Integrated DC/DC convertor and electrochemical energy storage system

Abstract

The invention relates to an integrated DC / DC convertor, which comprises a first DC / DC convertor, a second DC / DC convertor, a first voltage transducer, a second voltage transducer, a first electric current transducer, a second electric current transducer, a third electric current transducer and a controller, wherein the first DC / DC convertor is in parallel connection with the second DC / DC convertor; on / off of the second DC / DC convertor is controlled by the controller; the electrochemical alternating current impedance frequency spectrum of the electrochemical energy storage system is obtained through that the second DC / DC convertor in the open state is controlled to regulate and control the electric current of the output end of the electrochemical energy storing device in a current disturbance manner.

Description

technical field [0001] The present invention relates to a DC / DC converter and an electrochemical energy storage system, in particular to an integrated DC / DC converter capable of monitoring the working state of a battery and an electrochemical energy storage system including the integrated DC / DC converter. Background technique [0002] Hydrogen-oxygen proton exchange membrane fuel cell (Proton Exchange Membrane Fuel Cell, referred to as PEMFC) is an electrochemical device that directly converts chemical energy into electrical energy. The energy conversion of traditional internal combustion engines is limited by the Carnot cycle, while hydrogen-oxygen proton exchange membrane fuel cells Energy conversion is not limited by the Carnot cycle, and theoretically its energy conversion efficiency is higher. Because the substances involved in the reaction are hydrogen and air, the reaction product is water, and no harmful emissions are produced, so it is favored by people and graduall...

AI Technical Summary

Problems solved by technology

In order to obtain the resistance and capacitance parameters in the equivalent circuit of the fuel cell, it is necessary to carry out AC impedance research. The commercialized AC impedance analysis equipment currently on the market, such as the products developed by Japan's KIKUSUI Kikusui Company and the UK's Solarton Company, have a price of 100,000 yuan. Its operating voltage range and current range cannot meet the requirements of the existing fuel cell bus system, and it is naturally difficult to achieve large-scale real vehicle applications

Images