Battery module and secondary battery

Abstract

The invention provides a battery cell able to avoid fire spreading or heating of the battery effectively, undergo fire extinguishment of a battery on fire, and may has compact structure so as to have high volume energy density. The battery cell of the invention is formed as follows, e.g., a spacer (52) interposed between a plurality of batteries in a battery module has an inner cavity. A filling agent having fire-extinguishing capability is filled in the inner cavity. An opening can be formed at a portion (low-melting point portion 14) of the spacer (52) by heat so that the filling agent can flow out of the spacer. The invention also provides a secondary battery packaged with flexible outer package; wherein a thermal conductive material layer formed of gelatinous matter is formed on a surface of the outer package.

Description

technical field The present invention relates to a battery pack composed of a plurality of batteries, in particular to a battery pack which is lightweight, safe, excellent in high-load characteristics, and high in reliability. Background technique For example, a power supply for power installed in a robot or an electric vehicle is required to be small, lightweight, and low-cost because it is enclosed in a limited space. As a power source satisfying such demands, lithium ion batteries having high energy density have attracted attention in recent years. In order to generate high power, the lithium ion battery is used as a battery pack in which, for example, about 5 or 6 to more than 10 batteries are connected in series or in parallel. Here, when the above-mentioned lithium ion battery is charged and discharged, the temperature of the battery may rise. At this time, if the battery pack is constructed in a state where the sides of the batteries are in close contact, the heat d...

AI Technical Summary

Problems solved by technology

In addition, if the space in the module or battery case is filled with dry sand or paraffin as disclosed in the above-mentioned Patent Documents 2 and 3, the volume of the module or battery case will increase beyond the capacity of filling the dry sand or paraffin. The amount of space, so there will be a problem that the volumetric energy density of the battery pack is reduced

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