Photovoltaic module

Abstract

The invention discloses a photovoltaic module, and relates to the technical field of photovoltaic power generation. The photovoltaic module comprises a first end bus bar, a first middle bus bar, a second end bus bar, a first battery string group and a second battery string group, one end of the first jumper bus bar is connected with the first end bus bar, the other end of the first jumper bus bar is connected with the second end bus bar, and the middle of the first jumper bus bar is connected with the first middle bus bar; the first diode is connected with the first jumper bus bar and is positioned between the first end bus bar and the first middle bus bar; the second diode is connected with the first jumper bus bar and is positioned between the second end bus bar and the first middle bus bar; the battery strings of the first battery string group are connected in parallel, the battery strings of the second battery string group are connected in parallel, and the first battery string group and the second battery string group are connected in series. According to the embodiment of the invention, holes are prevented from being formed in the middle area of the backplane in the length direction with relatively large stress based on circuit optimization, so that the backplane is prevented from being broken, and the strength of the photovoltaic module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a photovoltaic module. Background Art

[0002] Photovoltaic modules convert light energy into electrical energy through the photovoltaic effect of the cell, and then export it after collecting the electrical energy. Currently, the multi-slicing technology that divides the entire cell into multiple slices is used to reduce the current loss of photovoltaic modules and improve the performance of photovoltaic modules.

[0003] Chinese patent application 202210847388.3 provides a common internal circuit structure design of a multi-slice photovoltaic module. Figure 7 Figure 1 is a schematic diagram of the circuit structure of the multi-slice photovoltaic module. Figure 7 As shown, the cell string of the multi-slice photovoltaic module is divided into six cell string groups, each of which includes two parallel cell strings. The six cell string groups are divided into upper and lower parts by the middle bus bar in the horizontal direction (left and right direction in the figure). The three cell string groups in the upper part are respectively connected in parallel with the three cell string groups in the lower part. The three diodes used to prevent the hot spot effect from burning the cells are arranged on the horizontal middle bus bar, all of which are in or close to the middle area of ​​the length direction of the module (up and down direction in the figure). At present, the diodes are usually arranged in the junction box, and it is necessary to open a hole in the back plate of the photovoltaic module. The bus bar lead wire passes through the back plate opening and is connected to the junction box.

[0004] The inventors of the present invention have found that the openings on the back panel in the above solutions need to be located in the middle area of ​​the length direction where the stress of the back panel is the largest, which causes the back panel, especially the glass back panel of the double-glass module, to easily break from the openings, which will seriously affect the strength of the module. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a photovoltaic module that can disperse the diodes based on circuit optimization to avoid multiple openings being concentrated in the middle area of ​​the backplane in the length direction, thereby improving the strength of the module.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a photovoltaic module, comprising: a first battery part, wherein:

[0008] The first battery section includes:

[0009] A first end bus bar, a first middle bus bar and a second end bus bar are arranged in sequence along a first direction, and the length directions of the first end bus bar, the first middle bus bar and the second end bus bar are arranged along a second direction; a first battery string group having one end connected to the first end bus bar and the other end connected to the first middle bus bar; a second battery string group having one end connected to the first middle bus bar and the other end connected to the second end bus bar; a second battery string group having one end connected to the first end bus bar and the other end connected to the second end bus bar, and a second battery string group having one end connected to the first end bus bar and the other end connected to the second end bus bar, and a second battery string group having one end connected to the first middle bus bar and the other end connected to the first A first jumper busbar connected to the busbar; a first diode connected to the first jumper busbar and located between the first end busbar and the first middle busbar; and a second diode connected to the first jumper busbar and located between the second end busbar and the first middle busbar; the first battery string group and the second battery string group include an equal number of battery strings arranged along the first direction in length; the battery strings of the first battery string group are connected in parallel to each other, the battery strings of the second battery string group are connected in parallel to each other, and the first battery string group and the second battery string group are connected in series.

[0010] The technical solution of the embodiment of the present invention has the following advantages or beneficial effects:

[0011] By optimizing the circuit design of the photovoltaic module, the first battery unit and the second battery unit in the first battery part are adjusted to be in a series relationship, thereby supporting the dispersed arrangement of two bypass diodes on the first jumper bus in the first direction (the direction in which the battery string extends), so that the two bypass diodes are located away from the central area of ​​the backplane at the opening of the backplane, thereby improving the strength of the module and reducing or avoiding the risk of the backplane breaking from the opening.

[0012] Furthermore, the arrangement and welding methods of the busbars such as the first end busbar, the first middle busbar, the second end busbar, the third end busbar, the second middle busbar, the first jumper and the second jumper are optimized, so that the above busbars can be hidden on the back of the component without folding or only with a small amount of folding, thereby increasing the light-receiving area of ​​the component, improving the efficiency of the component, reducing the risk of hidden cracks caused by multiple folding of the busbars, and reducing the difficulty of the photovoltaic component manufacturing process.

[0013] The further effects of the above-mentioned non-conventional optional manner will be described below in conjunction with the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0015] Figure 1 is a schematic diagram of the circuit structure of an embodiment of the present invention;

[0016] Figure 2 is a schematic diagram of current flow in an embodiment of the present invention;

[0017] Figure 3 is a schematic diagram of busbar stacking according to an embodiment of the present invention;

[0018] Figure 4 is a schematic diagram of a busbar folding according to an embodiment of the present invention;

[0019] Figure 5a is a first welding schematic diagram of a first middle bus bar in an embodiment of the present invention;

[0020] Figure 5b is a second welding schematic diagram of the first middle bus bar in an embodiment of the present invention;

[0021] Figure 5c is a third welding schematic diagram of the first middle bus bar in an embodiment of the present invention;

[0022] Figure 5d is a first welding schematic diagram of the second middle bus bar in an embodiment of the present invention;

[0023] Figure 5e is a second welding schematic diagram of the second middle bus bar in an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of a heat conduction hole of a bus bar in an embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of the circuit structure of a photovoltaic module in the prior art.

