Coating device and battery production line

Abstract

The utility model is applicable to the technical field of coating, and provides a coating device and a battery production line, the battery production line comprises a container for storing coating liquid, an injection pump, a coating tool bit, a conveying channel and a degassing unit, the container is connected with the injection pump through the conveying channel, the injection pump is connected with the coating tool bit, and the degassing unit is arranged on the conveying channel. The degassing unit is used for carrying out gas removal on the coating liquid, and the injection pump is used for conveying the coating liquid, so that the gas content in the coating liquid can be reduced, and the uniformity of the coating liquid coated on the substrate can be improved.

Description

Technical Field

[0001] The present application belongs to the field of coating technology, and in particular relates to a coating device and a battery production line. Background Art

[0002] Coating is to coat the prepared coating liquid evenly, continuously or intermittently on the substrate, and control the coating thickness according to the process requirements to meet the weight requirements. At the same time, the solvent in the coating liquid spread on the substrate is removed by drying and heating, so that the solid material can be well bonded to the substrate. In the coating process, in order to make the coating liquid evenly coated on the substrate, the coating liquid needs to be degassed. Utility Model Content

[0003] In view of this, the embodiments of the present application hope to provide a coating device and a battery production line, which are intended to reduce the gas content in the coating liquid, thereby facilitating improving the uniformity of coating the coating liquid on the substrate.

[0004] In a first aspect, an embodiment of the present application provides a coating device, comprising:

[0005] A container for storing the coating liquid, a syringe pump and a coating blade, wherein the container is connected to the syringe pump through a delivery channel, and the syringe pump is connected to the coating blade;

[0006] The degassing unit is arranged on the conveying channel.

[0007] The coating device provided in the embodiment of the present application removes gas from the coating liquid through a degassing unit and uses a syringe pump to transport the coating liquid, which is beneficial to reducing the gas content in the coating liquid and improving the uniformity of coating the coating liquid on the substrate.

[0008] In some embodiments, the degassing unit includes a degassing module and a vacuum device; the degassing module includes a shell and a hollow fiber membrane bundle, the shell is provided with a liquid inlet, a liquid outlet and an exhaust port; the hollow fiber membrane bundle is arranged in the shell for degassing the coating liquid; the shell and the hollow fiber membrane bundle jointly define a flow channel and an air channel that are not connected to each other, the flow channel connects the liquid inlet and the liquid outlet, the air channel connects with the exhaust port, and the vacuum device is connected with the exhaust port. In this arrangement, the gas in the coating liquid is discharged from the air channel under the negative pressure vacuum condition provided by the vacuum device.

[0009] In some embodiments, the internal pipe of the hollow fiber membrane bundle forms the air channel, and the flow channel is defined between the circumferential outer surface of the hollow fiber membrane bundle and the inner surface of the outer shell; or, the internal pipe of the hollow fiber membrane bundle forms the flow channel, and the air channel is defined between the circumferential outer surface of the hollow fiber membrane bundle and the inner surface of the outer shell.

[0010] In the embodiment where the inner pipe of the hollow fiber membrane bundle is used as the flow channel for the coating liquid to circulate, the contact area between the coating liquid and the hollow fiber membrane bundle is large, which is conducive to the effective degassing of the coating liquid during the flow of the inner pipe of the hollow fiber membrane bundle. In the embodiment where the flow channel is defined between the circumferential outer surface of the hollow fiber membrane bundle and the inner surface of the shell, the flow resistance of the coating liquid in the flow channel is relatively small, and it can have a large flow speed and flow rate.

[0011] In some embodiments, the coating device further includes a liquid valve, which is disposed on the delivery channel between the degassing unit and the injection pump and is used to open or close the delivery channel.

[0012] When the injection pump needs to be fed with liquid, the liquid valve opens to deliver the coating liquid degassed by the degassing unit to the injection pump; when the injection pump does not need to be fed with liquid, the liquid valve closes and the coating liquid delivery between the degassing unit and the injection pump stops. This setting is conducive to controlling the delivery state of the coating liquid between the degassing unit and the injection pump.

[0013] In some embodiments, the coating device includes a buffer container, which is disposed on the delivery channel between the liquid valve and the injection pump and is used to store the coating liquid degassed by the degassing unit.

