Battery thermal management system and method

Abstract

A battery thermal management system and method are provided. The system includes a battery module, a heat pipe unit, a heating unit, a main cooling system and a sub cooling system; the heat pipe unitcomprises a plurality of heat pipes, wherein each heat pipe comprises a heat end of the heat pipe and a cold end of the heat pipe; an end face of the battery module is thermally coupled with a surfaceof the hot end of the heat pipe; the heating unit is thermally coupled with the surface of the heat pipe hot end facing away from the battery module; a cold end of the heat pipe is thermally coupledto the surfaces of the primary cooling system and the secondary cooling system, respectively. The invention can flexibly start one of the cooling systems according to the ambient temperature to realize cooling of the battery module, so as to save as much power as possible for cooling the battery, avoid the use of antifreeze in the whole thermal management system, minimize the power consumption ofthe circulating water pump or the refrigeration compressor, and minimize the power consumption of the new energy vehicle for cooling the battery module.

Description

technical field [0001] The present invention relates to the technical field of battery thermal management, in particular to a battery thermal management system and method. Background technique [0002] Power batteries represented by lithium-ion batteries have been widely used to provide power for new energy vehicles. At present, the industry generally believes that the optimal ambient temperature for lithium-ion batteries is 5-35°C, and lithium-ion power batteries operating in this temperature range can maintain high charge and discharge efficiency and achieve a long service life. [0003] However, in most parts of southern my country, the temperature of the power battery is often between 35 and 55°C when the power battery is charged at a high rate of more than 1C in summer, and when it is discharged while driving in high temperature weather. In most parts of northern my country, the ambient temperature in winter is often lower than 5°C. Therefore, a battery thermal manage...

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Problems solved by technology

Due to the large specific heat capacity of antifreeze, this method of heating the battery at low temperature either consumes a lot of power and does not save energy; or the temperature rise rate of the battery is relatively low;

[0007] 3. The pipes of the liquid cooling device form a relatively complex series-parallel circuit in the battery pack. These complex series-parallel circuits are difficult to maintain a good temperature uniformity of the battery

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