CN113915980A - Pole piece drying system for lithium ion battery coating process and technological method thereof - Google Patents
Pole piece drying system for lithium ion battery coating process and technological method thereof Download PDFInfo
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- CN113915980A CN113915980A CN202111249502.4A CN202111249502A CN113915980A CN 113915980 A CN113915980 A CN 113915980A CN 202111249502 A CN202111249502 A CN 202111249502A CN 113915980 A CN113915980 A CN 113915980A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/001—Drying and oxidising yarns, ribbons or the like
- F26B13/002—Drying coated, e.g. enamelled, varnished, wires
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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
- B05D3/04—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 gases
- B05D3/0406—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 gases the gas being air
- B05D3/0413—Heating with air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Drying Of Solid Materials (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a lithium ion battery coating procedure pole piece drying system and a process method thereof, wherein the pole piece drying system is composed of a hot air station, a hot air output control system, a coating machine drying oven and a coating machine control system, the hot air station is connected with the hot air output control system through a hot air conveying pipeline, the hot air output control system is connected with the coating machine drying oven through a hot air supply pipe at the lower part of the drying oven and a hot air supply pipe at the upper part of the drying oven, and each electric control element in the pole piece drying system is connected with the coating machine control system through a system control circuit. The lithium ion battery coating process pole piece drying system and the process method thereof have the advantages that the energy utilization rate is high, the heat energy is obtained by burning the fuel, compared with the direct resistance heating, the energy utilization rate is high, the energy consumption is low, the cost is low, the same heat is obtained, the cost is 30% -55% lower than that of electric heating, the system is more environment-friendly, and the discharge of the fuel gas burning is far lower than that of the fuel coal for producing the same electric energy on the whole.
Description
Technical Field
The invention relates to the field of lithium ion cell production, in particular to a drying system for a pole piece in a coating process of a lithium ion battery and a process method thereof.
Background
In the production and preparation process of the lithium ion battery, in the front-section coating process, the pole piece needs to be dried after the coating of a coating machine head is finished, at present, the mainstream drying equipment is a tunnel-type long drying oven which is formed by connecting a plurality of single drying ovens in series, each drying oven can be independently set with temperature according to the drying requirement, the heating mode is electric heating, an air blower is arranged outside each drying oven to blow air into the drying oven, cold air is heated into hot air under the action of an electric heating rod, and a solvent in pole piece coating slurry is evaporated and taken away under the flowing of a hot air field, so that the aim of drying the pole piece is fulfilled.
The heat source of coating oven is electrothermal energy, and electric energy passes through resistance conversion to heat energy promptly, and this kind of heating method's advantage has: firstly, the thermal efficiency is high, and the thermal efficiency of electric heating can reach 90 to 95 percent; secondly, the temperature is increased quickly, and a large amount of heat can be generated in a centralized way in a small range by electric heating, so that the set temperature can be reached more quickly; the controllability is strong, and automatic temperature control and remote temperature regulation are easy to realize; environmental protection, no residue and ash are generated during heating, and the heated object and the heating tool can be kept clean; the thermal inertia is small, and the control precision is high; sixthly, the one-time investment is small, and only a resistance heating rod is needed to be arranged in each section of the oven; the safety is good, open fire is not generated by electric heating, and the heating process is safe.
However, the use of electric energy converted into heat for heating and drying has significant drawbacks and disadvantages, including: firstly, the energy consumption is very high, and the power consumption is about 20 ten thousand DEG C for coating and drying each month in a lithium battery coating line with the capacity of 800 ten thousand ampere hours; secondly, the cost is high, the power consumption cost of coating and drying is about 15 ten thousand yuan per month for a lithium battery coating line with the capacity of 800 ten thousand ampere hours calculated according to the average electricity price of each level; the utilization rate of energy is low, electric energy is a high-grade energy, heat energy is a low-grade energy, 70% of domestic generated energy is coal-fired thermal power at present, the generating efficiency of the coal-fired thermal power is only 40%, in this sense, the waste of energy is realized by converting the electric energy into heat energy for drying, the environment protection is very unfavorable for energy conservation and emission reduction on the whole, and the index data of various energy sources are shown in the table 1 for obtaining the heat energy.
