Power battery cooling system based on core-cladding-structure composite phase-change heat storage layer

Abstract

The invention discloses a power battery cooling system based on a core-cladding-structure composite phase-change heat storage layer. The power battery cooling system comprises a system shell, battery unit modules, heat storage modules, an upper cover plate and a lock screw, wherein the battery unit modules and the heat storage modules are distributed in the shell in a layered and staggered manner, and the upper cover plate and the lock screw are used for realizing assembling and positioning; each heat storage module wholly adopts a core-cladding structure and comprises an outer sealing shell and a composite phase-change material, the outer sealing shell is positioned at the outer layer of each module and made of a high polymer material, the inner chamber of the outer sealing shell is filled with the composite phase-change material in a vacuum manner, and the composite phase-change material is formed by mixing a heat conduction material and a paraffin type phase-change material; the curing temperature of the high polymer material is set to be higher than the phase change temperature of the composite phase-change material, and a certain vacuum clearance is retained in the inner chamber of the outer sealing shell made of the high polymer material for the composite phase-change material. According to the power battery cooling system, the heat storage modules which are convenient to operate and control and can circularly charge and discharge heat. Compared with the prior art, the power battery cooling system effectively solves the problems of difficult sealing and expansion pressure likely caused by the phase-change material.

Description

technical field [0001] The invention belongs to the related field of power battery accessories, and more specifically relates to a power battery cooling system based on a composite phase-change heat storage layer with a core-clad structure. Background technique [0002] With the shortage of traditional fossil energy, hybrid vehicles and pure electric vehicles are becoming more and more popular due to their energy saving and environmental protection, and power batteries are one of the core components of electric vehicles, providing power energy for power vehicles, and their working conditions are directly affect the operation of electric vehicles. One of the important factors affecting the working performance of the power battery is the temperature of the power battery. At present, power batteries widely used in electric vehicles are mainly divided into storage batteries and fuel cells. When the power battery is working, the battery will generate a large amount of heat under...

AI Technical Summary

Problems solved by technology

Since the thermal conductivity of organic phase change materials and inorganic salt phase change materials is usually relatively low, and the density of phase change materials in solid and liquid states is usually different, it usually occurs when heated and melted, such as 5%-20% Therefore, the current power battery cooling technology based on phase change materials mainly has the following defects or deficiencies: First, the latent heat of phase change materials is limited, when the phase change material is heated by the power battery module and completely melted , the phase change material can no longer absorb a large amount of heat, and the power battery will no longer be able to continue to work, otherwise the temperature of the battery module will rise rapidly until the battery is burned; at this time, the power battery must stop working, and the phase change material in the battery cooling module The battery can continue to work after being cooled and solidified by the environment; second, because the thermal conductivity of the phase change material is very low, and there are battery modules around the phase change material, it will take a long time for the phase change material to cool from the liquid state to the solid state. For a period of time, it is difficult to meet the actual long-term continuous work requirements of power batteries; third, the sealing problem of the cooling system in the current cooling technology of power batteries based on phase change materials is difficult to solve, in order to prevent phase change materials from becoming liquid After a leak occurs, the power battery cooling system is usually strictly sealed, but because the phase change material will expand in volume when the solid-liquid phase transition occurs, and the sealed environment will cause the pressure caused by the volume expansion to be applied to the power battery. On the module, this will cause hidden dangers to the safe use of the battery and the battery life

Images