CN-122006960-A - Separator, slit die and method for coating electrode plate using slit die

Abstract

A separator, a slit die, and a method of coating an electrode plate using the slit die are disclosed. The spacer is configured to be placed between the upper die and the lower die of the slit die, and is configured to form a gap between the upper die and the lower die. The spacer may include a spacer body portion configured to be coupled to the upper mold and the lower mold, and a plurality of insulating liquid discharging portions provided on one side of the spacer body portion and configured to discharge the insulating liquid. When the electrode plate is coated by the slit mold, the paste may be discharged through an area of the separator other than the separator body part and the insulating liquid discharge part, and the insulating liquid may be discharged through the insulating liquid discharge part such that the insulating liquid is coated adjacent to an end of the discharged paste.

Inventors

• Cui Huizhu
• Lu Kencheng
• ZHOU MINXI
• Jin Hezhu

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260512

Application Date

20251105

Priority Date

20241112

Claims (12)

1. 1. A spacer configured to be placed between an upper die and a lower die of a slit die to form a gap between the upper die and the lower die, the spacer comprising: A spacer body portion configured to be coupled to the upper mold and the lower mold, and A plurality of insulating liquid discharge portions provided on one side of the separator main body portion and configured to discharge insulating liquid, Wherein the separator is configured such that, when the electrode plate is coated by the slit die, a paste is discharged through a region of the separator other than the separator main body portion and the insulating liquid discharge portion, and the insulating liquid is discharged through the insulating liquid discharge portion such that the insulating liquid is coated adjacent to an end of the discharged paste.
2. 2. The spacer according to claim 1, wherein a step is formed in a discharge hole of the insulating liquid discharge portion through which the insulating liquid is discharged.
3. 3. The separator of claim 2, wherein the insulating liquid discharge portion comprises: a discharge body portion connected to the separator body portion, and A discharge head forming an insulating liquid flow path and including the discharge orifice, the discharge head being coupled to the discharge body.
4. 4. The separator of claim 3 wherein the discharge head is removably coupled to the discharge body, and Wherein the amount of the insulating liquid discharged through the insulating liquid discharge portion is regulated by replacement of the discharge head portion having the step formed in the discharge hole at a different height.
5. 5. The separator of claim 1, wherein the insulating liquid discharge portion comprises: A first insulating liquid discharge portion extending from an end of the separator main body portion on the one side thereof and bent toward an inside of the end of the separator main body portion, and A second insulating liquid discharge portion provided at the inner side of the end portion of the separator main body portion at intervals on the one side of the separator main body portion.
6. 6. The spacer of claim 5, wherein a position of the second insulating liquid discharge portion on the spacer body portion is adjustable.
7. 7. The separator of claim 6, wherein a moving slot is formed in the separator body portion, the second insulating liquid discharge portion being movably coupled to the moving slot.
8. 8. The spacer of claim 7, further comprising a fixing portion configured to fix the second insulating liquid discharge portion, which is moved to an arbitrary position along the moving groove, to the moving groove.
9. 9. The spacer of claim 7, wherein graduations are marked on the spacer body portion adjacent the movement slots.
10. 10. A slot die, comprising: An upper die; A lower mold provided below the upper mold, and The separator according to any one of claims 1 to 9.
11. 11. A method of coating an electrode plate using a slot die, the slot die comprising: An upper mold, a lower mold provided below the upper mold, and A spacer interposed between the upper mold and the lower mold and forming a gap between the upper mold and the lower mold, Wherein the spacer includes a spacer body portion coupled to the upper and lower molds and a plurality of insulating liquid discharge portions provided on one side of the spacer body portion and configured to discharge an insulating liquid, The method comprises the following steps: When a paste is discharged through a region of the separator other than the separator main body portion and the plurality of insulating liquid discharge portions, and the insulating liquid is discharged from the insulating liquid discharge portions, the insulating liquid is coated adjacent to an end portion of the paste.
12. 12. The method of claim 11, wherein the insulating liquid discharge portion of the spacer includes a discharge body portion connected to the spacer body portion and a discharge head portion including an insulating liquid flow path and a discharge orifice, and the discharge head portion is detachably coupled to the discharge body portion, and Wherein the method further comprises adjusting the amount of the insulating liquid discharged by replacing the discharge head with another discharge head, a height of a step formed in the discharge hole of the other discharge head being different from a height of a step formed in the discharge hole of the replaced discharge head.

