Photovoltaic junction box

Abstract

The utility model relates to a photovoltaic junction box, which comprises a junction shell, a junction end cover, a diode and a lug plate connected with a pin of the diode, and is characterized in that the lug plate comprises a heat-conducting sheet and a bending part connected with the heat-conducting sheet and used for connecting the pin of the diode; an arrangement groove for clamping and arranging pins of the diode is formed between the bending part and the heat-conducting sheet, and the arrangement groove is provided with a binding surface; when the pin of the diode is arranged in the arrangement groove, the binding face is attached to the outer side wall of the pin of the diode. According to the invention, the problem of heat accumulation at the joint of the lug plate and the pin of the diode caused by large resistance due to small contact surface when the lug plate and the pin of the diode are connected through welding is solved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic accessory technology, and in particular to a photovoltaic junction box. Background Technology

[0002] With the widespread application of photovoltaic power generation, photovoltaic junction boxes, as one of the important accessories of photovoltaic modules, play a role in connecting photovoltaic panels to external circuits. A photovoltaic junction box is installed on a photovoltaic panel and includes a junction housing, a terminal cover, and a diode installed inside the junction housing. In existing technology, terminals are typically provided on the pins on both sides of the diode, and then the pins on both sides of the diode are connected to the terminals by soldering. One side of the terminals is connected to the photovoltaic panel via a busbar, and the other side is connected to the external circuit via a cable.

[0003] Regarding the aforementioned technologies, the inventors believe that when the terminal block is directly connected to the pins on both sides of the diode by welding, the contact area between the diode pins and the terminal block is small, resulting in a large resistance. This makes it easy for heat to accumulate at the connection point between the terminal block and the diode pins when the current is large, thus affecting the overall performance of the photovoltaic junction box. Utility Model Content

[0004] To address the issue of heat buildup at the connection point between the terminal block and the diode pins due to the small contact area and high resistance caused by soldering, this application provides a photovoltaic junction box.

[0005] The photovoltaic junction box provided in this application adopts the following technical solution:

[0006] A photovoltaic junction box includes a junction housing, a junction end cover, a diode, and a junction piece for connecting the pins of the diode. The junction piece includes a heat-conducting sheet and a bent portion for connecting the heat-conducting sheet and the pins of the diode. An arrangement groove for snapping the pins of the diode is formed between the bent portion and the heat-conducting sheet. The arrangement groove has a mating surface. When the pins of the diode are arranged in the arrangement groove, the mating surface is mated to the outer wall of the pins of the diode.

[0007] By adopting the above technical solution, when installing the connector, the diode pin is inserted into the slot from the opening of the slot. The diode pin can fit against the inner wall of the slot, which increases the contact area between the diode pin and the bent part. This results in a smaller resistance between the diode and the pin, so that when a large current passes through the diode pin, less heat is generated between it and the connector, and heat can be dissipated through the heat-conducting plate.

[0008] Optionally, the bent portion is provided with an extension at the opening of the arrangement groove for abutting the pin of the diode into the arrangement groove.

[0009] By adopting the above technical solution, when the diode pins are arranged in the arrangement slot, the extension can hold the diode pins in the arrangement slot, which helps to improve the stability of the diode pins when connected to the terminal block.

[0010] Optionally, the extension is provided with an inclined guide surface.

[0011] By adopting the above technical solution, the setting of the guide surface can reduce the probability of interference between the diode pins and the extension when the diode pins are slid into the arrangement slot.

[0012] Optionally, the inner bottom surface of the wiring housing is provided with a support column for supporting the heat-conducting plate, and the heat-conducting plate is provided with a positioning hole for cooperating with the support column.

[0013] By adopting the above technical solution, the setting of the support column and positioning hole allows the wiring piece to maintain a certain distance from the bottom surface of the arrangement chamber when it is installed, which helps to improve the heat dissipation effect of the wiring piece.