[0026] Description of reference numerals:

[0027] 1-first battery part, 2-second battery part, 3-bus bar, 4-end bus bar area, 5-middle bus bar area of ​​the first battery part, 6-middle bus bar area of ​​the second battery part, 7-welding strip, 8-insulating strip, 10-first battery string group, 11-second battery string group, 20-third battery string group, 21-fourth battery string group, 30-first end bus bar, 31-first middle bus bar, 32-second end bus bar, 33-third end bus bar, 34-second middle bus bar, 35-first jumper bus bar, 36-second jumper bus bar, 90-first diode, 91-second diode, 92-third diode, 93-thermal via, 100-battery string, 1001-battery cell, A, B, C-contacts. DETAILED DESCRIPTION

[0028] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0029] First, the technical concept of the embodiment of the present invention is explained. At present, the photovoltaic field uses the multi-slicing technology of dividing the whole cell into multiple sliced ​​cells to reduce the current loss of photovoltaic modules and improve the performance of photovoltaic modules. The typical circuit structure is a longitudinal symmetrical structure, that is, the upper and lower symmetrical battery strings are arranged, and the upper battery string group is connected in parallel with the corresponding lower battery string group. The longitudinal direction can be called the first direction, which refers to the extension direction of the battery string, and is also the length direction of the photovoltaic module. The following second direction refers to the direction perpendicular or nearly perpendicular to the first direction. The nearly perpendicular direction can be quantified according to the actual situation, for example, quantified as an angle greater than 80 degrees and less than 100 degrees with the first direction. The second direction can be called the horizontal direction.

[0030] Chinese patent application 202210847388.3 provides a common internal circuit structure design of a multi-slice photovoltaic module. Figure 7 The figure is a schematic diagram of the circuit structure of the multi-slice photovoltaic module. The patented technical solution has a central bus bar arranged horizontally, and three battery strings are arranged on the upper and lower sides of the central bus bar. Figure 7 As shown, the three battery strings located at the top are the first battery string group, the second battery string group, and the third battery string group from left to right, and the three battery strings located at the bottom are the fourth battery string group, the fifth battery string group, and the sixth battery string group from left to right. The negative electrode of the first battery string group, the negative electrode of the fourth battery string group, the positive electrode of the second battery string group, the positive electrode of the fifth battery string group, the positive electrode of the third battery string group, and the positive electrode of the sixth battery string group are connected to the middle bus bar, and the positive electrode of the first battery string group and the positive electrode of the fourth battery string group are connected in parallel through the first jumper bus bar, and the negative electrode of the second battery string group and the negative electrode of the fifth battery string group are also connected in parallel through the first jumper bus bar, and the negative electrode of the third battery string group and the negative electrode of the sixth battery string group are connected in parallel through the second jumper bus bar. At the same time, in order to prevent the hot spot effect of the photovoltaic module from causing the battery cell to burn, three diodes are also set.

[0031] You can consider Figure 7The two vertical jumper busbars or the horizontal middle busbar can be installed. For the first jumper busbar on the left, it is not suitable to install diodes because the electrode polarity arrangement of the battery strings on the left and right is different; the second jumper busbar on the right is used to flow normal working current, and installing diodes will disconnect the circuit, which is also not suitable for installing diodes. Therefore, diodes can only be installed on the horizontal middle busbar. Taking into account the protection range of the battery string and the generally cramped horizontal space of the photovoltaic module, the final diode installation position is often concentrated in the middle area of ​​the length direction of the module. At present, the diode is usually set in the junction box, and it is necessary to open a hole in the back panel of the photovoltaic module. The bus lead wire passes through the back panel opening and is connected to the junction box.

[0032] This means that the above solution requires opening a hole in the middle area of ​​the length direction where the stress of the backplane is the greatest to achieve connection with the diode, causing the backplane, especially the glass backplane of the double-glass module, to easily break from the opening, which will more seriously affect the strength of the module.

[0033] In view of the above defects of the prior art, the embodiment of the present invention optimizes the circuit structure of the photovoltaic module, changes the full parallel mode of the upper and lower battery units into a series-parallel combination mode, that is, the first battery part is designed to be connected in series, and the second battery part is designed to be connected in parallel, so that the diodes can be dispersedly arranged for the upper and lower battery units (such as the first battery string group and the second battery string group) at the position where the longitudinal bus bar (such as the first jumper bus bar) leaves the middle area of ​​the module, thereby changing the position of the back plate opening, and opening the lead hole of the conventional aperture at the position away from the middle area of ​​the length direction of the back plate, thereby improving the strength of the module, reducing or avoiding the risk of the back plate breaking from the opening, especially for photovoltaic modules using glass back plates, which can greatly improve the strength of the back plate. In addition, the sealing performance of the module can be improved, and the risk of water vapor intrusion from the opening can be reduced. The above conventional aperture refers to the aperture used to set a single diode, and the above middle area can be quantified according to actual needs, for example, quantified as a circular area with the center point of the back plate as the center and a preset distance as the radius, or a square area with the center point of the back plate as the center and a preset distance as the side length.

[0034] Furthermore, the inventors of the present invention have also found that in the prior art, busbars are generally arranged on the front side of the battery string, and the busbar area on the front side will reduce the light-receiving area of ​​the module, thereby affecting the module efficiency. In view of the above defects, the embodiments of the present invention optimize the arrangement and welding methods of the first end busbar, the first middle busbar, the second end busbar, the third end busbar, the second middle busbar, the first jumper and the second jumper, so that the above busbars do not need to be folded or only need to be folded slightly to be hidden on the back side of the module, thereby increasing the light-receiving area of ​​the module, improving the module efficiency, reducing the risk of hidden cracks caused by multiple folding of the busbars, and reducing the difficulty of photovoltaic module manufacturing process.

[0035] It is worth noting that the terms "first", "second", etc. included in the embodiments of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific number or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances. This is merely a way of distinguishing objects with the same attributes when describing the embodiments of the present invention. It should be pointed out that the embodiments of the present invention and the technical features therein can be combined with each other without conflict.

