Correction device and correction method for correcting initial value of impedance spectroscopy measurement device

Abstract

The invention relates to a correction device for correcting an impedance spectroscopy measuring device. The correction device includes: a first plate including a first connection portion electrically connected to a first electrode of the impedance spectroscopy measurement device; the second plate comprises a second connecting part which is electrically connected with a second electrode of the measuring device; and a reference unit mounted on the first plate and having a predetermined unique value, in which the first connection portion is electrically connected to the second connection portion via the reference unit.

Description

Technical Field

[0001] Cross - Reference to Related Applications

[0002] This application claims the priority benefit of Korean Patent Application No. 10 - 2022 - 0132747, filed on October 14, 2022, the entire contents of which are hereby incorporated by reference. Technical Field

[0004] The present invention relates to a calibration device and a calibration method for initial value calibration of an electrochemical impedance spectroscopy measurement device for diagnosing the state of a battery cell. Background Art

[0005] A non - destructive diagnostic method as a method for diagnosing the state of a battery includes electrochemical impedance spectroscopy (EIS). Electrochemical impedance spectroscopy is a method for analyzing impedance by applying a minute sinusoidal current and voltage signal to a range from the high - frequency range to even the low - frequency range, and then, within a range where the battery is in electrical and thermal equilibrium, in response to the applied signal, measuring the amplitude and phase changes based on the voltage and current signals. The sinusoidal signal can be applied to a range from high - frequency to low - frequency, and the impedance at each frequency can be derived from the response signal generated in response to the applied signal. Since electrochemical impedance spectroscopy is a method for analyzing internal mechanisms by using the frequency region, there is an advantage that for each frequency region, the states of components (i.e., the positive electrode, negative electrode, separator, electrolyte, etc.) included in the battery system can be analyzed separately.

[0006] Since an electrochemical impedance measurement device is sensitive to minute changes in current and voltage signals, it is important to accurately set the initial values of the measurement device before measuring the impedance spectrum of a battery cell to minimize potential errors. Therefore, it is necessary to check whether the initial values set in the measurement device are accurately set, and as a result of the check, if the initial values are not accurately set, it is necessary to correct the preset initial values. Here, when measuring the impedance spectrum by using a battery cell to check whether the set initial values are accurately set, component changes inside the battery cell may occur each time in a measurement device that is sensitive to even minute changes in current and voltage. Therefore, there is a problem that errors occur in the output signal and these errors are accumulated, making it difficult to check whether the set initial values are accurate. Summary of the Invention

[0007] Technical Problem

[0008] An object of the present invention for solving the above problems is to provide a calibration device and a calibration method for initial value calibration of a measurement device for measuring an impedance spectrum, which can check whether the initial setting values of the measurement device are accurately set, and calculate calibration values so as to calibrate the initial setting values when the setting of the initial setting values is inaccurate.

[0009] Technical solution

[0010] According to an embodiment of the present invention, the present invention provides a calibration device for calibrating a measurement device for measuring an impedance spectrum, the calibration device including: a first plate including a first connection portion electrically connected to a first electrode of the measurement device; a second plate including a second connection portion electrically connected to a second electrode of the measurement device; a reference unit mounted on the first plate and having a predetermined electrical value, wherein the first connection portion and the second connection portion are electrically connected to each other through the reference unit.

[0011] The reference unit may be configured such that the impedance spectrum is measured by the measurement device.

[0012] The first plate may further include a fixing unit electrically connected to the first connection portion through the reference unit, and the second plate may further include a connection unit that contacts the fixing unit to electrically connect the fixing unit to the second connection portion.

[0013] The connection unit may contact the fixing unit.

[0014] A sliding hole may be defined in the longitudinal direction in the connection unit, a coupling unit may be inserted into the sliding hole, and the inserted coupling unit may be coupled to the fixing unit.

[0015] The reference unit may be a capacitor.

[0016] The first plate may further include a mounting portion in which a receiving space for mounting the reference unit is defined.

[0017] The first plate may further include a guiding unit provided in the longitudinal direction of the first plate and provided below the connection unit.

[0018] The guiding unit may have the same height as the height of the fixing unit.

[0019] Each of the fixing unit and the connection unit may include a metal member.

[0020] As another embodiment of the present invention, the present invention provides a calibration method for a measurement device for calibrating a measured impedance spectrum, the calibration method comprising the steps of: connecting a first electrode and a second electrode of the measurement device to a first connection part and a second connection part of the calibration device respectively; applying a sinusoidal input signal to a reference unit through the measurement device, the reference unit electrically connecting the first connection part to the second connection part; and in response to the applied input signal, outputting an output signal including the impedance spectrum.

