electric car

Abstract

An electric vehicle, which includes a battery pack, the battery pack includes a casing and a plurality of battery cells placed in the casing, an insulating and heat-conducting liquid is poured into the casing, and an outlet and an inlet are opened on the casing , the insulating and heat-conducting liquid can return to the inlet through the outlet through the external cooling device, a pump for driving the flow of the insulating and heat-conducting liquid is arranged between the outlet and the inlet, and by pouring the insulating and heat-conducting liquid into the battery case, So that when the battery cell is inflated or leaks, the electrolyte is isolated from the air, and no combustion or explosion will occur; the insulating heat-conducting liquid itself can absorb the heat of the battery cell, and an external circulation path is set up for the insulating heat-conducting liquid. The outgoing insulating and heat-conducting liquid can be quickly cooled by the external cooling device arranged on the external circulation path. Therefore, the entire battery pack has the characteristics of good cooling effect and safety, thereby improving the safety of the electric vehicle.

Description

[0001] [technical field] [0002] The invention relates to an electric vehicle, in particular to an electric vehicle with an external cooling system for a battery pack. [0003] [Background technique] [0004] 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. [0005] At prese...

AI Technical Summary

Problems solved by technology

[0006] 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

Images