TABLE 1 Main Heat energy acquisition mode and conversion cost index
It can be known through the data in the analysis table 1 that chemical energy is converted into heat energy to dry the pole piece through direct combustion and oxidation of fuel, and the method is a good method for saving energy and reducing consumption, and along with the development of the thermal engineering of China, the efficiency of the heat engine is higher and higher, the safety is better and better, the control technology of the heat engine is advanced day by day, the electrification automation and the computer technology become the basic application technology, and of course, the pole piece is dried by obtaining the heat energy through the combustion of the fuel, and several problems must be solved: firstly, the heat carrier cannot contain a substance component which reacts with the slurry; secondly, the efficiency of the thermal system should be improved as much as possible; how to realize the distribution of the temperature field and the wind field in the oven; how to realize the accurate control of the temperature; how to realize environment-friendly production.
Disclosure of Invention
The invention mainly aims to provide a pole piece drying system in a coating process of a lithium ion battery and a process method thereof, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pole piece drying system in a lithium ion battery coating process is composed of a hot air station, a hot air output control system, a coating machine drying oven and a coating machine control system, wherein the hot air station is connected with the hot air output control system through a hot air conveying pipeline, the hot air output control system is connected with the coating machine drying oven through a hot air supply pipe at the lower part of the drying oven and a hot air supply pipe at the upper part of the drying oven, and each electric control element in the pole piece drying system is connected with the coating machine control system through a system control circuit.
Preferably, the hot air station consists of a combustion chamber, a heat accumulation and exchange chamber, the smoke chamber comprises three cavities, the three cavities are of an integral structure which is communicated with each other, the front end of the combustion chamber is provided with a burner, the burner is externally connected with a gas conveying pipeline, a gas electromagnetic valve is arranged on the gas conveying pipeline, the front portion of the combustion chamber is also provided with a combustion-supporting air blast pipe, the combustion-supporting air blast pipe is connected with a combustion-supporting air blower, a heat storage heat exchanger is arranged in the heat storage heat exchange chamber, the upper portion of the heat storage heat exchanger is provided with a hot air outlet, the hot air outlet is connected with a high-temperature draught fan through a hot air outlet pipeline, the lower portion of the heat storage heat exchanger is provided with a cold air inlet, the cold air inlet is connected with the cold air blower through a cold air supply pipe, the tail portion of the smoke chamber is provided with a chimney, the chimney is connected with a smoke exhaust fan through a smoke exhaust pipeline, a waste heat utilization device is arranged inside the smoke chamber, the front end of the waste heat utilization device is connected with the combustion-supporting air blower through a combustion-supporting hot air pipeline, and the rear end of the waste heat utilization device is connected with a combustion-supporting cold air inlet fixed on the outer wall of the smoke chamber.
Preferably, the hot air delivery control system is mainly composed of at least one hot air delivery main pipe and at least one hot air delivery branch pipe extending from each hot air delivery main pipe, each hot air delivery branch pipe is provided with a hot air distribution solenoid valve, the hot air delivery branch pipes are connected with a hot air distribution fan, the hot air distribution fan is connected with a hot air distribution pipeline, the tail end of the hot air distribution pipeline is connected with a hot air supply pipe at the lower part of the oven and a hot air supply pipe at the upper part of the oven, the front part of the hot air distribution pipeline is provided with a cold air distribution pipeline, the cold air distribution pipeline is connected with a cold air distribution fan, and the cold air distribution pipeline is also provided with a cold air distribution solenoid valve.
Preferably, the coating machine drying oven is formed by connecting at least three sections of monomer drying ovens in series to form a drying oven cavity which is through from front to back, the upper part of the side surface of each section of monomer drying oven cavity of the drying oven cavity is connected with a hot air supply pipe at the upper part of the drying oven, the lower part of the side surface of the drying oven cavity is connected with a hot air supply pipe at the lower part of the drying oven, the top of the drying oven cavity is connected with a drying waste gas exhaust pipe, and the drying waste gas exhaust pipe is connected with an oven exhaust fan through an NMP recovery system.
Preferably, the coater control system further comprises, in addition to the conventional control components: all electrical components in the drying system, such as all electromagnetic valves, all fans, combustors and the like, are integrally connected to a coating machine console through a system control circuit.
