Battery management system and method of managing battery using the same

1 . A battery management system comprising:

a battery management system (BMS) monitoring a battery, turning on/off a main relay connected to an output of the battery, and receiving power through a power switch;

a sensor unit measuring a state of the battery to generate battery state information; and

a controller configured to: receive the battery state information from the sensor unit, detect an occurrence of a failure event of the battery based on the battery state information, control the main relay based on whether a maintenance time of the failure event being longer than a reference time T 1d and whether the number of times of the occurrence of the failure event being greater than a reference set value S th , and provide a turn on/off command to the power switch,

wherein the controller accumulatively increases a stress index of the battery when the failure event occurs, and turns off the main relay when a duration of the failure event is equal to or shorter than T 1d and the stress index of the battery is greater than S th .

2 . The battery management system of claim 1 , wherein the battery state information includes at least one of voltage information, current information, and temperature information of the battery.

3 . The battery management system of claim 1 , wherein the controller determines that the failure event has occurred when a measured voltage of the battery exceeds a reference voltage V max or a measured temperature of the battery exceeds a reference temperature T max .

4 . The battery management system of claim 1 , wherein when the maintenance time of the failure event is longer than T 1d , the controller diagnoses the failure event and determines whether or not the battery is abnormal for a predetermined time T 2 .

5 . The battery management system of claim 4 , wherein the controller turns off the main relay when the predetermined time T 2 is longer than a reference time T 2th greater than T 1d .

6 . The battery management system of claim 4 , wherein in a case where the predetermined time T 2 is equal to or shorter than a reference time T 2th greater than T 1d , when a current of the battery is I0 that is a predetermined reference, the controller provides a turn-off command to the power switch.

7 . The battery management system of claim 4 , wherein in a case where the predetermined time T 2 is equal to or shorter than a reference time T 2th greater than T 1d , when a current of the battery is greater than 10 that is a predetermined reference, the controller turns off the main relay, and provides a turn-on maintenance command to the power switch.

8 . The battery management system of claim 1 , wherein the controller determines that the failure event has occurred when a measured voltage of the battery exceeds a reference voltage V max or a measured temperature of the battery exceeds a reference temperature T max , and

the stress index of the battery is a count value of the number of times the measured voltage of the battery exceeds the reference voltage V max or the measured temperature of the battery exceeds the reference temperature T max .

9 . The battery management system of claim 1 , wherein the controller determines that the failure event has occurred when a measured voltage of the battery exceeds a reference voltage V max or a measured temperature of the battery exceeds a reference temperature T max , and

the stress index of the battery is a degree to which the measured voltage of the battery exceeds the reference voltage V max or a degree to which the measured temperature of the battery exceeds the reference temperature T max .

10 . A method of managing a battery using a battery management system (BMS) monitoring the battery, turning on/off a main relay connected to an output of the battery, and receiving power through a power switch, comprising:

measuring battery state information;

detecting an occurrence of a failure event of the battery based on the battery state information;

controlling the main relay based on whether a maintenance time of the failure event being longer than a reference time T 1d and whether the number of times of the occurrence of the failure event being greater than a reference set value S th ; and

turning on/off the power switch; and

accumulatively increasing a stress index of the battery when the failure event occurs, and turning off the main relay when a duration of the failure event is equal to or shorter than T 1d and the stress index of the battery is greater than S th .

11 . The method of managing a battery of claim 10 , wherein the battery state information includes at least one of voltage information, current information, and temperature information of the battery.

12 . The method of managing a battery of claim 10 , wherein it is determined that the failure event has occurred when a measured voltage of the battery exceeds a reference voltage V max or a measured temperature of the battery exceeds a reference temperature T max .

13 . The method of managing a battery of claim 10 , further comprising: when the maintenance time of the failure event is longer than a reference time T 1d , diagnosing the failure event and determining whether or not the battery is abnormal for a predetermined time T 2 .

14 . The method of managing a battery of claim 13 , further comprising turning off the main relay when the predetermined time T 2 is longer than a reference time T 2th greater than T 1d .

15 . The method of managing a battery of claim 13 , further comprising: in a case where the predetermined time T 2 is equal to or shorter than a reference time T 2th greater than T 1d , when a current of the battery is I0 that is a predetermined reference, turning off the power switch, and when the current of the battery is greater than I0 that is the predetermined reference, turning off the main relay and maintaining turn-on of the power switch.