Method for determining the state of charge of rechargeable batteries by integration of the amounts of current flowing during charging and discharging
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 17, 2004
Grant Date -
May 8, 2003
app pub date -
Oct 21, 2002
filing date -
Nov 2, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a method for determining the state of charge of rechargeable batteries by integration of the amounts of current flowing during charging and discharging, a first state of charge value LZ.sub.A is determined by continuous integration of the rechargeable battery current. A second state of charge value LZ.sub.B is determined by measurement of the no-load voltage U.sub.0 after receiving or supplying a defined amount of charge Q which is sufficient in order to leave the region of the mixed potential of the electrodes and to reach a no-load voltage of the rechargeable battery, and by comparison of this measured no-load voltage U.sub.0 with empirically determined no-load voltage characteristics for the rechargeable battery. From the state of charge values obtained in this way, that state of charge value is chosen which is more reliable in the preceding operating conditions, with the assessment of LZ.sub.A taking into account in particular the charge throughput in the assessment of LZ.sub.B, in particular the amount of charge Q which has flowed. The amount of charge Q should be at least 1 to 40%, preferably 5 to 50%, of the rated capacity of the rechargeable battery.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully