Apparatus and method for compensating OCV of battery

Abstract

An apparatus and method for compensating an open circuit voltage (OCV) of a battery are disclosed. The apparatus for compensating an open circuit voltage of a battery according to the present disclosure comprises: a voltage sensor configured to detect a voltage of a battery cell; and a processor configured to extract a voltage value of a peak value and a state of charge (SOC) value within a preset voltage portion of each preset setting cycle based on a voltage value of the battery cell detected by the voltage sensor each time the preset setting cycle has elapsed, and compensate the OCV using the SOC value of each peak value and a voltage change amount of the peak value.

Description

Technical Field

[0001] Aspects of embodiments of the present disclosure are directed to an apparatus and method for compensating for an open circuit voltage (OCV) of a battery. Background Art

[0002] The battery management system (BMS) is equipped with an algorithm for estimating the battery state. The algorithm estimates the internal state of the battery using information that can be measured outside the battery (voltage, current, temperature, etc.). In addition, the algorithm is extended to various component technologies (capacity estimation, fast charging, diagnostic functions, etc.) that utilize the estimated information.

[0003] The algorithm uses various component technologies to provide more accurate information to users and detect and prevent abnormal phenomena such as battery fire or explosion in advance. To do this, the algorithm must accurately estimate the internal state of the battery even in different or harsh environments, and precise model building and control are required to prevent errors.

[0004] However, the direction or degree of battery aging may vary depending on the usage environment, so the estimation accuracy of the algorithm may decrease. In addition, each time the battery is exposed to a harsh environment, the error in the estimated capacity accumulates, and the error variation of the capacity information reduced due to degradation may also increase over time. As a result, problems such as an increased probability of accidents caused by the battery and a decrease in battery usage efficiency may occur.

[0005] The background art of the present disclosure is disclosed in Korean Patent Registration No. 10-0878123 (January 5, 2009) “Method and system for battery cell state and parameter estimation”. Summary of the invention

[0006] The present invention aims to provide an apparatus and method for compensating an open circuit voltage (OCV) of a battery, which can more simply and accurately compensate the state of charge (SOC) of the OCV according to the aging direction of a battery cell.

[0007] According to aspects of the present invention, there is provided a device for compensating for the open circuit voltage (OCV) of a battery, the device comprising: a voltage sensor configured to detect the voltage of a battery cell, and a processor configured to extract a peak voltage value and a state of charge (SOC) value within a preset voltage portion of each preset set cycle based on the voltage value of the battery cell detected by the voltage sensor each time a preset set cycle is passed, and the OCV is compensated using the SOC value of each peak and the voltage change of the peak.

[0008] The processor may extract a voltage value and an SOC value of a peak value within the voltage portion when a plateau portion appears in the battery cell.

[0009] The processor may extract a peak value in a voltage portion where a capacity variation amount / voltage variation amount is equal to or greater than a preset reference value by using incremental capacity analysis (ICA) during a constant current charging or discharging process of the battery cell.

[0010] The processor may add the voltage change of the SOC value to the OCV value.

[0011] The processor may extract the voltage change amount function of the SOC value and calculate the voltage change amount of the SOC value using the voltage change amount function.

[0012] The processor may extract the voltage variation function using at least one of constant processing, interpolation / extrapolation, a cutting method, and curve fitting depending on the number of peak values.

[0013] When the number of peak values ​​is one, the processor may process the voltage variation function as a constant.

[0014] When the number of peak values ​​is plural, the processor may extract the voltage variation function by at least one of interpolation / extrapolation, a cutting method, and curve fitting.

[0015] According to another aspect of the present disclosure, a method for compensating the OCV of a battery is provided, the method comprising: extracting, by a processor, a voltage value and an SOC value of a peak value within a preset voltage portion of each cycle based on a voltage value of a battery cell detected by a voltage sensor, and compensating for the OCV using the SOC value of each peak value and the voltage variation of the peak value.

