CN108598206A - A kind of photovoltaic module - Google Patents

Abstract

The invention provides a photovoltaic module, comprising: a back plate, a solar cell, a welding strip, a negative lead-out bus bar, a positive lead-out bus bar, and a bus bar; the front and back electrodes of every 10 solar cells pass sequentially through the The above-mentioned welding ribbons are connected into photovoltaic cell strings, and 1 to 2n+1 strings of photovoltaic cells are arranged in parallel on the back plate from left to right, and n is any positive integer; The remaining 2n strings of photovoltaic cell strings are connected through the bus bar from left to right; the tail of the 2n+1 string of photovoltaic cell strings is welded to the positive lead-out bus bar, and the remaining 2n strings of photovoltaic cell strings String tails, from right to left, are connected between each other by the bus bar. The present invention uses an odd number of photovoltaic battery strings to form a photovoltaic module, and the bus bars at both ends of the entire photovoltaic module are in a symmetrical state, which balances the processing workload at both ends of the photovoltaic module and improves the processing efficiency.

Description

A photovoltaic module

technical field

The invention relates to the field of photovoltaic module preparation, in particular to a photovoltaic module.

Background technique

With the rapid development of social economy and the continuous improvement of people's living standards, the demand for energy is also increasing. As a sustainable new energy, solar energy has been widely favored because of its advantages of energy saving and environmental protection. At present, solar energy Batteries have been gradually used in people's daily life.

The actual utilization of photovoltaic modules is achieved by assembling single solar cells into solar photovoltaic modules. As shown in Figure 1, the process of assembling existing solar cells into photovoltaic modules is: first, several solar cells 1 front and back electrodes The battery strings are welded sequentially through the ribbon 2, such as connecting the front electrode of the "front" battery to the back electrode of the "back" battery sheet through the ribbon 2, and arranging a plurality of welded battery strings at equal intervals, and then the battery The beginning and the end of the string are connected by tailor-welding with the confluence belt 3 to form a semi-finished battery module and placed in the packaging structure, thus forming a photovoltaic module.

Among them, both the welding ribbon and the bus ribbon play the role of connecting solar cells and conducting electricity. Existing welding strips and confluence strips belong to two items with different specifications. The welding strips are generally made of copper material, and the confluence strips are generally tin-coated solder strips or tin-coated copper strips. The current mainstream photovoltaic modules are composed of 72 solar cells and 60 solar cells. Among them, photovoltaic modules composed of 60 solar cells account for the most, and the size of photovoltaic modules in the industry is 1640*992, or close to this size. As the industry develops, technology improves. At present, the power of this version has been increased from 250w in previous years to the mainstream power of 280W-300W, but photovoltaic power plant system designers prefer to design with 250W, in order to achieve the purpose of easy rounding.

However, when the photovoltaic modules of the existing 60 modules are stacked during the processing process, all the cells are finally connected to one end. Then in the process of processing, the processing workload of the employees at both ends of the module does not match, and one of the employees has a lower processing workload; With a three-terminal confluence belt, the workload of its upper and lower sides is inconsistent.

Contents of the invention

In order to solve the above problems, the present invention provides a photovoltaic module. The invention uses an odd number of photovoltaic cell strings to form a photovoltaic module. The bus bars at both ends of the entire photovoltaic module are in a symmetrical state, which balances the processing workload at both ends of the photovoltaic module. Improve the efficiency of processing operations; at the same time, the invention does not change the long side of the photovoltaic module of the traditional 60 module, only changes the length of its short side, and is compatible with the installation method of the traditional 60 module photovoltaic module; and the invention adopts a split junction box, inside the box The diodes are directly passed through the openings of the backplane through the lead wires. Compared with the traditional technology, there is no need to lengthen and gather to the central area to go out of the backplane, which can save the material consumption of the bus bar and reduce the line resistance and power loss of the entire assembly. At the same time, the isolation insulating strips required for pooling the central area are reduced.