[0014] The buffer container can reduce the unevenness of the flow and reduce inertia loss, thereby protecting the pump and the delivery pipeline from damage caused by rapid changes in pressure. The setting of the buffer container can also improve the stability of the coating device. The buffer container helps to reduce the water hammer effect, avoid the generation of excessive flow, ensure the hydraulic stability of the system, and prevent the injection pump from frequently opening or closing due to frequent changes in pressure. In addition, the setting of the buffer container can also reduce the fluctuation amplitude. The buffer container can effectively reduce the hydraulic shock and liquid oscillation of the delivery pipeline and avoid fluctuations in the coating device.

[0015] In some embodiments, the coating device further includes a liquid valve, which is disposed on the delivery channel between the degassing unit and the buffer container and is used to open or close the delivery channel.

[0016] When the buffer container needs to be filled with liquid, the liquid valve opens to transport the coating liquid degassed by the degassing unit to the buffer container; when the buffer container does not need to be filled with liquid, the liquid valve closes and the coating liquid transportation between the degassing unit and the buffer container stops. This setting is conducive to controlling the transportation state of the coating liquid between the degassing unit and the buffer container.

[0017] In some embodiments, the coating device includes a liquid pump, which is disposed on the delivery channel between the buffer container and the container, and is used to pump the coating liquid in the container to the buffer container.

[0018] With such an arrangement, the liquid pump is used to provide power for conveying the coating liquid in the container to the buffer container. In addition, the liquid pump is arranged on the conveying channel between the buffer container and the container to provide power for conveying the coating liquid from the container to the buffer container. This part of power does not need to be provided by the injection pump, thereby reducing the power performance requirements for the injection pump.

[0019] In some embodiments, the liquid pump is disposed on the delivery channel between the container and the degassing unit.

[0020] With this arrangement, the coating liquid first flows through the liquid pump and then flows through the degassing unit. In this way, even if the liquid pump introduces air, it can be degassed through the subsequent degassing unit, which can further reduce the gas content of the coating liquid in the buffer container.

[0021] In some embodiments, the coating device further includes a liquid level sensor, which is connected to the buffer container and is used to detect the liquid level in the buffer container.

[0022] In this way, the setting of the liquid level sensor can improve the adjustment accuracy of the coating device. The liquid level sensor can provide real-time feedback on changes in factors such as pressure and liquid level, effectively ensuring the smooth output of the flow rate in the delivery channel. In addition, the liquid level sensor can issue an alarm when the liquid level is too high or too low, ensuring the safety of the coating liquid during delivery and processing, thereby improving the safety of the coating device.

[0023] In a second aspect, an embodiment of the present application provides a battery production line, comprising the coating device described in any embodiment of the present application.

[0024] The battery production line provided in the embodiment of the present application adopts the above-mentioned coating device to remove the gas in the coating liquid, so that the coating liquid is evenly coated on the substrate, thereby improving the battery production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a coating device according to an embodiment of the present application;

[0026] Figure 2 A schematic diagram of a coating device according to another embodiment of the present application;

[0027] Figure 3 is a schematic diagram of a degassing module according to an embodiment of the present application;

[0028] Figure 4 This is a schematic diagram of a degassing module according to another embodiment of the present application.

[0029] Description of Reference Numerals

[0030] 1. Container; 2. Degassing unit; 3. Degassing module; 4. Vacuum device; 5. Liquid valve; 6. Delivery channel; 7. Injection pump; 8. Coating knife head; 9. Liquid pump; 10. Buffer container; 11. Liquid level sensor; 31. Housing; 32. Hollow fiber membrane bundle; 33. Liquid inlet; 34. Liquid outlet; 35. Exhaust port. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in the utility model will not be described separately.

[0033] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the specific corresponding schematic diagrams, which may be the left and right directions in normal use or not.

[0034] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0035] Coating is an essential process in the battery production process and a key process that directly affects battery safety, capacity, consistency and other performance. Coating is to evenly, continuously or intermittently coat the prepared coating liquid on the substrate, and control the coating thickness according to the process requirements to meet the weight requirements. At the same time, the solvent in the coating liquid spread on the substrate is removed by drying and heating, so that the solid material can be well bonded to the substrate. In the coating process, in order to make the coating liquid evenly coated on the substrate, the coating liquid needs to be degassed.

[0036] In the related art, the coating mechanism uses vacuum to degas the coating liquid in the buffer tank, and pressurizes the degassed coating liquid with compressed air to transfer the coating liquid from the buffer tank to the replenishing tank. In this process, a part of the high-pressure compressed gas will dissolve into the coating liquid, which in turn increases the gas content in the coating liquid.

