Photovoltaic module

Abstract

The utility model relates to the field of photovoltaic technology, in particular to a photovoltaic assembly, which comprises two battery string groups arranged in a mirroring manner, each battery string group comprises six battery strings arranged in parallel along a first direction, and the two battery string groups are connected with a jumper wire through an end bus bar and a middle bus bar. Each battery string group comprises two groups of three battery strings connected in parallel, the two groups of three battery strings connected in parallel are connected in series, and the two battery string groups are connected in parallel, so that the whole photovoltaic module comprises two groups of six battery strings connected in parallel. Compared with a common photovoltaic assembly in which six battery strings are connected in series to form a battery string group and two battery string groups are connected in parallel, the photovoltaic assembly provided by the utility model uses a plurality of fragmented battery pieces, the current in a single battery string is reduced, a copper solder strip with a smaller diameter can be used for transmitting the current, the use amount of copper is reduced, and the cost is reduced. The manufacturing cost of the photovoltaic module is reduced, the current loop is shortened, the power loss of the photovoltaic module is reduced, and the output power is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a photovoltaic component. Background Art

[0002] Photovoltaic modules are devices that convert solar energy into electrical energy by connecting a number of battery strings in series and in parallel. Common photovoltaic modules connect six battery strings in series to form a battery string group, and then connect two battery string groups in parallel to form a photovoltaic module. The battery string is made by connecting multiple two-piece battery cells with copper welding strips. In the above photovoltaic modules, the current in a single battery string is large, and a copper welding strip with a larger cross-sectional area is required to transmit the current. The amount of copper used is large, and the production cost of the photovoltaic module is high. In addition, the current loop is long after the six battery strings are connected in series, resulting in large power loss and low output power of the photovoltaic module. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a photovoltaic component.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] The utility model provides a photovoltaic component, which comprises: two battery string groups arranged in mirror image, each of the battery string groups comprises six battery strings arranged in parallel along a first direction, the electrodes of the three battery strings on one side of each battery string group are opposite to the electrodes of the three battery strings on the other side, and the battery string is composed of a plurality of multi-slice battery sheets connected in series; the ends of the two battery string groups that are away from each other along a second direction are each connected with an end bus bar, each of the end bus bar is connected to the six battery strings in each battery string group, and the two ends of a jumper are respectively connected to the middle of the two end bus bars; a middle bus bar is provided between the two battery string groups, the middle bus bar comprises a first bus bar segment connected to the three battery strings on one side of each battery string group and a second bus bar segment connected to the three battery strings on the other side of each battery string group, and lead-out ends are provided on the first bus bar segment and the second bus bar segment.

[0006] Further, each of the end busbars, the first busbar segment, and the second busbar segment includes a thickened segment and a non-thickened segment, and a cross-sectional area of ​​the thickened segment is greater than a cross-sectional area of ​​the non-thickened segment.

[0007] Furthermore, the cross-sectional area of ​​the lead-out end is greater than or equal to the cross-sectional area of ​​the thickened section.

[0008] Furthermore, the thickened section includes at least two layers of stacked busbars.

[0009] Furthermore, the thickened section of the end busbar is located in a middle region of the end busbar.

[0010] Further, the thickened sections of the first busbar segment and the second busbar segment are located in middle regions of the first busbar segment and the second busbar segment, or in end regions where the first busbar segment and the second busbar segment are close to each other.

[0011] In an optional embodiment of the utility model, the photovoltaic module also includes an integrated junction box, in which a positive terminal, a negative terminal, a second diode and a third diode are provided, the lead-out end includes a first lead-out end and a second lead-out end, the first lead-out end and the second lead-out end are respectively connected to the ends of the first busbar segment and the second busbar segment that are close to each other, the first lead-out end and the second lead-out end are connected to the positive terminal and the negative terminal; a lead end is provided in the middle of the jumper, the second diode is connected to the lead end and the first lead-out end, and the third diode is connected to the second lead-out end and the lead end.

[0012] Furthermore, a first diode is provided in the integrated junction box, and the first diode is connected to the second lead-out terminal and the first lead-out terminal.

