CN218070219U - Photovoltaic connector, junction box and photovoltaic module - Google Patents

Abstract

The utility model provides a photovoltaic connector, terminal box and photovoltaic module, the photovoltaic connector includes plug and socket of mutual grafting cooperation, the plug includes grafting portion, the socket includes butt joint portion, butt joint portion has the chamber of acceping that is used for accepting the grafting portion, the photovoltaic connector still includes the first protective sheath that is fixed in on the plug, is fixed in the second protective sheath on the socket; after the socket and the plug are assembled, at least parts of the first protective sleeve and the second protective sleeve are overlapped with each other and are connected by hot melting. The utility model discloses a protective sheath in the outside of photovoltaic connector's butt joint portion adopts the hot melt to connect and has dual protection effect, promotes photovoltaic connector's fastness, leakproofness, avoids appearing because of the photovoltaic connector's that contact failure between grafting portion and the butt joint portion leads to inefficacy problem, effectively promotes photovoltaic connector's security, and photovoltaic connector's simple structure, spare part are few, reduction in production cost.

Description

Photovoltaic connector, junction box and photovoltaic module

Technical Field

The utility model relates to a photovoltaic technology field especially relates to a photovoltaic connector, terminal box and photovoltaic module.

Background

The connector on the junction box of the photovoltaic module belongs to an electric connection part, if the quality of the connector is not over-critical, the connector is a huge potential safety hazard, a fire disaster can be caused seriously, and huge loss is brought to a photovoltaic power station.

The main reasons for fire occurring due to the connector are: the increased resistance of the connector during operation of the photovoltaic power plant results in the temperature of the connector exceeding the temperature range that the plastic housing and metal parts can withstand.

The resistance of the connector is increased due to contact failure and mechanical failure, wherein the contact failure is mainly caused by the fact that the contact resistance of the male end and the female end of the connector is increased due to poor contact; mechanical failures include: the torsion is not enough during the assembly, and the nut is not screwed down, so that the lead is relatively displaced with the connector when being subjected to external force, and the contact resistance is increased when the lead is severe.

Another important cause of fire in connectors is insulation failure of the connector, such as: the lack of tightening of the nut, the lack of in-place installation of the seal ring, injection molding defects, and connector cracking can all lead to insulation failure of the connector.

In view of the above, there is a need to design a new photovoltaic connector, junction box and photovoltaic module to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a new photovoltaic connector, terminal box and photovoltaic module solve one of the above-mentioned problems.

In order to achieve the above object, the present invention provides the following technical solutions:

a photovoltaic connector comprises a plug and a socket which are mutually spliced and matched, wherein the plug comprises a splicing part, the socket comprises a butting part, the butting part is provided with a containing cavity for containing the splicing part, and the photovoltaic connector further comprises a first protective sleeve fixed on the plug and a second protective sleeve fixed on the socket; wherein, socket and plug are pegged graft the cooperation back, and first protective sheath and second protective sheath are at least partly overlapped each other and both adopt hot melt to connect.

Furthermore, the plug also comprises a negative cable connected to the plugging part, and the socket also comprises a positive cable connected to the butting part; the first protective sleeve and the second protective sleeve are both strip-shaped pipe sleeves, and the lengths of the first protective sleeve and the second protective sleeve are both greater than the lengths of the insertion part and the butt joint part.

Further, the first protective sleeve is sleeved on the insertion part and the negative cable, and the insertion part is completely accommodated in the first protective sleeve; one end of the first protective sleeve is connected with the negative cable in a hot melting mode, and the other end of the first protective sleeve is connected with the second protective sleeve in a hot melting mode.

Further, the second protective sleeve is sleeved on the butt joint part and the positive cable, and the butt joint part is completely contained in the second protective sleeve; one end of the second protective sleeve is connected with the positive cable in a hot melting mode, and the other end of the second protective sleeve is connected with the first protective sleeve in a hot melting mode.

Further, the inner diameter of the second protective sleeve is larger than the outer diameter of the first protective sleeve, and the second protective sleeve is wound on the outer side of the first protective sleeve.

Further, the inner diameter of the first protection sleeve is larger than the outer diameter of the second protection sleeve, and the first protection sleeve is wound on the outer side of the second protection sleeve.

Furthermore, the first protective sleeve and the second protective sleeve are both heat shrinkable tubes, and each heat shrinkable tube comprises a thermoplastic layer and a flame retardant layer positioned on the outer side of the thermoplastic layer.

Further, the thickness dimension of the thermoplastic layer along the radial direction is more than 0.7mm, and the thickness dimension of the flame-retardant layer along the radial direction is more than 0.8mm.

Furthermore, the photovoltaic connector further comprises a positioning groove arranged outside the inserting part and a stopping part arranged inside the butting part and matched with the positioning groove, the positioning groove is formed by inwards recessing the outer surface of the inserting part along the radial direction of the positioning groove, and the stopping part is formed by protruding the inner wall of the accommodating cavity.

The utility model also provides a photovoltaic connector, locate the protective sheath on cable and the butt joint portion including butt joint portion, the cable that links to each other with butt joint portion, cover, butt joint portion accept completely in the protective sheath, the protective sheath is a rectangular shape pipe box, its one end with the cable hot melt is connected, and the other end is used for being connected with a butt joint component hot melt.

Further, the protective sleeve is a heat shrinkable tube and comprises a thermoplastic layer and a flame retardant layer positioned outside the thermoplastic layer.

The thickness dimension of the thermoplastic layer along the radial direction is more than 0.7mm, and the thickness dimension of the flame-retardant layer along the radial direction is more than 0.8mm.

The utility model also provides a terminal box, the terminal box includes foretell photovoltaic connector.

The utility model also provides a photovoltaic module, photovoltaic module includes foretell terminal box.

Compared with the prior art, the utility model discloses a photovoltaic connector's beneficial effect lies in: the utility model discloses a photovoltaic connector utilizes first protective sheath and second protective sheath and adopts the mode of hot melt connection to replace conventional shell structure, is the stack design of first protective sheath and second protective sheath in the outside of butt joint portion, promotes grafting portion and butt joint portion complex fastness, leakproofness, avoids appearing the problem of the photovoltaic connector inefficacy that leads to because of the contact failure between grafting portion and the butt joint portion, effectively promotes the security of photovoltaic connector, moreover, the utility model discloses a photovoltaic connector's simple structure, spare part is few, convenient operation, facilitate promotion.

Drawings

Fig. 1 is a schematic cross-sectional structural diagram of a photovoltaic connector according to an embodiment of the present invention.

Fig. 2 is an exploded view of a cross-sectional structure of the socket and the plug in the embodiment of fig. 1.

Fig. 3 is an enlarged view of a portion a of fig. 1.

Fig. 4 is a schematic view of an assembly process of the photovoltaic connector in the embodiment of fig. 1.

Fig. 5 is a schematic cross-sectional structural view of a photovoltaic connector according to another embodiment of the present invention.

Fig. 6 is a schematic view of the structure of the photovoltaic connector of the present invention.

The cable comprises a plug 10, a plug 11, a plugging part 12, a negative cable 13, a positioning groove 20, a socket 21, a butt joint part 22, a positive cable 23, a containing cavity 24, a stop part 31, a first protective sleeve 32, a second protective sleeve 33, a sealing part 34, a thermoplastic layer 35, a flame-retardant layer 41, a protective sleeve 42 and a cable.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the directions or positional relationships indicated in the present invention are based on the directions or positional relationships shown in the attached drawings, and are only for the convenience of simplifying the description of the present invention, and the indication or suggestion that the indicated device must have a specific direction, be constructed and operated in a specific direction is not understood as the limitation of the scope of the present invention.

In the various drawings of the present invention, certain dimensions of structures or portions may be exaggerated in relation to other structures in part for ease of illustration, and thus, are used only to illustrate the basic structure of the subject matter of the present invention.

A photovoltaic connector, as shown in fig. 1 to 5, including a plug 10 and a socket 20 that are mated with each other, where the plug 10 includes a mating portion 11, the socket 20 includes a mating portion 21, the mating portion 21 has a receiving cavity 23 for receiving the mating portion 11, the photovoltaic connector further includes a first protective sleeve 31 fixed on the plug 10, and a second protective sleeve 32 fixed on the socket 20; after the socket 20 is assembled with the plug 10, the first protective sleeve 31 and the second protective sleeve 32 are at least partially overlapped with each other and are connected by heat fusion.

