CN218603444U

CN218603444U - Special junction box for parallel connection and series connection of photovoltaic cell modules

Info

Publication number: CN218603444U
Application number: CN202222429861.4U
Authority: CN
Inventors: 范花兰
Original assignee: Cixi Zhaoyang Electronic Technology Co ltd
Current assignee: Cixi Zhaoyang Electronic Technology Co ltd
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2023-03-10
Anticipated expiration: 2032-09-14

Abstract

The utility model discloses a special terminal box of parallelly connected group cluster of photovoltaic module, including second photovoltaic module cluster, anodal terminal box, middle terminal box, negative pole terminal box and first photovoltaic module cluster. A special terminal box of parallelly connected group cluster of photovoltaic cell subassembly, every cluster all has two independent lead-out wires, but the positive or negative pole of tip can make respectively about cluster one end merge a department output for positive or negative, can improve 1/6's subassembly output than traditional photovoltaic cell subassembly when the subassembly has the hot spot effect, the electric current that bears the weight of on the diode is only half of whole piece battery current, present most efficient battery whole piece battery current <19A, consequently branch road current <10A long-term work diode surface temperature <130, diode junction failure temperature 145-150, just so guaranteed the switching characteristic of diode, make the diode not damaged, thereby the conflagration hidden danger has been reduced, make photovoltaic cell subassembly obtain better protection.

Description

Special junction box for parallel connection and series connection of photovoltaic cell modules

Technical Field

The utility model relates to a solar cell technical field, in particular to special terminal box of parallelly connected group cluster of photovoltaic cell subassembly.

Background

The special junction box for the photovoltaic cell component parallel connection group string is a supporting structure for electrical output of the photovoltaic cell string, in the design of the photovoltaic component, the junction box is a component which is only communicated with the photovoltaic cell string in the component to carry out electrical output, and a plurality of photovoltaic components are electrically connected in series through junction box output cables on the photovoltaic component to form a certain voltage to drive an inverter to work, so that the conversion of direct current and alternating current is realized.

The junction box is also a device with higher fault rate in the existing photovoltaic power generation system, the junction box mainly has the function of protecting a module battery to provide a loop for a circuit under the hot spot effect so that a good battery pack string can continue to generate power, but the current generated by the existing photovoltaic battery module reaches above 18A at most, the existing photovoltaic battery module is made into a half or smaller battery in order to reduce loss, then two strings are connected in parallel to generate power, if one string has fault, a protection bypass diode needs to be started to work, and the other string is also bypassed at the moment, so that the two strings hardly generate power, the power is reduced, and certain adverse effect is brought to the using process of people.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model provides a not enough to prior art, the utility model provides a special terminal box of parallelly connected group cluster of photovoltaic cell subassembly, every cluster all has two independent lead-out wires, but the positive or negative pole of tip can make respectively about cluster one end merge a department output for positive or negative, can improve 1/6's subassembly output than traditional photovoltaic cell subassembly when the subassembly has the hot spot effect, the electric current that bears on the diode is only half of whole piece battery current, present most efficient battery whole piece battery current <19A, consequently branch road current <10A long-term work diode surface temperature <130, diode junction failure temperature 145-150, just so guaranteed the switching characteristic of diode, make the diode not damaged, thereby the fire hazard has been reduced, make photovoltaic cell subassembly obtain better protection, can effectively solve the problem in the background art.

(II) technical scheme

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a special terminal box of parallel group cluster of photovoltaic module, includes second photovoltaic battery group cluster, positive terminal box, intermediate junction box, negative terminal box and first photovoltaic battery group cluster, be connected with parallel structure between second photovoltaic battery group cluster and the first photovoltaic battery group cluster, and parallel structure's position comprises positive terminal box, intermediate junction box, negative terminal box, be connected with first series structure on the second photovoltaic battery group cluster, be connected with second series structure on the first photovoltaic battery group cluster.

As an optimal technical scheme of this application, all fix a position and install the lid on anodal terminal box, middle terminal box, the negative terminal box, the location has the briquetting on the anodal terminal box, be connected with anodal diode between anodal terminal box and the middle terminal box, be connected with the negative diode between middle terminal box and the negative terminal box, be connected with middle diode on the negative terminal box.

