A thermal management device for a combined electric vehicle power battery

Abstract

The present invention discloses a heat management device of a combined electric car power battery. Each battery cell and cooling and heating system thereof form a module, the whole device can performmodule combination according to the quantity of the power batteries. The periphery and the bottom portion of each module are coated with phase-change materials, snake-shaped copper tubes containing cooling working fluids are buried in the phase-change materials, the snake-shaped copper tubes, a condenser pipe and a booster pump form a liquid cooling heat dissipation system of the device, the outerhousing of the box body is provided with a switched parallel ventilation structure, the wind flow is employed to take away the heat on part of the phase-change materials and the copper tubes when heat dissipation is performed. At a low temperature, a ventilation port at the outer housing of the box body is closed, a battery box forms a closed space, the battery is heated through a resistance wireto ensure the battery working and the proper temperature, a temperature sensor detects the temperatures of the phase-change materials, a controller is employed to achieve switching of different heatdissipation modes or heating modes, and the flow speeds of the cooling working fluids are regulated according to the quantity of the battery modules and the actual environment, and therefore, the application range is wide.

Description

technical field [0001] The invention belongs to the field of power battery thermal management, relates to a power battery thermal management technology, in particular to a combined electric vehicle power battery thermal management device. Background technique [0002] With the development of electric vehicles, its power batteries have also been developed from lead-acid batteries to Ni-MH batteries and Li batteries. As an electric vehicle power battery, two requirements of high power and high capacity must be guaranteed to meet the power and endurance requirements of electric vehicles. The battery will undergo complex chemical reactions during the charging and discharging process. The complex chemical reaction is often accompanied by the generation of a large amount of heat, especially in summer, the generation of a large amount of heat will not only greatly shorten the service life of the battery, but also cause overheating, burning , explosions and other serious threats to...

AI Technical Summary

Problems solved by technology

The present invention needs to solve two technical problems, one is to solve the problem that the battery temperature rises and the life of the battery is shortened due to the excessive heating caused by the large current during charging and discharging of the electric vehicle, and the other is to solve the problem that the external temperature is too low in winter in the alpine region Problems that lead to a sharp drop in the depth of discharge

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