Requirements for Charging Technology for Electric Vehicles

Release time：2011-06-22

     With the gradual promotion and industrialization of electric vehicles and the growing development of electric vehicle technology, electric vehicles on the charging station technical requirements reflect a consistent trend, requiring the charging station as far as possible to the following objectives:

1, charging fast

        Compared with the development prospects of nickel-hydrogen and lithium-ion battery, the traditional lead-acid battery with its technology is mature, low cost, battery capacity, follow the load output characteristics and no memory effect, but also the existence of Low energy, a short drive mileage problem. Therefore, in the current power battery can not directly provide more driving range of the case, if you can achieve rapid battery charging, in a sense to solve the electric vehicle driving range short this fatal weakness.

2, charging universal

        In a variety of types of batteries, a variety of voltage levels coexistence in the market context, for public places charging device must have to adapt to a variety of types of battery systems and adapt to a variety of voltage levels, that is, the charging system needs to have a wide range of charging, with A variety of types of battery charging control algorithm, with all kinds of electric vehicles on different battery systems to achieve charging characteristics of matching, can be charged for different batteries. Therefore, in the early commercialization of electric vehicles, it should develop relevant policy measures to regulate the public places with the charging device and electric vehicle charging interface, charging specifications and interface protocols.

3, charging intelligent

        One of the most critical issues restricting the development and popularization of electric vehicles is the performance and application level of energy storage batteries. Optimize the battery Intelligent charging method is to achieve the goal of non-destructive battery charging, monitoring the battery discharge status, to avoid over-discharge phenomenon, so as to extend the battery life and energy saving purposes. Charging intelligent application technology development is mainly reflected in the following areas:

● optimized, smart charging technology and charger, charging station;

● battery power calculation, guidance and intelligent management;

● battery failure automatic diagnosis and maintenance technology.

4, power conversion efficiency

        Electric vehicle energy consumption indicators and its operating energy costs are closely related. Reduce the operation of electric vehicles, improve their economy, is to promote the industrialization of electric vehicles, one of the key factors. For the charging station, it is preferable to select a charging device having many advantages such as high power conversion efficiency and low construction cost from the viewpoint of power conversion efficiency and construction cost.

5, charging integration

        In the sub-system miniaturization and multi-functional requirements, as well as the improvement of battery reliability and stability requirements, the charging system will be integrated with the electric vehicle energy management system as a whole, integrated transmission transistor, current detection and reverse discharge protection Function, no external components can be achieved smaller, integrated higher charging solution, so as to save the rest of the electric vehicle layout space, greatly reducing system costs, and optimize the charging effect, to extend battery life.