Measurement device and estimation system

Abstract

SOLUTION: Provided is a measurement device for measuring the magnetic flux density emitted from a battery cell, including a sensor having a sensor cell for measuring the magnetic flux density, and a rotation holding part for rotatably holding the battery cell in a state of maintaining a relative position of the battery cell to the sensor cell. The rotation holding part may hold the battery cell such that a relative position between the battery cell and the sensor is changeable. The rotation holding part may have a rotating part that rotates the battery cell. The rotation holding part may move the sensor cell with respect to the battery cell.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a measurement device and an estimation system. [Background technology]

[0002] A battery unit including a lithium ion battery or the like is composed of a plurality of battery cells and is used as a power source for electric vehicles and the like.

[0003] Techniques for measuring magnetic flux density at multiple points around a battery have existed for some time (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-46007 Summary of the Invention

[0005] In a first aspect of the present invention, a measuring device for measuring the magnetic flux density emitted from a battery cell is provided, the measuring device comprising: a sensor having a sensor cell for measuring the magnetic flux density; and a rotary holding unit for rotatably holding the battery cell while maintaining the relative position of the battery cell with respect to the sensor cell.

[0006] In the above-described measuring device, the rotation holder may hold the battery cell so that the relative position of the battery cell and the sensor can be changed.

[0007] In any of the above measuring devices, the rotary holder may have a rotating part that rotates the battery cell.

[0008] In the above-described measuring device, the rotating holder may move the sensor cell relative to the battery cell.

[0009] Any of the above measurement devices may further include a control unit that acquires the measurement results of the magnetic flux density from the sensor at at least two rotation angles of the battery cell.

[0010] In the above measurement device, the control unit may control the relative positions of the sensor and the battery cell, and acquire measurement results at at least two rotation angles in each of at least two relative positions.

[0011] In any of the above measuring devices, the rotating holder may further have a cell substrate to which the rotating part is fixed and a sensor substrate to which the sensor is fixed, and the cell substrate may be movable relative to the sensor substrate.

[0012] In the above-described measuring device, the sensor substrate may have a plurality of positioning holes that determine the relative positions of the sensor and the battery cell, and the cell substrate may have positioning pins that are inserted into the plurality of positioning holes.

[0013] The sensor substrate may have rails for moving the relative positions of the sensor and the battery cell.

[0014] In any of the above measuring devices, the rotation holder may have a moving part that moves the relative positions of the sensor and the battery cell.

[0015] In any of the above measuring devices, the rotation holding portion may have a cell holding portion into which the battery cell is inserted and which includes a recess or protrusion for determining the rotation angle, and a support portion that is fixed to the cell substrate and contacts and supports the recess or protrusion of the cell holding portion.

[0016] In the above-described measuring device, the support portion may be rotatable about the same rotation axis as the rotation axis of the battery cell.

[0017] In any of the above measurement devices, the control unit may acquire a plurality of measurements of the magnetic flux density in the sensor at each of at least two rotation angles, and record an average value of the plurality of measurements at each rotation angle in the database.

[0018] In any of the above measuring devices, the control unit may acquire the measurement results of the magnetic flux density from the sensor when a current with a value greater than the registered current value is passed through the battery cell, and record the measurement results of the magnetic flux density in the database in correspondence with the registered current value.

[0019] In a second aspect of the present invention, an estimation system is provided that includes: a database that records measurement results of the magnetic flux density for each angle state when current is passed through at least one type of battery cell used in a battery unit while changing the angle state of the battery cell; a state input unit to which state data indicating the arrangement and angle state of each battery cell within the battery unit including multiple battery cells is input; and an estimation unit that determines the magnetic flux density generated by each battery cell based on the angle state and the measurement results recorded in the database, and estimates the magnetic flux density generated by the battery unit based on the magnetic flux density generated by each battery cell and the arrangement of each battery cell.

[0020] The above estimation system may further include an acquisition unit that acquires actual measurement results using a measurement device that measures the magnetic flux density emitted from a battery cell, the measurement device including a sensor having a sensor cell that measures the magnetic flux density, and a rotational holding unit that rotatably holds the battery cell while maintaining the relative position of the battery cell with respect to the sensor cell, and records the measurement results in a database.

[0021] The above summary of the invention does not list all of the necessary features of the present invention, and subcombinations of these features may also constitute inventions. [Brief explanation of the drawings]

[0022] [Figure 1] 1 shows a schematic diagram of a measurement device 10 according to the present embodiment. [Figure 2] FIG. 2 is a perspective view showing in more detail the rotation holder 30 in the measuring device 10 according to the present embodiment. [Figure 3]1 is a schematic top view showing a holding jig 60 and a cell substrate 235, which are parts of a rotary holding unit 30. FIG. [Figure 4] 1 is a schematic perspective view of a holding jig 60, which is a part of the rotation holding unit 30, seen from above. [Figure 5] 10 is a schematic perspective view of a holding jig 60, which is a part of the rotation holding unit 30, as seen from below. FIG. [Figure 6] FIG. 2 is an explanatory diagram showing the arrangement of the sensor cell 22 and the battery cell 15 during measurement. [Figure 7] 1 shows a schematic perspective view of a holding jig 60 of a rotation holding unit 30 of a first modified example of the measuring device 10 of the present embodiment. [Figure 8] FIG. 10 shows a top view of a holding jig 60 in a first modified example. [Figure 9] 10 shows a schematic top view of a part of a rotation holder 30 of a second modified example of the measuring device 10 of the present embodiment. [Figure 10] FIG. 3 is a flow chart showing the measurement operation of the measurement device 10 of the present embodiment. [Figure 11] 1 is an example of a measurement result database that records measurement results in the measurement device 10. [Figure 12] 8 shows a schematic diagram of an estimation system 800 according to the present embodiment. [Figure 13] 8 shows a flow diagram of the operation of authenticity determination in the estimation system 800 according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present invention will be described below through embodiments of the invention, but the following embodiments do not limit the scope of the invention according to the claims. Furthermore, not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0024] Fig. 1 shows a schematic diagram of a measurement device 10 according to this embodiment, in which a battery cell 15 to be measured is arranged.

[0025] Here, when a battery unit such as a lithium-ion battery is energized (charged or discharged), the magnetic field it generates varies depending on the type and arrangement of the battery cells 15 contained therein. Therefore, by energizing a shipped battery unit and measuring its magnetic flux density, it is possible to identify the individual battery unit and determine whether it is genuine. However, the magnetic flux density also varies depending on the angle of the battery cell 15, depending on the arrangement of the battery tabs (lead wires) inside the battery cell 15, etc. Therefore, when determining whether a battery unit is genuine based on magnetic flux density, measurement data of the magnetic flux density, which varies depending on the angle of the battery cells in a genuine battery unit, is required in advance. In particular, when using machine learning to determine whether a battery unit is genuine, a large amount of measurement data is required for training the determiner. As an example, the measuring device 10 of this embodiment can actually measure and acquire measurement data for determining whether a battery unit is genuine.

