Composite liquid die forging device and method for bottom shell workblank of electric vehicle battery

Abstract

The invention provides a composite liquid die forging device and a method for a bottom shell workblank of an electric vehicle battery, belongs to the technical field of the automobile battery bottom shell forging technology. The device comprises a rack, the top of the rack is provided with a top beam, the top beam is connected with a main cylinder, the lower end of the main cylinder is connected with a movable cross-beam, the main cylinder is equipped with a clamping cylinder and the clamping cylinder is fixed on the top beam, and the piston rod of the clamping cylinder passes through the movable cross-beam to connect a template; the bottom of the movable beam is connected with a main head, and the lower part of the main head is provided with a die, the outer wall of the main head and theinner side wall of the template are connected in seal sliding connection mode; the movable cross-beam is equipped with a supplementary cylinder and the lower end of the supplementary cylinder is provided with an auxiliary pressure head; the die is located on a base, the base is located on a working platform; the bottom of the working platform is equipped with an incubator, the incubator is communicated to the die cavity of the die through a lift pipe. The battery shell is formed as a whole, without bubbles and impurities, and solidifies under the action of pressure, and the battery shell has the advantages of small and smooth microstructure high production efficiency and high material utilization rate.

Description

technical field [0001] The invention relates to the technical field of forging electric vehicle battery bottom shells, in particular to a compound liquid die forging device and method for blanks of electric vehicle battery bottom shells. Background technique [0002] The battery bottom case of an electric vehicle is a key part of a new energy vehicle. It is a boat-shaped shell in which a battery weighing 200-300kg is installed. There are many bosses on the bottom surface and many screw holes on the side wall. The outline size is about 1700mm in length, about 1200mm in width, about 120mm in height, and the horizontal projection area can reach 2m 2 , which is a large shell part, the precision molding of such a large shell part blank is very difficult. [0003] Because the outline size of the electric vehicle battery bottom case is too large, if it is formed by solid-state forging technology, the required equipment tonnage is more than 100MN, and the equipment investment is hu...

AI Technical Summary

Problems solved by technology

The aluminum alloy plate welding method is used to manufacture the blank of the electric vehicle battery bottom case. Due to the poor performance of the aluminum alloy welding joint, the welding quality is unstable, and there is a risk of weld cracking during use; the investment casting (also called precision casting) method is used to manufacture electric vehicles. Due to the large size and weight of the battery bottom case, the wax mold is easy to deform, and often has defects such as pores and inclusions, poor quality stability, and low material utilization; The aluminum alloy inside is hydraulically injected into the mold cavity, cooled and solidified to form, because of the low pressure, the workpiece contour size is too large, the feeding effect is limited, the incidence of shrinkage defects is high, and the scrap rate is as high as 40% or more

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