METHOD FOR MONITORING A STATE OF A RECHARGEABLE BATTERY BASED ON A STATE VALUE WHICH CHARACTERIZES THE RESPECTIVE STATE OF THE RECHARGEABLE BATTERY

• US 20140347058A1
• Filed: 05/22/2014
• Published: 11/27/2014
• Est. Priority Date: 05/22/2013
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Walter, Andreas, Weiss, Patrick, Waibler, Markus
• Granted Patent: US 9,772,382 B2
• Time in Patent Office: Days
• US Class Current: 324/426
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/16 responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A method for monitoring a state of a rechargeable battery based on a state value which characterizes the respective state of the rechargeable battery, characterized in that, during at least one time interval, an electrical energy which is output by the rechargeable battery and an electrical energy which is received by the rechargeable battery are detected, and in that an instantaneous state of charge or an instantaneous no-load voltage of the rechargeable battery is detected, wherein the detected electrical energy which is output by the rechargeable battery, the detected electrical energy which is received by the rechargeable battery and the respectively detected instantaneous state of charge or the respectively detected instantaneous no-load voltage of the rechargeable battery are evaluated in order to generate the state value.

Claims

1. A method for monitoring a state of a rechargeable battery based on a state value which characterizes a respective state of the rechargeable battery, comprising detecting, during at least one time interval, an electrical energy which is output by the rechargeable battery and an electrical energy which is received by the rechargeable battery, and detecting an instantaneous state of charge or an instantaneous no-load voltage of the rechargeable battery, wherein the detected electrical energy which is output by the rechargeable battery, the detected electrical energy which is received by the rechargeable battery and the respectively detected instantaneous state of charge or the respectively detected instantaneous no-load voltage of the rechargeable battery are evaluated in order to generate the state value.

2. The method according to claim 1, characterized in that an end of the time interval is defined by the time at which a magnitude of the received electrical energy corresponds to a magnitude of the output electrical energy, wherein, after the end of the time interval, a difference between the detected instantaneous state of charge or the detected instantaneous no-load voltage of the rechargeable battery at a beginning of the time interval and the detected instantaneous state of charge or the detected instantaneous no-load voltage of the rechargeable battery at the end of the time interval is divided by a sum of the magnitudes of the detected electrical energy which is received by the rechargeable battery and the detected electrical energy which is output by the rechargeable battery.

3. The method according to claim 1, characterized in that an end of the time interval is defined by the time at which the instantaneous state of charge which is detected after a beginning of the time interval or the instantaneous no-load voltage of the rechargeable battery which is detected after the beginning of the time interval corresponds to the detected instantaneous state of charge or the detected instantaneous no-load voltage of the rechargeable battery at the beginning of the time interval, wherein, after the end of the time interval, a difference between the magnitudes of the detected electrical energy which is received by the rechargeable battery and the detected electrical energy which is output by the rechargeable battery is divided by a sum of the magnitudes of the detected electrical energy which is received by the rechargeable battery and the detected electrical energy which is output by the rechargeable battery.

4. The method according to claim 1, characterized in that the respectively detected instantaneous state of charge or the respectively detected instantaneous no-load voltage is compared with a predefinable state of charge value or no-load voltage value, wherein a beginning of the time interval is defined by a time at which the detected instantaneous state of charge or the detected instantaneous no-load voltage of the rechargeable battery exceeds or falls below the predefinable state of charge value or no-load voltage value.

5. The method according to claim 1, characterized in that a beginning of each time interval is defined by a predefinable start time, wherein a time difference between immediately successive start times is the same.

6. The method according to claim 1, characterized in that the electrical energy which is output by the rechargeable battery, the electrical energy which is received by the rechargeable battery and the instantaneous state of charge or the instantaneous no-load voltage of the rechargeable battery are detected in at least two time intervals which partly overlap in respect of time, wherein each time interval is followed by an evaluation of the detected electrical energy which is output by the rechargeable battery, the detected electrical energy which is received by the rechargeable battery and the respectively detected instantaneous state of charge or the respectively detected instantaneous no-load voltage of the rechargeable battery.

7. A rechargeable battery system comprising at least one rechargeable battery and an electronic device for monitoring a state of the rechargeable battery, wherein the electronic device is designed to detect an electrical energy which is output by the rechargeable battery, an electrical energy which is received by the rechargeable battery and an instantaneous state of charge of the rechargeable battery, characterized in that the electronic device is configured to carry out the method according to claim 1.

8. The method according to one claim 2, characterized in that the respectively detected instantaneous state of charge or the respectively detected instantaneous no-load voltage is compared with a predefinable state of charge value or no-load voltage value, wherein a beginning of the time interval is defined by a time at which the detected instantaneous state of charge or the detected instantaneous no-load voltage of the rechargeable battery exceeds or falls below the predefinable state of charge value or no-load voltage value.

9. The method according to claim 8, characterized in that a beginning of each time interval is defined by a predefinable start time, wherein a time difference between immediately successive start times is the same.

10. The method according to claim 9, characterized in that the electrical energy which is output by the rechargeable battery, the electrical energy which is received by the rechargeable battery and the instantaneous state of charge or the instantaneous no-load voltage of the rechargeable battery are detected in at least two time intervals which partly overlap in respect of time, wherein each time interval is followed by an evaluation of the detected electrical energy which is output by the rechargeable battery, the detected electrical energy which is received by the rechargeable battery and the respectively detected instantaneous state of charge or the respectively detected instantaneous no-load voltage of the rechargeable battery.

11. The method according to one claim 3, characterized in that the respectively detected instantaneous state of charge or the respectively detected instantaneous no-load voltage is compared with a predefinable state of charge value or no-load voltage value, wherein a beginning of the time interval is defined by a time at which the detected instantaneous state of charge or the detected instantaneous no-load voltage of the rechargeable battery exceeds or falls below the predefinable state of charge value or no-load voltage value.

12. The method according to claim 11, characterized in that a beginning of each time interval is defined by a predefinable start time, wherein a time difference between immediately successive start times is the same.

13. The method according to claim 12, characterized in that the electrical energy which is output by the rechargeable battery, the electrical energy which is received by the rechargeable battery and the instantaneous state of charge or the instantaneous no-load voltage of the rechargeable battery are detected in at least two time intervals which partly overlap in respect of time, wherein each time interval is followed by an evaluation of the detected electrical energy which is output by the rechargeable battery, the detected electrical energy which is received by the rechargeable battery and the respectively detected instantaneous state of charge or the respectively detected instantaneous no-load voltage of the rechargeable battery.