CN114759166B - Double-sided powder spraying and lithium supplementing process - Google Patents
Double-sided powder spraying and lithium supplementing process Download PDFInfo
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- CN114759166B CN114759166B CN202210362518.4A CN202210362518A CN114759166B CN 114759166 B CN114759166 B CN 114759166B CN 202210362518 A CN202210362518 A CN 202210362518A CN 114759166 B CN114759166 B CN 114759166B
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- pole piece
- powder spraying
- piece belt
- powder
- rolling
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- 239000000843 powder Substances 0.000 title claims abstract description 89
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 51
- 238000005507 spraying Methods 0.000 title claims abstract description 50
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title claims abstract description 22
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 20
- 230000003068 static effect Effects 0.000 claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- 238000002372 labelling Methods 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 11
- 229920002799 BoPET Polymers 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 229920002545 silicone oil Polymers 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 5
- 230000009469 supplementation Effects 0.000 description 5
- 238000012937 correction Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 229910000733 Li alloy Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a double-sided powder spraying and lithium supplementing process, which comprises the following steps of: step one: the winding roller at the inlet end of the A-side powder spraying machine unwinds the polar plate strip; step two: feeding the unreeled pole piece belt into an A-side powder sprayer for powder spraying; step three: the pole piece belt after powder spraying sequentially passes through an electrostatic generator and an electrostatic removing device; step four: the pole piece belt after the powder spraying on the surface A is rolled by a first group of rollers; step five: correcting the deviation by a deviation correcting machine; step six: the pole piece belt enters a B-side powder sprayer for powder spraying; step seven: the pole piece belt after powder spraying passes through the static generator and the static eliminating device again in sequence; step eight: rolling the pole piece belt subjected to the powder spraying on the surface B through a second group of rolling rollers, and rolling the pole piece belt through a rolling roller at the outlet end of the labeling machine; according to the invention, through the two groups of powder sprayers and the matched auxiliary structure, the double-sided lithium supplementing operation can be completed only by single processing, the lithium supplementing effect is better, and the efficiency is higher.
Description
Technical Field
The invention relates to the field of lithium battery lithium supplementing processes, in particular to a double-sided powder spraying lithium supplementing process.
Background
A lithium battery is a battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a negative electrode material, and therefore, such a battery is also called a lithium metal battery.
Because the electrode of the lithium battery adopts the pole piece material of lithium metal or lithium alloy, therefore when processing, the operation of lithium supplementation is usually needed, the existing lithium supplementation mode is generally assisted by a transfer film, and lithium supplementation is carried out on two sides of the pole piece in a pressing mode, so that the mode cannot supplement lithium for the pole piece with wide width, and the lithium supplementation thickness is higher, so that the ultrathin lithium supplementation effect cannot be realized.
Disclosure of Invention
The invention aims to provide a double-sided powder spraying lithium supplementing process, which aims to solve the problems that the existing lithium supplementing mode cannot supplement lithium to a wide and large pole piece and cannot realize an ultrathin lithium supplementing effect.
In order to achieve the above purpose, the present invention provides the following technical solutions: a double-sided powder spraying and lithium supplementing process comprises the following steps:
step one: the winding roller at the inlet end of the A-side powder spraying machine unwinds the polar plate strip;
step two: feeding the unreeled pole piece belt into an A-side powder sprayer for powder spraying;
step three: the pole piece belt after powder spraying sequentially passes through an electrostatic generator and an electrostatic removing device;
step four: the pole piece belt after the powder spraying on the surface A is rolled by a first group of rollers;
step five: because the rolling and unwinding path of the powder supplementing of the B surface is longer, in order to prevent the film-feeding position of the pole piece from deviating from the central line, correction is required to be carried out by a correction machine before the powder supplementing of the B surface is carried out, and the center of the pole piece belt is aligned with the centers of the powder spraying machine of the B surface and the second group of rollers;
step six: the pole piece belt enters a B-side powder sprayer for powder spraying;
step seven: the pole piece belt after powder spraying passes through the static generator and the static eliminating device again in sequence;
step eight: rolling the pole piece belt subjected to the powder spraying on the surface B through a second group of rolling rollers;
step nine: sequentially passing through an A-side CCD camera and a B-side CCD camera;
step ten: labeling is carried out through a labeling machine, and the pole piece belt is wound up through a winding roller at the outlet end of the labeling machine.
