CN104952951A - Solar cell structure, manufacturing method thereof and solar cell module - Google Patents
Solar cell structure, manufacturing method thereof and solar cell module Download PDFInfo
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- CN104952951A CN104952951A CN201410196388.7A CN201410196388A CN104952951A CN 104952951 A CN104952951 A CN 104952951A CN 201410196388 A CN201410196388 A CN 201410196388A CN 104952951 A CN104952951 A CN 104952951A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000007650 screen-printing Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005382 thermal cycling Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention discloses a solar cell structure, a manufacturing method thereof and a solar cell module. The solar cell structure comprises a substrate, a first electrode and a second electrode. The first electrode is disposed on the first surface of the substrate and includes at least one first bus electrode, a plurality of finger electrodes, and a plurality of first auxiliary electrodes. The first bus electrode intersects the finger electrode and does not intersect the first auxiliary electrode. The second electrode is arranged on the second surface of the substrate and comprises at least one second bus electrode. The second bus electrode comprises a plurality of electrode parts corresponding to the first auxiliary electrode. The electrode parts are arranged at intervals, and the orthographic projection of the electrode parts to the first surface is overlapped with the first bus electrode. The finger electrodes comprise a plurality of first finger electrodes which are intersected with the orthographic projection of the electrode part. Each first auxiliary electrode is positioned beside the orthographic projection of the corresponding electrode part and is intersected with the first finger electrode.
Description
Technical field
The invention relates to a kind of photoelectric conversion device, and relate to a kind of solar battery structure and manufacture method thereof especially.
Background technology
After solar module completes making, usually need carry out reliability-test to it, to guarantee the specification of produced solar module by International Certification and customer requirement.Generally speaking, the reliability-test of solar module mainly comprises visual examination (visual inspection), Insulation test, low-light (level) performance test, outdoor exposure test, hot spot long duration test, uv test, thermal cycle (thermal cycling) is tested, humidity freeze (humidity freeze) is tested, damp and hot (damp heat) tests, lead end is tested, wet leakage current is tested, mechanical load (mechanical load) is tested, hail is tested and optical attenuation is tested etc.
But after thermal cycling test, often there is the situation that fill factor, curve factor (fill factor) declines in solar module, and then causes peak power output to reduce.Please refer to Fig. 1, it is the upper schematic diagram illustrating a kind of conventional solar cell.After analyzing the solar cell 100 in the solar module after going through thermal cycling test, find that the finger electrode 106 being positioned at front 102 upper part of solar cell 100 has breakage.And the breakage of finger electrode 106 occurs in the corresponding part in electrode section 110 position with the bus electrode 108 at solar cell 100 back side.Due to the breakage of finger electrode 106, these finger electrodes 106 effectively cannot be connected with bus electrode 104, thus cause the electric current collected by finger electrode 106 cannot transmit smoothly and be pooled to bus electrode 104, and then cause the power output of solar cell 100 to decline.
Summary of the invention
Therefore, an object of the present invention is exactly providing a kind of solar battery structure and manufacture method thereof and solar module, one surface of its substrate is provided with crossing with finger electrode but disjoint with bus electrode several auxiliary electrode, and the electrode section of the bus electrode on another surface of these auxiliary electrodes and substrate is corresponding.When finger electrode breaks and electric current cannot be directly conducted to bus electrode, via the conduction of these auxiliary electrodes, the electric current of finger electrode can be pooled to bus electrode smoothly.Therefore, the loss of fill factor, curve factor can be reduced, and then the energy conversion efficiency of solar cell can be promoted.
Another object of the present invention is providing a kind of solar battery structure and manufacture method thereof and solar module, it comprises the several pilot wires that may correspond to and connect bus electrode and auxiliary electrode, therefore further protection can be provided, with when the electric current that finger electrode transmits cannot be reached bus electrode by auxiliary electrode smoothly, electric current is pooled to bus electrode smoothly.In addition, pilot wire is wide compared with finger electrode, can promote corresponding to the joint steadiness between the finger electrode of electrode section part and bus electrode, and can avoid the bond breakage between finger electrode and bus electrode.
According to above-mentioned purpose of the present invention, a kind of solar battery structure is proposed.This solar battery structure comprises substrate, the first electrode and the second electrode.Substrate has relative first surface and second surface.First electrode is located on first surface, and comprises at least one first bus electrode, multiple finger electrode and multiple first auxiliary electrode, and wherein finger electrode is crossing with the first bus electrode, the first auxiliary electrode and the first bus electrode non-intersect.Second electrode is located on second surface, and comprises at least one second bus electrode.Second bus electrode comprises the multiple electrode section corresponding with aforementioned first auxiliary electrode, wherein these electrode section are spaced along the bearing of trend of the first bus electrode, each electrode section is overlapping with the first bus electrode to the orthographic projection of first surface, and non-described orthographic projection is on bearing of trend and forms multiple interval in addition.Multiple first finger electrode is comprised in aforementioned finger electrode, these first finger electrodes are crossing with the orthographic projection of electrode section, each first auxiliary electrode is positioned at by the side of the orthographic projection of corresponding electrode section, and first finger electrode crossing with corresponding orthographic projection intersects.