[0037] In view of the above problems, the embodiment of the present application provides a coating device, including a container for storing a coating liquid, a syringe pump, a coating blade, a conveying channel and a degassing unit, wherein the container is connected to the syringe pump through the conveying channel, the syringe pump is connected to the coating blade, and the degassing unit is arranged on the conveying channel. In this way, the coating liquid is degassed by the degassing unit, and the coating liquid is conveyed by the syringe pump, which is conducive to reducing the gas content in the coating liquid and improving the uniformity of the coating liquid applied on the substrate.

[0038] The present application also provides a battery production line, including the above-mentioned coating device. For example, in some embodiments, the coating blade can be used to apply the coating liquid on the battery pole piece. In other embodiments, the coating blade can also be used to apply the precursor liquid on the battery substrate.

[0039] In the following embodiments, for the convenience of description, a battery production line according to an embodiment of the present application is taken as an example.

[0040] The present application embodiment provides a coating device, see Figure 1 The coating device includes a container 1 for storing the coating liquid, an injection pump 7, a coating blade 8, a conveying channel 6 and a degassing unit 2. The container 1 is connected to the injection pump 7 through the conveying channel 6, the injection pump 7 is connected to the coating blade 8, and the degassing unit 2 is arranged on the conveying channel 6.

[0041] The coating liquid can be a positive electrode coating liquid or a negative electrode coating liquid of a lithium-ion battery, or a precursor liquid of each functional layer in a perovskite battery.

[0042] The positive electrode coating solution of the lithium ion battery may include a positive electrode active material, a conductive agent (such as carbon black), a binder (such as polyvinyl fluoride, polyvinyl alcohol) and a solvent (such as N-methylpyrrolidone, dimethylformamide, ethylene glycol, etc.).

[0043] The negative electrode coating solution of the lithium ion battery may include a negative electrode active material, a conductive agent (such as carbon black), a binder (such as polyvinylidene fluoride, polyvinyl alcohol) and a solvent (such as N-methylpyrrolidone, dimethylformamide, ethylene glycol, etc.).

[0044] The positive electrode active material in the positive electrode coating solution of lithium-ion batteries is the key component for storing energy in lithium-ion batteries. Conductive agents can improve the conductivity of the electrode, while binders can make the various components stick together firmly, so that the positive electrode material is more evenly distributed on the electrode. Solvents are the medium that dissolves the required materials and adjusts their viscosity. The adjusted coating solution can be better coated on the electrode, ensuring that a thin film is evenly coated on the electrode surface, which helps ion transmission and electrode reaction during charging and discharging.

[0045] The negative electrode active material in the negative electrode coating solution of lithium-ion batteries is also a key component for storing energy in lithium-ion batteries. The conductive agent and binder play the same role in the negative electrode coating solution as in the positive electrode coating solution. The conductive agent and binder in the negative electrode coating solution make the negative electrode material evenly distributed on the electrode. The solvent is also a medium to dissolve the required materials and adjust their viscosity, ensuring that a thin film is evenly coated on the surface of the negative electrode, which helps to improve the transmission performance and electrode reaction of the electrode during charging and discharging.

[0046] The precursor solution of each functional layer in the perovskite battery can be: a hole transport layer precursor solution, or a perovskite layer precursor solution, or an electron transport layer precursor solution, or a passivation layer precursor solution, etc.

[0047] The coating blade 8 is an important part of the coating device. The coating blade 8 evenly coats the coating liquid on the surface of the substrate by slit extrusion, and has the characteristics of good coating effect and adjustable coating thickness. The coating blade 8 can be made of stainless steel, nylon, carbon steel, hard alloy, etc.

[0048] The injection pump 7 is an injection device that can uniformly and continuously deliver the coating liquid, strictly control the amount of the coating liquid, reasonably adjust the injection speed of the coating liquid, and continuously infuse the coating liquid. The injection pump 7 provides a driving force for the coating liquid to flow in the delivery channel 6, and delivers the coating liquid pump 9 to the coating knife head 8 connected thereto.

[0049] The degassing unit 2 is used to remove gas from the coating liquid. In some embodiments, the number of the degassing unit 2 can be one or more.

