METHODOLOGY FOR CHARGING BATTERIES SAFELY
First Claim
1. A fault-detection apparatus for a charging system that charges a collection of interconnected battery cells, the apparatus comprising:
- a) a data-acquisition system for receiving a set of data parameters from the collection while the charging system is actively charging the collection, the set of data parameters measured during a charge cycle that begins with V<
Vmax and deltaT<
(deltaT)max, wherein deltaT is a maximum difference in temperature between the cells throughout the collection and an ambient temperature, wherein (deltaT)max is a maximum acceptable difference in temperature that affects a change in voltage or current during charging;
b) a monitoring system evaluating said set of data parameters to identify a set of anomalous conditions; and
c) a controller comparing said set of anomalous conditions against a set of predetermined profiles indicative of an internal short in one or more cells of the collection, said controller establishing an internal-short state for the collection when said comparing has a predetermined relationship to said set of predetermined profiles.
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Accused Products
Abstract
An apparatus and method for identifying a presence of a short circuit in a battery pack. A fault-detection apparatus for a charging system that rapidly charges a collection of interconnected lithium ion battery cells, the safety system includes a data-acquisition system for receiving a set of data parameters from the collection while the charging system is actively charging the collection; a monitoring system evaluating the set of data parameters to identify a set of anomalous conditions; and a controller comparing the set of anomalous conditions against a set of predetermined profiles indicative of an internal short in one or more cells of the collection, the controller establishing an internal-short state for the collection when the comparing has a predetermined relationship to the set of predetermined profiles.
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Citations
1 Claim
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1. A fault-detection apparatus for a charging system that charges a collection of interconnected battery cells, the apparatus comprising:
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a) a data-acquisition system for receiving a set of data parameters from the collection while the charging system is actively charging the collection, the set of data parameters measured during a charge cycle that begins with V<
Vmax and deltaT<
(deltaT)max, wherein deltaT is a maximum difference in temperature between the cells throughout the collection and an ambient temperature, wherein (deltaT)max is a maximum acceptable difference in temperature that affects a change in voltage or current during charging;b) a monitoring system evaluating said set of data parameters to identify a set of anomalous conditions; and c) a controller comparing said set of anomalous conditions against a set of predetermined profiles indicative of an internal short in one or more cells of the collection, said controller establishing an internal-short state for the collection when said comparing has a predetermined relationship to said set of predetermined profiles.
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Specification