Combined cooling method and system for battery pack and charging pile of electric vehicle

Abstract

The invention belongs to the technical field of rapid charging and cooling of electric vehicles, particularly relates to a combined cooling method and system for a battery pack and a charging pile of an electric vehicle, and aims to solve the problems that in a rapid charging scene, the heat dissipation power of a traditional battery pack and charging pile heat dissipation mode cannot meet the requirement, and a charging interface lacks effective cooling. The method comprises the following steps of: starting self-circulation cooling in a rapid charging state; calculating total heat production, and acquiring a condenser air speed or condensate water flow speed at the current moment; if the system cooling is in a steady state within the time delta t, maintaining self-circulation, otherwise, starting a circulating pump and enabling the circulating pump to operate at a preset rotating speed n, and entering a forced circulation mode; if the system cooling is in a steady state within the time delta t, maintaining a rotating speed of the circulating pump, otherwise, adjusting the rotating speed increment of the circulating pump; and repeatedly executing the steps until the electric vehicle stops rapid charging, and turning off a condenser fan and the circulating pump. The charging pile and the battery pack are cooled at the same time, cost and system energy consumption are reduced, and charging safety and the cooling effect are improved.

Description

technical field [0001] The invention belongs to the technical field of rapid charging and cooling of electric vehicles, and in particular relates to a combined cooling method and system for electric vehicle battery packs and charging piles. Background technique [0002] Under the dual promotion of energy security and green transportation, electric vehicles have developed rapidly in recent years. Lithium-ion batteries have become the main power source of electric vehicles due to their high energy density, high power density, and long cycle life. However, due to the dependence of battery parameters on usage conditions, lithium-ion batteries still face some difficulties and challenges in practical applications. Compared with traditional fuel vehicles, the charging time of electric vehicles is greatly extended, and the battery pack even takes 8 to 10 hours to be fully charged under slow charging conditions. The key to solving charging time anxiety is the popularization and app...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems in the prior art, that is, the heat dissipation power of the traditional battery pack and charging pile heat dissipation method in the fast charging scene cannot meet the demand, and the charging interface lacks effective cooling problem, the present invention provides a combined cooling method for electric vehicle battery packs and charging piles, the combined cooling method includes:

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