[0050] The conveying channel 6 is used to convey the coating liquid from the container 1 to the coating blade 8. The conveying channel 6 has good impact resistance and heat resistance, can effectively isolate the external environment, and ensure the pressure and temperature stability in the conveying channel 6; in addition, the conveying channel 6 has good acid and alkali resistance.

[0051] The coating device of the embodiment of the present application degasses the coating liquid through the degassing unit 2, and pumps the degassed coating liquid 9 to the coating head 8 under the action of the injection pump 7. Degassing the coating liquid through the degassing unit 2 and using the injection pump 9 to transport the coating liquid is beneficial to reducing the gas content in the coating liquid and improving the uniformity of the coating liquid on the substrate.

[0052] In some embodiments, see Figure 3 The degassing unit 2 includes a degassing module 3 and a vacuum device 4. The degassing module 3 includes a shell 31 and a hollow fiber membrane bundle 32. The shell is provided with a liquid inlet 33, a liquid outlet 34 and an exhaust port 35. The hollow fiber membrane bundle 32 is arranged in the shell 31 for degassing the coating liquid. The shell 31 and the hollow fiber membrane bundle 32 jointly define a flow channel and an air channel that are not connected to each other. The flow channel is connected to the liquid inlet 33 and the liquid outlet 34, and the air channel is connected to the exhaust port 35. The vacuum device 4 is connected to the exhaust port 35.

[0053] The degassing module 3 is used to remove gas from the coating liquid flowing through the degassing module 3 .

[0054] The vacuum device 4 is used to extract non-condensable gas to keep the degassing module 3 in a vacuum state. The non-condensable gas mainly comes from: air dissolved in the coating liquid and air entering the degassing module 3 due to sealing reasons.

[0055] The housing 31 is the appearance structure of the degassing module 3 .

[0056] The hollow fiber membrane bundle 32 is composed of one or more hollow fiber membranes, which are self-supporting membranes with a hollow inner cavity and are fiber-shaped. The hollow fiber membranes can be fiber filaments with a hollow inner cavity made of polysulfone or dimethylacetamide, and have selective permeability.

[0057] Exemplarily, the hollow fiber membrane includes at least one of a porous membrane and a microporous membrane. The hollow fiber membrane may be made of polyolefin resin, silicone resin, fluororesin, and the like.

[0058] The coating liquid enters the flow channel from the liquid inlet 33 of the degassing module 3, and the gas in the coating liquid in the flow channel permeates from the micropores on the hollow fiber membrane under the action of the static pressure difference, and the permeated gas enters the airway, wherein the airway discharges the gas and maintains a negative pressure vacuum state under the action of the vacuum device 4. In other words, the coating liquid flows in the flow channel, the degassed gas flows in the airway, and the coating liquid does not enter the airway.

[0059] With such arrangement, the gas in the coating liquid is discharged from the air passage under the negative pressure vacuum condition provided by the vacuum device 4 .

[0060] In some embodiments, see Figure 3, the internal pipe of the hollow fiber membrane bundle 32 forms an air channel, and the flow channel is defined between the circumferential outer surface of the hollow fiber membrane bundle 32 and the inner surface of the shell 31; or, refer to Figure 4 The internal pipes of the hollow fiber membrane bundle 32 form a flow channel, and the circumferential outer surface of the hollow fiber membrane bundle 32 and the inner surface of the shell 31 define an air outlet.

[0061] It should be noted that the internal pipe of the hollow fiber membrane bundle 32 refers to the hollow inner cavity in the hollow fiber membrane, and the channel formed between the circumferential outer surface of the hollow fiber membrane bundle 32 and the inner surface of the outer shell 31 refers to the channel formed between the circumferential outer surface of the hollow fiber membrane and the inner surface of the outer shell 31.

[0062] In the embodiment where the internal pipe of the hollow fiber membrane bundle 32 serves as a flow channel for the coating liquid to circulate, the contact area between the coating liquid and the hollow fiber membrane bundle 32 is large, which is conducive to the effective degassing of the coating liquid during the flow of the internal pipe of the hollow fiber membrane bundle 32. In the embodiment where a flow channel is defined between the circumferential outer surface of the hollow fiber membrane bundle 32 and the inner surface of the shell 31, the flow resistance of the coating liquid in the flow channel is relatively small, and it can have a large flow speed and flow rate. In some embodiments, the coating device also includes a liquid valve 5, which is arranged on the delivery channel 6 between the degassing unit 2 and the injection pump 7, and is used to open or close the delivery channel 6.

