Electric car power battery thermal management system

Abstract

The invention provides an electric car power battery thermal management system. The electric car power battery thermal management system comprises a thermoelectric plate heat exchanger, a radiator, a fan, a battery pack, a kettle, a first circulating water pump, a second circulating water pump and connecting pipelines. The thermoelectric plate heat exchanger comprises a first fluid channel, a second fluid channel, a first fluid inlet, a second fluid inlet, a first fluid outlet, a second fluid outlet, a thermoelectric module, a positive electrode and a negative electrode. One closed and independent fluid circulating system is formed by the thermoelectric plate heat exchanger, the battery pack, the kettle, the first circulating water pump and one connecting pipeline. The other closed and independent fluid circulating system is formed by the thermoelectric plate heat exchanger, the radiator, the fan, the second circulating water pump and the other connecting pipeline. The two closed and independent fluid circulating systems can circulate two kinds of fluid at different temperatures to cool or heat a power battery. The thermoelectric plate heat exchanger is adopted for heating and refrigerating the battery pack, a heating mode or a refrigeration mode can be switched only by switching the positive electrode and the negative electrode of a power source of the thermoelectric plate heat exchanger, and the electric car power battery thermal management system is of a practical and reliable heat management structure.

Description

technical field [0001] The invention relates to the field of thermoelectric technology, and relates to electric vehicle power battery technology, in particular to a heat management system for electric vehicle power battery. Background technique [0002] Cars have become an indispensable means of transportation in modern society. The research on new energy vehicles caused by the oil crisis has always been valued by automobile manufacturers and countries that use large automobiles. With the improvement of environmental protection requirements and stricter emission standards for automobiles, new energy vehicles have become one of the trends in automobile development, and have become a research and development project for major industrial countries and major automobile manufacturers. People not only study the whole vehicle, but also study its key components, including the research on the power battery of electric vehicles. The new energy vehicles we refer to refer to vehicles ...

AI Technical Summary

Problems solved by technology

Its disadvantages are: (1) Electric PTC heating consumes high energy consumption, which consumes power battery power, resulting in shortened mileage of electric vehicles; (2) cooling fan cooling radiator lacks the ability to quickly cool down, and the cooling range is limited, resulting in high heat of the power battery. The temperature is not effectively cooled and it is outside the optimum working temperature zone; resulting in a reduction in the service life of the power battery; (3) the risk of thermal runaway of the battery cannot be eliminated

However, its structure is complex and the system reliability is poor

In addition, the electric vehicle thermal management system lacks the function of heating up the battery, which makes the power battery easily lose its function in an extremely low temperature environment

[0006] Chinese patent CN102255115B discloses the technology of "using fan forced convection to cool and heat the battery". Although it has a simple structure, its disadvantages are: it belongs to passive thermal management, and the cooling effect is not ideal; in addition, its battery heating adopts the form of electric PTC , not only consumes battery power, but also heats unevenly, posing safety hazards

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