Deep drawing process for battery box body

Abstract

The invention belongs to the technical field of battery boxes and relates to a deep drawing process for a battery box body. The method comprises a primary drawing procedure and a secondary drawing procedure. According to the primary drawing procedure, equipment gas ejector rods and feeding fillets are adopted to control a feeding speed; the feeding of the positions of the straight surfaces of a box-shaped part is fast, and the feeding of the positions of the fillets of the box-shaped part is slow; when a drawing die is designed, fillets are small at the fillet fast-feeding positions of a female die, and feeding resistance is increased, and therefore, the fillets at the fast-feeding positions are increased, so that the feeding resistance can be decreased; drawing height is 95% of that of abox body; after drawing is completed, a material is controlled to be thinned by 10 %, and side surfaces will not be wrinkled and cracked. According to the secondary drawing procedure, nitrogen springsare used for controlling a feeding speed; after a material dragging table presses a plane so as to constrain the plane, secondary drawing is carried out; drawing height is 100% of that of the box body; after stretching is completed, the material is thinned by 15%, the side surfaces and a bottom surface will not be wrinkled or cracked. The battery box produced by adopting the method has attractiveappearance, will not be wrinkled and cracked, and is free of loading-induced battery pack water leakage, potential safety hazards and repair problems and can assist in decreasing production cost.

Description

technical field [0001] The invention relates to the technical field of battery boxes, in particular to a deep drawing process for battery boxes. Background technique [0002] The prior art adopts the first sequence of stretching and the second sequence of shaping. [0003] The feeding speed at the edge of the first sequence groove is too fast, and the feeding fillet is not considered to control the feeding speed, resulting in too fast feeding, more product materials, serious wrinkling at the fillet, and the stretching height is 100 of the product. %. [0004] In the second order shaping, the plane is not controlled, resulting in uneven plane. [0005] Cracks and wrinkles appear at the bottom of the stretched R angle in the existing box process, resulting in uneven bottom surface of the product. If the bottom surface is uneven, it will affect the appearance of the product, and in terms of performance, the airtightness of the battery box will be poor. The package leaks, cau...

AI Technical Summary

Problems solved by technology

[0003] The feeding speed at the edge of the first sequence groove is too fast, and the feeding fillet is not considered to control the feeding speed, resulting in too fast feeding, more product materials, serious wrinkling at the fillet, and the stretching height is 100 of the product. %

[0004] The second order shaping, the plane is not controlled, resulting in uneven plane

[0005] Cracks and wrinkles appear at the bottom of the stretched R angle in the existing box process, resulting in uneven bottom surface of the product. If the bottom surface is uneven, it will affect the appearance of the product, and in terms of performance, the airtightness of the battery box will be poor. Bag leaks, causing safety hazards

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