Method and device for calculating residual electric energy of electric energy storage equipment and power supply system

Abstract

The invention discloses a method and a device for calculating residual electric energy of electric energy storage equipment and a power supply system. The method comprises the following steps: acquiring a plurality of corresponding output voltages of target electric energy storage equipment at a plurality of time points in a discharging process; establishing a voltage-time fitting model of the target electric energy storage equipment according to the plurality of corresponding output voltages at the plurality of time points; determining the discharge current of the target electric energy storage equipment; and determining the residual electric energy of the target electric energy storage equipment according to the discharge current and the voltage-time fitting model. Therefore, the fitting model of the target electric energy storage equipment can be established based on the relation between the output voltage and the time acquired in the discharging process, so that the real-time calculation of the residual electric energy of the target electric energy storage equipment is realized, and a more accurate calculation effect and higher calculation timeliness are realized.

Description

technical field [0001] The invention relates to the technical field of electric energy storage, in particular to a method, device and power supply system for calculating remaining electric energy of electric energy storage equipment. Background technique [0002] The development of electric energy storage technology has made electric energy storage equipment such as lithium batteries and rechargeable batteries gradually become popular energy storage equipment and power supply equipment, and the calculation of the remaining electric energy parameters of electric energy storage equipment has gradually become a measure of the quality of electric energy storage equipment. important step in the situation. However, the existing residual power calculation schemes generally only focus on establishing the mapping relationship between a fixed output voltage and residual power through experiments, so as to determine the residual power of the electric energy storage device through the d...

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Problems solved by technology

However, the existing residual power calculation schemes generally only focus on establishing the mapping relationship between a fixed output voltage and residual power through experiments, so as to determine the residual power of the electric energy storage device through the detected output voltage by looking up the table. Electric energy, but this method requires pre-experimentation to obtain the mapping relationship, which cannot be calculated in real time, and because the mapping relationship between the output voltage of different types of electric energy storage devices and the remaining electric energy is uncertain, the existing remaining electric energy calculation The calculation accuracy and efficiency of the scheme are limited, and it is urgent to study a more accurate and efficient remaining power calculation scheme

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