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:
Jan. 30, 2018
Filed:
Mar. 13, 2014
Primearth Ev Energy Co., Ltd., Kosai-shi, Shizuoka, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Daisuke Koba, Toyohashi, JP;
Sachio Takeda, Toyohashi, JP;
Koichi Ichikawa, Kasugai, JP;
Yasuhiro Takahashi, Miyoshi, JP;
Masahiko Mitsui, Toyota, JP;
PRIMEARTH EV ENERGY CO., LTD., Toyota-Shi, JP;
Abstract
This battery state determination device () is provided with: a voltage detection unit () that detects the voltage (V) of a rechargeable battery (M) to be evaluated; a current detection unit () that detects the current of the rechargeable battery (M); a charge state detection unit () that detects the state of charge (SOC) of the rechargeable battery (M); and a determination unit () configured so as to calculate the absolute value of the voltage gradient (G), which indicates the change in voltage with respect to the discharge amount (Ah), when the state of charge (SOC) of the rechargeable battery (M) is less than 40%, compare the absolute value of the voltage gradient (G) to a pre-set upper limit value (Gmax), and, when the absolute value of the voltage gradient (G) is greater than the upper limit value (Gmax), determine that a small short circuit has occurred in the rechargeable battery (M).