The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 1996
Filed:
Nov. 14, 1994
Dieter Hanselmann, Ohringen, DE;
Bernd Mayer, Walldorf, DE;
Karl-Diether Nutz, Oedheim, DE;
Stepfan-Peter Weller, Bad Friedrichshall, DE;
Temic Telefunken microelectronic GmbH, Heilbronn, DE;
Abstract
The invention relates to a charging method for storage batteries, in particular for NiCd and NiMH cells. According to the invention, the rise in the charging voltage during each of a number of consecutive charging cycles of a specified duration is measured in the form of a unit corresponding to a certain voltage. The number of these units is transmitted in the form of a counting pulse to two up-down counters during the period of the charging cycle, whereby one counter functions in the down mode and is set at the beginning of a charging cycle to a number corresponding to the number of units established in the preceding charging cycle. In the following charging cycle, the roles of the two counters are reversed, so that the up-counter is now set to the down mode and the other counter to the up mode, whereby the latter is set to a Certain starting counting status. At the end of each charging cycle, the final status of the down counter is compared with the specified starting status, from which a switch-off criterion is derived for the charging process. According to the invention, this process enables both positive and negative changes in the dU/dt value of the charging curve to be detected with a high voltage resolution and, at the same time, minimal cost.