CN107947737B - A kind of test device for more main grid solar batteries - Google Patents
A kind of test device for more main grid solar batteries Download PDFInfo
- Publication number
- CN107947737B CN107947737B CN201711161243.3A CN201711161243A CN107947737B CN 107947737 B CN107947737 B CN 107947737B CN 201711161243 A CN201711161243 A CN 201711161243A CN 107947737 B CN107947737 B CN 107947737B
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- laying
- probe plate
- main grid
- probe
- expandable strip
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- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 239000000523 sample Substances 0.000 claims abstract description 77
- 229910000679 solder Inorganic materials 0.000 claims abstract description 4
- 230000033228 biological regulation Effects 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000013083 solar photovoltaic technology Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/06711—Probe needles; Cantilever beams; "Bump" contacts; Replaceable probe pins
- G01R1/06716—Elastic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/06—Measuring leads; Measuring probes
- G01R1/067—Measuring probes
- G01R1/073—Multiple probes
- G01R1/07307—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card
- G01R1/07357—Multiple probes with individual probe elements, e.g. needles, cantilever beams or bump contacts, fixed in relation to each other, e.g. bed of nails fixture or probe card with flexible bodies, e.g. buckling beams
-
- 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
Abstract
The present invention discloses a kind of test device for more main grid solar batteries, it include: multiple probe plate-layings, it is connect by p-wire with test machine, one or more probe being arranged along its length is equipped in every row's probe plate-laying, probe with the solder joint on solar battery main grid for contacting；Further include: spacing adjusts component, is used to adjust the spacing between adjacent probe plate-laying.A kind of test device structure for more main grid solar batteries of the invention is simple, adjusts component by spacing to adjust the spacing between adjacent probe plate-laying, suitable for the solar battery of different designs, the scope of application is wider.
Description
Technical field
The invention belongs to solar-photovoltaic technology fields, and in particular to a kind of test dress for more main grid solar batteries
It sets.
Background technique
It is shown according to the international photovoltaic route map publication data of ITRPV (2016): by 2015, the accumulative crystal silicon photovoltaic group in the whole world
Part shipment amount reaches 234GW, installs total amount 227GW.Wherein 2014, component shipment amount in 2015 be respectively 39.3GW and
50GW, component price have dropped nearly 20% in this 2 years.And requirement of the market to product also will be higher and higher, more and more
Client is to the efficiency of component and quality settings threshold.
More main grid technologies be it is a kind of path is collected by reduction electric current, to reduce the technology of resistance loss, pass through optimization
Electrode pattern design and welding collocation, can be further reduced shading, reduce silver paste consumption, the technical principle is simple, and scheme is easy
Implement, can quickly and effectively promote the power and quality level of existing product, photovoltaic power generation degree electricity cost is reduced, to seize height
(PCC) power market.More main grid cell pieces are needed to be adjusted existing test machine and are just able to satisfy test due to its technical characterstic
Demand is generally carried out by the way of frock clamp at present.
Existing frock clamp is all made of customization manufacture, a kind of mating a kind of tooling of electrode design, when electrode design occurs
After variation, needs to redesign a set of matched tooling, increase cost.
Summary of the invention
In order to solve the above-mentioned technical problem, the invention proposes a kind of test devices for more main grid solar batteries.
In order to achieve the above object, technical scheme is as follows:
A kind of test device for more main grid solar batteries, comprising: multiple probe plate-layings by p-wire and are surveyed
Test-run a machine connection is equipped with one or more probe being arranged along its length in every row's probe plate-laying, and probe is used for and the sun
Solder joint contact on energy battery main grid；Further include: spacing adjusts component, is used to adjust the spacing between adjacent probe plate-laying.
A kind of test device structure for more main grid solar batteries of the invention is simple, adjusts component by spacing to adjust
The spacing between adjacent probe plate-laying is saved, suitable for the solar battery of different designs, the scope of application is wider.
Based on the above technical solution, following improvement can also be done:
As a preferred option, further includes: two connecting plates, it is detachable with the opposite end of multiple probe plate-layings respectively
Connection, is equipped with sliding slot on connecting plate, and the sliding part in probe plate-laying protrudes into the sliding slot.
