Coating device and battery production line

Abstract

Disclosed are a coating device and a battery production line The coating device comprises a container (1) for storing a coating liquid, an injection pump (7), a coating die head (8), a conveying channel (6) and a degassing unit (2), wherein the container (1) is connected to the injection pump (7) via the conveying channel (6), the injection pump (7) is connected to the coating die head (8), and the degassing unit (2) is arranged on the conveying channel (6). Gas removal is performed on the coating liquid by means of the degassing unit (2), and the coating liquid is conveyed by using the injection pump (7), so that the gas content in the coating liquid is reduced, thus improving the uniformity for coating substrates with the coating liquid.

Description

A coating apparatus and battery production line

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202420959820.2, filed on May 6, 2024, entitled “A Coating Apparatus and Battery Production Line”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure pertains to the field of coating technology, and particularly relates to a coating apparatus and a battery production line. Background Technology

[0004] Coating is the process of uniformly, continuously, or intermittently applying a prepared coating solution onto a substrate. The coating thickness is controlled according to process requirements to achieve the desired weight. Simultaneously, drying and heating remove the solvent from the coating solution spread on the substrate, allowing the solid material to adhere well to the substrate. In the coating process, degassing of the coating solution is necessary to ensure uniform application to the substrate. Summary of the Invention

[0005] In view of this, the present disclosure aims to provide a coating apparatus and a battery production line, which are designed to reduce the gas content in the coating liquid and improve the uniformity of the coating liquid on the substrate.

[0006] In a first aspect, embodiments of this disclosure provide a coating apparatus, comprising:

[0007] The container for storing the coating liquid, the injection pump, and the coating head are connected. The container and the injection pump are connected through a delivery channel, and the injection pump is connected to the coating head.

[0008] The degassing unit is located on the conveying channel.

[0009] The coating apparatus provided in this embodiment removes gas from the coating liquid through a degassing unit and uses an injection pump to deliver the coating liquid, which helps to reduce the gas content in the coating liquid and improve the uniformity of the coating liquid on the substrate.

[0010] In some embodiments, the degassing unit includes a degassing module and a vacuum device. The degassing module includes a housing and a hollow fiber membrane bundle. The housing is provided with a liquid inlet, a liquid outlet, and an exhaust port. The hollow fiber membrane bundle is disposed inside the housing for degassing the coating liquid. The housing and the hollow fiber membrane bundle together define a non-communicating flow channel and a gas channel. The flow channel connects the liquid inlet and the liquid outlet, and the gas channel connects to the exhaust port. The vacuum device is connected to the exhaust port. With this configuration, the gas in the coating liquid is discharged from the gas channel under the negative pressure vacuum provided by the vacuum device.

[0011] In some embodiments, the internal channels of the hollow fiber membrane bundle form an air passage, and an outlet passage is defined between the circumferential outer surface of the hollow fiber membrane bundle and the inner surface of the outer shell; or, the internal channels of the hollow fiber membrane bundle form an outlet passage, and an outlet passage is defined between the circumferential outer surface of the hollow fiber membrane bundle and the inner surface of the outer shell.

[0012] In embodiments where the internal channels of the hollow fiber membrane bundle serve as the flow channels for the coating liquid, the contact area between the coating liquid and the hollow fiber membrane bundle is relatively large, which is beneficial for the coating liquid to effectively degas during its flow through the internal channels of the hollow fiber membrane bundle. In embodiments where the flow channel is defined between the circumferential outer surface of the hollow fiber membrane bundle and the inner surface of the outer shell, the flow resistance of the coating liquid in the flow channel is relatively small, allowing for a larger flow velocity and flow rate.

[0013] In some embodiments, the coating apparatus further includes a liquid valve disposed on the delivery channel between the degassing unit and the injection pump, for opening or closing the delivery channel.

[0014] When the syringe pump needs liquid inlet, the liquid valve opens, delivering the coating liquid, degassed by the degassing unit, to the syringe pump; when the syringe pump does not need liquid inlet, the liquid valve closes, stopping the delivery of coating liquid between the degassing unit and the syringe pump. This setup facilitates control over the delivery of coating liquid between the degassing unit and the syringe pump.

