Thermal switch based on liquid crystal elastomer and single-stage and multi-stage thermal management system of thermal switch
A technology of liquid crystal elastomer and thermal management system, applied in the field of thermal management, can solve the problems of large proportion of energy consumption, reduce related costs, occupy large space, etc., and achieve the effect of small footprint, no energy consumption, and cost reduction
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Embodiment 1
[0037] like figure 1 , a thermal switch 5 based on a liquid crystal elastomer, comprising a hot end substrate 2, a liquid crystal elastomer 3 and a cold end substrate 4; one side of the hot end substrate 2 is attached to the surface of a thermal management object 1; the One side of the liquid crystal elastomer 3 is closely attached to the other side of the hot end substrate 1 ; one side of the cold end substrate 4 is attached to the other side of the liquid crystal elastomer 3 . The thermal management object 1 , the hot end substrate 2 , the liquid crystal elastomer 3 and the cold end substrate 4 are in close contact with each other. The heat flow is transferred from the hot-end substrate 2 , the liquid crystal elastomer 3 and the cold-end substrate 4 to the outer surface of the cold-end substrate 4 through heat conduction, and finally conducts convective heat transfer with the ambient air. The director direction of liquid crystal elastomer molecules will change with temperat...
Embodiment 2
[0043] Such as image 3 , the thermal management object is a power battery. The power battery, the hot-end substrate, the liquid crystal elastomer and the cold-end substrate are closely attached in sequence. The operating temperature range of the power battery is -20-65°C; the liquid crystal elastomer is prepared based on the thiol-acrylate / thiol-ene click reaction, preferably liquid crystal monomers RM257 and RM82, and the flexible linker is EDDT and trivinyl crosslinker (TATATO).
[0044] When in use, when the temperature of the power battery is lower than 10°C, the molecular director of the liquid crystal elastomer is oriented parallel to the hot end substrate, and its thermal conductivity is small, which weakens the heat transfer capability, and less heat generated by the power battery is transferred to the environment. The temperature of the power battery is raised, and the thermal switch is in a closed state; when the temperature of the power battery is in the temperat...
Embodiment 3
[0047] Such as Figure 4 , the difference between this embodiment and Embodiment 1 is that: the thermal management object is a 5G base station; the thermal management object is characterized by an extremely uneven heat flux distribution, for example: the heat flux density in area A is small, and the heat flux density in area B is moderate 1. The heat flux density in area C is relatively high; multiple sub-liquid crystal elastomers of different types, structures and sizes are assembled and integrated in the liquid crystal elastomer. According to the difference in heat flux density of thermal management objects, A, B and C areas correspond to Figure 4 For different liquid crystal elastomers at a, b and c shown on the right, the aspect ratio of the liquid crystal elastomer molecules increases sequentially. Under the condition of the same liquid crystal molecule director orientation angle, the thermal conductivity of the liquid crystal elastomer at a, b and c also increases sequ...
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