A technological method of a pole piece drying system in a coating process of a lithium ion battery comprises the following operation steps:
s1: preparing hot air, namely inputting fuel into a combustion chamber of a hot air station for combustion and oxidation to generate hot flue gas rich in heat, enabling the hot flue gas to enter a heat storage and exchange chamber to convert heat energy into natural cold air input from the outside to produce clean hot air, enabling the residual cold flue gas to enter a smoke chamber, further converting the heat into combustion-supporting air, and then exhausting the combustion-supporting air into the atmosphere from a smoke exhauster;
s2: conditioning and conveying hot air, wherein clean hot air produced by a hot air station enters an air conveying pipeline, is regulated by an electromagnetic valve and a hot air distribution fan to reach a set flow proportion, is mixed with external cold air with a set flow, and is input into a cavity of an oven after reaching a set temperature;
s3: establishing a thermal field wind field and drying the pole pieces, dividing an oven into a low-temperature wind field, a high-temperature wind field and a low-temperature wind field from front to back according to the requirement of a pole piece drying temperature curve, correcting the hot air input temperature and flow of each part of the oven, starting coating and drying the pole pieces after the thermal field and the wind field are stabilized, and discharging drying waste gas into the atmosphere under the action of an oven exhaust fan directly or after NMP recovery.
Preferably, in the hot air preparation process, the fuel is one of natural gas, liquefied petroleum gas or coal gas.
Preferably, in the hot air preparation process, the temperature of hot flue gas is controlled to be 300-600 ℃, the outlet temperature of clean hot air is controlled to be 150-250 ℃, and the emission temperature of cold flue gas is less than 55 ℃.
Preferably, in the hot air conditioning and conveying process, the mixing ratio of external cold air to conveying hot air is 0.2-2.5.
Preferably, during the establishment of the thermal field wind field and the drying of the pole pieces, the temperature of the low-temperature wind field is controlled to be 75-100 ℃, the temperature of the high-temperature wind field is controlled to be 100-125 ℃, and the air volume ratio of the high-temperature wind field to the low-temperature wind field is 1.2-2.0.
Compared with the prior art, the invention has the following beneficial effects:
the energy utilization rate is high, the fuel combustion is adopted to obtain heat energy, and compared with direct resistance heating, the energy utilization rate is high.
And (II) the energy consumption is low, the cost is low, the same heat is obtained, and the cost is 30-55% lower than that of electric heating.
And (III) the environment is more environment-friendly, and the emission of gas combustion is far lower than that of coal combustion for producing the same electric energy on the whole.
And (IV) the whole production line is controlled in an integrated manner, and the method is simple and convenient. The multistage fan and the valve are adopted for control, the air flow and temperature control precision is high, the drying temperature field and the air field are uniform and stable, and the drying effect is good.
Drawings
FIG. 1 is a schematic diagram of the drying system (positive electrode drying system) of the present invention;
FIG. 2 is a schematic view of a hot blast station of the present invention;
FIG. 3 is a schematic view of a hot air delivery system of the present invention;
fig. 4 is a schematic view of a negative electrode drying system of the present invention;
FIG. 5 is a schematic view of the drying process of the present invention.
