Secondary battery measuring device for measuring width and thickness of secondary battery and secondary battery measuring method comprising same

Abstract

The present invention relates to a secondary battery measuring device for measuring the width and thickness of a secondary battery and a secondary battery measuring method comprising same, and specifically, to a secondary battery measuring device comprising: a seating die on which the secondary battery is seated; a pair of vertical frames disposed on the upper surface of the seating die to be spaced a predetermined distance apart from each other and to vertically extend by a predetermined length; a horizontal frame extending by a predetermined length and connected to each of the pair of the vertical frames; a pair of width measuring sensors provided on side surfaces of the pair of the vertical frames, respectively; and a thickness measuring sensor provided on the horizontal frame, and a secondary battery measuring method using same.

Description

A secondary battery measuring device for measuring the width and thickness of a secondary battery and a secondary battery measuring method including the same

[0001] This application claims the benefit of priority based on Korean Patent Application No. 2024-0161735 filed November 14, 2024, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0002] The present invention relates to a secondary battery measuring device for measuring the width and thickness of a secondary battery and a secondary battery measuring method including the same. Specifically, it relates to a secondary battery measuring device for measuring the width and thickness of a secondary battery and a secondary battery measuring method including the same, which can simultaneously measure the width and thickness of a secondary battery, thereby improving measurement efficiency.

[0003] Recently, due to air pollution caused by the use of fossil fuels and the development of alternative energy sources resulting from energy depletion, the demand for secondary batteries capable of storing generated electrical energy is increasing.

[0004] Rechargeable batteries, which serve as an indispensable energy source for various electronic devices in modern society, are seeing increased capacity requirements due to the growing usage and complexity of mobile devices and the development of electric vehicles. While multiple battery cells are arranged in small devices to meet user demand, vehicles utilize battery modules that electrically connect multiple battery cells, or battery packs equipped with multiple such modules.

[0005] Meanwhile, a battery cell, a battery module including a plurality of battery cells, and a battery pack including the battery module may experience a defect in which they expand beyond a standard value due to charging and discharging.

[0006] However, since the volume of battery cells and battery modules is measured directly by operators using vernier calipers, there is a problem in that the accuracy and efficiency of the measurements are reduced.

[0007] FIG. 1 is a perspective view showing a battery cell thickness measuring device according to the prior art. As shown in FIG. 1, the battery cell thickness measuring device according to the prior art comprises a mounting part (10) on which a battery cell (1) is placed, a moving part (20) for moving the mounting part (10), a pair of first frames (30) extended in a vertical direction, a second frame (40) provided to connect the pair of first frames (30), and a laser sensor (50) provided on the second frame (40) for measuring the thickness of the battery cell (1).

[0008] A battery cell thickness measuring device according to the prior art determines whether expansion occurs by measuring the thickness of the battery cell (1) at each position of the battery cell (1) mounted on the mounting part (10) through the movement of the first frame (30) or the mounting part (10).

[0009] However, battery cell thickness measuring devices according to such conventional technology have the problem that it is difficult to measure the thickness of secondary batteries with larger volumes, such as battery modules and battery packs, and even if measurement is possible, it is difficult to determine whether the battery cell has expanded in the width direction.

[0010] In addition, there is a problem that when the mounting part (10) moves, the position of the battery cell (1) that is seated may change due to vibrations generated during movement, which may reduce the reliability of the accurate thickness measurement result.

[0011] (Prior Art Literature)

[0012] (Patent Document 1) Korean Published Patent Application No. 2017-0103341

[0013] In order to solve the above-mentioned problems, the present invention aims to provide a secondary battery measuring device capable of simultaneously measuring the width and thickness of a secondary battery to improve measurement efficiency, and a secondary battery measuring method using the same.

[0014] In addition, the present invention aims to provide a secondary battery measuring device and a secondary battery measuring method using the same, which can obtain accurate measurement values ​​by preventing the measured secondary battery from moving and thereby suppressing the secondary battery from detaching from its seated position.

[0015] A secondary battery measuring device according to the present invention for achieving the above-mentioned purpose comprises: a mounting die (100) on which the secondary battery (C) is mounted; a pair of vertical frames (200) positioned at a certain distance from the upper surface of the mounting die (100) and extended in a certain length in the height direction (Z-axis direction); a horizontal frame (300) extended in a certain length and connected to each of the pair of vertical frames (200); a pair of width measuring sensors (400) each provided on the side of the pair of vertical frames (200); and a thickness measuring sensor (500) provided on the horizontal frame (200).

