Wiring structure applied to battery three-section photovoltaic module

Abstract

The invention discloses a wiring structure applied to a three-section photovoltaic module of a battery, which relates to the technical field of photovoltaic module manufacturing and comprises a junction box, two bypass current leading-out parts and two bypass connecting parts respectively connected with every two adjacent battery string groups, the junction box comprises two first diodes, a second diode, two common wiring terminals and two current leading-out terminals. Two ends of the first diode are respectively connected with a public wiring terminal and a current leading-out terminal; two ends of the second diode are respectively connected with the two public wiring terminals; two ends of one bypass current leading-out part are respectively connected with an anode bus bar and one current leading-out terminal of the battery three-section photovoltaic module; two ends of the other bypass current leading-out part are respectively connected with a cathode bus bar of the battery three-section photovoltaic module and the other current leading-out terminal; and the leading-out ends of the two bypass connecting parts are respectively connected with the two public wiring terminals. According to the embodiment, the number of bending times and the number of junction boxes are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic module manufacturing, and particularly to a wiring structure applied to a battery triple-cut photovoltaic module. Background Art

[0002] For existing battery triple-cut photovoltaic modules, as Figure 1 shown, they are generally cut into three battery string groups 001 ( Figure 1 each red area in is a battery string group 001), and a diode 006 is respectively connected in parallel to the three battery string groups 001 by a bus bar 004, so that when a hot spot problem occurs in the solar cells 002 in any one of the battery string groups 001, the diode 006 connected in parallel to this battery string group 001 is turned on, causing this battery string group 001 to short-circuit, so as to ensure the normal operation of the other battery string groups 001.

[0003] Currently, each diode 006 is distributed outside the battery triple-cut photovoltaic module, and each diode 006 is independently connected in parallel to the battery string group 001 it manages through a bus bar 004. As Figure 2 shown, both ends of each diode 006 need to be respectively connected to two outwardly bent lead-out ends of the bus bar 004, and through holes (such as Figure 1 the three positions A, B, and C in) are opened on the backplane 005 corresponding to the positions where the bus bar 004 is bent outward, so as to realize the parallel connection of each battery string group 001 and the diode 006. Therefore, the existing battery triple-cut photovoltaic module needs to set at least 6 outwardly bent lead-out ends on the bus bar 004 to respectively connect 3 diodes 006, and a wiring box needs to be installed separately for each diode 006. The more the number of outwardly bent lead-out ends, the higher the breakage rate of the photovoltaic module, and the production efficiency of the photovoltaic module will be reduced. Summary of the Invention

[0004] In view of this, an embodiment of the present invention provides a wiring structure applied to a battery triple-cut photovoltaic module. By providing two bypass current lead-out parts and two bypass connection parts respectively connected to every two adjacent battery string groups, only 4 lead-out parts need to be set on the bus bar to realize the parallel connection between the three battery string groups and the three diodes respectively, effectively reducing the number of bus bar lead-out parts and the number of bus bar bending times, thereby reducing the breakage rate of the photovoltaic module. Moreover, by setting two first diodes, one second diode, two common wiring terminals, and two current lead-out terminals in the wiring box at the same time, the number of wiring boxes can be effectively reduced, which is more conducive to the realization of the automated process.

[0005] In a first aspect, the present invention provides a wiring structure applied to a triple-cut photovoltaic module of a battery. The triple-cut photovoltaic module of the battery is divided into three series-connected battery string groups. The wiring structure includes: a junction box, two bypass current lead-out parts, and two bypass connection parts respectively connected to every two adjacent battery string groups. Among them, the junction box includes: two first diodes, one second diode, two common wiring terminals, and two current lead-out terminals; both ends of each first diode are respectively connected to one common wiring terminal and one current lead-out terminal; both ends of the second diode are respectively connected to the two common wiring terminals; both ends of one bypass current lead-out part are respectively connected to the positive bus bar of the triple-cut photovoltaic module of the battery and one current lead-out terminal; both ends of the other bypass current lead-out part are respectively connected to the negative bus bar of the triple-cut photovoltaic module of the battery and the other current lead-out terminal; the lead-out ends of the two bypass connection parts are respectively connected to the two common wiring terminals; one bypass current lead-out part, the current lead-out terminal it is connected to, the first diode, the common wiring terminal, and one lateral bypass connection part form a bypass circuit of one battery string group; the two lateral bypass connection parts, the two common wiring terminals they are connected to, and the second diode form a bypass circuit of one battery string group.

[0006] Optionally, it further includes: three diversion holes arranged at intervals on the backplane of the triple-cut photovoltaic module of the battery; the three diversion holes are linearly arranged along the extension direction of the bypass connection part; one end of each of the two bypass current lead-out parts respectively passes through the two diversion holes located on both sides and is connected to one current lead-out terminal; the two lead-out ends facing each other of the two bypass connection parts pass through the middle diversion hole and are respectively connected to the two common wiring terminals.

[0007] Optionally, the bypass current lead-out part includes: a first diversion fold line and a bypass bus bar encapsulated in the triple-cut photovoltaic module of the battery; the extension direction of the bypass bus bar is the same as the extension direction of the battery string in the triple-cut photovoltaic module of the battery; one end of the bypass bus bar is connected to the positive bus bar or the negative bus bar, and the other end is connected to one end of the first diversion fold line; the other end of the first diversion fold line passes through the diversion hole and is connected to the current lead-out terminal.

