Packaging materials for batteries and batteries

Abstract

The present invention provides a battery packaging material capable of effectively suppressing battery unsealing even when the battery is exposed to high temperature. The battery packaging material includes a laminate having at least a base material layer, a barrier layer, an adhesive layer, and a heat-sealable resin layer in this order, and heat-seals the above-mentioned heat-sealable resin layers in a state facing each other. The packaging material is water-encapsulated, and when the temperature is raised to the unsealing test temperature T°C above 100°C under vacuum, and the above-mentioned battery packaging material is not opened within 10 minutes after reaching the above-mentioned unsealing test temperature T°C. The melting peak temperature of the adhesive layer is higher than the above-mentioned unsealing test temperature T°C by 10°C or more.

Description

technical field [0001] The present invention relates to a battery packaging material and a battery. Background technique [0002] Various types of batteries have been developed, and packaging materials for encapsulating battery elements such as electrodes and electrolytes are indispensable components in all batteries. Conventionally, metal packaging materials are often used as battery packaging, but in recent years, with the improvement of performance of electric vehicles, hybrid electric vehicles, personal computers, cameras, mobile phones, etc., batteries require various shape, and requires thinning and lightening. However, the metal packaging materials for batteries that are widely used in the prior art have the disadvantages that it is difficult to cope with the diversification of shapes, and there is a limit to the reduction in weight. [0003] Therefore, in recent years, as a battery packaging material that can be easily processed into various shapes and can achieve ...

AI Technical Summary

Problems solved by technology

[0004] On the other hand, depending on the type of electrolyte, the battery may generate flammable gas and cause a pressure rise

For example, when the battery is exposed to high temperatures, the organic solvent used in the electrolyte may decompose, producing flammable gas and causing a pressure rise

In addition, the temperature inside the battery may continue to rise due to overvoltage charging or excessive current discharge, etc., causing the battery reaction to run out of control.

[0005] In a battery using a film-shaped battery packaging material, such an increase in the pressure or temperature inside the battery may cause the battery packaging material to crack, and cause a fire due to the emission of flammable gas.

In addition, when the pressure or temperature inside the battery continues to rise and the packaging material for the battery expands excessively, once the battery reaction goes out of control, the battery may explode.

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