According to one embodiment of the invention, also comprise multiple second finger electrode in above-mentioned finger electrode and be arranged in interval, one end of each the first auxiliary electrode is stretched in the interval of one end of contiguous corresponding orthographic projection, and crossing with the second finger electrode being adjacent to corresponding orthographic projection in the interval of institute's projection.
According to another embodiment of the present invention, the other end of each the first auxiliary electrode above-mentioned is stretched in the interval of the other end of contiguous corresponding orthographic projection, and crossing with the second finger electrode being adjacent to corresponding orthographic projection in the interval of institute's projection.
According to another embodiment of the present invention, above-mentioned first electrode also comprises multiple first pilot wires corresponding with the first auxiliary electrode, and each first pilot wire connects the first corresponding auxiliary electrode and the first bus electrode.
According to one more embodiment of the present invention, the width of each the first pilot wire above-mentioned is greater than the width of each finger electrode.
According to one more embodiment of the present invention, above-mentioned first electrode also comprises multiple second auxiliary electrode, wherein these second auxiliary electrodes and the first bus electrode non-intersect, and corresponding with the first auxiliary electrode, each second auxiliary electrode and the first corresponding auxiliary electrode lay respectively at relative two sides of the orthographic projection of corresponding electrode section.
According to one more embodiment of the present invention, above-mentioned first electrode also comprises multiple second pilot wires corresponding with the second auxiliary electrode, and each second pilot wire connects the second corresponding auxiliary electrode and the first bus electrode.
According to one more embodiment of the present invention, each second auxiliary electrode above-mentioned and the first corresponding auxiliary electrode lay respectively at the outside at relative two edges along bearing of trend of the orthographic projection of corresponding electrode section.
According to above-mentioned purpose of the present invention, a kind of solar module of another proposition.This solar module comprises a upper plate, a lower plate, a solar battery structure described above, multiple connecting band and at least one encapsulating material layer.Solar battery structure is located between upper plate and lower plate.Connecting band is electrically connected adjacent solar battery structure.Solar battery structure, between upper plate and lower plate, is combined with upper plate and lower plate by encapsulating material layer.
According to above-mentioned purpose of the present invention, also propose a kind of manufacture method of solar battery structure, comprise the following step.There is provided a substrate, this substrate has relative first surface and second surface.Form one first electrode on first surface, wherein the first electrode comprises at least one first bus electrode, multiple finger electrode and multiple first auxiliary electrode, these finger electrodes are crossing with the first bus electrode, and the first auxiliary electrode and the first bus electrode non-intersect.Form one second electrode on second surface, wherein the second electrode comprises at least one second bus electrode, and it is corresponding with aforementioned first auxiliary electrode that the second bus electrode comprises multiple electrode section.These electrode section are spaced along the bearing of trend of the first bus electrode, and each electrode section is overlapping with the first bus electrode to the orthographic projection of first surface, and non-described orthographic projection is on bearing of trend and forms multiple interval in addition.Comprise multiple first finger electrode in finger electrode, these first finger electrodes are crossing with the orthographic projection of electrode section, and each first auxiliary electrode is positioned at by the side of the orthographic projection of corresponding electrode section, and first finger electrode crossing with corresponding orthographic projection intersects.
According to one embodiment of the invention, the step of above-mentioned formation first electrode also comprises makes above-mentioned finger electrode comprise multiple second finger electrode, these the second finger electrodes are arranged in the interval of electrode section, one end of each the first auxiliary electrode is stretched in the interval of one end of contiguous corresponding orthographic projection, and crossing with the second finger electrode being adjacent to corresponding orthographic projection in the interval of institute's projection.
According to another embodiment of the present invention, the other end of each the first auxiliary electrode above-mentioned is stretched in the interval of the other end of contiguous corresponding orthographic projection, and crossing with the second finger electrode being adjacent to corresponding orthographic projection in the interval of institute's projection.
According to another embodiment of the present invention, the step of above-mentioned formation first electrode also comprises makes the first electrode comprise multiple first pilot wires corresponding with the first auxiliary electrode, and each first pilot wire connects the first corresponding auxiliary electrode and the first bus electrode.
According to one more embodiment of the present invention, the width of each the first pilot wire above-mentioned is greater than the width of each finger electrode.
According to one more embodiment of the present invention, the step of above-mentioned formation first electrode also comprises makes the first electrode comprise multiple second auxiliary electrode, these second auxiliary electrodes and the first bus electrode non-intersect, and corresponding with above-mentioned first auxiliary electrode, each second auxiliary electrode and the first corresponding auxiliary electrode lay respectively at relative two sides of the orthographic projection of corresponding electrode section.
