Connection structure of junction box and busbar and photovoltaic module

Abstract

The present application provides a connection structure between a junction box and a busbar and a photovoltaic module. The connection structure between the junction box and the busbar includes a junction box, a busbar and a conductive connector. The busbar extends into the junction box and corresponds to the conductive sheet in the junction box one by one. The busbar and the corresponding conductive sheet are connected and pressed to conduct through the conductive connector. The connection structure between the junction box and the busbar provided by the present application directly presses the busbar to the conductive sheet in the junction box through the conductive connector, thereby realizing the conductive connection between the busbar and the conductive sheet in the junction box. Since the busbar and the junction box are already conductive after being connected through the conductive connector, there is no need to weld the busbar and the junction box, which fundamentally avoids the occurrence of cold welding and ensures the connection quality between the busbar and the junction box.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a connection structure between a junction box and a bus bar and a photovoltaic assembly. Background Art

[0002] Photovoltaic modules are usually encapsulated by a backplane, a lower film, a battery string assembly, an upper film, and a glass plate. The current generated by the photovoltaic module through photoelectric conversion needs to be conducted through a junction box. The traditional way to install a junction box is to insert the busbar on the battery string assembly into the junction box, and then weld the busbar to the conductive sheet of the junction box through a welding device. The conductive connection between the busbar and the conductive sheet by welding cannot avoid the occurrence of cold solder joints, which may cause the busbar and the conductive sheet to be unable to be conductive, resulting in the failure of the junction box installation. Utility Model Content

[0003] In order to solve the above technical problems existing in the existing connection between the junction box and the bus bar by welding, the present application provides a connection structure between the junction box and the bus bar, which adopts the following technical solutions:

[0004] A connection structure between a junction box and a busbar comprises a junction box, a busbar and a conductive connector. The busbar extends into the junction box and corresponds one-to-one with the conductive sheets in the junction box. The busbar and the corresponding conductive sheets are connected and pressed together through the conductive connector to achieve conduction.

[0005] The connection structure between the junction box and the bus bar provided in the present application directly crimps the bus bar to the conductive sheet in the junction box through a conductive connector, thereby realizing a conductive connection between the bus bar and the conductive sheet in the junction box. Since the bus bar and the junction box are already conductive after being connected through the conductive connector, there is no need to weld the bus bar and the junction box, which fundamentally avoids the occurrence of cold solder joints and ensures the connection quality between the bus bar and the junction box.

[0006] In some embodiments, a threaded hole is provided on the conductive sheet, and a first through hole is provided on the bus bar at a position corresponding to the threaded hole; the conductive connector includes a screw matching the threaded hole, the screw is conductive, and the screw passes through the first through hole and is screwed into the threaded hole, thereby pressing the bus bar against the conductive sheet.

[0007] A conductive connector with a simple structure is provided, which uses a screw to lock a bus bar on a conductive sheet, so that the bus bar and the conductive sheet form an electrical contact. In addition, since the screw itself is conductive, it can achieve electrical conduction between the bus bar and the conductive sheet, ensuring that the bus bar and the conductive sheet are electrically connected.

[0008] In some embodiments, the screw locks at least three threads of the threaded hole.

[0009] The screw connection strength between the screw and the conductive sheet is ensured, ensuring that the busbar is firmly pressed against the conductive sheet to form a stable electrical contact with the conductive sheet.

[0010] In some embodiments, a thickened area is formed at the portion of the conductive sheet corresponding to the threaded hole, and the thickness of the thickened area is greater than or equal to three times the pitch of the threaded hole; or, the thickness of the conductive sheet at each portion is equal, and the thickness of the conductive sheet is greater than or equal to three times the pitch of the threaded hole.

