Drying device and battery production equipment

Abstract

The utility model provides a drying device and battery production equipment, the drying device comprises a drying module, the drying module comprises a drying oven and a circulation system, the drying oven is provided with a drying cavity, a first inlet and a first outlet, the first inlet and the first outlet are communicated with the drying cavity, and the circulation system is connected with the first inlet and the first outlet to form a closed circulation loop; the circulating system comprises a recovery assembly and a heating source which are connected, the input end of the recovery assembly is connected with the first outlet and is configured to remove a liquid medium in the first fluid discharged by the first outlet to form a second fluid, and the heating source is connected with the output end of the recovery assembly and the first inlet; the heater is configured to heat a second fluid and input the second fluid into the first inlet. According to the drying device and the battery production equipment, energy consumption can be reduced, and the production cost of batteries can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a drying device and battery production equipment. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the manufacturing process of batteries, a drying device is required to dry the pole pieces or battery pole pieces to control the moisture in the battery pole pieces. However, the current drying device has high energy consumption, which increases the production cost of the battery. Therefore, how to reduce the energy consumption of the drying device has become an urgent problem to be solved. Utility Model Content

[0004] In view of the above problems, the present application provides a drying device and battery production equipment, which can reduce energy consumption and lower the production cost of batteries.

[0005] In the first aspect, the present application provides a drying device, including a drying module, the drying module including an oven and a circulation system, the oven having a drying chamber and a first inlet and a first outlet connected to the drying chamber, the circulation system being connected to the first inlet and the first outlet to form a closed-loop circulation circuit, the circulation system including a connected recovery component and a heating source, the input end of the recovery component being connected to the first outlet and being configured to remove the liquid medium in the first fluid discharged from the first outlet to form a second fluid, the heating source being connected to the output end of the recovery component and the first inlet, and being configured to heat the second fluid and input the second fluid into the first inlet.

[0006] In the embodiment of the present application, by setting up a circulation system, the exhaust air of the oven, that is, the first fluid discharged from the first outlet can be recycled and reintroduced into the oven, so that a closed-loop circulation circuit is formed in the circulation system and the oven, thereby eliminating the need to introduce air from the external environment, reducing energy consumption, and the exhaust air will not be discharged to the external environment. Therefore, compared with the drying device in the related art, the exhaust air processing system can be omitted, thereby reducing the production cost of the battery.

[0007] In some embodiments, the circulation system also includes a heat exchanger, which includes a first flow channel and a second flow channel. The first flow channel connects the first outlet and the input end of the recovery component, and the second flow channel connects the output end of the recovery component and the heating source, and the first fluid and the second fluid perform heat exchange.

[0008] In the embodiment of the present application, by setting up a heat exchanger, on the one hand, the first fluid in the first flow channel can be cooled by heat exchange, which is more convenient for recovering the liquid medium therein; on the other hand, the second fluid can be preheated by heat exchange and temperature increase before the second fluid is output to the heating source, thereby making it easier for the heating source to heat the second fluid to the target temperature and further reducing energy consumption.

[0009] In some embodiments, the number of heating sources is more than two, and the second fluid formed by the recovery component can be diverted and input to the first inlet through each heating source, which can achieve diversion heating of the second fluid, increase the heating speed, and achieve uniform heating of the second fluid, thereby improving the drying effect of the battery electrodes in the oven.

[0010] In some embodiments, the number of ovens is more than two, and the first outlets of each oven are connected to the input end of the recovery component after converging. The first inlet of each oven is correspondingly provided with a heating source, and the second fluid formed by the recovery component can be diverted and input to the corresponding first inlet through the heating source.

[0011] In the embodiment of the present application, the same recovery component can be used to process the first fluid discharged from the first outlet of each oven, and the treated second fluid is diverted and heated by each heating source and then introduced into the corresponding oven, thereby reducing costs, increasing heating speed, and improving production efficiency.