[0026] The measuring device 10 of this embodiment measures the magnetic flux density emitted from the battery cell 15 at multiple rotation angles. The measuring device 10 includes a sensor 20, a rotation holding unit 30, and a control unit 40. As an example, the arrangement, dimensions, number, etc. of each component of the measuring device 10 of this embodiment may be set according to the arrangement of the battery cell 15 in the battery unit to be inspected for authenticity and the arrangement of the battery cell 15 and the sensor 20 when inspecting for authenticity.

[0027] The sensor 20 may output a measurement result according to at least one magnetic field in the x-axis, y-axis, or z-axis direction. The sensor 20 has a plurality of sensor cells 22 and is also called a sensor array. The sensor cells 22 are, for example, Hall elements. The sensor 20 has a plurality of sensor cells 22 arranged in a two-dimensional array, and each sensor cell 22 may output a measurement result of the magnetic flux density in the x-axis, y-axis, and z-axis directions.

[0028] The rotation holder 30 rotatably holds the battery cell 15 while maintaining the relative position of the battery cell 15 with respect to the sensor cell 22. The rotation holder 30 may apply electricity to the battery cell 15 during measurement.

[0029] The control unit 40 may be a computer such as a personal computer (PC), a tablet computer, a smartphone, a workstation, a server computer, or a general-purpose computer, or may be a computer system in which multiple computers are connected. Such a computer system is also a computer in the broad sense. The control unit 40 may also be implemented by one or more virtual computer environments executable within a computer. The control unit 40 may also be an internal computer of the sensor 20.

[0030] The control unit 40 is connected to the sensor 20 and the rotation holding unit 30. The control unit 40 may control various operations of the rotation holding unit 30. The control unit 40 may acquire the measurement results of the magnetic flux density by the sensor 20 at at least two rotation angles of the battery cell 15. The control unit 40 has a condition input unit 100, a current supply unit 110, a drive unit 120, a processing unit 130, and a memory unit 140.

[0031] The condition input unit 100 is connected to the input device 70. A user may input magnetic flux density measurement conditions to the condition input unit 100 via the input device 70. The input device 70 may be a terminal (PC, smartphone, etc.) used by the user, a keyboard, a touch panel, a mouse, or the like.

[0032] The current supply unit 110 is connected to the condition input unit 100. The current supply unit 110 may supply current to the battery cell 15 in response to measurement conditions being input to the condition input unit 100. The current supply unit 110 may supply current to the battery cell 15 by controlling a power source connected to the battery cell 15. The current supply unit 110 may cause a current of a value indicated by the measurement conditions or a predetermined current value to flow through the battery cell 15.

[0033] The drive unit 120 is connected to the condition input unit 100. The drive unit 120 may drive and control the rotation and holding unit 30 in response to measurement conditions input to the condition input unit 100. The drive unit 120 may drive and control the rotation and holding unit 30 so as to rotate the battery cell 15 at a rotation angle in accordance with the measurement conditions. The drive unit 120 may drive and control the rotation and holding unit 30 so as to move the relative positions of the battery cell 15 and the sensor 20 in accordance with the measurement conditions.

[0034] The processing unit 130 is connected to the current supply unit 110, the drive unit 120, and the sensor 20. The processing unit 130 receives the measurement results of the magnetic flux density measured by the sensor 20. The processing unit 130 may receive the current value of the current flowing through the battery cell 15 from the current supply unit 110. The processing unit 130 may receive data indicating the state of the rotation holding unit 30, such as the rotation angle of the battery cell 15, from the drive unit 120. The processing unit 130 may perform preprocessing on the received measurement results and output the preprocessed measurement results to the memory unit 140.

[0035] The storage unit 140 is connected to the processing unit 130. The storage unit 140 stores a measurement result database that records the measurement results of actual measurements of magnetic flux density. The storage unit 140 may record the measurement results in the measurement result database in association with the measurement conditions.

[0036] FIG. 2 is a perspective view showing the rotational holder 30 in more detail in the measuring device 10 according to this embodiment. FIG. 3 is a schematic top view showing a holding jig 60, which is part of the rotational holder 30, and a cell substrate 235. FIG. 4 is a schematic perspective view of the holding jig 60, which is part of the rotational holder 30, seen from above. FIG. 5 is a schematic perspective view of the holding jig 60, which is part of the rotational holder 30, seen from below. Note that the x-axis, y-axis, and z-axis shown in all figures each indicate the same directions. Furthermore, in the description, up and down refer to the z-axis direction.

[0037] The measuring device 10 can measure the magnetic flux density of one battery cell 15 held by the rotating holder 30 while changing the angular state and the relative position with respect to the sensor cell 22. In this embodiment, an example is shown in which the rotating holder 30 holds a cylindrical battery cell 15, but this is not limited thereto, and the battery cell 15 having a polyhedral shape such as a hexahedron may also be the measurement target of the measuring device 10 of this embodiment.

[0038] The rotating holder 30 has a sensor substrate 200, column sections 210, 215, a cross section 220, a slider 225, a sensor movement section 230, a cell substrate 235, mounting sections 240, 245, a first current-carrying terminal 250, a second current-carrying terminal 255, and a rotating section 260. The cell substrate 235, mounting sections 240, 245, the first current-carrying terminal 250, the second current-carrying terminal 255, and the rotating section 260 constitute a holding jig 60 that rotatably holds the battery cell 15 and applies current to the battery cell 15.

[0039] The sensor 20 is fixed to the sensor substrate 200. In this embodiment, the sensor 20 may be fixed to the sensor substrate 200 via the column portions 210, 215, the crossing portion 220, the slider 225, and the sensor moving portion 230 so that the sensor 20 is disposed above the cell substrate 235. The sensor substrate 200 may fix the sensor 20 to a position where the magnetic flux density generated by the battery cell 15 can be measured. The sensor substrate 200 may be a plate-shaped member and may be made of, but is not limited to, metal or resin.

[0040] The sensor substrate 200 has a plurality of positioning holes 202 (for example, a total of 28 positioning holes 202 in FIG. 3 of this embodiment) on its top surface that determine the relative positions of the sensor 20 and the battery cells 15. The plurality of positioning holes 202 may position the cell substrate 235 at a plurality of different positions. The plurality of positioning holes 202 may be through-holes or may be recesses that do not penetrate the sensor substrate 200. The plurality of positioning holes 202 may be provided to correspond to the positions of the plurality of battery cells 15 in the target genuine battery unit. This allows the rotating holder 30 to hold the battery cells 15 so that the relative position of the battery cells 15 and the sensor 20 can be changed. The measuring device 10 can measure the magnetic field of the battery cells 15 at a plurality of different relative positions with respect to the sensor 20 using the plurality of positioning holes 202.

[0041] The two pillars 210, 215 each have their lower ends fixed to different end peripheries of the sensor substrate 200 and extend upward. The crossing portion 220 is fixed between the upper end of one pillar 210 and the upper end of the other pillar 215, and crosses above the sensor substrate 200. The slider 225 is fixed to the center of the crossing portion 220 and has a recess that extends vertically.