As an optimal technical scheme of this application, be connected with the backward flow strip on anodal terminal box, middle terminal box, the negative terminal box, the one end electric connection of anodal terminal box has first connecting wire, first connecting wire tip electric connection has first connecting terminal, the one end electric connection of negative terminal box has the second connecting wire, the tip electric connection of second connecting wire has the second connecting terminal, the position that first connecting wire is connected to anodal terminal box is provided with the negative pole port, the position that second connecting wire is connected to the negative terminal box is provided with the positive pole port.

As an optimal technical scheme of this application, second photovoltaic battery group cluster is provided with the multiunit, and through first series structure series connection between the second photovoltaic battery group cluster, first photovoltaic battery group cluster is provided with the multiunit, and through second series structure series connection between the first photovoltaic battery group cluster, through parallel structure parallel connection between first photovoltaic battery group cluster and the second photovoltaic battery group cluster, and draw forth through anodal terminal box, middle terminal box, negative terminal box independently when parallelly connected.

As an optimal technical scheme of this application, all with the lid between sealed block location between positive terminal box, middle terminal box, the negative terminal box, the location installation between positive terminal box and the briquetting, positive diode, negative diode, middle diode are installed to the electrical property between positive terminal box, middle terminal box, the negative terminal box.

As a preferred technical scheme of this application, electric connection between positive terminal box, middle terminal box, negative pole terminal box and the backward flow strip, electric connection between positive terminal box and first connecting wire, the first connecting terminal, electric connection between negative pole terminal box and second connecting wire, the second connecting terminal.

As a preferred technical solution of the present application, each of the second photovoltaic battery string and the first photovoltaic battery string has two independent outgoing lines, and the positive or negative poles at the end portions can respectively make one end of the upper string and one end of the lower string merge together to output a positive or negative level.

As a preferred technical solution of the present application, the second photovoltaic battery string and the first photovoltaic battery string are only combined into one path at the output end or the input end, and the middle branch must be connected in series with one path.

(III) advantageous effects

Compared with the prior art, the utility model provides a special terminal box of parallelly connected group cluster of photovoltaic cell subassembly possesses following beneficial effect: the special junction box for the parallel connection series of the photovoltaic cell assemblies, each series is provided with two independent leading-out wires, positive and negative poles at the end parts can enable one end of each upper series to be combined with one end of each lower series to output positive or negative, when the assembly has a hot spot effect, the assembly output power can be improved by 1/6 compared with that of a traditional photovoltaic cell assembly, the current borne by a diode is only half of the current of the whole cell, the current of the current most efficient cell is less than 19A, therefore, the branch current is less than 10A, the surface temperature of the diode is less than 130 degrees after long-term operation, the failure temperature of a diode junction is 145-150 degrees, the switching characteristic of the diode is guaranteed, the diode is not damaged, fire hazard is reduced, the photovoltaic cell assemblies are better protected, the second photovoltaic cell series is provided with multiple groups, the second photovoltaic cell series is connected in series through a first series structure, the first photovoltaic cell series is provided with multiple groups, the first photovoltaic cell series is connected with the second photovoltaic cell series through a junction box in parallel connection, the positive poles of the middle series are connected in parallel connection series, the first photovoltaic cell series is connected with the second series, the second series is more convenient, the operation of the special junction box, the single photovoltaic cell series is not influenced by the traditional hot spot effect, and the single lead out of the single photovoltaic cell series connection of the other special junction box.

Drawings

Fig. 1 is the overall structure schematic diagram of the utility model relates to a special terminal box of parallel group cluster of photovoltaic cell subassembly.

Fig. 2 is the structural schematic diagram of the utility model relates to a terminal box decomposes in special terminal box of parallel group cluster of photovoltaic cell subassembly.

Fig. 3 is the structural schematic diagram of the utility model relates to a terminal box decomposes wiring in special terminal box of parallel group cluster of photovoltaic cell subassembly.

Fig. 4 is a schematic diagram of the structure of the assembly typesetting and wire outgoing in the junction box special for the parallel connection and string connection of the photovoltaic cell assembly of the utility model.

