Integrated DC/DC convertor and electrochemical energy storage system

A converter and electrochemical technology, which is applied in the field of DC/DC converters and electrochemical energy storage systems, can solve the problems that the working voltage range and current range cannot be satisfied, and it is difficult to apply in real vehicles, and achieve the effect of saving installation space

Active Publication Date: 2014-11-19
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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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

Method used

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  • Integrated DC/DC convertor and electrochemical energy storage system
  • Integrated DC/DC convertor and electrochemical energy storage system
  • Integrated DC/DC convertor and electrochemical energy storage system

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Embodiment 1

[0128] The electrochemical energy storage device 22 in the embodiment of the present invention is a fuel cell stack. Please also see Figure 14-15 , the output current of the fuel cell stack is disturbed by a disturbance current with a small amplitude. Since the amplitude of the current disturbance signal is small, it can ensure that the fuel cell stack exhibits a linear characteristic near the operating point A. The electrochemical AC impedance spectrum of the fuel cell stack can be obtained by calculating according to the above formula, as Figure 16 As shown, where the specific frequency can reflect the working status of different components of the fuel cell stack.

[0129] Specifically, the frequency f 0 Represents the low-frequency AC impedance of the fuel cell stack, with a typical frequency of 0.1 Hz, and is a characterization of the internal mass transfer impedance of the fuel cell stack, that is, the speed at which the fuel cell system transports reactants to the ca...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/00H01M8/04H01G11/00H01M8/24H01M10/0525
CPCY02E60/10Y02E60/50
Inventor 李建秋洪坡徐梁飞欧阳明高
Owner TSINGHUA UNIV
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