In order to achieve the technical purpose, the technical solution of the present invention is: a photovoltaic module, including: a backplane, a solar cell, a welding ribbon, a negative lead-out bus bar, a positive lead-out bus bar, and a bus bar;

The front and back electrodes of every 10 solar cells are sequentially connected to form photovoltaic cell strings through the solder strips, and 1 to 2n+1 strings of photovoltaic cell strings are arranged in parallel on the back plate from left to right, and n is any positive integer;

The first string of photovoltaic cell strings is welded to the negative lead-out bus bar, and the remaining 2n strings of photovoltaic cell strings are connected through the bus bar from left to right;

The tails of the 2n+1 strings of photovoltaic cells are welded to the positive lead-out bus bars, and the tails of the remaining 2n strings of photovoltaic cells are connected through the bus bars from right to left.

As a preferred embodiment of the present invention, based on the above, the difference is that the value of n is 2, and 5 strings of photovoltaic cells are arranged in parallel on the back plate from left to right;

The first string of photovoltaic cell strings is welded with a negative lead-out bus bar, and the second string and the third string, and the fourth string and the fifth string of photovoltaic cell strings are connected through the bus bar;

The tail of the fifth string of photovoltaic cells is welded to the positive lead-out bus bar, and the tails of the fourth string and the third string, and the second string and the first string of photovoltaic cells are connected through the bus bar.

Further, 5 strings of photovoltaic cells are arranged in parallel to fill the backplane, and the size of the backplane is 830*1640mm.

Further, the photovoltaic module composed of 5 strings of photovoltaic cell strings has a total generating power of 250w.

Further, the first diode, the second diode, and the third diode are set, and the first string and the second string, the third string and the fourth string of photovoltaic cell strings are respectively connected through the first diode 1. The second diode is connected, and the string ends of the fourth and fifth photovoltaic cell strings are connected through the third diode.

Further, the first diode, the second diode, and the third diode are welded between two adjacent bus bars or the negative lead-out bus bar or the positive lead-out bus bar.

Further, the first diode, the second diode, and the third diode are respectively placed in three discrete junction boxes;

The backplane has holes at the intervals between the first string and the second string, the third string and the fourth string of photovoltaic cell strings, the fourth string and the fifth string of photovoltaic cell strings, and the discrete junction box is set on Under the backboard, two lead wires are set to lead out from the discrete junction box and welded to between two adjacent bus bars on the front side of the backboard through holes.

Preferably, a negative junction box and a positive junction box are set;

The first diode and the second diode are placed in the negative junction box; the third diode is placed in the positive junction box;

The backplane has holes at the intervals between the first string and the second string, the third string and the fourth string of photovoltaic cell strings, the fourth string and the fifth string of photovoltaic cell strings, and the negative junction box and the positive junction box It is arranged under the back plate, and the negative terminal box is provided with four leads, and the positive terminal box is provided with two lead wires through the hole to be welded between two adjacent bus bars or negative lead-out bus bars or positive lead-out bus bars on the front of the back plate .

The beneficial effects of the present invention are:

The present invention uses an odd number of photovoltaic cell strings to form a photovoltaic module, and the bus bars at both ends of the entire photovoltaic module are in a symmetrical state, which balances the processing workload at both ends of the photovoltaic module and improves the processing efficiency; at the same time, the present invention does not change the traditional 60 The long side of the photovoltaic module of the module only changes the length of its short side, which is compatible with the installation method of the traditional 60-module photovoltaic module; and the invention adopts a split junction box, and the diodes in the box are directly passed through the openings on the back plate through the lead wires. Compared with the traditional technology, there is no need to lengthen the central area to pass through the backplane, which can save the material consumption of the bus bar, reduce the line resistance and power loss of the entire assembly, and reduce the isolation and insulation strips required for the central area.

Description of drawings

Fig. 1 is a schematic structural diagram of a photovoltaic module with 60 modules;

Fig. 2 is the structural representation of photovoltaic assembly of the present invention;

Fig. 3 is one of electrical schematic diagrams of the photovoltaic module of the present invention;

Fig. 4 is the second electrical schematic diagram of the photovoltaic module of the present invention.

Detailed ways

The technical solution of the present invention will be clearly and completely described below.