Description

Separator, slit die and method for coating electrode plate using slit die The present application claims priority and benefit from korean patent application No. 10-2024-0160593 filed on the 11 th month 12 of 2024 in korean intellectual property office, the entire disclosure of which is incorporated herein by reference. Technical Field The present disclosure relates to a separator, a slit die, and a method of coating an electrode plate using the slit die. More particularly, the present disclosure relates to a separator including a plurality of insulating liquid discharge portions discharging an insulating liquid, a slit mold, and a method of coating an electrode plate using the slit mold. Background Unlike a primary battery that cannot be recharged, a secondary battery can be discharged and recharged. Low-capacity secondary batteries are used in portable small-sized electronic devices such as smart phones, function phones, notebook computers, digital cameras, and video cameras. A large-capacity secondary battery is widely used as a power source for driving a motor such as in a hybrid vehicle or an electric vehicle and storing electric power. The secondary battery includes an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, and a terminal part connected to the electrode assembly. The lithium secondary battery is manufactured by coating a slurry on a substrate for positive and negative electrodes. Then, the coated substrates are sequentially assembled as positive and negative electrodes with a separator interposed therebetween. When contact between the positive and negative electrodes occurs during the manufacturing process, a short circuit may occur. In severe cases, the short circuit may cause a fire. In the coating process of the method of manufacturing the electrode plate for the secondary battery, the short circuit may be prevented by coating the insulating liquid on the edge of the electrode that may be in contact with the opposite electrode. Conventionally, methods of applying an insulating liquid include various methods such as a method of simultaneously applying an active material slurry and an insulating liquid and a method of applying an insulating liquid from a nozzle onto an electrode plate. In the case of using a method of simultaneously coating an active material slurry and an insulating liquid, problems such as breakage of the electrode plate and an increase in error rate of the electrode plate may occur. A problem may be caused by an excessive coating of the insulating coating liquid on the active material slurry portion, and thus an increase in the electrode plate occurs at the time of continuous production. The information disclosed in this background section is used to enhance an understanding of the present disclosure. It may contain information that does not constitute a relevant or prior art. Disclosure of Invention Embodiments of the present disclosure are directed to providing a spacer including a plurality of insulating liquid discharge portions discharging an insulating liquid, a slit mold, and a method of coating an electrode plate using the slit mold. The technical problems to be solved by the present disclosure are not limited to the above-described problems, and other problems not mentioned herein and aspects and features of the present disclosure to solve these problems will be clearly understood by those skilled in the art from the following description. In an embodiment, a spacer configured to be placed between an upper die and a lower die of a slit die to form a gap between the upper die and the lower die may include a spacer body portion configured to be coupled to the upper die and the lower die, and a plurality of insulating liquid discharge portions provided on one side of the spacer body portion and configured to discharge an insulating liquid. The separator is configured such that when the electrode plate is coated by the slit mold, the paste may be discharged through an area of the separator other than the separator main body portion and the insulating liquid discharge portion, and the insulating liquid may be discharged through the insulating liquid discharge portion such that the insulating liquid is coated adjacent to an end of the discharged paste. In an embodiment, the step may be formed in a discharge hole of the insulating liquid discharge portion through which the insulating liquid is discharged. In an embodiment, the insulating liquid discharge portion may include a discharge main body portion connected to the separator main body portion, and a discharge head portion forming an insulating liquid flow path and including a discharge hole, the discharge head portion being coupled to the discharge main body portion. In an embodiment, the discharge head portion may be detachably coupled to the discharge body portion. The amount of the insulating liquid discharged from the insulating liquid disc