Photovoltaic junction box

Abstract

The invention belongs to the field of photovoltaic technology, and discloses a photovoltaic junction box which is used for connecting four bus bars. The photovoltaic junction box comprises a box body, and a conducting strip, a first diode and a second diode which are arranged in the box body. The first diodes and the second diodes are distributed at intervals along the length direction of the box body, and the connecting end parts of the four bus bars extend into the box body and are conductively connected with the conducting strip; two of the four bus bars are distributed along the length direction of the box body, and the two bus bars distributed along the length direction of the box body are respectively staggered with the first diode and the second diode in the width direction of the box body. According to the photovoltaic junction box, the two bus bars distributed in the length direction of the box body are arranged to be staggered with the first diode and the second diode in the width direction of the box body, so that the two bus bars are prevented from being affected by the first diode and the second diode when the temperature is too high, and local high temperature of the bus bars is avoided; and the heat in the box body is uniformly distributed.

Description

Technical Field

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

[0002] The photovoltaic junction box is an important part of the photovoltaic module, which plays a role in connection and protection. At present, a general photovoltaic module is provided with two busbars, and the photovoltaic junction box is used to connect the two busbars.

[0003] However, currently the photovoltaic module begins to adopt the four-piece technology to improve the power of the existing photovoltaic module. Due to the adjustment of the photovoltaic module, the original junction box is no longer applicable to the photovoltaic module adopting the four-piece technology. In order to be applicable to this photovoltaic module, in the prior art, the original photovoltaic junction boxes are combined into one junction box, but the heat in the box body of the combined junction box is too concentrated, resulting in unsatisfactory heat dissipation. Summary of the Invention

[0004] The purpose of the present invention is to provide a photovoltaic junction box, which avoids heat concentration and improves the heat dissipation efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A photovoltaic junction box for connecting four busbars;

[0007] The photovoltaic junction box includes a box body, and a conductive sheet, a first diode and a second diode arranged in the box body. The first diode and the second diode are spaced apart along the length direction of the box body and are electrically connected to the conductive sheet. The connecting ends of the four busbars extend into the box body and are electrically connected to the conductive sheet;

[0008] Wherein, two of the busbars are distributed along the width direction of the box body, and the other two busbars are distributed along the length direction of the box body, and the two busbars distributed along the length direction of the box body are respectively misaligned with the first diode and the second diode in the width direction of the box body.

[0009] As an optional solution, the first diode is provided with two first pins, and the second diode is provided with two second pins;

[0010] The conductive sheet includes a first conductive sheet, a second conductive sheet and a third conductive sheet. The two first pins are respectively electrically connected to the first conductive sheet and the third conductive sheet, and the two second pins are respectively electrically connected to the second conductive sheet and the third conductive sheet;

[0011] The connecting ends of the two bus bars distributed along the length direction of the box body are electrically connected to the first conductive sheet and the second conductive sheet respectively; the two bus bars distributed along the width direction of the box body are both electrically connected to the third conductive sheet.

[0012] As an alternative, notches are provided on one side of the first conductive sheet and the second conductive sheet along the width direction of the box body, and the first diode and the second diode are respectively arranged in the two notches;

[0013] The two bus bars distributed along the length direction of the box body are respectively displaced in the width direction of the box body from the two notches.

[0014] As an alternative, the projection of the first pin near the second diode and one of the bus bars distributed along the length direction of the box body in the depth direction of the box body partially overlaps;

[0015] The projection of the second pin near the first diode and the bus bar distributed along the width direction of the box body in the depth direction of the box body partially overlaps.

[0016] As an alternative, the third conductive sheet includes a first conductive part and a second conductive part connected to each other, and the first conductive part, the first conductive sheet, the second conductive part and the second conductive sheet are sequentially spaced apart;

[0017] The first diode is arranged between the first conductive part and the first conductive sheet, and the two first pins are respectively electrically connected to the first conductive part and the first conductive sheet. The second diode is arranged between the second conductive part and the second conductive sheet, and the two second pins are respectively electrically connected to the second conductive part and the second conductive sheet;

[0018] The two bus bars distributed along the width direction of the box body are both electrically connected to the second conductive part.

[0019] As an alternative, bending edges are provided on the other three side edges of the first conductive part except for the side edge facing the first diode.

[0020] As an alternative, the box body is provided with a partition board, and the partition board is clamped between the first conductive part and the first conductive sheet.