[0021] The calibration method may further include calculating a calibration value by comparing the output signal with a predetermined electrical value of the reference unit, and then calibrating the measurement device to the calibration value.

[0022] The output signal may include one or more of a Bode plot and a Nyquist plot.

[0023] As another embodiment of the present invention, the present invention provides a measurement device assembly, which includes: a measurement device for measuring an impedance spectrum; a jig structure (zig structure) electrically connected to each of a first electrode and a second electrode of the measurement device; and a calibration device coupled to the jig structure, wherein the calibration device includes: a first plate including a first connection part electrically connected to the first electrode of the measurement device; a second plate including a second connection part electrically connected to the second electrode of the measurement device; a reference unit mounted on the first plate and having a predetermined electrical value, wherein the first connection part and the second connection part are electrically connected to each other through the reference unit.

[0024] Advantageous Effects

[0025] In the device and method for calibrating the initial value of a measurement device for measuring an impedance spectrum according to the present invention, a capacitor that is stable against changes in internal components can be used to obtain a more accurate calibration value, and electrical connection can be achieved not through leads but through metal members to minimize the noise included in the output signal. Description of the Drawings

[0026] Figure 1 is a diagram illustrating a configuration in which a battery cell is combined with a measurement device for measuring an impedance spectrum.

[0027] Figure 2 is a perspective view illustrating a configuration in which a calibration device, a measurement device for measuring an impedance spectrum, and a jig structure are combined according to an embodiment of the present invention.

[0028] Figure 3 is a plan view illustrating the structure of a correction device according to an embodiment of the present invention.

[0029] Figure 4 is a plan view illustrating a correction device having one reference unit according to an embodiment of the present invention, a manner in which negative and positive pins provided in the reference unit are connected to each of a link unit and a coupling unit through leads, and a method for adjusting a distance between a first plate and a second plate.

[0030] Figure 5 is a plan view illustrating a correction device having two reference units according to another embodiment of the present invention, a manner in which negative and positive pins provided in each reference unit are connected to each of a link unit and a coupling unit through leads, and a method for adjusting a distance between a first plate and a second plate.

[0031] Figure 6 is an illustration when viewed from the side Figure 4 of a configuration in which a fixing unit, a connecting unit, and a first plate are combined through a coupling unit in part "A".

[0032] Figure 7 is an illustration of Figure 4 an enlarged view of a pattern groove of a link unit and a pattern groove of a second connection part in parts "B" and "C" therein.

[0033] Figure 8 is a perspective view illustrating a configuration in which negative and positive pins provided in a reference unit are connected to each of a link unit and a fixing unit through leads according to an embodiment of the present invention.

[0034] Figure 9 and Figure 10 are a plan view and a front view illustrating a configuration in which a reference unit is connected to a link unit and a fixing unit through a connecting unit according to another embodiment of the present invention. Detailed Description of the Invention

[0035] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. The accompanying drawings are included to provide a further understanding of the present invention and merely illustrate embodiments of the present invention. The scope of the present invention is not limited by the accompanying drawings. In the drawings, the same reference numerals always denote the same elements. For ease of understanding of the present invention, some components may be exaggerated, reduced, or omitted.

[0036] Refer to Figure 1 and Figure 2, the present invention relates to a calibration device 10 for initial value calibration of a measuring device 1 for measuring impedance spectra, and a battery cell C or the calibration device 10 can be connected to a fixture structure 2 electrically connected to a first electrode and a second electrode of the measuring device 1. The measuring device 1 can apply a minute sinusoidal current and voltage signal to a range from a high frequency range down to a low frequency range to visually display an output signal.

[0037] Referring to Figure 3 , the calibration device 10 can include a first plate 100, a second plate 200, and a reference unit 300.

[0038] The first plate 100 can have a predetermined thickness and is arranged in the form of a flat plate such that other components are arranged on the first plate 100.

[0039] The first plate 100 can include a first connection part 110, a fixing unit 120, a coupling unit 130, a guiding unit 140, and a mounting part 150. The first connection part 110, the fixing unit 120, the coupling unit 130, and the guiding unit 140 can be arranged on one surface of the first plate 100. Additionally, the mounting part 150 can be arranged on the one surface of the first plate 100. The first plate 100 can include an electrically insulating material such that no current flows through it.

[0040] The first connection part 110 can be arranged at a side part on the one surface of the first plate 100 to be electrically connected to the first electrode of the measuring device 1. Additionally, the first connection part 110 can be used to electrically connect the reference unit 300 to the first electrode of the measuring device 1.

[0041] The first connection part 110 can include a supporting unit 111, a linking unit 112, and a fastening unit 113.

[0042] The supporting unit 111 can separate the linking unit 112 through which current can flow and the top surface of the first plate 100 by its thickness to prevent current from directly flowing through the first plate 100.

