WO2019004728A1 - 굴곡 지그를 포함하는 지그 조립체, 이를 포함하는 굴곡 인장강도 측정 장치 및 이를 이용한 굴곡 인장강도 측정 방법 - Google Patents

굴곡 지그를 포함하는 지그 조립체, 이를 포함하는 굴곡 인장강도 측정 장치 및 이를 이용한 굴곡 인장강도 측정 방법 Download PDF

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Publication number
WO2019004728A1
WO2019004728A1 PCT/KR2018/007302 KR2018007302W WO2019004728A1 WO 2019004728 A1 WO2019004728 A1 WO 2019004728A1 KR 2018007302 W KR2018007302 W KR 2018007302W WO 2019004728 A1 WO2019004728 A1 WO 2019004728A1
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WO
WIPO (PCT)
Prior art keywords
specimen
jig
tensile strength
bending
electrode
Prior art date
Application number
PCT/KR2018/007302
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English (en)
French (fr)
Korean (ko)
Inventor
정안수
김영태
김남원
김민규
박필규
송한갑
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020180070300A external-priority patent/KR102197351B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to US16/342,860 priority Critical patent/US10996150B2/en
Priority to EP18823769.7A priority patent/EP3531107B1/en
Priority to CN201880004186.4A priority patent/CN109923395B/zh
Publication of WO2019004728A1 publication Critical patent/WO2019004728A1/ko

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0278—Thin specimens
    • G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes

Definitions

  • cracks may be generated in the positive electrode 31 and the negative electrode 33.
  • cracks include cracks in the active material layer, cracks in the current collector sheet, and disconnection of the electrodes (including partial disconnection).
  • the disconnection is critical to the performance of the battery and must be managed with great care. Therefore, it is necessary to determine the winding radius, particularly the radius R of the core 60, so that the battery volume does not increase unnecessarily without generating cracks, and accordingly, the winding tension must also be determined.
  • the angle between the specimen coming down from the pedestal and the bending jig may be 0 to 10 °.
  • FIG. 3 is a schematic view of a jig assembly and a bending tensile strength measuring apparatus including the same according to an embodiment of the present invention.
  • tensile strength, flexural strength, bending strength and compressive strength are known in measuring the mechanical strength of a material.
  • the value obtained by dividing the maximum tensile load until the specimen breaks in the tensile test of the material divided by the cross-sectional area (or length) of the specimen before the test is the tensile strength.
  • the present invention proposes a new apparatus and method which are merely different from the apparatus and method for simply measuring the tensile strength, and the apparatus and method for measuring the bending strength, and are not a combination of them. It is not possible to combine the measurement of the bending strength and the measurement of the tensile strength since it is meaningless to measure the bending strength of the electrode including the electrode current collector for the reasons mentioned above. It should be noted that the present invention is not by its combination.
  • the fixing portion (150) One end (110a) of the test piece (110) is fixed by the fixing portion (150).
  • the fixing method is not particularly limited, and for example, taping, adhesive, welding, and screws can be applied.
  • the bending jig 120 causes bending of the test piece 110 between one end 110a and the other end 110b of the test piece 110. [ Then, the bending jig 120 guides the other end 110b of the specimen 110 toward the load side of the tensile test.
  • the other end 110b of the test piece 110 is connected to a tensile strength measuring instrument 190 suitable for providing a tensile test load portion and is subjected to a force pulled in the direction of the arrow shown in Fig.
  • the bent jig 120 has a flat rectangular parallelepiped shape, and the narrow jig 120 is arranged so as to form a bottom surface.
  • the bottom surface is a surface placed in a direction opposite to the direction in which the tensile strength measuring instrument 190 pulls the test piece 110 and refers to a direct portion that causes the test piece 110 to bend.
  • the shape of the bending jig 120 is not particularly limited. However, when the bending jig 120 is manufactured in the form of a rod like a cylindrical mandrel, the bending jig 120 may be bent during measurement of tensile strength due to low strength. Therefore, It is preferable to produce a plate having a constant thickness T as described above.
  • the other end portion 110b of the test piece 110 is suitable for sending the test piece 110 to the tensile test load portion by attaching the test piece 110 to the plate, It is suitable for guiding.