[0021] As an alternative, the box body is further provided with a first guide groove corresponding to the first conductive sheet, a second guide groove corresponding to the second conductive sheet, and a third guide groove corresponding to the third conductive sheet;

[0022] The connecting ends of the two bus bars distributed along the length direction of the box body are respectively inserted into the first guide groove and the second guide groove, and are respectively electrically connected to the first conductive sheet and the second conductive sheet;

[0023] The two bus bars distributed along the width direction of the box body are connected to each other, and the connecting end of one of the two bus bars distributed along the width direction of the box body is inserted into the third guide groove and is electrically connected to the third conductive sheet.

[0024] As an alternative, the first guide groove is composed of two spaced first vertical plates arranged on the box body. The height of the first vertical plate away from the first conductive sheet is equal to the height of the first conductive sheet and is higher than the first vertical plate close to the first conductive sheet;

[0025] The second guide groove is composed of two spaced second vertical plates arranged on the box body. The height of the second vertical plate away from the second conductive sheet is equal to the height of the second conductive sheet and is higher than the second vertical plate close to the second conductive sheet;

[0026] The third guide groove is composed of two spaced third vertical plates arranged on the box body. The height of the third vertical plate away from the third conductive sheet is equal to the height of the third conductive sheet and is higher than the third vertical plate close to the third conductive sheet.

[0027] As an alternative, the photovoltaic junction box further includes a cable, the cable is electrically connected to the second conductive sheet, and the cable contacts the second pin.

[0028] Advantages of the present invention:

[0029] In the photovoltaic junction box provided by the present invention, by arranging the two bus bars distributed along the length direction of the box body so that the projections of the first diode and the second diode in the depth direction of the box body do not overlap, the influence of the first diode and the second diode on the two bus bars respectively when the temperature is too high is avoided, the local high temperature of the bus bar is avoided, the heat distribution in the box body is made uniform, and the bus bar can quickly conduct the temperature on the conductive sheet, improving the heat dissipation effect. Description of the drawings

[0030] Figure 1 is a schematic structural diagram of the photovoltaic junction box provided by the embodiment of the present invention;

[0031] Figure 2 is a schematic structural diagram of the photovoltaic junction box (front view) and the bus bar provided by the embodiment of the present invention;

[0032] Figure 3It is a schematic structural diagram of a photovoltaic junction box (back side) and a bus bar provided by an embodiment of the present invention;

[0033] Figure 4 It is a schematic structural diagram of a conductive sheet involved in an embodiment of the present invention;

[0034] Figure 5 It is a schematic structural diagram of a third conductive sheet involved in an embodiment of the present invention;

[0035] Figure 6 is Figure 1 an enlarged structural view of part A in

[0036] Figure 7 It is a schematic structural diagram of a cable and a second pin involved in an embodiment of the present invention.

[0037] In the figure:

[0038] 100, bus bar; 101, connecting end;

[0039] 1, box body; 11, partition board; 12, first guide groove; 121, first vertical plate; 13, second guide groove; 131, second vertical plate; 14, third guide groove; 141, third vertical plate; 15, convex groove;

[0040] 2, first diode; 21, first pin;

[0041] 3, second diode; 31, second pin;

[0042] 4, first conductive sheet;

[0043] 5, second conductive sheet; 51, second potting port;

[0044] 6, third conductive sheet; 61, first conductive part; 611, bending edge; 612, first potting port; 62, second conductive part; 63, connecting part;

[0045] 7, notch;

[0046] 8, cable. Detailed implementation manners

[0047] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. It may also be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the description of the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first feature and the second feature, or may also include the situation where the first feature and the second feature are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above and to the right", and "above and to the left" of the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and to the right", and "below and to the left" of the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0050] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0051] As Figures 1-3 shown, an embodiment of the present invention provides a photovoltaic junction box, which is used to adapt to photovoltaic modules adopting the four-piece technology, that is, the photovoltaic junction box can be connected to four busbars 100 on the photovoltaic module.

[0052] The photovoltaic junction box includes a box body 1, and conductive sheets, a first diode 2, and a second diode 3 arranged inside the box body 1. Among them, the first diode 2 and the second diode 3 are distributed at intervals along the length direction of the box body 1 (i.e., the X-axis direction shown in the figure). The connecting ends 101 of the four busbars 100 extend into the box body 1 and are conductively connected to the conductive sheets; and two of the four busbars 100 are distributed along the width direction of the box body 1 (i.e., the Y-axis shown in the figure), and the remaining two busbars 100 are distributed along the length direction of the box body 1. The projections of the two busbars 100 distributed along the length direction of the box body 1 on the first diode 2 and the second diode 3 in the depth direction of the box body 1 (i.e., the Z-axis direction shown in the figure) do not overlap.

