Lower frame of electric vehicle and chassis

Abstract

The invention discloses a lower frame of an electric vehicle and a chassis using the frame, and relates to the technical field of new energy vehicles. The lower frame comprises a front-end frame, a battery box fixing frame, a rear-end frame and a battery box lower shell, wherein the front-end frame, the battery box fixing frame, the rear-end frame and the battery box lower shell are all thin-wallaluminum alloy pieces; the front-end frame is positioned in front of the battery box fixing frame; the front-end frame is in threaded connection with the front end and the front side edge of the battery box frame through four bolt sets; the rear-end frame is located behind the battery box fixing frame, the rear-end frame is in threaded connection with the rear end and the rear side edge of the battery box frame through four bolt sets, the battery box lower shell is located in the battery box fixing frame, and the battery box lower shell is connected with the battery box frame through a circleof screws at the bottom. The lower frame has the characteristics of no need of welding, simple process, high precision, light weight, high structural strength and modular assembly, and can adapt to small-batch or customized production of electric vehicles.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a lower frame and chassis of an electric vehicle. Background technique [0002] Under the dual pressure of environment and energy, the development of new energy vehicles in my country is becoming more and more urgent, and electrification and intelligence are important development directions of the new energy vehicle industry. At present, there are mainly two ways to develop electric vehicles. One is the transformation of traditional fuel vehicles, modifying the bottom of the frame and installing a battery pack. One is to positively design the frame according to the needs of electric vehicles and battery characteristics. This type of frame usually adopts one or more welding combinations of aluminum sheet metal parts, aluminum profiles, and small cast aluminum parts. [0003] It is less difficult to manufacture and produce a battery car directly from an existing fuel...

AI Technical Summary

Problems solved by technology

[0003] It is less difficult to manufacture and produce a battery car directly from an existing fuel car model. However, because traditional cars usually use a load-bearing body made of steel sheet metal parts, the electric car developed often has the following disadvantages: insufficient battery life due to heavy weight , the three-electric configuration is limited by the existing frame, which leads to unreasonable layout, difficulty in realizing intelligence, network-connected layout requirements, and small ground clearance after installing a battery pack at the bottom, etc.

[0005] 1) Due to the existence of a large number of solder joints and welds, the safety and reliability of the structure are greatly reduced: the single parts made of sheet metal parts and aluminum profiles are simple in shape, and a large number of components are indispensable to form a frame that can meet the load-bearing and functional requirements. combination of parts and welded connections

For the part of the frame with large load and multi-functional requirements (such as the connection between the shock tower and the longitudinal beam, the connection between the transverse beam and the longitudinal beam and other key positions), there are many connecting parts and links, and the welding path is complicated

Compared with steel welding, aluminum welding is more difficult, and the welding process is not very mature. Welding deformation and weld strength are problems that need to be solved.

[0006] 2) The quality of the frame structure is high: restricted by the unique manufacturability requirements of sheet metal parts and profile parts, the material layout is redundant in some parts or even in a large area, and a large number of connecting link materials are stacked, which hinders the lightweight design of the frame

[0007] 3) The production process is complex and the initial investment is large: the frame has parts made of various special-shaped extrusion profiles, sheet metal parts, castings and other processes, and there are many welding and riveting links, and the production process is complicated. In order to ensure that the frame To obtain sufficient manufacturing precision, the production of the frame is inseparable from a large number of welding tooling and special welding equipment. The production line requires a one-time large-scale investment. However, electric vehicles have not yet been widely accepted by consumers, and sales are limited. The need to improve performance, it is difficult for car companies to achieve profitability under the condition of small batches

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