[0013] In another optional embodiment of the utility model, the photovoltaic assembly also includes a positive junction box, a negative junction box and an intermediate junction box, the positive junction box is provided with a positive terminal, the negative junction box is provided with a negative terminal, and the intermediate junction box is provided with a second diode and a third diode; the lead-out terminal includes a first lead-out terminal, a second lead-out terminal, a third lead-out terminal and a fourth lead-out terminal; the first lead-out terminal and the second lead-out terminal are respectively connected to the middle parts of the first bus strip segment and the second bus strip segment, and the first lead-out terminal and the second lead-out terminal are connected to the positive terminal and the negative terminal; the third lead-out terminal and the fourth lead-out terminal are respectively connected to the ends of the first bus strip segment and the second bus strip segment that are close to each other, and a lead end is also provided in the middle of the jumper, the second diode is connected to the lead end and the third lead-out terminal, and the third diode is connected to the fourth lead-out terminal and the lead end.

[0014] Furthermore, the intermediate junction box further includes a first diode, and the first diode is connected to the fourth lead-out terminal and the third lead-out terminal.

[0015] Compared with the prior art, the utility model has achieved the following technical effects:

[0016] The utility model provides a photovoltaic module, including two battery string groups arranged in mirror image, each battery string group includes six battery strings arranged in parallel along a first direction, the two battery string groups are connected by an end busbar, a middle busbar and a jumper, so that each battery string group includes two groups of three parallel battery strings, the two groups of three parallel battery strings are connected in series, and the two battery string groups are connected in parallel, so that the entire photovoltaic module includes two groups of six parallel battery strings. Compared with the common photovoltaic module composed of six battery strings connected in series into one battery string group and two battery string groups connected in parallel, the photovoltaic module provided by the utility model uses multi-slice battery cells, the current in a single battery string is reduced, and a copper welding strip with a smaller diameter can be used to transmit current, thereby reducing the use of copper, reducing the production cost of the photovoltaic module, and the current loop is shortened, reducing the power loss of the photovoltaic module, and improving the output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the first installation position of the junction box in the first photovoltaic module of the utility model;

[0018] Figure 2 This is a schematic diagram of the second installation position of the junction box in the first photovoltaic module of the utility model;

[0019] Figure 3 It is a schematic diagram of the positional relationship between the end busbar, the middle busbar and the jumper in the first photovoltaic module of the utility model;

[0020] Figure 4 This is the first circuit connection diagram of the first photovoltaic module of the utility model;

[0021] Figure 5 This is the second circuit connection diagram of the first photovoltaic module of the utility model;

[0022] Figure 6 This is a schematic structural diagram of an end busbar in the utility model;

[0023] Figure 7 It is a schematic structural diagram of the first intermediate busbar and jumper in the first photovoltaic module of the utility model;

[0024] Figure 8 It is a schematic structural diagram of the second intermediate busbar and jumper in the first photovoltaic module of the utility model;

[0025] Fig. 9 It is a schematic structural diagram of the third intermediate busbar and jumper in the first photovoltaic module of the utility model;

[0026] Fig.10 This is a schematic diagram of the first installation position of the junction box in the second photovoltaic assembly of the utility model.

[0027] Among them: 10, battery string; 20, end busbar; 30, middle busbar; 31, first busbar section; 311, first lead-out terminal; 312, third lead-out terminal; 32, second busbar section; 321, second lead-out terminal; 322, fourth lead-out terminal; 40, jumper; 41, lead terminal; 50, integrated junction box; 51, first diode; 52, second diode; 53, third diode; 60, positive junction box; 70, negative junction box; 80, middle junction box; a, thickened section; b, non-thickened section. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] like Figure 1 and Figure 3As shown, the utility model provides a photovoltaic module, which includes: two battery string groups arranged in mirror image, each battery string group includes six battery strings 10 arranged in parallel along a first direction, the electrodes of the three battery strings 10 on one side of each battery string group are opposite to the electrodes of the three battery strings 10 on the other side, and the battery string 10 is composed of a plurality of multi-slice battery sheets connected in series; the ends of the two battery string groups away from each other along the second direction are each connected with an end bus bar 20, each end bus bar 20 is connected to the six battery strings 10 in each battery string group, and the two ends of the jumper 40 are respectively connected to the middle of the two end bus bar 20; a middle bus bar 30 is provided between the two battery string groups, and the middle bus bar 30 includes a first bus bar segment 31 connected to the three battery strings 10 on one side of each battery string group and a second bus bar segment 32 connected to the three battery strings 10 on the other side of each battery string group, and lead ends are provided on the first bus bar segment 31 and the second bus bar segment 32.

