Real-time refrigerating capacity calculation method of electric vehicle power battery liquid cooling system and control thereof

Abstract

The invention discloses a real-time refrigerating capacity calculation method of an electric vehicle power battery liquid cooling system and control thereof. The refrigerating capacity required by a battery refrigerating system at the current t moment is calculated through formulas (1) and (2), then the rotating speed of a compressor is adjusted according to the corresponding relation between therotating speed of the compressor and the refrigerating capacity, and the refrigerating capacity required by a battery at the current t moment is achieved. According to the refrigerating capacity method of the liquid cooling system provided in the invention, the factors such as the temperature of the battery, the heating power, the SOC of the battery and recession are actually considered, the obtained refrigerating capacity has better adaptability compared with a traditional method, and the temperature control capacity of the liquid cooling system can be remarkably enhanced. According to the refrigeration control system, the refrigerating capacity can be automatically adjusted according to the dynamic change of the thermal load of the battery in the running process of the electric vehicle,so that the liquid cooling system runs at the minimum power under the condition of meeting the heat dissipation requirement of the battery, the energy consumption of the liquid cooling system is remarkably reduced, and the endurance mileage of the electric vehicle is increased.

Description

Technical field [0001] The invention belongs to the technical field of electric vehicle power battery thermal management, and relates to a real-time cooling capacity calculation method and control for a liquid cooling system of an electric vehicle power battery. Background technique [0002] At present, lithium-ion batteries have become the most commonly used energy storage components for electric vehicles due to their excellent performance in terms of specific energy, lifespan, and cost, but their performance indicators are greatly affected by temperature. If the temperature is too low, lithium-ion batteries are prone to charging lithium and capacity (or power) shrinkage; if the temperature is too high, the internal decay process of the lithium-ion battery will be significantly accelerated, and it is also easy to cause safety problems such as thermal runaway. Therefore, the temperature during the service of electric vehicle power lithium-ion batteries should be strictly controll...

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Problems solved by technology

[0006] In order to solve the deficiencies in the prior art, the present invention provides a method for calculating the real-time cooling capacity of the electric vehicle power battery liquid cooling system and its control, which overcomes the real-time cooling problem of the electric vehicle liquid cooling system caused by the inaccurate calculation of the cooling capacity in the prior art. Poor adaptability between control and battery cooling load

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