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BATTERY REVERSE INSERTION DETECTOR

IP.com Disclosure Number: IPCOM000006806D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2002-Feb-04
Document File: 1 page(s) / 56K

Publishing Venue

Motorola

Related People

Timothy G. Sheppard: AUTHOR [+2]

Abstract

The use of lithium batteries is a growing practice in todays industry. They provide a high capacity per amount of space used. The problem with lithium batteries is that they react poorly to charging. The reaction can range from an explosion to a discharge of the batteries inter- nal chemicals.

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M-LA INC. Technical Developments Volume 19 March 1993

BATTERY REVERSE INSERTION DETECTOR

by Timothy G. Sheppard and Mario DiPrizio

BACKGROUND

  The use of lithium batteries is a growing practice in todays industry. They provide a high capacity per amount of space used. The problem with lithium batteries is that they react poorly to charging. The reaction can range from an explosion to a discharge of the batteries inter- nal chemicals.

  Charging of a battery can occur in situations when one battery in a series of batteries is reversed. Incorrect battery insertion is a common occurrence. Current designs use mechanical means to protect against reverse insertion of batteries. Manufacturers will provide multi- ple batteries in a single package so that they can not be reversed. This has some drawbacks. One draw back is that the package may exceed the space limit that is allot- ted. Another draw back is that the packages are not read- ily available by the customer (custom type part).

SOLUTION

  The best solution would provide a means to protect the battery from being charged, and it would warn the user of incorrect battery insertion. The solution to the problem is obtained by applying two simple circuit ele- ments to the problem: leds, and resistors (refer to Fig- ure 1). The led is the warning device and the resistor is used to limit current flowing through the led. The fol- lowing is a sample scenario of how the circuit works (refer to Figure 1):

1) Battery 2 is reversed....