaic module is complex, the laying efficiency of the photovoltaic module is low, and the safety and reliability of the photovoltaic module can be reduced.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a photovoltaic module, which simplifies circuit design, can increase the laying rate of the photovoltaic module, and can improve the safety and reliability of the photovoltaic module.

A photovoltaic module according to an embodiment of the present invention includes: two battery units, two battery unit series connection just arranges along the cluster direction of arranging with battery cluster extending direction vertically, two battery unit's edge the same one end of cluster direction of arranging is through tip busbar series connection, two among the battery unit one battery unit's the other end is connected and is drawn forth the busbar and draw forth anodal, two another among the battery unit the other end of battery unit is connected draw forth the busbar and draw forth the negative pole, two battery unit with the tip busbar constitutes the U type and arranges, every battery unit includes the edge a plurality of battery strings that the cluster direction of arranging was arranged, every battery string includes series connection and follows a plurality of battery pieces that battery cluster extending direction arranged, every a plurality of in the battery string the battery piece is through the solder strip series connection in proper order.

According to the photovoltaic module of the embodiment of the utility model, the end bus bars are connected in series at one ends of the two battery units in the string arrangement direction, and the positive electrode and the negative electrode are respectively arranged at the other ends of the two battery units in the string arrangement direction. Therefore, the circuit design is simplified, the laying rate of the photovoltaic module can be improved, and the safety and the reliability of the photovoltaic module can be improved while the electric connection between the adjacent battery pieces in the battery string is facilitated.

According to some embodiments of the utility model, the photovoltaic module further comprises: the battery pack comprises a plurality of parallel bus bars, wherein each parallel bus bar extends along the serial arrangement direction, and each parallel bus bar is connected with the corresponding welding strip in the battery string of the battery unit and is positioned in the sheet gap of two adjacent battery sheets in the battery string.

According to some embodiments of the present invention, in the battery unit, at least one first sheet gap and a plurality of second sheet gaps are provided between two adjacent battery sheets in the extending direction of the battery string, the first sheet gap is larger than the second sheet gap, and the parallel bus bar is located in the first sheet gap.

According to some embodiments of the utility model, the plurality of battery pieces includes at least two first battery pieces having the first piece gap therebetween, and the parallel bus bar is spaced apart from the first battery pieces by a distance L₁Wherein the L1 satisfies: l is not less than 0.5mm₁≤3mm。

According to some embodiments of the utility model, the parallel bus bar has a width W₁The thickness of the parallel bus bar is H₁Wherein, the W₁、H₁Respectively satisfy: w is not less than 1mm₁≤4mm，0.1mm≤H₁≤0.4mm。

According to some embodiments of the present invention, the parallel bus bar is connected to each of the plurality of battery strings, the parallel bus bar dividing the corresponding battery cell into a plurality of sub-battery cells; the photovoltaic module further includes: the bypass bus bars extend along the extending direction of the battery strings, two ends of each bypass bus bar are respectively connected with two ends of the battery units, each bypass bus bar is connected with the corresponding parallel bus bar, a plurality of bypass protecting pieces are connected onto each bypass bus bar, and each bypass protecting piece is reversely connected with the corresponding sub-battery unit in parallel.

According to some embodiments of the utility model, the bypass bus bar is located between two adjacent battery strings of the corresponding battery cell.

According to some embodiments of the utility model, the bypass bus bar is located within a string gap of two adjacent battery strings; or the bypass bus bar is positioned on the back of the plurality of battery pieces of the corresponding battery string.

According to some embodiments of the utility model, the end bus bar has a width W₂The thickness of the end bus bar is H₂Wherein, the W₂、H₂Respectively satisfy: w is not less than 2mm₂≤8mm，0.2mm≤H₂≤0.45mm。

According to some embodiments of the utility model, the number of the battery strings of each of the battery cells is N₁Wherein, the N is₁Satisfies the following conditions: n is not less than 3₁≤6。

According to some embodiments of the utility model, the number of the battery pieces of each of the battery strings is N₂Wherein, the N is₂Satisfies the following conditions: n is more than or equal to 20₂≤80。

According to some embodiments of the utility model, each of the battery pieces is provided with a plurality of main grid lines, each of the main grid lines extends along the string extending direction, and the number of the main grid lines is N₃Wherein, the N is₃Satisfies the following conditions: n is not less than 7₃≤30。

According to some embodiments of the utility model, each of the battery pieces has a length L₂Each of the battery pieces has a width W₃Wherein, said L₂、W₃Satisfies the following conditions: 1/3 is less than or equal to W₃/L₂≤1/6。

According to some embodiments of the utility model, each of the battery pieces has a length L₂Said L is₂Satisfies the following conditions: l is more than or equal to 156mm₂≤240mm。

Additional aspects and advantages of the utility model 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 utility model.

