Why do electrical appliances use metal shells?

One is that metal materials are stronger and more durable than plastic as shell materials;

Second, the resistance of metal materials is small, which can meet the equipotential requirements of grounding body (shell);

Third, metal materials can shield electromagnetic interference signals;

The fourth is to strengthen heat dissipation. The thermal conductivity and heat dissipation of metallic materials are better than that of non-metallic materials (plastics).

Aluminum shell alloy material structure has significant safety performance considerations, which can be expressed by material thickness and bulging coefficient. The reason why lithium batteries with the same capacity are lighter than those with steel shells is that aluminum shells can be made thinner. From the working mechanism of lithium-ion battery, when charging, lithium ion is de embedded, and the positive electrode volume expands; When discharging, lithium ions are embedded from the positive pole and the negative pole expands; Will cause solid expansion, and the bulging coefficient can be reduced by appropriate alloy formula.

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