A wiring structure applied to a battery three-cut photovoltaic module

Abstract

This utility model discloses a wiring structure for a three-cell photovoltaic module, relating to the field of photovoltaic module manufacturing technology. It includes: a junction box, two bypass current leads, and two bypass connection parts connected to each of two adjacent cell strings. The junction box includes: two first diodes, one second diode, two common terminals, and two current leads. The two ends of the first diodes are connected to one common terminal and one current lead, respectively. The two ends of the second diodes are connected to the two common terminals, respectively. The two ends of one bypass current lead are connected to the positive busbar and one current lead of the three-cell photovoltaic module, respectively. The two ends of the other bypass current lead are connected to the negative busbar and another current lead of the three-cell photovoltaic module, respectively. The leads of the two bypass connection parts are connected to the two common terminals, respectively. This embodiment reduces the number of bends and the number of junction boxes.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module manufacturing technology, and in particular to a wiring structure for a three-cell photovoltaic module. Background Technology

[0002] For existing triple-cut photovoltaic modules, such as Figure 1 As shown, it is generally divided into three battery string groups 001 ( Figure 1 Each red area represents a battery string group 001, and a diode 006 is connected in parallel to each of the three battery string groups 001 using bus 004. When a hot spot problem occurs in the battery cell 002 of any battery string group 001, the diode 006 connected in parallel to that battery string group 001 is turned on, causing that battery string group 001 to short-circuit, so as to ensure that the other battery string groups 001 can work normally.

[0003] Currently, each diode 006 is distributed around the exterior of the triple-cut photovoltaic module, and each diode 006 is independently connected in parallel with the cell string group 001 it manages via busbar 004. For example... Figure 2 As shown, each diode 006 needs to be connected to two outwardly bent leads of busbar 004 at both ends, and through holes (e.g.,) are made on the backplate 005 at the positions corresponding to the outward bends of busbar 004. Figure 1 To achieve parallel connection between each battery string 001 and diode 006, the three points A, B, and C in the circuit must be specified. Therefore, existing three-cell photovoltaic modules require at least six outwardly bent leads on the busbar 004 to connect three diodes 006 respectively, and each diode 006 needs a separate junction box. The more outwardly bent leads there are, the higher the photovoltaic module failure rate will be, and the lower the photovoltaic module production efficiency will be. Utility Model Content

[0004] In view of this, this utility model embodiment provides a wiring structure for a three-cell photovoltaic module. By setting two bypass current leads and two bypass connection leads that are respectively connected to each of two adjacent cell strings, only four leads are needed on the busbar to achieve parallel connection between the three cell strings and the three diodes, effectively reducing the number of busbar leads and the number of busbar bends, thereby reducing the photovoltaic module failure rate. Moreover, by simultaneously setting two first diodes, one second diode, two common terminals, and two current leads in the junction box, the number of junction boxes can be effectively reduced, which is more conducive to the realization of automated processes.

[0005] In a first aspect, this utility model provides a wiring structure for a triple-cut photovoltaic module, wherein the triple-cut photovoltaic module consists of three series-connected battery strings. The wiring structure includes: a junction box, two bypass current leads, and two bypass connection parts respectively connected to each of the two adjacent battery strings. The junction box includes: two first diodes, one second diode, two common terminals, and two current leads; the two ends of the first diodes are respectively connected to one of the common terminals and one of the current leads; the two ends of the second diodes are respectively connected to the two common terminals; the two ends of one bypass current lead... The first diode, the second diode, the first diode, the second diode, and the third diode are respectively connected to the positive busbar of the three-phase photovoltaic module and one current lead-out terminal; the two ends of the other bypass current lead-out part are respectively connected to the negative busbar of the three-phase photovoltaic module and another current lead-out terminal; the leads of the two bypass connection parts are respectively connected to the two common terminals; one bypass current lead-out part, its connected current lead-out terminal, the first diode, the common terminal, and one bypass connection part constitute a bypass circuit of the battery string group; the two bypass connection parts, their connected two common terminals, and the second diode constitute a bypass circuit of the battery string group.

[0006] Optionally, it further includes: three guide holes spaced apart on the backplate of the three-cell photovoltaic module; the three guide holes are linearly arranged along the extension direction of the bypass connection; one end of each of the two bypass current leads passes through the two guide holes on both sides and is connected to one current lead terminal; the two leads of the two bypass connections facing each other pass through the middle guide hole and are connected to the two common terminals respectively.

[0007] Optionally, the bypass current lead-out portion includes: a first current-guiding fold line and a bypass busbar encapsulated within the three-cell photovoltaic module; the extension direction of the bypass busbar is consistent with the extension direction of the cell string in the three-cell photovoltaic module; one end of the bypass busbar is connected to the positive electrode busbar or the negative electrode busbar, and the other end is connected to one end of the first current-guiding fold line; the other end of the first current-guiding fold line passes through the current-guiding hole and is connected to the current lead-out terminal.

[0008] Optionally, the first guide line and the bypass busbar connected to it are an integral structure.

[0009] Optionally, the number of junction boxes is one; the position of the junction box corresponds to the three flow guide holes.

[0010] Optionally, it further includes: two current guiding holes disposed on the back panel of the three-cut photovoltaic module; a first current guiding hole of the two current guiding holes is disposed between the positive busbar and the negative busbar; a second current guiding hole of the two current guiding holes is disposed between the two bypass connection portions; one end of the bypass current lead-out portion is connected to the positive busbar or the negative busbar, and the other end passes through the first current guiding hole and is connected to one of the current lead-out terminals; the lead-out ends of the two bypass connection portions pass through the second current guiding hole and are respectively connected to the two common terminals.

[0011] Optionally, the bypass current lead-out portion is a second current-guiding fold line with one end connected to the positive busbar or the negative busbar; the other end of the second current-guiding fold line passes through the current-guiding hole and is connected to the current lead-out terminal; or, one of the bypass current lead-out portions is the end lead-out section of the positive busbar, and the other bypass current lead-out portion is the end lead-out section of the negative busbar.

[0012] Optionally, there are two junction boxes, and the positions of the two junction boxes correspond to the two flow guide holes respectively.

[0013] Optionally, the two current lead-out terminals are disposed in the first junction box, and the two first diodes, one second diode, and the two common terminals are disposed in the second junction box; the first junction box is disposed corresponding to the first current guide hole; the second junction box is disposed corresponding to the second current guide hole.

