Exterior member for secondary battery

Abstract

The present invention relates to an exterior member for a secondary battery, the exterior member having at least a base material layer, a barrier layer, and a sealant layer in this order, the barrier layer being made of a metal foil, the barrier layer having an anti-corrosion treatment layer at least on the sealant layer side, the sealant layer being formed of an acid-modified polyolefin-based resin, and the sealant layer being formed of an acid-modified polyolefin-based resin. The sealing layer is directly formed on the anti-corrosion treatment layer, the thickness of the sealing layer is 5-30 [mu] m, the sealing layer contains a high-melting-point substance, the average particle diameter of particles of the high-melting-point substance is 40-70% of the thickness of the sealing layer, the number of the high-melting-point substance per unit volume of the sealing layer is 100 particles / cm<3> or more and less than 100,000 particles / cm<3>, and the average particle diameter of the particles of the high-melting-point substance is 40-70% of the thickness of the sealing layer. Inorganic particles and / or organic particles are used as the high-melting-point material, the inorganic particles are selected from at least one of aluminum oxide, silicon oxide, magnesium oxide and glass, and the organic particles are selected from at least one of nylon and epoxy resin.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 201610398634.6 with the filing date of June 7, 2016, and the title of the invention is "Exterior Components for Secondary Batteries". technical field [0002] The present invention relates to an exterior member for a secondary battery. Background technique [0003] In recent years, the spread of portable devices such as mobile phones, smartphones, and music player portable devices, hybrid electric vehicles, electric vehicles, etc. is advancing. Secondary batteries typified by nickel-hydrogen batteries and lithium-ion batteries are used as batteries for supplying electricity as their power sources and power sources. For secondary batteries, light weight and compactness are required in portable equipment applications, and in vehicle applications, they are connected in parallel or in series to increase energy and output power, and multilayers are developed. Light weight and compactness are fu...

AI Technical Summary

Problems solved by technology

[0010] However, the method described in Patent Document 1 can prevent a short circuit between the tab lead and the metal foil used as the barrier layer of the exterior member, but the film thickness becomes thicker due to the addition of an intermediate layer.

[0011] Lithium-ion secondary batteries, which have become popular in recent years, have the danger of degrading battery performance, causing heat generation, and igniting due to failure to maintain electrical insulation. Therefore, it is necessary to prevent short-circuiting of secondary batteries.

However, on the other hand, the actual situation is that effective means for preventing a short circuit between the tab lead and the secondary battery exterior member while reducing the thickness of the exterior member in this way have not yet been sufficiently obtained.

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