Electromagnetic pulse welding method of multilayer battery aluminum plate lugs and copper pole lugs

Abstract

The invention discloses an electromagnetic pulse welding method of multilayer battery aluminum plate lugs and copper pole lugs. The aluminum plate lugs and the copper pole lugs are fixed on a welding device; the welding device comprises a rack; a cushion plate is arranged on the rack; an electromagnetic coil is arranged on the cushion plate; welding areas of the multilayer aluminum plate lugs are placed on the electromagnetic coil; the copper pole lugs are placed on the upper portion of the aluminum plate lug at the uppermost layer; interval pieces are arranged between the welding areas of the aluminum plate lugs as well as the welding areas of the aluminum plate lugs and the copper pole lugs; the aluminum plate lugs and the copper pole lugs are fixed through a pressing plate; the electromagnetic coil is connected with a capacitance switch of a capacitance power supply device; the capacitance switch is controlled by a pulse generator to be switched on and switched off; and the pulse generator is started to charge a capacitor of the capacitance power supply device, when the charging voltage reaches the set value, the capacitance switch is turned on, and the capacitor quickly discharges, so that welding of the battery aluminum plate lugs and the copper pole lugs is achieved. The welding efficiency is improved, the welding quality is improved, energy consumption is reduced, auxiliary materials are not consumed, and energy saving and environmental friendliness are achieved.

Description

technical field [0001] The invention relates to an electromagnetic pulse welding method, in particular to an electromagnetic pulse welding method for aluminum lugs and copper lugs of a multilayer battery. Background technique [0002] With the lightweight of power batteries, "aluminum instead of copper" has become a trend. This requires connecting the copper material and the aluminum material into one body through a welding process. However, copper and aluminum are easily oxidized metals, and the melting points of aluminum and copper differ by about 400 ° C, and the weldability is poor. For this copper and aluminum It is very difficult to achieve a good welding effect in dissimilar metal welding. There are following deficiencies in adopting existing welding technology: [0003] 1. Friction welding, electron beam welding, ultrasonic welding and other welding methods are used to weld copper and aluminum. Due to the uneven temperature field will cause problems such as residua...

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Problems solved by technology

[0004] 2. Laser welding can only weld thinner materials, which requires gas protection, and pore cracks are prone to appear during the welding process

[0005] 3. Only one layer can be welded at a time, not multi-layer welding, and the efficiency is not high

During the welding process, welding auxiliary materials and gases need to be consumed, as well as high energy consumption, etc., and the welding cost is relatively high

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