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 view of a photovoltaic module according to a first embodiment of the present invention;

fig. 2 is a schematic structural view of a photovoltaic module according to a second embodiment of the present invention;

FIG. 3 is a circuit diagram of a photovoltaic module according to an embodiment of the present invention;

FIG. 4 is a schematic view of a photovoltaic module according to an embodiment of the present invention;

fig. 5 is a partially enlarged view of the photovoltaic module shown in fig. 4.

Reference numerals:

100: a photovoltaic module;

1: a battery cell; 11: a battery string; 111: a battery piece; 112: a first sheet gap;

113: a second sheet gap; 114: a first cell piece; 115: welding a strip; 2: an end bus bar;

3: a positive electrode; 4: a negative electrode; 5: parallel bus bars; 6: a bypass bus bar;

7: a bypass guard; 8: and leading out the bus bar.

Detailed Description

A photovoltaic module 100 according to an embodiment of the present invention is described below with reference to fig. 1-5.

As shown in fig. 1 to 5, a photovoltaic module 100 according to an embodiment of the present invention includes two battery cells 1.

Specifically, two battery units 1 are connected in series and arranged in a string arrangement direction (e.g., a left-right direction in fig. 1) perpendicular to a battery string extending direction (e.g., an up-down direction in fig. 1), the same ends of the two battery units 1 in the string arrangement direction are connected in series by end bus bars 2, the other end of one of the two battery units 1 is connected to a lead-out bus bar 8 and leads out a positive electrode 3, the other end of the other of the two battery units 1 is connected to a lead-out bus bar 8 and leads out a negative electrode 4, the two battery units 1 and the end bus bar 2 form a U-shaped arrangement, each battery unit 1 includes a plurality of battery strings 11 arranged in the string arrangement direction, each battery string 11 includes a plurality of battery sheets 111 connected in series and arranged in the battery string extending direction, and the plurality of battery sheets 111 in each battery string 11 are sequentially connected in series by solder ribbons 115. In the description of the present invention, "a plurality" means two or more.

For example, in the example of fig. 1 to 4, two battery units 1 are connected in a U shape, one end of each of a plurality of battery strings 11 of one of the two battery units 1 is connected to the same lead-out bus bar 8, the free end of the lead-out bus bar 8 is a positive electrode 3, one end of each of a plurality of battery strings 11 of the other of the two battery units 1 is connected to the other lead-out bus bar 8, and the free end of the lead-out bus bar 8 is a negative electrode 4. The battery string 11 may include forty-four battery pieces 111, and two adjacent battery pieces 111 may be connected by a plurality of solder ribbons 115 to form a complete battery string 11. The end bus bars 2 may extend in the string arrangement direction, and the end bus bars 2 may be connected between the lower ends of the two battery cells 1 by a plurality of solder ribbons 115. Therefore, compared with the traditional photovoltaic module, the circuit design is simple, so that the laying rate of the photovoltaic module 100 can be improved, all the battery pieces 111 can be regularly and relatively closely arranged, and the safety and the reliability of the photovoltaic module 100 can be improved while the electric connection between the adjacent battery pieces 111 in the battery string 11 is facilitated.

According to the photovoltaic module 100 of the embodiment of the present invention, by connecting the end bus bar 2 in series to one end of the two battery cells 1 in the string arrangement direction, the positive electrode 3 and the negative electrode 4 are respectively provided at the other end of the two battery cells 1 in the string arrangement direction. Therefore, the circuit design is simplified, the laying rate of the photovoltaic module 100 can be increased, and the safety and reliability of the photovoltaic module 100 can be improved while facilitating the electrical connection between the adjacent cells 111 in the cell string 11.