Using the above preferred scheme, each probe plate-laying uses relatively independent detachable setting, can be according to tool
The solar battery of body designs to increase and decrease the quantity of probe plate-laying, and it is more convenient to operate, and the scope of application is wider.
As a preferred option, it is to be set to each probe plate-laying both ends for fixing probe row that spacing, which adjusts component,
The fastening bolt of plate.
Using the above preferred scheme, position of the probe plate-laying in sliding slot is adjusted by adjusting fastening bolt, operated
It is convenient.
As a preferred option, it includes: multiple Expandable strips that spacing, which adjusts component, and each Expandable strip is set to adjacent probe row
In sliding slot between plate sliding part；Air pressure controlling device is connect with Expandable strip by tracheae, for adjusting the flexible length of Expandable strip
Degree.
Using the above preferred scheme, adjacent probe plate-laying is separated by Expandable strip, is adjusted by air pressure controlling device swollen
Air pressure in swollen item so as to adjust Expandable strip collapsing length so that the spacing of adjacent probe plate-laying meets test request.
As a preferred option, the both ends of Expandable strip be equipped with connection bump and/or connecting groove, on sliding part be equipped with
The groove and/or protrusion that connection bump and/or connecting groove match.
Using the above preferred scheme, the bonding strength between Expandable strip and probe plate-laying is improved, is guaranteed in adjustment probe
When plate-laying position, the stability under loading of probe plate-laying.
As a preferred option, it is equipped with positioning protrusion or positioning groove on the surface of Expandable strip, is set in the inner surface of sliding slot
There are the multiple grooves to match with positioning protrusion or positioning groove or protrusion.
Using the above preferred scheme, it is equipped with multiple grooves or protrusion in the inner surface of sliding slot, when air pressure controlling device tune
When the length of whole Expandable strip makes it be stretched to certain value, the positioning protrusion or positioning groove on Expandable strip surface are displaced outwardly, positioning
Protrusion or positioning groove protrude into groove or the protrusion of the inner surface of sliding slot, and positioning is completed.Or when the adjustment of air pressure controlling device is swollen
When the length of swollen item makes it retract to certain value, the positioning protrusion or positioning groove on Expandable strip surface are moved inward, positioning protrusion
Or positioning groove protrudes into groove or the protrusion of the inner surface of sliding slot, positioning is completed.
As a preferred option, direction of the diameter dimension of the expansion air flue of Expandable strip from air inlet end to sliding part gradually increases
Greatly.
Using the above preferred scheme, what air-flow can be stable flows to the position in Expandable strip close to sliding part, guarantees to slide
The stability of dynamic portion's stress.
As a preferred option, it includes: electromagnet that spacing, which adjusts component, is set to the opposite sides of each probe plate-laying；
Magnetic regulation device, is electrically connected with electromagnet, for adjusting the polarity and magnetic intensity of electromagnet.
Using the above preferred scheme, the polarity and magnetic intensity of electromagnet are adjusted by magnetic regulation device, are utilized " same
Property is repelled each other, and there is a natural attraction between the sexes " magnetic signature adjust the position of probe plate-laying so that the spacing of adjacent probe plate-laying meets test
It is required that.
As a preferred option, multiple elastic components are equipped in sliding slot, elastic component is set to the sliding of adjacent probe plate-laying
Between portion, and it is connect with probe plate-laying.
Using the above preferred scheme, adjacent probe plate-laying is separated using elastic component, so that magnetic regulation device
Regulation it is more accurate.
As a preferred option, it is equipped with positioning protrusion or positioning groove on the surface of elastic component, is set in the inner surface of sliding slot
There are the multiple grooves to match with positioning protrusion or positioning groove or protrusion.
Using the above preferred scheme, so that the regulation of magnetic regulation device is more accurate.It is equipped in the inner surface of sliding slot more
A groove or protrusion, when magnetic regulation device adjust adjacent probe plate-laying electromagnet there is a natural attraction between the sexes, be set to two probes
Elastic component between plate-laying is squeezed, and the positioning protrusion or positioning groove on elastic component surface inwardly bounce back, positioning protrusion or fixed
Position groove protrudes into groove or the protrusion of the inner surface of sliding slot, and positioning is completed.When magnetic regulation device adjusts adjacent probe plate-laying
Electromagnet identical charges repel each other, the elastic component being set between two probe plate-layings is stretched, the convex on elastic component surface
It rises or positioning groove stretches out, positioning protrusion or positioning groove protrude into groove or the protrusion of the inner surface of sliding slot, have positioned
At.