[0063] The liquid valve 5 is arranged on the conveying channel 6 between the degassing unit 2 and the injection pump 7. When the injection pump 7 needs to be supplied with liquid, the liquid valve 5 is opened to convey the coating liquid degassed by the degassing unit 2 to the injection pump 7; when the injection pump 7 does not need to be supplied with liquid, the liquid valve 5 is closed, and the conveying of the coating liquid between the degassing unit 2 and the injection pump 7 is stopped. The liquid valve 5 is arranged on the conveying channel 6 between the degassing unit 2 and the injection pump 7, which is conducive to controlling the conveying of the coating liquid between the degassing unit 2 and the injection pump 7.

[0064] In some embodiments, the liquid valve 5 includes a valve seat and a valve core disposed in the valve seat, and the opening of the valve core is adjustable to adjust the flow rate flowing through the liquid valve 5 .

[0065] With such an arrangement, the flow rate of the coating liquid delivered to the injection pump 7 can be controlled and the flow rate of the coating liquid delivered to the injection pump 7 can be adjusted.

[0066] In some embodiments, see Figure 2 The coating device includes a buffer container 10, which is arranged on the delivery channel 6 between the liquid valve 5 and the injection pump 7, and is used to store the coating liquid degassed by the degassing unit 2.

[0067] The buffer container 10 is used to store the coating liquid after degassing by the degassing unit 2, and to provide the coating liquid supply for the injection pump 7. The buffer container 10 is arranged on the conveying channel 6 between the liquid valve 5 and the injection pump 7 to protect the coating device. The buffer container 10 can reduce the unevenness of the flow rate and reduce the inertia loss, thereby protecting the pump and the conveying pipeline from damage caused by rapid changes in pressure. The setting of the buffer container 10 can also improve the stability of the coating device. The buffer container 10 helps to reduce the water hammer effect, avoid the generation of excessive flow, ensure the hydraulic stability of the system, and prevent the injection pump 7 from being frequently opened or closed due to frequent changes in pressure. In addition, the setting of the buffer container 10 can also reduce the fluctuation amplitude. The buffer container 10 can effectively reduce the hydraulic shock and liquid oscillation of the conveying pipeline, and avoid fluctuations in the coating device.

[0068] In some embodiments, the coating device further includes a liquid valve 5 , which is disposed on the delivery channel 6 between the degassing unit 2 and the buffer container 10 , and is used to open or close the delivery channel 6 .

[0069] The liquid valve 5 is arranged on the conveying channel 6 between the degassing unit 2 and the buffer container 10. When the buffer container 10 needs to be supplied with liquid, the liquid valve 5 is opened to convey the coating liquid degassed by the degassing unit 2 to the buffer container 10; when the buffer container 10 does not need to be supplied with liquid, the liquid valve 5 is closed, and the conveying of the coating liquid between the degassing unit 2 and the buffer container 10 is stopped. The liquid valve 5 is arranged on the conveying channel 6 between the degassing unit 2 and the buffer container 10, which is conducive to controlling the conveying of the coating liquid between the degassing unit 2 and the buffer container 10.

[0070] In some embodiments, the coating device includes a liquid pump 9, which is arranged on the conveying channel 6 between the buffer container 10 and the container 1, and is used to pump the coating liquid in the container 1 to the buffer container 10. In this way, the liquid pump 9 provides power for conveying the coating liquid in the container 1 to the buffer container 10; in addition, the liquid pump 9 is arranged on the conveying channel 6 between the buffer container 10 and the container 1, and provides power for conveying the coating liquid from the container 1 to the buffer container 10. This part of the power does not need to be provided by the injection pump 7, thereby reducing the power performance requirements of the injection pump 7.

[0071] The liquid pump 9 applies mechanical power to the delivery of liquid, so that the liquid can flow smoothly from the low-pressure area to the high-pressure area.

[0072] The specific position of the liquid pump 9 is not limited. For example, in some embodiments, the liquid pump 9 is disposed on the conveying channel 6 between the degassing unit 2 and the buffer container 10. In this way, the power required in the process of conveying the coating liquid from the container 1 to the degassing unit 2 and then from the degassing unit 2 to the buffer container 10 is provided by the liquid pump 9. This part of the power does not need to be provided by the injection pump 7. The injection pump 7 only needs to provide the power for conveying the coating liquid from the buffer container 10 to the injection pump 7, thereby reducing the power performance requirements of the injection pump 7.