According to some embodiments of the present invention, the photovoltaic module 100 further includes a plurality of parallel bus bars 5, each parallel bus bar 5 extending along the string arrangement direction, each parallel bus bar 5 being connected to the solder ribbon 115 in the cell string 11 of the corresponding battery unit 1 and being located in the sheet gap between two adjacent battery sheets 111 in the cell string 11. Referring to fig. 1 to 5, the parallel bus bars 5 are two, and the two parallel bus bars 5 are spaced apart from each other in the string arrangement direction. Therefore, the space between two adjacent cells 111 can be effectively utilized, so that the arrangement of the cells 111 in the photovoltaic module 100 is more compact, and the shielding of the parallel bus bar 5 on the cells 111 can be avoided, so that the hot spot effect of the cells 111 can be avoided, and the output power of the photovoltaic module 100 is ensured.

Further, as shown in fig. 5, in the battery unit 1, at least one first sheet gap 112 and at least one second sheet gap 113 are provided between two adjacent battery sheets 111 in the battery string extending direction, the first sheet gap 112 is larger than the second sheet gap 113, and the parallel bus bar 5 is located in the first sheet gap 112. By such arrangement, the parallel bus bars 5 and the cell sheets 111 can be spaced apart, the parallel bus bars 5 are prevented from shielding the cell sheets 111, and meanwhile, the parallel bus bars 5 can be prevented from shifting in the laminating process of the photovoltaic module 100 to cause hidden cracks of the cell sheets 111.

In some optional embodiments, the plurality of battery pieces 111 includes at least two first battery pieces 114, the two first battery pieces 114 have a first piece gap 112 therebetween, and the distance between the parallel bus bar 5 and the first battery pieces 114 is L₁Wherein L is₁Satisfies the following conditions: l is not less than 0.5mm₁Less than or equal to 3 mm. Specifically, two cell pieces 11 adjacent to the center line of the cell string extending direction of the photovoltaic module 100 among the plurality of cell pieces 1111 may be the first cell 114, two first cells 114 are located at both sides of the center line, and the parallel bus bar 5 may be disposed at the center line. Thereby, by making L₁Satisfies the following conditions: l is not less than 0.5mm₁Less than or equal to 3mm, so that the width of the parallel bus bar 5 is less than that of the first sheet gap 112, and the parallel bus bar 5 can be effectively spaced from the two first battery sheets 114, thereby preventing the first battery sheets 114 from being hidden and cracked due to the deviation of the parallel bus bar 5 in the laminating process of the photovoltaic module 100, and ensuring the output power of the photovoltaic module 100.

In some alternative embodiments, the parallel bus bar 5 has a width W₁The thickness of the parallel bus bar 5 is H₁Wherein W is₁、H₁Respectively satisfy: w is not less than 1mm₁≤4mm，0.1mm≤H₁Less than or equal to 0.4 mm. When W is₁When the width of the parallel bus bar 5 is smaller than 1mm, the resistance of the parallel bus bar 5 is larger, the conductive capability of the parallel bus bar 5 is weaker, the contact area between the parallel bus bar 5 and the battery piece 111 is smaller, and the risk of breaking the battery piece 111 is increased; when W is₁At > 4mm, the width of the parallel bus bar 5 is too large, resulting in a high cost of the parallel bus bar 5. When H is present₁When the thickness of the parallel bus bar 5 is less than 0.1mm, the thickness of the parallel bus bar 5 is too small, so that the resistance of the parallel bus bar 5 is large, and the conductive capability of the parallel bus bar 5 is possibly weak; when H is present₁Above 0.4mm, the thickness of the parallel bus bar 5 is too great, increasing the risk of splitting the cell sheet 111 and resulting in higher cost of the photovoltaic module 100. Thereby, by making W₁、H₁Respectively satisfy: w is not less than 1mm₁≤4mm，0.1mm≤H₁The thickness of the parallel bus bar 5 is more reasonable, and on one hand, the resistance of the parallel bus bar 5 is smaller, the conducting capacity is stronger, and the cost is lower; on the other hand, the risk of cracking of the cell 111 can be effectively reduced, and the reliability of the photovoltaic module 100 is ensured.

Alternatively, the parallel bus bar 5 may be a parallel bus bar 5 having a smaller cross-sectional area when it is laid. This can shorten the dimension of the photovoltaic module 100 in the longitudinal direction, and can reduce the cost of the photovoltaic module 100.