  • the bending jig 120 is disposed so as to be narrow and long side down so that the distal end F of the bottom surface that generates narrow and long sides of the bending jig 120, that is, the bending of the test piece 110, is a semi-sphere, Or may have the form of a semi-polygonal column. Therefore, the tip F in the length direction (H) direction of the bending jig 120 may be semicircular or semi-polygonal.
  • the bottom surface of the bending jig 120 that meets with the side surfaces of the bending jig 120 is formed in the same shape as the corner of the bending jig 120. In this case, It is difficult to accurately measure the tensile strength.
  • the radius or size (the longest length from the semicircular or semi-polygonal center to the semicircular or semi-polygonal outer periphery) of the tip of the distal end F of the bottom of the bending jig 120 is a semicircular or semi- It is preferable that they are manufactured in dimensions similar to the core for manufacturing. Most preferably the same dimensions. In this embodiment, for example, a case where a cross-section of the tip end (F) of the bottom surface of the bending jig 120 is a semicircular shape having a radius equal to the core radius R is shown.
  • the radius or size of the end face (F) cross section can be adjusted differently depending on the thickness of the specimen to be measured, the type of the active material, and the like, but it may generally be in the range of 0.25 mm to 0.5 mm. And may range from 0.5 mm to 1.0 mm in terms of diameter.
  • the bending jig 120 is used to generate the bending of the specimen 110 and the tensile strength is measured, the noise of the measured value can be minimized and the tensile strength can be appropriately measured.
  • the radius or size of the end face (F) cross section is smaller than 0.25 mm, there is a problem that the damage to the electrode is increased and the accuracy of measured value is decreased.
  • the radius or size is larger than 0.5 mm, A problem may arise.
  • the end portion 110a of the test piece 110 may be fixed by using the fixing portion 150 of the jig assembly 185 to measure the tensile strength of the test piece 110 while the test piece 110 is bent,
  • the tensile strength measuring device 190 is connected to the other end 110b of the test piece 110 after the test piece 110 passes under the tip F of the bending jig 120 of the jig assembly 185, 110) can be pulled slowly.
  • the tensile force is applied to the specimen 110, the specimen 110 is first bent by the tip portion F, and is continuously pulled in contact with one side of the bending jig 120.
  • the tensile strength is calculated from the force when the specimen 110 is broken.
  • the tensile strength measuring instrument 190 is connected to the other end 110b of the specimen 110 set to be passed through the bottom surface of the bending jig 120 of the jig assembly 185 to provide a tensile test load in the vertical direction.
  • the tensile strength measuring instrument 190 for this purpose may be, for example, a universal testing machine such as a TA (Tension Annealing) device or a UTM (Universal Testing Machine).
  • UTM is a universal device widely used for measuring mechanical properties
  • INSTRON UTM is representative.
  • the UTM can carry out standardized tests to be carried out by exchanging only the grips for fixing the specimen according to the test.
  • UTM can perform various physical properties tests of specimens. It can measure various physical properties such as tensile strength, flexural strength, compressive strength, peel strength, COF (static friction, kinetic friction coefficient), IFD, ILD W, and other various data can be measured.
  • the tensile strength measuring instrument 190 shown in Fig. 5 is a kind of UTM apparatus.
  • the tensile strength measuring instrument 190 is a hydraulic UTM capable of applying a test load to a specimen.
  • a hydraulic UTM may be a digit display method in which the measurement value of a load applied to a specimen is indicated by a guide, an analog guiding method, or a load cell which is an electronic sensitive device and a digit display unit by using a potentiometer.
  • the tensile strength measuring instrument 190 may include a load section 191 and a control and analysis section 199.
  • the loading portion 191 is disposed on the bed 192 with a table 193, a lower crosshead 194 and an upper crosshead 195.
  • the table 193 is operated upward by a hydraulic cylinder and the lower crosshead 194 is moved up and down along a vertical screw bar 196 operated by the motor and the upper crosshead 195 is moved up and down by a table 193 ) In the upward direction.
  • Grips for fixing the specimen can be mounted on the upper and lower crossheads 194 and 195.
