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:
Jun. 01, 2010
Filed:
Jun. 04, 2009
Yusai Murakami, Hamamatsu, JP;
Norito Yamabe, Toyohashi, JP;
Yusai Murakami, Hamamatsu, JP;
Norito Yamabe, Toyohashi, JP;
Panasonic EV Energy Co., Ltd., Kosai-Shi, JP;
Abstract
An apparatus estimates charge/discharge electricity amount without being affected by current measurement error. Under specific selection conditions, a no-load voltage calculation part uses pairs of data consisting of current data I(n) and voltage data V(n) corresponding to the current data to calculate a no-load voltage Vas the voltage intercept at a current of zero in a straight-line approximation obtained by statistical processing such as regression analysis using a least squares method. If specific current conditions exist for a certain amount of time, an open circuit voltage calculation part calculates the terminal voltage of the secondary battery as the open circuit voltage V. An estimated charge/discharge electricity amount calculation part uses a preset change-in-voltage adjustment constant ΔV/adjustment coefficient K, change-in-electromotive-force constant Kand polarization voltage generation constant Kto calculate the estimated charge/discharge electricity amount ΔQas a function of the change ΔVin the no-load or open circuit voltage over a predetermined period of time.