Lithium battery drying system

Abstract

The utility model relates to the technical field of lithium battery production, in particular to a lithium battery drying system which comprises a drying production line provided with an air supply outlet and an air exhaust outlet. The heat pump mechanism is provided with an evaporation side and a condensation side; the sensible heat exchanger is provided with a first channel and a second channel; the first end of the first channel communicates with outside fresh air, the second end of the first channel is connected with the air supply outlet, and the fresh air exchanges heat with the condensation side in the air supply process; the first end of the second channel is communicated with the evaporation side, and the second end of the second channel is communicated with the exhaust outlet. According to the embodiment of the utility model, the condensation side of the heat pump mechanism is adopted for heat exchange, the energy efficiency ratio is obviously higher, and meanwhile, after the sensible heat exchanger is adopted, the heat of exhaust air can be further recovered, so that the energy consumption can be reduced. And meanwhile, the heat of the exhaust air can preheat the fresh air, so that the energy consumption can be further reduced, and the energy utilization rate is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium electricity production technical field, concretely relates to a lithium electricity drying system. BACKGROUND

[0002] The drying step in the traditional lithium electricity production process adopts electric heating heat supply, and the air in the oven is heated through heat conducting oil and its heat exchanger. At present, more than 90% of the traditional electric heating oven equipment adopts unified single oven unit, and the electric heating configuration is the same.

[0003] But this way makes the energy utilization efficiency low, which is not conducive to environmental protection. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a lithium electricity drying system to solve the problem of low energy utilization rate when adopting the electric heating mode for drying in the lithium electricity production process.

[0005] In the first aspect, the utility model provides a lithium electricity drying system, which comprises:

[0006] The drying production line is provided with air supply ports and air exhaust ports; along the conveying direction of the drying production line, a part of the air exhaust ports are arranged on the upstream side of the drying production line, and the other part of the air exhaust ports are arranged on the downstream side of the drying production line, and all the air supply ports are arranged in the middle region of the drying production line in correspondence;

[0007] The heat pump mechanism is provided with an evaporation side and a condensation side;

[0008] The sensible heat exchanger is provided with a first channel and a second channel which are staggered and crossed; the first channel and the second channel exchange heat at the coincident position;

[0009] The first end of the first channel is communicated with the fresh air outside, the second end of the first channel is connected with the air supply port, and the fresh air exchanges heat with the condensation side in the air supply process;

[0010] The first end of the second channel is communicated with the evaporation side, and the second end of the second channel is communicated with the air exhaust port.

[0011] Beneficial effects: the embodiment of the utility model discloses through the condensation side of heat pump mechanism carries out heat exchange, compared with traditional electric heating heating mode, obviously energy efficiency ratio is higher, simultaneously, after using sensible heat heat exchanger, the heat of exhaust air can be further recovered, thereby can realize reducing energy consumption. Meanwhile, after the fresh air passes through sensible heat heat exchanger, the heat of exhaust air can preheat the fresh air, thereby can reduce the energy consumed by heat pump mechanism, therefore can further reduce energy consumption, improve energy utilization. Further, compared with traditional heat pipe heat exchanger, sensible heat heat exchanger can directly as intermediate exchange medium, can directly carry out heat exchange to the temperature and humidity of air, need not set up traditional complex pipeline, further simplifies the overall structure layout.

[0012] Further, the embodiment sets the exhaust port at the upstream side and the downstream side, which can ensure that the fresh air enters the drying production line from multiple positions and is evenly distributed in the entire drying area. Moreover, the fresh air can be introduced more effectively, increasing the air circulation speed and improving the drying efficiency. Meanwhile, a more uniform temperature gradient can be formed to avoid uneven drying caused by temperature differences. Further, the embodiment sets the air supply port in the middle region to effectively remove moisture, which can remove the moisture to the upstream side and the downstream side, avoid the retention of moisture in the drying cavity, ensure the uniform distribution of air flow, and further improve the overall drying effect. Moreover, the exhaust ports are concentrated in the middle region, which can better utilize the heat generated during the drying process and reduce energy waste. In particular, after the air flow enters the drying production line, the air flows from the middle region to the upstream side and the downstream side of the drying production line. Moreover, as the drying medium is transported, the moisture content of the drying medium is continuously reduced, and the overall dehumidification efficiency shows a trend of first increasing and then decreasing. This trend corresponds to the air humidity saturation principle.