Detailed description of the invention
Fig. 1 is a kind of structural representation of the test device for more main grid solar batteries provided in an embodiment of the present invention
Figure.
Fig. 2 is the partial structural diagram of probe plate-laying and connecting plate provided in an embodiment of the present invention.
Fig. 3 is the cross-sectional view of probe plate-laying and Expandable strip provided in an embodiment of the present invention.
Fig. 4 is the cross-sectional view of Expandable strip provided in an embodiment of the present invention.
Fig. 5 is the cross-sectional view of probe plate-laying provided in an embodiment of the present invention, electromagnet and elastic component.
Wherein: probe plate-laying 1, sliding part 11, p-wire 2, probe 3, connecting plate 4, sliding slot 41, fastening bolt 5, Expandable strip
6, positioning protrusion 61, expansion air flue 62, air inlet end 63, electromagnet 7, elastic component 8, positioning protrusion 81.
Specific embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
In order to reach the purpose of the present invention, a kind of some of implementations of the test device for more main grid solar batteries
In example,
As shown in Figs. 1-2, a kind of test device for more main grid solar batteries includes: multiple probe plate-layings 1, spacing
Adjust component and two connecting plates 4.
Multiple probe plate-layings 1 are connect by p-wire 2 with test machine (not shown), are set in every row's probe plate-laying 1
There are the more probes being arranged along its length 3, probe 3 with the solder joint on solar battery main grid for contacting.Spacing is adjusted
Component is used to adjust the spacing between adjacent probe plate-laying 1.Opposite end of two connecting plates 4 respectively with multiple probe plate-layings 1 can
It is detachably connected with, sliding slot 41 is equipped on connecting plate 4, the sliding part 11 in probe plate-laying 1 protrudes into the sliding slot 41.
It is to be set to each 1 both ends of probe plate-laying for fixing the fastening bolt of the probe plate-laying 1 that spacing, which adjusts component,
5。
A kind of test device for more main grid solar batteries of the invention has the beneficial effect that:
1) structure is simple, adjusts component by spacing to adjust the spacing between adjacent probe plate-laying 1, sets suitable for difference
The solar battery of meter, the scope of application is wider, saves cost.
2) each probe plate-laying 1 uses relatively independent detachable setting, can be according to specific solar battery
It designs to increase and decrease the quantity of probe plate-laying 1, it is more convenient to operate, and the scope of application is wider.
3) position of the probe plate-laying 1 in sliding slot 41 is adjusted by adjusting fastening bolt, it is convenient to operate.
4) present invention can be mounted directly on a testing machine, connects p-wire 2, realize test function.
As shown in figure 3, in order to further optimize implementation result of the invention, in other embodiment, remaining
Feature technology is identical, the difference is that, it includes: multiple Expandable strips 6 that spacing, which adjusts component, and each Expandable strip 6 is set to adjacent
In sliding slot 41 between 1 sliding part 11 of probe plate-laying；Air pressure controlling device (not shown) is connected with Expandable strip 6 by tracheae
It connects, for adjusting the collapsing length of Expandable strip 6.
Using the above preferred scheme, adjacent probe plate-laying 1 is separated by Expandable strip 6, is adjusted by air pressure controlling device
Air pressure in Expandable strip 6 so as to adjust Expandable strip 6 collapsing length so that the spacing of adjacent probe plate-laying 1 meets test request.
Further, the both ends of Expandable strip 6 are equipped with connection bump and/or connecting groove, are equipped with and connection on sliding part 11
The groove and/or protrusion that protrusion and/or connecting groove match.
Using the above preferred scheme, the bonding strength between Expandable strip 6 and probe plate-laying 1 is improved, guarantees to visit in adjustment
When needle 1 position of plate-laying, the stability under loading of probe plate-laying 1.
Further, it is equipped with positioning protrusion 61 on the surface of Expandable strip 6, is equipped with and positioning protrusion 61 in the inner surface of sliding slot 41
The multiple grooves to match.