[0012] In some embodiments, the drying device also includes a connecting component, which includes a second inlet and a second outlet connected to the connecting cavity. The connecting component is connected to the drying module through the second inlet and is connected to the external environment through the second outlet. This can reduce the risk of pressure loss caused by abnormal circulation of the drying module and improve the reliability of the drying module.

[0013] In some embodiments, the drying module includes a first negative pressure generator, which is located in the closed-loop circulation circuit and is used to form a negative pressure environment in the closed-loop circulation circuit to further reduce the risk of the fluid medium in the drying module being discharged to the external environment.

[0014] In some embodiments, the connecting component further includes a third inlet and a second negative pressure generator, the third inlet is connected to the external environment, and the second negative pressure generator is located in the connecting cavity and is used to form a negative pressure environment in the connecting cavity.

[0015] In the embodiment of the present application, during the operation of the drying device, the negative pressure in the connecting chamber can be equal to the negative pressure in the first negative pressure generator, and the fluid medium in the connecting chamber and the fluid medium in the drying module form two independent flow channels. In the connecting chamber, air from the external environment enters from the third inlet and flows out from the second outlet. In the drying module, the fluid medium flows in the closed-loop circulation circuit formed by the circulation system and the oven, so that the air from the external environment will not enter the oven, thereby reducing the risk of the fluid medium in the drying module being discharged to the external environment and achieving extremely low energy consumption.

[0016] In some embodiments, the drying device also includes a controller, and pressure gauges are respectively provided in the drying module and the connecting component, and the pressure gauges are used to detect the pressure parameters of the closed-loop circulation circuit and the connecting cavity. The controller is configured to adjust the first negative pressure generator and the second negative pressure generator respectively according to the pressure parameters, so as to more reliably control the negative pressure in the closed-loop circulation circuit and the pressure in the connecting cavity to remain consistent.

[0017] In some embodiments, in the drying module, the first negative pressure generator is arranged at the first outlet, and the pressure gauge is located in the oven and arranged close to the first outlet, which can more quickly reflect the changes in the negative pressure in the closed-loop circulation circuit and improve the regulation efficiency.

[0018] In some embodiments, the drying device also includes an air volume regulating valve arranged at the second inlet and / or the third inlet; the connecting component also includes a concentration detection element, which is arranged in the connecting cavity, and the concentration detection element is used to detect the concentration of the liquid medium in the third fluid discharged at the second outlet. The controller is configured to adjust at least one of the air volume regulating valve, the first negative pressure generator, and the second negative pressure generator according to the concentration of the liquid medium.

[0019] In an embodiment of the present application, the third fluid includes a portion of the second fluid and a portion of the air in the external environment. By arranging a concentration detection component in the connecting cavity, the concentration of the liquid medium in the third fluid discharged from the second outlet to the external environment can be monitored in real time. If the concentration of the liquid medium in the third fluid is relatively large, the air volume ratio between the second inlet and the third inlet can be controlled by adjusting the air volume regulating valve and / or the negative pressure to reduce the air volume of the second fluid and / or increase the air volume of the external environment air, so that the third fluid at the second outlet can meet the external discharge requirements.

[0020] In some embodiments, in a closed-loop circulation circuit, the second inlet is connected to the downstream of the recovery component. Since the fluid medium downstream of the recovery component is recycled by the recovery component, the concentration of the liquid medium in the fluid medium is relatively small, thereby further reducing the risk of the fluid medium in the drying module being discharged to the external environment and improving the reliability of the drying device.

[0021] In a second aspect, an embodiment of the present application provides a battery production device, comprising the drying device of the first aspect.

