Power battery heat management method based on working condition characteristics

Abstract

The invention provides a power battery heat management method based on working condition characteristics. Inside temperature of single batteries is estimated on the basis of a battery pack temperature sensor measurement value, and an estimation value is taken as a power battery pack heat management logic control parameter; the temperature measurement value, the SOC estimation value, ambient temperature and power battery real-time output working condition characteristics are taken as estimation model input, inside temperature of a power battery is predicted on the basis of a power battery temperature rise model, and a heat radiating instruction and heat radiating fan power selection are started in advance, so that the problem that current power battery heat radiating strategy control is unitary and delayed can be solved more reasonably.

Description

technical field [0001] The invention relates to the BMS system field of electric vehicle power batteries, in particular to a power battery heat management method based on working condition characteristics. Background technique [0002] The thermal management of the power battery pack can not only provide it with a reasonable operating temperature range and ensure its good working characteristics, but also the temperature rise characteristics can be used for auxiliary judgment of power battery failures. At present, the known power battery heat dissipation strategies are all based on open-loop or closed-loop control of the battery pack temperature. When the temperature in the battery pack is higher than the predetermined temperature, the heat dissipation device of the thermal management system is started, and the heat dissipation power is controlled according to the temperature. Size, and finally according to the feedback of temperature information, the closed-loop control of ...

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Problems solved by technology

However, through the battery temperature measurement with limited sensors arranged in the battery pack, due to the influence of sensor placement and different ambient temperatures on the heat transfer characteristics, not only are there large differences in the measured values ​​of each sensor, but the measured values ​​cannot accurately represent the internal temperature of the cell. , and at the same time, only using the temperature as a state quantity as the control logic threshold will lead to a hysteresis of the system heat dissipation control

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