IEEE Access (Jan 2024)
Energy Balance Control of Multi Group Lithium Ion Batteries Under Internet of Things Technology
Abstract
Due to the different capacity, internal resistance, electrochemical characteristics and other parameters between different lithium-ion battery cells, the energy consumption and collection speed of the battery are inconsistent during the charging and discharging process, resulting in uneven energy distribution, resulting in excessive discharge of the battery. In order to eliminate the inconsistencies of lithium-ion batteries and improve the utilization rate of groups, a control method for energy balance of multi-group lithium-ion batteries under the Internet of Things technology was proposed. Under the layered architecture of the Internet of Things, voltage information from each lithium battery is collected by the sensing layer. Subsequently, the collected data is weighted and fused using an adaptive weighted multi-sensor data fusion algorithm to enhance the accuracy and stability of the voltage information. The Controller Area Network (CAN) bus is used as the communication medium to upload the voltage information after fusion. In the application layer, multiple sets of lithium-ion battery equalization control circuits are designed. The capacitance of the capacitor is calculated using supercapacitors. Through the remote monitoring module based on Android operating system, combined with 4G Internet of Things technology, the remote monitoring of lithium-ion battery status information is realized. Experiments show that the method can effectively control the energy balance of the lithium-ion battery pack, when the experiment reaches 50 seconds, the end time of the lithium battery balance control is about 540 seconds, the balance efficiency is greater than 98%, the battery voltage standard deviation is always less than 10 mV, to ensure the balanced distribution of energy in the battery pack, and further promote the application and promotion of renewable energy.
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