[0053] That is, the two bus bars 1 distributed along the length direction of the box body 1 are respectively misaligned with the first diode 2 and the second diode 2 in the width direction of the box body 1. Specifically: for the two bus bars 100 distributed along the length direction of the box body 1, one bus bar 100 and the first diode 2 are located on one side of the box body 1 along its length direction, and the two are misaligned in the width direction of the box body 1; the other bus bar 100 and the second diode 3 are located on the other side of the box body 1 along its length direction, and the two are misaligned in the width direction of the box body 1.

[0054] By setting the two bus bars 100 distributed along the length direction of the box body 1 so that their projections in the depth direction of the box body 1 do not coincide with the first diode 2 and the second diode 3 respectively, this photovoltaic junction box avoids the influence of the first diode 2 and the second diode 3 on the two bus bars 100 respectively when the temperature is too high, avoids local high temperature of the bus bars 100, makes the heat distribution in the box body 1 uniform, enables the bus bars 100 to quickly conduct the temperature on the conductive sheet, and improves the heat dissipation effect.

[0055] Specifically, the first diode 2 is provided with two first pins 21, and the second diode 3 is provided with two second pins 31; the conductive sheet includes a first conductive sheet 4, a second conductive sheet 5 and a third conductive sheet 6. The two first pins 21 are respectively conductively connected to the first conductive sheet 4 and the third conductive sheet 6, and the two second pins 31 are respectively conductively connected to the second conductive sheet 5 and the third conductive sheet 6. This structure enables the heat generated by the first diode 2 to be transferred to the first conductive sheet 4 and the third conductive sheet 6 through the two first pins 21, and enables the heat generated by the second diode 3 to be transferred to the second conductive sheet 5 and the third conductive sheet 6 through the two second pins 31. And the connecting ends 101 of the two bus bars 100 distributed along the length direction of the box body 1 are respectively conductively connected to the first conductive sheet 4 and the second conductive sheet 5; the other two bus bars 100 are distributed along the width direction of the box body 1 and are both conductively connected to the third conductive sheet 6. This structure enables the two bus bars 100 along the length direction of the box body 1 to respectively conduct the heat on the first conductive sheet 4 and the second conductive sheet 5, and enables the two bus bars 100 along the width direction of the box body 1 to conduct the heat on the third conductive sheet 6.

[0056] In this embodiment, the two first pins 21 are respectively welded to the first conductive sheet 4 and the third conductive sheet 6; the two second pins 31 are respectively welded to the second conductive sheet 5 and the third conductive sheet 6; the two bus bars 100 distributed along the length direction of the box body 1 are respectively welded to the first conductive sheet 4 and the second conductive sheet 5; the two bus bars 100 distributed along the width direction of the box body 1 are both welded to the third conductive sheet 6, or after the two bus bars 100 distributed along the width direction of the box body 1 are welded to each other, one of the bus bars 100 is welded to the third conductive sheet 6.

[0057] Furthermore, if Figure 4 As shown, the first conductive sheet 4 and the second conductive sheet 5 are both provided with a notch 7 on one side along the width direction of the box body 1, and the first diode 2 and the second diode 3 are respectively provided in the two notches 7; the two busbars 100 distributed along the length direction of the box body 1 do not overlap with the projections of the two notches 7 in the depth direction of the box body 1, that is, along the width direction of the box body 1, the busbars 100 and the corresponding notches 7 are staggered. By providing the notches 7 on the first conductive sheet 4 and the second conductive sheet 5, the first diode 2 and the second diode 3 can be distributed close to one side of the box body 1 along the width direction of the box body 1, making the structure compact, and the first diode 2 and the second diode 3 are close to one side of the box body 1, so that part of the heat of the first diode 2 and the second diode 3 can be discharged through the box body 1, thereby improving the heat dissipation capacity.

