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US 12,613,289 B2Granted
Battery diagnosis apparatus, battery pack, electric vehicle, and battery diagnosis method
AssigneeLG Energy Solution, Ltd.
InventorsYong-Chul Sung, Cheol-Taek Kim
Life of this patent
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Abstract
A battery diagnosis apparatus includes a battery monitor to detect a voltage of each of a plurality of battery cells included in a battery module; and a control circuit to determine a latest value of a first voltage deviation indicating a difference between a voltage behavior of each battery cell and an average voltage behavior of the plurality of battery cells over a relaxation period from a start time of a resting event.
Claims15
A battery diagnosis apparatus, comprising:
- a battery monitor configured to detect a voltage of each of a plurality of battery cells included in a battery module;
- and
- a control circuit of an electrical vehicle configured to:
- determine a latest value of a first voltage deviation indicating a difference between a voltage behavior of a battery cell of the plurality of battery cells and an average voltage behavior of the plurality of battery cells over a relaxation period from a start time of a resting event in which the battery module transitions from charging to resting,
- when a total number of times the resting event has taken place is equal to or larger than a reference number of times;
- determine a latest value of a second voltage deviation of the battery cell, wherein the second voltage deviation corresponds to the latest value of the first voltage deviation applied to a smoothing algorithm;
- determine a latest value of a third voltage deviation of the battery cell indicating a first difference between the latest value of the first voltage deviation and the latest value of the second voltage deviation;
- determine a latest value of a fourth voltage deviation of the battery cell indicating a second difference between the latest value of the third voltage deviation and a previous value of the third voltage deviation;
- determine a latest value of a threshold deviation of the battery cell using a dispersion of a time series of the fourth voltage deviation having a predetermined size;
- and
- determine whether the battery cell has a micro short circuit based on a comparison of the latest value of the third voltage deviation with the latest value of the threshold deviation.
8 more elements
A battery diagnosis method, comprising:
- detecting, by a battery monitor, a voltage of each of a plurality of battery cells included in a battery module;
- determining, by a control circuit of an electrical vehicle-processor, a latest value of a first voltage deviation indicating a difference between a voltage behavior of a battery cell of the plurality of battery cells and an average voltage behavior of the plurality of battery cells over a relaxation period from a start time of a resting event in which a battery module including the plurality of battery cells transitions from charging to resting,
- when a total number of times the resting event has taken place is equal to or larger than a reference number of times;
- determining, by the control circuit, a latest value of a second voltage deviation of the battery cell, wherein the second voltage deviation corresponds to the latest value of the first voltage deviation applied to a smoothing algorithm-;
- determining, by the control circuit, a latest value of a third voltage deviation of the battery indicating a first difference between the latest value of the first voltage deviation and the latest value of the second voltage deviation, determining, by the control circuit, a latest value of a fourth voltage deviation of the battery cell indicating a second difference between the latest value of the third voltage deviation and a previous value of the third voltage deviation;
- determining, by the control circuit, a latest value of a threshold deviation of the battery cell using a dispersion of a time series of the fourth voltage deviation having a predetermined size;
- and
- determining, by the control circuit, whether the battery cell has a micro short circuit based on a comparison of the latest value of the third voltage deviation with the latest value of the threshold deviation.
5 more elements
Dependencies are inferred from the claim text.