KR-20260067590-A - MANUFACTURING METHOD OF ELECTROMAGNETIC WAVE SHIELDING COATING AGENT FOR BATTERY CELL COVERS OF ELECTRIC VEHICLES

Abstract

The present invention relates to a method for manufacturing an electromagnetic shielding coating solution for a drone used as a remote equipment for nuclear power plant decommissioning, comprising: a CNT milling process (S10) for micronizing carbon nanotube (CNT) powder using a dynomill; an intermediate manufacturing process (S20) for manufacturing a coating intermediate by mixing and stirring water, a surfactant, an acidity regulator, and an additive; a primary filtering process (S30) for filtering the coating intermediate obtained from the intermediate manufacturing process (S20) to a particle size of 500 to 1000 nm using a primary filter; a centrifugation process (S40) for obtaining a fraction by separating the coating intermediate that has passed through the primary filtering process (S30) by centrifugation; and a CNT pigment for mixing a pigment mixed with the micronized carbon nanotube powder obtained from the CNT milling process (S10) with the fraction obtained from the centrifugation process (S40). The method is characterized by manufacturing a coating agent capable of forming a coating layer that provides electromagnetic shielding performance by spraying it onto the surface of a battery cell cover of an electric vehicle, by including a mixing process (S50) and a secondary filtering process (S60) in which a mixture of carbon nanotube coating agents obtained from a CNT pigment mixing process (S50) is filtered to a particle size of 800 to 1000 nm using a secondary filter.

Inventors

• 윤광호

Assignees

• 주식회사 디티아이

Dates

Publication Date

20260513

Application Date

20241106

Claims (2)

1. A method for manufacturing an electromagnetic shielding coating agent for an electric vehicle battery cell cover, wherein the method comprises: forming a coating layer that imparts electromagnetic shielding capability by spraying it onto the surface of the electric vehicle battery cell cover; wherein the method for manufacturing the electromagnetic shielding coating agent comprises: A CNT milling process (S10) for finely refining carbon nanotube (CNT) powder using a dyno mill, and An intermediate manufacturing process (S20) for manufacturing a coating intermediate by mixing and stirring water, a surfactant, an acidity regulator, and an additive, and A primary filtering process (S30) for filtering the coating intermediate obtained in the above intermediate manufacturing process (S20) to a particle size of 500 to 1000 nm using a primary filter, and A centrifugation process (S40) for obtaining fractions by separating the coating intermediate that has undergone the above primary filtering process (S30) into layers by centrifugation, and A CNT pigment mixing process (S50) in which a pigment is mixed with the finely milled carbon nanotube powder obtained in the CNT milling process (S10) to the fraction obtained in the above centrifugation process (S40), and A secondary filtering process (S60) for filtering the carbon nanotube coating agent mixture obtained in the above CNT pigment mixing process (S50) to a particle size of 800 to 1000 nm using a secondary filter; A method for manufacturing an electromagnetic shielding coating agent for a battery cell cover of an electric vehicle, characterized by including at least one step.
2. In Article 1, The above intermediate manufacturing process (S20) is; A process step of manufacturing by combining 20 to 30 weight% of water, 4 to 10 weight% of a surfactant, 2 to 5 weight% of an acidity regulator, and as additives, 1 to 4 weight% of an antifoaming agent, 2 to 7 weight% of an emulsifier, 3 to 7 weight% of a humectant, 4 to 11 weight% of a thickening agent, 3 to 12 weight% of a binder, and 2 to 5 weight% of a preservative. The above CNT pigment mixing process (S50) is; A process step of manufacturing by mixing a pigment at 5 to 15 weight percent relative to the total weight of the coating agent, wherein the carbon nanotube powder in the pigment is blended at 5 to 10 weight percent relative to the total weight of the pigment; A method for manufacturing an electromagnetic shielding coating agent for a battery cell cover of an electric vehicle, characterized by the following:

Description

Manufacturing Method of Electromagnetic Wave Shielding Coating Agent for Battery Cell Covers of Electric Vehicles The present invention relates to a method for manufacturing an electromagnetic shielding coating agent for a battery cell cover of an electric vehicle, and more specifically, to a method for manufacturing a coating agent that provides shielding ability against electromagnetic waves generated from a battery cell and minimizes harmful substances by forming a coating layer by spraying a coating agent containing carbon nanotube components onto a cover of a battery cell mounted in an electric vehicle. Generally, an electric vehicle is an eco-friendly vehicle powered by electricity that generates driving energy by supplying electrical energy stored in a high-voltage battery to an electric motor. An electric vehicle includes a motor that drives the wheels, a reduction gear that generates power by appropriately reducing the motor's rotational speed, a battery that stores electrical energy, and a power converter for charging the battery and driving the motor; the battery in an electric vehicle is a rechargeable battery capable of repeated charging and discharging. A typical secondary battery consists of a battery pack comprising a battery cell, which is the smallest unit consisting of a positive electrode, a negative electrode, an electrolyte, and a separator inside a container; a battery module, which is an assembly of a certain number of battery cells placed in a frame; and a Battery Management System (BMS) that connects and controls multiple battery modules. Recently, electric vehicles have a significant energy load, equipped with 800V high-voltage batteries and 350kW ultra-fast charging capabilities, and large-capacity models with battery capacities of 70 to 100kWh or more are emerging, so advanced energy control technology is required to take into account various variables that occur during driving. Among the various malfunction issues of electric vehicles, the possibility that problems such as overcurrent generation, heat generation, and component damage due to oxide film formation caused by electromagnetic interference (EMI) may lead to serious functional and safety issues is being widely examined. In order to address these issues, related technologies are being developed to incorporate electromagnetic shielding capabilities into the internal devices of electric vehicles. As a representative example of the disclosed technology, Korean Registered Patent No. 10-1294176 further includes a case that accommodates and protects a battery and a power relay assembly inside, and a battery management system is installed on one side of the outside of the case so that the battery management system and the battery are located in different spaces, and a BMS mounting groove is formed on one side of the outside of the case where the battery management system is installed to securely mount the battery management system, and the BMS mounting groove is formed so as not to protrude from the surface of the case when the battery management system is mounted, thereby configuring a battery system for electromagnetic shielding. As another example, Korean Published Patent No. 10-2021-0109180 comprises a gasket interposed in the joint portion of case members made of metal materials constituting the battery pack, wherein an electrically conductive member formed of one or more or two or more alloys selected from the group consisting of iron, aluminum, copper, gold, silver, nickel, titanium, and stainless steel is inserted into the gasket to form a battery pack case with improved electromagnetic shielding performance. As another example, Korean Registered Patent No. 10-2245691 discloses a technology for an electromagnetic shielding device for an electric vehicle, wherein first and second closed shields are formed by an insulating film, an aluminum sheet, a copper sheet, and a ferrite sheet, and the first and second closed shields are electrically connected to a vehicle frame grounding connection line that moves generated electromagnetic waves to the vehicle frame, and the vehicle frame grounding connection line is electrically connected to a ground grounding connection line so that electromagnetic waves collected through the first and second closed shields are transmitted to the ground through the vehicle frame grounding connection line and the ground grounding connection line. FIG. 1 is a process flow diagram of a method for manufacturing an electromagnetic shielding coating agent for a battery cell cover of an electric vehicle according to the present invention. Hereinafter, the structure and operation according to a preferred embodiment of the method for manufacturing an electromagnetic shielding coating agent for a battery cell cover of an electric vehicle according to the present invention will be described in detail with reference to the attached drawings. In the following description, specific details regarding parts tha