# US 2013/0278221 A1 · Method of detecting battery degradation level

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- Number: US 2013/0278221 A1
- Document ID: US20130278221A1
- Status: Published application
- Kind: A1
- Application number: 13/976,667
- Filed: 2011-12-27
- Published: 2013-10-24
- Earliest claimed: 2010-12-28
- Inventors: Reizo Maeda
- Web page: https://patentgrep.com/patent/US20130278221A1

## CPC

- B60L 3/0046: {relating to electric energy storage systems, e.g. batteries or capacitors}
- B60L 8/003: {Converting light into electric energy, e.g. by using photo-voltaic systems}
- B60L 50/51: characterised by AC-motors
- B60L 58/13: Maintaining the SoC within a determined range
- B60L 58/15: Preventing overcharging
- B60L 58/16: responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
- 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 10/486: {for measuring temperature}
- H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- B60L 2240/545: Temperature
- B60L 2240/547: Voltage
- B60L 2240/549: Current
- G01R 31/367: Software therefor, e.g. for battery testing using modelling or look-up tables
- H01M 10/465: {with solar battery as charging system}
- H01M 2220/10: Batteries in stationary systems, e.g. emergency power source in plant
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H02J 7/82: Control of state of charge [SOC]
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 90/14: Plug-in electric vehicles
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- 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
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The method of detecting battery degradation level detects the change in residual capacity (ΔSOC) for one charging period or one discharging period of a battery 1 being charged and discharged. Weighting factors that establish degradation level according to the value of ΔSOC are pre-stored in memory, and based on the stored data; weighting factors are determined from the detected ΔSOC to determine the battery 1 degradation level from the weighting factors.

## Claims

### Claim at position 1

1-11. (canceled)

### Claim 12

A method of detecting battery degradation level, the method comprising:
detecting a ΔSOC being a residual capacity change for one charging period or one discharging period of a battery being charged and discharged;
determining a weighting factors that establish degradation level according to the value of ΔSOC, the weighting factors being pre-stored in memory; and
detecting the battery degradation level from the weighting factors.

### Claim 13 (depends on 12)

The method of detecting battery degradation level as cited in claim 12, wherein battery storage temperature and conducting temperature are measured, weighting factors corresponding to storage temperature and conducting temperature are pre-stored in memory, and based on the stored data, the battery degradation level is detected from weighting factors determined from the detected storage temperature and from weighting factors determined from the detected conducting temperature.

### Claim 14 (depends on 12)

The method of detecting battery degradation level as cited in claim 12, wherein battery current and conducting temperature are measured, weighting factors corresponding to current and conducting temperature are pre-stored in memory, based on the stored data, weighting factors are determined from the detected current and conducting temperature, and the battery degradation level is detected from the determined weighting factors.

### Claim 15 (depends on 12)

The method of detecting battery degradation level as cited in claim 12, wherein the allowable battery current limit is stored in memory, and the accumulated time that the current limit is exceeded is detected to determine the battery degradation level.

### Claim 16 (depends on 12)

The method of detecting battery degradation level as cited in claim 12, wherein upper and lower battery voltage limits are stored in memory, and the accumulated time that the upper and lower voltage limits are exceeded are detected to determine the battery degradation level.

### Claim 17 (depends on 12)

The method of detecting battery degradation level as cited in claim 12, wherein the accumulated time in each battery storage temperature range is recorded in memory and battery degradation level is detected based on the stored data.

### Claim 18 (depends on 12)

The method of detecting battery degradation level as cited in claim 12, wherein the accumulated time in each battery conducting temperature range is recorded in memory, and battery degradation level is detected based on the stored data.

### Claim 19 (depends on 12)

The method of detecting battery degradation level as cited in claim 12, wherein the accumulated time in each ΔSOC range is recorded in memory, and battery degradation level is detected based on the stored data.

### Claim 20 (depends on 12)

The method of detecting battery degradation level as cited in claim 12, used in an application that controls battery charging and discharging within a pre-set residual capacity (SOC [%]) range.

### Claim 21 (depends on 20)

The method of detecting battery degradation level as cited in claim 20 used in a battery that supplies power to a motor to drive a vehicle.

### Claim 22 (depends on 20)

The method of detecting battery degradation level as cited in claim 20 applied to a battery used in a power source that stores solar cell power.