The utility model discloses a photovoltaic connector utilizes the mode that first protective sheath 31 and second protective sheath 32 adopt the hot melt to connect to replace the casing design of conventional structure, and, the stack design of first protective sheath 31 and second protective sheath 32 in the butt joint portion 21 outside for the outside of butt joint portion 21 has dual protection effect, promotes photovoltaic connector's fastness, leakproofness, avoids appearing because of the photovoltaic connector's that contact failure between grafting portion 11 and the butt joint portion 21 leads to inefficacy problem, effectively promotes photovoltaic connector's security.

Further, as shown in fig. 2 and fig. 3, the photovoltaic connector further includes a positioning groove 13 disposed outside the inserting portion 11, and a stopping portion 24 disposed inside the abutting portion 21 and engaged with the positioning groove 13, the positioning groove 13 is formed by radially inwardly recessing the outer surface of the inserting portion 11, the stopping portion 24 is formed by protruding from the inner wall of the accommodating cavity 23, when the inserting portion 11 is inserted into the accommodating cavity 23, the stopping portion 24 slides into the positioning groove 13, so as to prevent the inserting portion 11 from falling off from the positioning groove 13, and improve the structural strength of the photovoltaic connector.

It can be understood that the present invention is not limited to the shape of the stopping portion 24, and the stopping portion can be extended into the accommodating cavity 23 to cooperate with the positioning groove 13 to limit the stopping position.

Further, the plug 10 further includes a negative cable 12 connected to the insertion portion 11, the socket 20 further includes a positive cable 22 connected to the docking portion 21, the first protective sleeve 31 and the second protective sleeve 32 are both strip-shaped sleeves, and the lengths of the first protective sleeve 31 and the second protective sleeve 32 are both greater than the lengths of the insertion portion 11 and the docking portion 12, that is, one end of the first protective sleeve 31 is in hot-melt connection with the negative cable 12, so that a certain distance is formed at a connection position of the first protective sleeve 31 and the insertion portion 11, or at a joint of the first protective sleeve 31 and the insertion portion and the docking portion; correspondingly, one end of the second protective sleeve 32 is connected with the positive cable 22 in a hot melting manner, so that a certain distance is reserved at the joint of the second protective sleeve 32 and the butting part 21 or at the joint of the second protective sleeve 32 and the plugging part 11 and the butting part 21, on one hand, the bonding area between the first protective sleeve 31 and the plug 10 and between the second protective sleeve 32 and the socket 20 is increased, and the structural strength of the photovoltaic connector is increased; on the other hand, increase the route of photovoltaic connector steam invasion promotes photovoltaic connector's waterproof performance.

Specifically, the first protection sleeve 31 is sleeved on the insertion part 11 and the negative cable 12, and the insertion part 11 is completely accommodated in the first protection sleeve 31; one end of the first protective sleeve 31 is connected with the negative cable 12 in a hot melting mode, and the other end of the first protective sleeve 31 is connected with the second protective sleeve 32 in a hot melting mode. Correspondingly, the second protective sleeve 32 is sleeved on the abutting portion 21 and the positive cable 22, and the abutting portion 21 is completely accommodated in the second protective sleeve 32; one end of the second protective sleeve 32 is connected with the positive cable 22 in a hot melting mode, and the other end of the second protective sleeve is connected with the first protective sleeve 31 in a hot melting mode. So that the first protective sheath 31 and the second protective sheath 32 are overlapped outside the abutting portion 21.

As a preferred embodiment of the present invention, as shown in fig. 1 to fig. 3, the inner diameter of the second protecting sleeve 32 is greater than the outer diameter of the first protecting sleeve 31, after the plug 10 and the socket 20 are assembled, the second protecting sleeve 32 is disposed outside the first protecting sleeve 31, and both ends of the second protecting sleeve extend to the positive cable 22 and the negative cable 12, respectively, one end of the first protecting sleeve 31, which is far away from the negative cable 12, extends to the joint of the butt-joint portion 21 and the positive cable 22, on the one hand, the bonding strength of the plug 10 and the socket 20 can be improved, and on the other hand, the path of the water vapor intrusion can be increased, and the waterproof performance of the photovoltaic connection can be increased.

