Lithium ion battery flexible packaging plastic film with embedded heating function and preparation method thereof

Abstract

The invention discloses a lithium ion battery flexible packaging plastic film with an embedded heating function and a preparation method thereof. The flexible packaging plastic film includes an outerpolymer material layer, a heating film layer, a metal material layer and an inner polymer material layer, wherein the heating film layer is provided with a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal vertically penetrate through the outer polymer material layer from the heating film layer to extend to an outer surface and bulge upward to form a spherical body structure. The method comprises steps that plasma corona treatment is performed on a single side of the outer polymer material layer and the innerpolymer material layer and both sides of the heating film layer; both sides of the metal material layer are subjected to chromation; the processing surfaces of the outer polymer material layer and theinner polymer material layer and a signal surface of the metal material layer are coated with binder, and lamination and drying are carried out in the above-mentioned sub-sequence order. The flexiblepackaging plastic film is advantaged in that the heating function is integrated to an internal portion of a battery packaging plastic film, and the whole battery can be heated.

Description

technical field [0001] The invention relates to a lithium-ion battery flexible packaging plastic film with built-in heating function and a preparation method thereof, belonging to the technical field of chemical power source materials. Background technique [0002] Flexible packaging plastic film is the packaging material for soft-packed polymer lithium-ion batteries. Its barrier ability, puncture resistance, electrolyte stability, high temperature resistance and insulation affect the performance of lithium-ion batteries. None of the currently visible plastic films has a heating function, which affects the application of lithium-ion batteries in low-temperature environments. When the lithium-ion battery is at low temperature, especially when it is below 0°C, the discharge capacity will be significantly reduced, and it cannot be charged. If it is charged below 0°C forcibly, lithium-ion lithium will be deposited inside the lithium-ion battery, resulting in the end of the life ...

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