[0043] The supporting unit 111 can have an end portion that is set not to exceed the area of the top surface of the first plate 100, and the linking unit 112 connected to the supporting unit 111 can protrude outward from the first plate 100. Thus, the linking unit 112 can be connected to the first electrode connection part of the fixture structure 2 of the measuring device 1.

[0044] The linking unit 112 can be arranged on the top surface of the supporting unit 111, and at least a part of it can protrude outward from the area of the top surface of the first plate 100. The protruding part can be connected to the fixture structure 2 of the measuring device 1.

[0045] The link unit 112 may include a conductive metal material such that current flows therethrough toward or away from the first electrode. For example, the link unit 112 may include one or more of silver, copper, gold, aluminum, and tungsten, but is not limited thereto.

[0046] The link unit 112 may include a metal member in the form of, for example, a metal sheet, a metal strip, a metal rod, a metal bar, or a metal plate having a predetermined thickness and width. In this case, compared to when connected in a common wiring form, the link unit 112 may have a larger horizontal cross-sectional area to reduce resistance, and since movement is reduced, noise input to the measuring device 1 (which outputs a signal sensitively even to minute current flow) for measuring the impedance spectrum can be minimized.

[0047] A plurality of link units 112 may be provided, and the plurality of link units 112 may be provided to be spaced apart from each other by a predetermined distance on a plurality of support units 111 that are spaced apart from each other by a predetermined distance. When a plurality of link units 112 are provided, the link units 112 may be electrically connected to the reference unit 300 by a 4-wiring resistance connection method. Therefore, values such as resistance generated by the leads through which the measuring device 1 is electrically connected to the reference unit 300 can be minimized to accurately measure the very small impedance value of the reference unit 300.

[0048] The horizontal cross-section of the link unit 112 may have, for example, a polygonal shape such as a square, a rectangle, a pentagon, or a hexagon, a closed curve figure such as a circular shape or an oval shape, etc., but its shape is not limited thereto.

[0049] Pattern grooves 112a having a predetermined pattern may be defined at the ends of each of one surface or two surfaces of the link unit 112. When the link unit 112 is connected to the first electrode connection portion of the measuring device 1, the pattern grooves 112a may form friction to increase the physical coupling force between the first electrode connection portion of the measuring device 1 and the link unit 112. In addition, the pattern grooves 112a may increase the contact area with the first electrode connection portion of the jig structure 2 of the measuring device 1 to allow current to flow well.

[0050] The fastening unit 113 may fasten the link unit 112 to the support unit 111 to fix the link unit 112 to the support unit 111. The fastening unit 113 may provide a spiral protrusion having a spiral shape continuous along the circumference of the main body portion 113b, and thus the level of the fastening force may be adjusted according to the rotation direction of the fastening unit 113 to fasten the fastening unit 113 more strongly or more weakly. Depending on the situation, the fastening unit 113 may be separated from the link unit 112 and the support unit 111.

[0051] The fastening unit 113 may include a head 113a and a body portion 113b. The head 113a may be coupled to an upper portion of the body portion 113b, and when the head 113a is held by a finger and then rotated in a clockwise or counterclockwise direction, the body portion 113b may also rotate in the same direction as the rotation direction of the head 113a. The head 113a may include a material such as plastic, which is an electrically insulating material. The body portion 113b may be made of a metal material having high conductivity, so that the body portion 113b and the link unit 112 may be in contact with each other and electrically connected.

[0052] The body portion 113b and the reference unit 300 may be electrically connected to each other through a lead wire, and thus, the link unit 112 and the reference unit 300 may also be electrically connected to each other.

[0053] The fixing unit 120 may be coupled to one surface of the first plate 100 and may be in contact with and electrically connected to the connection unit 220 fastened to the second plate 200.

[0054] The fixing unit 120 may electrically connect the connection unit 220, which will be described later, and the reference unit 300 to each other and may include a conductive metal material through which an electric current flows. For example, the fixing unit 120 may include one or more of silver, copper, gold, aluminum, and tungsten, but is not limited thereto.

[0055] The fixing unit 120 may have a predetermined thickness and width and may include a metal member in the form of, for example, a metal sheet, a metal strip, a metal rod, a metal bar, or a metal plate. In this case, compared with when connected in a common wiring form, the fixing unit 120 may have a larger horizontal cross-sectional area to reduce resistance, and since the movement is reduced, the noise input to the measuring device 1 for measuring the impedance spectrum (the measuring device 1 outputs a signal even sensitively to a minute current flow) may be minimized.

[0056] The horizontal cross-section of the fixing unit 120 may have a polygonal shape such as, for example, a square, a rectangle, a pentagon, or a hexagon, a closed curve figure such as a circular shape or an oval shape, etc., but the shape is not limited thereto.