[0013] In an alternative embodiment, the drying production line comprises:

[0014] a drying cavity provided with the air supply port and the exhaust port;

[0015] a conveying assembly arranged in the drying cavity, the conveying assembly being configured to convey the drying medium;

[0016] an air duct assembly provided with an air inlet channel and an exhaust channel, a first end of the air inlet channel being connected to the air supply port, a second end of the air inlet channel being connected to the second end of the first channel, one end of the exhaust channel being connected to the second end of the second channel, and a second end of the exhaust channel being connected to the exhaust port.

[0017] In an alternative embodiment, the drying cavity is provided with two exhaust ports and one air supply port, the two exhaust ports being arranged at the upstream end and the downstream end of the conveying assembly, and the air supply port being arranged at the middle position of the conveying assembly.

[0018] In an alternative embodiment, the conveying assembly comprises:

[0019] A roller set extending along the conveying direction of the drying production line.

[0020] A driving motor connected to the roller set.

[0021] In an alternative embodiment, the drying production line further comprises:

[0022] A thermal insulation layer applied to the inner wall of the drying production line.

[0023] Beneficial effects: The thermal insulation layer can effectively reduce heat exchange between the inside and outside of the drying cavity, reduce heat loss, and improve the energy efficiency of the entire system. Moreover, by reducing heat loss, energy consumption can be significantly reduced, thereby saving operating costs. At the same time, the thermal insulation layer helps to maintain the temperature stability in the drying cavity, avoids temperature fluctuations, ensures the uniformity and consistency of the drying process, and a stable temperature environment can improve the drying effect and ensure product quality. Further, it can also improve energy efficiency and reduce energy consumption, which helps to reduce carbon emissions and meet environmental protection requirements.

[0024] In an alternative embodiment, the thermal insulation layer is provided at the top of the drying cavity.

[0025] In an alternative embodiment, the thermal insulation layer is also provided at the bottom of the drying cavity.

[0026] In an alternative embodiment, the condensing side comprises:

[0027] A condenser provided between the second end of the first channel and the air supply port; the fresh air enters the air supply port after heat exchange with the condenser during air supply.

[0028] In an alternative embodiment, the first channel is provided with a fresh air fan and a fresh air valve at one end close to the outside, and the evaporating side is provided with an exhaust fan and an exhaust valve at one end close to the outside. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present application, the following will briefly introduce the drawings needed to be used in the specific embodiments or related technology description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 The current drying principle diagram of electric heating method;

[0031] Figure 2 The drying efficiency diagram of the current electric heating method;

[0032] Figure 3 The structure schematic diagram of the lithium battery drying system in the embodiment of the utility model;

[0033] Figure 4 The Figure 3 The schematic diagram of medium moisture content and dehumidification efficiency along the production line direction of the lithium battery drying system;

[0034] Figure 5 The psychrometric chart in the embodiment of the utility model.

[0035] Explanation of reference signs:

[0036] 1, drying production line; 11, air supply port; 12, air exhaust port; 13, drying cavity; 14, conveying assembly; 15, air duct assembly; 16, heat preservation layer;

[0037] 2, heat pump mechanism; 21, evaporator; 22, expansion valve; 23, compressor; 24, condenser;

[0038] 3, sensible heat exchanger; 31, first channel; 32, second channel. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0040] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "mount", "link", "connect" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can through the indirect connection of intermediate medium, also can be the intercommunication of two elements, can be wireless connection, also can be wired connection.For the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to the specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict between them.

