CN209526103U - Back contacts solar cell interconnection architecture - Google Patents

Abstract

This application discloses a kind of back contacts solar cell interconnection architectures, including the multiple back contacts solar cells being sequentially arranged, in the adjacent two back contacts solar cell, the negative electrode of the previous back contacts solar cell is electrically connected with the positive electrode of the latter back contacts solar cell by conducting wire, the positive electricity extremely aluminium electrode.The positive electrode of above scheme, two neighboring back contacts solar cell is connected with negative electrode using conducting wire, and internal resistance is reduced.Further, since positive electrode uses aluminum material, compared to using silver electrode to significantly reduce production cost, and overcomes back contacts solar cell and cannot make the technology prejudice of electrode using aluminum.

Description

Back contacts solar cell interconnection architecture

Technical field

The utility model relates generally to solar photovoltaic technology field, and in particular to a kind of back contacts solar cell is mutual It is coupled structure.

Background technique

Back contacts solar cell, also known as interdigitated back contacts (Interdigitated Back Contact；IBC) too Positive electricity pond has broad application prospects as battery relatively high performance in current industry.At present in solar cell, Electrode of the electrode material usually using ag material as solar cell is easy welding since ag material has, and resistivity is small etc. excellent Point, thus it is widely used.And in fact, silver electrode material is a kind of noble metal, higher cost is unfavorable for industrialization.

In conventional solar cell, aluminum material is normally used as entire back side aluminium electrode and uses.Conventional sun electricity Aluminum material in pond, the resistivity of aluminium are higher than silver, and the resistance of the aluminium electrode of same width is greater than ag material and therefore has been generally acknowledged that Aluminium electrode is difficult to apply in very fine electrode structure in use process.Especially in this positive negative electricity of IBC solar cell In fine structure battery extremely overleaf, aluminium electrode is typically considered to not be available.And aluminum material generally also can not be in silicon It is used to be welded on solar cell, further limits the use of aluminium electrode.

Series connection or encapsulation between multiple solar cells are carried out usually using tin-coated welding strip, is distributed in solar cel electrode It is practical and conveniently using above-mentioned welding manner when battery two sides.But the IBC sun for positive and negative electrode overleaf Battery such as carries out welding interconnection using tin-coated welding strip in interconnection preparation process, and stress in the welding process can be poly- in single side Collection increases the risk of fragment and component breakage so that IBC solar cell generates bending；And easily cause IBC solar cell Other damages or short circuit.

Utility model content

In view of drawbacks described above in the prior art or deficiency, it is intended to provide a kind of back contacts solar cell interconnection architecture, is used To reduce the risks such as damaged or short circuit.

The utility model provides a kind of back contacts solar cell interconnection architecture, including the multiple back contacts sun being sequentially arranged Battery, in the adjacent two back contacts solar cell, the negative electrode of the previous back contacts solar cell connects with the latter back The positive electrode for touching solar cell is electrically connected by conducting wire, the positive electricity extremely aluminium electrode.

Further, at least described positive electrode, the negative electrode and the conducting wire thrin are coated with conductive layer.

Further, the material of the conductive layer is metal or alloy of the fusing point between 70-180 degree.

Further, the material of the conductive layer includes at least any one in Ag, Bi, Cd, Ga, In, Pb, Sn, Ti, Zn The simple substance or alloy of material.

Further, the material of the conductive layer is electroconductive resin of the softening temperature between 90-120 degree.

Further, the electroconductive resin includes resin base material and the conducting particles that is set in the resin base material.

Further, the resin base material includes epoxy resin, organic siliconresin, polyimide resin, phenolic resin, gathers Appointing in urethane, acrylic resin, polyolefin, polyamide, polyphenylene oxide, fluororesin, polymethyl methacrylate, polysulfones and polyester It is one or more.

Further, the conducting particles is graininess or sheet.

Further, the conducting particles includes at least any one in gold, silver, copper, aluminium, zinc, nickel and graphite.

Further, the material of the conducting wire includes at least any in copper, aluminium, silver, gold, corronil and ormolu Kind；

Or the conducting wire is copper-clad aluminum conductor.

Further, it is spaced to be arranged side by side between the adjacent two back contacts solar cells and has 12~100 conducting wires.

Further, it on the same back contacts solar cell, is set between the conducting wire and negative electrode that are electrically connected with positive electrode It is equipped with first insulator, is provided with second insulator between the conducting wire and positive electrode connecting with negative electrode.

The positive electrode of above scheme, two neighboring back contacts solar cell is connected with negative electrode using conducting wire, is reduced interior Resistance.Further, since positive electrode uses aluminum material, compared to using silver electrode to significantly reduce production cost, and overcomes back and connect Touching solar cell cannot make the technology prejudice of electrode using aluminum.

