Power battery pack system design and research is introduced

Source: 2020 - 04 - 11 18:56 hits: times electric buses of the power battery system structure and the demand of new energy car belongs to the national medium and long-term development planning of key support and development of the industry. Power battery packaging system is the core of electric vehicles, is the biggest bottleneck of new energy vehicle technology and cost, also the core industrial chain. Its development will directly affect the industrialization of electric vehicles. The requirements of power battery system of electric vehicle (ev) mainly includes security, energy density, consistency, and low cost. Power battery encapsulation system design is the collection of electronic technology, control technology, material science, process control, such as automotive technology is a body comprehensive science and technology. This is a system engineering. In this paper, the design and research of power battery encapsulation system, introduces the structure, function and design of the system, and the results of the research and application. Combined with the pure electric minibus power battery system for interpretation and explanation. Power battery system composition and the requirements of power battery system refers to the battery pack for power circuit and related accessories. Mainly includes the battery module, battery management system ( BMS) , thermal management system, electrical connectors, battery packaging etc. For power battery system, the design of the vehicle, the control strategy, the matching of components, the function of the management system and so on all affect the using status and performance of the battery. Therefore, should be considered when choosing the matching performance and characteristics of the whole system. Security good general requirements, than can be high, higher than power, good temperature adaptability, long service life, installation and maintenance capability, low comprehensive cost. Physical parameters, the parameters of the battery pack system were introduced. The battery pack system composition, size and quality. Electric performance parameters, capacity, energy, and charged state, voltage, power, resistance, energy efficiency, self-discharge, life; Environment parameters, working temperature range, low temperature start, storage temperature range; Security parameters: insulation resistance, protection grade; Consistency: poor poor capacity, internal resistance and voltage difference; Management system parameters: voltage/current/temperature detection precision, management control function. Pure electric passenger demand as a pure electric vehicle battery system model, at the request of the safety, performance and reliability is not lower than conventional cars, car available space is limited, so the power battery system should have small volume and weight, as compared to pure electric vehicle dynamic performance requirements is not high, but has higher specific energy demand and long cycle life and reliability. At present, lithium ion battery than can be up to 200 wh/kg, stable performance, long cycle life, technology is relatively mature and widely used. In lithium ion batteries as the power of pure electric cars.