Using the above preferred scheme, multiple grooves can be equipped in the inner surface of sliding slot 41, when air pressure controlling device adjusts
When the length of Expandable strip 6 makes it be stretched to certain value, the positioning protrusion 61 on 6 surface of Expandable strip is displaced outwardly, and positioning protrusion 61 is stretched
In the groove for entering the inner surface of sliding slot 41, positioning is completed.Or when the length of air pressure controlling device adjustment Expandable strip 6 retracts to it
When certain value, the positioning protrusion 61 on 6 surface of Expandable strip is moved inward, and positioning protrusion 61 protrudes into the groove of the inner surface of sliding slot 41
Interior, positioning is completed.
In other embodiments, it can also be equipped with positioning groove on the surface of Expandable strip 6, be equipped in the inner surface of sliding slot 41
The multiple protrusions to match with positioning groove.
As shown in figure 4, further, the diameter dimension of the expansion air flue 62 of Expandable strip 6 is from air inlet end 63 to sliding part 11
Direction be gradually increased.
Using the above preferred scheme, what air-flow can be stable flows to the position in Expandable strip 6 close to sliding part 11, guarantees
The stability of 11 stress of sliding part.
As shown in figure 5, in order to further optimize implementation result of the invention, in other embodiment, remaining
Feature technology is identical, the difference is that, it includes: electromagnet 7 that spacing, which adjusts component, is set to the opposite of each probe plate-laying 1
Two sides；Magnetic regulation device (not shown), is electrically connected with electromagnet 7, and the polarity and magnetism for adjusting electromagnet 7 are strong
Degree.
Using the above preferred scheme, the polarity and magnetic intensity of electromagnet 7 are adjusted by magnetic regulation device, are utilized
The magnetic signature of " identical charges repel each other, and there is a natural attraction between the sexes " adjusts the position of probe plate-laying 1, so that the spacing of adjacent probe plate-laying 1 accords with
Close test request.
Further, multiple elastic components 8 are equipped in sliding slot 41, elastic component 8 is set to the sliding part 11 of adjacent probe plate-laying 1
Between, and connect with probe plate-laying 1.
Using the above preferred scheme, adjacent probe plate-laying 1 is separated using elastic component, so that magnetic regulation device
Regulation it is more accurate.
Further, it is equipped with positioning protrusion 81 on the surface of elastic component 8, is equipped with and positioning protrusion 81 in the inner surface of sliding slot 41
The multiple grooves to match.
Using the above preferred scheme, so that the regulation of magnetic regulation device is more accurate.It is equipped in the inner surface of sliding slot 41
Multiple grooves, when magnetic regulation device adjust adjacent probe plate-laying 1 electromagnet there is a natural attraction between the sexes, be set to two probe plate-layings
Elastic component 8 between 1 is squeezed, and the positioning protrusion 81 on 8 surface of elastic component moves inward, and positioning protrusion 81 protrudes into sliding slot 41
In the groove of inner surface, positioning is completed.Or identical charges repel each other when magnetic regulation device adjusts the electromagnet of adjacent probe plate-laying 1, if
The elastic component 8 being placed between two probe plate-layings 1 is stretched, and the positioning protrusion 81 on 8 surface of elastic component is displaced outwardly, positioning
In the groove for the inner surface that protrusion 81 protrudes into sliding slot 41, positioning is completed.
In other embodiments, it can also be equipped with positioning groove on the surface of elastic component 8, be equipped in the inner surface of sliding slot 41
The multiple protrusions to match with positioning groove.
The above are merely the preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art,
Without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Claims (4)
1. a kind of test device for more main grid solar batteries, comprising:
Multiple probe plate-layings are connect by p-wire with test machine, are equipped with one or more in the probe plate-laying described in every row
The probe being arranged along its length, the probe with the solder joint on solar battery main grid for contacting；
It is characterized by further comprising:
Spacing adjusts component, is used to adjust the spacing between the adjacent probe plate-laying；
The spacing adjusts component
Multiple Expandable strips, each Expandable strip are set in the sliding slot between adjacent probe plate-laying sliding part；
Air pressure controlling device is connect, for adjusting the collapsing length of the Expandable strip by tracheae with the Expandable strip；
It is equipped with positioning protrusion or positioning groove on the surface of the Expandable strip, is equipped with and the positioning in the inner surface of the sliding slot
The multiple grooves or protrusion that protrusion or positioning groove match.
