Coating pole piece drying equipment

Abstract

The utility model 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 rotatably 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 utility model relates to the technical field of lithium battery coating, 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 existing technology, 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 the coating material from the outer layer to the inner layer, 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 is the same as that in hot air drying, resulting in electrode defects such as craters and white spots. In addition, the existing baking equipment still uses a split layout of recovery equipment to recycle the solvent generated after baking the coating material, lacking effective integration and urgently needs to be solved. Utility Model Content

[0003] In response to the above-mentioned deficiencies in the prior art, the present application provides a coating electrode drying device, which uses a heat-conducting roller in combination with a heating system to perform contact heating and drying of the electrode, and an air duct in combination with an electric heating wire to perform non-contact heat conduction on the electrode, thereby simultaneously heating the outer and inner layers of the coating material. By adjusting the heating temperature of the two methods, the drying progress of the inner and outer layers of the coating material is synchronized, thereby significantly improving the baking efficiency and heating uniformity of the coating material, and increasing the flexibility of the baking equipment, thereby solving problems such as low heating efficiency and uneven heating, as well as electrode defects such as craters and white spots.

[0004] 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.

[0005] The above invention objectives of this application are achieved through the following technical solutions:

[0006] A box body is provided with a heat-conducting roller for contacting the electrode, the box body is provided with a loading port and a unloading port, the electrode is fed from the loading port and wound around the heat-conducting roller, and then discharged from the unloading port, a heating system is provided 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 provided in the box body.

[0007] Preferably, a plurality of the air ducts are arranged radially along the heat-conducting roller, the pipe ends 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.

[0008] Preferably, a heating wire for generating heat is provided inside the air duct.

[0009] Preferably, the plurality of air ducts are arranged along the circumference direction of the heat-conducting roller or along the axial direction of the heat-conducting roller.

[0010] Preferably, the plurality of air ducts are arranged obliquely to the heat-conducting roller to form an angle with the heat-conducting roller.

[0011] Preferably, the shape of the nozzle of the air duct is circular, rectangular or flat slit.

[0012] Preferably, a mounting frame is provided inside the box, and a plurality of the air ducts are hingedly provided on the mounting frame.

[0013] 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.

[0014] Preferably, the heat-conducting roller is provided with a temperature sensor, a cylindricity detection device and a smoothness detection device.

[0015] Preferably, a plurality of heat-conducting rollers are provided, and the electrode pieces are fed from the feeding port and sequentially wound around each heat-conducting roller before being discharged from the feeding port.

[0016] Preferably, the heating system includes a plurality of electric heating rods for generating heat, and 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.

[0017] Preferably, a plurality of the electric heating rods are spirally distributed on the inner side wall of the heat-conducting roller.

[0018] 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, which is electrically connected between the wire and the external electric box.

[0019] 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.

[0020] 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.

[0021] Preferably, the heating system includes a steam supply system, a heat exchange device, a plurality of pipelines and a circulating liquid pipe group, wherein the plurality of pipelines are arranged on the inner wall of the heat-conducting roller and are filled with a heat-receiving fluid, and 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.

[0022] Preferably, the heat exchange device includes 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Preferably, the condensation mechanism includes a condensation plate, a circulating condensation pipe and a chiller. The condensation plate is arranged inside the box and is surrounded by the box to form a condensation area. The circulating condensation pipe is arranged inside the condensation area and is used to cool the condensation plate. The chiller is connected to the circulating condensation pipe. The condensation plate is provided with a plurality of through holes. A collection tank is provided inside the box corresponding to the bottom end of the condensation plate. The collection tank is connected to the condensation area through the through holes and is lower in height than the condensation area.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 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 duct, thereby performing hot air drying on the coated surface of the electrode, that is, through non-contact heat conduction, heat is transferred from the outer layer to the inner layer of the coating material, and the contact heat conduction of the heat-conducting roller is used to achieve simultaneous heating of the outer and inner layers of the coating 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 separately 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 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.

[0030] By setting up the mounting frame, the air duct is provided with a rotating mounting position, 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.

[0031] 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 perform contact heating and drying on the electrode from the inside to the outside. Moreover, 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 coating 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.

[0032] When electric heating is used, the heat-conducting roller is heated by energizing the electric heating rod, and 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 set along the circumference of the heat-conducting roller to monitor the temperature of various parts of the heat-conducting roller.

[0033] 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 conduction efficiency.

[0034] 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.

[0035] 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. 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.

[0036] 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 conduct the heat to the outer surface of the heat-conducting roller, thereby realizing heat conduction to the electrode.