Fig. 5 is a schematic structural diagram of wiring and layout of the solar cell module in the junction box dedicated for parallel connection and series connection of the photovoltaic cell module.

Fig. 6 is a schematic structural diagram of the diode principle in the junction box dedicated for parallel connection and series connection of the photovoltaic cell module of the present invention.

Fig. 7 is a schematic structural diagram of the junction box principle in the junction box special for the parallel connection and series connection of the photovoltaic cell module of the present invention.

In the figure: 1. a cover; 2. a positive terminal box; 3. briquetting; 4. a positive electrode diode; 5. an intermediate junction box; 6. a negative diode; 7. a negative terminal box; 8. a middle diode; 9. a first connecting wire; 10. a first connection terminal; 11. a second connecting wire; 12. a second connection terminal; 13. a first photovoltaic cell string; 14. a second photovoltaic cell string; 15. reflowing the strips; 16. a negative port; 17. a positive port; 18. a first series arrangement; 19. a parallel structure; 20. a second series configuration.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings and detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

As shown in fig. 1-7, a special junction box for a parallel connection string of photovoltaic cell modules comprises a second photovoltaic cell string 14, a positive junction box 2, an intermediate junction box 5, a negative junction box 7 and a first photovoltaic cell string 13, a parallel structure 19 is connected between the second photovoltaic cell string 14 and the first photovoltaic cell string 13, the parallel structure 19 is composed of the positive junction box 2, the intermediate junction box 5 and the negative junction box 7, the second photovoltaic cell string 14 is connected with a first string connection structure 18, the first photovoltaic cell string 13 is connected with a second series structure 20, each string of the second photovoltaic cell string 14 and the first photovoltaic cell string 13 has two independent outgoing lines, and positive or negative poles at the end part can respectively enable one end of the upper string and the lower string to be combined together to output as positive or negative grade, when one of the second photovoltaic battery string 14 and the first photovoltaic battery string 13 has a hot spot effect, the output power of the component can be improved by 17%, the current passing through the diode is only half of the whole battery, the temperature of the diode is less than 130 ℃ when the current is at most 9A for long-term operation, as long as one string has the hot spot, the string stops working and does not affect other strings, each string is provided with two independent leading-out wires, but positive and negative poles at the end part can respectively enable one end of an upper string and one end of a lower string to be combined to output positive or negative, when the component has the hot spot effect, the output power of the component can be improved by 1/6 compared with the traditional photovoltaic battery component, the current carried by the diode is only half of the current of the whole battery, the current of the most efficient battery is less than 19A, therefore, the branch current is less than 10A for long-term operation, the surface temperature of the diode is less than 130 ℃, the junction failure temperature of the diode is 145-150 ℃, thus the switching characteristic of the diode is ensured, and the diode is not damaged, thereby reducing the fire hazard and better protecting the photovoltaic cell component.

Furthermore, the positive terminal box 2, the middle terminal box 5 and the negative terminal box 7 are all provided with covers 1 in a positioning mode, the positive terminal box 2 is provided with a pressing block 3 in a positioning mode, a positive diode 4 is connected between the positive terminal box 2 and the middle terminal box 5, a negative diode 6 is connected between the middle terminal box 5 and the negative terminal box 7, and a middle diode 8 is connected on the negative terminal box 7.

Further, the positive terminal box 2, the intermediate terminal box 5 and the negative terminal box 7 are connected with a backflow strip 15, one end of the positive terminal box 2 is electrically connected with a first connecting wire 9, the end of the first connecting wire 9 is electrically connected with a first connecting terminal 10, one end of the negative terminal box 7 is electrically connected with a second connecting wire 11, the end of the second connecting wire 11 is electrically connected with a second connecting terminal 12, the position of the positive terminal box 2, which is connected with the first connecting wire 9, is provided with a negative port 16, and the position of the negative terminal box 7, which is connected with the second connecting wire 11, is provided with a positive port 17.

