Battery diagnosis device and operation method thereof

Abstract

According to one embodiment disclosed in the present document, a battery diagnosis device may comprise: a pulse application unit for applying a plurality of pulses to a battery; and a controller for acquiring a first voltage corresponding to at least one of the plurality of pulses, calculating a voltage change rate on the basis of the first voltage and the time at which the first voltage is acquired, and diagnosing an anomaly of the battery on the basis of the voltage change rate.

Description

Battery diagnostic device and its operating method

[0001] Cross-citation with related applications

[0002] This invention claims the benefit of priority from Korean Patent Application No. 10-2023-0105935, filed August 11, 2023, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The embodiments disclosed in this document relate to a battery diagnostic device and an operating method thereof.

[0005] Recently, research and development on secondary batteries has been actively conducted. Here, secondary batteries are rechargeable and include both conventional Ni / Cd and Ni / MH batteries, as well as recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of having a much higher energy density than conventional Ni / Cd and Ni / MH batteries. Furthermore, lithium-ion batteries can be manufactured in a compact and lightweight form, making them suitable for use as power sources for mobile devices. Recently, their use has expanded to include power sources for electric vehicles, attracting attention as a next-generation energy storage medium.

[0006] Batteries are controlled to ensure normal operation by measuring and assessing their condition through the Battery Management System (BMS) embedded within the battery. Therefore, various diagnostic methods exist for cases where the information measured by the BMS exceeds the normal range or exhibits abnormalities. However, battery behavior can vary widely with respect to temperature, State of Charge (SOC), and State of Health (SOH), making accurate diagnosis of abnormalities a challenging task.

[0007] One purpose of the embodiments disclosed in this document is to provide a battery diagnostic device capable of precisely diagnosing a battery and an operating method thereof.

[0008] One purpose of the embodiments disclosed in this document is to provide a battery diagnostic device and an operating method thereof capable of diagnosing a battery based on a response by applying a pulse to the battery.

[0009] The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the descriptions below.

[0010] A battery diagnostic device according to one embodiment disclosed in this document may include a pulse application unit that applies a plurality of pulses to a battery, and a controller that obtains a first voltage corresponding to at least one pulse among the plurality of pulses, calculates a voltage change rate based on the first voltage and the time at which the first voltage is obtained, and diagnoses an abnormality of the battery based on the voltage change rate.

[0011] In one embodiment, the pulse applying unit can apply at least one of a charge pulse and a discharge pulse to the battery.

[0012] In one embodiment, the pulse applying unit can alternately apply the charge pulse, pause, and discharge pulse to the battery.

[0013] In one embodiment, the controller can obtain a voltage corresponding to a discharge pulse among the plurality of pulses as the first voltage.

[0014] In one embodiment, the controller can calculate an average voltage as an average of the first voltages corresponding to the at least one pulse, and diagnose an abnormality of the battery based on a rate of change of the average voltage.

[0015] In one embodiment, the controller can calculate an average voltage as an average of the first voltages corresponding to each of the plurality of pulses, and diagnose an abnormality of the battery based on a rate of change of the average voltage.

[0016] In one embodiment, the controller may convert the time axis of the first voltage to a logarithmic scale and calculate the voltage change rate as the change rate of the first voltage with respect to the time axis converted to the logarithmic scale.

[0017] In one embodiment, the controller can calculate the rate of change of the voltage by calculating the logarithmic scale time derivative of the first voltage (dV / d(log(t)).

[0018] In one embodiment, the controller can diagnose an abnormality of the battery based on at least one of a rate of change of a derivative of the first voltage with respect to a logarithmic scale time, a peak value of a derivative of the first voltage with respect to a logarithmic scale time, a maximum value of a derivative of the first voltage with respect to a logarithmic scale time, a minimum value of a derivative of the first voltage with respect to a logarithmic scale time, and a normal distribution of a derivative of the first voltage with respect to a logarithmic scale time.

[0019] In one embodiment, the controller can obtain the first voltage based on a voltage after a set time after application of a discharge pulse among the plurality of pulses.

[0020] In one embodiment, the controller can fit the first voltage to a formula and calculate the voltage change rate based on the formula.

[0021] In one embodiment, the controller can diagnose an abnormality in each of the plurality of battery cells included in the battery when each of the plurality of battery cells has the same degree of degradation.

[0022] In one embodiment, the controller may extract the first voltage by compensating for a temperature imbalance of the battery.