In this embodiment, as shown in fig. 4, the assembling method of the plug 10 and the socket 20 includes: firstly, the first protection sleeve 31 is sleeved on the plug 10, two ends of the first protection sleeve 31 are subjected to thermal shrinkage pretreatment, so that one end of the first protection sleeve 31 is fixed on the negative cable 12, the other end of the first protection sleeve 31 forms a closed part 33, similarly, the second protection sleeve 32 is sleeved on the socket 20, two ends of the second protection sleeve 32 are subjected to thermal shrinkage pretreatment, one end of the second protection sleeve 32 is fixed on the positive cable 22, the other end of the second protection sleeve 32 forms a closed part 33, the closed parts 33 are respectively removed, the plug 10 is plugged on the socket 20, the plugging part 11 is inserted into the accommodating cavity 23, the stopping part 24 slides into the positioning groove 13, the first protection sleeve 31 is positioned outside the butting part 21, the second protection sleeve 32 is positioned outside the first protection sleeve 31, a middle area between the second protection sleeve 32 and the first protection sleeve 31 is subjected to thermal shrinkage, and the photovoltaic assembly connector is completed.

As a preferred embodiment of the present invention, as shown in fig. 5, the inner diameter of the first protecting sleeve 31 is larger than the outer diameter of the second protecting sleeve 32, the first protecting sleeve 31 is wound around the outside of the second protecting sleeve 32, and both ends of the first protecting sleeve 31 extend to the positive cable 22 and the negative cable 12 respectively. One end of the second protective sleeve 32 far away from the positive cable 22 extends to the joint of the plug part 11 and the butt joint part 21, so that the operation process is simple, the work flow is saved, and the production efficiency is improved.

In this embodiment, as shown in fig. 4, the assembling method of the plug 10 and the socket 20 includes: firstly, the first protective sleeve 31 is sleeved on the socket 20, two ends of the first protective sleeve 31 are subjected to thermal shrinkage pretreatment, so that one end of the first protective sleeve 31 is fixed on the positive cable 22, the other end of the first protective sleeve forms a closed part 33, similarly, the second protective sleeve 32 is sleeved on the plug 10, two ends of the second protective sleeve 32 are subjected to thermal shrinkage pretreatment, one end of the second protective sleeve 32 is fixed on the negative cable 12, the other end of the second protective sleeve forms a closed part 33, the closed parts 33 are respectively removed, the plug 10 is plugged on the socket 20, the plugging part 11 is inserted into the accommodating cavity 23, the stopping part 24 slides into the positioning groove 13, the first protective sleeve 31 and the butting part 21 are plugged in a space between the plugging part 11 and the second protective sleeve 32, the middle area of the second protective sleeve 32 and the first protective sleeve 31 is subjected to thermal shrinkage in the direction from the plug 10 to the socket 20, and the photovoltaic connector is assembled.

Further, the first protection sleeve 31 and the second protection sleeve 32 are both heat shrinkable tubes, and the heat shrinkable tubes have a property of shrinking when heated, so that the first protection sleeve 31 and the second protection sleeve 32 can be fixed on the outer side of the socket 20 or the plug 10 after being subjected to heat shrinking and heating treatment in the process of inserting and assembling the plug 10 and the socket 20, and further, the firmness and the sealing performance of the inserting and matching between the inserting part 11 and the butting part 21 can be effectively protected.

Further, the first protective sheath 31 and the second protective sheath 32 each include a thermoplastic layer 34 and a flame retardant layer 35 located outside the thermoplastic layer 34, wherein the thermoplastic layer 34 is a high molecular polymer hot melt adhesive layer, and after heating, the first protective sheath 31 or the second protective sheath 32 can be bonded outside the plug 10 or the socket 20 through the thermoplastic layer 34, for example, the high molecular polymer hot melt adhesive layer is made of polyimide, which has excellent heat resistance, oxidation resistance, mechanical properties and insulating properties, and improves the waterproof, dustproof and weather-resistant properties of the photovoltaic connector. The flame-retardant layer 35 is a halogen-free low-smoke polyolefin layer, and the halogen-free low-smoke polyolefin has excellent flame retardant property so as to ensure the fireproof capability of the photovoltaic connector.

In this embodiment, first protective sheath 31 and second protective sheath 32 adopt the combination of thermoplastic layer 34 and fire-retardant layer 35, promote the weather resistance performance, waterproof and the fire-proof performance of photovoltaic connector, and then guarantee the security performance of photovoltaic connector when normally working in photovoltaic system.

