BATTERY TESTING DEVICE AND BATTERY TESTING METHOD

• US 20090160403A1
• Filed: 12/16/2008
• Published: 06/25/2009
• Est. Priority Date: 12/19/2007
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Kanai, Takayuki, Uemura, Haruo, TAKENO, Kazuhiko
• Granted Patent: US 8,228,039 B2
• Time in Patent Office: Days
• US Class Current: 320/134
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/386 using test-loads
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health

Abstract

The present invention applies load to a portable telephone by charging and discharging a secondary battery conforming to the actual way of use of the portable telephone, so that the performance of the secondary battery in a portable telephone connected for charging can be accurately tested. A battery testing device of the present invention has: a charge control circuit for controlling input power which is input to a lithium ion battery via an AC adapter; and a radio circuit for controlling output power which is output from the lithium ion battery and discharging the lithium ion battery, wherein when the lithium ion battery reaches a fully charged state, the radio circuit starts discharging while the charge control circuit stops charge of the lithium ion battery using the AC adapter, and when the lithium ion battery reaches a predetermined charged state, the charge control circuit starts charge of the lithium ion battery using the AC adapter while the radio circuit stops discharge of the lithium ion battery.

Claims

1. A battery testing device which can charge a chargeable secondary battery by using charging module for charging said secondary battery, the device comprising:

input control module for controlling input power which said charging module inputs to said secondary battery; and

output control module for controlling output power which is output from said secondary battery, and discharging said secondary battery, wherein

when said secondary battery reaches a fully charged state, said output control module starts discharging said secondary battery while said input control module stops charging said secondary battery using said charging module, and

when said secondary battery reaches a predetermined charged state, said input control module starts charging said secondary battery using said charging module while said output control module stops discharging said secondary battery.

2. The battery testing device according to claim 1, wherein said output control module discharges said secondary battery until reaching a state of 95% of battery capacity in fully charged state when said secondary battery reaches the fully charged state.

3. The battery testing device according to claim 1, further comprising temperature adjustment module for adjusting temperature of said secondary battery, wherein

said input control module controls input power which is input to said secondary battery at a temperature adjusted by said temperature adjustment module, using said charging module, and

said output control module discharges said secondary battery by controlling output power which is output from said secondary battery at a temperature adjusted by said temperature adjustment module.

4. The battery testing device according to claim 3, wherein

said temperature adjustment module makes an adjustment to hold the temperature of said secondary battery at 50°

C.,

said input control module controls input power, which is input in use of said charging module, to said secondary battery at 50°

C. adjusted by said temperature adjustment module, and

said output control module discharges said secondary battery by controlling output power which is output from said secondary battery at 50°

C. adjusted by said temperature adjustment module.

5. The battery testing device according to claim 4, wherein said temperature adjustment module makes an adjustment to hold the temperature of said secondary battery at 150°

C. for three hours when the battery capacity of said secondary battery reaches a predetermined capacity by repeat of discharge of said secondary battery by said output control module and charge of said secondary battery using said charging module by said input control module.

6. The battery testing device according to claim 5, wherein said temperature adjustment module makes an adjustment to hold the temperature of said secondary battery at 150°

C. for three hours when the battery capacity of said second battery reaches 75%, 50% or 25% of a battery capacity of an unused secondary battery of the same type as said secondary battery, by the repeat of discharge and charge of said secondary battery.

7. The battery testing device according to claim 5, wherein said temperature adjustment module judges whether the temperature of said secondary battery rises to 160°

C. or more while performing adjustment to hold the temperature of said secondary battery at 150°

C. for three hours, and displays a result of the judgment on an external device.

8. A battery testing method which can charge a chargeable secondary battery by using charging module for charging said secondary battery, the method comprising:

an input control step of controlling input power which said charging module inputs to said secondary battery; and

an output control step of controlling output power which is output from said secondary battery and discharging said secondary battery, wherein

when said secondary battery reaches a fully charged state, discharge of said secondary battery is started in said output control step while stopping the charge of said secondary battery using said charging module in said input control step, and when said secondary battery reaches a predetermined charged state, charge of said secondary battery using said charging module is started in said input control step while stopping discharge of said secondary battery in said output control step.