[0022] According to the drying device of the embodiment of the present application, the circulation system is connected to the oven, and the circulation system includes a recovery component and a heating source. The first fluid discharged from the first outlet of the oven will be input into the recovery component. The recovery component removes the liquid medium volatilized by the material to be dried in the first fluid to form a second fluid. The second fluid will be heated to the target temperature by the heating source and then introduced into the first inlet of the oven again, so that the circulation system and the oven form a closed-loop circulation circuit, and there is no need to introduce air from the external environment to participate in the circulation, thereby reducing energy consumption. In addition, the first fluid does not need to be discharged to the external environment, so compared with the drying device in the related art, the exhaust treatment system can also be omitted, reducing the production cost of the battery.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 is a schematic diagram of the structure of a drying device provided in some embodiments of the present application;

[0026] Figure 2 It is a schematic diagram of the structure of a drying device provided in other embodiments of the present application.

[0027] The reference numerals in the specific implementation manner are as follows:

[0028] 100 drying devices, 200 battery electrodes;

[0029] 10 drying module, 20 connecting components;

[0030] 1 oven, 11 first inlet, 111 sub-inlet, 12 first outlet, 2 recovery component, 3 heating source, 4 heat exchanger, 5 first negative pressure generator, 6 connecting pipe, 61 second inlet, 62 second outlet, 63 third inlet, 7 second negative pressure generator, 8 pressure gauge, 9 concentration detection component. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0032] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0033] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0034] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0035] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0038] During the production of batteries, it is necessary to dry the coated battery pole pieces. At present, in the drying device of the related art, during its operation, at least part of the air from the external environment is introduced into the oven to serve as a drying medium to dry the battery pole pieces arranged in the oven. However, due to the low temperature of the air in the external environment, the above drying method consumes a lot of energy.

[0039] In order to solve the above technical problems, an embodiment of the present application provides a new drying device. By setting up a circulation system, the exhaust air of the oven can be recovered and processed and then reintroduced into the oven, so that the circulation system and the oven form a closed-loop circulation circuit. There is no need to introduce air from the external environment to participate in the circulation, thereby reducing energy consumption.

[0040] It can be understood that the drying device provided in the embodiments of the present application can be used for drying battery electrodes, especially in the field of battery production technology. The following embodiments of the present application only take the drying of battery electrodes as an example for illustration, but the application of the drying device in the embodiments of the present application is not limited to the following embodiments, and can also be used for drying other materials.

[0041] The battery mentioned in the embodiments of the present application can be used as a power source in an electric device, which can be, but not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0042] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery cell refers to the smallest unit that constitutes the battery. The battery generally also includes a battery box for encapsulating one or more battery cells. The battery box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0043] Optionally, the battery cell may be a secondary battery or a primary battery, wherein a secondary battery refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged. Battery cells include, but are not limited to, lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, and the like.

[0044] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes, but is not limited thereto. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries, such as hexagonal prismatic batteries.

[0045] Among them, the battery cell includes an electrode assembly and an electrolyte, the electrode assembly is composed of a battery electrode sheet and a separator, the battery electrode sheet includes a positive electrode sheet and a negative electrode sheet, and the battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0046] The pole piece mentioned in the embodiment of the present application includes a current collector and an active material layer coated on the surface of the current collector, the active material layer is coated on a partial area of ​​the current collector, the area of ​​the current collector coated with the active material layer protrudes from the area not coated with the active material layer, and the area of ​​the current collector not coated with the active material layer serves as the pole lug of the battery pole piece. The battery pole piece can be a positive pole piece or a negative pole piece. If the battery pole piece is a positive pole piece, the positive pole piece includes a positive current collector and a positive active material layer, the positive active material layer is coated on the surface of the positive current collector, the area of ​​the positive current collector coated with the positive active material layer protrudes from the area not coated with the positive active material layer, and the positive current collector not coated with the positive active material layer serves as the positive pole lug. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. If the battery electrode is a negative electrode, the negative electrode includes a negative current collector and a negative active material layer, the negative active material layer is coated on the surface of the negative current collector, the area of ​​the negative current collector coated with the negative active material layer protrudes from the area not coated with the negative active material layer, and the negative current collector not coated with the negative active material layer serves as the negative electrode tab. The material of the negative current collector may be copper, and the negative active material may be carbon or silicon, etc.