Further, the thickness dimension of the thermoplastic layer 34 in the radial direction thereof is greater than 0.7mm, the thickness dimension of the flame retardant layer 35 in the radial direction thereof is greater than 0.8mm, and the thickness of the thermoplastic layer 34 and the flame retardant layer 35 are suitable for meeting the requirement that the photovoltaic connector has certain strength, so that the plug part 11 and the butt part 21 are protected from being crushed or abraded, and the service life of the photovoltaic connector is prolonged.

The utility model also provides a photovoltaic connector, locate cable 42 and the protective sheath 41 on the 21 of butt joint portion including butt joint portion 21, the cable 42 that links to each other with butt joint portion 21, cover, butt joint portion 21 accept completely in the protective sheath 41, protective sheath 41 is a rectangular shape pipe box, its one end with cable 42 hot melt is connected, and the other end is used for being connected with a butt joint component hot melt. The utility model discloses a mode that photovoltaic connector passes through the hot melt to be connected fixes protective sheath 41 in the outside of cable 42 and butt joint portion 21, promotes photovoltaic connector's sealing performance and structural strength, and photovoltaic connector's simple structure, and spare part is few, reduction in production cost.

It is understood that the docking element cooperating with the photovoltaic connector may be: the plug part 11, the cable 42 and the other protective sleeve 41 which are in plug-in fit with the butt-joint part 21 form another photovoltaic connector, then, the other end of the protective sleeve 41 is connected to the other protective sleeve 41 in a hot melting manner, and the outer side of the butt-joint part 21 is designed by overlapping the double-layer protective sleeve 41, so that the bonding strength and the sealing performance of the photovoltaic connector can be effectively improved.

The docking element may also be another photovoltaic connector formed by the plug part 11 and the cable 42 which are in plug fit with the docking part 21, and then, the other end of the protective sleeve 41 is connected to the cable 42 of the docking element by heat fusion, so that the protective sleeve 41 outside the docking part 21 is integrated, the structure is simple, and the cost is reduced.

Further, protective sheath 41 is the pyrocondensation pipe, through the mode of heating, connects protective sheath 41 hot melt in the outside of butt joint portion 21, and the process is simple, and spare part is few, reduces photovoltaic connector's manufacturing cost.

Further, the protective sleeves 41 each include a thermoplastic layer 34, and a flame retardant layer 35 located outside the thermoplastic layer 34. By combining the thermoplastic layer 34 and the flame-retardant layer 35, on one hand, the thermoplastic layer 34 is bonded on the plug 10 or the socket 20, and the sealing performance of the photovoltaic connector is improved, on the other hand, the fireproof performance of the photovoltaic connector is improved through the flame-retardant layer 35 on the outer side, and the safety of the photovoltaic connector in normal working in a photovoltaic system is further ensured.

Further, the thermoplastic layer 34 has a thickness dimension in the radial direction thereof of more than 0.7mm, and the flame retardant layer 35 has a thickness dimension in the radial direction thereof of more than 0.8mm. The thermoplastic layer 34 and the flame retardant layer 35 have appropriate thicknesses to satisfy the requirement that the photovoltaic connector has certain strength, so as to protect the plug part 11 and the butt joint part 21 from being crushed or abraded, and prolong the service life of the photovoltaic connector.

The utility model provides a terminal box (not shown in the drawings), the terminal box includes foretell photovoltaic connector, the terminal box includes box body (not shown in the drawings), locates terminal (not shown in the box body), the one end of butt joint portion 21 is kept away from to socket 20's anodal cable 22, perhaps plug 10's negative pole cable 12 is kept away from the one end of grafting portion 11 is connected respectively on the terminal that corresponds.

The utility model also provides a photovoltaic module (not shown), photovoltaic module includes the lamination piece (not shown), locates the terminal box at the lamination piece back, the end of drawing forth of the busbar of lamination piece inserts the box body after buckling and fixes on the terminal to derive the current of photovoltaic module conversion.

To sum up, the utility model discloses a photovoltaic connector utilizes first protective sheath 31 and second protective sheath 32 and adopts the mode that the hot melt is connected to replace conventional shell structure for the outside of butt joint portion 21 has the duplicate protection effect, promotes photovoltaic connector's fastness, leakproofness, avoids appearing because of grafting portion 11 and the photovoltaic connector's that contact failure between the butt joint portion 21 leads to the inefficacy problem, effectively promotes photovoltaic connector's security.

