CN113210230A - Pole piece coating drying device and drying method - Google Patents
Pole piece coating drying device and drying method Download PDFInfo
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- CN113210230A CN113210230A CN202110309126.7A CN202110309126A CN113210230A CN 113210230 A CN113210230 A CN 113210230A CN 202110309126 A CN202110309126 A CN 202110309126A CN 113210230 A CN113210230 A CN 113210230A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
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Abstract
The invention discloses a pole piece coating drying device, which comprises: the pole piece conveying mechanism is used for enabling the coated pole piece material roll to continuously pass through the laser drying area; the isolation cover is used for relatively isolating the laser drying area from the external environment; laser light source system, the setting is in the cage for output laser is rolled up with dry pole piece material, it includes a plurality of laser module, every laser module includes a plurality of laser unit that the width direction of rolling is rolled up along the pole piece, make every laser module produce the little regional facula that is no less than the width of rolling is rolled up to the pole piece, a plurality of laser module are rolled up length direction along the pole piece and are arranged, make the little regional facula that a plurality of laser module produced roll up length direction along the pole piece and splice into the big regional facula. The invention also discloses a method for drying the pole piece coating. The invention can realize uniform drying on the whole production line, so that the drying and forming efficiency of the pole piece coating is high and the quality is good.
Description
Technical Field
The invention relates to the field of production and manufacturing of lithium ion batteries, in particular to a drying device and a drying method for a pole piece coating.
Background
The production of the pole piece is the basis for forming the lithium ion battery, the control of dust particles and moisture is the most key control point in the production process, wherein the dust particles are mainly solved by environmental control in a production line, and a dust removal device is matched with the dust removal device; the moisture is mainly controlled through the drying line, in order to match with high production rate, the length of the lengthy drying line can reach about 15 meters, the equipment has large volume and occupies large space, and the energy loss and the space occupation are both great cost expenditure.
CN201611228865.9 discloses a drying method of an electrode, which refers to a scheme of drying a pole piece by using laser, but only laser drying is used as a loop in a pole piece drying process, and does not take on a main function.
In addition, the light spots output by the existing laser are mostly micron-sized circular light spots, the light spots can be modulated into light spots with specific shapes through a specially-customized optical system, but the light spots can be increased in small amplitude and cannot form large-area light spots, so that the drying of the whole area can be completed only by circularly scanning the surface of the pole piece through the light spots, but the drying coating has non-uniformity due to the non-uniformity of the energy distribution of the light spots and the time difference of scanning positions.
Disclosure of Invention
The invention aims to provide a pole piece coating drying device and a pole piece coating drying method, which can realize pole piece drying only through laser radiation.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pole piece coating drying device comprising:
the pole piece conveying mechanism is used for enabling the coated pole piece material roll to continuously pass through the laser drying area;
the isolation cover is used for isolating the laser drying area from the external environment;
laser light source system, the setting is in the cage for output laser is rolled up with dry pole piece material, it includes a plurality of laser module, every laser module includes a plurality of laser unit that the width direction of rolling is rolled up along the pole piece, make every laser module produce the little regional facula that is no less than the width of rolling is rolled up to the pole piece, a plurality of laser module are rolled up length direction along the pole piece and are arranged, make the little regional facula that a plurality of laser module produced roll up length direction along the pole piece and splice into the big regional facula.
Further, the apparatus further comprises:
the power supply module is used for independently controlling the output power of each laser module;
the infrared thermometer is used for measuring the temperature of the surface of the pole piece material roll;
and the data acquisition instrument is used for acquiring temperature data acquired by the infrared thermometer and is favorable for adjusting the output power of each laser module in real time through the power supply module.
Furthermore, the isolating cover is provided with an air outlet at the pole piece material feeding side, an air inlet at the pole piece material discharging side, and an air blowing device is arranged at one side of the isolating cover close to the air inlet and used for blowing the volatile solvent away from the dried area in the coating drying process and discharging the solvent through the air outlet.
Preferably, the pole piece transmission mechanism includes:
the unwinding mechanism is used for unwinding the pole piece material roll;
the belt pulley is used for transmitting the pole piece material roll at a constant speed;
and the winding mechanism is used for collecting the dried pole piece material roll.