[0042] The sensor moving unit 230 is movably installed in a recess of the slider 225, and is fixed so that the sensor 20 faces the battery cell 15 (or the upper surface of the sensor substrate 200) to be measured. The sensor moving unit 230 may have the sensor 20 fixed thereto so that the two-dimensional array of multiple sensor cells 22 is arranged along the upper surface of the cell substrate 235. The sensor moving unit 230 is connected to the control unit 40 and may have an actuator (e.g., an electric motor or a hydraulic cylinder) that moves up and down relative to the slider 225 under the control of the control unit 40. As the sensor moving unit 230 moves up and down, the sensor 20 fixed to the sensor moving unit 230 moves up and down. During measurement, the sensor moving unit 230 may be moved to the lower end of the slider 225 so that the sensor 20 faces the battery cell 15 in close proximity, and may be moved to the upper end of the slider 225 except during measurement, such as when the holding jig 60 is moved. The sensor moving unit 230 may also be manually moved up and down by a user relative to the slider 225. The rotary holder 30 has the slider 225 and the sensor moving unit 230, and thus can move the sensor cell 22 relative to the battery cell 15. Such vertical movement of the sensor 20 allows the holding jig 60 to be placed at the measurement position.

[0043] The rotating part 260 is fixed to the cell substrate 235. The cell substrate 235 may be movable relative to the sensor substrate 200. The cell substrate 235 may be detachably disposed on the sensor substrate 200. The cell substrate 235 may be a plate-like member formed of metal or resin. The cell substrate 235 may have positioning pins 237 that are inserted into a plurality of positioning holes 202 of the sensor substrate 200. The cell substrate 235 may have a plurality of positioning pins 237, and is positioned by inserting the plurality of positioning pins 237 into the plurality of positioning holes 202, respectively. The positioning pins 237 may be formed to protrude from the lower surface of the cell substrate 235.

[0044] The mounting portions 240, 245 are disposed between the first current-carrying terminal 250 and the second current-carrying terminal 255, protrude from the upper surface of the cell substrate 235, and come into contact with the held battery cell 15. The mounting portions 240, 245 have the battery cell 15 placed on their upper surfaces and hold the battery cell 15 at a predetermined height. The mounting portions 240, 245 may be rectangular parallelepiped-shaped and may have anti-slip surfaces on the upper surface that come into contact with the battery cell 15. A plurality of mounting portions 240, 245 may be disposed between the first current-carrying terminal 250 and the second current-carrying terminal 255.

[0045] The first current-carrying terminal 250 is connected to one electrode (for example, the positive electrode) of the battery cell 15, and the second current-carrying terminal 255 is connected to the other electrode (for example, the negative electrode) of the battery cell 15. The first current-carrying terminal 250 and the second current-carrying terminal 255 may have a metal portion for conducting electricity to the battery cell 15 and a non-slip portion around the metal portion that comes into contact with and holds the battery cell 15. In this embodiment, the first current-carrying terminal 250 and the second current-carrying terminal 255 are connected to electrodes on one end surface and the other end surface of the cylindrical battery cell 15, and clamp and hold the battery cell 15 on the mounting portions 240, 245 using a clamp or the like.

[0046] The rotation unit 260 rotates the battery cell 15. The rotation unit 260 may be capable of rotating the battery cell 15 while maintaining the relative position of the battery cell 15 with respect to the sensor 20. For example, the rotation unit 260 may rotate the battery cell 15 about a rotation axis in the y-axis direction while being held by the first and second current-carrying terminals 250 and 255. The rotation unit 260 may rotate the battery cell 15 by rotating the first and second current-carrying terminals 250 and 255 about the rotation axis in the y-axis direction while being held by the rotation unit 260. The rotation axis may be an axis passing through the centers of two end faces of the battery cell 15 (for example, in the case of a cylindrical battery cell 15, an axis passing through the centers of two circular end faces of the battery cell 15). The rotation unit 260 may be an actuator (for example, a stepping motor, a servo motor, or a hydraulic cylinder) connected to the control unit 40 and rotating the battery cell 15 under the control of the control unit 40. Furthermore, the rotation unit 260 may be configured to allow the user to manually rotate the battery cell 15.

[0047] FIG. 6 is an explanatory diagram showing the arrangement of the sensor cell 22 and the battery cells 15 during measurement. FIG. 6 shows an example of acquiring data for determining whether a battery unit has seven battery cells 15 arranged in two rows inside. The measurement device 10 performs measurement by moving one battery cell 15 held by a holding jig 60 to multiple cell positions a1 to an (n>1, n=14 in this embodiment) relative to the two-dimensional array of sensor cells 22. The cell position may be the relative position of the sensor cell 22 and the battery cell 15. The measurement device 10 performs measurement at each angle while rotating the battery cell 15 at each cell position ai (1≦i≦n). The example in FIG. 1 shows an example of measurement at relative position a1.

[0048] FIG. 7 shows a schematic perspective view of a holding jig 60 of a rotating holder 30 of a first modified example of the measuring device 10 of this embodiment. FIG. 7 shows the holding jig 60 of the first modified example in a state in which it holds a battery cell 15. FIG. 8 shows a schematic top view of the holding jig 60 of the first modified example in a state in which it does not hold a battery cell 15. The holding jig 60 of the first modified example has the same configuration and function as the holding jig 60 of the rotating holder 30 of the embodiment of FIGS. 1 to 6, and can be used in place of the holding jig 60 of FIGS. 1 to 6 in the rotating holder 30. Below, the differences between the holding jig 60 of the first modified example and the holding jig 60 of FIGS. 1 to 6 will be mainly described.

[0049] The holding jig 60 has a cell substrate 235, two mounting portions 300, 302, a first current-carrying terminal 250, a second current-carrying terminal 255, a rotating portion 260, a cell holding portion 305, and a support portion 310. The cell substrate 235, the first current-carrying terminal 250, and the second current-carrying terminal 255 may have the same configuration and function as the holding jig 60 of the measuring device 10 of the embodiment shown in FIGS.

[0050] The two mounting portions 300, 302 are disposed between the first current-carrying terminal 250 and the second current-carrying terminal 255. The mounting portions 300, 302 protrude from the upper surface of the cell substrate 235 and contact the cell holding portion 305 into which the battery cell 15 is inserted. The cell holding portion 305 is placed on the upper surface of the mounting portions 300, 302, and the mounting portions 300, 302 hold the battery cell 15 at a predetermined height. The mounting portions 300, 302 have a recess in the x-z cross section at their upper end, and the battery cell 15 is placed in the recess. In Figures 7 and 8, the mounting portions 300, 302 have a V-shaped recess in the x-z cross section at their upper end. However, the shape of the recess is not limited to this and may be a U-shaped recess that matches the side shape of the battery cell 15. The mounting portions 300, 302 may have a non-slip surface on the upper surface of the recess where it comes into contact with the battery cell 15.

[0051] The cell holding portion 305 includes a recess into which the battery cell 15 is inserted and which defines the rotation angle. The cell holding portion 305 may have a hollow portion into which the battery cell 15 is inserted. The cell holding portion 305 may have a shape that matches the shape of the battery cell 15, and in this embodiment, it is a hollow cylindrical shape. The cell holding portion 305 may be arranged in contact with the mounting portions 300, 302 with the battery cell 15 inserted during measurement. The cell holding portion 305 may include multiple recesses formed on its side surface at predetermined rotation angles (at predetermined angular intervals). The recesses may penetrate the side surface of the cell holding portion 305 so that the side surface of the held battery cell 15 is exposed, or may be formed without penetrating the side surface of the cell holding portion 305. The recesses may be formed vertically along the side surface of the cell holding portion 305. The recesses may be formed at a position that is located between the two mounting portions 300, 302 during measurement. The cell holder 305 may be made of metal or resin.

