Coating pole piece baking equipment

Abstract

The utility model relates to the technical field of lithium battery coating, in particular to coated pole piece baking equipment, which comprises a working box body, a heat conduction roller is rotatably arranged in the working box body, the working box body is provided with a feed port and a discharge port, a coated pole piece is fed from the feed port and wound on the heat conduction roller, and the heat conduction roller is arranged on the working box body. The heat conduction roller is used for being connected with one side of the coated pole piece in an abutting mode, a heating device is arranged in the heat conduction roller, and the heating device is used for heating the heat conduction roller; the air circulation system is used for removing liquid steam generated in the working box body when a coating material is heated; the coating mechanism is used for coating the coating pole piece; the unwinding mechanism is used for unwinding the coated pole piece; and the winding mechanism is used for winding the coated pole piece. The coating material baking device has the effect of improving the baking efficiency and the heating uniformity of the coating material.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery coating, in particular to a baking device for coated electrode sheets. Background Art

[0002] In the production process of lithium batteries, the control of the moisture content of battery electrode sheets is crucial, which directly determines various performance indicators of lithium batteries. Therefore, it is necessary to control the moisture content of battery electrode sheets within a certain range. In the prior art, non-contact drying methods such as air drying, convection drying, and hot air drying are usually used to dry and remove water from battery electrode sheets. This method heats from the outer layer to the inner layer of the coating material, with low heating efficiency and uneven heating. Moreover, with the increase in production capacity and the corresponding increase in the production speed of coating equipment, battery manufacturers have higher and higher technical requirements for coating machines, and the corresponding coating speed is also getting faster and faster, resulting in an increasing length of the oven, as well as an increase in floor area and equipment cost. How to design a baking device for coated electrode sheets that can heat both the outer layer and the inner layer of the coating material simultaneously to improve the baking efficiency and heating uniformity of the coating material, and can reduce the floor area of the baking device to improve space utilization, is a technical problem that enterprise R & D personnel urgently need to solve. Summary of the Utility Model

[0003] In view of the above deficiencies in the prior art, the present application provides a baking device for coated electrode sheets.

[0004] The above-mentioned invention object of the present application is achieved through the following technical solutions:

[0005] A working box body, wherein a heat-conducting roller is rotatably arranged inside the working box body. The working box body is provided with a feed inlet and a discharge outlet. The coated electrode sheet enters from the feed inlet and winds around the heat-conducting roller, and then exits from the discharge outlet. The heat-conducting roller is used to abut against one side of the coated electrode sheet, and a heating device is arranged inside the heat-conducting roller, and the heating device is used to heat the heat-conducting roller;

[0006] An air circulation system, which is used to remove the liquid vapor generated in the working box body when the coating material is heated;

[0007] A coating mechanism, which is used to coat the coated electrode sheet;

[0008] A unwinding mechanism, which is used to unwind the coated electrode sheet;

[0009] A winding mechanism, which is used to wind the coated electrode sheet.

[0010] By adopting the above technical solution, the coated electrode is coated under the action of the coating mechanism and is conveyed to the heat-conducting roller inside the working box body. The heat-conducting roller abuts against one side of the coated electrode. Under the action of the heating device, through the way of contact heat conduction, heat can be transferred from the inner layer to the outer layer of the coating material through the coated electrode, avoiding the phenomenon of false drying of the coating material. At the same time, the air circulation system removes the liquid vapor generated when the coating material is heated, continuously taking away the solvent component to reduce the interference of the vapor on the coated electrode inside the working box body, thereby improving the baking efficiency and heating uniformity of the coating material. In addition, by using the heat-conducting roller to conduct contact heating and drying on the coated electrode, it also plays a role in guiding the conveyance of the coated electrode, enabling the conveyance process of the coated electrode to be carried out in the vertical space dimension and to turn. Compared with a linear oven, it can reduce the floor area of the baking equipment to improve the space utilization rate.

[0011] In a preferred example of the present application, it can be further configured that: a preheating channel is provided inside the working box body corresponding to the feeding port. The preheating channel is used for the coated electrode to pass through, and the heating device is used to heat the preheating channel.

[0012] By adopting the above technical solution, by setting the preheating channel, the preheating operation can be carried out on the coated electrode entering the working box body to preliminarily heat and cure the coated surface of the coated electrode, so as to reduce the possibility of the coating material detaching from the coated electrode during the conveyance process and improve the production quality of the coated electrode.

