1. An electric double layer capacitor comprising:
a cell including
a positive electrode,
a negative electrode facing said positive electrode, and
a porous separator that is impregnated with an electrolytic solution and that is disposed between said positive and negative electrodes, said positive and negative electrodes expanding upon charging of said electric double layer capacitor and contracting upon discharging of said electric double layer capacitor;
a case containing said cell; and
a electrolytic solution reservoir having a porous structure and located in said case in contact with said separator and impregnable with said electrolytic solution so that, upon charging of said electric double layer capacitor, electrolytic solution moves from said electrolytic solution reservoir to said porous separator and, upon discharging of said electric double layer capacitor, electrolytic solution moves from said porous separator into said electrolytic solution reservoir.
2. The electric double layer capacitor according to claim 1, wherein said electrolytic solution reservoir and said separator have respective main surfaces and adhere to each other at the respective main surfaces.
3. The electric double layer capacitor according to claim 1, further comprising a release valve in said case, wherein said electrolytic solution reservoir extends between said release valve and said cell.
4. The electric double layer capacitor according to claim 1, wherein said electrolytic solution reservoir includes pores having an average diameter and said separator includes pores having an average diameter and the average diameter of the pores of said electrolytic solution reservoir is larger than the average diameter of the pores of said separator.
5. The electric double layer capacitor according to claim 4, wherein said electrolytic solution reservoir is impregnated with a predetermined amount of said electrolytic solution so that an occupation ratio of said electrolytic solution within the pores of said separator becomes at least 50% when said electric double layer capacitor is fully charged, and the occupation ratio of said electrolytic solution within the pores of said electrolytic solution reservoir does not exceed 100% when said electric double layer capacitor is fully discharged.
6. The electric double layer capacitor according to claim 1, wherein said electrolytic solution reservoir contracts when at least one of said positive electrode and said negative electrode expands, and expands when at least one of said positive electrode and said negative electrode contracts.
7. The electric double layer capacitor according to claim 6, wherein said electrolytic solution reservoir is located between an inner surface of said case and said cell.
8. The electric double layer capacitor according to claim 6, wherein said electrolytic solution reservoir is one of a porous fluorine-based rubber and a porous silicone-based rubber.
9. The electric double layer capacitor according to claim 6, wherein said electrolytic solution reservoir is a gel electrolyte.
10. The electric double layer capacitor according to claim 6, wherein said electrolytic solution reservoir comprises a metal cushion plate and a porous body of carbon fibers.
11. The electric double layer capacitor according to claim 6, wherein said electrolytic solution reservoir is a foamed plastic having both closed pores and open pores.
12. The electric double layer capacitor according to claim 6, wherein said electrolytic solution reservoir includes pores having an average diameter and said separator includes pores having an average diameter and the average diameter of the pores of said electrolytic solution reservoir is larger than the average diameter of the pores of said separator.
13. The electric double layer capacitor according to claim 12, wherein said electrolytic solution reservoir is impregnated with a predetermined amount of said electrolytic solution so that an occupation ratio of said electrolytic solution within the pores of said separator becomes at least 50% when said electric double layer capacitor is fully charged, and the occupation ratio of said electrolytic solution within the pores of said electrolytic solution reservoir does not exceed 100% when said electric double layer capacitor is fully discharged.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of managing a user database in a mobile terminal, the method comprising the steps of:
when communication using a telephone number registered in a phone book occurs, updating a communication time of the telephone number to the time when the communication is terminated;
searching for the communication time by a display request of phone book information including the telephone number;
calculating a time interval from a present time to the communication time and searching for a connection period to which the calculated time interval belongs among a plurality of connection periods having different predetermined time intervals; and
displaying a communication time mark corresponding to the searched connection period among a plurality of communication time marks corresponding to the plurality of connection periods with the requested phone book information.
2. The method of claim 1, wherein the number of the plurality of connection periods and a time interval of each connection period is set by a user
3. The method of claim 1, wherein the plurality of communication time marks are formed with a figure having different colors.
4. The method of claim 1, wherein the plurality of communication time marks are one of animal characters, plant characters, and constellation characters such as the signs of the zodiac corresponding to birth years or months, each having different countenances and shapes.
5. The method of claim 1, further comprising the step of:
if communication using the telephone number occurs again, updating communication time information of the telephone number to the time when the communication is terminated.
6. A method of managing a user database in a mobile terminal, the method comprising the steps of:
when communication using a telephone number registered in a phone book occurs, updating a communication time of the telephone number to the time when the communication is terminated by identifying a type of communication service;
searching for communication time information related to the telephone number by a display request of phone book information including the telephone number and detecting a communication termination time;
calculating a time interval from a present time to the communication termination time and searching for a connection period to which the calculated time interval belongs among a plurality of connection periods having different predetermined time intervals; and
displaying a communication time mark corresponding to the searched connection period among a plurality of communication time marks corresponding to the plurality of connection periods and a type of communication service related to the communication termination time with the requested phone book information.
7. The method of claims 6, wherein if the type of communication service is a message service, the communication time information is updated by changing the communication termination time to a message outgoing time.
8. The method of claim 6, wherein if a list of a plurality of users is included in the phone book information, when the phone book information is displayed, a communication time mark of a telephone number with which a most recent communication has been performed among one or more telephone numbers related to each user is displayed with the user list.
9. An apparatus for managing a user database in a mobile terminal, the apparatus comprising:
a phone book;
a memory module for storing communication time information corresponding to telephone numbers registered in the phone book, a plurality of connection periods having different time intervals, and a plurality of communication time marks corresponding to the plurality of connection periods by identifying types of communication services; and
a controller module for, when communication using an arbitrary telephone number registered in a phone book occurs, updating a communication time of the telephone number to the time when the communication is terminated; searching for the communication time by a display request of phone book information including the telephone number, calculating a time interval from a present time to the communication time and searching for a connection period to which the calculated time interval belongs, and displaying a communication time mark corresponding to the searched connection period with the requested phone book information.