[0047] During the battery production process, the active material needs to be coated on the surface of the current collector and then dried to remove moisture from the active material layer.

[0048] According to some embodiments of the present application, the present application provides a battery production equipment, including a coating device and a drying device, wherein the drying device is arranged downstream of the coating device, the coating device is used to coat the active material layer on the current collector, and the drying device is used to dry the electrode sheet so that the liquid medium in the active material of the electrode sheet can be volatilized to remove the moisture in the active material layer and realize the preparation of the electrode sheet.

[0049] See also Figure 1 The drying device 100 in the embodiment of the present application includes a drying module 10, the drying module 10 includes an oven 1 and a circulation system, the oven 1 has a drying chamber and a first inlet 11 and a first outlet 12 connected to the drying chamber, the circulation system is connected to the first inlet 11 and the first outlet 12 to form a closed-loop circulation circuit, the circulation system includes a connected recovery component 2 and a heating source 3, the input end of the recovery component 2 is connected to the first outlet 12 and is configured to remove the liquid medium in the first fluid discharged from the first outlet 12 to form a second fluid, the heating source 3 is connected to the output end of the recovery component 2 and the first inlet 11, and is configured to heat the second fluid and input the second fluid into the first inlet 11.

[0050] The drying device 100 in the embodiment of the present application connects the circulation system to the oven 1. The circulation system includes a recovery component 2 and a heating source 3. The first fluid discharged from the first outlet 12 of the oven 1 will be input into the recovery component 2. The recovery component 2 removes the liquid medium in the first fluid to form a second fluid. The second fluid will be heated to the target temperature by the heating source 3 and then introduced into the first inlet 11 of the oven 1 again, thereby forming a closed-loop circulation circuit. There is no need to introduce air from the external environment to participate in the circulation, thereby reducing energy consumption. In addition, the first fluid does not need to be discharged to the external environment, so the processing system of the first fluid can also be omitted, thereby reducing the production cost of the battery.

[0051] It can be understood that the first fluid and the second fluid can be collectively referred to as fluid medium, and the closed-loop circulation circuit refers to a full internal circulation circuit formed by the fluid medium between the circulation system and the oven 1. Since the first fluid discharged from the oven 1 will carry the heat in the oven 1, the closed loop is achieved by recycling the first fluid and then completely introducing it into the oven 1, which can fully utilize the heat in the oven 1 and achieve extremely low energy consumption. Optionally, the oven 1 is a hollow shell structure with a drying chamber for drying the electrode, and the oven 1 includes but is not limited to a cubic shape, a cylindrical shape, etc.

[0052] The recovery component 2 includes but is not limited to a separator and an adsorber, etc. Taking the recovery component 2 as an example of a separator, after the first fluid of the first outlet 12 of the oven 1 is input into the separator, based on the density difference between the gas in the first fluid and the liquid medium mixed in the gas, the liquid medium in the first fluid can be removed and output from the separator as the second fluid. According to different separation requirements and working conditions, the separator can be separated by gravity sedimentation, baffle separation, centrifugal separation and other methods.

[0053] It should be noted that the second fluid refers to a fluid medium having a lower liquid medium content than the first fluid, that is, after being processed by the recovery component 2, a small amount of liquid medium may still exist in the second fluid, but it can meet the drying requirements of the battery pole pieces 200 in the oven 1.

[0054] Since the first fluid will be cooled after being processed by the recovery component 2, the second fluid can be introduced into the heating source 3 to heat the second fluid to the target temperature to meet the drying requirements of the battery electrode 200 in the oven 1. The heating source 3 can be a fresh air heat exchanger, and the heating source 3 can use electric heating or steam heating to heat the second fluid to the target temperature.

[0055] Optionally, the recovery component 2, the heating source 3 and the oven 1 can be connected by a pipeline. For example, the first outlet 12 of the oven 1 and the input end of the recovery component 2, the output end of the recovery component 2 and the heating source 3, and the heating source 3 and the first inlet 11 of the oven 1 can all be connected by a pipeline to form a closed-loop circulation circuit.

