Fixture assembly including bending jig and apparatus and method for measuring bending tensile strength using the same

Abstract

Provided are a jig assembly for measuring the tensile strength of an electrode when it is bent at a radius similar to that of a core, an apparatus for measuring the bending tensile strength including the jig assembly, and an electrode for measuring the bending tensile strength using the apparatus for measuring the bending tensile strength with the core A method of measuring flexural tensile strength when the portion is bent to a similar radius. The jig assembly of the present disclosure includes: a fixing unit that fixes one end of a sample; and a plate-shaped bending jig that causes a little bending in a longitudinal section of the sample whose one end is fixed, and guides the side of the sample. The other end faces the tensile test load cell. According to the present disclosure, the tensile strength of the electrode can be measured under conditions similar to the winding process before the electrode is used in the actual winding application.

Description

technical field [0001] The present disclosure relates to an apparatus and method for measuring tensile strength, and more particularly, to a jig assembly required for measuring bending tensile strength as a new parameter for evaluating electrodes of secondary batteries, including measurement of the jig assembly Apparatus for flexural tensile strength and method for measuring flexural tensile strength using the apparatus. This application claims the priority of Korean Patent Application No. 10-2017-0082738 filed in Korea on June 29, 2017 and Korean Patent Application No. 10-2018-0070300 filed in Korea on June 19, 2018, which The disclosures of both Korean patent applications are incorporated herein by reference. Background technique [0002] In general, secondary batteries can be classified into a can type in which an electrode assembly is embedded in a cylindrical or prismatic metal can and a pouch type in which an electrode assembly is embedded in a pouch-shaped case of an...

AI Technical Summary

Problems solved by technology

[0011] However, because the pencil angle and pencil surface setting are determined by the measurer, the pencil hardness tester has large errors even in tests using the same coating

A nanoindenter uses a nanotip to press into the coating to measure hardness or elastic modulus, so when the nanotip is set on the concave and convex parts of the coating surface, the results are reversed, resulting in large errors

In the case of DMA where the elastic modulus is measured by clamping both ends of the coating and moving it up and down, the elastic modulus does not represent the properties of the entire structure including the coating and even the underlying layer, depending on the thickness, there are large variations in the resulting values difference, the measurement takes a lot of time, and there are large errors even in the same sample, making it difficult to achieve the specification (specification), and the high price of the equipment itself makes it difficult to use in the actual process

[0012] Most importantly, because it is difficult to obtain results representing the properties of the entire electrode including not only the active material layer but also the current collector even when testing on the active material layer using a conventional pencil hardness tester, nanoindenter, and DMA, the There are restrictions

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