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A Method for Estimating the Remaining Power of Traction Batteries of Fixed-line Electric Vehicles

A technology for electric vehicles and remaining power, applied in the measurement of electrical variables, measurement of electricity, and measurement devices, etc., can solve the problems of large SOC estimation errors, inability to obtain a large number of applications, errors in the correspondence between power and capacity, etc. The effect of eliminating sources of errors, accurate estimation results, and simple estimation methods

Active Publication Date: 2018-11-27
HIGER
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AI Technical Summary

Problems solved by technology

[0003] The original method of estimating SOC is the open-circuit voltage method OCV, but this method needs to be stationary for a long time, and the time-integrated method estimates the power, so there will be errors in the correspondence between power and capacity
However, the popular Kalman filter method and fuzzy neural network method cannot be widely used due to the hardware conditions of the battery management system and the maturity of the algorithm itself, so the current SOC estimation error is very large.

Method used

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  • A Method for Estimating the Remaining Power of Traction Batteries of Fixed-line Electric Vehicles

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Embodiment

[0022] Such as figure 1 As shown, the method for estimating the remaining power of the fixed-line electric vehicle power battery of the present invention includes:

[0023] 1. Calibration of working condition capacity C00. Since the routes of electric buses such as buses and commuter buses are fixed and the working conditions are stable, the relationship between working condition capacity C00 and rated capacity C0 can be calibrated with experimental vehicles. K00=(C00 / C0) is called the working condition coefficient.

[0024] 2. Calibration of the change of working condition mileage M10n and working condition capacity C00. Due to the fixed routes and stable working conditions of electric passenger cars such as buses and commuter buses, experimental vehicles can be used to calibrate the corresponding relationship between every 10% M10n and the capacity change C10n of working conditions.

[0025] 3. SOH calibration method for battery health status. Since the routes of electric ...

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Abstract

The invention discloses a fixed line electric automobile power battery residual electric quantity estimation method. The method comprises the following steps: calibrating a work condition capacity C00, and obtaining a work condition coefficient K00, wherein K00=C00 / C0, and C0 is a rated capacity; calibrating a certain work condition mileage and a consumed electric quantity, and obtaining a work condition capacity change amount C10n; calibrating a battery state of health (SOH), wherein SOH=(a rated total mileage-an accumulated driving mileage) / the rated total mileage; calculating a current-day available capacity C, wherein C=C0*K00*SOH; and accumulating a consumed battery capacity Cu=(sigma C10n) / SOH, calculating a residual state of charge (SOC), wherein SOC=(C-Cu) / C*100%. According to the invention, an error source can be effectively eliminated, the estimation method is simple, and the estimation result is accurate.

Description

technical field [0001] The invention belongs to the field of electric vehicle power battery management, and in particular relates to a method for estimating the remaining power of a fixed-line electric vehicle power battery. Background technique [0002] An electric vehicle is a means of transportation with an electric motor as the power device and a battery as the energy storage device. The development of electric vehicles is an emerging strategic industry that countries have vigorously developed after the energy crisis and financial crisis. Therefore, battery management is extremely important. The remaining capacity of the battery pack (SOC) is an important parameter of the battery management system, the most important reference for battery usage route planning, and the basis for power management in battery management. [0003] The original method of estimating SOC is the open-circuit voltage method OCV, but this method needs to be stationary for a long time, and the tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
CPCG01R31/382
Inventor 王世强陈政佐唐素亚方兰兰李浩晨张建利
Owner HIGER
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