Rapid charging control device and method

Abstract

A quick charge control device according to one embodiment of the present invention includes a measurement unit configured to measure a voltage of a battery; and a control unit configured to estimate a SOC of the battery based on the voltage of the battery, determine a charge C-RATE corresponding to the estimated SOC based on a charging profile preset to indicate a correspondence relationship between the SOC and a charge C-RATE, and cut off charging of the battery for a predetermined time if the charge C-RATE corresponding to the estimated SOC is changed.

Claims

1. A measuring unit for measuring the battery voltage, Includes a control unit configured to estimate the State of Charge (SOC) of the battery based on the battery voltage, determine the charge C-RATE corresponding to the estimated SOC based on a pre-configured charge profile that shows the correspondence between the SOC and the charge C-RATE, and interrupt the charging of the battery for a predetermined period of time if the charge C-RATE corresponding to the estimated SOC changes, The control unit, The system is configured to calculate the resistance value of the battery based on the voltage change during the predetermined time period, and to diagnose the state of the battery based on the calculated resistance value. A rapid charging control device is configured to calculate the resistance value each time the charging of the battery is interrupted for a predetermined period of time during multiple charging cycles, and to diagnose the state of the battery by comparing the resistance values ​​of the corresponding charging C-RATEs.

2. The aforementioned charging profile is It is configured to include multiple SOC sections in which the corresponding charge C-RATE is set, The control unit, The rapid charging control device according to claim 1, characterized in that, as the estimated SOC increases, when it reaches the upper limit of the current SOC interval to which the estimated SOC belongs, the charging of the battery is interrupted for a predetermined period of time, and the charging C-RATE for the battery is changed to the charging C-RATE corresponding to the next SOC interval.

3. The control unit, The rapid charging control device according to claim 2, characterized in that it is configured to resume charging the battery with the changed charging C-RATE after the predetermined time has elapsed.

4. The aforementioned charging C-RATE is, The rapid charging control device according to claim 2, characterized in that as the estimated SOC increases, it is set to become so small that the SOC interval to which the estimated SOC belongs changes.

5. The control unit, The rapid charging control device according to claim 1, characterized in that it is configured to diagnose whether lithium metal has been deposited in the battery based on the resistance value calculated from a series of charging cycles among the same corresponding charging C-RATE resistance values.

6. The control unit, The rapid charging control device according to claim 5, characterized in that it is configured to calculate the resistance fluctuation rate of the resistance value with respect to the BOL resistance value calculated from the first charging cycle of the battery, and to diagnose that lithium metal has been deposited in the battery if the difference in the resistance fluctuation rates calculated from the successive charging cycles is greater than or equal to a preset critical value.

7. The control unit, The rapid charging control device according to claim 5, characterized in that it is configured to diagnose that lithium metal has been deposited in the battery if the ratio of the resistance difference to the BOL resistance value calculated from the first charging cycle of the battery is equal to or greater than a preset critical value.

8. A measuring unit for measuring the voltage of a battery, Includes a control unit configured to estimate the State of Charge (SOC) of the battery based on the battery voltage, determine the charge C-RATE corresponding to the estimated SOC based on a pre-configured charge profile that shows the correspondence between the SOC and the charge C-RATE, and interrupt the charging of the battery for a predetermined period of time if the charge C-RATE corresponding to the estimated SOC changes, The aforementioned charging profile is The system is configured to show the correspondence between the charging C-RATE and the SOC corresponding to the maximum point or inflection point of the resistance profile that is pre-set to correspond to the charging C-RATE. The aforementioned resistance profile is A rapid charging control device characterized by being set to show the correspondence between the resistance value corresponding to the charging C-RATE and the SOC.

9. The aforementioned charging profile is If the resistance profile has a maximum point, the SOC corresponding to the maximum point is set to correspond to the charge C-RATE. The rapid charging control device according to claim 8, characterized in that, when the resistance profile does not have a maximum point and does have an inflection point, the SOC corresponding to the inflection point is set to correspond to the charging C-RATE.

10. The aforementioned charging profile is The rapid charging control device according to claim 9, characterized in that it is configured such that the SOC corresponding to the charging C-RATE increases as the charging C-RATE decreases.

11. A battery pack comprising a rapid charging control device according to any one of claims 1 to 10.

12. A rapid charging control method performed by a rapid charging control device, The voltage measurement stage measures the battery voltage, An SOC estimation step in which the SOC of the battery is estimated based on the voltage of the battery, A charging C-RATE determination step, which determines the charging C-RATE corresponding to the estimated SOC based on a pre-set charging profile that shows the correspondence between SOC and charging C-RATE, If the charge C-RATE corresponding to the estimated SOC changes, a charge interruption step is taken to interrupt the charging of the battery for a predetermined period of time. Following the charging interruption step, there is a resistance calculation step in which the resistance value of the battery is calculated based on the voltage change during the predetermined time, The process includes a battery diagnostic step in which the state of the battery is diagnosed based on the calculated resistance value, A rapid charging control method characterized by calculating the resistance value each time the charging of the battery is interrupted for a predetermined period of time in multiple charging cycles, and diagnosing the state of the battery by comparing the resistance values ​​of the same corresponding charging C-RATE.

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