阅读说明：本技术 光伏模块，光伏密封剂和生产光伏模块的方法 (Photovoltaic module, the method for photovoltaic sealant and production photovoltaic module ) 是由 托马斯·瑟德斯特伦 姚宇 谢达·拜亚 马休·戴斯佩斯 贝娜迪特·莱恩博内特-埃马尔德 李恒 于 2018-04-10 设计创作，主要内容包括：本发明涉及一种光伏模块(1),包括：-至少一个光敏部件(2),诸如太阳能电池或薄膜等；和-密封剂(3、3’),其在至少一侧覆盖所述至少一个光敏部件(2),其中密封剂(3)由在第一温度下具有第一复数粘度并且在第二温度下具有第二复数粘度的材料形成,其中第一复数粘度大于第二复数粘度,并且其中第一温度在70℃至100℃之间,第二温度在120℃至160℃之间,其特征在于,第一复数粘度至少为100,000Pa·s,优选地至少为200,000Pa·s。(The present invention relates to a kind of photovoltaic module (1), comprising:-at least one photosensitive part (2), solar battery or film etc.；With-sealant (3,3'), it covers at least one described photosensitive part (2) at least side, wherein sealant (3) is by the material with the second complex viscosity is formed with the first complex viscosity and at the second temperature at the first temperature, wherein the first complex viscosity is greater than the second complex viscosity, and wherein the first temperature is between 70 DEG C to 100 DEG C, second temperature is between 120 DEG C to 160 DEG C, it is characterized in that, first complex viscosity is at least 100,000Pas, preferably at least 200,000Pas.)

1. a kind of photovoltaic module (1), comprising:

At least one photosensitive part (2), solar battery or film etc.；With

Sealant (3,3') covers at least one described photosensitive part (2) at least side,

Wherein, the sealant (3,3') by having the with the first complex viscosity and at the second temperature at the first temperature The material of two complex viscosities is formed, wherein first complex viscosity is greater than second complex viscosity, and wherein described the One temperature between 70 DEG C to 100 DEG C, the second temperature between 120 DEG C to 160 DEG C,

It is characterized in that, first complex viscosity is at least 100,000Pas, preferably at least 200,000Pas.

2. photovoltaic module according to claim 1, wherein second complex viscosity is less than 500,000Pas, preferably Less than 100,000Pas, even more preferably less than 50,000Pas.

3. photovoltaic module according to claim 1 or 2, wherein first complex viscosity is bigger than second complex viscosity At least 5 times, preferably at least 10 times.

4. photovoltaic module according to any one of the preceding claims, wherein second complex viscosity is greater than 5, 000Pas, preferably more than 9,000Pas.

5. photovoltaic module according to any one of the preceding claims, wherein first complex viscosity is less than 1E+ 10Pas, preferably less than 1E+9Pas.

6. photovoltaic module according to any one of the preceding claims, wherein first temperature 75 DEG C to 95 DEG C it Between, preferably between 80 DEG C to 90 DEG C, wherein preferably, first temperature is 85 DEG C.

7. photovoltaic module according to any one of the preceding claims, wherein the second temperature is at 125 DEG C to 155 DEG C Between, preferably between 130 DEG C to 150 DEG C, wherein preferably, the second temperature is 140 DEG C.

8. photovoltaic module according to any one of the preceding claims, wherein the sealant (3,3') and it is described at least One photosensitive part (2) directly contacts, and/or wherein, at least one electric interconnector (5) be sandwiched in the sealant (3,3') and Between the photosensitive part (2), and/or wherein, at least one described electric interconnector (5) is maintained at by the sealant (3,3') On at least one described photosensitive part (2), and/or wherein, the sealant (3,3') is provided in the form of foil and/or particle.

9. photovoltaic module according to any one of the preceding claims, wherein the material of the sealant (3,3') has Thermoplasticity.

10. photovoltaic module according to any one of the preceding claims, wherein the material of the sealant (3,3') includes Low density polyethylene (LDPE) (LDPE) material and/or linear low density polyethylene (LLDPE) material and/or intermediate density polyethylene (MDPE) material.

11. photovoltaic module according to any one of the preceding claims, wherein the sealant (3,3') is by poly- to benzene two Formic acid glycol ester (PET) and/or polyolefin (PO) and/or ethylene-vinyl acetate (EVA) and/or ionomer and/or poly- second Enol butyral (PVB) formation.

12. photovoltaic module according to any one of the preceding claims, wherein form the material of the sealant (3,3 ') Density be less than 1.5g/cm³, and preferably more than 0.7g/cm³。

13. photovoltaic module according to any one of the preceding claims, wherein the sealant (3,3') is thickness 10 μm between 500 μm, layers of foil preferably between 40 μm to 400 μm, and/or wherein, the sealant (3,3') is for can It is transparent that the wavelength of light-exposed spectrum is at least 50%.

14. photovoltaic module according to any one of the preceding claims, wherein the complex viscosity is according to standard ASTM D5289 and/or ASTM D6204 is determined, and is measured under the frequency of 1Hz and 10% strain.

15. a kind of photovoltaic sealant (3,3'), especially sealant foil or sealant particle, wherein the sealant (3,3') by The material with the second complex viscosity is formed with the first complex viscosity and at the second temperature at the first temperature, wherein institute The first complex viscosity is stated greater than second complex viscosity, and wherein first temperature between 70 DEG C to 100 DEG C and The second temperature is between 120 DEG C to 160 DEG C, which is characterized in that and first complex viscosity is at least 100,000Pas, Preferably at least 200,000Pas, wherein preferably, the electric interconnector (5) that at least one is used to interconnect photosensitive part (2) is attached It is connected to the sealant (3,3').

16. photovoltaic sealant according to claim 15, wherein the complex viscosity according to standard ASTM D5289 and/ Or ASTM D6204 is determined, and is measured under the frequency of 1Hz and 10% strain.

17. a kind of method for producing photovoltaic module (1), comprising the following steps: with sealing according to claim 15 or 16 Agent (3,3') seals at least one photosensitive part (2), solar battery or film etc., wherein preferably, at least one is electric Connectors (5) are attached to the sealant (3,3').

Technical field

The present invention relates to photovoltaic modules according to claim 1.Moreover, the present invention relates to photovoltaic sealant, it is especially close The method sealed agent foil or sealant particle, and further relate to production photovoltaic module, it is (all including the use of sealant sealing photosensitive part Such as solar battery or film) the step of.The invention further relates to include sealant and electric interconnector of the invention line foil or Electrode, it is preferable that conducting wire is such as conducting wire known to 2004/021455 A1 of WO.

Background technique

Most of solar cell modules are by being formed including glass plate, light-sensitive element and being made or be formed as by glass The laminate manufacture of the rear cover of backboard.These layers are kept together by so-called sealant to form laminate, wherein close Envelope agent is to adhere to these layers of material that is upper and filling any gap in laminates (such as space between solar battery) Material.These sealants can be for example containing such as EVA, TPSE (thermoplastic silicones elastomer), TPU (thermoplastic polyurethane), TPO The rigid plastics such as (thermoplastic polyolefin elastomer), ionomer, or such as PVB, the thermoplastics such as silicon or polyolefin.It can also be with It uses the composition of thermoplastic and rigid plastics: keeping thermoplasticity but can be by suitable mode (such as heating or electricity Son irradiation) cured material.The selection of sealant depends on position and function (example in many factors, such as cost, module Such as, the sealant of solar battery sun side must be more transparent than the sealant of shadow side), market expectations etc..

Solar battery (photovoltaic) module is generally constructed at least five layers of laminate in the following order: (a) glass Glass layer or other hyaline layers, (b) first or preceding sealant layer, (c) photosensitive part layer, (d) second or sealing backside oxidant layer, and (e) back layer, such as backboard or glassy layer.In the case where thin-film solar cell panel, photosensitive part layer is attached to glassy layer On, other than the possibility interconnection piece of film unit, it is only necessary to add a layer sealing agent and backboard (such as backboard or glassy layer).Lamination The manufacturing method of solar cell module is typically included in solar battery (one or more) and other module layers (such as glass Layer and backing layer) between place sealing foil.The prior art uses 400-500 μm of foil.Sealant layer is designed to seal and protect Brittleness solar cell layer is protected from environmental disruption, therefore extends their service life.In general, solar cell module will In conjunction at least two sealant layers being clipped in around solar cell layer.Two sealant layers can be identical or different material Material.