Preferably, the laser module comprises;
cooling the heat sink plate and the package cavity;
the laser units are arranged on one sides of the cooling heat sink plate and the packaging cavity;
the cooling water channel is arranged on the other side of the cooling heat sink plate and the packaging cavity;
and the micro-optical lens is arranged at the bottoms of the cooling heat sink plate and the packaging cavity, is positioned in the light paths of the laser units, and is used for converting the diffused laser light into parallel light or diffused light with a small diffusion angle so as to form small-area light spots in a regular shape.
Preferably, the light spot of the small area is 10-200 mm long and 10-200 mm wide.
Preferably, the spacing distance between the laser modules is 0-100 mm, and the distance from the light emitting surface of each laser module to the surface of the coating is 50-500 mm.
Preferably, the laser wavelength output by the laser light source system is 760nm to 1100 nm.
Preferably, the energy density output to the surface of the pole piece material roll by the laser light source system is 5-50W/cm2。
A pole piece coating drying method comprises the following steps:
arranging a pole piece transmission mechanism, and continuously passing the coated pole piece material roll through a laser drying area;
arranging an isolation cover to relatively isolate the laser drying area from the external environment;
the laser module is arranged along the length direction of the pole piece material roll, so that the small-area light spots generated by the laser modules are spliced into a large-area light spot along the length direction of the pole piece material roll;
arranging a power supply module for independently controlling the output power of each laser module;
an infrared temperature measurement system is arranged to measure the drying temperature of the pole piece material roll in real time, so that the output power of each laser module can be adjusted in real time through the power supply module;
an air outlet is arranged on the pole piece material roll feeding side of the isolation cover, an air inlet is arranged on the pole piece material roll discharging side of the isolation cover, and an air blowing device is arranged on one side, close to the air inlet, in the isolation cover, and is used for blowing the volatile solvent in the coating drying process away from a dried area and discharging the solvent through the air outlet.
Compared with the prior art, the invention has the advantages that:
1. the pole piece drying is realized by laser irradiation, the energy utilization rate is high, compared with the modes such as infrared lamp irradiation, the energy-saving drying device has the advantages of energy conservation, small occupied area of equipment and strong drying effect.
2. Ordinary laser output mode, there are the not concentrated, energy distribution is uneven, the small scheduling problem of coverage area of beam dispersion energy, this application utilizes lens to carry out suitable plastic to the laser beam of output, can reduce the divergence of light beam and realize the good large tracts of land facula of directive property to with the reasonable parallelly connected distribution of a plurality of modules, realize the facula concatenation of bigger area, can realize the homogenization drying on whole assembly line, make the dry shaping efficiency of pole piece coating high, of high quality.
Drawings
FIG. 1 is a schematic view of the structure of a drying apparatus according to the present invention;
FIG. 2 is a schematic diagram of a laser module according to the present invention;
description of reference numerals: 1-an unwinding mechanism; 2-a belt pulley; 3, air outlet; 4-a data acquisition instrument; 5-an infrared thermometer; 6-a power supply module; 7-laser light source system; 8-air inlet; 9-a blowing device; 10-a shielding case; 11-a winding mechanism;
701-a cooling water channel; 702-a laser unit; 703-cooling the heat sink plate and the package cavity; 704-micro-optical lens; 705-rectangular spot.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Examples
As shown in fig. 1, a pole piece coating drying device includes: the unwinding mechanism 1 is used for unwinding a pole piece material roll; the belt pulley 2 is used for transmitting the pole piece material roll at a constant speed; the air outlet 3 is used for exhausting air outwards to keep the air pressure of the drying environment balanced; the data acquisition instrument 4 is used for acquiring temperature data acquired by the infrared thermometer 5; the infrared thermometer 5 is used for measuring the temperature of the surface of the pole piece material roll and detecting the temperature change of the working surface; the power module 6 is used for controlling the output power of the laser; a laser light source system 7 for outputting laser light of a specified wavelength; the air inlet 8 is used for inputting dry gas without moisture to maintain clean environment; the blowing device 9 is used for enabling the volatilized solvent to move along the direction of air flow (the direction opposite to the movement of the pole piece), so as to avoid polluting the light emitting surface of the laser light source and the dried area of the pole piece; the isolation hood 10 is used for relatively isolating the drying environment from the external environment, and reducing the loss of drying heat and the influence of the external environment on the drying process; and the winding mechanism 11 is used for collecting the dried pole piece material roll.
