Battery management system for a battery cell with a pressure-sensitive film sensor

Patent metadata

Field	Value
Publication number	US-9531039-B2
Application number	US-201313904591-A
Country	US
Kind code	B2
Filing date	May 29, 2013
Priority date	Jun 1, 2012
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

A battery management system is configured for use with a battery having at least one battery cell with a cell housing and an electrode winding arranged inside the cell housing. The battery management system includes a battery state detection mechanism. The electrode winding is covered at least partially by a pressure-sensitive film sensor. The battery state detection mechanism is configured to read in a measured value, provided by the pressure-sensitive film sensor, or a variable derived from this measured value. The battery state detection mechanism uses the measured value/variable as an evaluation parameter to determine the battery state. The battery state detection mechanism is configured to determine a swelling force from swelling of the electrode winding due to the state of charge thereof by using the measured value/variable. The swelling force is used to further determine the state of charge or state of health of the battery cell.

First claim

What is claimed is:

1. A battery management system of a battery which has at least one battery cell including a cell housing and an electrode winding which is arranged inside the cell housing, the battery management system comprising:
a battery state detection mechanism; and
a pressure-sensitive film sensor positioned in contact with and covering at least certain areas of the electrode winding of the battery cell, the pressure-sensitive film sensor being configured to generate a measurement signal indicative of a pressure being applied to the pressure-sensitive film sensor by the electrode winding,
wherein the battery state detection mechanism receives the measurement signal from the pressure-sensitive film and determines,
a swelling force being generated by the electrode winding based on the pressure indicated by the measurement signal, and
wherein the swelling force is used for a further determination of a state of charge or of a state of health.

2. A motor vehicle comprising:
a drive system;
a battery connected to the drive system, the battery including a cell housing and an electrode winding arranged inside the cell housing; and
a battery management system for the battery, the battery management system including:
a pressure sensitive film sensor positioned in contact with and covering at least certain areas of the electrode winding of the battery cell, the pressure-sensitive film sensor being configured to generate a measurement signal indicative of a pressure being applied to the pressure-sensitive film sensor by the electrode winding; and
a battery state detection mechanism operably connected to the pressure-sensitive film sensor to receive the measurement signal the battery state detection mechanism being configured to determine a swelling force being generated by the electrode winding based on the pressure indicated by the measurement signal, and determine a state of charge or a state of health of the battery based on the swelling force.

3. A battery management system of a battery which has at least one battery cell including a cell housing and an electrode winding which is arranged inside the cell housing, the battery management system comprising:
a pressure sensitive film sensor positioned in contact with and covering at least certain areas of the electrode winding of the battery cell, the pressure-sensitive film sensor being configured to generate a measurement signal indicative of a pressure being applied to the pressure-sensitive film sensor by the electrode winding; and
a battery state detection mechanism operably connected to the pressure-sensitive film sensor to receive the measurement signal the battery state detection mechanism being configured to determine a swelling force being generated by the electrode winding based on the pressure indicated by the measurement signal, and determine a state of charge or a state of health of the battery based on the swelling force.

4. The battery management system as claimed in claim 3 , wherein:
the pressure-sensitive film sensor is configured to determine a maximum swelling force whenever the battery cell is completely charged from a maximum swelling of the electrode winding and a minimum swelling force whenever the battery cell is completely discharged from a minimum swelling of the electrode winding, and
the maximum swelling force and the minimum swelling force are evaluated by the battery state detection mechanism.

5. The battery management system as claimed in claim 4 , wherein:
the battery state detection mechanism is configured to calculate a mean value of the swelling force from the maximum swelling force and the minimum swelling force values by subtracting one half of a change in force from the maximum swelling force, and
the change in force is equal to the maximum swelling force minus the minimum swelling force.

6. The battery management system as claimed in claim 5 , wherein the battery state detection mechanism is configured to compare the calculated mean value of the swelling force with measured values of a respective charging/discharging cycle, which correspond to a battery cell type and are stored in the battery management system, and to determine the state of health of the battery cell based on a result of the comparison of the calculated mean value with the measured values of the respective charging/discharging cycle.

7. The battery management system as claimed in claim 4 , wherein:
the battery state detection mechanism is configured to compare at least one of the maximum swelling force, the minimum swelling force, and the change in force with a corresponding at least one of a measured maximum swelling force, a measured minimum swelling force, and a measured change in force of a respective charging/discharging cycle,
the measured maximum swelling force, the measured minimum swelling force, and the measured change in force values correspond to a battery cell type and are stored in the battery management system, and
the battery state detection mechanism is configured to determine the state of health of the battery cell based on a result of the comparison.

8. The battery management system as claimed in claim 7 , wherein:
the measured maximum swelling force, the measured minimum swelling force, and the measured change in force values are stored as a linear characteristic curve extracted from measurement series for a respectively present battery cell type, and
the measured maximum swelling force, the measured minimum swelling force, and the measured change in force values are stored inside the battery management system.

9. The battery management system as claimed in claim 7 , wherein:
the battery state detection mechanism is configured to detect whether a battery cell is in an opened state or is leaking based on a comparison of a measured swelling force with the measured minimum swelling force value of the respective charging/discharging cycle, and
the measured minimum swelling force value is stored in the battery management system.

10. The battery management system as claimed in claim 9 , wherein the battery management system is configured to generate a warning signal when the battery cell is in the opened state or is leaking and to transmit said warning signal to a central control unit.

11. The battery management system as claimed in claim 4 , wherein the battery state detection mechanism is configured to estimate the state of charge of the battery cell by dividing the swelling force minus the minimum swelling force by the maximum swelling force minus the minimum swelling force.

Assignees

• Bosch Gmbh Robert
• Samsung Sdi Co Ltd

Inventors

• Heubner Anne
• Has Remigius
• Ruehle Andreas
• Henrici Fabian

Classifications

• H01M10/48 Primary

  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 title

• H01M50/569

  Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals (battery terminal connectors with integrated measuring arrangements G01R31/364) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• G01R31/3606

  Physics · mapped topic