Method for estimating and revising state of charge (SOC) in battery management system of electric vehicle
A battery management system and electric vehicle technology, applied in electric vehicles, battery circuit devices, collectors, etc., can solve the problem of estimation errors such as battery charge and discharge capacity estimation, vehicle mileage estimation inaccuracy, etc., to eliminate the influence of errors Factors, the effect of improving the estimation accuracy
Active Publication Date: 2013-11-27
ZHENGZHOU YUTONG BUS CO LTD
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[0003] The purpose of the present invention is to solve the problem of inaccurate estimation of battery charge and discharge capacity and vehicle mileage estimation caused by the large estimation error of the existing battery pack, and propose a SOC estimation correction in the battery management system of electric vehicles method
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[0015] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings, and the correction method adopted for inaccurate SOC estimation caused by temperature factors, battery aging factors, and current integration cumulative error factors will be introduced in detail. This estimation correction method estimates and corrects the SOC according to the impact of each factor on the SOC, and mainly includes the following steps:
[0016] Correction of the influence of temperature factors on SOC estimation: Assuming a battery pack with a rated capacity of 200AH, at a certain moment, the SOC calculated by the battery management system based on the rated capacity is 50%, and the effective capacity that can be released at a temperature of -10°C is 160AH, then the correction factor of SOC at this temperature is A=(AH1-AH2) / AH1=(200-160) / 200=0.2, then the corrected SOC at this temperature (repair)=(SOC-A) / (1-A)=(0.5-0.2) / (...
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The invention belongs to the field of power battery management of electric vehicles and in particular relates to a method for estimating and revising the state of charge (SOC) in a battery management system of an electric vehicle. The method mainly comprises the following steps of: firstly, calculating the current SOC of a battery; and secondly, revising the SOC for influence of battery temperature, battery ageing and a current integration accumulated error on the SOC, wherein for the influence of the battery temperature and the battery ageing on the SOC, the SOC of the battery is revised by calculating revising factors of the battery temperature and the battery ageing and using the revising factors, and for the influence of the current integration accumulated error on the SOC, revising of the SOC is determined by judging discharging current and duration time. The method has the advantages that: by revising the SOC for the influence of the battery temperature, the battery ageing and the current integration accumulated error on the SOC, influencing factors of the error can be quite conveniently eliminated, and the revising accuracy of the SOC is improved.
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 and correcting an SOC of an electric vehicle battery management system. Background technique [0002] Among the new energy vehicles, the most promising electric vehicle is an electric vehicle powered by electricity and driven by an electric motor. The power source of electric vehicles mainly comes from batteries. The development of the electric vehicle industry is also a strategic emerging industry that countries compete for after the financial crisis. Power batteries and their management systems are key components of electric vehicles. The state of charge (SOC) of the battery pack is an important parameter in the battery management system. It is a direct reflection of the battery power. The basis provides the basis for the maximum power output and input of the battery, because overcharging and overdischarging of the ...
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IPC IPC(8): H02J7/00
Inventor 游祥龙秦兆东李龙周雪松路丹花
Owner ZHENGZHOU YUTONG BUS CO LTD