US 11,029,364 B2 · Method and arrangement for determining the state of charge and the state of health of an electrical energy store

Abstract

In order to determine the charging capacity state and the state of health of an electrical energy store of a battery system (BS1; BS2) with little effort, a measuring device (ME) is proposed, which measuring device injects, into a drive train which is available for first or second loads (VR1; VR2) and has an AC/DC converter (ADC) or a DC/DC controller (DDC) on the DC side of the AC/DC converter (ADC) or of the DC/DC controller (DDC), a sinusoidal voltage harmonic with a varied frequency or a sinusoidal current with a varied frequency as a particular measurement signal which is transmitted to the battery system (BS1; BS2). The current response or voltage response, which has been purged of unwanted influences, is then determined for each measurement signal at the battery system (BS1; BS2), from which response phase shifts are determined in each case, and parameters for a statement relating to the charging capacity state or the state of health of the battery system (BS1; BS2) are in turn determined therefrom.

Claims17

Dependent claims

A method for determining a state of charge or a state of health of an electrical energy store of a battery system, which is connected into an electrical drive train, which has consumers supplied with electrical energy via an AC/DC converter or a DC/DC converter or the battery system, the method comprising:

impressing a measurement signal by virtue of a sinusoidal voltage harmonic with varied frequency or a sinusoidal current with varied frequency on a DC side of the AC/DC converter or the DC/DC converter;
transmitting the measurement signal from the AC/DC converter or from the DC/DC converter to the battery system;
ascertaining, by a measurement circuit formed between the AC/DC converter or the DC/DC converter and the battery system, a current response or a voltage response for the measurement signal at the battery system;
adjusting the current response or the voltage response for an effect of capacitances or impedances determined in advance, the capacitances or impedances located outside of the battery system and acting on the measurement circuit;
ascertaining an occurring phase shift from the adjusted current response or the adjusted voltage response;
and
deriving parameters for a statement about the state of charge or about the state of health of the electrical energy store of the battery system from the ascertained phase shifts.

4 more elements

Dependencies are inferred from the claim text.

Method and arrangement for determining the state of charge and the state of health of an electrical energy store

Life of this patent

Method and arrangement for determining the state of charge and the state of health of an electrical energy store

Life of this patent

Abstract

Claims17