An Online SoC Estimation Method with Reduced Prior Test Information
A priori testing, ampere-hour method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as incompatibility, achieve high precision, reduce complexity and cost of use, and ensure high precision requirements. Effect
Active Publication Date: 2019-09-20
XI AN JIAOTONG UNIV
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[0007] To sum up, in order to obtain accurate values of the state of charge of the battery, the commonly used estimation methods now need to measure specific experimental data under experimental conditions, which need to be carried out offline, and are not suitable for actual use.
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[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0039] like figure 1 As shown, an online SOC estimation method with reduced prior test information includes the following steps:
[0040] The first step is to obtain the basic parameters of the battery, which include the capacity and cut-off voltage of the battery;
[0041] The second step is to obtain the initial SOC of the battery. The initial SOC acquisition method is: the initial SOC of the new battery; or the initial SOC obtained by fully charging the battery before using the battery for the first time;
[0042] The third step is to measure the voltage and current of the battery in actual use;
[0043] In the fourth step, according to the given initial SOC of the battery and the measured current, the ampere-hour method SOC of the battery is calculated by the ampere-hour integration method, that is, the SOC CCM ;
[0044] In the fifth step, th...
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The invention discloses an online SOC estimation method for reducing prior test information. The method herein includes the following steps: firstly obtaining basic parameters of a battery, acquiring the initial SOC of the battery, selecting a short time, measuring the voltage and current of the battery in usage, computing the SOC of the battery by using the AH integration method, also a data recording apparatus performing recording; selecting recorded data, using the sectioning technology to apply the selected data to an online identification algorithm to compute unknown parameters of a battery model, and acquiring corresponding parameters which are replaced to the battery model so as to determine whether the acquired parameters are sufficiently accurate, if the parameters are sufficiently accurate, saving the group of parameters so as to further estimate SOC in the model; if the parameters are not sufficiently accurate, repeating the online identification process until the sectioning parameter is sufficiently accurate; acquiring the parameters of the battery model, applying the parameters to the SOC estimation method which is based on the model to correct the SOC, and real-time estimating the SOC of the battery in combination with the AH integration method and based on the model. According to the invention, the method herein can obtain better estimation result.
Description
technical field [0001] The invention belongs to the technical field of battery SOC estimation, and particularly proposes an online SOC estimation method that reduces prior test information. Background technique [0002] Lithium-ion batteries are currently considered the only viable solution for electric vehicles (BEV, HEV, PHEV) and are gaining more and more attention. However, as a complex electrochemical system with strong nonlinearity, lithium-ion batteries are very sensitive to overcharge and overdischarge. If overcharging or overdischarging occurs, the cycle life of the battery may drop sharply, and the battery may catch fire or even explode. The battery management system (BMS) should take measures to avoid these situations and ensure the safety of electric vehicles. [0003] The state of charge (SOC), which is defined as the ratio of the remaining capacity to the rated capacity, is considered to be one of the key parameters that can be used to solve the above-mention...
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IPC IPC(8): G01R31/3842
Inventor 徐俊赵云飞梅雪松
Owner XI AN JIAOTONG UNIV