A photovoltaic cell junction box

Abstract

The utility model discloses a photovoltaic cell terminal box, including box body, be equipped with at least two conducting sheet in box body, adjacent conducting sheet between link with diode, the conducting sheet crimp after become the U type of horizontal placement, form conducting sheet upper layer and conducting sheet lower layer, in the opening end of U type, the part of conducting sheet upper layer is bent down and forms first end to the front, the part of conducting sheet lower layer is bent up and forms second end to the back, and first end and second end are all staggered in horizontal direction and vertical direction, and the pin of diode is clamped in the longitudinal staggered interval of first end and second end and is closely matched, the utility model discloses have good conductivity, heat dissipation effect, can save the area of terminal box obviously, and the connection of conducting sheet and diode is more stable.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic cell technology, and in particular relates to a photovoltaic cell junction box. Background Technology

[0002] A photovoltaic (PV) cell, or solar cell, is a thin-film photovoltaic semiconductor that directly generates electricity using sunlight. When exposed to sufficient light, it can instantly output voltage and, in the presence of a circuit, produce current. The junction box is crucial in PV modules, primarily connecting the electricity generated by the solar cells to external wiring. Traditional junction boxes contain diodes, conductive plates, and solder. The diodes and conductive plates are manufactured independently. The diode chip is soldered onto the positive and negative leads, and then encapsulated with potting compound. The diode leads are then soldered onto the conductive plates.

[0003] For example, CN215186639U discloses a conductive structure for a photovoltaic cell junction box, including conductive sheets and a bypass assembly. The bypass assembly includes a housing, a chip, and four pins. The housing is hollow, and the chip is placed inside the housing. The four pins are grouped in pairs and fixed to both sides of the housing, with the chip electrically connected to the four pins. The conductive sheets include a first conductive sheet and a second conductive sheet, respectively placed on both sides of the bypass assembly. The pins on both sides of the bypass assembly are welded and fixed to the first and second conductive sheets, respectively. Busbar grooves are formed between the two sides of the bypass assembly and the two conductive sheets. In the structure of the photovoltaic junction box, the core is to connect the busbars with conductive sheets, and then connect and rectify adjacent conductive sheets with diodes. Since diodes generate heat when working, the conductive sheets serve both to conduct electricity and to dissipate heat. Obviously, the larger the area of ​​the conductive sheet, the better its heat dissipation effect. However, the junction box has size requirements and cannot accommodate very large conductive sheets. At the same time, to ensure the stability of the connection between the diodes and the conductive sheets, welding alone is insufficient. Summary of the Invention

[0004] The purpose of this invention is to provide a photovoltaic cell junction box that, on the one hand, provides more heat dissipation area in a limited space, and on the other hand, ensures stable diode connection.

[0005] Therefore, this utility model adopts the following technical solution: a photovoltaic cell junction box, including a box body, with at least two conductive sheets inside the box body, adjacent conductive sheets being connected by diodes; characterized in that: the conductive sheets are rolled into a horizontal U-shape, forming an upper conductive sheet layer and a lower conductive sheet layer; at the open end of the U-shape, a portion of the upper conductive sheet layer is bent downward and forward to form a first end, and a portion of the lower conductive sheet layer is bent upward and backward to form a second end, the first end and the second end being misaligned in both the horizontal and vertical directions; the diode pins are fitted tightly within the vertical misalignment range of the first end and the second end.

[0006] The diode's leads are soldered to the upper or lower layer of the conductive sheet.

[0007] The upper layer of the conductive sheet is bent downwards on both sides to form a side bend, which overlaps with the lower layer of the conductive sheet.

[0008] This invention involves rolling the conductive sheet into two layers. The electrical and thermal conductivity of the sheet is determined by the total area of ​​the two layers, resulting in excellent conductivity and heat dissipation. Furthermore, the area occupied by the conductive sheet in the junction box is determined by the larger of the two rolled layers, thus significantly saving space. While this increases the height of the junction box, this is not a new issue as the height is already ample. Additionally, the misalignment of the first and second ends and their interference fit with the diode pins effectively secure the conductive sheet and diode. The welding further enhances the stability of the connection. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the present invention.

[0010] Figure 2 yes Figure 1 A schematic diagram of its breakdown.

[0011] Figures 3 to 5 This is a schematic diagram of the conductive sheet and diode in Embodiment 1.

[0012] Figure 6 This is a schematic diagram of the conductive sheet in Example 2. Detailed Implementation

[0013] See Figure 1 , Figure 2 This utility model includes a box body 1, a box cover 2, and a cable 3. The cable extends into the box body and connects to conductive plates inside the box body, and is fixed by a wire clamping block 6. The box cover covers the box body to form a closed space. The core components inside the box body are two conductive plates 4 and a diode 5, with the diode soldered between the two conductive plates. It should be noted that the conductive plates are installed in the box body in an inverted manner. Figure 2 What is shown in the image is the lower layer of the conductive sheet.

[0014] See Figure 3 , Figure 4 , Figure 5 In this embodiment, the conductive sheet 4 is rolled to form an upper conductive sheet 42 and a lower conductive sheet 41, constituting a horizontal U-shape. At the open end of the U-shape, a portion of the upper conductive sheet 42 bends downward and forward to form a first end 43, and a portion of the lower conductive sheet 41 bends upward and backward to form a second end 44. Here, "forward" and "backward" refer to the perspective of the observer facing the U-shaped opening. The first end and the second end are misaligned in both the horizontal and vertical directions. Here, "horizontal" refers to the perspective of the observer facing the horizontal U-shaped opening, and "vertical" refers to the distance between the first end and the second end relative to the bottom end of the U-shape. The pin 51 of the diode 5 is snapped between the first end and the second end, and 40 is a soldering area where the pin is soldered to the lower conductive sheet 41 using a soldering process.

[0015] See Figure 6 This embodiment can be compared with the previous embodiment. The difference is that the two sides of the upper layer 42 of the conductive sheet are bent downward to form side bends 45, and the lower end overlaps the lower layer 41 of the conductive sheet, thereby forming a circuit when conducting electricity and heat.

Claims

1. A photovoltaic cell junction box, comprising a box body, wherein at least two conductive plates are disposed within the box body, and adjacent conductive plates are connected by diodes; characterized in that: The conductive sheet is rolled into a horizontal U-shape, forming an upper conductive sheet layer and a lower conductive sheet layer. At the open end of the U-shape, a portion of the upper conductive sheet layer bends downward and forward to form a first end, and a portion of the lower conductive sheet layer bends upward and backward to form a second end. The first end and the second end are misaligned in both the horizontal and vertical directions. The diode pins are fitted tightly within the vertical misalignment range of the first end and the second end.

2. A photovoltaic cell junction box as described in claim 1, characterized in that: The diode's leads are soldered to the upper or lower layer of the conductive sheet.

3. A photovoltaic cell junction box as described in claim 1 or 2, characterized in that: The upper layer of the conductive sheet is bent downwards on both sides to form a side bend, which overlaps with the lower layer of the conductive sheet.

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