Open and Flexible Li-ion Battery Tester Based on Python Language and Raspberry Pi

Abstract

Technology improvements and cost reduction allow electrochemical energy storage systems based on Lithium-ion cells to massively be used in medium-power applications, where the low system cost is the major constraint. Battery pack maintenance services are expected to be required more often in the future. For this reason, a low-cost instrumentation able to characterize the cells of a battery pack is needed. Several works use low-cost programmable units as Li-ion cell tester, but they are generally based on proprietary-software running on a personal computer. This work introduces an open-source software architecture based on Python language to control common low-cost commercial laboratory instruments. The Python software application is executed on a Raspberry Pi board, which represents the control block of the hardware architecture, instead of a personal computer. The good results obtained during the validation process demonstrate that the proposed cell station tester features measurement accuracy and precision suitable for the characterization of Li-ion cells. Finally, as a simple example of application, the state of health of twenty 40 Ah LiFePO4 cells belonging to a battery pack used in an E-scooter was successfully determined.

Registro holográfico estabilizado utilizando um computador de placa única

“…O que se verifica é que o controlador baseado na placa Raspberry Pi não é capaz de operar à frequência máxima [38], que é limitada pelos periféricos e protocolos de comunicação, pois ele também depende da capacidade de processamento do sistema operacional da placa [39].…”