Browse Prior Art Database

Battery Pack Terminal Usage for Quick Charging

IP.com Disclosure Number: IPCOM000105740D
Original Publication Date: 1993-Sep-01
Included in the Prior Art Database: 2005-Mar-20
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Furukawa, N: AUTHOR [+2]

Abstract

This article relates to a number of terminals and their usage in a detachable battery pack for rechargeable battery powered systems, e.g., notebook PCs, video cameras, and so forth. The disclosed configuration enables the quick charging of the battery pack without the use of additional switches.

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Battery Pack Terminal Usage for Quick Charging

      This article relates to a number of terminals and their usage
in a detachable battery pack for rechargeable battery powered
systems, e.g., notebook PCs, video cameras, and so forth.  The
disclosed configuration enables the quick charging of the battery
pack without the use of additional switches.

      The figure shows the concept of the battery pack disclosed.  In
the figure, a battery pack is composed of, at least, two, for
example, N pieces of battery cells.  All the terminals (both + and
-), the number of which is twice (N x 2) that of the cells (N) in the
pack, are exposed out of the package.  The connecting configuration
of the terminals is defined by the system for power supplying and
charging.

      While the system is operating, the terminals of the same
polarity are connected together.  In other words, the battery cells
are connected in parallel.  In this configuration, the output voltage
is defined by the single battery cell.  The number in the parallel
connection does not affect the output voltage of the pack.  The total
battery capacity can be increased by adding the cells in the parallel
connection without changing the circuit in the system.

      But the required battery charging time becomes longer in
proportion to the number in the parallel connection, as long as the
charge current is within the nominal value of the battery cell
specifications.  The charge current uniformity wo...