[0057] The fixing unit 120 may be provided at the other side portion of one surface of the first plate 100, and the other side portion is opposite to one side portion where the first connection portion 110 is provided.

[0058] The fixing units 120 may be provided in plurality, and the plurality of fixing units 120 may be provided to be spaced apart from each other by a predetermined distance on the one surface of the first board 100. When the fixing units 120 are provided in plurality, the fixing units 120 may be electrically connected to the reference unit 300 by a 4-wiring resistance connection method. Accordingly, the value such as resistance generated due to the lead through which the measuring device 1 is electrically connected to the reference unit 300 may be minimized to accurately measure a very small impedance value of the reference unit 300.

[0059] Referring Figure 6 , the coupling units 130 may be provided in plurality to be coupled to the fixing units 120. The coupling units 130 may couple the fixing units 120 to the first board 100, or may be inserted into the sliding holes 221 to couple the fixing units 120 to the first board 100 such that the fixing units 120 and the connection units 220 are in contact with each other.

[0060] The coupling units 130 may have the same structure and shape as the fastening units 113, and may include a head 130a and a body part 130b. The head 130a and the body part 130b of the coupling unit 130 may respectively correspond to the head 113a and the body part 113b of the fastening unit 113.

[0061] The body part 130b may provide spiral protrusions having a spiral shape continuous along the periphery of the body part 130b, and thus the level of the fastening force may be adjusted according to the rotation direction in which the coupling unit 130 rotates to fasten the coupling unit 130 stronger or weaker. Depending on the situation, the coupling unit 130 may be separated from the fixing unit 120 and the first board 100.

[0062] The coupling unit 130 may include a head 130a and a body part 130b. The head 130a may be coupled to the upper part of the body part 130b, and when the head 130a having a polyhedral shape is held by a finger and then rotated in a clockwise direction or a counterclockwise direction, the body part 130b may also rotate in the same direction as the rotation direction of the head 130a. The head 130a may include a material such as plastic, which is an electrically insulating material. The body part 130b may be made of a metal material having high conductivity, and thus the body part 130b and each of the fixing unit 120 and the connection unit 220 may be in contact with each other and electrically connected.

[0063] The body part 130b and the reference unit 300 may be electrically connected to each other by a lead. Accordingly, the fixing unit 120 and the reference unit 300 may also be electrically connected to each other.

[0064] The guiding unit 140 can be set to at least one. The guiding unit 140 can be disposed on the top surface of the first plate 100 in the longitudinal direction of the edge at each of one side or both sides of the first plate 100, and is disposed adjacent to one end of the fixing unit 120.

[0065] The guiding unit 140 can be disposed between the first plate 100 and the connecting unit 220. The guiding unit 140 can extend parallel to the connecting unit 220.

[0066] When the connecting unit 220 slides in contact with the fixing unit 120, the guiding unit 140 can contact the bottom surface of the connecting unit 220 to guide the sliding of the connecting unit 220 while maintaining the set height of the connecting unit 220.

[0067] The guiding unit 140 can have the same height as the fixing unit 120.

[0068] The guiding unit 140 can include an electrically insulating material through which current does not flow, such that the current flowing through the connecting unit 220 does not flow to the first plate 100.

[0069] The fixing unit 120 can be disposed at one end in the longitudinal direction of the guiding unit 140. The guiding unit 140 and the fixing unit 120 can be set to have a curved shape, but are not limited thereto.

[0070] The mounting portion 150 can be disposed on one surface of the first plate 100 and is an area for mounting the reference unit 300.

[0071] A receiving space in which the reference unit 300 can be received can be defined in the mounting portion 150.

[0072] The mounting portion 150 can be disposed between the first connecting portion 110 and the fixing unit 120 such that the reference unit 300 electrically connects the first electrode and the second electrode of the measuring device 1 to each other.

[0073] Refer to Figure 4 and Figure 5 , the second plate 200 can adjust the distance from the first plate. Accordingly, the size of the calibration device 10 can be adjusted such that the calibration device 10 is coupled to match the size of the coupling space of the calibration device defined by the fixture structure 2 of the measuring device 1. The second plate 200 can be provided with a second connecting portion 210 connected to the second electrode of the measuring device 1. The connecting unit 220 can be fastened to the second plate 200. The second plate 200 can move together with the connecting unit 220. The second plate 200 can adjust the distance from the first plate 100 such that the distance is adjusted to 0, and in this case, the second plate 200 can contact the first plate 100.

[0074] The second plate 200 may have a predetermined thickness and be provided in the form of a flat plate such that other components are provided on one of its surfaces.

[0075] The second plate 200 may include an electrically insulating material such that current does not flow therethrough.