[0014] Optionally, the bottom of the wiring housing is provided with a busbar groove that runs through the upper and lower surfaces, and on both sides of the busbar groove are provided support side plates for supporting the end of the heat-conducting sheet facing the diode. The two support side plates are provided with abutment surfaces on the side facing each other for the busbar strip connected to the heat-conducting sheet to abut against.

[0015] By adopting the above technical solution, the support side plate can further improve the support for the connecting piece. The abutment surface allows the busbar connecting the heat-conducting plate to rest against the abutment surface, reducing the probability of the busbar being damaged due to heat generation from the heat-conducting plate.

[0016] Optionally, the wiring housing has a through groove for the cable connecting the wiring piece to pass through, and a wiring plate is provided at the bottom of the through groove for covering the through groove; the wiring plate has a stepped portion extending toward the wiring piece, and the wiring housing is provided at the through groove for cooperating with the stepped portion.

[0017] By adopting the above technical solution, the wiring board and the stepped part can extend the length of the cable connecting the wiring piece inside the wiring housing, thereby increasing the creepage distance between the cable connecting the wiring piece and the wiring piece, which helps to improve safety.

[0018] Optionally, the outer surface of the wiring housing is provided with a recessed portion corresponding to the stepped groove.

[0019] By adopting the above technical solution, the wiring housing is formed by injection molding. The injection molded product will shrink when cooled. The recessed part and the stepped groove are arranged accordingly, so that the wall thickness difference of the wiring housing in the area where the recessed part is located is small, thereby making the difference in the degree of shrinkage small, which helps to reduce the shrinkage of the stepped groove to facilitate the installation of the wiring board.

[0020] Optionally, an extending protrusion is provided on the bottom side of one side of the wiring housing along the length direction.

[0021] By adopting the above technical solution, the extended protrusion can increase the width of the bottom of the wiring housing, thereby increasing the creepage distance of the bottom of the wiring housing in the width direction, which helps to improve safety.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. A photovoltaic junction box, wherein the diode pins are arranged in an arrangement groove formed between a bent portion and a heat-conducting plate, the mating surface of the arrangement groove can be mated with the outer wall of the diode pins, so that the contact area between the diode pins and the junction plate is large, resulting in low resistance, and when a large current passes through the diode, less heat is generated between the diode pins and the junction plate.

[0024] 2. By providing an extension at the bend, the extension can abut the diode pins within the arrangement groove, which helps improve the stability of the connection between the diode pins and the terminal block;

[0025] 3. By setting support columns on the wiring housing, a certain distance is maintained between the heat-conducting plate and the bottom surface of the wiring housing, which helps the heat-conducting plate dissipate heat. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the structure of the diode and the terminal block in an embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the wiring housing in an embodiment of this application.

[0030] Figure 5 This is a schematic diagram of the structure in which the diode and the terminal block are mounted on the terminal housing in an embodiment of this application.

[0031] Figure 6 This is a schematic diagram of the through-line groove in the embodiment of this application.

[0032] Figure 7 This is a schematic diagram of the terminal cover structure in an embodiment of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. Wiring housing; 11. Housing body; 111. Arrangement chamber; 112. Support column; 1121. Support base; 1122. Positioning column; 113. Combustion groove; 114. Support side plate; 1141. Abutment surface; 115. Extending protrusion; 116. Snap-fit ​​protrusion; 12. Wiring part; 121. Through groove; 122. Stepped groove; 123. Recessed part; 13. Wiring plate; 131. Stepped part; 2. Wiring end cap; 21. Snap-fit ​​groove; 3. Diode; 4. Wiring piece; 41. Heat-conducting plate; 42. Bending part; 421. Extension part; 4211. Guide surface; 43. Arrangement groove; 431. Contact surface. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0035] This application discloses a photovoltaic junction box.

[0036] Reference Figure 1 and Figure 2 The photovoltaic junction box includes a junction housing 1, a terminal cover 2 covering the junction housing 1, a diode 3 installed inside the junction housing 1, and terminals 4 connecting the pins of the diode 3. There are two terminals 4, each connecting to a pin on one side of the diode 3.