[0023] An operating method of a battery diagnosis device according to one embodiment disclosed in this document may include an operation of applying a plurality of pulses to a battery, an operation of obtaining a first voltage corresponding to at least one pulse among the plurality of pulses, an operation of calculating a voltage change rate based on the first voltage and the time at which the first voltage was obtained, and an operation of diagnosing an abnormality of the battery based on the voltage change rate.

[0024] In one embodiment, the operation of applying multiple pulses to the battery may alternately apply the charge pulse, the pause pulse, and the discharge pulse to the battery.

[0025] In one embodiment, the operation of obtaining a first voltage corresponding to at least one pulse among the plurality of pulses may calculate an average voltage as an average of the first voltages corresponding to the at least one pulse.

[0026] In one embodiment, the operation of obtaining a first voltage corresponding to at least one pulse among the plurality of pulses may calculate an average voltage as an average of the first voltages corresponding to each of the plurality of pulses.

[0027] In one embodiment, the operation of calculating the voltage change rate based on the first voltage and the time at which the first voltage was acquired may include the operation of converting the time axis of the first voltage to a logarithmic scale and calculating the voltage change rate as the change rate of the first voltage with respect to the time axis converted to the logarithmic scale.

[0028] In one embodiment, the operation of calculating the rate of change of the voltage as the rate of change of the first voltage with respect to the time axis converted to the log scale may calculate the differential value with respect to the log scale time of the first voltage (dV / d(log(t)).

[0029] In one embodiment, the operation of diagnosing an abnormality of the battery based on the voltage change rate may diagnose an abnormality of the battery based on at least one of a change rate of a differential value with respect to a logarithmic scale time of the first voltage, a peak value of a differential value with respect to a logarithmic scale time of the first voltage, a maximum value of a differential value with respect to a logarithmic scale time of the first voltage, a minimum value of a differential value with respect to a logarithmic scale time of the first voltage, and a normal distribution of a differential value with respect to a logarithmic scale time of the first voltage.

[0030] A battery diagnostic device and its operating method according to one embodiment disclosed in this document can precisely diagnose a battery.

[0031] A battery diagnostic device and its operating method according to one embodiment disclosed in this document can precisely diagnose a battery by creating a standardized situation for the battery and analyzing differences in the situation.

[0032] A battery diagnosis device and its operating method according to one embodiment disclosed in this document can apply a pulse to a battery and diagnose the battery based on the amount of change in voltage response to the pulse.

[0033] In addition, various effects may be provided, either directly or indirectly, through this document.

[0034] FIG. 1 is a block diagram showing a battery diagnostic device according to one embodiment disclosed in this document.

[0035] FIG. 2 is a drawing showing an example of a battery diagnostic device applying a pulse according to one embodiment disclosed in this document.

[0036] FIG. 3 is a diagram showing an example of a battery diagnostic device according to one embodiment disclosed in this document obtaining a response to a pulse.

[0037] FIG. 4 is a drawing showing an operation method of a battery diagnostic device according to one embodiment disclosed in this document.

[0038] FIG. 5 is a flowchart specifically showing an operation method of a battery diagnostic device according to one embodiment disclosed in this document.

[0039] FIG. 6 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a battery diagnostic device according to one embodiment disclosed in this document.

[0040] Hereinafter, embodiments disclosed in this document will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components are given the same reference numerals, even if they appear in different drawings. Furthermore, when describing embodiments disclosed in this document, detailed descriptions of related known structures or functions will be omitted if they are deemed to hinder understanding of the embodiments disclosed in this document.

[0041] In describing the components of the embodiments disclosed in this document, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components and do not limit the nature, order, or sequence of the components. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed in this document belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0042] FIG. 1 is a drawing showing a battery diagnostic device according to one embodiment disclosed in this document.

[0043] Referring to FIG. 1, a battery diagnostic device (100) according to one embodiment disclosed in this document may include a pulse application unit (110) and a controller (120).

[0044] According to an embodiment, the battery diagnostic device (100) may be included in a battery management system (BMS) of a battery, or may be included in a server, cloud server, etc. According to another embodiment, the battery diagnostic device (100) may be included in a device for charge and discharge testing, such as a charge and discharge cycler, or may be included in various devices for diagnosing or testing a battery.

[0045] The pulse application unit (110) can apply multiple pulses to the battery. For example, the pulse application unit (110) can apply at least one of a charging pulse and a discharging pulse to the battery. As another example, the pulse application unit (110) can alternately apply charging pulses and discharging pulses to the battery.