  • Specimens for tensile strength testing are usually fixed between the upper and lower crossheads 194 and 195, )
  • the lower crosshead 194 a test piece for compressive strength and bending strength test is fixed and used for each test.
  • the control and analysis unit 199 receives various data such as the hydraulic cylinder and various devices for controlling the operation of the motor, load and specimen displacement by the load unit 10, analyzes it according to a test analysis program, And a computer device for displaying on the display device.
  • the tensile strength measuring instrument 190 is capable of applying a vertical load to the specimen while the upper and lower crossheads 194 and 195 are lifted or lowered to test tension, compression, bending, and the like.
  • the jig assembly 185 may be installed between the lower crosshead 194 and the upper crosshead 195 of the tensile strength measuring apparatus 190 shown in FIG. Between the lower crossheads 194, the bending tensile strength measurement can be performed.
  • the jig assembly 185 is fixed on the lower crosshead 194 of the tensile strength measuring instrument 190 as shown in FIG. 3 and the other end 110b of the test piece 110 is fixed to the upper crosshead 195 to lift the upper crosshead 195 upward in accordance with the upward movement of the table 193 to pull the other end 110b of the specimen 110 to measure the force at the time of fracture and calculate The tensile strength can be obtained.
  • the control and analysis unit 199 of the tensile strength measuring apparatus 190 calculates the tensile strength at the time when the specimen 110 is broken while pulling the other end 110b of the specimen 110 upward. At this time, the other end 110b of the test piece 110 and the tensile strength measuring instrument 190 are connected with a grip made of a rubber material, thereby minimizing the measurement value deviation due to the power loss.
  • a vertical force is applied to the specimen 110 until the time when the specimen 110 is broken and the tensile strength is calculated from the force at the time when the specimen 110 is broken.
  • the tensile strength thus measured that is, the bending tensile strength, which is a new parameter, can be used to confirm the physical properties of the specimen 110.
  • the method of measuring the bending tensile strength according to the present invention can be used for preliminarily verifying the suitability for use of the electrode and the winding condition of the electrode assembly by first simulating the winding situation.
  • the end of the distal end F of the bottom surface of the bending jig 120 is a semicircular shape having a radius equal to the core radius R, by simulating the conditions of winding conditions already established.
  • the load applied to the test piece 110 by the tensile strength measuring instrument 190 or the pulling speed of the test piece is set in consideration of the winding tension. If it is judged that sufficient tensile strength can not be ensured enough to enable winding when the bending tensile strength is measured under such conditions, it is judged that the electrode is not suitable for use in the winding electrode assembly. In this case, change the electrode manufacturing recipe or examine introduction of a new specification electrode.
  • the present invention is used to adjust the core radius and / or the winding tension.
  • Another bending jig having a tip having a dimension corresponding to the changed radius of the core is used and the bending tensile strength measurement is made by pulling the test piece 110 at a different load and / or other speed corresponding to the changed wrapping tension. The measurement conditions may be changed and the test repeated until the desired level of results is obtained, finally determining the appropriate winding radius and / or the winding tension.
  • the present invention can also be applied to check the time when cracks occur according to the bending level, in addition to the use of such pre-verification.
  • various levels of bending level can be provided, and the time of occurrence of the crack can be confirmed.
  • the present invention can also be used for the specification of the electrode properties according to the above.
  • an electrode suitable for secondary cell fabrication can specify how much tensile strength should be measured when measuring the bending tensile strength at a particular core radius.
  • the electrode is manufactured through the established regular electrode manufacturing process, and the measurement method according to the present invention is performed for the quality inspection of the produced electrode, thereby determining whether the electrode satisfies the specification. Electrodes that deviate from the specification are then excluded from the assembly process and begin investigating the cause of deviations from the specification. For example, it is possible to find out which line in the established manufacturing process the variable has generated, and to find out and correct the cause.
  • the present invention can also be utilized to exclude electrodes that deviate from specifications in the specification and the later inspection.
  • the structure of the flexural tensile strength measuring device 100 is simple, but its use goes beyond the expectations of those skilled in the art. Therefore, the meaning of the bending tensile strength as a new parameter of the electrode evaluation is outstanding.
