Novel lithium ion battery diaphragm online continuous coating system and method

Abstract

The invention discloses a novel lithium ion battery diaphragm online continuous coating system and method. The novel lithium ion battery diaphragm online continuous coating system comprises a feeding system, a base membrane system, a coating system, a drying system, a rolling system and a slitting system. The feeding system is used for filtering and storing coating liquid; the base membrane system is used for converting the raw material slurry into a lithium ion battery base layer diaphragm; the coating system is used for uniformly coating a coating liquid on the lithium ion battery base layer diaphragm through a coating head; the drying system is used for completing preparation of a dry mold coating layer; the winding system is used for composite film conveying, automatic deviation correction, tension control and automatic winding; and the slitting system is used for slitting the composite film. The automatic level, the coating quality and the production efficiency of lithium ion battery diaphragm production can be improved, meanwhile, the production cost is reduced, and the market competitiveness of products is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion battery separator production, and in particular to a novel online continuous coating system and method for lithium ion battery separators. Background Art

[0002] With the widespread application of lithium-ion batteries in electronic equipment, electric vehicles and other fields, the requirements for lithium-ion battery performance are constantly increasing. As a key component of the battery, the performance of lithium-ion battery separators directly affects the safety and performance of the battery. In the production process of lithium-ion battery separators, the coating process is an important link to improve the performance of the separator. However, the existing lithium-ion battery separator coating device system has problems such as uneven coating, low efficiency, and difficulty in achieving continuous production. Summary of the invention

[0003] The purpose of the present invention is to provide a novel online continuous coating system and method for lithium-ion battery separators, which is used to solve the problem of poor coating production effect of lithium-ion battery separators in the prior art.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A novel online continuous coating system for lithium-ion battery separators, including a feeding system, a base film system, a coating system, a drying system, a winding system and a slitting system;

[0006] The feeding system is used to filter and store the coating liquid, and transport it to the coating head station included in the coating system;

[0007] The base membrane system is used to convert the raw material slurry into a lithium-ion battery base membrane, and transport the lithium-ion battery base membrane to the coating system;

[0008] The coating system evenly coats the coating liquid on the lithium-ion battery base diaphragm through a coating head, and the coating system includes an angle-adjustable scraper, which is used to adjust the thickness of the coating layer;

[0009] The drying system is used to evaporate and remove the volatile substances of the wet mold coating layer to complete the preparation of the dry mold coating layer;

[0010] The winding system is used for transmitting, automatically correcting, controlling tension and automatically winding the composite film formed by the dry mold coating layer and the lithium-ion battery base separator;

[0011] The slitting system is used for slitting the composite film.

[0012] As a further solution of the present invention: the feeding system includes a storage tank, a delivery pump and a filter. The storage tank is used to store the coating liquid. The stored coating liquid is delivered to the coating head station by the delivery pump. The coating liquid is filtered by the filter and then stored in the storage tank.

[0013] As a further solution of the present invention: the storage tank is provided with a liquid level sensor for real-time monitoring of the storage liquid height. When the real-time monitoring storage liquid height value obtained by the liquid level sensor is lower than a set threshold, the feeding system sends out an alarm to remind the staff to add coating liquid.

[0014] As a further solution of the present invention: the base membrane system is provided with a feeding device, an extrusion device, a casting device, an MDO longitudinal pulling device, a TDO first pulling device, an extraction device and a TDO second pulling device in sequence along the raw material processing direction to complete the processing of the lithium-ion battery base membrane.

[0015] As a further solution of the present invention: the coating system also includes a pressure roller, which is used to coat, transport and compact the wet mold coating layer and the lithium-ion battery base membrane.

[0016] As a further solution of the present invention: the drying system includes a hot air dryer and an infrared dryer, the hot air dryer uses hot air to dry the wet mold coating layer on the lithium-ion battery base membrane; the infrared dryer uses the thermal effect of infrared rays to assist in accelerating the drying of the wet mold coating layer.