[0016] When extracting the voltage value and the SOC value of the peak value within the preset voltage section of each cycle, the processor may extract the voltage value and the SOC value of the peak value within the voltage section when a plateau section appears in the battery cell.

[0017] When extracting the voltage value and SOC value of the peak value within the preset voltage part of each cycle, the processor can extract the peak value in the voltage part where the capacity change / voltage change is equal to or greater than the preset reference value by utilizing incremental capacity analysis (ICA) during the constant current charging or discharging process of the battery cell.

[0018] In the compensation of OCV, the processor may add the voltage change of the SOC value to the OCV value.

[0019] In the compensation of the OCV, the processor may extract a voltage variation function of the SOC value and calculate a voltage variation of the SOC value using the voltage variation function.

[0020] In the compensation of the OCV, the processor may extract the voltage variation function using at least one of constant processing, interpolation / extrapolation, a cutting method, and curve fitting depending on the number of peaks.

[0021] In the compensation of OCV, when the number of peak values ​​is one, the processor may process the voltage variation function as a constant.

[0022] In the compensation of the OCV, when the number of peaks is plural, the processor may extract the voltage variation function by at least one of interpolation / extrapolation, a cutting method, and curve fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings attached to this specification illustrate embodiments of the present disclosure and, together with the detailed description of the present disclosure, further describe aspects and features of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the drawings:

[0024] Figure 1 is a block diagram of an apparatus for compensating an open circuit voltage (OCV) of a battery according to an embodiment of the present disclosure;

[0025] Figure 2 is a diagram showing a relationship between a voltage of a battery cell and a capacity of the battery cell according to one embodiment of the present disclosure;

[0026] Figure 3 is a view showing a peak excursion in a platform portion according to one embodiment of the present disclosure;

[0027] Figure 4 is a diagram showing voltage variation amounts before and after aging progress according to one embodiment of the present disclosure;

[0028] Figure 5 is a diagram showing a voltage variation function and a compensated OCV for a state of charge (SOC) according to one embodiment of the present disclosure;

[0029] Figure 6 is a diagram showing OCV to which a voltage variation function is applied according to one embodiment of the present disclosure;

[0030] Figure 7 is a view showing an example of extracting a voltage variation amount according to one embodiment of the present disclosure; and

[0031] Figure 8 is a flow chart of a method for compensating for OCV of a battery according to one embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Terms or words used in this specification and claims should not be interpreted as limited to the usual or dictionary meanings, and should be interpreted as meanings and concepts consistent with the technical concept of the present disclosure based on the principle that the inventor can be his / her own lexicon compiler to appropriately define the concept of the terms to best explain his / her invention.

[0033] The embodiments described in this specification and the configurations shown in the accompanying drawings are only some embodiments of the present disclosure and do not represent all technical ideas, aspects and features of the present disclosure. Therefore, it should be understood that there may be various equivalents and modifications that can replace or modify the embodiments described herein when submitting this application.

[0034] It should be understood that when an element or layer is referred to as being "on," "connected to," or "coupled to" another element or layer, it may be directly on, directly connected to, or coupled to the other element or layer, or one or more intermediate elements or layers may also be present. When an element or layer is referred to as being "directly on," "directly connected to," or "directly coupled to" another element or layer, there are no intermediate elements or layers. For example, when a first element is described as being "coupled to" or "connected to" a second element, the first element may be directly coupled to or connected to the second element, or the first element may be indirectly coupled to or connected to the second element via one or more intermediate elements.

[0035] In the accompanying drawings, for clarity, the sizes of various elements, layers, etc. may be exaggerated. The same reference numerals represent the same elements. As used herein, the term "and / or" includes any and all combinations of one or more associated listed items. In addition, when describing the embodiments of the present disclosure, the use of "may" relates to "one or more embodiments of the present disclosure". Expressions such as "at least one of ..." and "any one of ..." modify the entire element list when they are before the element list, without modifying the individual elements in the list. When phrases such as "at least one of A, B and C", "at least one of A, B or C", "at least one of the group selected from A, B and C" or "at least one of A, B and C" are used to specify the list of elements A, B and C, the phrase may refer to any and all suitable combinations or subsets of A, B and C, such as A, B, C, A and B, A and C, B and C, or A and B and C. As used herein, the terms "use," "using," and "used" may be considered synonymous with the terms "utilize," "utilizing," and "utilized," respectively. As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation rather than terms of degree, and are intended to take into account the inherent variations in measured or calculated values ​​that one of ordinary skill in the art would recognize.