[0058] Specifically, the third conductive sheet 6 includes a first conductive portion 61 and a second conductive portion 62 connected to each other, the first conductive portion 61 and the second conductive portion 62 are connected through a connecting portion 63, the first conductive portion 61, the first conductive sheet 4, the second conductive portion 62 and the second conductive sheet 5 are sequentially spaced, the first diode 2 is arranged in the notch 7 of the first conductive sheet 4 and is located between the first conductive portion 61 and the first conductive sheet 4, the two first pins 21 are respectively conductively connected to the first conductive portion 61 and the first conductive sheet 4 (i.e., achieved by welding), the second diode 3 is arranged in the notch 7 of the second conductive sheet 5 and is located between the second conductive portion 62 and the second conductive sheet 5, and the two second pins 31 are respectively conductively connected to the second conductive portion 62 and the second conductive sheet 5 (i.e., achieved by welding). By setting the third conductive sheet 6 as the first conductive portion 61 and the second conductive portion 62 connected to each other, it is more convenient to connect the first diode 2 and the second diode 3 to the third conductive sheet 6, and the overall layout of components is more reasonable.

[0059] Alternatively, if Figure 5 As shown, the three side edges of the first conductive portion 61 except the side edge facing the first diode 2 are all provided with bent edges 611. By providing multiple bent edges 611 on the first conductive portion 61, the heat dissipation area can be increased to improve the heat dissipation efficiency.

[0060] In order to further improve the heat dissipation capacity of the photovoltaic junction box, refer to Figure 2, the first pin 21 close to the second diode 3 coincides with a projection part in the depth direction of the box body 1 of a bus bar 100 distributed along the length direction of the box body 1 (the bus bar 100 on the same side as the first diode 2 along the length direction of the box body 1); the second pin 31 close to the first diode 2 coincides with a projection part in the depth direction of the box body 1 of the bus bar 100 distributed along the width direction of the box body 1. By arranging a part of the first pin 21 below the corresponding bus bar 100 and arranging a part of the second pin 31 below the corresponding bus bar 100, this structure can reduce the heat transfer time, enabling the first diode 2 and the second diode 3 to quickly transfer heat to the corresponding bus bar 100 through the first pin 21 and the second pin 31 respectively, and effectively improving the heat dissipation efficiency.

[0061] Optionally, the first pin 21 close to the second diode 3 and the second pin 31 close to the first diode 2 can be bent so that the projection part of the first pin 21 and the corresponding bus bar 100 in the depth direction of the box body 1 coincides, and the projection part of the second pin 31 and the corresponding bus bar 100 in the depth direction of the box body 1 coincides. And at the same time, the other first pin 21 and the other second pin 31 are also bent, increasing the contact area between the other first pin 21 and the first conductive part 61, and increasing the contact area between the other second pin 31 and the second conductive sheet 5, making the heat transfer efficiency higher.

[0062] Optionally, a partition board 11 is arranged in the box body 1, and the partition board 11 is clamped between the first conductive part 61 and the first conductive sheet 4. The partition board 11 can prevent the first conductive part 61 and the first conductive sheet 4 from contacting each other. Specifically, notch openings are arranged on the opposite sides of the first conductive part 61 and the first conductive sheet 4, and the partition board 11 is limited within the two notch openings.

[0063] Optionally, two first potting ports 612 are opened on one side of the first conductive part 61 along the width direction of the box body 1 close to the box body 1, and potting can be realized through the two first potting ports 612; and when the second diode 3 is arranged in the notch 7 of the second conductive sheet 5, there are also two second potting ports 51 between the second diode 3 and the second conductive sheet 5, and potting can also be realized.

[0064] To facilitate the welding of the connecting ends 101 of the two bus bars 100 along the length direction of the box body 1 to the first conductive sheet 4 and the second conductive sheet 5 respectively, and to avoid interference between the welding head of the welding equipment and the side wall of the box body 1, optionally, two convex grooves 15 protruding outward are provided on one side wall of the box body 1 close to the bus bar 100 along its width direction. The two convex grooves 15 correspond to the connecting ends 101 of the two bus bars 100 respectively (i.e., correspond to the first guide groove 12 and the second guide groove 13 mentioned below), and the two convex grooves 15 can respectively avoid the two welding heads. And by providing the convex groove 15 structure on the side wall of the box body 1, the structural strength of the box body 1 can also be increased; in addition, potting can also be realized through the convex groove 15.

[0065] Potting can be realized through the above-mentioned first potting port 612, second potting port 51 and convex groove 15, making the potting in the box body 1 more uniform and the filling more sufficient.