In the figure: 100. a hot air station; 200. a hot air output control system; 300. coating machine drying oven; 400. a coater control system; 101. a gas delivery pipeline; 102. a gas solenoid valve; 103. a burner; 104. a combustion chamber; 105. a hot air outlet pipeline; 106. a high-temperature induced draft fan; 107. a heat storage and exchange chamber; 108. a smoking chamber; 109. a chimney; 110. a smoke chamber exhaust fan; 111. a combustion-supporting blower; 112. a heat storage heat exchanger; 113. a cold air blower; 114. a combustion-supporting warm air pipeline; 115. a cold air blast pipe; 116. a waste heat utilization device; 117. a hot air delivery duct; 118. a hot air outlet; 119. a cold air inlet; 120. a combustion-supporting air blast pipe; 121. a smoke exhaust duct; 122. a combustion-supporting cold air inlet; 201. a hot air distribution main; 202. a hot air distribution solenoid valve; 203. a hot air distribution branch pipe; 204. a hot air distribution fan; 205. a hot air distribution duct; 206. a cold air distribution pipeline; 207. a cold air distribution fan; 208. a cold air distribution electromagnetic valve; 209. a hot air supply pipe at the lower part of the oven; 210. a hot air supply pipe at the upper part of the oven; 301. drying the pole piece; 302. a baking oven chamber; 303. drying the exhaust extraction pipe; 304. An NMP recovery system; 305. an oven exhaust fan; 401. a system control circuit; 402. a coating machine control platform.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The first embodiment is as follows:
as shown in fig. 1-4, a pole piece drying system for lithium ion battery coating process, the pole piece drying system is composed of a hot air station 100, a hot air output control system 200, a coater oven 300 and a coater control system 400, the hot air station 100 is connected with the hot air output control system 200 through a hot air conveying pipeline 117, the hot air output control system 200 is connected with the coater oven 300 through a hot air supply pipe 209 at the lower part of the oven and a hot air supply pipe 210 at the upper part of the oven, each electrical control element in the pole piece drying system is connected with the coater control system 400 through a system control circuit 401, the hot air station 100 is composed of a combustion chamber 104, a heat storage heat exchange chamber 107 and a smoke chamber 108, the three chambers are of an integral structure which are mutually communicated, the front end of the combustion chamber 104 is provided with a burner 103, the burner 103 is externally connected with a gas conveying pipeline 101, the gas conveying pipeline 101 is provided with a gas electromagnetic valve 102, the front part of the combustion chamber 104 is further provided with a combustion-supporting air blast pipe 120, the combustion-supporting air blast pipe 120 is connected with a combustion-supporting blower 111, a heat-accumulating heat exchanger 112 is arranged in the heat-accumulating heat exchange chamber 107, a hot air outlet 118 is arranged at the upper part of the heat-accumulating heat exchanger 112, the hot air outlet 118 is connected with a high-temperature induced draft fan 106 through a hot air outlet pipeline 105, a cold air inlet 119 is arranged at the lower part of the heat-accumulating heat exchanger 112, the cold air inlet 119 is connected with a cold air blower 113 through a cold air blast pipe 115, a chimney 109 is arranged at the tail part of the smoke chamber 108, the chimney 109 is connected with a smoke chamber exhaust fan 110 through a smoke exhaust pipeline 121, a waste heat utilization device 116 is arranged in the smoke chamber 108, the front end of the waste heat utilization device 116 is connected with the combustion-supporting blower 111 through a combustion-supporting hot air pipeline 114, the rear end of the waste heat utilization device 116 is connected with a combustion-supporting cold air inlet 122 fixed on the outer wall of the smoke chamber 108, and the hot air station is used for producing clean hot air; the hot air conveying and controlling system is used for conveying and adjusting parameters such as temperature, flow and the like of clean hot air; the coating machine drying oven is a pole piece drying place of the coating machine and is a place for establishing a drying temperature field and an air field; the coating machine control system is a control center of the whole coating system, has a visual interface platform and a real-time monitoring and adjusting function, the control of the drying system is also realized by integrating the control system into the coating control system, and a combustion chamber is a place for fuel combustion oxidation and chemical energy conversion into heat energy; the heat storage and exchange chamber is used for storing heat energy in the flue gas and transferring the heat energy to a cold air carrier; the smoke chamber is a place where the converted cold smoke is gathered and the waste heat is utilized and discharged, and the whole hot air station actually has three air channels: the combustion chamber → the heat storage and exchange chamber → the smoke chamber → the outside, which is a smoke duct; outside → waste heat utilization → combustion chamber, which is the combustion-supporting air channel; outside → heat storage heat exchanger → hot air outlet pipeline, which is a clean hot air channel; three air ducts are omitted, heat and heat carriers flow in order in the three air ducts, and the heat conversion is completed together, so that the hot air station keeps high heat efficiency, a plurality of fans in the hot air station drive airflow to move forward, the working temperature of a high-temperature induced draft fan needs to be less than 500 ℃, a low-nitrogen burner can be adopted as the burner, the reduction of the content of NOx in flue gas is facilitated, and a desulfurization and denitrification device can be optionally additionally arranged behind a chimney according to the requirement of environmental protection.