According to some embodiments of the present invention, as shown in fig. 1 to 4, the parallel bus bars 5 are connected to each of the plurality of battery strings 11, and the parallel bus bars 5 divide the corresponding battery cell 1 into a plurality of sub-battery cells. The photovoltaic module 100 further includes a plurality of bypass bus bars 6, each bypass bus bar 6 extends along the cell string extending direction, both ends of each bypass bus bar 6 are respectively connected to both ends of the battery cells 1, and each bypass bus bar 6 is connected to the corresponding parallel bus bar 5, a plurality of bypass protectors 7 are connected to each bypass bus bar 6, and each bypass protector 7 is connected in inverse parallel to the corresponding sub-battery cell 1.

For example, in the example of fig. 1 to 4, each battery unit 1 may include three battery strings 11, the three battery strings 11 are spaced apart from each other in the string arrangement direction, and in the battery unit 1, the parallel bus bar 5 may divide the battery unit 1 into upper and lower two sub-battery units, the parallel bus bar 5 may connect the three battery strings 11 in each sub-battery unit in parallel, each battery unit 1 includes one bypass bus bar 6, the bypass bus bar 6 extends in a straight line, and one lengthwise end of the bypass bus bar 6 is connected to the end bus bar 2, and the other lengthwise end of the bypass bus bar 6 is connected to the negative electrode 4 or the positive electrode 3. Therefore, by arranging the plurality of parallel bus bars 5 and the plurality of bypass bus bars 6, when the photovoltaic module 100 generates a hot spot effect, the plurality of parallel bus bars 5 can transfer the current generated by the cells 111 of the plurality of cell strings 11 through the photovoltaic effect to the bypass bus bars 6 as much as possible, and finally lead out through the positive electrode 3 and the negative electrode 4, thereby ensuring that the photovoltaic module 100 has high output power.

In addition, two bypass protectors 7 may be connected to each bypass bus bar 6, and the two bypass protectors 7 are connected in reverse parallel to the two sub-battery cells 1, respectively. Therefore, the bypass protectors 7 can protect all the cells 111 in the photovoltaic module 100, and when the cells 111 in the photovoltaic module 100 are hot spot or damaged, the bypass protector 7 adjacent to the cells 111 can bypass the cells 111 and protect other cells 111 in the photovoltaic module 100 that are not hot spot or damaged, so that the current in the photovoltaic module 100 can be smoothly led out, and the output power of the photovoltaic module 100 can be effectively ensured.

Six battery strings 11 and four bypass protectors 7 are shown in fig. 1 and 2 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solution of the present application that the solution can be applied to other numbers of battery strings 11 and bypass protectors 7, which also fall within the scope of the present invention.

Alternatively, each bypass protector 7 may be a bypass diode (as shown in fig. 1) or a MOS transistor (as shown in fig. 2). The MOS tube has the performance of forward voltage drop and reverse leakage current, and meanwhile, the heat productivity of the MOS tube is low, so that the safety and the reliability of the photovoltaic module 100 can be further improved. The bypass diode can play a bypass role, when the cell 111 has a hot spot effect, the current generated by other cells 111 of the photovoltaic module 100 can be led out through the parallel bus bar 5, the bypass bus bar 6 and the bypass diode, so that the photovoltaic module 100 can continue to generate electricity, and the situation that the generating circuit of the photovoltaic module 100 is not communicated due to the problem of one cell 111 can be avoided.

Further, when the bypass protector 7 is a MOS transistor, the MOS transistor may be laminated inside the photovoltaic module 100. For example, the MOS transistor may be laminated on the same layer as the cell sheet 111; or, the MOS transistor may also be laminated in the encapsulation adhesive film layer of the photovoltaic module 100 to protect the MOS transistor, so that the MOS transistor can be prevented from being damaged in the transportation process, and meanwhile, the junction box can be saved and the cost can be reduced; or, the MOS tube can be arranged in the junction box, so that the MOS tube is convenient to install, and when the MOS tube is damaged, an operator can directly replace the junction box, so that the maintenance efficiency of the photovoltaic module 100 can be improved.