[0073] In some embodiments, the liquid pump 9 is disposed on the conveying channel 6 between the container 1 and the degassing unit 2. In this arrangement, the coating liquid first flows through the liquid pump 9 and then flows through the degassing unit 2, so that even if the liquid pump 9 introduces air, it can be degassed by the subsequent degassing unit 2, so that the gas content of the coating liquid in the buffer container 10 can be further reduced.

[0074] In some embodiments, the coating device further includes a liquid level sensor 11 , which is connected to the buffer container 10 and is used to detect the liquid level in the buffer container 10 .

[0075] The liquid level sensor 11 is a sensor for measuring the liquid level. The type of the liquid level sensor 11 is not limited, for example, it can be a float type liquid level transmitter, a magnetic liquid level transmitter, a immersion type liquid level transmitter, an electric internal float liquid level transmitter, an electric float liquid level transmitter, a capacitive liquid level transmitter, a magnetostrictive liquid level transmitter, a servo liquid level transmitter, an ultrasonic liquid level transmitter, a radar liquid level transmitter, etc. The liquid level sensor 11 is based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid, and uses an isolated diffused silicon sensitive element or a ceramic capacitor pressure sensitive sensor to convert the static pressure into an electrical signal, which is then converted into a standard electrical signal after temperature compensation and linear correction.

[0076] The setting of the liquid level sensor 11 can improve the adjustment accuracy of the coating device. The liquid level sensor 11 can provide real-time feedback on changes in factors such as pressure and liquid level, effectively ensuring the smooth output of the flow rate of the delivery channel 6. In addition, the liquid level sensor 11 can issue an alarm when the liquid level is too high or too low, ensuring the safety of the coating liquid during transportation and processing, thereby improving the safety of the coating device.

[0077] In the description of the present application, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine the different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A coating device, characterized in that: include: A container for storing the coating liquid, a syringe pump and a coating blade, wherein the container is connected to the syringe pump through a delivery channel, and the syringe pump is connected to the coating blade; The degassing unit is arranged on the conveying channel.

2. The coating device according to claim 1, characterized in that: The degassing unit includes a degassing module and a vacuum device; the degassing module includes an outer shell and a hollow fiber membrane bundle, the outer shell is provided with a liquid inlet, a liquid outlet and an exhaust port; the hollow fiber membrane bundle is arranged in the outer shell for degassing the coating liquid; the outer shell and the hollow fiber membrane bundle jointly define a flow channel and an air channel that are not connected to each other, the flow channel connects the liquid inlet and the liquid outlet, the air channel is connected to the exhaust port, and the vacuum device is connected to the exhaust port.

3. The coating device according to claim 2, characterized in that: The internal pipe of the hollow fiber membrane bundle forms the air channel, and the flow channel is defined between the circumferential outer surface of the hollow fiber membrane bundle and the inner surface of the outer shell; or, the internal pipe of the hollow fiber membrane bundle forms the flow channel, and the air channel is defined between the circumferential outer surface of the hollow fiber membrane bundle and the inner surface of the outer shell.

4. The coating device according to claim 1, characterized in that: The coating device further comprises a liquid valve, which is arranged on the delivery channel between the degassing unit and the injection pump and is used to open or close the delivery channel.

5. The coating device according to claim 1, characterized in that: The coating device includes a buffer container, which is arranged on the conveying channel between the degassing unit and the injection pump and is used to store the coating liquid degassed by the degassing unit.

6. The coating device according to claim 5, characterized in that: The coating device further comprises a liquid valve, which is arranged on the conveying channel between the degassing unit and the buffer container and is used to open or close the conveying channel.

7. The coating device according to claim 5, characterized in that: The coating device comprises a liquid pump, which is arranged on the conveying channel between the buffer container and the container and is used to pump the coating liquid in the container to the buffer container.

8. The coating device according to claim 7, characterized in that: The liquid pump is arranged on the conveying channel between the container and the degassing unit.

9. The coating device according to claim 5, characterized in that: The coating device further comprises a liquid level sensor, which is connected to the buffer container and is used to detect the liquid level in the buffer container.

10. A battery production line, characterized in that: The coating device comprises the coating device according to any one of claims 1 to 9.

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