Battery pack thermal management system based on a flat heat pipe and operation method thereof

Abstract

The invention relates to the field of thermal management of power batteries, and discloses a battery pack thermal management system based on a flat heat pipe. The system comprises a battery pack, a flat heat pipe, U-shaped graphite sheets and heat exchange plates; the battery pack comprises a plurality of square battery cells, and the U-shaped graphite sheets are in one-to-one correspondence withthe battery cells; the U-shaped graphite sheet at least coat the two opposite sides of the battery cells to form battery units which are attached to one another in order to form a battery module; theheat exchange plates are arranged in order at intervals, the battery module is arranged between the adjacent heat exchange plates in the length direction of the battery module, and the flat heat pipeis located between the battery module and the heat exchange plates. The present invention further discloses an operation method based on the battery pack thermal management system based on the flat heat pipe. The system is simple and compact in structure and small in occupied area, can effectively improve the uniformity of the temperature in the battery pack while perform efficient heat dissipation / heating of the battery pack.

Description

technical field [0001] The invention relates to the field of power battery thermal management, in particular to a battery pack thermal management system based on a flat heat pipe and a working method thereof. Background technique [0002] As the main power source of electric vehicles, the parameters and performance of batteries directly affect the power, safety and economy of electric vehicles. Heat will be generated during battery work, which will increase the temperature of the battery, resulting in changes in battery voltage and thermal runaway; in cold winter areas, the battery temperature is too low will reduce the battery capacity, power and charge and discharge efficiency, which will reduce the mileage and battery life of electric vehicles. The maximum speed is greatly reduced. The uneven temperature of the battery pack will lead to uneven discharge of the battery pack, and the local temperature difference of the single battery will even cause pressure difference and...

AI Technical Summary

Problems solved by technology

[0003] Contacting the heat pipe or cold water pipe with the battery is used as a common heat dissipation method for battery thermal management to absorb the heat generated by the battery, which makes the heat exchange area extremely limited, the heat exchange is concentrated, and the temperature distribution inside the single battery is uneven.

When heating the battery, there is also a phenomenon that the temperature difference increases due to the concentrated heating

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