[0017] As a further solution of the present invention: the drying system also includes a temperature sensor, a wind speed sensor and a display screen, the temperature sensor is used to monitor the drying temperature in real time, the wind speed sensor is used to monitor the drying wind speed in real time, and the real-time monitoring of the drying temperature and the real-time monitoring of the drying wind speed are both uploaded and fed back to the display screen for display.

[0018] As a further solution of the present invention: the winding system includes a transmission guide roller, a winding roller and a tension control subsystem, the transmission guide roller is used to guide the composite film to be transmitted to the winding roller for winding, and the tension control subsystem is used to ensure the stability of the tension of the composite film during the winding process.

[0019] As a further solution of the present invention: the feeding system, the base film system, the coating system, the drying system, the winding system and the slitting system are integrated and coordinated controlled.

[0020] A novel online continuous coating method for lithium-ion battery separators comprises the following steps:

[0021] S1. Start the base film system, which converts the raw material slurry into a lithium-ion battery base film through the processes of feeding, extrusion, sheet casting, MDO longitudinal drawing, TDO primary drawing, extraction and TDO secondary drawing, and unwinds the lithium-ion battery base film and transports it to the coating system;

[0022] S2, the feeding system transports the filtered and stored coating liquid to the coating system, and the coating system evenly coats the coating liquid on the lithium-ion battery base diaphragm through the coating head, adjusts the angle and pressure of the scraper according to the preset coating thickness, and ensures that the coating layer thickness is uniform through the scraper;

[0023] S3. After coating, the lithium-ion battery base membrane with the wet mold coating layer enters the drying system, and the drying system starts working through the hot air dryer and the infrared dryer to quickly dry and form a composite film of the dry mold coating layer and the lithium-ion battery base membrane, wherein the drying system monitors the drying temperature and wind speed in real time through the temperature sensor and the wind speed sensor respectively, so that the drying system adjusts the drying parameters according to the monitoring data to ensure the drying effect;

[0024] S4, the dried composite film enters the winding system, through which the composite film is transmitted, automatically corrected and automatically wound. During the automatic winding process, the winding system ensures the stability of the tension of the winding process through the tension control subsystem;

[0025] S5. The automatically rolled composite film is slit by the slitting system according to size requirements.

[0026] Beneficial effects of the present invention:

[0027] (1) The present invention can achieve high-precision and high-uniform coating production of lithium-ion battery separators, thereby improving the performance and quality of the separators;

[0028] (2) The coating system uses advanced spraying technology and scraper adjustment mechanism to achieve coating requirements of different thicknesses, improving the versatility and adaptability of the online continuous coating system;

[0029] (3) The drying system uses a combination of hot air drying and infrared drying to quickly dry the coated diaphragm and improve production efficiency;

[0030] (4) The tension control system of the winding system can ensure the stability of the tension of the diaphragm during the winding process, avoid wrinkles and breaks, and improve the product yield;

[0031] (5) The present invention can realize online continuous coating, reduce manual intervention, and improve production efficiency and automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Figure 1 It is a schematic diagram of the production process of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in the description of the present invention, the meaning of "multiple" and "several" is at least two, for example two, three, etc., unless otherwise clearly and specifically defined.

[0036] See also Figure 1 As shown, the present invention is a novel online continuous coating system for lithium-ion battery separators, including a feeding system, a base film system, a coating system, a drying system, a winding system and a slitting system; the feeding system, the base film system, the coating system, the drying system, the winding system and the slitting system are integrated and coordinated with each other; during the entire coating process, each system works together to achieve online continuous coating of lithium-ion battery separators, and the online continuous coating can be monitored and adjusted in real time to ensure coating quality and production efficiency.