[0013] In a preferred example of the present application, it can be further configured that: the heating device includes a plurality of pipelines, a liquid storage tank, a pump body, and a first circulating liquid pipe group. The plurality of pipelines are spirally distributed on the inner side wall of the heat-conducting roller. The liquid storage tank is internally filled with a heated fluid and is provided with a heating element for heating the heated fluid. The first circulating liquid pipe group is connected between the liquid storage tank and any one of the pipelines, and the pump body is connected between the liquid storage tank and the first circulating liquid pipe group.

[0014] By adopting the above technical solution, a complete liquid heating circulation system is formed among the liquid storage tank, the pipelines, the pump body, and the first circulating liquid pipe group. After the heated fluid is heated inside the liquid storage tank, it is conveyed to the pipelines through the first circulating liquid pipe group under the action of the pump body. The pipelines distributed in a spiral shape conduct heat to the outer surface of the heat-conducting roller through contact heat conduction to achieve the heat conduction effect on the coated electrode.

[0015] In a preferred example, the present application can be further configured as follows: the heating device includes a plurality of pipelines, a liquid storage tank, a pump body, and a first circulating liquid pipe group. The heat-conducting roller is provided with a plurality of liquid guide holes, and the plurality of liquid guide holes are arranged along the circumferential direction of the heat-conducting roller. Adjacent liquid guide holes are communicated through the pipelines. The liquid storage tank is internally filled with a heat-absorbing fluid and is provided with a heating element for heating the heat-absorbing fluid. The first circulating liquid pipe group is communicatively arranged between the liquid storage tank and any one of the pipelines, and the pump body is communicatively arranged between the liquid storage tank and the first circulating liquid pipe group.

[0016] By adopting the above technical solution, a complete liquid heating circulation system is formed among the liquid storage tank, the pipelines, the pump body, and the first circulating liquid pipe group. After the heat-absorbing fluid is heated inside the liquid storage tank, it is transported to the pipelines through the first circulating liquid pipe group under the action of the pump body, and then transported into each liquid guide hole to conduct heat to the outer surface of the heat-conducting roller, so as to realize the heat conduction effect on the coated electrode sheet.

[0017] In a preferred example, the present application can be further configured as follows: a liquid slip ring is coaxially arranged on the heat-conducting roller, and the liquid slip ring is communicated between the first circulating liquid pipe group and the pipelines.

[0018] By adopting the above technical solution, by arranging the liquid slip ring, the problems of twisting, winding, or breaking of the first circulating liquid pipe group during the rotation of the heat-conducting roller can be avoided, which is suitable for the working conditions of pipeline transportation.

[0019] In a preferred example, the present application can be further configured as follows: the heating device includes a plurality of electric heating rods, and all the plurality of electric heating rods are used for generating heat. The plurality of electric heating rods are arranged along the circumferential direction of the heat-conducting roller on the inner side wall of the heat-conducting roller, and a plurality of temperature probes are arranged along the circumferential direction of the inner side wall of the heat-conducting roller.

[0020] By adopting the above technical solution, the electric heating rods can be electrified to generate heat, so as to directly conduct heat to the outer surface of the heat-conducting roller to realize the heat conduction effect on the coated electrode sheet. At the same time, by arranging a plurality of temperature probes along the circumferential direction of the heat-conducting roller, it is convenient to monitor the temperature at various places of the heat-conducting roller.

[0021] In a preferred example, the present application can be further configured as follows: the plurality of electric heating rods are spirally distributed on the inner side wall of the heat-conducting roller.

[0022] By adopting the above technical solution, the contact area between the electric heating rods and the heat-conducting roller can be increased, thereby improving the heat conduction efficiency.

[0023] In a preferred embodiment, the present application can be further configured as follows: The electric heating rod is electrically connected to an external electric box through a wire. A slip ring is coaxially arranged on the heat conducting roller, and the slip ring is electrically connected between the wire and the external electric box.

[0024] By adopting the above technical solution, the slip ring is provided to avoid the problems of twisting, winding or breaking of the wire during the rotation of the heat conducting roller, which is applicable to the working conditions of power wire transmission.

[0025] In a preferred embodiment, the present application can be further configured as follows: The air circulation system includes a blower and a ventilation box. The blower is arranged outside the working box body, and the ventilation box is communicatively connected between the blower and the working box body.

[0026] By adopting the above technical solution, the blower and the ventilation box can send external air into the working box body through the ventilation box.

[0027] In a preferred embodiment, the present application can be further configured as follows: A number of heating tubes for generating heat are arranged inside the ventilation box.