[0037] When steam heating is adopted, the steam supply system transports steam to the heat exchange device. The heat exchange device collects the steam and makes the steam act directly 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.

[0038] 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.

[0039] The synchronous motor can control the rotation speed of the heat transfer roller 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 lithium batteries.

[0040] 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. Among them, the gaseous solvent generated by the coating material is transported to the condensation mechanism under the action of the air 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, while meeting the requirements of green production.

[0041] The blower is combined with the ventilation box to complete the air supply, and the exhaust fan is used to complete the exhaust, so as to form an air 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. The remaining gas is then extracted by the exhaust fan installed at the condensation mechanism to ensure the condensation treatment of the gaseous solvent and the effective discharge of the remaining gas.

[0042] The chiller cools the liquid in the circulating condenser tube so that the cooling liquid circulates in the condensation area, continuously cooling the condensation plate to form a low-temperature surface. As a result, 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 secondary collection, thereby realizing the condensation and collection of the gaseous solvent and achieving the effect of keeping the inside of the box dry.

[0043] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative labor.

[0045] Figure 1 This is a structural schematic diagram of the coating electrode drying equipment in one embodiment of the present invention with part of the box body removed.

[0046] Figure 2 This is a schematic structural diagram of a heat-conducting roller in one embodiment of the present invention;

[0047] Figure 3 This is a schematic cross-sectional view of a heat-conducting roller in one embodiment of the present invention;

[0048] Figure 4 This is a structural diagram of a coating electrode drying device in another embodiment of the present invention with part of the box removed;

[0049] Figure 5 yes Figure 4 A partial enlarged schematic diagram of part A;

[0050] Figure 6This is a schematic cross-sectional view of a heat-conducting roller in another embodiment of the present invention;

[0051] Figure 7 This is a schematic structural diagram of a heat-conducting roller in another embodiment of the present invention;

[0052] Figure 8 This is a structural diagram of a coating electrode drying device in another embodiment of the present invention with part of the box removed;

[0053] Figure 9 This is a structural diagram of the connection system between the heating system and the heat-conducting roller in another embodiment of the present invention.

[0054] Figure 10 This is another structural schematic diagram of the coating electrode drying equipment in one embodiment of the present invention after part of the box body is cut away;

[0055] Figure 11 yes Figure 10 A partial enlarged schematic diagram of part B.

[0056] 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 condensing pipe; 623. Chiller; 624. Through hole; 7. Collection tank; 8. Air duct; 9. Control valve; 10. Synchronous motor; 11. Water valve; 12. Mounting frame. DETAILED DESCRIPTION

[0057] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a 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 making creative efforts are within the scope of protection of the present invention.

[0058] It should be noted that the terms "first," "second," and the like in this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the disclosure described herein can be implemented in an order other than that illustrated or described herein. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present disclosure.

[0059] See also Figures 1 to 11 In an embodiment of the present invention, a coated electrode drying device is provided, which includes: a box body 1 and a control system. A heat-conducting roller 2 for contacting the electrode is rotatably provided 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 provided 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 provided in the box body 1. The control system is electrically connected to the heating system 5.

[0060] Specifically, a number 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 the 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 duct 8 to allow the gaseous solvent generated after the coating material is heated to flow, thereby avoiding contamination of the electrode.

[0061] Furthermore, electric heating wires for heating are provided 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. The high-temperature hot air 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.

[0062] 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 out, and the air sent into the air duct 8 by the blower 611 is heated by the electric heating wire inside the air duct 8 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 coating 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 coating 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 regulated 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 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.

[0063] 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 .

[0064] In one embodiment, a plurality of air ducts 8 are obliquely disposed 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.

[0065] In one embodiment, the shape of the nozzle 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.

[0066] In one embodiment, an air flow detection sensor (not shown in the figure) is provided in the air duct 8. 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.

[0067] It should be noted that the airflow detection sensor can adopt conventional instruments and equipment on the market. Its working principle and specific structure are common knowledge to those skilled in the art and will not be described in detail here.

[0068] Furthermore, a mounting frame 12 is provided inside the box body 1, and several 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 direction of the hot air.

[0069] 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). The control system is electrically connected to the temperature sensor, the cylindricity detection device and the smoothness detection device to facilitate the staff to monitor the working status of the heat-conducting roller 2.

[0070] 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. Their working principles and specific structures are common knowledge to those skilled in the art and will not be elaborated here.

