Circulating air system of drying device for coating lithium battery diaphragm

Abstract

The utility model discloses a circulating air system of a drying device for coating a lithium battery diaphragm, relates to the technical field of indoor cleaning, and can solve the problem of high energy consumption of the drying device in the prior art. The circulating air system of the drying device for coating the lithium battery diaphragm comprises a plurality of drying ovens with drying cavities, a heat pump for heating air, and an air inlet pipeline and an air outlet pipeline which are communicated with the drying cavities, the ends, away from the drying cavity, of the air inlet pipeline and the air outlet pipeline communicate with the air outlet end and the air inlet end of the heat pump correspondingly. The air return pipe is respectively communicated with the air inlet pipeline and the air outlet pipeline, and the flow regulating valves are arranged on the air inlet pipeline and the air outlet pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery diaphragm manufacturing, in particular to a circulating air system of a drying device for lithium battery diaphragm coating. Background Art

[0002] In the coating system of lithium battery diaphragms, the base film needs to be coated and dried on one side and then coated and dried on the other side. After coating on one side of the diaphragm, it needs to pass through the oven continuously at one time so that the diaphragm can be dried in the oven at one time to avoid affecting the coating and drying process of the other side in the subsequent process. Therefore, the oven size of the current drying device is generally large, especially the length is long in the length direction along the diaphragm, and the overall space in the oven is large.

[0003] In addition, during the process of drying the diaphragm, it is necessary to maintain the temperature and humidity balance in the oven. Since water will continue to evaporate during the drying process of the diaphragm, the humidity inside the oven will increase. The increasing humidity will affect the drying effect on the other side of the diaphragm and affect the performance of the diaphragm. The current solution is to directly discharge the high-humidity hot air in the oven. The high-humidity hot air is continuously discharged, resulting in high energy consumption of the current drying device.

[0004] Against the above background, the inventors have designed a circulating air system for a drying device for lithium battery diaphragm coating to solve one or more of the above problems, and thus proposed the present application. Utility Model Content

[0005] The purpose of the present application is to provide a circulating air system for a drying device for coating lithium battery diaphragms, so as to solve the problem of high energy consumption of drying devices in the prior art.

[0006] In order to solve the above technical problems, the utility model adopts the following solutions:

[0007] A circulating air system of a drying device for coating lithium battery diaphragm, comprising a plurality of ovens each having a drying chamber and a heat pump for heating air, and an air inlet duct and an air outlet duct connected to the drying chamber, wherein the ends of the air inlet duct and the air outlet duct away from the drying chamber are respectively connected to the air outlet end and the air inlet end of the heat pump;

[0008] It also includes a return air duct connected to the air inlet duct and the air outlet duct respectively, and a flow regulating valve arranged on the air inlet duct and the air outlet duct.

[0009] Preferably, the number of the ovens is at least two, and the two or more ovens are distributed along the direction of the film and the drying chambers of the ovens are connected along the direction of the film;

[0010] The air inlet duct includes an air inlet main pipe and an air inlet branch pipe connected to the drying chamber of each oven, and the air inlet main pipe is connected to the air inlet main pipe;

[0011] It also includes a temperature sensor arranged in the drying chamber, a humidity sensor arranged in the air outlet duct, and an auxiliary heating device arranged between the air inlet branch pipe and the drying chamber.

[0012] Preferably, each oven is provided with two drying chambers, an upper drying chamber and a lower drying chamber;

[0013] The air inlet duct also includes a Y-shaped air inlet pipe connected to the air inlet branch pipe, one end of the Y-shaped air inlet pipe is connected to the air inlet branch pipe, and the other two ends are respectively connected to the two drying chambers of the same oven;

[0014] The auxiliary heating device is arranged between the Y-shaped air inlet pipe and the air inlet branch pipe.

[0015] Preferably, the flow regulating valve comprises an air inlet regulating valve arranged on the Y-shaped air inlet pipe;

[0016] The number of the air inlet regulating valves is the same as the number of the drying chambers, and the air inlet regulating valves are used to adjust the air volume entering the drying chambers.