The hot air output control system 200 is mainly composed of at least one hot air distribution main pipe 201 and at least one hot air distribution branch pipe 203 extending from each hot air distribution main pipe 201, each hot air distribution branch pipe 203 is provided with a hot air distribution electromagnetic valve 202, the hot air distribution branch pipes 203 are connected with a hot air distribution fan 204, the hot air distribution fan 204 is connected with a hot air distribution pipeline 205, the tail end of the hot air distribution pipeline 205 is connected with a hot air supply pipe 209 at the lower part of the oven and a hot air supply pipe 210 at the upper part of the oven, the front part of the hot air distribution pipeline 205 is provided with a cold air distribution pipeline 206, the cold air distribution pipeline 206 is connected with a cold air distribution fan 207, the cold air distribution pipeline 206 is also provided with a cold air distribution electromagnetic valve 208, the coating machine oven 300 is formed by connecting at least three sections of single ovens in series to form an oven cavity 302 penetrating from front to back, the upper part of the side surface of each section of the single oven cavity 302 is connected with the hot air supply pipe 210 at the upper part of the oven, the lower part of the side surface of the coating machine control system 400 is connected with a hot air supply pipe 209 at the lower part of the drying oven, the top of the drying oven cavity 302 is connected with a drying waste gas exhaust pipe 303, the drying waste gas exhaust pipe 303 is connected with an oven exhaust fan 305 through an NMP recovery system 304, and the coating machine control system 400 further comprises the following components except for a conventional control component: all electrical components in the drying system such as electromagnetic valves, fans, burners and the like are integrally connected to a coater console 402 through a system control circuit 401, the flow of hot air entering each hot air distribution branch pipe is controlled by the frequency of a hot air distribution fan and the opening degree of the hot air distribution electromagnetic valve, at the moment, the temperature of the hot air is higher, so that the hot air distribution fan is a high-temperature type, the working temperature is required to be less than 500 ℃, and the temperature of the hot air is required to be reduced before entering the drying oven according to the requirement, the step is realized by distributing cold air with a certain proportion to the hot air, the frequency of the cold air distribution fan and the opening degree of the cold air distribution electromagnetic valve are adjusted according to a set proportion, so that the mixed air meets the drying requirement, the system supplies clean hot air to the drying oven by adopting a method that the upper layer and the lower layer of the side surface of a single section of the cavity of the drying oven simultaneously supply air, so that the temperature field and the wind field in the drying oven are more uniform and stable, when the pole piece is conveyed in the oven, hot air is just input from the upper surface and the lower surface of the pole piece, which is beneficial to the rapid and stable drying of the pole piece.
Example two:
as shown in fig. 5, a process method of a pole piece drying system in a coating process of a lithium ion battery comprises the following operation steps:
s1: preparing hot air, namely inputting fuel into a combustion chamber of a hot air station for combustion and oxidation to generate hot flue gas rich in heat, enabling the hot flue gas to enter a heat storage and exchange chamber to convert heat energy into natural cold air input from the outside to produce clean hot air, enabling the residual cold flue gas to enter a smoke chamber, further converting the heat into combustion-supporting air, and then exhausting the combustion-supporting air into the atmosphere from an exhaust fan, wherein in the hot air preparation process, the fuel is one of natural gas, liquefied petroleum gas or coal gas, in the hot air preparation process, the temperature of the hot flue gas is controlled to be 300-600 ℃, the outlet temperature of the clean hot air is controlled to be 150-250 ℃, and the emission temperature of the cold flue gas is less than 55 ℃;
s2: hot air tempering and conveying, wherein clean hot air produced by a hot air station enters an air conveying pipeline, is regulated by an electromagnetic valve and a hot air distribution fan to reach a set flow ratio, is mixed with external cold air with a set flow, is conveyed into a cavity of an oven after reaching a set temperature, and the mixing ratio of the external cold air to the conveyed hot air is 0.2-2.5 in the hot air tempering and conveying process;
s3: the method comprises the steps of establishing a thermal field wind field and drying a pole piece, dividing an oven into a low-temperature wind field, a high-temperature wind field and a low-temperature wind field from front to back according to the requirement of a pole piece drying temperature curve, correcting the hot air input temperature and flow of each part of the oven, starting coating and drying the pole piece after the thermal field and the wind field are stabilized, discharging drying waste gas into the atmosphere directly or after NMP recovery under the action of an oven exhaust fan, controlling the temperature of the low-temperature wind field to be 75-100 ℃ and the temperature of the high-temperature wind field to be 100-125 ℃ during establishment of the thermal field wind field and drying of the pole piece, and controlling the air volume ratio of the high-temperature wind field to the low-temperature wind field to be 1.2-2.0.
