Steel battery pack shell of new energy automobile

Abstract

A steel battery pack shell of a new energy automobile comprises a body which is a frame body, and at least one cross beam is arranged in the frame body in the length direction; the frame body is made of a hollow closed profile with a special-shaped section, and the hollow closed profile with the special-shaped section is composed of an upper cavity and a lower cavity which are formed by rolling or stamping and welding a plate blank; the upper cavity positioned at the upper part of the profile is of a triangular or quadrilateral structure, and the top surface of the upper cavity is a matching surface connected with a steel battery pack shell cover plate; the lower cavity positioned at the lower part of the profile is an L-shaped cavity; and the cover plate and the bottom plate are respectively arranged on the upper end surface and the lower end surface of the body frame body and are connected with the body frame body through processes such as screw joint, glue joint or welding. The weight and the cost of the steel battery pack shell applying the ultrahigh-strength steel are lower than those of an existing aluminum or steel battery pack shell under the same design requirement.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to a steel battery pack shell of a new energy vehicle and a manufacturing method thereof, which are used as carriers of BMS, battery modules, high-voltage charge-discharge circuits, cooling systems, etc. in the battery pack . Background technique [0002] The battery pack shell (also known as battery tray, battery box, etc.) is the carrier of the BMS, battery module, high-voltage charge and discharge circuit and cooling system in the battery pack. It is an important structural component of the battery pack for new energy vehicles. The carrier plays a key role in safety protection. At present, the weight of aluminum battery pack casings is generally lighter than that of steel battery pack casings. In order to meet the specific energy requirements in the national subsidy policy, even if the cost of aluminum battery pack casings is high, the battery casing The...

AI Technical Summary

Problems solved by technology

[0003] In Chinese patent 201910985769.6, although ultra-high-strength hot-formed steel is used for the frame beam (frame) of the battery pack casing, it is made of at least two mutually joined profile members in the cross section. This combined frame beam is not conducive to light weight. Quantification, cost and quality stability; at the same time, the load-bearing body of the battery pack case is designed as a basin-shaped part, which leads to the excessive wall thickness of the side wall of the battery pack case, which is also not conducive to the lightweight of the battery pack case and cost

[0004] In Chinese patent 201910323812.2, although the roll-formed frame beam (frame) of the battery pack casing is integrated, it does not use ultra-high-strength steel (if ultra-high-strength steel is used, it is difficult to produce an integrated frame with a single roll-forming process) Frame beam), which is not conducive to the lightweight of the battery pack shell; at the same time, the structure of the frame beam (frame) and the bottom of the battery pack shell can only be connected by bonding (adhesive) process, but the bonding process has low strength, It is prone to aging and fatigue, so the connection between the frame beam (frame) and the bottom of the battery pack case is less safe, not conducive to mass production, and the cost is higher

[0005] The existing battery pack casing is mainly made of aluminum alloy, but major car companies have an urgent need for weight reduction and cost reduction for battery pack casings. Compared with aluminum, steel has a cost advantage, and ultra-high-strength steel is used Theoretically, the steel battery pack shell may be lighter than the aluminum battery pack shell, but there is no steel battery pack shell product or patent with a better structure or process that uses ultra-high-strength steel. A gap needs to be filled

Images