[0015] In some embodiments, the coating apparatus includes a buffer container disposed on the delivery channel between the liquid valve and the injection pump for storing the coating liquid after degassing by the degassing unit.

[0016] Buffer containers reduce flow unevenness and inertial losses, thereby protecting pumps and delivery pipelines from damage caused by rapid pressure changes. The inclusion of buffer containers also improves the stability of the coating unit. Buffer containers help reduce water hammer effects, prevent excessive flow, ensure hydraulic stability of the system, and prevent the injection pump from frequently starting or stopping due to frequent pressure changes. Furthermore, buffer containers can reduce fluctuation amplitude. Buffer containers effectively reduce hydraulic shock and liquid oscillation in the delivery pipeline, preventing fluctuations in the coating unit.

[0017] In some embodiments, the coating apparatus further includes a liquid valve disposed on the conveying channel between the degassing unit and the buffer container, for opening or closing the conveying channel.

[0018] When the buffer container needs to be filled with liquid, the liquid valve opens, delivering 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, stopping the delivery of coating liquid between the degassing unit and the buffer container. This setup facilitates control over the delivery of coating liquid between the degassing unit and the buffer container.

[0019] In some embodiments, the coating apparatus includes a liquid pump disposed on a delivery channel between a buffer container and a container, for pumping coating liquid from the container to the buffer container.

[0020] With this setup, the liquid pump provides the power to transport the coating liquid from the container to the buffer container. In addition, the liquid pump is located in the transport channel between the buffer container and the container to provide the power to transport the coating liquid from the container to the buffer container. This power does not need to be provided by the injection pump, thus reducing the power performance requirements of the injection pump.

[0021] In some embodiments, a liquid pump is disposed on the delivery channel between the container and the degassing unit.

[0022] With this configuration, the coating liquid first flows through the liquid pump and then through the degassing unit. In this way, even if air is introduced by the liquid pump, it can be degassed by the subsequent degassing unit, which can further reduce the gas content of the coating liquid in the buffer container.

[0023] In some embodiments, the coating apparatus further includes a liquid level sensor connected to a buffer container for detecting the liquid level in the buffer container.

[0024] This configuration improves the adjustment accuracy of the coating unit by incorporating a liquid level sensor. The sensor provides real-time feedback on changes in pressure, liquid level, and other factors, effectively ensuring a stable flow rate in the delivery channel. Furthermore, the sensor can issue alarms when the liquid level is too high or too low, ensuring safety during the delivery and handling of the coating liquid, thereby enhancing the overall safety of the coating unit.

[0025] Secondly, embodiments of this disclosure provide a battery production line, including a coating apparatus according to any embodiment of this disclosure.

[0026] The battery production line provided in this embodiment uses the coating device described above to remove gas from the coating liquid, so that the coating liquid is uniformly coated on the substrate, thereby improving battery production efficiency. Attached Figure Description

[0027] Figure 1 is a schematic diagram of a coating apparatus according to an embodiment of the present disclosure;

[0028] Figure 2 is a schematic diagram of a coating apparatus according to another embodiment of the present disclosure;

[0029] Figure 3 is a schematic diagram of a degassing module according to an embodiment of the present disclosure;

[0030] Figure 4 is a schematic diagram of a degassing module according to another embodiment of this disclosure.

[0031] Explanation of reference numerals in the attached drawings: 1. Container; 2. Degassing unit; 3. Degassing module; 4. Vacuum device; 5. Liquid valve; 6. Delivery channel; 7. Injection pump; 8. Coating blade; 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 Implementation

[0032] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this disclosure.

[0033] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this disclosure will not be described separately.

[0034] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0035] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0036] Coating is an essential step in battery production and a key process that directly affects battery safety, capacity, consistency, and other performance characteristics. Coating involves uniformly, continuously, or intermittently applying a prepared coating solution to a substrate, controlling the coating thickness according to process requirements to achieve the desired weight. Simultaneously, drying and heating remove the solvent from the coating solution spread on the substrate, allowing the solid material to adhere well to the substrate. In the coating process, degassing is necessary to ensure uniform coating of the solution onto the substrate.

