Patent Number: 6,311,080

Title: Method for detecting full charge state of battery

Abstract: A method for detecting a full charge state has the steps of obtaining a first data series including first to N-th data items, the first to N-th data items of the first data series corresponding to battery voltages measured at first sampling intervals during a first sampling time period, respectively; and obtaining a second data series including first to N-th data items, the first to N-th data items of the second data series corresponding to battery voltages measured at second sampling intervals during a second sampling time period, respectively. A predetermined time delay is provided between a beginning of the first sampling time period and a beginning of the second sampling time period, and the second sampling intervals are the same as the first sampling intervals. The method has the further steps of comparing an i-th data item of the first data series and an i-th data item of the second data series (i=1, 2, . . . , N) to obtain a number of times that the i-th data item of the second data series is smaller than the i-th data item of the first data series; and judging whether or not the battery has reached the full charge state on the basis of a ratio of the number of times to N.

Inventors: Mochida; Muneaki (Tokyo, JP)

Assignee: Oki Electric Industry Co., Ltd.

International Classification: G01R 31/36 (20060101); H02J 7/00 (20060101); H04B 001/38 (); G01N 027/416 ()

Expiration Date: 10/30/2018