Junction box and photovoltaic module

Abstract

The utility model relates to a junction box and a photovoltaic module. The junction box comprises a bypass module; the conductive pieces are arranged on the two sides of the bypass module; the welding part is arranged in the conductive piece, and the welding part is provided with a welding flux containing cavity; and the bottom of the solder accommodating cavity is provided with a convergence piece through hole, so that the convergence piece passes through the convergence piece through hole and is welded with the conductive piece through solder in the solder accommodating cavity. According to the junction box, the welding part with the welding flux containing cavity is arranged, the welding flux containing cavity can be used for containing the welding flux during welding, welding flux loss caused by flowing of the welding flux on the surface of the conductive part can be avoided, and it can be ensured that the confluence part is stably welded to the conductive part through the welding flux in the welding flux containing cavity after penetrating through the confluence part penetrating hole; the phenomenon of pseudo soldering is avoided, and the welding effect is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular, to a junction box and a photovoltaic module. Background Art

[0002] Welding, as a common process, is widely used in various fields, including the photovoltaic industry, battery manufacturing, automotive manufacturing, etc. In the photovoltaic industry, the welding process is often used to weld the bus bar connected to the solar cell to the conductive part of the junction box, so as to collect the current through the junction box and output it outward.

[0003] The traditional welding method is generally to first attach the solder to the conductive part of the junction box, and heat the solder to melt it to connect the bus bar to the conductive part of the junction box. Since the solder has fluidity, at the relatively high temperature during the welding process, the solder is likely to flow on the conductive part of the junction box, resulting in solder loss, and it is also likely to cause the phenomenon of false soldering, affecting the welding effect. Utility Model Content

[0004] The present application provides a junction box and a photovoltaic module to solve the technical problems that the welding method of the existing junction box is likely to cause solder loss and is also likely to cause the phenomenon of false soldering, affecting the welding effect.

[0005] According to one aspect of the present application, a junction box is provided, including: a bypass module; a conductive member disposed on both sides of the bypass module; and a welding portion disposed in the conductive member, the welding portion having a solder receiving cavity; a bus bar through hole is provided at the bottom of the solder receiving cavity to enable a bus bar to pass through the bus bar through hole and be welded to the conductive member in the solder receiving cavity by solder. The junction box of the present application can use the solder receiving cavity to receive the solder during welding by providing the welding portion with the solder receiving cavity, which can not only avoid solder loss caused by the flow of solder on the surface of the conductive member, but also ensure that the bus bar is firmly welded to the conductive member by the solder in the solder receiving cavity after passing through the bus bar through hole, so as to avoid the phenomenon of false soldering and improve the welding effect.

[0006] In a further preferred solution, the welding portion includes a side wall and a bottom sealing member, and the bottom sealing member and the side wall together enclose the solder receiving cavity; the bottom sealing member is formed with the bus bar through hole. In this solution, the solder receiving cavity is enclosed by the side wall and the bottom sealing member, and the bottom sealing member is located at the bottom of the solder receiving cavity, which can prevent the solder from leaking out of the solder receiving cavity through the bottom sealing member.

[0007] In a further preferred solution, the bottom sealing member and the side wall are integrally formed, and the bottom sealing member is movably disposed inside the side wall; at this time, the bottom sealing member exists in a movable form, so the bottom sealing member can be independently manufactured and formed, which is more flexible and convenient to use in the actual production process.

[0008] Alternatively, in some other preferred embodiments, the bottom seal is integrally formed with the sidewall. At this time, the connection between the bottom seal and the sidewall is relatively firm, so that the structural strength of the welding part is relatively high, which is beneficial to the welding operation.

[0009] In a further preferred embodiment, the bottom seal further includes an elastic seal disposed on both sides of the perforation of the bus bar. When the bus bar passes through the perforation of the bus bar and extends into the solder receiving cavity, the elastic seal disposed on both sides of the perforation of the bus bar squeezes the bus bar, so that the elastic seal fits against the outer wall of the bus bar, thereby preventing the solder from leaking from the perforation of the bus bar.