[0036] An embodiment of the present invention provides a photovoltaic module, which includes a first battery part 1 . Figure 1 is a schematic diagram of the circuit structure of the photovoltaic module provided by the embodiment of the present invention, see Figure 1 , the first battery part 1 comprises:

[0037] The first end bus bar 30, the first middle bus bar 31 and the second end bus bar 32 are arranged in sequence along the first direction, and the length direction of the first end bus bar 30, the first middle bus bar 31 and the second end bus bar 32 is arranged along the second direction. A first battery string group 10 having one end connected to the first end bus bar 30 and the other end connected to the first middle bus bar 31. A second battery string group 11 having one end connected to the first middle bus bar 31 and the other end connected to the second end bus bar 32. A first jumper bus bar 35 having one end connected to the first end bus bar 30 and the other end connected to the second end bus bar 32, and the middle part also connected to the first middle bus bar 30. A first diode 90 connected to the first jumper bus bar 35 and located between the first end bus bar 30 and the first middle bus bar 31. And, a second diode 91 connected to the first jumper bus bar 35 and located between the second end bus bar 32 and the first middle bus bar 31 .

[0038] The first battery string group 10 and the second battery string group 11 include an equal number of battery strings 100 arranged along the first direction in length. The battery strings 100 of the first battery string group 10 are connected in parallel, the battery strings 100 of the second battery string group 11 are connected in parallel, and the first battery string group 10 and the second battery string group 11 are connected in series.

[0039] It can be understood that the first battery string group 10 and the second battery string group 11 can be arranged along the first direction, that is, arranged up and down, that is, the part of the first battery part 1 above the first middle bus bar 31 is the first battery string group 10, and the part below the first middle bus bar 31 is the second battery string group 11. The battery strings 100 of the first battery string group 10 and the second battery string group 11 can form a one-to-one correspondence up and down. The battery strings in the same battery string group are equal in length, and the battery string length refers to the number of batteries contained in the battery string 100. Preferably, the first battery string group 10 and the second battery string group 11 have equal battery string lengths; in other embodiments, the battery string lengths of the first battery string group 10 and the second battery string group 11 may also be different.

[0040] The first battery string group 10 and the second battery string group 11 share the first middle bus bar 31. The battery strings 100 in the first battery string group 10 are connected in parallel based on the first middle bus bar 31 and the first end battery bus bar 30, and the battery strings 100 in the second battery string group 11 are connected in parallel based on the first middle bus bar 31 and the second end bus bar 32.

[0041] One end of the first jumper bus bar 35 intersects with the first end bus bar 30 at a junction A, the other end intersects with the second end bus bar 32 at a junction C, and the middle portion intersects with the first middle bus bar 31 at a junction B.

[0042] In a preferred embodiment, the first jumper bus bar 35 vertically divides the first battery string group 10 and the second battery string group 11 equally, that is, the left and right sides of the first jumper bus bar 35 have equal numbers of battery strings 100. In other embodiments, the number of battery strings on the left and right sides of the first jumper bus bar 35 may also be different. The first battery string group 10 may include four battery strings 100, and two strings are arranged on the left and right sides of the first jumper bus bar 35. The second battery string group 11 may also include four battery strings 100, and two strings are arranged on the left and right sides of the first jumper bus bar 35.

[0043] The first diode 90 and the second diode 91 are arranged on both sides of the junction B. The first diode 90 is used to protect each battery string 100 of the first battery string group 10, and the second diode 91 is used to protect each battery string 100 of the second battery string group 11. There is no strict restriction on the positions of the first diode 90 and the second diode 91 on the first jumper bus 35. The first diode 90 can be arranged close to the first end bus 30, and the second diode 91 can be arranged close to the second end bus 32, so that the first diode 90 and the second diode 91 are arranged in a dispersed manner and do not need to be arranged in the middle position of the photovoltaic module. Accordingly, the back plate of the photovoltaic module is provided with a first hole (not shown in the figure) at the corresponding position of the first diode 90, and a second hole (not shown in the figure) at the corresponding position of the second diode 91, and the apertures of the first hole and the second hole are both regular apertures.

[0044] It can be understood that the first jumper busbar 35 is disconnected at the position of the first diode 90 to form two lead-out ends, which are connected to the junction box after passing through the first hole, thereby realizing the setting of the first diode 90. Similarly, the first jumper busbar 35 is disconnected at the position of the second diode 91 to form two lead-out ends, which are connected to the junction box after passing through the second hole, thereby realizing the setting of the second diode 91.

[0045] In this way, by designing the upper and lower battery strings of the first battery part 1 to be connected in series, two diodes can be dispersedly arranged on the longitudinal first jumper busbar 35. Based on the above circuit structure, the upper and lower sides of the first jumper busbar 35 are suitable for installing diodes to protect the upper and lower battery strings respectively, and the first jumper 35 does not pass normal working current and has sufficient space to stay away from the middle area of ​​the component, so that the two diodes are away from the center area of ​​the back plate at the opening position of the back plate, thereby improving the strength of the component and reducing or avoiding the risk of the back plate breaking from the opening.

[0046] In an optional technical solution, the first jumper bus bar 35 may also be connected to at least one bypass diode located between the connection point A and the connection point B (these bypass diodes do not include the first diode 90), and / or at least one bypass diode located between the connection point B and the connection point C (these bypass diodes do not include the second diode 91), to reduce the loss caused by the photovoltaic module being blocked. The above at least one bypass diode (referring to the bypass diode between the connection point A and the first connection point B and the bypass diode between the first connection point B and the connection point C) is not located in the middle area of ​​the backplane at the corresponding position of the backplane, so that the corresponding backplane opening is not in the central area of ​​the backplane, thereby ensuring the strength and sealing performance of the module.

[0047] In the embodiment of the present invention, the positive electrode of the battery string 100 of the first battery string group 10 is connected to the first middle bus bar 31, and the negative electrode is connected to the first end bus bar 30, and the negative electrode of the battery string 100 of the second battery string group 11 is connected to the first middle bus bar 31, and the positive electrode is connected to the second end bus bar 32. In the embodiment of the present invention, the positive and negative electrodes can be interchangeable.

[0048] Furthermore, in the embodiment of the present invention, other battery parts, such as the second battery part 2, may be provided to match with the first battery part to meet different current, voltage and power requirements.