[0008] Optionally, the first diversion fold line and the bypass bus bar it is connected to are of an integral structure.

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

[0010] Optionally, it further includes: two diversion holes provided on the back plate of the triple-cut photovoltaic module of the battery; the first diversion hole of the two diversion holes is provided between the positive bus bar and the negative bus bar; the second diversion hole of the two diversion holes is provided between the two lateral bypass connection parts; one end of the bypass current lead-out part is connected to the positive bus bar or the negative bus bar, the other end passes through the first diversion hole and is connected to one of the current lead-out terminals; the lead-out ends of the two lateral bypass connection parts pass through the second diversion hole and are respectively connected to the two common connection terminals.

[0011] Optionally, the bypass current lead-out part is a second diversion broken line with one end connected to the positive bus bar or the negative bus bar; the other end of the second diversion broken line passes through the diversion hole and is connected to the current lead-out terminal; alternatively, one bypass current lead-out part is the end lead-out section of the positive bus bar, and the other bypass current lead-out part is the end lead-out section of the negative bus bar.

[0012] Optionally, the number of the junction boxes is two, and the positions of the two junction boxes respectively correspond to the two diversion holes.

[0013] Optionally, the two current lead-out terminals are arranged in the first junction box, the two first diodes, one second diode and the two common connection terminals are arranged in the second junction box; the first junction box corresponds to the first diversion hole; the second junction box corresponds to the second diversion hole;

[0014] Or,

[0015] the two current lead-out terminals and the two first diodes are arranged in the third junction box, one second diode and the two common connection terminals are arranged in the fourth junction box; the third junction box corresponds to the first diversion hole; the fourth junction box corresponds to the second diversion hole.

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

[0017] Optionally, for the structure where the two current lead-out terminals are arranged in the first junction box and the two first diodes are arranged in the second junction box, the current lead-out terminal and the first diode are connected by an aluminum wire.

[0018] Optionally, both the positive bus bar and the negative bus bar are disposed on the back side of the battery cell; wherein, either the positive bus bar or the negative bus bar is connected to the fine grid on the front side of the battery cell through a conductive member 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 extraction portion and / or the bypass connection portion are disposed on the back side of the battery cell, and a second insulating pad is disposed between the bypass current extraction portion and / or the bypass connection portion and the battery cell.

[0020] Optionally, the first insulating pad and / or the second insulating pad are 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 where the first junction box and the second junction box face each other; and a plug-in member matching the slot is provided on the connection line between the current extraction terminal and the first diode, so as to realize the connection between the first junction box and the second junction box after the plug-in member 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 where the third junction box and the fourth junction box face each other; and a plug-in member matching the slot is provided on the connection line between the first diode and the common connection terminal, so as to realize the connection between the third junction box and the fourth junction box after the plug-in member is inserted into the slot.

[0024] The technical solution of the first aspect of the above invention has the following advantages or beneficial effects: By providing two bypass current extraction portions and two bypass connection portions respectively connected to every two adjacent battery string groups, only 4 bends need to be made on the bus bar, effectively reducing the number of bends, thereby reducing the breakage rate of the photovoltaic module. Moreover, by simultaneously disposing two first diodes, one second diode, two common connection terminals, and two current extraction terminals in the junction box, the number of junction boxes can be effectively reduced, which is more conducive to the realization of the automated process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are used to better understand the present invention and do not constitute an improper limitation to the present invention. Among them:

[0026] Figure 1 is the wiring structure of a three-cut battery photovoltaic module in the prior art;

[0027] Figure 2It is a schematic structural diagram of the connection between the bus bar and the diode in the prior art;

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

[0029] Figure 4 It is a schematic diagram of the specific structure inside a junction box according to an embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of another wiring structure applied to a three-cut photovoltaic module of a battery according to an embodiment of the present invention;

[0031] Figure 6 It is a schematic diagram of yet another wiring structure applied to a three-cut photovoltaic module of a battery according to an embodiment of the present invention;

[0032] Figure 7 It is a schematic diagram of another specific structure inside a junction box according to an embodiment of the present invention;

[0033] Figure 8 It 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 invention;

[0034] Figure 9 It is a schematic diagram of yet another structure inside a junction box according to an embodiment of the present invention;

[0035] Figure 10 It is a schematic diagram of yet another specific structure inside a junction box according to an embodiment of the present invention;

[0036] Figure 11 It is a schematic diagram of the positive bus bar and the negative bus bar according to an embodiment of the present invention;

[0037] Figure 12 It is a schematic diagram of the bypass current extraction part according to an embodiment of the present invention;

[0038] Figure 13 It is a schematic diagram of the positions where the slots and the plug-in parts are arranged according to an embodiment of the present invention.

