Coating pole piece drying equipment

Abstract

The invention relates to the technical field of lithium battery coating, in particular to coated pole piece drying equipment which comprises a box body, a heat conduction roller used for abutting against a pole piece is rotationally arranged in the box body, a feeding port and a discharging port are formed in the box body, and the pole piece is fed from the feeding port, wound around the heat conduction roller and then discharged from the discharging port. Heating systems are arranged in the heat conduction rollers, the heating systems are used for heating the heat conduction rollers and adjusting the temperature of the heat conduction rollers, and a plurality of air pipes are arranged in the box body. The lithium battery coating device has the effects of improving the coating effect, improving the production quality of the lithium battery and improving the cleanness and safety of the working environment.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery coating, and in particular to a coating pole piece drying device. Background Art

[0002] In the lithium battery production process, the control of the moisture content of the battery electrode is crucial, which directly determines the various performance indicators of the lithium battery. Therefore, the moisture content of the battery electrode needs to be controlled within a certain range. In the prior art, the battery electrode is usually dried and dehydrated by a contact drying method such as roller drying, or a non-contact drying method such as hot air drying in an oven. Among them, the hot air drying method heats from the outer layer to the inner layer of the coating material, and the heating efficiency is low and the heating is uneven; the roller drying method heats the coating material from the inside to the outside by contacting the electrode, and the heating efficiency is high, but the problem of uneven heating in hot air drying is the same, resulting in electrode defects such as craters and whitening. In addition, the existing baking equipment still uses a split layout recovery equipment to recover the solvent generated after the coating material is baked, and lacks effective integration, which needs to be solved urgently. Summary of the invention

[0003] In view of the deficiencies in the above-mentioned prior art, the present application provides a coating electrode drying device, which uses a heat-conducting roller with a heating system to perform contact heating and drying on the electrode, and a duct with an electric heating wire to perform non-contact heat conduction on the electrode, and heats the outer layer and the inner layer of the coating material at the same time, and adjusts the heating temperature of the two methods so that the drying progress of the inner and outer layers of the coating material is close to synchronization, thereby greatly improving the baking efficiency and heating uniformity of the coating material, and improving the flexibility of the baking equipment, so as to solve the problems of low heating efficiency and uneven heating, and electrode defects such as craters and whitening; And by integrating the capture system into the interior of the box, the solvent generated by the heating of the coating material can be directly taken away, ensuring the cleanliness and safety of the working environment and meeting the requirements of energy conservation and emission reduction.

[0004] The above invention objectives of the present application are achieved through the following technical solutions: A box body, inside which a heat-conducting roller for contacting the electrode piece is rotatably arranged, the box body is provided with a loading port and a unloading port, the electrode piece is fed from the loading port and wound around the heat-conducting roller, and then discharged from the unloading port, a heating system is arranged inside the heat-conducting roller, the heating system is used to heat the heat-conducting roller and adjust the temperature of the heat-conducting roller, and a plurality of air ducts are arranged in the box body.

[0005] Preferably, a plurality of the air ducts are arranged radially along the heat-conducting roller, the pipe openings of the air ducts are all facing the roller surface of the heat-conducting roller, and the air ducts are connected to a blower and are provided with a regulating valve.

[0006] Preferably, a heating wire for generating heat is provided inside the air duct.

[0007] Preferably, a plurality of the air ducts are arranged along the circumference direction of the heat-conducting roller or along the axial direction of the heat-conducting roller.

[0008] Preferably, the plurality of air ducts are obliquely arranged on the heat-conducting roller to form an angle with the heat-conducting roller.

[0009] Preferably, the shape of the opening of the air duct is circular, rectangular or flat slit.

[0010] Preferably, a mounting frame is provided inside the box body, and a plurality of the air ducts are hingedly provided on the mounting frame.

[0011] Preferably, an airflow detection sensor is provided in the air duct, and the airflow detection sensor is used to detect the temperature, flow rate and flow velocity of the gas.

[0012] Preferably, the heat-conducting roller is provided with a temperature sensor, a cylindricity detection device and a smoothness detection device.

[0013] Preferably, a plurality of heat-conducting rollers are provided, and the pole piece is fed from the feeding port and sequentially wound around each of the heat-conducting rollers before being discharged from the feeding port.

[0014] Preferably, the heating system comprises a plurality of electric heating rods for generating heat, wherein the plurality of electric heating rods are arranged on the inner side wall of the heat-conducting roller along the circumference direction of the heat-conducting roller, and the inner side wall of the heat-conducting roller is provided with a plurality of temperature probes along its own circumference direction.

[0015] Preferably, a plurality of the electric heating rods are spirally distributed on the inner wall of the heat-conducting roller.

[0016] Preferably, the electric heating rod is electrically connected to an external electric box via a wire, and the heat-conducting roller is coaxially provided with an electric slip ring, and the electric slip ring is electrically connected between the wire and the external electric box.

[0017] Preferably, the heating system includes a plurality of pipelines, a liquid storage tank, a pump body and a circulating liquid pipe group, a plurality of the pipelines are spirally distributed and arranged on the inner wall of the heat-conducting roller, the liquid storage tank is filled with a heated fluid and a heating element for heating the heated fluid, the circulating liquid pipe group is connected between the liquid storage tank and any of the pipelines, and the pump body is connected between the liquid storage tank and the circulating liquid pipe group.

