Thermal management system for power battery of pure electric vehicle

Abstract

The invention relates to a thermal management system for a power battery of a pure electric vehicle. The thermal management system comprises a battery module, a radiator, a magnetic pump, an external circulating pipeline, a heat exchange element, a heater, a temperature sensor and a central controller, wherein the heat exchange element is a heat-conducting silicone tube tape of which an inner cavity is filled with a cooling liquid; the heat-conducting silicone tube tape is attached to a single battery; the external circulating pipeline is sequentially connected with the heater and a decompression valve in parallel through a two-position three-way electromagnetic valve; the external circulating pipeline between the heater and the decompression valve is sequentially connected with a cooling liquid filter and the magnetic pump in series; the external circulating pipeline is communicated with the heat-conducting silicone tube tape through a composite variable-diameter joint; and the heat-conducting silicone tube tape is also provided with an electromagnetic directional valve. The thermal management system is simple in structure, novel in design, high in heat exchange efficiency, good in heat dissipation effect, safe and reliable to use, relatively economical and practical and good in sealing effect; and the lifetime of the power battery is further prolonged; and the charge-discharge efficiency of the power battery is further improved.

Description

technical field [0001] The invention relates to the field of pure electric vehicle power batteries, in particular to a pure electric vehicle power battery thermal management system. Background technique [0002] Battery Electric Vehicle (BEV) is an indispensable means of transportation for the cleanest, most efficient and sustainable development of our 21st century. The development of pure electric vehicles is an inevitable trend, because it can use electric energy generated by sustainable energy sources, such as lithium batteries, or hydrogen fuel cells, etc., are some sustainable energy sources. The research and development of pure electric vehicles involves many technical fields, covering a wide range and is also very complicated. But in the final analysis, how to make the performance of the power battery fully play is a recognized technical difficulty. To overcome this difficulty, we must See how to create a stable and suitable working environment for the power battery,...

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly the following types of thermal management technologies for power batteries at home and abroad: complete air cooling, which is the simplest method, but it cannot control the sudden rise and fall of the ambient temperature, and is basically not recommended in the industry; the air temperature is controlled by the compressor , to keep the temperature of the battery stable through air flow. Although this scheme is not very accurate, it can achieve auxiliary heating and cooling. In some schemes, substances with high heat conduction such as silicone oil are attached to the surface of the battery to enhance the efficiency of conduction. However, it is difficult to achieve constant temperature or stable temperature fluctuations; liquid pipes are arranged inside the battery module, and direct liquid cooling is used. This solution is more accurate in temperature control, but the cost is high, the internal pipeline is complicated, and the control requirements for liquid fluidity are high.

Among them, the battery cooling method adopted by Tesla belongs to the third type, and its structure is composed of: aluminum tube belt (hollow 4 flow channels), silicone heat conduction paste, cooling liquid (a mixture of ethylene glycol and distilled water), but no active power cycle equipment, resulting in poor heat dissipation in the battery module, and when the battery is discharged at high power, the accumulated heat cannot be effectively released

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