# US 5,705,915 A · Method for charging a battery

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- Number: US 5,705,915 A
- Document ID: US5705915A
- Status: Granted
- Kind: A
- Application number: 08/805,836
- Filed: 1997-03-03
- Granted: 1998-01-06
- Earliest claimed: 1997-03-03
- Assignees: Motorola, Inc.
- Inventors: Twanika D. Douglas; Joseph Patino; Michael D. Geren; William R. Williams
- Web page: https://patentgrep.com/patent/US5705915A

## CPC

- H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00)
- H02J 7/963: {in response to battery voltage gradient}
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

A method for charging a battery or battery pack (206) provides a scheme for terminating a rapid charging regime only after both a temperature and voltage threshold are exceeded. This allows a battery to continue to receive a rapid charge even when battery temperatures are rising rapidly due to external (non-charge related) conditions.

## Claims

### Claim 1

A method of charging an electrochemical cell comprising the steps of:
determining an initial cell temperature and voltage level;
initiating a rapid charging regime;
measuring the temperature of the cell at regular intervals after initiating said rapid charging regime to determine temperature increases in said cell between each regular interval;
measuring battery voltage if the temperature increase in any one regular interval exceeds a preselected temperature threshold value; and
terminating said rapid charging regime if the measured battery voltage exceeds a preselected voltage threshold value.

### Claim 2 (depends on 1)

A method as in claim 1, wherein battery temperature is measured at three minute intervals.

### Claim 3 (depends on 1)

A method as in claim 1, wherein battery voltage is measured when the temperature increase for any one regular interval exceeds 1.6.degree. C.

### Claim 4 (depends on 1)

A method as in claim 1, wherein the preselected voltage threshold value is between 9 and 10 volts.

### Claim 5

A method of determining the endpoint of a rapid charging regime for a battery cell in a battery charging device, said method comprising the steps of:
measuring temperature increase of said battery cell at regular intervals during said rapid charging regime;
measuring battery voltage if the temperature increase of said battery during any regular interval exceeds a preselected temperature threshold value; and
terminating the rapid charging regime if the measured battery voltage exceeds a preselected voltage threshold value.

### Claim 6 (depends on 5)

A method as in claim 5, wherein battery temperature is measured at three minute intervals.

### Claim 7 (depends on 5)

A method as in claim 5, wherein battery voltage is measured when the temperature increase for any one regular interval exceeds 1.6.degree. C.

### Claim 8 (depends on 5)

A method as in claim 5, wherein the preselected voltage threshold value is between 9 and 10 volts.