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Fixed line electric automobile power battery residual electric quantity estimation method

A technology for electric vehicles and remaining power, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of not being able to get a large number of applications, corresponding errors, and large estimation errors, so as to eliminate the source of errors and the estimation method is simple , the effect of accurate estimation results

Active Publication Date: 2016-09-21
HIGER
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Problems solved by technology

[0003] The original method of estimating SOC is the open circuit voltage method OCV, but this method needs to be static for a long time, and the time-integrated method estimates the power, so between power and capacity The corresponding error will occur again
The popular Kalman filter method and fuzzy neural network method, due to the hardware conditions of the battery management system and the maturity of the algorithm itself, have not yet been widely used, so the current SOC estimation error is very large

Method used

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  • Fixed line electric automobile power battery residual electric quantity estimation method

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Embodiment

[0022] as shown in the picture 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 , working capacity C00 Calibration, since the routes of electric buses such as buses and commuter buses are fixed and the working conditions are stable, the capacity of working conditions can be calibrated with experimental vehicles C00 with rated capacity C0 Relationship. K00= （ C00 / C0 ) is called the service factor.

[0024] , working condition mileage M10n and operating capacity C00 Calibration of change. Due to the fixed routes and stable working conditions of electric buses such as buses and company commuter buses, the experimental vehicles can be used to calibrate each 10%M10n Capacity variation with working conditions C10n corresponding relationship.

[0025] , battery health status SOH Calibration method, due to the fixed 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 Applications(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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