[0037] During the design process of the above-mentioned integrated collaborative system, the feeding system is used to filter and store the coating liquid, and transport it to the coating head station included in the coating system; the base film system is used to convert the raw material slurry into a lithium-ion battery base membrane, and transport the lithium-ion battery base membrane to the coating system; the coating system uniformly coats the coating liquid on the lithium-ion battery base membrane through the coating head, and the coating system includes an angle-adjustable scraper, which is used to adjust the thickness of the coating layer; the drying system is used to evaporate and remove the volatile substances of the wet mold coating layer to complete the preparation of the dry mold coating layer; the winding system is used to transport, automatically correct, control the tension and automatically wind up the composite film formed by the dry mold coating layer and the lithium-ion battery base membrane; the slitting system is used to slit the composite film.

[0038] During the use of the online continuous coating system of the present application, by integrating the feeding, base film, coating, drying, winding and slitting systems into a continuous production line, efficient and automated production of lithium-ion battery separators can be achieved, and manual intervention can be reduced in the production process, thereby improving production efficiency and the degree of automation; high-precision and high-uniformity coating of lithium-ion battery separators can be achieved, thereby improving the performance and quality of the produced separators.

[0039] In this specific embodiment, the feeding system includes a storage tank, a delivery pump and a filter. The storage tank is used to store the coating liquid. The stored coating liquid is delivered to the coating head station by the delivery pump. The coating liquid is filtered by the filter and stored in the storage tank, so that the coating liquid from which impurities are filtered out is collected in the storage tank and then quickly delivered to the coating system by the delivery pump. A liquid level sensor for real-time monitoring of the storage liquid height is provided on the storage tank. When the real-time monitoring storage liquid height value obtained by the liquid level sensor is lower than the set threshold, the feeding system sends an alarm to remind the staff to add coating liquid.

[0040] In this specific embodiment, the base membrane system is provided with a feeding device, an extrusion device, a sheet casting device, an MDO longitudinal pulling device, a TDO first pulling device, an extraction device and a TDO second pulling device in sequence along the raw material processing direction to complete the processing of the lithium-ion battery base membrane; the base membrane system is used for the production and processing of lithium-ion battery base membranes, which is the prior art here and will not be elaborated in detail.

[0041] In this specific embodiment, the coating system further comprises a pressure roller, which is used to coat, transport and compact the wet mold coating layer and the lithium-ion battery base membrane.

[0042] In this specific embodiment, the drying system includes a hot air dryer and an infrared dryer. The hot air dryer dries the wet mold coating layer on the lithium-ion battery base membrane through hot air; the infrared dryer uses the thermal effect of infrared rays to assist in accelerating the drying of the wet mold coating layer; the present application adopts a composite drying technology consisting of a hot air dryer and an infrared dryer to improve the drying efficiency and effect.

[0043] In this specific embodiment, the drying system also includes a temperature sensor, a wind speed sensor and a display screen. The temperature sensor is used to monitor the drying temperature in real time, and the wind speed sensor is used to monitor the drying wind speed in real time. The real-time monitoring of the drying temperature and the real-time monitoring of the drying wind speed are both uploaded and fed back to the display screen for display, thereby ensuring the stability and reliability of the drying process.

[0044] In this specific embodiment, the winding system includes a transmission guide roller, a winding roller and a tension control subsystem. The transmission guide roller is used to guide the composite film to be transmitted to the winding roller for winding, and the tension control subsystem is used to ensure the stability of the tension of the composite film during the winding process. During the winding process, the tension control system adopts advanced sensors and control algorithms, which can automatically adjust the tension according to parameters such as the thickness, width and winding speed of the diaphragm, thereby avoiding winding wrinkles and breaks, thereby ensuring the stability of the winding process and the quality of the finished product.

[0045] In this specific embodiment, the feeding system, base film system, coating system, drying system, winding system and slitting system are integrated and coordinated to control each other; a collaborative working mechanism between the systems is realized, and the online continuous coating system of the present application is monitored and adjusted in real time as a whole, ensuring the smoothness and coating quality of the entire coating process.

[0046] Combination Figure 1 As shown, the present invention also provides a novel online continuous coating method for lithium ion battery separators, comprising the following steps:

[0047] S1. Start the base film system. The base film system converts the raw material slurry into the lithium-ion battery base membrane through the processes of feeding, extrusion, casting, MDO longitudinal drawing, TDO first drawing, extraction and TDO second drawing, and unwinds the lithium-ion battery base membrane and transports it to the coating system.

