# US 10,310,019 B2 · System for estimating the state of health of a battery using liquid-phase diffusivity of lithium-ion parameters

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- Number: US 10,310,019 B2
- Document ID: US10310019B2
- Status: Granted
- Kind: B2
- Application number: 14/636,847
- Filed: 2015-03-03
- Published: 2016-05-12
- Granted: 2019-06-04
- Earliest claimed: 2014-11-06
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: Woo Suk Sung
- Web page: https://patentgrep.com/patent/US10310019B2

## CPC

- G01R 31/367: Software therefor, e.g. for battery testing using modelling or look-up tables
- G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R 31/392: Determining battery ageing or deterioration, e.g. state of health
- H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569)
- H01M 10/052: Li-accumulators
- H01M 10/0566: Liquid materials
- Y02E 60/10: Energy storage using batteries
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A method and system for estimating a state of health using battery model parameters are provided. The system includes a battery model parameter extractor that is configured to extract liquid-phase diffusivity of Li-ion parameters and a storage unit that is configured to store a mapping table in which states of health (SOH) for each liquid-phase diffusivity of Li-ion parameter are mapped. In addition, a SOH estimator is configured to use the mapping table to estimate the SOH that corresponds to a liquid-phase diffusivity of Li-ion extracted from the battery model parameter extractor.

## Claims

### Claim 1

A system for estimating a state of health (SOH) using battery model parameters, comprising:
a battery model parameter extractor configured to extract liquid-phase diffusivity of lithium ion (Li-ion) parameters;
a storage unit configured to store a mapping table including the SOH of a battery which are mapped to each liquid-phase diffusivity of Li-ion parameter value; and
a SOH estimator configured to estimate the SOH that corresponds to liquid-phase diffusivity of Li-ion in a liquid electrolyte extracted from the battery model parameter extractor, using the mapping table in the storage unit.

### Claim 2 (depends on 1)

The system according to claim 1, wherein the mapping table includes rated capacities and capacity fade of a battery which are mapped to each liquid-phase diffusivity of Li-ion parameter value.

### Claim 3 (depends on 2)

The system according to claim 2, wherein the SOH is calculated by dividing current rated capacity of a battery by initial rated capacity of the battery.

### Claim 4 (depends on 1)

The system according to claim 1, wherein the battery model parameter extractor is configured to collect voltage data during charging and when the charging is completed and extract the liquid-phase diffusivity of Li-ion parameter using the voltage data.