Photovoltaic junction box

Abstract

The utility model belongs to the field of solar photovoltaic technology, and specifically discloses a photovoltaic junction box. According to the photovoltaic junction box provided by the utility model, the pins of the diodes are welded with the welding parts of the heat dissipation pieces, so that heat generated when the diodes work can be dissipated through the heat dissipation pieces; the pins of the diodes are welded with the heat dissipation piece, so that the bus bar welding surfaces are formed on the surfaces of the pins of the diodes, and the bus bars are welded with the bus bar welding surfaces, so that direct conductive connection between the bus bars and the pins of the diodes is realized; the current flows through the first bus bar, the first pin of the diode, the diode, the second pin of the diode and the second bus bar in sequence, the intermediate medium through which the current flows is reduced, the loss of electric energy is further reduced, in addition, the bus bars are directly connected with the pins of the diode, heat generated by the diode can be dissipated through the bus bars, and the service life of the diode is prolonged. Therefore, the overall heat dissipation efficiency of the photovoltaic junction box is improved.

Description

Technical Field

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

[0002] A photovoltaic junction box is a connector between a photovoltaic array composed of photovoltaic cell modules and a photovoltaic cell charging control device. Its main function is to connect and protect the solar photovoltaic modules, connect the power generated by the photovoltaic cells to the external line, and conduct the electrical energy generated by the photovoltaic cell modules through cables.

[0003] Traditional photovoltaic (PV) junction boxes typically include a base, terminals, diodes, and a cover. The terminals are soldered to the diode pins, the diode with the soldered terminals is placed inside the base, the busbar is then soldered to the terminals, and finally, adhesive is poured into the base before the cover is fastened onto it. In existing PV junction boxes, the diodes and busbars require terminals as an intermediate conductive medium. Current must flow sequentially through the first busbar, the first terminal, the first pin of the diode, the second terminal, and the second busbar. This multiple intermediate mediums result in significant power loss, and the numerous soldering points increase the risk of cold solder joints, leading to poor heat dissipation within the PV junction box. Utility Model Content

[0004] The purpose of this utility model is to provide a photovoltaic junction box that reduces the power loss of the photovoltaic junction box and improves the internal heat dissipation efficiency of the photovoltaic junction box.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A photovoltaic junction box, comprising:

[0007] diode;

[0008] The heat sink includes a soldering portion, the pins of the diode are soldered to the soldering portion, and a busbar soldering surface for soldering to the busbar 4 is formed on the surface of the pins of the diode.

[0009] As an optional technical solution for the aforementioned photovoltaic junction box, the welding part includes a welding plate, and the pins of the diode are welded to the surface of the welding plate.

[0010] As an optional technical solution for the aforementioned photovoltaic junction box, the side surface of the welding plate used for welding with the pins of the diode is provided with multiple grooves at intervals.

[0011] As an optional technical solution for the aforementioned photovoltaic junction box, a first heat sink is provided on both sides of the welding part, and the first heat sink extends toward the side away from the welding part and the pin welding surface of the diode.

[0012] As an optional technical solution for the aforementioned photovoltaic junction box, the heat sink further includes a connecting part, one end of which is connected to one end of the welding part. A second heat sink is provided on both opposite sides of the connecting part. The second heat sink is set at an angle to the connecting part, and the second heat sink extends in a direction away from the connecting part.

[0013] As an optional technical solution for the aforementioned photovoltaic junction box, the photovoltaic junction box further includes a base, the heat sink is disposed inside the base, and the connecting part is fitted to the bottom wall of the base;

[0014] And / or, the projected area of ​​the connecting part on the bottom wall of the base is greater than the projected area of ​​the welding part on the bottom wall of the base.

[0015] As an optional technical solution for the aforementioned photovoltaic junction box, a third heat sink is provided at the other end of the connection portion. The third heat sink is set at an angle to the connection portion, and the third heat sink extends in a direction away from the connection portion.

[0016] As an optional technical solution for the aforementioned photovoltaic junction box, the photovoltaic junction box further includes a cable connector. One end of the cable connector is placed between the welding part and the pin of the diode. The cable connector is welded to the welding part and the pin of the diode respectively. The other end of the cable connector is electrically connected to a cable.

[0017] As an optional technical solution for the aforementioned photovoltaic junction box, one end of the cable connector is a plurality of spaced connecting plates, which are placed between the welding part and the pins of the diode.

[0018] As an optional technical solution for the aforementioned photovoltaic junction box, the cable connector includes a first plate, a second plate, and a third plate connected in sequence. The first plate consists of multiple connecting plates and is disposed between the welding part and the pin of the diode. The second plate is positioned higher than the first plate, and the third plate is positioned higher than the second plate. The third plate is electrically connected to the cable.