[0048] S2. The feeding system transports the filtered and stored coating liquid to the coating system. The coating system evenly coats the coating liquid on the base membrane of the lithium-ion battery through the coating head, adjusts the angle and pressure of the scraper according to the preset coating thickness, and ensures that the coating layer thickness is uniform through the scraper.

[0049] S3. After coating, the lithium-ion battery base membrane with the wet mold coating layer enters the drying system. The drying system starts working through the hot air dryer and the infrared dryer to quickly dry and form a composite film of the dry mold coating layer and the lithium-ion battery base membrane. The drying system monitors the drying temperature and wind speed in real time through the temperature sensor and the wind speed sensor respectively, so that the drying system adjusts the drying parameters according to the monitoring data to ensure the drying effect.

[0050] S4. The dried composite film enters the winding system, through which the composite film is transmitted, automatically corrected and automatically wound. During the automatic winding process, the winding system ensures the stability of the tension of the winding process through the tension control subsystem.

[0051] S5. The automatically rolled composite film is slit by the slitting system according to size requirements.

[0052] The online continuous coating method of the present application can integrate the feeding, base film, coating, drying, winding and slitting systems into a continuous production line, which can realize the efficient and automated production of lithium-ion battery separators, reduce manual intervention in the production process, thereby improving production efficiency and automation; it can realize high-precision and high-uniformity coating of lithium-ion battery separators, thereby improving the performance and quality of the produced separators.

[0053] It should be understood that the online continuous coating system or method of the present application has the following advantages:

[0054] 1. Integrated online continuous coating system: By integrating the feeding, base film, coating, drying, winding and slitting systems into a continuous production line, efficient and automated production of lithium-ion battery separators is achieved.

[0055] 2. High-precision coating technology: The coating head adopts advanced spraying technology, combined with an adjustable scraper, to achieve high-precision and high-uniform coating of the coating liquid, thus improving product quality.

[0056] 3. Real-time liquid level monitoring and automatic feeding: The storage tank is equipped with a liquid level sensor, which can monitor in real time and automatically remind to add coating liquid, ensuring the continuity of feeding and the stability of production.

[0057] 4. Multi-stage filtration system: The filter design effectively removes impurities in the coating liquid, ensures the purity of the coating liquid, and thus improves the coating quality.

[0058] 5. Composite drying technology: Combining hot air dryer and infrared dryer improves drying efficiency and effect. At the same time, real-time monitoring by temperature sensor and wind speed sensor ensures the stability and reliability of the drying process.

[0059] 6. Intelligent tension control: The tension control subsystem in the winding system can automatically adjust the tension according to the real-time parameters of the diaphragm, ensuring the stability of the winding process and the quality of the finished product.

[0060] 7. Collaborative working mechanism: The collaborative working mechanism between the systems ensures the smoothness and coating quality of the entire coating process through real-time monitoring and adjustment by the control system.

[0061] 8. Automation and intelligent control: The automation and intelligent control of the entire device system reduces manual intervention and improves production efficiency and operational safety.

[0062] 9. Highly adaptable process adjustment: The adjustable angle and pressure of the scraper and the real-time adjustment of drying parameters enable the system to adapt to different coating requirements and product specifications.

[0063] 10. Environmental adaptability and energy efficiency: The design of the drying system takes environmental adaptability and energy efficiency into consideration, and reduces energy consumption by optimizing drying parameters.

[0064] 11. Real-time monitoring and analysis of production data: By real-time monitoring of production data, such as coating liquid flow, drying temperature and wind speed, the production process can be optimized to improve production efficiency and product quality.

[0065] In summary, these inventive advantages together constitute the core innovation of this patent, which aims to improve the automation level, coating quality and production efficiency of lithium-ion battery separator production, while reducing production costs and improving the market competitiveness of products.