[0039] The reference numerals are as follows:

[0040] 1 - Junction box; 11 - First diode; 12 - Second diode; 13 - Common wiring terminal; 14 - Current extraction terminal; 15 - Negative connector; 16 - Positive connector; 2 - Bypass current extraction part; 21 - First diversion fold line; 22 - Bypass bus bar; 3 - Bypass connection part; 4 - Positive bus bar; 5 - Negative bus bar; 6 - Diversion hole; 61 - First diversion hole; 62 - Second diversion 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 group; 002 - Solar cell; 003 - Conductive member; 004 - Bypass strip; 005 - Backsheet; 006 - Diode. Detailed implementation mode

[0043] Solar cell 002 Figures 3 to 12 The figure shows a schematic diagram of a wiring structure applied to a three - cut photovoltaic module of a battery provided by an embodiment of the present invention. As Figures 3 to 12 shown, the three - cut photovoltaic module of the battery is divided into three serially connected battery string groups 001. The wiring structure applied to the three - cut photovoltaic module of the battery provided by the present invention includes: a junction box 1, two bypass current lead - out parts 2, and two bypass connection parts 3 respectively connected to every two adjacent battery string groups 001. Specifically, as Figure 4 , Figures 7 to 10 shown, the junction box 1 includes: two first diodes 11, one second diode 12, two common wiring terminals 13, and two current lead - out terminals 14; both ends of the first diode 11 are respectively connected to a common wiring terminal 13 and a current lead - out terminal 14; both ends of the second diode 12 are respectively connected to the two common wiring terminals 13; both ends of one bypass current lead - out part 2 are respectively connected to the positive bus bar 4 of the three - cut photovoltaic module of the battery and a current lead - out terminal 14; both ends of the other bypass current lead - out part 2 are respectively connected to the negative bus bar 5 of the three - cut photovoltaic module of the battery and the other current lead - out terminal 14; the lead - out ends of the two bypass connection parts 3 are respectively connected to the two common wiring terminals 13; one bypass current lead - out part 2, the current lead - out terminal 14 it is connected to, the first diode 11, the common wiring terminal 13, and a transverse bypass connection part 3 constitute a bypass circuit of a battery string group 001; the two transverse bypass connection parts 3, the two common wiring terminals 13 they are connected to, and the second diode 12 constitute a bypass circuit of a battery string group 001.

[0044] Figures 3 to 12From the structure, it can be seen that in the embodiment of the present invention, the bypass current extraction part 2 in the junction box 1 is used to realize the extraction of the current of multiple series-connected battery string groups 001 from the positive bus bar 4 and the negative bus bar 5 respectively, and the bypass connection part 3 and the common connection terminal 13 are used to realize the circuit structure in which the first diode 11 and the second diode 12 are respectively connected in parallel with three battery string groups 001. Among them, both the bypass current extraction part 2 and the bypass connection part 3 can be bus bars arranged on the back side of the battery string group 001 or between two battery strings in the battery string group 001. Since only two common connection terminals 13 and two current extraction terminals 14 are provided in the junction box 1, that is, only 4 connection positions with the bus bars in the battery string group 001 are required, so only 4 bends are required for the bus bar, compared with 6 bends in the prior art, the number of bends is effectively reduced. Specifically, taking Figure 3 as an example, only the lower ends of two longitudinally arranged bypass current extraction 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] Next, first take Figure 3 and Figure 4 as examples to describe in detail a wiring structure provided by the embodiment of the present invention. Among them, Figure 3 shows the positional relationship between the battery string group 001, the bypass current extraction part 2, and the bypass connection part 3 in the photovoltaic module, and the corresponding setting position of the junction box 1 on the back panel of the photovoltaic module. Figure 4 shows a schematic diagram of the specific structure inside the junction box 1.

[0046] For the Figure 3 and Figure 4 shown wiring structure, a plurality of diversion holes 6 need to be correspondingly provided on the back panel of the photovoltaic module to realize the extraction of the bypass current extraction part 2 and the bypass connection part 3, as shown in Figure 3 shown. Therefore, in an optional embodiment, three diversion holes 6 are arranged at intervals on the back panel of the three-cut photovoltaic module; the three diversion holes 6 are linearly arranged along the extension direction of the bypass connection part 3; one end of each of the two bypass current extraction parts 2 passes through two diversion holes 6 located on both sides and is connected to a current extraction terminal 14; the two opposite extraction ends of the two bypass connection parts 3 pass through the middle diversion hole 6 and are respectively connected to two common wiring terminals 13.

[0047] In a further optional embodiment, as shown in 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 connection terminal 13. Exemplarily, one end of the bypass current lead-out portion 2 passes through the diversion holes 6 on both sides and is inserted into the insertion hole on the current lead-out terminal 14, thus realizing the connection between the bypass current lead-out portion 2 and the current lead-out terminal 14. Similarly, the two lead-out ends of the two bypass connection portions 3 facing each other pass through the middle diversion hole 6 and are respectively inserted into the insertion holes on the two common connection terminals 13, thus realizing the connection with the two common connection terminals 13.

[0048] It can be understood that for Figure 3 and Figure 4 the wiring structure, the bypass current lead-out portion 2 and the bypass connection portion 3 can be part of a bypass busbar encapsulated in the photovoltaic module, or an independent structure connected to the bypass busbar. Therefore, in a further optional embodiment, as Figure 4 shown, the bypass current lead-out portion 2 includes: a first diversion fold line 21 and a bypass busbar 22 encapsulated in the triple-cut photovoltaic module; the extending direction of the bypass busbar 22 is the same as the extending direction of the battery string in the triple-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 diversion fold line 21; the other end of the first diversion fold line 21 passes through the diversion hole 6 and is connected to the current lead-out terminal 14. In a further optional embodiment, for the convenience of installing the junction box 1, the first diversion fold line 21 and the bypass busbar 22 connected thereto are of an integral structure.