[0076] The second connection part 210 may be provided as one or more to be coupled to each of one side or two sides on one surface of the second plate 200. The second connection part 210 may be an area that is coupled to the second electrode connection part of the jig structure 2 of the measuring device 1 to be electrically connected to the second electrode.

[0077] The second connection part 210 may include a conductive metal material such that current flows therethrough. For example, the second connection part 210 may include one or more of silver, copper, gold, aluminum, and tungsten, but is not limited thereto.

[0078] The second connection part 210 may include a metal member in the form of, for example, a metal sheet, a metal strip, a metal rod, a metal bar, or a metal plate having a predetermined thickness and width. In this case, compared with when connected in a common wiring form, the second connection part 210 may have a larger horizontal cross-sectional area to reduce resistance, and since the movement is reduced, the noise input to the measuring device 1 for measuring the impedance spectrum (the measuring device 1 is sensitive to even a minute current flow and outputs a signal) can be minimized.

[0079] The horizontal cross-section of the second connection part 210 may have, for example, a polygonal shape such as a square, a rectangle, a pentagon, or a hexagon, a closed curve figure such as a circular shape or an oval shape, etc., but its shape is not limited thereto.

[0080] At least a part of the second connection part 210 may be provided on the second plate 200, and another part thereof may be provided at a side opposite to the direction in which the first plate 100 is provided to protrude from the distal end of the second plate 200. The second connection part 210 protruding from the distal end of the second plate 200 may be coupled to the second electrode connection part of the jig structure 2.

[0081] The second connection part 210 may have a bent shape. The distal end of the second connection part 210 may extend by being bent perpendicular to the longitudinal direction of the connection unit 220. Therefore, the coupling area with the second electrode connection part of the jig structure 2 of the measuring device 1 may be increased to improve the ease of coupling.

[0082] Refer to Figure 7, a pattern groove 210a having a predetermined pattern may be defined at an end of one surface or each of two surfaces of the second connection part 210. When the second connection part 210 is connected to the second electrode connection part of the measuring device 1, the pattern groove 210a may form friction to increase the physical coupling force between the second electrode connection part of the measuring device 1 and the second connection part 210. Additionally, the pattern groove 210a may increase the contact area with the second electrode connection part of the fixture structure 2 to allow current to flow well.

[0083] The second connection part 210 may be in direct contact with or in contact and electrically connected to the connection unit 220 through a medium.

[0084] The connection unit 220 is a component for connecting the first plate 100 and the second plate 200, and may be a component for moving the second plate 200 to adjust the spacing distance from the first plate 100.

[0085] The connection unit 220 may include a conductive metal material such that current flows through it. For example, the connection unit 220 may include one or more of silver, copper, gold, aluminum, and tungsten, but is not limited thereto.

[0086] The connection unit 220 may include a metal member in the form of, for example, a metal sheet, a metal strip, a metal rod, a metal bar, or a metal plate having a predetermined thickness and width. In this case, compared with when connected in a common wiring form, the connection unit 220 may have a larger horizontal cross-sectional area to reduce resistance, and since the movement is reduced, the noise input to the measuring device 1 for measuring the impedance spectrum (the measuring device 1 is sensitive to even a minute current flow and outputs a signal) may be minimized.

[0087] The horizontal cross-section of the connection unit 220 may have, for example, a polygonal shape such as a square, a rectangle, a pentagon, or a hexagon, a closed curve figure such as a circular shape or an oval shape, etc., but its shape is not limited thereto.

[0088] The connection unit 220 may have one end coupled to the second plate 200 and the other end disposed on the guiding unit 140 located on the first plate 100.

[0089] A sliding hole 221 may be defined in the connection unit 220 in the longitudinal direction such that the connection unit 220 is slidably movable on the guiding unit 140.

[0090] The main body part 130b of the coupling unit 130 may be inserted into the sliding hole 221 such that the inner surface of the sliding hole 221 remains in contact with the main body part 130b of the coupling unit 130, and the inserted main body part 130b may couple the fixing unit 120 disposed below the connection unit 220 to the first plate 100.

[0091] The connecting unit 220 can adjust the position of the main body portion 130b of the coupling unit 130 inserted into the sliding hole 221 within the sliding hole 221 to slide between the guiding unit 140 and the fixing unit 120. Accordingly, the distance between the second plate 200 and the first plate 100 can be adjusted.

[0092] The reference unit 300 can include a predetermined inherent value, and the inherent value can be an electrical or electronic value.

[0093] The reference unit 300 can be a capacitor or a supercapacitor. The reference unit 300 can generate an output signal while obstructing the flow of an input signal through an impedance that is a predetermined electrical / electronic value and by changing the amplitude and phase according to the frequency of the input current and voltage signals.