[0046] According to an embodiment, the pulse application unit (110) may alternately apply charge pulses and discharge pulses to the battery without setting a rest period between the charge pulses and discharge pulses. According to another embodiment, the pulse application unit (110) may alternately apply charge pulses and discharge pulses to the battery while setting a rest period between the charge pulses and discharge pulses.

[0047] According to an embodiment, the pulse application unit (110) can continuously apply a charging pulse to the battery. For example, the pulse application unit (110) can continuously apply a charging pulse for a set period of time by applying a charging pulse to the battery, setting a pause period, and then applying a charging pulse again.

[0048] According to an embodiment, the pulse application unit (110) can continuously apply a discharge pulse to the battery. For example, the pulse application unit (110) can continuously apply a discharge pulse for a set period of time by applying a discharge pulse to the battery, setting a pause period, and then applying a discharge pulse again.

[0049] According to an embodiment, the pulse application unit (110) can alternately apply a charging pulse, a pause, and a discharge pulse set to a certain condition to the battery. For example, the pulse application unit (110) can apply a pulse to the battery by applying a charging pulse for 0.1 seconds, then applying a discharge pulse for 0.1 seconds with a pause of 0.1 seconds, and repeating the above process. However, the present invention is not limited thereto, and the pulse application unit (110) can apply a pulse to the battery by determining the application time of the charging pulse, whether to apply the charging pulse, whether to pause, the pause time, the application time of the discharge pulse, and whether to apply the discharge pulse.

[0050] According to an embodiment, the pulse application unit (110) can alternately apply charging pulses and discharging pulses multiple times. For example, the pulse application unit (110) can alternately apply charging pulses and discharging pulses 3 to 10 times. However, the present invention is not limited thereto, and the pulse application unit (110) can alternately apply charging pulses and discharging pulses n times (n is a natural number).

[0051] According to an embodiment, the pulse application unit (110) can apply a charge pulse and a discharge pulse as current.

[0052] FIG. 2 is a drawing showing an example of a battery diagnostic device applying a pulse according to one embodiment disclosed in this document.

[0053] Referring to FIG. 2, the pulse application unit (110) of the battery diagnostic device (100) can apply pulses to the battery. FIG. 2 illustrates an example in which the pulse application unit (110) alternately applies charge pulses and discharge pulses, but is not limited thereto.

[0054] According to an embodiment, the pulse application unit (110) can apply various pulses to the battery, such as repetition of a charge pulse and a discharge pulse, repetition of a charge pulse and a pause, repetition of a discharge pulse and a pause, or repetition of a charge pulse and a pause and a discharge pulse.

[0055] Referring back to FIG. 1, the controller (120) can obtain a first voltage corresponding to at least one pulse among the plurality of pulses. For example, the controller (120) can obtain a voltage corresponding to a discharge pulse among the plurality of pulses as the first voltage. As another example, the controller (120) can obtain a first voltage corresponding to one or all of the plurality of pulses. As yet another example, the controller (120) can obtain a voltage response for each of the plurality of pulses, and obtain all or part of the obtained voltage response as the first voltage.

[0056] According to an embodiment, the controller (120) may calculate the average voltage as an average of the first voltages corresponding to at least one pulse. For example, the controller (120) may extract at least one pulse from among a plurality of pulses based on a criterion, and may calculate the average voltage as an average of the first voltages corresponding to at least one extracted pulse. As another example, the controller (120) may calculate the average voltage as an average of the first voltages corresponding to all or part of the pulses, respectively, for the plurality of pulses. According to an embodiment, the controller (120) may calculate the average voltage by calculating the average of the first voltages corresponding to pulses with less noise from among the plurality of pulses. In this case, the controller (120) may diagnose an abnormality in the battery based on the rate of change of the average voltage.

[0057] According to an embodiment, the controller (120) can calculate an average voltage as an average of the first voltages corresponding to each of the plurality of pulses. In this case, the controller (120) can diagnose an abnormality in the battery based on the rate of change of the average voltage.

[0058] According to an embodiment, when the charge pulse and the discharge pulse are repeated five times, the controller (120) can obtain five first voltages as voltage responses corresponding to the five discharge pulses, and can calculate an average voltage as an average of all or part of the five first voltages. That is, the controller (120) can obtain a first voltage corresponding to one pulse or multiple pulses, and can diagnose the battery based on the obtained first voltage.