The lithium battery coating and drying process is divided into three-section drying in terms of temperature field, the drying oven is divided into a low-temperature section, a high-temperature section and a low-temperature section from front to back, when a pole piece is positioned at the first low-temperature section, a solvent in a coating is heated and heated, and the solvent rises from the bottom layer to the surface layer, at the moment, the temperature is not too high, the air volume is not too large, otherwise, the defects of pole piece cracking, coating adhesive floating and the like are easily caused; when the pole piece is in a second section high-temperature section, a large amount of solvent is evaporated, and the temperature section is a main force section for drying the pole piece and needs higher temperature and large air volume; when the pole piece is positioned in a third low-temperature section, drying is basically completed, at the moment, the drying of the local position of the coating surface and the overall cooling of the pole piece are mainly carried out, a lower temperature and a smaller air volume are needed, for positive pole coating, a dried solvent is mainly NMP (N-methyl pyrrolidone), and the temperature of a high-temperature section is controlled to be 110-125 ℃; for the coating of the negative electrode, the dried solvent is mainly water, and the temperature of the high-temperature section is controlled to be 100-110 ℃.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a lithium ion battery coating process pole piece drying system which characterized in that: the pole piece drying system is composed of a hot air station (100), a hot air output control system (200), a coating machine drying oven (300) and a coating machine control system (400), wherein the hot air station (100) is connected with the hot air output control system (200) through a hot air conveying pipeline (117), the hot air output control system (200) is connected with the coating machine drying oven (300) through a hot air supply pipe (209) at the lower part of the drying oven and a hot air supply pipe (210) at the upper part of the drying oven, and each electric control element in the pole piece drying system is connected with the coating machine control system (400) through a system control circuit (401).
2. The lithium ion battery coating process pole piece drying system of claim 1, wherein: the hot air station (100) is composed of a combustion chamber (104), a heat storage heat exchange chamber (107) and a smoke chamber (108), the three chambers are of an integral structure which is communicated with each other, a burner (103) is arranged at the front end of the combustion chamber (104), the burner (103) is externally connected with a fuel gas conveying pipeline (101), a fuel gas electromagnetic valve (102) is arranged on the fuel gas conveying pipeline (101), a combustion-supporting air blast pipe (120) is further arranged at the front part of the combustion chamber (104), the combustion-supporting air blast pipe (120) is connected with a combustion-supporting blower (111), a heat storage heat exchanger (112) is arranged in the heat storage heat exchange chamber (107), a hot air outlet (118) is arranged at the upper part of the heat storage heat exchanger (112), the hot air outlet (118) is connected with a high-temperature induced draft fan (106) through an air outlet pipeline (105), a cold air inlet (119) is arranged at the lower part of the heat storage heat exchanger (112), and the cold air inlet (119) is connected with a cold air blower (113) through a cold air blast pipe (115), the tail of the smoke chamber (108) is provided with a chimney (109), the chimney (109) is connected with a smoke chamber exhaust fan (110) through a smoke exhaust pipeline (121), a waste heat utilization device (116) is arranged inside the smoke chamber (108), the front end of the waste heat utilization device (116) is connected with a combustion-supporting air blower (111) through a combustion-supporting warm air pipeline (114), and the rear end of the waste heat utilization device (116) is connected with a combustion-supporting cold air inlet (122) fixed on the outer wall of the smoke chamber (108).