Detailed description of the invention

By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other Feature, objects and advantages will become more apparent upon:

Fig. 1 is the schematic diagram of back contacts solar cell interconnection architecture provided by the embodiment of the utility model；

Fig. 2 is the partial enlarged view I of Fig. 1.

Specific embodiment

The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining relevant utility model, rather than the restriction to the utility model.It further needs exist for illustrating , part relevant to utility model is illustrated only for ease of description, in attached drawing.

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in Figure 1 and Figure 2, back contacts solar cell interconnection architecture provided by the utility model is more including what is be sequentially arranged A back contacts solar cell 1, in two neighboring back contacts solar cell 1, the negative electrode 4 of previous back contacts solar cell 1 is with after The positive electrode 5 of one back contacts solar cell 1 is electrically connected by conducting wire 2, and positive electrode 5 is aluminium electrode.

In the present embodiment, the substrate of back contacts solar cell 1 can use n-type silicon substrate or use p-type silicon substrate, Preferred p-type silicon base can reduce the production cost of back contacts solar cell.

It is mentioned here it is previous, latter be not to be only to the restriction of adjacent two back contacts solar cells, 1 carry out sequence In order to distinguish description to two back contacts solar cells 1.In a reference direction, two adjacent back contacts solar cells 1 its In one be previous back contacts solar cell, another be latter back contacts solar cell；And in the reversed of reference direction, then before One back contacts solar cell is considered that latter back contacts solar cell, latter back contacts solar cell are considered previous back contacts too Positive electricity pond.

Conducting wire 2 can be electrically connected by way of hot pressing with positive electrode 5 and negative electrode 4 as a preferred method, generally Ground can smear conducting resinl 3 at positive electrode 5 and negative electrode 4, and conducting wire 2 is arranged on corresponding conducting resinl 3, and make it precisely Contraposition.For example, can control the temperature of hot pressing at 180 DEG C hereinafter, conducting resinl 3 is made to melt or soften, will be led after its cooling Line 2 forms good electrical connection with corresponding positive electrode 5 and negative electrode 4.100 DEG C of hot pressing temperature can such as, but not limited to be used Degree.

The electric conductivity at place is electrically connected to improve conducting wire with positive electrode 5 and negative electrode 4, at least in its junction, conducting wire 2 For flat structure, that is, the section of conducting wire 2 can be the forms such as ellipse, rectangle, quasi- rectangle.Certainly, section is round and can With.

Such as, but not limited to, positive electrode 5 and negative electrode 4 are interval gate electrode arranged side by side.

Above scheme, the positive electrode 5 and negative electrode 4 of two neighboring back contacts solar cell 1 use conducting wire, reduce interior Portion can also form electrical connection by the way of through hot pressing, be carried out by the way of hot pressing compared in solar cell single side The mode of welding can form being electrically connected for conducting wire 2 and positive electrode 5 and negative electrode 4 at a lower temperature, avoid because of welding When local temperature difference generate thermal stress cause back contacts solar cell 1 be bent or breakage problem.Further, since positive electrode 5 is adopted With aluminum material, compared to using silver electrode to significantly reduce production cost, and overcomes back contacts solar cell 1 and cannot use aluminium Make the technology prejudice of electrode.

Further, at least positive electrode 5, negative electrode 4 and 2 thrin of conducting wire are coated with conductive layer.

Here conductive layer can be conducting resinl 3, low-melting-point metal or alloy coat.Conducting resinl can be electroconductive resin. Hereafter it will be described in detail.

Further, the material of conductive layer is metal or alloy of the fusing point between 70-180 degree.Using above-mentioned temperature model Lower hot pressing temperature can be used in the conductive layer enclosed, reduces thermal stress and mechanical stress when hot pressing, prevents back and connect Touch solar cell bending, crack or it is broken the problems such as.

Further, the material of conductive layer includes at least any one material in Ag, Bi, Cd, Ga, In, Pb, Sn, Ti, Zn Simple substance or alloy.If the fusing point of simple substance is higher than above-mentioned temperature range, it is corresponding positioned at this temperature range to can choose its Alloy.

Further, the material of conductive layer is electroconductive resin of the softening temperature between 90-120 degree.

Further, electroconductive resin includes resin base material and the conducting particles that is set in resin base material.

Further, resin base material includes epoxy resin, organic siliconresin, polyimide resin, phenolic resin, poly- ammonia Any in ester, acrylic resin, polyolefin, polyamide, polyphenylene oxide, fluororesin, polymethyl methacrylate, polysulfones and polyester Kind is a variety of.

