Separator, battery, battery pack, electronic apparatus, electric vehicle, power storage device, and power system

Abstract

The present invention comprises a layer which is disposed between a positive electrode and a negative electrode, contains particles and a resin material, and has a porous structure that has a heat capacity per unit area of 0.0001 J / Kcm2 or more, and a heat capacity per unit volume of 3.0 J / Kcm3 or less.

Description

technical field [0001] The present invention relates to diaphragms. The present invention also relates to a battery having a separator between electrodes, a battery pack using the battery, an electronic device, an electric vehicle, an electric power storage device, and an electric power system. Background technique [0002] In recent years, accompanying the popularization of portable information-related electronic devices such as mobile phones, video cameras, and laptop computers, performance improvement, size reduction, and weight reduction of these devices have been promoted. For power sources of these devices, disposable primary batteries or secondary batteries that can be reused are used; however, from the viewpoint of being able to effectively achieve a comprehensive balance among performance enhancement, size reduction, weight reduction, economic efficiency, etc., There is an increasing demand for non-aqueous electrolyte batteries, especially for lithium-ion secondary...

AI Technical Summary

Problems solved by technology

Also, regarding applications in electric tools, electric vehicles, etc., many times, although only for a short time, heat dissipation cannot keep up with heat generation caused by large current discharge, and there are cases where the temperature increase of the battery cannot be avoided

In particular, at the time of external short-circuit or internal short-circuit of the battery, there is a risk that the heat emitted from the negative electrode side is large, and the heat ruptures the separator so that the short circuit may further expand, or that the positive electrode is heated to a thermal decomposition temperature, and may violently emit heat or gas from the battery

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