[0049] It can be understood that since the three diversion holes 6 are linearly arranged and the installation position of the bypass current lead-out portion 2 can be adjusted according to the actual situation, in the embodiment of the present invention, by moving the bypass current lead-out portion 2 to the adjacent position of the battery string group 001, the technical effect of encapsulating three diodes with only one junction box can be achieved. Exemplarily, comparing Figure 3 with Figure 1 the positions of the bypass current lead-out portion 2, it can be seen that although in the embodiment of the present invention, the two longitudinal bypass current lead-out portions 2 are both moved closer to the middle, it will not affect the structure that each bypass current lead-out portion 2 and a transverse bypass connection portion 3 together form a bypass circuit of a battery string group 001, so it will not affect the overall wiring structure. Therefore, in an optional embodiment of the present invention, in order to minimize the number of junction boxes 1 as much as possible, the number of junction boxes 1 is set to one; and the position of the junction box 1 corresponds to the three diversion holes 6.

[0050] In addition, the conventional busbar is usually a flat strip structure. Therefore, in the embodiment of the present invention, the shape of the insertion hole matches the cross-section of the busbar. Exemplarily, from Figure 4It can be seen that since the bypass current lead-out portion 2 is arranged longitudinally and the bypass connection portion 3 is arranged horizontally, after the bypass current lead-out portion 2 and the bypass connection portion 3 are vertically bent, the insertion holes on the current lead-out terminal 14 and the common connection terminal 13 are both rectangular, and the long side direction 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 direction of the rectangular insertion hole of the common connection 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 is only one implementation manner of the wiring structure applied to the three-cut photovoltaic module provided by the embodiment of the present invention. The wiring structure provided by the embodiment of the present invention can also be as Figures 6 to 8 shown. Among them, Figure 6 shows the positional relationship between the battery string group 001, the bypass current lead-out portion 2 and the bypass connection portion 3 in the photovoltaic module and the corresponding installation position of the junction box 1 on the back panel of the photovoltaic module, Figure 7 shows the specific structural schematic diagram inside the junction box 1, Figure 8 shows the specific structural schematic diagram of the second junction box 200 included in the junction box 1.

[0052] Specifically, Figure 6 The blue hollow circles in

[0053] show the installation positions of the bypass current lead-out portion 2 in this implementation manner. In an optional embodiment, the bypass current lead-out portion 2 can be a part of the positive bus bar 4 or the negative bus bar 5, that is, one bypass current lead-out portion 2 is the end lead-out section of the positive bus bar 4, and the other bypass current lead-out portion 2 is the end lead-out section of the negative bus bar 5. Since the bypass current lead-out portion 2 itself is also a conductive material similar to the bus bar, the consumption of raw materials can be reduced as much as possible in this case. In another optional embodiment, the bypass current lead-out portion 2 can also be a connection structure independently arranged outside the positive bus bar 4 and the negative bus bar 5. That is, similar to the aforementioned first diversion fold line 21, the bypass current lead-out portion 2 is a second diversion fold line with one end connected to the positive bus bar 4 or the negative bus bar 5. Figure 6 It can be understood that since the bypass current lead-out portion 2 and the bypass connection portion 3 in Figure 6As shown, it further includes: two diversion holes 6 provided on the back plate of the triple-cut photovoltaic module of the battery; the first diversion hole 61 among the two diversion holes 6 is provided between the positive bus bar 4 and the negative bus bar 5; the second diversion hole 62 among the two diversion holes 6 is provided between the two transverse bypass connection parts 3; one end of the bypass current extraction part 2 is connected to the positive bus bar 4 or the negative bus bar 5, and the other end passes through the first diversion hole 61 and is connected to a current extraction terminal 14; the extraction ends of the two transverse bypass connection parts 3 pass through the second diversion hole 62 and are respectively connected to two common connection terminals 13.

[0054] It can be understood that since the distance between the parallel bypass current extraction part 2 and the bypass connection part 3 is relatively far, if only one junction box 1 is provided at this time, there will be a problem that the volume of the junction box 1 is too large. Therefore, in the embodiment of the present invention, for such a wiring structure, as Figure 7 and Figure 8 shown, the number of junction boxes 1 is two, and the positions of the two junction boxes 1 correspond to the two diversion holes 6 respectively. In this case, the connection between the current extraction terminal 14, the first diode 11 and the common connection terminal 13 is realized by using the connecting wire between the two junction boxes 1. Specifically, as Figure 8 and Figure 6 the wiring structure obtained by combining or Figure 10 and Figure 6 shown by the wiring structure obtained by combining, a bypass circuit of the battery string group 001a is formed by a current extraction terminal 14 on the left, a first diode 11 on the left and a common connection terminal 13 on the left; a bypass circuit of the battery string group 001c is formed by a common connection terminal 13 on the left, a second diode 12 and a common connection terminal 13 on the right; a bypass circuit of the battery string group 001b is formed by a common connection terminal 13 on the right, a first diode 11 on the right and a current extraction terminal 14 on the right. Comparing Figure 7 and Figure 3 it can be seen that by shortening the longitudinally arranged part of the bypass current extraction part 2 in Figure 3 to the end of the positive bus bar 4 or the negative bus bar 5, and by increasing the length of the connecting wire between the current extraction terminal 14 and the first diode 11 in the junction box 1, the longitudinally arranged part of the bypass current extraction part 2 in Figure 3 is replaced, thereby realizing the circuit connection of the embodiment of the present invention.