[0019] As an optional technical solution for the aforementioned photovoltaic junction box, the photovoltaic junction box further includes a base, the diode and the heat sink are disposed in the base, the bottom of the base is provided with a through hole, the through hole is used for the busbar to pass through and be welded to the welding surface of the busbar, and the base is filled with insulating glue.

[0020] The beneficial effects of this utility model are:

[0021] The photovoltaic junction box provided by this utility model has diode pins welded to the heat sink. Heat generated by the diode during operation can be transferred to the heat sink through the diode pins and dissipated through the heat sink. The diode pins are welded to the heat sink to form a busbar welding surface on the diode pins. Welding the busbars to each other achieves a direct conductive connection between the busbars and the diode pins, allowing current to flow sequentially through the first busbar, the first pin of the diode, the diode, the second pin of the diode, and the second busbar. This reduces the intermediate medium through which the current flows, thereby reducing energy loss. Furthermore, since the busbars are directly connected to the diode pins, the heat generated by the diode can also be dissipated from the photovoltaic junction box through the busbars, achieving efficient heat dissipation and improving the overall heat dissipation efficiency of the photovoltaic junction box. Attached Figure Description

[0022] Figure 1 This is an exploded view of a photovoltaic junction box of the positive electrode type provided in an embodiment of this utility model;

[0023] Figure 2 This is an axonometric view of the internal structure of the base provided in this embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the connection structure of the heat sink, diode, and cable connector provided in this embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the connection structure of the heat sink, diode, and cable connector when the busbar welding surface is not formed, according to an embodiment of this utility model.

[0026] Figure 5 This is a cross-sectional view of the internal structure of the base provided in this embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the base filled with insulating glue according to an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the base with the box cover fastened to it according to an embodiment of the present utility model;

[0029] Figure 8 This is a schematic diagram of a heat dissipation component provided in an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of another structure of the heat dissipation component provided in this embodiment of the utility model;

[0031] Figure 10 This is a schematic diagram of the structure of the welding part, cable connector and diode connection provided in the embodiment of this utility model;

[0032] Figure 11 This is a structural schematic diagram of the cable connector provided in an embodiment of the present utility model;

[0033] Figure 12 This is an exploded view of an intermediate-stage photovoltaic junction box provided in an embodiment of this utility model;

[0034] Figure 13 This is an exploded view of the negative electrode type photovoltaic junction box provided in this embodiment of the utility model.

[0035] In the picture:

[0036] 1. Diode; 2. Heat sink; 3. Busbar soldering surface; 4. Busbar; 5. Cable connector; 6. Cable; 7. Base; 8. Cover; 9. Wire clamp; 10. Insulating adhesive;

[0037] 21. Welding part; 211. Groove; 22. First heat sink plate; 23. Connecting part; 24. Second heat sink plate; 25. Third heat sink plate;

[0038] 51. First plate section; 511. Connecting plate; 52. Second plate section; 53. Third plate section. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] like Figures 1 to 4 As shown, this embodiment provides a photovoltaic junction box, which includes a diode 1 and a heat sink 2. The heat sink 2 includes a welding part 21, the pins of the diode 1 are welded to the welding part 21, and a busbar welding surface 3 for welding to the busbar 4 is formed on the surface of the pins of the diode 1. The pins of diode 1 are soldered to the soldering part 21 of heat sink 2. The heat generated by diode 1 during operation can be transferred to heat sink 2 through the pins of diode 1 and dissipated through heat sink 2. The soldering of the pins of diode 1 to heat sink 2 forms a busbar soldering surface 3 on the surface of the pins of diode 1. Busbar 4 is soldered to busbar soldering surface 3, realizing direct conductive connection between busbar 4 and the pins of diode 1. The current flows sequentially through the first busbar 4, the first pin of diode 1, diode 1, the second pin of diode 1, and the second busbar 4. The intermediate medium through which the current flows is reduced, thereby reducing power loss. In addition, since busbar 4 is directly connected to the pins of diode 1, the heat generated by diode 1 can also be dissipated from the photovoltaic junction box through busbar 4, which plays a role in efficient heat dissipation and improves the overall heat dissipation efficiency of the photovoltaic junction box.

[0044] Optionally, the leads of diode 1 are resistively welded to solder portion 21 to form busbar soldering surface 3, or the leads of diode 1 can be soldered to solder portion 21 to form busbar soldering surface 3, or the leads of diode 1 can be riveted to solder portion 21. Solder is added to busbar soldering surface 3, and busbar 4 can be soldered to busbar soldering surface 3 by soldering, or by laser soldering.