[0032] In the present invention, a multi-slice cell refers to three or more small cells that are equally divided from a complete cell, and each small cell is a multi-slice cell. For example, a complete cell is equally divided into four small cells, and each small cell is a four-slice cell. The end bus strap 20, the middle bus strap 30, the jumper 40 and the lead-out terminal are all made of bus straps. The end bus strap 20, the middle bus strap 30 and the jumper 40 transmit the current generated by the battery string 10 to the lead-out terminal, and the lead-out terminal is used to connect to the junction box. The two battery string groups are connected by the end bus strap 20, the middle bus strap 30 and the jumper 40, so that each battery string group includes two groups of three parallel battery strings 10, and the two groups of three parallel battery strings 10 are connected in series, and the two battery string groups are connected in parallel, so that the entire photovoltaic module includes two groups of six parallel battery strings 10, that is, the attached Figure 1 In the photovoltaic module, the six battery strings 10 on the left are connected in parallel, the six battery strings 10 on the right are connected in parallel, and the six battery strings 10 on the left are connected in series with the six battery strings 10 on the right. Compared with the common photovoltaic module in which six battery strings 10 are connected in series to form a battery string group and two battery string groups are connected in parallel, the photovoltaic module provided by the utility model has a reduced current in a single battery string, and can use a copper welding strip with a smaller diameter to transmit current, thereby reducing the use of copper, reducing the production cost of the photovoltaic module, and shortening the current loop, reducing the power loss of the photovoltaic module, and increasing the output power.

[0033] Taking a four-piece battery cell and a two-piece battery cell as an example, the current in the battery string 10 made of a four-piece battery cell and a two-piece battery cell made of a battery cell of the same specification is 1 / 2 of the current in the battery string 10 made of a two-piece battery cell. Therefore, compared with the battery string 10 made of a two-piece battery cell, the cross-sectional area of ​​the copper welding strip required for the battery string 10 made of a four-piece battery cell is reduced by half, and the amount of copper used can be reduced by half. According to the formula P=I 2 ·R, it can be seen that the battery string 10 reduces the power loss by 3 / 4, where P represents power, I represents current, and R represents internal resistance.

[0034] Recombination Figure 4 , Figure 7 In an optional embodiment of the utility model, the photovoltaic module further includes an integrated junction box 50, in which a positive terminal, a negative terminal, a second diode 52 and a third diode 53 are provided, and the lead-out terminal includes a first lead-out terminal 311 and a second lead-out terminal 321, which are respectively connected to the ends of the first busbar segment 31 and the second busbar segment 32 close to each other, and the first lead-out terminal 311 and the second lead-out terminal 321 are connected to the positive terminal and the negative terminal; a lead-out terminal 41 is provided in the middle of the jumper 40, and the second diode 52 is connected to the lead-out terminal 41 and the first lead-out terminal 311, and the third diode 53 is connected to the second lead-out terminal 321 and the lead-out terminal 41. The positive terminal, the negative terminal, the second diode 52 and the third diode 53 are installed in the integrated junction box 50, and the photovoltaic module has a simple structure and is easy to assemble.

[0035] Furthermore, a first diode 51 is further provided in the integrated junction box 50 , and the first diode 51 is connected to the second lead-out terminal 321 and the first lead-out terminal 311 .

[0036] like Figure 2 , Figure 3 , Figure 5 and Figure 8As shown, in another optional embodiment of the utility model, the photovoltaic assembly further includes a positive terminal box 60, a negative terminal box 70 and an intermediate terminal box 80, the positive terminal box 60 is provided with a positive terminal, the negative terminal box 70 is provided with a negative terminal, and the intermediate terminal box 80 is provided with a second diode 52 and a third diode 53; the lead-out terminal includes a first lead-out terminal 311, a second lead-out terminal 321, a third lead-out terminal 312 and a fourth lead-out terminal 322; the first lead-out terminal 311 and the second lead-out terminal 321 are respectively The first lead-out terminal 311 and the second lead-out terminal 321 are connected to the positive terminal and the negative terminal respectively; the third lead-out terminal 312 and the fourth lead-out terminal 322 are respectively connected to the ends of the first busbar segment 31 and the second busbar segment 32 close to each other; the middle of the jumper 40 is also provided with a lead end 41; the second diode 52 is connected to the lead end 41 and the third lead-out terminal 312; the third diode 53 is connected to the fourth lead-out terminal 322 and the lead end 41. In the photovoltaic module array, multiple photovoltaic modules are connected in series or in parallel, and there is a certain distance between the positive terminal box 60 and the negative terminal box 70, which can reduce the use of cables connected to the positive terminal box 60 and the negative terminal box 70.