[0052] The support portion 310 is fixed to the cell substrate 235 and contacts and supports the recessed portion of the cell holding portion 305. The support portion 310 may be disposed between the two mounting portions 300, 302. The support portion 310 may have a shape that allows it to be inserted into the recessed portion of the cell holding portion 305. For example, the support portion 310 may be a pin-shaped portion that protrudes from the upper surface of the cell substrate 235, and may be inserted into the recessed portion of the cell holding portion 305 when the cell holding portion 305 with the battery cell 15 inserted is mounted on the mounting portions 300, 302. This allows the angle of the battery cell 15 to be easily adjusted by the recessed portion of the cell holding portion 305, even when the user manually installs the cell holding portion 305.

[0053] The support portion 310 may be rotatable around the same rotation axis as the rotation axis of the battery cell 15. The support portion 310 may be fixed to the two mounting portions 300, 302 and rotatable together with the mounting portions 300, 302 around the same rotation axis as the rotation axis of the battery cell 15 relative to the cell substrate 235. The support portion 310 may be rotatable at a rotation angle smaller than the angle between adjacent recesses of the cell holder 305. As an example, if the recesses of the cell holder 305 are formed at 10-degree intervals around the rotation axis, the support portion 310 and the mounting portions 300, 302 may be rotatable around the rotation axis by ±5 degrees. This makes it possible to adjust the angle between adjacent recesses of the cell holder 305. The support portion 310 may be connected to the control unit 40 and may have an actuator (for example, an electric motor such as a brush motor or a hydraulic cylinder) for rotating the support portion 310 under the control of the control unit 40.

[0054] The cell holding portion 305 may have a protrusion, in which case the support portion 310 may contact and hold the protrusion of the cell holding portion 305. For example, the cell holding portion 305 may have a plurality of pin-shaped protrusions that protrude radially from the side surface of the cell holding portion 305. The support portion 310 may have a concave upper end portion into which the protrusion of the cell holding portion 305 is inserted when the cell holding portion 305 with the battery cell 15 inserted is placed on the placement portion 300, 302. The support portion 310 may also be formed as a recess on the upper surface of the cell substrate 235 into which the protrusion of the cell holding portion 305 is inserted.

[0055] FIG. 9 is a schematic top view of a portion of the spin holder 30 of a second modified example of the measuring apparatus 10 of this embodiment. FIG. 9 shows a portion of the spin holder 30, with other portions omitted. The spin holder 30 of the second modified example has the same configuration and function as the spin holder 30 of the measuring apparatus 10 of the embodiment shown in FIGS. 1 to 6, except that it does not have multiple positioning holes 202 and instead has rails 400, 405, 410, 415 and a cell moving unit 420. Below, differences from the spin holder 30 of FIGS. 1 to 6 will be mainly described.

[0056] The sensor substrate 200 has rails 400, 405, 410, and 415 for moving the relative positions of the sensor 20 and the battery cell 15. The rails 400, 405, 410, and 415 move the cell substrate 235 relative to the sensor 20. The rails 400, 405, 410, and 415 extend in the x-axis direction in a concave shape on the upper surface of the sensor substrate 200, and the cell substrate 235 can move along the rails 400, 405, 410, and 415. Positioning pins 237 on the underside of the cell substrate 235 can be inserted into the rails 400, 405, 410, and 415, and the cell substrate 235 can move along the rails 400, 405, 410, and 415 in the x-axis direction. The rails 400, 405, 410, and 415 can be positioned in the y-axis direction by moving the cell substrate 235 between the different rails 400, 405, 410, and 415. A plurality of rails 400, 405, 410, and 415 may be arranged parallel to one another. In this embodiment, two positioning pins 237 of the cell substrate 235 are inserted into two rails 400 and 410, respectively, and the holding jig 60 can be manually moved by a user to two different positions in the y-axis direction for each of the two rails 400, 410, and 405, 415. This allows the cell substrate 235 to be moved on the multiple rails 400, 405, 410, and 415. When a target battery unit is composed of multiple rows of battery cells 15, data corresponding to the target battery unit can be acquired. Furthermore, these rails may be any mechanism that allows the sensor 20 and the battery cells 15 to move relative to one another on the sensor substrate 200, and may be, for example, grooves.

[0057] The cell moving unit 420 moves the relative positions of the sensor 20 and the battery cell 15. The cell moving unit 420 may move the holding jig 60 holding the battery cell 15 on the rails 400, 405, 410, and 415. The cell moving unit 420 may be fixed to the sensor substrate 200 and may move the cell substrate 235 on the rails 400, 405, 410, and 415 relative to the sensor substrate 200. The cell moving unit 420 may have an extension / contraction unit 425. One end of the extension / contraction unit 425 may be fixed to the cell substrate 235. The cell moving unit 420 may move the cell substrate 235 on the rails 400, 405, 410, and 415 by extending and contracting the extension / contraction unit 425 in the x-axis direction using an actuator (for example, an electric motor such as a brush motor, or a hydraulic cylinder). The cell moving unit 420 may be connected to the driving unit 120 of the control unit 40, and the extension / retraction unit 425 may be extended or retracted under the control of the control unit 40. In this way, the control unit 40 may control the relative position between the sensor 20 and the battery cell 15 and acquire measurement results at at least two rotation angles for each of at least two relative positions. Note that the cell moving unit 420 may automatically move the holding jig 60 in the y-axis direction under the control of the control unit 40. In this case, the cell moving unit 420 may move the holding jig 60 by raising it from the two rails 400, 410 in the z-axis direction, moving it in the y-axis direction, and lowering it onto different rails 405, 415.

[0058] Note that the configuration of the spin holder 30 in the first and second modifications may be partially replaceable with part of the spin holder 30 of the measuring device 10 in FIGS.

[0059] 10 is a flow diagram showing the measurement operation of the measurement device 10 of this embodiment. The measurement device 10 may start the measurement operation when the power is turned on. In this embodiment, the measurement device 10 generates a measurement result database used to determine whether a battery unit having battery cells 15 arranged as shown in FIG. 6 is a genuine product, as an example.

[0060] In step S500, the user inputs measurement conditions to the condition input unit 100 via the input device 70. The measurement conditions input to the condition input unit 100 may include at least one of the following: the current value of the current to be passed through the battery cell 15 during measurement, the interval between rotation angles of the battery cell 15, the number of measurements at each cell position and each angle state, cell position information (the number of cell positions, or coordinates indicating the cell position relative to the sensor 20, etc.), information indicating the battery cell 15 to be measured (type, shape, or product identification information, etc.), or information indicating an authentic battery unit (the number, arrangement, angle state, type, shape, or product identification information of the included battery cells 15, etc.).