2. the test device according to claim 1 for more main grid solar batteries, which is characterized in that further include:
Two connecting plates are set on the connecting plate respectively with the opposite end detachable connection of multiple probe plate-layings
There is sliding slot, the sliding part in the probe plate-laying protrudes into the sliding slot.
3. the test device according to claim 2 for more main grid solar batteries, which is characterized in that the Expandable strip
Both ends be equipped with connection bump and/or connecting groove, on the sliding part be equipped with and the connection bump and/or connecting groove
The groove and/or protrusion to match.
4. the test device according to claim 1-3 for more main grid solar batteries, which is characterized in that institute
The diameter dimension for stating the expansion air flue of Expandable strip is gradually increased from air inlet end to the direction of the sliding part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711161243.3A CN107947737B (en) | 2017-11-20 | 2017-11-20 | A kind of test device for more main grid solar batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711161243.3A CN107947737B (en) | 2017-11-20 | 2017-11-20 | A kind of test device for more main grid solar batteries |
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| Publication Number | Publication Date |
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| CN107947737A CN107947737A (en) | 2018-04-20 |
| CN107947737B true CN107947737B (en) | 2019-04-16 |
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| CN201711161243.3A Active CN107947737B (en) | 2017-11-20 | 2017-11-20 | A kind of test device for more main grid solar batteries |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108469439A (en) * | 2018-06-13 | 2018-08-31 | 华南理工大学 | Based on electroluminescent solar battery sheet defect detecting device and method |
| CN111786633A (en) * | 2020-06-30 | 2020-10-16 | 无锡日托光伏科技有限公司 | EL testing device for MWT battery |
| CN113049859A (en) * | 2021-03-04 | 2021-06-29 | 上饶捷泰新能源科技有限公司 | Modularized solar cell test probe row |
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| JP2014238332A (en) * | 2013-06-07 | 2014-12-18 | 三菱電機株式会社 | Inspection method for semiconductor device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10197599B2 (en) * | 2015-12-16 | 2019-02-05 | Infineon Technologies Ag | Test pin configuration for test device for testing devices under test |
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- 2017-11-20 CN CN201711161243.3A patent/CN107947737B/en active Active
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|---|---|---|---|---|
| DE10108743B4 (en) * | 2001-02-23 | 2004-09-09 | Infineon Technologies Ag | Pin card for testing an integrated circuit and using the pin card |
| JP2014238332A (en) * | 2013-06-07 | 2014-12-18 | 三菱電機株式会社 | Inspection method for semiconductor device |
| CN204088271U (en) * | 2014-07-08 | 2015-01-07 | 浙江格普新能源科技有限公司 | A kind of photovoltaic one-sheet test device |
| CN204206106U (en) * | 2014-09-18 | 2015-03-11 | 衡水英利新能源有限公司 | A kind of solar battery sheet electroluminescence defect detector slide holder |
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| CN107947737A (en) | 2018-04-20 |
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Effective date of registration: 20191031 Address after: 215000 No. 1 Tenghui Road, Changkun Industrial Park, Shajiabang Town, Changshu City, Jiangsu Province Co-patentee after: Tenghui Photovoltaic (Ningxia) Co., Ltd. Patentee after: Suzhou Tenghui Photovoltaic Technology Co., Ltd. Address before: 215542, Teng Hui Road 1, Sha Chang town, Suzhou, Jiangsu, Changshou City Patentee before: Suzhou Tenghui Photovoltaic Technology Co., Ltd. |
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Effective date of registration: 20211028 Address after: 223800 No. 211, Zhongxing East Road, economic development zone, Siyang County, Suqian City, Jiangsu Province Patentee after: Siyang Tenghui New Energy Technology Co.,Ltd. Patentee after: SUZHOU TALESUN SOLAR TECHNOLOGIES Co.,Ltd. Address before: 215000 No.1 Tenghui Road, Changkun Industrial Park, Shajiabang Town, Changshu City, Suzhou City, Jiangsu Province Patentee before: SUZHOU TALESUN SOLAR TECHNOLOGIES Co.,Ltd. Patentee before: TENGHUI PHOTOVOLTAIC (NINGXIA) Co.,Ltd. |