[0056] See also Figure 1 In some optional embodiments, the circulation system also includes a heat exchanger 4, the heat exchanger 4 includes a first flow channel and a second flow channel, the first flow channel connects the first outlet 12 and the input end of the recovery component 2, the second flow channel connects the output end of the recovery component 2 and the heating source 3, and the first fluid and the second fluid perform heat exchange.

[0057] Since the first fluid will be cooled after being processed into the second fluid by the recovery component 2, there is a temperature difference between the input end and the output end of the fluid medium at the recovery component 2. By setting up the heat exchanger 4, the temperature difference between the first fluid and the second fluid can be utilized. On the one hand, the first fluid in the first flow channel can be cooled by heat exchange, which is more convenient for recovering the liquid medium therein. On the other hand, before the second fluid is output to the heating source 3, the second fluid can be heated by heat exchange to achieve preheating of the second fluid, so that it is more convenient for the heating source 3 to heat the second fluid to the target temperature, further reducing energy consumption.

[0058] Optionally, the heat exchanger 4 may be a partition-type heat exchanger, and includes but is not limited to at least one of a tube heat exchanger, a plate heat exchanger, and a fin heat exchanger in the partition-type heat exchanger.

[0059] In some optional embodiments, the number of the heating sources 3 is more than two, and the second fluid formed by the recovery component 2 can be split and input to the first inlet 11 through each heating source 3. By providing more than two heating sources 3, the second fluid can be heated by split flow, the heating speed can be increased, and the second fluid can be heated uniformly, thereby improving the drying effect of the battery electrode 200 in the oven 1.

[0060] Optionally, the first inlet 11 includes at least two sub-inlets 111, each sub-inlet 111 may be correspondingly provided with a heating source 3, and the heated second fluid may be introduced into different areas of the oven 1 through at least two sub-inlets 111 respectively to achieve uniform drying of the battery electrodes 200 in the oven 1.

[0061] In some optional embodiments, the number of ovens 1 is more than two, the first outlets 12 of each oven 1 are connected to the input end of the recovery component 2 after confluence, the first inlet 11 of each oven 1 is correspondingly provided with a heating source 3, and the second fluid formed by the recovery component 2 can be diverted and input to the corresponding first inlet 11 through each heating source 3.

[0062] For the drying device 100, more than two ovens 1 may be arranged therein, and the multiple ovens 1 are stacked in layers. The first outlets 12 of the two or more ovens 1 are connected to the input end of the recovery component 2 after converging, that is, the first fluids of the first outlets 12 enter the input end of the recovery component 2 after converging, so that the first fluids of each oven 1 are processed by the same recovery component 2, and the second fluids at the output end of the recovery component 2 will be split and input to each heating source 3 to the first inlet 11 of the corresponding oven 1, thereby realizing the split heating of the second fluid introduced into each oven 1, improving the heating speed, and improving the drying effect.

[0063] See also Figure 2 In some optional embodiments, the drying device 100 also includes a connecting component 20, the connecting component 20 includes a second inlet 61 and a second outlet 62 that are connected to the connecting cavity, the connecting component 20 is connected to the drying module 10 through the second inlet 61, and is connected to the external environment through the second outlet 62.

[0064] It is understandable that during the operation of the drying device 100, the medium in the closed-loop circulation circuit will not enter the connecting cavity. By providing a connecting component 20 to connect the drying module 10 with the external environment, the risk of pressure loss caused by abnormal circulation of the drying module 10 can be reduced, thereby improving the reliability of the drying module 10.

[0065] When the drying module 10 is connected to the external environment through the connecting component 20, considering that there may be a situation where the fluid medium of the drying module 10 is discharged to the external environment through the second inlet 61, in some optional embodiments, the drying module 10 includes a first negative pressure generator 5, which is located in the closed-loop circulation circuit and is used to form a negative pressure environment in the closed-loop circulation circuit to reduce the risk of the fluid medium in the drying module 10 being discharged to the external environment.

