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Apparatus and method of monitoring battery temperature during charging
| Details |
Inventors: Wakefield, Ivan Nelson;
Assignee: Ericsson Inc. (Research Triangle Park, NC)
Primary Examiner: Berhane; Adolf
Assistant Examiner: Law; Patrick B.
Attorney, Agent or Firm:
An apparatus and method for charging a battery having a positive terminal, a negative terminal, and a third terminal is disclosed, where a thermistor is positioned across the negative terminal and the third terminal. The apparatus includes a positive contact positioned so as to engage the positive terminal of the battery, a negative contact positioned so as to engage the negative terminal of the battery, a third contact positioned so as to engage the third terminal of the battery, and a logic circuit connected to the positive, negative and third terminals. In addition, a switching device is provided which receives an input from the logic circuit that dictates whether the switching device is positioned closed so as to connect the third contact to a biasing source. The position of the switching device is determined by comparing the voltage at the third contact to a predetermined threshold voltage. |
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DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawing in detail, wherein identical numerals indicate the same elements throughout the figures, FIG.
1 depicts a handheld mobile telephone 10 received by a battery charger 12 so that a battery pack 14 (shown in FIGS.
2A and 2B) can be charged while also being available to supply power to handheld mobile telephone in accordance with the present invention.
Handheld mobile telephone 10 includes a main housing 16 which contains signal processing circuitry (not shown) therein for operating it in a designated mode of communication.
It will be understood that battery pack 14 is of compatible shape and size so as to be positioned within a cavity in a rear surface (not shown) of main housing 16.
More specifically, it will be seen from FIG.
3 that battery pack 14 includes a plurality of cells 15 having a positive terminal 18 and a negative terminal 20.
A third terminal 22 is connected to negative terminal 20 via a thermistor 24 in order to provide a voltage indicative of the temperature for battery pack 14, as discussed further herein.
A first set of contacts 26, 28, and 30 are located on a surface 32 of a housing 34 for battery pack 14 (see FIG.
2A) and positioned so as to interface with corresponding contacts 36, 38, and 40 of handheld mobile telephone 10.
A second set of contacts 42, 44, and 46 are located on a surface 48 (preferably located opposite surface 32, as seen in FIG.
2B) of battery pack housing 34 and positioned so as to interface with corresponding contacts 50, 52, and 54 of battery charger 12.
It will be seen that contacts 26 and 42 of battery pack 14 are connected to positive terminal 18, contacts 28 and 44 are connected to negative terminal 20, and contacts 30 and 46 are connected to third terminal 22.
Accordingly, contacts 36 and 38 of handheld mobile telephone 10 are connected to positive contact 26 and negative contact 28, respectively, while contact 40 is connected to third contact 30 when battery pack 14 is properly positioned within main housing 16 of handheld mobile telephone 10
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Electrical and Wave 
