# US 11,029,364 B2 · Method and arrangement for determining the state of charge and the state of health of an electrical energy store > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,029,364 B2 - Document ID: US11029364B2 - Status: Granted - Kind: B2 - Application number: 16/481,747 - Filed: 2017-12-18 - Published: 2019-12-26 - Granted: 2021-06-08 - Earliest claimed: 2017-01-31 - Assignees: Rolls-Royce Deutschland Ltd & Co KG - Applicants: Rolls-Royce Deutschland Ltd & Co KG - Inventors: Andreas Meyer - Web page: https://patentgrep.com/patent/US11029364B2 ## CPC - G01R 31/389: Measuring internal impedance, internal conductance or related variables - G01R 31/392: Determining battery ageing or deterioration, e.g. state of health - G01R 31/3842: combining voltage and current measurements - G06F 30/20: Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) - G01R 31/382: Arrangements for monitoring battery or accumulator variables, e.g. SoC - G01R 31/3835: involving only voltage measurements - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The method of claim 1, further comprising: adjusting a battery model forming a basis for the energy store of the battery system using the derived parameters. ### Claim 3 (depends on 1) The method of claim 1, wherein the deriving of the parameters comprises deriving parameters for a statement about the state of charge of the electrical energy store of the battery system. ### Claim 4 (depends on 1) The method of claim 1, wherein the deriving of the parameters comprises deriving parameters for a statement about the state of health of the electrical energy store of the battery system. ### Claim 5 (depends on 1) The method of claim 1, wherein the measurement signal is impressed by virtue of the sinusoidal voltage harmonic with varied frequency. ### Claim 6 (depends on 1) The method of claim 1, wherein the measurement signal is impressed by virtue of the sinusoidal current with varied frequency. ### Claim 7 (depends on 1) The method of claim 1, wherein the current response is ascertained for the measurement signal at the battery system, wherein the current response is adjusted for the effect of the capacitances or the impedances determined in advance, and wherein the occurring phase shift is ascertained from the adjusted current response. ### Claim 8 (depends on 1) The method of claim 1, wherein the voltage response is ascertained for the measurement signal at the battery system, wherein the voltage response is adjusted for the effect of the capacitances or the impedances determined in advance, and wherein the occurring phase shift is ascertained from the adjusted voltage response. ### Claim 9 (depends on 1) The method of claim 1, wherein the measurement signal is impressed on the DC side of the AC/DC converter, and wherein the measurement signal is transmitted from the AC/DC converter to the battery system. ### Claim 10 (depends on 1) The method of claim 1, wherein the measurement signal is impressed on the DC side of the DC/DC converter, and wherein the measurement signal is transmitted from the DC/DC converter to the battery system. ### Claim 11 An arrangement for determining a state of charge or a state of health of an electrical energy store of a battery system connected to an electrical drive train, the arrangement comprising: an AC/DC converter or a DC/DC converter, downstream of which the battery system is connected; and a measurement device connected so as to form a measurement circuit, the measurement device connected on one side to a DC side of the AC/DC converter or the DC/DC converter so as to impress a sinusoidal voltage harmonic with varied frequency or a sinusoidal current with varied frequency as a respective measurement signal transmitted to the battery system, and on the other side to the battery system so as to ascertain a current response or a voltage response for each transmitted measurement signal, wherein the measurement device is configured to: determine in advance capacitances or impedances located outside of the battery system and acting on the measurement circuit; adjust each current response or each voltage response for the effect of the capacitances or impedances determined in advance; ascertain an occurring phase shift from each adjusted current response or each adjusted voltage response; and derive parameters for a statement about the state of charge or about the state of health of the battery system from the phase shifts. ### Claim 12 (depends on 11) The arrangement of claim 11, wherein the arrangement comprises the AC/DC converter, and wherein the measurement device is connected on the one side to the DC side of the AC/DC converter. ### Claim 13 (depends on 11) The arrangement of claim 11, wherein the arrangement comprises the DC/DC converter, and wherein the measurement device is connected on the one side to the DC/DC converter. ### Claim 14 (depends on 11) The arrangement of claim 11, wherein the measurement device is configured to impress the sinusoidal voltage harmonic with varied frequency as the respective measurement signal transmitted to the battery system. ### Claim 15 (depends on 11) The arrangement of claim 11, wherein the measurement device is configured to impress the sinusoidal current with varied frequency as the respective measurement signal transmitted to the battery system. ### Claim 16 (depends on 11) The arrangement of claim 11, wherein the current response is ascertained for each transmitted measurement signal. ### Claim 17 (depends on 11) The arrangement of claim 11, wherein the voltage response is ascertained for each transmitted measurement signal.