Research And Design Of The Aluminum-Air Battery Online Monitering System

With the rapid development of economy, car, as a walking tool, gradually entered people’s daily life. However, the environmental and energy issues caused by ever growing number of cars are also increasingly prominent. At this stage, countries are gradually aware of the seriousness of the environmental and energy problems. And the problem has been risen to the height of country persistent development. So, relevant researchers at home and abroad are actively devoted to the development of electric cars.Battery and it’s management monitoring technology has been one of the key factors to restrict the commercial of electric cars.The estimation accuracy of it’s state of charge(SOC) is the emphasis and difficulty in this field of research.In this paper, based on the study of Aluminum-air power battery, design a set of on-line monitoring system based on Aluminum-air power battery and focuses on the Aluminum-air battery SOC estimation.Specifically, this paper mainly includes the following content:Firstly, the principle of Aluminum-air battery is introduced, and the characteristics of Aluminum-air battery is analyzed based on the electric car vehicle power battery key performance indicators. The features of Aluminum-air battery is without charge, high specific energy, safe and reliable, abundant raw material sources and so on. From the perspective of technology and performance, it can be found that Aluminum-air battery is far suit for power supply of car than other batteries(e.g., battery, etc.).Secondly, the Aluminum-air battery SOC estimation is introduced in detail. According to the discharge characteristics of the Aluminum-air battery, the Ampere-hour SOC estimation method combined with the HSMM model is proposed. The voltage of Aluminum-air battery appears weak gradient descent rule near the end of the discharge, and HSMM modeling of this degradation process is carried out. That is to say, in the late stage of the battery discharge, according to the changes of battery characteristics, the battery is divided into several different degraded states; For each state, the model can produce several observation values. The battery available time of each state can be accurately predicted by the transition probabilities between each states and residence time of each state. The test simulation is given to verify the feasibility of this method. The predicted value by this method is more accurately than by single ampere-hour method.Thirdly, the hardware design of the battery monitoring system is introduced, including the main control module, storage module, sampling module, communication module, power module, CAN bus and serial communication module.Finally, the software and platform design of the Aluminum-air battery online monitoring system is introduced, mainly including the design of sampling procedures, CAN communication program design, serial port communication, monitoring platform for software design and so on, and the feasibility of the system is verified by the platform experiments.