[0018] Preferably, the heating system includes a pipeline, a liquid storage tank, a pump body and a circulating liquid pipe group. The heat-conducting roller is provided with a plurality of liquid conduction holes, and the plurality of liquid conduction holes are arranged along the circumference of the heat-conducting roller. Adjacent liquid conduction holes are connected through the pipeline. The liquid storage tank is filled with a heated fluid and a heating element for heating the heated fluid. The circulating liquid pipe group is connected between the liquid storage tank and any of the pipelines, and the pump body is connected between the liquid storage tank and the circulating liquid pipe group.

[0019] Preferably, the heating system includes a steam supply system, a heat exchange device, a plurality of pipelines and a circulating liquid pipe group, the plurality of pipelines are arranged on the inner wall of the heat-conducting roller and are filled with a heat-receiving fluid, the circulating liquid pipe group is connected and arranged between the heat exchange device and any of the pipelines, the steam supply system is used to transport steam to the heat exchange device, and the heat exchange device is used to collect steam energy and heat the circulating liquid pipe group.

[0020] Preferably, the heat exchange device comprises a heated sleeve and a plurality of heat exchange microtubes, the heat exchange microtubes are connected to the steam supply system, the plurality of heat exchange microtubes are arranged inside the heated sleeve, and the heated sleeve is connected to the circulating liquid pipe group.

[0021] Preferably, the heat-conducting roller is coaxially provided with a liquid slip ring, and the liquid slip ring is connected between the circulating liquid pipe group and the pipeline.

[0022] Preferably, the heat-conducting roller is equipped with a synchronous motor, and the output shaft of the synchronous motor is coaxially fixedly connected to the heat-conducting roller.

[0023] Preferably, the coated electrode drying equipment also includes a capture system, which is arranged in the box and is used to collect the solvent generated in the box when the coating material is heated. The capture system includes an air circulation mechanism and a condensation mechanism. The air circulation mechanism is connected to the box and is used to transport the gaseous solvent generated in the box when the coating material is heated to the condensation mechanism. The condensation mechanism is arranged in the box and is used to condense and collect the gaseous solvent.

[0024] Preferably, the air circulation mechanism includes a ventilation box and an exhaust fan, the blower and the exhaust fan are both connected to the box body, the ventilation box is connected and arranged between the blower and the box body, and the exhaust fan is arranged at the condensing mechanism and is used to extract the remaining gas after passing through the condensing mechanism.

[0025] Preferably, the condensation mechanism includes a condensation plate, a circulating condensation tube and a chiller, the condensation plate is arranged inside the box body and is surrounded by the box body to form a condensation area, the circulating condensation tube is arranged inside the condensation area and is used to cool the condensation plate, the chiller is connected to the circulating condensation tube, the condensation plate is provided with a plurality of through holes, a collection groove is provided inside the box body corresponding to the bottom end of the condensation plate, the collection groove is connected to the condensation area through the through holes and is at a height lower than the condensation area.

[0026] Compared with the prior art, the present invention has the following beneficial effects: After the electrode is coated, it is wound around the heat-conducting roller inside the box and heated by the heating system, so that the heat-conducting roller can perform contact heating and drying on the electrode from the inside to the outside, and the electric heating wires inside the air ducts heat the air sent into the air ducts by the blower to form high-temperature hot air, which is output to the roller surface of the heat-conducting roller through the air ducts, thereby performing hot air drying on the coated surface of the electrode, that is, heat is transferred from the outer layer to the inner layer of the coated material by non-contact heat conduction, and the contact heat conduction of the heat-conducting roller is used to achieve simultaneous heating of the outer and inner layers of the coated material, and the temperature of the heat-conducting roller is adjusted by the heating system, and the air volume and air temperature inside the air duct are independently adjusted by the regulating valve, thereby controlling the intensity and temperature distribution of the hot air blown to the surface of the heat-conducting roller, and being able to adjust the heating temperature of the two methods so that the drying progress of the inner and outer layers of the coated material is close to synchronization, thereby greatly improving the baking efficiency and heating uniformity of the coated material and improving the flexibility of the baking equipment.

[0027] By setting up the mounting frame, a rotational mounting position is provided for the air duct, and by hingedly setting the air duct on the mounting frame, the air duct can freely adjust its angle to adjust the blowing direction of the hot air. After the electrode is coated, it is wound around each heat-conducting roller in turn through the inside of the box. Each heat-conducting roller is heated by its internal heating system, so that each heat-conducting roller can contact-heat and dry the electrode from the inside out, and through the temperature control of each heating system, the temperature of each heat-conducting roller can be freely adjusted, and the temperature of several heat-conducting rollers can be increased along the direction of electrode conveying, so that the coated material can complete multi-stage heating in sequence to avoid defects of the electrode caused by too rapid heating, thereby improving the control accuracy of the moisture content of the electrode, and then improving the coating effect and the production quality of lithium batteries.

[0028] When electric heating is adopted, the heat-conducting roller is heated by energizing the electric heating rod, so that the heat is directly transferred to the outer surface of the heat-conducting roller to achieve heat conduction to the electrode. At the same time, several temperature probes are arranged along the circumference of the heat-conducting roller to monitor the temperature of various parts of the heat-conducting roller.