[0066] Optionally, the negative pressure environment in the closed-loop circulation loop is a micro-negative pressure, for example, the negative pressure range is between -5 Pa and -10 Pa. The first negative pressure generator 5 can be set as a fan, which controls the flow rate of the fluid medium in the closed-loop circulation loop to form a micro-negative pressure environment in the closed-loop circulation loop.

[0067] Optionally, when the first negative pressure generator 5 is set as a fan, the number of fans can be set to one or more than two. Taking two fans as an example, one of the fans can be set between the first outlet 12 of the oven 1 and the input end of the recovery component 2, and the other fan can be set between the output end of the recovery component 2 and the heating source 3.

[0068] See also Figure 2 In some optional embodiments, the connecting component 20 further includes a third inlet 63 and a second negative pressure generator 7, the third inlet 63 is connected to the external environment, and the second negative pressure generator 7 is located in the connecting cavity and is used to form a negative pressure environment in the connecting cavity.

[0069] By arranging a third inlet 63 and a second negative pressure generator 7 in the connecting component 20, a negative pressure environment can also be formed in the connecting cavity. Moreover, during the operation of the drying device 100, the negative pressure in the connecting cavity can be equal to the negative pressure in the closed-loop circulation circuit, so as to form a stable closed-loop circulation circuit in the drying module 10.

[0070] It can be understood that when the negative pressure in the connecting cavity is equal to the negative pressure in the closed-loop circulation circuit, the fluid medium in the connecting cavity and the fluid medium in the drying module 10 form two independent flow channels. In the connecting cavity, air from the external environment enters from the third inlet 63 and flows out from the second outlet 62. In the drying module 10, the fluid medium flows in the closed-loop circulation circuit formed by the circulation system and the oven 1, so that the air from the external environment will not enter the oven 1, thereby reducing the risk of the fluid medium in the drying module 10 being discharged to the external environment and achieving extremely low energy consumption.

[0071] Optionally, the second negative pressure generator 7 may be configured as a fan to form a negative pressure environment in the communicating cavity by controlling the flow rate of the fluid medium in the communicating cavity.

[0072] In some optional embodiments, the drying device 100 also includes a controller, and pressure gauges 8 are respectively provided in the drying module 10 and the connecting component 20, and the pressure gauges 8 are used to detect the pressure parameters of the closed-loop circulation circuit and the connecting cavity. The controller is configured to adjust the first negative pressure generator 5 and the second negative pressure generator 7 respectively according to the pressure parameters.

[0073] By arranging a pressure gauge 8 and a controller in the drying device 100, the pressure gauge 8 can be used to monitor the negative pressure in the closed-loop circulation circuit and the connecting cavity in real time, thereby more reliably controlling the negative pressure in the closed-loop circulation circuit and the pressure in the connecting cavity to remain consistent.

[0074] In some optional embodiments, in the drying module 10, the first negative pressure generator 5 is arranged at the first outlet 12, and the pressure gauge 8 is located in the oven 1 and arranged close to the first outlet 12. The space in the oven 1 can be utilized, which is more convenient for setting the pressure gauge 8. By setting the pressure gauge 8 close to the first negative pressure generator 5, the changes in the negative pressure in the closed-loop circulation circuit can be reflected more quickly, thereby improving the regulation efficiency.

[0075] It is understandable that when there are more than two ovens 1, the first negative pressure generator 5 can be arranged at the confluence of the first outlets 12 of each oven 1, so as to control the pressure in each oven 1. Optionally, in actual use, the above-mentioned connecting component 20 can be connected only to the first oven section and the last oven section, so that the pressure gauge 8 is only arranged in the first oven section and the last oven section to realize the negative pressure control in the first oven section and the last oven section, thereby simplifying the adjustment steps.