[0036] It should be understood that although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teaching of the exemplary embodiment, the first element, component, region, layer or part discussed below can be referred to as a second element, component, region, layer or part.

[0037] For ease of description, spatially relative terms, such as "beneath," "below," "lower," "above," "upper," etc., may be used herein to describe the relationship of one element or feature to another or more elements or features as shown in the figures. It should be understood that the spatially relative terms are intended to cover different orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if the device in the drawings is turned over, elements described as being "below" or "beneath" other elements or features will be oriented as being "above" or "over" the other elements or features. Thus, the term "below" can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0038] The terms used herein are for the purpose of describing the embodiments of the present disclosure and are not intended to limit the present disclosure. As used herein, the singular forms "a" and "an" are intended to also include the plural forms, unless the context clearly states otherwise. It will be further understood that when used in this specification, the terms "includes", "including", "comprises" and / or "comprising" specify the presence of the features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0039] In addition, any numerical range disclosed and / or listed herein is intended to include all sub-ranges of the same numerical precision included in the listed range. For example, the range of "1.0 to 10.0" is intended to include all sub-ranges between the minimum value 1.0 and the maximum value 10.0 (and including endpoints), that is, having a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as, for example, 2.4 to 7.6. Any maximum numerical limit described herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit described in this specification is intended to include all higher numerical limits contained therein. Therefore, the applicant reserves the right to modify this specification (including claims) to explicitly describe any sub-ranges contained in the range explicitly described herein.

[0040] Referring to two compared elements, features, etc. as "the same" may mean that they are "substantially the same." Thus, the phrase "substantially the same" may include situations with what is considered in the art to be low deviations (e.g., 5% or less deviation). In addition, when a parameter is referred to as being uniform in a given area, it may mean that it is uniform in terms of average value.

[0041] Throughout the specification, unless otherwise specified, each element may be in the singular or in the plural.

[0042] When any element is referred to as being disposed (or located or positioned) "on (or below)" or "above (or below)" a component, it may mean that the arbitrary element is placed in contact with the upper (or lower) surface of the component, and may also mean that another component may be interposed between the component and any arbitrary element disposed (or located or positioned) above (or below) the component.

[0043] In addition, it should be understood that when an element is referred to as being "coupled", "linked" or "connected" to another element, the elements may be directly "coupled", "linked" or "connected" to each other, or there may be an intermediate element between them, through which the element may be "coupled", "linked" or "connected" to another element. In addition, when a part is referred to as being "electrically coupled" to another part, the part may be directly connected to the other part, or there may be an intermediate component therebetween, so that the part and the other part are indirectly connected to each other.

[0044] Throughout the specification, unless otherwise specified, when "A and / or B" is stated, it means A, B, or A and B. That is, "and / or" includes any or all combinations of the listed multiple items. When "C to D" is stated, unless otherwise specified, it means C or greater and D or less.

[0045] Hereinafter, an embodiment and method for compensating the open circuit voltage (OCV) of a battery according to an apparatus of the present disclosure will be described in detail with reference to the accompanying drawings. In the process, the thickness of the lines, the size of the elements, etc. shown in the drawings may be exaggerated for the sake of clarity and convenience. In addition, the terms described below may be defined in consideration of the functions in the present disclosure and may be changed according to the customary practice or intention of the user or operator. Therefore, the definitions of these terms should be determined based on the overall content of this specification.

[0046] Figure 1 is a block diagram of an apparatus for compensating for OCV of a battery according to one embodiment of the present disclosure.