[0010] In a further preferred embodiment, the elastic seal includes a first elastic portion and a second elastic portion. The first elastic portion and the second elastic portion are connected to the bottom seal and are respectively located on both sides of the perforation of the bus bar. The first elastic portion and the second elastic portion both incline towards the perforation of the bus bar. In this solution, the first elastic portion and the second elastic portion are oppositely disposed on both sides of the perforation of the bus bar and incline towards the perforation of the bus bar. Then, when the bus bar passes through the perforation of the bus bar, the first elastic portion and the second elastic portion can respectively form a clamp from the opposite sides of the bus bar and closely fit against the surface of the bus bar, thereby sealing between the outer wall of the bus bar and the inner wall of the perforation of the bus bar, effectively avoiding the leakage of solder from the perforation of the bus bar, and the performance is reliable.

[0011] In a further preferred embodiment, the bottom seal is further provided with a guiding hole, one end of which communicates with the perforation of the bus bar; the other end of the guiding hole away from the perforation of the bus bar has a larger opening size. The guiding hole can guide the direction of the bus bar passing through the perforation of the bus bar, so as to improve the operation efficiency.

[0012] In a further preferred embodiment, the welding part further includes an opening section and a connecting section, the opening section and the connecting section are disposed at the top of the solder receiving cavity, the opening size of the opening section is larger than the opening size of the top of the solder receiving cavity, and the connecting section connects the opening section and the top of the solder receiving cavity to form a stepped structure. In this solution, the bus bar can contact the stepped structure formed by the opening section and the connecting section, so as to increase the contact area between the bus bar and the conductive part, thereby being beneficial to improving the welding stability between the bus bar and the conductive part.

[0013] According to another aspect of the present application, a photovoltaic module is provided, including: the junction box according to any one of the above; and a bus bar, one end of the bus bar is used for electrically connecting a battery cell, and the other end passes through the perforation of the bus bar and is connected to the conductive part through solder. Since the photovoltaic module of the present application adopts the above-mentioned junction box, based on the structural design of the junction box itself, solder loss can be avoided, the welding stability between the bus bar and the junction box can be improved, and the current collection effect can be improved.

[0014] In a further preferred solution, the other end of the bus bar includes an insertion section and a main body section. The insertion section is connected to the main body section and penetrates into the solder receiving cavity. The insertion section of this solution can be set in a relatively sharp structural form to facilitate passing through the perforation of the bus bar by the insertion section, so as to be welded to the conductive part through the solder.

[0015] In a further preferred solution, the surface of the insertion section is provided with barbs extending obliquely in a direction opposite to the insertion direction of the insertion section. By providing the barb structure, it helps the bus bar to quickly pass through the perforation of the bus bar, and can increase the contact area between the bus bar and the solder, making the welding more stable.

[0016] In summary, the junction box and the photovoltaic module provided by this application have at least the following beneficial effects: The photovoltaic module provided by this application includes a junction box and a bus bar. The junction box includes a welding part with a solder receiving cavity. During welding, the solder receiving cavity can be used to receive the solder, thereby preventing the solder from flowing randomly on the surface of the conductive part and causing solder loss. Moreover, since the solder is restricted within the solder receiving cavity, it can ensure that after the bus bar passes through the perforation of the bus bar, it is firmly welded to the conductive part through the solder in the solder receiving cavity, so as to avoid the phenomenon of false soldering and improve the welding and bus bar connection effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the photovoltaic module and the junction box provided by the embodiment of the present application;

[0019] Figure 2 It is a schematic top view structure of the photovoltaic module and the junction box provided by the embodiment of the present application;

[0020] Figure 3 It is a schematic side view structure of the photovoltaic module and the junction box provided by the embodiment of the present application when cooperating with a solder dripping gun head;

[0021] Figures 4 - 8 It is a schematic diagram of the structure of the solder receiving cavity of the junction box provided by the embodiment of the present application;

[0022] Figure 9 It is a schematic diagram of the partial structure of the photovoltaic module and the junction box provided by the embodiment of the present application;

[0023] Figure 10 is Figure 9 a partial top view structural diagram in

[0024] Figure 11 is Figure 10 a structural diagram of the bottom seal member in

[0025] Figure 12 is a partial structural diagram of a photovoltaic module and a junction box provided by another embodiment of the present application;

[0026] Figure 13 is Figure 12 an internal structural diagram of the photovoltaic module and the junction box in

[0027] Figure 14 is Figure 12 a sectional view diagram of the photovoltaic module and the junction box in

[0028] Figure 15 is Figure 14 a partial enlarged structural diagram in

[0029] Figure 16 is a structural diagram of a bus bar provided by an embodiment of the present application.

