Abstract: This article takes BYD Co., Ltd. as an example to introduce the successful application case of Yudian AI secondary instrument in the equipment transformation of lithium battery coating production line. The article describes in detail the specific configuration of the instrument configuration and instrument on site. Through practical application, it proves that Yudian's AI secondary instrument has the advantages of precise control, high stability and high reliability in the lithium battery coating production line, and the field runs well.
Keywords: lithium battery, coating production line, AI secondary instrument
Project Overview
BYD Co., Ltd. was founded in 1995 and is headquartered in Shenzhen. It has branches in Shanghai, Beijing, Xi'an, Qingdao and Tianjin. Products are mainly concentrated in the two fastest growing industries - IT industry and automotive industry, including nickel-cadmium batteries, nickel-metal hydride batteries, lithium batteries, plastics, LCD / LCM, automobiles and so on. Shenzhen BYD Lithium Battery Co., Ltd. is a wholly-owned subsidiary of BYD Co., Ltd., and its main products are lithium-ion batteries. The company's customers include Motorola, Nokia, Ericsson, Kyocera, Philips and other international communications giants.
The coating machine control system is a relatively complicated control system on the lithium battery coating production line. In order to ensure the quality of the coating, it is necessary to ensure the smooth running of the film as much as possible, and to minimize the positional deviation of the film during the desired process. This requires the effective operation of the tension control, the correction control and the speed synchronization control during the operation of the slice. In order to ensure the excellent drying quality of the coating layer, it is necessary to accurately control the temperature of each point in the drying tunnel. This time, Shenzhen BYD Lithium Battery Co., Ltd. used Xiamen Yudian Automation Technology Co., Ltd. in the equipment transformation of the lithium battery production line. The company's AI-508EL1L2 and AI-708AL1L2 two AI intelligent secondary instruments have improved the automation level in the coating production line of lithium batteries. The high stability, high reliability and high precision performance of the smart meters are very large. To the extent that the quality of lithium battery coating is guaranteed.
Introduction to instrument configuration
The main technical features of the instrument are as follows:
AI-508 is an economical thermostat widely used in various industrial automation control fields, such as plastic machines, industrial ovens, mold temperature machines, coating machines, hot melt adhesive grades and other fields. The meter itself is 0.3 level measurement accuracy, thermocouple, RTD input, 1 °C display resolution, the instrument can output relay, solid state relay two control modes, plus the anti-interference function of the U-power meter itself, enough to overcome different sites Environmental impact. The instrument has a programmable alarm function, which can set up alarms of up to 4 points, which greatly meets the needs of customers. The AI-708 is a high-precision artificial intelligence regulator that is favored by on-site customers with high demand. The instrument is 0.2-level measurement accuracy, universal input, with various functions such as alarm, transmission, communication, etc. 4-digit digital tube with decimal point display. There are various output methods, such as relay, solid state relay, analog quantity, and thyristor output of four kinds of control modes. In addition, with the design idea of ​​Yudian modular, customers can change the control mode by replacing the module by themselves. The instrument also has RS485 communication function, and multiple instruments can be connected with the host computer or computer to form a small centralized control system.
Customer application function description:
(1) Process description
Yudian meters are mainly used in the drying process of lithium batteries, and the drying temperature of each point is controlled, and its importance is obvious. If each piece of lithium battery is not uniformly dried, the water content ratio is kept consistent, which is likely to cause quality problems of the lithium battery, thereby affecting its service life. If the temperature is too high, the pole piece will become brittle, causing the pole piece to drop powder or the battery to be short-circuited, resulting in a large self-discharge of the battery or even a safety problem. If the temperature is too low, the pole piece will remove water, resulting in low battery capacity and internal resistance. A series of problems such as stability, cycle difference and size anomalies. During the production process, each channel has a temperature of 180 ° C and is provided with an alarm light. Once the temperature exceeds the set temperature of 190 ° C, the product is immediately disposed of.
(2) Description of the use of Yudian Instrument
By controlling the heat generated by the coil, the U-electric meter conducts heat energy to the surface of the drum, and then transfers the heat energy to the dry object to evaporate and evaporate the liquid for drying. Because during the coating process, the first step, when the wet coating liquid content is the highest (above the critical moisture content), the surface air flow rate and the dry air temperature can be applied for rapid drying. The instrument used in this process is the AI-708AL1L2, which has an alarm to prevent overheating and burn out the internal battery material. The temperature was set to 180 ° C and the over temperature alarm point was set to 190 ° C. The assembly line has a total of 20 coating ports, so 20 control cabinets are installed on the control cabinet, and 5 are reserved.
The application of the second step is relatively simple. When the first step of the battery coating is completed and the aluminum foil layer is applied, the semi-finished battery is placed in an industrial oven, the temperature is set to 150 ° C, and the battery is completed by holding for half an hour. During the baking process, it is possible to judge whether the battery is good by the protrusion, crack or overflow of the surface aluminum foil. The instrument used in this process is AI-518EL1L2, the temperature is set to 150 °C, and the over-temperature alarm point is set to 160 °C. There are more than 20 ovens, so it is controlled by 20 thermostats.
Summary of use effect
Temperature control is indispensable throughout the coating process. In practice, Yudian thermostat provides a strong guarantee for the production quality of lithium batteries. The instrument has the advantages of high precision control, high stability and high reliability. In the production process of Shenzhen BYD Lithium Battery Co., Ltd., the instrument field runs well, the temperature control is accurate, and the customer's output rate due to inaccurate temperature control is reduced, which helps the customer to save production cost to a large extent. Helping customers shape a good brand image, the outstanding performance of Yudian thermostat has been recognized by customers.
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