[0055] It can be understood that not only can the length of the connecting wire between the current extraction terminal 14 and the first diode 11 in the junction box 1 be increased to replace Figure 3 the longitudinally arranged part of the bypass current extraction part 2 in Figure 3The partial bypass current extraction part 2 arranged longitudinally therein. Therefore, in addition to the Figure 7 shown junction box structure, it can also be the Figure 9 shown junction box structure, that is, in an alternative embodiment, two current extraction terminals 14 are arranged in the first junction box 100, two first diodes 11, one second diode 12 and two common connection terminals 13 are arranged in the second junction box 200; the first junction box 100 corresponds to the first diversion hole 61; the second junction box 200 corresponds to the second diversion hole 62; or, two current extraction terminals 14 and two first diodes 11 are arranged in the third junction box 300, one second diode 12 and two common connection terminals 13 are arranged in the fourth junction box 400; the third junction box 300 corresponds to the first diversion hole 61; the fourth junction box 400 corresponds to the second diversion hole 62. Further, Figure 10 shows the Figure 9 corresponding specific structure inside the junction box 1. It can be seen from Figure 10 that in this design structure, the connection line between the first diode 11 and the common connection terminal 13 is used to realize the electrical connection between the third junction box 300 and the fourth junction box 400.

[0056] In addition, the conventional bus bar is usually a flat strip structure. Therefore, in the embodiment of the present invention, the shape of the insertion hole matches the cross-section of the bus bar. Exemplarily, it can be seen from Figure 8 and Figure 10 that since both the bypass current extraction part 2 and the bypass connection part 3 are arranged horizontally, after the bypass current extraction part 2 and the bypass connection part 3 are vertically bent, the insertion holes on the current extraction terminal 14 and the common connection terminal 13 are both rectangular, and the long side direction of the rectangle is the same as the extension direction of the battery strings in the battery string group 001.

[0057] In a further alternative embodiment, as shown in Figure 4 , Figure 7 , Figure 9 , the junction box 1 further includes: a positive connector 16 and a negative connector 15 respectively connected to the two current extraction terminals 14; wherein, the current extraction terminal 14 and the positive connector 16 or the negative connector 15 are connected by a copper wire. It can be understood that since the function of the current extraction terminal 14 is to extract the current in the positive bus bar 4 and the negative bus bar 5, it is necessary to ensure the conductivity between the current extraction terminal 14 and the positive connector 16 and the negative connector 15, so a copper wire connection is required.

[0058] For the connection between the current extraction terminal 14 and the first diode 11, conduction occurs only when the battery string group 001 fails. Therefore, in an optional embodiment, for the structure where two current extraction terminals 14 are arranged in the first junction box 100 and two first diodes 11 are arranged in the second junction box 200, an aluminum wire is used to connect the current extraction terminal 14 and the first diode 11. Compared with the electrical conductivity of copper wire, the electrical conductivity of aluminum wire is poor, but it is cheap. Therefore, in the embodiment of the present invention, aluminum wire is used to connect the parts of the connection lines with lower usage rate, while copper wire is used to connect the parts of the connection lines with higher usage rate, which can not only ensure the photoelectric conversion efficiency of the photovoltaic module, but also appropriately reduce the consumption cost.

[0059] In a further optional embodiment, for the case where there are two junction boxes 1, it can also be as Figure 13 shown 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 where the first junction box 100 and the second junction box 200 face each other; and a plug-in part 800 matching the slot 700 is provided on the connection line between the current extraction terminal 14 and the first diode 11, so as to realize the connection between the first junction box 100 and the second junction box 200 after the plug-in part 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 where the third junction box 300 and the fourth junction box 400 face each other; and a plug-in part 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 plug-in part 800 is inserted into the slot 700. As Figure 13 can be seen, the plug-in part 800 provided on the connection line realizes the flexible plugging effect between the two junction boxes 1, that is, by adjusting the position and length of the connection line, the electrical connection between the two junction boxes 1 at different positions can be realized. Further, plug-in parts 800 can also be provided at both ends of the connection line, and slots 700 are provided on the opposite sides of the two junction boxes 1, that is, the plug-in parts 800 at both ends of the connection line are respectively plugged into the slots 700 on the two junction boxes 1, so as to realize the electrical connection between the two junction boxes 1.

[0060] In addition, for the installation positions of the positive bus bar 4 and the negative bus bar 5, in an optional embodiment, as Figure 11As shown, the positive busbar 4 and the negative busbar 5 are both arranged on the back side of the battery string group 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 the conductive member 003 folded along the edge side of the edge battery cell 002 in the battery string group 001, and a first insulating pad 500 is arranged between the conductive member 003 on the front side of the battery cell 002 and the back side of the battery cell 002 after being folded, so as to avoid the front conductive member 003 from connecting with the back side and causing a short circuit.

[0061] It is understandable that, since the positive busbar 4 and the negative busbar 5 are usually located at the edge of the photovoltaic module, when it is necessary to open the first guide hole 6 between the positive busbar 4 and the negative busbar 5, since the opening position is too close to the edge of the photovoltaic module, it is easy to cause hidden cracks at the edge of the back sheet when opening the hole. Therefore, in the embodiment of the present invention, the laying position of the positive busbar 4 and the negative busbar 5 is moved toward the center of the photovoltaic module, increasing the distance between the edge of the glass and the edge of the hole, thereby enhancing the strength of the glass.