[0016] In addition, the secondary battery measuring device according to the present invention is characterized by having a blocking member (600) comprising a blocking wall (610) extending in the height direction (Z-axis direction) from three edge surfaces of the mounting die (100) and a flat blocking cover (620) connected to the upper part of the blocking wall (610).

[0017] In addition, the secondary battery measuring device according to the present invention is characterized in that an inflow detection sensor bar (700) extending a certain length in the height direction (Z-axis direction) is provided on both sides of the open surface of the blocking member (600).

[0018] In addition, in the secondary battery measuring device according to the present invention, the pair of inflow detection sensor bars (700) are characterized in that one side of the inflow detection sensor bar (700) irradiates a laser, and the other side of the inflow detection sensor bar (700) is a sensor that receives the laser.

[0019] In addition, in the secondary battery measuring device according to the present invention, the pair of width measuring sensors (400) and the thickness measuring sensors (500) are characterized as being laser sensors that irradiate a laser.

[0020] In addition, in the secondary battery measuring device according to the present invention, the vertical frame (200) is characterized by being able to move in the longitudinal direction (X-axis direction) of the mounting die (100).

[0021] In addition, in the secondary battery measuring device according to the present invention, the horizontal frame (300) is characterized by being movable in the height direction (Z-axis direction) along the vertical frame (200).

[0022] In addition, in the secondary battery measuring device according to the present invention, the pair of width measuring sensors (400) are characterized by being movable in the height direction (Z-axis direction) along the vertical frame (200).

[0023] In addition, in the secondary battery measuring device according to the present invention, the thickness measuring sensor (400) is characterized by being movable in the width direction (Y-axis direction) along the horizontal frame (300).

[0024] In addition, in the secondary battery measuring device according to the present invention, the barrier wall (600) is characterized by being made of a transparent material.

[0025] In addition, in the secondary battery measuring device according to the present invention, the material is characterized by comprising one or more of reinforced glass, acrylic, polyethylene (PE), polyethylene terephthalate (PET), and polyvinyl chloride (PVC).

[0026] In addition, the secondary battery measurement method according to the present invention is characterized by comprising: a first step of placing a secondary battery that has been charged and discharged at least once onto a mounting die; a second step of operating an inflow detection sensor bar provided at the corner of the mounting die; a third step of measuring the width and thickness of the secondary battery; and a fourth step of determining whether the secondary battery is defective through the measured values.

[0027] In addition, the secondary battery measurement method according to the present invention is characterized by stopping the measurement when the inflow of an object is detected by the inflow detection sensor bar.

[0028] As described above, according to the secondary battery measuring device for measuring the width and thickness of a secondary battery and the secondary battery measuring method including the same according to the present invention, the expansion of the secondary battery in the width direction and height direction can be simultaneously measured through a width measuring sensor and a thickness measuring sensor, thereby providing the advantage of improving the efficiency of the measurement operation.

[0029] In addition, according to the secondary battery measuring device for measuring the width and thickness of a secondary battery and the secondary battery measuring method including the same according to the present invention, there is an advantage that the reliability of the measurement value is improved because the expansion status can be measured while the secondary battery is seated at a designated position.

[0030] In addition, according to the secondary battery measuring device for measuring the width and thickness of a secondary battery and the secondary battery measuring method including the same according to the present invention, a barrier wall is provided to block the inflow of foreign matter from the outside, thereby providing the advantage of improving the reliability of the measurement value.

[0031] Furthermore, according to the secondary battery measuring device for measuring the width and thickness of a secondary battery and the secondary battery measuring method including the same, the device is equipped with an inflow detection sensor bar, so that measurement is stopped when the inflow of an object or a worker is detected, thereby having the advantage of preventing malfunctions caused by impact from an object and accidents involving workers.

[0032] FIG. 1 is a perspective view showing a battery cell thickness measuring device according to the prior art.

[0033] FIG. 2 is a perspective view showing a secondary battery measuring device according to a preferred embodiment of the present invention.

[0034] FIG. 3 is a perspective view showing the state in which the blocking member and the inflow detection sensor bar are disassembled in a secondary battery measuring device according to a preferred embodiment of the present invention.

[0035] FIG. 4 is a flowchart illustrating a secondary battery measurement method according to a preferred embodiment of the present invention.