[0066] Optionally, as Figure 6 and in combination with Figure 1 As shown, the box body 1 is further provided with a first guide groove 12, a second guide groove 13 and a third guide groove 14 corresponding to the second conductive parts 62 of the first conductive sheet 4, the second conductive sheet 5 and the third conductive sheet 6 respectively; the first guide groove 12 corresponding to the first conductive sheet 4 and the second guide groove 13 corresponding to the second conductive sheet 5 are distributed at intervals along the length direction of the box body 1 and are located between the first conductive sheet 4 and the second conductive sheet 5, and the third guide groove 14 corresponding to the second conductive part 62 is distributed along the width direction of the box body 1 and is located between the side wall of the box body 1 and the second conductive part 62; the connecting ends 101 of the two bus bars 100 distributed along the length direction of the box body 1 respectively pass through the corresponding first guide groove 12 and second guide groove 13 and are electrically connected to the first conductive sheet 4 and the second conductive sheet 5 respectively, that is, the two bus bars 100 penetrate into the first guide groove 12 and the second guide groove 13 from below the box body 1 and are respectively welded to the upper sides of the first conductive sheet 4 and the second conductive sheet 5; after the two bus bars 100 distributed along the width direction of the box body 1 are welded to each other, one of the bus bars 100 passes through the third guide groove 14 corresponding to the second conductive part 62 and is electrically connected to the second conductive part 62 of the third conductive sheet 6, that is, the two bus bars 100 are welded to each other, and the connecting end 101 of one of the bus bars 100 passes through the corresponding third guide groove 14 from below the box body 1 and is welded to the upper side of the second conductive part 62. By providing the first guide groove 12, the second guide groove 13 and the third guide groove 14 in the box body 1, the connection operation of the bus bar 100 is made convenient.

[0067] Specifically, the first guide groove 12 is composed of two first vertical plates 121 spaced apart and provided on the box body 1. The height of the first vertical plate 121 away from the first conductive sheet 4 (i.e., along the depth direction of the box body 1) is equal to the height of the first conductive sheet 4 and is higher than the first vertical plate 121 close to the first conductive sheet 4; the second guide groove 13 is composed of two second vertical plates 131 spaced apart and provided on the box body 1. The height of the second vertical plate 131 away from the second conductive sheet 5 is equal to the height of the second conductive sheet 5 and is higher than the second vertical plate 131 close to the second conductive sheet 5; the third guide groove 14 is composed of two third vertical plates 141 spaced apart and provided on the box body 1. The height of the third vertical plate 141 away from the second conductive part 62 is equal to the height of the second conductive part 62 and is higher than the third vertical plate 141 close to the second conductive part 62. When the welding head welds the bus bar 100 to the first conductive sheet 4, the welding head abuts against the first conductive sheet 4 and the first vertical plate 121 away from the first conductive sheet 4 at the same time, so that the first vertical plate 121 can play a supporting role; when the welding head welds the bus bar 100 to the second conductive sheet 5, the welding head abuts against the second conductive sheet 5 and the second vertical plate 131 away from the second conductive sheet 5 at the same time, so that the second vertical plate 131 can play a supporting role; when the welding head welds the bus bar 100 to the second conductive part 62, the welding head abuts against the second conductive part 62 and the third vertical plate 141 away from the second conductive part 62 at the same time, so that the third vertical plate 141 can play a supporting role; this structure makes the welding operation more convenient and the connection more firm.

[0068] The two first pins 21 are respectively welded to the lower sides of the first conductive part 61 and the first conductive sheet 4, and the two second pins 31 are respectively welded to the lower sides of the second conductive part 62 and the second conductive sheet 5.

[0069] As Figure 7 and in combination with Figure 1 shown, the photovoltaic junction box further includes a cable 8. The cable 8 is conductively connected to the lower side of the second conductive sheet 5, and the cable 8 is in contact with the second pin 31, that is, the second pin 31 is welded to the second conductive sheet 5, and the cable 8 is welded to the second pin 31. This structural design enables a part of the heat generated by the second diode 3 to be transferred to the cable 8 through the second pin 31, and the cable 8 exports the heat out of the box body 1, further improving the heat dissipation efficiency.

[0070] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Photovoltaic junction box, characterized in that, For connecting four bus bars (100); The photovoltaic junction box includes a box body (1), a conductive sheet, a first diode (2) and a second diode (3) disposed in the box body (1). The first diode (2) and the second diode (3) are spaced apart along the length direction of the box body (1) and are electrically connected to the conductive sheet. The connecting ends (101) of the four bus bars (100) extend into the box body (1) and are electrically connected to the conductive sheet; Wherein, two of the bus bars (100) are distributed along the width direction of the box body (1), and the other two bus bars (100) are distributed along the length direction of the box body (1). The two bus bars (100) distributed along the length direction of the box body (1) are respectively misaligned with the first diode (2) and the second diode (3) in the width direction of the box body (1).

