An online estimation method of lithium titanate battery capacity

Abstract

The present invention relates to a lithium titanate battery capacity on-line estimation method. The implementation process of the method is based entirely on the charging process of a battery system by a vehicle-mounted charging device, a lithium titanate battery to be tested is not required to be disconnected from a power supply loop in a railway vehicle or an additional discharging condition is not required be to set for the lithium titanate battery to be tested, and the capacity value of the lithium titanate battery to be tested can be effectively estimated online; and therefore, the maintenance cost of the battery system for the rail vehicle can be effectively decreased, a theoretical basis is provided for energy management strategies in the operation process of lithium titanate batteries for rail transit; and the energy utilization efficiency of the overall vehicle can be improved.

Description

technical field [0001] The invention relates to the battery management field of rail transit vehicles, in particular to a method for estimating the capacity of a lithium titanate battery, especially a method for estimating the capacity of a lithium titanate battery for rail transit. Background technique [0002] Lead-acid batteries and nickel-cadmium batteries are generally used as battery power sources on traditional subways, light rails, locomotives and other rail vehicles. These two types of batteries are prone to heavy metal pollution during production, use and recycling, which is harmful to the ecological environment and human health. . Due to the shortcomings in energy density and cycle performance, the use of these two types of batteries also increases the complexity of vehicle maintenance. Compared with the above two batteries, lithium-ion batteries, especially lithium titanate batteries, have small size, light weight, high energy density, no pollution, no memory ef...

AI Technical Summary

Problems solved by technology

[0003] With the accumulation of use time, especially under the condition of high temperature operation, the physical and chemical characteristics of the battery itself will change, and eventually cause the battery capacity to decline

In order to ensure the reliable operation of the battery system, the offline capacity test of the battery system is usually carried out periodically, the battery system is disconnected from the power supply circuit in the rail vehicle, and then the battery capacity is tested by the constant current discharge method, although this method guarantees Accuracy of measurement results, but time-consuming and complex operations

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