  • the test piece 110 to which the one end portion 110a is fixed is connected to the tensile strength measuring device 190 in such a manner that the test piece 110 passes through the bottom surface of the bending jig 120 and contacts one surface of the bending jig 120
  • the test piece 110 and the bending jig 120 are completely in close contact with each other so that the angle between the test piece 110 and the bending jig 120 is 0 ° so as to be as close as possible to the situation in which the sheet- And the bending jig 120 according to the embodiment of the present invention. This will be further described in the following embodiments.
  • FIG. 6 is a perspective view of a jig assembly according to another embodiment of the present invention
  • FIG. 7 is a top view
  • FIG. 8 is a side view.
  • the jig assembly 285 includes a bending jig 120 'substantially similar to the bending jig 120 of the jig assembly 185 in the bending tensile strength measuring apparatus 100 described in the previous embodiment. Only the upper surface of the bending jig 120 'has been structurally changed in consideration of the structural relationship with other members for fixing the bending jig 120'.
  • the fixing portion 150 of the jig assembly 185 is deformed into the fixing portion 250.
  • a new tensile strength measuring apparatus (200 of FIG. 11 to be described later) is used, including a tensile strength measuring apparatus 190 of the bending tensile strength measuring apparatus 100, ) Can be implemented.
  • the jig assembly 285 includes a lower fixation die 202.
  • the lower fixing die 202 is formed in a substantially rectangular plate shape and has a groove 206 into which the lower plate 204 can be inserted and a fixing hole 208 is held at the bottom of the groove 206.
  • a hexagonal socket bolt 209 can be used to fix the lower fixture die 202 and the lower plate 204.
  • the jig assembly 285 is firmly fixed to the work table such as the table 193 or the lower crosshead 194 of the tensile strength measuring instrument 190 as shown in Fig. It is possible to position the jig assembly 285 without jolting even by repeating it several times.
  • the lower plate 204 is a base on which the mechanical structure of the jig is implemented in earnest.
  • the lower plate 204 is provided with a support table 230.
  • the support table 230 fixes the bending jig 120 'at both ends of the bending jig 120'.
  • the bending jig 120 ' is fixed by the support bars 230 on both sides, and the bottom surface of the bending jig 120' is designed not to touch the bottom plate 204. That is, it is installed at a position where the specimen passes through the bottom surface of the bending jig 120 'and does not cause unnecessary friction.
  • the manner in which the support table 230 fixes the bending jig 120 ' is not particularly limited.
  • the support base 230 includes a block 232 installed on the lower plate 204, a jig fixing block 234 installed on the block 232, and a bending jig 120 ' 234, and then to be fixed.
  • a hexagonal socket bolt 238 can be used for fixing the block 232 and the jig fixing block 234.
  • the block 232, the jig fixing block 234 and the butterfly bolt 236 are provided as a pair to support the bending jig 120 'from both sides.
  • a slot 235 is formed in which the bending jig 120 'can be inserted.
  • the bending jig 120 'can be firmly fixed to the inner surface of the slot 235 by inserting the bending jig 120' into the slot 235 and then tightening the wing bolt 236.
  • the pedestal 251 is for fixing one end of the specimen and is provided on the lower plate 204 on the side opposite to the support table 230 and is not particularly limited in terms of material. However, it is preferable that the edge of the pedestal 251, which is in contact with the specimen, is subjected to rounding treatment so that unnecessary force is not applied to the specimen due to the edge of the pedestal 251.
  • the pedestal 251 is a member in which one end of the specimen is placed so that one end of the specimen is positioned above the bottom surface of the bending jig 120 '.
  • the fixing plate 240 fixes one end of the specimen to the pedestal 251.
  • the clamping plate 240 basically includes a clamp block 241 for directly pressing one end of the specimen and may include a toggle clamp 245 for applying a force thereto.
  • the toggle clamp 245 is a mechanism for applying a small force to act on the clamp block 241 with a large force.
  • a connection portion 242 between the clamp block 241 and the toggle clamp 245 is formed.
  • the connecting portion 242 may include a clamp pin, a spring, an E-shaped snap ring, and the like.