Nowadays, sealant is usually placed in stacked in the form of foil before being laminated.Lamination be mainly after forming layer The all material (except the material cut off after laminating) of casting die, such as form the solar panel of multilayer.WO2011/ 089473 is disclosed in detail the laminating technology of solar panel.

Foil must by cutting, handle and be correctly placed on lamination.Since module is very big, so this is pretty troublesome.Foil also must Palpus correct placement in stacked, and must not shift.This may malfunction, so as to cause economic loss.Moreover, foil had been laminated Cheng Zhonghui is shunk.This is as caused by the production technology of foil.Moreover, foil is by liquefied polymeric composition granule and to be become foil and produced Raw.In addition, the production process chinese raw materials in foil is lost, lead to additional cost.

Due to the first two (alignment and contraction), need for foil to be made to bigger than final module.After lamination, foil (or foil Residue, as stickum) it is prominent from module, it is necessary to remove it, this is before sealant is hardened over time It is not easy to, to extend the processing time.Equally, if foil outstanding be it is soft, it will be sticked on machine part, example On conveyer belt as where it and for being pressed against film together, it is therefore necessary to periodically cleaning.It can provide thus Brush.But there is also non-shrinking foils, especially thermoplastic foil.

WO2015/056069A1, which is disclosed, uses a possibility that particle is as sealant, as the substituted or supplemented of foil.

WO2014/081999A1 discloses a kind of solar cell module comprising multiple solar batteries and sealing should The sealant of multiple solar batteries.Sealant includes the polyene under 90 ° with the complex viscosity less than 10,000Pas Hydrocarbon.Table 1 shows the complex viscosity as unit of Pas of four samples, and wherein sample 3 and 4 meets above-mentioned standard.There is provided one For kind for realizing the protection packaging of crack resistance, which includes top cover, sealant and backboard.

The main target of photovoltaic technology is to reduce manufacturing cost.Further decrease the cost and photovoltaic module of photovoltaic module Compromise between reliability is the most important challenge of photovoltaic industry.Such as SWCT (intelligent grid interconnection technique), Shingling (imbrication technology), the new technologies such as MBB (more bus > 4) are emerged in large numbers, to improve efficiency and reduce material consumption.All these technologies are all Weighed between reliability and material consumption, wherein mainly interconnection material, such as silver paste, elargol, adhesive and/or weldering Engagement gold.But all these technologies have a major defect, i.e., in the fabrication process to frangible solar battery or institute's shape At the complex process of module, handling up for serial computer (stringer) or matrix machine (composition and transport point forming module) is limited Amount or yield.

Further, since in photovoltaic module different materials different heat expansion coefficient, the stress in module can be with the time It passs and causes failure or defect area.

Summary of the invention

The purpose of the present invention is overcoming these problems and providing a kind of photovoltaic module, which has high stability To resist the stress generated in module, especially because stress caused by the different heat expansion of different materials.It should provide A kind of photovoltaic module, the module can reduce manufacturing cost and guarantee reliable performance.The handling capacity of serial computer or matrix machine It should be improved with yield.Frangible photosensitive part, especially solar battery should obtain in the fabrication process and in use process Protection.

The purpose is realized by photovoltaic module as stated in the beginning, wherein the first complex viscosity is at least 100, 000Pas, more preferably at least 200,000Pas.

The high viscosity of sealant ensures high stability, and prevent component in (for example, due to thermal stress) module each other it Between (part) separation or removal/displacement.Sealant of the invention is held particularly securely electric interconnector against photosensitive part.Sealing The high viscosity of agent material can improve manufacturing process.Mechanical stability allows, especially by raising processing speed, Lai Zengjia machine The handling capacity and yield of device.Moreover, effectively reducing the failure or defect occurred on sealant material during processing.Together When, the mechanical performance of entire photovoltaic module is improved, and also has higher stability at high temperature.Moreover, harder sealing Agent is once attached on solar battery, helps to connectors and battery keeps good electrical contact.

