Battery box with waterproof structure

Abstract

The invention provides a battery box with a waterproof structure, comprising a battery box upper cover and a battery box lower body connected by fasteners, a sealing strip is arranged between the battery box upper cover and the battery box lower body, the The edge of the upper cover of the battery box has a stepped structure that is bent downward twice and turned outward once, forming sequentially connected first upper cover lower bend, upper cover outer flange and second upper cover lower bend. The edge of the lower box of the battery box is turned inward as a whole and then bent upwards, then pressed down to the dead edge and then turned outwards to form a sequentially connected lower box inner flanging, lower box upper bending, lower box The top crimped edge and the outer edge of the lower box. In the present invention, the sealing strip is installed in the closed space formed by the bending and flanging of the upper cover of the battery box and the lower box body of the battery box, which can prevent the sealing strip from extending to both sides and ensure the compression of the sealing strip. The distance from the bottom of the bend to the flange in the lower box is used to adjust the compression of the sealing strip.

Description

technical field [0001] The invention relates to the technical field of lithium batteries for automobiles, in particular to a waterproof structure for a battery box. Background technique [0002] The manufacturing process of the battery box for an electric vehicle includes: first connecting a plurality of batteries in series and / or in parallel to form a battery module, and then connecting a plurality of battery modules in series and / or in parallel to form a battery box. The battery box is the power source of electric vehicles and is its core component. The safety of the battery box directly affects the safety of the entire vehicle. [0003] According to different cooling methods, the battery box includes water-cooled battery box and air-cooled battery box. Since the output voltage of the battery box for electric vehicles is as high as 200V, and the intrusion of water will cause a short circuit, the battery box must be strictly sealed to prevent water from entering. , The pro...

AI Technical Summary

Problems solved by technology

[0005] First, the protection level that this sealing structure can achieve is generally below IP66, which cannot meet the higher protection level requirements:

[0006] Second, for a battery box with a large box volume, the gasket is generally made of multiple gaskets, and seal failure is prone to occur at the interface between the gasket and the gasket;

[0007] Third, the sealing gasket is locked and compressed between the upper cover and the lower box, which is prone to excessive or insufficient compression of the gasket, resulting in seal failure;

[0008] Fourth, the gasket extends to both sides during the compression process, so that the gasket does not reach the required compression amount after being locked in place, thus affecting the sealing performance

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