Method and device for cooling and heating power cell of electric automobile

Abstract

The invention discloses a method and a device for cooling and heating a power cell of an electric automobile based on phase-change slurry circulation. A phase-change material is subjected to micro-nano capsule encapsulation, and then, is prepared into phase-change slurry together with a liquid solvent; the phase-change slurry is subjected to heat exchange closed circulation between a power cell encapsulating chamber and an air conditioner compartment chamber of the electric automobile; and the transfer beneficial flowage of heat between the cell encapsulating chamber and the air conditioner compartment chamber is achieved by utilizing the heat absorption or the heat release phenomenon of the phase-change material occurring in a heat exchange solid-liquid phase-change process. The method and the device for cooling and heating the power cell of the electric automobile are the temperature control and the heat management techniques of the power cell of the electric automobile, and the cooling problem in the condition of a high-temperature climate (an ambient temperature is more than 40 DEG C) and the heating problem in the condition of a low-temperature climate (the ambient temperature is less than 0 DEG C) for the power cell of the electric automobile can be effectively solved.

Description

Technical field: [0001] The invention belongs to the technical field of thermal management of electric vehicle power batteries, and specifically relates to the cooling and heating technology of electric vehicle power batteries under high-temperature climate (temperature greater than 40°C) and low-temperature climate (temperature less than 0°C). technical background: [0002] The operating temperature of electric vehicle power batteries needs to be maintained within a certain range (for example, lithium batteries are generally 10°C-50°C). If the temperature is too high, the service life of the battery will be reduced, and safety problems such as explosion may occur. If the temperature is too low, the working performance of the battery will be reduced, and the low temperature may also damage the electrolyte of the battery and cause the battery to be discarded [1，2] . At present, the thermal management of electric vehicle power batteries is generally to cool the battery by ext...

AI Technical Summary

Problems solved by technology

[0003] When the car air conditioner is turned on, the temperature of the car air-conditioning compartment is generally 18°C-24°C. Under the above-mentioned high or low temperature climate conditions, the battery can be cooled or heated by extracting the air in the air-conditioning compartment, such as Honda's Insight and Toyota's Prius hybrid electric car [3] , but this method has two serious disadvantages. First, if the extracted air is directly discharged into the environment after heat exchange by the battery pack, it will cause a lot of waste of energy; if the extracted air is returned to the air-conditioned cabin after heat exchange by the battery pack The air quality between the air-conditioned cabins is greatly reduced

Secondly, due to the air duct communication structure between the air-conditioned cabin and the battery packaging room in this method, this will greatly increase the safety risks of passengers in the air-conditioned cabin (such as fire / explosion, etc.)

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