Dynamic regulation of an electric output

• US 10,424,944 B2
• Filed: 03/23/2015
• Issued: 09/24/2019
• Est. Priority Date: 04/17/2014
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Trinkert, Stefan, Mangold, Benjamin
• Primary Examiner(s): Pacheco, Alexis B
• Application Number:
  US15/304,561
• Publication Number:
  US 20170040807A1
• Time in Patent Office: 1,646 Days
• Field of Search: 320134, 320104, 320132, 320118, 320116, 320106, 320109, 320112, 320126, 320107, 320128, 320162
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

The invention relates to a method for automatically regulating an electric output which is dispensed by a secondary battery that has at least two battery cells, wherein

• • the charge states of all the battery cells are repeatedly detected at time intervals,
  • an average charge state (SOC_average) is ascertained per battery cell from the detected charge states of the battery cells,
  • a deviation of at least one charge state of a battery cell from the average charge state (SOC_average) is detected, and
  • the average charge state (SOC_average) and the deviation are taken into consideration during the automatic and dynamic regulation of the electric output dispensed by the secondary battery.

Claims

1. A method for automatically regulating an electric output which is dispensed by a secondary battery that has at least two battery cells, the method comprising:

repeatedly detecting charge states of all the battery cells at time intervals,

ascertaining an average charge state (SOC_average) per battery cell from the detected charge states of the battery cells,

ascertaining a difference between a charge state (SOC_max) of a battery cell of the at least two battery cells having the highest charge and a charge state (SOC_min) of a battery cell of the at least two battery cells having the lowest charge, and

automatically and dynamically regulating the electric output of the secondary battery based on the average charge state (SOC_average) and the difference.

2. The method according to claim 1, wherein the average charge state (SOC_average) is multiplied by a function which depends on the difference, wherein a function value of the function for the difference is ascertained from a predefined relationship between the possible values of the difference and the possible function values.

3. The method according to claim 2, wherein the predefined relationship is defined by at least one characteristic curve.

4. The method according to claim 2, wherein the predefined relationship is defined by means of at least one proportional integral (PI) controller.

5. A system for automatically and dynamically regulating an electric output which is dispensed by a secondary battery that has at least two battery cells, comprising at least one electronic device that is configured to:

repeatedly detect charge states of all the battery cells at time intervals,

ascertain an average charge state (SOC_average) per battery cell from the detected charge states,

ascertain a difference between a charge state (SOC_max) of a battery cell of the at least two battery cells having the highest charge and a charge state (SOC_min) of a battery cell of the at least two battery cells having the lowest charge, and

automatically and dynamically regulate the electric output dispensed by the secondary battery based upon the average charge state (SOC_average) and the difference.

6. The system according to claim 5, wherein the electronic device is configured to multiply the average charge state (SOC_average) by a function which depends on the ascertained difference and to ascertain a function value of the function for the difference from a predefined relationship between the possible values of the difference and the possible function values.

7. The system according to claim 6, wherein the predefined relationship is defined by at least one characteristic curve deposited in the electronic device or in a separate storage device.

8. The system according to claim 6, wherein the electronic device has at least one proportional integral (PI) controller, by means of which the predefined relationship is defined.