[0030] The reference numerals are as follows:

[0031] 1, photovoltaic module;

[0032] 10, junction box; 100, conductive member; 200, bypass module; 300, welding part; 310, side wall; 320, bottom seal member; 321, bus bar through hole; 322, guiding hole; 330, elastic seal member; 331, first elastic part; 332, second elastic part; 340, solder receiving cavity; 350, opening section; 360, connecting section; 400, housing; 500, joint;

[0033] 20, bus bar; 21, insertion section; 22, main body section; 23, barb structure;

[0034] 2, solder dropping gun head. Detailed implementation manners

[0035] In the description of the present application, it should be understood that when terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are used to indicate the orientation or positional relationship, without special explanation, it is understood to be based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0036] In addition, features limited by "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Features limited by "first" and "second" may explicitly or implicitly include at least one of the limited features. When the description "a plurality of" appears, it generally means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0037] In the present application, unless otherwise clearly specified and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection, it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0038] In the description of this specification, when terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0039] Figure 1 It is a schematic diagram of the overall structure of the photovoltaic module and the junction box provided by the embodiment of the present application; Figure 2 It is a schematic top view structure diagram of the photovoltaic module and the junction box provided by the embodiment of the present application; Figure 3Schematic side view structure diagram of the photovoltaic module provided by the embodiment of the present application when cooperating with the junction box and the solder dripping gun head.

[0040] Please refer to Figures 1 - 3 , the junction box 10 provided by the embodiment of the present application includes a bypass module 200, a conductive member 100, and a welding portion 300. The junction box 10 is used to be electrically connected to the solar cell through the bus bar 20, so as to collect the current generated by the solar cell and output it outward.

[0041] Specifically, the bus bar 20 is mainly used to collect current. Exemplarily, the bus bar 20 can be connected to different solar cells to achieve the function of collecting current to the conductive member 100. The material of the bus bar 20 is a metal with excellent conductivity, such as alloy strip made of pure copper, brass, aluminum alloy, and tin-lead alloy coated on the surface. One end of the bus bar 20 is used to be electrically connected to the solar cell, and the other end is welded and electrically conducted with the conductive member 100 through solder. Exemplarily, the bus bar 20 can be a bus bar electrically connected to the solar cell.

[0042] The bypass module 200 is electrically connected to the conductive member 100 and is used to prevent the current from flowing backward to protect the circuit. Exemplarily, the bypass module 200 can be a bypass diode. The function of the bypass diode is a diode reversely connected in parallel at both ends of the solar cell, which can effectively prevent the solar cell from being burned out due to the hot spot effect and prevent some of the solar cells from becoming loads and generating serious heat damage due to occlusion under strong light.

[0043] The conductive member 100 is disposed on both sides of the bypass module 200. The conductive member 100 is made of a conductive material to provide good conductivity. Exemplarily, the conductive member 100 can adopt a metal material, specifically, it can be made of gold, copper, silver, etc. The conductive member 100 is used to electrically connect the power transmission cable and the bus bar 20, so that the current collected by the bus bar 20 to the conductive member 100 can be output outward through the power transmission cable for use.

[0044] The welding portion 300 is disposed in the conductive member 100. The welding portion 300 has a solder receiving cavity 340. A bus bar through hole 321 is provided at the bottom of the solder receiving cavity 340 to enable the bus bar 20 to pass through the bus bar through hole 321 and be welded to the conductive member 100 in the solder receiving cavity 340 through solder. Specifically, the solder receiving cavity 340 is used to receive solder. For example, the solder can be selected as tin, copper, etc. Exemplarily, when the solder is selected as tin, the welding operation can be realized by using the solder dripping gun head 2 for hot melting tin casting welding method. In the following embodiments, tin welding is taken as an example. It should be understood that only the case of setting two welding portions 300 is shown in the figure. In other embodiments, three, four or more welding portions 300 can also be set.

[0045] With the above structural design, when welding the bus bar 20 to the conductive member 100 of the junction box 10, the bus bar 20 can be passed through the bus bar perforation 321 so that the bus bar 20 extends into the solder receiving cavity 340 and welding operations are performed within the solder receiving cavity 340. Since the welding portion 300 having the solder receiving cavity 340 is provided, the solder receiving cavity 340 can be utilized to receive solder during welding, thereby preventing solder from flowing randomly on the surface of the conductive member 100 and causing solder loss. Moreover, by providing the solder receiving cavity 340, the area where the solder is located can be restricted, which can not only accurately position the welding location but also ensure that after the bus bar 20 passes through the bus bar perforation 321, it is firmly welded to the conductive member 100 through the solder in the solder receiving cavity 340, so as to avoid the phenomenon of false soldering and improve the welding and bus bar connection effects.

