A method of rectifying SOC by using a charger
A charging machine and battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as single correction method and SOC estimated value cannot be corrected in time and effectively, so as to improve safety and reliability, improve power utilization rate, Effect of extending battery life
Active Publication Date: 2020-09-18
深圳市电精灵销售有限公司
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Problems solved by technology
The correction method is single and may not meet the above correction conditions in the actual use process, resulting in the estimated value of SOC not being corrected in a timely and effective manner
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[0024] Reference attached figure 1 to attach figure 2 The specific embodiment of the present invention is introduced.
[0025] like figure 2 As shown, a method of using a charger to correct the SOC is used to model the equivalent circuit of the lithium battery, and the second-order RC circuit is used to establish the equivalent circuit model. The equivalent circuit model includes a voltage source Voc in series, a Internal resistance R and two RC parallel loops with different time constants, the two RC parallel loops are the first RC unit composed of Rs and Cs in parallel, the second RC unit composed of Rp and Cp in parallel, the first RC unit and The second RC unit is also connected in series;
[0026] Contains the following steps,
[0027] S1. Use the charger to charge the lithium battery of the electric vehicle with a constant current for a period of time, then stop charging and let it stand for a period of time until the battery voltage is stable, where t0 is the time...
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The invention discloses a method for correcting SOC (states of capacity) by the aid of chargers. The method includes modeling equivalent circuits for lithium batteries; building equivalent circuit models by the aid of second-order RC (resistor capacitor) circuits; combining the equivalent circuit models with the chargers; acquiring accurate voltage response curves after charge is completed; identifying battery parameters of the equivalent circuit models according to processes for fitting secondary index item coefficient curves; computing open circuit voltages OCV of the batteries; acquiring true values of the SOC according to OCV-SOC curves; eliminating accumulated errors; correcting estimation values of the SOC. The method has the advantages that the estimation values of the SOC of the batteries can be corrected by the aid of the combined chargers whenever the batteries are charged, accordingly, influence due to the accumulated errors can be eliminated, the SOC estimation precision can be improved, and the method is simple and reliable, is easy to implement and has important significance on improving the safety and the reliability of the batteries, increasing the utilization rate of electric energy and prolonging the service lives of the batteries.
Description
technical field [0001] The invention relates to the field of power battery management, in particular to a method for correcting SOC by using a charger. Background technique [0002] In recent years, with the deteriorating air quality and the scarcity of oil resources, new energy vehicles, especially pure electric vehicles, have become the development hotspots of major automobile companies in the world today. As a key component of electric vehicles, the power battery pack is used to directly reflect the remaining power of the battery. It is an important basis for the vehicle control system to formulate an optimal energy management strategy. Accurate estimation of the SOC value of the power battery is important for improving battery safety. It is of great significance to improve reliability, improve battery energy utilization, and prolong battery life. At present, the commonly used SOC estimation methods mainly include open circuit voltage method, ampere-hour integration meth...
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IPC IPC(8): G01R31/367
CPCG01R31/3648G01R31/367
Inventor 刘厚德康龙云王书彪郭向伟辛创张诚刘坤富饶华兵
Owner 深圳市电精灵销售有限公司