[0037] Reference Figure 2 and Figure 3 The connector 4 includes a heat-conducting sheet 41 and a bent portion 42 connecting the heat-conducting sheet 41. In this embodiment, the connector 4 is a copper sheet, and the bent portion 42 is formed by bending.

[0038] Reference Figure 2 and Figure 3An arrangement groove 43 for mounting the diode 3 pins is formed between the heat-conducting sheet 41 and the bending portion 42, and a contact surface 431 is formed in the bending area of ​​the arrangement groove 43. An extension 421 is also provided at the opening of the arrangement groove 43 in the bending portion 42. The end of the extension 421 has an inclined guide surface 4211. When mounting the diode 3 and the connector 4, the diode pins are inserted from the opening of the arrangement groove 43 toward the inside of the groove 43, so that the contact surface 431 is in contact with the outer wall of the diode 3 pins. The bending portion 42 located at the top of the diode pins is welded using a resistance welding process, fixing the diode 3 pins to the bending portion 42. Due to the high temperature in the welding area, the welding area melts, and the extension 421 hangs downwards under gravity. After the welding area cools, the extension 421 can abut the diode 3 pins within the arrangement groove 43.

[0039] Reference Figure 2 and Figure 4 The housing 1 is injection molded and includes a housing body 11 and a wiring portion 12 connecting the housing body 11. The housing body 11 has an opening at the top for arranging the diode 3 and the wiring piece 4. The housing body 11 has support posts 112 for supporting the wiring piece 4 at the four corners of the arrangement chamber 111. The support posts 112, from bottom to top, include a support base 1121 connected to the bottom surface of the housing body 11 and a positioning post 1122 disposed on the support base 1121.

[0040] Reference Figure 2 and Figure 4 The main body 11 of the housing has a confluence channel 113 extending through the upper and lower surfaces in the middle area of ​​the bottom surface of the cavity 111. Support side plates 114 extending upwards are provided on both sides of the confluence channel 113, with the top surface of the support side plates 114 flush with the top surface of the support base 1121. Each of the two support side plates 114 has an abutment surface 1141 on the side facing towards each other.

[0041] Reference Figure 4 and Figure 5When the diode 3 and the connecting piece 4 are installed in the arrangement chamber 111, one end of the heat-conducting plate 41 is mounted on the support post 112 and the other end abuts against the top surface of the support side plate 114. The heat-conducting plate 41 has positioning holes corresponding to two positioning posts 1122 located on the same side. The positioning posts 1122 pass through the positioning holes, and the heat-conducting plate 41 abuts against the top surface of the support base 1121 at the edge of the positioning holes. The distance from the top of the abutment surface 1141 to the diode 3 is less than the distance from the heat-conducting plate 41 to the diode 3 on the side facing the diode. This allows the busbar connecting the photovoltaic panel to abut against the abutment surface 1141 of the support side plate 114 when it passes through the busbar groove 113 and connects to the top of the heat-conducting plate 41. This reduces the probability of the busbar contacting the side of the heat-conducting plate 41 and being damaged when the heat-conducting plate 41 is at a high temperature.

[0042] Reference Figure 5 and 6 The bottom of the wiring portion 12 is provided with a through groove 121 that communicates with the arrangement chamber 111 and allows the cable connecting the connector 4 to pass through. A wiring plate 13 is installed at the bottom of the arrangement groove 43 to cover the bottom of the through groove 121. The wiring plate 13 has a stepped portion 131 extending toward the connector 4, and the wiring portion 12 has a stepped groove 122 at the through groove 121 that mates with the stepped portion 131. When the wiring plate 13 is installed in the through groove 121, the stepped portion 131 can extend the distance between the outer opening of the through groove 121 and the connector 4, thereby providing a safer creepage distance. Since the wiring housing 1 is injection molded, the injection-molded product will shrink after cooling. In order to ensure that the stepped groove 122 can shrink evenly after the wiring housing 1 is injection molded, and to prevent the stepped portion 131 of the wiring board 13 from failing to fit into the stepped groove 122, the outer wall of the wiring portion 12 is provided with a recessed portion 123 at the position corresponding to the stepped groove 122, so that the wall thickness difference at the arrangement groove 43 of the wiring portion 12 is small, thereby making the shrinkage difference small, so that the stepped portion 131 can be embedded into the stepped groove 122.