According to the present invention, between 70 DEG C to 100 DEG C at a first temperature of, complex viscosity >=10⁵Pa·s.Form sealing The material of agent has as temperature increases and reduced complex viscosity, therefore has thermoplasticity.As previously mentioned, sealant can also wrap Containing curable components.This (wherein sealant fusing or at least becomes the laminating technology usually executed after serial computer technique Obtain tacky) it is critically important.Due to viscosity with higher within the temperature range of 70 DEG C to 100 DEG C, the behaviour of formed module Work becomes to be more easier, and the mobility of sealant is also smaller, to prevent " battery travelling " phenomenon.Usually with (transparent) The high viscosity sealant that the form of foil provides has very high mechanical stability, and is photosensitive part (usually multiple solar energy Battery) provide reliable mechanical support.The structure of multiple photosensitive parts with high viscosity sealant of the invention ensures Frangible photosensitive part has obtained highly protective in serial computer and matrix machine.In other words: sealant according to the present invention It supports the processing especially in serial computer or matrix machine, and improves handling capacity and yield.

Moreover, high viscosity ensures when in use, the thermal cycle that module (or panel) is passed through not will lead to excessively high Power, the tension may for example make module be layered or disconnect electric connector and battery.

The complex viscosity provided in the application can be determining according to standard ASTM D5289 and/or ASTM D6204, and It is measured under the frequency of 1Hz and 10% strain.Although these standards are related with rubber, defined in test method be suitable for All material described in this application.In principle, complex viscosity can be determined by dynamic mechanical analysis (DMA).

In order to obtain complex viscosity value of the invention, bridging property of the material in thermoplastic property and polymer of sealant is formed It is traded off between energy.It is said in the sense that will lead to viscosity reduction from heating, sealant should be thermoplastic material.It can lead to Selection component, additive and filler are crossed to realize the composition.Those skilled in the art can be by selecting in addition to other selections Molecular weight and/or molecular weight distribution are selected, and/or considers the degree of branching of polymer, and/or adds filler into polymer and (closes Key factor is filler size and shape, the degree of any interaction between packing density and particle), and/or use polymerization Object blend (composition of chemically distinct polymer) etc. come realize/influence complex viscosity value.All of these factors taken together is all to shape At the rheological characteristic of material have an impact.

As starting material, commercially available grade resins can be used for example, may be copolymer.Other are described below (substitution) material or material component.

If material can be preferred by electron radiation or electronic beam curing simultaneously.Here, will crosslinking yield selection For higher than chain rupture yield.

Radiation chemistry man quantifies the chemical yield during radiation treatment usually using G value.Electron beam is can to apply In one of the radiative process of polymer.G value is defined as absorbing the radiation chemistry that the molecular number reacted in energy indicates with every 100eV Yield.G (X) is the chemical yield of crosslinking, and G (S) is the chemical yield of chain rupture.The two processes always coexist under the radiation, hand over The net result of connection comes from the material of G (X)>G (S), and the net result of degradation comes from the material of G (X)<G (S).

Polymer (such as PE) on side with more hydrogen atoms tends to be crosslinked.With methyl polymer (such as Polypropylene), the polymer (such as PTFE) that the polymer (such as polymethacrylates) and perhalogeno element that diyl replaces replace is more It is easy by radiation degradation.

Above-mentioned purpose passes through photovoltaic sealant, especially sealant foil or sealant particle also to realize, wherein sealant By the material with the second complex viscosity is formed with the first complex viscosity and at the second temperature at the first temperature, wherein First complex viscosity is greater than the second complex viscosity, and wherein the first temperature is between 70 DEG C to 100 DEG C and second temperature exists Between 120 DEG C to 160 DEG C, it is characterised in that the first complex viscosity is at least 100,000Pas, preferably at least 200, 000Pa·s。

Above-mentioned purpose is realized also by a kind of method for producing photovoltaic module, method includes the following steps: utilizing root Photosensitive part, such as solar battery or film are sealed according to sealant of the invention, wherein preferably, at least one electric interconnector It is attached to sealant.

The line foil that the invention further relates to a kind of for interconnecting photosensitive part, the line foil include sealant as defined above Material and it is attached to or is embedded in conducting wire in sealant material.

Aforementioned and following embodiment/feature is suitable for " photovoltaic module ", " photovoltaic sealant ", " line foil " in an identical manner " method of production photovoltaic module ".

