Method for monitoring end of life for battery
US6167309A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1997 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Sep 15, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02J2310/23
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system is described which has a battery, a device which is powered by the battery in an episodic manner, and a charge storage capacitor, the system having a device(s) attached to the charge storage capacitor which is capable of: PA1 g) reading the rate of charge storage or PA1 h) measuring both time and charge stored or added to the charge storage capacitor so that a rate of charge storage may be calculated. The use of this system allows for easy estimation of the estimated replacement time for the battery, particularly for a lithium battery in a pacing device. A process for estimating a level of energy depletion in the system may comprise; PA1 d) finding a relatively quiescent period in powering of the device in the episodic manner, PA1 e) determining a rate of charging in the storage capacitor during the quiescent period, and PA1 f) correlating the rate of charging in the storage capacitor to a value of internal resistance in the battery through a comparison with known relationships for the battery and rate of charging to determine a value for the internal resistance of the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.