Electric automobile

Abstract

The invention discloses an electric automobile. The electric automobile comprises a battery pack, wherein the battery pack comprises a shell and a plurality of single batteries which are disposed in the shell; insulation heat conduction liquid is poured into the shell; an outlet and an inlet are formed in the shell; the insulation heat conduction liquid flows through the outlet and returns back to the inlet through an external cooling device; a pump, which is used for driving the insulation heat conduction liquid to flow, is arranged between the outlet and the inlet; the insulation heat conduction liquid is poured into the battery shell, so that electrolyte is isolated from air and combustion and explosion are avoided when the single batteries expand or leak liquid; the insulation heat conduction liquid can absorb heat of the single batteries per se; an external circulation path is arranged for the insulation heat conduction liquid; the circulated insulation heat conduction liquid can be quickly cooled by the external cooling device which is disposed on the external circulation path, so that the overall battery pack has the characteristics of good cooling effect and relatively high safety, thus the safety of the electric automobile is improved.

Description

[technical field] [0001] The invention relates to an electric vehicle, in particular to an electric vehicle with an external cooling system for a battery pack. [Background technique] [0002] With the decrease of petroleum resources and the seriousness of environmental pollution, environmental protection, energy saving and emission reduction have become the trend and trend of the world. In this context, in recent years, electric vehicles (mainly including hybrid electric vehicles, plug-in hybrid electric vehicles, and pure electric vehicles) with batteries as the main power source or part of the power source have gradually appeared and increased. The carbon emissions of electric vehicles The carbon emissions of pure electric vehicles are even zero, and they have the characteristics of high energy conversion efficiency, which makes people regard electric vehicles as an important choice to replace internal combustion locomotives in the future. [0003] At present, the power o...

AI Technical Summary

Problems solved by technology

[0004] For battery packs of large pure electric vehicles, especially lithium-ion battery packs, the battery pack is mainly composed of soft-packed lithium-ion battery cells. This design has the following problems. First, the cooling design of the entire battery pack is a difficult problem , the current method has two mainstream methods: air cooling and liquid cooling. For air cooling, the airflow brought by the vehicle is used to cool the battery pack. The air cooling design is cheap, but the effect is poor, especially in summer This is especially true when the air temperature is high; for liquid cooling, a cooling liquid pipeline surrounding the battery is generally installed in the battery pack, and the cooling fluid flows through the pipeline to cool the battery around the pipeline. The effect is generally better than air cooling, but its design is difficult and expensive, and when the coolant absorbs enough heat, there is no special cooling device for the heated coolant outside the battery pack, or the external cooling device is too Simple (e.g. just a heatsink with air cooling)

This will cause the coolant to become hot after using it for a long time, but it cannot dissipate the heat quickly outside the battery pack, resulting in poor cooling effect

Secondly, the soft-pack lithium-ion battery generates heat during use, which is prone to flatulence, electrolyte overflow, etc., and the overflowed electrolyte will burn when exposed to air, and even cause an explosion

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