Further, the bypass bus bar 6 is located between the adjacent two battery strings 11 of the corresponding battery unit 1. For example, as shown in fig. 1 and fig. 2, the bypass bus bar 6 may be located in a string gap between two adjacent battery strings 11, so as to effectively utilize a space between two adjacent battery strings 11, reduce the shielding of the battery piece 111, and when the photovoltaic module 100 is a dual-glass module, effectively ensure the power generation amount on the back surface of the battery piece 111, and ensure that the photovoltaic module 100 has high output power. Alternatively, the bypass bus bar 6 may be located on the back surface of the plurality of battery pieces 111 of the corresponding battery string 11. So set up, on the one hand, can reduce the positive sheltering from of battery piece 111 to can guarantee the photoelectric conversion efficiency of battery piece 111, bypass busbar 6 can need not to occupy the space on the length direction of photovoltaic module 100 simultaneously, and the distance between two adjacent battery pieces 111 in the battery cluster 11 can be less, thereby makes photovoltaic module 100 of the same area can hold more quantity of battery pieces 111, has improved photovoltaic module 100 unit area's generated energy.

In some alternative embodiments, the end bus bar 2 has a width W₂The thickness of the end bus bar 2 is H₂Wherein W is₂、H₂Respectively satisfy: w is not less than 2mm₂≤8mm，0.2mm≤H₂Less than or equal to 0.45 mm. For example, when W₂If the width of the end bus bar 2 is too small at < 2mm, the resistance of the end bus bar 2 is large, the conductive capability of the end bus bar 2 may be weak, the contact area between the end bus bar 2 and the battery piece 111 may be too small, and the risk of breaking the battery piece 111 may be increased; when W is₂At > 8mm, the width of the end bus bar 2 is too large, resulting in a high cost of the end bus bar 2. When H is present₂If the thickness is less than 0.2mm, the thickness of the end bus bar 2 is too small, so that the resistance of the end bus bar 2 is large, which may result in poor conductivity of the end bus bar 2; when H is present₂Above 0.45mm, the thickness of the end bus bar 2 is too great, increasing the risk of splitting the cell sheet 111 and resulting in a higher cost of the photovoltaic module 100. Thereby, by making W₂、H₂Respectively satisfy: w is not less than 2mm₂≤8mm，0.2mm≤H₂Less than or equal to 0.45mm, the width and thickness of the end bus bar 2 are more reasonable, on one hand, the resistance of the end bus bar 2 is smaller, the conductive capability is stronger, and the cost is lower; on the other hand, the risk of cracking of the cell 111 can be effectively reduced, and the reliability of the photovoltaic module 100 is ensured.

In some alternative embodiments, each cellThe number of cell strings 11 of the unit 1 is N₁Wherein N is₁Satisfies the following conditions: n is not less than 3₁Less than or equal to 6. Wherein N is₁The value can be 3, 4, 5 or 6, and the output power of the photovoltaic module 100 can be ensured.

In some alternative embodiments, the number of the battery sheets 111 of each battery string 11 is N₂Wherein N is₂Satisfies the following conditions: n is more than or equal to 20₂Less than or equal to 80. Therefore, the output power of the photovoltaic module 100 is ensured, and meanwhile, the length of the photovoltaic module 100 is ensured to be within a reasonable range, so that the photovoltaic module 100 is convenient to transport and install.

In some optional embodiments, a plurality of main grid lines are provided on each cell 111, each main grid line extends along the extending direction of the cell string, and the number of the main grid lines is N₃Wherein N is₃Satisfies the following conditions: n is not less than 7₃Less than or equal to 30. For example, referring to fig. 5, the number of the bus bars may be ten, and the ten bus bars may be spaced apart from each other in the string arrangement direction. By making N₃Satisfies the following conditions: n is not less than 7₃Less than or equal to 30, the light receiving area of the light receiving surface of the cell 111 is ensured, the current generated by the cell 111 can be effectively led out, and the photovoltaic module 100 has high photoelectric conversion efficiency.

In some alternative embodiments, each cell 111 has a length L₂Each cell 111 has a width W₃Wherein L is₂、W₃Satisfies the following conditions: 1/3 is less than or equal to W₃/L₂Less than or equal to 1/6. For example, the battery sheet 111 may be divided from a complete battery sheet, wherein the ratio of the length to the width of the battery sheet 111 may be one third, one fourth, one fifth or one sixth. Therefore, the cell 111 is a small-sized cell, so that the current at the end of the photovoltaic module 100 can be reduced, the current loss of the photovoltaic module 100 can be reduced, and the output power of the photovoltaic module 100 is improved.

