WO2017185886A1

WO2017185886A1 - Junction box

Info

Publication number: WO2017185886A1
Application number: PCT/CN2017/076417
Authority: WO
Inventors: 罗宇浩
Original assignee: 浙江昱能科技有限公司
Priority date: 2016-04-25
Filing date: 2017-03-13
Publication date: 2017-11-02
Also published as: CN105790703A

Abstract

A junction box (300, 400), comprising a box body (301, 401, 500) and a box cover (303, 403, 600). The box body comprises a box body housing (501), a welding band fixing terminal (507) and a first output terminal (509) provided in the box body housing; the welding band fixing terminal and the first output terminal are electrically connected, a hole (511) is opened on the box body housing; a first lead welding band and a second lead welding band on two ends of a battery string pass through the hole and are electrically connected to the welding band fixing terminal; the box cover comprises an upper cover housing (601) and a circuit board (603) provided on the upper cover housing, the upper cover housing is provided with an output cable (607), the circuit board is provided with an input terminal (609) and a second output terminal, the second output terminal being electrically connected to the output cable; the box body and the box cover can be buckled and fixed together, so as to allow the first output terminal of the box body and the input terminal of the circuit board to be electrically connected. According to the junction box, by means of switching the box covers having different circuit boards, different circuit board functions can be easily achieved.

Description

Junction box

Technical field

The invention relates to the technical field of photovoltaic accessories, in particular to a junction box.

Background technique

Solar photovoltaic modules are a core part of solar power systems and the most important part of solar power systems. The role of solar photovoltaic modules is to convert solar energy into electrical energy and send it to a battery for storage or to drive the load.

A single solar photovoltaic module in the prior art has a junction box for connecting the output of a series cell laminated to a solar panel to a cable. This junction box is usually mounted on the back of the PV module and has two DC output cables. 1 is a simplified schematic diagram of a prior art photovoltaic module. As shown, the photovoltaic assembly 100 includes a photovoltaic panel 101 and a junction box 103. An output lead 105 is disposed on the junction box 103, and a connector 107 is disposed on the output lead 105. The joint 107 typically includes a male and a female, and the two can be mated. In general, the junction box is connected to the ribbon exported by the photovoltaic panel. A bypass diode is also arranged in the junction box to skip the series of cells through the bypass diode when some series cells are not working properly to avoid other Damage to components.

2 is a simplified schematic view of a prior art junction box. As shown, the junction box 200 includes a lower case housing 201, a bypass diode 203, a tape fixing terminal 205, a wire bonding tape 205, an output cable fixing terminal 207, an output cable 209, and an upper cover 211. The bottom surface of the lower case 201 is glued to the photovoltaic board, and the lower case 201 has an opening for penetrating the wire strip of the photovoltaic board into the lower case 201, the fixed strip of the strip 205 and the fixed end of the output lead 207 is connected together. The lower case housing 201 and the upper cover 211 are fitted and fixed.

There are also cases where electronic devices are added to the junction box for component performance monitoring, communication, security protection, and theft prevention. These devices are equipped with different electronic devices in the junction box to achieve different functions. They are fixed when the components are made, cannot be changed, and are difficult to replace once damaged.

Summary of the invention

The technical problem to be solved by the present invention is to provide a junction box which can easily realize different circuit board functions and is easy to replace.

In order to solve the above technical problem, the present invention provides a junction box suitable for a photovoltaic module, the photovoltaic module comprising a photovoltaic panel and a battery string, the junction box comprising:

a casing comprising a casing casing and a ribbon fixing terminal and a first output terminal disposed in the casing casing, the ribbon fixing terminal and the first output terminal being electrically connected, and the casing shell is opened a first wire ribbon and a second wire ribbon at both ends of the battery string pass through the hole and are electrically connected to the solder ribbon fixing terminal;

a cover comprising an upper cover housing and a circuit board disposed in the upper cover housing, the upper cover housing being provided with an output cable, the circuit board having an input terminal and a second output terminal, the second output terminal and The output cable is electrically connected;

The box body and the cover cover can be fastened and fixed, so that the first output terminal of the box body and the input terminal of the circuit board are electrically connected.