[0066] This embodiment provides a practical embodiment based on a novel online continuous coating method for lithium-ion battery separators according to the present invention:

[0067] 1) System installation and configuration: Install and configure the storage tank, delivery pump, filter, various equipment in the base film system, coating head, scraper, pressure roller, hot air dryer, infrared dryer, winding roller and tension control system according to the design drawings and operation manual; during installation, ensure that the interfaces and connections of all components are correct to ensure the sealing and safety of the system.

[0068] 2) Setting of feeding system: Check whether the liquid level sensor of the storage tank is accurate and set the appropriate liquid level alarm threshold; and adjust the flow and pressure of the delivery pump according to the characteristics of the coating liquid and coating requirements.

[0069] 3) Adjustment of the coating system: adjust the position and angle of the coating head to ensure that the coating liquid can be evenly coated on the diaphragm; and adjust the angle and pressure of the scraper according to the required coating thickness to achieve precise coating effect.

[0070] 4) Debugging of drying system: Adjust the working parameters of hot air dryer and infrared dryer, such as temperature, wind speed and irradiation intensity, to meet different drying requirements; calibrate temperature sensor and wind speed sensor to ensure the accuracy of monitoring data.

[0071] 5) Configuration of the winding system: adjust the speed of the winding roller and the parameters of the tension control system to adapt to diaphragms of different thicknesses and widths; ensure that the tension control system can automatically adjust the tension according to real-time data to avoid wrinkles or breaks in the diaphragm during the winding process.

[0072] 6) System startup and operation: Start the online continuous coating system, perform system self-test and preheating. Install the lithium-ion battery separator on the unwinding roller and transport it to the coating system through the conveyor.

[0073] 7) Monitoring of coating process: Monitor the working status of the feeding system to ensure a stable supply of coating liquid; monitor the operation of the coating system to ensure uniform coating of the coating liquid, and adjust the settings of the scraper and pressure roller in real time.

[0074] 8) Control of the drying process: Monitor the working status of the drying system to ensure rapid drying of the diaphragm; adjust the drying parameters in real time based on the monitoring data of the temperature sensor and wind speed sensor.

[0075] 9) Adjustment of the winding process: Monitor the working status of the winding system to ensure stable winding of the diaphragm; automatically adjust the settings of the tension control system according to the real-time parameters of the diaphragm.

[0076] 10) Data recording and analysis: record key data in the production process, such as coating liquid flow, drying temperature and wind speed, winding tension, etc.; analyze data, optimize production parameters, and improve production efficiency and product quality.

[0077] 11) Maintenance and troubleshooting: Regularly maintain the system, including cleaning, lubrication and inspection; establish a troubleshooting process so that problems can be quickly resolved when they arise.

[0078] 12) Operation training and safety education: Provide system operation training to operators to ensure that they are familiar with the system's operating procedures and safety regulations; emphasize the importance of safe operation to ensure the safety of personnel during the production process.

[0079] Through the above-mentioned specific implementation methods, it can be ensured that the online continuous coating device system can operate efficiently and stably to meet the high standards required for the production of lithium-ion battery separators.

[0080] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A novel online continuous coating system for lithium-ion battery separators, characterized in that: Including feeding system, base film system, coating system, drying system, winding system and slitting system; The feeding system is used to filter and store the coating liquid, and transport it to the coating head station included in the coating system; The base membrane system is used to convert the raw material slurry into a lithium-ion battery base membrane, and transport the lithium-ion battery base membrane to the coating system; The coating system evenly coats the coating liquid on the lithium-ion battery base diaphragm through a coating head, and the coating system includes an angle-adjustable scraper, which is used to adjust the thickness of the coating layer; The drying system is used to evaporate and remove the volatile substances of the wet mold coating layer to complete the preparation of the dry mold coating layer; The winding system is used for transmitting, automatically correcting, controlling tension and automatically winding the composite film formed by the dry mold coating layer and the lithium-ion battery base separator; The slitting system is used for slitting the composite film.

