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A method for judging single-chip battery faults by differential curvature method

A monolithic battery, differential curvature technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of frequent failures of fuel cell systems, cumbersome use by customers, and not widely used, and achieve good stack control effect, easy to use. Understanding, the effect of improving the utilization of the input volume

Active Publication Date: 2021-05-11
BEIJING NOWOGEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-chip fuel cell voltage inspection system has the following disadvantages: it will reduce the volume power density of the fuel cell stack, the installation is cumbersome, the requirements for the PCB are high, and the customer's use is too cumbersome, etc.
Among them, the single-chip battery inspection system provides the voltage status of the stack during operation, and compares it with the alarm value of the host computer to determine whether the system alarms and shuts down, which leads to frequent failures of the fuel cell system and high shutdown frequency
However, the AC impedance method is an offline test of equipment based on AC impedance testing instruments, which is not widely used in actual products, and it also increases the cost.

Method used

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  • A method for judging single-chip battery faults by differential curvature method
  • A method for judging single-chip battery faults by differential curvature method
  • A method for judging single-chip battery faults by differential curvature method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0064] Example 1: Logical operation of method 1, method 2, method 3 and the signals from the fuel cell (current density, valve signal status, valve power supply status, sensor signal status, air compressor status, and other components), for example: Primary condition: low current density & low average monolithic voltage & , f”(I)0, secondary condition: no abnormalities in sensors, valves, etc., judgment result: MEA abnormal.

example 2

[0065] Example 2: Primary condition: f(I+ΔI)-f(I)=0, ΔI>0 (peak power area), secondary condition: no abnormalities in sensors, valves, etc., peak current is less than the factory value, and the service time is longer Short, judgment result: the stack reaction condition is abnormal.

example 3

[0066] Example 3: Combining the overpotential of the B-V equation or the Tafel slope to determine the life of the stack.

[0067] Compared with the current application mode of the traditional electric stack that adopts single-chip voltage scanning, the invention significantly improves the utilization rate of the input quantity of the closed-loop system. A simple, easy-to-use and easy-to-understand detection and control method is provided for fuel cells, such as catalyst agglomeration caused by water blocking and anti-electrode, or power generation capacity problems caused by the decline of proton exchange membrane exchange capacity under free radical attack, etc.

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Abstract

The present invention relates to a method for judging the failure of a single-chip battery by differential curvature method, comprising the following steps: obtaining the fuel cell IP curve based on the plane coordinate system through fitting and calculation, and according to the current data of each point on the IP curve and the current data of each point Tangent geometric image, the different states of each point on the stack IP curve can be obtained through calculation, comparison and analysis, and the collection of peak power, activation polarization area or ohmic polarization area, fault and concentration polarization area can be obtained according to the differential operation of the voltage curve , according to the arctangent function of the calculated resistance curve and the concavity and convexity of the function, the activation polarization area, ohmic polarization area, concentration polarization area and fault area can be obtained. Through the "and", "or", "not "To more accurately judge the state of the stack, in order to achieve better control of the stack. The invention significantly improves the utilization rate of the input quantity of the closed-loop system, and provides the fuel cell with an easy-to-use and easy-to-understand detection and control mode.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for judging the failure of a single-chip battery by a differential curvature method. Background technique [0002] A fuel cell is a chemical device that directly converts the chemical energy of fuel into electrical energy, also known as an electrochemical generator. It is the fourth power generation technology after hydropower, thermal power and atomic power. Since the fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electrical energy through an electrochemical reaction, it is not limited by the Carnot cycle effect, so the efficiency is high. In addition, fuel cells use fuel and oxygen as raw materials, without mechanical transmission parts, so there is no noise pollution, and the emission of harmful gases is very small. Fuel cells are ideal for transportation, stationary power generation, and portable applications. From the perspect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04664H01M8/04992G06F17/15
CPCG06F17/15H01M8/04679H01M8/04992Y02E60/50
Inventor 方明欧阳洵陈真
Owner BEIJING NOWOGEN TECH CO LTD