[0028] By adopting the above technical solution, the number of heating tubes inside the ventilation box heat the incoming air through heat generation to form high-temperature hot air. After the high-temperature hot air enters the closed working box body, it can hot air dry the coating surface of the coated electrode sheet. That is, through non-contact heat conduction, heat can be transferred from the outer layer to the inner layer of the coating material, so as to realize heating the outer layer and the inner layer of the coating material simultaneously, improving the baking efficiency and heating uniformity of the coating material.

[0029] In a preferred embodiment, the present application can be further configured as follows: A number of the heating tubes are spirally distributed inside the ventilation box.

[0030] By adopting the above technical solution, the heating area of the heating tubes can be increased, and the heating efficiency can be improved.

[0031] In a preferred embodiment, the present application can be further configured as follows: The blower is communicatively connected with a filter channel, and a filter screen is arranged inside the filter channel.

[0032] By adopting the above technical solution, the filter channel and the filter screen are provided to protect the blower, improve the cleanliness of the gas inside the working box body, and reduce the possibility of the coated electrode sheet being contaminated.

[0033] In a preferred embodiment, the present application can be further configured as follows: The working box body is provided with a circulating air duct. The communicating ends of the circulating air duct are all communicatively connected to the working box body, and the circulating air duct is provided with an NMP recovery device.

[0034] By adopting the above technical solution, the NMP recovery device can recover the waste gas generated during the heating process of the coating material, realize recycling, and recycle the clean gas back into the working box through the circulating air duct, so as to effectively reduce the pollution to the pole piece or the environment, reduce resource waste, meet the requirements of energy conservation and emission reduction, and at the same time can collect the liquid vapor generated when the coating material is heated.

[0035] In a preferred example of the present application, it can be further configured that: an explosion-proof port is opened at the top of the working box body, the explosion-proof port is covered with an explosion-proof cover, and a chain is fixedly connected between the end of the explosion-proof port and the explosion-proof cover.

[0036] By adopting the above technical solution, the explosion-proof cover closes the explosion-proof port under the action of its own gravity. When the internal pressure is greater than the gravity of the explosion-proof cover, the explosion-proof cover will be lifted to achieve the purpose of pressure relief, thereby improving the safety of the equipment. And a chain is equipped between the explosion-proof port and the explosion-proof cover to restrain the explosion-proof cover and further improve safety.

[0037] In a preferred example of the present application, it can be further configured that: an air outlet channel is opened at the top of the working box body, and an air valve actuator and a centrifugal fan are connected in communication with the air outlet channel.

[0038] By adopting the above technical solution, setting the air outlet channel in cooperation with the air valve actuator can timely discharge the liquid vapor generated when the coating material is heated, and at the same time can play a role in adjusting the internal pressure of the working box body. And by equipping a centrifugal fan, it can play a role in quickly relieving pressure when necessary.

[0039] In summary, the present application includes at least one of the following beneficial technical effects:

[0040] 1. The coated pole piece is coated under the action of the coating mechanism and is then transported to the heat conduction roller through the inside of the working box body. The heat conduction roller abuts against one side of the coated pole piece. Under the action of the heating device, through the way of contact heat conduction, the heat can be transferred from the inner layer to the outer layer of the coating material through the coated pole piece, avoiding the phenomenon of false drying of the coating material. At the same time, the air circulation system removes the liquid vapor generated when the coating material is heated and continuously takes away the solvent component to reduce the interference of the vapor on the coated pole piece inside the working box body, thereby improving the baking efficiency and heating uniformity of the coating material. And by using the heat conduction roller to perform contact heating and drying on the coated pole piece, it also plays a role in guiding the transportation of the coated pole piece, enabling the transportation process of the coated pole piece to be carried out in the vertical space dimension and to turn. Compared with the linear oven, it can reduce the floor area of the baking equipment and improve the space utilization rate.

[0041] 2. By setting up a preheating channel, the coating electrode sheet entering the working chamber can be preheated to preliminarily heat and cure the coating surface of the coating electrode sheet, thereby reducing the possibility of the coating material detaching from the coating electrode sheet during transportation and improving the production quality of the coating electrode sheet.