[0046] As a further preferred embodiment, on the basis of the above solution, in the specific embodiments of the present application, one or more of the following additions or combinations may also be included.

[0047] In some alternative embodiments, the junction box 10 further includes a housing 400, and the conductive member 100 and the welding portion 300 are disposed within the housing 400.

[0048] In some alternative embodiments, a connector 500 is provided at the end of at least one conductive member 100, and the conductive member 100 is externally connected to a power transmission cable through the connector 500. Exemplarily, the connector 500 may be a U-shaped cable clip integrated with the conductive member 100.

[0049] Since the molten tin will flow into the solder receiving cavity 340 during the welding process of the bus bar 20 and the conductive member 100, when the amount of tin used is large, in order to prevent the molten tin from directly flowing out from the bottom of the solder receiving cavity 340, the solder receiving cavity 340 can also be blocked.

[0050] In some alternative embodiments, the welding portion 300 includes a side wall 310 and a bottom seal 320, and the bottom seal 320 and the side wall 310 together enclose the solder receiving cavity 340; the bottom seal 320 is formed with a bus bar perforation 321. Specifically, the bottom seal 320 is located at the bottom of the solder receiving cavity 340, and the bottom seal 320 can prevent solder from leaking out of the solder receiving cavity 340. Thus, passing the bus bar 20 through the bottom seal 320 via the bus bar perforation 321 enables the bus bar 20 to be smoothly welded to the conductive member 100, and at the same time, blocking the bottom of the solder receiving cavity 340 by the bottom seal 320 can prevent the molten tin from flowing out through the gap between the solder receiving cavity 340 and the bus bar 20.

[0051] Figures 4 - 8 It is a schematic structural diagram of the solder receiving cavity 340 of the junction box 10 provided in the embodiment of the present application.

[0052] In some alternative embodiments, the solder receiving cavity 340 has a conical, inverted conical or cylindrical structure.

[0053] Referring to Figure 4 , the solder receiving cavity 340 has a conical structure, that is, the solder receiving cavity 340 is gradually expanded along the direction in which the bus bar 20 is inserted into the solder receiving cavity 340. At this time, it is beneficial to receive the molten tin through the solder receiving cavity 340, and the amount of molten tin used can be saved. Referring again to Figure 5 , a bottom sealing member 320 is provided at the bottom of the solder receiving cavity 340. Exemplarily, the bottom sealing member 320 can be a plastic film with a certain deformation ability to seal the bottom of the solder receiving cavity 340, thereby preventing the molten tin from leaking.

[0054] Referring to Figure 6 , the solder receiving cavity 340 has an inverted conical structure, that is, the solder receiving cavity 340 is gradually tapered along the direction in which the bus bar 20 is inserted into the solder receiving cavity 340. At this time, it is convenient for the bus bar 20 to pass through the bottom sealing member 320 and extend into the solder receiving cavity 340. Referring again to Figure 7 , a bottom sealing member 320 is provided at the bottom of the solder receiving cavity 340. Exemplarily, the bottom sealing member 320 can be a plastic film with a certain deformation ability to seal the bottom of the solder receiving cavity 340.

[0055] Referring to Figure 8 , the solder receiving cavity 340 has a cylindrical structure. At this time, solder can also be received through the solder receiving cavity 340.

[0056] It should be understood that the solder receiving cavity 340 is not limited to the above structural forms. Without departing from the technical concept of the present application, other forms of the solder receiving cavity 340 are within the protection scope of the present application.

[0057] In some alternative embodiments, the bottom sealing member 320 and the side wall 310 are integrally formed, and the bottom sealing member 320 is movably disposed inside the side wall 310; at this time, the bottom sealing member 320 exists in a movable form, so the bottom sealing member 320 can be independently manufactured and formed, which is more flexible and convenient in actual production.