The pole piece belt is of a strip-shaped structure which is formed by connecting a plurality of pole pieces which are not cut and is in a rolling shape, the surface A and the surface B respectively refer to the upper surface and the lower surface of the pole piece belt, and the roller carries out active rolling and unrolling operation through a servo motor.
The automatic closed-loop control between the frequency of the electromagnetic oscillator of the powder spraying mechanism and the pole piece belt speed ensures the balance between the pole piece belt speed and the oscillation frequency of the electromagnetic oscillator, and avoids the situation that one is too fast, the other is too slow or the other is too slow.
The number of the electrostatic generators is two, the electrostatic generators are respectively arranged on the A surface and the B surface of the pole piece belt, the electrostatic generators adopt high-voltage electrostatic generators, the electrostatic generators are used for injecting static electricity into lithium powder particles, and the A surface and the B surface of the pole piece belt are ensured to be capable of paving lithium powder through the static electricity.
The number of the static removing devices is two, one of the static removing devices is arranged at the rear of the powder scattering machine on the surface A, the other static removing device is arranged at the rear of the powder scattering machine on the surface B, and the two static removing devices of the static removing devices are respectively arranged on the surface A and the surface B of the pole piece belt.
The inner sides of gaps between rolling surfaces of the two groups of rolling rollers are respectively provided with a protective film, and the protective films are moved in a mode of unreeling and reeling by adopting a winding roller.
The protective film comprises a PET film serving as a base layer, and the surface of the PET film is uniformly coated with anti-sticking silicone oil.
The surface of the pole piece belt is provided with a plurality of groups of Mark holes, the number of each group of Mark holes is 4, the Mark holes are uniformly distributed in a rectangular shape, and each group of Mark holes is used for positioning one pole piece.
The detection positions of the A-side CCD camera and the B-side CCD camera are the positioning area of each group of Mark points, and the labeling point of the labeling machine is positioned at the tail part of each group of Mark points by at least 10 mm.
An active traction mechanism is arranged between the powder sprayer on the surface A and the powder sprayer on the surface B, and the pole piece belt is wound on the active traction mechanism.
Compared with the prior art, the invention has the beneficial effects that:
1. through two sets of powder sprayers and assorted auxiliary structure that set up, can accomplish the operation of two-sided moisturizing lithium through single processing, need not assist through the transfer membrane, the moisturizing lithium effect is better, and efficiency is higher.
2. Through the static generator and the static-removing device who set up, provide the static even structure behind the benefit lithium, because part position can be spilt and lead to the lithium powder to produce the group, this kind of setting is when rolling through the roller, can avoid the group to receive the extrusion and lead to the pole piece to produce uneven problem, in addition the cooperation roller, can form thinner more even benefit lithium.
3. Because the driving mode of the roller matched with the driving traction mechanism is adopted, the surface of the pole piece belt can be ensured to be always in a flat state due to pulling in the driving process, and therefore, the pole piece belt with larger width can also supplement lithium even in the driving process, and the application range is wider.
Drawings
FIG. 1 is a schematic illustration of a process flow of the present invention;
FIG. 2 is a schematic diagram showing the positions of Mark holes according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, the present invention provides a technical solution: a double-sided powder spraying and lithium supplementing process comprises the following steps:
step one: the winding roller at the inlet end of the A-side powder spraying machine unwinds the polar plate strip;
step two: feeding the unreeled pole piece belt into an A-side powder sprayer for powder spraying;
step three: the pole piece belt after powder spraying sequentially passes through an electrostatic generator and an electrostatic removing device;
step four: the pole piece belt after the powder spraying on the surface A is rolled by a first group of rollers;
step five: because the rolling and unwinding path of the powder supplementing of the B surface is longer, in order to prevent the film-feeding position of the pole piece from deviating from the central line, correction is required to be carried out by a correction machine before the powder supplementing of the B surface is carried out, and the center of the pole piece belt is aligned with the centers of the powder spraying machine of the B surface and the second group of rollers;
step six: the pole piece belt enters a B-side powder sprayer for powder spraying;
step seven: the pole piece belt after powder spraying passes through the static generator and the static eliminating device again in sequence;
step eight: rolling the pole piece belt subjected to the powder spraying on the surface B through a second group of rolling rollers;
step nine: sequentially passing through an A-side CCD camera and a B-side CCD camera;
step ten: labeling is carried out through a labeling machine, and the pole piece belt is wound up through a winding roller at the outlet end of the labeling machine.
The pole piece belt is of a winding-shaped belt structure formed by connecting a plurality of pole pieces which are not cut, the surface A and the surface B respectively refer to the upper surface and the lower surface of the pole piece belt, the winding roller performs active winding and unwinding operation through a servo motor, namely, active driving control is performed through a control signal, automatic closed-loop control is performed between the frequency of an electromagnetic oscillator of the powder spraying mechanism and the belt speed taken away by the pole pieces, the belt speed of the pole piece belt and the frequency of the electromagnetic oscillator can be kept balanced in the working process, the powder spraying speed is fast when the belt speed is fast, the powder spraying speed is slow when the belt speed is slow, the powder spraying speed per unit area of the pole piece belt is kept uniform, and the problem that the powder spraying speed is too fast and the belt speed is too slow is avoided, and vice versa.
The electrostatic generator is used for injecting static electricity into lithium powder particles, the lithium powder particles are mutually repelled through the electrostatic generator, and a tiled state is formed, so that the effect of dispersing bulk lithium powder can be achieved, and the uniformity of the lithium powder is ensured;
in addition, in order to guarantee that the effect of even tiling can be reached on both sides of passing through pole piece area, the quantity of electrostatic generator is two, sets up respectively in the A face and the B face of pole piece area.
In order to prevent the electrostatic charged lithium powder from generating adsorption phenomenon after contacting with the grinding roller or the protective film, the electrostatic removing device is required to carry out electrostatic removing treatment before grinding, in addition, although lithium powder particles are in a uniformly paved state, a certain thickness still exists, in order to prevent the lithium powder at the bottom from still having static electricity, the number of the electrostatic removing devices is two, one of the two groups is arranged at the rear of the powder spraying machine on the surface A, the other group is arranged at the rear of the powder spraying machine on the surface B, the two electrostatic removing devices of the two groups are respectively arranged on the surface A and the surface B of the pole piece belt, the electrostatic removing devices carry out electrostatic effect on the two surfaces of the pole piece belt, the static electricity of the lithium powder is completely removed, and the electrostatic charged lithium powder is prevented from adsorbing the grinding roller or the protective film in the subsequent operation.
Because lithium powder is very soft metal, can paste very easily on the compression roller in rolling the in-process, consequently want to protect the roller that contacts with lithium powder, all set up the protection film in the clearance inboard between the rolling face of two sets of rollers, the protection film adopts the roller to unreel, the mode of rolling moves, separates lithium powder and roller through the protection film, avoids the problem of adhesion to adopt the roller to unreel, the protection film that the mode of rolling moved can conveniently clear up and operation such as replacement.
Because the protective film can still be pressed into the surface of the protective film by partial lithium powder due to pressure in the extrusion process, the PET film is used as the protective film, and the surface of the PET film is uniformly coated with a layer of anti-sticking silicone oil, and when the anti-sticking silicone oil is used, one surface coated with the anti-sticking silicone oil needs to be contacted with the pole piece.