[0049] like Figure 1 As shown, the first battery section 1 can be connected in series with the second battery section 2. The first battery section 1 and the second battery section 2 can be arranged along the second direction, that is, arranged left and right. Figure 1 The first battery part 1 is located on the right side of the second battery part 2. In practical applications, the first battery part 1 can also be located on the left side of the second battery part 2 (eg Figure 3 ). The second end bus bar 32 may extend to the second battery portion 2 , and the first battery portion 1 and the second battery portion 2 are connected in series via the second end bus bar 32 .

[0050] like Figure 1 As shown, the second battery part 2 may include: a third end bus bar 33 and a second middle bus bar 34 arranged along the second direction in length, the third end bus bar 33, the second middle bus bar 34 and the second end bus bar 32 are arranged in sequence along the first direction, and the three are substantially parallel. A third battery string group 20 connected to the third end bus bar 33 at one end and the second middle bus bar 34 at the other end; a fourth battery string group 21 connected to the second middle bus bar 31 at one end and the second end bus bar 32 at the other end; a second jumper bus bar 36 connected to the third end bus bar 33 at one end and the second end bus bar 32 at the other end, and also connected to the second middle bus bar 34 in the middle; and a third diode 92 arranged on the second middle bus bar 34.

[0051] The third battery string group 20 and the fourth battery string group 21 include an equal number of battery strings 100 arranged in a first direction in length. The battery strings 100 of the third battery string group 20 are connected in parallel with each other, and the battery strings 100 of the fourth battery string group 21 are connected in parallel with each other. The third battery string group 20 and the fourth battery string group 21 are connected in parallel.

[0052] In the embodiment of the present invention, the third battery string group 20 and the fourth battery string group 21 can be arranged along the first direction, that is, arranged up and down, that is, the part of the second battery part 2 above the second middle bus bar 34 is the third battery string group 20, and the part below the second middle bus bar 34 is the fourth battery string group 21. The third battery string group 20 and the fourth battery string group 21 can include an equal number of battery strings 100, forming a one-to-one correspondence between the upper and lower battery strings. The battery strings in the same battery string group are equal in length, and the battery strings of the third battery string group 20 and the fourth battery string group 21 are also equal in length.

[0053] The third battery string group 20 may include two battery strings 100 , and the fourth battery string group 21 may include two battery strings 100 .

[0054] Specifically, the battery strings 100 in the third battery string group 20 are connected in parallel based on the third end bus bar 33 and the second middle bus bar 34 extending along the second direction, and the battery strings 100 in the fourth battery string group 21 are connected in parallel based on the second end bus bar 32 and the second middle bus bar 34 .

[0055] The second jumper bus bar 36 may be disposed in the second battery portion 2 at a side close to the first battery portion 1 .

[0056] In the embodiment of the present invention, the positive electrode of the battery string 100 of the third battery string group 20 is connected to the second middle bus bar 34, and the negative electrode is connected to the third end bus bar 33; the positive electrode of the battery string 100 of the fourth battery string group 21 is connected to the second middle bus bar 34, and the negative electrode is connected to the second end bus bar 32. The positive and negative electrodes can be interchangeable.

[0057] In the embodiment of the present invention, the back plate is provided with a third hole at the position corresponding to the third diode 92, and the aperture of the third hole can be a conventional aperture. It can be understood that the second middle bus bar 34 is disconnected at the position of the third diode 92 to form two lead-out ends, and the two lead-out ends are connected to the junction box after passing through the third hole, thereby realizing the setting of the third diode 92. The third diode 92 is used to protect each battery string 100 of the third battery string group 20 and the fourth battery string group 21.

[0058] In one embodiment, the battery strings 100 in the first battery string group 10, the second battery string group 11, the third battery string group 20 and the fourth battery string group 21 may have an equal number of battery cells, and the batteries 1001 in the same battery string are arranged with positive spacing, zero spacing or negative spacing, preferably with negative spacing. The battery 1001 in the battery string of the photovoltaic module may be a whole battery cell, or a sliced ​​battery cell formed by cutting a whole battery cell, and laser cutting may be used, and the number of cuts is greater than or equal to 2, preferably 3 or 4, and each battery cell 1001 formed after cutting has a positive electrode and a negative electrode. The present invention does not limit the types of batteries, and the battery types may include Passivated Emitter Rear Cell (PERC), Tunnel Oxide Passivated Contact (TOPCon), Heterojunction with Intrinsic Thin-film (HJT), Interdigitated Back Contact (IBC), Perovskite battery, Multi-busbar battery MBB, Busbarless battery (0BB), etc. Figure 1 The current flow of the circuit is as follows Figure 2 shown.

[0059] The combination of the first battery part 1 and the second battery part 2 enables the photovoltaic module to generate the required voltage, current and power. As a preferred solution, considering the series relationship between the first battery part 1 and the second battery part 2 and the series connection in the first battery part 1 and the parallel connection in the second battery part 2, in order to ensure that the current of the first battery part 1 and the second battery part 2 are equal, the number of battery strings in the first battery string group 10 can be configured to be twice the number of battery strings in the third battery string group 20, for example Figure 1 The two cell string groups of the first cell section 1 shown have four cell strings each, and the two cell string groups of the second cell section 2 have two cell strings each. In one embodiment, the second cell section 2 is located at the edge of the photovoltaic module because it contains fewer cell strings.

[0060] The busbar stacking in photovoltaic modules is as follows Figure 3 As shown, the first end bus bar 30, the second end bus bar 32 and the third end bus bar 33 are welded on the circuit board to form an end bus bar area 4, the first middle bus bar 31 is welded on the circuit board to form a middle bus bar area 5 of the first battery part, and the second middle bus bar 34 is welded on the circuit board to form a middle bus bar area 6 of the second battery part.

[0061] The following describes the arrangement and welding method of each busbar 3 according to an embodiment of the present invention, which enables the busbar 3 to be hidden on the back of the component without folding or with only a small amount of folding, thereby increasing the light-receiving area of ​​the component, improving the efficiency of the component, and reducing the risk of hidden cracks caused by multiple folding of the busbar.

