With the use of lithium batteries as power sources in mobile phones, digital products, laptops, electric toys, military industry, new energy vehicles, portable medical equipment and other fields, the domestic lithium battery industry has developed rapidly. As an important part of lithium battery manufacturing equipment, the market size growth rate of lamination winding machine is greater than the growth rate of shipments, and it has begun to develop in the direction of automation and integration. At present, China's lithium battery equipment manufacturers are mainly concentrated in Dongguan, Guangzhou, and Shenzhen.
On November 28, 2017, the "2017 Fuji Electric Transmission System Products - Lithium Battery Lamination Winding Machine Industry Technical Exchange Conference in South China" co-sponsored by Fuji Electric (China) Co., Ltd. Shenzhen Branch, China Transmission Network, Servo and Motion Control, and China Motion Control Industry Alliance landed in Shenzhen, and invited Fuji Electric Japanese senior technical experts, leaders of the new energy automobile industry, and technical personnel of lithium battery manufacturing enterprises to discuss the market status of China's lithium battery equipment industry. The intelligent direction of manufacturing equipment, the development trend of transmission operation and control technology, and the intelligent application solutions of lamination and winding equipment were shared and exchanged.
"In 2016, the scale of China's lithium battery cell equipment was 7.5 billion yuan, a year-on-year increase of more than 100%, and its Chinese-made equipment accounted for 5.5 billion yuan." Ms. Zhang Wenhua expressed her views on the current situation and future of the lithium battery industry and the lithium battery equipment industry. At present, the production capacity and performance of power batteries are far from meeting the new needs of the terminal electric vehicles and energy storage market, and under the guidance of favorable factors such as the introduction of industry standards and specifications, the growth of new energy vehicles, the large-scale development of the commercialization of the energy storage industry, and the expansion of market share of Chinese enterprises, the next 3-5 years will be a period of rapid growth of lithium battery equipment.
"China is a big automobile country, but not an automobile power, this is mainly because China needs to strengthen in key technologies, and new energy vehicles and intelligent networked vehicles are expected to become a breakthrough to seize the opportunity and catch up with the development." In the theme report of "the development of the new energy vehicle industry and the opportunities and requirements of power batteries", Secretary-General Zhou Fatao said that in 2016, China's new energy vehicle output was 517,000, ranking first in the world, and China's power battery industry has contributed to the rapid development of the world's largest electric vehicle producer. The rapid development of the new energy vehicle industry provides broader market opportunities for new energy vehicle power batteries, but also puts forward higher requirements: the "Action Plan for Promoting the Development of the Automotive Power Battery Industry" released in March this year proposes that the development of the automotive power battery industry needs to adhere to the basic principles of innovation-driven, industrial coordination, green development, and open cooperation.
Mr. Daigo Miyake introduced the application case solutions of Fujifilm SX bus system products in the lithium-ion battery-winding machine industry in the winding machine industry of round objects and irregularly shaped objects. "When winding round objects, it is important to increase the speed of the winding line while maintaining a stable tension. To ensure the stability of the tension, it is necessary to be able to accurately calculate the real-time winding diameter of the winding shaft and give the correct winding shaft speed. In response, the Fujifilm SX bus system calculates the current reel diameter in real time from the encoder feedback of the M4 winding shaft and the encoder feedback of the M2 traction shaft, Miyake said. However, when winding irregularly shaped objects, such as rectangular objects, the winding speed cannot be increased, mainly because the winding shape is not circular. In order to achieve stable winding, it is necessary to control the in-line speed stability and tension stability.
Du Xingxing shared his experience in the lithium battery winding equipment industry for many years. "At present, the winding machine is divided into all-tab winding machine and multi-tab winding machine, and the core principle of the two is basically the same, that is, the constant speed of the feeding material is realized through the variable speed of the needle winding, and the constant tension control of the pole piece is realized based on the premise of this technology. The difference between the two is that the multi-tab winder has alignment requirements for the tab part after the winding is completed, while the all-earphone winder does not have the tab forming part. Du Xingxing said that the winding machine has been developed in China for about 10 years, and has been greatly improved through the intervention of motion control technology in the past two or three years. For example, the shape of the needle is designed through mathematical modeling, and then the trajectory of the needle is calculated by the program to achieve a variable speed curve. In this way, the details of the curve can be clearly reflected, and it will be easier to optimize the directional curve in the future and realize the high-speed and variable speed winding of the flat needle.
In the theme report of "Fujifilm PLC+SAVO+HMI SX System Product Description and Application Cases in Various Industries", Mr. Hisayuki Yoshizaki explained the characteristics, application scope, performance and practical application of Fujifilm SPH System, SPF System and SPM System three major Motion (motion) control system products.
At the scene, Fujifilm brought a general-purpose series corresponding to the EtherCAT version in 2018 - ALPHA7 servo. The servo uses Fuji Electric's unique control algorithm to achieve the industry's highest level of 3.2kHz frequency, shorten the control cycle, and achieve high-speed control, and the instantaneous maximum torque can reach more than 350%, and can also respond to high-speed commands. The encoder resolution is 24-bit high-precision, and the control accuracy is greatly improved to achieve high-precision control. The STO function defined in the international standard IEC61800-5-2 is equipped with the WSU-ST1 plug-in, and functions such as SS1, SLS, SBC, and SSM can be used with the WSU-ST1 plug-in. The ALPHA7 servo is expected to go on sale next year.
Regarding the optimization solution of Fujifilm SMART servo products in the lithium battery industry, Zhou Jinzhang introduced that the interrupt positioning function refers to the direct connection of the sensor signal to the servo amplifier, and after the sensor ON, the servo goes to a fixed length, which has the advantages of high-speed response, high precision and interrupt saving module. Lithium battery tablet maker is used to produce positive electrode piece or negative electrode piece equipment, at present, the efficiency bottleneck of the tablet maker mainly exists in automatic welding tabs, automatic gluing (tab glue), cutting function, etc., Fujifilm Smart solution adopts PLC built-in positioning + servo interrupt positioning control technology, so that the interrupt positioning response time is 0.05ms, no need to slow down the operation, no longer need to decelerate the sensor, so as to assist users to reduce input costs, improve manufacturing process and efficiency.
At present, China's lithium battery equipment manufacturing industry is in a period of rapid growth, and there are many domestic enterprises engaged in related equipment manufacturing, but the scale is small. As far as the future development of the industry is concerned, the automation level of lithium battery equipment needs to be gradually improved, and the equipment process needs to continuously meet the changes in the new process, new technology and new development of lithium batteries, and the power battery will occupy a large market share in the development of the lithium battery industry in the future. This time, Chinese and Japanese experts decoded the key technologies of the lithium battery lamination winder industry, and saw the future of China's lithium battery manufacturing equipment industry.
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