3. The lithium ion battery coating process pole piece drying system of claim 2, wherein: the hot air output control system (200) is mainly composed of at least one hot air distribution main pipe (201) and at least one hot air distribution branch pipe (203) extending from each hot air distribution main pipe (201), each hot air distribution branch pipe (203) is provided with a hot air distribution electromagnetic valve (202), the hot air distribution branch pipes (203) are connected with a hot air distribution fan (204), the hot air distribution fan (204) is connected with a hot air distribution pipeline (205), the tail end of the hot air distribution pipeline (205) is connected with a hot air supply pipe (209) at the lower part of the oven and a hot air supply pipe (210) at the upper part of the oven, the front part of the hot air distribution pipeline (205) is provided with a cold air distribution pipeline (206), the cold air distribution pipeline (206) is connected with a cold air distribution fan (207), and the cold air distribution electromagnetic valve (208) is further arranged on the cold air distribution pipeline (206).
4. The lithium ion battery coating process pole piece drying system of claim 3, wherein: the coating machine drying oven (300) is formed by connecting at least three sections of monomer drying ovens in series to form a drying oven cavity (302) which is through from front to back, the upper side part of each section of monomer drying oven cavity of the drying oven cavity (302) is connected with a hot air supply pipe (210) at the upper part of the drying oven, the lower side part of the monomer drying oven cavity is connected with a hot air supply pipe (209) at the lower part of the drying oven, the top part of the drying oven cavity (302) is connected with a drying waste gas exhaust pipe (303), and the drying waste gas exhaust pipe (303) is connected with a drying oven exhaust fan (305) through an NMP recovery system (304).
5. The lithium ion battery coating process pole piece drying system of claim 4, wherein: the coater control system (400) includes, in addition to conventional control components: all electrical components in the drying system, such as electromagnetic valves, fans, burners and the like, are integrally connected to a coating machine control console (402) through a system control circuit (401).
6. The process method of the pole piece drying system in the coating process of the lithium ion battery according to any one of claims 1 to 5, which is characterized in that: the method comprises the following operation steps:
s1: preparing hot air, namely inputting fuel into a combustion chamber of a hot air station for combustion and oxidation to generate hot flue gas rich in heat, enabling the hot flue gas to enter a heat storage and exchange chamber to convert heat energy into natural cold air input from the outside to produce clean hot air, enabling the residual cold flue gas to enter a smoke chamber, further converting the heat into combustion-supporting air, and then exhausting the combustion-supporting air into the atmosphere from a smoke exhauster;
s2: conditioning and conveying hot air, wherein clean hot air produced by a hot air station enters an air conveying pipeline, is regulated by an electromagnetic valve and a hot air distribution fan to reach a set flow proportion, is mixed with external cold air with a set flow, and is input into a cavity of an oven after reaching a set temperature;
s3: establishing a thermal field wind field and drying the pole pieces, dividing an oven into a low-temperature wind field, a high-temperature wind field and a low-temperature wind field from front to back according to the requirement of a pole piece drying temperature curve, correcting the hot air input temperature and flow of each part of the oven, starting coating and drying the pole pieces after the thermal field and the wind field are stabilized, and discharging drying waste gas into the atmosphere under the action of an oven exhaust fan directly or after NMP recovery.
7. The process method of the pole piece drying system in the coating process of the lithium ion battery according to claim 6, which is characterized in that: in the preparation process of the hot air, the fuel is one of natural gas, liquefied petroleum gas or coal gas.
8. The process method of the pole piece drying system in the coating process of the lithium ion battery according to claim 7, which is characterized in that: in the hot air preparation process, the temperature of hot flue gas is controlled to be 300-600 ℃, the outlet temperature of clean hot air is controlled to be 150-250 ℃, and the emission temperature of cold flue gas is less than 55 ℃.
9. The process method of the pole piece drying system in the coating process of the lithium ion battery according to claim 8, characterized in that: in the hot air conditioning and conveying process, the mixing ratio of external cold air to conveying hot air is 0.2-2.5.
10. The process method of the pole piece drying system in the coating process of the lithium ion battery according to claim 9, which is characterized in that: during the establishment of the thermal field wind field and the drying of the pole pieces, the temperature of the low-temperature wind field is controlled to be 75-100 ℃, the temperature of the high-temperature wind field is controlled to be 100-125 ℃, and the air volume ratio of the high-temperature wind field to the low-temperature wind field is 1.2-2.0.
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Application publication date: 20220111 |