[0047] refer to Figure 1, an apparatus for compensating for OCV of a battery according to one embodiment of the present disclosure includes a voltage sensor 200 , a relay 100 , a current sensor 300 , a charge / discharge controller 400 , and a processor 500 .

[0048] The battery 10 may be connected in series with a terminal of an external device (not shown).

[0049] The battery 10 may supply power to an external device or may be charged by receiving power from an external device.

[0050] The external device may be a load of an electric vehicle or a hybrid vehicle, but its type is not particularly limited.

[0051] The battery 10 may include a plurality of battery cells 20 connected in series or in parallel.

[0052] Each of the battery cells 20 may be at least one of a lithium ion battery or a lithium polymer battery.

[0053] The relay 100 regulates the electrical connection between the battery 10 and the external device. That is, the relay 100 can be turned on according to the control signal from the processor 500 to electrically connect the battery 10 and the external device. In this case, the battery 10 can supply power to the external device, or can be charged by receiving power from the external device. Alternatively, the relay 100 can be turned off according to the control signal from the processor 500 to electrically disconnect the battery 10 and the external device.

[0054] The relay 100 may be installed between the positive electrode of the battery 10 and the external device. Alternatively, the relay 100 may be installed between the negative electrode of the battery 10 and the external device. The installation position of the relay 100 is not particularly limited.

[0055] The voltage sensor 200 may be connected to the positive electrode and the negative electrode of the battery cell 20 .

[0056] The voltage sensor 200 may detect the voltage of the battery cell 20 and input the detected voltage into the processor 500 .

[0057] The current sensor 300 may be connected between the negative electrode of the battery cell 20 and an external device.

[0058] The current sensor 300 may detect a current when the battery cell 20 is charged or discharged, and input the detected current into the processor 500 .

[0059] The current sensor 300 may be a Hall current transformer (CT) that measures current using a Hall element and outputs an analog current signal corresponding to the measured current.

[0060] The charge / discharge controller 400 controls charging or discharging of the battery 10 .

[0061] The charge / discharge controller 400 may control the constant current charge or discharge of the battery 10 according to the control signal from the processor 500. The charge / discharge controller 400 may include a plurality of switching elements for constant current charge or discharge of the battery 10, and may control the current flow during charge or discharge according to the switching state of the switching element. The switching element may be a MOSFET, but is not particularly limited.

[0062] The processor 500 may identify the battery cell 20 where the platform portion occurs using the voltage value of each battery cell 20 detected by the voltage sensor 200 .

[0063] In addition, each time a preset setting cycle passes, the processor 500 may extract a voltage value and a state of charge (SOC) value of a peak value within a preset voltage section based on the voltage value of the battery cell 20 where the plateau portion appears.

[0064] The cycle may be a charge cycle or a discharge cycle.

[0065] The processor 500 may compensate for the OCV using the SOC value of each peak value and the voltage variation amount of the peak value.

[0066] More specifically, the processor 500 may control the relay 100 to electrically connect the battery 10 and the external device.

[0067] The processor 500 may control charging and discharging of the battery 10 by controlling the charging / discharging controller 400 .

[0068] In addition, each time a preset setting cycle passes, the processor 500 may determine whether a plateau portion occurs in each battery cell 20 based on the voltage of each battery cell 20 detected by the voltage sensor 200 in the corresponding cycle.

[0069] The setting cycle is a cycle of voltage variation that can sufficiently determine the peak value, which will be described below. The setting cycle is not particularly limited. The peak value will be described below.

[0070] The plateau portion is a portion where the voltage does not change relatively significantly during the charging and discharging process.

[0071] In order to check whether the plateau portion occurs, the processor 500 may first extract the voltage variation of the battery cell 20 during the process of charging and discharging the battery 10 through the charge / discharge controller 400. The processor 500 may determine whether the voltage variation of the corresponding battery cell 20 is less than or equal to a threshold value, and determine that the plateau portion occurs in the corresponding battery cell 20 when the voltage variation of the battery cell 20 is less than or equal to the threshold value.

