CN114759166A - Double-sided powder spraying and lithium supplementing process - Google Patents
Double-sided powder spraying and lithium supplementing process Download PDFInfo
- Publication number
- CN114759166A CN114759166A CN202210362518.4A CN202210362518A CN114759166A CN 114759166 A CN114759166 A CN 114759166A CN 202210362518 A CN202210362518 A CN 202210362518A CN 114759166 A CN114759166 A CN 114759166A
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- Prior art keywords
- pole piece
- lithium
- piece belt
- powdering
- rolling
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- 239000000843 powder Substances 0.000 title claims abstract description 68
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 53
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005507 spraying Methods 0.000 title claims abstract description 29
- 230000008569 process Effects 0.000 title claims abstract description 24
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 37
- 230000003068 static effect Effects 0.000 claims abstract description 31
- 238000000227 grinding Methods 0.000 claims abstract description 27
- 238000004804 winding Methods 0.000 claims abstract description 21
- 235000013312 flour Nutrition 0.000 claims abstract description 18
- 238000002372 labelling Methods 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 8
- 229920002799 BoPET Polymers 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 239000013589 supplement Substances 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000012937 correction Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229910000733 Li alloy Inorganic materials 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 239000012528 membrane Substances 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
- 230000002950 deficient Effects 0.000 description 1
- 239000000463 material 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
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
Abstract
The invention discloses a double-sided powder spraying and lithium supplementing process, which comprises the following steps: the method comprises the following steps: a winding roller at the inlet end of the flour sprayer A unreels the pole piece belt; step two: feeding the unreeled pole piece belt into a flour A powdering machine for powdering; step three: the pole piece belt after powder spraying sequentially passes through an electrostatic generator and a static removing device; step four: rolling the pole piece belt with the powder sprayed on the surface A by a first group of rolling rollers; step five: correcting the deviation through a deviation correcting machine; step six: the pole piece belt enters a B-surface powdering machine for powdering; step seven: the pole piece belt after powder spraying sequentially passes through the electrostatic generator and the static removing device again; step eight: rolling the pole piece belt subjected to powder spraying on the B surface by a second group of rolling rollers, and rolling the pole piece belt by a rolling roller at the outlet end of the labeling machine; according to the double-sided lithium supplement device, the two groups of powder spraying machines and the matched auxiliary structures are arranged, so that double-sided lithium supplement operation can be completed only through single processing, the lithium supplement effect is better, and the efficiency is higher.
Description
Technical Field
The invention relates to the field of lithium battery lithium supplement processes, in particular to a double-sided powder spraying lithium supplement process.
Background
A lithium battery is a battery using a nonaqueous electrolyte solution and 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 lithium battery adopts the pole piece material of lithium metal or lithium alloy, consequently when processing, usually need to mend lithium operation, current mend lithium mode generally is assisted through the transfer membrane, mends lithium to the both sides of pole piece through the mode of pressfitting, and this kind of mode can't mend lithium to the pole piece that broad width is big, and the thickness of mending lithium is higher moreover, can not realize ultra-thin mend lithium effect.
Disclosure of Invention
The invention aims to provide a double-sided powder spraying and lithium supplementing process, which aims to solve the problems that the existing lithium supplementing mode cannot supplement lithium for a wide and large pole piece and cannot realize an ultrathin lithium supplementing effect.
