Traditional non-renewable resource constraints and pressures for energy conservation and emission reduction have driven the advent of new energy vehicles. The development of new energy vehicles has risen to a strategic position among countries. The three core technologies of new energy vehicles are motors, electronic control systems and batteries, among which power The battery is the core of the recent development of new energy vehicles.
Compared to lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride battery secondary batteries, lithium batteries have the advantages of high energy density, low self-discharge rate, long cycle life, etc. These advantages of lithium batteries will make it a new energy vehicle battery recent development. The main direction. Lithium battery industry chain consists of lithium ore resources, lithium battery raw materials (including cathode materials, anode materials, separators, electrolytes) and battery manufacturing and packaging of three parts. Among them, the cathode material accounts for the most cost of the lithium battery and accounts for about 30-40% of the manufacturing cost. From the analysis of technical content, the technical barriers for separators and electrolytes are the highest, followed by cathode materials, and the anode materials have the lowest technological content. From the current gross profit margin analysis of lithium battery materials enterprises, the gross profit rate of diaphragm and lithium hexafluorophosphate electrolyte materials is as high as 70%, the electrolyte gross profit rate is about 40%, and the cathode material gross profit rate and negative electrode material gross profit rate are also 20%. Lithium battery materials industry depends on the level of technical content, different types of companies benefit from the degree of difference, the main business of the diaphragm, electrolyte, cathode material benefit a greater degree.
At present, the product design process of domestic automotive lithium batteries is gradually rational, the industrial chain is gradually clear, and lithium battery materials companies are gradually making profits. With the support of national policies, the demand for lithium batteries will gradually increase. There are more investment opportunities in this category of enterprises.
Led street light, compared with the traditional lighting technology, led lamps and lanterns have higher efficiency, and longer service life.Thus become the preferred bulb type, in order to reduce the energy consumption of indoor/outdoor lighting, get energy saving effect.
For street lamps, higher efficiency and longer life are indispensable for cost reduction.Designed for the LED power supply switch power supply, also must have a high efficiency and durability, to ensure that it has as long as the LED life without maintenance.Here, the resonant converter is one of the most popular power supply topology, this is because compared with previous power supply topology, their performance has brought higher power efficiency, and can reduce EMI.Soft switch is an important characteristic of resonant converter.But the resonant converter used in parasitic diodes (bodydiode) can sometimes lead to system failure.Stored in the parasitic diodes charge must be clear, to avoid large current and voltage surge, including topology structure of high dv/dt and di/dt.
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