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:
Apr. 02, 2019
Filed:
Mar. 24, 2017
Bayerische Motoren Werke Aktiengesellschaft, Munich, DE;
Moritz Schindler, Munich, DE;
Markus Mauerer, Munich, DE;
Bayerische Motoren Werke Aktiengesellschaft, Munich, DE;
Abstract
An energy storage apparatus for an onboard electrical system of a motor vehicle has a first electrical energy store characterized by a first voltage characteristic curve defining the quiescent voltage of the first store depending on the relative state of charge of the first store, and a second electrical energy store which can be connected in parallel with the first electrical energy store by a controllable switching element and which is characterized by a second voltage characteristic curve defining the quiescent voltage of the second electrical energy store depending on the relative state of charge of the second store. A first voltage value range covered by the first voltage characteristic curve and a second voltage value range which is covered by the second voltage characteristic curve partially overlap. The energy storage apparatus further has a device for determining the state of charge of the first energy store and/or of the second energy store. The device establishes the state of charge either by a quiescent voltage measurement device or by a state of charge determination device by balancing a respective battery current. The device opens the controllable switching element when the motor vehicle is in a state similar to the quiescent state and a quality value determined during a previous state of charge determination process in parallel with the state of charge and expressing the quality of the balancing exceeds a predefined threshold value. When the two criteria are fulfilled, the quiescent voltage measurement device for determining the state of charge of at least the first energy store is activated.