[0036] FIG. 5 is a table comparing a comparative example and a secondary battery measurement method according to a preferred embodiment of the present invention.

[0037] Embodiments that enable a person skilled in the art to easily implement the present invention are described in detail below with reference to the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a specific description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description will be omitted.

[0038] In addition, the same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected, but also cases where they are indirectly connected with other elements in between. Furthermore, unless specifically stated otherwise, the inclusion of a certain component does not exclude other components but implies that additional components may be included.

[0039] Hereinafter, a secondary battery measuring device for measuring the width and thickness of a secondary battery according to the present invention and a secondary battery measuring method including the same will be described with reference to the attached drawings.

[0040] FIG. 2 is a perspective view showing a secondary battery measuring device according to a preferred embodiment of the present invention, and FIG. 3 is a perspective view showing a state in which a blocking member and an inflow detection sensor bar are disassembled in a secondary battery measuring device according to a preferred embodiment of the present invention.

[0041] Referring to FIGS. 2 and FIGS. 3, a secondary battery measuring device according to a preferred embodiment of the present invention comprises a mounting die (100), a vertical frame (200), a horizontal frame (300), a width measuring sensor (400), a thickness measuring sensor (500), a barrier wall (600), and an inflow detection sensor bar (700).

[0042] First, the mounting die (100) is configured to mount a secondary battery (C) that has been charged and discharged at least once, and the upper portion on which the secondary battery (C) is mounted is formed in a flat plate shape.

[0043] A pair of first guide rails (210) are formed on the upper surface at a certain distance apart and in the longitudinal direction (X-axis direction).

[0044] A pair of first guide rails (210) are connected to each of a pair of vertical frames (200) to guide the movement path when the vertical frames (200) move along the first guide rails (210) in the longitudinal direction (X-axis direction).

[0045] Meanwhile, the secondary battery (C) may be a battery cell, a battery module containing one or more battery cells, or a battery pack containing one or more battery modules.

[0046] Here, the battery cell may be a pouch-type battery cell. Such a battery cell comprises an electrode assembly, a pouch case housing the electrode assembly, an electrode lead protruding outward from the pouch case, and an insulating film located between the pouch case and the electrode lead.

[0047] The electrode assembly has a structure in which positive and negative electrodes are stacked alternately multiple times with a separator in between, and a pair of electrode leads, consisting of a positive lead and a negative lead, are electrically connected to the positive tab and the negative tab and then exposed to the outside of the pouch case.

[0048] The positive electrode is manufactured by applying a positive electrode composite containing a positive electrode active material onto a positive electrode current collector and then drying it, and the positive electrode composite may optionally further include a binder, a conductive agent, a filler, etc., as needed.

[0049] The positive current collector can generally have a thickness of 3 to 500 μm. Such a positive current collector is not particularly limited as long as it has high conductivity without causing chemical changes in the battery, and for example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel surface-treated with carbon, nickel, titanium, silver, etc. may be used. In addition, the positive current collector may form fine irregularities on its surface to increase the adhesion of the positive active material, and various forms such as films, sheets, foils, nets, porous bodies, foams, and nonwoven fabrics are possible.

[0050] As the positive electrode active material, layered compounds such as lithium cobalt oxide (LiCoO2) or lithium nickel oxide (LiNiO2), or compounds substituted with one or more transition metals; chemical formula Li 1+x Mn 2-xLithium manganese oxides such as O4 (where x is 0 to 0.33), LiMnO3, LiMn2O3, LiMnO2, etc.; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5, Cu2V2O7, etc.; chemical formula LiNi 1-x M x Ni-site type lithium nickel oxide represented by O2 (where M = Co, Mn, Al, Cu, Fe, Mg, B, or Ga, and x = 0.01 ~ 0.3); chemical formula LiMn 2-x M x Examples include lithium manganese complex oxides represented by O2 (where M = Co, Ni, Fe, Cr, Zn or Ta and x = 0.01 to 0.1) or Li2Mn3MO8 (where M = Fe, Co, Ni, Cu or Zn); LiMn2O4 in which part of the Li in the chemical formula is substituted with alkaline earth metal ions; disulfide compounds; Fe2(MoO4)3, but are not limited to these.

[0051] The cathode is manufactured by applying a cathode composite containing a cathode active material onto a cathode current collector and then drying it, and the cathode composite may include components such as a conductive agent, a binder, and a filler, as needed.