[0094] The impedance of the reference unit 300 can be a resistance value that varies according to the frequency of the current and sinusoidal voltage input into the reference unit 300.

[0095] The reference unit 300 can be provided as one or more, and can be mounted on the mounting portion 150 of the first plate 100. When the reference unit 300 is provided as multiple units, the reference units 300 can be electrically connected in parallel. When multiple reference units 300 are provided and connected in parallel, the number of times the impedance of the reference unit 300 is measured for a single charge of the reference unit 300 can be increased to improve convenience of use.

[0096] The reference unit 300 can be connected to the fastening unit 113 and the coupling unit 130 using leads or the like by means of a 4-wire resistance connection method. When connecting the reference unit 300 using the 4-wire resistance connection method, the resistance, contact resistance, etc. generated due to the leads connected to the reference unit 300 can be reduced to minimize the occurrence of errors.

[0097] Refer to Figure 4 , as an embodiment related to a method for connecting the reference unit 300 according to the present invention to each of the fastening unit 113 and the coupling unit 130 by leads, when the reference unit 300 is provided as one, the first electrode pin provided in the reference unit can be redundantly connected to the corresponding main body portions 113b of multiple fastening units 113 by multiple leads. The second electrode pin provided in the reference unit 300 can be redundantly connected to the corresponding main body portions 130b of multiple coupling units 130 by multiple leads.

[0098] Refer to Figure 5, as another embodiment related to a method of connecting a reference unit 300 according to the present invention to each of a fastening unit 113 and a coupling unit 130 through leads, when multiple reference units 300 are provided, multiple fastening units 113 can be redundantly connected to a first electrode pin of the reference unit 300 that is disposed closest to the fastening unit 113 through multiple leads, and the first electrode pins of the reference unit 300 can be connected to each other through one lead. In addition, multiple coupling units 130 can be redundantly connected to a second electrode pin of the reference unit 300 that is disposed closest to the coupling unit 130 through multiple leads, and the second electrode pins of the reference unit 300 can be connected to each other through one lead.

[0099] The main body portion 113b of the fastening unit 113 coupled to each of the multiple linking units 112 can be in contact with and electrically connected to the linking unit 112.

[0100] Refer to Figure 8 Describe an embodiment of connecting each of the first electrode and the second electrode of the measuring device 1 in the calibration device 1 according to the present invention to the reference unit 300. The first electrode pin protruding from the reference unit 300 can be electrically connected to the linking unit 112 through an external lead in contact with the main body portion 113b of the fastening unit 113. The second electrode pin protruding from the reference unit 300 can be electrically connected to the fixing unit 120 through an external lead in contact with the main body portion 130b of the coupling unit 130.

[0101] However, the present invention is not limited thereto, and the external lead can be directly connected to each of the fixing unit 120 and the linking unit 112.

[0102] Refer to Figure 9 and Figure 10 Describe another embodiment of connecting each of the first electrode and the second electrode of the measuring device 1 to the reference unit 300. The first plate 100 can further include a first connection unit 160a that electrically connects the mounting portion 150 to the linking unit 112 and a second connection unit 160b that electrically connects the mounting portion 150 to the fixing unit 120. The reference unit 300 can be electrically connected to the linking unit 112 and the fixing unit 120 through the connection units 160a and 160b, respectively. Each of the first electrode pin and the second electrode pin of the reference unit 300 can face the mounting portion 150. The first electrode pin can be electrically connected to the first connection unit 160a that is electrically connected to the linking unit 112, and the second electrode pin can be electrically connected to the second connection unit 160b that is electrically connected to the fixing unit 120.

[0103] The connection units 160a and 160b may be disposed on the inner surface or the bottom surface of the first plate 100 in the longitudinal direction of the first plate 100 such that the connection unit 160a electrically connects the mounting unit 150 to the link unit 112, and the connection unit 160b electrically connects the mounting unit 150 to the fixing unit 120.

[0104] Each of the connection units 160a and 160b may include a conductive metal material such that an electric current flows therethrough. For example, each of the connection units 160a and 160b may include one or more of silver, copper, gold, aluminum, and tungsten, but is not limited thereto.

[0105] Each of the connection units 160a and 160b may include a metal member, a metal coating, or a lead in the form of a metal sheet, a metal strip, a metal rod, a metal bar, or a metal plate having a predetermined thickness and width. In the case where each of the connection units 160a and 160b has a shape such as a metal sheet, a metal strip, a metal rod, a metal bar, or a metal plate, when compared with being connected in the form of common wiring, each of the connection units 160a and 160b may have a larger cross-sectional area to reduce resistance, and since there is less movement, noise input to the measuring device 1 for measuring the impedance spectrum (the measuring device 1 outputs a signal even sensitively to minute current flow) may be minimized.

[0106] The connection units 160a and 160b may contact the main body portion 113b of the fastening unit 113 coupled to the first plate 100 and be electrically connected to the link unit 112. Similarly, the connection units 160a and 160b may contact the main body portion 130b of the coupling unit 130 coupled to the first plate 100 and be electrically connected to the fixing unit 120.

[0107] As another embodiment of the present invention, a calibration method for calibrating the measuring device 1 for measuring the impedance spectrum may include: connecting the first electrode and the second electrode of the measuring device 1 to the first connection portion 110 and the second connection portion 210 of the calibration device 10, respectively, applying a sinusoidal input signal of current or voltage to the reference unit 300 that electrically connects the first connection portion 110 to the second connection portion 210 through the measuring device 1, and outputting an output signal including an impedance spectrum in response to the applied input signal. The above calibration method may further include calculating a calibration value by comparing the output signal with a predetermined electrical value of the reference unit, and then calibrating the measuring device.

[0108] Referring to Figure 1, the measuring device 1 may include a jig structure 2, and several types of pouch - type battery cells C of various sizes can be mounted on the jig structure 2. The first electrode and the second electrode of each of the battery cells C can be mounted on the jig structure 2 to correspond to the first electrode and the second electrode of the jig structure 2 respectively. The measuring device 1 can input a sinusoidal alternating voltage and current into the battery cell C. Thus, the measuring device 1 can display the output signal passing through the battery cell to measure the impedance value of the battery cell C. The displayed output signal can include a Bode plot, a Nyquist plot, etc.

[0109] In order to measure the accurate impedance, before measuring the impedance of the battery cell C by the measuring device 1, it is necessary to check whether the initial value of the measuring device 1 is correctly set. Thus, before measuring the impedance of the battery cell C, the calibration device 10 according to the present invention can be connected to the measuring device 1 to measure the impedance of the reference unit 300 connected to the calibration device 10, and then the impedance of the reference unit 300 can be compared with the impedance which is the predetermined inherent electrical value of the reference unit 300 to determine that when the value obtained by measuring the impedance matches the impedance which is the inherent electrical value, the initial value of the measuring device 1 is correctly set. However, when the value obtained by measuring the impedance does not match the impedance as the inherent electrical value, a correction value can be calculated based on the difference between the values. The calculated correction value can be used to correct the initial value of the measuring device 1.

[0110] Referring to Figure 2 , as another embodiment of the present invention, the present invention can provide a measuring device assembly, which includes a measuring device 1 for measuring an impedance spectrum, a jig structure 2 electrically connected to each of the first electrode and the second electrode of the measuring device, and a calibration device 10 connected to the jig structure 2. The calibration device 10 can include a first plate 100, a second plate 200, and a reference unit 300. The first plate includes a first connection portion 110 electrically connected to the first electrode of the measuring device 1. The second plate includes a second connection portion electrically connected to the second electrode of the measuring device 1, and the reference unit is mounted on the first plate 100 and has a predetermined electrical value. The first connection portion 110 and the second connection portion 210 can be electrically connected to each other through the reference unit 300. The calibration device 10 connected to the jig structure 2 is the same as the above - mentioned calibration device.

[0111] The jig structure 2 can include a first electrode connection portion 3, a second electrode connection portion 4, and a placement portion 5.

[0112] The first electrode connection part 3 can be disposed at one end of the jig structure 2 and is electrically connected to the first electrode of the measuring device 1. The first electrode connection part 3 can be coupled and electrically connected to the link unit 112 of the calibration device 10. The first electrode connection part 3 can be electrically connected to the reference unit 300 by a four-wire resistance connection method. The first electrode connection part 3 can include a plurality of first upper plates and first lower plates, all of which include a conductive metal material. Respectively, a plurality of link units 112 can be disposed on the first lower plate, and a plurality of first upper plates can be disposed on the top surface of the link unit 112. The first lower plate and the first upper plate can apply pressure to the link unit 112 disposed therebetween to couple and electrically connect to the link unit 112. A plurality of second upper plates can be spaced apart from each other by a predetermined distance. An electrical insulator can be attached to the bottom surface of one of the plurality of link units 112 such that the plurality of link units 112 are not electrically connected to each other through the first lower plate and the four-wire resistance connection method is maintained. The second electrode connection part 4 can be disposed at the other end of the jig structure 2 and is electrically connected to the second electrode of the measuring device 1. The second electrode connection part 4 can be coupled and electrically connected to the second connection part 210 of the calibration device 10. The second electrode connection part 4 can be electrically connected to the reference unit 300 by a four-wire resistance connection method. The second electrode connection part 4 can include a plurality of second upper plates and second lower plates, all of which include a conductive metal material. Respectively, a plurality of connection parts 210 can be disposed on the second lower plate, and a plurality of second upper plates can be disposed on the top surface of the connection part 210. The second lower plate and the second upper plate can apply pressure to the connection part 210 disposed therebetween to couple and electrically connect to the connection part 210. A plurality of second upper plates can be spaced apart from each other by a predetermined distance. An electrical insulator can be attached to the bottom surface of one of the plurality of connection parts 210 such that the plurality of connection parts 210 are not electrically connected to each other through the second lower plate and the four-wire resistance connection method is maintained.