[0014] or,

[0015] Two current-leading terminals and two first diodes are disposed in a third junction box, and one second diode and two common terminals are disposed in a fourth junction box; the third junction box is disposed corresponding to the first current-guiding hole; the fourth junction box is disposed corresponding to the second current-guiding hole.

[0016] Optionally, the junction box further includes a positive terminal and a negative terminal connected to the two current lead terminals respectively; wherein the current lead terminals are connected to the positive terminal or the negative terminal by copper wire.

[0017] Optionally, in a structure where two current leads are disposed in a first junction box and two first diodes are disposed in a second junction box, the current leads are connected to the first diodes by aluminum wire.

[0018] Optionally, both the positive and negative busbars are disposed on the back side of the battery cell; wherein, the positive or negative busbar is connected to the fine grid on the front side of the battery cell via a conductive element folded along the edge of the battery cell, and a first insulating pad is disposed between the fine grid on the front side of the battery cell and the back side of the battery cell.

[0019] Optionally, the bypass current lead-out portion and / or the bypass connection portion are disposed on one side of the back of the battery cell, and a second insulating pad is disposed between the bypass current lead-out portion and / or the bypass connection portion and the battery cell.

[0020] Optionally, the first insulating pad and / or the second insulating pad may be made of a transparent material.

[0021] Optionally, a slot is provided on the first junction box or the second junction box; wherein the slot is located on the side opposite to the first junction box and the second junction box; and a connector matching the slot is provided on the connection line between the current lead terminal and the first diode, so as to realize the connection between the first junction box and the second junction box after the connector is inserted into the slot.

[0022] or,

[0023] A slot is provided on the third junction box or the fourth junction box; wherein the slot is located on the side opposite to the third junction box and the fourth junction box; and a connector matching the slot is provided on the connection line between the first diode and the common terminal, so as to realize the connection between the third junction box and the fourth junction box after the connector is inserted into the slot.

[0024] The technical solution of the first aspect of the above-mentioned utility model has the following advantages or beneficial effects: By setting two bypass current lead-out parts and two bypass connection parts respectively connected to each of two adjacent battery strings, only four bends are needed in the busbar, effectively reducing the number of bends and thus reducing the photovoltaic module loss rate. Moreover, by simultaneously setting two first diodes, one second diode, two common terminals, and two current lead-out terminals in the junction box, the number of junction boxes can be effectively reduced, which is more conducive to the realization of automated processes. Attached Figure Description

[0025] The accompanying drawings are provided to better understand this utility model and do not constitute an undue limitation thereof. Wherein:

[0026] Figure 1 This is the wiring structure of a three-cell photovoltaic module in the existing technology;

[0027] Figure 2This is a schematic diagram of the connection between the busbar and the diode in the prior art;

[0028] Figure 3 This is a schematic diagram of a wiring structure applied to a three-cell photovoltaic module according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the internal structure of a junction box according to an embodiment of the present utility model;

[0030] Figure 5 This is a schematic diagram of another wiring structure applied to a battery triple-cut photovoltaic module according to an embodiment of the present utility model;

[0031] Figure 6 This is a schematic diagram of another wiring structure applied to a battery triple-cut photovoltaic module according to an embodiment of the present utility model;

[0032] Figure 7 This is a schematic diagram of the internal structure of another junction box according to an embodiment of the present utility model;

[0033] Figure 8 This is a schematic diagram of the specific structure of the second junction box included in the junction box according to an embodiment of the present utility model;

[0034] Figure 9 This is a schematic diagram of the internal structure of a junction box according to another embodiment of the present utility model;

[0035] Figure 10 This is a schematic diagram of the internal structure of another junction box according to an embodiment of the present utility model;

[0036] Figure 11 This is a schematic diagram of the structure of the positive electrode busbar and the negative electrode busbar according to an embodiment of the present invention;

[0037] Figure 12 This is a schematic diagram of the bypass current lead-out section according to an embodiment of the present invention;

[0038] Figure 13 This is a structural schematic diagram showing the positions of the slots and connectors according to an embodiment of the present utility model.

[0039] The attached figures are labeled as follows:

[0040] 1- Junction box; 11- First diode; 12- Second diode; 13- Common terminal; 14- Current lead-out terminal; 15- Negative connector; 16- Positive connector; 2- Bypass current lead-out section; 21- First current guide fold; 22- Bypass busbar; 3- Bypass connection section; 4- Positive busbar; 5- Negative busbar; 6- Current guide hole; 61- First current guide hole; 62- Second current guide hole;

[0041] 100 - First junction box; 200 - Second junction box; 300 - Third junction box; 400 - Fourth junction box; 500 - First insulating pad; 600 - Second insulating pad; 700 - Slot; 800 - Connector;

[0042] 001-Battery string; 002-Battery cell; 003-Conductive component; 004-Busband; 005-Backplate; 006-Diode. Detailed Implementation

[0043] Battery cell 002 Figures 3 to 12 This diagram illustrates a wiring structure for a three-cell photovoltaic module according to an embodiment of the present invention. Figures 3 to 12 As shown, the triple-cut photovoltaic module consists of three series-connected battery string groups 001. The wiring structure for the triple-cut photovoltaic module provided by this utility model includes: a junction box 1, two bypass current leads 2, and two bypass connection parts 3, each connected to every two adjacent battery string groups 001. Specifically, as shown... Figure 4 , Figures 7 to 10 As shown, junction box 1 includes: two first diodes 11, one second diode 12, two common terminals 13, and two current output terminals 14; the two ends of the first diode 11 are respectively connected to one common terminal 13 and one current output terminal 14; the two ends of the second diode 12 are respectively connected to the two common terminals 13; the two ends of one bypass current output part 2 are respectively connected to the positive busbar 4 of the triple-cut photovoltaic module and one current output terminal 14; the two ends of another bypass current output part 2 are respectively connected to the negative busbar 5 of the triple-cut photovoltaic module and another current output terminal 14; the output ends of two bypass connection parts 3 are respectively connected to the two common terminals 13; the bypass current output part 2, its connected current output terminal 14, the first diode 11, the common terminal 13, and the bypass connection part 3 constitute a bypass circuit of a battery string group 001; the two bypass connection parts 3, their connected two common terminals 13, and the second diode 12 constitute a bypass circuit of a battery string group 001.

