CN109193038B - Baking device for lithium battery - Google Patents
Baking device for lithium battery Download PDFInfo
- Publication number
- CN109193038B CN109193038B CN201811110688.3A CN201811110688A CN109193038B CN 109193038 B CN109193038 B CN 109193038B CN 201811110688 A CN201811110688 A CN 201811110688A CN 109193038 B CN109193038 B CN 109193038B
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- Prior art keywords
- vacuum
- plate
- heating
- baking
- oven
- Prior art date
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 75
- 238000007789 sealing Methods 0.000 claims description 46
- 238000003825 pressing Methods 0.000 claims description 8
- 239000003365 glass fiber Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000002860 competitive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a baking device for a lithium battery, which comprises a vacuum heating oven, a baking module and a reflecting plate, wherein the baking module is arranged in the vacuum heating oven and used for clamping the battery to be baked and heating the battery, and the reflecting plate is arranged on the periphery of the inner wall of the vacuum heating oven and used for reducing heat loss caused by heat radiation.
Description
Technical Field
The invention belongs to the technical field of lithium battery processing equipment, and particularly relates to a baking device for a lithium battery.
Background
The lithium ion battery has the advantages of high energy density, high output voltage, long cycle life, small environmental pollution and the like, is widely used in small digital electronic products, and has wide application prospect in the fields of electric automobiles, aerospace and the like. However, with the rapid development of the lithium ion battery industry, the price, performance and product exchange period of the lithium ion battery are controlled with strong competition, and the battery with low cost and high cost performance becomes a competitive wind vane in the current lithium ion battery industry. In order to make lithium battery products more competitive, lithium battery processing production equipment and processes need to be continuously innovated, so that lithium battery products with high cost performance are produced.
The lithium ion secondary rechargeable battery generally comprises a battery core and a protection circuit board; the rechargeable battery removes the protection circuit board and is just the electric core, and the electric core is the electric storage part in the rechargeable battery, and the quality of electric core has directly decided the quality of rechargeable battery. The battery cells are divided into square battery cells, soft package battery cells (also called as "polymer battery cells", "JR" battery cells) and cylindrical battery cells. The battery of the mobile phone is usually a soft package battery core, the digital products such as Bluetooth and the like mostly adopt soft package battery cores, the power automobile adopts square battery cores, and the battery of the notebook computer adopts serial-parallel combination of cylindrical battery cores.
Prior art (chinese patent, publication No. CN207515370U, patent name is constant temperature lithium battery clamp oven) discloses constant temperature lithium battery clamp oven includes the box, the box includes front end plate, back end plate, left side board, right side board and bottom plate, front end plate, back end plate, left side board and right side board form rectangular frame jointly and are fixed in on the bottom plate, are provided with the heating probe contact point on the bottom plate, have a plurality of hot plate at vertical interval arrangement in the box. In order to ensure that the temperature at two ends of the heating plate is constant in the heating process, the inner surfaces of the left side plate and the right side plate are provided with reflecting plates, the arrangement of the reflecting plates can ensure heat concentration, and heat loss in the heating process is reduced.
In the prior art, the oven of the lithium battery keeps heat in the oven closely against the sealing measure, but the heat is generally dissipated with air, and the heat dissipation in the oven is difficult to avoid due to the heat radiation effect.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a baking device for a lithium battery.
The technical scheme of the invention is realized as follows:
The embodiment of the invention provides a baking device for a lithium battery, which comprises a vacuum heating oven, a baking module and a reflecting plate, wherein the baking module is arranged in the vacuum heating oven and used for clamping the battery to be baked and heating the battery, and the reflecting plate is arranged on the periphery of the inner wall of the vacuum heating oven and used for reducing heat loss caused by heat radiation.