Further, conducting particles is graininess or sheet.

Further, conducting particles includes at least any one in gold, silver, copper, aluminium, zinc, nickel and graphite.

Further, the material of conducting wire 2 includes at least any one in copper, aluminium, silver, gold, corronil and ormolu； Or the wire rod of the lamination layer structures such as copper-clad aluminum conductor also can be used in conducting wire 2.Conducting wire 2 uses copper wire as a preferred method, uses Copper wire both conductivity with higher, and it is relative to using noble metals such as gold and silver, and has the advantages that at low cost.

Further, it is spaced to be arranged side by side between adjacent two back contacts solar cell 1 and has 12~100 conducting wires 2.More are led Line 2 can uniformly be intervally arranged.

The quantity of setting can comprehensively consider the needs for the transmission for guaranteeing electric current to determine.

Further, occur short circuit in order to prevent, on same back contacts solar cell 1, the conducting wire that is electrically connected with positive electrode 5 It is provided with first insulator between negative electrode 4, the second insulation is provided between the conducting wire connecting with negative electrode 4 and positive electrode 5 Body.

As a kind of implementation, the position coating conducting resinl 3 that can be electrically connected on positive electrode 5 with corresponding lead 2, and The position coating conducting resinl 3 being electrically connected on negative electrode 4 with corresponding lead 2, applies insulating layer coating in remaining position, then again by phase The conducting wire 2 answered is placed on progress hot pressing, the conducting wire 2 being thus electrically connected with positive electrode 5 at corresponding positive electrode 5 or negative electrode 4 First insulator is formd between negative electrode 4, the second insulation is formd between the conducting wire 2 connecting with negative electrode 4 and positive electrode 5 Body.

Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art Member is it should be appreciated that utility model range involved in the application, however it is not limited to made of the specific combination of above-mentioned technical characteristic Technical solution, while should also cover in the case where not departing from inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein Can technical characteristic replaced mutually and the technical solution that is formed.

Claims (12)

1. a kind of back contacts solar cell interconnection architecture, which is characterized in that including the multiple back contacts solar cells being sequentially arranged, In the adjacent two back contacts solar cell, the negative electrode of the previous back contacts solar cell and the latter back contacts sun The positive electrode of battery is electrically connected by conducting wire, the positive electricity extremely aluminium electrode.

2. back contacts solar cell interconnection architecture according to claim 1, which is characterized in that at least described positive electrode, institute It states negative electrode and the conducting wire thrin is coated with conductive layer.

3. back contacts solar cell interconnection architecture according to claim 2, which is characterized in that the material of the conductive layer is Metal or alloy of the fusing point between 70-180 degree.

4. back contacts solar cell interconnection architecture according to claim 3, which is characterized in that the material packet of the conductive layer Include the simple substance or alloy of at least any one material in Ag, Bi, Cd, Ga, In, Pb, Sn, Ti, Zn.

5. back contacts solar cell interconnection architecture according to claim 2, which is characterized in that the material of the conductive layer is Electroconductive resin of the softening temperature between 90-120 degree.

6. back contacts solar cell interconnection architecture according to claim 5, which is characterized in that the electroconductive resin includes tree Aliphatic radical material and the conducting particles being set in the resin base material.

7. back contacts solar cell interconnection architecture according to claim 6, which is characterized in that the resin base material includes ring Oxygen resin, organic siliconresin, polyimide resin, phenolic resin, polyurethane, acrylic resin, polyolefin, polyamide, polyphenyl Ether, fluororesin, polymethyl methacrylate, polysulfones and polyester are any one or more of.

8. back contacts solar cell interconnection architecture according to claim 6 or 7, which is characterized in that the conducting particles is Graininess or sheet.

9. back contacts solar cell interconnection architecture according to claim 6 or 7, which is characterized in that the conductive particle attached bag Include at least any one in gold, silver, copper, aluminium, zinc, nickel and graphite.

10. back contacts solar cell interconnection architecture according to claim 1-7, which is characterized in that the conducting wire Material include at least any one in copper, aluminium, silver, gold, corronil and ormolu；

Or the conducting wire is copper-clad aluminum conductor.

11. back contacts solar cell interconnection architecture according to claim 1-7, which is characterized in that adjacent two institute It states to be spaced to be arranged side by side between back contacts solar cell and has 12~100 conducting wires.

12. back contacts solar cell interconnection architecture according to claim 1-7, which is characterized in that same described On back contacts solar cell, it is provided with first insulator between the conducting wire and negative electrode that are electrically connected with positive electrode, is connected with negative electrode Second insulator is provided between the conducting wire and positive electrode connect.