Analysis on the classification and functions of electric vehicle batteries

Analysis of the classification and functions of electric vehicle batteries First, the classification of electric vehicle batteries, energy crisis and environmental pollution are two major problems faced by countries all over the world. Electric vehicles have become the inevitable trend of future automobile development because of the benefits of energy saving and environmental protection. Electric vehicle batteries are an important source of power for electric vehicles, accounting for 30% to 50% of the cost of electric vehicles. Electric vehicle batteries can be divided into two categories, namely batteries and fuel power batteries. The battery is suitable for pure electric vehicles and can be divided into lead-acid batteries, nickel-based batteries (nickel-hydrogen batteries, nickel-hydrogen batteries, nickel-cadmium batteries, nickel-zinc batteries), sodium-sulfur batteries, sodium chloride nickel batteries, secondary lithium batteries, Air batteries and other types. Fuel power battery is a battery specially used for fuel-powered electric vehicles. It can be divided into basic fuel power cell (AFC), phosphoric acid fuel power cell (PAFC), molten carbonate fuel power cell (MCFC), and solid oxide fuel power. Battery (SOFC), proton exchange membrane fuel power cell (PEMFC), direct methanol fuel power cell (DMFC) and other types. Second, the battery effect of electric vehicles In pure electric vehicles, the electric vehicle battery is the only power source for the vehicle drive system. In hybrid vehicles, at low speeds and when starting, the battery is an important power source for the vehicle drive system; when the vehicle is fully loaded and accelerating, the battery is the auxiliary power source for the vehicle drive system; when the vehicle is running or decelerating, the battery has energy storage when braking the use of. 3. Electric vehicle battery processing system Electric vehicle battery is a technical bottleneck restricting the planning and development of electric vehicles, and it is also a key factor in the high price of electric vehicles. The battery processing system (BMS) of electric vehicles largely determines the cost, energy saving and safety of electric vehicles. BMS monitors the battery voltage, the charging and discharging current and temperature of the battery pack, and can estimate the remaining power of the battery (SOC) ratio. The battery charge and discharge balance is controlled. The heat treatment is carried out on the battery and vehicle monitoring system. The charger can communicate, control and optimize Charging is completed harmoniously, so that the best operating conditions of the battery, give full play to the function of the battery to extend the battery height. The important functions of BMS include: voltage, current, temperature detection; SOC estimation; charge and discharge control; balance control; heat treatment; safety processing and CAN communication. Accurate measurement of voltage and current of battery and single cell is the condition of SOC estimation, charge and discharge control, balance control and safety processing. The charging voltage and current of different batteries are different, and the electromagnetic group or single battery with the same distance from the charging current is very large at different stages. This requires checking the voltage and current sensors and the surface to comply with the necessary accuracy in a wide dynamic range. This is a difficult BMS power check. SP series variable frequency power sensors have high-precision detection capabilities in a large dynamic range, and are especially suitable for voltage and current detection in battery processing systems and electric vehicle charging detection systems. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.