[0061] In step S510, the measuring device 10 places one battery cell 15 at cell position ai. For the first measurement (rotation angle θ = 0 degrees, cell position a1), the user may manually place the battery cell 15. A rotation angle reference marker may be attached to the battery cell 15 at the position of a battery tab, etc. For the first measurement, the user may hold the battery cell 15 between the first current-carrying terminal 250 and the second current-carrying terminal 255 so that the reference marker coincides with a predetermined position (for example, a position facing directly upward) in the holding jig 60. The driving unit 120 may raise the sensor moving unit 230 on the slider 225 before placing the battery cell 15, and may control the sensor moving unit 230 to lower on the slider 225 after placing the battery cell 15 so that the sensor 20 is placed at the measurement position.

[0062] In step S520, the measurement device 10 measures the magnetic flux density using the sensor 20 while the held battery cell 15 is not energized. The processing unit 130 may acquire the magnetic flux density from each of the multiple sensor cells 22. This allows the processing unit 130 to obtain the magnetic flux density.

[0063] In step S530, the measuring device 10 measures the magnetic flux density while current is being applied to the battery cell 15. The current-applying unit 110 may apply a current to the battery cell 15 via the first current-applying terminal 250 and the second current-applying terminal 255 in accordance with a registered current value indicated by the input measurement conditions. Here, the registered current value may be a set current value of a current to be applied to the battery cell 15 in the battery unit during authenticity determination. For example, the control unit 40 may input, via the processing unit 130, a measurement result of the magnetic flux density measured by the sensor 20 when the current-applying unit 110 applies a current to the battery cell 15 with a value greater than the registered current value. As an example, the current-applying unit 110 may apply a current to the battery cell 15 with a value calculated by multiplying the registered current value by a predetermined current-applying coefficient (e.g., a value corresponding to the number of battery cells 15 in the target battery unit (hereinafter also referred to as the total number of cells)). As an example, the predetermined current-applying coefficient may be √(total number of cells). By passing a current with a large value corresponding to the number of battery cells 15, noise in magnetic field measurement can be reduced by dividing the measurement results of the measuring device 10 by the same current coefficient when using the results to determine whether the battery unit is genuine.

[0064] The processing unit 130 may output the difference between the magnetic flux density measured in the energized state and the magnetic flux density measured in step S520 to the storage unit 140 as the measurement result.

[0065] In step S540, the storage unit 140 receives the measurement result indicating the magnetic flux density from the processing unit 130 and records it in the measurement result database. The storage unit 140 may record the measurement result in the measurement result database in association with the registered current value. The storage unit 140 may further record at least one of the measurement current value received from the current supply unit 110, information indicating the operation of the rotation holder 30 received from the drive unit 120 (rotation angle, cell position, etc.), and information indicating the target battery unit input to the condition input unit 100 in association with the measurement result in the measurement result database.

[0066] In step S550, the measuring device 10 determines whether the current rotation angle θ of the battery cell 15 is less than 360 degrees. The measuring device 10 may calculate the total rotation angle θ of the battery cell 15 at the current cell position from information received from the driving unit 120 (for example, information on the rotation angle and the number of rotations). If the rotation angle is less than 360 degrees (Yes in S550), the measuring device 10 proceeds to step 510. If the rotation angle is 360 degrees or greater (No in S550), the measuring device 10 proceeds to step 560.

[0067] In step S510, which is performed after step S550, the measurement device 10 changes the rotation angle of the battery cell 15 to the next angle state. For example, the drive unit 120 causes the rotation unit 260 to rotate the battery cell 15 by a predetermined rotation angle. As an example, the drive unit 120 causes the rotation unit 260 to rotate the battery cell 15 by a predetermined rotation angle (for example, 10 degrees) around a rotation axis that passes through the center of the first current-carrying terminal 250 and the center of the second current-carrying terminal 255. Thereafter, steps S520 to S550 may be repeated.

[0068] In step S560, the measuring device 10 determines whether the cell position ai of the current battery cell 15 is less than the total number of cells in the target battery unit. The measuring device 10 may obtain the total number of cells from the measurement conditions input to the condition input unit 100. In an example of obtaining data for authenticating a battery unit in which seven battery cells 15 are arranged in two rows, as shown in FIG. 6, if the current cell position ai at which the magnetic flux density is measured is cell position a14, the measuring device 10 may determine that the number of cells is not less than the total number of cells, and if the current cell position ai is any of cell positions a1 to a13, the measuring device 10 may determine that the number of cells is less than the total number of cells.

[0069] If the current cell position ai of the battery cell 15 is less than the total number of cells (Yes in S560), the measuring device 10 proceeds to step 510. If the current cell position ai is equal to or greater than the total number of cells (No in S560), the measuring device 10 may end the measurement operation.

[0070] In step S510, which follows step S560, the measuring device 10 moves the position of the battery cell 15 to the next cell position. For example, in the case of the rotating holder 30 of the second modified example in Fig. 9, the driving unit 120 causes the cell moving unit 420 to move the holding jig 60 on the rails 400, 405, 410, 415 by a predetermined distance in the x-axis direction. Thereafter, steps S520 to S560 may be repeated.

[0071] After the measurement operation is completed, the measurement device 10 may perform preprocessing on the measurement results recorded in the measurement result database and record the preprocessed measurement results in the measurement result database. In steps S500 to S560, the processing unit 130 of the control unit 40 may acquire multiple measurement results of magnetic flux density from the sensor 20 at each of at least two rotation angles, calculate an average value of the multiple measurement results at each rotation angle through preprocessing, and record the calculated average value in the measurement result database. The user may input measurement conditions to the condition input unit 100 for performing measurements at each cell position over multiple rotations (for example, the total number of cells × 360 degrees). This allows the measurement device 10 to repeat steps S500 to S560 in the same way even after completing the measurement operation in step S560 (No in S560). The measuring device 10 performs measurements while rotating the battery cell 15 multiple times at each cell position, allowing the processing unit 130 to acquire the same number of magnetic flux densities at each rotation angle at each cell position as the number of rotations (for example, the same number of magnetic flux densities as the total number of cells). Therefore, the processing unit 130 may calculate an average value of the multiple magnetic flux densities acquired at each rotation angle at each cell position and record this in the measurement result database. For example, the processing unit 130 can acquire the same number of measurement results as the total number of cells at each rotation angle at each cell position and calculate the average value.

[0072] By calculating such an average value, the standard deviation of noise in the measurement results can be reduced to, for example, 1 / √(total number of cells). As a result, since the magnetic field measurements of battery cell 15 are performed the same number of times as the total number of cells and preprocessed, the noise that is superimposed by adding the measurement results at each cell position when determining whether the product is genuine can be reduced in advance by preprocessing.

[0073] In addition, the measurement device 10 may omit step S540, store the measurement results in the processing unit 130, perform preprocessing on the stored measurement results in the same manner before completing the measurement operation, and record the preprocessed measurement results in the measurement result database after completing the measurement operation.

[0074] Fig. 11 is an example of a measurement result database that records measurement results in the measurement device 10. The measurement result database records measurement results in association with cell positions a1 to an. Fig. 11 omits the measurement results for cell positions a2 to an-1.

[0075] The measurement result database records each rotation angle and the corresponding magnetic flux density on the x-axis, y-axis, and z-axis at each cell position. In Fig. 11, the rotation angle is the angle of rotation from the reference position of the battery cell 15 (rotation angle 0 degrees).