[0059] The controller (120) can calculate the voltage change rate based on the first voltage and the time at which the first voltage was acquired. For example, the controller (120) can calculate the hourly change rate of the first voltage. As another example, the controller (120) can calculate d(first voltage) / dt.

[0060] The controller (120) can diagnose a battery abnormality based on the voltage change rate. For example, the controller (120) can diagnose a battery abnormality based on the voltage change rate, peak value, maximum value, minimum value, normal distribution, etc. According to an embodiment, the controller (120) can diagnose a battery abnormality by comparing and analyzing the voltage change rate of the battery with the voltage change rates of other batteries.

[0061] In an embodiment, the controller (120) may diagnose a battery with a voltage change rate slope higher than other batteries, or a battery with a voltage change rate slope higher than a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery with a voltage change rate slope higher than a threshold value as an abnormal battery.

[0062] In an embodiment, the controller (120) may diagnose a battery with a peak voltage change rate higher than other batteries, or a battery with a peak voltage change rate higher than a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery with a peak voltage change rate higher than a threshold value as an abnormal battery.

[0063] In an embodiment, the controller (120) may diagnose a battery whose minimum or maximum voltage change rate is higher than that of other batteries, or a battery whose minimum or maximum voltage change rate is higher than that of a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery whose minimum or maximum voltage change rate is higher than a threshold value as an abnormal battery.

[0064] In an embodiment, the controller (120) may calculate a normal distribution of voltage change rates and diagnose a battery that differs from other batteries or normal batteries as an abnormal battery. As another example, the controller (120) may calculate a normal distribution of voltage change rates and diagnose a battery that differs by a threshold value or more from a normal battery as an abnormal battery.

[0065] According to an embodiment, the controller (120) can convert the time axis of the first voltage into a logarithmic scale, and calculate the voltage change rate as the change rate of the first voltage with respect to the time axis converted into a logarithmic scale. For example, the controller (120) can calculate the voltage change rate by calculating the differential value of the first voltage with respect to the logarithmic scale time as d(first voltage) / d(log(t)).

[0066] According to an embodiment, the controller (120) can diagnose an abnormality of the battery based on at least one of a rate of change of a derivative of the first voltage with respect to a logarithmic scale time, a peak value of the first voltage with respect to a logarithmic scale time, a maximum value of the first voltage with respect to a logarithmic scale time, a minimum value of the first voltage with respect to a logarithmic scale time, and a normal distribution of the first voltage with respect to a logarithmic scale time. For example, the controller (120) can diagnose whether the battery is abnormal by comparing and analyzing a diagnostic factor based on the logarithmic scale time of the first voltage with diagnostic factors of other batteries.

[0067] In an embodiment, the controller (120) may diagnose a battery in which the rate of change in the derivative of the first voltage with respect to the logarithmic scale time is higher than that of other batteries, or a battery in which the rate of change is higher than that of a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery in which the rate of change in the derivative of the first voltage with respect to the logarithmic scale time is higher than a threshold value as an abnormal battery.

[0068] In an embodiment, the controller (120) may diagnose a battery in which the peak value of the derivative of the first voltage with respect to the logarithmic scale time is higher than that of other batteries, or a battery in which the peak value is higher than that of a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery in which the peak value of the derivative of the first voltage with respect to the logarithmic scale time is higher than a threshold value as an abnormal battery.

[0069] In an embodiment, the controller (120) may diagnose a battery in which the minimum or maximum value of the derivative of the first voltage with respect to the logarithmic scale time is higher than other batteries, or a battery in which the minimum or maximum value of the derivative of the first voltage with respect to the logarithmic scale time is higher than a threshold value, as an abnormal battery. As another example, the controller (120) may diagnose a battery in which the minimum or maximum value of the derivative of the first voltage with respect to the logarithmic scale time is higher than a threshold value, as an abnormal battery.

[0070] In an embodiment, the controller (120) may calculate a normal distribution of the derivative of the first voltage over a logarithmic time scale and diagnose a battery that differs from other batteries or normal batteries as an abnormal battery. In another example, the controller (120) may calculate a normal distribution of the derivative of the first voltage over a logarithmic time scale and diagnose a battery that differs by a threshold value or more from a normal battery as an abnormal battery.

[0071] According to an embodiment, the controller (120) may have the advantage of processing the first voltage in a logarithmic scale, thereby facilitating trend identification, increasing the discrimination power of the obtained values, and enabling processing of exponential components in a linear format.

