Lg Energy Solution, Ltd.

A-Ming Cha

Yoon-Jung Bae

Kyung-Hwa Woo

Hee-Seok Jeong

Bo-Mi Lim

Dae-Soo Kim

Hyun-Jun Choi

Hyun-Woo Park

Provided are an apparatus, method and battery pack for determining a degradation degree of a battery. The apparatus generates first sensing information indicating a voltage and a current of the battery while the battery is charged with a first constant current. The apparatus generates second sensing information indicating a voltage and a current of the battery for a second period during which the battery is discharged with a second constant current. The apparatus determines a first differential capacity curve based on the first sensing information and a second differential capacity curve based on the second sensing information. The apparatus is configured to determine the degradation degree of the battery based on a voltage value of a first charge feature point of the first differential capacity curve and a voltage value of a first discharge feature point of the second differential capacity curve.

Apparatus and method for determining degradation degree of battery and battery pack comprising the apparatus

An apparatus for diagnosing a battery includes a data obtaining unit configured to obtain battery information including voltage and current of a battery during a charging cycle of the battery, and a control unit configured to calculate a constant current charging capacity ratio and a constant voltage charging capacity ratio during the charging cycle based on the battery information, and determine a deterioration type of the battery based on the constant current charging capacity ratio and the constant voltage charging capacity ratio.

Apparatus and method for diagnosing battery

A battery management apparatus and method capable of preventing lithium plating from occurring in a battery cell by determining an optimal upper limit C-rate corresponding to the battery cell. In particular, since the charging and discharging of the battery cell may be controlled according to the determined upper limit C-rate, it is possible to prevent side reactions from occurring in the battery cell due to charging and discharging according to the high C-rate, and since the degradation of the battery cell may be slowed, the lifespan of the battery cell may be increased.

Battery management apparatus and method

A battery diagnosing apparatus includes a profile generating unit configured to obtain a battery profile representing a corresponding relationship between voltage and capacity of a battery, and generate a differential profile representing a corresponding relationship between the voltage and a differential capacity for the voltage based on the obtained battery profile, and a control unit configured to receive the differential profile from the profile generating unit, determine a target peak in the differential profile, compare voltages of the determined target peak and a criterion peak of a criterion profile preset for the battery, and judge whether a side reaction occurs in the battery based on the comparison result.

Battery diagnosing apparatus and method

A battery management system includes a sensor to sense voltage and current of a battery, memory to store over-potential management information including reference peak and reference peak voltage values, and a controller to command constant-current charging using a maximum allowable C-rate to a charging circuit when the reference peak value is equal to or larger than a threshold peak value, in response to a charge request, determine a differential capacity curve indicating a correlation between the voltage and differential capacity of the battery within a range based on the sensed voltage and current during the charging, determine main peak and main peak voltage values indicating differential capacity and voltage of a peak of the differential capacity curve, respectively, and update the reference peak and reference peak voltage values to equal the main peak and main peak voltage values, when the main peak value is less than the threshold peak value.

Battery management system, battery management method, battery pack, and electric vehicle

A battery management system includes a voltage sensor to generate a voltage signal indicating a voltage of a battery, a current sensor to generate a current signal indicating a current flowing through the battery, and a control unit to record a voltage history and a current history of the battery based on the voltage signal and the current signal at a predetermined time interval during constant current charging of the battery. The control unit determines a differential capacity curve indicating a correlation between the voltage of the battery and a differential capacity in a reference voltage range. The control unit performs a first protection operation for the battery by comparing a first characteristic voltage of a main feature point with a reference voltage when the main feature point is detected from the differential capacity curve.

Battery management system, battery management method, battery pack and electric vehicle

A battery classification apparatus includes a profile generating unit configured to obtain battery information about capacity and voltage of a battery and generate a differential profile representing a corresponding relationship between the capacity and a differential voltage based on the capacity and the voltage, and a control unit configured to obtain the differential profile from the profile generating unit, detect a plurality of peaks in the obtained differential profile, and classify the battery into any one of a plurality of preset groups based on a plurality of classification conditions preset for the number of the plurality of detected peaks and the differential voltage.

