Thermal management method and thermal management device of power lithium ion battery system

Abstract

The invention discloses a thermal management method and a thermal management device of a power lithium ion battery system. The thermal management method includes placing at least one portion of at least one thermal conductive film into a selected area of a lithium battery box internal cavity, and heat transfer connection of the at least one thermal conductive film and a cooling and / or heating device placed outside a lithium battery box, wherein the selected area contains one or more power lithium battery pack. Preferably, the lithium battery box is further provided with a heat insulation material for insulating the selected area of the lithium battery box internal cavity and the remaining area of the lithium battery box internal cavity and / or the surrounding environment of the lithium battery box. With the thermal management method and the thermal management device, rapid uniform heating or cooling of the power lithium ion battery system can be achieved, the cost is low, the operationis easy, the temperature of the power lithium ion battery system can be effectively controlled, and the working performance and safety of the power lithium ion battery system can be improved.

Description

technical field [0001] The present invention particularly relates to a thermal management method and a thermal management device for a power lithium-ion battery system, especially a high-efficiency cooling / heating method for a lithium-ion battery, which belongs to the technical field of new energy. Background technique [0002] "Smog" has seriously affected people's daily life, and the exhaust emission of fuel vehicles is one of the main reasons for the formation of smog. Lithium-ion battery has become an ideal power source for a new generation of electric vehicles due to its excellent performance. It has the advantages of light weight, large energy storage, high power, no pollution, no secondary pollution, long life, and small self-discharge coefficient. An ideal car battery. [0003] Lithium-ion batteries will generate a lot of heat when they work for a long time, which will cause a large temperature rise of the battery cells. Excessive temperature of the battery core wi...

AI Technical Summary

Problems solved by technology

If the temperature of the battery is too high, the electrolyte will decompose, causing volume expansion and deformation of the battery, and even explosion and other serious problems.

The solution at the present stage is: (a) air cooling (referring to CN105957986A): that is, a micro fan is installed in the battery pack to carry out forced convection. Because the space in the battery pack is limited, the temperature uniformity effect is very unsatisfactory; (b) liquid cooling ( Refer to CN106025425A): That is to add circulating fluid under the battery pack and then cool down through the refrigerator, the effect is general and seriously affects the compactness of the battery pack

In addition, in hot summer, the heat radiation from the hot environment and the surface environment to the lithium battery box increases the temperature of the battery core, which also seriously affects the use of lithium-ion batteries.

[0004] In addition, lithium-ion batteries have problems such as short discharge time and limited charging at low temperatures, which leads to short mileage of lithium-ion battery electric vehicles in winter or cold areas, which limits their widespread popularity The normal use of electronic components (such as video cameras / cameras) of lithium-ion batteries in harsh environments (such as the North and South Poles)

The current way to solve this problem is to use a heating device (such as a fluid heating device, an electric heating plate device) to externally heat the lithium-ion battery, but this method has many disadvantages, such as: (1) It is necessary to fix the heating device and the battery. , which increases the weight of the battery and complicates the structure; (2) the heat generated by the heating device is generally transferred through circulating air, and the heating efficiency is not high; (3) if the heat is transferred to the inside of the battery through the bottom pole, the temperature distribution of the battery will be uneven , will reduce battery life

Images