[0011] In order to smoothly open a threaded hole on the conductive sheet and ensure that the threaded hole can lock the screw, the thickness of the portion of the conductive sheet where the threaded hole is opened must be greater than or equal to three times the pitch of the threaded hole. To this end, two simple and feasible solutions are provided. One solution is to perform thickening treatment on the portion of the conductive sheet corresponding to the threaded hole to form a thickened area with a thickness greater than or equal to three times the pitch of the threaded hole. Another solution is to perform overall thickening on the conductive sheet, or directly use a thicker conductive sheet to ensure that the thickness of the conductive sheet is greater than or equal to three times the pitch of the threaded hole.

[0012] In some embodiments, the screw includes a clamping head and a screw rod, the clamping head is connected to the upper end of the screw rod, the bottom of the clamping head is formed with a clamping surface located on the circumferential side of the screw rod, and the length of the screw rod is less than or equal to the distance between the upper surface of the bus bar and the upper surface of the battery string assembly; after the screw rod passes through the first through hole and is screwed to the threaded hole, the clamping surface is pressed against the upper surface of the bus bar.

[0013] By setting the screw, after the screw rod of the screw passes through the first through hole and is screwed to the threaded hole, the pressing surface is pressed against the upper surface of the bus bar and presses downward, thereby firmly and stably pressing the bus bar against the upper surface of the bus bar. In addition, since the length of the screw rod is less than or equal to the distance between the upper surface of the bus bar and the upper surface of the battery string assembly, the end of the screw rod will not contact the battery string assembly, thereby preventing the screw rod from damaging the battery cells in the battery string assembly.

[0014] In some embodiments, a second through hole is provided on the conductive sheet, and a third through hole is provided at a position of the busbar corresponding to the second through hole; the conductive connector includes a screw and a nut that match each other, and both the screw and the nut are conductive, wherein the nut is connected to the surface of the conductive sheet facing away from the busbar and is connected to the second through hole, and the screw passes through the third through hole and the second through hole and is screwed into the nut to press the busbar against the conductive sheet.

[0015] The busbar is locked on the conductive sheet by matching screws and nuts, so that the busbar and the conductive sheet are in electrical contact. In addition, since both the screws and nuts are conductive, the screws and nuts can achieve electrical conduction between the busbar and the conductive sheet, ensuring a stable electrical connection between the busbar and the conductive sheet. In addition, since there is no need to set a threaded hole for locking the screw on the conductive sheet, there is no need to thicken the conductive sheet.

[0016] In some embodiments, the nut is welded or riveted to the surface of the conductive sheet facing away from the bus bar.

[0017] Welding or riveting can ensure that the nut is firmly connected to the surface of the conductive sheet.

[0018] In some embodiments, the screw includes a clamping head and a screw rod, the clamping head is connected to the upper end of the screw rod, the bottom of the clamping head is formed with a clamping surface located on the circumferential side of the screw rod, and the length of the screw rod is less than or equal to the distance between the upper surface of the bus bar and the upper surface of the battery string assembly; after the screw rod passes through the third through hole and the second through hole and is screwed to the nut, the clamping surface is pressed against the upper surface of the bus bar.

[0019] By setting the screw, after the screw rod of the screw passes through the third through hole and the second through hole and is screwed to the nut, the pressing surface is pressed against the upper surface of the bus bar and presses downward, thereby firmly and stably pressing the bus bar against the upper surface of the bus bar. In addition, since the length of the screw rod is less than or equal to the distance between the upper surface of the bus bar and the upper surface of the battery string assembly, the end of the screw rod will not contact the battery string assembly, thereby preventing the screw rod from damaging the battery cells in the battery string assembly.

[0020] The present application also provides a photovoltaic assembly, which includes the connection structure between the junction box and the bus bar as described in any one of the above items.