In the scheme, the baking module comprises a heating bottom plate, a first fixing plate, a second fixing plate, a guide rod, a screw rod, a gear box, a pressing plate, a heating plate with a clamping block at the top and an unlocking head; the first fixed plate and the second fixed plate are respectively arranged on two sides of the heating bottom plate, the guide rod penetrates through the heating plates and is arranged between the first fixed plate and the second fixed plate, a gap for placing a battery is arranged between any two adjacent heating plates, the gear box is arranged on the outer side of the first fixed plate or the outer side of the second fixed plate and is connected with the screw rod, the pressing plate is arranged on the screw rod, and the unlocking head is connected with the gear box and is used for controlling the opening and closing of the baking module.
In the scheme, the vacuum heating oven comprises a box body and a sealing door, wherein the sealing door is arranged at the top of the box body and is used for sealing the box body; the reflector plates are arranged on the periphery and the bottom of the inner side of the box body, and each reflector plate is fixed through glass fibers.
In the above scheme, the reflector plate is arranged on the back of the sealing door, and the back of the sealing door is also provided with an O-shaped sealing ring for sealing with the box body.
In the scheme, the edges of two opposite sides of the front surface of the sealing door are provided with the supporting bars, and the end surfaces of the other two sides are provided with the clamping lugs; the edge of the back of the sealing door is provided with a guide sleeve, and the support bar is provided with a locating pin matched with the guide sleeve.
In the scheme, the battery heating device further comprises a vacuum assembly, wherein the vacuum assembly is arranged on the outer side of the vacuum heating oven and used for heating the battery in a vacuum environment by vacuumizing the interior of the vacuum heating oven.
In the scheme, the vacuum assembly comprises a vacuum gauge and a vacuum baffle valve, and the vacuum gauge is connected with the vacuum baffle valve.
In the above-mentioned scheme, its characterized in that, it still includes aviation plug, aviation plug sets up the outside that is used for connecting the power in vacuum heating oven.
Compared with the prior art, the embodiment of the invention provides a baking device for a lithium battery, which comprises a vacuum heating oven, a baking module and a reflecting plate, wherein the baking module is arranged in the vacuum heating oven and used for clamping the battery to be baked and heating the battery, and the reflecting plate is arranged on the periphery of the inner wall of the vacuum heating oven and used for reducing heat loss caused by heat radiation.
Drawings
Fig. 1 is a schematic structural view of a baking apparatus for lithium batteries according to an embodiment of the present invention;
fig. 2 is a front perspective view of a baking apparatus for lithium batteries according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a schematic structural diagram of a vacuum heating oven in a baking device for lithium batteries according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a sealing door in a baking apparatus for lithium batteries according to an embodiment of the present invention;
fig. 6 is a schematic view showing the structure of the back surface of a sealing door in a baking apparatus for lithium batteries according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a baking module in a baking apparatus for lithium batteries according to an embodiment of the present invention.
The reference numerals are as follows:
1-vacuum heating oven, 11-box body, 111-reinforcing rib, 12-sealing door, 121-supporting bar, 122-clamping lug, 123-guiding sleeve, 124-O-shaped sealing ring, 125-positioning pin, 2-baking module, 21-heating bottom plate, 22-first fixing plate, 23-second fixing plate, 24-guide rod, 25-screw rod, 26-gear box, 27-baffle, 28-heating plate, 29-unlocking head, 3-reflecting plate, 4-wave fiber, 5-vacuum component, 51-vacuum gauge, 52-vacuum baffle valve and 6-aviation plug.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides a baking device for a lithium battery, which comprises a vacuum heating oven 1, a baking module 2 and a reflecting plate 3, wherein the baking module 2 is arranged in the vacuum heating oven 1 and used for clamping the battery to be baked and heating the battery, and the reflecting plate 3 is arranged on the periphery of the inner wall of the vacuum heating oven 1 and used for reducing heat loss caused by heat radiation.
