KR-20260062665-A - IMMERSION COOLING BATTERY PACK

KR20260062665AKR 20260062665 AKR20260062665 AKR 20260062665AKR-20260062665-A

Abstract

The present invention discloses an immersion-cooled battery pack capable of preventing fire by maintaining a battery module housed in a lower case at a state below its ignition point, by connecting a lower case and an upper cover with a leak-prevention connection portion to prevent the leakage of insulating fluid between the lower case and the upper cover. The disclosed immersion-cooled battery pack is characterized by comprising: a lower case having an open upper portion and an inlet pipe portion that guides the inflow of insulating fluid on its periphery; a battery module accommodated in the lower case to be immersed in the insulating fluid introduced through the inlet pipe portion; an upper cover covering the open portion of the lower case and having an outlet pipe portion that guides the discharge of insulating fluid on its periphery; and a leakage prevention connection portion connecting the lower case and the upper cover to prevent leakage of insulating fluid between the lower case and the upper cover.

Inventors

서승구

Assignees

(주) 영진

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (9)

A lower case having an open upper side and an inlet pipe section on its perimeter that guides the inflow of insulating fluid; A battery module housed in the lower case so as to be immersed in the insulating fluid introduced through the inlet pipe; An upper cover covering an open portion of the lower case and having a discharge pipe portion on its periphery that guides the discharge of insulating fluid; and A leakage prevention connection connecting the lower case and the upper cover to prevent leakage of insulating fluid between the lower case and the upper cover; A liquid-immersion cooled battery pack characterized by including
In paragraph 1, The above battery module is, A plurality of first battery cells arranged in a row along the length direction of the lower case and spaced apart along the width direction of the lower case; A second battery cell arranged in a row along the length direction of the lower case and spaced apart along the width direction of the lower case so as to be adjacent to the first battery cell while staggered; A first integration fixing part for fixing the upper side of the first battery cell and the second battery cell so as to be integrated; and A second integrated fixing part that fixes the lower side of the first battery cell and the second battery cell so as to be integrated; A liquid-immersion cooled battery pack characterized by including
In paragraph 2, The above-mentioned first integrated fixing part is, A plurality of first fitting holders that are collectively fitted to an adjacent pair of the first battery cells and an adjacent pair of the second battery cells and are mutually slideably connected; and A pair of connecting members that integrally connect the first fitting holders arranged on the outer edge along the width direction of the lower case among the first fitting holders; A liquid-immersion cooled battery pack characterized by including
In paragraph 3, On the circumferential surface of the first fitting holder, a plurality of first rail grooves and a plurality of first slide rails are formed spaced apart, and A liquid-immersion cooling type battery pack characterized in that the above connecting member has a first connecting slide rail that is slidably fitted into the first rail groove on a portion facing the circumferential surface of the first fitting holder, and a plurality of first connecting rail grooves that are slidably inserted into the first slide rail.
In paragraph 2, The above-mentioned second integrated fixing part is, A pair of outer fitting holders fitted into the first battery cell and the second battery cell arranged on the outer side along the longitudinal direction of the lower case among the first battery cell and the second battery cell; and A plurality of second fitting holders that are collectively fitted to an adjacent pair of first battery cells and an adjacent pair of second battery cells between the outer fitting holders, and are mutually slideably connected; A liquid-immersion cooled battery pack characterized by including
In paragraph 5, On the circumferential surface of the second fitting holder, a plurality of second rail grooves and a plurality of second slide rails are formed spaced apart, and A liquid-immersion cooling type battery pack characterized by the outer fitting holder having a second connecting slide rail that slides into the second rail groove portion in a sliding manner on a portion facing the circumferential surface of the second fitting holder, and a plurality of second connecting rail groove portions that slide into the second slide rail portion, spaced apart from each other.
In paragraph 1, The above-mentioned leakage prevention connection part is, A support flange portion protruding along the upper circumference direction of the lower case; A seating flange portion formed to protrude along the lower circumference of the upper cover so as to be seated on the support plan portion; A sealing pad interposed between the support flange portion and the seating flange portion; and A contact fixing part that fixes the support flange part and the seating flange part so that both sides of the sealing pad are in close contact with the support flange part and the seating flange part; A liquid-immersion cooled battery pack characterized by including
In Paragraph 7, The above-mentioned close-fitting part is, A plurality of through holes are formed spaced apart and penetrating the support flange portion; A communication hole formed through the sealing pad to communicate with the above-mentioned through hole; A fastening groove formed by being recessed into the seating flange portion to communicate with the above communication hole portion; and A fastening bolt inserted into the through hole portion to be fastened to the fastening groove portion; A liquid-immersion cooled battery pack characterized by including
In paragraph 8, A liquid-immersion cooling type battery pack characterized by having, on each side of the thickness direction of the sealing pad, a first contact protrusion formed protruding with a diameter larger than the diameter of the communication hole centered on the communication hole, and a plurality of second contact protrusions formed protruding spaced apart along the circumference direction of the sealing pad and connected to the first contact protrusion.