[0044] Figures 3 to 12As can be seen from the structure, this embodiment of the invention utilizes the bypass current lead-out part 2 in the junction box 1 to extract the current of multiple series-connected battery string groups 001 from the positive busbar 4 and the negative busbar 5 respectively, and utilizes the bypass connection part 3 and the common connection terminal 13 to realize the circuit structure of connecting the first diode 11 and the second diode 12 in parallel with the three battery string groups 001 respectively. The bypass current lead-out part 2 and the bypass connection part 3 can both be located on the back side of the battery string group 001 or in the busbar between two battery strings in the battery string group 001. Since only two common connection terminals 13 and two current lead-out terminals 14 are provided in the junction box 1, that is, only four connection points are needed with the busbar in the battery string group 001, thus requiring only four bends for the busbar, effectively reducing the number of bends compared to the six bends in the prior art. Specifically, with Figure 3 For example, only the lower ends of the two vertically arranged bypass current lead-out parts 2, the right end of the left bypass connection part 3, and the left end of the right bypass connection part 3 need to be bent.

[0045] Below, let's start with Figure 3 and Figure 4 Taking an example, a wiring structure provided by an embodiment of this utility model will be described in detail, wherein, Figure 3 The diagram illustrates the positional relationship between the cell string group 001, the bypass current lead-out section 2, and the bypass connection section 3 in a photovoltaic module, as well as the corresponding placement of the junction box 1 on the back panel of the photovoltaic module. Figure 4 A schematic diagram of the internal structure of junction box 1 is shown.

[0046] For Figure 3 and Figure 4 The wiring structure shown requires multiple current guiding holes 6 to be provided on the back panel of the photovoltaic module to facilitate the outflow of bypass current lead-out part 2 and bypass connection part 3, as shown. Figure 3 As shown. Therefore, in an optional embodiment, three guide holes 6 are spaced apart on the backplane of the three-cell photovoltaic module; the three guide holes 6 are linearly arranged along the extension direction of the bypass connection part 3; one end of each of the two bypass current lead-out parts 2 passes through the two guide holes 6 located on both sides and is connected to a current lead-out terminal 14; the two leads of the two bypass connection parts 3 facing each other pass through the middle guide hole 6 and are connected to two common terminals 13 respectively.

[0047] In further optional embodiments, such as Figure 4As shown, insertion holes corresponding to the bypass current lead-out portion 2 and the bypass connection portion 3 are also provided on the current lead-out terminal 14 and the common terminal 13, respectively. For example, one end of the bypass current lead-out portion 2 passes through the guide holes 6 located on both sides and is inserted into the insertion hole on the current lead-out terminal 14, thereby achieving a connection between the bypass current lead-out portion 2 and the current lead-out terminal 14. Similarly, the two opposing leads of the two bypass connection portions 3 pass through the middle guide hole 6 and are inserted into the insertion holes on the two common connection terminals 13, thereby achieving a connection with the two common terminal 13.

[0048] Understandably, regarding Figure 3 and Figure 4 The wiring structure, where the bypass current lead-out part 2 and the bypass connection part 3 can be part of the bypass busbar encapsulated in the photovoltaic module, or they can be independent structures connected to the bypass busbar. Therefore, in a further optional embodiment, such as Figure 4 As shown, the bypass current lead-out section 2 includes: a first current-guiding fold line 21 and a bypass busbar 22 encapsulated within the triple-cut photovoltaic module; the extension direction of the bypass busbar 22 is consistent with the extension direction of the battery string in the triple-cut photovoltaic module; one end of the bypass busbar 22 is connected to the positive electrode busbar 4 or the negative electrode busbar 5, and the other end is connected to one end of the first current-guiding fold line 21; the other end of the first current-guiding fold line 21 passes through the current-guiding hole 6 and is connected to the current lead-out terminal 14. In a further optional embodiment, for ease of installation of the junction box 1, the first current-guiding fold line 21 and the bypass busbar 22 connected thereto are an integral structure.

[0049] It is understandable that, since the three current guide holes 6 are linearly arranged, and the location of the bypass current lead-out part 2 can be moved according to actual conditions, in this embodiment of the invention, by moving the bypass current lead-out part 2 to the adjacent position of the battery string group 001, the technical effect of simultaneously encapsulating three diodes with only one junction box can be achieved. For example, in comparison... Figure 3 and Figure 1 As can be seen from the position of the bypass current lead-out section 2, although the two longitudinal bypass current lead-out sections 2 are moved closer to the center in this embodiment of the invention, it does not affect the structure of the bypass circuit of the battery string group 001 formed by each bypass current lead-out section 2 and a bypass connection section 3. Therefore, it does not affect the overall wiring structure. Therefore, in an optional embodiment of the invention, in order to minimize the number of junction boxes 1, the number of junction boxes 1 is set to one; and the position of the junction box 1 corresponds to the three current guide holes 6.

[0050] Furthermore, conventional busbars are typically flat and strip-shaped; therefore, in this embodiment of the invention, the shape of the insertion hole matches the cross-section of the busbar. For example, from... Figure 4As can be seen, since the bypass current lead-out part 2 is arranged vertically and the bypass connection part 3 is arranged horizontally, after the bypass current lead-out part 2 and the bypass connection part 3 are bent vertically, the insertion holes on the current lead-out terminal 14 and the common terminal 13 are both rectangular. The long side of the rectangular insertion hole on the current lead-out terminal 14 is perpendicular to the extension direction of the battery string in the battery string group 001, and the long side of the rectangular insertion hole on the common terminal 13 is the same as the extension direction of the battery string in the battery string group 001.

[0051] The above Figure 3 and Figure 4 The structure described above is merely one embodiment of the wiring structure for a three-cell photovoltaic module provided in this utility model embodiment. The wiring structure provided in this utility model embodiment can also be as follows: Figures 6 to 8 As shown. Among them, Figure 6 The diagram illustrates the positional relationship between the cell string group 001, the bypass current lead-out section 2, and the bypass connection section 3 in a photovoltaic module, as well as the corresponding placement of the junction box 1 on the back panel of the photovoltaic module. Figure 7 A schematic diagram of the internal structure of junction box 1 is shown. Figure 8 A schematic diagram of the specific structure of the second junction box 200 included in junction box 1 is shown.

