Battery online impedance spectroscopy detection system and method based on digital modules

Abstract

The invention discloses a battery online impedance spectroscopy detection system and method based on digital modules. The system comprises digital modules, a central controller, a current sampling module and an inductor L. The M (>=2) digital modules are sequentially connected in series to form a battery string system, the inductor L is connected in series in the battery string system, and the serial system is connected between a positive direct current bus Bus + and a negative direct current bus Bus-. The current sampling module is connected between the inductor L and the controller, and is used for collecting the real-time current flowing through the inductor L, converting the real-time current into a digital signal through an ADC (Analog to Digital Converter) and transmitting the digital signal into the controller. The controller has a level signal output function, and outputs control signals to the digital modules through an input / output port IO. According to the invention, periodic signal excitation is carried out on the battery string, and then real-time voltage and current sampling is carried out to detect the response of a tested equivalent battery to the excitation. Further, the impedance spectrum of the equivalent battery can be calculated.

Description

technical field [0001] The invention belongs to the technical field of battery online impedance spectrum detection, and in particular relates to a battery online impedance spectrum detection system and method based on a digital module. Background technique [0002] As the pressure on the environment caused by traditional energy, transportation and other industries increases year by year, the society's demand for new energy is becoming stronger and stronger. The government has also issued a large number of policies to encourage and support the rapid development of the new energy industry. [0003] In the new energy industry, electrochemical cells are widely used as energy storage devices to provide power supply. For example, in new energy power generation systems, batteries need to be used as energy storage devices to support the power grid; in new energy electric vehicles, lithium-ion batteries are used as vehicle power sources; Basic power usage. [0004] Due to the low ...

AI Technical Summary

Problems solved by technology

Since the frequency range is often wide, it takes a lot of time to generate a wide frequency range trace signal due to the huge cost of the equipment and the limited number of channels that can be detected

At the same time, due to the inability to detect online, the problems existing in the power supply unit cannot be found in real time, and there is a huge risk of missed detection

Due to the need for offline detection, the series power supply system will not work normally and will cause loss of revenue, especially in the fields of new energy vehicles, etc. It is not allowed, or repeated resource investment is required to ensure the uninterrupted power supply of the system, the system costs will multiply

Existing impedance spectroscopy detection devices require an additional excitation source, resulting in high investment costs for detection equipment, which is not conducive to the healthy development of battery products in the new energy industry

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