[0017] Preferably, it also includes a fan arranged between the air inlet branch pipe and the auxiliary heating device;

[0018] The auxiliary heating device comprises a resistance heating wire.

[0019] Preferably, each oven is provided with two drying chambers, an upper drying chamber and a lower drying chamber;

[0020] The air outlet duct comprises an air outlet main pipe and a Y-shaped air outlet pipe connected to the air outlet main pipe, one end of the Y-shaped air outlet pipe is connected to the air outlet main pipe, and the other two ends are respectively connected to two drying chambers of the same oven.

[0021] Preferably, the flow regulating valve comprises an air flow regulating valve arranged on the Y-shaped air outlet pipe;

[0022] The number of the air outlet regulating valves is the same as the number of the drying chambers, and the air outlet regulating valves are used to adjust the air volume discharged from the drying chambers.

[0023] Preferably, one end of the return air duct is connected to the Y-shaped air outlet duct, and the other end is connected to the air inlet branch pipe;

[0024] It also includes a return air volume regulating valve arranged on the return air duct.

[0025] Preferably, the heat pump is provided with a return air chamber, a hot air module for air heating and a dehumidification module for air dehumidification;

[0026] The air outlet duct is connected to the return air chamber through the air inlet end of the heat pump, the air inlet duct is connected to the air outlet end of the hot air module through the air outlet end of the heat pump, the dehumidification module and its air outlet end are located in the return air chamber, and the air inlet end of the dehumidification module is connected to the external air.

[0027] Preferably, the dehumidification module includes a condenser, and a drain pipe is provided at the bottom of the condenser.

[0028] Beneficial effects of the utility model:

[0029] The present application sets a return air duct connected to the air inlet duct and the air outlet duct, so that a part of the humid hot air discharged from the drying chamber can flow back into the air inlet duct through the return air duct and re-enter the drying chamber, and the other part returns to the heat pump through the air outlet duct, and after being reprocessed, it returns to the drying chamber or / and is discharged to the outside. The hot air with high humidity in the return air duct is mixed with the dry hot air discharged by the heat pump through the air outlet end, so that the humidity of the air entering the drying chamber is relatively balanced, and the hot air discharged from the drying chamber can be prevented from being completely discharged, which can effectively reduce the energy consumption of the entire drying device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of Example 1 of the utility model;

[0031] Figure 2 This is a schematic diagram of the main structure of Embodiment 1 of the present utility model;

[0032] Figure 3 This is a schematic diagram of the connection relationship of Example 1 of the utility model;

[0033] Figure 4 This is a schematic diagram of the structure of the heat pump in Example 1 of the utility model.

[0034] Description of reference numerals:

[0035] 1-heat pump, 2-drying oven, 21-upper drying chamber, 22-lower drying chamber, 311-air inlet main pipe, 312-air inlet branch pipe, 313-Y-shaped air inlet pipe, 321-air outlet main pipe, 322-Y-shaped air outlet pipe, 33-return air pipe, 331-return air volume regulating valve, 4-fan, 5-auxiliary heating device, 6-temperature sensor, 7-humidity sensor, 801-air inlet volume regulating valve, 802-air outlet volume regulating valve. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0037] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The present invention is described in detail below with reference to the accompanying drawings and in combination with embodiments:

[0040] Reference Figures 1 to 4 As shown, this embodiment provides a circulating air system of a drying device for lithium battery diaphragm coating, comprising a plurality of ovens 2 each having a drying chamber and a heat pump 1 for heating air, and an air inlet duct and an air outlet duct connected to the drying chamber, wherein the ends of the air inlet duct and the air outlet duct away from the drying chamber are respectively connected to the air outlet end and the air inlet end of the heat pump 1;

[0041] It also includes a return air duct 33 connected to the air inlet duct and the air outlet duct respectively, and flow regulating valves arranged on the air inlet duct and the air outlet duct.

