Abstract
Using temperature as the main state basis for sorting the LiFePO4 battery can solve the problem of insufficient response to the internal working state of the cell. By tracking and monitoring the status of each cell inside the module, which can reflect the consistency of the complex system after large-capacity grouping. Here, the dynamic temperature change of the LiFePO4 battery is detected, the temperature rise and the temperature rise rate are compared. The corresponding temperature rise rate of the old cell were significantly higher than the new cell. The temperature difference can be used to judge the consistency of the single cells in the battery module.
Highlights
When electric energy or heat energy of the battery pack input and output, the same degree of the parameters, like voltage, state of charge, temperature, capacity, its decay rate, self-discharge rate and its changes over time etc., between single cells were called the consistency of the battery [1,2,3,4]
By tracking and monitoring the status of each cell inside the module, which can reflect the consistency of the complex system after large-capacity grouping
Due to the internal aging of the old cell was larger than the new cell, the aging of the cell and the change of internal resistance will be reflected by the heat generation in the working state
Summary
When electric energy or heat energy of the battery pack input and output, the same degree of the parameters, like voltage, state of charge, temperature, capacity, its decay rate, self-discharge rate and its changes over time etc., between single cells were called the consistency of the battery [1,2,3,4]. As the number of single cells increase, the differences between the monomers obvious significantly. More than a dozen single batteries were generally selected for series battery in electric bicycles, but hundreds or even thousands of battery cells were applied in electric vehicle, so the inconsistency caused by the differences between the individual cells will be more obvious [6]. The inconsistency of the single cells in the battery pack affected the correct judgment of the state of charge and health of the battery pack, and caused the capacity degradation and life expectancy of the battery pack, and may even cause safety problems [7]
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