Lithium battery winding constant line speed process introduction and control solution

In the future, China will invest 100 billion yuan to support the development of the new energy automobile industry, and new energy vehicles will further promote the progress of the battery winding industry. This article will introduce what is the battery winding constant line speed process, the main technical difficulties, system performance Requirements and solutions.

I. Introduction

do you know? The mobile phone battery, laptop battery, camera battery, DV battery, and electric vehicle battery we use are all manufactured by a Lithium Battery winder. The types of lithium battery winders mainly include square type semi-automatic winding machine, square type automatic winding machine and round type automatic winding machine. Here, the square type automatic winding machine is mainly introduced.

Second, the battery winding industry prospects

New energy vehicles led by electric vehicles have become the key support targets during the 12th Five-Year Plan period. In 2010, the central government and local governments have clearly put forward the dual stimulus measures of “heavy subsidies + government support”. According to the preliminary plan, China will invest 100 billion yuan in the future to support the development of the new energy automobile industry. At the same time, many ministries are taking the lead in formulating relevant policies related to supporting the development of new energy vehicles. The "Twelfth Five-Year Plan for the Development of Electric Vehicle Technology" led by the Ministry of Science and Technology has been finalized and will be officially announced at the latest next year. According to the "Planning", miniaturization and car electrification are the two major directions for the future development of China's automobiles. In 2015, China's electric vehicle ownership plan reached 1 million units, and the power battery capacity reached about 10 billion watt-hours. To this end, China plans to promote the development of the electric vehicle industry chain, power battery, motor, and electronic control become the core of future development.

The development of the new energy automobile industry is bound to bring about the rapid development of the battery production and manufacturing industries, which will bring significant development opportunities to the battery production equipment enterprises, and will also put forward higher requirements for the existing battery production equipment. .

Third, the battery winding constant line speed process introduction

The main technical difficulty of the lithium battery winding equipment is how to control the tension and constant line speed winding of the diaphragm and the pole piece. The quality control of the pole piece directly determines the production quality of the battery, and the balance of the tension is good for the battery winding process. Sexuality and productivity also have a direct impact. The tension control is directly controlled by the constant linear velocity of the pole when the battery is wound. If the linear velocity of the pole piece is constant when winding, the tension will be a constant value. If the linear velocity jumps, the tension also A jump will occur.

The constant line speed control of the pole piece is particularly prominent on the square battery. Because of the special shape of the needle, the distance between each point on the periphery of the needle and the center of the needle is different. It is an irregular shape, so To achieve constant line speed, the needle must be rotated at a varying speed to ensure the same line speed at each point on the arc during the week.

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