[0052] Specifically Figure 6 The blue hollow circle in the image indicates the location of the bypass current lead-out section 2 in this embodiment. In one optional embodiment, the bypass current lead-out section 2 can be a part of the positive busbar 4 or the negative busbar 5, that is, one bypass current lead-out section 2 is the end lead-out section of the positive busbar 4, and the other bypass current lead-out section 2 is the end lead-out section of the negative busbar 5. Since the bypass current lead-out section 2 itself is also a conductive material similar to the busbar, the consumption of raw materials can be minimized in this case. In another optional embodiment, the bypass current lead-out section 2 can also be a connection structure separately provided outside the positive busbar 4 and the negative busbar 5, that is, similar to the aforementioned first current guiding line 21, the bypass current lead-out section 2 is a second current guiding line with one end connected to the positive busbar 4 or the negative busbar 5.

[0053] Understandably, due to Figure 6 The bypass current lead-out section 2 and the bypass connection section 3 are arranged in parallel. The bypass current lead-out section 2 is connected to the current lead-out terminal 14 in the junction box 1, and the bypass connection section 3 is connected to the common terminal 13 in the junction box 1. Therefore, it is necessary to adjust the length of the connecting wire between the current lead-out terminal 14 and the common terminal 13 in the junction box 1 to achieve the electrical connection between the parallel bypass current lead-out section 2 and the bypass connection section 3. Therefore, in an optional embodiment, such as... Figure 6As shown, it also includes: two guide holes 6 disposed on the back panel of the three-cell photovoltaic module; the first guide hole 61 of the two guide holes 6 is disposed between the positive busbar 4 and the negative busbar 5; the second guide hole 62 of the two guide holes 6 is disposed between the two bypass connection parts 3; one end of the bypass current lead-out part 2 is connected to the positive busbar 4 or the negative busbar 5, and the other end passes through the first guide hole 61 and is connected to a current lead-out terminal 14; the lead-out ends of the two bypass connection parts 3 pass through the second guide hole 62 and are respectively connected to two common terminals 13.

[0054] It is understandable that, due to the considerable distance between the parallel bypass current lead-out part 2 and the bypass connection part 3, if only one junction box 1 is provided, the junction box 1 would be too large. Therefore, in this embodiment of the utility model, for this wiring structure, such as Figure 7 and Figure 8 As shown, there are two junction boxes 1, and the positions of the two junction boxes 1 correspond to the two current guide holes 6 respectively. In this case, the connection between the current lead-out terminal 14, the first diode 11, and the common terminal 13 is achieved by the connecting wire between the two junction boxes 1. Specifically, as shown... Figure 8 and Figure 6 The combined wiring structure or Figure 10 and Figure 6 As shown in the combined wiring structure, a current lead-out terminal 14 on the left, a first diode 11 on the left, and a common terminal 13 on the left constitute the bypass circuit of battery string group 001a. A common terminal 13 on the left, a second diode 12, and another common terminal 13 on the right constitute the bypass circuit of battery string group 001c. A common terminal 13 on the right, a first diode 11 on the right, and a current lead-out terminal 14 on the right constitute the bypass circuit of battery string group 001b. (Comparison) Figure 7 and Figure 3 It can be seen that by... Figure 3 The bypass current lead-out section 2, which is arranged longitudinally in the middle, is shortened to the end of the positive busbar 4 or the negative busbar 5, and the connection wire between the current lead-out terminal 14 in the junction box 1 and the first diode 11 is increased, replacing the previous method. Figure 3 The bypass current lead-out section 2, which is arranged longitudinally in the middle, realizes the circuit connection of this utility model embodiment.

[0055] Understandably, this can be achieved by increasing the length of the connection wire between the current lead-out terminal 14 and the first diode 11 in junction box 1, instead of... Figure 3 The longitudinally arranged bypass current lead-out section 2 can also increase the length of connecting wires at other locations in the junction box 1 to replace... Figure 3The bypass current lead-out section 2 is arranged longitudinally in the middle. Therefore, in addition to Figure 7 The junction box structure shown can also be used for Figure 9 The junction box structure shown, in one optional embodiment, has two current lead-out terminals 14 disposed in the first junction box 100, and two first diodes 11, one second diode 12, and two common terminals 13 disposed in the second junction box 200; the first junction box 100 is disposed corresponding to the first current guide hole 61; the second junction box 200 is disposed corresponding to the second current guide hole 62; or, the two current lead-out terminals 14 and two first diodes 11 are disposed in the third junction box 300, and one second diode 12 and two common terminals 13 are disposed in the fourth junction box 400; the third junction box 300 is disposed corresponding to the first current guide hole 61; the fourth junction box 400 is disposed corresponding to the second current guide hole 62. Further, Figure 10 It shows the relationship with Figure 9 The specific internal structure of the corresponding junction box 1. From... Figure 10 It can be seen that, under this design structure, the electrical connection between the third junction box 300 and the fourth junction box 400 is achieved by using the connecting wire between the common terminal 13 of the first diode 11.

[0056] Furthermore, conventional busbars are typically flat and strip-shaped; therefore, in this embodiment of the invention, the shape of the insertion hole matches the cross-section of the busbar. For example, from... Figure 8 and Figure 10 As can be seen, since both the bypass current lead-out part 2 and the bypass connection part 3 are horizontally arranged, after the bypass current lead-out part 2 and the bypass connection part 3 are bent vertically, the insertion holes on the current lead-out terminal 14 and the common terminal 13 are both rectangular, and the direction of the long side of the rectangle is the same as the extension direction of the battery string in the battery string group 001.

[0057] In further optional embodiments, such as Figure 4 , Figure 7 , Figure 9 As shown, junction box 1 also includes a positive terminal 16 and a negative terminal 15, which are respectively connected to the two current output terminals 14; wherein, the current output terminals 14 are connected to the positive terminal 16 or the negative terminal 15 by copper wire. It is understood that since the function of the current output terminals 14 is to conduct current from the positive busbar 4 and the negative busbar 5, it is necessary to ensure the conductivity between the current output terminals 14 and the positive terminal 16 and the negative terminal 15, therefore, copper wire connection is required.