[0042] The present application sets a heat pump 1, an air outlet duct, an air inlet duct, a return air duct 33 and a flow regulating valve, so that the air heated by the heat pump 1 can enter the drying chamber of the oven 2 through the air inlet duct, and after the drying diaphragm, a part of it flows back to the air inlet duct through the return pipe and re-enters the drying chamber, and the other part returns to the heat pump 1 through the air outlet duct, and after being reprocessed, it returns to the drying chamber or / and is discharged to the outside. The hot air with high humidity in the return air duct 33 is mixed with the dry hot air discharged from the heat pump 1 through the air outlet end, so that the humidity of the air entering the drying chamber is relatively balanced, and the hot air discharged from the drying chamber can be prevented from being completely discharged, which can effectively reduce the energy consumption of the entire drying device.

[0043] In some embodiments, reference Figure 3As shown, a temperature sensor 6 is provided in the drying chamber, and the flow regulating valves provided on the air inlet duct and the air outlet duct in the present application can control the amount of hot air retained in the drying chamber and reduce the ineffective loss of heat. In particular, in some preferred embodiments, an automatically controlled flow regulating valve can be used, which can be flexibly adjusted according to the temperature in the drying chamber to save energy consumption.

[0044] In some preferred embodiments, the number of the ovens 2 is at least two, and the two or more ovens 2 are distributed along the film direction and the drying chambers of the ovens 2 are connected along the film direction;

[0045] The air inlet duct includes an air inlet main pipe 311 and an air inlet branch pipe 312 connected to the drying chamber of each oven 2, and the air inlet main pipe 311 is connected to the air inlet main pipe 311;

[0046] It also includes a temperature sensor 6 arranged in the drying chamber, a humidity sensor 7 arranged in the air outlet duct, and an auxiliary heating device 5 arranged between the air inlet branch pipe 312 and the drying chamber.

[0047] In this embodiment, multiple ovens 2 are provided, and the cavity of the entire drying diaphragm can be divided into multiple chambers for fine control. In particular, the cavity length of the entire heating diaphragm is relatively long, and the distance between the feed end where the diaphragm enters the oven 2 and the discharge end where the diaphragm exits the oven 2 is relatively far. The humidity of the diaphragm when entering the oven 2 and when exiting the oven 2 are quite different. By providing multiple ovens 2, the discharge of moist hot air from each chamber can be finely controlled to reduce energy consumption.

[0048] In addition, the present embodiment can monitor the humidity of the air exhausted from the drying chamber by setting a humidity sensor 7, thereby controlling the humidity of the hot air entering the drying chamber by controlling the return air volume of the return air duct 33, and setting an auxiliary heating device 5, and the auxiliary heating device 5 is located between the air inlet branch 312 and the drying chamber, so that the chamber whose temperature does not meet the preset temperature can be individually matched and heated.

[0049] In some preferred embodiments, reference Figure 1 and Figure 2 As shown, each oven 2 is provided with two drying chambers, an upper drying chamber 21 and a lower drying chamber 22;

[0050] The air inlet duct also includes a Y-shaped air inlet duct 313 connected to the air inlet branch 312, one end of the Y-shaped air inlet duct 313 is connected to the air inlet branch 312, and the other two ends are respectively connected to the two drying chambers of the same oven 2;

[0051] The auxiliary heating device 5 is arranged between the Y-shaped air inlet pipe 313 and the air inlet branch pipe 312. Since the diaphragm needs to be coated on both sides and heated and dried after each coating, the oven 2 in the present application has upper and lower drying chambers, so that the two film dryings after the diaphragm coating can be completed through the two drying chambers of the same oven 2, which can improve the utilization efficiency of hot air and reduce the overall energy consumption.

