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KR-20260064497-A - ELECTRODE PRESSING PROCESS SYSTEM

KR20260064497AKR 20260064497 AKR20260064497 AKR 20260064497AKR-20260064497-A

Abstract

According to one embodiment of the present invention, As an electrode rolling condition inspection system using optical measurement, A pair of rolling rollers positioned above and below the electrode transfer position, A drive unit for driving the above pair of rolling rollers, A first light source located on one side in the driving direction of the pair of rolling rollers and irradiating light toward the pair of rolling rollers, A first sensor located on the other side in the driving direction of the above pair of rolling rollers and detecting light received from the first light source, and It includes a control unit that analyzes surface information of the pair of rolling rollers and the gap between the pair of rolling rollers from information obtained from the first sensor, and An electrode rolling condition inspection system is provided in which the first light source and the first sensor are each movable in the width direction of the pair of rolling rollers.

Inventors

  • 이성호
  • 이정형
  • 최현

Assignees

  • 주식회사 엘지에너지솔루션

Dates

Publication Date
20260507
Application Date
20250821
Priority Date
20241030

Claims (17)

  1. As an electrode rolling condition inspection system using optical measurement, A pair of rolling rollers positioned above and below the electrode transfer position, A drive unit for driving the above pair of rolling rollers, A first light source located on one side in the driving direction of the pair of rolling rollers and irradiating light toward the pair of rolling rollers, A first sensor located on the other side in the driving direction of the above pair of rolling rollers and detecting light received from the first light source, and It includes a control unit that analyzes surface information of the pair of rolling rollers and the gap between the pair of rolling rollers from information obtained from the first sensor, and The first light source and the first sensor are each an electrode rolling condition inspection system capable of moving in the width direction of the pair of rolling rollers.
  2. In paragraph 1, An electrode rolling condition inspection system in which, when obtaining surface information of the pair of rolling rollers from the first light source and the first sensor, the pair of rolling rollers is driven in a state where the electrode is not supplied.
  3. In paragraph 2, An electrode rolling condition inspection system in which the above pair of rolling rollers are driven continuously, and the first light source and the first sensor move from one edge portion in the width direction of the pair of rolling rollers to the other edge portion, and obtain surface information of the pair of rolling rollers.
  4. In paragraph 2 or 3, An electrode rolling condition inspection system in which the driving speed of the above pair of rolling rollers is 50 to 150 m/min.
  5. In paragraph 1, An electrode rolling condition inspection system in which the moving speed of the first light source and the first sensor is 10 to 120 m/min.
  6. In paragraph 2 or 3, An electrode rolling condition inspection system in which, when obtaining surface information of the pair of rolling rollers, the gap between the pair of rolling rollers is 50㎛ to 300㎛.
  7. In paragraph 1, The above control unit is an electrode rolling condition inspection system that determines a rolling roller as defective if, in the surface information of the pair of rolling rollers obtained from the first sensor, there exists a part where the difference between the maximum and minimum gaps between the pair of rolling rollers (110) exceeds 10 μm.
  8. In paragraph 1, The first light source and the first sensor are an electrode rolling condition inspection system that obtains information about the gap between the pair of rolling rollers by irradiating and detecting the light at one edge portion in the width direction of the pair of rolling rollers.
  9. In paragraph 8, An electrode rolling condition inspection system for obtaining information about the gap between the pair of rolling rollers, further comprising: a second light source located on one side in the driving direction of the pair of rolling rollers at the other edge portion of the pair of rolling rollers and irradiating light toward the pair of rolling rollers; and a second sensor located on the other side in the driving direction of the pair of rolling rollers and detecting light received from the second light source.
  10. In Article 8 or 9, An electrode rolling condition inspection system in which the process of obtaining information about the gap between the above-mentioned pair of rolling rollers is performed in real time before and after the supply of electrodes.
  11. In Article 8 or 9, An electrode rolling condition inspection system in which one edge portion and the other edge portion of the above pair of rolling rollers are parts through which the sheet-type electrode does not pass.
  12. In paragraph 8, An electrode rolling condition inspection system in which, if the information regarding the gap between the pair of rolling rollers obtained above differs from the initially set gap, the control unit corrects the gap between the pair of rolling rollers in real time.
  13. In Article 1 or Article 9, An electrode rolling condition inspection system in which the first light source and the second light source are each a laser, a tungsten lamp, or a metal halide lamp.
  14. In Article 1 or Article 9, An electrode rolling condition inspection system comprising a first light source and a second light source, each including a collimator lens that maintains horizontal alignment during light irradiation.
  15. In Article 1 or Article 9, An electrode rolling condition inspection system in which the first sensor and the second sensor are each a CMOS sensor or a CCD sensor.
  16. In Article 1 or Article 9, The electrode rolling condition inspection system, wherein the first sensor and the second sensor are line scan sensors having a width of 20 mm to 50 mm.
  17. In Article 1 or Article 9, An electrode rolling condition inspection system in which the first light source, the second light source, the first sensor, and the second sensor are each positioned at a distance of 100 mm to 1000 mm from the center where the pair of rolling rolls are closest.