According to an embodiment of the invention, the cell string comprises N substrings in series, and N≥2, N-1 wire strips are connected between adjacent substrings, the box has N +1 solder ribbon fixed terminal and N+1 first output terminals; the casing further includes a bypass diode group connected in series with N bypass diodes, and N+1 said solder ribbon fixed terminals are electrically connected at intervals The strip fixing terminals at both ends of the bypass diode group are respectively connected to the first and second lead ribbons at N ends of the bypass diodes; wherein the N-1 a wire bonding tape is passed through the hole and respectively connected to the tape fixing terminal, except for the tape fixing terminal at both ends of the bypass diode group; the input terminals of the cover are two when When the box body is fastened to the cover, the input terminal is electrically connected to the first output terminals of the two ends of the bypass diode group.

According to an embodiment of the invention, the cell string comprises N substrings in series, and N≥2, N-1 wire strips are connected between adjacent substrings, the box has N +1 strip fixed terminal and N+1 first output terminals; said N-1 lead strips pass through said holes and respectively access N-1 said strip fixed terminals; said circuit board a bypass diode group including a series of N bypass diodes, wherein the input terminals of the circuit board are N+1, and the N+1 input terminals are electrically connected at opposite ends of the N bypass diodes. When the box is fastened to the cover, N+1 of the input terminals are electrically connected to the N+1 first output terminals.

According to an embodiment of the invention, the circuit board includes one or more of a circuit module, a communication circuit module, a protection circuit module, a maximum power point tracking circuit module, and an inverter circuit module that monitor the photovoltaic component.

According to an embodiment of the invention, the circuit board is a DC circuit board or an AC circuit board.

According to an embodiment of the present invention, the cover further includes an upper cover inner liner, the upper cover inner liner sealingly engaging the upper cover outer casing, and the circuit board is closed on the upper cover outer casing and the upper cover Cover between the linings.

According to an embodiment of the invention, the upper cover lining is provided with a first through hole, and the input terminal of the circuit board is electrically connected to the first output terminal through the through hole.

According to an embodiment of the invention, the casing casing is suitably affixed to the photovoltaic panel.

According to an embodiment of the invention, a seal ring is provided around the inner periphery of the casing casing and/or the upper casing.

According to an embodiment of the invention, the casing body and/or the upper cover casing are provided with buckles, so that the casing and the cover can be fastened and fixed.

According to an embodiment of the present invention, the first output terminal includes a base and an arc spring piece fixed on the base, and when the box body is fastened to the cover, the input terminal and the seat are The curved spring piece is tightly pressed.

According to an embodiment of the invention, the solder ribbon fixing terminal defines a second through hole for mounting the bypass diode.

According to an embodiment of the invention, the first output terminal and the input terminal are mated.

The invention provides a new multifunctional photovoltaic module junction box, which can easily realize different circuit board functions by replacing the cover with different circuit boards, and is easy to replace, and the junction box greatly improves the function and maintenance of the photovoltaic module. Performance increases the value of PV modules.

BRIEF abstract

Features and capabilities of the present invention are further described by the following examples and the accompanying drawings.

1 is a simplified schematic diagram of a prior art photovoltaic module.

2 is a simplified schematic view of a prior art junction box.

Figure 3 is a schematic perspective view of one embodiment of the present invention.

Figure 4 is a simplified schematic diagram of one embodiment of the present invention.

Figure 5 is a schematic view showing the structure of a casing according to an embodiment of the present invention.

Figure 6 is a schematic view showing the structure of a lid of an embodiment of the present invention.

Figure 7 is a schematic view showing the structure of a first output terminal and a tape fixing terminal according to an embodiment of the present invention.

Figure 8 is a simplified cross-sectional view of one embodiment of the present invention.

Preferred embodiment of the invention

Embodiments of the present invention will now be described in detail with reference to the drawings. Wherever possible, the same reference numerals reference Further, although the terms used in the present invention are selected from well-known public terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant according to his or her judgment, and the detailed meaning thereof is herein. The description of the relevant part of the description. Furthermore, it is intended that the present invention be understood not only by the actual terms used, but also by the meaning of each term.

Figure 3 is a schematic perspective view of one embodiment of the present invention. As shown, a junction box 300 suitable for use in a photovoltaic module includes a case 301 and a cover 303 with an output cable 305.

Figure 4 is a simplified schematic diagram of one embodiment of the present invention. As shown, a junction box 400 suitable for a photovoltaic module includes a case 401 and a cover 403, and the case 401 and the cover 403 can be fastened to each other. Conventionally, photovoltaic modules have photovoltaic panels and cell strings (not shown). The casing 401 is suitably fixed to the surface of the photovoltaic panel.

Figure 5 is a schematic view showing the structure of a casing according to an embodiment of the present invention. Referring to FIG. 5, the casing 500 includes a casing casing 501, and a tape fixing terminal 507 and a first output terminal 509 electrically connected to each other. A hole 511 is defined in the casing 500. The first and second wire strips at both ends of the cell string of the photovoltaic module pass through the hole 511 (not shown) and are electrically connected to the tape fixing terminal 507. That is, the first and second wire bonding strips and the first output terminal 509 are electrically connected to each other by the solder ribbon fixing terminal 507.

Figure 6 is a schematic view showing the structure of a lid of an embodiment of the present invention. As shown, the cover 600 includes an upper cover housing 601 and a circuit board 603 disposed in the upper cover housing 601. An output cable 607 is disposed on the upper cover casing 601. The circuit board 603 has an input terminal 609 and a second output terminal (not shown), and the second output terminal and the output cable 607 are electrically connected. Referring to FIGS. 2 and 3, when the case 500 and the cover 600 are fastened to each other, the first output terminal 509 of the case and the input terminal 609 of the circuit board 603 are electrically connected.

Specifically, the circuit board 603 may be a circuit board having a direct current function or a circuit board having an alternating current function. Among them, the DC circuit board indicates that the output is DC, and the AC circuit board indicates that the output is AC.

The circuit board 603 can be a circuit module for monitoring a photovoltaic component, a communication circuit module, a protection circuit module, One or more of the maximum power point tracking circuit module and the inverter circuit module. For example, the circuit module for monitoring the photovoltaic module is capable of detecting the voltage and current of the photovoltaic module; the communication module can transmit the monitored related data to a designated data center for storage and analysis; and the protection circuit module can be a protection circuit with an arc prevention function. The module shuts down the entire circuit when the arc occurs, so that the output voltage of the junction box 500 is almost zero to ensure the safety of the photovoltaic module system; the maximum power point tracking circuit module can operate the junction box at the maximum power point to provide the photovoltaic module The amount of electricity generated by the system. It can be understood that the circuit board 603 can also be a circuit module with a tracking function, and the present invention does not have such a limitation. For example, the circuit board 603 may have a GPS positioning device that enables tracking of the junction box or the photovoltaic module to prevent the junction box or the photovoltaic module from being stolen.

The junction box provided by the utility model is provided with the circuit board and the output cable in the cover, which is convenient for fastening and fixing with the cover. When the box body is fastened to the cover, the first output terminal and the output cable are turned on, that is, the output of the photovoltaic module is electrically connected to the output cable of the cover. In addition, when the circuit board fails or needs to replace the circuit board with different functions, the different cover can be replaced, and the operation is convenient.

Further, when the circuit board 603 is a DC circuit board, referring to FIG. 6, the cover 600 has two output cables 607; when the circuit board 603 is an AC circuit board, the circuit board 603 can be an inverter, and the output cable can be It is a multi-core AC cable.

Returning to Figure 6, the lid 600 also includes an upper lid liner 605. The upper cover liner 605 is sealingly engaged with the upper cover outer casing 601 such that the circuit board 603 is enclosed between the upper cover outer casing 601 and the upper cover inner liner 605 to achieve sealing protection for the circuit board 603. Preferably, the upper cover liner 605 and the upper cover outer casing 601 can be sealed by potting.

Preferably, the upper cover liner 605 is provided with a first through hole 611. The input terminal 609 of the circuit board 603 is electrically connected to the first output terminal 509 in FIG. 5 through the first through hole 611.

Typically, the cell string of the photovoltaic module is divided into three substrings, three substrings corresponding to three series of bypass diodes of the bypass diode group. The three battery substrings are connected in parallel to the two poles of the three bypass diodes through four wire bonds. It is easy to understand that the number of battery strings can be four, five or more, and the number of corresponding bypass diodes, wire ribbons, soldering strip fixed terminals, and first output terminals will increase accordingly. It is important to consider that the bypass diode group can be mounted on the box or cover of the junction box. The difference between the bypass diode group disposed on the casing or the lid is specifically described below.