[0072] FIG. 3 is a diagram showing an example of a battery diagnostic device according to one embodiment disclosed in this document obtaining a response to a pulse.

[0073] Referring to FIG. 3, the controller (120) of the battery diagnostic device (100) according to one embodiment disclosed in the present document can apply a pulse to the battery and calculate the voltage change rate of the first voltage obtained in response thereto.

[0074] Although FIG. 3 illustrates the derivative of the first voltage with respect to the logarithmic scale time, the present invention is not limited thereto, and the controller (120) of the battery diagnostic device (100) according to one embodiment disclosed in this document can calculate the voltage change rate of the first voltage, process noise of the first voltage and calculate the voltage change rate, calculate an average of a plurality of first voltages, and calculate the change rate of the average voltage.

[0075] The controller (120) can diagnose a battery abnormality based on the calculated voltage change rate. For example, the controller (120) can diagnose a battery abnormality based on the peak value of the voltage change rate.

[0076] Referring back to FIG. 1, the controller (120) can obtain the first voltage based on the voltage after a set time period following the application of a discharge pulse among multiple pulses. For example, the set time period may be a time period corresponding to current stabilization. In another example, the controller (120) can obtain the first voltage based on the voltage after a rising time or a falling time.

[0077] According to an embodiment, the controller (120) can fit the first voltage to a formula and calculate the voltage change rate based on the formula. For example, the formula can include various formulas such as a polynomial, an exponential, etc.

[0078] According to an embodiment, the controller (120) can diagnose an abnormality in each of the plurality of battery cells when each of the plurality of battery cells included in the battery has the same degree of degradation.

[0079] According to an embodiment, the controller (120) can obtain the first voltage by compensating for a temperature imbalance of the battery. For example, when a charge pulse or discharge pulse is applied to the battery, the temperature of the battery may rise, causing different behaviors to appear. Therefore, the first voltage can be obtained by compensating for the temperature-dependent behaviors.

[0080] A battery diagnostic device (100) according to one embodiment disclosed in this document can precisely diagnose a battery.

[0081] A battery diagnostic device (100) according to one embodiment disclosed in this document can precisely diagnose a battery by creating a standardized situation for the battery and analyzing differences in the situation.

[0082] A battery diagnostic device (100) according to one embodiment disclosed in this document can apply a pulse to a battery and diagnose the battery based on the amount of change in voltage response to the pulse.

[0083] FIG. 4 is a diagram illustrating an operating method of a battery diagnostic device according to one embodiment disclosed in this document. According to the embodiment, the operations illustrated in FIG. 4 may be performed through the battery diagnostic device (100) of FIG. 1.

[0084] Referring to FIG. 4, in operation 410, the pulse application unit (110) may apply multiple pulses to the battery. For example, the pulse application unit (110) may apply at least one of a charging pulse and a discharging pulse to the battery. As another example, the pulse application unit (110) may alternately apply charging pulses and discharging pulses to the battery.

[0085] According to an embodiment, the pulse application unit (110) may alternately apply charge pulses and discharge pulses to the battery without setting a rest period between the charge pulses and discharge pulses. According to another embodiment, the pulse application unit (110) may alternately apply charge pulses and discharge pulses to the battery while setting a rest period between the charge pulses and discharge pulses.

[0086] According to an embodiment, the pulse application unit (110) can continuously apply a charging pulse to the battery. For example, the pulse application unit (110) can continuously apply a charging pulse for a set period of time by applying a charging pulse to the battery, setting a pause period, and then applying a charging pulse again.

[0087] According to an embodiment, the pulse application unit (110) can continuously apply a discharge pulse to the battery. For example, the pulse application unit (110) can continuously apply a discharge pulse for a set period of time by applying a discharge pulse to the battery, setting a pause period, and then applying a discharge pulse again.

[0088] According to an embodiment, the pulse application unit (110) can alternately apply charging pulses and discharging pulses multiple times. For example, the pulse application unit (110) can alternately apply charging pulses and discharging pulses 3 to 10 times. However, the present invention is not limited thereto, and the pulse application unit (110) can alternately apply charging pulses and discharging pulses n times (n is a natural number).

[0089] In operation 420, the controller (120) may acquire a first voltage corresponding to at least one pulse among the plurality of pulses. For example, the controller (120) may acquire a voltage corresponding to a discharge pulse among the plurality of pulses as the first voltage. As another example, the controller (120) may acquire a first voltage corresponding to one or all of the plurality of pulses. As yet another example, the controller (120) may acquire a voltage response for each of the plurality of pulses, and may acquire all or part of the acquired voltage response as the first voltage.

[0090] According to an embodiment, the controller (120) may calculate the average voltage as an average of the first voltages corresponding to at least one pulse. For example, the controller (120) may extract at least one pulse from among a plurality of pulses based on a criterion, and may calculate the average voltage as an average of the first voltages corresponding to at least one extracted pulse. As another example, the controller (120) may calculate the average voltage as an average of the first voltages corresponding to all or part of the pulses, respectively, for the plurality of pulses. According to an embodiment, the controller (120) may calculate the average voltage by calculating the average of the first voltages corresponding to pulses with less noise from among the plurality of pulses. In this case, the controller (120) may diagnose an abnormality in the battery based on the rate of change of the average voltage.

[0091] According to an embodiment, the controller (120) can calculate an average voltage as an average of the first voltages corresponding to each of the plurality of pulses. In this case, the controller (120) can diagnose an abnormality in the battery based on the rate of change of the average voltage.

[0092] In operation 430, the controller (120) can calculate a voltage change rate based on the first voltage and the time at which the first voltage was acquired. For example, the controller (120) can calculate the hourly change rate of the first voltage. As another example, the controller (120) can calculate d(first voltage) / dt.

[0093] In operation 440, the controller (120) can diagnose a battery abnormality based on the voltage change rate. For example, the controller (120) can diagnose a battery abnormality based on the voltage change rate, peak value, maximum value, minimum value, normal distribution, etc. According to an embodiment, the controller (120) can diagnose a battery abnormality by comparing and analyzing the voltage change rate of the battery with the voltage change rates of other batteries.

[0094] In an embodiment, the controller (120) may diagnose a battery with a voltage change rate slope higher than other batteries, or a battery with a voltage change rate slope higher than a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery with a voltage change rate slope higher than a threshold value as an abnormal battery.

[0095] In an embodiment, the controller (120) may diagnose a battery with a peak voltage change rate higher than other batteries, or a battery with a peak voltage change rate higher than a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery with a peak voltage change rate higher than a threshold value as an abnormal battery.

[0096] In an embodiment, the controller (120) may diagnose a battery whose minimum or maximum voltage change rate is higher than that of other batteries, or a battery whose minimum or maximum voltage change rate is higher than that of a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery whose minimum or maximum voltage change rate is higher than a threshold value as an abnormal battery.

[0097] In an embodiment, the controller (120) may calculate a normal distribution of voltage change rates and diagnose a battery that differs from other batteries or normal batteries as an abnormal battery. As another example, the controller (120) may calculate a normal distribution of voltage change rates and diagnose a battery that differs by a threshold value or more from a normal battery as an abnormal battery.

[0098] FIG. 5 is a flowchart specifically illustrating an operating method of a battery diagnostic device according to one embodiment disclosed in this document. According to the embodiment, the operations illustrated in FIG. 5 may be performed through the battery diagnostic device (100) of FIG. 1.

[0099] Referring to FIG. 5, in operation 510, the controller (120) can convert the time axis of the first voltage to a logarithmic scale.

[0100] In operation 520, the controller (120) can calculate the voltage change rate as the rate of change of the first voltage with respect to the time axis converted to a log scale. For example, the controller (120) can calculate the voltage change rate by calculating the differential value of the first voltage with respect to the log scale time as d(first voltage) / d(log(t)).

[0101] According to an embodiment, operations 510 and 520 may be performed as included in operation 430 of FIG. 4.

[0102] In this case, the controller (120) can diagnose an abnormality of the battery based on at least one of a change rate of a differential value with respect to the log scale time of the first voltage, a peak value with respect to the log scale time of the first voltage, a maximum value with respect to the log scale time of the first voltage, a minimum value with respect to the log scale time of the first voltage, and a normal distribution with respect to the log scale time of the first voltage. For example, the controller (120) can diagnose whether the battery is abnormal by comparing and analyzing a diagnostic factor based on the log scale time of the first voltage with the diagnostic factors of another battery.

[0103] In an embodiment, the controller (120) may diagnose a battery in which the rate of change in the derivative of the first voltage with respect to the logarithmic scale time is higher than that of other batteries, or a battery in which the rate of change is higher than that of a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery in which the rate of change in the derivative of the first voltage with respect to the logarithmic scale time is higher than a threshold value as an abnormal battery.

[0104] In an embodiment, the controller (120) may diagnose a battery in which the peak value of the derivative of the first voltage with respect to the logarithmic scale time is higher than that of other batteries, or a battery in which the peak value is higher than that of a normal battery, as an abnormal battery. As another example, the controller (120) may diagnose a battery in which the peak value of the derivative of the first voltage with respect to the logarithmic scale time is higher than a threshold value as an abnormal battery.

[0105] In an embodiment, the controller (120) may diagnose a battery in which the minimum or maximum value of the derivative of the first voltage with respect to the logarithmic scale time is higher than other batteries, or a battery in which the minimum or maximum value of the derivative of the first voltage with respect to the logarithmic scale time is higher than a threshold value, as an abnormal battery. As another example, the controller (120) may diagnose a battery in which the minimum or maximum value of the derivative of the first voltage with respect to the logarithmic scale time is higher than a threshold value, as an abnormal battery.

[0106] In an embodiment, the controller (120) may calculate a normal distribution of the derivative of the first voltage over a logarithmic time scale and diagnose a battery that differs from other batteries or normal batteries as an abnormal battery. In another example, the controller (120) may calculate a normal distribution of the derivative of the first voltage over a logarithmic time scale and diagnose a battery that differs by a threshold value or more from a normal battery as an abnormal battery.

[0107] FIG. 6 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a battery diagnostic device according to one embodiment disclosed in this document.

[0108] Referring to FIG. 6, a computing system (1000) according to one embodiment disclosed in the present document may include an MCU (1010), a memory (1020), an input / output I / F (1030), and a communication I / F (1040).

[0109] The MCU (1010) may be a processor that executes various programs (e.g., pulse generation program, voltage extraction program, voltage change rate calculation program, etc.) stored in the memory (1020), processes various information including battery voltage, battery voltage change rate, and battery abnormality through these programs, and performs the functions of the controller included in the battery diagnosis device shown in the aforementioned FIG. 1.

[0110] The memory (1020) can store various programs, such as a pulse generation program, a voltage extraction program, and a voltage change rate calculation program. In addition, the memory (1020) can store various information, including battery voltage, battery voltage change rate, and whether the battery is abnormal.

[0111] Such memories (1020) may be provided in multiple numbers as needed. The memories (1020) may be volatile memories or non-volatile memories. As volatile memories (1020), RAM, DRAM, SRAM, etc. may be used. As non-volatile memories (1020), ROM, PROM, EAROM, EPROM, EEPROM, flash memories, etc. may be used. The examples of the memories (1020) listed above are merely examples and are not limited to these examples.

[0112] The input / output I / F (1030) can provide an interface that enables data transmission and reception between an input device (not shown) such as a keyboard, mouse, or touch panel, and an output device (not shown) such as a display and the MCU (1010).

[0113] The communication I / F (1040) is a component capable of transmitting and receiving various data with the server, and may be any device capable of supporting wired or wireless communication. For example, a battery diagnostic device can transmit and receive various information, including battery voltage, battery voltage change rate, and battery abnormality, from a separately provided external server via the communication I / F (1040).

[0114] In this way, a computer program according to one embodiment disclosed in this document may be implemented as a module that is recorded in a memory (1020) and processed by an MCU (1010) to perform each function illustrated in FIG. 1, for example.

[0115] The above description is merely an example of the technical idea disclosed in this document, and those skilled in the art to which the embodiments disclosed in this document pertain may make various modifications and variations without departing from the essential characteristics of the embodiments disclosed in this document.

[0116] Accordingly, the embodiments disclosed in this document are intended to illustrate, rather than limit, the technical concepts disclosed in this document, and the scope of the technical concepts disclosed in this document is not limited by these embodiments. The scope of protection of the technical concepts disclosed in this document should be interpreted by the claims below, and all technical concepts within the equivalent scope should be interpreted as being included within the scope of the rights of this document.

Claims

1. A pulse application unit that applies multiple pulses to the battery; and Obtaining a first voltage corresponding to at least one pulse among the above multiple pulses, Calculate the voltage change rate based on the first voltage and the time at which the first voltage was acquired, A battery diagnostic device including a controller that diagnoses an abnormality in the battery based on the voltage change rate.

2. In paragraph 1, The above pulse application part is, A battery diagnostic device that applies at least one of a charge pulse and a discharge pulse to the battery.

