Heat exchange device for lithium ion battery of electric automobile

Abstract

The invention discloses a heat exchange device for a lithium ion battery of an electric automobile. The heat exchange device comprises an upper battery bracket (1) and a lower battery bracket (4) fixedly connected with the upper battery bracket (1); a plurality of electric cores (5) are arranged between the upper battery bracket (1) and the lower battery bracket (4); heat exchange pipes (3) are arranged among the electric cores (5); flowing liquid is filled inside the heat exchange pipes (3); and heat conduction glue (2) is filled among the electric cores (5), and between the electric cores (5) and the heat exchange pipes (3). With the adoption of the heat exchange device provided by the invention, a heat exchange effect is improved and the service life of the battery is prolonged; the adjacent pipelines inside the heat exchange pipes are separated by a layer of pipe wall, so that the sufficient heat exchange is realized, and the temperature difference of the both ends of the heat exchange pipes can be avoided; and meanwhile, the sectional area of the pipelines is reduced due to metal partition inside the heat exchange pipes, the flow speed of the liquid is increased and the convection heat exchange efficiency is improved.

Description

technical field [0001] The invention relates to a liquid heat exchange device, in particular to a heat exchange device for a lithium ion battery of an electric vehicle. Background technique [0002] Since Armand proposed the concept of Rocking Chair Batteries in 1980, the positive and negative materials of lithium batteries no longer use metal lithium, but active materials that can freely deintercalate lithium ions, thus solving the problem of poor safety and charging and discharging of secondary lithium batteries. Short life two technical problems. Compared with secondary batteries such as nickel-hydrogen, nickel-cadmium and lithium batteries, lithium-ion batteries have the advantages of high working voltage, high specific energy, long charge and discharge life, low self-discharge rate, good safety and no memory effect. There are more and more applications in aviation, aerospace, military and civilian electric vehicles. [0003] However, lithium batteries are very sensiti...

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Problems solved by technology

[0005] 1) At present, the gas heat exchange method is widely used in automotive power batteries. Compared with liquid heat exchange, gas heat exchange is safe and reliable. However, due to the small specific heat capacity and thermal conductivity of gas, the heat exchange effect is not ideal, which restricts lithium ion technology. Promotion and use of batteries;

[0006] 2) At present, the heat exchange of electric vehicle power batteries mostly arranges the heating or cooling source at one end of the battery system, and the heat exchange medium will produce a temperature difference of more than 7°C from the head end to the end of the heat exchange path, resulting in inconsistent battery temperatures. Capacity reduction

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