Constant temperature lithium cell anchor clamps oven among the prior art, the power distribution box comprises a box body, the box includes front end plate, back end plate, left side board, right side board and bottom plate, front end plate, back end plate, left side board and right side board form rectangular frame jointly and are fixed in on the bottom plate, are provided with the heating probe contact point on the bottom plate, have a plurality of hot plate at vertical interval arrangement in the box. In order to ensure that the temperature at two ends of the heating plate is constant in the heating process, the inner surfaces of the left side plate and the right side plate are provided with reflecting plates, the arrangement of the reflecting plates can ensure heat concentration, and heat loss in the heating process is reduced.
It does not disclose a sealing door 12 in the present embodiment, and referring to fig. 2 and 3, the vacuum heating oven 1 includes a cabinet 11 and a sealing door 12, the sealing door 12 being disposed at the top of the cabinet 11 for sealing the cabinet 11; the reflecting plates 3 are arranged on the periphery and the bottom of the inner side of the box 11, and each reflecting plate 3 is fixed through glass fibers 4.
Among them, the glass fiber 15 is usually a green wave fiber.
Referring to fig. 4, it further includes a vacuum assembly 5, and the vacuum assembly 5 is disposed at the outer side of the vacuum heating oven 1 for heating the battery under a vacuum environment by evacuating the inside of the vacuum heating oven 1.
The vacuum assembly 5 comprises a vacuum gauge 51 and a vacuum baffle valve 52, and the vacuum gauge 51 is connected with the vacuum baffle valve 52.
Wherein, a plurality of reinforcing ribs 111 are uniformly arranged on the outer side of the box body 11.
It also comprises an aviation plug 6, wherein the aviation plug 6 is arranged on the outer side of the vacuum heating oven 1 and is used for connecting a power supply.
Referring to fig. 5 and 6, the reflecting plate 3 is disposed at the back of the sealing door 12, and the back of the sealing door 12 is further provided with an O-ring 124 for sealing with the case 11.
The edges of the two opposite sides of the front surface of the sealing door 12 are provided with supporting bars 121, and the end surfaces of the other two sides are provided with clamping lugs 122.
The arrangement of the reflecting plate 3 on the back of the sealing door 12 also plays a role in reflection, so that heat dissipation is reduced; in addition, since the sealing door 12 is made of aluminum plate, the back surface of the sealing door 12 can also be polished directly to form the reflecting plate 3.
The edge of the back of the sealing door 12 is provided with a guide sleeve 123, and the support bar 121 is provided with a positioning pin 125 matched with the guide sleeve 123.
The clamping lugs 122 arranged on the end surfaces of the two sides of the sealing door 12 are used for being matched with the sealing door module of the switch to open and cover the sealing door 12, the sealing door module of the switch takes the sealing door 12 of the vacuum heating oven 1 and places the sealing door 12 on the adjacent vacuum heating oven 1, the supporting strips 121 arranged on the edges of the two opposite sides of the front surface of the sealing door 12 are used for enabling gaps to exist between the stacked sealing doors 12, the operation of the sealing door module of the switch is facilitated, and the guide sleeve 123 on the back surface of the sealing door 12 and the positioning pin 125 on the front surface are matched and arranged, so that the stacking of a plurality of sealing doors 12 is facilitated.
Referring to fig. 7, there is no disclosure of the baking module 2 in the present embodiment, the baking module 2 includes a heating base 21, a first fixing plate 22, a second fixing plate 23, a guide bar 24, a screw 25, a gear box 26, a pressing plate 27, a heating plate 28 with a clamping block on top, and an unlocking head 29; the first fixing plate 22 and the second fixing plate 23 are respectively arranged on two sides of the heating bottom plate 21, the guide rods 24 penetrate through a plurality of heating plates 28 and are arranged between the first fixing plate 22 and the second fixing plate 23, a gap for placing a battery is arranged between any two adjacent heating plates 28, the gear box 26 is arranged on the outer side of the first fixing plate 22 or the outer side of the second fixing plate 23 and is connected with the screw rod 25, the pressing plate 27 is arranged on the screw rod 25, and the unlocking head 29 is connected with the gear box 26 and used for controlling the opening and closing of the baking module.
