Selection of Traction Battery of Electric Battery Dual Energy Engineering Vehicle

The electric energy storage battery dual energy engineering vehicle is suitable for the third rail powered subway line and adopts a dual power supply system. When the third rail system is without electricity, the battery can be used for power traction. Traction battery performance is critical to this locomotive. Here we analyze the determination of the type, maintainability, capacity, charge and discharge performance of the traction battery of an electric battery dual-energy engineering vehicle . The selection of the battery is a complex issue and the traction performance of the locomotive needs to be systematically calculated. Based on the input and output characteristics of the Singapore Electric Battery Dual Energy Engineering Vehicle, this article discusses the use environment, type, maintainability, charge and discharge performance, volume, and weight of the battery, and explains the selection conditions and methods of the traction battery.

The equivalent circuit and related parameters for the traction battery are required. The power battery dual energy engineering vehicle adopts dual power supply system, namely DC750V third rail power supply and traction battery power supply. When the third rail has electricity, the locomotive will introduce DC750V power into the locomotive through the current receiver, and supply the three-phase AC traction motor through the inverter. At the same time, the traction battery is charged through the on-board charger; when the third rail is without electricity, the traction battery is The inverter supplies power to the three-phase AC traction motor. When the circuit breaker K1 is closed and K2 is opened, the third rail supplies power to the load while charging the battery pack via the chopper. When circuit breaker K2 is closed and K1 is open, the traction battery pack supplies power to the load. The 3AC400V input of the charger is an on-board diesel generator or three-phase power supply in the warehouse. The rated voltage of DC third rail is DC750V, the highest voltage is DC900V, and the lowest voltage is DC525V.

When the traction battery supplies power, the maximum weekly power of the locomotive is 300 kW, and the power consumption of the locomotive auxiliary system is approximately 11.4 kW (average). Requirements for traction batteries; requirements for traction batteries for electric battery dual-energy engineering vehicles include capacity requirements, charge and discharge performance requirements, maintainability, volume, and weight. In terms of capacity, the locomotive requires a 100-ton load and an inoperative locomotive to run a 27-km line when the battery is powered. The maximum speed is 18 km/h. In charging and discharging, it is required that 8 hours of charging can reach 80% of the battery capacity, and the discharge working time is about 5 hours. The size of the discharge current needs to be calculated based on the specific wheel cycle power when the locomotive is running. The battery type is determined; the environmental conditions have great influence on different types of batteries. Especially lead-acid batteries, when the temperature is higher than 25 °C, every 10 °C increase, the battery life is reduced to about half of the nominal; when the temperature is lower than 25 °C, the battery capacity will gradually decline, at around 0 °C The capacity is only about 80% of the nominal capacity. Alkaline batteries have better low-temperature performance, and lead-acid batteries and alkaline batteries can meet application requirements. Taking into account the cost factor, the locomotive uses a lead-acid battery.

Lead-acid battery maintainability Lead-acid batteries are divided into two types: liquid-rich and valve-regulated. Valve-controlled sealed batteries are lean-type batteries. The advantage of a flooded battery is its long service life and good battery consistency. The disadvantage is that during operation, it is necessary to add acid and water regularly, adjust the electrolyte density, and there is an overflow of acid mist and corrosion to the equipment. In order to make better use of the battery performance, it is sometimes necessary to install supporting facilities such as disturbance systems and liquid addition systems, which increases the complexity of the system and the maintenance workload. The valve-regulated sealed storage battery does not need to add water, adjust the proportion of the electrolyte during the service life, has maintenance-free function, has a small self-discharge rate, good high and low temperature performance, and does not have a memory effect. There is a colloid valve-regulated sealed type battery, which uses a gas phase SO2 and dilute sulfuric acid to form a gel electrolyte, which has the advantages of a liquid-enriched battery and a valve-regulated sealed lead-acid battery, has a long service life, and has good battery consistency. There is no need to replenish the electrolyte, and there is no need to disturb the system, add liquid systems and other supporting facilities, with the advantages of maintenance-free. The use of colloidal valve-regulated sealed lead-acid batteries on power battery dual energy engineering vehicles.

Discharge performance; different manufacturers, different types of battery discharge performance is not the same, but the general trend of the curve is the same. This is mainly because when the chemical energy of the battery is converted into electrical energy, the reduction in the stored energy leads to a decrease in the terminal voltage and a decrease in the capacity. The greater the discharge current of the battery, the shorter the discharge duration and the faster the voltage drop. The nominal voltage of the lead-acid battery is 2V. When the depth of discharge (DOD) is 80%, the discharge termination voltage is about 1.8V. The locomotive battery pack contains 343 cells, and the total discharge termination voltage is 617.4V. The influence of 6 volume and weight The battery is installed on the locomotive. A necessary condition is that the volume and weight of the battery should meet the requirements of the locomotive installation and the weight. That is, after taking into account the conditions described above, it is also necessary to check the physical interface according to the actual volume and weight of the battery.

Mainly analyzes some main conditions that the electric energy storage battery dual-energy engineering vehicle considers when choosing the traction battery, and the main method of choosing the battery, and finally choose the 400A•h colloidal lead-acid battery. In the use of batteries, there are many issues to consider, such as the specific battery conditions, the battery management system.

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