[0021] In the photovoltaic module provided by the present application, the bus bar on the battery string assembly is directly crimped onto the conductive sheet in the junction box through a conductive connector, thereby realizing a conductive connection between the bus bar and the conductive sheet in the junction box. Since the bus bar and the junction box are already conductive after being connected through the conductive connector, there is no need to weld the bus bar and the junction box, which fundamentally avoids the occurrence of cold solder joints and ensures the connection quality between the bus bar and the junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic side view of the connection structure between the junction box and the bus bar of the first embodiment of the present application;

[0023] Figure 2 This is a schematic top view of the connection structure between the junction box and the busbar of the first embodiment of the present application;

[0024] Figure 3 for Figure 2AA section view;

[0025] Figure 4 It is a schematic diagram of the structure of the screw in the embodiment of the present application;

[0026] Figure 5 A schematic top view of a connection structure between a junction box and a bus bar according to a second embodiment of the present application;

[0027] Figure 6 for Figure 5 BB cross-sectional view;

[0028] Figure 7 This is a schematic top view of a connection structure between a junction box and a bus bar according to a third embodiment of the present application;

[0029] Figure 8 for Figure 7 CC cross-sectional view.

[0030] Figures 1 to 8 The utility model comprises: a junction box 1, a bus bar 2, a conductive sheet 3, a thickened area 31, a screw 4, a clamping head 41, a screw rod 42, a clamping surface 43, and a nut 5. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] like Figures 1 to 3 As shown, the connection structure between the junction box and the busbar in the embodiment of the present application includes a junction box 1, a busbar 2 and a conductive connector, wherein the busbar 2 extends into the junction box 1 and corresponds one-to-one with the conductive sheet 3 in the junction box 1. Figures 1 to 3 In the illustrated embodiment, two conductive sheets 3 are arranged in the junction box 1 , and two bus bars 2 extend into the junction box 1 and correspond to the two conductive sheets 3 one by one.

[0033] The busbar 2 and the corresponding conductive sheet 3 are connected and pressed together through a conductive connector to achieve conduction.

[0034] The connection structure between the junction box and the busbar of the embodiment of the present application directly presses the busbar 2 onto the conductive sheet 3 in the junction box 1 through the conductive connector, thereby realizing the conductive connection between the busbar 2 and the conductive sheet 3 in the junction box 1. Since the busbar 2 and the junction box 1 are already conductive after being connected through the conductive connector, there is no need to weld the busbar 2 and the junction box 1, which fundamentally avoids the occurrence of cold welding and ensures the connection quality between the busbar 2 and the junction box 1.

[0035] Optionally, a threaded hole is provided on the conductive sheet 3, and a first through hole is provided on the busbar 2 at a position corresponding to the threaded hole. The conductive connector includes a screw 4 that matches the threaded hole, and the screw 4 is conductive. The screw 4 passes through the first through hole and is screwed into the threaded hole, thereby pressing the busbar 2 onto the conductive sheet 3. The busbar 2 is locked onto the conductive sheet 3 by the screw 4, so that the busbar 2 and the conductive sheet 3 form an electrical contact. In addition, since the screw 4 is conductive, it can realize electrical conduction between the busbar 2 and the conductive sheet 3, ensuring that the busbar 2 and the conductive sheet 3 are electrically connected.

[0036] Optionally, in order to ensure the threading strength between the screw 4 and the conductive sheet 3 and to ensure that the bus bar 2 is firmly and stably pressed against the conductive sheet 3 and forms a stable electrical contact with the conductive sheet 3, the screw 3 locks at least three threads of the threaded hole.

[0037] In order to smoothly open a threaded hole on the conductive sheet 3 and ensure that the threaded hole can lock the screw 4 , the thickness of the conductive sheet 3 where the threaded hole is opened must be greater than or equal to three times the pitch of the threaded hole.

[0038] To achieve this goal, Figure 3 As shown, optionally, the conductive sheet 3 may be thickened at a location corresponding to the threaded hole to form a thickened area 31 having a thickness greater than or equal to three times the pitch of the threaded hole. Figures 5 and 6 As shown, the conductive sheet 3 may be thickened as a whole, or a thicker conductive sheet 3 may be directly used, thereby ensuring that the thickness of the conductive sheet 3 is greater than or equal to three times the pitch of the threaded hole.

