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KR-20260065676-A - Nonflammable insulation film and nonflammable insulation pad containing the same

KR20260065676AKR 20260065676 AKR20260065676 AKR 20260065676AKR-20260065676-A

Abstract

The present invention relates to a non-combustible insulating sheet for delaying battery thermal runaway and a non-combustible insulating pad including the same. The purpose is to provide a non-combustible insulating sheet for delaying battery thermal runaway and a non-combustible insulating pad including the same, wherein the thermal runaway phenomenon of some battery cells can be delayed or prevented by a non-combustible insulating pad in which the non-combustible insulating sheet and silicone foam are integrated. The present invention relates to a non-combustible thermal insulation sheet comprising 70–82 wt% kaolin, 4–14 wt% a polymer containing 1,4-benzenedicarbonyl dichloride and 1,4-benzenediamine (CAS NO. 26125-61-1), 4–15 wt% a polymer containing benzene, 1,4-dichloro-, and sodium sulfide (Na2S) (CAS NO. 26125-40-6), 4–13 wt% polyethylene terephthalate, and 1–5 wt% water-soluble alumina, which is integrated onto one or both sides of silicone foam and, when installed between battery cells, [regarding] the [regarding] generated in the battery pack It is designed to delay/prevent thermal runaway.

Inventors

  • 여학규
  • 이승현

Assignees

  • 주식회사 엘투와이

Dates

Publication Date
20260511
Application Date
20241101

Claims (4)

  1. A non-combustible thermal insulation sheet for delaying battery thermal runaway, characterized by comprising 70-82 wt% kaolin, 4-14 wt% 1,4-benzenedicarbonyl dichloride, polymer with 1,4-benzenediamine, 4-15 wt% benzene, 1,4-dichloro-, polymer with sodium sulfide (Na2S), 4-13 wt% polyethylene terephthalate, and 1-5 wt% water-soluble alumina.
  2. In claim 1; A non-combustible insulating sheet for delaying battery thermal runaway, characterized by having physical properties of thickness: 0.11 to 0.17 mm, density: 1.4 to 1.6 gr/cm³, burst strength: 110 to 200 kPa, and thermal conductivity: 0.1 to 0.15 WW/mK.
  3. In a non-combustible thermal insulation pad installed within a battery pack to delay or prevent thermal runaway; The above-mentioned non-combustible insulation pad comprises a silicone foam and a non-combustible insulation sheet of claim 1 or claim 2 integrally installed on one or both sides of the silicone foam, characterized in that it is a non-combustible insulation pad for delaying battery thermal runaway.
  4. In claim 3; The silicone foam comprises, based on 100 parts by weight of polyorganosiloxane, 20 to 150 parts by weight of aluminum hydroxide or magnesium hydroxide, 001 to 10 parts by weight of a platinum-based flame retardant, and 00001 to 01 parts by weight of a platinum catalyst. The above polyorganosiloxane comprises 30-60 wt% of a first polydiorganosiloxane having at least two unsaturated hydrocarbon groups, 30-60 wt% of a second polydiorganosiloxane having one or two hydroxyl groups, 5-38 wt% of a third polydihydrogensiloxane having a hydrogen group at the terminal, and 0.2-20 wt% of a fourth polydihydrogensiloxane having at least two hydrogen groups, and the platinum-based flame retardant is a phosphate-platinum complex, and the platinum-based flame retardant is Pt{P( CH3 ) 3 } 4 , Pt{P( C4H9 ) 3 } 4 , Pt{P( OCH3 ) 3 } 4 , Pt{P( OC6H5 ) 3 } 3 , A non - combustible insulation pad comprising a non - combustible insulation sheet for delaying battery thermal runaway, characterized by being composed of one selected from Pt{P( C6H5 ) 3 } 3 , Pt{P( OC6H5 ) 3 } 4 , Pt{P( C6H5 ) 3 } 4 , Pt{P( C6H5 )( C2H5 ) 2 } 4 , Pt{P( OC6H5)(OC2H5 ) 2}4, and Pt {P ( C6H5 ) 2 ( OC2H5 )} 4 , having a foam structure with a thickness of 10 to 15 mm, a hardness (ShoreOO) of 20 to 60, and a density of 0.20 to 0.45 (g/cm³).