[0045] Diode 1 has two pins. Each pin of diode 1 is respectively provided with a heat sink 2 and a bus 4, so that the current flows sequentially through the first bus 4, the first pin of diode 1, diode 1, the second pin of diode 1, and the second bus 4.

[0046] like Figure 2 and Figure 5 As shown, the photovoltaic junction box also includes a base 7, with the diode 1 and heat sink 2 housed within the base 7. The bottom of the base 7 has a through-hole, through which one end of the busbar 4 passes and connects to the busbar welding surface 3. Specifically, one end of the busbar 4 is bent into a U-shape, and the busbar 4 is placed on the upper surface of the busbar welding surface 3. It is then soldered to the busbar welding surface 3, achieving a conductive connection between the busbar 4 and the pins of the diode 1, thereby realizing the electrical connection between the photovoltaic junction box and the photovoltaic cell.

[0047] like Figure 6 As shown, the base 7 is filled with insulating glue 10. The heat generated by the diode 1 when it is working can be dissipated to the outside of the photovoltaic junction box through the heat sink 2, the insulating glue 10 and the side wall of the base 7 in sequence. The insulating glue 10 also serves to fix the diode 1, the heat sink 2 and the busbar 4.

[0048] like Figure 7 As shown, the photovoltaic junction box also includes a cover 8. After the insulating glue 10 is poured into the base 7, the cover 8 is fastened onto the base 7 to protect the insulating glue 10 inside the base 7.

[0049] To improve the strength of the connection between the diode 1 pins and the solder joint 21, in some embodiments, the solder joint 21 includes a soldering plate, and the diode 1 pins are soldered to the surface of the soldering plate. During resistance welding, molten metal flows into and fills the groove 211. After the molten metal in the groove 211 solidifies, it connects to the diode 1 pins, improving the reliability of the connection between the diode 1 pins and the solder joint 21. Alternatively, during soldering, molten solder flows into and fills the groove 211. After the solder in the groove 211 solidifies, it connects to the diode 1 pins, further improving the reliability of the connection between the diode 1 pins and the solder joint 21.

[0050] Alternatively, the side surface of the welding plate used for welding to the pins of diode 1 is provided with a plurality of grooves 211 at intervals. During resistance welding, molten metal flows into the grooves 211, or during soldering, molten solder flows into the grooves 211, further improving the strength of the connection between the pins of diode 1 and the welding part 21.

[0051] like Figure 8 and Figure 9 As shown, a first heat sink 22 is provided on both opposite sides of the welding part 21. The first heat sink 22 extends away from the welding surface of the welding part 21 and the pin of the diode 1. The heat generated by the diode 1 during operation is transferred to the first heat sink 22 through the pin of the diode 1 and the busbar welding surface 3, and then dissipated to the outside through the insulating adhesive 10 and the side wall of the base 7, further improving the heat dissipation performance of the photovoltaic junction box. Optionally, the first heat sink 22 is connected to the edge of the welding plate of the welding part 21, and the first heat sink 22 is perpendicular to the welding plate, so that the heat sink 2 can be installed in the base 7 without affecting the connection between the pin of the diode 1 and the welding plate. In addition, the first heat sink 22 also plays a shielding role. During the resistance welding process, the first heat sink 22 can block the molten metal from flowing to both sides, reduce the loss of molten metal, and ensure the effective area of ​​the busbar welding surface 3. Alternatively, during the soldering process, the first heat sink 22 can block the molten solder from flowing to both sides, reducing solder loss and ensuring effective soldering between the pin of diode 1 and the soldering part 21, or effective soldering between the busbar soldering surface 3 and the busbar 4.

[0052] The heat sink 2 also includes a connecting portion 23, one end of which is connected to one end of the welding portion 21. Second heat sinks 24 are provided on opposite sides of the connecting portion 23, forming an angle with the connecting portion 23 and extending away from the connecting portion 23. The heat generated by the diode 1 during operation can also be dissipated through the connecting portion 23 and the two second heat sinks 24. Heat can also be dissipated to the outside through the connecting portion 23, the insulating adhesive 10, and the bottom wall of the base 7, as well as through the side walls of the connecting portion 23, the two second heat sinks 24, the insulating adhesive 10, and the base 7, further improving the heat dissipation performance of the photovoltaic junction box. The connecting portion 23 can be a plate-like structure, with one end connected to one end of the welding plate. The area of ​​the connecting portion 23 is larger than the area of ​​the welding plate to maximize the heat dissipation area. The second heat sinks 24 are connected to the edge of the connecting portion 23 and are perpendicular to the connecting portion 23, facilitating the installation of the heat sink 2 into the base 7.