The sealant of photosensitive part with insertion is preferably by outer layer (such as plate), and preferably glassy layer is clipped in the middle.

In a preferred embodiment, the second complex viscosity is less than 500,000Pas, and preferably less than 100,000Pas, more Preferably less than 50,000Pas.Have (i.e. at a temperature of between 120 DEG C and 160 DEG C) by the second temperature this Complex viscosity, the advantages of can use thermoplasticity (thermal softening) performance.During heating, this point is even more important, so that close Photosensitive part or electric interconnector " can be flowed " or be close to envelope agent --- without leaving the aeriferous intermediate space of packet.

Preferably, the first complex viscosity is than greatly at least 5 times of the second complex viscosity, preferably at least 10 times.In such reality It applies in example, mechanical stability at a temperature of (lower) first is by the appropriate softening of the sealant material under (higher) second temperature It is replaced.

Preferably, the first complex viscosity is than the second complex viscosity greatly at least 10,000Pas, preferably at least 50, 000Pas allows module to be that hard and sealant is easily laminated in use.

Preferably, the second complex viscosity is greater than 5,000Pas, preferably more than 9,000Pas.Such embodiment is also Ensure a degree of mechanical stability during heating process, that is, the material of sealant is indeformable or will not be from interlayer It " is extruded " in structure.

Preferably, the first complex viscosity is less than 1E+10Pas, preferably smaller than 1E+9Pas.This ensures in photovoltaic Some elasticity under the assembled state of module.

Preferably, the first temperature is between 75 DEG C to 95 DEG C, preferably between 80 DEG C to 90 DEG C, wherein preferably first Temperature is 85 DEG C.

Preferably, second temperature is between 125 DEG C to 155 DEG C, preferably between 130 DEG C to 150 DEG C, wherein preferably Second temperature is 140 DEG C.

Preferably, sealant is directly contacted at least one photosensitive part, and/or wherein sealant is protected on photosensitive part At least one electric interconnector is held, and/or wherein sealant is provided in the form of foil and/or particle.

In a preferred embodiment, at least one, preferably multiple electric interconnectors for interconnection solar cells it is attached To sealant.In this embodiment, sealant is preferably the foil for keeping connectors (one or more).Connectors can be by adding It melts or sealant is attached to by adhesive in (part) of thermally-induced sealant.Such sealant foil e.g. exists Sealant foil disclosed in EP1547158B1.This combination of sealing foil and connectors can also make within the scope of the invention With.Therefore, EP1547158B1 disclosure is incorporated by reference in the application.

Preferably, electric interconnector is diameter less than 1,000 μm, even more preferably less than 500 μm, such as 100 to 300 μm Conducting wire, it is therefore preferable to round conductor.

Particle means any particle form.Preferably, the diameter of particle is less than 10mm, preferably less than 5mm.Particle is excellent Selection of land is generated by manufacturing process, generally includes synthesis or mixing step to add additive, thus chemistry and object needed for obtaining Rationality matter.

In a preferred embodiment, the following steps are included: forming lamination, which includes at least outside first the manufacturing method The first sealant layer and the second outer layer of layer, particle form；And it is (and preferably true in heating preferably in laminating machine It is empty) under the conditions of lamination is pressed together to form laminate.The sealant of particle form can apply in a structured manner.

The concept of particle (as the substituted or supplemented of foil) is used for example to disclose in WO2015/056069A1, this application Disclosure be incorporated by reference in the application.

Preferably, the material of sealant has thermoplasticity.As described above, thermoplasticity (thermal softening) performance is for seal process It is critically important.

Certainly, the material of sealant can be for example through electron beam curable.

Preferably, the material of sealant includes low density polyethylene (LDPE) (LDPE) material or linear low density polyethylene (LLDPE) material or medium density polyethylene (MDPE) material.

Preferably, sealant is by polyethylene terephthalate (PET) and/or polyolefin (PO) and/or ethyl vinyl acetate Vinyl acetate (EVA) and/or ionomer and/or polyvinyl butyral (PVB) formation.