[0052] The negative electrode current collector is generally made with a thickness of 3 to 500 μm. Such a negative electrode current collector is not particularly limited as long as it has high conductivity without causing chemical changes in the battery, and for example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel surface treated with carbon, nickel, titanium, silver, etc., and aluminum-cadmium alloy may be used. In addition, similar to the positive electrode current collector, fine irregularities may be formed on the surface to strengthen the bonding strength of the negative electrode active material, and it may be used in various forms such as film, sheet, foil, net, porous body, foam, nonwoven fabric, etc.

[0053] The separator prevents a short circuit between the aforementioned cathode and anode and enables only the movement of lithium ions; an insulating thin film having high ion permeability and mechanical strength is used. The pore diameter of the separator is generally 0.01 to 10 μm, and the thickness is generally 5 to 300 μm. The material of such a separator is preferably selected from polyethylene, polypropylene, polyethylene / polypropylene double layer, polyethylene / polypropylene / polyethylene triple layer, polypropylene / polyethylene / polypropylene triple layer, and organic fiber filter paper, but is not limited thereto.

[0054] Meanwhile, the cathode current collector and the anode current collector are composed of a portion coated with a slurry mixed with an active material and a non-coated portion not coated with the slurry. Electrode tabs are formed by cutting the non-coated portion or by connecting a separate conductive member to the non-coated portion using ultrasonic welding, and these electrode tabs are assembled to form a tab bundle.

[0055] The pouch case may be formed using a laminate sheet composed of an inner coating layer, a metal layer, and an outer coating layer, with a pocket portion capable of accommodating an electrode assembly and an edge portion extending to a certain length on the outer side of one side of the pocket portion.

[0056] Since the inner coating layer comes into direct contact with the electrode assembly, it must possess insulation and electrostatic resistance. Additionally, to ensure sealing from the outside, the sealing area formed by the thermal bonding of the inner layers must have excellent thermal bonding strength.

[0057] The material for this inner coating layer may be selected from, but is not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which have excellent chemical resistance and good sealing properties; however, polypropylene is most preferable as it has excellent mechanical properties such as tensile strength, stiffness, surface hardness, and impact strength, as well as excellent chemical resistance.

[0058] The metal layer in contact with the inner coating layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a lightweight aluminum film with excellent formability can be used as a preferred material for this metal layer.

[0059] In addition, an outer coating layer is provided on the other side of the metal layer, and this outer coating layer may use a heat-resistant polymer with excellent tensile strength, moisture barrier properties, and air barrier properties to ensure heat resistance and chemical resistance while protecting the electrode assembly, and may use, for example, nylon or polyethylene terephthalate, but is not limited thereto.

[0060] In addition, a pair of electrode leads, consisting of a positive lead and a negative lead, are generally connected to the aforementioned electrode tab bundle, more specifically the positive tab bundle and the negative tab bundle by means such as welding, and then protrude to the outside of the pouch case.

[0061] The insulating film is positioned on the upper and lower surfaces of the electrode lead that overlap with the heat-fused pouch case sealing portion, and is configured to prevent electricity generated from the electrode assembly from flowing through the electrode lead to the pouch case and further maintain the sealing of the pouch case.

[0062] Here, it is preferable that the insulating film be a non-conductive material that does not conduct electricity well, and generally, an insulating tape that is easy to attach to the electrode lead and is relatively thin can be used.

[0063] Specifically, the insulating film may be any one or more materials selected from the group consisting of polyimide (PI), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polyvinyl chloride (PVC), high density polyethylene (HDPE), and epoxy resin, and is heat-fused and bonded to the inner resin layer of the pouch case through heat and pressure.

[0064] Although the description and drawings only describe a battery cell (100) having a structure in which electrode leads protrude in both directions on one side and the other side, as another embodiment of the present invention, a unidirectional pouch-type battery cell in which electrode leads protrude together in one direction can also be used.

[0065] Next, the vertical frame (200) is intended to support the horizontal frame (300), and is in the shape of a column with its lower end connected to the first guide rail (110) and extended a certain length in the height direction (Z-axis direction).

[0066] As described above, the vertical frame (200) is connected to the first guide rail (110) so that it can reciprocate along the first guide rail (110) in the longitudinal direction (X-axis direction) of the mounting die (100).

[0067] The vertical frame (200) has a second guide rail (210) and a third guide rail (220) formed on its side.