[0039] like Figure 4 As shown, optionally, the screw 4 includes a clamping head 41 and a screw rod 42, the clamping head 41 is connected to the upper end of the screw rod 42, and the bottom of the clamping head 41 is formed with a clamping surface 43 located on the circumferential side of the screw rod 42. In particular, the length of the screw rod 42 is less than or equal to the distance between the upper surface of the busbar 2 and the upper surface of the battery string assembly. After the screw rod 42 passes through the first through hole and is screwed to the threaded hole, the clamping surface is pressed against the upper surface of the busbar 2. Among them, the upper surface of the busbar 2 refers to the upward surface of the busbar 2 after the busbar 2 is pressed against the corresponding conductive sheet 3.

[0040] By setting the screw 4, after the screw rod 42 of the screw 4 passes through the first through hole and is screwed to the threaded hole, the pressing surface 43 is pressed against the upper surface of the bus bar 2 and presses downward, thereby firmly and stably pressing the bus bar 2 against the upper surface of the bus bar 2. In addition, since the length of the screw rod 42 is less than or equal to the distance between the upper surface of the bus bar 2 and the upper surface of the battery string assembly, the end of the screw rod 42 will not contact the battery string assembly, thereby preventing the screw rod 42 from damaging the battery cells in the battery string assembly.

[0041] Optionally, the pressing surface 43 may be a smooth plane, or a rough surface with a plurality of protrusions. When the pressing surface 43 has protrusions, after the screw 4 is tightened, the protrusions may be pressed into the bus bar 2 , further improving the tightening effect of the screw 4 .

[0042] like Figures 7 and 8 As shown, in another embodiment, a second through hole is provided on the conductive sheet 3, and a third through hole is provided at a position of the busbar 2 corresponding to the second through hole. The conductive connector includes a screw 4 and a nut 5 that match each other, and both the screw 4 and the nut 5 are conductive, wherein the nut 5 is connected to the surface of the conductive sheet 3 that is away from the busbar 2 and is connected to the second through hole. The screw 4 passes through the third through hole and the second through hole and is screwed into the nut 5 to press the busbar 2 onto the conductive sheet 3.

[0043] The busbar 2 is locked on the conductive sheet 3 by the screws 4 and nuts 5 that match each other, so that the busbar 2 forms an electrical contact with the conductive sheet 3. In addition, since both the screws 4 and the nuts 5 are conductive, the screws 4 and the nuts 5 can achieve electrical conduction between the busbar 2 and the conductive sheet 3, ensuring that the busbar 2 and the conductive sheet 3 are electrically connected.

[0044] Optionally, the nut 5 is welded or riveted on the surface of the conductive sheet 3 that is away from the busbar. Welding or riveting can ensure that the nut 5 is firmly connected to the surface of the conductive sheet 3.

[0045] Same as the above-mentioned embodiment, Figure 4 As shown, the screw 4 in this embodiment includes a clamping head 41 and a screw rod 42, the clamping head 41 is connected to the upper end of the screw rod 42, and the bottom of the clamping head 41 is formed with a clamping surface 43 located on the circumference of the screw rod 42. In particular, the length of the screw rod 42 is less than or equal to the distance between the upper surface of the bus bar 2 and the upper surface of the battery string assembly. After the screw rod 42 passes through the third through hole and the second through hole and is screwed to the nut 5, the clamping surface 43 is pressed against the upper surface of the bus bar 2.

[0046] After the screw rod 42 of the screw 4 passes through the third through hole and the second through hole and is screwed to the nut 5, the pressing surface 43 is pressed against the upper surface of the bus bar 2 and presses downward, thereby firmly and stably pressing the bus bar 2 against the upper surface of the bus bar 2. In addition, since the length of the screw rod 42 is less than or equal to the distance between the upper surface of the bus bar 2 and the upper surface of the battery string assembly, the end of the screw rod 42 will not contact the battery string assembly, thereby preventing the screw rod 42 from damaging the battery cells in the battery string assembly.