[0058] The connection between the current lead-out terminal 14 and the first diode 11 only occurs when the battery string 001 malfunctions. Therefore, in an optional embodiment, for the structure where the two current lead-out terminals 14 are located in the first junction box 100 and the two first diodes 11 are located in the second junction box 200, aluminum wire is used to connect the current lead-out terminals 14 and the first diodes 11. Compared to copper wire, aluminum wire has poor conductivity but is cheaper. Therefore, this embodiment uses aluminum wire for the less frequently used connection wires and copper wire for the more frequently used connection wires. This ensures the photoelectric conversion efficiency of the photovoltaic module while appropriately reducing material costs.

[0059] In a further optional embodiment, for the case where there are two junction boxes 1, it can also be as follows: Figure 13 As shown, a slot 700 is provided on the first junction box 100 or the second junction box 200; wherein the slot 700 is located on the opposite side of the first junction box 100 and the second junction box 200; and a connector 800 matching the slot 700 is provided on the connection line between the current lead-out terminal 14 and the first diode 11, so that the connection between the first junction box 100 and the second junction box 200 is realized after the connector 800 is inserted into the slot 700; or, a slot 700 is provided on the third junction box 300 or the fourth junction box 400; wherein the slot 700 is located on the opposite side of the third junction box 300 and the fourth junction box 400; and a connector 800 matching the slot 700 is provided on the connection line between the first diode 11 and the common terminal 13, so that the connection between the third junction box 300 and the fourth junction box 400 is realized after the connector 800 is inserted into the slot 700. From Figure 13 As can be seen, the connectors 800 on the connecting wire enable flexible connection between the two junction boxes 1. That is, by adjusting the position and length of the connecting wire, electrical connection can be achieved when the two junction boxes 1 are in different positions. Furthermore, connectors 800 can be provided at both ends of the connecting wire, and slots 700 can be provided on opposite sides of both junction boxes 1. This allows electrical connection between the two junction boxes 1 to be achieved by inserting the connectors 800 at both ends of the connecting wire into the slots 700 on the two junction boxes 1 respectively.

[0060] In addition, regarding the placement of the positive busbar 4 and the negative busbar 5, in one optional embodiment, as follows: Figure 11As shown, the positive busbar 4 and the negative busbar 5 are both disposed on the back side of the battery string 001; wherein, the positive busbar 4 or the negative busbar 5 is connected to the fine grid on the front side of the battery cell 002 through a conductive member 003 folded along one side of the edge of the edge battery cell 002 in the battery string 001, and a first insulating pad 500 is provided between the conductive member 003 on the front side of the battery cell 002 and the back side of the battery cell 002 after folding, so as to avoid the conductive member 003 on the front side from connecting with the back side and causing a short circuit.

[0061] Understandably, since the positive busbar 4 and negative busbar 5 are typically located at the edge of the photovoltaic module, when a first guide hole 6 needs to be opened between the positive busbar 4 and negative busbar 5, the opening position is too close to the edge of the photovoltaic module, which can easily cause microcracks at the edge of the backsheet. Therefore, in this embodiment of the invention, the laying position of the positive busbar 4 and negative busbar 5 is moved towards the center of the photovoltaic module, increasing the distance between the glass edge and the edge of the hole, thereby enhancing the strength of the glass.

[0062] In further optional embodiments, such as Figure 12 As shown, the bypass current lead-out portion 2 and / or the bypass connection portion 3 are disposed on one side of the back of the battery string assembly 001, and a second insulating pad 600 is disposed between the bypass current lead-out portion 2 and / or the bypass connection portion 3 and the battery string assembly 001. For example, Figure 12 Only a cross-sectional view of the bypass current lead-out section 2 is shown. The cross-sectional view of the bypass connection section 3 can be referenced to the cross-sectional view of the bypass current lead-out section 2 for corresponding configuration.

[0063] In an optional embodiment, in order to minimize the impact on the photoelectric conversion efficiency of the battery string 001, especially for the bifacial power generation battery string 001, the first insulating pad 500 and / or the second insulating pad 600 are made of transparent material, such as PET (polyethylene terephthalate), which has good resistance to ultraviolet yellowing and damp heat yellowing. When used outdoors for a long time, it can maintain good light transmittance and will not have a negative impact on the photoelectric conversion performance of the photovoltaic module.

[0064] In summary, the wiring structure for a three-cell photovoltaic module provided by this embodiment of the invention, by setting two bypass current lead-out sections 2 and two bypass connection sections 3 respectively connected to each of two adjacent battery string groups 001, only requires four leads on the busbar to achieve parallel connection between the three battery string groups 001 and the three diodes, effectively reducing the number of busbar leads and the number of bends. Furthermore, by simultaneously placing two first diodes 11, one second diode 12, two common terminals 13, and two current lead-out terminals 14 in the junction box, the number of junction boxes can be effectively reduced, which is more conducive to the realization of automated processes.

[0065] Example 1 (corresponding to) Figure 3 and Figure 4 The wiring structure that they make up together

[0066] A wiring structure for a triple-cut photovoltaic module is disclosed. The triple-cut photovoltaic module consists of three series-connected battery string groups 001. The wiring structure includes: a junction box, two bypass current leads 2, and two bypass connection parts 3, each connected to every two adjacent battery string groups 001. Three guide holes 6 are spaced apart on the backplate 005 of the triple-cut photovoltaic module along the extending direction of the bypass connection parts 3.

[0067] The junction box includes: a current lead-out terminal 14, a first diode 11, a common terminal 13, a second diode 12, a common terminal 13, a first diode 11, and a current lead-out terminal 14 arranged sequentially.

[0068] The upper end of the bypass current lead-out section 3 on the right side is connected to the positive electrode busbar 4 of the three-cell photovoltaic module, and the lower end passes through the current guide hole 6 located on the far right and is connected to the current lead-out terminal 14 on the right side.

[0069] The upper end of the bypass current lead-out section 3 on the left is connected to the negative electrode busbar 5 of the three-cell photovoltaic module, and the lower end passes through the guide hole 6 located on the far left and is connected to the current lead-out terminal 14 on the left.

[0070] The two leads of the two bypass connection parts 3 on the left and right respectively pass through the middle guide hole 6 and are connected to the two common terminals 13;

[0071] A bypass current lead, its connected current lead terminal, a first diode, a common terminal and a bypass connection constitute a bypass circuit of a battery string 001; two bypass connection parts, their connected two common terminals and a second diode constitute a bypass circuit of a battery string 001.