Description

Nonflammable insulation film for delaying battery thermal runaway, and nonflammable insulation pad containing the same The present invention relates to a non-combustible insulating sheet for delaying battery thermal runaway and a non-combustible insulating pad including the same. The invention relates to a non-combustible insulating sheet for delaying battery thermal runaway that is installed between battery cells to provide a buffering function and blocks heat diffusion caused by the temperature rise of the battery cells, thereby preventing thermal runaway phenomena, and a non-combustible insulating pad including the same. Eco-friendly vehicles refer to vehicles such as electric cars and fuel cell cars that emit no exhaust gases, and these vehicles are equipped with a motor for driving and a battery to power it. In this way, the battery pack applied to eco-friendly vehicles has a plurality of battery cells stacked within a case, and a cushioning pad made of a foam member that can expand and contract according to pressure (surface pressure) is placed between the battery cells. In the battery pack constructed as described above, if the temperature continuously rises due to manufacturing defects, improper handling or misuse of the battery, or the occurrence of a short circuit in some battery cells, or if the temperature of the battery cells exceeds the critical temperature due to exposure to high temperatures from external sources, a thermal runaway phenomenon occurs. In addition, since the aforementioned battery cells are stacked in close contact, if a thermal runaway phenomenon occurs in some battery cells, the phenomenon can propagate to adjacent battery cells within a short period of time, leading to a problem where it can result in ignition or explosion of battery modules or battery packs, which are battery units with a larger capacity than the battery cells. In particular, when thermal runaway occurs, the battery cell generates a high temperature range of about 600°C to 800°C, and due to such high temperatures, surrounding flammable materials are ignited, further increasing the risk of ignition. Conventional battery packs for electric vehicles are designed so that thermal runaway phenomena generated in one battery cell cannot be propagated to another battery cell by installing a non-combustible insulation pad made of urethane foam (PU foam) between one battery cell and another adjacent battery cell, thereby delaying or preventing the propagation of thermal runaway phenomena. However, although the above-mentioned urethane foam (PU foam) is equipped with a cushioning function that allows it to expand and contract according to pressure (surface pressure), it has material characteristics of poor heat resistance and flame retardancy. Consequently, when the battery temperature rises, the foam decomposes in a temperature range lower than the high-temperature range where thermal runaway occurs (around 200°C), resulting in a problem where the required thermal runaway delay effect cannot be expected. FIG. 1 is an exemplary diagram showing the configuration of a non-combustible thermal insulation pad for delaying battery thermal runaway according to the present invention. FIG. 2 is an exemplary diagram of the reaction mechanism of a platinum-based flame retardant according to the present invention. FIG. 3 is an exemplary diagram showing a fire resistance test method according to Embodiment 4 of the present invention. Figure 4 is an example diagram showing the configuration of a battery pack. FIG. 1 is an exemplary diagram showing the configuration of a non-combustible thermal insulation pad for delaying battery thermal runaway according to the present invention, FIG. 2 is an exemplary diagram of the reaction mechanism of a platinum-based flame retardant according to the present invention, FIG. 3 is an exemplary diagram showing a fire resistance test method according to Example 4 of the present invention, and FIG. 4 is an exemplary diagram showing the configuration of a battery pack. The non-combustible insulating sheet (11) according to the present invention contains a high content of kaolin, and the non-combustible insulating sheet (11) containing such a high content of kaolin is integrated on one or both sides of a silicone foam (12) to provide a non-combustible insulating pad (10). The non-combustible insulating paper (11) according to the present invention comprises 70-82 wt% kaolin, 4-14 wt% 1,4-benzenedicarbonyl dichloride, polymer with 1,4-benzenediamine, 4-15 wt% benzene, 1,4-dichloro-, polymer with sodium sulfide (Na2S), 4-13 wt% polyethylene terephthalate, and 1-5 wt% water-soluble alumina. The above kaolin forms a coating film that is porous yet possesses excellent fire resistance against degradation, thereby improving non-combustibility and thermal insulation at high temperatures. Furthermore, it possesses excellent bonding strength to silicone foam, thus enhancing the bonding between the non-combustib