Heat transfer suppression sheet and battery pack

Abstract

Provided are: a heat transfer suppressing sheet which has an excellent heat transfer suppressing effect, while having excellent inorganic particle retention properties and excellent shape retention properties at high temperatures; and a battery pack which is obtained by sandwiching the heat transfer suppressing sheet between battery cells. A heat transfer suppressing sheet (10) includes inorganic particles (20), first inorganic fibers (30), and second inorganic fibers (31). The average fiber diameter of the first inorganic fibers (30) is larger than the average fiber diameter of the second inorganic fibers (31). In addition, the first inorganic fibers (30) are linear or needle-shaped, and the second inorganic fibers (31) are dendritic or curled.

Description

technical field [0001] The present invention relates to a heat transfer suppressing sheet and a battery pack in which the heat transfer suppressing sheet is interposed between battery cells. Background technique [0002] In recent years, from the viewpoint of environmental protection, the development of electric vehicles driven by electric motors, hybrid vehicles, and the like has been actively carried out. Such an electric vehicle, a hybrid vehicle, or the like is equipped with a battery pack in which two or more battery cells are connected in series or in parallel to serve as a power source for a driving motor. [0003] In addition, lithium-ion secondary batteries capable of achieving higher capacity and higher output than lead storage batteries, nickel-metal hydride batteries, and the like are mainly used for the battery cells. In addition, in the case of thermal runaway in which a battery cell suddenly rises in temperature due to an internal short circuit or overcharge ...

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