[0042] 3. A number of heating tubes inside the ventilation box heat the incoming air to form high-temperature hot air. After the high-temperature hot air enters the closed working chamber, it can hot air dry the coating surface of the coating electrode sheet. That is, through non-contact heat conduction, heat can be transferred from the outer layer to the inner layer of the coating material, thereby achieving simultaneous heating of the outer layer and the inner layer of the coating material and improving the baking efficiency and heating uniformity of the coating material. Description of the Drawings

[0043] Figure 1 is a schematic diagram of the overall structure of the coating electrode sheet baking equipment in an embodiment of the present application;

[0044] Figure 2 is Figure 1 a partially enlarged schematic diagram of part A after removing part of the ventilation box shell;

[0045] Figure 3 is a schematic diagram of the overall structure of the coating electrode sheet baking equipment in an embodiment of the present application after removing the traction mechanism, winding mechanism, and part of the working chamber;

[0046] Figure 4 is Figure 3 a partially enlarged schematic diagram of part B;

[0047] Figure 5 is a schematic diagram of the structure of the heat-conducting roller in an embodiment of the present application;

[0048] Figure 6 is Figure 5 a schematic cross-sectional view of the heat-conducting roller shown;

[0049] Figure 7 is a schematic diagram of the structure of the heat-conducting roller in another embodiment of the present application;

[0050] Figure 8 is a schematic diagram of the structure of the heat-conducting roller in yet another embodiment of the present application;

[0051] Figure 9 is a schematic cross-sectional view of the heat-conducting roller in yet another embodiment of the present application.

[0052] Reference numerals: 1, working box body; 2, air circulation system; 21, blower; 22, ventilation box; 23, heating tube; 24, filter channel; 25, circulation air duct; 26, NMP recovery device; 3, coating mechanism; 4, winding mechanism; 5, heat conducting roller; 6, feed inlet; 7, discharge outlet; 8, coated electrode; 9, heating device; 91, pipeline; 92, liquid storage tank; 93, pump body; 94, first circulating liquid pipe group; 95, liquid guiding hole; 96, liquid slip ring; 97, electric heating rod; 98, wire; 99, electric slip ring; 10, preheating channel; 11, explosion-proof cover; 12, chain. Detailed implementation manners

[0053] The following describes exemplary embodiments of the present application with reference to the accompanying drawings. Various details of the embodiments of the present application are included to assist understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0054] It should be noted that the terms "first", "second", etc. in the present invention are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present disclosure described herein can be implemented in an order different from those illustrated or described herein. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure.

[0055] In addition, the term "and / or" herein merely describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects unless otherwise specified.

[0056] Next, a coated electrode baking device of the present application will be described with reference to the accompanying drawings.

[0057] Refer to Figures 1 to 9, The coating electrode baking equipment includes a working box body 1, a wind circulation system 2, a coating mechanism 3, an unwinding mechanism, and a winding mechanism 4. Inside the working box body 1, a heat-conducting roller 5 is rotatably arranged. The working box body 1 is provided with a feed inlet 6 and a discharge outlet 7. The coated electrode 8 feeds in from the feed inlet 6, winds around the heat-conducting roller 5, and then discharges from the discharge outlet 7. The heat-conducting roller 5 is used to abut against one side of the coated electrode 8. Inside the heat-conducting roller 5, a heating device 9 is arranged, and the heating device 9 is used to heat the heat-conducting roller 5. The wind circulation system 2 is used to remove the liquid vapor generated in the working box body 1 when the coating material is heated. The coating mechanism 3 is used to coat the coated electrode 8. The unwinding mechanism is used to unwind the coated electrode 8. The winding mechanism 4 is used to wind the coated electrode 8. The coated electrode 8 is coated under the action of the coating mechanism 3 and is conveyed inside the working box body 1 to the heat-conducting roller 5. The heat-conducting roller 5 abuts against one side of the coated electrode 8. Under the action of the heating device 9, in a way of contact heat conduction, heat can be transferred from the inner layer to the outer layer of the coating material through the coated electrode 8, avoiding the phenomenon of false drying of the coating material. At the same time, the wind circulation system 2 removes the liquid vapor generated when the coating material is heated, continuously takes away the solvent component, so as to reduce the interference of the vapor on the coated electrode 8 inside the working box body 1, thereby improving the baking efficiency and heating uniformity of the coating material. And by using the heat-conducting roller 5 to conduct contact heating and drying on the coated electrode 8, it also plays a role in guiding the conveyance of the coated electrode 8, enabling the conveyance process of the coated electrode 8 to be carried out in the vertical space dimension and to turn. Compared with a linear oven, it can reduce the floor area of the baking equipment to improve the space utilization rate.