[0029] The use of a plurality of electric heating rods distributed in a spiral shape can increase the contact area between the electric heating rods and the heat-conducting roller, thereby improving the heat-conducting efficiency.

[0030] By setting up an electric slip ring, it is possible to avoid the problem of the wire being twisted, entangled or broken during the rotation of the heat-conducting roller, which is suitable for working conditions of power wire transmission.

[0031] When liquid bath heating is adopted, a complete liquid heating circulation system is formed among the liquid storage tank, pipeline, pump body and circulating liquid pipe group. After the heated fluid is heated inside the liquid storage tank, it is transported to the pipeline through the circulating liquid pipe group under the action of the pump body. The spirally distributed pipeline transfers the heat to the outer surface of the heat-conducting roller through contact heat conduction to achieve heat conduction to the electrode.

[0032] When liquid bath heating is adopted, a complete liquid heating circulation system is formed between the liquid storage tank, pipeline, pump body and circulating liquid pipe group. After the heated fluid is heated inside the liquid storage tank, it is transported to the pipeline through the circulating liquid pipe group under the action of the pump body, and then transported to each liquid guide hole to transfer the heat to the outer surface of the heat-conducting roller, so as to realize the heat conduction effect on the electrode.

[0033] When steam heating is adopted, the steam supply system transports steam to the heat exchange device. The heat exchange device collects the steam so that the steam directly acts on the heated fluid in the heat exchange device. Then, the water is circulated to the pipe inside the heat transfer roller through the circulating liquid pipe group to increase the temperature of the pipe, thereby completing the heating of the heat transfer roller by the pipe.

[0034] By setting up a liquid slip ring, it is possible to avoid the problem of twisting, entanglement or breakage of the circulating liquid pipe group during the rotation of the heat transfer roller, which is suitable for pipeline transportation conditions.

[0035] The synchronous motor can control the rotation speed of the heat transfer roller to synchronize the conveying speed of the pole piece, thereby reducing the sliding friction of the pole piece during the conveying process, reducing the possibility of damage to the pole piece, and thus improving the production quality of lithium batteries.

[0036] Under the action of the capture system, the solvent generated by the heating of the coating material can be taken away to ensure the cleanliness and safety of the working environment and meet the requirements of energy conservation and emission reduction. The gaseous solvent generated by the coating material is transported to the condensation mechanism under the action of the wind circulation mechanism to prevent the gaseous solvent from condensing inside the box and affecting the stability and cleanliness of the working environment. The condensation mechanism can condense the gaseous solvent and complete liquid collection, thereby meeting the requirements of green production.

[0037] The blower is combined with the ventilation box to complete the air supply, and the exhaust fan is used to complete the air extraction, so as to form a wind circulation to maintain the circulation of air inside the box, and drive the gaseous solvent inside the box to be transported to the condensation mechanism for condensation treatment. Then the remaining gas is extracted by the exhaust fan installed at the condensation mechanism, ensuring the condensation treatment of the gaseous solvent and the effective discharge of the remaining gas.

[0038] The chiller cools the liquid in the circulating condenser tube so that the cooling liquid circulates in the condensation area, continuously refrigerating the condensation plate to form a low-temperature surface, so that when the gaseous solvent passes through the condensation plate, part of the gaseous solvent can condense on the condensation plate and slide into the collection tank at the bottom to complete the first collection. The remaining gaseous solvent enters the condensation area through several through holes and condenses on the circulating condenser tube and slides to the bottom of the condensation area. Since the height of the collection tank is lower than the condensation area and is connected to the condensation area through the through holes, the condensed liquid in the condensation area can flow into the collection tank through the through holes to complete the second collection, thereby realizing the condensation and collection of the gaseous solvent and achieving the effect of keeping the inside of the box dry.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 It is a schematic diagram of the structure of the coating electrode drying equipment after part of the box body is cut away in one embodiment of the present invention.

[0042] Figure 2 is a schematic structural diagram of a heat-conducting roller in one embodiment of the present invention; Figure 3 is a schematic cross-sectional structure diagram of a heat-conducting roller in one embodiment of the present invention; Figure 4 It is a schematic structural diagram of a coating electrode drying device after a part of the box body is cut away in another embodiment of the present invention; Figure 5 yes Figure 4 A partial enlarged schematic diagram of part A; Figure 6 is a schematic cross-sectional structure diagram of a heat-conducting roller in another embodiment of the present invention; Figure 7 is a schematic structural diagram of a heat-conducting roller in another embodiment of the present invention; Figure 8 It is a structural schematic diagram of a coating electrode drying device in another embodiment of the present invention after a part of the box body is cut away; Fig. 9 It is a structural diagram of a connection system between a heating system and a heat-conducting roller in another embodiment of the present invention.

[0043] Fig.10 It is another structural schematic diagram of the coating electrode drying equipment after part of the box body is cut away in one embodiment of the present invention; Fig.11 yes Fig.10 A partial enlarged schematic diagram of part B.

