Multi-point temperature correction method for battery management system

Abstract

In order to better control the battery temperature of the hybrid electric vehicle, the present invention provides a multi-point temperature correction method suitable for the battery management system of the hybrid electric vehicle from the perspective of infrared temperature detection. This method overcomes the problem that batteries are distributed in hybrid vehicles in the prior art, especially in four-wheel-drive hybrid vehicles in which batteries are distributed in a distributed manner. The fuel auxiliary drive unit does not have real-time performance on the temperature of the electric auxiliary drive unit. For the problem of reference value, through the numerical processing of infrared images, the correction parameters of the battery management system for battery control are obtained, and the stability and life of the battery work are improved.

Description

technical field [0001] The invention belongs to the technical field of automobile battery control, and in particular relates to a multi-point temperature correction method of a battery management system. Background technique [0002] At present, most of the battery management systems of electric vehicles are configured in the front or rear of the vehicle in a centralized structure. However, with the development of electric vehicles, people are increasingly aware of the advantages of hybrid vehicles in terms of energy saving and driving convenience compared with electric vehicles. For the driving system of the hybrid electric vehicle widely used at present, it is provided with a fuel-assisted driving unit (usually a gasoline engine or a diesel engine) and an electric-assisted driving unit (usually a storage battery), and the two cooperate to work together. Realize the driving of hybrid electric vehicles. [0003] When a hybrid vehicle accelerates or climbs a slope, it requi...

AI Technical Summary

Problems solved by technology

In the prior art, the temperature sensor is usually used in the correction process to collect the temperature of the battery management system and the surrounding temperature. However, the temperature sensor is instantaneous, and the temperature propagation has a certain delay, especially when the car is in some working conditions (such as just starting, long-term low gear and slow speed, etc.), the temperature of the fuel auxiliary drive unit may change slowly due to slow conduction, so that the temperature acquisition process of the fuel auxiliary drive unit needs to be continuously corrected by the ambient temperature, which makes the temperature sensor in The working time at the approximate temperature is longer, which will easily cause the sensitivity of the temperature sensor to decrease

In addition, the heat exchange between the temperature of the environment where the car, engine and battery are located and the temperature of the engine and battery takes a certain amount of time, and the temperature value detected by the temperature sensor, even after being corrected for the ambient temperature, is difficult to be compared with the battery management system. How to control the battery working state such as charging or discharging to establish an accurate and fast model

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