[0072] Example 2 (corresponding to) Figure 6 and Figure 7 The wiring structure that they make up together

[0073] A wiring structure for a triple-cut photovoltaic module, wherein the triple-cut photovoltaic module consists of three series-connected battery string groups 001, the wiring structure includes: two junction boxes (a first junction box 100 and a second junction box 200, respectively), two bypass current outlets 2, and two bypass connection parts 3 respectively connected to each of two adjacent battery string groups 001, and two guide holes 6 on the back panel 005 of the triple-cut photovoltaic module; wherein,

[0074] The first guide hole 61 of the two guide holes 6 is disposed between the positive electrode busbar 4 and the negative electrode busbar 5; the second guide hole 62 of the two guide holes 6 is disposed between the two bypass connection parts 3;

[0075] The first junction box 100 is provided corresponding to the first current guide hole 61 and includes: two current lead-out terminals 14;

[0076] The second junction box 200 is configured corresponding to the second flow guide hole 62 and includes: a first diode 11, a common terminal block 13, a second diode 12, a common terminal block 13, and a first diode 11 arranged sequentially.

[0077] In this configuration, a current lead-out terminal 14 on the left side of the first junction box 100 is connected to a first diode 11 on the left side of the second junction box 200, and another current lead-out terminal 14 on the right side of the first junction box 100 is connected to another first diode 11 on the right side of the second junction box 200.

[0078] The two bypass current outlets 3 are the right end of the positive busbar 4 and the left end of the negative busbar 5, respectively; wherein, the right end of the positive busbar 4 passes through the first guide hole 61 and is connected to the current outlet terminal 14 on the left side of the first junction box 100, and the left end of the negative busbar 5 passes through the first guide hole 61 and is connected to the current outlet terminal 14 on the right side of the first junction box 100.

[0079] The two leads of the left and right bypass connection parts 3 respectively pass through the middle second guide hole 62 and are connected to the two common terminals 13;

[0080] A bypass current lead, its connected current lead terminal, a first diode, a common terminal and a bypass connection constitute a bypass circuit of a battery string 001; two bypass connection parts, their connected two common terminals and a second diode constitute a bypass circuit of a battery string 001.

[0081] Example 3 (corresponding to) Figure 6 and Figure 9 The wiring structure that they make up together

[0082] A wiring structure for a triple-cut photovoltaic module, wherein the triple-cut photovoltaic module consists of three series-connected battery string groups 001, the wiring structure includes: two junction boxes (a first junction box 100 and a second junction box 200, respectively), two bypass current outlets 2, and two bypass connection parts 3 respectively connected to each of two adjacent battery string groups 001, and two guide holes 6 on the back panel 005 of the triple-cut photovoltaic module; wherein,

[0083] The first guide hole 61 of the two guide holes 6 is disposed between the positive electrode busbar 4 and the negative electrode busbar 5; the second guide hole 62 of the two guide holes 6 is disposed between the two bypass connection parts 3;

[0084] The first junction box 100 is provided corresponding to the first current guide hole 61 and includes: two current lead-out terminals 14 and two first diodes 11;

[0085] The second junction box 200 is provided corresponding to the second flow guide hole 62, and includes: a common terminal 13, a second diode 12 and a common terminal 13 arranged in sequence;

[0086] In this configuration, a current lead-out terminal in the first junction box 100 is connected to a first diode, and a first diode in the first junction box 100 is connected to a common connection terminal in the second junction box 200.

[0087] The two bypass current outlets 3 are the right end of the positive busbar 4 and the left end of the negative busbar 5, respectively; wherein, the right end of the positive busbar 4 passes through the first guide hole 61 and is connected to the current outlet terminal 14 on the left side of the first junction box 100, and the left end of the negative busbar 5 passes through the first guide hole 61 and is connected to the current outlet terminal 14 on the right side of the first junction box 100.

[0088] The two leads of the left and right bypass connection parts 3 respectively pass through the middle second guide hole 62 and are connected to the two common terminals 13;

[0089] A bypass current lead, its connected current lead terminal, a first diode, a common terminal and a bypass connection constitute a bypass circuit of a battery string 001; two bypass connection parts, their connected two common terminals and a second diode constitute a bypass circuit of a battery string 001.

[0090] This utility model embodiment also provides the following technical solutions:

[0091] Technical Solution 1. A wiring structure for a triple-cut photovoltaic module, characterized in that the triple-cut photovoltaic module is divided into three series-connected battery string groups, and the wiring structure includes: a junction box 1, two bypass current lead-out parts 2, and two bypass connection parts 3 respectively connected to each of two adjacent battery string groups, wherein,

[0092] The junction box 1 includes: two first diodes 11, one second diode 12, two common terminals 13, and two current lead-out terminals 14;

[0093] The first diode 11 is connected to a common terminal 13 and a current lead-out terminal 14 at its two ends, respectively.

[0094] The two ends of the second diode 12 are respectively connected to the two common terminals 13;

[0095] The two ends of the bypass current lead-out section 2 are respectively connected to the positive current bus 4 of the battery triple-cut photovoltaic module and a current lead-out terminal 14;

[0096] The two ends of the other bypass current lead-out section 2 are respectively connected to the negative electrode busbar 5 of the three-cut photovoltaic module and the other current lead-out terminal 14;

[0097] The leads of the two bypass connection parts 3 are respectively connected to the two common terminals 13;

[0098] A bypass current lead-out section 2, a current lead-out terminal 14 connected thereto, a first diode 11, a common terminal 13, and a bypass connection section 3 constitute a bypass circuit for the battery string group.

[0099] The two bypass connection parts 3, the two common terminals 13 connected thereto, and the second diode 12 constitute a bypass circuit for the battery string.

[0100] Technical Solution 2. The wiring structure according to Technical Solution 1 is characterized in that it further includes: three flow guide holes 6 spaced apart on the back plate of the three-cut photovoltaic module;

[0101] The three guide holes 6 are arranged linearly along the extension direction of the bypass connection 3;

[0102] One end of each of the two bypass current leads 2 passes through the two current guide holes 6 located on both sides and is connected to a current lead terminal 14;

[0103] The two leads of the two bypass connection parts 3 facing each other pass through the middle guide hole 6 and are respectively connected to the two common terminals 13.

