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 System for supplying power to an apparatus and method for the assessment of the lifetime and capacity of a power-storage device

Details
Inventors: Meyerdirks, Herbert; Pietschmann, Walter;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Gaffin; Jeffrey A.
Assistant Examiner: Jackson; Stephen
Attorney, Agent or Firm: Cutter; Lawrence D.

A system for supplying power to an apparatus (170, 175) with a power-storage device (200) for storing electric power, a first measuring device (310) for measuring a first electrical quantity of the power-storage device (200), a time-determining device (360) for determining the time taken for the first electrical quantity to reach a first level, a second measuring device (320) for measuring a second electrical quantity of the power-storage device (200) and a comparator (330) for comparing the second electrical quantity relative to the determined time with a stored typical time-characteristic of the second electrical quantity. Thereby a method of assessing the lifetime and capacity of the power-storage device (200) is used with as a first step (500) the measurement of a first electrical quantity of the power-storage device (200), as a second step (510) the determination of the time taken for the first electrical quantity to reach a first level, as a third step (520) the measurement of a second electrical quantity of the power-storage device (200), as a fourth step (530) the comparison of the second electrical quantity relative to the determined time with a stored typical time-characteristic of the second electrical quantity and as a fifth step (540) the evaluation of the comparison from the fourth step for an assessment of the lifetime and capacity of the power-storage device (200).

DETAILED DESCRIPTION The invention claimed is: 1.
An apparatus for assessing the lifetime and capacity of a power storage means for supplying power to a device, said apparatus comprising: a first measuring means for measuring a first electrical quantity of the power storage means; a time determining means for determining a time on reaching a first level of the first electrical quantity characterized by: a second measuring means for measuring a second electrical quantity of the power storage means; and a comparator means for comparing the second electrical quantity relative to the determined time with a stored typical time characteristic of the second electrical quantity; whereby the first electrical quantity either is a voltage or a current, the second electrical quantity then either being the current or the voltage respectively; and the measurements being applicable during a supply of the device by the power storage means.
2.
The apparatus in accordance with claim 1 wherein the typical time-characteristic of the second electrical quantity is a typical exhausted characteristic of the exhausted power-storage device or a typical new characteristic of a virgin curve of the power-storage means.
3.
The apparatus in accordance with claim 1, further comprising: an impedance-determining means for the determination of the impedance of the power-storage means.
4.
The apparatus in accordance with claim 1, further comprising: a means for the detection of a short circuit in a cell and overcharging in the power-storage means.
5.
The apparatus in accordance with claim 1 further comprising: a power storage means for storing electrical energy.
6.
The apparatus in accordance with claim 1, further comprising: a switching unit for the disconnection of the power-storage means from the device when a minimum level of the first electrical quantity has been measured.
7.
The apparatus in accordance with claim 6, further comprising: a circuit breaker for the protection of the power-storage means from being erroneously reconnected to the device after the switching unit has disconnected the power-storage means from the device


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