[0072] The threshold value is a voltage variation amount for determining whether the plateau portion occurs. When the voltage variation amount of the battery cell 20 is less than or equal to the threshold value, it can be determined that the plateau portion occurs in the battery cell 20.

[0073] The processor 500 repeatedly checks for each battery cell 20 whether a plateau portion occurs every time a set cycle passes.

[0074] The processor 500 performs an incremental capacity analysis (ICA) on the battery cell 20 where the plateau portion occurs.

[0075] ICA is a method for more accurately estimating the voltage or capacity of the battery cell 20. Since ICA is obvious to those skilled in the art, a detailed description thereof is omitted here.

[0076] The processor 500 determines whether the capacity variation / voltage variation is equal to or greater than a preset reference value using ICA, and extracts a voltage portion where the capacity variation / voltage variation is equal to or greater than the reference value. Then, the processor 500 sets a peak value in the extracted voltage portion.

[0077] Here, the reference value is a capacity change amount / voltage change amount that is set in advance to set a peak value.

[0078] Figure 2 is a diagram showing a relationship between a voltage of a battery cell and a capacity of the battery cell according to an embodiment of the present disclosure, and Figure 3 is a view illustrating a peak excursion in a platform portion according to one embodiment of the present disclosure.

[0079] Generally, the capacity variation of the battery cell 20 where the platform portion appears is greater than the voltage variation. Therefore, when the battery cell 20 is represented by ICA, the processor 500 may set Figure 3 The peak value is shown.

[0080] Processor 500 stores the voltage and SOC value at the point where the peak value is set.

[0081] exist Figure 2 In FIG. 1 , the dotted line is the voltage versus capacitance relationship in the 50th cycle, and the solid line is the voltage versus capacitance relationship in the 200th cycle.

[0082] When ICA is performed on the battery cell 20, the following can be extracted: Figure 3 The peak value is shown. Figure 3 In each circle in , a peak value in the 50th cycle and a peak value in the 200th cycle are shown.

[0083] The peak value shifts rightward and downward due to factors such as a decrease in maximum capacity or an increase in voltage as the number of cycles of the battery cell 20 increases or as the battery cell 20 ages.

[0084] That is to say, reference Figure 3 , it can be seen that after 150 cycles have passed, the peak voltage in the 50th cycle shifts to the right and downward at the 200th cycle.

[0085] Therefore, the processor 500 can calculate the voltage variation of the peak value. The voltage variation of the peak value is the amount of peak deviation.

[0086] Figure 4 is a diagram showing voltage variation amounts before and after aging progress according to one embodiment of the present disclosure.

[0087] refer to Figure 4 , when two peaks are set in the battery cell 20, two voltage variation amounts dv1 and dv2 can be obtained from the voltages of the two peaks in the 50th cycle and the voltages of the two corresponding peaks in the 200th cycle after 150 cycles. dv1 is about 0.0033 (3.32519-3.32193) V, and dv2 is about 0.0053 (3.35-3.34474) V.

[0088] Then, the processor 500 calculates a voltage variation function of the SOC using the previously stored SOC value of each cycle and the voltage variation between the voltages in the cycle.

[0089] That is, processor 500 extracts the voltage variation function of the SOC value using two SOC values ​​in the 50th cycle and two SOC values ​​in the 200th cycle and a voltage variation between the voltage in the 50th cycle and the voltage in the 200th cycle.

[0090] The processor 500 calculates the voltage variation amount for each SOC value using the extracted voltage variation amount function.

[0091] Processor 500 adds the calculated voltage change amount for each SOC to the OCV of the current SOC value.

[0092] Figure 5 is a view showing a voltage variation function for SOC and a compensated OCV according to one embodiment of the present disclosure.

[0093] refer to Figure 5 , the voltage change function is y=0.01*x-0.0017. The two points are dv1(0.0033) and dv2(0.0053).

[0094] Therefore, the processor 500 calculates the voltage variation of the SOC value using the voltage variation function. The processor 500 may compensate the OCV by adding the calculated voltage variation of the SOC value to the existing OCV.

