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US5990660: Process for improving the charging and discharging capacity of storage batteries

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Filing Information

Inventor(s) Eberhard Meissner ·
Assignee(s) V B Autobatterie GmbH ·
Attorney/Agent(s) Schnader Harrison Segal & Lewis ·
Primary Examiner Edward H. Tso ·
Application Number US9237112
Filing date 01/26/1999
Issue date 11/23/1999
Predicted expiration date 01/26/2019
U.S. Classifications 320/127  · 320/136  ·
International Classifications H01M 1044  ·
Kind CodeA
International Classifications 320118;124;125;127;134;135;136;150;153;FOR 134 ·
Foreign Priority DE19803312 - 01/29/1998 ·
24 Claims, No Drawings


Abstract

The invention pertains to a process for improving the charging and discharging capacity of storage batteries at low temperatures. The improvement in the charging and discharging of storage batteries is accomplished by raising their temperature, using for this purpose the energy stored in the batteries. The process is conducted in such a way that the temperature and at least one value characterizing the state of charge are measured before the beginning of the heating and during the heating and the storage battery is discharged through an electrical component introducing thermal energy into it, at which time the discharge is terminated when either the target loadability in the discharging or charging was achieved or the state of charge decreases below a threshold value.

Independent Claims | See all claims (24)

  1. 1. A method of improving the charging and discharging capacity of a storage battery by raising the storage battery temperature using energy stored in said storage battery which comprises,(a) measuring a temperature and at least one state of charge value before and during heating of said storage battery,(b) discharging the storage battery through an electrical component introducing heating energy into it,(c) interrupting the discharge upon either one of two occurrences, (1) a target loadability in discharging or charging is achieved or, (2) the state of charge value decreases below a preselected threshold value.
  2. 15. A method of improving the charging and discharging capacity of a storage battery by raising the storage battery temperature using energy stored in said storage battery which comprises:(a) measuring a temperature and voltage of the storage battery before and during heating of said storage battery.(b) discharging the storage battery through an electrical component introducing heating energy into it,(c) increasing successively a discharge current used for heating with increasing storage battery temperature, said discharge current being selected to be as high as possible but no higher than a highest load current specified by the manufacturer, and wherein the voltage under load is 25% to 75% of unloaded voltage, and(d) discharging is not performed when:(1) the temperature of the storage battery is below the hardening point of its electrolyte or,(2) the state of charge value is insufficient to achieve the heating necessary to attain the target loadability of the storage battery,(e) interrupting the discharge upon one of two occurrences: a target loadability in discharging or charging is achieved or the state of charge value goes below a preselected threshold value.
  3. 22. The method of improving the charging and discharging capacity of a lithium-ion storage batteries by raising a storage battery temperature using energy stored in said storage battery which comprises:(a) measuring a temperature and voltage of the storage battery before and during heating of said storage battery,(b) discharging the storage battery through an electrical component introducing heating energy into it,(c) increasing successively a discharge current used for heating with increasing storage battery temperature, and(d) discharging is not performed when:(1) the temperature of the storage battery is below the hardening point of its electrolyte or,(2) the state of charge value is insufficient to achieve the heating necessary to attain the target of the storage battery,(e) interrupting the discharge upon one of two occurrences: a target loadability in discharging or charging is achieved or the state of charge value goes below a preselected threshold value,(f) polarization of a negative electrode by more than 0.8 V than potential of metallic lithium in the cell is avoided.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US5395706 Space Systems/Loral, Inc. Hall Mar 1995
US5488283 Globe-Union, Inc. Dougherty et al. Jan 1996
US5508126 Braun Apr 1996

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
DE4142628May 1993