According to one more embodiment of the present invention, the step of above-mentioned formation first electrode also comprises makes the first electrode comprise multiple second pilot wires corresponding with the second auxiliary electrode, and each second pilot wire connects the second corresponding auxiliary electrode and the first bus electrode.
According to one more embodiment of the present invention, each second auxiliary electrode above-mentioned and the first corresponding auxiliary electrode lay respectively at the outside at relative two edges along bearing of trend of the orthographic projection of corresponding electrode section.
Accompanying drawing explanation
For above and other object of the present invention, feature, advantage and embodiment can be become apparent, appended the description of the drawings is as follows:
Fig. 1 is the upper schematic diagram illustrating a kind of conventional solar cell;
Fig. 2 is the generalized section of a kind of solar module illustrated according to one embodiment of the present invention;
Fig. 3 is the upper schematic diagram of a kind of solar battery structure illustrated according to one embodiment of the present invention;
Fig. 4 is the partial enlargement upper schematic diagram of a kind of solar battery structure illustrated according to one embodiment of the present invention;
Fig. 5 is the upper schematic diagram of a kind of solar battery structure illustrated according to another embodiment of the present invention;
Fig. 6 is the partial enlargement upper schematic diagram of a kind of solar battery structure illustrated according to another embodiment of the present invention;
Fig. 7 is the Making programme figure of a kind of solar battery structure illustrated according to one embodiment of the present invention.
Embodiment
Please refer to Fig. 2, it is the generalized section of a kind of solar module illustrated according to one embodiment of the present invention.In the present embodiment, solar module 200 mainly comprises upper plate 218, lower plate 220, several solar battery structure 202a, several connecting band 230 and one or more encapsulating material layer 222.
In certain embodiments, upper plate 218 is clear sheet, such as glass.Lower plate 220 can be described as again backboard (back sheet), and lower plate 220 can be White-opalescent sheet material.Solar battery structure 202a is located between upper plate 218 and lower plate 220.Connecting band 230 is same between upper plate 218 and 220, and two ends of each connecting band 230 can be connected with two adjacent solar battery structure 202a respectively, to be electrically connected this two solar battery structure 202a.Connecting band 230 also can be described as welding.Encapsulating material layer 222 is also between upper plate 218 and lower plate 220.By the program of high-temperature laminating, these solar battery structures 202a and connecting band 230 can be combined with lower plate 220 and upper plate 218 by encapsulating material layer 222 when molten state.In an illustrative example, encapsulating material layer 222 is ethylene-vinyl acetate copolymer (EVA).
Referring to Fig. 2 to Fig. 4, wherein Fig. 3 and Fig. 4 illustrates upper schematic diagram according to a kind of solar battery structure of one embodiment of the present invention and partial enlargement upper schematic diagram respectively.In certain embodiments, solar battery structure 202a mainly comprises substrate 204, first electrode 210a and the second electrode 214.As shown in Figure 2, substrate 204 has first surface 206 and second surface 208, and wherein first surface 206 and second surface 208 lay respectively at relative two sides of substrate 204.The material of substrate 204 can be semi-conducting material, such as silicon.Substrate 204 is provided with corresponding doped region (not illustrating) according to the first electrode 210a with the position of the second electrode 214.In an illustrative example, first surface 206 is the front of substrate 204, and second surface 208 is the back side of substrate 204.
As shown in Figure 3, the first electrode 210a is arranged on the first surface 206 of substrate 204.The material of the first electrode 210a can be metal paste, such as silver slurry.In certain embodiments, the first electrode 210a comprises one or more first bus electrode 212, several auxiliary electrode and several finger electrode.In an illustrative example, as shown in Figure 3, the first electrode 210a comprises three the first bus electrodes 212.It is wide that finger electrode comprises several first finger electrode 224a and several second finger electrode 224b, these the first finger electrode 224a and the second finger electrode 224b essence.First finger electrode 224a is crossing with the second finger electrode 224b and the first bus electrode 212, and namely these first finger electrodes 224a directly engages with the second finger electrode 224b at least with the first bus electrode 212.In some illustrative example, each first finger electrode 224a is orthogonal with the second finger electrode 224b and the first bus electrode 212.In addition, as shown in Figure 4, the width 254 of each first finger electrode 224a and the second finger electrode 224b is less than the width 256 of the first bus electrode 212.The electric current of the first finger electrode 224a and the second finger electrode 224b can be pooled to the first bus electrode 212.
In certain embodiments, in auxiliary electrode, only comprise several first auxiliary electrode 226a, and the several first auxiliary electrode 226a of the other corresponding configuration of each first bus electrode 212.In such embodiments, the first auxiliary electrode 226a all can be positioned at the same side of the first corresponding bus electrode 212; Right first auxiliary electrode 226a also non-ly all can be configured in the same side of the first corresponding bus electrode 212, but is configured in relative two sides of the first corresponding bus electrode 212.For example, only comprise the first auxiliary electrode 226a and the first electrode 210a is in the embodiment made in wire mark mode at the first electrode 210a, the screen printing processing that the first auxiliary electrode 226a all can be arranged on the first corresponding bus electrode 212 enters cutter side.In addition, first bus electrode 212 of the first auxiliary electrode 226a all with corresponding is non-intersect.In some instances, the first auxiliary electrode 226a all extends along the bearing of trend 236 of the first bus electrode 212 of correspondence.In some illustrative example, the first bus electrode 212 of the parallel correspondence of the first auxiliary electrode 226a.In other illustrative example, the first auxiliary electrode 226 is not parallel with the first corresponding bus electrode 212.
