Battery case Material: aluminum alloy; features: the product is square and thin (the thickness tolerance should be less than 0.3) with deep hole and is processed by backward extrusion -Application: applied in the parts of electric automobile and battery pack and mainly applied as battery case of electric automobile -Client Problem: the product requires complicated process and high accuracy -QH Solution: QH realizes once forming of deep hole and makes the thickness of four directions meet the required accuracy with backward extrusion process. -Benefits: low material consumption and high efficiency