[0043] Reference Figure 5 An extending protrusion 115 is provided along the length of one side edge of the housing body 11 to increase the creepage distance in the width direction of the housing body 11.

[0044] Reference Figure 5 and Figure 7The terminal cover 2 and the wiring housing 1 are connected by a through-hole snap-fit ​​structure. The snap-fit ​​structure includes a snap-fit ​​protrusion 116 disposed on the top of the side of the housing column and a snap-fit ​​groove 21 disposed on the inner side wall of the terminal cover 2. When the terminal cover 2 closes the housing body 11, the snap-fit ​​protrusion 116 can be snapped into the snap-fit ​​groove 21. In this embodiment, there are two snap-fit ​​protrusions 116, which are respectively disposed on the top of two opposite sides of the wiring housing 1, and there are two snap-fit ​​grooves 21, which are arranged in a one-to-one correspondence with the two snap-fit ​​protrusions 116.

[0045] Combination Figures 1 to 7 The implementation principle of a photovoltaic junction box in this application embodiment is as follows: when the pin of diode 3 is connected to the terminal block 4, one side of the pin of diode 3 can be attached to the contact surface 431 of the arrangement groove 43, so that the contact area between the pin of diode 3 and the terminal block 4 is large, thereby reducing the resistance. When the current through diode 3 is large, the heat generated is small, and the heat-conducting sheet 41 can dissipate the heat.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A photovoltaic junction box, comprising a junction housing (1), a junction end cap (2), a diode (3), and a connector (4) for connecting the pins of the diode (3), characterized in that, The connector (4) includes a heat-conducting plate (41) and a bent portion (42) that connects the heat-conducting plate (41) and is used to connect the pin of the diode (3). An arrangement groove (43) for the pin of the diode (3) to be snapped into place is formed between the bent portion (42) and the heat-conducting plate (41). The arrangement groove (43) has a contact surface (431). When the pin of the diode (3) is arranged in the arrangement groove (43), the contact surface (431) is in contact with the outer side wall of the pin of the diode (3).

2. A photovoltaic junction box according to claim 1, characterized in that, The bent portion (42) is provided with an extension (421) at the opening of the arrangement groove (43) for abutting the pin of the diode (3) against the arrangement groove (43).

3. A photovoltaic junction box according to claim 2, characterized in that, The extension (421) is provided with an inclined guide surface (4211).

4. A photovoltaic junction box according to claim 1, characterized in that, The inner bottom surface of the wiring housing (1) is provided with a support column (112) for supporting the heat-conducting plate (41), and the heat-conducting plate (41) is provided with a positioning hole for cooperating with the support column (112).

5. A photovoltaic junction box according to claim 1, characterized in that, The bottom of the wiring housing (1) is provided with a busbar (113) that runs through the upper and lower surfaces, and on both sides of the busbar (113) are provided support side plates (114) for supporting the end of the heat-conducting plate (41) facing the diode (3). The two support side plates (114) are provided with abutting surfaces (1141) on the side facing each other for the busbar connecting the heat-conducting plate (41) to abut against.

6. A photovoltaic junction box according to claim 1, characterized in that, The wiring housing (1) has a through groove (121) for the cable connecting the connector (4) to pass through, and a connector plate (13) is provided at the bottom of the through groove (121) to cover the through groove (121); the connector plate (13) has a stepped portion (131) extending toward the connector (4), and the wiring housing (1) has a stepped groove (122) at the through groove (121) for cooperating with the stepped portion (131).

7. A photovoltaic junction box according to claim 6, characterized in that, The outer surface of the wiring housing (1) is provided with a recess (123) corresponding to the stepped groove (122).

8. A photovoltaic junction box according to claim 1, characterized in that, The bottom side of the wiring housing (1) is provided with an extending protrusion (115) along the length direction.

Images