2. The photovoltaic junction box according to claim 1, characterized in that, The first diode (2) is provided with two first pins (21), and the second diode (3) is provided with two second pins (31); The conductive sheet includes a first conductive sheet (4), a second conductive sheet (5) and a third conductive sheet (6). The two first pins (21) are respectively electrically connected to the first conductive sheet (4) and the third conductive sheet (6), and the two second pins (31) are respectively electrically connected to the second conductive sheet (5) and the third conductive sheet (6); The connecting ends (101) of the two bus bars (100) distributed along the length direction of the box body (1) are respectively electrically connected to the first conductive sheet (4) and the second conductive sheet (5); the two bus bars (100) distributed along the width direction of the box body (1) are both electrically connected to the third conductive sheet (6).

3. The photovoltaic junction box according to claim 2, characterized in that, Notches (7) are provided on one side of the first conductive sheet (4) and the second conductive sheet (5) along the width direction of the box body (1), and the first diode (2) and the second diode (3) are respectively disposed in the two notches (7); The two bus bars (100) distributed along the length direction of the box body (1) are respectively misaligned with the two notches (7) in the width direction of the box body (1).

4. The photovoltaic junction box according to claim 2, characterized in that, The projection of the first pin (21) close to the second diode (3) and one of the bus bars (100) distributed along the length direction of the box body (1) in the depth direction of the box body (1) partially overlaps; The projection of the second pin (31) close to the first diode (2) and the bus bar (100) distributed along the width direction of the box body (1) in the depth direction of the box body (1) partially overlaps.

5. The photovoltaic junction box according to claim 2, characterized in that, The third conductive sheet (6) includes a first conductive part (61) and a second conductive part (62) connected to each other. The first conductive part (61), the first conductive sheet (4), the second conductive part (62) and the second conductive sheet (5) are sequentially spaced apart; The first diode (2) is disposed between the first conductive part (61) and the first conductive sheet (4), and the two first pins (21) are electrically connected to the first conductive part (61) and the first conductive sheet (4) respectively. The second diode (3) is disposed between the second conductive part (62) and the second conductive sheet (5), and the two second pins (31) are electrically connected to the second conductive part (62) and the second conductive sheet (5) respectively; Both of the two bus bars (100) distributed along the width direction of the box body (1) are electrically connected to the second conductive part (62).

6. The photovoltaic junction box according to claim 5, wherein, Bending edges (611) are provided on the other three side edges of the first conductive part (61) except for the side edge facing the first diode (2).

7. The photovoltaic junction box according to claim 5, wherein, The box body (1) is provided with a partition board (11), and the partition board (11) is clamped between the first conductive part (61) and the first conductive sheet (4).

8. The photovoltaic junction box according to claim 2, characterized in that, The box body (1) is further provided with a first guide groove (12) corresponding to the first conductive sheet (4), a second guide groove (13) corresponding to the second conductive sheet (5), and a third guide groove (14) corresponding to the third conductive sheet (6); The connecting ends (101) of the two bus bars (100) distributed along the length direction of the box body (1) are respectively inserted through the first guide groove (12) and the second guide groove (13), and are electrically connected to the first conductive sheet (4) and the second conductive sheet (5) respectively; The two bus bars (100) distributed along the width direction of the box body (1) are connected to each other, and the connecting end of one of the two bus bars (100) distributed along the width direction of the box body (1) is inserted through the third guide groove (14) and is electrically connected to the third conductive sheet (6).

9. The photovoltaic junction box according to claim 8, wherein, The first guide groove (12) is composed of two spaced first vertical plates (121) provided on the box body (1). The height of the first vertical plate (121) far from the first conductive sheet (4) is equal to the height of the first conductive sheet (4) and is higher than the first vertical plate (121) close to the first conductive sheet (4); The second guide groove (13) is composed of two spaced second vertical plates (131) provided on the box body (1). The height of the second vertical plate (131) far from the second conductive sheet (5) is equal to the height of the second conductive sheet (5) and is higher than the second vertical plate (131) close to the second conductive sheet (5); The third guide groove (14) is composed of two spaced third vertical plates (141) provided on the box body (1). The height of the third vertical plate (141) far from the third conductive sheet (6) is equal to the height of the third conductive sheet (6) and is higher than the third vertical plate (141) close to the third conductive sheet (6).

10. The photovoltaic junction box according to claim 2, characterized in that, The photovoltaic junction box further includes a cable (8), the cable (8) is electrically connected to the second conductive sheet (5), and the cable (8) contacts the second pin (31).

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