[0044] In the figure: 1. box body; 2. heat transfer roller; 3. loading port; 4. unloading port; 5. heating system; 51. electric heating rod; 52. wire; 53. electric box; 54. electric slip ring; 55. pipeline; 56. liquid storage tank; 57. pump body; 58. circulating liquid pipe group; 59. liquid guide hole; 510. liquid slip ring; 511. steam supply system; 512. heat exchange device; 5121. heating sleeve; 5122. heat exchange micro tube; 6. capture system; 61. air circulation mechanism; 611. blower; 612. ventilation box; 613. exhaust fan; 62. condensation mechanism; 621. condensation plate; 622. circulating condensation pipe; 623. chiller; 624. through hole; 7. collecting tank; 8. air duct; 9. regulating valve; 10. synchronous motor; 11. water valve; 12. mounting frame. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure.

[0047] See also Figures 1 to 11In an embodiment of the present invention, a coated electrode drying device includes: a box body 1 and a control system. A heat-conducting roller 2 for contacting the electrode is rotatably arranged inside the box body 1. The box body 1 is provided with a loading port 3 and a unloading port 4. The electrode is fed from the loading port 3 and wound around the heat-conducting roller 2, and then discharged from the unloading port 4. A heating system 5 is arranged inside the heat-conducting roller 2. The heating system 5 is used to heat the heat-conducting roller 2 and adjust the temperature of the heat-conducting roller 2. A plurality of air ducts 8 are arranged inside the box body 1. The control system is electrically connected to the heating system 5.

[0048] Specifically, a plurality of air ducts 8 are arranged radially along the heat transfer roller 2, and the pipe ends of the air ducts 8 are all facing the roller surface of the heat transfer roller 2. The air ducts 8 are connected to a blower 611 and are provided with a regulating valve 9. The blower 611 supplies air to the inside of the box 1 through the air ducts 8 to allow the gaseous solvent generated after the coating material is heated to flow, thereby avoiding contamination of the electrode.

[0049] Furthermore, electric heating wires for generating heat are arranged inside the air duct 8, so that the electric heating wires inside the air duct 8 heat the air sent into the air duct 8 by the blower 611 by generating heat, thereby forming high-temperature hot air, which is output to the roller surface of the heat-conducting roller 2 through the air duct 8, thereby performing hot air drying on the coated surface of the electrode.

[0050] Specifically, during operation, after the electrode is coated, it is wound around the heat-conducting roller 2 inside the box 1 and heated by the heating system 5, so that the heat-conducting roller 2 can contact-heat and dry the electrode from the inside to the outside, and the electric heating wires inside the air ducts 8 heat the air sent into the air ducts 8 by the blower 611 to form high-temperature hot air, which is output to the roller surface of the heat-conducting roller 2 through the air duct 8, thereby drying the coated surface of the electrode with hot air, that is, heat is transferred from the coated surface to the heat-conducting roller 2 by non-contact heat conduction. The outer layer of the cloth material is transferred to the inner layer, and the contact heat conduction of the heat-conducting roller 2 is used to heat the outer and inner layers of the coated material at the same time. The temperature of the heat-conducting roller 2 is adjusted by the heating system 5, and the air volume and air temperature inside the air duct 8 are independently adjusted by the regulating valve 9, thereby controlling the intensity and temperature distribution of the hot air blown to the surface of the heat-conducting roller 2. The heating temperature of the two methods can be adjusted so that the drying progress of the inner and outer layers of the coated material is close to synchronization, thereby greatly improving the baking efficiency and heating uniformity of the coated material and improving the flexibility of the baking equipment.

[0051] In one embodiment, a plurality of air ducts 8 are arranged along the circumference direction of the heat-conducting roller 2 or along the axial direction of the heat-conducting roller 2 .

[0052] In one embodiment, a plurality of air ducts 8 are disposed obliquely on the heat-conducting roller 2 to form an angle with the heat-conducting roller 2 so as to more easily carry away the solvent and allow it to enter a circulating flow.

[0053] In one embodiment, the shape of the opening of the air duct 8 is circular, rectangular, or flat slit-shaped, so that the staff can adjust it according to the actual working conditions.

[0054] In one embodiment, an air flow detection sensor (not shown in the figure) is provided in the air duct 8, and the air flow detection sensor is used to detect the temperature, flow rate and flow velocity of the gas. The control system is electrically connected to the regulating valve 9 and the gas detection sensor to facilitate the staff to monitor the hot air drying operation.

[0055] It should be noted that the airflow detection sensor can adopt conventional instruments and equipment on the market, and its working principle and specific structure are common knowledge to those skilled in the art and will not be elaborated here.

[0056] Furthermore, a mounting frame 12 is provided inside the box body 1, and a plurality of air ducts 8 are hingedly provided on the mounting frame 12. By providing the mounting frame 12, a position for rotating installation is provided for the air ducts 8. At the same time, by hingedly providing the air ducts 8 on the mounting frame 12, the air ducts 8 can freely adjust their angles to adjust the blowing direction of the hot air.

[0057] Furthermore, the heat-conducting roller 2 is provided with a temperature sensor (not shown in the figure), a cylindricity detection device (not shown in the figure) and a smoothness detection device (not shown in the figure), and the control system is electrically connected to the temperature sensor, the cylindricity detection device and the smoothness detection device, so that the staff can monitor the working status of the heat-conducting roller 2.