[0095] Figure 6 is a diagram illustrating OCV to which a voltage variation function is applied according to one embodiment of the present disclosure.

[0096] refer to Figure 6 , shows the compensated OCV obtained by adding the voltage change between dv1 and dv2 to the existing OCV.

[0097] Meanwhile, the processor 500 may extract the voltage variation function in various ways according to the number of peak values. The processor 500 may use at least one of constant processing, interpolation / extrapolation, a cutting method, and curve fitting.

[0098] Figure 7 is a view showing an example of extracting a voltage variation amount according to one embodiment of the present disclosure.

[0099] refer to Figure 7 , when the number of peak values ​​is one, the processor 500 processes the voltage variation function as a constant.

[0100] When the number of peak values ​​is two, the processor 500 extracts the voltage variation function using interpolation / extrapolation or curve fitting.

[0101] When the number of peaks is three or more, the processor 500 may use interpolation / extrapolation, use an interpolation / extrapolation and cutting method, or use curve fitting.

[0102] In the following, reference will be made to Figure 8 A method for compensating for the OCV of a battery according to one embodiment of the present disclosure is described.

[0103] Figure 8 is a flow chart of a method for compensating for OCV of a battery according to one embodiment of the present disclosure.

[0104] refer to Figure 8 Every time a preset set cycle passes, for example, every time 150 cycles pass, the processor 500 may determine whether a plateau portion appears in each battery cell 20 based on the voltage of each battery cell 20 detected by the voltage sensor 200 ( S100 ).

[0105] To this end, the processor 500 determines whether the voltage variation of the battery cell 20 in the corresponding cycle is less than or equal to a threshold. As a result of the determination, when the voltage variation of the battery cell 20 is less than or equal to the threshold, the processor 500 may determine that a platform portion occurs in the corresponding battery cell 20.

[0106] The processor 500 may set a peak value in a voltage portion where a capacity variation amount / voltage variation amount is equal to or greater than a preset reference value by performing ICA on the battery cell 20 where the plateau portion occurs ( S200 ).

[0107] When the peak value is set, the processor 500 may store the voltage and the SOC value at the point where the peak value is set ( S300 ).

[0108] When the voltage and the SOC value at the point where the peak value is set in a plurality of set cycles are stored, the processor 500 may calculate the voltage variation amount using the voltage of the peak value at each cycle ( S400 ).

[0109] For example, when two peaks are set in the 50th cycle and the voltages of the corresponding peaks are shifted in the 200th cycle, two voltage changes dv1 and dv2 can be obtained from the voltages of the two peaks in the 50th cycle and the two peaks in the 200th cycle after 150 cycles.

[0110] The processor 500 extracts a voltage variation function of the SOC using a previously stored SOC value of each cycle and a voltage variation between voltages in the cycle ( S500 ).

[0111] That is, processor 500 extracts the voltage variation function of the SOC value using two SOC values ​​in the 50th cycle and two SOC values ​​in the 200th cycle and a voltage variation between the voltage in the 50th cycle and the voltage in the 200th cycle.

[0112] In this case, the processor 500 may use at least one of constant processing, interpolation / extrapolation, a cutting method, and curve fitting according to the number of peaks.

[0113] Then, the processor 500 calculates the voltage variation of each SOC value using the extracted voltage variation function, and compensates for the OCV by adding the calculated voltage variation of each SOC to the OCV of the existing SOC value ( S600 ).

[0114] The embodiments described herein may be implemented as, for example, methods or processes, devices, software programs, data streams or signals. Although discussed only in the context of a single form of embodiment (e.g., discussed only as a method), the implementation of the features discussed may also be implemented in other forms (e.g., devices or programs). The device may be implemented with appropriate hardware, software, firmware, etc. The method may be implemented in a device such as a processor, which generally refers to a processing device including a computer, a microprocessor, an integrated circuit, a programmable logic device, etc. The processor also includes a communication device such as a computer, a cellular phone, a personal digital assistant ("PDA"), and another device that facilitates information communication between end users.

