Battery pack

Abstract

A battery pack is provided which can be suitably used in a case where charging of a dedicated secondary battery in a portable terminal device is difficult. The battery pack is mounted in a battery mounting section in a portable cellular phone (portable terminal device) proper. In the battery pack, alkaline accumulators are connected in series. Alkaline accumulators generate electromotive forces having a voltage (3V) being lower than that of the dedicated secondary battery. A power source circuit has a boosting-type DC/DC converter which boosts a voltage of the alkaline accumulators being connected in series at a level being same as that of the dedicated secondary battery (for example, 4.5V), and outputs the boosted voltage. An electrical double layer capacitor has a capacity to feed stable power to an internal circuit in which power consumption increases or decreases in a burst manner and is charged by application of an output of the power source circuit and stores the power.

1 .- 14 . (canceled) 
     
     
         15 . A battery pack being placed in a portable terminal device in a manner so as to be replaceable with a dedicated secondary battery for being used as a power source of said portable terminal device comprising:
 a fuel cell to generate a specified electromotive force; and   a package to house said fuel cell.   
     
     
         16 . The battery pack according to  claim 15 , wherein said package, instead of said dedicated secondary battery, is configured to be placed in said portable terminal device and is provided with terminals to feed said specified electromotive force of said fuel cell to said portable terminal device. 
     
     
         17 . The battery pack according to  claim 15 , further comprising:
 a power storing unit to be charged by application of a voltage output from said fuel cell, hereby storing fed power, and to feed the stored power to said portable terminal device,   wherein said a package houses said fuel cell and said power storing unit.   
     
     
         18 . The battery pack according to  claim 17 , wherein said power storing unit is made up of an electrical double layer capacitor. 
     
     
         19 . The battery pack according to  claim 17 , further comprising;
 a current limiting circuit to limit a current of input said specified electromotive force of said fuel cell to a level being a predetermined value or less, wherein said a package houses said fuel cell, said power storing unit and said current limiting circuit.   
     
     
         20 . The battery pack according to  claim 17 , further comprising;
 a voltage boosting unit to boost a voltage level of said specified electromotive force fed from said fuel cell to a voltage level of said dedicated secondary battery; and, wherein said power storing unit is charged by application of a voltage output from said voltage boosting unit, hereby storing fed power, and feed the stored power to said portable terminal device, and wherein said a package houses said fuel cell, said power storing unit and said voltage boosting unit.   
     
     
         21 . The battery pack according to  claim 20 , wherein said voltage boosting unit comprises a Direct Current/Direct Current (DC/DC) converter. 
     
     
         22 . The battery pack according to  claim 19 , wherein said electrical double layer capacitor has an equivalent serial resistance being lower than that of said fuel cell. 
     
     
         23 . The battery pack according to  claim 18 , wherein said electrical double layer capacitor has a capacity being able to feed stable power to said portable terminal device in which power consumption increases or decreases in a burst manner. 
     
     
         24 . The battery pack according to  claim 15 , wherein said portable terminal device has a function of a Time Division Multiple Access (TDMA)-type portable cellular phone. 
     
     
         25 . A battery pack being placed in a portable terminal device in a manner so as to be replaceable with a dedicated secondary battery for being used as a power source of said portable terminal device comprising:
 a fuel cell to generate electromotive force;   a current limiting circuit to limit a current of input electromotive force of said fuel cell to a level being a predetermined value or less; and   a voltage boosting unit to boost a voltage of said electromotive force of said fuel cell fed from said current limiting circuit to a voltage level of said dedicated secondary battery and to feed boosted voltage to said portable terminal device.   
     
     
         26 . A battery pack being placed in a portable terminal device in a manner so as to be replaceable with a dedicated secondary battery for being used as a power source of said portable terminal device comprising:
 a fuel cell to generate electromotive force;   a current limiting circuit to limit a current of input electromotive force of said fuel cell to a level being a predetermined value or less;   a Direct Current/Direct Current (DC/DC) converter to boost a voltage of said electromotive force of said fuel cell fed from said current limiting circuit to a voltage level of said dedicated secondary battery and to feed boosted voltage to said portable terminal device;   a package to house said fuel cell, said current limiting unit, and said DC/DC converter; and   wherein said package, instead of said dedicated secondary battery, is configured to be placed in said portable terminal device and is provided with terminals to feed power output from said DC/DC converter to said portable terminal device.   
     
     
         27 . A battery pack being placed in a portable terminal device in a manner so as to be replaceable with a dedicated secondary battery for being used as a power source of said portable terminal device comprising:
 a fuel cell to generate electromotive force;   a current limiting circuit to limit a current of input electromotive force of said fuel cell to a level being a predetermined value or less;   a voltage boosting unit to boost a voltage of said electromotive force of said fuel cell fed from said current limiting circuit to a voltage level of said dedicated secondary battery; and   a power storing unit to be charged by application of a voltage output from said voltage boosting unit, hereby storing fed power, and to feed the stored power to said portable terminal device.   
     
     
         28 . A battery pack being placed in a portable terminal device in a manner so as to be replaceable with a dedicated secondary battery for being used as a power source of said portable terminal device comprising:
 a fuel cell to generate electromotive force;   a current limiting circuit to limit a current of input electromotive force of said fuel cell to a level being a predetermined value or less;   a Direct Current/Direct Current (DC/DC) converter to boost said voltage of said electromotive force of said fuel cell fed from said current limiting circuit to a voltage level of said dedicated secondary battery;   a power storing unit to be charged by application of a voltage output from said DC/DC converter and to store fed power and to feed the stored power to said portable terminal device;   a package to house said fuel cell, said current limiting circuit, said DC/DC converter, and said power storing unit; and   wherein said package, instead of said dedicated secondary battery, is configured to be placed in said portable terminal device and is provided with terminals to feed said power being accumulated in said power storing unit to said portable terminal device.