[0104] Technical Solution 3. The wiring structure according to Technical Solution 2 is characterized in that the bypass current lead-out part 2 includes: a first current guiding fold line 21 and a bypass busbar 22 encapsulated in the battery triple-cut photovoltaic module;

[0105] The extension direction of the bypass busbar 22 is consistent with the extension direction of the battery string in the three-cut photovoltaic module.

[0106] One end of the bypass busbar 22 is connected to the positive busbar 4 or the negative busbar 5, and the other end is connected to one end of the first guide line 21;

[0107] The other end of the first current-guiding fold line 21 passes through the current-guiding hole 6 and is connected to the current lead-out terminal 14.

[0108] Technical Solution 4. The wiring structure according to Technical Solution 2, characterized in that,

[0109] The first guide line 21 and the bypass busbar 22 connected to it are an integral structure.

[0110] Technical Solution 5. The wiring structure according to any one of Technical Solutions 2 to 4, characterized in that,

[0111] The number of junction boxes 1 is one;

[0112] The junction box 1 is located in a position corresponding to the three flow guide holes.

[0113] Technical Solution 6. The wiring structure according to Technical Solution 1 is characterized in that it further includes: two flow guide holes 6 disposed on the back plate of the battery triple-cut photovoltaic module;

[0114] The first flow guide hole 61 of the two flow guide holes 6 is disposed between the positive electrode busbar 4 and the negative electrode busbar 5;

[0115] The second guide hole 62 of the two guide holes 6 is disposed between the two bypass connection parts 3;

[0116] One end of the bypass current lead-out section 2 is connected to the positive busbar 4 or the negative busbar 5, and the other end passes through the first current guide hole 61 and is connected to a current lead-out terminal 14.

[0117] The leads of the two bypass connection parts 3 pass through the second guide hole 62 and are respectively connected to the two common terminals 13.

[0118] Technical Solution 7. The wiring structure according to Technical Solution 6, characterized in that,

[0119] The bypass current lead-out section 2 is a second current-conducting fold line with one end connected to the positive electrode busbar 4 or the negative electrode busbar 5;

[0120] The other end of the second current-guiding fold line passes through the current-guiding hole 6 and is connected to the current lead-out terminal 14;

[0121] or,

[0122] One of the bypass current lead-out sections 2 is the end lead-out section of the positive busbar 4, and the other bypass current lead-out section 2 is the end lead-out section of the negative busbar 5.

[0123] Technical Solution 8. The wiring structure according to any one of Technical Solutions 6 to 7, characterized in that,

[0124] There are two junction boxes 1, and the positions of the two junction boxes 1 are respectively set to correspond to the two flow guide holes 6.

[0125] Technical Solution 9. The wiring structure according to Technical Solution 8, characterized in that,

[0126] Two current lead-out terminals 14 are disposed in the first junction box 100, and two first diodes 11, one second diode 12 and two common terminals 13 are disposed in the second junction box 200;

[0127] The first junction box 100 is provided corresponding to the first flow guide hole 61;

[0128] The second junction box 200 is provided corresponding to the second flow guide hole 62;

[0129] or,

[0130] Two current lead-out terminals 14 and two first diodes 11 are disposed in the third junction box 300, and one second diode 12 and two common terminals 13 are disposed in the fourth junction box 400;

[0131] The third junction box 300 is provided corresponding to the first flow guide hole 61;

[0132] The fourth junction box 400 is provided corresponding to the second flow guide hole 62.

[0133] Technical Solution 10. The wiring structure according to Technical Solution 1, characterized in that,

[0134] The junction box 1 further includes a negative terminal connector 15 and a positive terminal connector 16, which are respectively connected to the two current lead-out terminals 14;

[0135] The current lead-out terminal 14 is connected to the negative terminal 15 or the positive terminal 16 by a copper wire.

[0136] Technical Solution 11. The wiring structure according to Technical Solution 9, characterized in that,

[0137] Regarding the structure where the two current lead-out terminals 14 are located in the first junction box 100 and the two first diodes 11 are located in the second junction box 200.

[0138] The current lead-out terminal 14 is connected to the first diode 11 by an aluminum wire.

[0139] Technical Solution 12. The wiring structure according to Technical Solution 1, characterized in that,

[0140] Both the positive electrode busbar 4 and the negative electrode busbar 5 are disposed on the back side of the battery string; wherein, the positive electrode busbar 4 or the negative electrode busbar 5 is connected to the fine grid on the front side of the battery string through a conductive element folded along the edge of the battery string, and a first insulating pad 500 is disposed between the fine grid on the front side of the battery string and the back side of the battery string.

[0141] And / or,

[0142] The bypass current lead-out part 2 and / or the bypass connection part 3 are disposed on one side of the back of the battery string, and a second insulating pad 600 is disposed between the bypass current lead-out part 2 and / or the bypass connection part 3 and the battery string.

[0143] Technical Solution 13. The wiring structure according to Technical Solution 12, characterized in that,

[0144] The first insulating pad 500 and / or the second insulating pad 600 are made of transparent material.

[0145] Technical Solution 14. The wiring structure according to Technical Solution 9, characterized in that,

[0146] A slot 700 is provided on the first junction box 100 or the second junction box 200; wherein the slot 700 is located on the side of the first junction box 100 and the second junction box 200 opposite to each other;

[0147] A connector 800 matching the slot 700 is provided on the connection line between the current lead-out terminal 14 and the first diode 11, so that the connection between the first junction box 100 and the second junction box 200 can be realized after the connector 800 is inserted into the slot 700.

[0148] or,

[0149] A slot 700 is provided on the third junction box 300 or the fourth junction box 400; wherein the slot 700 is located on the side of the third junction box 300 and the fourth junction box 400 opposite to each other;

[0150] A connector 800 matching the slot 700 is provided on the connection line between the first diode 11 and the common terminal 13, so that the connection between the third junction box 300 and the fourth junction box 400 can be realized after the connector 800 is inserted into the slot 700.

[0151] The above steps are provided only to help understand the structure, method, and core idea of ​​this utility model. For those skilled in the art, various improvements and modifications can be made to this utility model without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.