[0076] The magnetic flux density (x-axis) is the magnetic flux density in the x-axis direction measured from one battery cell 15 at the corresponding rotation angle, and is a measurement value acquired from the multiple sensor cells 22. As an example, Bx0 is the magnetic flux density in the x-axis direction of the multiple sensor cells 22 at a rotation angle of 0 degrees at cell position a1, and therefore indicates the same number of magnetic flux densities as the number of sensor cells 22. The magnetic flux density (y-axis) is the magnetic flux density in the y-axis direction measured from one battery cell 15 at the corresponding rotation angle, and is a magnetic flux density acquired from the multiple sensor cells 22. As an example, By0 is the magnetic flux density in the y-axis direction of the multiple sensor cells 22 at a rotation angle of 0 degrees at cell position a1, and therefore indicates the same number of magnetic flux densities as the number of sensor cells 22. The magnetic flux density (z-axis) is the magnetic flux density in the z-axis direction measured from one battery cell 15 at the corresponding rotation angle, and is a magnetic flux density acquired from the multiple sensor cells 22. As an example, Bz0 is the magnetic flux density in the z-axis direction of the multiple sensor cells 22 at cell position a1 at a rotation angle of 0 degrees, and therefore indicates the same number of magnetic flux densities as the number of sensor cells 22. Each magnetic flux density may be recorded in the measurement result database in association with the position information of the corresponding sensor cell 22.

[0077] The measurement result database as shown in FIG. 11 may be stored in the storage unit 140 in association with information (identification information, etc.) of the target battery unit.

[0078] The measuring device 10 of this embodiment measures the battery cells 15 one by one, and is therefore capable of acquiring data that can represent the individual battery units with a small number of measurements. For example, when predicting the magnetic flux density of a battery unit consisting of 14 battery cells 15, if each battery cell 15 is rotated 360 degrees in 45-degree increments, 8 values ​​can be obtained from all combinations. 14 However, by using the measuring device 10 of this embodiment to measure the magnetic flux density of each battery cell 15 one by one, 8 × 14 measurement results can be obtained, and by combining the measurement results, the magnetic flux densities of all combinations can be reproduced.

[0079] FIG. 12 shows a schematic diagram of an estimation system 800 according to this embodiment. The estimation system 800 estimates the magnetic flux density generated by a battery unit 810 to be evaluated, and determines whether the battery unit 810 to be evaluated is genuine or not using the estimation result. The battery unit 810 may be a lithium-ion battery or the like, and includes multiple battery cells 15 therein. The estimation system 800 includes a measuring device 10, a detecting device 840, an input device 850, a determining device 900, and a display device 950. The measuring device 10 may be the same as the measuring device 10 of this embodiment described with reference to FIGS. 1 to 11, and therefore further description will be omitted.

[0080] The detection device 840 detects the magnetic flux density generated from the battery unit 810 while applying electricity (charging or discharging) to the battery unit 810 to be determined. The detection device 840 may detect the magnetic flux density from the battery unit 810 using a sensor 845 similar to the sensor 20 of the measurement device 10 under the same measurement conditions as those of the measurement device 10 (such as the relative positions of the battery cell 15 and the sensor cell 22).

[0081] The input device 850 may be a terminal used by the user (such as a PC or smartphone), a keyboard, a touch panel, or a mouse, etc. The input device 850 receives various pieces of information regarding authenticity determination from the user.

[0082] The determination device 900 determines whether the battery unit 810 to be determined is genuine based on the magnetic flux density detected by the detection device 840. The determination device 900 includes a state input unit 905, an acquisition unit 910, an estimation unit 920, a measurement unit 925, and a comparison unit 930.

[0083] The status input unit 905 is connected to the input device 850. Information about the battery unit 810 to be determined is input to the status input unit 905 via the input device 850. For example, for a battery unit 810 including a plurality of battery cells 15, the status input unit 905 receives status data indicating the arrangement and angle state of each battery cell 15 within the battery unit 810. The status data may be information based on the assumption that the battery unit 810 is a genuine product.

[0084] The acquisition unit 910 is connected to the state input unit 905 and the measurement device 10. The acquisition unit 910 may have an acquisition database. The acquisition unit 910 acquires measurement results actually measured using the measurement device 10 and records them in the acquisition database. The acquisition database records measurement results obtained by actually measuring the magnetic flux density for each angle state when current is passed through at least one type of battery cell 15 used in the battery unit 810 while changing the angle state of the battery cell 15.

[0085] The estimation unit 920 is connected to the acquisition unit 910. The estimation unit 920 determines the magnetic flux density generated by each battery cell 15 based on the angle state of the battery cell 15 and the measurement results recorded in the acquisition database, and estimates the estimated magnetic flux density generated by the battery unit 810 based on the magnetic flux density generated by each battery cell 15 and the arrangement of each battery cell 15 in the battery unit 810.

[0086] The measurement unit 925 is connected to the detection device 840. The measurement unit 925 may control the sensor 845 of the detection device 840 to measure the magnetic flux density of the battery unit 810 to be determined, and acquire the measurement result of the magnetic flux density in the sensor 845.

[0087] The comparison unit 930 is connected to the estimation unit 920 and the measurement unit 925. The comparison unit 930 compares the magnetic flux density measurement result acquired by the measurement unit 925 with the estimated magnetic flux density estimated by the estimation unit 920, and determines whether the battery unit 810 being evaluated is a genuine product.

[0088] The display device 950 is connected to the comparison unit 930. The display device 950 may be a PC, a display, or the like, and may display the result of the comparison unit 930 determining whether the product is genuine.

[0089] FIG. 13 shows a flow diagram of the authenticity determination operation in the estimation system 800 according to this embodiment.

[0090] In step S600, the status input unit 905 receives status data as input. The status data may include information indicating the battery unit 810. For example, the status data may include at least one of the number, type, and arrangement of the multiple battery cells 15 inside the battery unit 810, the angular state at the position of each battery cell 15 (for example, the angular state with the position of the lead wire set to a reference position of 0 degrees), and identification information of the battery unit 810 (such as the serial number and type). Here, the arrangement of the multiple battery cells 15 may be the relative position of each battery cell 15 with respect to the sensor 845, and may be, for example, coordinates with the center of the xy plane in the battery unit 810 as the reference. The status input unit 905 may also receive status data from the detection device 840. The status input unit 905 outputs the status data to the acquisition unit 910.

[0091] In step S610, the acquisition unit 910 acquires measurement results of the estimation target from the measurement device 10 in accordance with the status data input to the status input unit 905, and records the acquired measurement results in the acquisition database. The acquisition unit 910 may have information such as the angular state or arrangement of the battery cells 15 related to the battery unit 810, and when status data including identification information of the battery unit 810 is input, the acquisition unit 910 may acquire measurement results corresponding to the information such as the angular state or arrangement corresponding to the status data from the measurement device 10. The acquisition unit 910 may record the cell position, rotation angle, and magnetic flux density in association with each other in the acquisition database, similar to the measurement result database of the measurement device 10 shown in FIG. 11. The acquisition unit 910 may acquire measurement results corresponding to each angular state at all cell positions in the measurement database.

