摘要:
An AC component ”I addition unit (510) of a diagnostic device (5) superimposes an alternating current on an output current of a fuel cell (10). A Zn calculation unit (520) calculates a cell impedance with respect to the alternating current with regard to any of a plurality of cells (10a). A diagnosis unit (530) diagnoses that any cell (10a) is subjected to hydrogen deficiency when an absolute value of the cell impedance exceeds (absolute value of a reference impedance + a predetermined value ²). It is diagnosed that any cell (10a) is subjected to oxygen deficiency when the absolute value of the cell impedance is smaller than (absolute value of the reference impedance-a predetermined value ±).
摘要:
The present invention relates to positive electrode active substance particles for non-aqueous electrolyte secondary batteries, comprising an oxide having a spinel structure and comprising at least Li and Mn as main components and an oxide comprising at least Li and Zr, in which the oxide comprising at least Li and Zr forms a mixed phase comprising two or more phases, and a content of the oxide comprising at least Li and Zr in the positive electrode active substance particles is 0.1 to 4% by weight. The present invention provides positive electrode active substance particles for non-aqueous electrolyte secondary batteries which are excellent in high-temperature characteristics and a process for producing the positive electrode active substance particles, and a non-aqueous electrolyte secondary battery.
摘要:
Die Erfindung betrifft ein Verfahren zur Bestimmung kritischer Betriebszustände an einem Brennstoffzellenstack, bestehend aus in Serie geschalteten Einzelzellen, wobei dem Brennstoffzellenstack ein niederfrequentes Strom- oder Spannungssignal eingeprägt, das sich ergebende Spannungs- oder Stromsignal gemessen und der Klirrfaktor thd bestimmt wird. Erfindungsgemäß wird zur Bestimmung eines mit der stöchiometrischen Unterversorgung der Anoden- und/oder Kathodenseite des Brennstoffzellenstack korrelierenden Indikators THDA low media die gewichtete Summe aus einem vom Innenwiderstand R i abhängigen Term, einem vom Klirrfaktor thd abhängigen Term und einem von der Impedanz R lm des niederfrequenten Signals abhängigen Term herangezogen, wobei der Indikator THDA low media gemäß THDA lowmedia = α 1 ⋅ f 1 thd + α 2 ⋅ f 2 R i + α 3 ⋅ f 3 R lm ermittelt wird, wobei α 1 + α 2 + α 3 = 1 gilt sowie f1 und f2 Polynome oder logarithmische Funktionen sind.
摘要:
The invention relates to a novel module for an HTE reactor or an SOFC fuel cell, the module comprising a circuit for the circulation of a gas, in addition to the reactive gases required for the electrolysis reaction or the reverse reaction in an SOFC cell, the circuit enabling, during the operation under pressure, the additional gas to equalise, on one side of the glass- and/or vitroceramic-based seals, the pressure of the reactive gases generated on the other side.
摘要:
The present disclosure is directed to a method for tuning the performance of at least one electrochemical cell of an electrochemical cell stack. The method includes supplying power to an electrochemical cell stack. The electrochemical cell stack includes a plurality of electrochemical cells. The method further includes monitoring a parameter of at least one electrochemical cell and determining if an electrochemical cell becomes impaired. The method also includes diverting a fraction of the current flow from the impaired electrochemical cell during operation of the electrochemical cell stack.
摘要:
The invention relates to a method for determining critical operating states in a fuel cell stack, consisting of single cells connected in series, wherein a low-frequency current or voltage signal is applied to the fuel cell stack, the resulting voltage or current signal is measured and the distortion factor thd is determined. According to the invention, the weighted sum of a term dependent on the membrane resistance Rm and a term dependent on the distortion factor thd is used to determine an indicator THDA dryout correlating with the drying out of the fuel cell membranes of the fuel cell stack, the membrane resistance Rm being detected by impedance measurement.
摘要:
In an electrolyte sheet for a solid oxide fuel cell according to the present invention, the number of flaws on at least one of surfaces of the sheet detected by a fluorescent penetrant inspection is 30 points or less in each of sections obtained by dividing the sheet into the sections each measuring 30 mm or less on a side. A unit cell for a solid oxide fuel cell according to the present invention comprises a fuel electrode, an air electrode, and the electrolyte sheet for a solid oxide fuel cell according to the present invention, which is disposed between the fuel electrode and the air electrode. A solid oxide fuel cell of the present invention includes the unit cell for a solid oxide fuel cell according to the present invention.
摘要:
A method is provided for mitigating hydrogen evolution within a flow battery system that includes a plurality of flow battery cells, a power converter and an electrochemical cell. The method includes providing hydrogen generated by the hydrogen evolution within the flow battery system to the electrochemical cell. A first electrical current generated by an electrochemical reaction between the hydrogen and a reactant is sensed, and the sensed current is used to control an exchange of electrical power between the flow battery cells and the power system and method for sensing and mitigating hydrogen evolution within a flow battery systemconverter.