Preferably, the density for forming the material of sealant is less than 1.5g/cm³, and preferably more than 0.7g/cm³。

Preferably, sealant is thickness between 10 μm to 500 μm, the layers of foil preferably between 40 μm to 400 μm, And/or wherein for the wavelength of visible spectrum, it is transparent that sealant is at least 50%.

In the following, it is described that other advantageous features of sealant material:

Preferably, preferably after laminated module, at room temperature, stripping of the sealant to photosensitive part (one or more) It is at least 5N/cm under 90 ° of angle from power.

Preferably, preferably before laminated module, at room temperature, sealant is to electric (conducting wire) connectors (one or more It is a) peeling force under 180 ° of angle be at least 50mN/ conducting wire.

In order to form sealant, LDPE and LLDPE may be used as single layer, but the LDPE with MDPE be also used as it is double Layer, wherein LDPE serves as adhesive.Every layer (single layer) can be handled with electron beam, to assign its correct performance.

For certain sealing agent addition agents, give some density values: the density of PET is about 1.38g/cm³；PO (polyene Hydrocarbon, including be used as electrode foil PE) density in 0.91-0.97g/cm³Between, the density of EVA is down to 0.85g/cm³, ionomer Density in 0.94-0.95g/cm³, the density of PVB is 1-1.05g/cm³。

The shrinking percentage of sealant preferably < 5%, more preferably < 3%, most preferably < 0.5%.Shrinking percentage pass through by Sealant (foil) is heated to 160 DEG C and measures for 30 minutes.Then, it is surveyed in machine and transverse direction before and after heat treatment Measure its size.

Detailed description of the invention

The other embodiment of the present invention is indicated in attached drawing and dependent claims.List of reference signs constitutes the disclosure A part.The present invention will be explained in detail by attached drawing now.In the accompanying drawings:

Fig. 1 shows the photovoltaic module before lamination process formed by serial computer or matrix machine,

Fig. 2 shows the photovoltaic module with the photosensitive part being fully sealed and after lamination process,

Fig. 3 shows the embodiment of the sealant of foil form, and wherein electric interconnector (in the form of conducting wire) is attached to thereon,

Fig. 4 shows the complex viscosity to form the possibility material (sample 1 to 3) of sealant of the present invention,

Fig. 5 shows the lamination of photosensitive part, wherein photosensitive part by with electric interconnector sealant foil covering and Further covered by external sealant foil.

Specific embodiment

Fig. 1 shows photovoltaic module 1 comprising covers photosensitive portion as the solar battery of photosensitive part 2 and from two sides The sealant 3 of part 2.Here, sealant is provided in the form of foil.However, it is also possible to be arranged in particle as sealant material The following above and of photosensitive part 2 (as disclosed in WO2015/056069A1).

The sealant 3 of photosensitive part 2 with insertion is clipped in the middle in two sides by outer layer 4.Outer layer 4 is usually glass plate.

Fig. 2 shows the modules 1 after lamination, and wherein photosensitive part is completely sealed.

Fig. 5 is shown in which the embodiment using sealant 3 and 3 '.Sealant 3 ' is the sealant with electric interconnector 5 Paillon (for example, as shown in Figure 3).Sealant 3 covers sealant 3 '.In alternative embodiments, sealant 3 ' can be used only, That is, not using additional sealant 3.The present invention relates to the sealant (foil) with electric interconnector and without the close of electric interconnector It seals agent (foil).

Sealant 3,3 ' is by the first temperature with the first complex viscosity and at the second temperature with the second plural number The material of viscosity is formed.First complex viscosity is greater than the second complex viscosity.First temperature is the temperature between 70 DEG C to 100 DEG C, Second temperature is the temperature between 120 DEG C to 160 DEG C.First temperature must be understood as having between 70 DEG C and 100 DEG C The discrete temperature (not being temperature range) of value, such as 85 DEG C.Equally, second temperature must be understood as having at 120 DEG C and 160 The discrete temperature (not being temperature range) of value between DEG C, such as 140 DEG C.

According to the present invention, the first complex viscosity is at least 100,000Pas, preferably at least 200,000Pas.Such as It has been mentioned that the high viscosity of sealant material can improve manufacturing process.Mechanical stability allows at especially by raising Manage handling capacity and yield that speed increases machine.Furthermore, it is possible to efficiently reduce the failure occurred on sealant material or lack It falls into.Meanwhile the mechanical performance of entire photovoltaic module is improved, and also has higher stability at high temperature.