[0058] It should be noted that the temperature sensor, cylindricity detection device and smoothness detection device can all adopt conventional instruments and equipment on the market, and their working principles and specific structures are common knowledge to those skilled in the art and will not be elaborated here.

[0059] Furthermore, a plurality of heat-conducting rollers 2 are provided, and the pole pieces are fed from the feeding port 3 and are sequentially wound around each heat-conducting roller 2 before being discharged from the feeding port 4 .

[0060] Specifically, during operation, after the electrode is coated, it is sequentially wound around each heat-conducting roller 2 through the inside of the box body 1, and each heat-conducting roller 2 is heated by the heating system 5 inside it, so that each heat-conducting roller 2 can perform contact heating and drying on the electrode from the inside to the outside, and through the temperature control of each heating system 5, the temperature of each heat-conducting roller 2 can be freely adjusted, and the temperature of several heat-conducting rollers 2 can be gradually increased along the direction of electrode conveying, so that the coated material can complete multi-stage heating in sequence, so as to avoid defects of the electrode caused by too fast heating, thereby improving the control accuracy of the moisture content of the electrode, and then improving the coating effect and the production quality of lithium batteries.

[0061] It should be noted that in this embodiment, there is a height difference between the feeding port 3 and the discharging port 4 in the vertical direction of the box body 1. After the pole piece is fed from the feeding port 3 and sequentially wound around each heat conduction roller 2, the conveying route of discharging from the discharging port 4 forms a "C" shape. By setting the "C" shaped pole piece conveying route and matching the feeding port 3 and the discharging port 4 with a height difference in the vertical direction, the horizontal and vertical spaces inside the box body 1 can be utilized to the greatest extent, enabling the pole piece to be sequentially wound around multiple heat conduction rollers 2 with increasing temperatures to achieve gradual and uniform drying, improving the drying effect of the pole piece, and at the same time optimizing the layout of the baking line to reduce the floor area of the baking equipment.

[0062] In addition, in one embodiment, the heating system 5 includes a plurality of electric heating rods 51 for generating heat. The plurality of electric heating rods 51 are arranged along the circumferential direction of the heat conduction roller 2 on the inner side wall of the heat conduction roller 2. A plurality of temperature probes are arranged along the circumferential direction of the inner side wall of the heat conduction roller 2, so that the heat conduction roller 2 can adopt an electric heating method. The electric heating rods 51 are energized to generate heat, and the heat is directly conducted to the outer surface of the heat conduction roller 2 through heat conduction to achieve the heat conduction effect on the pole piece. At the same time, by arranging a plurality of temperature probes along the circumferential direction of the heat conduction roller 2, it is convenient to monitor the temperatures at various places of the heat conduction roller 2.

[0063] Furthermore, the plurality of electric heating rods 51 are spirally distributed on the inner side wall of the heat conduction roller 2, which can increase the contact area between the electric heating rods 51 and the heat conduction roller 2, thereby improving the heat conduction efficiency.

[0064] Furthermore, the electric heating rods 51 are electrically connected to an external electric box 53 through wires 52. A slip ring 54 is coaxially arranged on the heat conduction roller 2, and the slip ring 54 is electrically connected between the wire 52 and the external electric box 53. By setting the slip ring 54, the problems of twisting, winding or breaking of the wire 52 during the rotation of the heat conduction roller 2 can be avoided, which is suitable for the working conditions of power wire 52 transmission.

[0065] In another embodiment, the heating system 5 includes a plurality of pipelines 55, a liquid storage tank 56, a pump body 57 and a circulating liquid pipe group 58. The plurality of pipelines 55 are spirally distributed on the inner side wall of the heat conduction roller 2. The liquid storage tank 56 contains a heated fluid and is provided with a heating element for heating the heated fluid. The circulating liquid pipe group 58 is communicatively arranged between the liquid storage tank 56 and any one of the pipelines 55. The pump body 57 is communicatively arranged between the liquid storage tank 56 and the circulating liquid pipe group 58. A complete liquid heating circulation system is formed among the liquid storage tank 56, the pipeline 55, the pump body 57 and the circulating liquid pipe group 58. After the heated fluid is heated inside the liquid storage tank 56, it is conveyed to the pipeline 55 through the circulating liquid pipe group 58 under the action of the pump body 57. The spirally distributed pipeline 55 conducts heat to the outer surface of the heat conduction roller 2 through contact heat conduction to achieve the heat conduction effect on the pole piece.

[0066] In another embodiment, the heating system 5 includes a pipeline 55, a liquid storage tank 56, a pump body 57 and a circulating liquid pipe group 58. The heat-conducting roller 2 is provided with a plurality of liquid guide holes 59, which are arranged along the circumference of the heat-conducting roller 2. Adjacent liquid guide holes 59 are connected through the pipeline 55. The liquid storage tank 56 is filled with a heated fluid and a heating element for heating the heated fluid. The circulating liquid pipe group 58 is connected between the liquid storage tank 56 and any one of the pipelines 55. The pump body 57 is connected between the liquid storage tank 56 and the circulating liquid pipe group 58. A complete liquid heating circulation system is formed among the liquid storage tank 56, the pipeline 55, the pump body 57 and the circulating liquid pipe group 58. After the heated fluid is heated inside the liquid storage tank 56, it is transported to the pipeline 55 through the circulating liquid pipe group 58 under the action of the pump body 57, and then transported to each liquid guide hole 59 to transfer the heat to the outer surface of the heat-conducting roller 2 to achieve heat conduction to the electrode.