[0092] As an example, in the case of an arrangement of seven battery cells 15 in two rows as shown in FIG. 6 , if the status data indicates that the rotation angle at cell position a1 is 1 degree, . . . , and the rotation angle at cell position an (n=14 in the case of the battery unit 810 in FIG. 6 ) is 50 degrees, the acquiring unit 910 may acquire from the measurement device 10 the magnetic flux densities Bx1, By1, Bz1, . . . at cell position a1 and the magnetic flux densities Bx50, By50, Bz50 at cell position an in FIG. 11 . The acquiring unit 910 may acquire from the measurement device 10 the measurement results of the multiple sensor cells 22 at each rotation angle at each cell position and record them in the acquisition database. As an example, the acquiring unit 910 may record, as the magnetic flux density Bx50, the magnetic flux densities in the x-axis direction, the same number as the number of sensor cells 22, in association with information on the arrangement of the sensor cells 22 (such as identification information and coordinates), in the acquisition database.

[0093] In addition, the acquisition unit 910 may acquire the measurement conditions of the measurement device 10 (for example, the current value passed through the battery cell 15 during measurement, the current coefficient, or the registered current value, etc.) and record them in the acquisition database in association with the measurement results.

[0094] In step S620, the estimation unit 920 estimates the magnetic flux density generated by the battery unit 810 using the measurement results recorded in the acquisition database. The estimation unit 920 may estimate the sum of the acquired magnetic flux densities for one combination of the arrangement and angular state of the multiple battery cells 15 indicated by the status data as the estimated magnetic flux density generated by the battery unit 810. The estimation unit 920 may calculate the sum for each of the three axial directions as the estimated magnetic flux density. If the sensor 20 has multiple sensor cells 22, the estimation unit 920 may calculate the sum of the magnetic flux densities for all cell positions a1 to an for each sensor cell 22 (i.e., the sum of the magnetic flux densities for the same number of cells as the total number of cells) as the estimated magnetic flux density. This allows the estimation unit 920 to calculate the estimated magnetic flux density at the position where each sensor cell 22 is arranged and obtain the distribution of the estimated magnetic flux density on the xy plane.

[0095] As an example, in the case of an arrangement of seven battery cells 15 in two rows as shown in FIG. 6 , if the status data indicates that cell position a1 is at a rotation angle of 1 degree and cell position an is at a rotation angle of 50 degrees, the estimation unit 920 may calculate the sum of the cell positions a1 to an (Bx1 + ⋅ ⋅ + Bx50) for the measurement results of each sensor cell 22 in the x-axis direction as the estimated magnetic flux density in the x-axis direction. Similarly, the estimation unit 920 may calculate the sum of the cell positions a1 to an (By1 + ⋅ ⋅ + By50) for the measurement results of each sensor cell 22 in the y-axis direction as the estimated magnetic flux density in the y-axis direction. Similarly, the estimation unit 920 may calculate the sum of the cell positions a1 to an (Bz1 + ⋅ ⋅ + Bz50) for the measurement results of each sensor cell 22 in the z-axis direction as the estimated magnetic flux density in the z-axis direction.

[0096] When a conduction factor is associated with the measurement result acquired by the acquisition unit 910, the estimation unit 920 may remove noise during measurement by dividing the magnetic flux density of the measurement result by the conduction factor. The estimation unit 920 may calculate an estimated magnetic flux density by dividing the sum of the measurement results by the conduction factor.

[0097] The estimation unit 920 may calculate, as the estimated magnetic flux density, the difference between the sum of the measurement results acquired by the acquisition unit 910 (i.e., the estimated magnetic flux density estimated in the same manner as above) and the reference magnetic flux density. The estimation unit 920 may acquire, via the acquisition unit 910, a measurement result in which the battery cells 15 are arranged in the same position but in a different angular state as the measurement result of the estimation target indicated by the status data (for example, a measurement result obtained by the same measurement device 10 as the measurement result of the estimation target, with the angular state at all cell positions being 0 degrees). The estimation unit 920 may calculate a sum of the acquired measurement results in the same manner as the measurement result of the estimation target, and use the sum as the reference magnetic flux density. The estimation unit 920 may calculate the difference between the sum of the measurement results of the estimation target and the reference magnetic flux density for the measurement results of each sensor cell 22, thereby calculating the distribution of the estimated magnetic flux density at the positions of the multiple sensor cells 22. This makes it possible to remove noise caused by the magnetic field due to the configuration of the measurement device 10 from the estimated magnetic flux density.

[0098] The estimation unit 920 may calculate a distribution of estimated magnetic flux densities weighted according to the ratio of currents flowing through each battery cell 15 in the battery unit 810. The estimation unit 920 may weight each cell position by multiplying the magnetic flux density by a different weight, and may use the sum of the weighted magnetic flux densities as the estimated magnetic flux density. The ratio of currents flowing through each battery cell 15 in the battery unit 810 may be determined in advance by experiment or simulation for a genuine product corresponding to the battery unit 810. The estimation unit 920 may multiply the magnetic flux density measured at a cell position with a larger current ratio by a larger weight, and may multiply the magnetic flux density measured at a cell position with a smaller current ratio by a smaller weight. This allows the estimation unit 920 to estimate an estimated magnetic flux density that reflects the bias in currents flowing through the multiple battery cells 15 in the battery unit 810 when current is applied.

[0099] In step S630, the measurement unit 925 acquires the magnetic flux density detected by the detection device 840 while the battery unit 810 to be determined is energized. As an example, the detection device 840 may be placed in a charging station where a vehicle or the like equipped with the battery unit 810 to be determined is charged, and may detect the magnetic flux density in proximity to the battery unit 810 to be determined during charging. During detection, the detection device 840 may place the battery unit 810 to be determined and the sensor 845 in the same positional relationship as the relative positions of the sensor 20 (sensor cell 22) and the battery unit (battery cell 15) in the measurement device 10 as shown in FIGS. 2 and 6 . The detection device 840 may detect the magnetic flux density in response to the start of charging of the battery unit 810 to be determined, and output the measurement result to the measurement unit 925. The detection device 840 may output to the comparison unit 930 the magnetic flux density distribution in the x-axis, the magnetic flux density distribution in the y-axis, and the magnetic flux density distribution in the z-axis direction obtained by detecting the magnetic flux densities in the x-axis, y-axis, and z-axis directions, respectively, using multiple sensor cells of the sensor 845.

[0100] In step S640, the comparison unit 930 compares the magnetic flux density detected by the detection device 840 with the estimated magnetic flux density estimated by the estimation unit 920. The comparison unit 930 may compare the detected magnetic flux density with the estimated magnetic flux density for corresponding positions (sensor cells at the same position) in the measurement device 10 and the detection device 840. If the difference between the detected magnetic flux density and the estimated magnetic flux density is within a predetermined range, the comparison unit 930 may determine that the battery unit 810 to be determined is an authentic product. If the difference between the detected magnetic flux density and the estimated magnetic flux density is outside the predetermined range, the comparison unit 930 may determine that the battery unit 810 to be determined is an authentic product.

[0101] In step S650, the comparison section 930 outputs the comparison result, and may output display data for causing the display device 950 to display the comparison result.

[0102] According to this embodiment, by combining magnetic flux densities measured in advance at each cell position, the magnetic flux density of a genuine product can be estimated efficiently with a smaller amount of data, thereby enabling efficient identification of battery units that include non-genuine battery cells.

