Discussion on MES application in lithium battery i

  • Detail

Talking about MES application in lithium battery industry

economic growth has driven the rapid growth of global consumer electronics. In China, it has almost become people's body organs, and notebook computers are also rapidly popularized. However, consumer electronics recall events occur frequently every year, and the potential safety hazards of products can be the most feared thing for consumer electronics manufacturers. It not only costs a lot of retrospective recall costs, but also causes immeasurable losses to the reputation of manufacturers. At present, the vast majority of consumer electronic product recalls are caused by batteries. For example, there is a linear relationship between the 20 bridging degree and the melt viscosity of colloid. In August 2007, Nokia announced that due to the hidden danger of overheating, the company decided to recall 46million battery (bl-5c battery) made by Panasonic worldwide, with a record number of recalls; For another example, Toshiba said in June 2007 that it would recall 10000 defective Sony notebook batteries sold in Japan and around the world. It is said that the laptop battery made by Sony for Toshiba has caused several laptop fires; In November, 2005, Nikon, a digital camera manufacturer, urgently recalled the EN-EL3 lithium-ion battery because four customers encountered battery explosion, overheating and melting problems

then, how to prevent the recall caused by battery quality and how to reduce the cost of recall. MES is undoubtedly the best choice. Here we focus on the MES application of light lithium battery, hoping to attract jade for the MES application in the battery industry

some people say that lithium battery itself is unsafe. They say that because lithium is a very active chemical element, it is easy to catch fire and explode when damaged by external forces. For example, when the notebook is put on the bed, the ventilation is not good, and the temperature is getting higher and higher, causing a chain reaction. However, due to the instability of lithium battery in principle, the requirements for production process are more stringent! Today, with frequent accidents, a little improper control of manufacturers' technology in the manufacturing process will lead to safety problems. It is understood that Sony's lithium battery, which caused the fire and explosion, was caused by small metal particles mixed into the battery cell during the manufacturing process; Panasonic's recalled notebook battery (not made by Sony) is also due to manufacturing defects, resulting in liquid leakage, heating, deformation, and even the risk of fire

the production of lithium can be roughly divided into two stages, process stage and discrete stage. The process section is mainly the production, smearing and cutting of positive and negative materials. The process equipment in this section has a relatively high degree of automation and less manual participation. And the form of products is calculated in batches, so the control of MES in this section is in a large number of control methods. For example, when the cathode material is vacuum stirred, MES records the bucket number of the mixing barrel, the batch number of the materials added during mixing, and the relevant parameters of the equipment during mixing. The viscosity data also enters the MES system immediately after the test. The production manager can easily know the mixing state of the materials in each barrel through MES, After production, you can also immediately query the batch number of this batch of materials when mixing and the control parameter value of the equipment when mixing. The cutting of the process section has relatively little impact on the quality of products. Although the production mode of cutting is machine cluster production, the control and operation of the cutting machine are relatively simple, so the MES system can not be used for cutting. Next is the lamination/winding section, which is also the focus of MES in the production process of lithium batteries. General lithium battery factories spray codes only after re inspection before the MES system is applied. At this time, the barcode can no longer be associated with the management of the production process, and the content of the barcode can only represent the production batch number and model. After the application of MES system, the printing process will be preceded to lamination. Because the quality of the battery is closely related to the temperature and pressure during the heat sealing of the heat sealing machine, it is also one of the main tasks of MES to conduct experiments in this environment to record the temperature and pressure during the heat sealing of the battery. In addition, the quality data of short circuit detection in this process is also a key recording object in the MES system. After these data enter the MES system in real time, managers can immediately know the parameter status, production output and quality status of each heat sealing machine through MES, so as to provide a basis for production and quality decision-making in a timely manner. After lamination/winding, it is liquid injection and pre filling. The data acquisition of liquid injection process is mainly the heat sealing data acquisition after liquid injection, and the pre filling is mainly to collect the relevant data of bad cells during volume division, such as bar code, voltage, etc. The second seal refill mainly collects the dispatch data and the short-circuit data of the inspection electrode packaging film. Recharging mainly collects volume classification data, and there are many data on the utilization of LANXESS plastics in hybrid electric vehicles and electric vehicles. Finally, the re inspection and shipment. The battery is generally sampled at the AQL level during the re inspection. After the MES system is connected with the detection equipment, the system will automatically receive or batch return the detected data after entering the MES system according to the set AQL inspection method. The authority of the inspection data also said that Suning was suspected of using false information to hype the stock market and associate it with barcode. The packaging after re inspection is also a key point of MES' application in the battery industry. Because customers often receive complaints about which box/box contains less than one cell, a real-time packaging is required to be clear, and the number of the packaging box and all the barcodes in the packaging box should be recorded in detail, so as to know it well. Of course, the application of MES in lithium battery is not only to control and record the data of key processes, but also, like all MES systems, MES in lithium battery industry includes equipment management system, quality management system, etc. This requires lithium battery manufacturers to choose according to their own needs. In general, the main functions of MES in the application of lithium batteries are:

1. Real time quality monitoring, changing the quality of post remedy to pre prevention

2. Monitor the process key parameters to ensure the process safety of lithium batteries as much as possible

3. Make detailed records of packaging and be fully prepared to receive customer complaints

4. Real time query of output and quality to reduce the delivery pressure of the planning department

5. Realize the traceability of the production process, and quickly and accurately determine the recall scope

6. Paperless production management, saving labor costs

the safety of batteries has attracted more and more attention. We earnestly hope that MES can make contributions to the safety of batteries. (end)

Copyright © 2011 JIN SHI