Battery management method and apparatus

• US 10,468,892 B2
• Filed: 09/28/2016
• Issued: 11/05/2019
• Est. Priority Date: 11/02/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Jeonghyun
• Primary Examiner(s): Dinh, Paul
• Application Number:
  US15/278,547
• Publication Number:
  US 20170126027A1
• Time in Patent Office: 1,133 Days
• Field of Search: 320109, 320134
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/371 with remote indication, e.g. on external chargers
• 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: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• 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 7/0029 with safety or protection devices or circuits
• CPC Class Codes: H02J 7/005 Detection of state of health [SOH]
• 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

Provided is a battery management method and apparatus. The battery management method includes acquiring physical quantity data, for each of a plurality of batteries, of when corresponding physical quantities of the plurality of batteries, making up the physical quantity data, dynamically vary, calculating unbalance data based on physical quantity difference information derived from the physical quantity data, calculating feature data for the physical quantity data by projecting the unbalance data to a feature space, and determining a battery safety for one or more of the plurality of batteries based on determined distribution information of the feature data.

Claims

1. A battery management method comprising:

acquiring physical quantity data indicating a sensed physical quantity for each of a plurality of batteries;

determining, based on the sensed physical quantities, any one of an average, a minimum, and a maximum value of the sensed physical quantities;

determining a physical quantity difference information by determining a difference between each of the sensed physical quantities and the any one of the determined average, the determined minimum, and the determined maximum value of the sensed physical quantities;

calculating unbalance data based on the physical quantity difference information;

obtaining corresponding data of the unbalance data by performing a dimensionality reduction of the unbalance data to project the unbalance data to a predetermined space;

determining distribution information indicating a distribution of the corresponding data in the predetermined space; and

determining a battery safety for one or more of the plurality of batteries based on the distribution information of the corresponding data.

2. The battery management method of claim 1, wherein the determining of the battery safety includes selectively indicating the battery safety to a user based on the determined distribution information.

3. The battery management method of claim 1, wherein the method is performed by an electronic device apparatus, the method further comprising:

comparing the determined battery safety to one or more thresholds; and

performing, based on a result of the comparing, one or more of alerting a user of the electronic device apparatus that a battery is in an abnormality state and rebalancing the plurality batteries.

4. The battery management method of claim 3, wherein the predetermined space is based on a predetermined feature extraction model of balance data representing physical quantity difference information of physical quantity data of a battery being used when corresponding physical quantities dynamically vary without abnormality, and the distribution information of the corresponding data is determined based on a predetermined distribution modeling of the balance data for battery risk or battery safety over time.

5. The battery management method of claim 4, wherein the electronic device apparatus is an electric or hybrid-electric vehicle.

6. The battery management method of claim 1, wherein the determining of the battery safety comprises determining whether a distribution of the corresponding data is within a predetermined area.

7. The battery management method of claim 6, wherein the area is an area set using determined distribution information of normal corresponding data corresponding to balance data that is based on difference information of normal battery data.

8. The battery management method of claim 7, wherein the area is an area of the predetermined space that is set based on a projection of the balance data into a predetermined space that results in the normal corresponding data.

9. The battery management method of claim 6, wherein the determining of the battery safety comprises calculating probability data corresponding to the determined distribution data based on probability distribution information of normal corresponding data.

10. The battery management method of claim 1, wherein the determining of the battery safety comprises calculating a distance between a distribution position of the corresponding data in the predetermined space and a reference point of a area in the predetermined space corresponding to distribution of normal battery data.

11. The battery management method of claim 10, wherein the determining of the battery safety further comprises:

performing a first comparing of the distance to a first threshold and, when a result of the first comparing indicates that the distance meets the first threshold, performing a second comparing of the distance to a second threshold; and

performing cell balancing in response to the distance being determined to fail to meet the second threshold and generating a control signal to control an output of a feedback to a user in response to the distance being determined to meet the second threshold.

12. The battery management method of claim 1, wherein the obtaining of the corresponding data comprises projecting the unbalance data to the predetermined space using a feature extraction model, where the feature extraction model is a model previously defined so as to extract balance data from input data and is based on difference information of normal battery data.

13. The battery management method of claim 12, wherein the determining of the distribution information comprises determining the distribution information using a feature distribution model that has been previously modeled based on distribution information of normal feature data corresponding to a normal feature extracted using the feature extraction model.