[0067] In another embodiment, the heating system 5 includes a steam supply system 511, a heat exchange device 512, a plurality of pipelines 55 and a circulating liquid pipe group 58. The plurality of pipelines 55 are arranged on the inner wall of the heat-conducting roller 2 and are all filled with a heat-receiving fluid. The circulating liquid pipe group 58 is connected and arranged between the heat-conducting device 512 and any pipeline 55. The steam supply system 511 is used to transport steam to the heat-conducting device 512. The heat-conducting device 512 is used to collect steam energy and heat the circulating liquid pipe group 58. The steam is transported to the heat-conducting device 512 through the steam supply system 511. The heat-conducting device 512 collects steam so that the steam directly acts on the heat-receiving fluid in the heat-conducting device 512. Then, the water is circulated to the pipeline inside the heat-conducting roller 2 through the circulating liquid pipe group 58 to increase the temperature of the pipeline, thereby completing the heating of the heat-conducting roller 2 by the pipeline, so as to achieve the heating of the heat-conducting roller 2 by using steam to heat the water circulation. Among them, the steam supply system 511 is an external steam supply device connected to the pipeline.

[0068] Specifically, the heat exchange device 512 includes a heated sleeve 5121 and a plurality of heat exchange microtubes 5122. The heat exchange microtubes 5122 are connected to the steam supply system 511. The plurality of heat exchange microtubes 5122 are arranged inside the heated sleeve 5121. The heated sleeve 5121 is connected to the circulating liquid pipe group 58, so that the heat exchange microtubes 5122 can provide a centralized collection position for steam while being connected to the steam supply system 511, so that the steam can directly act on the plurality of heat exchange microtubes 5122, and then the heat transfer is completed by the heat exchange microtubes 5122 contacting the water in the heated sleeve 5121, thereby quickly heating the water circulation system and realizing the process of transferring the heat in the steam to the circulating liquid pipe group 58.

[0069] Furthermore, the heat-conducting roller 2 is coaxially provided with a liquid slip ring 510, and the liquid slip ring 510 is connected between the circulating liquid pipe group 58 and the pipeline 55. By providing the liquid slip ring 510, the problem of twisting, entanglement or breakage of the circulating liquid pipe group 58 during the rotation of the heat-conducting roller 2 can be avoided, which is suitable for pipeline transportation conditions.

[0070] It should be noted that the specific structure, installation method and working principle of the electric slip ring 54 and the liquid slip ring 510 are common knowledge to those skilled in the art and will not be elaborated here.

[0071] Furthermore, the heat-conducting roller 2 is equipped with a synchronous motor 10, and the output shaft of the synchronous motor 10 is coaxially fixedly connected to the heat-conducting roller 2. The synchronous motor 10 can control the rotation speed of the heat-conducting roller 2 to synchronize the conveying speed of the electrode, thereby reducing the sliding friction of the electrode during the conveying process, reducing the possibility of damage to the electrode, and thus improving the production quality of the lithium battery.

[0072] In addition, the coating electrode drying equipment also includes a capture system 6, which is arranged in the box 1 and is used to collect the solvent generated in the box 1 when the coating material is heated. The capture system 6 includes a wind circulation mechanism 61 and a condensation mechanism 62. The wind circulation mechanism 61 is connected to the box 1 and is used to transport the gaseous solvent generated in the box 1 when the coating material is heated to the condensation mechanism 62. The condensation mechanism 62 is arranged in the box 1 and is used to condense and collect the gaseous solvent. Under the action of the capture system 6, the solvent generated by the coating material when heated can be taken away to ensure the cleanliness and safety of the working environment and meet the requirements of energy conservation and emission reduction. The gaseous solvent generated by the coating material is transported to the condensation mechanism 62 under the action of the wind circulation mechanism 61 to prevent the gaseous solvent from condensing inside the box 1 and affecting the stability and cleanliness of the working environment, and the condensation mechanism 62 can condense the gaseous solvent and complete liquid collection, while meeting the requirements of green production.

[0073] Specifically, the air circulation mechanism 61 includes a ventilation box 612 and an exhaust fan 613, the blower 611 and the exhaust fan 613 are both connected to the box body 1, the ventilation box 612 is connected and arranged between the blower 611 and the box body 1, the exhaust fan 613 is arranged at the condensation mechanism 62 and is used to extract the remaining gas after passing through the condensation mechanism 62, wherein the blower 611 cooperates with the ventilation box 612 to complete the air supply, and the exhaust fan 613 completes the exhaust, so as to form an air cycle to maintain the circulation of the air inside the box body 1, and drive the gaseous solvent inside the box body 1 to be transported to the condensation mechanism 62 for condensation treatment, and then the remaining gas is extracted by the exhaust fan 613 arranged at the condensation mechanism 62, ensuring the condensation treatment of the gaseous solvent and the effective discharge of the remaining gas.