[0058] Figure 9 FIG. is a partial structural schematic diagram of the photovoltaic module 1 and the junction box 10 provided by the embodiments of the present application; Figure 10 is Figure 9 a partial top view structural schematic diagram in Figure 11 is Figure 10 a structural schematic diagram of the bottom sealing member 320 in

[0059] Referring to Figures 9 - 11, in some alternative embodiments, the bottom of the solder receiving cavity 340 is hollowed out; the bottom sealing member 320 is movably disposed within the solder receiving cavity 340 and is used to seal the bottom of the solder receiving cavity 340. Specifically, the bottom sealing member 320 may be in a bowl shape, and a busbar through hole 321 is provided through the bottom of the bottom sealing member 320. When the busbar 20 passes through the busbar through hole 321, the busbar 20 is sleeved on the outer periphery of the busbar 20. The opening size of the top of the bottom sealing member 320 is greater than or equal to the opening size of the bottom of the solder receiving cavity 340, so that after the bottom sealing member 320 is placed in the solder receiving cavity 340, it can be stuck in the solder receiving cavity 340 to prevent the bottom sealing member 320 from detaching from the bottom of the solder receiving cavity 340. The opening size of the bottom of the solder receiving cavity 340 is the opening size of the bottom of the side wall 310. Thus, by using the bottom sealing member 320 in this embodiment to seal the solder receiving cavity 340, the performance is reliable, the device is simple, and the cost is low. Moreover, since the bottom sealing member 320 exists in a movable form, the bottom sealing member 320 can be manufactured separately, making it more flexible to use in the actual production process.

[0060] Optionally, the material of the bottom sealing member 320 may be the same as or different from the materials of the conductive member 100 and the busbar 20. For example, the bottom sealing member 320 may be made of metal, paper, silicone, rubber, or other materials.

[0061] It should be understood that, except for the illustrated case, in other alternative embodiments, the shape of the bottom sealing member 320 may also be a flat circle, a square, etc.

[0062] Figure 12 Partial structural schematic diagrams of the photovoltaic module 1 and the junction box 10 provided by another embodiment of the present application; Figure 13 is Figure 12 Internal structural schematic diagrams of the photovoltaic module 1 and the junction box 10 in Figure 14 is Figure 12 Cross-sectional schematic diagrams of the photovoltaic module 1 and the junction box 10 in Figure 15 is Figure 14 Partial enlarged structural schematic diagrams in

[0063] Referring to Figures 12 - 15 , in some other alternative embodiments, the bottom sealing member 320 and the side wall 310 are integrally formed. Specifically, the top of the side wall 310 is connected to the conductive member 100, the bottom sealing member 320 has a substantially flat plate-like structure, and the bottom sealing member 320 and the side wall 310 are integrally designed. Thus, the side wall 310 forms the side wall of the solder receiving cavity 340, and the bottom sealing member 320 forms the bottom of the solder receiving cavity 340. Compared with the method of movably disposing the bottom sealing member 320 within the solder receiving cavity 340, the integrated design can reduce redundant components and facilitate operation. Moreover, at this time, the connection between the bottom sealing member 320 and the side wall 310 is relatively stable, making the structural strength of the welding portion 300 relatively high, which is beneficial for welding operations.

[0064] In some alternative embodiments, the bottom seal 320 further includes an elastic seal 330 disposed on both sides of the busbar perforation 321. The elastic seal 330 has a certain elastic deformation ability and is used to seal the gap between the busbar 20 and the busbar perforation 321. Specifically, when the busbar 20 passes through the busbar perforation 321 and extends into the solder receiving cavity 340, the elastic seal 330 disposed on both sides of the busbar perforation 321 squeezes the busbar 20, so that the elastic seal 330 fits against the outer wall of the busbar 20, thereby preventing solder from leaking between the busbar perforation 321 and the busbar 20.

[0065] Furthermore, in some alternative embodiments, the elastic seal 330 includes a first elastic portion 331 and a second elastic portion 332. The first elastic portion 331 and the second elastic portion 332 are connected to the bottom seal 320 and are respectively located on both sides of the busbar perforation 321. Both the first elastic portion 331 and the second elastic portion 332 are inclined toward the busbar perforation 321. In this embodiment, the first elastic portion 331 and the second elastic portion 332 are oppositely disposed on both sides of the busbar perforation 321 and are inclined toward the busbar perforation 321. Then, when the busbar 20 passes through the busbar perforation 321, the first elastic portion 331 and the second elastic portion 332 can respectively clamp from opposite sides of the busbar 20 and fit tightly against the surface of the busbar 20, thereby sealing between the outer wall of the busbar 20 and the inner wall of the busbar perforation 321, effectively avoiding solder leakage from the busbar perforation 321, and having reliable performance.

