Why BMS management system for Power Lithium ion Battery?
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2022/04/21 16:04:27
Before important is divided into three categories: developing new energy vehicles, hybrid electric vehicle (HEV) HybridElectricVehicle, fuel power battery cars (FuelCellElectricVehicle, FCEV) and pure electric vehicles (ElectricVehicle, EV). These three types of electric vehicles with their own different structure and working principle, forming their own different characteristics, but also in different stages of development. Pure electric vehicles in vehicle power battery pack (such as lithium ion batteries, lead-acid battery, nickel metal hydride batteries and nickel-cadmium batteries, etc.) as its only source of energy, and carry high power motor to drive the car, therefore, with the traditional internal combustion engine car the biggest difference is unique to pure electric vehicles electric drive and control system. Compared with hybrid electric vehicles, pure electric vehicles have low noise, no pollution, zero emissions, and simpler chassis structure; Compared with fuel-powered battery vehicles, all aspects of technology is relatively more mature, with higher reliability and safety. Therefore, pure electric vehicles have been attached great importance to by governments and automobile companies around the world. Many companies have realized batch processing and started demonstration operation in some regions.
In pure electric vehicles, as one of the core components, the power lithium battery pack occupies a very high proportion in the vehicle manufacturing cost, and its performance directly affects the vehicle's drivability and safety. Most of the lithium batteries used by early pure electric vehicles are lead-acid batteries, which are gradually replaced by lithium ion batteries and other products with outstanding advantages due to their low energy density, short range and short service life. With its advantages of high charging and discharging efficiency, high energy density and strong endurance, lithium-ion batteries have attracted the attention and use of many electric vehicle manufacturers at home and abroad.
Despite the lithium ion battery has more advantage than other types of batteries, but also will be affected by battery core materials and the manufacture craft factors such as limit, lead to single section often exists between lithium ion battery internal resistance, capacity, voltage and other differences, so in actual use, the battery pack inside each monomer battery is easy to appear the phenomenon such as uneven heat or excessive charge and discharge. Over time, these batteries in poor working condition are likely to be damaged in advance, and the overall life of the battery pack is greatly shortened. Moreover, the battery in the state of serious overcharge also has the risk of explosion, resulting in damage to the battery pack and a threat to the user's life safety. Must, therefore, for power lithium battery pack on the electric car is equipped with a set of targeted battery management system (batteryManagementSystem, bMS), and battery pack for effective monitoring, protection, energy balance and fault alarm, and then improve the work efficiency of the whole power lithium battery pack and service life.
Battery management system as a pure electric vehicle power lithium battery pack monitoring management center, have to temperature and voltage of battery pack, charge and discharge current and the correlative parameters of the real-time dynamic monitoring, when necessary, can take the initiative to take emergency measures to protect the monomer battery, the battery pack of alert in charge, discharge, high temperature and short circuit, etc. In addition, the system also have to be used in battery pack the whole cycle to accurately estimate the SOC of the battery, and the remaining power in appropriate way travel distance, and fault anomalies such as key information timely feedback to the driver, at the same time in a suitable way to complete the system with the vehicle ECU or data exchange between upper machine.
This article is posted on Battery Community by Lankway Electronics Technology
Address: https://dianchishequ.com/20224535
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