[0043] The drying step in the traditional lithium battery production process adopts electric heating heating, and the air in the oven is heated by heat-conducting oil and its heat exchanger. At present, more than 90% of the traditional electric heating oven equipment adopts unified single oven unit, and the electric heating configuration is the same. However, this method has low energy utilization efficiency and is not conducive to environmental protection.

[0044] Therefore, the utility model provides a lithium battery drying system to solve the problem of low energy utilization rate when using electric heating method for drying in the lithium battery production process.

[0045] The embodiments of the utility model will be described below in combination with Figures 1 to 5 .

[0046] According to the embodiments of the utility model, on the one hand, a lithium battery drying system is provided, which comprises a drying production line 1, a heat pump mechanism 2 and a sensible heat exchanger 3.

[0047] Specifically, in this embodiment, the drying production line 1 contains a roller drive combination for driving the one-way movement of the medium to be dried, which can be composed of rollers, drive motors and their supporting electrical equipment. The drying production line 1 is also provided with an air supply port 11 and an air exhaust port 12, and the air exhaust port 12 and the air supply port 11 are located at the top of the drying production line 1, which is convenient for the installation of air duct connection. Of course, the air supply port 11 and the air exhaust port 12 can also be installed at other positions of the drying production line 1, and this embodiment is only an example, but it is not limited to this, and those skilled in the art can change it according to the actual situation, which can achieve the same technical effect.

[0048] Further, in an alternative embodiment, along the conveying direction of the drying production line 1, a part of the air supply ports 11 are arranged on the upstream side of the drying production line 1, and the other part of the air supply ports 11 are arranged on the downstream side of the drying production line 1, and all the air exhaust ports 12 are arranged in the middle region of the drying production line 1.

[0049] In this way, the air supply port 11 is arranged on the upstream side and the downstream side in the present embodiment, so that the fresh air can enter the drying production line 1 from multiple positions and be uniformly distributed in the entire drying area. In addition, the fresh air can be introduced more effectively, the air circulation speed can be increased, and the drying efficiency can be improved. At the same time, a more uniform temperature gradient can be formed, and uneven drying caused by temperature difference can be avoided. Further, the air exhaust port 12 is arranged in the middle region in the present embodiment, so that the moisture can be effectively exhausted from the middle position, the moisture can be prevented from being retained in the drying cavity 13, the uniform distribution of the air flow can be ensured, and the overall drying effect can be improved. In addition, the air exhaust port 12 is concentrated in the middle region, so that the heat generated during the drying process can be better utilized, and energy waste can be reduced.

[0050] Further, in the present embodiment, the heat pump mechanism 2 generally includes four components of the heat pump, i.e., a compressor 23, an evaporator 21, a condenser 24, and an expansion valve 22. The refrigerant circulates in the heat pump mechanism 2, and completes efficient heat transfer: compressed by the compressor 23, releases heat by the condenser 24, pressure-reduced by the expansion valve 22, absorbs heat by the evaporator 21, and returns to the compressor 23. The evaporation side of the heat pump mechanism 2 is the cooling side where the evaporator 21 is located, and the condensation side of the heat pump mechanism 2 is the heating side where the condenser 24 is located. After the normal temperature air passes through the evaporator 21, the heat of the evaporator 21 is absorbed, so that the temperature of the normal temperature air is lowered, and thus the cooling side is formed. After the normal temperature air passes through the condenser 24, the heat of the condenser 24 is absorbed, so that the temperature of the normal temperature air is increased, and thus the heating side is formed.

[0051] Specifically, in the present embodiment, the compressor 23 is a power source of a fluorine system, which compresses the low-temperature and low-pressure refrigerant gas into high-temperature and high-pressure gas, and enters the condenser 24. The compressor 23 is a high-temperature refrigerant compressor 23, wherein the high-temperature refrigerant can be R134a, R515B, R245fa, R1233zd, R1234yd, R1336mzz, or the like, which has a critical temperature greater than 100°C.

