EP-4741070-A1 - SHIM PLATE AND SLOT DIE COATER INCLUDING SAME

Abstract

A shim plate including a shim body and a coating layer is provided. The shim body is made of a stainless steel material. The coating layer is coated on a surface of the shim body. The shim plate is disposed between a first die block and second die block to create slot die coater with a slot defined within.

Inventors

• JANG, JIWOONG
• AHN, BYOUNG HOON
• PARK, SEUNG SEO
• HWANG, YUJIN
• LEE, JUNGWON
• KIM, JOOHEE

Assignees

• LG ENERGY SOLUTION, LTD.

Dates

Publication Date

20260513

Application Date

20250626

Claims (15)

1. A shim plate comprising: a shim body including stainless steel; and a coating layer coated on a surface of the shim body.
2. The shim plate of claim 1, wherein the shim plate is configured to discharge an active material, and the shim body includes: a first side end portion disposed on a first side of the shim body, a second side end portion disposed on a second side of the shim body, and a rib positioned between and parallel to the first side end portion and the second side end portion, wherein the first side end portion and the second side end portion are in a shape of a plate.
3. The shim plate of claim 2, further comprising an opening positioned between the first side end portion and the rib, between the rib and the second side end portion, or between the ribs.
4. The shim plate of claim 1, wherein the shim body includes an SUS304 material.
5. The shim plate of claim 1, wherein the coating layer is an adhesive.
6. The shim plate of claim 1, wherein the coating layer is elastic.
7. The shim plate of claim 1, wherein the coating layer includes a fluorocarbon resin coating material.
8. The shim plate of claim 1, wherein the coating layer is coated by a spray method or a multiple-overlapping coating method.
9. The shim plate of claim 1, wherein the coating layer includes a plurality of coating layers.
10. The shim plate of claim 1, wherein a thickness of the coating layer is in a range from 3 to 6 µm.
11. The shim plate of claim 2, wherein the rib includes a step in a thickness direction of the rib.
12. The shim plate of claim 2, wherein the rib includes: a central portion positioned at a center of the rib, and a first step portion disposed on a first side end of the central portion and a second step portion disposed on a second side end of the central portion, wherein the first step portion and the second step portion have a thickness smaller than that of the central portion.
13. The shim plate of claim 1, wherein a thickness tolerance of the shim plate falls in a range from 99% to 102%.
14. A slot die coater comprising: a first die block; a second die block configured to face the first die block; and a shim plate of claim 1, the shim plate being interposed between the first die block and the second die block to define a slot.
15. A method for manufacturing a shim plate, comprising: preparing a shim body; cleaning a surface of the shim body to remove contaminants; coating at least one coating layer on the shim body by a spray method or a multiple-overlapping coating method; and curing the coating layer.

Description

[Technical Field] The present disclosure relates to a shim plate and a slot die coater including the same. [Background] Secondary batteries refer to batteries that are chargeable and dischargeable, unlike primary batteries that are not chargeable, and are applied not only to portable devices but also to electric vehicles (EVs), hybrid electric vehicles (HEVs), and the like driven by electric drive sources. Types of secondary batteries currently in widespread use include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and the like. An operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is about 2.5 V to 4.6 V. Therefore, when a higher output voltage is required, a plurality of battery cells are connected in series to configure a battery pack. In addition, a plurality of battery cells may be connected in parallel to configure a battery pack according to the charge/discharge capacity required for a battery pack. Accordingly, the number of battery cells included in the battery pack may be set variously according to the required output voltage or charge/discharge capacity. When configuring a battery pack by connecting a plurality of battery cells in series or in parallel, in general, a battery module including at least one battery cell, preferably a plurality of battery cells, is first configured, and then a battery pack is configured by adding other components while using the at least one battery module. Here, the battery module refers to a component in which a plurality of battery cells are connected in series or in parallel, and the battery pack refers to a component in which a plurality of battery modules are connected in series or in parallel to increase a capacity, an output, and the like. Note that in a process of manufacturing such a secondary battery, during a slot die coating process in which an electrode active material slurry is applied to an electrode current collector, it is necessary to perform a thickness polishing process using a conventional SUS430 material in order to control the tolerance of the shim thickness. However, the shim bending occurs due to heat generation during the shim thickness polishing process, which increases the machining difficulty and leads to a low yield of non-defective products. In addition, the above-described material has the disadvantages of a long manufacturing period and a very high handling cost. [Disclosure] [Technical Problem] An object of the present disclosure is to minimize the thickness tolerance of a shim plate. Another object of the present disclosure is to secure the yield and economic efficiency of a shim plate. Still another object of the present disclosure is to shorten the manufacturing period of a shim plate. However, the technical problems to be solved by the present disclosure are not limited to those described above, and other problems not explicitly mentioned will be apparent to those skilled in the art from the following description of the disclosure. [Technical Solution] To solve the above-described problems, a shim plate according to an exemplary aspect of the present disclosure includes: a shim body including stainless steel; and at least one coating layer coated on a surface of the shim body. In an aspect of the present disclosure, the shim plate is configured to discharge an active material, and the shim body may include a first side end portion in the shape of a plate provided on one side; a second side end portion in the shape of a plate provided on the other side; and at least one rib provided between the first side end portion and the second side end portion and arranged parallel to the first side end portion and the second side end portion. Preferably, an opening portion in which at least one region is cut from an end of the shim body may be provided between the first side end portion and the rib, between the rib and the second side end portion, or between the ribs. In another aspect of the present disclosure, the shim body may include an SUS304 material. Preferably, the coating layer is adhesive. In another aspect of the present disclosure, the coating layer is elastic. In one aspect of the present disclosure, the coating layer may include a fluorocarbon resin coating material. Preferably, the coating layer may be coated by a spray method or a multiple-overlapping coating method. In one aspect of the present disclosure, the coating layer may include a plurality of coating layers. Preferably, a thickness of one layer of the coating layer may be configured to be 3 to 6 µm. In another aspect of the present disclosure, the rib may be configured to have at least one step in a thickness direction of the rib. Preferably, the rib may include a central portion provided at a center, and step portions provided on both side ends of the central portion and configured to have a thickness smaller than that of the central portion. Prefer