Battery pack, and lower shell and manufacturing method thereof

Abstract

The invention discloses a battery pack, and a lower shell and a manufacturing method thereof. Through a first preassembled part, the end parts of two longitudinal beams are respectively positioned atthe two ends of a rear cross beam; the two ends of a front cross beam are respectively positioned at the end parts of the two longitudinal beams through second preassembling pieces; then, the longitudinal beams and the rear cross beam are stably connected through first connecting pieces; the longitudinal beams are stably connected with the front cross beam through the second connecting piece; andfinally, the bottom plate structure is arranged in the frame to obtain the lower shell. A preassembled structure is adopted to replace manual supporting operation, dislocation or deviation between structures due to hand shaking in the frame assembling process is effectively avoided, the frame assembling process is stably carried out, and the structural precision of the lower shell is greatly improved. Meanwhile, in the manufacturing process, a frame connecting structure is adopted to replace a traditional welding mode, so that the lower shell is produced with less welding or without a weldingprocess machine.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a battery pack, a lower case and a method for manufacturing the lower case. Background technique [0002] With the increasing maturity of new energy technology, new energy vehicles have gradually entered the public eye. New energy vehicles refer to vehicles that use non-traditional fuels as power sources, integrate vehicle power control and drive technologies, and form new technologies and new structures. The main core technology of new energy vehicles lies in battery modules. The safety and stability of battery modules directly determine the performance of the vehicle. [0003] The battery module is generally fixed on the vehicle body in the form of a battery pack. Wherein, the battery pack mainly includes an upper case and a lower case, the upper case is covered on the lower case, and the battery module is installed in the lower case. Therefore, the structural perfor...

AI Technical Summary

Problems solved by technology

However, in the manufacturing process, the welding method is adopted, which makes the manufacturing process of the lower shell complicated, which seriously affects the production efficiency of the lower shell

At the same time, during the manufacturing process, the front beam, longitudinal beam and rear beam are prone to misalignment or offset during alignment and matching, resulting in a serious decline in the structural accuracy of the obtained lower case, which seriously affects the stability and safety of the battery module.

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