2. A novel online continuous coating system for lithium-ion battery separators according to claim 1, characterized in that: The feeding system includes a storage tank, a delivery pump and a filter. The storage tank is used to store the coating liquid. The storage coating liquid is delivered to the coating head station by the delivery pump. The coating liquid is filtered by the filter and then stored in the storage tank.

3. A novel online continuous coating system for lithium-ion battery separators according to claim 2, characterized in that: The storage tank is provided with a liquid level sensor for real-time monitoring of the storage liquid height. When the real-time monitoring storage liquid height value obtained by the liquid level sensor is lower than a set threshold, the feeding system sends out an alarm to remind the staff to add coating liquid.

4. A novel online continuous coating system for lithium-ion battery separators according to claim 1, characterized in that: The base film system is provided with a feeding device, an extrusion device, a sheet casting device, an MDO longitudinal pulling device, a TDO first pulling device, an extraction device and a TDO second pulling device in sequence along the raw material processing direction to complete the processing of the lithium ion battery base diaphragm.

5. A novel online continuous coating system for lithium-ion battery separators according to claim 1, characterized in that: The coating system also includes a pressure roller, which is used to coat, transport and compact the wet mold coating layer and the lithium-ion battery base diaphragm.

6. A novel online continuous coating system for lithium-ion battery separators according to claim 1, characterized in that: The drying system includes a hot air dryer and an infrared dryer. The hot air dryer dries the wet mold coating layer on the lithium ion battery base membrane through hot air; the infrared dryer uses the thermal effect of infrared rays to assist in accelerating the drying of the wet mold coating layer.

7. A novel online continuous coating system for lithium-ion battery separators according to claim 6, characterized in that: The drying system also includes a temperature sensor, a wind speed sensor and a display screen. The temperature sensor is used to monitor the drying temperature in real time, and the wind speed sensor is used to monitor the drying wind speed in real time. The real-time monitoring of the drying temperature and the real-time monitoring of the drying wind speed are both uploaded and fed back to the display screen for display.

8. A novel online continuous coating system for lithium-ion battery separators according to claim 1, characterized in that: The winding system includes a transmission guide roller, a winding roller and a tension control subsystem. The transmission guide roller is used to guide the composite film to be transmitted to the winding roller for winding, and the tension control subsystem is used to ensure the stability of the tension of the composite film during the winding process.

9. A novel online continuous coating system for lithium-ion battery separators according to claim 1, characterized in that: The feeding system, the base film system, the coating system, the drying system, the winding system and the slitting system are integrated and coordinated with each other.

10. A novel online continuous coating method for lithium-ion battery separator, characterized in that: The following steps are involved: S1. Start the base film system, which converts the raw material slurry into a lithium-ion battery base film through the processes of feeding, extrusion, sheet casting, MDO longitudinal drawing, TDO primary drawing, extraction and TDO secondary drawing, and unwinds the lithium-ion battery base film and transports it to the coating system; S2, the feeding system transports the filtered and stored coating liquid to the coating system, and the coating system evenly coats the coating liquid on the lithium-ion battery base diaphragm through the coating head, adjusts the angle and pressure of the scraper according to the preset coating thickness, and ensures that the coating layer thickness is uniform through the scraper; S3. After coating, the lithium-ion battery base membrane with the wet mold coating layer enters the drying system, and the drying system starts working through the hot air dryer and the infrared dryer to quickly dry and form a composite film of the dry mold coating layer and the lithium-ion battery base membrane, wherein the drying system monitors the drying temperature and wind speed in real time through the temperature sensor and the wind speed sensor respectively, so that the drying system adjusts the drying parameters according to the monitoring data to ensure the drying effect; S4, the dried composite film enters the winding system, through which the composite film is transmitted, automatically corrected and automatically wound. During the automatic winding process, the winding system ensures the stability of the tension of the winding process through the tension control subsystem; S5. The automatically rolled composite film is slit by the slitting system according to size requirements.

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