[0062] Regarding the arrangement and welding method of the first middle bus bar 31 .

[0063] exist Figure 5a , Figure 5b , Figure 5c In the figure, the extension direction of the battery string is perpendicular to the extension direction of the first middle bus bar 31. The first middle bus bar 31 shown in the figure is a cross-section, and the upper surface of the battery in the figure corresponds to the back side of the battery string, and the lower surface of the battery in the figure corresponds to the front side of the battery string.

[0064] For ease of description, the battery cell near one end of the first middle bus bar 31 in the battery string 100 of the first battery string group 10 is called a first end battery cell, and the battery cell near one end of the first middle bus bar 31 in the battery string 100 of the second battery string group 11 is called a second end battery cell. In the embodiment of the present invention, the first battery string group 10 and the second battery string group 11 are connected in series, so the electrode of the first end battery cell connected to the first middle bus bar 31 and the corresponding electrode of the second end battery cell connected to the first middle bus bar 31 have opposite polarities.

[0065] like Figure 5a and Figure 5c As shown, the first battery string group 10 and the second battery string group 11 are two independent battery strings. A first electrode lead-out welding strip is provided on the first end battery sheet, and a second electrode lead-out welding strip is provided on the second end battery sheet. Both the first electrode lead-out welding strip and the second electrode lead-out welding strip are connected to the first intermediate bus bar 31, and the first intermediate bus bar 31 is located on the back of the first end battery sheet or the second end battery sheet.

[0066] exist Figure 5a In the case shown, the first electrode lead-out ribbon is located on the back side of the first end battery cell and extends to the edge of the first end battery cell, the second electrode lead-out ribbon is located on the front side of the second end battery cell and extends to the back side of the first end battery cell, and the first intermediate bus bar 31 is located between the first electrode lead-out ribbon and the second electrode lead-out ribbon.

[0067] That is, after the first electrode lead-out welding strip is welded to the first end battery cell, it is cut short to be flush with the edge of the first end battery cell, and then the first middle bus bar 31 is welded to the first electrode lead-out welding strip. Then, the second electrode lead-out welding strip is welded to the front side of the second end battery cell and then extended to the back side of the first end battery cell and welded to the first middle bus bar 31.

[0068] exist Figure 5c In the case shown, the first electrode lead-out welding strip is located on the back side of the first end battery cell and extends to the edge of the first end battery cell, the second electrode lead-out welding strip is located on the front side of the second end battery cell and extends to the back side of the first end battery cell, and the second electrode lead-out welding strip is located between the first middle bus bar 31 and the first electrode lead-out welding strip.

[0069] That is, after the first electrode lead-out welding strip is welded to the first end battery cell, it is cut short to be flush with the edge of the first end battery cell, and then the second electrode lead-out welding strip is welded to the front side of the second end battery cell and then extended to the back side of the first end battery cell and welded to the first electrode lead-out welding strip, and then the first middle bus bar 31 is welded on the first electrode lead-out welding strip.

[0070] like Figure 5b As shown, each battery string 100 of the first battery string group 10 and the corresponding battery string 100 of the second battery string group 11 are a complete long battery string. The first end battery cell in the battery string 100 of the first battery string group 10 and the second end battery cell in the battery string 100 of the second battery string group 11 are connected by a connecting welding strip. It can be understood that one end of the connecting welding strip is located on the front of the first end battery cell (or the second end battery cell), and the other end is located on the back of the second end battery cell (or the first end battery cell). The first intermediate bus bar 31 is connected to the portion of the connecting welding strip located on the back of the battery string 100.

[0071] Optionally, edges of the first end cell sheet and the second end cell sheet overlap.

[0072] In summary, it can be seen that the first middle bus bar 31 can be hidden at the back of the battery string without being folded in various situations.

[0073] Regarding the arrangement and welding method of the second middle bus bar 34 .

[0074] exist Figure 5d and Figure 5e In the figure, the extension direction of the battery string is perpendicular to the extension direction of the second middle bus bar 34. The second middle bus bar 34 shown in the figure is a cross-section, and the upper surface of the battery in the figure corresponds to the back side of the battery string, and the lower surface of the battery in the figure corresponds to the front side of the battery string.

[0075] For ease of description, the battery cell near one end of the second middle bus bar 34 in the battery string 100 of the third battery string group 20 is called a third end battery cell, and the battery cell near one end of the second middle bus bar 34 in the battery string 100 of the fourth battery string group 21 is called a fourth end battery cell. In the embodiment of the present invention, the third battery string group 20 and the fourth battery string group 21 are connected in parallel, so the electrode of the third end battery cell connected to the second middle bus bar 34 has the same polarity as the electrode of the corresponding fourth end battery cell connected to the second middle bus bar 34.

[0076] like Figure 5d In the case shown, the front side of the third end cell is provided with a third electrode lead-out welding strip and extends to the back side of the fourth end cell, and is connected to the second intermediate bus bar 34. The front side of the fourth end cell is provided with a fourth electrode lead-out welding strip and extends to the back side of the third end cell, and is connected to the second intermediate bus bar 34. An insulating strip 8 is provided between the third electrode lead-out welding strip and the fourth end cell, and between the fourth electrode lead-out welding strip and the third end cell.

[0077] That is, an insulating strip 8 is laid on the back side of the third end battery cell and the back side of the fourth end battery cell, one end of the third electrode lead-out welding strip is welded to the front side of the third end battery cell, and the other end extends to the back side of the fourth end battery cell and overlaps the insulating strip 8, one end of the fourth electrode lead-out welding strip is welded to the front side of the fourth end battery cell, and the other end extends to the back side of the third end battery cell and overlaps the insulating strip 8, and then the second middle bus bar 34 is welded to the third electrode lead-out welding strip and the fourth electrode lead-out welding strip.

[0078] like Figure 5e In the situation shown, a third electrode lead-out welding strip is provided on the back side of the third end battery cell and extends beyond the edge of the third end battery cell to be connected to the second intermediate bus bar 34; a fourth electrode lead-out welding strip is provided on the back side of the fourth end battery cell and extends beyond the edge of the fourth end battery cell to be connected to the second intermediate bus bar 34.