In further embodiments, as shown in Figure 3, several first auxiliary electrode 226a and several second auxiliary electrode 226b in auxiliary electrode, is comprised, and the other corresponding configuration several first auxiliary electrode 226a and several second auxiliary electrode 226b of each first bus electrode 212.In such embodiments, these first auxiliary electrodes 226a is corresponding with the second auxiliary electrode 226b respectively.The first auxiliary electrode 226a in correspondence with each other and the second auxiliary electrode 226b are adjacent to relative two sides of the first corresponding bus electrode 212 respectively.In addition, the first auxiliary electrode 226a and the second auxiliary electrode 226b the first bus electrode 212 all with corresponding is non-intersect.In some instances, the first auxiliary electrode 226a and the second auxiliary electrode 226b all extends along the bearing of trend 236 of the first bus electrode 212.In some illustrative example, the first auxiliary electrode 226a and all parallel the first corresponding bus electrode 212 of the second auxiliary electrode 226b.In other illustrative example, the first auxiliary electrode 226a and the second auxiliary electrode 226b and the first corresponding bus electrode 212 not parallel.The following embodiment comprising the first auxiliary electrode 226a and the second auxiliary electrode 226b with the first electrode 210a is to carry out description of the present embodiment.
As shown in Figure 2, the second electrode 214 is located on the second surface 208 of substrate 204, and lays respectively at relative two sides of substrate 204 with the first electrode 214.The material of the second electrode 214 can be metal paste, such as silver slurry.Second electrode 214 comprises one or more the second bus electrode 216.In certain embodiments, as shown in Figure 3, the quantity of the second bus electrode 216 is corresponding with position all with the first bus electrode 212.Each second bus electrode 216 comprises several electrode section 232.Therefore, the orthographic projection of each electrode section 232 pairs of first surfaces 206 is overlapping with the first corresponding bus electrode 212.In each second bus electrode 216, these electrode section 232 are spaced along the bearing of trend 236 of the first bus electrode 212, and namely each second bus electrode 216 is in discontinuous shape.The bearing of trend 236 so making the orthographic projection in non-electrode portion 232 be in the first bus electrode 212 forms interval 234.
In addition, in all finger electrodes of the first electrode 210a, the first finger electrode 224a is crossing with the orthographic projection of electrode section 232 on first surface 206 of the second bus electrode 216.On the other hand, the second finger electrode 224b is then through in above-mentioned interval 234.Referring to Fig. 3 and Fig. 4, the first auxiliary electrode 226a of the first electrode 210a is corresponding with the electrode section 232 of the second bus electrode 216 respectively with the second auxiliary electrode 226b.That is each electrode section 232 is corresponding with one first auxiliary electrode 226a and one second auxiliary electrode 226b, and the first auxiliary electrode 226a and the second auxiliary electrode 226b lay respectively at corresponding electrode section 232 by relative two sides of the orthographic projection of first surface 206.In an illustrative example, first auxiliary electrode 226a and the second auxiliary electrode 226b lay respectively at the outside of corresponding electrode section 232 at relative two edges along bearing of trend 236 of the orthographic projection of first surface 206, and namely the first auxiliary electrode 226a and the second auxiliary electrode 226b are all greater than the distance of electrode section 232 first bus electrode 212 extremely corresponding respectively at two edges along bearing of trend 236 of the orthographic projection of first surface 206 respectively to the distance of the first corresponding bus electrode 212.
Please referring again to Fig. 2 and Fig. 4, in some illustrative example, first auxiliary electrode 226a and the second auxiliary electrode 226b lays respectively at outside two edges of the connecting band 230 of fitting with the first bus electrode 212, and the distance of so far the first bus electrode 212 is distinguished at two edges that namely the first auxiliary electrode 226a and the second auxiliary electrode 226b are all greater than the connecting band 230 of fitting with the first bus electrode 212 to the distance of corresponding the first bus electrode 212 respectively.