In some alternative embodiments, each cell 111 has a length L₂，L₂Satisfies the following conditions: l is more than or equal to 156mm₂Less than or equal to 240 mm. Therefore, the output power of the photovoltaic module 100 is ensured, and meanwhile, the length of the photovoltaic module 100 can be within a reasonable range, so that the photovoltaic module is convenient to useTransportation of the photovoltaic module 100.

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", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

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 utility model. 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 utility model 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 utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, comprising:

two battery units which are connected in series and arranged along a string arrangement direction perpendicular to the extending direction of the battery string, wherein the same ends of the two battery units along the string arrangement direction are connected in series through end bus bars, the other end of one of the two battery units is connected with a lead-out bus bar and leads out a positive electrode, the other end of the other battery unit is connected with the lead-out bus bar and leads out a negative electrode, and the two battery units and the end bus bars form a U-shaped arrangement,

every the battery unit includes along a plurality of battery strings that the cluster direction of arranging was arranged, every the battery string includes series connection and follows a plurality of battery pieces that battery string extending direction arranged, every in the battery string a plurality of the battery piece is through welding the area series connection in proper order.

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

the battery pack comprises a plurality of parallel bus bars, wherein each parallel bus bar extends along the serial arrangement direction, and each parallel bus bar is connected with the corresponding welding strip in the battery string of the battery unit and is positioned in the sheet gap of two adjacent battery sheets in the battery string.

3. The photovoltaic module according to claim 2, wherein in the battery unit, at least one first sheet gap and a plurality of second sheet gaps are formed between two adjacent battery sheets along the extending direction of the battery string, the first sheet gap is larger than the second sheet gap, and the parallel bus bar is located in the first sheet gap.

4. The pv module of claim 3 wherein the plurality of cells includes at least two first cells with the first gap therebetween, the parallel bus bar being spaced from the first cells by a distance L₁Wherein the L1 satisfies: l is not less than 0.5mm₁≤3mm。

5. The photovoltaic module of claim 2, wherein the parallel bus bar has a width W₁The thickness of the parallel bus bar is H₁Wherein, the W₁、H₁Respectively satisfy: w is not less than 1mm₁≤4mm，0.1mm≤H₁≤0.4mm。

6. The photovoltaic module of claim 2, wherein the parallel bus bar is connected to each of the plurality of cell strings, the parallel bus bar dividing the corresponding cell unit into a plurality of sub-cell units;

the photovoltaic module further includes:

the bypass bus bars extend along the extending direction of the battery strings, two ends of each bypass bus bar are respectively connected with two ends of the battery units, each bypass bus bar is connected with the corresponding parallel bus bar, a plurality of bypass protecting pieces are connected onto each bypass bus bar, and each bypass protecting piece is reversely connected with the corresponding sub-battery unit in parallel.

7. The photovoltaic module of claim 6, wherein the bypass bus bar is located between two adjacent cell strings of the corresponding cell unit.

8. The photovoltaic module of claim 7, wherein the bypass bus bar is located within a string gap of two adjacent strings of cells; or

The bypass bus bar is positioned on the back of the plurality of battery pieces of the corresponding battery string.

9. The photovoltaic module of claim 1, wherein the end bus bar has a width W₂The thickness of the end bus bar is H₂Wherein, the W₂、H₂Respectively satisfy: w is not less than 2mm₂≤8mm，0.2mm≤H₂≤0.45mm。

10. The photovoltaic module of claim 1, wherein the number of strings of each cell unit is N₁Wherein, the N is₁Satisfies the following conditions: n is not less than 3₁≤6。

11. The photovoltaic module of claim 1, wherein the number of the cell pieces of each cell string is N₂Wherein, the N is₂Satisfies the following conditions: n is more than or equal to 20₂≤80。

12. The photovoltaic module of claim 1, wherein each of the cell sheets has a plurality of bus bars, each of the bus bars extending along the string extending direction, and the number of the bus bars is N₃Wherein, the N is₃Satisfies the following conditions: n is not less than 7₃≤30。

13. The photovoltaic module of any of claims 1-12 wherein each of the cells has a length L₂Each of the battery pieces has a width W₃Wherein, said L₂、W₃Satisfies the following conditions: 1/3 is less than or equal to W₃/L₂≤1/6。

14. The assembly according to claim 1, wherein each of the cells has a length L₂Said L is₂Satisfies the following conditions: l is more than or equal to 156mm₂≤240mm。