Battery classification apparatus and method

A battery management apparatus for changing a control condition according to a degradation pattern in a charge situation of a battery cell. Since not only the degradation degree of the battery cell but also the degradation acceleration degree of the battery cell is estimated, the present degradation state of the battery cell may be more accurately estimated, and the future degradation state of the battery cell may also be predicted more accurately.

Battery management apparatus

A battery management apparatus includes a measuring unit configured to measure a first voltage of a battery cell at a first time point and measure a second voltage and a second capacity of the battery cell at a second time point later than the first time point, and a control unit configured to calculate a voltage deviation between the first voltage and the second voltage, calculate a capacity deviation between a first capacity corresponding to the first voltage and the second capacity, determine a positive electrode side reaction factor and a negative electrode side reaction factor for the battery cell based on the voltage deviation and the capacity deviation, and judge the type of a side reaction of the battery cell based on the positive electrode side reaction factor and the negative electrode side reaction factor.

A battery management apparatus includes an EIS unit configured to output an AC current to a battery at a plurality of times and generate an EIS profile representing a resistance of the battery as a corresponding relationship between a real part and an imaginary part at each of the plurality of times, and a control unit configured to obtain the plurality of EIS profiles for the battery generated by the EIS unit, determine a plurality of arcs in each of the plurality of EIS profiles, calculate an arc resistance value for each of the plurality of determined arcs, calculate a resistance change rate for the arc resistance value between corresponding arcs among the plurality of arcs, and determine each of the plurality of arcs as a negative electrode-originated arc or a positive electrode-originated arc based on the plurality of calculated resistance change rates and a preset criterion change rate.

A battery management apparatus, battery management method and battery pack that detects feature points of each of a first differential capacity curve acquired by charging the battery with a first constant current, a second differential capacity curve acquired by discharging the battery with the first constant current, a third differential capacity curve acquired by charging the battery with a second constant current and a fourth differential capacity curve acquired by discharging the battery with the second constant current, and determines degradation information of the battery based on voltage values of the feature points detected from each differential capacity curve.

Battery management apparatus, battery management method, battery pack and electric vehicle

A battery diagnosing apparatus includes a measuring unit configured to measure voltage and temperature of a battery, an ohmic resistance determining unit configured to determine an ohmic resistance of the battery based on an impedance profile generated for the battery, and a control unit configured to calculate a voltage change amount by comparing the voltage of the battery measured by the measuring unit with a reference voltage, calculate a resistance change rate by comparing the ohmic resistance determined by the ohmic resistance determining unit with a reference resistance, judge an internal gas generation level of the battery by comparing magnitudes of the calculated resistance change rate and a criterion resistance change rate, and judge an internal gas generation cause of the battery by comparing magnitudes of the calculated voltage change amount and a criterion voltage change amount.

A battery diagnosing apparatus includes a measuring unit configured to measure discharge capacity and temperature of a battery, an ohmic resistance determining unit configured to determine an ohmic resistance of the battery based on an impedance profile generated for the battery, and a control unit configured to calculate a capacity change rate by comparing the discharge capacity of the battery measured by the measuring unit with a reference capacity, calculate a resistance change rate by comparing the ohmic resistance determined by the ohmic resistance determining unit with a reference resistance, judge an internal gas generation level of the battery by comparing magnitudes of the calculated resistance change rate and a criterion resistance change rate, and judge an internal gas generation cause of the battery by comparing magnitudes of the calculated capacity change rate and a criterion capacity change rate.

A battery management apparatus for providing more specific information about degradation of a battery cell and changing a control condition according to a degradation pattern of the battery cell. Since not only the degradation degree of the battery cell but also the degradation pattern of the battery cell is estimated, the present state of the battery cell may be more accurately estimated.

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Daejeon, South Korea

A-Ming Cha