KR-20260064287-A - HIGH VOLTAGE SYSTEM IN ECO-FRIENDLY VEHICLE AND METHOD FOR PREVENTING INSULATION RESISTANCE DEGRADATION THEREIN

Abstract

The present invention relates to a high-voltage system of an eco-friendly vehicle and a method for preventing a decrease in the insulation resistance thereof, and may include an energy device that supplies high-voltage electrical energy and at least one high-voltage terminal electrically connected to the energy device and coated with a non-conductive insulating material.

Inventors

• 강형구
• 정민경
• 구본혁
• 김예찬
• 이호빈
• 박준영
• 김재상
• 헤르피아나

Assignees

• 국립한국교통대학교산학협력단

Dates

Publication Date

20260507

Application Date

20241031

Claims (10)

1. An energy device that supplies high-voltage electrical energy; and A high-voltage system of an eco-friendly vehicle characterized by comprising at least one high-voltage terminal electrically connected to the energy device and coated with a non-conductive insulating material.
2. In claim 1, The above non-conductive insulating material is, High-voltage system of an eco-friendly vehicle characterized by being an insulating material of carbon components.
3. An energy device that supplies high-voltage electrical energy; and A high-voltage system for an eco-friendly vehicle characterized by including a cover coated with a non-conductive insulating material that protects the energy device.
4. In claim 3, The above non-conductive insulating material is, A high-voltage system for an eco-friendly vehicle characterized by being a resin-based material having insulating properties.
5. An energy device that supplies high-voltage electrical energy; A cover protecting the above energy device; A heater installed on the above cover to generate heat; A temperature sensor installed inside the cover to measure the internal temperature of the cover; and A high-voltage system for an eco-friendly vehicle, characterized by including a controller that determines whether condensation is likely to occur in the energy device based on the internal temperature of the cover measured by the temperature sensor, and controls the operation of the heater based on the result of determining whether condensation is likely to occur.
6. In claim 5, The above controller is, A high-voltage system for an eco-friendly vehicle characterized by controlling the heater to maintain a constant internal temperature of the cover.
7. Step of measuring the internal temperature of the cover of a high-voltage system; A step of determining whether condensation is likely to occur based on the internal temperature of the cover; and A method for preventing a decrease in insulation resistance of a high-voltage system of an eco-friendly vehicle, characterized by including a step of controlling the operation of a heater based on the result of determining whether condensation may occur.
8. In claim 7, The step of determining whether the above-mentioned condensation may occur is, A step of determining that condensation may occur when the internal temperature of the cover deviates from a predetermined temperature range; and A method for preventing a decrease in insulation resistance of a high-voltage system of an eco-friendly vehicle, characterized by including a step of determining that condensation cannot occur when the internal temperature of the cover is within a predetermined temperature range.
9. In claim 7, The step of controlling the operation of the above heater is, A step of operating the heater when it is determined that condensation may occur; and A method for preventing a decrease in insulation resistance of a high-voltage system of an eco-friendly vehicle, characterized by including a step of stopping the heater when it is determined that condensation cannot occur.
10. An energy device that supplies high-voltage electrical energy; A cover protecting the above energy device; and A high-voltage system for an eco-friendly vehicle, characterized by including an air nozzle installed inside the cover and utilizing airflow to discharge moisture inside the cover to the outside.

Description

High Voltage System in Eco-Friendly Vehicle and Method for Preventing Insulation Resistance Degradation Therein The present invention relates to a high-voltage system of an eco-friendly vehicle and a method for preventing the reduction of its insulation resistance. The problem of insulation resistance degradation in high-voltage systems applied to eco-friendly vehicles (e.g., electric vehicles, hydrogen fuel cell vehicles) is primarily caused by electric field concentration between high-voltage terminals and the ground side, as well as an increase in conductive current due to ionized impurities in the coolant. However, there is a lack of systematic measures to effectively prevent and manage this insulation resistance degradation issue. In particular, insulation resistance degradation occurring in high-voltage systems, such as fuel cell stacks and high-voltage battery systems, has a high potential to lead to vehicle performance degradation and safety issues; yet existing technologies have limitations in preventing or resolving these problems in advance. FIG. 1 is a block diagram schematically illustrating the configuration of a hydrogen electric vehicle related to the present invention. FIG. 2 is a diagram illustrating the electric field concentration according to the electrode shape related to the present invention. Figure 3 is a diagram showing the electric field concentration according to the presence or absence of an insulating material related to the present invention. FIG. 4 is a drawing illustrating a high-voltage system of an eco-friendly vehicle according to one embodiment of the present invention. FIG. 5 is a drawing illustrating a high-voltage system of an eco-friendly vehicle according to another embodiment of the present invention. FIG. 6 is a flowchart illustrating a method for preventing a decrease in insulation resistance of a high-voltage system of an eco-friendly vehicle according to another embodiment of the present invention. FIG. 7 is a drawing illustrating a high-voltage system of an eco-friendly vehicle according to another embodiment of the present invention. Unless specifically stated otherwise, terms such as "comprising," "composing," and "having" as used in this specification mean that the relevant component may be inherent, and thus do not exclude other components but rather allow for the inclusion of additional components. Furthermore, terms such as “…part,” “…unit,” and “module” as used in this specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware, software, or a combination of hardware and software. Additionally, articles such as “one,” “one,” and “the” may be used in the context describing the invention to include both singular and plural forms, unless otherwise indicated in this specification or clearly contradicted by the context. Embodiments of the present invention will be described in detail below with reference to the attached drawings. The present invention is intended to prevent the problem of insulation resistance degradation that may occur in the high-voltage systems of eco-friendly vehicles (e.g., electric vehicles, hydrogen fuel cell vehicles, etc.). By mitigating the problem of insulation resistance degradation that may occur in high-voltage systems, electric field concentration between the high-voltage terminals and the chassis is alleviated, and by preventing insulation resistance degradation in the fuel cell stack and high-voltage battery system, the stability and reliability of the vehicle can be improved. FIG. 1 is a block diagram schematically illustrating the configuration of a hydrogen electric vehicle related to the present invention. As illustrated in FIG. 1, the hydrogen electric vehicle (1) may include a hydrogen storage system (10), a fuel cell system (20), a high-voltage battery system (30), and a drive motor (40). The hydrogen storage system (10) can perform the role of supplying hydrogen to the fuel cell stack within the fuel cell system (20). The hydrogen storage system (10) may include a fuel tank that stores hydrogen at high pressure (e.g., 700 bar). The outer shell of the fuel tank may be made of a carbon fiber reinforced composite that can withstand high pressure. The fuel cell system (20) may include a fuel cell stack that generates electrical energy using hydrogen supplied from a hydrogen storage system (10). The fuel cell stack can generate electrical energy (electricity) by reacting hydrogen with oxygen. The fuel cell stack may include two catalytic electrodes, namely an anode and a cathode. When hydrogen and oxygen are supplied to the anode and cathode, respectively, the anode can separate the hydrogen into protons, namely hydrogen ions and electrons. The hydrogen ions move through an electrolyte layer to the cathode, and at the cathode, the hydrogen ions can combine with oxygen to produce water. That is, electrical energy can be produced due to the potential difference be