Description

Electrode Pressing Condition Inspection System The present invention relates to an electrode rolling condition inspection system, and more specifically, to a system for inspecting electrode rolling conditions using optical measurements before and after electrode rolling. In modern society, as the use of portable devices such as mobile phones, laptops, camcorders, and digital cameras, as well as energy storage systems (ESS), has become commonplace, the development of technologies in related fields is becoming active. Furthermore, rechargeable secondary batteries are being utilized as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) as a solution to address air pollution caused by conventional gasoline vehicles using fossil fuels; consequently, the need for the development of secondary batteries is increasing. Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are receiving the most attention due to their advantages of free charging and discharging, low self-discharge rate, and high energy density. The above-mentioned lithium secondary battery primarily uses lithium-based oxide and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing, namely a battery case, that seals and houses the electrode assembly together with an electrolyte. The manufacturing process of such lithium secondary batteries is broadly divided into three stages: electrode process, assembly process, and formation process. The electrode process is further divided into active material mixing process, electrode coating process, rolling process, slitting process, and winding process. Among these, the rolling process is a process of compressing an electrode substrate to a desired thickness by passing it between a pair of high-temperature heated rolling rollers in order to reduce the thickness of the electrode substrate after the coating process to increase capacity density and increase adhesion between the electrode current collector and the electrode active material. Since the above rolling process is performed by the above pair of rolling rollers, it is inevitably affected by rolling conditions such as the condition of the above pair of rolling rollers, the gap between them, and the roller driving speed. Accordingly, research on methods to adjust the gap between the aforementioned pair of rolling rollers was actively conducted. Specifically, when replacing the rolling rollers, the position of the reference gap was recorded using a gap gauge of the reference thickness, and the gap was adjusted by changing the position of the roller based on the position of the reference gap during the rolling process. If the product specifications manufactured in this way did not match, the position of the roller was modified. However, the above method had a problem in that it could only determine the relative position of the initial rolling roller during cold rolling, and thus could not reflect the gap reduction caused by hot rolling or roller expansion due to friction, and in this case, the rolling conditions had to be adjusted by referring to other indicators. Accordingly, various studies are being conducted on methods to adjust the gap between the aforementioned pair of rolling rollers in real time. Nevertheless, in reality, the specifications or quality of the electrode obtained after the above rolling process vary due to various causes as well as thickness variations caused by the gap between the pair of rollers, so there is a need to develop technology that can improve the quality of the manufactured electrode while maintaining it consistently. FIG. 1 is a perspective view of a rolling condition inspection system according to one embodiment of the present invention. FIG. 2 is a schematic flowchart of a rolling condition inspection system according to one embodiment of the present invention. Figure 3 is a graph of surface information of a pair of rolling rollers identified as normal. Figure 4 is a graph of surface information of a pair of rolling rollers identified as defective. FIG. 5 is a schematic diagram of the longitudinal side of a rolling condition inspection system according to another embodiment of the present invention. FIG. 6 is a schematic diagram in the width direction of a rolling condition inspection system according to another embodiment of the present invention. Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in vari