Power battery temperature correction method and system, medium and equipment

Abstract

The invention relates to a power battery temperature correction method and system, a medium and equipment. The method comprises the steps of collecting busbar temperature, battery current and currentenvironment temperature in real time; when it is determined that a correction starting condition is met according to the busbar temperature and the battery current, acquiring a temperature correctionslope according to the current environment temperature, the current battery current, preset corresponding relations between different test conditions and the temperature rise rate, acquired through calculation under the test conditions, of the battery cell temperature; correcting the busbar temperature to the temperature increased according to the temperature correction slope from the moment whenthe correction starting condition is met to obtain a corrected temperature; and when it is determined that the correction quitting condition is met according to the busbar temperature and the correction temperature, ending temperature correction . According to the invention, the busbar temperature output by BMS can be prevented from jumping and shaking under the high-magnification application condition of the battery system; smooth and uniform change of the temperature along with time in the application process is ensured; and stable power output of a vehicle is further ensured.

Description

technical field [0001] The invention relates to the field of BMS battery management systems, in particular to a power battery temperature correction method, system, medium and equipment. Background technique [0002] The monitoring of battery temperature during the use of power batteries involves performance and safety, which is especially important for electric vehicles. At present, since the temperature acquisition device cannot be directly installed inside the battery, considering the structural design and production process, the battery module temperature acquisition device is usually installed on the module by pasting, welding, riveting, screwing, etc. on the busbar. In order to more accurately detect the internal temperature of the cell, the detection point is usually designed at the connection position between the bus bar and the cell. There are two problems in this temperature acquisition method. On the one hand, the bus bar is a conductive metal with a certain res...

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Problems solved by technology

There are two problems in this temperature acquisition method. On the one hand, the bus bar is a conductive metal with a certain resistance. When the battery power is low, the resistance heating can be ignored and will not significantly affect the accuracy of temperature acquisition. In the case of charging and discharging, the heat effect of the bus bar cannot be ignored, which will affect the accuracy of temperature acquisition; on the other hand, no matter what process is used to connect the bus bar to the battery, there will be different degrees of contact resistance. The thermal effect of resistance cannot be ignored, which will affect the accuracy of temperature acquisition

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