Description

Immersion Cooling Battery Pack The present invention relates to an immersion-cooled battery pack, and more specifically, to an immersion-cooled battery pack that can prevent fire by maintaining a battery module housed in a lower case at a state below the ignition point by connecting a lower case and an upper cover such that an leakage prevention connection prevents the leakage of insulating fluid between the lower case and the upper cover. Generally, electric vehicles are vehicles that operate using electrical energy output from a battery. Since these electric vehicles use a battery formed as a single pack of multiple rechargeable and dischargeable cells as a power source, they have the advantage of producing no exhaust gas and very little noise. As electric vehicles utilize electric energy, battery performance directly affects the vehicle's performance; therefore, a battery management system is required to measure the voltage of each battery cell, the voltage and current of the entire battery, efficiently manage the charging and discharging of each cell, and determine whether each battery cell is degraded to ensure maximum performance. Recently, the use of lithium-ion batteries in such electric vehicles has been increasing. As a type of rechargeable lithium-ion battery, it features a multilayer structure comprising a positive electrode activated by various mixed oxides or olivine, a negative electrode activated by specific carbons, and a separator immersed in an organic electrolyte. In other words, during charging, lithium in the positive electrode is ionized and moves layer by layer toward the negative electrode, and during discharging, the ions move to the positive electrode and return to their original compounds. As such, since the battery is the most significant factor affecting the performance of electric vehicles, battery capacity must be increased to achieve high speeds and long driving ranges, and consequently, stable charging and discharging functions are required. However, heat is generated by the chemical reactions of electrons in electric vehicle batteries, and this generated heat causes a degradation in battery performance and lifespan. Furthermore, if a fire occurs due to battery overheating, there is a problem that the entire vehicle could be lost due to thermal runaway within the battery pack's internal cells. Therefore, there is a need to improve this. A related background technology is Korean Patent Publication No. 10-2024-0002040 (published Jan. 4, 2024, Title: Battery Thermal Management System for Electric Vehicles). FIG. 1 is a perspective view illustrating an immersion-cooled battery pack according to one embodiment of the present invention. FIG. 2 is an exploded perspective view illustrating an immersion-cooled battery pack according to one embodiment of the present invention. FIG. 3 is an exploded perspective view showing a battery module in an immersion-cooled battery pack according to one embodiment of the present invention. FIG. 4 is a cross-sectional view illustrating a leakage prevention connection in a liquid immersion cooling type battery pack according to one embodiment of the present invention. FIG. 5 is a cross-sectional view illustrating a state in which a battery module is immersed in an insulating fluid in a liquid-immersion cooling type battery pack according to one embodiment of the present invention. Hereinafter, an embodiment of an immersion-cooled battery pack according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, the terms described below are defined in consideration of their functions in the present invention, and these may vary depending on the intent or practice of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification. FIG. 1 is a perspective view illustrating an immersion-cooled battery pack according to an embodiment of the present invention, FIG. 2 is an exploded perspective view illustrating an immersion-cooled battery pack according to an embodiment of the present invention, FIG. 3 is an exploded perspective view illustrating a battery module in an immersion-cooled battery pack according to an embodiment of the present invention, FIG. 4 is a cross-sectional view illustrating a leakage prevention connection in an immersion-cooled battery pack according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view illustrating a state in which a battery module is immersed in an insulating fluid in an immersion-cooled battery pack according to an embodiment of the present invention. As illustrated in FIGS. 1 to 5, a liquid-immersion cooling type battery pack according to one embodiment of the present invention includes a lower case (100), a battery module (200), an upper c