[0058] It should be noted that the coating mechanism 3 can adopt a roll coating form, a spraying form or an extrusion coater, and cooperate with a roller line to complete the traction conveyance of the coated electrode 8 to provide conveyance power for the coated electrode 8. The winding mechanism 4 can include a rotating roller rotatably arranged outside the working box body 1 and a driving member for driving the rotating roller to rotate. The driving member can select a motor as the driving source. Under the action of the motor, the rotating roller in a rotating state can realize the winding of the dried coated electrode 8. And an unwinding mechanism for spreading the coated electrode is externally connected at the front end of the coating mechanism 3 to continuously provide the coated electrode. The structure and principle of the unwinding mechanism are the same as those of the winding mechanism 4. And the coating mechanism 3, the winding mechanism 4 and the unwinding mechanism can all use conventional equipment on the market for operation, which is not limited here;

[0059] In this embodiment, the coating mechanism 3 is located at the position corresponding to the feed inlet 6 of the working box body 1, and the winding mechanism 4 is located at the position corresponding to the discharge outlet 7 of the working box body 1, that is, the coating mechanism 3 is located above or below the winding mechanism 4. Such a setting is to reflect that the conveyance process of the coated electrode 8 can be carried out in the vertical space dimension, and can reduce the floor area of the baking equipment to improve the space utilization rate.

[0060] In addition, in order to reduce the possibility that the coating material detaches from the coated electrode sheet 8 during transportation, as Figure 1 and Figure 3 shown, a preheating channel 10 is provided inside the working box body 1 corresponding to the feeding port 6. The preheating channel 10 is used for the coated electrode sheet 8 to pass through, and the heating device 9 is also used to heat the preheating channel 10. By setting the preheating channel 10, the coated electrode sheet 8 entering the working box body 1 can be preheated, so as to preliminarily heat and cure the coating surface of the coated electrode sheet 8, reduce the possibility that the coating material detaches from the coated electrode sheet 8 during transportation, and improve the production quality of the coated electrode sheet 8.

[0061] Among them, in one embodiment, as Figure 4 , Figure 5 and Figure 6 shown, the heating device 9 includes a plurality of pipelines 91, a liquid storage tank 92, a pump body 93, and a first circulating liquid pipe group 94. The plurality of pipelines 91 are arranged in a spiral shape on the inner side wall of the heat conducting roller 5. The liquid storage tank 92 is internally filled with a heat receiving fluid and is provided with a heating element for heating the heat receiving fluid. The first circulating liquid pipe group 94 is connected between the liquid storage tank 92 and any one of the pipelines 91. The pump body 93 is connected between the liquid storage tank 92 and the first circulating liquid pipe group 94. A complete liquid heating circulation system is formed among the liquid storage tank 92, the pipelines 91, the pump body 93, and the first circulating liquid pipe group 94. After the heat receiving fluid is heated inside the liquid storage tank 92, it is transported to the pipelines 91 through the first circulating liquid pipe group 94 under the action of the pump body 93. The pipelines 91 arranged in a spiral shape conduct heat to the outer surface of the heat conducting roller 5 through contact heat conduction, so as to achieve the heat conduction effect on the coated electrode sheet 8.

[0062] In another embodiment, as Figure 4 and Figure 7 shown, the heating device 9 includes pipelines 91, a liquid storage tank 92, a pump body 93, and a first circulating liquid pipe group 94. The heat conducting roller 5 is provided with a plurality of liquid guiding holes 95. The plurality of liquid guiding holes 95 are arranged along the circumferential direction of the heat conducting roller 5, and adjacent liquid guiding holes 95 are connected through pipelines 91. The liquid storage tank 92 is internally filled with a heat receiving fluid (not shown in the figure) and is provided with a heating element (not shown in the figure) for heating the heat receiving fluid. The first circulating liquid pipe group 94 is connected between the liquid storage tank 92 and any one of the pipelines 91. The pump body 93 is connected between the liquid storage tank 92 and the first circulating liquid pipe group 94. A complete liquid heating circulation system is formed among the liquid storage tank 92, the pipelines 91, the pump body 93, and the first circulating liquid pipe group 94. After the heat receiving fluid is heated inside the liquid storage tank 92, it is transported to the pipelines 91 through the first circulating liquid pipe group 94 under the action of the pump body 93, and then transported into each liquid guiding hole 95, so as to conduct heat to the outer surface of the heat conducting roller 5, so as to achieve the heat conduction effect on the coated electrode sheet 8.

