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KR-102964327-B1 - Apparatus and method capable of simultaneously measuring electrode length and meandering

KR102964327B1KR 102964327 B1KR102964327 B1KR 102964327B1KR-102964327-B1

Abstract

The present invention relates to a measuring device capable of simultaneously measuring the length and meandering of an electrode for manufacturing a cylindrical battery, characterized by comprising: a cylindrical roll for winding a measuring electrode slit to a certain size; a length measuring unit for measuring the length of the measuring electrode wound on the cylindrical roll; and a meandering measuring unit for measuring the meandering of the measuring electrode wound on the cylindrical roll.

Inventors

  • 이유진

Assignees

  • 주식회사 엘지에너지솔루션

Dates

Publication Date
20260512
Application Date
20211008

Claims (10)

  1. A device capable of simultaneously measuring the length and meandering of an electrode for manufacturing a cylindrical battery, A cylindrical roll for winding a measuring electrode slit into a certain size; A length measuring unit for measuring the length of the measuring electrode wound on the cylindrical roll; and It includes a meandering measuring unit for measuring the meandering of the measuring electrode wound on the cylindrical roll; The above meandering measuring unit measures the meandering by irradiating X-rays onto the end of the side holding portion of the measuring electrode that is wound and stacked on the cylindrical roll. A measuring device characterized by the fact that the unexposed portion, which is a metal foil of the measuring electrode, and the retaining portion, which is formed by applying an active material on the current collector, show different images when measured with an X-ray inspection device, thereby enabling determination of whether there is meandering.
  2. A measuring device according to claim 1, characterized in that the measuring electrode is slit to the same length as the length used in manufacturing the cylindrical battery.
  3. A measuring device according to claim 1, wherein the length measuring part measures the length of the holding part from the beginning to the end of the measuring electrode being wound.
  4. A measuring device according to claim 1, wherein the length measuring part measures the length of the unwound portion from the beginning to the end of the measuring electrode being wound.
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  6. A method capable of simultaneously measuring the length and meandering of an electrode using a measuring device according to any one of claims 1 to 4, a) a step of preparing the measuring electrode by slitting the electrode to a predetermined size; b) a step of attaching one side of the measuring electrode to the cylindrical roll; c) a step of winding the measuring electrode by rotating the cylindrical roll; d) a step of measuring the length of the measuring electrode being wound; and e) a step of measuring the meandering of the wound measuring electrode; comprising a measurement method.
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Description

Apparatus and method capable of simultaneously measuring electrode length and meandering The present invention relates to an apparatus and method capable of simultaneously measuring the length and meandering of an electrode for manufacturing a cylindrical battery by providing a length measuring unit and a meandering measuring unit. With the increasing technological development and demand for mobile devices such as smartphones, laptops, and digital cameras, technologies related to rechargeable secondary batteries are becoming more active. Furthermore, secondary batteries are being applied to electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), and energy storage devices (ESS) as alternative energy sources to fossil fuels that cause air pollutants. Currently, widely used types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, that is, unit battery cells, is approximately 2.0V to 5.0V. Therefore, if a higher output voltage is required, multiple battery cells may be connected in series to form a cell module assembly, and cell module assemblies may also be connected in series or parallel according to the required output voltage or charge/discharge capacity to form a battery module. It is common practice to manufacture a battery pack by adding additional components using at least one of these battery modules. These battery cells can be broadly classified into prismatic, cylindrical, and pouch types depending on the shape of the case. A double-walled cylindrical battery cell is manufactured by housing a jelly-roll type electrode assembly in a cylindrical case and injecting an electrolyte into the cylindrical case. Here, a jelly-roll type electrode assembly is generally manufactured by connecting an anode, a separator, and a cathode to a core, and then rotating the core to wind the anode, separator, and cathode together along the circumference of the core. Patent Document 1 discloses various types of jelly-roll type electrode assemblies. For example, as shown in FIG. 1, a jelly-roll type electrode assembly can be manufactured by stacking and winding in the order of a cathode, a first separator, an anode, and a second separator. Recently, as cylindrical batteries have become higher output, the length of electrodes used in jelly-roll type electrode assemblies is also trending upward, and due to this increased length, there is a problem in accurately measuring the electrode length. In addition, ripples may occur due to the increased length of the electrode during slitting, and these ripples cause the problem of the winding electrode becoming skewed. If electrode meandering occurs during the manufacturing process of jelly-roll type electrode assemblies for actual cylindrical batteries, severe cases may result in internal short circuits caused by contact between the positive and negative electrodes, or lithium deposition due to positive/negative reversal, which poses critical safety risks. Furthermore, process issues may arise, such as the jelly-roll not being properly formed or the outer diameter becoming too large to fit into the cylindrical case; therefore, it is crucial to identify the presence of meandering prior to the manufacturing process of the cylindrical battery. However, currently, the process proceeds without a step to measure meandering before winding, leading to problems such as defects or performance degradation of the jelly-roll type electrode assembly due to meandering errors. Therefore, there is a need for a device and method capable of measuring the length and meandering of the electrode in advance before manufacturing a jelly-roll type electrode assembly applied to a cylindrical battery. FIG. 1 is a schematic diagram illustrating a conventional jelly-roll type electrode assembly. FIG. 2 is a schematic perspective view illustrating a measuring device according to one embodiment of the present invention. FIG. 3 is a schematic perspective view illustrating the shape of an electrode wound on a cylindrical roll of a measuring device according to one embodiment of the present invention. FIG. 4 is a cross-sectional view schematically illustrating a cross-section of an electrode wound on a cylindrical roll of a measuring device according to one embodiment of the present invention. In this application, terms such as “comprising,” “having,” or “having” are intended to specify the existence of the features, numbers, steps, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. In addition, the same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughou