Title: Systems and related methods for determining self-discharge currents and internal shorts in energy storage cells

Abstract

Systems and methods for determining self-discharge currents in an energy storage cell and detecting internal shorts are disclosed. A system includes a DC voltage source configured to provide a constant test voltage selected to be less than an open-circuit voltage of an energy storage cell to the energy storage cell. The system also includes a current measuring device operably coupled between the DC voltage source and the energy storage cell, and control circuitry operably coupled to the current measuring device. A method includes applying the constant test voltage, and measuring the test current flowing between the DC voltage source and the energy storage cell until after the test current switches from a negative current to a positive current. The method also includes determining a self-discharge current of the energy storage cell by analyzing the measured test current with computational models that capture physical processes tied to the test methods.

Inventors:

Sazhin, Sergiy V.; Dufek, Eric J.; Gering, Kevin L.

Issue Date:

2018-07-31

Research Org.:

Idaho National Lab. (INL), Idaho Falls, ID (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1464607

Patent Number(s):

10036779

Application Number:

14/954,446

Assignee:

Battelle Energy Alliance, LLC (Idaho Falls, ID)

Patent Classifications (CPCs):

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES

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Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

Y02E60/10 - Energy storage

G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES

G01R31/52 - Testing for short-circuits, leakage current or ground faults
G01R31/382 - Arrangements for monitoring battery or accumulator variables, e.g. SoC

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01M - PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY

H01M10/42 - Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells

G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES

G01R31/003 - {Environmental or reliability tests
G01R31/396 - Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01M - PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY

H01M10/425 - {Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing

G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES

G01R31/3648 - {comprising digital calculation means, e.g. for performing an algorithm}

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DOE Contract Number:  

AC07-05ID14517

Resource Type:

Patent

Resource Relation:

Patent File Date: 2015 Nov 30

Country of Publication:

United States

Language:

English

Subject:

25 ENERGY STORAGE