When the device is used, a material roll which is coated passes through a laser drying area at a constant speed after being transported from the left unwinding mechanism 1 to the belt wheel 2, a laser light source system 7 of the laser drying area is connected with an external power module 6 through a lead, an infrared thermometer 5 is arranged near a laser light source and is connected with an external data acquisition instrument 4 through a data transmission line, an air blowing device 9 is arranged between the laser light source and a drying working surface (namely the surface of a pole piece) and is positioned at the tail end of the advancing direction of the pole piece, in the figure, the pole piece material roll is transmitted rightwards, the air blowing device is arranged at the right side of the laser light source, air flow blown out leftwards enables volatilized solvent to leave the drying area along the air flow direction, the influence of the solvent on the light emitting surface of the light source and the dried area of the pole piece is reduced, the drying area is relatively isolated from the external environment by an isolation cover 10, and the influence of the loss of drying heat and the external environment on the drying process is reduced, the air outlet 3 of 10 left sides top surfaces of cage keeps environmental pressure balance to the outside exhaust gas, and the air intake 9 of 10 right sides top surfaces of cage inputs the dry gas who does not contain moisture in order to maintain the cleanness in dry area, and winding mechanism 11 collects the pole piece material book that dry is accomplished.
The light spots output by a common laser are mostly micron-sized circular light spots, or the light spots can be modulated into light spots with specific shapes through a specially-customized optical system, but the light spots can be increased in small amplitude and cannot form large-area light spots, so that the drying of the whole area can be completed only by circularly scanning the surface of the pole piece through the light spots, but the drying coating has non-uniformity due to the non-uniformity of the energy distribution of the light spots and the time difference of scanning positions.
Therefore, the laser light source system 7 of the application is composed of a plurality of laser modules and used for outputting large-area laser spots to dry pole pieces, each laser module can be independently controlled and acts independently, the output power of each laser module can be the same, the laser modules can also be different, and then the multi-section drying function can be realized in a programmed mode. As shown in fig. 2, a single laser module mainly includes a cooling water channel 701, a plurality of laser units 702, a cooling heat sink plate and package cavity 703, and a micro-optical lens 704. The laser unit 702 may be a laser bar or a diode light emitting chip, and the micro optical lens 704 may be disposed separately or integrally, may be directly disposed in a light channel below the light source, and is not necessarily integrally packaged with the light source. Thus, the divergent laser source is changed into parallel light or divergent light with a very small divergence angle after passing through the micro-optical lens 704, so that a regular rectangular light spot 705 with the length of 10-200 mm and the width of 10-200 mm can be formed in a tunable mode.
The laser spot is not necessarily a regular rectangle, and may have other shapes, but all the purpose is to increase the area covered by the laser drying per unit time. Meanwhile, the micro-optical lens 704 is not limited in structural style and arrangement as long as the light source divergence can be improved.
When a single laser module works, a millimeter-sized small rectangular light spot 705 as shown in fig. 2 can be output, the pole pieces can be dried simultaneously in the range of the formed rectangular light spot, the drying is completed in the whole width direction at one time, and the scanning action of the light spot in the breadth is not needed. Although the basic drying function is provided, the drying efficiency is low, the laser irradiation can cover the whole material roll in the width direction under the scheme, the light spot in the length direction is still small and is limited by the matching of the product manufacturing technology and the cooling capacity, the size of the light spot which can be realized by a single laser module is limited, and when the material roll runs fast, the drying effect is poor, and the method is only suitable for a low-speed drying production line. The demand that will satisfy high efficiency automation line, still need utilize the unique coherence of laser, make a plurality of laser module and join in marriage in parallel and arrange along pole piece material book length direction in the drying line, through the mounted position of each laser module of reasonable ground layout, can realize the change of little regional facula to the large area facula to promote the homogeneity of the different regional energy distribution of facula, the state that whole production line was irradiated by the laser is unanimous, is favorable to realizing the dry shaping of homogenization to the pole piece coating more.
