The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 1999
Filed:
Jan. 29, 1998
Tetsuya Okada, Sumoto, JP;
Takahiro Yamashita, Sumoto, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
This method to determine remaining capacity of a rechargeable battery calculates remaining battery capacity by subtracting discharge capacity, computed by integrating battery discharge current, from charge capacity. Voltage of the discharging rechargeable battery is measured, and when battery voltage reaches a first voltage and a lower second voltage, the computed remaining battery capacity is corrected according to a previously established first remaining battery capacity and second remaining battery capacity corresponding to those voltages. The difference between calculated remaining battery capacity or discharge capacity at the first and second voltages is compared to the difference between the previously established first and second remaining battery capacity values, and the first voltage is modified to make those two differences equal.