[0052] The condenser 24 functions to release heat inside the high-temperature and high-pressure refrigerant, and cool it into high-temperature and high-pressure liquid. The condensation and heat release process of the refrigerant in the condenser 24 directly heats the air, the air is heated to high-temperature and dry air at the target temperature at this position, and enters the air supply port 11. Thus, the heat loss that may occur in other heat exchange processes is avoided, and the operation is more efficient.

[0053] The expansion valve 22 functions to reduce the pressure of the refrigerant after passing through the expansion valve 22, so that the refrigerant becomes low-temperature and low-pressure liquid, and enters the evaporator 21.

[0054] The evaporator 21 functions to absorb heat from the air in the exhaust air duct in a low-temperature and low-pressure state, and evaporate into a gas. At the same time, the medium-dry air with moisture is cooled and dehumidified after passing through the evaporator 21, and is reduced to low-temperature air and discharged, and the cooling process is accompanied by condensate water, thereby completing the dehumidification, cooling and heat recovery of the exhaust air.

[0055] Further, in the embodiment, the sensible heat exchanger 3 is provided with the first channel 31 and the second channel 32 which are staggered and crossed, and the first channel 31 exchanges heat with the second channel 32 at the coincident position. The first end of the first channel 31 is communicated with the fresh air, the second end of the first channel 31 is connected with the air supply port 11, and the fresh air exchanges heat with the condensation side in the air supply process. The first end of the second channel 32 is communicated with the evaporation side, and the second end of the second channel 32 is communicated with the exhaust air port 12.

[0056] In the actual working process, the low-temperature dry fresh air first passes through the first channel 31 of the sensible heat exchanger 3, is heated by the high-temperature exhaust air in the second channel 32, and the temperature is increased to medium temperature, so as to realize preheating. Then the medium-temperature dry air passes through the condensation side, and the air is heated to the target temperature, and the humidity of the air heated by the condensation side is significantly reduced. The high-temperature dry air is sent to the drying production line 1 to dry the products. The high-temperature exhaust air after drying contains increased moisture, and is sent to the second channel 32 of the sensible heat exchanger 3 through the exhaust air port 12. The high-temperature exhaust air in the second channel 32 heats the low-temperature fresh air, and the temperature of the exhaust air is reduced to medium temperature. The medium-temperature and high-humidity exhaust air exchanges heat with the evaporation side for heat recovery, and then condensate water is separated out and discharged. The exhaust air is discharged from the system after being reduced to low-temperature air.

[0057] In this way, the condensation side of the heat pump mechanism 2 is used for heat exchange in the embodiment of the utility model, compared with the traditional electric heating heating mode, the energy efficiency ratio is higher, and after the sensible heat exchanger 3 is used, the heat of the exhaust air can be further recovered, so that the energy consumption can be reduced. At the same time, the heat of the exhaust air can preheat the fresh air after the fresh air passes through the sensible heat exchanger 3, so that the energy consumption of the heat pump mechanism 2 can be reduced, and the energy utilization rate can be improved. Further, compared with the traditional heat pipe heat exchanger, the sensible heat exchanger 3 can directly act as an intermediate exchange medium, and can directly exchange heat with the temperature and humidity of the air, without the need to set up a traditional complex pipeline, and the overall structure layout is further simplified.

[0058] Further, in an optional embodiment, the drying production line 1 includes a drying cavity 13, a conveying assembly 14 and an air duct assembly 15.

[0059] Specifically, in the embodiment, the drying cavity 13 is provided with the air supply port 11 and the air exhaust port 12. The conveying assembly 14 is arranged in the drying cavity 13, and the conveying assembly 14 is used for conveying the medium to be dried. The conveying assembly 14 can be composed of rollers, a driving motor and a matching electrical device. Of course, the embodiment only exemplarily illustrates the composition of the conveying assembly 14, but the application is not limited thereto, and those skilled in the art can make changes according to actual conditions, as long as the same technical effects can be achieved.

[0060] Further, the air duct assembly 15 is provided with an air inlet channel and an air exhaust channel. The first end of the air inlet channel is connected with the air supply port 11, the second end of the air inlet channel is connected with the second end of the first channel 31, one end of the air exhaust channel is connected with the second end of the second channel 32, and the second end of the air exhaust channel is connected with the air exhaust port 12.