[0037] In related technologies, the coating mechanism uses vacuuming to degas the coating liquid in the buffer tank, and then pressurizes the degassed coating liquid with compressed air to move it from the buffer tank to the replenishment tank. During this process, some of the high-pressure compressed gas dissolves into the coating liquid, actually increasing the gas content in the coating liquid.

[0038] In view of the above problems, this disclosure provides a coating apparatus, including a container for storing coating liquid, an injection pump, a coating blade, a delivery channel, and a degassing unit. The container and the injection pump are connected through the delivery channel, the injection pump is connected to the coating blade, and the degassing unit is disposed on the delivery channel. Thus, by removing gas from the coating liquid through the degassing unit and using an injection pump to deliver the coating liquid, it is beneficial to reduce the gas content in the coating liquid and improve the uniformity of the coating liquid on the substrate.

[0039] This disclosure also provides a battery production line including the coating apparatus described above. Exemplarily, in some embodiments, the coating blade can be used to coat a coating liquid onto a battery electrode. In other embodiments, the coating blade can also be used to coat a precursor liquid onto a battery substrate.

[0040] In the following embodiments, for ease of explanation, a battery production line according to an embodiment of the present disclosure will be used as an example for illustration.

[0041] This disclosure provides a coating apparatus. Referring to Figure 1, the coating apparatus includes a container 1 for storing coating liquid, an injection pump 7, a coating blade 8, a delivery channel 6, and a degassing unit 2. The container 1 is connected to the injection pump 7 through the delivery channel 6, the injection pump 7 is connected to the coating blade 8, and the degassing unit 2 is disposed on the delivery channel 6.

[0042] The coating solution can be the positive electrode coating solution or negative electrode coating solution of a lithium-ion battery, or it can be the precursor solution of each functional layer in a perovskite battery.

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

[0044] The negative electrode coating solution of a lithium-ion battery may consist of negative electrode active material, conductive agent (such as carbon black), binder (such as polyvinylidene fluoride, polyvinyl alcohol) and solvent (such as N-methylpyrrolidone, dimethylformamide, ethylene glycol, etc.).

[0045] The positive electrode active material in the positive electrode coating solution of a lithium-ion battery is a key component for energy storage. Conductive agents improve the conductivity of the electrode, while binders firmly bond the various components together, ensuring a more uniform distribution of the positive electrode material on the electrode. Solvents are the medium that dissolves the required materials and adjusts their viscosity; the adjusted coating solution allows for better coating onto the electrode, ensuring a uniform thin film on the electrode surface, which facilitates ion transport and electrode reactions during charging and discharging.

[0046] The negative electrode active material in the negative electrode coating solution of a lithium-ion battery is also a key component for energy storage. The conductive agents and binders in the negative electrode coating solution play the same role as in the positive electrode coating solution, ensuring the uniform distribution of the negative electrode material on the electrode. The solvent also serves as a medium to dissolve the required materials and adjust their viscosity, ensuring a uniform thin film coating on the negative electrode surface. This helps improve the electrode's transport performance and electrode reactions during charging and discharging.

[0047] The precursor solutions for each functional layer in a perovskite solar cell can be: hole transport layer precursor solution, perovskite layer precursor solution, electron transport layer precursor solution, or passivation layer precursor solution, etc.

[0048] The coating head 8 is a crucial component of the coating apparatus. It applies the coating liquid evenly to the substrate surface via slit extrusion, offering advantages such as excellent coating effect and adjustable coating thickness. The coating head 8 can be made of materials such as stainless steel, nylon, carbon steel, or cemented carbide.

[0049] The syringe pump 7 is an injection device that can uniformly and continuously deliver coating liquid, strictly control the amount of coating liquid used, reasonably adjust the injection speed of coating liquid, and continuously infuse coating liquid. The syringe pump 7 provides driving force for the flow of coating liquid in the delivery channel 6, and delivers the coating liquid pump 9 to the coating blade head 8 connected to it.