[0037] Furthermore, the intermediate junction box 80 further includes a first diode 51 , and the first diode 51 is connected to the fourth lead-out terminal 322 and the third lead-out terminal 312 .

[0038] In the present invention, the second diode 52 and the third diode 53 are used to protect the circuit. When part of the battery strings in the photovoltaic module are blocked by shadows or fail to generate electricity, the second diode 52 or the third diode 53 will form a forward bias and conduct, and the current in the photovoltaic module bypasses the battery string 10 blocked by shadows or fails to generate electricity, and the current flows through the second diode 52 or the third diode 53, without affecting the normal power generation of other battery strings 10. The second diode 52 and the third diode 53 are connected in series, and the first diode 51 is connected in parallel with the second diode 52 and the third diode 53. In the photovoltaic array, when all the battery strings 10 in one of the photovoltaic modules cannot work normally and are turned on, if there are only the second diode 52 and the third diode 53 in the photovoltaic module, the current will pass through the second diode 52 and the third diode 53, and the second diode 52 and the third diode 53 will generate heat and cause large power loss. When the first diode 51 is connected, the current will pass through the first diode 5 instead of the second diode 52 and the third diode 53, which can reduce power loss.

[0039] like Figure 6-Figure 9As shown, in another optional embodiment of the utility model, each end bus strap 20, the first bus strap section 31 and the second bus strap section 32 include a thickened section a and a non-thickened section b, the cross-sectional area of ​​the thickened section a is greater than the cross-sectional area of ​​the non-thickened section b, and the cross-sectional area of ​​the lead-out end is greater than or equal to the cross-sectional area of ​​the thickened section a. In the photovoltaic module, the current magnitudes at different positions of the end bus strap 20, the first bus strap section 31 and the second bus strap section 32 are different, so the cross-sectional area requirements of the bus strap are also different, and the lead-out end gathers all the currents in the photovoltaic module. For example, the current magnitude in the end bus strap 20 decreases from the middle to both sides. In order to save the amount of copper used in the bus strap, the cross-sectional area of ​​the end bus strap 20 should decrease from the middle to both sides; in the first bus strap section 31 and the second bus strap section 32, the current of the part closer to the lead-out end connected to the positive and negative terminals in the junction box is larger. Taking into account the processing costs of the end bus strip 20, the first bus strip segment 31, and the second bus strip segment 32, the utility model uses a thickened bus strip to increase the cross-sectional area of ​​the bus strip that transmits a larger current. Preferably, the thickened section a includes at least two layers of superimposed bus strips, and the non-thickened section b is a single layer of bus strips. The thickened section a of the end bus strip 20 is located in the middle area of ​​the end bus strip 20. The thickened sections a of the first bus strip segment 31 and the second bus strip segment 32 are located in the middle area of ​​the first bus strip segment 31 and the second bus strip segment 32, or in the end area where the first bus strip segment 31 and the second bus strip segment 32 are close to each other.

[0040] like Fig.10 As shown, the second photovoltaic module provided by the utility model includes: two battery string groups connected in series, each battery string group includes six battery strings 10 arranged in parallel along a first direction, the electrodes of all the battery strings 10 in the two battery string groups are the same, and the battery strings 10 are composed of a plurality of multi-slice battery sheets connected in series; the ends of the two battery string groups away from each other along the second direction are each connected with an end bus bar 20, each end bus bar 20 is connected to the six battery strings 10 in each battery string group, and the two ends of the jumper 40 are respectively connected to the middle of the two end bus bars 20; a middle bus bar 30 is provided between the two battery string groups, the middle bus bar 30 is connected to all the battery strings 10 in the two battery string groups, and a lead-out terminal is provided on the jumper 40.