As shown in Figure 4, for each electrode section 232, correspondence be arranged on the first auxiliary electrode 226a of relative two sides of its orthographic projection and the second auxiliary electrode 226b all with and crossing the first finger electrode 224a of this orthographic projection crossing.In certain embodiments, for the orthographic projection of each electrode section 232 on first surface 206, one end 238 that correspondence is arranged on the first other auxiliary electrode 226a of this orthographic projection is stretched in the interval 234 of one end of this orthographic projection contiguous, and and in the interval 234 of institute's projection the second finger electrode 224b of this orthographic projection contiguous crossing.In further embodiments, for the orthographic projection of each electrode section 232 on first surface 206, the other end 240 that correspondence is arranged on the first other auxiliary electrode 226a of this orthographic projection is stretched in the interval 234 of the other end of this orthographic projection contiguous, and and in the interval 234 of institute's projection the second finger electrode 224b of this orthographic projection contiguous crossing.That is, the length 248 of the electrode section 232 that the length 246 of the first auxiliary electrode 226a is more corresponding is long, as shown in Figure 4.
Similar, in certain embodiments, for the orthographic projection of each electrode section 232 on first surface 206, one end 242 that correspondence is arranged on the second other auxiliary electrode 226b of this orthographic projection is stretched in the interval 234 of one end of this orthographic projection contiguous, and and in the interval 234 of institute's projection the second finger electrode 224b of this orthographic projection contiguous crossing.In further embodiments, for the orthographic projection of each electrode section 232 on first surface 206, the other end 244 that correspondence is arranged on the second other auxiliary electrode 226b of this orthographic projection is stretched in the interval 234 of the other end of this orthographic projection contiguous, and and in the interval 234 of institute's projection the second finger electrode 224b of this orthographic projection contiguous crossing.Namely the length 248 of the electrode section 232 that the length 250 of the second auxiliary electrode 226b is more corresponding is long, as shown in Figure 4.
In solar battery structure 202a, when the first finger electrode 224a of the first electrode 210a breaks because of thermal stress impact, and then when effectively cannot be communicated with the first bus electrode 212, the electric current of the first finger electrode 224a can be conducted to the first bus electrode 212 by the first auxiliary electrode 226a and the second auxiliary electrode 226b smoothly that be arranged on orthographic projection two side of the electrode section 232 of the second bus electrode 216.Therefore, can effectively avoid fill factor, curve factor to decline, and then the power output of solar battery structure 202a can be improved.
Referring to Fig. 5 and Fig. 6, it illustrates upper schematic diagram according to a kind of solar battery structure of another embodiment of the present invention and partial enlargement upper schematic diagram respectively.The framework of the solar battery structure 202b of present embodiment is identical with the framework of the solar battery structure 202a of above-mentioned execution mode haply, and the difference of the two is that the first electrode 210b separately comprises several pilot wire.
Only comprise in the embodiment of the first auxiliary electrode 226a at the first electrode 210b, the first electrode 210b separately comprises several first pilot wire 228a.These first pilot wires 228a is corresponding with the first auxiliary electrode 226a respectively, and each first pilot wire 228a connects the first corresponding auxiliary electrode 226a and the first bus electrode 212.In some illustrative example, as shown in Figure 6, the width 252 of the first pilot wire 228a is greater than the width 254 of each first finger electrode 224a and the second finger electrode 224b, to make the joint between the first pilot wire 228a and the first bus electrode 212 more solid and reliable, and the structural strength of the first electrode 210b and the second bus electrode 216 corresponding region can be promoted, reduce the probability of bond breakage between the first finger electrode 224a and the first bus electrode 212.
Comprise in the embodiment of the first auxiliary electrode 226a and the second auxiliary electrode 226b at the first electrode 210b, as shown in Figure 5, the first electrode 210b also comprises several second pilot wire 228b simultaneously.These second pilot wires 228b is corresponding with the second auxiliary electrode 226b respectively, and each second pilot wire 228b connects the second corresponding auxiliary electrode 226b and the first bus electrode 212.In some illustrative example, as shown in Figure 6, the width 258 of the second pilot wire 228b is equally also greater than the width 254 of each first finger electrode 224a and the second finger electrode 224b, to promote the solid and reliable degree engaged between the second pilot wire 228b with the first bus electrode 212, and relatively can increase the structural strength of the first electrode 210b and the second bus electrode 216 corresponding region, reduce the probability of bond breakage between the first finger electrode 224a and the first bus electrode 212.
Please with reference to Fig. 2 to Fig. 4 and Fig. 7, wherein Fig. 7 is the Making programme figure of a kind of solar battery structure illustrated according to one embodiment of the present invention.In the present embodiment, when making solar cell, such as, during the solar battery structure 202a of above-mentioned execution mode, as described in step 300, can first provide substrate 204, as shown in Figure 2.Substrate 204 has relative first surface 206 and second surface 208.In addition, substrate 204 is provided with corresponding doped region (not illustrating) according to the first electrode 210a with the position of the second electrode 214.
Next, as described in step 302, the first electrode 210a can be formed on the first surface 206 of substrate 204.In certain embodiments, the first electrode 210a comprise one or more first bus electrode 212, several auxiliary electrode, with several finger electrode.Such as one or more screen printing processings can be utilized when forming the first electrode 210a, and adopt various print order.For example, according to process requirement, and can first print finger electrode, republish the first bus electrode 212, then print auxiliary electrode; Or first print the first bus electrode 212, republish finger electrode, then print auxiliary electrode; Or first print finger electrode, republish auxiliary electrode, then print the first bus electrode 212; Or with in screen printing processing, print the first bus electrode 212, finger electrode and auxiliary electrode simultaneously.
