Method of structuring comparative reference value used in battery SOC estimating method for dynamic pattern

• US 20060244458A1
• Filed: 03/17/2006
• Published: 11/02/2006
• Est. Priority Date: 03/17/2005
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Do Youn, Cho, Il
• Granted Patent: US 7,466,138 B2
• Time in Patent Office: Days
• US Class Current: 324/426
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: G01R 1/28 Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

Disclosed is a method for structuring a comparative reference value used to estimate a residual charge (SOC; State of Charge) of a battery. The method comprises comprising steps of: measuring open circuit voltages (OCV) and residual capacities (SOC) of a battery at various temperatures and tabling them according to the temperatures; measuring an open circuit voltage (OCV1) at a temperature before a test; carrying out a discharge capacity counting (Ah-counting) for the battery using a measurement apparatus while carrying out a dynamic pattern test; providing a sufficient relaxation time period for the battery after ending the dynamic pattern test; measuring an open circuit voltage (OCV2) at a temperature after the sufficient relaxation time period; obtaining residual capacity values of the battery corresponding to the measured open circuit voltages (OCV1, OCV2) from the table; assuming a difference between the above-obtained two residual capacity values as a δSOC and calculating an 1C-rated capacity based on the δSOC; and applying the calculated rated capacity as a denominator of the discharge capacity counting to calculate an exact residual capacity of the battery.

Claims

1. A method for structuring a comparative reference value used to estimate a residual capacity of a battery for a dynamic pattern, the method comprising steps of:

measuring open circuit voltages (OCV) and residual capacities (SOC) of a battery at various temperatures and tabling them according to the temperatures;

measuring an open circuit voltage (OCV1) at a temperature before a test;

carrying out a discharge capacity counting (Ah-counting) for the battery using a measurement apparatus while carrying out a dynamic pattern test;

providing a sufficient relaxation time period for the battery after ending the dynamic pattern test;

measuring an open circuit voltage (OCV2) at a temperature after the sufficient relaxation time period;

obtaining residual capacity values of the battery corresponding to the measured open circuit voltages (OCV1, OCV2) from the table;

assuming a difference between the above-obtained two residual capacity values as a δ

SOC and calculating an 1C-rated capacity based on the δ

SOC; and

applying the calculated rated capacity as a denominator of the discharge capacity counting to calculate an exact residual capacity of the battery.