[0050] The degassing unit 2 is used to remove gas from the coating liquid. In some embodiments, there may be one or more degassing units 2.

[0051] The conveying channel 6 is used to convey the coating liquid from the container 1 to the coating head 8. The conveying channel 6 has good impact resistance and heat resistance, effectively isolates the external environment, and ensures stable pressure and temperature within the conveying channel 6; in addition, the conveying channel 6 has good acid and alkali resistance.

[0052] The coating apparatus of this embodiment removes gas from the coating liquid through the degassing unit 2. Under the action of the injection pump 7, the degassed coating liquid is pumped 9 to the coating head 8. The degassing unit 2 removes gas from the coating liquid, and the injection pump 9 is used to deliver the coating liquid, which helps to reduce the gas content in the coating liquid and improve the uniformity of the coating liquid on the substrate.

[0053] In some embodiments, referring to FIG3, the degassing unit 2 includes a degassing module 3 and a vacuum device 4. The degassing module 3 includes a housing 31 and a hollow fiber membrane bundle 32. The housing is provided with a liquid inlet 33, a liquid outlet 34 and an exhaust port 35. The hollow fiber membrane bundle 32 is disposed inside the housing 31 for degassing the coating liquid. The housing 31 and the hollow fiber membrane bundle 32 together define a non-communicating flow channel and an air channel. The flow channel connects the liquid inlet 33 and the liquid outlet 34, and the air channel connects to the exhaust port 35. The vacuum device 4 is connected to the exhaust port 35.

[0054] The degassing module 3 is used to remove gas from the coating liquid flowing through the degassing module 3.

[0055] Vacuum device 4 is used to extract non-condensable gases, keeping degassing module 3 in a vacuum state at all times. The non-condensable gases mainly come from: air dissolved in the coating liquid and air that enters degassing module 3 due to sealing issues.

[0056] The outer casing 31 is the external structure of the degassing module 3.

[0057] The hollow fiber membrane bundle 32 is composed of one or more hollow fiber membranes. A hollow fiber membrane is a membrane with a fibrous shape, self-supporting function, and a hollow inner cavity. The hollow fiber membrane can be made of polysulfone or dimethylacetamide as raw materials to form hollow inner filaments, and has selective permeation characteristics.

[0058] For example, a hollow fiber membrane includes at least one of a porous membrane and a microporous membrane. The material of the hollow fiber membrane can be polyolefin resin, silicone resin, fluoropolymer resin, etc.

[0059] The coating liquid enters the flow channel through the inlet 33 of the degassing module 3. Under the action of static pressure difference, the gas in the coating liquid in the flow channel permeates through the micropores on the hollow fiber membrane. The permeated gas enters the gas channel, which is maintained under negative pressure vacuum by the vacuum device 4 to expel the gas. In other words, the coating liquid flows in the flow channel, and the degassed gas flows in the gas channel, while the coating liquid does not enter the gas channel.

[0060] With this setup, the gas in the coating liquid is discharged from the gas passage under the negative pressure vacuum provided by the vacuum device 4.

[0061] In some embodiments, referring to FIG3, the internal channels of the hollow fiber membrane bundle 32 form an air passage, and an outlet passage is defined between the circumferential outer surface of the hollow fiber membrane bundle 32 and the inner surface of the outer shell 31; or, referring to FIG4, the internal channels of the hollow fiber membrane bundle 32 form an outlet passage, and an outlet passage is defined between the circumferential outer surface of the hollow fiber membrane bundle 32 and the inner surface of the outer shell 31.

[0062] It should be noted that the internal channel 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.

[0063] In embodiments where the internal channels of the hollow fiber membrane bundle 32 serve as the flow channels for the coating liquid, the contact area between the coating liquid and the hollow fiber membrane bundle 32 is relatively large, which is beneficial for the coating liquid to effectively degas during its flow through the internal channels of the hollow fiber membrane bundle 32. In embodiments where a flow channel is defined between the circumferential outer surface of the hollow fiber membrane bundle 32 and the inner surface of the outer shell 31, the flow resistance of the coating liquid in the flow channel is relatively small, allowing for a larger flow velocity and flow rate. In some embodiments, the coating apparatus further includes a liquid valve 5, which is disposed on the delivery channel 6 between the degassing unit 2 and the injection pump 7, for opening or closing the delivery channel 6.