[0079] That is, the third electrode lead-out ribbon is welded to the back side of the third end battery cell and shortened to slightly exceed the edge of the third end battery cell, the fourth electrode lead-out ribbon is welded to the back side of the fourth end battery cell and shortened to slightly exceed the edge of the third end battery cell, and then the second middle bus bar 34 is welded to the third electrode lead-out ribbon and the fourth electrode lead-out ribbon.

[0080] In summary, it can be known that the second middle bus bar 34 can be hidden at the back of the battery string without being folded by the above method.

[0081] Regarding the arrangement and welding method of the first end bus bar 30 , the second end bus bar 32 and the third end bus bar 33 .

[0082] The above-mentioned end bus bar 3 is hidden in the back of the battery string in the same way. Figure 4 As shown, an electrode lead-out welding strip is provided on the battery cell at one end of the battery string 100 close to the end bus bar 3 .

[0083] If the electrode lead-out welding strip is located on the back of the battery string 100, the electrode lead-out welding strip is welded to the back of the end battery cell and then cut short to be flush with the edge of the end battery cell, and then the end bus bar 3 is welded to the electrode lead-out welding strip.

[0084] If the electrode lead-out welding strip is located on the front side of the battery string 100, the electrode lead-out welding strip is welded to the front side of the end battery cell, and then the end bus bar 3 is welded to the electrode lead-out welding strip, and the end bus bar 3 is folded to the back side of the battery string 100 by bending the electrode lead-out welding strip, so as to hide the end bus bar to the back side of the battery string. In this case, an insulating strip 8 is provided between the end bus bar 3 and the back side of the battery string 100.

[0085] In the embodiment of the present invention, the first jumper bus bar 35 and the second jumper bus bar 36 are also arranged on the back of the battery string 100. The first jumper bus bar 35 is routed on the back of the battery string and is welded with the first end bus bar 30, the first middle bus bar 31 and the second end bus bar 32 on the back of the battery string; the second jumper bus bar 36 is routed on the back of the battery string and is welded with the third end bus bar 33, the second middle bus bar 34 and the second end bus bar 32 on the back of the battery string, thereby realizing the arrangement of two jumper bus bars on the back of the battery string.

[0086] See also Figure 6 Preferably, the first end bus bar 30, the first middle bus bar 31, the second end bus bar 32, the third end bus bar 33, the second middle bus bar 34, the first jumper bus bar 35 and the second jumper bus bar 36 may have one or more heat conduction holes 93 in the welding area with the welding ribbon 7 to enhance the heat transfer during welding and improve the welding effect of the bus bar 3 and the welding ribbon 7. The above heat conduction holes 93 may be arranged at equal intervals in a predetermined direction.

[0087] In summary, the embodiments of the present invention provide the following technical solutions:

[0088] Technical Solution 1. A photovoltaic module, characterized in that it comprises: a first battery part 1, wherein the first battery part 1 comprises:

[0089] A first end bus bar 30, a first middle bus bar 31 and a second end bus bar 32 are sequentially arranged along a first direction, and the length directions of the first end bus bar 30, the first middle bus bar 31 and the second end bus bar 32 are arranged along a second direction;

[0090] A first battery string group 10 having one end connected to the first end bus bar 30 and the other end connected to the first middle bus bar 31;

[0091] A second battery string group 11 having one end connected to the first middle bus bar 31 and the other end connected to the second end bus bar 32;

[0092] A first jumper bus 35 having one end connected to the first end bus 30 , the other end connected to the second end bus 32 , and the middle part also connected to the first middle bus 30 ;

[0093] a first diode 90 connected to the first jumper bus bar 35 and located between the first end bus bar 30 and the first middle bus bar 31; and,

[0094] a second diode 91 connected to the first jumper bus bar 35 and located between the second end bus bar 32 and the first middle bus bar 31;

[0095] The first battery string group 10 and the second battery string group 11 include an equal number of battery strings 100 whose length directions are arranged along the first direction;

[0096] The battery strings 100 of the first battery string group 10 are connected in parallel with each other, the battery strings 100 of the second battery string group 11 are connected in parallel with each other, and the first battery string group 10 and the second battery string group 11 are connected in series.

[0097] Technical Solution 2. The photovoltaic module according to Technical Solution 1 is characterized in that the first battery string group 10 includes four battery strings 100, and the second battery string group 11 includes four battery strings 100.

[0098] Technical Solution 3. The photovoltaic module according to Technical Solution 1 is characterized in that the same number of battery strings 100 of the first battery string group 10 are respectively arranged on both sides of the first jumper bus bar 35, and the same number of battery strings 100 of the second battery string group 11 are respectively arranged on both sides of the first jumper bus bar 35.

[0099] Technical Solution 4. The photovoltaic module according to Technical Solution 1 is characterized in that the positive electrode of the battery string 100 of the first battery string group 10 is connected to the first middle bus bar 31, and the negative electrode is connected to the first end bus bar 30;

[0100] The negative electrode of the battery string 100 of the second battery string group 11 is connected to the first middle bus bar 31 , and the positive electrode is connected to the second end bus bar 32 .

[0101] Technical Solution 5. The photovoltaic component according to Technical Solution 1 is characterized in that the second direction is perpendicular to the first direction.

[0102] Technical Solution 6. The photovoltaic module according to any one of Technical Solutions 1-5 is characterized in that the photovoltaic module also includes a second battery part 2 connected in series with the first battery part 1.

