Method for measuring SOC value of battery of hybrid vehicle
A measurement method, -SOC technology, applied in the measurement field of plug-in hybrid electric vehicle battery SOC value, can solve the problems of large current integration error, increased cost of current sampling devices, and unfavorable control strategy management of hybrid electric vehicles. , to achieve the effect of easy correspondence, precision and high precision
Active Publication Date: 2010-01-27
BYD CO LTD
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Problems solved by technology
Therefore, the measurement deviation of the current sampling device is 1000A × 0.1% = 1A, then the current integration error in the charging process is 1 / 5 = 20%, such a current integration error is too large, and the battery capacity obtained by this method is not conducive to Hybrid electric vehicle realizes the vehicle control strategy and the management of the battery by the battery management system
To reduce the error, you can use a high-precision current sampling device, but improving the accuracy will greatly increase the cost of the current sampling device
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[0035] This embodiment is used to illustrate the method for measuring the SOC value of a hybrid electric vehicle battery according to the present invention.
[0036] 100 battery samples were randomly selected from the 1000 lithium batteries of FL60A produced by BYD Co., Ltd., the rated capacity of the battery is 60AH (Ampere·Hour), the maximum voltage is 4.15V, and a Hiki 3193 power meter is used. Perform the above-mentioned steps of obtaining the corresponding relationship between voltage and SOC value for these battery samples, wherein the charging current is 5A, and the number of sampling points is 100, and finally obtain the corresponding relationship between voltage and SOC value of this type of battery, as shown in image 3 the curve shown. Randomly select a battery from 100 battery samples, and now discharge the power of the battery, and then charge the battery with the above-mentioned 5A current, measure the different voltages of the battery during the charging process...
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The invention discloses a method for measuring an SOC value of a battery of a hybrid vehicle, which comprises that: when the battery is in a discharge state, the SOC value is equal to an initial SOC value minus a percent of consumed electric quantity to rated capacity of the battery, and the consumed electric quantity is measured by a current integral method; and the method is characterized in that: when the battery is charged, the voltage of the battery is measured; and the SOC value in the current state is obtained according to the voltage and a preset voltage-SOC correspondence, and is used as the initial SOC value. Compared with the current integral method, the method can obtain the SOC value of the battery with higher precision in the charge state of the battery.
Description
technical field [0001] The invention relates to a method for measuring the SOC value of a battery of a hybrid electric vehicle, more particularly, to a method for measuring the SOC value of a battery of a plug-in hybrid electric vehicle. Background technique [0002] As the main or auxiliary power source of electric vehicles and hybrid vehicles, the battery pack is a key component of electric vehicles and hybrid vehicles. How to use the battery reasonably, make full use of the energy in the battery, and prolong the service life of the battery are the problems that must be solved for the further development of electric vehicles and hybrid vehicles. [0003] The battery state of charge (SOC) is used to describe the remaining power of the battery. It is an important parameter during the use of the battery. It is not only related to the estimation of the mileage of the car, but also related to the safety of the power battery. Traditional hybrid vehicles use the current integrat...
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IPC IPC(8): G01R31/36
Inventor 尹韶文宋峰张建华
Owner BYD CO LTD