Traction battery power control method, device, system and vehicle

Abstract

The invention belongs to the technical field of vehicles, and specifically provides a power battery control method, device, system and vehicle, aiming to solve the problem that the actual power of the whole vehicle exceeds the rated power of the battery in the prior art, which leads to long-term over-discharge of the power of the battery pack and affects the power of the battery pack. The question of longevity. For this purpose, the power control method of the power battery provided by the present invention includes obtaining the first discharge power value of the power battery according to the voltage and discharge current of the power battery; obtaining the second discharge power of the power battery according to the adjustment result of the long-term corrected power of the power battery value, and select the smaller value of the two as the discharge power; adjust the discharge power according to the power deviation between the discharge power and the vehicle power demand value of the vehicle where the power battery is located. Based on the above steps, the method provided by the present invention has the beneficial effects of realizing the power over-discharge protection of the power battery and prolonging the service life of the battery.

Description

technical field [0001] The invention belongs to the technical field of vehicles, and in particular relates to a method, device, system and vehicle for power control of a power battery. Background technique [0002] For pure electric vehicles or hybrid vehicles, under the condition of motor drive or power generation, the battery is used as the power source to output or recycle electric energy. The battery management system collects battery parameters, monitors the battery status, and controls the charging and discharging power of the battery to achieve the purpose of protecting and limiting the working status of the battery. [0003] The power battery is composed of a series of single cells connected in series or in parallel. However, there are differences in parameters such as battery pack capacity and internal resistance due to assembly errors and production dispersion during mass production and assembly of battery packs, and Continuous fatigue and aging of the battery pac...

AI Technical Summary

Problems solved by technology

[0003] The power battery is composed of a series of single cells connected in series or in parallel. However, there are differences in parameters such as battery pack capacity and internal resistance due to assembly errors and production dispersion during mass production and assembly of battery packs, and Continuous fatigue and aging of the battery pack during use will cause the available energy of the battery pack to decrease

At the same time, the complexity of driving conditions often causes the actual power of the vehicle to exceed the rated power of the battery. The battery pack works under this condition, which will lead to long-term over-discharge of the battery pack power and affect the life of the battery pack.

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