[0063] It should be noted that in another embodiment, compared with the above embodiment, as Figure 3 and Figure 4 shown, the heating device 9 further includes a second circulating liquid pipe group (not shown in the figure). A circulating inner cavity (not shown in the figure) is provided inside the preheating channel 10. The second circulating liquid pipe group is communicatively arranged between the liquid storage tank 92 and the circulating inner cavity. After the heated fluid is heated inside the liquid storage tank 92, it will also be transported to the circulating inner cavity via the second circulating liquid pipe group under the action of the pump body 93, so that the heat in the circulating inner cavity is transferred to the inner side wall of the preheating channel 10, and then the heat is transferred to the coated electrode sheet 8 through heat conduction to achieve preliminary heating and curing. The staff can accurately adjust the heating and curing time by designing the length of the preheating channel 10, etc., which will not be elaborated here.

[0064] Furthermore, as Figure 7 shown, a liquid slip ring 96 is coaxially arranged on the heat conducting roller 5. The liquid slip ring 96 is communicatively connected between the first circulating liquid pipe group 94 and the pipeline 91. By providing the liquid slip ring 96, the problem of twisting, winding or breaking of the first circulating liquid pipe group 94 during the rotation of the heat conducting roller 5 can be avoided, which is applicable to the working conditions of pipeline transportation.

[0065] In another embodiment, as Figure 8 shown, the heating device 9 includes a plurality of electric heating rods 97. The plurality of electric heating rods 97 are all used for generating heat. The plurality of electric heating rods 97 are arranged along the circumferential direction of the heat conducting roller 5 on the inner side wall of the heat conducting roller 5. A plurality of temperature probes are arranged along the circumferential direction of the inner side wall of the heat conducting roller 5. The electric heating rods 97 can be energized to generate heat, so as to directly conduct heat to the outer surface of the heat conducting roller 5 to achieve the heat conduction effect on the coated electrode sheet 8. At the same time, by arranging a plurality of temperature probes along the circumferential direction of the heat conducting roller 5, it is convenient to monitor the temperature of each part of the heat conducting roller 5.

[0066] Furthermore, as Figure 9 shown, the plurality of electric heating rods 97 are spirally distributed on the inner side wall of the heat conducting roller 5 to increase the contact area between the electric heating rods 97 and the heat conducting roller 5, thereby improving the heat conduction efficiency.

[0067] It should be noted that in one embodiment, compared with the above embodiment, some of the electric heating rods 97 are also arranged on the inner side wall of the preheating channel 10, so that the preheating channel 10 can also directly conduct heat to the coated electrode sheet 8 through the electric heating rods 97 to achieve the heat conduction effect on the coated electrode sheet 8.

[0068] Furthermore, the electric heating rod 97 is electrically connected to an external electric box through a wire 98. A slip ring 99 is coaxially arranged on the heat-conducting roller 5. The slip ring 99 is electrically connected between the wire 98 and the external electric box. By providing the slip ring 99, problems such as distortion, entanglement, or breakage of the wire 98 during the rotation of the heat-conducting roller 5 can be avoided, which is applicable to the working condition of power wire 98 transmission.

[0069] It should be noted that the specific structures, installation methods, and working principles of the above-mentioned liquid slip ring 96 and slip ring 99 are common knowledge to those skilled in the art and will not be elaborated here.

[0070] In addition, as Figure 1 and Figure 2 shown, the air circulation system 2 includes a blower 21 and a ventilation box 22. The blower 21 is arranged outside the working box body 1, and the ventilation box 22 is communicatively arranged between the blower 21 and the working box body 1. The blower 21 cooperates with the ventilation box 22 to send external air into the working box body 1 through the ventilation box 22.

[0071] In one embodiment, a plurality of heating tubes 23 for generating heat are arranged inside the ventilation box 22. By providing the heating tubes 23, the plurality of heating tubes 23 inside the ventilation box 22 heat the incoming air through heating to form high-temperature hot air. After the high-temperature hot air enters the closed working box body 1, it can hot-air dry the coating surface of the coated electrode sheet 8. That is, through non-contact heat conduction, heat can be transferred from the outer layer to the inner layer of the coating material, thereby realizing simultaneous heating of the outer layer and the inner layer of the coating material and improving the baking efficiency and heating uniformity of the coating material.

[0072] Furthermore, the plurality of heating tubes 23 are spirally distributed inside the ventilation box 22 to increase the heating area of the heating tubes 23 and improve the heating efficiency.

