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USE OF LITHIUM HYBRID LAYER CAPACITOR IN METERING EQUIPMENT

IP.com Disclosure Number: IPCOM000130595D
Publication Date: 2005-Oct-28
Document File: 2 page(s) / 23K

Publishing Venue

The IP.com Prior Art Database

Abstract

With increased emphasis on power quality and power availability, the capability to inform a utility or energy service provider that a power interruption has occurred is also more important. This capability previously has been provided with Ni-Cad rechargeable cells or with lithium primary cells. Each of these technologies has its own limitations. Because of the wide operating temperature range required in the meter environment, other battery technologies are typically unusable.

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USE OF LITHIUM HYBRID LAYER CAPACITOR IN METERING EQUIPMENT

Background:

With increased emphasis on power quality and power availability, the capability to inform a utility or energy service provider that a power interruption has occurred is also more important. This capability previously has been provided with Ni-Cad rechargeable cells or with lithium primary cells. Each of these technologies has its own limitations. Because of the wide operating temperature range required in the meter environment, other battery technologies are typically unusable.

The Ni-Cad cells have a limited capacity (A-Hr), but more importantly, the life of the cells are limited. There is a significant cost for the utility to visit the meter site to replace the battery.

The lithium primary cells have excellent life characteristics, but because they are a primary cell, the battery is unable to be recharged and thus can make only a certain number of outage calls. Many lithium cells also have a condition called transient minimum voltage that limits the available power than can be delivered by the battery.

Invention:

This discussion describes several applications of a new type of energy storage cell called a hybrid layer capacitor, HLC. The HLC has the characteristics of a capacitor that stores energy, can delivery that energy to a load quickly, and has a long service life. However, it has an energy storage capability of many orders of magnitude more than traditional capacitor technologies. Because it is rechargeable, it can be used for many outage calls. Because it has a long life, it will last the life of the meter and not need to be replaced. Because it has a large energy density, and HLC that can easily fit into a meter enclosure can power at least parts of the meter for an extended period of time. Presently the HLCs are used with a traditional lithium thionyl chloride cells to provide a larger power delivery capability than would be available with the lithium cells alone.

1.                  These capabilities make the HLC fit the outage cal...