[0052] In some preferred embodiments, the flow regulating valve includes an air inlet regulating valve 801 disposed on the Y-shaped air inlet pipe 313;

[0053] The number of air inlet regulating valves 801 is the same as the number of drying chambers, and the air inlet regulating valves 801 are used to adjust the air volume entering the drying chamber. The air inlet regulating valves 801 are arranged on the Y-shaped air inlet pipe 313, and the number of air inlet regulating valves 801 is the same as the number of drying chambers, so that the air inlet regulating valves 801 can adjust the air inlet volume of each drying chamber.

[0054] In some preferred embodiments, it further includes a fan 4 disposed between the air inlet branch pipe 312 and the auxiliary heating device 5;

[0055] The auxiliary heating device 5 includes a resistance heating wire. The auxiliary heating device 5 in the present application is a resistance heating wire to prevent the auxiliary heating device 5 from affecting the air supply of the fan 4.

[0056] In some preferred embodiments, Figure 1 and Figure 2 As shown, each oven 2 is provided with two drying chambers, an upper drying chamber 21 and a lower drying chamber 22;

[0057] The air outlet duct includes an air outlet main pipe 321 and a Y-shaped air outlet pipe 322 connected to the air outlet main pipe 321 . One end of the Y-shaped air outlet pipe 322 is connected to the air outlet main pipe 321 , and the other two ends are respectively connected to two drying chambers of the same oven 2 .

[0058] In some preferred embodiments, the flow regulating valve includes an air flow regulating valve 802 disposed on the Y-shaped air outlet pipe 322;

[0059] The number of the air volume regulating valves 802 is the same as the number of the drying chambers, and the air volume regulating valves 802 are used to adjust the air volume discharged from the drying chamber. The air volume regulating valves 802 are arranged on the Y-shaped air outlet pipe 322, and the number of the air volume regulating valves 802 is the same as the number of the drying chambers, so that the air volume regulating valves 802 can adjust the air volume of each drying chamber, and the air inlet regulating valve 801 and the air outlet regulating valve 802 connected to each drying chamber are adjusted and controlled, so that the hot air retention amount of each drying chamber can be controlled, and the temperature in the drying chamber can be controlled.

[0060] In some preferred embodiments, one end of the return air duct 33 is connected to the Y-shaped air outlet duct 322, and the other end is connected to the air inlet branch duct 312;

[0061] It also includes a return air volume regulating valve 331 disposed on the return air duct 33. The return air volume regulating valve 331 is provided to adjust the return air volume of the return air duct 33. In this embodiment, the inlet air volume regulating valve 801, the outlet air volume regulating valve 802, and the return air volume regulating valve 331 can all adopt the same type of flow regulating valve.

[0062] In some preferred embodiments, Figure 4 As shown, the heat pump 1 is provided with a return air chamber, a hot air module for air heating, and a dehumidification module for air dehumidification;

[0063] The air outlet duct is connected to the return air chamber through the air inlet end of the heat pump 1, the air inlet duct is connected to the air outlet end of the hot air module through the air outlet end of the heat pump 1, the dehumidification module and its air outlet end are located in the return air chamber, and the air inlet end of the dehumidification module is connected to the outside air. The return air chamber, the hot air module and the dehumidification module are arranged so that a part of the moist hot air returning from the air outlet duct can enter the drying chamber through the air inlet duct after being heated, while the other part can be dehumidified by the dehumidification module and then enter the hot air module for heating to reduce the humidity. The high-humidity exhaust gas after dehumidification is discharged from the entire system. In addition, in order to supplement the amount of exhaust air, the outside air can enter the hot air module after being dehumidified by the dehumidification module, and enter the drying chamber through the air inlet duct.

[0064] In some preferred embodiments, the dehumidification module includes a condenser, and a drain pipe is provided at the bottom of the condenser.

[0065] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A circulating air system for a drying device for coating lithium battery separators, characterized in that: It comprises a plurality of ovens (2) each having a drying chamber, a heat pump (1) for heating air, and an air inlet duct and an air outlet duct connected to the drying chamber, wherein the ends of the air inlet duct and the air outlet duct away from the drying chamber are respectively connected to the air outlet end and the air inlet end of the heat pump (1); It also includes an air return pipe (33) respectively connected to the air inlet pipe and the air outlet pipe, and flow regulating valves arranged on the air inlet pipe and the air outlet pipe.