[0103] Technical Solution 7. The photovoltaic assembly according to Technical Solution 6 is characterized in that the second end bus bar 32 extends to the second battery portion 2;

[0104] The second battery part 2 comprises:

[0105] A third end bus bar 33 and a second middle bus bar 34 are arranged along the second direction in length, and the third end bus bar 33, the second middle bus bar 34 and the second end bus bar 32 are arranged in sequence along the first direction;

[0106] A third battery string group 20 having one end connected to the third end bus bar 33 and the other end connected to the second middle bus bar 34;

[0107] A fourth battery string group 21 having one end connected to the second middle bus bar 31 and the other end connected to the second end bus bar 32;

[0108] A second jumper bus 36 having one end connected to the third end bus 33, the other end connected to the second end bus 32, and the middle connected to the second middle bus 34; and,

[0109] a third diode 92 disposed on the second middle bus bar 34;

[0110] The third battery string group 20 and the fourth battery string group 21 include an equal number of battery strings 100 whose length directions are arranged along the first direction;

[0111] The battery strings 100 of the third battery string group 20 are connected in parallel with each other, the battery strings 100 of the fourth battery string group 21 are connected in parallel with each other, and the third battery string group 20 and the fourth battery string group 21 are connected in parallel.

[0112] Technical Solution 8. The photovoltaic assembly according to Technical Solution 7 is characterized in that the third battery string group 20 includes two battery strings 100 , and the fourth battery string group 21 includes two battery strings 100 .

[0113] Technical Solution 9. The photovoltaic module according to Technical Solution 7 is characterized in that the positive electrode of the battery string 100 of the third battery string group 20 is connected to the second middle bus bar 34, and the negative electrode is connected to the third end bus bar 33;

[0114] The positive electrode of the battery string 100 of the fourth battery string group 21 is connected to the second middle bus bar 34 , and the negative electrode is connected to the second end bus bar 32 .

[0115] Technical Solution 10. The photovoltaic assembly according to Technical Solution 7 is characterized in that the photovoltaic assembly also includes a back plate, which has a first hole at a position corresponding to the first diode 90, a second hole at a position corresponding to the second diode 91, and a third hole at a position corresponding to the third diode 92.

[0116] Technical Solution 11. The photovoltaic module according to Technical Solution 7 is characterized in that the battery string 100 includes a plurality of battery cells 1001 , and the plurality of battery cells 1001 are connected in series via welding strips 7 .

[0117] Technical Solution 12. The photovoltaic module according to Technical Solution 11 is characterized in that, for any end bus bar 3 of the first end bus bar 30, the second end bus bar 32 and the third end bus bar 33, an electrode lead-out welding strip is provided on the battery cell at one end of the battery string 100 close to the end bus bar 3,

[0118] If the electrode lead-out welding strip is located on the back side of the battery string 100, the end bus bar 3 and the electrode lead-out welding strip are welded on the back side of the battery string 100;

[0119] If the electrode lead-out welding strip is located on the front side of the battery string 100, the end of the end bus bar 3 is welded to the electrode lead-out welding strip on the front side of the battery string 100 and folded to the back side of the battery string 100, and an insulating strip 8 is arranged between the end bus bar 3 and the back side of the battery string 100.

[0120] Technical Solution 13. The photovoltaic module according to Technical Solution 11 is characterized in that the battery cell close to one end of the first intermediate bus bar 31 in the battery string 100 of the first battery string group 10 is a first end battery cell, and the battery cell close to one end of the first intermediate bus bar 31 in the battery string 100 of the second battery string group 11 is a second end battery cell;

[0121] The first end battery cell is provided with a first electrode lead-out welding strip, and the second end battery cell is provided with a second electrode lead-out welding strip. The first electrode lead-out welding strip and the second electrode lead-out welding strip are both connected to the first intermediate bus bar 31, and the first intermediate bus bar 31 is located on the back side of the first end battery cell or the second end battery cell.

[0122] Technical Solution 14. The photovoltaic module according to Technical Solution 13 is characterized in that the first electrode lead-out welding strip is located on the back side of the first end battery cell and extends to the edge of the first end battery cell, the second electrode lead-out welding strip is located on the front side of the second end battery cell and extends to the back side of the first end battery cell, and the first intermediate bus bar 31 is located between the first electrode lead-out welding strip and the second electrode lead-out welding strip.

[0123] Technical Solution 15. The photovoltaic module according to Technical Solution 13 is characterized in that the first electrode lead-out welding band is located on the back side of the first end battery cell and extends to the edge of the first end battery cell, the second electrode lead-out welding band is located on the front side of the second end battery cell and extends to the back side of the first end battery cell, and the second electrode lead-out welding band is located between the first intermediate bus bar 31 and the first electrode lead-out welding band.

[0124] Technical Solution 16. The photovoltaic module according to Technical Solution 11 is characterized in that the battery cell close to one end of the first intermediate bus bar 31 in the battery string 100 of the first battery string group 10 is a first end battery cell, and the battery cell close to one end of the first intermediate bus bar 31 in the battery string 100 of the second battery string group 11 is a second end battery cell;

[0125] The first end battery cell and the second end battery cell are connected via a connecting welding strip, and the first intermediate bus bar 31 is connected to a portion of the connecting welding strip located on the back side of the battery string 100 .

[0126] Technical Solution 17. The photovoltaic module according to Technical Solution 16 is characterized in that edges of the first end cell sheet and the second end cell sheet overlap.

[0127] Technical Solution 18. The photovoltaic module according to Technical Solution 11 is characterized in that the battery cell close to one end of the second intermediate bus bar 34 in the battery string 100 of the third battery string group 20 is a third end battery cell, and the battery cell close to one end of the second intermediate bus bar 34 in the battery string 100 of the fourth battery string group 21 is a fourth end battery cell;

[0128] A third electrode lead-out welding strip is provided on the front side of the third end battery cell and extends to the back side of the fourth end battery cell and is connected to the second middle bus bar 34;

[0129] A fourth electrode lead-out welding strip is provided on the front side of the fourth end battery cell and extends to the back side of the third end battery cell and is connected to the second middle bus bar 34;

[0130] An insulating strip 8 is provided between the third electrode lead-out welding strip and the fourth end battery cell, and between the fourth electrode lead-out welding strip and the third end battery cell.