The screw 25 preferably adopts a double screw structure (but not limited to a double screw); the transmission part can also adopt synchronous belt transmission to replace the gear box 26 to control the opening and closing of the baking module 2.
Therefore, independent power is adopted in the unlocking and locking processes of the baking module 2, and double screw rods and nonmetallic gears are used for transmission, so that the transmission stability is ensured, and the wrinkling of the surface of the battery is prevented.
The four guide rods 24 are respectively connected with the four top angles of the first fixing plate 22 and the second fixing plate 23, the pair of screw rods 25 are respectively arranged on two sides of the heating plate 28.
Because the soft package battery only needs to bake the part where the electrolyte at the lower part is located, but the prior art is to heat the whole battery, in the embodiment, the adjacent heating plate 28 clamps the body of the battery to realize touch type heating, and the adjacent clamping blocks limit the bag body of the battery to prevent the bag body from falling into the gap of the heating plate 28 to heat, so that the soft package battery only has the clamping function.
The gear box 26 comprises a gear transmission mechanism and a gear box body, and a large amount of heat can be generated in the vacuum heating oven 1, so that the gear box body covers the outside of the gear transmission mechanism, the heat can be blocked, and the gear transmission mechanism is prevented from being damaged due to long-term heating.
The working process of the baking module 2 comprises the following steps: the unlocking head 29 is started, the gear transmission mechanism in the gear box 26 works to drive the screw rod 25 to rotate, and the pressing plate 27 is connected with the screw rod 25 in a matched mode, the screw rod 25 drives the pressing plate 27 to move towards the other end of the baking module 2, so that the heating plates 28 are pushed to move, gaps between the heating plates 28 are reduced, and therefore the battery is clamped.
In the baking process, the reflectors 3 around and at the bottom of the inner wall of the box 11 and the reflectors 3 at the back of the sealing door 12 can play a role in reflection, so that heat dissipation is reduced.
According to the invention, the vacuum heating oven is adopted, and the reflecting plates are arranged on the periphery of the inner wall of the vacuum heating oven, so that the heat dissipated outwards can be reflected to the battery, the dissipation of the heat in the oven can be reduced, the baking efficiency of the battery is improved, and the baking uniformity of the oven is improved.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (6)
1. The baking device for the lithium battery is characterized by comprising a vacuum heating oven, a baking module and a reflecting plate, wherein the baking module is arranged in the vacuum heating oven and used for clamping the battery to be baked and heating the battery, and the reflecting plate is arranged on the periphery of the inner wall of the vacuum heating oven;
The baking module comprises a heating bottom plate, a first fixing plate, a second fixing plate, a guide rod, a screw rod, a gear box, a pressing plate, a heating plate with a clamping block at the top and an unlocking head; the first fixing plate and the second fixing plate are respectively arranged at two sides of the heating bottom plate, the guide rod penetrates through the heating plates and is arranged between the first fixing plate and the second fixing plate, a gap for placing a battery is arranged between any two adjacent heating plates, the gear box is arranged at the outer side of the first fixing plate or the outer side of the second fixing plate and is connected with the screw rod, the pressing plate is arranged on the screw rod, and the unlocking head is connected with the gear box and is used for controlling the opening and closing of the baking module;
The vacuum heating oven comprises an oven body and a sealing door, wherein the sealing door is arranged at the top of the oven body and is used for sealing the oven body; the reflector plates are arranged on the periphery and the bottom of the inner side of the box body, and each reflector plate is fixed through glass fibers.
2. The baking device for the lithium battery according to claim 1, wherein the reflecting plate is arranged on the back surface of the sealing door, and the back surface of the sealing door is further provided with an O-ring for sealing with the case.
3. The baking device for the lithium battery according to claim 2, wherein the edges of the two opposite sides of the front surface of the sealing door are provided with supporting bars, and the end surfaces of the other two sides are provided with clamping lugs; the edge of the back of the sealing door is provided with a guide sleeve, and the support bar is provided with a locating pin matched with the guide sleeve.