[0066] Referring to Figures 12 - 15 , by way of example, the first elastic portion 331 and the second elastic portion 332 are arranged to clamp the busbar 20 after the busbar 20 passes out of the busbar perforation 321. Specifically, two arc-shaped first elastic portions 331 and second elastic portions 332 are oppositely disposed at the center of the bottom of the bottom seal 320. One end of the first elastic portion 331 is connected to the edge of the busbar perforation 321, and the other end of the first elastic portion 331 converges toward the center line of the busbar perforation 321, so that the first elastic portion 331 is inclined toward the busbar perforation 321. The second elastic portion 332 is symmetrically arranged with the first elastic portion 331. The first elastic portion 331 and the second elastic portion 332 can be made of plastic material, and are elastically pressed against each other, and are respectively located on both sides of the busbar perforation 321. When the busbar 20 passes through the busbar perforation 321, the first elastic portion 331 and the second elastic portion 332 clamp from opposite sides of the busbar 20 and fit tightly against the outer surface of the busbar 20, thereby effectively avoiding solder leakage from the gap between the busbar perforation 321 and the busbar 20, having low anti-leakage cost and higher welding efficiency.

[0067] In some alternative embodiments, the bottom seal 320 is further provided with a guiding hole 322, one end of the guiding hole 322 communicates with the bus bar through hole 321; the other end of the guiding hole 322 away from the bus bar through hole 321 has a larger opening size. The guiding hole 322 can guide the direction of the bus bar 20 passing through the bus bar through hole 321, so as to improve the operation efficiency.

[0068] Exemplarily, referring to Figure 15 , on the side of the bottom seal 320 away from the conductive member 100, there is a guiding hole 322, and the guiding hole 322 has a conical structure. The opening size, i.e., the diameter, of the top end of the guiding hole 322 is smaller and communicates with the bus bar through hole 321; the opening size, i.e., the diameter, of the bottom end of the guiding hole 322 is larger, so that the direction of the bus bar 20 inserted into the bus bar through hole 321 can be guided and positioned, so as to improve the welding operation efficiency.

[0069] In some alternative embodiments, the welding portion 300 further includes an opening section 350 and a connecting section 360. The opening section 350 and the connecting section 360 are disposed at the top of the solder receiving cavity 340. The opening size of the opening section 350 is larger than the opening size of the top of the solder receiving cavity 340. The connecting section 360 connects the opening section 350 and the top of the solder receiving cavity 340 to form a stepped structure. In this embodiment, the bus bar 20 can contact the stepped structure formed by the opening section 350 and the connecting section 360, so as to increase the contact area between the bus bar 20 and the conductive member 100, thereby being beneficial to improving the welding stability between the bus bar 20 and the conductive member 100.

[0070] Referring again to Figure 15 , exemplarily, the opening section 350 is annularly sleeved outside the top edge of the solder receiving cavity 340, and the connecting section 360 is annularly sleeved between the opening section 350 and the top of the solder receiving cavity 340. The diameter of the opening section 350 is larger than the diameter of the connecting section 360, and the opening section 350 and the connecting section 360 are connected to form a stepped structure. Specifically, holes are formed in the conductive member 100 to form the opening section 350 and the connecting section 360, and the opening section 350 and the connecting section 360 together enclose a frustum-shaped stepped structure. Thus, when the bus bar 20 is inserted into the solder receiving cavity 340, the bus bar 20 can be bent onto the frustum-shaped stepped structure, so that the bus bar 20 contacts both the opening section 350 and the connecting section 360 at the same time, so as to increase the contact area between the bus bar 20 and the conductive member 100, thereby being beneficial to improving the welding effect.

[0071] According to another embodiment of the present application, a photovoltaic module 1 is provided, which includes the junction box 10 of any of the above embodiments and a bus bar 20. One end of the bus bar 20 is used for electrically connecting to the solar cells, and the other end passes through the bus bar perforation 321 and is connected to the conductive member 100 through solder. Since the photovoltaic module 1 of the embodiment of the present application adopts the above-mentioned junction box 10, based on the structural design of the junction box 10 itself, when the bus bar 20 is welded to the conductive member 100 of the junction box 10, the solder can be restricted by the solder receiving cavity 340, avoiding the loss caused by the flow of the solder on the conductive member 100, and the welding position can be accurately positioned through the solder receiving cavity 340, which can effectively solve the problem of false soldering and is beneficial to improving the current collection effect.

[0072] Figure 16 FIG. is a schematic structural view of the bus bar 20 provided by the embodiment of the present application.