[0068] A second guide rail (210) is formed in the height direction (Z-axis direction) on each side of a pair of vertical frames (200), and can be formed on each side facing each other in a pair of vertical frames (200).

[0069] A horizontal frame (300) is connected to the second guide rail (210), and the rail guides the movement path when the horizontal frame (300) moves back and forth in the height direction (Z-axis direction).

[0070] The third guide rail (220) is formed on each side of a pair of vertical frames (200) and is a rail that guides the movement path when the width measuring sensor (400) moves back and forth in the height direction (Z-axis direction).

[0071] At this time, it is preferable that the second guide rail (210) and the third guide rail (220) be formed on different sides of the vertical frame (200), so as to prevent the horizontal frame (300) moving along the second guide rail (210) and the width measuring sensor (400) moving along the third guide rail (220) from colliding.

[0072] That is, the side on which the second guide rail (210) and the third guide rail (220) are formed can be changed so as to prevent the horizontal frame (300) and the width measuring sensor (400) from colliding.

[0073] Next, the horizontal frame (300) supports the thickness measuring sensor (500) so that it is positioned on the upper part of the secondary battery (C) to be measured for thickness, and has a shape that is extended by a certain length.

[0074] The horizontal frame (300) has both sides connected to the second guide rail (210) of a pair of vertical frames (200), and can reciprocate along the second guide rail (210) in the height direction (Z-axis direction).

[0075] A fourth guide rail (310) is formed on the side of the horizontal frame (300) and extends a certain length along the horizontal frame (300).

[0076] The fourth guide rail (310) is a rail to which a thickness measuring sensor (500) is connected, and which guides the movement path when the thickness measuring sensor (500) moves back and forth in the width direction (Y-axis direction).

[0077] The width measuring sensor (400) measures the width of the secondary battery (C) placed on the mounting die (100) and may be composed of a laser sensor that irradiates a laser.

[0078] The width measuring sensor (400) is positioned on the third guide rail (220) at a certain distance apart from each side of the secondary battery (C).

[0079] The width measuring sensor (400) measures the distance from the side of the secondary battery (C) to determine whether the secondary battery (C) is expanded in the width direction (Y-axis direction).

[0080] At this time, the width measuring sensor (400) can move along the third guide rail (220) in the height direction (Z-axis direction), and can determine whether expansion occurs at different heights from the side of the secondary battery (C), thus having the advantage of accurately measuring the location where expansion has occurred.

[0081] In addition, the width measuring sensor (400) can measure the degree of expansion at each location on the side of the secondary battery (C).

[0082] The thickness measuring sensor (500) measures the thickness of the secondary battery (C) placed on the mounting die (100) and may be composed of a laser sensor that irradiates a laser.

[0083] The thickness measuring sensor (500) is connected to the fourth guide rail (310) of the horizontal frame (300) and measures the distance from the upper surface of the secondary battery (C) to measure whether the secondary battery (C) is expanded in the height direction (Z-axis direction).

[0084] The thickness measuring sensor (500) can adjust its height direction (Z-axis direction) position by moving the horizontal frame (300) along the second guide rail (210) in the height direction (Z-axis direction).

[0085] This thickness measuring sensor (500) can adjust its height so that it can measure secondary batteries (C) of various thicknesses.

[0086] Additionally, the thickness measuring sensor (500) can move back and forth along the fourth guide rail (310) in the width direction (Y-axis direction), allowing the width direction (Y-axis direction) position to be adjusted.

[0087] At this time, the thickness measuring sensor (500) can move along the fourth guide rail (310) in the width direction (Y-axis direction) as described above, and can measure whether expansion occurs at each position in the width direction (Y-axis direction) on the upper surface of the secondary battery (C), thus having the advantage of accurately measuring the location where expansion has occurred.

[0088] In addition, the thickness measuring sensor (500) can measure the degree of expansion at each location on the upper surface of the secondary battery (C).

[0089] Next, the blocking member (600) blocks external objects, etc. from entering onto the mounting die (100) and is configured to include a blocking wall (610) and a blocking cover (620).

[0090] The barrier wall (610) is designed to block external objects, etc. from entering from a part of the side of the mounting die (100), and is shaped to extend a certain height in the height direction (Z-axis direction) from three edges of the mounting die (100).

[0091] That is, the barrier wall (610) has a shape in which one edge of the mounting die (100) is open.

[0092] The blocking cover (620) is intended to block external objects, etc. from entering from the upper part of the mounting die (100), and is formed in a flat plate shape connecting the upper part of the blocking wall (610).

