BATTERY SYSTEM WITH CELL VOLTAGE DETECTING UNITS

• US 20130300426A1
• Filed: 08/12/2011
• Published: 11/14/2013
• Est. Priority Date: 09/14/2010
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Original Assignee: Robert Bosch GmbH, Samsung SDI Company Limited
• Inventors: Butzmann, Stefan
• Granted Patent: US 9,921,270 B2
• Time in Patent Office: Days
• US Class Current: 324/434
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• 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 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/4285 Testing apparatus
• 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: 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

Abstract

A battery system with at least one module includes a plurality of battery cells. A cell voltage detecting circuit is associated with each battery cell of the plurality of battery cells. The cell voltage detecting circuits of the at least one module are connected to a multiplexer. An output of the multiplexer is connected to a communication bus via an analog-digital converter. The communication bus is connected to an evaluating unit. The multiplexer is additionally connected to at least one auxiliary voltage source that is known to the evaluating unit. In a method for monitoring a battery system with at least one module including a plurality of battery cells, a voltage of each of the battery cells is detected and fed to an evaluating unit via a cell voltage detecting unit. An output signal of the cell voltage detecting unit is tested for plausibility.

Claims

1. A battery system, comprising:

an evaluation unit;

an analog-to-digital converter;

a communication bus connected to the evaluation unit;

a multiplexer having an output connected via the analog-to-digital converter to the communication bus, the multiplexer also being connected to at least one auxiliary voltage source which is known to the evaluation unit; and

at least one module, including a multiplicity of battery cells, wherein each battery cell of the multiplicity of battery cells has an associated cell voltage sensing circuit, and wherein the cell voltage sensing circuits of the at least one module are connected to the multiplexer.

2. The battery system as claimed in claim 1, wherein the auxiliary voltage source is a constant voltage source.

3. The battery system as claimed in claim 1, wherein the auxiliary voltage source is a pulsating voltage source.

4. The battery system as claimed in claim 3, wherein the pulsating auxiliary voltage source is a low frequency oscillator.

5. The battery system as claimed in claim 4, wherein the low frequency oscillator is a square wave oscillator.

6. A method for monitoring a battery system having at least one module having a multiplicity of battery cells, comprising:

sensing a voltage for each battery cell of the multiplicity of battery cells;

supplying the voltage for each battery cell via a cell voltage sensing unit to an evaluation unit; and

checking an output signal from the cell voltage sensing unit for plausibility.

7. The method as claimed in claim 6, further comprising:

routing at least one defined auxiliary voltage which is known to the evaluation unit via the cell voltage sensing unit; and

evaluating the at least one defined auxiliary voltage.

8. A motor vehicle comprising:

a drive system; and

a battery system, including;

an evaluation unit;

an analog-to-digital converter;

a communication bus connected to the evaluation unit;

a multiplexer having an output connected via the analog-to-digital converter to the communication bus, the multiplexer also being connected to at least one auxiliary voltage source which is known to the evaluation unit; and

at least one module, including a multiplicity of battery cells, wherein each battery cell of the multiplicity of battery cells has an associated cell voltage sensing circuit, and wherein the cell voltage sensing circuits of the at least one module are connected to the multiplexer, and

wherein the battery system is connected to the drive system in the motor vehicle.