Copper-aluminum composite connecting piece and battery cover plate

Abstract

The application belongs to the technical field of batteries, and discloses a copper-aluminum composite connecting piece and a battery cover plate, which comprise an aluminum zone and a copper zone, the copper zone is connected with the aluminum zone, a copper-aluminum boundary line is formed between the aluminum zone and the copper zone, the aluminum zone is welded with a pole, the copper zone is welded with a negative electrode lug, and a connecting welding mark area for connecting the copper zone and the negative electrode lug is formed, the distance between the boundary line of the connecting welding mark area facing the copper-aluminum boundary line and the copper-aluminum boundary line in the first direction is X, and 4mm≤X≤30mm is satisfied. By reducing the use amount of copper material, the cost is reduced, and the weight is reduced. By limiting the size of the connecting welding mark area formed after the copper zone is welded with the negative electrode lug, the interval between the boundary line of the connecting welding mark area facing the copper-aluminum boundary line and the aluminum boundary line is avoided to be too short, the interface at the copper-aluminum boundary line after welding is avoided to be damaged, a crack near the copper-aluminum boundary line is avoided to be caused, and the mechanical property is avoided to be reduced, and the risk of fracture is avoided to be increased.

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