Apparatus and method for diagnosing battery cell defect

1. An apparatus for diagnosing a battery cell defect, comprising:

a battery having a plurality of battery cells;

a sensing portion configured to sense the battery to generate sensing information;

a calculation portion configured to calculate real used power and a cell voltage of each of the plurality of battery cells using the generated sensing information;

a monitoring portion configured to store information on whether the battery is overused in the form of a power monitoring set using the calculated real used power; and

a determination portion configured to determine, when the calculated cell voltage reaches a preset lower limit voltage value, whether each of the plurality of battery cells fails using the power monitoring set and a cell voltage deviation.

2. The apparatus of claim 1 , wherein the power monitoring set is data indicating a result of comparing whether the calculated real used power for a first time period is larger than a usable power limit value.

3. The apparatus of claim 2 , wherein:

the data is digital data, and

the data is “1” when the calculated real used power is larger than a current usable power limit value and is “0” when the calculated real used power is smaller than the current usable power limit value.

4. The apparatus of claim 2 , wherein the usable power limit value is determined according to a matching of a preset lookup table with the sensing information of the battery.

5. The apparatus of claim 4 , wherein the sensing information is at least one of a temperature and a State of Charge (SOC) of the battery.

6. The apparatus of claim 2 , wherein the first time period is a time period before the usable power limit value reaches a specific value.

7. The apparatus of claim 6 , wherein the failure determination of each of the plurality of battery cells is performed according to whether or not to satisfy a first condition under which the usable power limit value reaches the specific value, a second condition under which the cell voltage deviation is more than or equal to a preset reference value, and a third condition under which the first and second conditions are maintained for a second time period.

8. The apparatus of claim 1 , wherein the calculated cell voltage is a cell minimum voltage.

9. The apparatus of claim 1 , further comprising a storage portion configured to store defect detection according to a failure status in the form of a Diagnostic Trouble Code (DTC).

10. The apparatus of claim 9 , further comprising an output configured to output the defect detection in a combined form of graphics, characters, sound, and warning lamp lighting.

11. A method for diagnosing a battery cell defect, comprising:

sensing a battery having a plurality of battery cells to generate sensing information by a sensing portion;

calculating real used power and a cell voltage of each of the plurality of battery cells using the generated sensing information by a calculation portion;

performing monitoring operation by storing information on whether the battery is overused in the form of a power monitoring set using the calculated real used power by a monitoring portion;

determining whether the calculated cell voltage reaches a preset lower limit voltage value by a determination portion; and

determining failure of the plurality of battery cells using the power monitoring set and a cell voltage deviation when it is determined that the calculated cell voltage reaches the lower limit voltage value by the determination portion.

12. The method of claim 11 , wherein the power monitoring set is data indicating a result of comparing whether the calculated real used power for a first time period is larger than a usable power limit value.

13. The method of claim 12 , wherein:

the data is digital data, and

the data is “1” when the calculated real used power is larger than a current usable power limit value and is “0” when the calculated real used power is smaller than the current usable power limit value.

14. The method of claim 12 , wherein the usable power limit value is determined according to a matching of a preset lookup table with the sensing information of the battery.

15. The method of claim 14 , wherein the sensing information is at least one of a temperature and a State of Charge (SOC) of the battery.

16. The method of claim 12 , wherein the first time period is a time period before the usable power limit value reaches a specific value.

17. The method of claim 16 , wherein the determining failure comprises:

identifying whether the usable power limit value reaches the specific value and at the same time whether the cell voltage deviation is more than or equal to a preset reference value;

determining, when it is identified as a first condition that the usable power limit value reaches the specific value and it is identified as a second condition that the cell voltage deviation is more than or equal to the preset reference value, whether the first and second conditions are maintained for a second time period; and

determining, when it is determined that the first and second conditions are maintained for the second time period, it is determined that a defect is detected.

18. The method of claim 11 , wherein the calculated cell voltage is a cell minimum voltage.

19. The method of claim 11 , wherein the determining failure further comprises storing defect detection according to the failure status in the form of a Diagnostic Trouble Code (DTC).

20. The method of claim 19 , further comprising outputting the detection of the defect in a combined form of graphics, characters, sound, and warning lamp lighting.