As shown in Figure 2, a photovoltaic module includes: a backplane 4, a solar cell 1, a welding ribbon, a negative lead-out bus bar 5, a positive lead-out bus bar 6, and a bus bar 7;

The front and back electrodes of every 10 solar cells are sequentially connected to form photovoltaic cell strings through the solder strips, and 1 to 2n+1 strings of photovoltaic cell strings are arranged in parallel on the back plate from left to right, and n is any positive integer;

The first string of photovoltaic cell strings is welded to the negative lead-out bus bar 5, and the remaining 2n strings of photovoltaic cell strings are connected through the bus bar 7 from left to right;

The tails of the 2n+1 strings of photovoltaic cells are welded to the positive lead-out bus bars 6, and the tails of the remaining 2n strings of photovoltaic cells are connected through the bus bars 7 from right to left. The present invention uses an odd number of photovoltaic battery strings to form a photovoltaic module, and the bus bars at both ends of the entire photovoltaic module are in a symmetrical state, which balances the processing workload at both ends of the photovoltaic module and improves the processing efficiency.

As a preferred embodiment of the present invention, based on the above, the difference is that, as shown in Figure 2, the value of n is 2, and 5 strings of photovoltaic cells are arranged in parallel on the back plate from left to right ;

The first string of photovoltaic cell strings is welded with a negative lead-out bus bar, and the second string and the third string, and the fourth string and the fifth string of photovoltaic cell strings are connected through the bus bar;

The tail of the fifth string of photovoltaic cells is welded to the positive lead-out bus bar, and the tails of the fourth string and the third string, and the second string and the first string of photovoltaic cells are connected through the bus bar.

Further, 5 strings of photovoltaic cells are arranged in parallel to fill the backplane, and the size of the backplane is 830*1640mm. That is to say, the photovoltaic module of the present invention does not change the length of the long side of the photovoltaic module of the traditional 60 module, but only changes the length of its short side; since the general installation position of the photovoltaic module is on the long side, the photovoltaic module of the present invention will not change Module installation is difficult, compatible with traditional 60-module photovoltaic module installation methods.

Furthermore, the photovoltaic module composed of 5 strings of photovoltaic cells has a total power generation of 250w, which fills the gap of 250W conventional modules, and only needs to ensure the consistency of 50 solar cells to achieve a total power generation of 250w. The entire module Easier to splice and assemble.

Further, as shown in Figure 3, the first diode 8, the second diode 9, and the third diode 10 are set, and the first string and the second string, the third string and the fourth string of photovoltaic cells are first connected. Corresponding to the first diode connection and the second diode connection respectively, the fourth string and the fifth string of photovoltaic cell strings are connected through the third diode at the end of the string.

Further, the first diode, the second diode, and the third diode are welded between two adjacent bus bars 7 or the negative lead-out bus bar 5 or the positive lead-out bus bar 6 .

Further, the first diode, the second diode, and the third diode are respectively placed in three discrete junction boxes; the fourth string is divided by the second diode at the negative pole and the first diode at the positive pole. The three diodes are bypassed at the same time. If the 4th string is blocked, the 3rd string and the 5th string will form a parallel state. However, due to the limited current of the 1st string and the 2nd string, the final phenomenon is still only 3 strings. Work, which conforms to the traditional hot spot effect mppt power optimization, which shows that the electrical design of the present invention is reasonable.

The backplane has holes at the intervals between the first string and the second string, the third string and the fourth string of photovoltaic cell strings, the fourth string and the fifth string of photovoltaic cell strings, and the discrete junction box is set on Under the backboard, two lead wires are set to lead out from the discrete junction box and pass through the holes to be welded between two adjacent bus bars (including) 7 on the front side of the backboard. The invention adopts a split type junction box, and the diodes in the box are directly passed through the opening of the backboard through the lead wires. Compared with the traditional technology, there is no need to lengthen and gather to the central area before going out of the backboard, which can save the material consumption of the bus bar and reduce The line resistance and power loss of the entire assembly are reduced, while reducing the isolation insulation strips required for the central area of the pool.

