Electric vehicle battery pack thermal management system based on absorption-type refrigeration technology

Abstract

The invention provides an electric vehicle battery pack thermal management system based on an absorption-type refrigeration technology. The system comprises a battery box body, an absorption box, a condenser and a connecting pipeline, wherein the battery box body is internally and successively provided with a cooling plate, a battery monomer containing cavity and an evaporation box from bottom totop, a vapor pipeline is arranged at a position corresponding to the evaporation box on the battery box body, the other end of the vapor pipeline is connected with the condenser, and after subjected to the action of the condenser, incoming vapor is connected to the cooling plate through a cold flow pipeline; cooling liquid is arranged in the absorption box, one end of the absorption box is connected with a liquid outlet of the evaporation box through a first solution pipeline, and the other end is connected with a liquid inlet of the evaporation box through a second solution pipeline to form acirculation loop; by utilizing the heat dissipation action of the condenser and the evaporation action of the cooling plate, a cooling area is formed at the bottom of the battery monomer containing cavity, and by utilizing the evaporation action of the evaporation box and the heat dissipation action of the absorption box, heat dissipation areas are formed on the periphery and at the top of the battery monomer containing cavity. The system can greatly improve the heat dissipation efficiency.

Description

technical field [0001] The present disclosure relates to an electric vehicle battery pack thermal management system based on absorption refrigeration technology. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Driven by the energy crisis and environmental pollution problems, electric vehicle technology has developed rapidly. As the power source of electric vehicles, the power battery pack is closely related to the performance of the vehicle. In electric vehicles, battery cells are usually connected in series and parallel to form a battery pack to provide suitable voltage and sufficient power. During the operation or charging of electric vehicles, the chemical reaction inside the battery and the internal resistance of the battery itself cause the battery cells to heat up and cause the temperature of the battery pack to rise. The heat gen...

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Problems solved by technology

[0004] At present, the thermal management methods of electric vehicle battery packs mainly include air cooling, liquid cooling and phase change material cooling, among which the liquid cooling method has the advantages of high heat transfer coefficient, large heat capacity, fast cooling speed, remarkable cooling effect, good temperature consistency, and volume A series of advantages such as small size and flexible form have been widely used. For example, the Chinese utility model patent CN205882115U is named "a micro-channel battery thermal management system based on waste heat recovery". The excess heat is converted into cold energy, and the cold energy is introduced into the battery thermal management loop to control the temperature of the battery pack; however, this system needs to use the heat generated by the engine operation, so it is only applicable to plug-in and extended-range hybrid electric vehicles, and every Only two sides of a battery cell get heat dissipation, the heat dissipation effect is limited, and the temperature consistency is not high

Chinese invention patent CN102104181A, titled "Power battery thermal management system and automobile", this technology utilizes the first radiator for heat exchange with the air and the second radiator for heat exchange with the refrigerant of the air conditioning system to dissipate heat for the battery pack; but the system Many components need to consume electric energy during start-up and operation, which will inevitably affect the mileage of electric vehicles, and the system composition is relatively complicated, making actual installation difficult

[0005] In short, the existing battery thermal management systems have the problems of unsatisfactory heat dissipation and high energy consumption. Some battery thermal management systems also have the problems of narrow applicable range and complex system structure.

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