[0047] Also optionally, the pressing surface 43 may be a smooth plane, or a rough surface with a plurality of protrusions. When the pressing surface 43 has protrusions, after the screw 4 is tightened, the protrusions may be pressed into the bus bar 2 , further improving the tightening effect of the screw 4 .

[0048] The embodiment of the present application also provides a method for connecting a junction box and a bus bar, which comprises: connecting a conductive sheet of the junction box and a bus bar of a battery string assembly through a conductive connector and pressing them to conduct.

[0049] Since the conductive sheet of the junction box and the busbar of the battery string assembly are connected and pressed together through the conductive connector, there is no need to weld the busbar and the junction box, which fundamentally avoids the occurrence of cold welding and ensures the connection quality between the busbar and the junction box.

[0050] In one embodiment, the conductive sheet of the junction box is connected to the bus bar of the battery string assembly through a conductive connector and pressed to conduct, including the following steps:

[0051] S11. Open a threaded hole on the conductive plate of the junction box.

[0052] S12, opening a first through hole on the bus bar.

[0053] S13, using a conductive screw as a conductive connecting member, and allowing the conductive screw to pass through the first through hole and then be locked in the threaded hole.

[0054] Among them, S11 can be performed before the busbar is inserted into the junction box, or after it is inserted; S12 can be performed before the busbar is welded to the battery string assembly, or after the busbar is welded to the battery string assembly. Step S11 and step S12 can be performed simultaneously, or step S11 is performed before step S12, or step S12 is performed before step S11.

[0055] The busbar is locked on the conductive sheet by the conductive screw, so that the busbar and the conductive sheet form a stable electrical contact. In addition, since the conductive screw itself is conductive, it can achieve electrical conduction between the busbar and the conductive sheet, ensuring that the busbar and the conductive sheet are electrically connected.

[0056] In order to ensure that the conductive screw is stably locked in the threaded hole after passing through the first through hole, the conductive sheet may be thickened at the position corresponding to the threaded hole to form a thickened area, and the thickness of the thickened area is greater than or equal to three times the pitch of the threaded hole. Alternatively, the conductive sheet may be thickened as a whole so that the thickness of the conductive sheet is greater than or equal to three times the pitch of the threaded hole.

[0057] In another optional embodiment, the conductive sheet of the junction box and the bus bar of the battery string assembly are connected and pressed together through a conductive connector, including the following steps:

[0058] S21. A second through hole is formed on the conductive sheet of the junction box, and a conductive nut is fixed on a surface of the conductive sheet of the junction box that is away from the bus bar.

[0059] S22. Open a third through hole on the bus bar.

[0060] S23, using a conductive screw as a conductive connecting piece, passing the conductive screw through the third through hole and the second through hole and then locking it in the conductive nut.

[0061] Among them, S21 is preferably performed before the busbar is inserted into the junction box; S22 can be performed before the busbar is welded to the battery string assembly, or after the busbar is welded to the battery string assembly. Step S21 and step S22 can be performed simultaneously, or step S21 is performed before step S22, or step S22 is performed before step S21.

[0062] The busbar is locked on the conductive sheet by matching conductive screws and conductive nuts, so that the busbar and the conductive sheet form a stable electrical contact. In addition, since both the conductive screws and the conductive nuts are conductive, they can achieve electrical conduction between the busbar and the conductive sheet, ensuring that the busbar and the conductive sheet are electrically connected. Since there is no need to set a threaded hole for locking the conductive screw on the conductive sheet, there is no need to implement thickening treatment on the conductive sheet.

[0063] The embodiment of the present application also provides a photovoltaic assembly, which includes the connection structure of the junction box and the busbar in any of the above embodiments. In the photovoltaic assembly in the embodiment of the present application, the busbar on the battery string assembly is directly crimped onto the conductive sheet in the junction box through a conductive connector, thereby realizing the conductive connection between the busbar and the conductive sheet in the junction box. Since the busbar and the junction box are already conductive after being connected through the conductive connector, there is no need to weld the busbar and the junction box, which fundamentally avoids the occurrence of cold welding and ensures the connection quality between the busbar and the junction box.