The power module 6 can be understood as a controller of laser, the output power of the laser can be adjusted, the active material coating on the surface of the current collector contains solute and solvent, the solute and the solvent absorb the laser in different degrees, and the phenomenon that the laser heats the coating to dry is finally shown, the larger the energy of the irradiated laser is, the higher the temperature generated by absorbing and converting the working surface material is, and therefore the drying temperature on the surface of the pole piece can be indirectly adjusted by adjusting the output power of the laser.
The combination of the infrared thermometer 5 and the data acquisition instrument 4 can enable the thermometer to measure the temperature of the laser irradiation drying position every few seconds or continuously, the stability of the drying process can be visually observed from the data acquisition instrument 4, if the drying temperature does not reach the standard, corresponding adjustment is timely made through the power module 6, and the normal circulation of a production line is ensured.
The laser wavelength is not limited to a certain waveband, the pole piece coating can generate a temperature effect as long as the laser with certain energy density can dry the pole piece, the selected laser waveband and the output laser energy do not damage active particles in the coating, the general active coating has better laser absorption property to short wavelength, but the comprehensive economic cost is preferably 760 nm-1100 nm.
The laser energy or energy density is preferably not to damage active particles in the active coating, and should not generate too high temperature to volatilize additives and adhesives in the coating, preferably, when infrared laser is adopted, the energy density on the working surface can be selected to be 5-50W/cm2More preferably 20W/cm2(ii) a When using green lasers and lasers with smaller wavelengths, the energy density can be reduced accordingly, due to the increased absorption of the material.
The working distance and the distance between the laser modules are determined by the performance of the modules, and parameters controlled by different types of modules (which refer to different wavelengths and powers of output light and different sizes of light spots) are different, but the final purpose is to effectively splice the light spots output by the modules, so that the light spots are expanded, and the light beams are coherent to generate the light spots with more uniform energy distribution, so that the pole piece coating is uniformly dried and formed. Preferably, the working distance can be selected, namely the distance from the light emitting surface of the laser module to the surface of the coating is 100-500 mm; the distance between the laser modules is 0-100 mm.
The lithium battery pole piece comprises the positive pole piece and the negative pole piece, the device can be used for drying the positive pole piece and the negative pole piece, meanwhile, the type of a drying coating is not limited, and coatings with different formulas only need to be subjected to change of a drying process.
In conclusion, the laser drying method is adopted to obviously reduce the occupied space of the production line, the laser beam with good directivity greatly reduces the energy waste, and meanwhile, the laser drying method can replace a hot air drying box method in the aspect of production efficiency.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. The utility model provides a pole piece coating drying device which characterized in that: the method comprises the following steps:
the pole piece conveying mechanism is used for enabling the coated pole piece material roll to continuously pass through the laser drying area;
the isolation cover is used for isolating the laser drying area from the external environment;
laser light source system, the setting is in the cage for output laser is rolled up with dry pole piece material, it includes a plurality of laser module, every laser module includes a plurality of laser unit that the width direction of rolling is rolled up along the pole piece, make every laser module produce the little regional facula that is no less than the width of rolling is rolled up to the pole piece, a plurality of laser module are rolled up length direction along the pole piece and are arranged, make the little regional facula that a plurality of laser module produced roll up length direction along the pole piece and splice into the big regional facula.
2. The pole piece coating drying device of claim 1, wherein: further comprising:
the power supply module is used for independently controlling the output power of each laser module;
the infrared thermometer is used for measuring the temperature of the surface of the pole piece material roll;
and the data acquisition instrument is used for acquiring temperature data acquired by the infrared thermometer, monitoring the stability of the drying process and facilitating the real-time adjustment of the output power of each laser module through the power supply module.
3. The pole piece coating drying device of claim 1, wherein: the isolation hood is provided with an air outlet at the pole piece material feeding side, an air inlet at the pole piece material discharging side, and an air blowing device is arranged at one side of the isolation hood close to the air inlet and used for blowing off the volatile solvent in the coating drying process from a dried area and discharging the solvent through the air outlet.