When the bypass diode assembly is provided in the case, refer to FIGS. 5 and 6. In a conventional manner, the battery string includes three substrings in series, and two conductor strips are connected between adjacent substrings, and the first and second conductor strips are still present at both ends of the battery string. As shown, the box 500 has four soldering strap fixed terminals and four first inputs. The output terminals and the four solder ribbon fixed terminals are electrically connected to the four first output terminals. The case 500 includes a bypass diode group in series with three bypass diodes 505. The four strip fixed terminals 507 are electrically connected to both ends of the three bypass diodes 505. In other words, three bypass diodes 505 are disposed between the four strip fixed terminals 507. The first and second wire strips and the other two wire strips are connected to the strip fixing terminal 507, wherein the first and second lead strips are connected to the strip fixing terminals 507 at both ends of the bypass diode group, and the other two The wire bonding tape passes through the hole 511 and is respectively connected to the tape fixing terminal 505 except the both ends of the bypass diode group. The input terminal 609 of the cover 600 is two. When the case 500 is fastened to the cover 600, the input terminal 609 is electrically connected to the first output terminal 509 at both ends of the bypass diode group.

When the bypass diode is assembled, it is placed in the cover. Still in the conventional manner, the battery string includes three substrings in series, and two conductor strips are connected between adjacent substrings, and the first and second conductor strips are still present at both ends of the battery string. The box body has four soldering strip fixed terminals and four first output terminals, and the four soldering strip fixed terminals are electrically connected to the four first output terminals, respectively. The cover includes a bypass diode set with three bypass diodes in series. The input terminals of the circuit board are four, and the four input terminals are electrically connected at both ends of the three bypass diodes. When the box body is fastened to the cover, the four input terminals are electrically connected to the four first output terminals.

The four strip fixed terminals 507 are electrically connected to both ends of the three bypass diodes 505. In other words, three bypass diodes 505 are disposed between the four strip fixed terminals 507. The first and second wire strips and the other two wire strips are connected to the strip fixing terminal 507, wherein the first and second lead strips are connected to the strip fixing terminals 507 at both ends of the bypass diode group, and the other two The wire bonding tape passes through the hole 511 and is respectively connected to the tape fixing terminal 505 except the both ends of the bypass diode group. The input terminal 609 of the cover 600 is two. When the case 500 is fastened to the cover 600, the input terminal 609 is electrically connected to the first output terminal 509 at both ends of the bypass diode group.

On the other hand, referring to FIG. 5, the casing 501 is suitably attached and fixed to the photovoltaic panel of the photovoltaic module.

Preferably, a seal ring is provided around the inner periphery of the casing casing 501 and/or the upper casing 601. Fig. 5 schematically shows the seal ring 503 on the inner periphery of the casing 501. When the casing 500 is fastened to the lid 600, the seal ring 503 allows the junction box 400 to form a closed space, providing environmental protection.

Preferably, the case body 501 and/or the upper cover case 601 are provided with

snaps

513, 613, so that the case 500 and the cover 600 can be fastened to each other.

Figure 7 is a schematic view showing the structure of a first output terminal and a tape fixing terminal according to an embodiment of the present invention. The first output terminal includes a base 703 and an arc spring piece 701 fixed to the base 703, when the case and the cover When the snap-fit is fixed, the input terminal 702 is tightly pressed against the curved spring piece 701 to form a reliable power conduction. Preferably, the input terminal 702 has a square cylinder and can fit the curved spring piece 701 more closely. Of course, the first output terminal does not have to have an arc-shaped elastic piece, and the first output terminal can also be mated with the input terminal. For example, the first output terminal and the input terminal may also be other design shapes that achieve the same plug function, such as a pin, a flag spring, or the like.

The first output terminal is electrically connected to the strap fixing terminal. A second through hole 705 is formed in the fixed terminal of the solder ribbon for mounting the bypass diode. Preferably, a solder tab 707 is further disposed on the soldering strap fixing terminal to facilitate the fastening of the wire bonding tape to the bayonet 707.

Figure 8 is a simplified cross-sectional view of one embodiment of the present invention. As shown, the junction box 800 suitable for a photovoltaic module includes a top cover housing 801 and a box housing 809 that are fastened up and down. The junction box 800 includes a circuit board 803 and an upper cover lining 805. The input terminal 807 is electrically connected. Curved spring piece 811.

