A management method for an electric vehicle battery management system

Abstract

The invention relates to the field of batteries, and discloses an electric vehicle battery management system which comprises a battery compartment and a power supply management module, wherein the battery compartment comprises a compartment body and a battery pack arranged inside the compartment; the power supply management module comprises a controller, a charging device, as well as a heating device and a temperature sensor arranged in the battery compartment; the temperature sensor is used for transmitting a detected temperature signal to the controller; the controller is used for controlling the charging device to supply power to the heating device, controlling the charging device to charge the battery pack, or controlling the battery pack to supply power to the heating device. The invention further provides a management method based on the electric vehicle battery management system. The electric vehicle battery management system effectively controls the battery temperature of an electric vehicle at charging, travelling and parking stages, so that the battery pack can achieve good charging performance and discharging performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a management method for an electric vehicle battery management system. Background technique [0002] Temperature is one of the most important control parameters in the power supply system of electric vehicles. Temperature has a great influence on battery performance, including internal resistance, charging performance, discharging performance, safety and life of the battery. Among them, the impact of temperature on charging performance is directly reflected in the charging capacity, especially in the severe cold winter, when the temperature is zero or below zero, the battery charging capacity of electric vehicles can only reach 60% or even the standard charging capacity at room temperature. Lower, which seriously affects the number of mileage on a single charge. [0003] In the prior art, although a heating device is added in the battery compartment, the technical solution of simultaneo...

AI Technical Summary

Problems solved by technology

Among them, the impact of temperature on charging performance is directly reflected in the charging capacity, especially in the severe cold winter, when the temperature is zero or below zero, the battery charging capacity of electric vehicles can only reach 60% or even the standard charging capacity at room temperature. Lower, seriously affecting the number of miles driven on a single charge

[0003] In the prior art, although a heating device is added in the battery compartment, the technical solution of simultaneous heating and charging is usually adopted, or a single heating temperature is set, which fails to achieve the purpose of intelligently controlling the temperature of the battery compartment. And charging the electric vehicle battery when it is not higher than 0 ℃ may damage the battery; after the charging is completed or in the parked state, the battery is naturally cooled to a very low temperature, and the low temperature seriously affects the electric vehicle at the beginning of driving Battery discharge performance: battery internal resistance increases, electrochemical reaction speed slows down, polarization internal resistance increases rapidly, battery discharge capacity and discharge platform decrease, affecting battery power and energy output

[0004] In addition, high temperature also has a great impact on the battery performance of electric vehicles. For different types of lithium batteries, they can withstand different high temperature limits. If the temperature is too high, it will cause serious degradation of battery performance and poor stability. Lithium battery decomposes, emits a lot of heat and explodes

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