Lithium ion battery thermal management system

Abstract

The invention discloses a lithium ion battery thermal management system which comprises a battery pack shell and a lithium ion battery pack, and is characterized in that the lithium ion battery pack is formed by connecting a plurality of battery units through battery connecting pieces; a plurality of expanded surface heat exchangers are arranged in the battery pack shell, and densely distributed fins are arranged on the outer surfaces of the two sides of each expanded surface heat exchanger; porous heat-conducting fins are arranged on the outer sides of the fins, and rich pore structures are arranged in the porous heat-conducting fins; one side of the porous heat-conducting sheet clings to the battery unit; the battery pack shell is filled with a phase-change material, and the phase-change material is divided into a plurality of small areas by pores of the porous heat-conducting sheet and the fins, so that the influence of poor heat-conducting property of the phase-change material is reduced; a heat exchange mode of combining an expanded surface heat exchanger and a phase change material is adopted to realize integration of heat storage and heat exchange and temperature controllability in different environments; a plurality of flow channels are formed in the expanded surface heat exchanger and serve as heat exchange working medium flowing channels. The device can be widely applied to the fields of energy storage, electric power, automobiles and the like.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a thermal management system for lithium ion batteries. Background technique [0002] Due to intermittent and discontinuous problems in the use of mainstream new energy such as solar energy and wind energy, while the world is vigorously developing and utilizing solar energy and wind energy, the demand for energy storage technology is also increasing. Lithium-ion batteries are suitable for power-side energy storage because of their high energy density, good charging and discharging point performance, and high cycle life. However, due to the high power demand and the huge number of batteries, the energy storage on the power supply side has higher requirements on the performance, safety and life of the batteries than the batteries of electric vehicles. Among them, the temperature change of the battery during use is an important physical quantity that affects the performance, saf...

AI Technical Summary

Problems solved by technology

[0003] Existing lithium-ion battery thermal management technologies generally use air-cooling or water-cooling to dissipate heat from the battery, which has low heat dissipation efficiency and is difficult to meet the heat dissipation requirements of the battery

Moreover, the existing thermal management devices generally perform thermal management outside the battery pack, which will lead to poor temperature uniformity inside the battery, seriously affecting battery life, and the heating or cooling of the heat-exchanging medium takes a certain amount of time, and temperature control will occur. Hysteresis phenomenon, poor thermal management effect, when the temperature is too low in winter, the performance of the battery will drop, and it will be difficult to start; at the same time, the existing thermal management device has no heat storage capacity, and the energy will be quickly dissipated after shutdown, so that it needs to be restarted next time. Cooling or heating, greatly increasing energy consumption

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