Abnormal cell diagnosing method and battery system applying the same
AssigneeLG Energy Solution, Ltd.
InventorJunguk Park
Life of this patent
Estimating the term…
Abstract
A battery system includes: a battery pack including a plurality of battery cells; and a battery management system for setting numbers to the battery cells by measuring cell voltages of the respective battery cells at a wake-up time, detecting a maximum cell voltage and a minimum cell voltage by periodically measuring the cell voltage of the respective battery cells after the wake-up, comparing the minimum cell voltage and the cell voltage of at least one first diagnosis target battery cell, comparing the maximum cell voltage and the cell voltage of at least one second diagnosis target battery cell, and diagnosing whether the diagnosis target battery cell is abnormal according to results of the comparison.
Claims12
A battery system comprising:
- a battery pack including a plurality of battery cells;
- and
- a battery management system configured to:
- (i) at an initial time:
- initially measure respective cell voltages of the battery cells;
- classify two or more of the plurality of battery cells as at least one a first diagnosis target battery cell and at least one second diagnosis target battery cell, respectively, based on the initially measured respective cell voltages of the at least two battery cells, wherein the at least two battery cells are classified such that at the initial time each first diagnosis target battery cell has a higher voltage than each second diagnosis target battery cell;
- (ii) after the initial time, periodically measure the respective cell voltages of the battery cells;
- (iii) for a given time at which the respective cell voltages of the battery cells are measured:
- detect a maximum cell voltage and a minimum cell voltage among the respective cell voltages measured at the given time;
- compare the minimum cell voltage to a measured cell voltage of each one of the at least one first diagnosis target battery cells at the given time,
- compare the maximum cell voltage to a measured cell voltage of each one of the at least one second diagnosis target battery cells at the given time,
- diagnose whether either or both of the first and second diagnosis target battery cells is abnormal according to results of the comparisons, and
- (iv) stop operation of the abnormal battery cells according to the diagnosis.
A method for diagnosing an abnormal cell of a battery system including a plurality of battery cells, the method comprising:
- (i) at an initial time:
- initially measuring, by the battery management system, respective cell voltages of the battery cells;
- classifying, by the battery management system two or more of the plurality of battery cells as at least one first diagnosis target battery cell and at least one second diagnosis target battery cell, respectively, based on the initially measured respective cell voltages of the at least two battery cells, wherein the at least two battery cells are classified such that at the initial time each first diagnosis target battery cell has a higher voltage than each second diagnosis target battery cell;
- (ii) after the initial time, periodically measuring, by the battery management system, respective cell voltages of the battery cells;
- (iii) for a given time at which the respective cell voltages of the battery cells are measured:
- detecting a minimum cell voltage and a maximum cell voltage from among the respective voltages measured at the given time;
- determining, by the battery management system, whether the respective cell voltages of the one or more first diagnosis target battery cells are equal to or less than the minimum cell voltage at the given time;
- determining, by the battery management system, whether the respective cell voltages of the one or more second diagnosis target battery cells are equal to or greater than the maximum cell voltage at the given time;
- diagnosing, by the battery management system, whether either or both of the one or more first diagnosis target battery cells and the one or more second diagnosis target battery cells are abnormal based on results of the determinations;
- and
- (iv) stopping, by the battery management system, operation of the abnormal battery cells according to the diagnosis.
Dependencies are inferred from the claim text.