KR-20260067537-A - MOLD FOR MANUFACTURING ALUMINUM VENT OF SECONDARY BATTERY ASSEMBLY FOR ELECTRIC VEHICLE AND MANUFACTURING METHOD USING THE SAME

Abstract

A mold for manufacturing a thermal runaway-resistant vent provided on a portion of the SFTC surface at the top of a prismatic battery of an electric vehicle secondary battery assembly is disclosed. A mold for manufacturing a vent for thermal runaway response provided on a portion of the SFTC surface at the top of a prismatic battery of a secondary battery assembly for an electric vehicle according to one side is such that the vent is made of aluminum and has an overlapping Y-shaped notch formed therein. A method for manufacturing a vent using a mold for manufacturing an aluminum vent for an electric vehicle secondary battery assembly according to another aspect manufactures the vent through a mirror-finishing process using punch and die processing surface lapping to reduce the generation of aluminum dust.

Inventors

• 전덕병

Assignees

• 주식회사 케이앤이

Dates

Publication Date

20260513

Application Date

20241106

Claims (4)

1. A mold for manufacturing a thermal runaway-resistant vent provided on a portion of the SFTC surface at the top of a prismatic battery of an electric vehicle secondary battery assembly, A mold for manufacturing an aluminum vent for an electric vehicle secondary battery assembly equipped with a thermal runaway response function, wherein the above vent is made of aluminum and has an overlapping Y-shaped notch formed thereon.
2. In paragraph 1, The above vent is a mold for manufacturing an aluminum vent for an electric vehicle secondary battery assembly equipped with a thermal runaway response function, wherein the vent has a notch thickness (Cpk) of 1.67 or more, a thickness deviation of the notch within 5㎛, and a breaking pressure of 12.5±1.5 (kgf/㎠).
3. A method for manufacturing a vent using an aluminum vent manufacturing mold for a secondary battery assembly for an electric vehicle, wherein A method for manufacturing a vent using a mold for manufacturing an aluminum vent for an electric vehicle secondary battery assembly, wherein the vent is manufactured through a mirror-finishing process via punch and die processing surface lapping to reduce the generation of aluminum dust.
4. In paragraph 3, A method for manufacturing a vent using an aluminum vent manufacturing mold for an electric vehicle secondary battery assembly, further comprising the step of supplying a predetermined amount of oil at regular intervals to each mold part so that the oil supply system discharges the stamped aluminum dust out of the mold.

Description

Mold for manufacturing an aluminum vent of a secondary battery assembly for an electric vehicle and manufacturing method using the same The present invention relates to a mold for manufacturing an aluminum vent for an electric vehicle secondary battery assembly and a manufacturing method using the same. More specifically, the invention relates to a mold for manufacturing an aluminum vent for an electric vehicle secondary battery assembly equipped with a thermal runaway response function to prevent the internal pressure of the battery from rising excessively above a certain level at the top of a prismatic battery for secondary batteries, and a manufacturing method using the same. Thermal runaway in electric vehicle batteries is a condition that occurs when battery cells release excessive heat. If thermal runaway is not properly controlled, serious safety issues can arise. In particular, thermal runaway in electric vehicles occurs due to an excessive temperature rise inside the battery cell and is generally caused by electrical or physical stress, such as external shock, overcharging, over-discharging, or internal short circuits. When thermal runaway occurs, chemical reactions within the battery proceed rapidly, releasing more heat. This heat then spreads sequentially to adjacent cells, potentially inducing explosive heat release throughout the entire battery module. Moreover, if thermal runaway occurs in batteries used in electric vehicles, it can pose a fatal risk to occupants and the surrounding environment. If thermal runaway spreads, the battery pack itself may overheat, potentially causing a vehicle fire, which could damage the vehicle's structure or lead to an accident while driving. To prevent and address such thermal runaway problems, various countermeasures are being researched, such as equipping electric vehicle battery assemblies with various safety devices like temperature sensing sensors, thermal insulation materials, and cooling systems, or addressing thermal runaway issues during the battery assembly design phase. FIG. 1 is a drawing showing an example of a secondary battery assembly for an electric vehicle equipped with a thermal runaway response function. FIG. 2 is a drawing for explaining the key requirements of a vent applied to a secondary battery assembly for an electric vehicle of FIG. 1. FIG. 3 is a drawing for explaining the structural and numerical requirements that the notch of FIG. 2 must have. Figure 4 is a drawing showing an example of a mold for manufacturing a vent applied to a secondary battery assembly for an electric vehicle equipped with a thermal runaway response function. Hereinafter, an embodiment of a U-shaped mouthpiece type toothbrush will be described in detail with reference to the attached drawings. In describing the present invention, if it is determined that adding specific descriptions of technologies or configurations already known in the field may obscure the essence of the invention, such details may be partially omitted from the detailed description. Furthermore, the terms used in this specification are used to appropriately describe the embodiments of the present invention, and these may vary depending on relevant persons or conventions in the field. Accordingly, the definitions of these terms should be based on the content throughout this specification. The technical terms used herein are for the reference of specific embodiments only and are not intended to limit the invention. The singular forms used herein include plural forms unless phrases clearly indicate otherwise. The meaning of “comprising” as used in the specification specifies a particular characteristic, area, integer, step, action, element, and/or component, and does not exclude the presence or addition of other particular characteristic, area, integer, step, action, element, component, and/or group. FIG. 1 is a drawing showing an example of a secondary battery assembly for an electric vehicle equipped with a thermal runaway response function. As shown in Fig. 1, a secondary battery assembly for an electric vehicle equipped with a thermal runaway response function has a notch of the shape shown in the drawing attached to a part of the surface of the SFTC (Safety Function Thermal Control). SFTC (Safety Function Thermal Control) is a safety function designed to control heat-related safety issues such as thermal runaway. It monitors temperature changes in the battery and may include a device that rapidly dissipates or controls heat when a specific temperature threshold is exceeded, thereby enhancing the thermal safety of the battery and preventing thermal runaway. In particular, in the embodiment of Fig. 1, a vent with a notch formed on a part of the SFTC surface at the top of the prismatic battery is incorporated. The vent is a safety device based on the principle that when an abnormal situation occurs due to external impact, overcharging, etc., and the pressure inside the battery rises, the not