Method for Ascertaining Operating Parameters of a Battery, Battery Management System, and Battery

• US 20140302355A1
• Filed: 10/14/2011
• Published: 10/09/2014
• Est. Priority Date: 12/10/2010
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Original Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Inventors: Brochhaus, Christoph, Boehm, Andre
• Granted Patent: US 9,476,947 B2
• Time in Patent Office: Days
• US Class Current: 429/50
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• 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 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

The disclosure relates to a method for ascertaining permissible operating parameters of a battery. For this purpose, operating parameters of the battery are measured, and further relevant operating parameters of the battery are determined from the measured operating parameters. Furthermore, at least one of the determined operating parameters is compared with a predefined comparison range. If the at least one operating parameter lies within the predefined comparison range, the permissible operating range of the at least one operating parameter is determined using a mathematical model of the battery. However, if the at least one battery parameter lies outside the predefined comparison range, the permissible operating range of the at least one operating parameter is determined using previously stored battery data.

Claims

1. A method for ascertaining operating parameters of a battery, comprising:

measuring a plurality of measured operating parameters of the battery;

determining a plurality of determined operating parameters of the battery from the plurality of measured operating parameters;

comparing at least one determined operating parameter of the plurality of determined operating parameters with a predefined comparison interval; and

determining one of (i) a permissible operating range of the at least one determined operating parameter based on a mathematical battery model insofar as the at least one determined operating parameter lies within the predefined comparison interval, and (ii) determining the permissible operating range of the at least one determined operating parameter based on stored battery data insofar as the at least one determined operating parameter is outside the predefined comparison interval.

2. The method as claimed in claim 1, wherein the determination of the permissible operating range of the at least one determined operating parameter is repeated within a predefined time interval.

3. The method as claimed in claim 1, wherein the mathematical battery model is a linear mathematical battery model.

4. The method as claimed in claim 1, further comprising:

comparing the permissible operating range of the at least one determined operating parameter with an operations request profile; and

operating the battery according to one of (i) the operations request profile insofar as the at least one determined operating parameter of the operations request profile lies within the permissible operating range, and (ii) a limiting value of the permissible operating range insofar as the at least one determined operating parameter of the operations request profile lies outside the permissible operating range.

5. The method as claimed in claim 1, wherein the predefined comparison interval is determined on the basis of the plurality of measured operating parameters.

6. The method as claimed in claim 1, further comprising:

reconciling between the stored battery data and the mathematical battery model.

7. The method as claimed in claim 1, wherein the plurality of determined operating parameters includes at least one of a state of charge, a state of health, a state of function, an upper voltage limit, a lower voltage limit, an upper temperature limit, a lower temperature limit, an upper current limit, a lower current limit, a charging power, a discharging power, an available energy, and an energy configured to be extracted from the battery.

8. A battery management system comprising:

a measuring device configured to measure a plurality of measured operating parameters of the battery;

a determining device configured to determine a plurality of determined operating parameters of the battery from the plurality of measured operating parameters; and

a memory configured to store empirically determined battery data of the battery over an operating range,

wherein the battery management system is configured to compare at least one determined operating parameter of the plurality of determined operating parameters with a predefined comparison interval, and

wherein the operating range of the at least one determined operating parameter is determined based on one of (i) a mathematical battery model insofar as the at least one determined operating parameter lies within the predefined comparison interval, and (ii) stored battery data insofar as the at least one determined operating parameter lies outside the predefined comparison interval.

9. A lithium-ion battery, comprising:

a battery management system including (i) a measuring device configured to measure a plurality of measured operating parameters of the battery, (ii) a determining device configured to determine a plurality of determined operating parameters of the battery from the plurality of measured operating parameters, and (iii) a memory configured to store empirically determined battery data of the battery over an operating range,

wherein the battery management system is configured to compare at least one determined operating parameter of the plurality of determined operating parameters with a predefined comparison interval, and

wherein the operating range of the at least one determined operating parameter is determined based on one of (i) a mathematical battery model insofar as the at least one determined operating parameter lies within the predefined comparison interval, and (ii) stored battery data insofar as the at least one determined operating parameter lies outside the predefined comparison interval.

10. The lithium-ion battery as claimed in claim 9, wherein the lithium-ion battery is connected to a drive system of a motor vehicle.