  • the E-type snap ring is a ring that is held in place by force and snug fit.
  • the toggle clamp 245 is raised, (241) is spaced apart from the pedestal (251).
  • the toggle clamp 245 is lowered to place the clamp block 241 of the clamping plate 240 on one end of the specimen,
  • the clamp block 241 of the clamping plate 240 is moved further downward by adjusting the clamping blocks 260 and 260 'so that one end of the specimen is pressed by the clamp block 241 of the clamping plate 251 and the clamping plate 240, So as not to move.
  • the fixing unit 250 of this embodiment corresponds to the fixing unit 150 described in the previous embodiment, such as the pedestal 251, the fixing plate 240, the screws 260 and 260 ', and the like.
  • it may further include a sample position center setting jig 270, 270 'for positioning the sample center position while being positioned on the fixing plate 240.
  • a sample position center setting jig 270, 270 ' for positioning the sample center position while being positioned on the fixing plate 240. If the thickness of the specimen is reduced by micrometer unit, bending occurs well enough to cause deflection due to its own load and it may become difficult to position. And, it is necessary that the specimen fixation position should be constant so that repeated experiment can always be the same experiment condition.
  • the present invention is provided with a sample positioning center setting jig 270, 270 '. Positioning the specimen between the specimen position centering jigs 270 and 270 'can always keep the specimen center position constant.
  • a handle 280 may be further provided to facilitate movement of the jig assembly 285.
  • the handle 280 may be provided on the pedestal 251, for example.
  • the handle 280 is provided in the vertical fixing block 252 in particular.
  • the method of measuring the bending tensile strength by using the jig assembly 285 together with the tensile strength measuring instrument 190 is not largely different from the method using the bending tensile strength measuring apparatus 100 described above, The jig assembly 285 will be described in more detail with reference to FIG.
  • FIG. 9 is a schematic view showing steps of a method for measuring a bending tensile strength using the jig assembly of FIG. 6;
  • Figs. 10 and 11 are perspective views of the jig assembly of Fig. 6 after setting the electrode specimen.
  • Fig. FIG. 12 is a side view of the state of FIG. 11, and is a schematic view showing the jig assembly of FIG. 6 and a bending tensile strength measuring apparatus including the same.
  • a specimen 110 having one end 110a and the other end 110b is prepared as shown in FIG. 9 (a).
  • the end portion 110a of the test piece 110 is fixed between the pedestal 251 of the jig assembly 285 and the fixed plate 240 as shown in FIG.
  • the toggle clamp 245 lever is raised, the clamp block 241 goes up.
  • the clamp block 241 can be lowered and the one end 110a of the test piece 110 can be fixed .
  • the specimen 110 is pulled out under the bending jig 120 '.
  • the test piece 110 is disposed so as to be in contact with one surface of the bending jig 120 'through the bottom surface of the bending jig 120', and then the other end 110b of the test piece 110 is measured with a tensile strength measuring apparatus 5 and 12, 190).
  • the test piece 110 may be lifted up and connected to the tensile strength measuring instrument 190 so as to wind the bending jig 120 '.
  • Figs. 10 and 11 show a state in which the setting of the specimen 110 is completed.
  • 9 (b) to 9 (d) for convenience of illustration, not only the respective members are shown schematically but also the position of the center of the specimen setting jigs 270 and 270 'is not shown. However, So that the test piece 110 is set in a state where the test pieces 270 and 270 'are positioned. On the other hand, even when the width of the test piece 110 is wide as shown in FIG. 11, it can be set in the same manner as in FIG.
  • a force is applied to the specimen 110 by holding the other end 110b of the specimen 110 using the tensile strength measuring instrument 190 until the time when the specimen 110 is broken, Measure the electrode properties.
  • the upper surface of the horizontal fixing block 254 of the pedestal 251 is located higher than the bottom surface of the bending jig 120 '. 12, the specimen 110 having the one end portion 110a fixed between the pedestal 251 and the fixed plate 240 passes through the bottom surface of the bending jig 120 ' A certain angle? Is formed between one surface of the bending jig 120 'and the specimen 110 coming down from the pedestal 251 when the bending jig 120' is connected to the tensile strength measuring device 190.