Finger electrode comprises several first finger electrode 224a and several second finger electrode 224b.First finger electrode 224a is crossing with the second finger electrode 224b and the first bus electrode 212.In certain embodiments, several first auxiliary electrode 226a in auxiliary electrode, only can be comprised, and the several first auxiliary electrode 226a of the other corresponding configuration of each first bus electrode 212.First bus electrode 212 of the first auxiliary electrode 226a all with corresponding is non-intersect.In some illustrative example, the screen printing processing that the first auxiliary electrode 226a all can be arranged on the first corresponding bus electrode 212 enters cutter side.In addition, the first auxiliary electrode 226a can extend along the bearing of trend 236 of the first bus electrode 212 of correspondence.
In further embodiments, as shown in Figure 3, several first auxiliary electrode 226a and several second auxiliary electrode 226b in auxiliary electrode, is comprised, and the other corresponding configuration several first auxiliary electrode 226a and several second auxiliary electrode 226b of each first bus electrode 212.First auxiliary electrode 226a and the second auxiliary electrode 226b are in correspondence with each other and be adjacent to relative two sides of the first bus electrode 212 respectively.First auxiliary electrode 226a and the second auxiliary electrode 226b the first bus electrode 212 all with corresponding is non-intersect, and can extend along the bearing of trend 236 of the first bus electrode 212.
Next, as described in step 304, the second electrode 214 can be formed on the second surface 208 of substrate 204, as shown in Figure 2.In certain embodiments, the second electrode 214 comprises one or more the second bus electrode 216.Such as screen printing processing can be utilized when forming the second electrode 214.As shown in Figure 3, the quantity of the second bus electrode 216 is corresponding with position all with the first bus electrode 212.In addition, each second bus electrode 216 comprises several electrode section 232.Therefore, the orthographic projection of each electrode section 232 pairs of first surfaces 206 is overlapping with the first corresponding bus electrode 212.The electrode section 232 of each second bus electrode 216 is spaced along the bearing of trend 236 of the first bus electrode 212, and the bearing of trend 236 thus making the orthographic projection in non-electrode portion 232 be in the first bus electrode 212 has interval 234.
In another embodiment, when forming the first electrode 210a and the second electrode 214, also first can form the second electrode 214 on the second surface 208 of substrate 204, then form the first electrode 210a on the first surface 206 of substrate 204.
In the step of formation first electrode 210a and the second electrode 214, comprise and make the first finger electrode 224a of the first electrode 210a crossing with the orthographic projection of electrode section 232 on first surface 206 of the second bus electrode 216 of the second electrode 214, and make the second finger electrode 224b be arranged in above-mentioned interval 234.In addition, as shown in Figure 3 and Figure 4, each electrode section 232 is corresponding with one first auxiliary electrode 226a and one second auxiliary electrode 226b, first auxiliary electrode 226a and the second auxiliary electrode 226b lay respectively at corresponding electrode section 232 by relative two sides of the orthographic projection of first surface 206, and the first auxiliary electrode 226a and the second auxiliary electrode 226b all with and crossing the first finger electrode 224a of this orthographic projection crossing.
In certain embodiments, when making the first electrode 210a, the one end 238 of the first auxiliary electrode 226a making correspondence be arranged on the orthographic projection of each electrode section 232 other is stretched in the interval 234 of one end of this orthographic projection contiguous with one end 242 of the second auxiliary electrode 226b, and therewith in interval 234 second finger electrode 224b of contiguous orthographic projection crossing.In further embodiments, when making the first electrode 210a, the other end 240 of the first auxiliary electrode 226a more making correspondence be arranged on the orthographic projection of each electrode section 232 other is stretched in the interval 234 of the other end of this orthographic projection contiguous with the other end 244 of the second auxiliary electrode 226b, and in this interval 234, second finger electrode 224b of contiguous orthographic projection is crossing.That is as shown in Figure 4, the length 248 of the electrode section 232 that the length 246 of the first auxiliary electrode 226a is all more corresponding with the length 250 of the second auxiliary electrode 226b is long.
In certain embodiments, when forming the first electrode 210b of solar battery structure 202a as shown in figs. 5 and 6, the first electrode 210b is more made to comprise several first pilot wire 228a and the second pilot wire 228b.First pilot wire 228a is corresponding with the first auxiliary electrode 226a respectively, and the second pilot wire 228b is corresponding with the second auxiliary electrode 226b respectively.First pilot wire 228a connects the first corresponding auxiliary electrode 226a and the first bus electrode 212, second pilot wire 228b respectively and then connects the second corresponding auxiliary electrode 226b and the first bus electrode 212 respectively.In addition, as shown in Figure 6, the width 252 of the first pilot wire 228a and the width 258 of the second pilot wire 228b are all greater than the width 254 of each first finger electrode 224a and the second finger electrode 224b.