The pole piece strip is provided with a plurality of pole pieces, the pole pieces can be used independently after being cut, a plurality of groups of Mark holes are formed in the surface of the pole piece strip for guaranteeing that the pole pieces can be processed by adopting a roller, the number of the Mark holes in each group is 4 and is uniformly rectangular, each group of Mark holes is used for positioning one pole piece, the detection positions of the CCD camera on the A surface and the CCD camera on the B surface are the area of each group of Mark point positioning, the labeling point of the labeling machine is positioned at the tail part of each group of Mark points by at least 10mm, the Mark holes are used as optical positioning points for positioning a single pole piece, and the defect on the surface of the single pole piece can be accurately detected by two CCD cameras after processing.
The pole piece belt is wound on the active traction mechanism, the active traction mechanism refers to a roller driven by an independent servo motor, and the active traction mechanism is an existing structure and is only briefly described in position.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The double-sided powder spraying and lithium supplementing process is characterized by comprising the following steps of:
step one: the winding roller at the inlet end of the A-side powder spraying machine unwinds the polar plate strip;
step two: feeding the unreeled pole piece belt into an A-side powder sprayer for powder spraying;
step three: the pole piece belt after powder spraying sequentially passes through an electrostatic generator and an electrostatic removing device;
step four: the pole piece belt after the powder spraying on the surface A is rolled by a first group of rollers;
step five: correcting the deviation by a deviation correcting machine;
step six: the pole piece belt enters a B-side powder sprayer for powder spraying;
step seven: the pole piece belt after powder spraying passes through the static generator and the static eliminating device again in sequence;
step eight: rolling the pole piece belt subjected to the powder spraying on the surface B through a second group of rolling rollers;
step nine: sequentially passing through an A-side CCD camera and a B-side CCD camera;
step ten: labeling by a labeling machine, and rolling the pole piece belt by a roller at the outlet end of the labeling machine;
the surface A and the surface B respectively refer to the upper surface and the lower surface of the pole piece belt, the number of the electrostatic generators is two, the electrostatic generators are respectively arranged on the surface A and the surface B of the pole piece belt, the electrostatic generators adopt high-voltage electrostatic generators, and the electrostatic generators are used for injecting static electricity into lithium powder particles;
the number of the static removing devices is two, one of the two static removing devices is arranged behind the powder scattering machine on the surface A, the other static removing device is arranged behind the powder scattering machine on the surface B, and the two static removing devices of the two static removing devices are respectively arranged on the surface A and the surface B of the pole piece belt;
protective films are arranged on the inner sides of gaps between rolling surfaces of the two groups of rolling rollers, and the protective films move in a mode of unreeling and reeling by adopting a winding roller; the protective film comprises a PET film serving as a base layer, and the surface of the PET film is uniformly coated with anti-sticking silicone oil;
the surface of the pole piece belt is provided with a plurality of groups of Mark holes, the number of each group of Mark holes is 4, the Mark holes are uniformly distributed in a rectangular shape, and each group of Mark holes is used for positioning one pole piece; the detection positions of the A-side CCD camera and the B-side CCD camera are the positioning areas of Mark points of each group, and the labeling points of the labeling machine are positioned at the tail part of the Mark points of each group by at least 10 mm.
2. The double-sided powder spraying and lithium supplementing process according to claim 1, wherein the process is characterized in that: the pole piece belt is of a strip-shaped structure which is formed by connecting a plurality of pole pieces which are not cut and is in a winding shape, and the winding roller performs active winding and unwinding operation through a servo motor.
3. The double-sided powder spraying and lithium supplementing process according to claim 1, wherein the process is characterized in that: and the frequency of an electromagnetic oscillator of the powder spraying mechanism and the speed of a pole piece belt taken away are automatically controlled in a closed loop.