Fig. 4 shows relationship of the complex viscosity (y-axis is log10 scale) of three samples with temperature.Sample is by with copolymerization Low density polyethylene (LDPE) (LDPE) the material preparation that object form provides.It is enterprising in polymer base that viscosity has passed through additive/filler Optimization is gone.The principal element for influencing material flowing deformation performance is mentioned above.

In material shown in Fig. 4, in the entire temperature range from 70 DEG C to 100 DEG C, complex viscosity is greater than 100, 000Pa·s。

Second complex viscosity is less than 500,000Pas, and preferably less than 100,000Pas, even more preferably less than 50, 000Pa·s。

From the sample of Fig. 4 as can be seen that the first complex viscosity (here even than greatly at least 5 times of the second complex viscosity At least 10 times).

Preferably, the second complex viscosity is also greater than 5,000Pas, preferably more than 9,000Pas.

First complex viscosity can be less than 1E+10Pas, preferably less than 1E+9Pas.

First temperature can be further defined as have between 75 DEG C and 95 DEG C, be preferably ranges between 80 DEG C and 90 DEG C it Between value.In most preferred embodiment, the first temperature is 85 DEG C.

Second temperature can be further defined as having between 125 DEG C and 155 DEG C, be preferably ranges between 130 DEG C and 150 Value between DEG C.In most preferred embodiment, the first temperature is 140 DEG C.

As can be seen that sealant 3 is directly contacted with photosensitive part 2 from Fig. 1 and Fig. 2.In the fig. 3 embodiment, foil is close Envelope agent 3' keeps electric interconnector 5 in the form of parallel wire or parallel band (for interconnecting optical component 2).In prefabrication step In, interconnector conducting wire is attached to by way of adhesive or so that sealant material is become sticky by (part) heating process close Seal foil.Under this prefabrication state, sealant 3'(has integrated connectors 5) it is disposed on photosensitive part 2.It can be with this Mode constructs complete string even matrix, then places it in lamination as shown in Figure 1.

From fig. 4, it can be seen that the material of sealant 3 has thermoplasticity, that is, the material softens as the temperature rises.

The material of sealant 3 can be by low density polyethylene (LDPE) (LDPE) material and/or linear low density polyethylene (LLDPE) Material and/or medium density polyethylene (MDPE) material are formed, or include low density polyethylene (LDPE) (LDPE) material and/or linear low Density polyethylene (LLDPE) material and/or medium density polyethylene (MDPE) material.

Particularly, sealant 3 can be by polyethylene terephthalate (PET) and/or polyolefin (PO) and/or second Alkene-vinylacetate (EVA) and/or ionomer and/or polyvinyl butyral (PVB) formation.

Preferably, sealant is by polyethylene terephthalate (PET) and/or polyolefin (PO) and/or ethyl vinyl acetate Vinyl acetate (EVA) and/or ionomer and/or polyvinyl butyral (PVB) formation.

The density for forming the material of sealant 3 can be less than 1.5g/cm³, and preferably more than 0.7g/cm³。

Sealant 3 can be thickness between 10 μm to 500 μm, the layers of foil (figure preferably between 40 μm to 400 μm 1).It is preferred if sealant 3 is at least the wavelength of visible spectrum 50% transparent.

The method of photovoltaic module 1 is produced the following steps are included: sealing photosensitive part 2, such as solar battery with sealant 3 Or film etc., wherein preferably, at least one electric interconnector 5 is attached to sealant 3.

Before sealant 3 is arranged at least one photosensitive part 2, the attachment of at least one connectors 5 is completed.

The present invention is not limited to these Examples.To those skilled in the art, other modifications will be apparent, And it is considered in the scope of the present invention as set forth in the appended claims.In all parts of above instructions, Especially relative to the single feature of attached drawing description, can be combined with each other to form other embodiments, and/or suitably modified In the case of be suitable for claims and specification rest part, even if these are characterized in describing relative to other features , it also can satisfy above-mentioned condition.

Reference signs list

1 photovoltaic module

2 photosensitive parts

3 sealants

4 outer layers

5 electric interconnectors