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TWO CHARGE CONTACT BAITERY WITH INTERNAL CODE RESISTOR AND THERMISTOR

IP.com Disclosure Number: IPCOM000008461D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-17
Document File: 2 page(s) / 79K

Publishing Venue

Motorola

Related People

Robert B. Ford: AUTHOR

Abstract

Products requiring rapid rechargeable batteries is approximately 15e each, this design results in can benefit from this design that provides present cost savings in both the battery and the charger of level performance at lower cost and higher reliability. approximately 30$ and log per unit respectively. This battery and charger design provides standard rapid charging performance but uses only two (2) Furthermore, this design having a minimum charging contacts. number of contacts is desirable for reasons of man- ufacturing ease, cost, housing integrity, reliability of Since the average battery or charge contact cost connection to the charger, etc.

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MOTOROLA Technical Developments

TWO CHARGE CONTACT BAITERY WITH INTERNAL CODE RESISTOR AND THERMISTOR

by Robert 0. Ford

  Products requiring rapid rechargeable batteries is approximately 15e each, this design results in can benefit from this design that provides present cost savings in both the battery and the charger of level performance at lower cost and higher reliability. approximately 30$ and log per unit respectively. This battery and charger design provides standard
rapid charging performance but uses only two (2) Furthermore, this design having a minimum charging contacts. number of contacts is desirable for reasons of man- ufacturing ease, cost, housing integrity, reliability of Since the average battery or charge contact cost connection to the charger, etc.

+5vdc

-/-

Charger ; Battery

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- 6

P Iv=? T (cont'd)-A j

', B+

CR1 c

7

a Y B-

  General operation is as follows. When the bat- tery is inserted into the charger, the charger sequences in a manner that allows measurement of the type battery (code resistor, Rc) and the cell tem- perature (thermistor, Rt). After making these mea- surements, the charger enters the standard rapid charging regimen. Repeated measurement of the battery internal temperature during rapid charging is done using a sequence described below to permit the optimum termination of rapid charging.

  Upon insertion of the battery into the charger, the charger applies precharging current (approx 200mAdc) to the charging contact [+] of the batte...