Battery pack

Abstract

The invention discloses a battery pack installed on a new energy vehicle, and relates to the technical field of electric vehicle battery packs. The battery pack comprises a lower shell, a battery bottom plate and an upper shell, the battery bottom plate is arranged in the lower shell, the upper shell is fixedly arranged at the top end of the lower shell, the upper shell comprises a shell cover, structure reinforcing plates and heat dissipation holes, the top end of the lower shell is in threaded connection with the shell cover, and the top of the shell cover is provided with a plurality of structure reinforcing plates and a plurality of heat dissipation holes. When in use, a plurality of single batteries are mounted on the battery bottom plate, the single batteries are connected in parallel or in series, the upper shell plays a role in supporting and fixing, the heat dissipation holes play a role in heat dissipation, and the lower shell is of a hollow structure, so that not only can the structural weight be reduced, but also heat preservation and air circulation cooling can be carried out; therefore, temperature control of the battery pack is ensured, and faults caused by overheating of batteries are avoided. Under the condition of guaranteeing the structural strength of the battery pack, the weight of the battery pack is effectively reduced, so that the performance of an electric vehicle is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of electric vehicle battery packs, and in particular to a battery pack. Background technique [0002] As an important part of new energy vehicles, the battery pack system provides all the energy for the driving of electric vehicles. It usually consists of one or more battery modules and a control system. Since the battery pack system is installed on the car, it will encounter Various operating conditions, so the overall safety and reliability of the battery pack system are very important design reference factors. The battery pack system generally accounts for about 30% of the new energy vehicles, and the upper shell of the battery pack And the lower case of the battery pack accounts for more than 30% of the total weight of the battery pack, which is difficult to use. [0003] The upper shell of the traditional battery pack is made of steel, which adopts sheet metal stamping process. ...

AI Technical Summary

Problems solved by technology

[0002] As an important part of new energy vehicles, the battery pack system provides all the energy for the driving of electric vehicles. It usually consists of one or more battery modules and a control system. Since the battery pack system is installed on the car, it will encounter Various operating conditions, so the overall safety and reliability of the battery pack system are very important design reference factors. The battery pack system generally accounts for about 30% of the new energy vehicles, and the upper shell of the battery pack and the lower shell of the battery pack account for more than 30% of the total weight of the battery pack, making it difficult to use

[0003] The upper shell of the traditional battery pack is made of steel, which adopts sheet metal stamping process. The weight of the formed part is heavy, and due to the process, it is easy to produce hidden defects, such as cracks and wrinkles. The protection performance of the battery pack is seriously affected. The traditional lower box is made of steel, and the sheet metal stamping welding process is adopted. The welding deformation will cause dimensional errors, which will affect the assembly and sealing performance of the battery pack. At the same time, common defects in welding will seriously affect the battery pack. safe, causing seal failure

[0004] At present, the application of the existing composite material lightweight technology in the battery pack system is limited to the upper casing of the battery pack, and is limited to chopped glass fiber reinforced resin or SMC materials. On the premise of meeting the rigidity and strength requirements, the weight reduction effect is limited, and The current lightweight method of the lower case is mainly aluminum alloy instead of sheet metal, and the current application technology of some composite materials in the lower case obviously does not consider the safety and reliability of the battery pack, ignoring the designability and performance of composite materials advantages and disadvantages; to address these defects, it is necessary to design a high-strength and lightweight battery pack shell

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