14. The battery management method of claim 1, further comprising:

comparing the battery safety to a threshold and generating a control signal to control an output of a feedback to a user based on a result of the comparing.

15. The battery management method of claim 1, further comprising:

performing a first comparing of the battery safety to a first threshold and, when a result of the first comparing indicates that the battery safety fails to meet the first threshold, performing a second comparing of the battery safety to a second threshold; and

performing cell balancing in response to the battery safety being determined to meet the second threshold and generating a control signal to control an output of a feedback to a user in response to the battery safety being determined to fail to meet the second threshold.

16. The battery management method of claim 1, wherein the calculating of the unbalance data comprises deriving the unbalance data based on the physical quantity difference information having an extent corresponding to a predetermined time window size, and storing the derived unbalance data in a buffer having a capacity corresponding to the predetermined time window size.

17. The battery management method of claim 1, wherein:

the calculating of the unbalance data comprises deriving the unbalance data from first and second physical quantity difference information, of the physical quantity difference information, respectively calculated based on different first and second physical quantities, of the sensed physical quantities, and

the first and second physical quantities representing respective measurements of different physical properties of one or more of the plurality of batteries.

18. The battery management method of claim 1, wherein the physical quantity difference information comprises at least one of:

first difference information indicating respective first differences between the average value of the physical quantities and each of the physical quantities or indicates an average value of the respective first differences;

second difference information indicating a second difference between the maximum value and the minimum value of the physical quantities;

third difference information indicating respective third differences between the maximum value and each of the physical quantities or indicates an average value of the respective third differences; and

fourth difference information indicating respective fourth differences between the minimum value and the each of the physical quantities or indicates an average value of the respective fourth differences.

19. The battery management method of claim 18, wherein the physical quantity difference information comprises at least one of the first difference information, second difference information, third difference information, and fourth difference information, for each of first physical quantities that are voltage measurements and second physical quantities that are temperature measurements.

20. The battery management method of claim 19, further comprising adding normalized values of the unbalance data corresponding to the first physical quantities to normalized values of the unbalance data corresponding to the second physical quantities, to determine an unbalance value for the plurality of batteries.

21. A battery management apparatus comprising:

an interface configured to acquire physical quantity data indicating a sensed physical quantity for each of a plurality of batteries; and

one or more processing devices configured to;

determine, based on the sensed physical quantities, any one of an average, a minimum, and a maximum value of the sensed physical quantities;

determine physical quantity difference information by determining a difference between each of the sensed physical quantities and the any one of the determined average, the determined minimum, and the determined maximum value of the sensed physical quantities,

calculate unbalance data based on the physical quantity difference information,

obtain corresponding data of the unbalance data by performing a dimensionality reduction of the unbalance data to project the unbalance data to a predetermined space,

determine distribution information indicating a distribution of the corresponding data in the predetermined space, and

determine a battery safety for one or more of the plurality of batteries based on the distribution information of the corresponding data.

22. The battery management apparatus of claim 21, further comprising:

the plurality of batteries; and

a plurality of sensors configured to measure the physical quantities from the plurality of batteries when the physical quantities of the plurality of batteries are dynamically varying, and to provide the measured physical quantities to the interface for the acquiring of the physical quantity data.

23. The battery management apparatus of claim 21, wherein the battery management apparatus is an electric control unit (ECU), or in local communication with the ECU, of an electric or hybrid-electric vehicle that includes the plurality of batteries and a plurality of sensors configured to measure the physical quantities from the plurality of batteries when the physical quantities of the plurality of batteries are dynamically varying and to provide the measured physical quantities to the interface for the acquiring of the physical quantity data.

24. A non-transitory processor readable recording medium comprising processor readable code to control one or more processing devices to implement a battery management method, the method including:

acquiring physical quantity data indicating a sensed physical quantity for each of a plurality of batteries;

determining, based on the sensed physical quantities, any one of an average, a minimum, and a maximum value of the sensed physical quantities;

determining physical quantity difference information by determining a difference between each of the sensed physical quantities and the any one of the determined average, the determined minimum, and the determined maximum value of the sensed physical quantities;

calculating unbalance data based on the physical quantity difference information;

obtaining corresponding data of the unbalance data by performing a dimensionality reduction of the unbalance data to project the unbalance data to a predetermined space;

determining distribution information indicating a distribution of the corresponding data in the predetermined space; and

determining a battery safety for one or more of the plurality of batteries based on the distribution information of the corresponding data.