[0093] The blocking member (600), composed of such a blocking wall (610) and a blocking cover (620), may be made of a transparent material so as to check the interior of the space enclosed by the blocking member (600).

[0094] That is, the blocking member (600) is made of a transparent material, so that the state of the components provided within the space formed by the blocking member (600) and the process of conducting the measurement can be checked.

[0095] At this time, the material may be composed of one or more of, for example, tempered glass, acrylic, polyethylene (PE), polyethylene terephthalate (PET), and polyvinyl chloride (PVC), and is not particularly limited as long as it is a material that has transparency and can maintain the shape of the blocking member (600).

[0096] The inflow detection sensor bar (700) is provided at each of the edges on both sides of the open surface of the blocking member (600) to detect external objects, etc., entering through the open surface of the blocking member (600).

[0097] The inflow detection sensor bar (700) may be in the shape of a bar extended for a certain length in the vertical direction (Z-axis direction).

[0098] An inflow detection sensor bar (700) located on one side is a device that irradiates a laser, and an inflow detection sensor bar (700) located on the other side may be a sensor that receives the laser.

[0099] Such an inflow detection sensor bar (700) can detect when an object or worker enters and stop the measurement operation, thereby preventing safety accidents.

[0100] FIG. 4 is a flowchart illustrating a secondary battery measurement method according to a preferred embodiment of the present invention.

[0101] Referring to FIG. 4, a secondary battery measurement method according to a preferred embodiment of the present invention comprises a first step of placing a secondary battery that has been charged and discharged at least once onto a mounting die, a second step of operating an inflow detection sensor bar provided at the corner of the mounting die, a third step of measuring the width and thickness of the secondary battery, and a fourth step of determining whether the secondary battery is defective based on the measured values.

[0102] First, the first step of mounting a secondary battery that has been charged and discharged at least once onto a mounting die is to insert the secondary battery that has been charged and discharged at least once into the open surface of a blocking member and mount it onto the mounting die.

[0103] At this time, the secondary battery may be a battery cell, a battery module including a plurality of battery cells, or a battery pack including a plurality of battery modules.

[0104] The second step of operating the inflow detection sensor bar provided at the corner of the mounting die is to detect the inflow of an object or worker through the open surface of the blocking member by operating the inflow detection sensor bar.

[0105] In this case, if the inflow detection sensor bar detects the entry of an object or worker after activation, it stops the measurement process to prevent safety accidents caused by the inflow.

[0106] The third step of measuring the width and thickness of a secondary battery is to measure the width and thickness of a secondary battery that has been charged and discharged at least once using a width measuring sensor and a thickness measuring sensor to determine whether there is expansion and the location where expansion has occurred.

[0107] More specifically, the vertical frame moves along the first guide rail of the mounting die, and through this movement, the width measuring sensor moves along the longitudinal direction of the secondary battery.

[0108] With the movement of this vertical frame, the width measuring sensor can measure the side of the secondary battery in the longitudinal direction to check whether it has expanded and the location of the expansion.

[0109] At this time, the width measuring sensor can reciprocate along the third guide rail of the vertical frame, allowing the width measuring sensor to measure whether there is expansion in the height direction of the side of the secondary battery and the location where expansion occurs.

[0110] In addition, the vertical frame moves along the first guide rail of the mounting die, and this movement causes the thickness measuring sensor to move along the longitudinal direction of the secondary battery.

[0111] With the movement of this vertical frame, the thickness measuring sensor can measure the upper surface of the secondary battery in the longitudinal direction to check for expansion and the location of expansion.

[0112] At this time, the thickness measuring sensor can reciprocate along the fourth guide rail of the horizontal frame, allowing the thickness measuring sensor to measure in the width direction of the upper surface of the secondary battery.

[0113] In other words, the thickness measuring sensor can measure the entire upper surface of the secondary battery and accurately measure whether there is expansion and the location where expansion occurs on the upper surface of the secondary battery.

[0114] The fourth step, which determines whether the secondary battery is defective based on measured values, is a step of confirming whether the secondary battery has expanded and the location of expansion, and determining whether it is defective, based on the measurements obtained through the width measurement sensor and the thickness measurement sensor.

[0115] FIG. 5 is a table comparing a comparative example and a secondary battery measurement method according to a preferred embodiment of the present invention.