[0053] The heat sink 2 is disposed inside the base 7, and the connecting part 23 is in contact with the bottom wall of the base 7. The connecting part 23 serves as the main heat dissipation part of the heat sink 2, and is disposed close to the bottom wall of the base 7 to improve heat dissipation efficiency.

[0054] Optionally, the projected area of ​​the connecting part 23 on the bottom wall of the base 7 is larger than the projected area of ​​the welding part 21 on the bottom wall of the base 7, and the connecting part 23 undertakes the main heat dissipation function.

[0055] Optionally, a third heat sink 25 is provided at the other end of the connecting portion 23. The third heat sink 25 is set at an angle to the connecting portion 23 and extends away from the connecting portion 23. The heat generated by the diode 1 during operation can be dissipated to the outside through the connecting portion 23, the third heat sink 25, the insulating adhesive 10, and the sidewall of the base 7, further improving the heat dissipation performance of the photovoltaic junction box. The third heat sink 25 can be connected to the edge of the connecting portion 23 and is perpendicular to the connecting portion 23 to facilitate the installation of the heat sink 2 into the base 7.

[0056] like Figure 2 , Figure 3 , Figure 5 and Figure 10 As shown, the photovoltaic junction box also includes a cable connector 5. One end of the cable connector 5 is positioned between the soldering part 21 and the pin of the diode 1. The cable connector 5 is soldered to both the soldering part 21 and the pin of the diode 1. The other end of the cable connector 5 is electrically connected to a cable 6. The cable 6 is used to connect to an external circuit of the photovoltaic junction box, thereby realizing the connection between the photovoltaic junction box and the external circuit. The cable 6 can be soldered to the other end of the cable connector 5 by resistance soldering or tin soldering.

[0057] One end of the cable connector 5 has multiple spaced connecting plates 511. The connecting plates 511 are positioned between the soldering part 21 and the pins of the diode 1. After the solder melts, it can fill the groove 211 and the space between the connecting plates 511 and the pins of the diode 1, improving the reliability of the connection between the soldering part 21, the connecting plates 511, and the pins of the diode 1. Optionally, the connecting plates 511 are inserted into the groove 211 of the soldering part 21.

[0058] See also Figure 10 As shown, the groove 211 can be divided into two types. The inner diameter of the groove 211 of one type is larger than that of the groove 211 of the other type. The groove 211 with the larger inner diameter matches the size of the connecting plate 511.

[0059] like Figure 11As shown, the cable connector 5 includes a first plate portion 51, a second plate portion 52, and a third plate portion 53 connected in sequence. The first plate portion 51 consists of multiple connecting plates 511, and is positioned between the soldering portion 21 and the pin of the diode 1. The second plate portion 52 is positioned higher than the first plate portion 51, and the third plate portion 53 is positioned higher than the second plate portion 52. The third plate portion 53 is electrically connected to the cable 6. The first plate portion 51 and the third plate portion 53 are at different heights to facilitate the connection between the cable connector 5 and the soldering plate and the cable 6. A protruding ridge is provided on the side of the third plate portion 53 where it connects to the cable 6 to improve the stability of the connection between the cable 6 and the third plate portion 53. The first plate portion 51, the second plate portion 52, and the third plate portion 53 are integrally connected structures, formed by a stamping process to create the first plate portion 51, the second plate portion 52, and the third plate portion 53 with different heights.

[0060] See Figure 1 As shown, cable 6 passes through the side wall of base 7. One end of cable 6 is placed inside base 7 and connected to cable connector 5, while the other end of cable 6 is placed outside base 7 for connection to external circuitry. The side wall of base 7 has an opening for cable 6 to pass through. A wire clamp 9 is also connected to base 7. The wire clamp 9 connects to the outer wall of base 7 to cooperate with base 7 in fixing cable 6 to base 7, preventing cable 6 from being dragged and detached from cable connector 5.

[0061] There are three types of photovoltaic junction boxes: positive terminal junction box, intermediate terminal junction box, and negative terminal junction box.

[0062] like Figure 12 As shown, for the intermediate-level junction box, no cable 6 needs to be installed in the junction box. In order to improve the heat dissipation performance of the junction box, both heat dissipation components 2 inside the junction box include a first heat dissipation plate 22, a second heat dissipation plate 24 and a third heat dissipation plate 25.