[0113] The placement part 5 can be disposed between the first electrode connection part 3 and the second electrode connection part 4 and is an area for placing the calibration device 10 or the battery cell C. The placement part 5 can have a flat top surface such that the calibration device 10 or the battery cell C is stably placed thereon.

[0114] Although the present invention has been described with reference to limited embodiments, the present invention is not limited thereto. Changes and modifications can be made to the embodiments without departing from the spirit and scope of the present invention, and those of ordinary skill in the art to which the present invention pertains will understand that such changes and modifications are to be regarded as being within the scope of the present invention.

[0115] [Description of Symbols]

[0116] 1: Measuring device

[0117] 10: Calibration device

[0118] 100: First plate

[0119] 110: First connecting part

[0120] 111: Support unit

[0121] 112: Linking unit

[0122] 113: Fastening unit

[0123] 113a: Head

[0124] 113b: Main body part

[0125] 120: Fixing unit

[0126] 130: Coupling unit

[0127] 130a: Head

[0128] 130b: Main body part

[0129] 140: Guiding unit

[0130] 150: Mounting part

[0131] 200: Second plate

[0132] 210: Second connecting part

[0133] 220: Connecting unit

[0134] 221: Sliding hole

[0135] 300: Reference unit

Claims

1. A calibration device for calibrating a measuring device, the measuring device being configured to measure an impedance spectrum, the calibration device include: a first plate, the first plate comprising a first connection portion, the first connection portion being electrically connected to a first electrode of the measuring device; a second plate including a second connection portion electrically connected to a second electrode of the measuring device; as well as a reference unit mounted on the first board and having a predetermined electrical value, The first connection portion and the second connection portion are electrically connected to each other through the reference unit.

2. The calibration device according to claim 1, in, The reference unit is configured to cause the measuring device to measure the impedance spectrum.

3. The calibration device according to claim 1, in, The first board further includes a fixing unit electrically connected to the first connection portion through the reference unit, and The second board further includes a connection unit that contacts the fixing unit to electrically connect the fixing unit to the second connection portion.

4. The correction device according to claim 3, in, The connecting unit is in contact with the fixing unit.

5. The correction device according to claim 3, in, A sliding hole is defined in the connecting unit in a longitudinal direction, A coupling unit is inserted into the sliding hole, and the inserted coupling unit is coupled to the fixing unit.

6. The calibration device according to claim 1, in, The reference unit is a capacitor.

7. The calibration device according to claim 1, in, The first board further includes a mounting portion in which a receiving space is defined, and the reference unit is mounted in the receiving space.

8. The correction device according to claim 3, in, The first plate further includes a guide unit disposed in a longitudinal direction of the first plate and below the connection unit.

9. The correction device according to claim 8, in, The guide unit has the same height as that of the fixing unit.

10. The calibration device according to claim 3, in, Each of the fixing unit and the connecting unit includes a metal member.

11. A method for calibrating a measuring device, wherein the measuring device is configured to measure an impedance spectrum. The following steps are involved: Connecting the first electrode and the second electrode of the measuring device to the first connecting portion and the second connecting portion of the calibration device respectively; applying a sinusoidal input signal to the reference unit through the measurement device, the reference unit being configured to electrically connect the first connection to the second connection; as well as In response to the applied input signal, an output signal including the impedance spectrum is output.

12. The correction method according to claim 11, further comprising: include: A correction value is calculated by comparing the output signal with a predetermined electrical value of the reference cell and the measuring device is then calibrated to the correction value.

13. The calibration method according to claim 11, in, The output signal includes one or more of a Bode plot and a Nyquist plot.

14. A measuring device assembly, the measuring device assembly include: a measuring device configured to measure an impedance spectrum; a fixture structure electrically connected to each of the first electrode and the second electrode of the measurement device; as well as a correction device coupled to the fixture structure, Wherein, the correction device comprises: a first plate including a first connection portion electrically connected to the first electrode of the measuring device; a second plate including a second connection portion electrically connected to the second electrode of the measuring device; and a reference unit mounted on the first board and having a predetermined electrical value, The first connection portion and the second connection portion are electrically connected to each other through the reference unit.

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