[0071] Furthermore, a plurality of heat-conducting rollers 2 are provided, and the electrode pieces are fed from the feeding port 3 and wound around each heat-conducting roller 2 in sequence before being discharged from the feeding port 4 .

[0072] Specifically, during operation, after the electrode is coated, it is wound around each heat-conducting roller 2 in sequence through the inside of the box 1. 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 increased along the direction of electrode conveying, so that the coating material can complete multi-stage heating in sequence to avoid defects of the electrode caused by excessively 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.

[0073] It should be noted that, in this embodiment, there is a height difference between the loading port 3 and the unloading port 4 in the vertical direction of the box body 1. After the electrode is fed from the loading port 3 and wound around each heat-conducting roller 2 in turn, the conveying route for discharging from the unloading port 4 forms a "匚" shape. By setting a "匚"-shaped electrode conveying route and matching the loading port 3 and the unloading port 4 with a height difference in the vertical direction, the horizontal and vertical space inside the box body 1 can be utilized to the greatest extent, so that the electrode can be wound around multiple heat-conducting rollers 2 with increasing temperatures in turn to achieve gradual and uniform drying, which can improve the electrode drying effect and optimize the layout of the baking line to reduce the floor space of the baking equipment.

[0074] In addition, in one embodiment, the heating system 5 includes a plurality of electric heating rods 51 for generating heat, and the plurality of electric heating rods 51 are arranged on the inner wall of the heat-conducting roller 2 along the circumference direction of the heat-conducting roller 2. The inner wall of the heat-conducting roller 2 is provided with a plurality of temperature probes along its own circumference direction, so that the heat-conducting roller 2 can be electrically heated, and heat is generated by energizing the electric heating rods 51, so that heat is directly conducted to the outer surface of the heat-conducting roller 2 to achieve heat conduction to the electrode, and at the same time, a plurality of temperature probes are arranged along the circumference direction of the heat-conducting roller 2 to facilitate monitoring of the temperature of various parts of the heat-conducting roller 2.

[0075] Furthermore, a plurality of electric heating rods 51 are spirally distributed on the inner side wall of the heat-conducting roller 2 , which can increase the contact area between the electric heating rods 51 and the heat-conducting roller 2 , thereby improving the heat conduction efficiency.

[0076] Furthermore, the electric heating rod 51 is electrically connected to the external electrical box 53 through the wire 52, and the heat-conducting roller 2 is coaxially provided with an electric slip ring 54, which is electrically connected between the wire 52 and the external electrical box 53. By providing the electric slip ring 54, the wire 52 can be prevented from twisting, entangled or breaking during the rotation of the heat-conducting roller 2, which is suitable for working conditions where the power wire 52 is transmitted.

[0077] 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 wall of the heat-conducting roller 2. 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 pipeline 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 between 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. The spirally distributed pipeline 55 then conducts the heat to the outer surface of the heat-conducting roller 2 through contact heat conduction to achieve heat conduction to the electrode.

[0078] 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 by 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 pipeline 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 between 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.

[0079] 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 heated 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. 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 heated fluid in the heat-conducting device 512. Water is then 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 heating of the heat-conducting roller 2 by using steam-heated water circulation. Among them, the steam supply system 511 is an external steam supply device connected to the pipeline.

[0080] 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.

[0081] Furthermore, the heat-conducting roller 2 is coaxially provided with a liquid slip ring 510, which is connected between the circulating liquid pipe group 58 and the pipeline 55. By providing the liquid slip ring 510, the circulating liquid pipe group 58 can be prevented from twisting, entanglement or breaking during the rotation of the heat-conducting roller 2, which is suitable for pipeline transportation conditions.

[0082] 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 described in detail here.

[0083] 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.

[0084] 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 an air circulation mechanism 61 and a condensation mechanism 62. The air 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 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 62 under the action of the air 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.

[0085] 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. Among them, the blower 611 is combined with the ventilation box 612 to complete the air supply, and the exhaust fan 613 completes the exhaust to form an air circulation to maintain the circulation of 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. Then the remaining gas is extracted by the exhaust fan 613 arranged at the condensation mechanism 62 to ensure the condensation treatment of the gaseous solvent and the effective discharge of the remaining gas.