[0062] In a further optional embodiment, if Figure 12 As shown, the bypass current lead-out portion 2 and / or the bypass connection portion 3 are arranged on the back side of the battery string group 001, and a second insulating pad 600 is arranged between the bypass current lead-out portion 2 and / or the bypass connection portion 3 and the battery string group 001. Exemplarily, Figure 12 Only the schematic diagram of the cross-sectional structure of the bypass current lead-out portion 2 is shown. For the cross-sectional structure of the bypass connection portion 3 , the cross-sectional structure of the bypass current lead-out portion 2 may be referred to for corresponding configuration.

[0063] In an optional embodiment, in order to avoid the influence on the photoelectric conversion efficiency of the battery string group 001 as much as possible, especially for the battery string group 001 for double-sided power generation, the first insulating pad 500 and / or the second insulating pad 600 is made of a transparent material, such as PET (polyethylene terephthalate), which has good resistance to ultraviolet yellowing and resistance to yellowing due to humidity and heat, and can maintain good light transmittance for long-term outdoor use without causing negative impact on the photoelectric conversion performance of the photovoltaic module.

[0064] In summary, the wiring structure for the three-cut photovoltaic module provided by the embodiment of the present invention, by providing two bypass current lead-out parts 2 and two bypass connection parts 3 respectively connected to each two adjacent battery string groups 001, only four lead-out parts need to be provided on the busbar to realize the parallel connection between the three battery string groups 001 and the three diodes, which effectively reduces the number of busbar lead-out parts and the number of bends. Moreover, by simultaneously providing two first diodes 11, one second diode 12, two common wiring 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 the automated process.

[0065] Example 1 (corresponding to Figure 3 and Figure 4 the wiring structure jointly formed)

[0066] A wiring structure applied to a three-cut battery photovoltaic module. The three-cut battery photovoltaic module is divided into three series-connected battery string groups 001. The wiring structure includes: a junction box, two bypass current lead-out parts 2, and two bypass connection parts 3 respectively connected to every two adjacent battery string groups 001. Three diversion holes 6 are arranged at intervals along the extending direction of the bypass connection part 3 on the backplane 005 of the three-cut battery photovoltaic module; among them,

[0067] The junction box includes: a current lead-out terminal 14 arranged in sequence, a first diode 11, a common wiring terminal 13, a second diode 12, a common wiring terminal 13, a first diode 11, a current lead-out terminal 14;

[0068] The upper end of the right bypass current lead-out part 3 is connected to the positive bus bar 4 of the three-cut battery photovoltaic module, and the lower end passes through the rightmost diversion hole 6 and is connected to the right current lead-out terminal 14;

[0069] The upper end of the left bypass current lead-out part 3 is connected to the negative bus bar 5 of the three-cut battery photovoltaic module, and the lower end passes through the leftmost diversion hole 6 and is connected to the left current lead-out terminal 14;

[0070] The two opposite lead-out ends of the left and right bypass connection parts 3 respectively pass through the middle diversion hole 6 and are connected to the two common wiring terminals 13;

[0071] A bypass current lead-out part, the current lead-out terminal it is connected to, the first diode, the common wiring terminal, and a horizontal bypass connection part form a bypass circuit of a battery string group 001; two horizontal bypass connection parts, the two common wiring terminals they are connected to, and the second diode form a bypass circuit of a battery string group 001.

[0072] Example 2 (corresponding to Figure 6 and Figure 7 the wiring structure jointly formed)

[0073] A wiring structure applied to a three-cut battery photovoltaic module. The three-cut battery photovoltaic module is divided into three series-connected battery string groups 001. The wiring structure includes: two junction boxes (the first junction box 100 and the second junction box 200 respectively), two bypass current lead-out parts 2, and two bypass connection parts 3 respectively connected to every two adjacent battery string groups 001. Two diversion holes 6 on the backplane 005 of the three-cut battery photovoltaic module; among them,

[0074] The first diversion hole 61 of the two diversion holes 6 is arranged between the positive bus bar 4 and the negative bus bar 5; the second diversion hole 62 of the two diversion holes 6 is arranged between the two bypass connection parts 3;

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

[0076] The second junction box 200 is arranged corresponding to the second diversion hole 62 and includes: a first diode 11, a common connection terminal 13, a second diode 12, a common connection terminal 13, and a first diode 11 arranged in sequence;

[0077] Wherein, one current lead-out terminal 14 on the left side in the first junction box 100 is connected to one first diode 11 on the left side in the second junction box 200, and the other current lead-out terminal 14 on the right side in the first junction box 100 is connected to the other first diode 11 on the right side in the second junction box 200;

[0078] The two bypass current lead-out parts 3 are respectively the right end of the positive bus bar 4 and the left end of the negative bus bar 5; wherein, the right end of the positive bus bar 4 passes through the first diversion hole 61 and is connected to the current lead-out terminal 14 on the left side in the first junction box 100, and the left end of the negative bus bar 5 passes through the first diversion hole 61 and is connected to the current lead-out terminal 14 on the right side in the first junction box 100;

[0079] The two opposite lead-out ends of the left and right bypass connection parts 3 respectively pass through the middle second diversion hole 62 and are connected to the two common connection terminals 13;

[0080] One bypass current lead-out part, the current lead-out terminal it is connected to, the first diode, the common connection terminal, and one transverse bypass connection part constitute a bypass circuit of a battery string group 001; the two transverse bypass connection parts, the two common connection terminals they are connected to, and the second diode constitute a bypass circuit of a battery string group 001.

