Sandwich structure bottom plate of power battery lower box body and power battery lower box body

Abstract

The invention aims to provide a sandwich structure bottom plate of a power battery lower box body and the power battery lower box body. The sandwich structure bottom plate comprises a water cooling system (3.4), a steel stamping lower bottom plate (3.6) and a carbon fiber plate (3.1) which are arranged in a layered manner from top to bottom, the water cooling system (3.4) comprises at least one water cooling plate, hanging lug through holes (3.4.9) are distributed in the water cooling plate, pressing rivet nuts (3.3) are distributed on the stamping lower bottom plate (3.6), water cooling platefixing bolts (3.5) penetrate through the hanging lug through holes (3.4.9) to be connected with the pressing rivet nuts (3.3) so as to fix the water cooling plate to the stamping lower bottom plate (3.6); the carbon fiber plate (3.1) is fixed on the stamping lower bottom plate (3.6) in a manner of adhesive connection; and bottom plate fastening bolts (3.2) used for external connection are distributed on the stamping lower bottom plate (3.6). Corrosion resistance and stone impact resistance of the bottom of the box body can be improved, the maintenance is convenient, the mechanical performanceis good while light weight is achieved, and the structural rigidity is high.

Description

technical field [0001] The invention belongs to the field of power batteries, and in particular relates to a bottom plate of a sandwich structure of a power battery lower box and a power battery lower box. Background technique [0002] At present, the power battery system mostly adopts the lithium battery module integrated in the casting / sheet metal / profile box. The casting technology is mature and the cost is low, but the weight of the casting box is large, resulting in low group efficiency of the battery system; the sheet metal technology improves the defect of the heavy weight of the casting box, but its assembly process is complicated and the sealing design of the box is complicated; the aluminum profile technology improves To overcome the shortcomings of the two, it is widely used in battery system boxes, but its cost is high, the impact resistance of the bottom is insufficient, and the space utilization rate is not high. [0003] Chinese patent CN110380153A discloses ...

AI Technical Summary

Problems solved by technology

In the above scheme, the lower base plate is made of aluminum material, which has insufficient impact resistance, which may easily lead to damage of the water cooling plate and internal short circuit of the battery system. The FDS (Full Melt Self-Tapping Riveting) technology is used to connect the water cooling plate, which may easily cause the water cooling plate to crack

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