[0041] This specification uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A photovoltaic module, characterized in that: include: Two battery string groups arranged in mirror image, each of the battery string groups comprises six battery strings (10) arranged in parallel along a first direction, the electrodes of the three battery strings (10) on one side of each battery string group are opposite to the electrodes of the three battery strings (10) on the other side, and the battery string (10) is composed of a plurality of multi-slice battery sheets connected in series; the ends of the two battery string groups that are away from each other along a second direction are each connected to an end bus bar (20), each of the end bus bars (20) is connected to the six battery strings (10) in each battery string group, and a jumper wire The two ends of the (40) are respectively connected to the middle of the two end bus strips (20); a middle bus strip (30) is provided between the two battery string groups, and the middle bus strip (30) includes a first bus strip segment (31) connected to the three battery strings (10) on one side of each battery string group and a second bus strip segment (32) connected to the three battery strings (10) on the other side of each battery string group, and the first bus strip segment (31) and the second bus strip segment (32) are provided with lead ends, and the first direction is perpendicular to the second direction.

2. The photovoltaic module according to claim 1, characterized in that: Each of the end busbar (20), the first busbar segment (31) and the second busbar segment (32) comprises a thickened segment (a) and a non-thickened segment (b), wherein the cross-sectional area of ​​the thickened segment (a) is greater than the cross-sectional area of ​​the non-thickened segment (b).

3. The photovoltaic module according to claim 2, characterized in that: The cross-sectional area of ​​the lead-out end is greater than or equal to the cross-sectional area of ​​the thickened section (a).

4. The photovoltaic module according to claim 2, characterized in that: The thickened section (a) comprises at least two layers of stacked busbars.

5. The photovoltaic module according to claim 2, characterized in that: The thickened section (a) of the end busbar (20) is located in the middle region of the end busbar (20).

6. The photovoltaic module according to claim 2, characterized in that: The thickened sections (a) of the first busbar segment (31) and the second busbar segment (32) are located in the middle region of the first busbar segment (31) and the second busbar segment (32), or in the end regions where the first busbar segment (31) and the second busbar segment (32) are close to each other.

7. The photovoltaic module according to claim 1, characterized in that: The device also comprises an integrated junction box (50), wherein the integrated junction box (50) is provided with a positive terminal, a negative terminal, a second diode (52) and a third diode (53), wherein the lead-out terminal comprises a first lead-out terminal (311) and a second lead-out terminal (321), wherein the first lead-out terminal (311) and the second lead-out terminal (321) are respectively connected to mutually adjacent ends of the first busbar segment (31) and the second busbar segment (32), wherein the first lead-out terminal (311) and the second lead-out terminal (321) are connected to the positive terminal and the negative terminal; wherein a lead-out terminal (41) is provided in the middle of the jumper (40), wherein the second diode (52) is connected to the lead-out terminal (41) and the first lead-out terminal (311), and wherein the third diode (53) is connected to the second lead-out terminal (321) and the lead-out terminal (41).

8. The photovoltaic module according to claim 7, characterized in that: The integrated junction box (50) is further provided with a first diode (51), and the first diode (51) is connected to the second lead-out end (321) and the first lead-out end (311).

9. The photovoltaic module according to claim 1, characterized in that: The invention also comprises a positive terminal box (60), a negative terminal box (70) and an intermediate terminal box (80); the positive terminal box (60) is provided with a positive terminal, the negative terminal box (70) is provided with a negative terminal, and the intermediate terminal box (80) is provided with a second diode (52) and a third diode (53); the lead-out terminals comprise a first lead-out terminal (311), a second lead-out terminal (321), a third lead-out terminal (312) and a fourth lead-out terminal (322); the first lead-out terminal (311) and the second lead-out terminal (321) are respectively connected to the first busbar segment (31) and the second busbar segment ( The jumper (40) is provided with a lead end (41) in the middle of the first busbar segment (31) and the second lead end (321), the first lead end (311) and the second lead end (321) are connected to the positive terminal and the negative terminal; the third lead end (312) and the fourth lead end (322) are respectively connected to the ends of the first busbar segment (31) and the second busbar segment (32) that are close to each other; the jumper (40) is also provided with a lead end (41) in the middle of the jumper (40), the second diode (52) is connected to the lead end (41) and the third lead end (312), and the third diode (53) is connected to the fourth lead end (322) and the lead end (41).

10. The photovoltaic module according to claim 9, characterized in that: The intermediate junction box (80) further comprises a first diode (51), wherein the first diode (51) is connected to the fourth lead-out terminal (322) and the third lead-out terminal (312).

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