[0116] Referring to Fig. 5, in the comparative example performed in the past, when measuring whether the secondary battery is expanded, two workers manually measure whether the secondary battery is expanded using vernier calipers.

[0117] In this comparative example, it takes an average of 1 hour to measure whether the secondary battery has expanded, store the measured value, and determine whether it is defective.

[0118] In addition, measurements are taken at intervals of 20mm, and it is difficult to perform measurements at the same location when performing repeated measurements.

[0119] In contrast, the secondary battery measurement method according to the present invention is performed automatically through a device, so one operator can perform the measurement process.

[0120] In addition, measurements are taken quickly using an automatic measuring device, and the measured value can be saved and the expansion status determined simultaneously with the measurement, so the work time takes an average of 10 minutes.

[0121] In the case of measurement intervals, it can be performed in units of 5mm or less, allowing for more precise measurement.

[0122] In addition, there is an advantage in that measurements can be performed at the same location during initial or multiple measurements through position movement and coordinate mapping by the device.

[0123] A person skilled in the art to which this invention pertains will be able to perform various applications and modifications within the scope of this invention based on the above content.

[0124] (Explanation of symbols)

[0125] 100: Settling Die

[0126] 110: First guide rail

[0127] 200: Vertical frame

[0128] 210: Second guide rail

[0129] 220: Third guide rail

[0130] 300: Horizontal frame

[0131] 310: 4th guide rail

[0132] 400: Width measuring sensor

[0133] 500: Thickness measuring sensor

[0134] 600: Blocking member

[0135] 610: Barrier wall

[0136] 620: Blocking cover

[0137] 700: Inflow detection sensor bar

[0138] C: Secondary battery

Claims

A secondary battery measuring device for inspecting a secondary battery that has been charged and discharged 1.1 times or more, A mounting die on which the above secondary battery is mounted; A pair of vertical frames positioned at a certain distance apart from the upper surface of the above-mentioned mounting die and extending a certain length in the height direction; A horizontal frame that is extended to a certain length and connected to each of the pair of vertical frames; A pair of width measuring sensors each provided on the side of the pair of vertical frames; and A secondary battery measuring device characterized by including a thickness measuring sensor provided on the horizontal frame.

2. In Paragraph 1, A secondary battery measuring device characterized by having a blocking member comprising a blocking wall extending in the height direction from three sides of the edge of the above-mentioned mounting die and a flat-plate shaped blocking cover connected to the upper part of the blocking wall.

3. In Paragraph 2, A secondary battery measuring device characterized by having inflow detection sensor bars extended a certain length in the height direction on both sides of the open surface of the above-mentioned blocking member.

4. In Paragraph 3, A secondary battery measuring device characterized in that the above pair of inflow detection sensor bars is a sensor in which one side of the inflow detection sensor bar irradiates a laser and the other side of the inflow detection sensor bar receives the laser.

5. In Paragraph 2, A secondary battery measuring device characterized in that the above pair of width measuring sensors and the above thickness measuring sensors are laser sensors that irradiate a laser.

6. In Paragraph 2, A secondary battery measuring device characterized in that the above vertical frame can move in the longitudinal direction of the above mounting die.

7. In Paragraph 6, A secondary battery measuring device characterized in that the horizontal frame is movable in the height direction along the vertical frame.

8. In Paragraph 2, A secondary battery measuring device characterized in that the above pair of width measuring sensors are capable of moving in the height direction along the vertical frame.

9. In Paragraph 2, A secondary battery measuring device characterized in that the thickness measuring sensor is capable of moving in the width direction along the horizontal frame.

10. In Paragraph 2, A secondary battery measuring device characterized in that the above-mentioned blocking member is made of a transparent material.

11. In Paragraph 10, A secondary battery measuring device characterized by the above material comprising one or more of tempered glass, acrylic, polyethylene (PE), polyethylene terephthalate (PET), and polyvinyl chloride (PVC).

12. A method for measuring a secondary battery using a secondary battery measuring device described in any one of claims 1 to 11, A first step of mounting a secondary battery that has been charged and discharged at least once onto a mounting die; A second step of operating an inflow detection sensor bar provided at the corner of the above-mentioned mounting die; A third step of measuring the width and thickness of the secondary battery; and A secondary battery measurement method characterized by including a fourth step of determining whether the secondary battery is defective based on the measured value.

13. In Paragraph 12, A secondary battery measurement method characterized by stopping measurement when the inflow of an object is detected by the inflow detection sensor bar.

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