In order to achieve the purpose, the invention provides the following technical scheme: a double-sided powder spraying and lithium supplementing process comprises the following steps:
the method comprises the following steps: a winding roller at the inlet end of the flour sprayer A unreels the pole piece belt;
step two: the unreeled pole piece belt enters an A-surface powder sprinkling machine for sprinkling powder;
step three: the pole piece belt after powder spraying sequentially passes through an electrostatic generator and a static removing device;
step four: rolling the pole piece belt with the powder sprayed on the surface A by a first group of rolling rollers;
step five: because the path of the B-surface powder supplementing rolling from the pole piece unreeling is longer, in order to prevent the position of a pole piece film running from deviating from the central line, the correction is carried out by a correction machine before the B-surface powder supplementing rolling is carried out, and the center of a pole piece belt is ensured to be aligned with the centers of the B-surface powder sprinkling machine and the second group of grinding rollers;
step six: the pole piece belt enters a powder spraying machine of the B surface for spraying powder;
step seven: the pole piece belt after powder spraying sequentially passes through the static generator and the static removing device again;
step eight: rolling the pole piece belt with the powder sprayed on the surface B by a second group of rolling rollers;
step nine: sequentially passes through the A-plane CCD camera and the B-plane CCD camera;
step ten: labeling is carried out through a labeling machine, and the pole piece belt is wound through a winding roller at the outlet end of the labeling machine.
The pole piece belt is a winding belt-shaped structure formed by connecting a plurality of uncut pole pieces, the surface A and the surface B respectively refer to the upper surface and the lower surface of the pole piece belt, and the winding roller carries out active winding and unwinding operation through a servo motor.
The frequency of the electromagnetic oscillator of the powder sprinkling mechanism and the speed of the pole piece belt taking away are automatically controlled in a closed loop mode, the balance between the speed of the pole piece belt taking away and the oscillation frequency of the electromagnetic oscillator is guaranteed, and the situations that one is too fast, the other is too slow or one is too slow and the other is too fast are avoided.
The number of the electrostatic generators is two, the two 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, the electrostatic generators are used for injecting static electricity into lithium powder particles, and the surface A and the surface B of the pole piece belt can be guaranteed to be capable of paving the lithium powder through the static electricity.
The number of the static removing devices is two, each group is two, one group is arranged behind the flour A powdering machine, the other group is arranged behind the flour B powdering machine, and the two static removing devices of each group are respectively arranged on the flour A and the flour B of the pole piece belt.
Wherein, it is two sets of the clearance inboard between the face of rolling of grinding roller all is provided with the protection film, the protection film adopts the mode that the winding up roller unreeled, rolling to remove.
The protective film comprises a PET film serving as a base layer, and anti-sticking silicone oil is uniformly coated on the surface of the PET film.
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 one pole piece is positioned in each group of Mark holes.
The detection positions of the A-surface CCD camera and the B-surface CCD camera are the areas for positioning each group of Mark points, and the labeling point of the labeling machine is positioned at the position of at least 10mm at the tail part of each group of Mark points.
And an active traction mechanism is arranged between the flour A powdering machine and the flour B powdering machine, 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 flour scattering machines and assorted auxiliary structure that set up, can only single processing can accomplish the operation of two-sided lithium of mending, need not assist through the transfer membrane, mend the lithium effect better, efficiency is higher.
2. Through the static generator and the static-removing device who set up, provide the even structure of static after mending lithium, because partial position can spill the powder and lead to the lithium powder to produce the agglomeration, this kind of setting can avoid the agglomeration to receive the extrusion and lead to the pole piece to produce unevenness's problem when rolling through the edge runner, and the cooperation edge runner can form thinner more even mends lithium effect in addition.
3. Because the transmission mode that the winding roller cooperates with the active traction mechanism is adopted, the surface of the pole piece belt can be kept in a flat state all the time due to pulling in the transmission process, and therefore, the pole piece belt with a large width can also supplement lithium even in time, and the application range is wide.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
fig. 2 is a schematic diagram of the position of the Mark hole of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present 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:
the method comprises the following steps: a winding roller at the inlet end of the flour sprayer A unreels the pole piece belt;
step two: the unreeled pole piece belt enters an A-surface powder sprinkling machine for sprinkling powder;
step three: the pole piece belt after powder spraying sequentially passes through an electrostatic generator and a static removing device;
step four: rolling the pole piece belt with the powder sprayed on the surface A by a first group of rolling rollers;
step five: because the path of the B-surface powder supplementing rolling from the pole piece unreeling is longer, in order to prevent the position of a pole piece film running from deviating from the central line, the correction is carried out by a correction machine before the B-surface powder supplementing rolling is carried out, and the center of a pole piece belt is ensured to be aligned with the centers of the B-surface powder sprinkling machine and the second group of grinding rollers;
step six: the pole piece belt enters a B-surface powdering machine for powdering;
step seven: the pole piece belt after powder spraying sequentially passes through the static generator and the static removing device again;
step eight: rolling the pole piece belt with the powder sprayed on the surface B by a second group of rolling rollers;
step nine: sequentially passes through the A-plane CCD camera and the B-plane CCD camera;
step ten: labeling is carried out through a labeling machine, and the pole piece belt is wound through a winding roller at the outlet end of the labeling machine.
