Method for battery management of a battery with a charge state compensation system and battery management system

• US 10,532,665 B2
• Filed: 03/20/2015
• Issued: 01/14/2020
• Est. Priority Date: 03/31/2014
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Original Assignee: Robert Bosch GmbH
• Inventors: Brochhaus, Christoph
• Primary Examiner(s): Pacheco, Alexis B
• Application Number:
  US15/301,034
• Publication Number:
  US 20170021738A1
• Time in Patent Office: 1,761 Days
• Field of Search: 320109, 320107, 320108, 320112, 320118, 320116, 320134, 320119, 320128
• CPC Class Codes: B60L 53/00 Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
• CPC Class Codes: B60L 58/00 Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

The disclosure relates to a method for the battery management of a battery which comprises a plurality of battery cells and which is fitted with a battery management system for monitoring battery functionality and with a charge state compensation system, wherein the battery management system comprises a plurality of sensor control devices and a main control device, said control devices being connected with one another via a communication channel, and wherein the charge state compensation system has a number of charge state compensation resistors being put into operation via the sensor control devices for a charge state compensation of battery cells. The sensor control devices save information about performed charge state compensations in non-volatile memory. A computer program, a battery management system, a battery system and a motor vehicle, which are designed to carry out the method, are also described.

Claims

1. A method for battery management of a battery, the battery having a plurality of battery cells, a charge state balancing system, and a battery management system, the method comprising:

monitoring operating parameters of the plurality of battery cells with the battery management system, the battery management system including a plurality of sensor control devices and a primary control device which are interconnected via a communication channel;

operating, with the sensor control devices, a plurality of charge state balancing resistors of the charge state balancing system to balance charge states of the battery cells; and

detecting, with the sensor control devices, and storing, in first nonvolatile memories of the sensor control devices, (i) a total number of temperature changes of each charge state balancing resistor in the plurality of charge state balancing resistors and (ii) a cumulative duration of charge state balancing performed with each charge state balancing resistor in the plurality of charge state balancing resistors; and

resetting to zero, with the primary control device, (i) the total number of temperature changes of a respective charge state balancing resistor in the plurality of charge state balancing resistors and (ii) the cumulative duration of charge state balancing performed with a respective charge state balancing resistor in the plurality of charge state balancing resistors in response to a replacement of the respective charge state balancing resistor.

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

ascertaining, with the primary control device, a charge state balancing requirement of the battery cells at an end of a driving cycle;

communicating the charge state balancing requirement to the sensor control devices; and

deactivating the primary control device after communicating the charge state balancing requirement and before operating the plurality of charge state balancing resistors of the charge state balancing system to balance charge states of the battery cells.

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

transmitting, with the sensor control devices, (i) the total number of temperature changes of each charge state balancing resistor in the plurality of charge state balancing resistors and (ii) the cumulative duration of charge state balancing performed with each charge state balancing resistor in the plurality of charge state balancing resistors to the primary control device at an end of a driving cycle.

4. The method as claimed in claim 3, further comprising:

storing, in a second nonvolatile memory of the primary control device, (i) the total number of temperature changes of each charge state balancing resistor in the plurality of charge state balancing resistors and (ii) the cumulative duration of charge state balancing performed with each charge state balancing resistor in the plurality of charge state balancing resistors.

5. A computer program for a battery management system of a battery, the battery having a plurality of battery cells and a charge state balancing system, the computer program configured to, when executed on a the battery management system:

monitor operating parameters of the plurality of battery cells of the battery with the battery management system, the battery management system including a plurality of sensor control devices and a primary control device which are interconnected via a communication channel;

operate, with the sensor control devices, a plurality of charge state balancing resistors of the charge state balancing system to balance charge states of the battery cells;

detect, with the sensor control devices, and store, in first nonvolatile memories of the sensor control devices, (i) a total number of temperature changes of each charge state balancing resistor in the plurality of charge state balancing resistors and (ii) a cumulative duration of charge state balancing performed with each charge state balancing resistor in the plurality of charge state balancing resistors; and

resetting to zero, with the primary control device, (i) the total number of temperature changes of a respective charge state balancing resistor in the plurality of charge state balancing resistors and (ii) the cumulative duration of charge state balancing performed with a respective charge state balancing resistor in the plurality of charge state balancing resistors in response to a replacement of the respective charge state balancing resistor.