2. The circulating air system of the drying device for coating lithium battery separator according to claim 1, characterized in that: The number of the ovens (2) is at least two, the two or more ovens (2) are distributed along the direction of the film, and the drying chambers of the ovens (2) are connected along the direction of the film; The air inlet duct comprises an air inlet main pipe (311) and an air inlet branch pipe (312) connected to the drying chamber of each oven (2), and the air inlet main pipe (311) is connected to the air inlet main pipe (311); It also includes a temperature sensor (6) disposed in the drying chamber, a humidity sensor (7) disposed in the air outlet duct, and an auxiliary heating device (5) disposed between the air inlet branch pipe (312) and the drying chamber.

3. The circulating air system of the drying device for coating lithium battery separator according to claim 2, characterized in that: Each drying oven (2) is provided with two drying chambers, an upper drying chamber (21) and a lower drying chamber (22); The air inlet duct further comprises a Y-shaped air inlet pipe (313) connected to the air inlet branch pipe (312); one end of the Y-shaped air inlet pipe (313) is connected to the air inlet branch pipe (312), and the other two ends are respectively connected to two drying chambers of the same oven (2); The auxiliary heating device (5) is arranged between the Y-shaped air inlet pipe (313) and the air inlet branch pipe (312).

4. The circulating air system of the drying device for coating lithium battery separator according to claim 2, characterized in that: The flow regulating valve comprises an air inlet regulating valve (801) arranged on the Y-shaped air inlet pipe (313); The number of air inlet regulating valves (801) is the same as the number of drying chambers, and the air inlet regulating valves (801) are used to regulate the air volume entering the drying chamber.

5. The circulating air system of the drying device for coating lithium battery separator according to claim 2, characterized in that: It also includes a fan (4) disposed between the air inlet branch pipe (312) and the auxiliary heating device (5); The auxiliary heating device (5) comprises a resistance heating wire.

6. The circulating air system of the drying device for coating lithium battery separator according to claim 2, characterized in that: Each drying oven (2) is provided with two drying chambers, an upper drying chamber (21) and a lower drying chamber (22); The air outlet duct comprises an air outlet main pipe (321) and a Y-shaped air outlet pipe (322) connected to the air outlet main pipe (321); one end of the Y-shaped air outlet pipe (322) is connected to the air outlet main pipe (321), and the other two ends are respectively connected to two drying chambers of the same oven (2).

7. The circulating air system of the drying device for coating lithium battery separator according to claim 6, characterized in that: The flow regulating valve comprises an air flow regulating valve (802) arranged on the Y-shaped air outlet pipe (322); The number of air outlet regulating valves (802) is the same as the number of drying chambers, and the air outlet regulating valves (802) are used to adjust the air volume discharged from the drying chamber.

8. The circulating air system of the drying device for coating lithium battery separator according to claim 6, characterized in that: One end of the return air duct (33) is connected to the Y-shaped air outlet duct (322), and the other end is connected to the air inlet branch duct (312); It also includes a return air volume regulating valve (331) arranged on the return air duct (33).

9. The circulating air system of the drying device for coating lithium battery separator according to claim 1, characterized in that: The heat pump (1) is provided with a return air chamber, a hot air module for air heating, and a dehumidification module for air dehumidification; The air outlet duct is connected to the return air chamber through the air inlet end of the heat pump (1), the air inlet duct is connected to the air outlet end of the hot air module through the air outlet end of the heat pump (1), the dehumidification module and its air outlet end are located in the return air chamber, and the air inlet end of the dehumidification module is connected to the external air.

10. The circulating air system of the drying device for coating lithium battery separator according to claim 9, characterized in that: The dehumidification module comprises a condenser, and a drain pipe is arranged at the bottom of the condenser.

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