The pole piece belt is a belt-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, the winding roller carries out active winding and unwinding operation through a servo motor, namely, active driving control is carried out through a control signal, automatic closed-loop control is carried out between the frequency of an electromagnetic oscillator of the powder spraying mechanism and the speed of the pole piece belt, the belt conveying 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 high when the belt conveying speed is high, the powder spraying speed is low when the belt conveying speed is low, the powder spraying uniformity of the unit area of the pole piece belt is kept, the problem that the powder spraying speed is too high and the belt conveying speed is too low can not occur, and vice versa.
The static generator is used for injecting static electricity into the lithium powder particles, the static electricity is injected into the lithium powder particles through the static generator, the lithium powder particles are mutually repelled to form a flat state, so that the effect of scattering agglomerated lithium powder can be achieved, and the uniformity of the lithium powder is ensured;
in addition, for guaranteeing that the two surfaces of the pole piece belt passing through can reach the effect of even tiling, the number of the electrostatic generators is two, and the two electrostatic generators are respectively arranged on the surface A and the surface B of the pole piece belt.
In order to prevent the electrostatic lithium powder from being adsorbed after contacting with the rolling roller or the protective film, the electrostatic removing device is required to be used for removing static before rolling, in addition, although the lithium powder particles are in a uniform and flat-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, each group is two, one group is arranged behind the A-surface powdering machine, the other group is arranged behind the B-surface powdering machine, the two electrostatic removing devices of each group are respectively arranged on the A surface and the B surface of the pole piece belt, the electrostatic removing devices perform electrostatic effect on the two surfaces of the pole piece belt, the static electricity of the lithium powder is completely removed, and the electrostatic lithium powder is prevented from being adsorbed on the rolling roller or the protective film in the subsequent operation.
Because lithium powder is a very soft metal, can paste on the compression roller very easily rolling the in-process, consequently will protect the roller with lithium powder contact, the clearance inboard between the face of rolling of two sets of rollers all sets up the protection film, the protection film adopts the winding up roller to unreel, the mode of rolling removes, separate lithium powder and winding up roller through the protection film, avoid the problem of adhering, and adopt the winding up roller to unreel, the protection film that the mode of rolling removed can conveniently clear up and replace the operation such as.
Because the protective film can cause partial lithium powder to be pressed into the surface of the protective film due to pressure in the extrusion process, the PET film is used as the protective film, a layer of anti-sticking silicone oil is uniformly coated on the surface of the PET film, and when the protective film is used, the surface coated with the anti-sticking silicone oil needs to be in contact with the pole piece.
Wherein, there is a plurality of pole piece on the coiled sheet area, the pole piece needs to cut and just can carry out solitary use, can adopt the winding up roller to process the pole piece for guaranteeing, a plurality of groups Mark hole have been seted up on the surface in pole piece area, the quantity in every group Mark hole is 4, be even rectangular distribution, a pole piece is fixed a position to every group Mark hole, the detection position of A face CCD camera and B face CCD camera is the area of every group Mark point location, the subsides Mark point of labeller is located the position of the afterbody of every group Mark point of 10mm at least, fix a position single pole piece as optical locating point through the Mark hole, guarantee can be through the accurate flaw on single pole piece surface of detection of two CCD cameras after processing, as long as there is a flaw in the area of the pole piece of Mark hole location, just judge defective article.
