A new power battery pack system and its control method based on fuzzy pid control

Abstract

The invention discloses a novel power battery pack system based on fuzzy PID control and its control method; it includes a battery management system, a cooling liquid circulation main pipe, a cooling liquid primary / secondary branch pipe, a cooling liquid flow control valve, a primary / secondary Spherical liquid distribution hub, s-shaped flat heat exchange tube; the cooling liquid circulation main pipe is connected with the cooling liquid primary branch pipe through the primary spherical liquid distribution hub, and the cooling liquid primary branch pipe passes through the two The high-level spherical liquid distribution hub is connected to the secondary branch pipe of the coolant, and the end of each secondary branch pipe of the coolant is connected to two S-shaped flat heat exchange tubes placed on the outer surface of the battery core at an interval of 180°. A coolant flow control valve is installed on the stage branch pipe, which is driven by a stepping motor controlled by a fuzzy PID controller. The invention can control the power battery pack to always work in the optimum temperature range, and ensure the balance of the internal temperature of the battery pack, solve the shortcoming of the overall temperature imbalance of the battery pack, and improve the service life.

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] With the reduction of fossil energy in the world, all energy industries are facing transformation and upgrading. my country's auto industry is also facing the same problems. With the promotion of the new energy auto 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 the main energy storage component. The working state of the battery pack directly affects the performance of the electric vehicle. The temperature control technology of the power battery pack has a great impact on the working performance of t...

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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