Method for data transmission on battery systems having a plurality of cells

• US 9,793,582 B2
• Filed: 09/09/2013
• Issued: 10/17/2017
• Est. Priority Date: 09/26/2012
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Poehler, Joerg
• Primary Examiner(s): Fraser, Stewart
• Assistant Examiner(s): WILLS, MONIQUE M
• Application Number:
  US14/431,640
• Publication Number:
  US 20150244033A1
• Time in Patent Office: 1,499 Days
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/0092 with use of redundant elements for safety purposes
• 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 31/3842 combining voltage and current measurements
• 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 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 2010/4278 Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
• 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

A method is provided for transmitting measured data from cells of a battery system, having a plurality of individual cells, to a control device, comprising the steps of identifying a first individual cell for which measured data are to be furnished at a first measured-data quality; identifying at least one further individual cell or which measured data are to be furnished at a second measured-data quality; the first measured-data quality being higher than the second measured-data quality; identifying the first-quality measured data; identifying the second-quality measured data; transferring the first-quality measured data to a control device using a data connection; and transferring the second-quality measured data after the first-quality measured data have been transferred.

Claims

1. A method for transmitting measured data of a plurality of individual cells of a battery system to a control device, the method comprising:

identifying a first of the individual cells, the measured data of which are to be transmitted using a data transmission of a first transmission quality;

identifying at least one further one of the individual cells, the measured data of which are to be transmitted using a data transmission of a second transmission quality, the first transmission quality being higher than the second transmission quality;

obtaining the measured data of the first of the individual cells;

obtaining the measured data of the at least one further one of the individual cells; and

based on the identifications, using a data connection to transmit to the control device the measured data of the first of the individual cells at the first transmission quality and the measured data of the at least one further one of the individual cells at the second transmission quality.

2. The method as recited in claim 1, wherein the first transmission quality is higher than the second transmission quality with respect to at least one of a sample transmission rate and an accuracy with which data is transmitted.

3. The method as recited in claim 1, wherein:

the transmissions are accomplished using a packet data bus;

during a period for which the identifications were made;

a first percentage of the obtained measured data of the first of the individual cells is included in data packets transmitted on the data packet bus; and

a second percentage of the obtained measured data of each of the at least one further one of the individual cells is included in the data packets; and

the first percentage is greater than the second percentage.

4. The method as recited in claim 1, wherein the transmission is performed by successively transmitting a plurality of data packets that each includes measured data of the first one of the individual cells and measured data of different ones of the at least one of the further one of the individual cells, without consecutive ones of the data packets including the measured data of any of the at least one of the further one of the individual cells so that a sample transmission rate of the first one of the individual cells is higher than a respective sample transmission rate of each of the at least one further one of the individual cells.

5. The method as recited in claim 1, wherein the measured data contains at least one of measured current data and measured voltage data of an individual cell.

6. The method as recited in claim 1, wherein the identification of the first one of the individual ones of the cells is based on a time interval since a last transmission for the respective individual cell at the first quality, on a temperature of the respective individual cell, and on a measured data value of the first individual cell that had been transmitted at the second transmission quality.

7. The method as recited in claim 1, wherein the identification of the first one of the individual ones of the cells is based on a current/voltage pair of the respective individual cell and on a temperature gradient of the respective individual cell.

8. The method as recited in claim 1, wherein the transmission of the measured data of the first one of the individual cells at the first transmission quality is carried out based on the identifications continually up to at least one of a time limit and until a convergence criterion of the measured data of the first one of the individual cells is reached, during a following period the measured data of the first one of the individual cells being transmitted at the second transmission quality and measured data of one of the at least one further one of the individual cells being transmitted at the first transmission quality.

9. The method as recited in claim 1, further comprising repeating the identifying steps, the obtaining steps, and the transmission with one of the at least one further one of the individual cells being identified as a cell whose measured data is to be transmitted at the first transmission quality and with the first one of the individual cells being identified as a cell whose measured data is to be transmitted at the second transmission quality.

10. A battery system, comprising:

a plurality of individual battery cells; and

a control device, wherein the battery system is configured to carry out a method for controlling transmission of measured data of the cells to the control device, the method including;

identifying a first of the individual cells, the measured data of which are to be transmitted using a data transmission of a first transmission quality;

identifying at least one further one of the individual cells, the measured data of which are to be transmitted using a data transmission of a second transmission quality, the first transmission quality being higher than the second transmission quality;

obtaining the measured data of the first of the individual cells;

obtaining the measured data of the at least one further one of the individual cells; and

based on the identifications, using a data connection to transmit to the control device the measured data of the first of the individual cells at the first transmission quality and the measured data of the at least one further one of the individual cells at the second transmission quality.

11. A vehicle, comprising:

a battery system that includes a plurality of individual battery cells and a control device, wherein the battery system is configured to carry out a method for controlling transmission of measured data of the cells to the control device, the method including;

identifying a first of the individual cells, the measured data of which are to be transmitted using a data transmission of a first transmission quality;

identifying at least one further one of the individual cells, the measured data of which are to be transmitted using a data transmission of a second transmission quality, the first transmission quality being higher than the second transmission quality;

obtaining the measured data of the first of the individual cells;

obtaining the measured data of the at least one further one of the individual cells; and

based on the identifications, using a data connection to transmit to the control device the measured data of the first of the individual cells at the first transmission quality and the measured data of the at least one further one of the individual cells at the second transmission quality.

12. The vehicle as recited in claim 11, wherein the vehicle includes one of an electric vehicle and a hybrid vehicle.