Battery power calibration method and device

Abstract

The embodiment of the invention provides a battery power calibration method and device. The method comprises the steps of obtaining corresponding discharge power of a target battery of a target vehicle under different parameter working conditions; carrying out a dynamic driving test on the target vehicle, and determining the maximum motor power corresponding to the motor of the target vehicle under different parameter working conditions; acquiring the corresponding current maximum motor power of the motor of the target vehicle under the current state of charge at the current environment temperature; determining a target temperature and a target state of charge based on a relationship between the current environment temperature and the current state of charge and a preset temperature standard parameter and a preset state of charge standard parameter; and calibrating the power of the target battery at the target temperature and the target charge state based on the current maximum motor power. Therefore, it can be guaranteed that the vehicle releases power to the maximum degree under any condition in real time, the dynamic property is enhanced, meanwhile, the phenomenon that power output is too large due to the precision error of the state of charge can be avoided, and it is guaranteed that the service life of a battery cell is not shortened due to excessive discharge.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a battery power calibration method and device. Background technique [0002] At present, electric vehicles are becoming more and more popular and gradually replacing fuel vehicles. Batteries are the power source of electric vehicles. During the production process of electric vehicles, the discharge power of batteries needs to be calibrated. The calibrated discharge power refers to the discharge power that can work safely and reliably when the battery has a certain remaining power at a certain temperature. [0003] Due to the limited performance of the ternary lithium battery at low temperature, it cannot maximize the discharge capacity as at normal temperature, resulting in the simultaneous attenuation of the power of the vehicle. If the power is unrestricted, it is easy to cause undervoltage failure of the battery cell, which will affect the life of the battery cell. The cur...

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Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a battery power calibration method and device to overcome the problem in the prior art that the battery power calibration method in a low temperature environment is difficult to balance battery power performance and battery life

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