[0086] And the condensing mechanism 62 comprises a condensing plate 621, a circulating condensing pipe 622 and a chiller 623, the condensing plate 621 is arranged in the box 1 and is surrounded by the box 1 to form a condensing area, the circulating condensing pipe 622 is arranged in the condensing area and is used for refrigerating the condensing plate 621, and the chiller 623 is communicated with the circulating condensing pipe 622; the condensing plate 621 is provided with a plurality of through holes 624, and a collecting groove 7 is arranged in the box 1 and is communicated with the condensing area through the through holes 624 and has a height lower than that of the condensing area; the chiller 623 cools the liquid in the circulating condensing pipe 622, so that the cooled liquid circulates in the condensing area, continuously refrigerates the condensing plate 621, forms a low-temperature surface, and thus part of the gaseous solvent can condense on the condensing plate 621 when passing through the condensing plate 621 and slide into the collecting groove 7 at the bottom to complete the first collection, and the remaining gaseous solvent condenses on the circulating condensing pipe 622 after entering the condensing area through the through holes 624 and slides to the bottom of the condensing area; because the collecting groove 7 has a height lower than that of the condensing area and is communicated with the condensing area through the through holes 624, the condensed liquid in the condensing area can flow into the collecting groove 7 through the through holes 624 to complete the second collection, so that the condensation and collection of the gaseous solvent are realized, and the dryness of the inside of the box 1 is maintained.

[0087] The implementation principle of the coating pole piece drying equipment is as follows:

[0088] (1) Pole piece baking: after the pole piece is coated, under the temperature regulation of each heating system 5, the pole piece passes through the feeding port 3 and is sequentially wound on a plurality of temperature-increasing heat-conducting rollers 2, and is subjected to hot air drying in cooperation with a plurality of air pipes 8 on the surface of each heat-conducting roller 2, so that the non-contact drying and the contact drying are combined to complete the baking operation, and the coating material on the pole piece is sequentially subjected to multi-stage heating and is discharged from the discharging port 4.

[0089] (2) Solvent recovery: during the baking process, the air blower 611 cooperates with the ventilation box 612 to send air to the inside of the box 1 to drive the gaseous solvent generated by the coating material to the condensing plate 621, part of the gaseous solvent condenses on the condensing plate 621 after passing through the condensing plate 621 and slides into the collecting groove 7 at the bottom, the remaining gaseous solvent condenses on the circulating condensing pipe 622 after entering the condensing area through the through holes 624 and slides to the bottom of the condensing area, and then flows back to the collecting groove 7 through the through holes 624 of the condensing plate 621 to complete the liquid recovery of the gaseous solvent, and the remaining gaseous solvent is discharged outside the box 1 under the action of the air extractor 613 to complete the air circulation of the box 1.

[0090] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A coating electrode drying device, characterized in that: include: A box (1) is provided with a heat-conducting roller (2) for contacting the electrode in a rotating manner inside the box (1). The box (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) before being discharged from the unloading port (4). A heating system (5) is provided 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 provided inside the box (1).

2. The coating electrode drying device according to claim 1, characterized in that: A plurality of air ducts (8) are arranged radially along the heat-conducting roller (2), the pipe ends 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. The coating electrode drying device according to claim 1, characterized in that: The air duct (8) is provided with a heating wire for generating heat.

4. The coating electrode drying device according to 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 pipe 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 provided inside the box body (1), and a plurality of the air ducts (8) are hingedly provided on the mounting frame (12).

8. The coating electrode drying device according to claim 3, characterized in that: An airflow detection sensor is provided 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 sequentially wound around each heat-conducting roller (2), and then 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. The coating electrode drying device according to claim 11, characterized in that: A plurality of the electric heating rods (51) are spirally distributed and arranged 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 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), wherein the plurality of pipelines (55) are spirally distributed and arranged on the inner wall of the heat-conducting roller (2), 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 of the pipelines (55), and the pump body (57) is connected 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) 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).

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 side 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. The coating electrode drying device according to claim 16, characterized in that: The heat exchange device (512) comprises a heated sleeve (5121) and a plurality of heat exchange microtubes (5122); the heat exchange microtubes (5122) are arranged in communication with the steam supply system (511); the plurality of heat exchange microtubes (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. The coated electrode drying device according to 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 includes a capture system (6), which 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 capture system (6) includes an air circulation mechanism (61) and a condensation mechanism (62). The air circulation mechanism (61) is connected to 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. The coating electrode drying device according to 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 condensing mechanism (62) and is used to extract the remaining gas after passing through the condensing mechanism (62).

22. The coating electrode drying device according to claim 20, characterized in that: The condensation mechanism (62) includes a condensation plate (621), a circulating condensation pipe (622) and a chiller (623); the condensation plate (621) is arranged inside the box (1) and is surrounded by the box (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 tank (7) is provided inside the box (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.

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