A method for sealing the casing of an electrochemical energy storage device with high water and oxygen molecule barrier properties
A barrier performance, electrochemical technology, applied in the field of electrochemical energy storage device preparation, can solve the problem of reducing the barrier capacity of water and oxygen molecules in the shell of electrochemical energy storage devices, reducing the cycle life of electrochemical energy storage devices, and polymer molecular chains. Creep increases and other issues, to achieve the effect of reducing the barrier performance of water and oxygen molecules, improving the barrier capacity of water and oxygen molecules, and good film formation
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Embodiment 1
[0036] Example 1 polymer / alumina composite film coating lithium-ion button cell shell sealing
[0037] process such as figure 1 As shown, the specific preparation steps are as follows:
[0038] 1. Acrylic resin film covers the sealing of the button-type lithium-ion battery shell
[0039] Seal the shell of the button-type lithium-ion battery, use 200W plasma at normal pressure and room temperature, and clean the surface for 30 seconds under the conditions of 4bar, 18 liters / min compressed air, and a working distance of 3mm to remove residual wax, oil stains, grease, Surface contaminants such as organic solvents, hydrocarbon molecules or silicone resins;
[0040] The button lithium-ion battery after cleaning the sealing surface of the shell is coated with epoxy acrylate resin film by cathodic electrophoresis; the concentration of epoxy acrylate resin is 3.0wt%, the electrodeposition voltage is 80V, and the electrodeposition time is 30s; after electrophoretic coating Epoxy acr...
Embodiment 2
[0049] Example 2 Polymer / silicon oxide composite film wrapping winding type cylindrical supercapacitor shell sealing
[0050] process such as figure 1 As shown, the specific preparation steps are as follows:
[0051] 1. Ethylene-vinyl acetate copolymer coated winding cylindrical supercapacitor shell sealing
[0052] Seal the packaged coiled cylindrical supercapacitor shell, and clean the surface for 20s at a working distance of 4mm with 150W normal pressure room temperature plasma, compressed air at 4bar and a flow rate of 18 liters / min;
[0053] The wound-type cylindrical supercapacitor after the surface treatment is electrostatically sprayed, and the N,N-dimethylacetamide solution of ethylene-vinyl alcohol copolymer with a concentration of 3.0wt% is sprayed on its surface, and the electrostatic spraying time is 30s. Voltage 18kV, flow rate 5.0mL / min, electrostatic spraying distance 10cm; obtain a wound-type cylindrical supercapacitor with a thickness of 30nm ethylene-vinyl...
Embodiment 3
[0062] Example 3 Polymer / Oxide Composite Barrier Film Coated Flexible Packaging Lithium-ion Battery Shell Sealing
[0063] process such as figure 1 As shown, the specific preparation steps are as follows:
[0064] 1. Polyvinyl alcohol film-coated flexible packaging lithium-ion battery case seal
[0065] Seal the packaged soft-packed lithium-ion battery case, and use 100W atmospheric pressure room temperature plasma with a power of 100W to compress the air at 4bar and a flow rate of 18 liters per minute, and clean the surface for 10s at a working distance of 5mm;
[0066] Seal the shell of the soft-packaged lithium-ion battery after the plasma surface treatment, and dip it into an aqueous solution of 5.0 wt% polyvinyl alcohol (the degree of polymerization is 3000-4000) for 30 seconds; then vacuum-dry it at 60°C for 12 hours to obtain a thickness 10nm polyvinyl alcohol film-covered soft-packaged lithium-ion battery; remove the polyvinyl alcohol film 1mm away from the sealing e...
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