Further, the second photovoltaic battery strings 14 are provided with a plurality of groups, the second photovoltaic battery strings 14 are connected in series through the first series structure 18, the first photovoltaic battery strings 13 are provided with a plurality of groups, the first photovoltaic battery strings 13 are connected in series through the second series structure 20, the first photovoltaic battery strings 13 and the second photovoltaic battery strings 14 are connected in parallel through the parallel structure 19, and the first photovoltaic battery strings 13, the second photovoltaic battery strings are independently led out through the positive terminal box 2, the middle terminal box 5 and the negative terminal box 7 during parallel connection.

Furthermore, the positive terminal box 2, the middle terminal box 5 and the negative terminal box 7 are sealed, clamped and positioned with the cover 1, the positive terminal box 2 and the pressing block 3 are positioned and installed, and the positive diode 4, the negative diode 6 and the middle diode 8 are electrically installed among the positive terminal box 2, the middle terminal box 5 and the negative terminal box 7.

Further, the positive terminal box 2, the intermediate terminal box 5, the negative terminal box 7 and the reflow bar 15 are electrically connected, the positive terminal box 2 is electrically connected with the first connecting wire 9 and the first connecting terminal 10, and the negative terminal box 7 is electrically connected with the second connecting wire 11 and the second connecting terminal 12.

Furthermore, each of the second photovoltaic battery string 14 and the first photovoltaic battery string 13 has two independent outgoing lines, and the positive pole or the negative pole at the end part can make one end of the upper string and one end of the lower string merge together to output positive or negative level.

Furthermore, when one of the second photovoltaic battery string 14 and the first photovoltaic battery string 13 has the hot spot effect, the output power of the assembly can be improved by 1/6 compared with that of the traditional photovoltaic battery assembly, the current carried by the diode is only half of the current of the whole battery, the current is less than 10A, and the temperature of the diode in long-term operation is less than 130 degrees.

As shown in fig. 7, the second pv cell string 14 and the first pv cell string 13 are merged into one path only at the output or input end, and the middle branch must be connected in series.

The working principle is as follows: the utility model comprises a cover 1, an anode terminal box 2, a pressing block 3, an anode diode 4, an intermediate terminal box 5, a cathode diode 6, a cathode terminal box 7, an intermediate diode 8, a first connecting wire 9, a first connecting terminal 10, a second connecting wire 11, a second connecting terminal 12, a first photovoltaic battery string 13, a second photovoltaic battery string 14, a backflow strip 15, a cathode port 16, an anode port 17, a first string connecting structure 18, a parallel structure 19, a second series structure 20, the second photovoltaic battery string 14 is provided with a plurality of groups, the second photovoltaic battery string 14 is connected in series through the first series structure 18, the first photovoltaic battery string 13 is provided with a plurality of groups, the first photovoltaic battery string 13 is connected in series through the second series structure 20, the first photovoltaic battery string 13 is connected in parallel with the second photovoltaic battery string 14 through the parallel structure 19, when the photovoltaic modules are connected in parallel, the photovoltaic modules are led out independently through the positive terminal box 2, the middle terminal box 5 and the negative terminal box 7, the second photovoltaic cell string 14 and the first photovoltaic cell string 13 are only combined into one path at the output or input end, the middle branch is connected in series, each string of the second photovoltaic cell string 14 and the first photovoltaic cell string 13 is provided with two independent lead-out wires, the positive pole or the negative pole at the end part can enable one end of the upper string and the lower string to be combined together to output positive or negative level, when one of the second photovoltaic cell string 14 and the first photovoltaic cell string 13 has the hot spot effect, the output power of the module can be improved by 17%, the current passing through the diode is only half of the whole battery, the current is at most 9A, the temperature of the diode is less than 130 degrees after long-term operation, as long as one string has the hot spot, the string stops operating, the other strings are not influenced, and each string is provided with two independent lead-out wires, however, the positive pole or the negative pole at the end part can respectively enable one end of the upper string and the lower string to be combined together to output positive or negative, when the assembly has a hot spot effect, the assembly output power can be improved by 1/6 compared with that of the traditional photovoltaic cell assembly, the current carried by the diode is only half of the current of the whole battery, and the current of the current most efficient battery is less than 19A, so that the branch current is less than 10A, the surface temperature of the diode is less than 130 degrees after long-term operation, the failure temperature of the diode junction is 145-150 degrees, the switching characteristic of the diode is ensured, the diode is not damaged, the fire hazard is reduced, and the photovoltaic cell assembly is better protected.

