METHOD FOR DETECTING ANOMALIES IN A BATTERY CELL, AND SHORT-CIRCUIT SENSOR SYSTEM

• US 20170082693A1
• Filed: 02/26/2015
• Published: 03/23/2017
• Est. Priority Date: 03/18/2014
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: LEIDICH, STEFAN, Schumann, Schumann, Henrici, Fabian
• Granted Patent: US 10,073,143 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 19/12 Measuring rate of change
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: G01R 31/52 Testing for short-circuits, leakage current or ground faults
• 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: Y02E 60/10 Energy storage using batteries

Abstract

The invention relates to a method for detecting anomalies in a battery cell (22), wherein a short-circuit sensor system (20) detects events (44) in a signal of a terminal voltage of the battery cell, which events have successive edges in an interval of time of microseconds, and wherein events detected by the short-circuit sensor system are transmitted to a battery management system (16) which determines anomalies in the battery cells using the detected events. A short-circuit sensor system (20) and a battery system (12) which are set up to carry out the method are also stated.

Claims

1. A method for detecting anomalies of a battery cell (22), the method comprising:

detecting, via a short-circuit sensor system, detects events (44) in a signal of a terminal voltage of the battery cell (22), which events have successive edges in an interval of time of microseconds, and

transmitting the events (44) detected by the short-circuit sensor system to a battery management system (16).

2. The method as claimed in claim 1, characterized in that the internal pressure of the battery cell (22) is measured for plausibilization of the events (44).

3. The method as claimed in claim 1, characterized in that the battery management system (16) operates the short-circuit sensor system (20) for detecting the events (44) in a state of the charging phase, in a state of the quiescent phase and in a state of the operating phase with different parameters.

4. The method as claimed in claim 3, characterized in that, in the case of an event (44) detected in the quiescent phase, the battery management system (16) rules out an anomaly of the battery cell (22) if a simultaneous voltage dip (46) of at least one further battery cell (22) is determined.

5. The method as claimed in claim 3, characterized in that, in the case of an event (44) detected in the charging phase, the battery management system (16) detects an anomaly of the battery cell (22) if a voltage spike of the terminal voltage is determined simultaneously in the case of at least one further battery cell (22).

6. A short-circuit sensor system (20) for detecting an anomaly of a battery cell (22), the system comprising:

a voltage sensor (24) and an evaluator (28), wherein the evaluator (28) is designed to detect events (44) in the signal of a terminal voltage of the battery cell (22) with successive edges in an interval of time of microseconds, and

a communication device (32) designed for communicating events (44) detected by the evaluator (28) to a battery management system (16).

7. The short-circuit sensor system (20) as claimed in claim 6, comprising a pressure sensor (30) for detecting a cell internal pressure.

8. The short-circuit sensor system (20) as claimed in claim 6, comprising a differentiator (26), which provides a signal of a differentiated terminal voltage of the battery cell (22).

9. The short-circuit sensor system (20) as claimed in claim 6, characterized in that the evaluator (28) has a threshold value detector.

10. The short-circuit sensor system (20) as claimed in claim 6, comprising a capacitor (80) connected in parallel with the battery cell (22).

11. The short-circuit sensor system (20) as claimed in claim 10, characterized in that the evaluator (28) has a narrow band detector.

12. A battery system (12) comprising a plurality of battery cells (22) and short-circuit sensor systems (20) as claimed in claim 6 which are respectively assigned to the battery cells (22) and comprising a battery management system (16) designed to determine anomalies of the battery cells (22) on the basis of detected events (44).