[0103] The estimation system 800 can also determine whether a battery unit 810 in which the angle state of the battery cells 15 is not specified is authentic by the authenticity determination operation of this embodiment. In this case, the determination device 900 may estimate multiple estimated magnetic flux densities for multiple combinations of the angle state of the battery cells 15 and compare each of the multiple estimated magnetic flux densities with the magnetic flux density detected by the detection device 840. This example will be described below.

[0104] First, in step S600, the status input unit 905 may input, as status data, a plurality of combinations of angle states of the battery cells 15 (e.g., a plurality of different combinations at predetermined angle intervals) for one arrangement of the plurality of battery cells 15 on the zy plane of the battery unit 810. As an example, for the arrangement of cell positions as shown in Fig. 6, the status input unit 905 may input status data indicating a combination of cell position a1 at a rotation angle of 0 degrees, cell position a2 at a rotation angle of 10 degrees, and cell position an at a rotation angle of 10 degrees, a combination of cell position a1 at a rotation angle of 10 degrees, cell position a2 at a rotation angle of 10 degrees, and cell position an at a rotation angle of 10 degrees, and a combination of cell position a1 at a rotation angle of 20 degrees, cell position a2 at a rotation angle of 10 degrees, and cell position an at a rotation angle of 10 degrees.

[0105] Next, in step S610, the acquisition unit 910 may acquire measurement results for multiple combinations of angular states according to the state data. In step S620, the estimation unit 920 may estimate multiple estimated magnetic flux densities from the acquired measurement results for the multiple combinations. In step S640, the comparison unit 930 compares the magnetic flux density detected by the detection device 840 with each of the multiple estimated magnetic flux densities estimated by the estimation unit 920. If the difference between at least one of the multiple estimated magnetic flux densities and the detected magnetic flux density is within a predetermined range, the comparison unit 930 can determine that the battery unit 810 being evaluated is genuine. On the other hand, if the difference between the detected magnetic flux density and all of the multiple estimated magnetic flux densities is outside the predetermined range, the comparison unit 930 can determine that the battery unit 810 being evaluated is not genuine.

[0106] The state input unit 905, the acquisition unit 910, and the estimation unit 920 may be included in the measurement device 10, and the estimated magnetic flux density estimated by the estimation unit 920 may be recorded in the measurement database of the memory unit 140 of the measurement device 10.

[0107] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention.

[0108] It should be noted that the execution order of each process, such as operations, procedures, steps, and stages, in the devices, systems, programs, and methods shown in the claims, specifications, and drawings is not specifically stated as "before," "prior to," etc., and that the processes can be performed in any order unless the output of a previous process is used in a subsequent process. Even if the operational flow in the claims, specifications, and drawings is described using "first," "next," etc. for convenience, this does not mean that the processes must be performed in this order. [Explanation of symbols]

[0109] 10. Measuring equipment 15 battery cells 20 sensors 22 sensor cell 30 Rotation holding part 40 Control Unit 60 Holding jig 70 Input Device 100 Condition input section 110 Electrical part 120 Drive unit 130 Processing section 140 Storage section 200 Sensor substrate 202 Positioning hole 210 Column section 215 Column section 220 Crossing Section 225 slider 230 Sensor moving part 235 Cell Substrate 240 Placement section 245 Placement section 250 1st energizing terminal 255 2nd energizing terminal 260 Rotating part 300 Placement section 302 Placement section 305 Cell holder 310 Support part 400 rail 405 Rail 410 Rail 415 Rail 420 Cell Transfer Unit 800 Estimation System 810 Battery Unit 840 Detection Device 845 Sensors 850 Input Device 900 Judgment device 905 Status input section 910 Acquisition Department 920 Estimation part 925 Measuring part 930 Comparison Section 950 Display device

Claims

1. A measuring device for measuring magnetic flux density emitted from a battery cell, a sensor having a sensor cell for measuring the magnetic flux density; a rotation holding unit that rotatably holds the battery cell while maintaining the relative position of the battery cell with respect to the sensor cell; A measuring device comprising:

2. The rotation holder holds the battery cell so that the relative position of the battery cell and the sensor can be changed. The measuring device according to claim 1 .

3. The rotation holding unit has a rotation unit that rotates the battery cell. The measuring device according to claim 1 .

4. The rotation holding unit moves the sensor cell relative to the battery cell. The measuring device according to claim 3 .

5. a control unit configured to acquire the measurement results of the magnetic flux density from the sensor at at least two rotation angles of the battery cell; The measuring device according to claim 3 .

6. The control unit controls the relative positions of the sensor and the battery cell, and acquires the measurement results at the at least two rotation angles at each of the at least two relative positions. The measuring device according to claim 5 .

7. The rotation holding unit is a cell substrate to which the rotating part is fixed; a sensor substrate to which the sensor is fixed; The cell substrate is movable relative to the sensor substrate. The measuring device according to claim 3 .

8. the sensor substrate has a plurality of positioning holes that determine the relative positions of the sensor and the battery cell; The cell substrate has positioning pins that are inserted into the positioning holes. The measuring device according to claim 7.

9. The sensor substrate has a rail for moving the relative positions of the sensor and the battery cell. The measuring device according to claim 7.

10. The rotation holding unit has a moving unit that moves the relative position between the sensor and the battery cell. The measuring device according to claim 1 .

11. The rotation holding unit is a cell holder into which the battery cell is inserted and which includes a recess or a protrusion for defining a rotation angle; a support portion fixed to the cell substrate and contacting and supporting the recess or the protrusion of the cell holding portion; The measuring device according to claim 7.

12. The support portion is rotatable about the same rotation axis as the rotation axis of the battery cell. The measuring device according to claim 11.

13. The control unit acquires a plurality of measurement results of the magnetic flux density by the sensor at each of the at least two rotation angles, and records an average value of the plurality of measurement results at each rotation angle in a database. The measuring device according to claim 5 .

14. The control unit acquires the measurement result of the magnetic flux density by the sensor when a current having a value greater than a registered current value is passed through the battery cell, and records the measurement result of the magnetic flux density in a database in association with the registered current value. The measuring device according to claim 5 .

15. a database that records measurement results of magnetic flux density for at least one type of battery cell used in a battery unit, the measurement results being obtained by measuring the magnetic flux density for each angle state when a current is passed through the battery cell while changing the angle state of the battery cell; and a state input unit to which state data indicating the arrangement and angle state of each of the battery cells in the battery unit is input, for the battery unit including a plurality of the battery cells; an estimation unit that determines a magnetic flux density generated by each of the battery cells based on the angular state and the measurement results recorded in the database, and estimates a magnetic flux density generated by the battery unit based on the magnetic flux density generated by each of the battery cells and the arrangement of each of the battery cells; An estimation system comprising:

16. A measuring device for measuring magnetic flux density emitted from a battery cell, a sensor having a sensor cell for measuring the magnetic flux density; a rotation holding unit that rotatably holds the battery cell while maintaining the relative position of the battery cell with respect to the sensor cell; and further comprising an acquisition unit that acquires the measurement results actually measured using the measurement device and records them in the database. The estimation system of claim 15.

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