Application US20190131798

Method for Testing a Balanced Circuit
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US20190131798

1. A method for testing a balancing circuit for a battery that has a plurality of battery cells, the method comprising the steps of: (1) (4)

a) detecting first voltage states of the battery cells by way of a control unit;

b) activating the balancing circuit for a purpose of achieving voltage equalization of at least two of the battery cells;

c) detecting second voltage states of the battery cells by way of the control unit; and

d) determining, by way of the control unit, a functional capability of the balancing circuit on the basis of the first voltage states and the second voltage states of the battery cells.

2. The method as claimed in claim 1, wherein step a) comprises the steps of: (1) (2)

a1) detecting a first group of voltages of the battery cells; and

a2) calculating a first voltage difference between a highest voltage and a lowest voltage of the first group of voltages by way of the control unit.

3. The method as claimed in claim 2, wherein step c) comprises the steps of: (2) (2)

c1) detecting a second group of voltages of the battery cells; and

c2) calculating a second voltage difference between a highest voltage and a lowest voltage of the second group of voltages by way of the control unit.

4. The method as claimed in claim 3, wherein step d) comprises the steps of: (2) (2)

d1) calculating a difference value between the first voltage difference and the second voltage difference and comparing the difference value with a prescribed voltage value by way of the control unit; and

d2) determining, by way of the control unit, that the balancing circuit is not working if the difference value is smaller than a prescribed voltage value.

5. The method as claimed in claim 4, wherein the method further comprises the step of: (1) (1)

8. The method as claimed in claim 4, wherein the prescribed voltage value is between 0 mV and 10 mV. (0)

6. The method as claimed in claim 3, wherein step c1) is performed a specific time after step a1). (1) (0)

10. A device for testing a balancing circuit for a battery that has a plurality of battery cells, comprising: (2) (1)

a control unit operatively configured to execute a process that: detects first voltage states of the battery cells;

activates the balancing circuit for a purpose of achieving voltage equalization of at least two of the battery cells;

detects second voltage states of the battery cells; and

determines a functional capability of the balancing circuit on the basis of the first voltage states and the second voltage states of the battery cells.

11. The device as claimed in claim 10, wherein the device further comprises: (1) (3)

at least one voltmeter, wherein

the at least one voltmeter detects a first group of voltages of the battery cells; and

the control unit calculates a first voltage difference between a highest voltage and a lowest voltage of the first group of voltages.

12. The device as claimed in claim 11, wherein (1) (2)

the at least one voltmeter detects a second group of voltages of the battery cells; and

the control unit calculates a second voltage difference between a highest voltage and a lowest voltage of the second group of voltages.

13. The device as claimed in claim 12, wherein (1) (2)

15. A battery system, comprising: (1) (3)

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Application US20190131798

Method for Testing a Balanced Circuit

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