Novel heat management system for vehicle-mounted lithium ion batteries

Abstract

The invention relates to a novel heat management system for vehicle-mounted lithium ion batteries. The system comprises square lithium iron phosphate battery modules, heat dissipation cold plates, tree branch type upper-layer fluid distribution pipeline plates and distribution pipeline cover plates, wherein upper-layer fluid distribution pipelines and the cover plates are combined vertically, outlets of the distribution pipelines are connected with the heat dissipation cold plates respectively, and the heat dissipation cold plates and the batteries are arranged alternately. Each set of the system comprises the upper pipeline and the lower pipeline, fluids in the pipelines in the cold plates adjacent to the batteries are opposite in flow direction, and the upper cover plate and the lower cover plate are both provided with an inlet. Cooling liquid is distributed in the cold plates through tree branch type manifolds in the distribution pipelines, each cold plate is internally provided with three heat dissipation pipelines, and the cooling liquid flows out together from side outlets of the cold plates. By means of the system, the temperature of the vehicle-mounted power batteries can be effectively reduced, the problem that the internal temperature difference is large when the battery modules discharge is solved, the temperature uniformity in the battery modules can be guaranteed,and meanwhile, the system is compact in structure and suitable for automobiles with limited space and the like.

Description

technical field [0001] The invention relates to a thermal management system of a vehicle-mounted lithium-ion battery, in particular to a thermal management system of a tree-branch-type vehicle-mounted lithium-ion battery. Background technique [0002] With the rapid development of the automobile industry, automobiles bring people's life fast and convenient, but also bring many serious problems to human beings. As a result, electric vehicles have been greatly developed. As the power source of electric vehicles, lithium-ion batteries, the temperature has a very significant impact on its overall performance. First of all, due to the inconsistency of temperature, the state of each cell in the battery pack is inconsistent, which makes individual cells appear overcharged and overdischarged. Overcharging and overdischarging will damage the battery and shorten the battery life. Second, the battery is very sensitive to temperature. When the temperature is above 40°C or 50°C, the ba...

AI Technical Summary

Problems solved by technology

First of all, due to the inconsistency of temperature, the state of each monomer in the battery pack is inconsistent, which makes individual monomers overcharge and overdischarge.

Overcharging and overdischarging will damage the battery and shorten the battery life.

Second, the battery is very sensitive to temperature. If the temperature is above 40°C or 50°C, the battery life will rapidly decay

The process of a phase change material changing from solid to liquid or from liquid to solid is called a phase change process. At this time, the phase change material will absorb or release a large amount of latent heat. From the point of view, the battery cooling system using phase change materials has a bright prospect, but due to the high price of phase change materials, it has not been widely used in electric vehicles at present.

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