The invention relates to a junction box suitable for a photovoltaic module, wherein the output of the photovoltaic module and the output cable of the cover are communicated by the mutual engagement of the casing and the cover. The clock junction box allows PV modules to easily add and replace boards with different functions to meet different system requirements. This kind of junction box greatly improves the function and maintenance performance of the photovoltaic module and enhances the value of the photovoltaic component.

It is apparent to those skilled in the art that various modifications and variations can be made in the above-described embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A junction box suitable for a photovoltaic module, the photovoltaic module comprising a photovoltaic panel and a battery string, the junction box comprising:

a casing comprising a casing casing and a ribbon fixing terminal and a first output terminal disposed in the casing casing, the ribbon fixing terminal and the first output terminal being electrically connected, and the casing shell is opened a first wire ribbon and a second wire ribbon at both ends of the battery string pass through the hole and are electrically connected to the solder ribbon fixing terminal;

a cover comprising an upper cover housing and a circuit board disposed in the upper cover housing, the upper cover housing being provided with an output cable, the circuit board having an input terminal and a second output terminal, the second output terminal and The output cable is electrically connected;

The box body and the cover cover can be fastened and fixed, so that the first output terminal of the box body and the input terminal of the circuit board are electrically connected.
The junction box according to claim 1, wherein said battery string comprises N substrings connected in series, and N ≥ 2, and N-1 lead ribbons are connected between adjacent substrings. The casing has N+1 soldering strip fixed terminals and N+1 first output terminals;

The box body further includes a bypass diode group of N bypass diodes connected in series, and N+1 of the solder ribbon fixed terminals are electrically connected at opposite ends of the N bypass diodes at the bypass. The strip fixing terminals of the two ends of the diode group are respectively connected to the first and second lead ribbons;

Wherein the N-1 wire bonding strips pass through the holes and are respectively connected to the solder ribbon fixing terminals, except for the solder ribbon fixing terminals at both ends of the bypass diode group;

The input terminals of the cover are two. When the box is fastened to the cover, the input terminals are electrically connected to the first output terminals at both ends of the bypass diode group.
The junction box according to claim 1, wherein said battery string comprises N substrings connected in series, and N ≥ 2, and N-1 lead ribbons are connected between adjacent substrings. The casing has N+1 soldering strip fixed terminals and N+1 first output terminals;

The N-1 wire bonding strips pass through the holes and are respectively connected to N-1 of the soldering strip fixing terminals;

The circuit board includes a bypass diode group with N bypass diodes in series, the input of the circuit board The terminals are N+1, and the N+1 input terminals are electrically connected at opposite ends of the N bypass diodes;

When the box body is fastened to the cover, N+1 of the input terminals are electrically connected to the N+1 first output terminals.
The junction box according to any one of claims 1 to 3, wherein the circuit board comprises a circuit module, a communication circuit module, a protection circuit module, a maximum power point tracking circuit module and an inverter for monitoring the photovoltaic module One or more of the circuit modules.
A junction box according to any one of claims 1 to 3, wherein the circuit board is a DC circuit board or an AC circuit board.
The junction box according to claim 1, wherein said cover further comprises an upper cover inner liner, said upper cover inner liner sealingly engaging said upper cover outer casing, said circuit board being closed on said Between the cover housing and the upper cover liner.
The junction box according to claim 6, wherein the upper cover inner liner is provided with a first through hole, and the input terminal of the circuit board passes through the through hole and the first output terminal Sexual connection.
The junction box according to claim 1, wherein the bottom surface of the casing is suitably attached to the photovoltaic panel.
The junction box according to claim 1, wherein a seal ring is provided around the inner periphery of the casing casing and/or the upper casing.
The junction box according to claim 1, wherein the casing body and/or the upper casing is provided with a buckle to enable the casing and the cover to be fastened and fixed.
The junction box according to claim 1, wherein said first output terminal comprises a base and an arc spring piece fixed to said base, when said case is fastened to said cover, The input The terminal is tightly pressed against the curved spring piece.
The junction box according to claim 1, wherein a second through hole is formed in the soldering pin fixing terminal for mounting the bypass diode.
The junction box according to claim 1, wherein said first output terminal and said input terminal are mated.