[0064] A liquid valve 5 is located on the delivery channel 6 between the degassing unit 2 and the injection pump 7. When the injection pump 7 needs liquid inlet, the liquid valve 5 opens, delivering the coating liquid degassed by the degassing unit 2 to the injection pump 7; when the injection pump 7 does not need liquid inlet, the liquid valve 5 closes, stopping the delivery of the coating liquid between the degassing unit 2 and the injection pump 7. The placement of the liquid valve 5 on the delivery channel 6 between the degassing unit 2 and the injection pump 7 facilitates control over the delivery of the coating liquid between the degassing unit 2 and the injection pump 7.

[0065] In some embodiments, the liquid valve 5 includes a valve seat and a valve core disposed within the valve seat, the opening degree of which is adjustable to regulate the flow rate through the liquid valve 5.

[0066] This setting allows control over the flow rate of the coating solution delivered to the syringe pump 7, and adjustment of the flow rate of the coating solution delivered to the syringe pump 7.

[0067] In some embodiments, referring to FIG2, the coating apparatus includes a buffer container 10, which is disposed on the delivery channel 6 between the liquid valve 5 and the injection pump 7, for storing the coating liquid after degassing by the degassing unit 2.

[0068] The buffer container 10 stores the coating liquid after degassing by the degassing unit 2, supplying the coating liquid to the injection pump 7. The buffer container 10, installed in the delivery channel 6 between the liquid valve 5 and the injection pump 7, protects the coating apparatus. The buffer container 10 reduces flow unevenness and inertial losses, thereby protecting the pump and delivery pipeline and preventing damage caused by rapid pressure changes. The buffer container 10 also improves the stability of the coating apparatus. It helps reduce water hammer effects, prevents excessive flow, ensures hydraulic stability of the system, and prevents the injection pump 7 from frequently starting or stopping due to frequent pressure changes. Furthermore, the buffer container 10 reduces fluctuation amplitude. It effectively reduces hydraulic shock and liquid oscillation in the delivery pipeline, preventing fluctuations in the coating apparatus.

[0069] In some embodiments, the coating apparatus further includes a liquid valve 5, which is disposed on the conveying channel 6 between the degassing unit 2 and the buffer container 10, for opening or closing the conveying channel 6.

[0070] A liquid valve 5 is installed on the conveying channel 6 between the degassing unit 2 and the buffer container 10. When the buffer container 10 needs to be filled with liquid, the liquid valve 5 opens, conveying the coating liquid degassed by the degassing unit 2 to the buffer container 10; when the buffer container 10 does not need to be filled with liquid, the liquid valve 5 closes, and the conveying of the coating liquid between the degassing unit 2 and the buffer container 10 stops. The installation of the liquid valve 5 on the conveying channel 6 between the degassing unit 2 and the buffer container 10 facilitates the control of the conveying of the coating liquid between the degassing unit 2 and the buffer container 10.

[0071] In some embodiments, the coating apparatus includes a liquid pump 9 disposed on a delivery channel 6 between a buffer container 10 and a container 1, for delivering coating liquid from container 1 to the buffer container 10. This configuration provides power for the delivery of coating liquid from container 1 to the buffer container 10 via the action of the liquid pump 9. Furthermore, the liquid pump 9's placement on the delivery channel 6 between the buffer container 10 and the container 1 provides power for the delivery of coating liquid from container 1 to the buffer container 10; this power does not need to be provided by the syringe pump 7, reducing the power performance requirements of the syringe pump 7.

[0072] The liquid pump 9 applies mechanical power to the transport of liquids, enabling the liquids to flow smoothly from low-pressure areas to high-pressure areas.

