A kind of series lithium battery management system and its management method for electric vehicle

Abstract

The invention provides an electric automobile serial lithium battery management system and a management method thereof. The management system comprises a mater controller module, battery pack control modules, a battery voltage detection module, a battery current detection module, a data storage module, a temperature control module, a display module, an alarm module, a power module and a power control module. The system and the management method can realize voltage and current acquisition and battery temperature control of a whole lithium battery system; each battery pack control module has a single battery voltage and temperature acquisition function and an equalization charge and discharge control function; and the system can identify other batteries with overlarge battery voltage differences in a battery pack and realize capacity consistency of single batteries through a charge and discharge control circuit, avoids overcharge or undercharge of the single batteries, realizes equalized charge and discharge of the lithium battery pack, estimates the service life of the single batteries and the coupling degree with the battery pack according to historical values of voltage, charge and discharge current and temperature parameters, and guarantees long-acting and safe operation of the lithium battery system.

Description

technical field [0001] The invention relates to the technical field of lithium battery power management, in particular to a series lithium battery management system for electric vehicles and a management method thereof. Background technique [0002] The use of single cells in series can increase the output voltage of the battery pack, and the use of parallel connections can obtain greater battery capacity. In the power battery pack for electric vehicles, increasing the output voltage of the battery pack can improve the system efficiency, thereby reducing the total cost of electric vehicles. Because the voltage of a single battery is low and the capacity is limited, the method of obtaining a high-voltage large-capacity battery pack by connecting several single batteries in series and parallel is widely used in automotive power batteries. The state of the single battery and the length of life affect the performance of the vehicle. During the use of the power battery of an el...

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Problems solved by technology

[0004] Chinese patent 201110421975.8 discloses a lithium battery charging power management method and system, which can determine whether to charge according to the lithium battery voltage detected when the input power is turned on, stop charging when the charging exceeds 10% of the rated voltage of the battery, and provide a charging system, which can avoid affecting the life of the battery due to frequent charging and long-term full capacity of the lithium battery

Lack of research on the estimation and prediction of battery life; lack of research on the control of power supply to various parts of the battery management system; lack of research on the degree of matching of all cells in the entire battery pack

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