It should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be understood by those skilled in the art that the specification as a whole and the embodiments may be combined as appropriate to form other embodiments as would be understood by those skilled in the art.

The above detailed description of a series of embodiments is only for the purpose of illustration, and is not intended to limit the scope of the invention, which is intended to include all equivalent embodiments or modifications that do not depart from the spirit of the invention.

Claims (14)

1. The utility model provides a photovoltaic connector, is including mutual grafting complex plug and socket, the plug includes grafting portion, the socket includes butt joint portion, butt joint portion has and is used for acceping the chamber is acceped to grafting portion, its characterized in that: the photovoltaic connector further comprises a first protective sleeve fixed on the plug and a second protective sleeve fixed on the socket; after the socket is in plug-in fit with the plug, the first protective sleeve and the second protective sleeve are at least partially overlapped and are connected by hot melting.

2. The photovoltaic connector of claim 1, wherein: the plug also comprises a negative cable connected to the plug part, and the socket also comprises a positive cable connected to the butt joint part; the first protective sleeve and the second protective sleeve are both strip-shaped pipe sleeves, and the lengths of the first protective sleeve and the second protective sleeve are both greater than the lengths of the insertion part and the butt joint part.

3. The photovoltaic connector of claim 2, wherein: the first protective sleeve is sleeved on the plug-in part and the negative cable, and the plug-in part is completely contained in the first protective sleeve; one end of the first protective sleeve is connected with the negative cable in a hot melting mode, and the other end of the first protective sleeve is connected with the second protective sleeve in a hot melting mode.

4. The photovoltaic connector of claim 2, wherein: the second protective sleeve is sleeved on the butt joint part and the positive cable, and the butt joint part is completely contained in the second protective sleeve; one end of the second protective sleeve is connected with the positive cable in a hot melting mode, and the other end of the second protective sleeve is connected with the first protective sleeve in a hot melting mode.

5. The photovoltaic connector of any one of claims 1 to 4, wherein: the inner diameter of the second protective sleeve is larger than the outer diameter of the first protective sleeve, and the second protective sleeve is wound on the outer side of the first protective sleeve.

6. The photovoltaic connector of any one of claims 1 to 4, wherein: the inner diameter of the first protection sleeve is larger than the outer diameter of the second protection sleeve, and the first protection sleeve is wound on the outer side of the second protection sleeve.

7. The photovoltaic connector of any one of claims 1 to 4, wherein: the first protective sleeve and the second protective sleeve are both heat-shrinkable tubes, and each heat-shrinkable tube comprises a thermoplastic layer and a flame-retardant layer positioned on the outer side of the thermoplastic layer.

8. The photovoltaic connector of claim 7, wherein: the thickness dimension of the thermoplastic layer along the radial direction is larger than 0.7mm, and the thickness dimension of the flame-retardant layer along the radial direction is larger than 0.8mm.

9. The photovoltaic connector of any one of claims 1 to 4, wherein: the photovoltaic connector further comprises a positioning groove arranged outside the inserting part and a stopping part arranged inside the butt joint part and matched with the positioning groove, the positioning groove is formed by inwards recessing the outer surface of the inserting part along the radial direction of the positioning groove, and the stopping part is formed by extending and extending from the inner wall of the accommodating cavity.

10. The utility model provides a photovoltaic connector, includes butt joint portion, the cable that links to each other with butt joint portion, the protective sheath on cable and butt joint portion is located to the cover, its characterized in that: the butt joint part is completely accommodated in the protective sleeve, the protective sleeve is a strip-shaped pipe sleeve, one end of the protective sleeve is in hot melt connection with the cable, and the other end of the protective sleeve is in hot melt connection with a butt joint element.

11. The photovoltaic connector of claim 10, wherein: the protective sleeve is a heat shrinkable tube and comprises a thermoplastic layer and a flame-retardant layer positioned on the outer side of the thermoplastic layer.

12. The photovoltaic connector of claim 11, wherein: the thickness dimension of the thermoplastic layer along the radial direction is larger than 0.7mm, and the thickness dimension of the flame-retardant layer along the radial direction is larger than 0.8mm.

13. A terminal block, characterized by: the junction box comprises the photovoltaic connector of any one of claims 1 to 12.

14. A photovoltaic module comprising the junction box of claim 13.

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