Claims

1. A wiring structure for a three-cell photovoltaic module, characterized in that, The three-cell photovoltaic module is divided into three series-connected battery strings. The wiring structure includes: a junction box (1), two bypass current leads (2), and two bypass connection parts (3) respectively connected to each of the two adjacent battery strings. The junction box (1) includes: two first diodes (11), one second diode (12), two common terminals (13), and two current output terminals (14). The first diode (11) is connected to a common terminal (13) and a current lead-out terminal (14) at its two ends respectively; The two ends of the second diode (12) are respectively connected to the two common terminals (13); The two ends of one of the bypass current leads (2) are respectively connected to the positive busbar (4) of the battery triple-cut photovoltaic module and a current lead terminal (14); The two ends of the other bypass current lead (2) are respectively connected to the negative busbar (5) of the battery triple-cut photovoltaic module and the other current lead terminal (14); The leads of the two bypass connection parts (3) are respectively connected to the two common terminals (13); A bypass current lead (2), its connected current lead terminal (14), a first diode (11), a common terminal (13), and a bypass connection (3) constitute a bypass circuit for the battery string group. The two bypass connection parts (3), the two common terminals (13) connected thereto, and the second diode (12) constitute a bypass circuit for the battery string.

2. The wiring structure according to claim 1, characterized by Also includes: Three flow guide holes (6) are spaced apart on the back plate of the three-cut photovoltaic module. The three guide holes (6) are arranged linearly along the extension direction of the bypass connection (3); One end of each of the two bypass current leads (2) passes through the two current guide holes (6) located on both sides and is connected to a current lead terminal (14); The two leads of the two bypass connection parts (3) facing each other pass through the middle guide hole (6) and are respectively connected to the two common terminals (13).

3. The wiring structure according to claim 2, wherein The bypass current lead-out section (2) includes: a first current-guiding fold line (21) and a bypass busbar (22) encapsulated in the battery triple-cut photovoltaic module. The extension direction of the bypass busbar (22) is consistent with the extension direction of the battery string in the three-cut photovoltaic module; One end of the bypass busbar (22) is connected to the positive busbar (4) or the negative busbar (5), and the other end is connected to one end of the first guide line (21); The other end of the first current-guiding fold line (21) passes through the current-guiding hole (6) and is connected to the current-leading terminal (14).

4. The wiring structure according to claim 3, characterized in that, The first guide line (21) and the bypass busbar (22) connected to it are an integral structure.

5. The wiring structure according to any one of claims 2 to 4, characterized in that, The number of junction boxes (1) is one; The junction box (1) is located in a position corresponding to the three flow guide holes.

6. The wiring structure according to claim 1, wherein Also includes: Two flow guide holes (6) are provided on the back plate of the three-cut photovoltaic module. The first of the two guide holes (6) is disposed between the positive electrode busbar (4) and the negative electrode busbar (5); The second guide hole (62) of the two guide holes (6) is disposed between the two bypass connection parts (3); One end of the bypass current lead-out section (2) is connected to the positive busbar (4) or the negative busbar (5), and the other end passes through the first guide hole (61) and is connected to one of the current lead-out terminals (14). The leads of the two bypass connection parts (3) pass through the second guide hole (62) and are respectively connected to the two common terminals (13).

7. The wiring structure according to claim 6, characterized in that, The bypass current lead-out section (2) is a second current-guiding line with one end connected to the positive busbar (4) or the negative busbar (5); The other end of the second current-guiding fold line passes through the current-guiding hole (6) and is connected to the current lead-out terminal (14); or, One of the bypass current lead-out sections (2) is the end lead-out section of the positive busbar (4), and the other bypass current lead-out section (2) is the end lead-out section of the negative busbar (5).

8. The wiring structure according to any one of claims 6 to 7, characterized in that, There are two junction boxes (1), and the positions of the two junction boxes (1) are respectively set to correspond to the two guide holes (6).

9. The wiring structure according to claim 8, characterized in that, Two current lead-out terminals (14) are disposed in the first junction box (100), and two first diodes (11), one second diode (12), and two common terminals (13) are disposed in the second junction box (200); The first junction box (100) is provided corresponding to the first flow guide hole (61); The second junction box (200) is provided corresponding to the second flow guide hole (62); or, Two current lead-out terminals (14) and two first diodes (11) are disposed in a third junction box (300), and a second diode (12) and two common terminals (13) are disposed in a fourth junction box (400); The third junction box (300) is provided corresponding to the first flow guide hole (61); The fourth junction box (400) is provided corresponding to the second flow guide hole (62).

10. The wiring structure according to claim 1, characterized in that, The junction box (1) further includes a negative terminal (15) and a positive terminal (16) respectively connected to the two current lead-out terminals (14). The current lead-out terminal (14) is connected to the negative terminal (15) or the positive terminal (16) by copper wire.

11. The wiring structure according to claim 9, characterized in that, With regard to the structure in which the two current lead-out terminals (14) are disposed in the first junction box (100) and the two first diodes (11) are disposed in the second junction box (200), The current lead-out terminal (14) is connected to the first diode (11) by an aluminum wire.

12. The wiring structure according to claim 1, characterized in that, Both the positive busbar (4) and the negative busbar (5) are disposed on the back side of the battery string; wherein, the positive busbar (4) or the negative busbar (5) is connected to the fine grid on the front side of the battery string through a conductive member folded along the edge of the battery string, and a first insulating pad (500) is disposed between the fine grid on the front side of the battery string and the back side of the battery string. And / or, The bypass current lead-out part (2) and / or the bypass connection part (3) are disposed on the back side of the battery string, and a second insulating pad (600) is disposed between the bypass current lead-out part (2) and / or the bypass connection part (3) and the battery string.

13. The wiring structure according to claim 12, characterized in that, The first insulating pad (500) and / or the second insulating pad (600) are made of transparent material.

14. The wiring structure according to claim 9, characterized in that, A slot (700) is provided on the first junction box (100) or the second junction box (200); wherein the slot (700) is located on the side opposite to the first junction box (100) and the second junction box (200); A connector (800) matching the slot (700) is provided on the connection line between the current lead-out terminal (14) and the first diode (11) so that the connection between the first junction box (100) and the second junction box (200) can be realized after the connector (800) is inserted into the slot (700); or, A slot (700) is provided on the third junction box (300) or the fourth junction box (400); wherein the slot (700) is located on the side of the third junction box (300) opposite to the fourth junction box (400); A connector (800) matching the slot (700) is provided on the connection line between the first diode (11) and the common terminal (13) so as to realize the connection between the third junction box (300) and the fourth junction box (400) after the connector (800) is inserted into the slot (700).

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