The pole piece belt is wound on the active traction mechanism, the active traction mechanism refers to a winding roller driven by an independent servo motor, and the active traction mechanism is of an existing structure and is only briefly described in position.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A double-sided powder spraying and lithium supplementing process is characterized by comprising the following steps:
the method comprises the following steps: a winding roller at the inlet end of the flour sprayer A unreels the pole piece belt;
step two: the unreeled pole piece belt enters an A-surface powder sprinkling machine for sprinkling powder;
step three: the pole piece belt after powder spraying sequentially passes through an electrostatic generator and a static removing device;
step four: rolling the pole piece belt with the powder sprayed on the surface A by a first group of rolling rollers;
step five: correcting the deviation through a deviation correcting machine;
step six: the pole piece belt enters a powder spraying machine of the B surface for spraying powder;
step seven: the pole piece belt after powder spraying sequentially passes through the static generator and the static removing device again;
step eight: rolling the pole piece belt with the powder sprayed on the surface B by a second group of rolling rollers;
step nine: sequentially passing through an A-plane CCD camera and a B-plane CCD camera;
step ten: labeling is carried out through a labeling machine, and the pole piece belt is wound through a winding roller at the outlet end of the labeling machine.
2. The double-sided powdering and lithium-supplementing process according to claim 1, characterized in that:
the pole piece belt is a belt-shaped structure which is formed by connecting a plurality of uncut pole pieces 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 rolling roller carries out active winding and unwinding operation through a servo motor.
3. The double-sided powdering and lithium supplementing process according to claim 1, characterized in that:
and the frequency of an electromagnetic oscillator of the powder spraying mechanism and the speed of a pole piece carrying belt are automatically controlled in a closed loop mode.
4. The double-sided powder spraying and lithium supplementing process according to claim 2, characterized in that:
the quantity of static generator is two, sets up respectively at the A face and the B face in pole piece area, static generator adopts high-pressure formula static generator, static generator is used for injecting static for lithium powder granule.
5. The double-sided powdering and lithium supplementing process according to claim 4, characterized in that:
the number of the static removing devices is two, each group is two, one group is arranged behind the flour A powdering machine, the other group is arranged behind the flour B powdering machine, and the two static removing devices of each group are respectively arranged on the flour A and the flour B of the pole piece belt.
6. The double-sided powdering and lithium-supplementing process according to claim 1, characterized in that:
two sets of the inboard protection film that all is provided with in clearance between the face of rolling of roller, the protection film adopts the mode that the winding up roller unreeled, rolling to remove.
7. The double-sided powdering and lithium-supplementing process according to claim 6, characterized in that:
the protective film comprises a PET film serving as a base layer, and anti-sticking silicone oil is uniformly coated on the surface of the PET film.
8. The double-sided powdering and lithium-supplementing process according to claim 1, characterized in that:
a plurality of groups of Mark holes are formed in the surface of the pole piece belt, the number of each group of Mark holes is 4, the Mark holes are uniformly distributed in a rectangular shape, and one pole piece is positioned in each group of Mark holes.
9. The double-sided powdering and lithium-supplementing process according to claim 8, characterized in that:
the detection positions of the A-surface CCD camera and the B-surface CCD camera are the areas for positioning each group of Mark points, and the labeling point of the labeling machine is positioned at the position of at least 10mm at the tail part of each group of Mark points.
10. The double-sided powdering and lithium-supplementing process according to claim 1, characterized in that:
an active traction mechanism is arranged between the flour A powdering machine and the flour B powdering machine, 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 |
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| 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 |
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| Publication Number | Publication Date |
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| CN114759166A true CN114759166A (en) | 2022-07-15 |
| CN114759166B CN114759166B (en) | 2024-04-12 |
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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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| CN114759166B (en) | 2024-04-12 |
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