[0073] Furthermore, the blower 21 is communicatively provided with a filter channel 24, and a filter net (not shown in the figure) is arranged inside the filter channel 24. By providing the filter channel 24 and the filter net, the blower 21 can be protected, the cleanliness of the gas inside the working box body 1 can be improved, and the possibility of the coated electrode sheet 8 being contaminated can be reduced.

[0074] Furthermore, the working box body 1 is provided with a circulating air duct 25. The connecting ends of the circulating air duct 25 are all connected to the working box body 1. The circulating air duct 25 is provided with an NMP recovery device 26. The NMP recovery device 26 can recover the waste gas generated during the heating process of the coating material, realize recovery and reuse, and recycle the clean gas back into the working box body 1 through the circulating air duct 25, so as to effectively reduce the pollution to the pole piece or the environment, reduce resource waste, meet the requirements of energy conservation and emission reduction, and at the same time can collect the liquid vapor generated when the coating material is heated. Among them, the NMP recovery device 26 is a device specifically used for recovering N-methylpyrrolidone (NMP). It separates NMP from waste gas or wastewater through physical and chemical methods to realize recovery and reuse. The specific structure and working principle of the NMP recovery device 26 are common knowledge in the art and will not be elaborated here.

[0075] Furthermore, in order to improve the safety performance of the equipment, an explosion-proof port (not shown in the figure) is opened at the top of the working box body 1. The explosion-proof port is covered with an explosion-proof cover 11. A chain 12 is fixedly connected between the end of the explosion-proof port and the explosion-proof cover 11. The explosion-proof cover 11 closes the explosion-proof port under the action of its own gravity. When the internal pressure is greater than the gravity of the explosion-proof cover 11, the explosion-proof cover 11 will be lifted to achieve the purpose of pressure relief, thereby improving the safety of the equipment. And a chain 12 is equipped between the explosion-proof port and the explosion-proof cover 11 to restrain the explosion-proof cover 11 and further improve the safety.

[0076] Furthermore, an air outlet channel is opened at the top of the working box body 1. The air outlet channel is provided with a valve actuator and is connected with a centrifugal fan. By setting the air outlet channel in cooperation with the valve actuator, the liquid vapor generated when the coating material is heated can be discharged in time, and at the same time, it can play a role in adjusting the internal pressure of the working box body 1. And by equipping a centrifugal fan, it can play a role in quickly relieving pressure when necessary.

[0077] The implementation principle of a coating electrode baking device according to an embodiment of the present application is as follows: during operation, the coated electrode 8 is coated under the action of the coating mechanism 3, and after being preliminarily heated and cured through the preheating channel 10 at the feed port 6, it is transported to the heat conduction roller 5 inside the working box 1. The heat conduction roller 5 abuts against one side of the coated electrode 8 and guides the coated electrode 8 to be transported towards the discharge port 7. Under the action of the heating device 9, heat is transferred from the inner layer to the outer layer of the coating material through the coated electrode 8 by means of contact heat conduction. At the same time, the blower 21 cooperates with a number of heating tubes 23 to send high-temperature hot air into the working box 1 through the ventilation box 22, realizing the operation of hot air drying the coating surface of the coated electrode 8. In this way, heat is transferred from the outer layer to the inner layer of the coating material through non-contact heat conduction, so as to simultaneously heat the outer layer and the inner layer of the coating material, improve the baking efficiency and heating uniformity of the coating material. In addition, by using the heat conduction roller 5 to conduct contact heating and drying on the coated electrode 8, it also plays a role in guiding the transportation of the coated electrode 8, enabling the transportation process of the coated electrode 8 to be carried out in the vertical space dimension and to turn. Compared with a linear oven, it can reduce the floor area of the baking device and improve the space utilization rate.

[0078] The above specific implementation manners do not constitute a limitation to the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A coating electrode baking device, characterized in that Including: A working box body (1), inside which a heat-conducting roller (5) is rotatably arranged. The working box body (1) is provided with a feeding port (6) and a discharging port (7). The coating electrode sheet (8) is fed through the feeding port (6) and wound around the heat-conducting roller (5), and then discharged from the discharging port (7). The heat-conducting roller (5) is used to abut against one side of the coating electrode sheet (8). A heating device (9) is arranged inside the heat-conducting roller (5), and the heating device (9) is used to heat the heat-conducting roller (5); A wind circulation system (2), which is used to remove the liquid vapor generated in the working box body (1) when the coating material is heated; A coating mechanism (3), which is used to coat the coating electrode sheet (8); A unwinding mechanism, which is used to unwind the coating electrode sheet (8); A winding mechanism (4), which is used to wind the coating electrode sheet (8).