From above-mentioned execution mode, an advantage of the present invention is that a surface of the substrate of solar battery structure is provided with crossing with finger electrode but disjoint with bus electrode several auxiliary electrode, and the electrode section of the bus electrode on another surface of these auxiliary electrodes and substrate is corresponding.When finger electrode breaks and electric current cannot be directly conducted to bus electrode, via the conduction of these auxiliary electrodes, the electric current of finger electrode can be pooled to bus electrode smoothly.Therefore, the loss of fill factor, curve factor can be reduced, and then the energy conversion efficiency of solar cell can be promoted.
From above-mentioned execution mode, another advantage of the present invention is that solar battery structure and solar module comprise the several pilot wires that may correspond to and connect bus electrode and auxiliary electrode, therefore further protection can be provided, with when the electric current that finger electrode transmits cannot be reached bus electrode by auxiliary electrode smoothly, electric current is pooled to bus electrode smoothly.In addition, pilot wire is wide compared with finger electrode, can promote corresponding to the joint steadiness between the finger electrode of electrode section part and bus electrode, and can avoid the bond breakage between finger electrode and bus electrode.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention; any those having an ordinary knowledge in this technical field; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, the scope that therefore protection scope of the present invention ought define depending on appending claims is as the criterion.
Claims (17)
1. a solar battery structure, is characterized in that, comprises:
One substrate, has a relative first surface and a second surface;
One first electrode, be located on this first surface, and comprise at least one first bus electrode, multiple finger electrode and multiple first auxiliary electrode, wherein said finger electrode is crossing with this at least one first bus electrode, described first auxiliary electrode and this at least one first bus electrode non-intersect; And
One second electrode, be located on this second surface, and comprise at least one second bus electrode, this at least one second bus electrode comprises the multiple electrode section corresponding with described first auxiliary electrode, wherein said electrode section is spaced along a bearing of trend of this at least one first bus electrode, electrode section described in each is overlapping at least one first bus electrode of an orthographic projection of this first surface and this, and non-described orthographic projection is on this bearing of trend and forms multiple interval in addition
Wherein, multiple first finger electrode is comprised in described finger electrode, described first finger electrode is crossing with described orthographic projection, and the first auxiliary electrode described in each is positioned at by the side of this orthographic projection of this corresponding electrode section, and described first finger electrode crossing with this corresponding orthographic projection intersects.
2. solar battery structure according to claim 1, it is characterized in that, also comprise multiple second finger electrode in described finger electrode and be arranged in described interval, one end of first auxiliary electrode described in each is stretched in this interval of one end of contiguous this corresponding orthographic projection, and crossing with this second finger electrode being adjacent to this corresponding orthographic projection in this interval of institute's projection.
3. solar battery structure according to claim 2, it is characterized in that, the other end of the first auxiliary electrode described in each is stretched in this interval of the other end of contiguous this corresponding orthographic projection, and crossing with this second finger electrode being adjacent to this corresponding orthographic projection in this interval of institute's projection.
4. solar battery structure according to claim 1, it is characterized in that, this first electrode also comprises multiple first pilot wires corresponding with described first auxiliary electrode, and described in each, the first pilot wire connects this corresponding first auxiliary electrode and this at least one first bus electrode.
5. solar battery structure according to claim 4, is characterized in that, described in each, the width of the first pilot wire is greater than the width of finger electrode described in each.
6. solar battery structure according to claim 1, it is characterized in that, this first electrode also comprises multiple second auxiliary electrode, wherein said second auxiliary electrode and this at least one first bus electrode non-intersect, and corresponding with described first auxiliary electrode, the second auxiliary electrode described in each lays respectively at relative two sides of this orthographic projection of this corresponding electrode section with this corresponding first auxiliary electrode.
7. solar battery structure according to claim 6, it is characterized in that, this first electrode also comprises multiple second pilot wires corresponding with described second auxiliary electrode, and described in each, the second pilot wire connects this corresponding second auxiliary electrode and this at least one first bus electrode.
8. solar battery structure according to claim 6, is characterized in that, the second auxiliary electrode described in each and this corresponding first auxiliary electrode lay respectively at the outside at relative two edges along this bearing of trend of this orthographic projection of this corresponding electrode section.
9. a solar module, is characterized in that, comprises:
One upper plate;
One lower plate;
Multiple solar battery structure as any one in claim 1 ~ 8, is located between this upper plate and this lower plate;
Multiple connecting band, is electrically connected adjacent described solar battery structure; And
At least one encapsulating material layer, between this upper plate and this lower plate, is combined described solar battery structure with this upper plate and this lower plate.