It is noted that, herein, relational terms such as first and second (a, b, etc.) and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The foregoing shows and describes the basic principles and principal features of the invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.

Claims

1. The utility model provides a special terminal box of parallelly connected group of photovoltaic cell subassembly cluster, includes second photovoltaic cell group cluster (14), anodal terminal box (2), middle terminal box (5), negative pole terminal box (7) and first photovoltaic cell group cluster (13), its characterized in that: a parallel structure (19) is connected between the second photovoltaic battery pack string (14) and the first photovoltaic battery pack string (13), the position of the parallel structure (19) is composed of a positive terminal box (2), a middle terminal box (5) and a negative terminal box (7), the second photovoltaic battery pack string (14) is connected with a first string connection structure (18), and the first photovoltaic battery pack string (13) is connected with a second series connection structure (20);

the positive terminal box (2), the middle terminal box (5) and the negative terminal box (7) are all provided with covers (1) in a positioning mode, the positive terminal box (2) is provided with a pressing block (3) in a positioning mode, a positive diode (4) is connected between the positive terminal box (2) and the middle terminal box (5), a negative diode (6) is connected between the middle terminal box (5) and the negative terminal box (7), and a middle diode (8) is connected on the negative terminal box (7);

the connecting structure comprises an anode connecting box (2), an intermediate connecting box (5) and a cathode connecting box (7), wherein a backflow strip (15) is connected to the anode connecting box (2), one end of the anode connecting box (2) is electrically connected with a first connecting wire (9), the end of the first connecting wire (9) is electrically connected with a first connecting terminal (10), one end of the cathode connecting box (7) is electrically connected with a second connecting wire (11), the end of the second connecting wire (11) is electrically connected with a second connecting terminal (12), a cathode port (16) is arranged at the position where the anode connecting box (2) is connected with the first connecting wire (9), and an anode port (17) is arranged at the position where the cathode connecting box (7) is connected with the second connecting wire (11);

the photovoltaic cell system is characterized in that a plurality of groups of second photovoltaic cell group strings (14) are arranged, the second photovoltaic cell group strings (14) are connected in series through a first series structure (18), a plurality of groups of first photovoltaic cell group strings (13) are arranged, the first photovoltaic cell group strings (13) are connected in series through a second series structure (20), the first photovoltaic cell group strings (13) and the second photovoltaic cell group strings (14) are connected in parallel through a parallel structure (19), and when the first photovoltaic cell group strings and the second photovoltaic cell group strings are connected in parallel, the first photovoltaic cell group strings and the second photovoltaic cell group strings are led out independently through an anode junction box (2), a middle junction box (5) and a cathode junction box (7);

all with sealed block location between lid (1) between positive terminal box (2), middle terminal box (5), the negative pole terminal box (7), the location installation between positive terminal box (2) and briquetting (3), positive diode (4), negative pole diode (6), middle diode (8) are installed to the electrical property between positive terminal box (2), middle terminal box (5), negative pole terminal box (7).

2. The special junction box for the parallel and serial connection of the photovoltaic cell assemblies as claimed in claim 1, wherein: the positive terminal box (2), the intermediate terminal box (5), the negative terminal box (7) and the backflow strip (15) are electrically connected, the positive terminal box (2) is electrically connected with the first connecting wire (9) and the first connecting terminal (10), and the negative terminal box (7) is electrically connected with the second connecting wire (11) and the second connecting terminal (12).

3. The special junction box for the parallel connection and series connection of the photovoltaic cell modules as claimed in claim 2, wherein: each of the second photovoltaic battery string (14) and the first photovoltaic battery string (13) is provided with two independent outgoing lines, and positive and negative poles at the end parts can enable one end of the upper string and one end of the lower string to be combined together to output positive or negative levels.

4. The special junction box for the parallel connection and series connection of the photovoltaic cell modules as claimed in claim 3, wherein: the second photovoltaic battery string (14) and the first photovoltaic battery string (13) are combined into one path only at the output end or the input end, and the middle branch is connected with one path in series.