[0076] In some optional embodiments, in a closed-loop circulation circuit, the second inlet 61 is connected to the downstream of the recovery component 2. Since the fluid medium downstream of the recovery component 2 is recycled by the recovery component 2, the liquid medium content in the fluid medium is relatively small, thereby further reducing the risk of the fluid medium in the drying module 10 being discharged to the external environment, thereby improving the reliability of the drying device 100.

[0077] When there are more than two ovens 1, since the connecting component 20 is connected between the first section oven and the last section oven, the second inlet 61 can be connected between the heating source 3 and the first inlet 11 corresponding to the first section oven and the last section oven to realize the setting of the connecting component.

[0078] Optionally, in the connecting component 20 , the second negative pressure generator 7 is disposed at the second outlet 62 , and the pressure gauge 8 is located in the connecting cavity and is disposed close to the second outlet 62 .

[0079] In some optional embodiments, the drying device 100 also includes an air volume regulating valve arranged at the second inlet 61 and / or the third inlet 63, and the connecting component 20 also includes a concentration detection component 9, which is arranged in the connecting cavity. The concentration detection component 9 is used to detect the concentration of the liquid medium in the third fluid discharged from the second outlet 62, and the controller is configured to adjust at least one of the air volume regulating valve, the first negative pressure generator 5 and the second negative pressure generator 7 according to the concentration of the liquid medium.

[0080] It can be understood that the third fluid includes part of the second fluid and part of the air in the external environment. By arranging a concentration detection component 9 in the connecting cavity, the concentration of the liquid medium in the third fluid discharged from the second outlet 62 to the external environment can be monitored in real time. If the concentration of the liquid medium in the third fluid is high, the air volume ratio of the second inlet 61 and the third inlet 63 can be controlled by adjusting the air volume regulating valve and / or negative pressure to reduce the air volume of the second fluid and / or increase the air volume of the external environment air, so as to reduce the concentration of the liquid medium in the third fluid, so that the third fluid at the second outlet 62 can meet the external discharge requirements.

[0081] Taking the air volume regulating valve for adjusting the third inlet 63 as an example, when the circulation abnormality in the closed-loop circulation circuit causes the concentration of the liquid medium in the fluid medium to exceed the threshold value, the air volume regulating valve can be adjusted to increase the air intake of the third inlet 63, thereby diluting the concentration of the liquid medium in the third fluid so that the third fluid can meet the external discharge requirements.

[0082] Optionally, the concentration detection element 9 may be a gas content detector.

[0083] Optionally, the connecting component 20 includes a connecting tube 6 formed with a connecting cavity, the connecting tube 6 has a preset length, and along the length direction of the connecting tube 6, one end of the connecting tube 6 is provided with a second inlet 61 and a third inlet 63, and the other end of the connecting tube 6 is provided with a second outlet 62. The concentration detection component 9, the pressure gauge 8 and the second negative pressure sensor are arranged between the third inlet 63 and the second outlet 62, so as to facilitate the monitoring of the third fluid in the second outlet 62.

[0084] See also Figure 1 and Figure 2 , the following takes a drying device 100 in a specific embodiment as an example to illustrate the specific structure and working principle of the drying device 100 in the embodiment of the present application.

[0085] Specifically, the drying device 100 includes a drying module 10 and a connecting component 20. The drying module 10 includes more than two ovens 1 and a circulation system. Each oven 1 forms a closed-loop circulation circuit with the circulation system. The connecting component 20 is connected to the first section oven and the last section oven. The connecting component 20 includes a second inlet 61, a third inlet 63 and a second outlet 62. The second inlet 61 is connected to the oven 1. During the operation of the drying device 100, the negative pressure in the connecting cavity of the connecting component 20 and the closed-loop circulation circuit is the same and forms two independent flow channels.

[0086] In the communication cavity, air from the external environment enters from the third inlet 63 and flows out from the second outlet 62 .

