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Why can't copper wire and aluminum wire be connected together

Update:24-03-2021
Summary:

The organic chemical and physical properties of copper […]

The organic chemical and physical properties of copper and aluminum are very different and cannot be directly connected. However, copper and aluminum connections are unavoidable. When it is necessary to connect, generally choose copper-aluminum connection clamp, copper-aluminum connection connector, copper wire or aluminum wire enamel tin directly before connection.

Briefly introduce the advantages and disadvantages of copper wire and aluminum wire:

Same area

Copper wire has a heavier load than aluminum wire.

Copper wire is more flexible than aluminum wire.

Copper wire has lower resistance than aluminum wire.

Copper wire is more reliable than aluminum wire.

If some friends, first use aluminum wire, then buy copper wire

Can copper wire and aluminum be directly connected?

Answer: No

Why can't copper wire and aluminum wire be connected together?

The organic chemical and physical properties of copper and aluminum are very different and cannot be directly connected.

However, copper and aluminum connections are unavoidable.

When it is necessary to connect, generally choose copper-aluminum connection clamp, copper-aluminum connection connector, copper wire or aluminum wire enamel tin directly before connection.

Because the thermoelectric properties of copper and aluminum are different.

If they are directly connected, once they encounter water, carbon dioxide and the lithium battery electrolyte produced by other residues will produce a chemical battery.

It is because aluminum is easy to lose electronic devices and become negative, and copper cannot lose electronic devices and become positive. Therefore, an induced electromotive force of 1.69V is generated between positive and negative, and there is a small amount of current according to corrosion. Aluminum wire, that is, blunt thermoelectric erosion.

That will cause poor contact between copper and aluminum and increase the loop resistance.

When there is a basis for the amount of current, the temperature of the connector will increase, and the temperature will increase and accelerate the erosion of the connector, which increases the loop resistance, resulting in polarization, until it is damaged, or even a fire accident.

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