[0061] Further, as shown in Figure 1 , the current electric heating drying mode is generally uniformly provided with a matching air inlet and air outlet along the conveying direction of the production line, so that the overall dehumidification efficiency presents a wave of high and low, as shown in Figure 2 , so the overall dehumidification efficiency is low, and the setting of the multi-air port system is complex, and the energy utilization efficiency is low, which is not conducive to environmental protection.

[0062] Further, in an alternative embodiment, as shown in Figure 3 , the drying cavity 13 is provided with at least two air exhaust ports 12 and at least one air supply port 11. The air exhaust ports 12 can be uniformly arranged on the top of the drying cavity 13, so that the medium to be dried can be uniformly dried during the conveying process. The air supply port 11 can be arranged on the top of the drying cavity 13, so as to increase the path in the air flow circulation process and reduce the heat loss. Of course, the embodiment only exemplarily illustrates the setting mode of the air supply port 11 and the air exhaust port 12, but the application is not limited thereto, and those skilled in the art can make changes according to actual conditions, as long as the same technical effects can be achieved.

[0063] Specifically, in the embodiment, along the conveying direction of the conveying assembly 14, i.e. along the conveying direction of the drying production line 1, the change of the moisture content of the drying medium and the overall flow direction of the air are as shown in Figure 3 .

[0064] As can be seen, after the air flow enters the drying production line 1, the air flows from the middle region to the upstream side and the downstream side of the drying production line 1, respectively. The upstream side of the drying production line 1 is the side close to the inlet of the drying production line 1, and the downstream side of the drying production line 1 is the side close to the outlet of the drying production line 1. And in Figure 4As can be seen, the moisture content of the medium to be dried continuously decreases as it is transported, and the overall dehumidification efficiency first increases and then decreases. This trend corresponds to the principle of air humidity saturation.

[0065] The overall dehumidification efficiency shows a trend of first increasing and then decreasing, which is explained as follows:

[0066] In the heating and dehumidification section, the temperature gradually rises, but the relative humidity remains high. According to the air humidity saturation theory, air can hold less water vapor at lower temperatures. When the temperature begins to rise, although the humidity is relatively high, if a large amount of fresh air is introduced at this point, it needs to be heated to the appropriate operating temperature after entering drying line 1. However, since the temperature at this stage is not yet very high, the evaporation of water vapor from the drying medium is relatively slow. Introducing a large amount of fresh air not only increases the energy consumption for heating the fresh air but also fails to effectively remove water vapor from the system due to low dehumidification efficiency. Therefore, by controlling the amount of fresh air entering, the demand for heating the fresh air is reduced, while avoiding excessive water vapor accumulation in the system, as the system's dehumidification capacity is limited at this stage. Of course, a fresh air valve can be installed at the fresh air inlet to control the amount of fresh air entering.

[0067] Next, the process enters the high-temperature dehumidification section. This section has the highest temperature in the entire process, where the air can hold the most water vapor, and the dehumidification efficiency is significantly higher. According to the humidity saturation curve, water vapor evaporates more easily from the medium to be dried at high temperatures.

[0068] Ventilation at this stage is the most effective way to dehumidify. Exhausting a large amount of humid air can rapidly reduce the humidity within the system. Because the humidity inside the system decreases, the partial pressure difference between the water vapor in the medium to be dried and the water vapor in the surrounding air increases, which facilitates the continued diffusion of water vapor from the material, forming a highly efficient dehumidification cycle.

[0069] Finally, the cooling and dehumidification section begins. Similar to the heating and dehumidification section, the temperature gradually decreases, and the air's ability to hold moisture also reduces. If a large amount of fresh air is introduced at this point, the fresh air may reach saturation during the cooling process and release moisture, which could actually increase the humidity within the system.