[0073] The specific location of the liquid pump 9 is not limited. For example, in some embodiments, the liquid pump 9 is located on the delivery channel 6 between the degassing unit 2 and the buffer container 10. With this configuration, the power required for the coating liquid to be delivered 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 power does not need to be provided by the injection pump 7. The injection pump 7 only needs to provide the power for delivering the coating liquid from the buffer container 10 to the injection pump 7, thus reducing the power performance requirements of the injection pump 7.

[0074] In some embodiments, the liquid pump 9 is disposed on the delivery channel 6 between the container 1 and the degassing unit 2. With this arrangement, the coating liquid first flows through the liquid pump 9 and then through the degassing unit 2. In this way, even if air is introduced by the liquid pump 9, it can be degassed by the subsequent degassing unit 2, thereby further reducing the gas content of the coating liquid in the buffer container 10.

[0075] In some embodiments, the coating apparatus 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.

[0076] The liquid level sensor 11 is a sensor for measuring liquid level. The type of liquid level sensor 11 is not limited; for example, it can be a float-type liquid level transmitter, a magnetic liquid level transmitter, an immersion-type liquid level transmitter, an electric internal float liquid level transmitter, an electric float-type 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. It uses an isolated diffused silicon sensing element or a ceramic capacitive pressure sensing 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.

[0077] The liquid level sensor 11 improves 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 a stable output of flow from the delivery channel 6. Furthermore, the liquid level sensor 11 can issue an alarm when the liquid level is too high or too low, ensuring safety during the delivery and handling of the coating liquid, thereby improving the safety of the coating device.

[0078] In the description of this disclosure, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples described in this disclosure, as well as features of different embodiments or examples, without contradiction.

[0079] The above are merely preferred embodiments of this disclosure and are not intended to limit the scope of this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A coating apparatus, comprising: A container for storing coating liquid, an injection pump, and a coating blade, wherein the container is connected to the injection pump via a delivery channel, and the injection pump is connected to the coating blade; A degassing unit is installed on the conveying channel.

2. The coating apparatus according to claim 1, wherein, 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 being provided with a liquid inlet, a liquid outlet and an exhaust port; the hollow fiber membrane bundle is disposed inside the shell and is used to degas the coating liquid; the shell and the hollow fiber membrane bundle together define mutually non-communicating flow channels and air channels, the flow channels connecting the liquid inlet and the liquid outlet, the air channels connecting the exhaust port, and the vacuum device connected to the exhaust port.

3. The coating apparatus according to claim 1 or 2, wherein, The internal channels of the hollow fiber membrane bundle form the air passage, 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 channels of the hollow fiber membrane bundle form the flow channel, and the air passage is defined between the circumferential outer surface of the hollow fiber membrane bundle and the inner surface of the outer shell.

4. The coating apparatus according to any one of claims 1 to 3, wherein, The coating apparatus 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.

5. The coating apparatus according to any one of claims 1 to 4, wherein, The coating apparatus includes a buffer container disposed on the delivery channel between the degassing unit and the injection pump, for storing the coating liquid after degassing by the degassing unit.

6. The coating apparatus according to claim 5, wherein, The coating apparatus further includes a liquid valve, which is disposed 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 apparatus according to claim 5 or 6, wherein, The coating apparatus includes a liquid pump, which is disposed on the delivery channel between the buffer container and the container, for pumping the coating liquid in the container to the buffer container.

8. The coating apparatus according to claim 7, wherein, The liquid pump is located on the conveying channel between the container and the degassing unit.

9. The coating apparatus according to claim 7, wherein, The liquid pump is located on the delivery channel between the degassing unit and the buffer container.

10. The coating apparatus according to any one of claims 5-9, wherein, The coating apparatus also includes a liquid level sensor connected to the buffer container for detecting the liquid level in the buffer container.

11. A battery production line, comprising the coating apparatus according to any one of claims 1-10.

12. The battery production line according to claim 11, wherein, The coating blade is used to apply coating liquid to the battery electrode.

13. The battery production line according to claim 11, wherein, The coating blade is used to coat the battery substrate with a precursor liquid.

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