  • the angle may be as exemplified in the previous embodiment, and theoretically, it is most preferable to be 0 [deg.], But it is preferable that the angle is in the range of 0 to 10 [deg.] Considering an allowable tolerance range, cost, When the angle is larger than 10 DEG, it is difficult to obtain an accurate measurement value.
  • LiCoO 2 was used as a cathode active material, and carbon black as a conductive material, PVdF as a binder, and Li 2 Co 2 as an additive were mixed in a weight ratio of 97.2: 0.9: 1.5: 0.4, and then N-methyl-2-pyrrolidone NMP) to prepare a cathode active material slurry.
  • the prepared slurry was coated on one side of an aluminum foil, followed by drying and rolling to prepare a first electrode.
  • a second electrode was also prepared in which an excessive force was applied to the first electrode to artificially generate a crack.
  • the coating thickness of the slurry of the cathode active material is 200 ⁇ m
  • the first electrode is rolled to have a thickness of 150 ⁇ m
  • the second electrode is coated with a larger force so as to have a thickness of 140 ⁇ m. You can prepare.
  • Specimens were prepared by punching the first electrode and the second electrode to a predetermined size using a tensile punching machine.
  • the center specimen 1 was punched eight times in the size of 20 mm x 100 mm at the center of the first electrode.
  • the side specimen 1 was punched eight times in the size of 20 mm x 100 mm from the edge portion of the first electrode.
  • the center specimen 2 was punched eight times in a size of 20 mm x 100 mm in the middle portion of the second electrode.
  • the side specimen 2 was punched out at a size of 20 mm x 100 mm at the edge portion of the second electrode.
  • the bending tensile strength of the specimens was measured using the bending tensile strength measuring apparatus 200 of the present invention.
  • the diameter of the tip F of the bending jig 120 ' is 0.96 mm.
  • the radius is 0.48 mm, which is a value within the 0.25 to 0.5 mm radius range condition.
  • INSTRON UTM equipment was used as the tensile strength measuring instrument (190), and the specimen was mounted on the UTM equipment, and then the tensile strength was measured by pulling the specimen under the TA (Tension Annealing) speed of 50 mm / min. And then calculated.
  • the angle? Between the test piece descending from the pedestal 251 and one surface of the bending jig 120 ' was set at 5 °. This is a numerical value within the range of 0 to 10 degrees.
  • Tables 1 and 13 graphs The measured results are shown in Tables 1 and 13 graphs.
  • the values in Table 1 represent the tensile strength (gf / mm) and the average of the eight specimens is shown in Fig.
  • the center specimens 2 and the side specimens 2 obtained from the second electrodes that were artificially cracked were found to be in the range of 16 to 24 % Lower tensile strength.
  • the first electrode in the normal state is an electrode satisfying the specification and the second electrode in which the crack is generated is an electrode that is out of specification. It can be confirmed that the device for measuring the bending tensile strength according to the present invention can discriminate between these two electrodes.

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PCT/KR2018/007302 2017-06-29 2018-06-27 굴곡 지그를 포함하는 지그 조립체, 이를 포함하는 굴곡 인장강도 측정 장치 및 이를 이용한 굴곡 인장강도 측정 방법 WO2019004728A1 (ko)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US16/342,860 US10996150B2 (en) 2017-06-29 2018-06-27 Jig assembly comprising bending jig and apparatus and method for measuring bending tensile strength using the same
EP18823769.7A EP3531107B1 (en) 2017-06-29 2018-06-27 Jig assembly comprising bending jig and apparatus and method for measurng bending tensile strenght using the same
CN201880004186.4A CN109923395B (zh) 2017-06-29 2018-06-27 包括弯曲夹具的夹具组件及利用其测量弯曲抗张强度的设备和方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2017-0082738 2017-06-29
KR20170082738 2017-06-29
KR10-2018-0070300 2018-06-19
KR1020180070300A KR102197351B1 (ko) 2017-06-29 2018-06-19 굴곡 지그를 포함하는 지그 조립체, 이를 포함하는 굴곡 인장강도 측정 장치 및 이를 이용한 굴곡 인장강도 측정 방법

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