Battery system and associated method for determining the internal resistance of battery cells or battery modules of said battery system
First Claim
1. A method for determining an internal resistance of battery cells of battery modules of a battery, comprising:
- measuring a first voltage of at least one battery cell of a first battery module of the battery modules at a first time, wherein the first battery module is decoupled from a battery module string in response to a first control signal;
connecting, in response to a second control signal, the first battery module to the battery module string after the first voltage measurement to enable a change in the first voltage of the at least one battery cell in response to a current flowing through the first battery module;
measuring a second voltage of the at least one battery cell at a second time after the connection of the first battery module to the battery module string, wherein the first battery module is connected to the battery module string for a predefined time interval; and
determining the internal resistance after the measurement of the second voltage of the at least one battery cell with reference to (i) a difference between the first voltage and the second voltage and (ii) a current value of a current flowing through the first battery module.
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Abstract
A method for determining the internal resistance of battery cells of battery modules of a battery includes measuring a first voltage of at least one battery cell of a first battery module at a first time. The first battery module is decoupled from the battery module string in response to a control signal. The first battery module is connected to the battery module string after the first voltage measurement to enable a change in the first voltage of the at least one battery cell in response to a current flowing through the first battery module. A second voltage is measured at a second time where the first battery module is connected to the battery module string for a predefined time interval. The internal resistance is determined with reference to a difference between the first and the second voltage and the current flowing through the first battery module.
11 Citations
10 Claims
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1. A method for determining an internal resistance of battery cells of battery modules of a battery, comprising:
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measuring a first voltage of at least one battery cell of a first battery module of the battery modules at a first time, wherein the first battery module is decoupled from a battery module string in response to a first control signal; connecting, in response to a second control signal, the first battery module to the battery module string after the first voltage measurement to enable a change in the first voltage of the at least one battery cell in response to a current flowing through the first battery module; measuring a second voltage of the at least one battery cell at a second time after the connection of the first battery module to the battery module string, wherein the first battery module is connected to the battery module string for a predefined time interval; and determining the internal resistance after the measurement of the second voltage of the at least one battery cell with reference to (i) a difference between the first voltage and the second voltage and (ii) a current value of a current flowing through the first battery module. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A battery system, comprising:
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a battery including a battery module string having a plurality of series-connected battery modules, each of the battery modules having at least one battery cell, and an actuable coupling unit, each of the battery modules are configured to be selectively connected to and decoupled from the battery module string with the coupling units to generate a settable output voltage of the battery; at least one monitoring unit configured to monitor the battery modules and measure at least one of cell voltages and battery module voltages; at least one current measuring unit interconnected with the battery module string; and a control and readout unit connected to (i) the coupling units, (ii) the at least one monitoring unit, and (iii) the at least one current measuring unit, the control and readout unit is configured to; measure a first voltage of the at least one battery cell of a first battery module of the battery modules at a first time, wherein the first battery module is decoupled from a battery module string in response to a first control signal; connect, in response to a second control signal, the first battery module to the battery module string after the first voltage measurement to enable a change in the first voltage of the at least one battery cell in response to a current flowing through the first battery module; measure a second voltage of the at least one battery cell at a second time after the connection of the first battery module to the battery module string, wherein the first battery module is connected to the battery module string for a predefined time interval; and determine the internal resistance after the measurement of the second voltage of the at least one battery cell with reference to (i) a difference between the first voltage and the second voltage and (ii) a current value of a current flowing through the first battery module. - View Dependent Claims (9)
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10. A motor vehicle, comprising:
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an electric motor; and a battery system connected to the electric motor, the battery system including; a battery including a battery module string having a plurality of series-connected battery modules, each of the battery modules having at least one battery cell, and an actuable coupling unit, each of the battery modules are configured to be selectively connected to and decoupled from the battery module string with the coupling units to generate a settable output voltage of the battery; at least one monitoring unit configured to monitor the battery modules and measure at least one of cell voltages and battery module voltages; at least one current measuring unit interconnected with the battery module string; and a control and readout unit connected to (i) the coupling units, (ii) the at least one monitoring unit, and (iii) the at least one current measuring unit, the control and readout unit is configured to; measure a first voltage of the at least one battery cell of a first battery module of the battery modules at a first time, wherein the first battery module is decoupled from a battery module string in response to a first control signal; connect, in response to a second control signal, the first battery module to the battery module string after the first voltage measurement to enable a change in the first voltage of the at least one battery cell in response to a current flowing through the first battery module; measure a second voltage of the at least one battery cell at a second time after the connection of the first battery module to the battery module string, wherein the first battery module is connected to the battery module string for a predefined time interval; and determine the internal resistance after the measurement of the second voltage of the at least one battery cell with reference to (i) a difference between the first voltage and the second voltage and (ii) a current value of a current flowing through the first battery module.
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Specification