10. a manufacture method for solar battery structure, is characterized in that, comprises:
There is provided a substrate, this substrate has a relative first surface and a second surface;
Form one first electrode on this first surface, wherein this first electrode comprises at least one first bus electrode, multiple finger electrode and multiple first auxiliary electrode, described finger electrode is crossing with this at least one first bus electrode, and described first auxiliary electrode and this at least one first bus electrode non-intersect; And
Form one second electrode on this second surface, wherein this second electrode comprises at least one second bus electrode, it is corresponding with described first auxiliary electrode that this at least one second bus electrode comprises multiple electrode section, described electrode section is spaced along a bearing of trend of this at least one first bus electrode, electrode section described in each is overlapping at least one first bus electrode of an orthographic projection of this first surface and this, in addition non-described orthographic projection is on this bearing of trend and forms multiple interval
Wherein, multiple first finger electrode is comprised in described finger electrode, described first finger electrode is crossing with described orthographic projection, and the first auxiliary electrode described in each is positioned at by the side of this orthographic projection of this corresponding electrode section, and described first finger electrode crossing with this corresponding orthographic projection intersects.
The manufacture method of 11. solar battery structures according to claim 10, it is characterized in that, the step forming this first electrode also comprises makes described finger electrode comprise multiple second finger electrode, described second finger electrode is arranged in described interval, one end of first auxiliary electrode described in each is stretched in this interval of one end of contiguous this corresponding orthographic projection, and crossing with this second finger electrode being adjacent to this corresponding orthographic projection in this interval of institute's projection.
The manufacture method of 12. solar battery structures according to claim 11, it is characterized in that, the other end of the first auxiliary electrode described in each is stretched in this interval of the other end of contiguous this corresponding orthographic projection, and crossing with this second finger electrode being adjacent to this corresponding orthographic projection in this interval of institute's projection.
The manufacture method of 13. solar battery structures according to claim 10, it is characterized in that, the step forming this first electrode also comprises makes this first electrode comprise multiple first pilot wires corresponding with described first auxiliary electrode, and described in each, the first pilot wire connects this corresponding first auxiliary electrode and this at least one first bus electrode.
The manufacture method of 14. solar battery structures according to claim 13, is characterized in that, described in each, the width of the first pilot wire is greater than the width of finger electrode described in each.
The manufacture method of 15. solar battery structures according to claim 10, it is characterized in that, the step forming this first electrode also comprises makes this first electrode comprise multiple second auxiliary electrode, described second auxiliary electrode and this at least one first bus electrode non-intersect, and corresponding with described first auxiliary electrode, the second auxiliary electrode described in each lays respectively at relative two sides of this orthographic projection of this corresponding electrode section with this corresponding first auxiliary electrode.
The manufacture method of 16. solar battery structures according to claim 15, it is characterized in that, the step forming this first electrode also comprises makes this first electrode comprise multiple second pilot wires corresponding with described second auxiliary electrode, and described in each, the second pilot wire connects this corresponding second auxiliary electrode and this at least one first bus electrode.
The manufacture method of 17. solar battery structures according to claim 15, it is characterized in that, the second auxiliary electrode described in each and this corresponding first auxiliary electrode lay respectively at the outside at relative two edges along this bearing of trend of this orthographic projection of this corresponding electrode section.
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| TW103111802 | 2014-03-28 | ||
| TW103111802A TWI528572B (en) | 2014-03-28 | 2014-03-28 | Solar cell structure, method for manufacturing the same and solar cell module |
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| CN104952951B CN104952951B (en) | 2018-10-23 |
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| CN110611007A (en) * | 2019-05-14 | 2019-12-24 | 友达光电股份有限公司 | Solar cell |
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| US20210143290A1 (en) * | 2019-11-13 | 2021-05-13 | Sunpower Corporation | Hybrid dense solar cells and interconnects for solar modules and related methods of manufacture |
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| TW200810137A (en) * | 2006-04-14 | 2008-02-16 | Sharp Kk | Solar cell, solar cell string and solar cell module |
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| CN202948941U (en) * | 2012-11-06 | 2013-05-22 | 茂迪股份有限公司 | solar cell and module thereof |
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- 2014-05-12 CN CN201410196388.7A patent/CN104952951B/en not_active Expired - Fee Related
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| TW200810137A (en) * | 2006-04-14 | 2008-02-16 | Sharp Kk | Solar cell, solar cell string and solar cell module |
| CN201374341Y (en) * | 2009-04-02 | 2009-12-30 | 常州天合光能有限公司 | Solar cell with metalized electrodes |
| CN202487588U (en) * | 2012-02-24 | 2012-10-10 | 上饶光电高科技有限公司 | Crystalline silicon solar battery with improved back structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110611007A (en) * | 2019-05-14 | 2019-12-24 | 友达光电股份有限公司 | Solar cell |
| CN110611007B (en) * | 2019-05-14 | 2021-10-22 | 友达光电股份有限公司 | Solar cell |
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| Publication number | Publication date |
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| TWI528572B (en) | 2016-04-01 |
| CN104952951B (en) | 2018-10-23 |
| TW201537758A (en) | 2015-10-01 |
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