Application of power film capacitors and ultracapacitor in new energy vehicles (I)

This paper discusses some applications of power film capacitors in new energy vehicles.

Most of the above are semiconductor devices, which are very important. In all devices, in fact, the other part of the passive device is also very important, its product selection, its characteristics, in fact, for your equipment is also very important. I'll take a few minutes to introduce our company. In fact, Ray Electronics's parent company is Fujian Torch Electronics. What you see on the exhibition board is our company. This company has a history of 25 years, from its founding to nearly 25 years. Raytheon also has been in trade for nearly a decade, and long-term cooperation with us is a number of international brands. This is the development process of Raytheon Company. It was established in 1999. We have more than 1000 long-term cooperative customers in the whole China region. This is well-known in the industry, and can be called a benchmark customer. In the process, including North and South Cars, are our long-term cooperation customers. . It took me a while to introduce the company.

Let me share with you some of the basic technology of electric thin film capacitor and its application in new energy vehicles. In fact, what we see on the existing new energy vehicles, most of the control boxes are made of thin film capacitors. For thin film capacitors, there are two most common materials, one is polypropylene, the other is PET. Polypropylene materials are widely used in high-power electronics. Firstly, the loss value is very low; secondly, the insulation voltage per unit thickness is relatively high, which makes a good pre-technical reserve for product volume miniaturization; thirdly, the self-healing performance of this material is very good, and its self-healing characteristics are very good. Therefore, on the high-power lithium electron, the polypropylene film used for film capacitors is very much used. Of course, there are many types of this raw material, but this type, that is, it will be used in different products, I will not describe one by one here. Measuring the voltage of a product, we know that determining a capacitor may mean how high a capacity or voltage is required. How do we assess how high a voltage I need, and how do I achieve the voltage that a customer needs for this product? For a unit of polypropylene membrane material, its current maximum voltage is about 600V per micron, and the insulation voltage it can withstand is 600V. In fact, we don't use its limit value when designing the electric resistance film capacitor. We will use it between 200V and 240V, depending on the customer's product life. There will be a range of requirements or requirements for temperature. In this way to increase the thickness of the film and so on to meet the demand of high voltage products, this is an aspect. Secondly, if the voltage is too high, I may have some series structures in the capacitor to increase the voltage.

For high-power power electronic membrane capacitors, it uses polypropylene as the material. It is also mentioned that it has a very good characteristic of self-healing property, which is a characteristic of this material itself. When this product is made, we spray a layer of metal aluminum on this metallized membrane called a circular membrane. It's a way of vacuum construction, maybe not very perfect, it will have some defects, the product after a relatively large current or voltage over, its heat will be active on the defective film, it will let the aluminum of this layer of metal volatilization, volatilization process will absorb a lot of heat, protect. It proves the safety of the whole capacitor product, which is called self-healing on the membrane capacitor of power electronics. A very good way to volatilize this is to form an insulated zone around the self healing point, which is to say to isolate it, so we can see the insulated zone and the protected area under the microscope. This is a very important characteristic for high-power power electronics membrane capacitor, that is, based on this characteristic, in the future the use of membrane capacitor and the market is becoming more and more extensive, many of which are based on this self-healing performance and it makes the safety and reliability of products to achieve very high.