4. The double-sided powder spraying and lithium supplementing process according to claim 1, wherein the process is characterized in that: an active traction mechanism is arranged between the powder sprayer on the surface A and the powder sprayer on the surface B, and the pole piece belt is wound on the active traction mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210362518.4A CN114759166B (en) | 2022-04-07 | 2022-04-07 | Double-sided powder spraying and lithium supplementing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210362518.4A CN114759166B (en) | 2022-04-07 | 2022-04-07 | Double-sided powder spraying and lithium supplementing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114759166A CN114759166A (en) | 2022-07-15 |
| CN114759166B true CN114759166B (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210362518.4A Active CN114759166B (en) | 2022-04-07 | 2022-04-07 | Double-sided powder spraying and lithium supplementing process |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1424499A (en) * | 1973-08-23 | 1976-02-11 | Berstorff Gmbh Masch Hermann | Method of and apparatus for the draw-in of powdered material into a roller gap |
| CN103208612A (en) * | 2013-03-25 | 2013-07-17 | 东莞新能源科技有限公司 | Continuous lithium powder replenishing method for both sides of lithium ion battery negative plate |
| CN107123785A (en) * | 2016-02-25 | 2017-09-01 | 宁德时代新能源科技股份有限公司 | Lithium system is mended to pole piece |
| CN107591517A (en) * | 2017-09-13 | 2018-01-16 | 东莞市沃泰通新能源有限公司 | A kind of device and method that lithium is continuously mended to anode plate for lithium ionic cell |
| CN209322150U (en) * | 2018-11-14 | 2019-08-30 | 江苏万达新能源科技股份有限公司 | A kind of lithium battery cutting machine with function of eliminating static |
| CN209651513U (en) * | 2018-12-28 | 2019-11-19 | 中材锂膜有限公司 | A kind of novel lithium film winding Destaticizing device |
| CN111774195A (en) * | 2020-06-23 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Lithium device is mended to negative pole piece lithium powder |
| CN112397688A (en) * | 2020-11-16 | 2021-02-23 | 东莞塔菲尔新能源科技有限公司 | Lithium system is mended to pole piece |
-
2022
- 2022-04-07 CN CN202210362518.4A patent/CN114759166B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1424499A (en) * | 1973-08-23 | 1976-02-11 | Berstorff Gmbh Masch Hermann | Method of and apparatus for the draw-in of powdered material into a roller gap |
| CN103208612A (en) * | 2013-03-25 | 2013-07-17 | 东莞新能源科技有限公司 | Continuous lithium powder replenishing method for both sides of lithium ion battery negative plate |
| CN107123785A (en) * | 2016-02-25 | 2017-09-01 | 宁德时代新能源科技股份有限公司 | Lithium system is mended to pole piece |
| CN107591517A (en) * | 2017-09-13 | 2018-01-16 | 东莞市沃泰通新能源有限公司 | A kind of device and method that lithium is continuously mended to anode plate for lithium ionic cell |
| CN209322150U (en) * | 2018-11-14 | 2019-08-30 | 江苏万达新能源科技股份有限公司 | A kind of lithium battery cutting machine with function of eliminating static |
| CN209651513U (en) * | 2018-12-28 | 2019-11-19 | 中材锂膜有限公司 | A kind of novel lithium film winding Destaticizing device |
| CN111774195A (en) * | 2020-06-23 | 2020-10-16 | 合肥国轩高科动力能源有限公司 | Lithium device is mended to negative pole piece lithium powder |
| CN112397688A (en) * | 2020-11-16 | 2021-02-23 | 东莞塔菲尔新能源科技有限公司 | Lithium system is mended to pole piece |
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| Publication number | Publication date |
|---|---|
| CN114759166A (en) | 2022-07-15 |
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Country or region after: China Address after: No. 20 Majun Street, Dongyong Town, Nansha District, Guangzhou City, Guangdong Province, 511400 Applicant after: Guangdong Jiemeng Intelligent Equipment Co.,Ltd. Address before: 510000 No.18, MafA street, Dongyong Town, Nansha District, Guangzhou City, Guangdong Province Applicant before: Guangdong jiemeng Intelligent Equipment Co.,Ltd. Country or region before: China |
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