[0070] Furthermore, at lower temperatures, the rate at which water vapor evaporates from the material slows down, resulting in lower dehumidification efficiency. Controlling the fresh air intake can prevent unnecessary water vapor accumulation within the system, reduce the impact on downstream equipment such as cooling equipment, and avoid problems such as water vapor condensation on the material surface during cooling, thereby ensuring product quality.

[0071] Furthermore, in an alternative implementation, such as Figure 3As shown, the drying cavity 13 is provided with two exhaust openings 12 and one air supply opening 11, the two exhaust openings 12 are respectively arranged at the upstream end and the downstream end of the conveying assembly 14, and the air supply opening 11 is correspondingly arranged at the middle position of the conveying assembly 14.

[0072] Further, in an optional embodiment, the conveying assembly 14 includes a roller set and a driving motor. The roller set extends along the conveying direction of the drying production line 1, and the roller set is used for conveying the medium to be dried. The driving motor is connected with the roller set, and the driving motor is used for providing power for the roller set.

[0073] Of course, the number of roller sets can be changed by those skilled in the art according to actual conditions, and the embodiment does not limit this, and the overall length of the roller set can be matched with the conveying length of the drying production line 1.

[0074] Further, in an optional embodiment, the drying production line 1 further includes a heat preservation layer 16, which is arranged on the inner wall of the drying production line 1. Of course, the specific material of the heat preservation layer 16 is not limited in the embodiment, and those skilled in the art can change it according to actual conditions, as long as the same technical effect can be achieved.

[0075] Further, in an optional embodiment, the heat preservation layer 16 can be arranged at the top of the drying cavity 13. The heat preservation layer 16 can also be arranged at the bottom of the drying cavity 13.

[0076] In this way, the heat preservation layer 16 can effectively reduce the heat exchange between the inside and outside of the drying cavity 13, reduce the heat loss, and improve the energy efficiency of the whole system. Moreover, by reducing the heat loss, the energy consumption can be significantly reduced, thereby saving the operation cost. At the same time, the heat preservation layer 16 helps to maintain the temperature stability in the drying cavity 13, avoids temperature fluctuation, ensures the uniformity and consistency of the drying process, and the stable temperature environment can improve the drying effect and ensure the product quality. Further, it can also improve the energy efficiency and reduce the energy consumption, which helps to reduce carbon emissions and meet the environmental protection requirements.

[0077] Further, in an optional embodiment, as shown in Figure 3 The condensation side includes a condenser 24, which is arranged between the second end of the first channel 31 and the air supply opening 11. The fresh air enters the air supply opening 11 after heat exchange with the condenser 24 in the air supply process. That is, the fresh air is directly conveyed into the drying production line 1 after being heated by the condenser 24. Since pure refrigerant circulation is adopted, there is no need for additional hot water storage and circulation system, and the equipment is more compact.

[0078] Further, in an optional embodiment, the first channel 31 is provided with a fresh air fan and a fresh air valve at the end close to the outside world, and the evaporation side is provided with an exhaust fan and an exhaust valve at the end close to the outside world.

[0079] By adjusting the opening value of the exhaust valve and the fresh air valve, the exhaust humidity of the drying production line 1 can be adjusted. When increasing the opening value of the exhaust valve and reducing the opening value of the fresh air valve, the humidity can be reduced. When reducing the opening value of the exhaust valve and increasing the opening value of the fresh air valve, the humidity can be increased.

[0080] In summary, in combination with the heating and dehumidifying process of the sensible heat exchanger 3 and the condenser 24 and the evaporator 21, the temperature and humidity of the air can be accurately adjusted to the range suitable for drying requirements. The precise air conditioning capability of the present embodiment makes the drying process more uniform and stable, and improves the drying quality of the product.

[0081] Further, the enthalpy psychrometric chart of the drying production line 1 is as shown in Figure 5 The drying process is as follows: 1-2 heating process: sensible heat exchanger 3 + condenser 24; 2-3 drying process: drying air duct of the production line body; 3-4 sensible heat recovery process: sensible heat exchanger 3; 4-5 dehumidifying and cooling process (mainly heat recovery heat): evaporator 21.