3. In paragraph 2, The above pulse application part is, A battery diagnostic device which alternately applies the charge pulse, pause, and discharge pulse to the battery.

4. In paragraph 1, The above controller, A battery diagnostic device that obtains a voltage corresponding to a discharge pulse among the plurality of pulses as the first voltage.

5. In paragraph 1, The above controller, An average voltage is calculated as an average of the first voltages corresponding to at least one of the pulses, A battery diagnostic device that diagnoses an abnormality in the battery based on the rate of change of the average voltage.

6. In paragraph 1, The above controller, An average voltage is calculated by averaging the first voltages corresponding to each of the plurality of pulses, A battery diagnostic device that diagnoses an abnormality in the battery based on the rate of change of the average voltage.

7. In paragraph 1, The above controller, Convert the time axis of the above first voltage to a logarithmic scale, A battery diagnostic device that calculates the voltage change rate as the change rate of the first voltage with respect to the time axis converted into the log scale.

8. In paragraph 7, The above controller, A battery diagnostic device that calculates the voltage change rate by calculating the differential value (dV / d(log(t)) with respect to the logarithmic scale time of the first voltage.

9. In paragraph 8, The above controller, A battery diagnostic device that diagnoses an abnormality of the battery based on at least one of a rate of change of a derivative with respect to log-scale time of the first voltage, a peak value of a derivative with respect to log-scale time of the first voltage, a maximum value of a derivative with respect to log-scale time of the first voltage, a minimum value of a derivative with respect to log-scale time of the first voltage, and a normal distribution of a derivative with respect to log-scale time of the first voltage.

10. In paragraph 1, The above controller, A battery diagnostic device that obtains the first voltage based on the voltage after a set time after the discharge pulse is applied among the plurality of pulses.

11. In paragraph 1, The above controller, Fitting the above first voltage to the formula, A battery diagnostic device that calculates the voltage change rate based on the above formula.

12. In paragraph 1, The above controller, A battery management device that diagnoses an abnormality in each of the plurality of battery cells when each of the plurality of battery cells included in the battery has the same degree of degradation.

13. In paragraph 1, The above controller, A battery diagnostic device for extracting the first voltage by compensating for temperature imbalance of the battery.

14. An operation of applying multiple pulses to a battery; An operation of obtaining a first voltage corresponding to at least one pulse among the plurality of pulses; An operation for calculating a voltage change rate based on the first voltage and the time at which the first voltage was acquired; and An operating method of a battery diagnosis device, comprising: an operation of diagnosing an abnormality of the battery based on the voltage change rate.

15. In paragraph 14, The operation of applying multiple pulses to the above battery is: An operating method of a battery diagnostic device, wherein charging pulses and discharging pulses are alternately applied to the battery.

16. In paragraph 14, An operation of obtaining a first voltage corresponding to at least one pulse among the above plurality of pulses is: A method of operating a battery diagnostic device, wherein an average voltage is calculated as an average of the first voltages corresponding to at least one of the pulses.

17. In paragraph 14, An operation of obtaining a first voltage corresponding to at least one pulse among the above plurality of pulses is: An operating method of a battery diagnostic device, wherein an average voltage is calculated as an average of the first voltages corresponding to each of the plurality of pulses.

18. In paragraph 14, The operation of calculating the voltage change rate based on the first voltage and the time at which the first voltage was acquired is as follows: An operation of converting the time axis of the first voltage to a logarithmic scale; and An operating method of a battery diagnostic device, comprising: an operation of calculating the voltage change rate as a change rate of the first voltage with respect to a time axis converted into the logarithmic scale; 19. In paragraph 18, The operation of calculating the voltage change rate as the change rate of the first voltage with respect to the time axis converted to the log scale is as follows. A method of operating a battery diagnostic device, wherein the method comprises calculating a derivative (dV / d(log(t)) with respect to logarithmic scale time of the first voltage.

20. In paragraph 19, The operation of diagnosing an abnormality in the battery based on the above voltage change rate is as follows: A method for operating a battery diagnosis device, wherein an abnormality of the battery is diagnosed based on at least one of a rate of change of a derivative with respect to logarithmic scale time of the first voltage, a peak value of a derivative with respect to logarithmic scale time of the first voltage, a maximum value of a derivative with respect to logarithmic scale time of the first voltage, a minimum value of a derivative with respect to logarithmic scale time of the first voltage, and a normal distribution of a derivative with respect to logarithmic scale time of the first voltage.

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