JP-2026075310-A - Flame-retardant gasket material, secondary battery case and ECU case

Abstract

[Problem] To provide a gasket with excellent flame retardancy as a gasket sheet for papermaking. [Solution] The non-metallic gasket material of the present invention contains organic fibers, an organic binder, and a metal hydroxide other than an alkali metal, wherein the proportion of the metal hydroxide is 100 parts by mass or more and 300 parts by mass or less per 100 parts by mass of the total amount of organic fibers and organic binder. The gasket material preferably has a flame retardancy rating of V-1 or higher according to the UL94 combustion test. The gasket material is preferably used for sealing around electronic components that pose a risk of flame, such as secondary battery cases and ECU cases. [Selection Diagram] None

Inventors

• 佐藤 隼人
• 水口 友貴
• 大塚 友加里

Assignees

• セキネシール工業株式会社

Dates

Publication Date

20260508

Application Date

20241022

Claims (2)

1. It contains organic fibers, an organic binder, and metal hydroxides other than alkali metals. A non-metallic gasket material in which the proportion of the metal hydroxide is 100 parts by mass or more and 300 parts by mass or less per 100 parts by mass of the total of the organic fiber and the organic binder.
2. The non-metallic gasket material according to claim 1, wherein the flame retardancy evaluation by the UL94 combustion test is V-1 or higher.

Description

This invention relates to a non-metallic gasket material. Non-aqueous electrolyte secondary batteries, such as lithium-ion batteries, are widely used as portable power supplies for personal computers and mobile devices, as well as for vehicle power supplies, due to their lightweight nature and high energy density. In particular, lithium-ion batteries, with their lightweight and high energy density, are preferred as high-output power supplies for electric vehicles (EVs), hybrid vehicles (HVs), and plug-in hybrid vehicles (PHVs). In recent years, while battery density and capacity have increased, safety issues such as combustion due to high temperatures and thermal runaway have arisen. Battery components include numerous parts such as the battery itself, the battery case, and the cells. The gasket material used to seal these components plays a vital role in preventing fluid leakage and the intrusion of dust and other contaminants from inside and outside the battery. While sealing performance is crucial for typical automotive gasket components, gaskets used around the battery require not only sealing but also flame retardancy to prevent the spread of fire from the battery. Patent Document 1 proposes a sealing molding material used for forming seals to seal the electrolyte of a secondary battery, characterized in that the sealing base material contains a plate-shaped filler. The sealing base material is an ethylene-α-olefin copolymer rubber, and the filler is barium sulfate. The seal formed using this sealing molding material may be an O-ring, packing, or gasket of a desired shape used to seal the opening of a secondary battery. Japanese Patent Publication No. 2010-092658 Figure 1 is a schematic diagram illustrating the evaluation method for air seal performance.Figure 2 shows the appearance of the gasket (punched) used when evaluating the air sealing performance.Figure 3 is a schematic diagram illustrating the evaluation method for water-sealing properties.Figure 4 shows the appearance of the gasket (punched) used when evaluating the water-sealing properties. First, although the following disclosures, figures, and/or claims are described either individually or in combination with one or more other aspects, the subject matter of the immediate disclosure is not intended to be limited in that way. That is, the immediate disclosures, figures, and claims are intended to encompass the various aspects described herein, either individually or in one or more combinations with each other. For example, even if the immediate disclosure describes and illustrates the first, second, and third embodiments in such a way that the first embodiment is described and illustrated particularly in relation to the second embodiment, or the second embodiment is described and illustrated only in relation to the third embodiment, the immediate disclosures and illustrations are not limited in that way and may include only the first embodiment, only the second embodiment, only the third embodiment, or one or more combinations of the first, second, and/or third embodiments, such as the first and second embodiments, the first and third embodiments, the second and third embodiments, or the first, second, and third embodiments. In this text, the phrase "or" is used to mean a "non-exclusive" arrangement unless explicitly specified. For example, when we say "item x is A or B," it means either (1) item x is either A or B, or (2) item x is both A and B. In other words, the word "or" is not used to define an "exclusive" arrangement. Furthermore, the phrases "containing at least one" or "containing at least one of the following" used in the text, when used in combination with a system or element, mean that the system or element contains one or more of the elements listed after the phrase. For example, if there are three types of elements (element 1, element 2, and element 3), the phrases "containing at least one" or "containing at least one of the following" are interpreted as any of the following structural arrangements: a device containing element 1, a device containing element 2, a device containing element 3, a device containing element 1 and element 2, a device containing element 1 and element 3, a device containing element 2 and element 3, or a device containing element 1, element 2, and element 3. The same interpretation is intended when the phrase "used in at least one of the following" is used in the text. Furthermore, "and/or" used in the text functions as a linguistic conjunction, indicating that one or more of the listed elements or conditions are included or occur. For example, a device containing the first element, the second element, and/or the third element is interpreted as any of the following structural arrangements: a device containing the first element, a device containing the second element, a device containing the third element, a device containing the first and second elements, a device containing the first and third elements,