[0082] In summary, the present embodiment uses efficient heat recovery technology and a refrigerant direct heating system, and the system COP is significantly improved. Compared with the traditional electric heating drying system, the energy consumption is reduced by more than 30%. The present embodiment uses environmentally friendly refrigerant, reduces the impact on the environment, and avoids pollution of the external environment due to the closed cycle design. Furthermore, the various components of the present embodiment can be automatically controlled, reducing the need for manual operation, reducing the operation difficulty, and improving the production efficiency. Due to the reduction of energy consumption and the improvement of drying efficiency, the operation cost of the system is greatly reduced, and good economic benefits are obtained.

[0083] Although the embodiments of the present application are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A lithium battery drying system, characterized by, The application relates to a drying production line (1) provided with air supply ports (11) and air exhaust ports (12); along the conveying direction of the drying production line (1), a part of the air exhaust ports (12) are arranged on the upstream side of the drying production line (1), another part of the air exhaust ports (12) are arranged on the downstream side of the drying production line (1), and all the air supply ports (11) are correspondingly arranged in the middle region of the drying production line (1); a heat pump mechanism (2) is arranged and provided with an evaporation side and a condensation side; a sensible heat exchanger (3) is arranged and provided with first channels (31) and second channels (32) which are staggered and crossed; the first channels (31) and the second channels (32) exchange heat at coincident positions; the first end of the first channels (31) is communicated with fresh air outside the world, the second end of the first channels (31) is connected with the air supply ports (11), and fresh air exchanges heat with the condensation side during air supply; the first end of the second channels (32) is communicated with the evaporation side, and the second end of the second channels (32) is communicated with the air exhaust ports (12). The drying production line (1) comprises: a drying cavity (13) provided with the air supply ports (11) and the air exhaust ports (12); a conveying assembly (14) arranged in the drying cavity (13) and used for conveying a medium to be dried; an air duct assembly (15) provided with an air inlet channel and an air exhaust channel, the first end of the air inlet channel is connected with the air supply ports (11), the second end of the air inlet channel is connected with the second end of the first channels (31), one end of the air exhaust channel is connected with the second end of the second channels (32), and the second end of the air exhaust channel is connected with the air exhaust ports (12). The drying cavity (13) is provided with two air exhaust ports (12) and one air supply port (11), the two air exhaust ports (12) are arranged at the upstream end and the downstream end of the conveying assembly (14) respectively, and the air supply port (11) is correspondingly arranged at the middle position of the conveying assembly (14).

2. The lithium battery drying system of claim 1, wherein, The conveying assembly (14) comprises: a roller group extending along the conveying direction of the drying production line (1); a driving motor connected with the roller group. The drying production line (1) further comprises:

3. The lithium battery drying system of claim 2, wherein, a heat preservation layer (16) arranged on the inner wall of the drying production line (1).

4. The lithium battery drying system according to claim 2 or 3, characterized in that, The heat preservation layer (16) is arranged at the top of the drying cavity (13). The heat preservation layer (16) is also arranged at the bottom of the drying cavity (13). The condensation side comprises:

5. The lithium battery drying system according to claim 2 or 3, wherein, a condenser (24) arranged between the second end of the first channels (31) and the air supply ports (11); fresh air enters the air supply ports (11) after exchanging heat with the condenser (24) during air supply. The first end of the first channels (31) is provided with a fresh air valve, and the evaporation side is provided with an air exhaust valve at the end close to the outside world.

6. The lithium battery drying system of claim 5, wherein, The first end of the first channels (31) is provided with a fresh air machine, and the evaporation side is provided with an air exhaust machine at the end close to the outside world.

7. The lithium battery drying system of claim 6, wherein, ​ 8. The lithium battery drying system according to any one of claims 1 to 3, wherein, ​ ​ 9. The lithium battery drying system according to any one of claims 1 to 3, wherein, ​ 10. The lithium battery drying system of claim 9, wherein, ​

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