KR-20260067536-A - SECONDARY BATTERY ASSEMBLY FOR ELECTRIC VEHICLE WITH THERMAL RUNAWAY RESPONSE FUNCTION

Abstract

An electric vehicle secondary battery assembly equipped with a thermal runaway response function is disclosed. An electric vehicle secondary battery assembly equipped with a thermal runaway response function according to one side is provided with an aluminum vent having an overlapping Y-shaped notch formed on a part of the SFTC surface of the top of the prismatic battery.

Inventors

• 전덕병

Assignees

• 주식회사 케이앤이

Dates

Publication Date

20260513

Application Date

20241106

Claims (5)

1. As a secondary battery assembly for electric vehicles equipped with a thermal runaway response function, A secondary battery assembly for an electric vehicle equipped with a thermal runaway response function, comprising an aluminum vent having an overlapping Y-shaped notch formed on a portion of the SFTC surface at the top of the prismatic battery.
2. In paragraph 1, The above vent is a secondary battery assembly for an electric vehicle equipped with a thermal runaway response function, wherein the notch thickness (Cpk) is 1.67 or more, the thickness deviation of the notch is within 5㎛, and the fracture pressure is 12.5±1.5 (kgf/㎠).
3. In paragraph 1, A secondary battery assembly for an electric vehicle equipped with a thermal runaway response function, wherein the thickness deviation is monitored in real time using a non-destructive notch thickness measuring instrument for six points of the notch formed in the vent.
4. In paragraph 1, The above vent is a secondary battery assembly for an electric vehicle equipped with a thermal runaway response function, manufactured by a mirror-finishing process through punch and die processing surface lapping to reduce the generation of aluminum dust.
5. In paragraph 4, The above vent is a secondary battery assembly for an electric vehicle equipped with a thermal runaway response function, manufactured by equipment that further includes an oil supply system that supplies a predetermined amount of oil at regular intervals to each mold part to discharge stamped aluminum dust out of the mold.

Description

Secondary battery assembly for electric vehicle with thermal runaway response function The present invention relates to a secondary battery assembly for an electric vehicle equipped with a thermal runaway response function, and more specifically, to a secondary battery assembly for an electric vehicle equipped with a thermal runaway response function by adding a means made of aluminum material to the top of a prismatic battery for a secondary battery to prevent the internal pressure of the battery from rising excessively above a certain level. 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 notch formed in the vent breaks first at a certain pressure to release internal gas, thereby preventing the explosion and fire of the battery