[0073] Referring to Figure 16 , in some alternative embodiments, the other end of the bus bar 20 includes an insertion section 21 and a main body section 22. The other end is the end of the bus bar 20 for passing through the bus bar perforation 321. The insertion section 21 is connected to the main body section 22 and penetrates into the solder receiving cavity 340. Specifically, when welding the bus bar 20, the insertion section 21 is used to penetrate into the solder receiving cavity 340 through the bus bar perforation 321. In this embodiment, the insertion section 21 can be set to a relatively sharp structural form, so as to facilitate the use of the insertion section 21 to pass through the bus bar perforation 321, and then be welded to the conductive member 100 through solder.

[0074] In some alternative embodiments, the surface of the insertion section 21 is provided with barbs 23 extending obliquely in a direction opposite to the insertion direction of the insertion section 21. By providing the barbs 23, it is easier for the insertion section 21 to pass through the bus bar perforation 321, which helps the bus bar 20 to quickly extend into the solder receiving cavity 340 through the bus bar perforation 321, thereby improving the welding efficiency. Moreover, the barbs 23 can increase the contact area between the bus bar 20 and the solder, making the welding more stable and avoiding the occurrence of false soldering.

[0075] Referring to Figure 16 , in some alternative embodiments, the barbs 23 are composed of a plurality of barbs, and the specific number of barbs is not limited. Exemplarily, the length of the barbs can be 5-20 mm.

[0076] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A junction box (10), characterized in that: include: Bypass module (200); Conductive members (100) are arranged on both sides of the bypass module (200); as well as A welding portion (300) is disposed in the conductive member (100), and the welding portion (300) has a solder receiving cavity (340); The bottom of the solder receiving cavity (340) is provided with a busbar through-hole (321), so that the busbar (20) passes through the busbar through-hole (321) and is soldered with the conductive member (100) in the solder receiving cavity (340) through solder.

2. The junction box (10) according to claim 1, characterized in that: The welding part (300) comprises: Side panel (310); A bottom seal (320) which, together with the side enclosure (310), encloses the solder receiving cavity (340); The bottom seal (320) is formed with the current collecting member through hole (321).

3. The junction box (10) according to claim 2, characterized in that: The bottom seal (320) and the side enclosure (310) are formed separately, and the bottom seal (320) is movably arranged inside the side enclosure (310); or the bottom seal (320) and the side enclosure (310) are formed integrally.

4. The junction box (10) according to claim 2 or 3, characterized in that: The bottom seal (320) further comprises an elastic seal (330) which is arranged on both sides of the current collecting piece through hole (321).

5. The junction box (10) according to claim 4, characterized in that: The elastic sealing member (330) comprises a first elastic portion (331) and a second elastic portion (332), wherein the first elastic portion (331) and the second elastic portion (332) are connected to the bottom sealing member (320) and are respectively located on both sides of the collector through hole (321), and the first elastic portion (331) and the second elastic portion (332) are both inclined toward the collector through hole (321).

6. The junction box (10) according to claim 2 or 3, characterized in that: The bottom seal (320) is also provided with a guide hole (322), one end of which is connected to the collector through hole (321); the other end of the guide hole (322) away from the collector through hole (321) has a larger opening size.

7. The junction box (10) according to any one of claims 1 to 3 and 5, characterized in that: The welding portion (300) further comprises an opening section (350) and a connecting section (360), wherein the opening section (350) and the connecting section (360) are arranged at the top of the solder receiving cavity (340), the opening size of the opening section (350) is larger than the opening size of the top of the solder receiving cavity (340), and the connecting section (360) connects the opening section (350) and the top of the solder receiving cavity (340) to form a stepped structure.

8. A photovoltaic module (1), characterized in that: include: The junction box (10) according to any one of claims 1 to 7; as well as A busbar (20), one end of the busbar (20) being used for electrically connecting to a battery cell, and the other end of the busbar passing through a through hole (321) of the busbar and connected to the conductive member (100) via solder.

9. The photovoltaic module (1) according to claim 8, characterized in that: The other end of the busbar (20) comprises an insertion section (21) and a main section (22); the insertion section (21) is connected to the main section (22) and penetrates into the solder receiving cavity (340).

10. The photovoltaic module (1) according to claim 9, characterized in that: The surface of the insertion section (21) is provided with a barb structure (23) extending obliquely in a direction opposite to the insertion direction of the insertion section (21).

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