Lithium ion battery flexible packaging material, and lithium ion battery prepared from lithium ion battery flexible packaging material

Abstract

The invention belongs to the field of energy storage device, and especially relates to a lithium ion battery flexible packaging material, and a lithium ion battery prepared from the lithium ion battery flexible packaging material. The lithium ion battery flexible packaging material comprises a substrate layer, a first bonding layer, a metal foil layer, an anti-corrosion treatment layer, a second bonding layer, and a sealing layer successively from outside to inside; the anti-corrosion treatment layer is composed of at least one layer selected from a nickel layer, a nickel alloy layer, a copper layer, and a copper alloy layer; and the metal foil layer is coated with the anti-corrosion treatment layer via plating. The lithium ion battery comprises a naked battery cell, an electrolyte, and a packaging bag; the naked battery cell and the electrolyte are coated by the packaging bag; and the packaging bag is made from the lithium ion battery flexible packaging material. The lithium ion battery is prepared from the lithium ion battery flexible packaging material containing the anti-corrosion treatment layer, so that hydrofluoric acid resistance is improved obviously, lithium alloy is not easily generated, and lithium precipitation is not caused even when short out of a negative electrode with the lithium ion battery flexible packaging material is caused, electrochemical corrosion resistance is improved, lithium ion battery application safety is improved, and service life is prolonged.

Description

technical field [0001] The present application relates to the field of energy storage devices, in particular to a lithium-ion battery flexible packaging material and a lithium-ion battery using the material. Background technique [0002] In related technologies, aluminum-plastic composite films are generally used as flexible packaging materials for lithium-ion batteries. The basic composition of the aluminum-plastic composite film is the inner polypropylene film layer, the middle aluminum foil layer and the outer nylon protective layer. When the lithium-ion battery is packaged in the cell, there may be burrs or active material particles around the cell. During the pumping process, these burrs or particles will pierce the inner layer to the aluminum foil layer; during the cell packaging process, due to mechanical effects Or the inner layer of the aluminum-plastic composite film is damaged due to over-melting during heat sealing, which in turn leads to the direct contact of t...

AI Technical Summary

Problems solved by technology

[0003] Patent CN101992570A discloses that the aluminum-plastic composite film of polyamide film / thermosetting adhesive layer / aluminum foil / thermosetting adhesive layer / unsaturated anhydride-modified polypropylene film has excellent water vapor barrier properties, explosion-proof properties and heat-sealing adhesiveness, but for solving Galvanic corrosion has no apparent effect

The patent CN102324557 improves the electrochemical corrosion resistance through inorganic oxide-polymer coating and transparent lithium-ion battery. However, although the polymer coating can alleviate the corrosion effect to a certain extent, it cannot fundamentally solve the problem. , especially as the energy density of lithium-ion batteries is getting higher and higher, and the packaging bags used are getting thinner and thinner, the corrosion problem is even more serious

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