[0081] Embodiment 3 (corresponding to Figure 6 and Figure 9 jointly formed wiring structure)

[0082] A wiring structure applied to a three-cut battery photovoltaic module. The three-cut battery photovoltaic module is divided into three series-connected battery string groups 001. The wiring structure includes: two junction boxes (the first junction box 100 and the second junction box 200 respectively), two bypass current lead-out parts 2, and two bypass connection parts 3 respectively connected to every two adjacent battery string groups 001, and two diversion holes 6 on the backplane 005 of the three-cut battery photovoltaic module; wherein,

[0083] The first diversion hole 61 of the two diversion holes 6 is arranged between the positive bus bar 4 and the negative bus bar 5; the second diversion hole 62 of the two diversion holes 6 is arranged between the two lateral bypass connection parts 3;

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

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

[0086] Wherein, one current lead terminal in the first junction box 100 is connected to one first diode, and one first diode in the first junction box 100 is connected to one common connection terminal in the second junction box 200;

[0087] The two bypass current lead parts 3 are respectively the right end of the positive bus bar 4 and the left end of the negative bus bar 5; wherein, the right end of the positive bus bar 4 passes through the first diversion hole 61 and is connected to the left current lead terminal 14 in the first junction box 100, and the left end of the negative bus bar 5 passes through the first diversion hole 61 and is connected to the right current lead terminal 14 in the first junction box 100;

[0088] The two opposite lead-out ends of the left and right lateral bypass connection parts 3 respectively pass through the middle second diversion hole 62 and are connected to the two common connection terminals 13;

[0089] One bypass current lead part, the current lead terminal it is connected to, the first diode, the common connection terminal and one lateral bypass connection part form a bypass circuit of a battery string group 001; the two lateral bypass connection parts, the two common connection terminals they are connected to and the second diode form a bypass circuit of a battery string group 001.

[0090] The embodiment of the present invention also provides the following technical solutions:

[0091] Technical solution 1. A wiring structure applied to a battery three-cut photovoltaic module, characterized in that the battery three-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 parts 2 and two bypass connection parts 3 respectively connected to every two adjacent battery string groups, wherein,

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

[0093] Both ends of the first diode 11 are respectively connected to one of the common connection terminals 13 and one of the current lead-out terminals 14;

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

[0095] Both ends of one bypass current lead-out part 2 are respectively connected to the positive bus bar 4 of the triple-cut photovoltaic module and one of the current lead-out terminals 14;

[0096] Both ends of the other bypass current lead-out part 2 are respectively connected to the negative bus bar 5 of the triple-cut photovoltaic module and the other current lead-out terminal 14;

[0097] The lead-out ends of the two bypass connection parts 3 are respectively connected to two of the common connection terminals 13;

[0098] One bypass current lead-out part 2, the current lead-out terminal 14 it is connected to, the first diode 11, the common connection terminal 13, and one of the horizontal bypass connection parts 3 form a bypass circuit of one battery string group;

[0099] The two horizontal bypass connection parts 3, the two common connection terminals 13 they are connected to, and the second diode 12 form a bypass circuit of one battery string group.

[0100] Technical solution 2. The wiring structure according to technical solution 1, characterized in that it further includes: three diversion holes 6 arranged at intervals on the back plate of the triple-cut photovoltaic module;

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

[0102] One ends of the two bypass current lead-out parts 2 respectively pass through two of the diversion holes 6 located on both sides and are connected to one of the current lead-out terminals 14;

[0103] The two opposite lead-out ends of the two bypass connection parts 3 pass through the middle diversion hole 6 and are respectively connected to two of the common connection terminals 13.

[0104] Technical solution 3. The wiring structure according to technical solution 2, characterized in that the bypass current lead-out part 2 includes: a first diversion fold line 21 and a bypass bus bar 22 encapsulated in the triple-cut photovoltaic module;

[0105] The extension direction of the bypass bus bar 22 is the same as the extension direction of the battery string in the triple-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 diversion fold line 21;

[0107] The other end of the first diversion fold line 21 passes through the diversion 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 the first diversion fold line 21 and the bypass busbar 22 connected thereto are of an integral structure.

[0109] Technical solution 5. The wiring structure according to any one of technical solutions 2 to 4, characterized in that

[0110] The number of the junction boxes 1 is one;

[0111] The position of the junction box 1 corresponds to the three diversion holes.

[0112] Technical solution 6. The wiring structure according to technical solution 1, characterized in that it further includes: two diversion holes 6 provided on the back plate of the triple-cut photovoltaic module;

[0113] The first diversion hole 61 in the two diversion holes 6 is provided between the positive busbar 4 and the negative busbar 5;

[0114] The second diversion hole 62 in the two diversion holes 6 is provided between the two lateral bypass connection parts 3;

[0115] 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 diversion hole 61 and is connected to one of the current lead-out terminals 14;

[0116] The lead-out ends of the two lateral bypass connection parts 3 pass through the second diversion hole 62 and are respectively connected to the two common connection terminals 13.

[0117] Technical solution 7. The wiring structure according to technical solution 6, characterized in that

[0118] The bypass current lead-out part 2 is a second diversion fold line with one end connected to the positive busbar 4 or the negative busbar 5;

[0119] The other end of the second diversion fold line passes through the diversion hole 6 and is connected to the current lead-out terminal 14;

[0120] Or,

[0121] One of the bypass current lead-out parts 2 is the end lead-out section of the positive bus bar 4, and the other bypass current lead-out part 2 is the end lead-out section of the negative bus bar 5.