[0115] An apparatus and method for compensating for OCV of a battery according to one aspect of the present disclosure may more simply and accurately compensate for OCV of an SOC according to an aging direction of a battery cell and improve performance of an algorithm for estimating a state of a battery cell.

[0116] Although the present disclosure has been described with reference to the embodiments shown in the accompanying drawings, it is only exemplary, and those skilled in the art will appreciate that various modifications and other equivalent embodiments may be made therefrom. Therefore, the true technical protection scope of the present disclosure shall only be limited by the appended claims.

Claims

1. A device for compensating an open circuit voltage (OCV) of a battery, the device comprising: A voltage sensor configured to detect a voltage of a battery cell; as well as A processor is configured to extract a peak voltage value and a state of charge (SOC) value within a preset voltage portion of each preset set cycle based on the voltage value of the battery cell detected by the voltage sensor each time a preset set cycle is passed, and to compensate for OCV using the SOC value of each peak value and the voltage variation of the peak value.

2. The device according to claim 1, wherein: The processor extracts the voltage value and the SOC value of the peak value within the voltage section when a plateau section appears in the battery cell.

3. The device according to claim 1, wherein: The processor extracts the peak value in a voltage portion where a capacity variation amount / voltage variation amount is equal to or greater than a preset reference value by using an incremental capacity analysis ICA during a constant current charging or discharging process of the battery cell.

4. The device according to claim 1, wherein: The processor adds the voltage change amount of the SOC value to an OCV value.

5. The device according to claim 4, wherein: The processor extracts a voltage change amount function of the SOC value, and calculates the voltage change amount of the SOC value using the voltage change amount function.

6. The device according to claim 5, wherein: The processor extracts the voltage variation function using at least one of constant processing, interpolation / extrapolation, a cutting method, and curve fitting depending on the number of peak values.

7. The device according to claim 6, wherein: When the number of the peak values ​​is one, the processor processes the voltage variation function as a constant.

8. The device according to claim 6, wherein: When the number of the peaks is plural, the processor extracts the voltage variation function by at least one of the interpolation / extrapolation, the cutting method, and the curve fitting.

9. A method for compensating an open circuit voltage (OCV) of a battery, the method comprising: Extracting, by a processor, a peak voltage value and a state of charge (SOC) value within a preset voltage section of each cycle based on a voltage value of the battery cell detected by a voltage sensor; as well as The OCV is compensated by the processor using the SOC value of each peak value and the voltage variation of the peak value.

10. The method according to claim 9, wherein: When extracting the voltage value and the SOC value of the peak value within the preset voltage section of each cycle, the processor extracts the voltage value and the SOC value of the peak value within the voltage section when a plateau section appears in the battery cell.

11. The method according to claim 9, wherein: When extracting the voltage value and the SOC value of the peak value within the preset voltage portion of each cycle, the processor extracts the peak value in the voltage portion where the capacity change / voltage change is equal to or greater than a preset reference value by utilizing incremental capacity analysis ICA during the constant current charging or discharging process of the battery cell.

12. The method according to claim 9, wherein: In the compensating of the OCV, the processor adds the voltage change amount of the SOC value to an OCV value.

13. The method according to claim 12, wherein: In the compensation of the OCV, the processor extracts a voltage change amount function of the SOC value, and calculates the voltage change amount of the SOC value using the voltage change amount function.

14. The method according to claim 13, wherein: In the compensating of the OCV, the processor extracts the voltage variation function using at least one of constant processing, interpolation / extrapolation, a cutting method, and curve fitting depending on the number of peaks.

15. The method according to claim 14, wherein: In the compensation of the OCV, when the number of the peak values ​​is one, the processor processes the voltage variation function as a constant.

16. The method according to claim 14, wherein: In the compensation of the OCV, when the number of the peak values ​​is plural, the processor extracts the voltage variation function by at least one of the interpolation / extrapolation, the cutting method, and the curve fitting.

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