[0074] The condensation mechanism 62 includes a condensation plate 621, a circulating condensation pipe 622 and a water chiller 623. The condensation plate 621 is arranged inside the housing 1 and is surrounded by the housing 1 to form a condensation area. The circulating condensation pipe 622 is arranged inside the condensation area and is used to cool the condensation plate 621. The water chiller 623 is connected to the circulating condensation pipe 622. The condensation plate 621 is provided with a plurality of through holes 624. A collecting tank 7 is provided inside the housing 1 at a position corresponding to the bottom end of the condensation plate 621. The collecting tank 7 is connected to the condensation area through the through holes 624 and is lower in height than the condensation area. The water chiller 623 cools the liquid in the circulating condensation pipe 622 so that the cooling liquid circulates in the condensation area. The condensation plate 621 is continuously cooled to form a low-temperature surface, so that when the gaseous solvent passes through the condensation plate 621, part of the gaseous solvent can condense on the condensation plate 621 and slide into the collection tank 7 at the bottom to complete a collection operation. The remaining gaseous solvent enters the condensation area through a number of through holes 624 and condenses on the circulating condensation pipe 622 and slides to the bottom of the condensation area. Since the height of the collection tank 7 is lower than the condensation area and is connected to the condensation area through the through holes 624, the condensed liquid in the condensation area can flow into the collection tank 7 through the through holes 624 to complete a secondary collection operation, thereby realizing the condensation and collection of the gaseous solvent and achieving the effect of keeping the interior of the box 1 dry.

[0075] The implementation principle of a coating electrode drying device in the embodiment of the present application is as follows: (1) Pole piece baking: After the pole piece is coated, under the temperature control of each heating system 5, the pole piece passes through the loading port 3 and is sequentially wound around a number of heat-conducting rollers 2 with increasing temperatures, and is dried with hot air in combination with a number of air ducts 8 on the surface of each heat-conducting roller 2, completing the joint baking operation of non-contact drying and contact drying, so that the coating material on the pole piece is sequentially heated at multiple stages and then discharged from the unloading port 4.

[0076] (2) Solvent recovery: During the baking process, the blower 611 cooperates with the ventilation box 612 to supply air to the interior of the box 1 to drive the gaseous solvent generated by the coating material to be transported to the condensation plate 621. After passing through the condensation plate 621, the gaseous solvent is partially condensed on the condensation plate 621 and slides into the collection tank 7 at the bottom. The remaining gaseous solvent enters the condensation area through the through hole 624 and condenses on the circulation condensation pipe 622 and slides to the bottom of the condensation area. Then, it flows back to the collection tank 7 through the through hole 624 of the condensation plate 621, completing the liquid recovery of the gaseous solvent. The remaining gaseous solvent is discharged from the outside of the box 1 under the action of the exhaust fan 613, completing the air circulation of the box 1.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A coating electrode drying device, characterized in that: include: A box body (1), wherein a heat-conducting roller (2) for contacting an electrode is rotatably arranged inside the box body (1), and the box body (1) is provided with a loading port (3) and a unloading port (4), and the electrode is fed from the loading port (3) and wound around the heat-conducting roller (2), and then discharged from the unloading port (4), and a heating system (5) is arranged inside the heat-conducting roller (2), and the heating system (5) is used to heat the heat-conducting roller (2) and adjust the temperature of the heat-conducting roller (2), and a plurality of air ducts (8) are arranged inside the box body (1).

2. A coating electrode drying device as claimed in claim 1, characterized in that: A plurality of the air ducts (8) are arranged radially along the heat-conducting roller (2), the pipe openings of the air ducts (8) are all facing the roller surface of the heat-conducting roller (2), and the air ducts (8) are connected to a blower (611) and are provided with a regulating valve (9).

3. A coating electrode drying device as claimed in claim 1, characterized in that: The air duct (8) is provided with an electric heating wire for generating heat inside.

4. A coating electrode drying device as claimed in claim 1, characterized in that: The plurality of air ducts (8) are arranged along the circumference direction of the heat-conducting roller (2) or along the axial direction of the heat-conducting roller (2).

5. The coating electrode drying device according to claim 1, characterized in that: The plurality of air ducts (8) are arranged obliquely on the heat-conducting roller (2) to form an angle with the heat-conducting roller (2).

6. The coating electrode drying device according to claim 1, characterized in that: The shape of the opening of the air duct (8) is circular, rectangular or flat slit-shaped.

7. The coating electrode drying device according to claim 1, characterized in that: A mounting frame (12) is arranged inside the box body (1), and a plurality of the air ducts (8) are hingedly arranged on the mounting frame (12).

8. The coating electrode drying device according to claim 3, characterized in that: An airflow detection sensor is arranged in the air duct (8), and the airflow detection sensor is used to detect the temperature, flow rate and flow velocity of the gas.

9. The coating electrode drying device according to claim 1, characterized in that: The heat-conducting roller (2) is provided with a temperature sensor, a cylindricity detection device and a smoothness detection device.

10. The coating electrode drying device according to claim 1, characterized in that: A plurality of heat-conducting rollers (2) are provided, and the pole pieces are fed from the feeding port (3) and are sequentially wound around each heat-conducting roller (2) before being discharged from the feeding port (4).

11. The coating electrode drying device according to claim 1, characterized in that: The heating system (5) comprises a plurality of electric heating rods (51) for generating heat, wherein the plurality of electric heating rods (51) are arranged on the inner side wall of the heat-conducting roller (2) along the circumference direction of the heat-conducting roller (2), and the inner side wall of the heat-conducting roller (2) is provided with a plurality of temperature probes along its own circumference direction.

