Power battery cooling control method based on power battery cooling control system

Abstract

The invention discloses a power battery cooling control method based on a power battery cooling control system, relating to a cooling system control method. The method employs battery temperature difference comparison for controlling of battery cooling and temperature consistency, overcomes restrictions on temperature and space during external cooling control by a battery, greatly improves accuracy of battery temperature control, ensures consistency of internal resistance of individual cells, is capable of reducing temperature when the integral temperature of a battery pack is too high and further prolongs the service life of the battery.

Description

technical field [0001] The invention relates to a cooling system control method, in particular to a power battery cooling control method based on a power battery cooling control system. Background technique [0002] The power battery of pure electric vehicle is the core component of the car, and its performance will directly affect the performance of the whole vehicle. Lithium-ion power battery is a newly emerging battery in the 1990s. It has small size, specific energy and It has the advantages of high specific power, high voltage, long life, environmental protection and no pollution. However, lithium-ion power batteries are sensitive to temperature, and they exhibit different discharge performances at different temperatures; if there are many lithium-ion power batteries assembled together, due to the inconsistent internal resistance of each lithium-ion power battery, each There is a large difference in the discharge and charging performance of each single lithium-ion powe...

AI Technical Summary

Problems solved by technology

However, lithium-ion power batteries are sensitive to temperature, and they exhibit different discharge performances at different temperatures; if there are many lithium-ion power batteries assembled together, due to the inconsistent internal resistance of each lithium-ion power battery, each There is a large difference in the discharge and charging performance of the individual lithium-ion power batteries, which eventually leads to poor performance of the lithium-ion power battery assembly, and is finally reflected in the significant decline in the service life of the lithium-ion power battery assembly.

[0003] For the lithium-ion power battery assembly used in pure electric vehicles, due to the need for more lithium-ion power battery cells, and the limitation of the layout space, the uniformity of the flow field and the inconsistency of the internal resistance of the lithium-ion power battery cells, its own There is a problem of uneven temperature, which is prone to inaccurate temperature detection and failure

If only relying on the consistency of lithium-ion power battery cell assembly and battery pack structure design cannot finally solve the problem of heat dissipation and temperature consistency of lithium-ion power battery, it must be equipped with heat dissipation and its control system

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