2. The coating electrode baking equipment according to claim 1, characterized in that A preheating channel (10) is arranged inside the working box body (1) corresponding to the feeding port (6). The preheating channel (10) is used for the coating electrode sheet (8) to pass through, and the heating device (9) is used to heat the preheating channel (10).

3. The coating pole piece baking device according to claim 1, characterized in that, The heating device (9) includes a plurality of pipelines (91), a liquid storage tank (92), a pump body (93), and a first circulating liquid pipe group (94). The plurality of pipelines (91) are arranged in a spiral shape on the inner side wall of the heat-conducting roller (5). The liquid storage tank (92) is filled with a heated fluid and is provided with a heating element for heating the heated fluid. The first circulating liquid pipe group (94) is connected between the liquid storage tank (92) and any one of the pipelines (91), and the pump body (93) is connected between the liquid storage tank (92) and the first circulating liquid pipe group (94).

4. A coating electrode baking device according to claim 1, characterized in that, The heating device (9) includes a plurality of pipelines (91), a liquid storage tank (92), a pump body (93), and a first circulating liquid pipe group (94). The heat-conducting roller (5) is provided with a plurality of liquid guide holes (95). The plurality of liquid guide holes (95) are arranged along the circumferential direction of the heat-conducting roller (5). Adjacent liquid guide holes (95) are connected through the pipelines (91). The liquid storage tank (92) is filled with a heated fluid and is provided with a heating element for heating the heated fluid. The first circulating liquid pipe group (94) is connected between the liquid storage tank (92) and any one of the pipelines (91), and the pump body (93) is connected between the liquid storage tank (92) and the first circulating liquid pipe group (94).

5. The coating pole piece baking equipment according to claim 3 or 4, characterized in that A liquid slip ring (96) is coaxially arranged on the heat-conducting roller (5), and the liquid slip ring (96) is connected between the first circulating liquid pipe group (94) and the pipelines (91).

6. The coating electrode baking equipment according to claim 1, characterized in that, The heating device (9) includes a plurality of electric heating rods (97), and all of the plurality of electric heating rods (97) are used for generating heat. The plurality of electric heating rods (97) are arranged along the circumferential direction of the heat-conducting roller (5) on the inner side wall of the heat-conducting roller (5). A plurality of temperature probes are arranged along the circumferential direction of the inner side wall of the heat-conducting roller (5).

7. The coating electrode baking device according to claim 6, characterized in that, The plurality of electric heating rods (97) are arranged in a spiral distribution on the inner side wall of the heat-conducting roller (5).

8. The coating pole piece baking equipment according to claim 6, characterized in that The electric heating rod (97) is electrically connected to an external electric box through a wire (98). A slip ring (99) is coaxially arranged on the heat-conducting roller (5), and the slip ring (99) is electrically connected between the wire (98) and the external electric box.

9. The coating pole piece baking equipment according to claim 1, characterized in that, The air circulation system includes a blower (21) and a ventilation box (22). The blower (21) is arranged outside the working box body (1), and the ventilation box (22) is communicatively connected between the blower (21) and the working box body (1).

10. A coating electrode baking device as described in claim 9, characterized in that, A plurality of heating tubes (23) for generating heat are arranged inside the ventilation box (22).

11. A coating electrode baking device as described in claim 10, characterized in that, The plurality of heating tubes (23) are arranged in a spiral distribution inside the ventilation box (22).

12. The coating electrode baking equipment according to claim 9, characterized in that, The blower (21) is communicatively connected with a filter channel (24), and a filter screen is arranged inside the filter channel (24).

13. A coating electrode baking device according to claim 9, characterized in that, The working box body (1) is provided with a circulating air duct (25). The communicating ends of the circulating air duct (25) are all communicatively connected to the working box body (1), and the circulating air duct (25) is provided with an NMP recovery device (26).

14. The coating electrode baking equipment according to claim 1, characterized in that, An explosion-proof port is opened at the top of the working box body (1). The explosion-proof port is covered with an explosion-proof cover (11), and a chain (12) is fixedly connected between the end of the explosion-proof port and the explosion-proof cover (11).

15. The coating electrode baking equipment according to claim 1, characterized in that, An air outlet channel (13) is opened at the top of the working box body (1). An air valve actuator (14) is arranged on the air outlet channel (13), and a centrifugal fan (15) is communicatively connected to the air outlet channel (13).

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