[0131] Technical Solution 19. The photovoltaic module according to Technical Solution 11 is characterized in that the battery cell close to one end of the second intermediate bus bar 34 in the battery string 100 of the third battery string group 20 is a third end battery cell, and the battery cell close to one end of the second intermediate bus bar 34 in the battery string 100 of the fourth battery string group 21 is a fourth end battery cell;

[0132] A third electrode lead-out welding strip is disposed on the back of the third end battery cell and extends beyond the edge of the third end battery cell to be connected to the second middle bus bar 34;

[0133] A fourth electrode lead-out welding strip is disposed on the back side of the fourth end battery cell and extends beyond the edge of the fourth end battery cell to be connected to the second middle bus bar 34 .

[0134] Technical Solution 20. The photovoltaic module according to Technical Solution 7 is characterized in that the first jumper bus bar 35 is welded to the first end bus bar 30, the first middle bus bar 31 and the second end bus bar 32 on the back side of the battery string;

[0135] The second jumper bus bar 36 is welded to the third end bus bar 33 , the second middle bus bar 34 and the second end bus bar 32 on the back side of the battery string.

[0136] Technical Solution 21. The photovoltaic module according to Technical Solution 11 is characterized in that the battery strings 100 in the first battery string group 10, the second battery string group 11, the third battery string group 20 and the fourth battery string group 21 have an equal number of battery cells, and the battery cells 1001 in the same battery string 100 are arranged with positive spacing, zero spacing or negative spacing.

[0137] Technical Solution 22. The photovoltaic module according to Technical Solution 11 is characterized in that the cell 1001 is a sliced ​​cell formed by cutting a whole cell, and the number of cuts is greater than or equal to 2.

[0138] Technical Solution 23. The photovoltaic module according to Technical Solution 11 is characterized in that the number of cuts is 3 or 4.

[0139] Technical Solution 24. The photovoltaic module according to Technical Solution 11 is characterized in that the first end bus bar 30, the first middle bus bar 31, the second end bus bar 32, the third end bus bar 33, the second middle bus bar 34, the first jumper bus bar 35 and the second jumper bus bar 36 have one or more thermal conductive holes 93 in the welding area with the welding strip 7.

[0140] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A photovoltaic module, characterized in that: include: A first battery part (1), wherein The first battery part (1) comprises: A first end bus bar (30), a first middle bus bar (31), and a second end bus bar (32) arranged in sequence along a first direction, wherein the length directions of the first end bus bar (30), the first middle bus bar (31), and the second end bus bar (32) are arranged along a second direction; A first battery string group (10) having one end connected to the first end bus bar (30) and the other end connected to the first middle bus bar (31); A second battery string group (11) having one end connected to the first middle bus bar (31) and the other end connected to the second end bus bar (32); A first jumper bus bar (35) having one end connected to the first end bus bar (30), the other end connected to the second end bus bar (32), and the middle part also connected to the first middle bus bar (30); a first diode (90) connected to the first jumper bus bar (35) and located between the first end bus bar (30) and the first middle bus bar (31); and, a second diode (91) connected to the first jumper bus bar (35) and located between the second end bus bar (32) and the first middle bus bar (31); The first battery string group (10) and the second battery string group (11) comprise an equal number of battery strings (100) arranged along the first direction in length; The battery strings (100) of the first battery string group (10) are connected in parallel with each other, the battery strings (100) of the second battery string group (11) are connected in parallel with each other, and the first battery string group (10) and the second battery string group (11) are connected in series.

2. The photovoltaic module according to claim 1, characterized in that: The first battery string group (10) includes four battery strings (100), and the second battery string group (11) includes four battery strings (100).

3. The photovoltaic module according to claim 1, characterized in that: The first jumper bus bar (35) is provided with an equal number of battery strings (100) of the first battery string group (10) on both sides, and the first jumper bus bar (35) is provided with an equal number of battery strings (100) of the second battery string group (11) on both sides.

4. The photovoltaic module according to claim 1, characterized in that: The positive electrode of the battery string (100) of the first battery string group (10) is connected to the first middle bus bar (31), and the negative electrode is connected to the first end bus bar (30); The negative electrode of the battery string (100) of the second battery string group (11) is connected to the first middle bus bar (31), and the positive electrode is connected to the second end bus bar (32).

5. The photovoltaic module according to claim 1, characterized in that: The second direction is perpendicular to the first direction.

6. The photovoltaic module according to any one of claims 1 to 5, characterized in that: The photovoltaic module further comprises a second battery section (2) connected in series with the first battery section (1).

7. The photovoltaic module according to claim 6, characterized in that: The second end bus bar (32) extends to the second battery portion (2); The second battery part (2) comprises: a third end bus bar (33) and a second middle bus bar (34) arranged along the second direction in the length direction, the third end bus bar (33), the second middle bus bar (34) and the second end bus bar (32) being arranged in sequence along the first direction; A third battery string group (20) having one end connected to the third end bus bar (33) and the other end connected to the second middle bus bar (34); A fourth battery string group (21) having one end connected to the second middle bus bar (31) and the other end connected to the second end bus bar (32); A second jumper bus bar (36) having one end connected to the third end bus bar (33), the other end connected to the second end bus bar (32), and the middle connected to the second middle bus bar (34); and, a third diode (92) disposed on the second middle bus bar (34); The third battery string group (20) and the fourth battery string group (21) comprise an equal number of battery strings (100) arranged along the first direction in their length direction; The battery strings (100) of the third battery string group (20) are connected in parallel with each other, the battery strings (100) of the fourth battery string group (21) are connected in parallel with each other, and the third battery string group (20) and the fourth battery string group (21) are connected in parallel.

8. The photovoltaic module according to claim 7, characterized in that: The third battery string group (20) includes two battery strings (100), and the fourth battery string group (21) includes two battery strings (100).

9. The photovoltaic module according to claim 7, characterized in that: The positive electrode of the battery string (100) of the third battery string group (20) is connected to the second middle bus bar (34), and the negative electrode is connected to the third end bus bar (33); The positive electrode of the battery string (100) of the fourth battery string group (21) is connected to the second middle bus bar (34), and the negative electrode is connected to the second end bus bar (32).

10. The photovoltaic module according to claim 7, characterized in that: The photovoltaic assembly also includes a back plate, the back plate having a first hole at a position corresponding to the first diode (90), a second hole at a position corresponding to the second diode (91), and a third hole at a position corresponding to the third diode (92).

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