[0122] Technical solution 8. The wiring structure according to any one of technical solutions 6 to 7, characterized in that

[0123] The number of the junction boxes 1 is two, and the positions of the two junction boxes 1 respectively correspond to the two diversion holes 6.

[0124] Technical solution 9. The wiring structure according to technical solution 8, characterized in that

[0125] The two current lead-out terminals 14 are arranged in the first junction box 100, the two first diodes 11, one second diode 12 and the two common wiring terminals 13 are arranged in the second junction box 200;

[0126] The first junction box 100 corresponds to the first diversion hole 61;

[0127] The second junction box 200 corresponds to the second diversion hole 62;

[0128] Or,

[0129] The two current lead-out terminals 14 and the two first diodes 11 are arranged in the third junction box 300, one second diode 12 and the two common wiring terminals 13 are arranged in the fourth junction box 400;

[0130] The third junction box 300 corresponds to the first diversion hole 61;

[0131] The fourth junction box 400 corresponds to the second diversion hole 62.

[0132] Technical solution 10. The wiring structure according to technical solution 1, characterized in that

[0133] The junction box 1 further includes: a negative wiring connector 15 and a positive wiring connector 16 respectively connected to the two current lead-out terminals 14;

[0134] Wherein, a copper wire is used to connect the current lead-out terminal 14 and the negative wiring connector 15 or the positive wiring connector 16.

[0135] Technical solution 11. The wiring structure according to technical solution 9, characterized in that

[0136] For the structure in which the two current lead-out terminals 14 are arranged in the first junction box 100 and the two first diodes 11 are arranged in the second junction box 200,

[0137] The current extraction terminal 14 and the first diode 11 are connected by an aluminum wire.

[0138] Technical solution 12. The wiring structure according to technical solution 1, characterized in that

[0139] Both the positive bus bar 4 and the negative bus bar 5 are arranged on the back side of the battery string group; wherein, the positive bus bar 4 or the negative bus bar 5 is connected to the fine grid on the front of the battery string group through a conductive member folded along the edge of the battery string group, and a first insulating pad 500 is arranged between the fine grid on the front of the battery string group and the back of the battery string group;

[0140] and / or

[0141] The bypass current extraction part 2 and / or the bypass connection part 3 are arranged on the back side of the battery string group, and a second insulating pad 600 is arranged between the bypass current extraction part 2 and / or the bypass connection part 3 and the battery string group.

[0142] Technical solution 13. The wiring structure according to technical solution 12, characterized in that

[0143] The first insulating pad 500 and / or the second insulating pad 600 are made of a transparent material.

[0144] Technical solution 14. The wiring structure according to technical solution 9, characterized in that

[0145] 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 where the first junction box 100 and the second junction box 200 face each other;

[0146] And a plug-in member 800 matching the slot 700 is provided on the connection line between the current extraction terminal 14 and the first diode 11, so as to realize the connection between the first junction box 100 and the second junction box 200 after the plug-in member 800 is inserted into the slot 700;

[0147] Or,

[0148] 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 where the third junction box 300 and the fourth junction box 400 face each other;

[0149] A plug-in member 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 plug-in member 800 is inserted into the slot 700.

[0150] The introduction provided in the above steps is only used to help understand the structure, method and core idea of the present invention. For those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

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

2. The wiring structure according to claim 1, characterized in that: Also includes: Three guide holes (6) are arranged at intervals 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 portion (3); One end of the two bypass current lead-out parts (2) passes through the two guide holes (6) located on both sides, respectively, and is connected to one current lead-out terminal (14); The two leading ends of the two bypass connection parts (3) facing each other pass through the middle flow guide hole (6) and are respectively connected to the two common connection terminals (13).

3. The wiring structure according to claim 2, characterized in that: The bypass current lead-out portion (2) comprises: a first current guiding fold line (21) and a bypass current collecting strip (22) encapsulated in the three-cut photovoltaic module; The extension direction of the bypass busbar (22) is consistent with the extension direction of the battery string in the three-cell 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 current guide 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).

4. The wiring structure according to claim 2, characterized in that: The first flow guiding fold line (21) and the bypass flow collecting strip (22) connected thereto are an integral structure.

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

6. The wiring structure according to claim 1, characterized in that: Also includes: Two guide holes (6) are arranged on the back plate of the three-cut photovoltaic module; The first flow guide hole (61) of the two flow guide holes (6) is arranged between the positive electrode busbar (4) and the negative electrode busbar (5); The second flow guide hole (62) of the two flow guide holes (6) is arranged between the two transverse bypass connecting parts (3); One end of the bypass current lead-out portion (2) is connected to the positive electrode busbar (4) or the negative electrode 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 lead-out ends of the two transverse bypass connecting parts (3) pass through the second flow guide hole (62) and are respectively connected to the two common wiring terminals (13).

7. The wiring structure according to claim 6, characterized in that: The bypass current lead-out portion (2) is a second current guide fold line with one end connected to the positive electrode busbar (4) or the negative electrode 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 portions (2) is an end lead-out section of the positive electrode busbar (4), and the other of the bypass current lead-out portions (2) is an end lead-out section of the negative electrode busbar (5).

8. The wiring structure according to any one of claims 6 to 7, characterized in that: The number of the junction boxes (1) is two, and the positions of the two junction boxes (1) are respectively arranged corresponding to the two guide holes (6).

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

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

Images