[0063] Figure 1 This is an exploded view of the positive terminal box. Figure 13 This is an exploded view of the negative terminal box, such as... Figure 1 and Figure 13 As shown, for the positive terminal junction box and the negative terminal junction box, the junction box needs to be equipped with cable 6. One of the heat sinks 2 inside the junction box includes a first heat sink 22, a second heat sink 24 and a third heat sink 25 to improve the heat dissipation performance of the junction box. The other heat sink 2 includes a first heat sink 22 and a second heat sink 24. The third heat sink 25 is not provided at the end of the connecting part 23 opposite to the welding part 21. One end of the cable connector 5 is inserted between the welding part 21 and the pin of the diode 1 through the connecting part 23, which plays a role in avoiding the placement of the cable connector 5.

[0064] The heat sink 2 mentioned above is made of a thermally conductive material to improve heat dissipation efficiency. In this invention, the heat sink 2 only serves to dissipate heat and support the pins of diode 1, and does not conduct electricity. Therefore, the heat sink 2 can be made of copper, steel, aluminum, or other materials with good heat dissipation performance. Compared to copper, these materials are less expensive, thus reducing the production cost of the photovoltaic junction box. The cable connector 5 enables the conductive connection between the cable 6 and the pins of diode 1; therefore, the cable connector 5 is made of copper.

[0065] The heat sink 2 is an integrally formed structure, which is usually formed by stamping process to form an integrally connected welded part 21, connecting part 23, first heat sink 22 and second heat sink 24, or to form an integrally connected welded part 21, connecting part 23, first heat sink 22, second heat sink 24 and third heat sink 25.

[0066] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A photovoltaic junction box, characterized in that, include: Diode (1); Heat sink (2), the heat sink (2) includes a welding part (21), the pins of the diode (1) are welded to the welding part (21), and a busbar welding surface (3) for welding to the busbar (4) is formed on the surface of the pins of the diode (1).

2. The photovoltaic junction box according to claim 1, characterized in that, The welding part (21) includes a welding plate, and the pins of the diode (1) are welded to the surface of the welding plate.

3. The photovoltaic junction box according to claim 2, characterized in that, The welding plate has a plurality of grooves (211) spaced apart on one side surface for welding to the pins of the diode (1).

4. The photovoltaic junction box according to claim 1, characterized in that, The welding part (21) is provided with a first heat sink (22) on both sides opposite to each other. The first heat sink (22) extends toward the side away from the welding surface of the welding part (21) and the pin welding surface of the diode (1).

5. The photovoltaic junction box according to claim 4, characterized in that, The heat sink (2) also includes a connecting part (23), one end of which is connected to one end of the welding part (21). A second heat sink (24) is provided on both sides of the connecting part (23). The second heat sink (24) is set at an angle to the connecting part (23), and the second heat sink (24) extends away from the connecting part (23).

6. The photovoltaic junction box according to claim 5, characterized in that, The photovoltaic junction box also includes a base (7), the heat sink (2) is disposed inside the base (7), and the connecting part (23) is attached to the bottom wall of the base (7); And / or, the projected area of ​​the connecting part (23) on the bottom wall of the base (7) is greater than the projected area of ​​the welding part (21) on the bottom wall of the base (7).

7. The photovoltaic junction box according to claim 5, characterized in that, The other end of the connecting part (23) is provided with a third heat sink (25), which is set at an angle to the connecting part (23) and extends away from the connecting part (23).

8. The photovoltaic junction box according to claim 1, characterized in that, The photovoltaic junction box also includes a cable connector (5), one end of which is placed between the welding part (21) and the pin of the diode (1), and the cable connector (5) is welded to the welding part (21) and the pin of the diode (1) respectively; the other end of the cable connector (5) is electrically connected to a cable (6).

9. The photovoltaic junction box according to claim 8, characterized in that, One end of the cable connector (5) is a plurality of spaced connecting plates (511), which are placed between the welding part (21) and the pin of the diode (1).

10. The photovoltaic junction box according to claim 9, characterized in that, The cable connector (5) includes a first plate (51), a second plate (52), and a third plate (53) connected in sequence. The first plate (51) is a plurality of connecting plates (511). The first plate (51) is disposed between the welding part (21) and the pin of the diode (1). The second plate (52) is disposed above the first plate (51). The third plate (53) is disposed above the second plate (52). The third plate (53) is electrically connected to the cable (6).

11. The photovoltaic junction box according to any one of claims 1-10, characterized in that, The photovoltaic junction box also includes a base (7), the diode (1) and the heat sink (2) are disposed in the base (7), the bottom of the base (7) is provided with a through hole, the through hole is used for the busbar (4) to pass through and to be welded to the welding surface (3) of the busbar, and the base (7) is filled with insulating glue (10).

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