4. The baking device for the lithium battery according to claim 1, further comprising a vacuum assembly provided at an outer side of the vacuum heating oven for heating the battery in a vacuum environment by evacuating an inside of the vacuum heating oven.
5. The baking apparatus for a lithium battery of claim 4, wherein the vacuum assembly comprises a vacuum gauge and a vacuum flapper valve, the vacuum gauge and the vacuum flapper valve being connected.
6. The baking apparatus for a lithium battery according to any of claims 1 to 5, further comprising an aviation plug provided outside the vacuum heating oven for connection to a power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811110688.3A CN109193038B (en) | 2018-09-21 | 2018-09-21 | Baking device for lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811110688.3A CN109193038B (en) | 2018-09-21 | 2018-09-21 | Baking device for lithium battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109193038A CN109193038A (en) | 2019-01-11 |
| CN109193038B true CN109193038B (en) | 2024-06-11 |
Family
ID=64909318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811110688.3A Active CN109193038B (en) | 2018-09-21 | 2018-09-21 | Baking device for lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109193038B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4757184A (en) * | 1986-12-24 | 1988-07-12 | Swanson David L | Rack loaded, radiant heated, cantilevered deck oven and method |
| KR100828425B1 (en) * | 2007-04-03 | 2008-05-08 | 주식회사 파리크라상 | Heating apparatus for a oven |
| CN203216244U (en) * | 2013-03-20 | 2013-09-25 | 东莞市力嘉电池有限公司 | Lithium-ion battery vacuum baking device |
| CN205004399U (en) * | 2015-07-27 | 2016-01-27 | 珠海光宇电池有限公司 | Lithium cell electricity core vacuum baking equipment |
| WO2016045289A1 (en) * | 2014-09-25 | 2016-03-31 | 深圳市时代高科技设备有限公司 | Full-automatic vacuum drying furnace |
| CN207515370U (en) * | 2017-08-08 | 2018-06-19 | 河南鼎能电子科技有限公司 | Constant temperature lithium battery fixture oven |
| CN208908241U (en) * | 2018-09-21 | 2019-05-28 | 深圳市鹰慧科技有限公司 | A kind of apparatus for baking for lithium battery |
-
2018
- 2018-09-21 CN CN201811110688.3A patent/CN109193038B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4757184A (en) * | 1986-12-24 | 1988-07-12 | Swanson David L | Rack loaded, radiant heated, cantilevered deck oven and method |
| KR100828425B1 (en) * | 2007-04-03 | 2008-05-08 | 주식회사 파리크라상 | Heating apparatus for a oven |
| CN203216244U (en) * | 2013-03-20 | 2013-09-25 | 东莞市力嘉电池有限公司 | Lithium-ion battery vacuum baking device |
| WO2016045289A1 (en) * | 2014-09-25 | 2016-03-31 | 深圳市时代高科技设备有限公司 | Full-automatic vacuum drying furnace |
| CN205004399U (en) * | 2015-07-27 | 2016-01-27 | 珠海光宇电池有限公司 | Lithium cell electricity core vacuum baking equipment |
| CN207515370U (en) * | 2017-08-08 | 2018-06-19 | 河南鼎能电子科技有限公司 | Constant temperature lithium battery fixture oven |
| CN208908241U (en) * | 2018-09-21 | 2019-05-28 | 深圳市鹰慧科技有限公司 | A kind of apparatus for baking for lithium battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109193038A (en) | 2019-01-11 |
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Effective date of registration: 20190904 Address after: 518052 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A Applicant after: Guangdong Kunchuan Industrial Co.,Ltd. Address before: 518100 Huafeng Yuan Business Building, 45 Xin'an Street, Baoan District, Shenzhen City, Guangdong Province 728-02 Applicant before: SHENZHEN YINGHUI TECHNOLOGY CO.,LTD. |
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