Browse Prior Art Database

Individual Cell Management System for Battery Storage

IP.com Disclosure Number: IPCOM000013783D
Original Publication Date: 2000-Apr-01
Included in the Prior Art Database: 2003-Jun-18

Publishing Venue

IBM

Abstract

All current battery pack systems consider the full pack as the lowest level field replaceable module. With the use of a detection algorithm and active identification of the capacity limiting individual battery or cell, the user will experience improved pack capacity and improved service life time of the pack. The use of a detection system allows the performance of each battery module or cell to be monitored throughout the life of the power pack. This identification of the weakest battery allows it to be protected from over discharge by shutting down the pack before damage can occur due to continued use. At the point that the weakest module limits the usefulness of the pack, corrective action can be taken to replace the weakest battery or module. Batteries are electro-chemical devices, packaged in very low cost mechanical containers. The battery as a component in the battery pack experiences a relatively high failure rate. By taking action to identify the weakest devices the full pack can stay in service much longer. This active management as outlined above will reduce the cost of ownership by keeping a battery pack in service well beyond the point of failure in a conventional series pack. 1