Electric vehicle power battery lower case

Abstract

The invention discloses a lower casing of a power battery of an electric vehicle, comprising: a front bracket of the lower casing, a rear bracket of the lower casing, two side brackets of the lower casing arranged on both sides of the front bracket of the lower casing and the rear bracket of the lower casing, a water inlet, and a water outlet. In the space enclosed by the front support of the lower case, the rear support of the lower case, and the two side supports of the lower case, there is at least one hollow inner support of the lower case extending from the front support of the lower case towards the rear support of the lower case. The bracket is provided with a lower shell cooling liquid channel connected to the lower surface of the top plate of the lower shell inner bracket, the lower shell cooling liquid channel extends from the lower shell front bracket to the lower shell rear bracket, and at least the lower shell cooling liquid channel communicates with the water inlet , at least the cooling liquid channel of the lower case communicates with the water outlet. The invention integrates the cooling liquid channel into the lower shell, reduces the number of structural parts, improves the reliability of the structure, reduces the number of assembly parts, reduces the size of the battery pack in the height direction, and improves the ride comfort of the vehicle.

Description

technical field [0001] The invention relates to the technical field related to electric vehicles, in particular to a lower casing of a power battery of an electric vehicle. Background technique [0002] There are electric vehicles with battery pack temperature control system in the market, such as figure 1 As shown, in the prior art, the water-cooling pipeline or the water-cooling plate 1' is generally separately designed to cool the battery module 2'. The battery cold plate 1' is generally fixed on the lower case 4' through a supporting structure 3', such as foam, and a heat conduction layer 5' is arranged between the battery cold plate 1' and the battery module 2'. The existing structural design is complex and requires a high layout space, which is not conducive to improving the ride comfort of the vehicle. [0003] Disadvantages of existing technology: [0004] 1. The number of parts is large, the structure is complex, and the assembly process is cumbersome; [0005] ...

AI Technical Summary

Problems solved by technology

[0004] 1. The number of parts is large, the structure is complex, and the assembly process is cumbersome;

[0005] 2. The height direction (Z direction) takes up a lot of space, which affects the ride comfort of the vehicle level

[0006] 3. There are many parts and heavy weight, which is not conducive to the lightweight of the battery system and the improvement of the energy density of the system

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