[0087] In the closed-loop circulation circuit, the first fluids at the first outlets 12 of each oven 1 will converge and then pass through the heat exchanger 4 for cooling and then enter the input end of the recovery component 2. The recovery component 2 is used to remove the liquid medium in the first fluid and form a second fluid. The second fluid is heated by the heat exchanger 4 and then diverted. After being heated by each heating source 3 in the diversion branch, it is introduced into the first inlet 11 of the corresponding oven 1, forming a closed-loop circulation circuit to dry the battery electrode 200 in the oven 1.

[0088] The drying device 100 in the embodiment of the present application can form a closed-loop circulation circuit with the circulation system and the oven 1, and no air from the external environment needs to be introduced to participate in the circulation, thereby reducing energy consumption. In addition, the device has high reliability and is more convenient for promotion and application.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A drying device, characterized in that: It includes a drying module, and the drying module includes: A drying oven having a drying chamber and a first inlet and a first outlet communicating with the drying chamber; A circulation system is connected to the first inlet and the first outlet to form a closed-loop circulation circuit, the circulation system includes a connected recovery component and a heating source, the input end of the recovery component is connected to the first outlet and is configured to remove the liquid medium in the first fluid discharged from the first outlet to form a second fluid, the heating source is connected to the output end of the recovery component and the first inlet, and is configured to heat the second fluid and input the second fluid into the first inlet.

2. The drying device according to claim 1, characterized in that: The circulation system also includes a heat exchanger, which includes a first flow channel and a second flow channel. The first flow channel connects the first outlet and the input end of the recovery component, and the second flow channel connects the output end of the recovery component and the heating source. The first fluid and the second fluid perform heat exchange.

3. The drying device according to claim 1, characterized in that: The number of the heating sources is more than two, and the second fluid formed by the recovery component can be split and input to the first inlet through each of the heating sources.

4. The drying device according to claim 1, characterized in that: The number of the ovens is more than two, the first outlets of the ovens are connected to the input end of the recovery component after confluence, the first inlet of each oven is correspondingly provided with the heating source, and the second fluid formed by the recovery component can be diverted and input to the corresponding first inlet through the heating source.

5. The drying device according to any one of claims 1 to 4, characterized in that: The drying device further includes a connecting component, which includes a connecting cavity and a second inlet and a second outlet connected to the connecting cavity. The connecting component is connected to the drying module through the second inlet and is connected to the external environment through the second outlet.

6. The drying device according to claim 5, characterized in that: The drying module comprises a first negative pressure generator, which is located in the closed-loop circulation circuit and is used to form a negative pressure environment in the closed-loop circulation circuit.

7. The drying device according to claim 6, characterized in that: The communication component further includes a third inlet and a second negative pressure generator, wherein the third inlet is connected to the external environment, and the second negative pressure generator is located in the communication cavity and is used to form a negative pressure environment in the communication cavity.

8. The drying device according to claim 7, characterized in that: The drying device also includes a controller. The drying module and the connecting component are respectively provided with pressure gauges. The pressure gauges are used to detect the pressure parameters of the closed-loop circulation circuit and the connecting cavity. The controller is configured to adjust the first negative pressure generator and the second negative pressure generator respectively according to the pressure parameters.

9. The drying device according to claim 8, characterized in that: In the drying module, the first negative pressure generator is disposed at the first outlet, and the pressure gauge is located in the oven and is disposed close to the first outlet.

10. The drying device according to claim 8, characterized in that: The drying device further comprises an air volume regulating valve arranged at the second inlet and / or the third inlet; The connecting component also includes a concentration detecting member, which is arranged in the connecting cavity, and is used to detect the concentration of the liquid medium in the third fluid discharged from the second outlet. The controller is configured to adjust at least one of the air volume regulating valve, the first negative pressure generator and the second negative pressure generator according to the concentration of the liquid medium.

11. The drying device according to claim 5, characterized in that: In the closed-loop circulation circuit, the second inlet is connected downstream of the recovery component.

12. A battery production device, characterized in that: It comprises a drying device as described in any one of claims 1 to 11.

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