4. The pole piece coating drying device of claim 1, wherein: the pole piece transmission mechanism comprises:
the unwinding mechanism is used for unwinding the pole piece material roll;
the belt pulley is used for transmitting the pole piece material roll at a constant speed;
and the winding mechanism is used for collecting the dried pole piece material roll.
5. The pole piece coating drying device of claim 1, wherein: the laser module comprises;
cooling the heat sink plate and the package cavity;
the laser units are arranged on one sides of the cooling heat sink plate and the packaging cavity;
the cooling water channel is arranged on the other side of the cooling heat sink plate and the packaging cavity;
and the micro-optical lens is arranged at the bottoms of the cooling heat sink plate and the packaging cavity, is positioned in the light paths of the laser units, and is used for converting the diffused laser light into parallel light or diffused light with a small diffusion angle so as to form small-area light spots in a regular shape.
6. The drying device for pole piece coating of claim 5, wherein: the light spot length of the small area is 10-200 mm, and the width of the small area is 10-200 mm.
7. The drying device for the pole piece coating of claim 6, wherein: the spacing distance between the laser modules is 0-100 mm, and the distance between the light emitting surface of each laser module and the surface of the coating is 100-500 mm.
8. The pole piece coating drying device of claim 1, wherein: the laser wavelength output by the laser light source system is 760 nm-1100 nm.
9. The pole piece coating drying device of claim 8, wherein: the energy density output to the surface of the pole piece material roll by the laser light source system is 5-50W/cm2。
10. A pole piece coating drying method is characterized in that: the method comprises the following steps:
arranging a pole piece transmission mechanism, and continuously passing the coated pole piece material roll through a laser drying area;
arranging an isolation cover to isolate the laser drying area from the external environment;
the laser module is arranged along the length direction of the pole piece material roll, so that the small-area light spots generated by the laser modules are spliced into a large-area light spot along the length direction of the pole piece material roll;
arranging a power supply module for independently controlling the output power of each laser module;
an infrared temperature measurement system is arranged to measure the drying temperature of the pole piece material roll in real time, so that the output power of each laser module can be adjusted in real time through the power supply module;
an air outlet is arranged on the pole piece material roll feeding side of the isolation cover, an air inlet is arranged on the pole piece material roll discharging side of the isolation cover, and an air blowing device is arranged on one side, close to the air inlet, in the isolation cover, and is used for blowing the volatile solvent in the coating drying process away from a dried area and discharging the solvent through the air outlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110309126.7A CN113210230A (en) | 2021-03-23 | 2021-03-23 | Pole piece coating drying device and drying method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110309126.7A CN113210230A (en) | 2021-03-23 | 2021-03-23 | Pole piece coating drying device and drying method |
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| CN202110309126.7A Pending CN113210230A (en) | 2021-03-23 | 2021-03-23 | Pole piece coating drying device and drying method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115451681A (en) * | 2022-09-14 | 2022-12-09 | 苏州德龙激光股份有限公司 | Laser dodging baking device and method for battery pole piece |
| CN115722424A (en) * | 2021-08-31 | 2023-03-03 | 宁德时代新能源科技股份有限公司 | Heating device and heating method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005342658A (en) * | 2004-06-04 | 2005-12-15 | Fuji Photo Film Co Ltd | Laser drying method and apparatus therefor |
-
2021
- 2021-03-23 CN CN202110309126.7A patent/CN113210230A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005342658A (en) * | 2004-06-04 | 2005-12-15 | Fuji Photo Film Co Ltd | Laser drying method and apparatus therefor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115722424A (en) * | 2021-08-31 | 2023-03-03 | 宁德时代新能源科技股份有限公司 | Heating device and heating method |
| CN115722424B (en) * | 2021-08-31 | 2024-03-19 | 宁德时代新能源科技股份有限公司 | Heating device and heating method |
| CN115451681A (en) * | 2022-09-14 | 2022-12-09 | 苏州德龙激光股份有限公司 | Laser dodging baking device and method for battery pole piece |
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Application publication date: 20210806 |