Novel power battery pack system based on fuzzy PID control and control method thereof

Abstract

The invention discloses a novel power battery pack system based on fuzzy PID control and a control method thereof. The system comprises a battery management system, a cooling liquid circulating main pipeline, cooling liquid primary/secondary branch pipes, cooling liquid flow control valves, primary/secondary spherical liquid distribution pivots and s-shaped flat heat exchange pipes. The cooling liquid circulating main pipeline is communicated with a cooling liquid primary branch pipe through a primary spherical liquid distribution pivot, and the cooling liquid primary branch pipe is connectedwith a cooling liquid secondary branch pipe through a secondary spherical liquid distribution pivot. The tail end of each cooling liquid secondary branch pipe is connected with two s-shaped flat heatexchange pipes which are arranged on the outer surface of the battery cell at an interval of 180 degrees, and a cooling liquid flow control valve is arranged on each cooling liquid primary branch pipeand is driven by a stepping motor controlled by a fuzzy PID controller. According to the invention, the power battery pack can be controlled to always work in the optimal temperature range; the balance of the internal temperature of the battery pack is ensured; the disadvantage of unbalanced overall temperature of the battery pack is solved; and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of temperature control of power battery packs of new energy electric vehicles, in particular to a novel power battery pack system based on fuzzy PID control and a control method thereof. Background technique [0002] As the world's fossil energy is decreasing day by day, all energy industries are facing transformation and upgrading. my country's automobile industry is also facing the same problem. With the promotion of the new energy automobile industry by the Chinese government, a series of policies have been introduced to encourage the development of the industry. my country's new energy vehicle industry has also achieved certain development. For electric vehicles, the battery pack is its main energy storage component, and the working status of the battery pack directly affects the performance of the electric vehicle, and the temperature control technology of the power battery pack has a great impact on the...

AI Technical Summary

Problems solved by technology

However, due to the problem of the flow channel structure in the existing liquid cooling system, the temperature of each battery cell will be unbalanced or the temperature difference between the cooling medium near the outlet and the battery core will decrease, and the heat dissipation will be lower than that near the inlet. As a result, the overall temperature of the battery pack is unbalanced, which adversely affects the normal operation of the battery pack, and limits the performance and service life of the battery pack.

Therefore, the object of the present invention is to provide a new type of power battery pack system and its control method based on fuzzy PID control, which solves the disadvantages of unbalanced overall temperature of the battery pack, poor performance and service life of the battery pack

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