[0064] The above description of the present application is sufficiently detailed and has certain particularities. Those skilled in the art should understand that the description in the embodiments is merely exemplary, and all changes made without departing from the true spirit and scope of the present application should fall within the scope of protection of the present application. The scope of protection claimed in the present application is defined by the claims, not by the above description in the embodiments. Moreover, the embodiments mentioned in the present application are not limited to being implemented individually, and some embodiments can also be implemented in combination.

Claims

1. A connection structure between a junction box and a bus bar, characterized in that: The connection structure between the junction box and the busbar includes a junction box, a busbar and a conductive connector. The busbar extends into the junction box and corresponds one-to-one with the conductive sheets in the junction box. The busbar and the corresponding conductive sheets are connected and pressed together through the conductive connector.

2. The connection structure between the junction box and the bus bar according to claim 1, characterized in that: The conductive sheet is provided with a threaded hole, and the bus bar is provided with a first through hole at a position corresponding to the threaded hole; The conductive connector includes a screw matched with the threaded hole. The screw is conductive. The screw passes through the first through hole and is screwed into the threaded hole to press the busbar onto the conductive sheet.

3. The connection structure between the junction box and the bus bar according to claim 2, characterized in that: The screw locks at least three threads of the threaded hole.

4. The connection structure between the junction box and the bus bar according to claim 2, characterized in that: The thickness of the conductive sheet at least at a portion corresponding to the threaded hole is greater than or equal to three times the pitch of the threaded hole.

5. The connection structure between the junction box and the bus bar according to claim 4, characterized in that: A thickened area is formed at a position of the conductive sheet corresponding to the threaded hole, and a thickness of the thickened area is greater than or equal to three times the pitch of the threaded hole; or, The thickness of each part of the conductive sheet is equal, and the thickness of the conductive sheet is greater than or equal to three times the pitch of the threaded hole.

6. The connection structure of the junction box and the busbar according to claim 2, characterized in that: The screw comprises a clamping head and a screw rod, wherein the clamping head is connected to the upper end of the screw rod, a clamping surface is formed at the bottom of the clamping head and is located at the circumference of the screw rod, and the length of the screw rod is less than or equal to the distance between the upper surface of the bus bar and the upper surface of the battery string assembly; After the screw rod passes through the first through hole and is screwed to the threaded hole, the pressing surface is pressed against the upper surface of the bus bar.

7. The connection structure of the junction box and the busbar according to claim 1, characterized in that: The conductive sheet is provided with a second through hole, and the bus bar is provided with a third through hole at a position corresponding to the second through hole; The conductive connector includes a screw and a nut that match each other, both of which are conductive, wherein the nut is connected to the surface of the conductive sheet facing away from the busbar and is connected to the second through hole, and the screw passes through the third through hole and the second through hole and is screwed into the nut to press the busbar onto the conductive sheet.

8. The connection structure between the junction box and the bus bar according to claim 7, characterized in that: The nut is welded or riveted to a surface of the conductive sheet facing away from the bus bar.

9. The connection structure of the junction box and the bus bar according to claim 7, characterized in that: The screw includes a clamping head and a screw rod, the clamping head is connected to the upper end of the screw rod, the bottom of the clamping head is formed with a clamping surface located on the circumference of the screw rod, and the length of the screw rod is less than or equal to the distance between the upper surface of the bus bar and the upper surface of the battery string assembly; After the screw rod passes through the third through hole and the second through hole and is screwed to the nut, the pressing surface is pressed against the upper surface of the bus bar.

10. A photovoltaic module, characterized in that: The photovoltaic assembly comprises the connection structure of a junction box and a bus bar according to any one of claims 1 to 9.

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