Battery internal circulation heat management system

Abstract

The invention discloses a battery internal circulation heat management system. The system comprises a graphene sleeve applied to the surface of a battery and groups of annular heat circulating tubes sleeved by the graphene sleeve, each annular heat circulating tube comprises a liquid containing segment, a heat absorption evaporation segment, a condensation recovery segment and a backflow segment in enclosed connection, the heat absorption evaporation segment is applied to the side, close to the surface of the battery, of the wall of the graphene sleeve and is internally filled with water absorption fibers in vertical arrangement, and the condensation recovery segment is positioned over the liquid containing segment. According to the disclosed battery internal circulation heat management system, the water absorption fibers capable of drainage without power absorb heat of the battery so that a penetration work medium pentane is evaporated to take away heat of the battery, the work mediumis then condensed and recovered, so that the work medium is used in a stereoscopic circulated way, heat accumulation is reduced, the service life of the battery is prolonged, and a good work temperature environment is provided for the single battery.

Description

technical field [0001] The invention relates to the field of electric vehicle batteries, in particular to a heat management system for internal circulation of batteries. Background technique [0002] With the diversification of the automobile industry and the increasingly severe environmental problems, the new energy automobile industry is developing rapidly. New energy vehicles are the trend of automobile development today, and electric vehicles account for a large proportion of new energy vehicles. The country also attaches great importance to the field of electric vehicles. Among them, electric vehicles have a smaller impact on the environment than traditional vehicles, and are used more and more widely. Electric vehicles refer to vehicles powered by vehicle-mounted power supplies, driven by motors, and meeting the requirements of road traffic and safety regulations. Batteries serve as The heart of electric vehicles is the key to the development of the electric vehicle i...

AI Technical Summary

Problems solved by technology

[0005] The existing battery thermal management system uses the vaporization of low-boiling-point phase-change materials to absorb the heat generated by the battery to reduce the operating temperature of the battery. Low-boiling-point phase-change materials can indeed achieve a good heat dissipation effect on the battery, but Since the existing battery thermal management system does not have a corresponding recovery device for the vaporized phase change material, a large amount of phase change material will be wasted during cooling, causing environmental pollution and high cost, and the cooling system itself is also A large amount of phase-change materials need to be stored, which also increases the cost. When the battery is discharged at high power, the heat dissipation efficiency cannot meet the requirements; the invention patent with the patent publication number of CN 105552476 A discloses a battery pack thermal management system, which solves the problem of battery The heat dissipation problem of the package is also very cost-saving, but there are still some problems: the cooling material of the box transformer cannot achieve unpowered drainage, and it needs to be filled with liquid at the same height as the battery to ensure the heat dissipation effect; the heat dissipation effect of the top plate condensation plate is limited , taking air cooling as an example, the contact area between the cold air and the condensation plate is limited; the heat conduction effect of the liquid in the liquid cooling plate is far less than that of the capillary copper tube group, and the evaporation speed is relatively slow under the same conditions, and the heat dissipation effect is poor; the condensation area of ​​the liquid top plate , the backflow method and confluence area are limited and the heat dissipation effect is not good; when the phase change coolant in the cavity shakes violently during driving, it is easy to enter between the upper roof and the condensation plate in large quantities, resulting in a decrease in the liquid level in the cooling tank , affecting the cooling effect

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