12. A coating electrode drying device as claimed in claim 11, characterized in that: A plurality of the electric heating rods (51) are arranged in a spiral distribution on the inner side wall of the heat-conducting roller (2).

13. The coating electrode drying device according to claim 11, characterized in that: The electric heating rod (51) is electrically connected to an external electric box (53) via a wire (52); the heat-conducting roller (2) is coaxially provided with an electric slip ring (54); and the electric slip ring (54) is electrically connected between the wire (52) and the external electric box (53).

14. The coating electrode drying device according to claim 1, characterized in that: The heating system (5) comprises a plurality of pipelines (55), a liquid storage tank (56), a pump body (57) and a circulating liquid pipe group (58); the plurality of pipelines (55) are arranged in a spiral distribution on the inner wall of the heat-conducting roller (2); the liquid storage tank (56) is filled with a heat-receiving fluid and a heating element for heating the heat-receiving fluid; the circulating liquid pipe group (58) is arranged in communication between the liquid storage tank (56) and any one of the pipelines (55); and the pump body (57) is arranged in communication between the liquid storage tank (56) and the circulating liquid pipe group (58).

15. The coating electrode drying device according to claim 1, characterized in that: The heating system (5) comprises a pipeline (55), a liquid storage tank (56), a pump body (57) and a circulating liquid pipe group (58). The heat-conducting roller (2) is provided with a plurality of liquid guide holes (59). The plurality of liquid guide holes (59) are arranged along the circumference of the heat-conducting roller (2). Adjacent liquid guide holes (59) are connected through the pipeline (55). The liquid storage tank (56) contains a heat-receiving fluid and a heating element for heating the heat-receiving fluid. The circulating liquid pipe group (58) is arranged in communication between the liquid storage tank (56) and any one of the pipelines (55). The pump body (57) is arranged in communication between the liquid storage tank (56) and the circulating liquid pipe group (58).

16. The coating electrode drying device according to claim 1, characterized in that: The heating system (5) comprises a steam supply system (511), a heat exchange device (512), a plurality of pipelines (55) and a circulating liquid pipe group (58); the plurality of pipelines (55) are arranged on the inner wall of the heat-conducting roller (2); the circulating liquid pipe group (58) is arranged in communication between the heat exchange device (512) and any of the pipelines (55); the steam supply system (511) is used to transport steam to the heat exchange device (512); and the heat exchange device (512) is used to collect steam energy and heat the circulating liquid pipe group (58).

17. A coating electrode drying device as claimed in claim 16, characterized in that: The heat exchange device (512) comprises a heated sleeve (5121) and a plurality of heat exchange micro-tubes (5122); the heat exchange micro-tubes (5122) are arranged in communication with the steam supply system (511); the plurality of heat exchange micro-tubes (5122) are arranged inside the heated sleeve (5121); and the heated sleeve (5121) is arranged in communication with the circulating liquid pipe group (58).

18. A coating electrode drying device as claimed in claim 14, 15 or 16, characterized in that: The heat-conducting roller (2) is coaxially provided with a liquid slip ring (510), and the liquid slip ring (510) is connected between the circulating liquid pipe group (58) and the pipeline (55).

19. The coating electrode drying device according to claim 1, characterized in that: The heat-conducting roller (2) is equipped with a synchronous motor (10), and the output shaft of the synchronous motor (10) is coaxially fixedly connected to the heat-conducting roller (2).

20. The coating electrode drying device according to claim 2, characterized in that: The invention also comprises a capturing system (6), wherein the capturing system (6) is arranged in the housing (1) and is used to collect the solvent generated in the housing (1) when the coating material is heated. The capturing system (6) comprises an air circulation mechanism (61) and a condensation mechanism (62). The air circulation mechanism (61) is arranged in communication with the housing (1) and is used to transport the gaseous solvent generated in the housing (1) when the coating material is heated to the condensation mechanism (62). The condensation mechanism (62) is arranged in the housing (1) and is used to condense and collect the gaseous solvent.

21. A coating electrode drying device as claimed in claim 20, characterized in that: The air circulation mechanism (61) includes a ventilation box (612) and an exhaust fan (613); the blower (611) and the exhaust fan (613) are both connected to the box body (1); the ventilation box (612) is connected and arranged between the blower (611) and the box body (1); the exhaust fan (613) is arranged at the condensation mechanism (62) and is used to extract the remaining gas after passing through the condensation mechanism (62).

22. The coating electrode drying device according to claim 20, characterized in that: The condensation mechanism (62) comprises a condensation plate (621), a circulating condensation pipe (622) and a chiller (623); the condensation plate (621) is arranged inside the housing (1) and is surrounded by the housing (1) to form a condensation area; the circulating condensation pipe (622) is arranged inside the condensation area and is used to cool the condensation plate (621); the chiller (623) is connected to the circulating condensation pipe (622); the condensation plate (621) is provided with a plurality of through holes (624); a collecting trough (7) is provided inside the housing (1) at a position corresponding to the bottom end of the condensation plate (621); the collecting trough (7) is connected to the condensation area through the through holes (624) and is lower in height than the condensation area.

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