Preferably, a negative junction box and a positive junction box are set;

The first diode and the second diode are placed in the negative junction box; the third diode is placed in the positive junction box;

The backplane has holes at the intervals between the first string and the second string, the third string and the fourth string of photovoltaic cell strings, the fourth string and the fifth string of photovoltaic cell strings, and the negative junction box and the positive junction box It is arranged under the back plate, and the negative terminal box is provided with four leads, and the positive terminal box is provided with two lead wires, which are welded to two adjacent bus bars 7 or the negative lead-out bus bar 5 or the positive lead-out bus bar on the front of the back plate through holes. between 6. That is to say, the negative terminal of the photovoltaic module of the present invention can use two discrete junction boxes to separate the first diode and the second diode, or use one negative junction box to accommodate the first diode and the second diode. Two diodes.

It should be noted that the electrical connection of the present invention can also be connected as shown in Figure 4, wherein the positive pole adopts double diodes, and the negative pole adopts a single diode. optimization effect.

For those skilled in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims (8)

1. a kind of photovoltaic module, which is characterized in that including：Backboard, solar battery sheet, welding, cathode draw busbar, anode Draw busbar, busbar；

The front and back electrode of every 10 solar battery sheets passes sequentially through the welding and connects into photovoltaic cell string, from a left side It to 1 to 2n+1 string photovoltaic cell string of right setting and is listed on the backboard, and n is arbitrary positive integer；

1st string photovoltaic cell string string head welding cathode draw busbar, and remaining 2n string photovoltaic cell strings string is first, from left to right two-by-two Between connected by the busbar；

2n+1 string photovoltaic cell string string tail welding anodes draw busbar, are left 2n string photovoltaic cell string string tails, from right to left It is connected between any two by the busbar.

2. photovoltaic module according to claim 1, which is characterized in that the value of the n is 2, and 5 optical crosstalks volt is arranged from left to right Battery strings are simultaneously listed on the backboard；

1st string photovoltaic cell string string head welding cathode draw busbar, the 2nd string and the 3rd string, the 4th string and the 5th string photovoltaic cell string String head is connected by the busbar；

5th string photovoltaic cell string string tail welding anode draws busbar, the 4th string and the 3rd string, the 2nd string and the 1st string photovoltaic cell string String tail is connected by the busbar.

3. photovoltaic module according to claim 2, which is characterized in that 5 string photovoltaic cell strings are booked the backboard, institute side by side It is 830*1640mm to state backboard size.

4. photovoltaic module according to claim 2, which is characterized in that the photovoltaic module of 5 string photovoltaic cell string compositions is always sent out Electrical power is 250w.

5. photovoltaic module according to claim 2, which is characterized in that the first diode of setting, the second diode, the three or two Pole pipe, the 1st string and the 2nd string, the 3rd string with the 4th go here and there photovoltaic cell string string head it is corresponding respectively connect by the first diode, the two or two Pole pipe connects, and the 4th string is connected with the 5th string photovoltaic cell string string tail by third diode.

6. photovoltaic module according to claim 5, which is characterized in that first diode, the second diode, the three or two Pole pipe is welded between adjacent two busbars.

7. photovoltaic module according to claim 6, which is characterized in that

Correspondence is placed in three discrete terminal boxes respectively for first diode, the second diode, third diode；

The backboard is in the 1st string and the 2nd string, the 3rd string and the 4th string photovoltaic cell string string head, the 4th string and the 5th string photovoltaic cell string String tail interval trepanning, discrete terminal box are set under the backboard, and two leads are arranged and are drawn from discrete terminal box And it is soldered to positive adjacent two busbars of backboard or cathode extraction busbar or anode extraction busbar across hole.

8. photovoltaic module according to claim 6, which is characterized in that setting negative junction box and positive terminal box；

First diode, the second diode are placed in negative junction box；Third diode is placed in positive terminal box；

The backboard is in the 1st string and the 2nd string, the 3rd string and the 4th string photovoltaic cell string string head, the 4th string and the 5th string photovoltaic cell string String tail interval trepanning, negative junction box, positive terminal box are set under the backboard, and negative junction box is arranged four and draws Line, positive terminal box are arranged two leads and are soldered to positive adjacent two busbars of backboard or cathode extraction busbar across hole Or between anode extraction busbar.